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Originally a public domain film from the US Navy, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).
https://en.wikipedia.org/wiki/History_of_the_aircraft_carrier
Wikipedia license: http://creativecommons.org/licenses/by-sa/3.0/
Aircraft carriers are warships that evolved from balloon-carrying wooden vessels into nuclear-powered vessels carrying scores of fixed- and rotary-wing aircraft. Since their introduction they have allowed naval forces to project air power great distances without having to depend on local bases for staging aircraft operations.
Balloon carriers were the first ships to deploy manned aircraft, used during the 19th and early 20th century, mainly for observation purposes. The advent of fixed-wing aircraft in 1903 was followed in 1910 by the first flight from the deck of a US Navy cruiser. Seaplanes and seaplane tender support ships, such as HMS Engadine, followed. The development of flat top vessels produced the first large fleet ships. This evolution was well underway by the early to mid-1920s, resulting in the commissioning of ships such as Hōshō (1922), HMS Hermes (1924),[1] Béarn (1927), and the Lexington-class aircraft carriers (1927).
Most early aircraft carriers were conversions of ships that were laid down (or had even served) as different ship types: cargo ships, cruisers, battlecruisers, or battleships. During the 1920s, several navies started ordering and building aircraft carriers that were specifically designed as such. This allowed the design to be specialized to their future role, and resulted in superior ships. During the Second World War, these ships would become the backbone of the carrier forces of the US, British, and Japanese navies, known as fleet carriers.
World War II saw the first large-scale use of aircraft carriers and induced further refinement of their launch and recovery cycle leading to several design variants. The USA built small escort carriers, such as USS Bogue, as a stop-gap measure to provide air support for convoys and amphibious invasions. Subsequent light aircraft carriers, such as USS Independence, represented a larger, more "militarized" version of the escort carrier concept. Although the light carriers usually carried the same size air groups as escort carriers, they had the advantage of higher speed as they had been converted from cruisers under construction...
2021-03-05 16:29:35 +0000 UTC
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'Combination bus and railroad car connect small towns with railroad... Bus effortlessly converting from driving on street to railroad tracks...
Title Card: "Jackson, Michigan" superimposed over bus driving on city street.
Bus turning (from street) onto railroad tracks. ECU hand operating control levers. CU guide wheels lowering to railroad tracks (from bus chassis -- beside tire); wheels rolling. Bus crossing railroad trestle (tracking shot); railroad tracks (view to horizon). Bus driver's and passenger's backs (road visible through windshield). ECU rolling wheels. Train rolling along railroad track (tracking shot); 2 cars rapidly approach railroad crossing; train stops, allowing cars to cross tracks. Train rolling along tracks toward station (tracking shot). ECU hand operating control levers. CU (front of) bus turning off of railroad tracks (Chevrolet logo visible); retracting guide wheels. Man loading steel milk container into cargo compartment of bus ("Evans Auto-Railer"; Chevrolet logo visible); closing door; picking up small travel bag; walking o.s. Bus driver boarding bus.'
Originally a public domain film from the National Archives or Library of Congress Prelinger Archives, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).
https://www.macsmotorcitygarage.com/for-both-road-and-rail-the-evans-auto-railer/
...the Evans Products Company was a diverse enterprise that manufactured everything from railroad cars to tricycles...
One development aggressively promoted by the company in the mid-1930s was a passenger bus called the Auto-Railer, which was designed to travel on the highway or on standard-gauge railroad track. The product was a natural progression for Evans, which also produced a utility truck along the same lines, as well as the drop-down auxiliary chassis setups to convert road vehicles to railroad travel (often known as hi-rail equipment)...
Underneath the futuristic, streamlined body, the Auto-Railer passenger bus was essentially a standard Chevrolet truck chassis with a six-cylinder engine in the front and tandem-axle suspension in the rear. The reasoning behind the hybrid road/rail vehicle is self-evident. In areas that could not support both railway and highway passenger service, the Auto-Railer could serve both functions. While the Auto-Railer was not produced in large numbers, evidently, the company did enjoy some success with the product, with several transport lines on the East Coast putting them to use...
2021-03-04 18:57:29 +0000 UTC
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Originally a public domain film from the National Archives, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).
https://en.wikipedia.org/wiki/East_Berlin
Wikipedia license: http://creativecommons.org/licenses/by-sa/3.0/
East Berlin was the de facto capital city of the German Democratic Republic from 1949 to 1990. Formally, it was the Soviet sector of Berlin, established in 1945. The American, British, and French sectors were known as West Berlin. From 13 August 1961 until 9 November 1989, East Berlin was separated from West Berlin by the Berlin Wall. The Western Allied powers did not recognize East Berlin as the GDR's capital, nor the GDR's authority to govern East Berlin. On 3 October 1990, the day Germany was officially reunified, East and West Berlin formally reunited as the city of Berlin...
Overview
With the London Protocol of 1944 signed on 12 September 1944, the United States, the United Kingdom and the Soviet Union decided to divide Germany into three occupation zones and to establish a special area of Berlin, which was occupied by the three Allied Forces together. In May 1945, the Soviet Union installed a city government for the whole city that was called "Magistrate of Greater Berlin", which existed until 1947. After the war, the Allied Forces initially administered the city together within the Allied Kommandatura, which served as the governing body of the city. However, in 1948 the Soviet representative left the Kommandatura and the common administration broke apart during the following months. In the Soviet sector, a separate city government was established, which continued to call itself "Magistrate of Greater Berlin".
When the German Democratic Republic was established in 1949, it immediately claimed East Berlin as its capital—a claim that was recognised by all communist countries. Nevertheless, its representatives to the People's Chamber were not directly elected and did not have full voting rights until 1981.
In June 1948, all railways and roads leading to West Berlin were blocked, and East Berliners were not allowed to emigrate. Nevertheless, more than 1,000 East Germans were escaping to West Berlin each day by 1960, caused by the strains on the East German economy from war reparations owed to the Soviet Union, massive destruction of industry, and lack of assistance from the Marshall Plan. In August 1961, the East German Government tried to stop the population exodus by enclosing West Berlin within the Berlin Wall. It was very dangerous for fleeing residents to cross because armed soldiers were trained to shoot illegal migrants.
East Germany was a socialist republic, but there was not complete economic equality. Privileges such as prestigious apartments and good schooling were given to members of the ruling party and their families. Eventually, Christian churches were allowed to operate without restraint after years of harassment by authorities. In the 1970s, wages of East Berliners rose and working hours fell.
The Soviet Union and the Communist bloc recognised East Berlin as the GDR’s capital. However, Western Allies (the US, UK, and France) never formally acknowledged the authority of the East German government to govern East Berlin. Official Allied protocol recognised only the authority of the Soviet Union in East Berlin in accordance with the occupation status of Berlin as a whole. The United States Command Berlin, for example, published detailed instructions for U.S. military and civilian personnel wishing to visit East Berlin. In fact, the three Western commandants regularly protested against the presence of the East German National People's Army (NVA) in East Berlin, particularly on the occasion of military parades. Nevertheless, the three Western Allies eventually established embassies in East Berlin in the 1970s, although they never recognised it as the capital of East Germany. Treaties instead used terms such as "seat of government."
On 3 October 1990, East and West Germany and East and West Berlin were reunited...
2021-03-03 18:03:59 +0000 UTC
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Originally a public domain film from the National Archives, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).
https://en.wikipedia.org/wiki/Type_95_Ha-Go_light_tank
Wikipedia license: http://creativecommons.org/licenses/by-sa/3.0/
The Type 95 Ha-Gō (九五式軽戦車 ハ号, kyūgo-shiki kei-sensha Ha-Gō, also known as the Ke-Go) was a light tank used by the Empire of Japan during the Second Sino-Japanese War, at Nomonhan against the Soviet Union, and in the Second World War. It proved sufficient against infantry but, like the American M3 Stuart light tank, was not designed to combat other tanks. Approximately 2,300 were produced, making it the most numerous Japanese armoured fighting vehicle of the Second World War...
The Type 95 was a 7.4-ton vehicle with a complement of 3 crewmen: a commander, a hull machine gunner, and a driver. Only the commander was seated in the turret, hence he was responsible for observation, loading, aiming, firing the main gun, as well as decision-making and commanding the crew. The hand-operated turret was small and extremely cramped.
The primary armament of the most produced version was a Type 94 (1934) 37 mm tank gun (not to be confused with the Type 94 37 mm anti-tank gun introduced two years later) with a barrel length of 46.1 calibers. It elevated between −15 to +20 degrees. The tank carried two types of 37 mm ammunition, the high-explosive and armor-piercing. For the latter, muzzle velocity was 580 m/s (1,900 ft/s) and armor penetration was 36 mm (1.4 in) at a distance of 275 m (902 ft).
Secondary armament was originally two 6.5 mm Type 91 machine guns, but these were replaced with two 7.7 mm Type 97 light machine guns, one mounted in the hull front and the other in the back of the turret, facing to the rear right (that is, in the five-o-clock direction).
The most characteristic feature of the Type 95 tank was its simple suspension system. Army officer Tomio Hara designed the bell crank scissors system. This suspension system became standard on the majority of the subsequently designed Japanese tanks. For the Type 95, two paired bogie wheels per side were suspended on a single bell crank and connected to a coil spring mounted horizontally outside the hull. The tracks were driven through the front sprockets. There were two return wheels. The suspension had troubles early on, with a tendency to pitch on rough ground, and so it was modified with a brace to connect the pairs of bogies. Despite this, the tank continued to give its users a rough ride across any uneven ground. It was provided with an interior layer of asbestos padding separated from the hull with an air gap, to isolate the crew from the sun-heated armor plates, and to protect the crew from injury when the tank moved across rough terrain.
The Type 95 was fitted with a 120 hp (89.5 kW) Mitsubishi A6120VDe air-cooled 6-cylinder diesel engine. It was located in the rear compartment on the right side. The power unit gave it good mobility. Some tanks were fitted with two reflectors in the front of the vehicle for night operations...
Type 95 proved sufficient against opposing infantry in campaigns in Manchuria and China, as the Chinese National Revolutionary Army had only three tank battalions consisting of Vickers export tanks, German PzKpfw I light tanks, and Italian CV33 tankettes to oppose them. However, the Type 95, like the US M3 Stuart, was not designed to fight other tanks, but for infantry support. Due to the IJN's priority in receiving new technology and steel for warship construction, tanks for the IJA and the IJN's SNLF detachments were relegated to receiving what was left. By 1942, Japanese armor remained largely the same as it did in the 1930s, and new tank development was "stymied"...
2021-03-02 19:16:20 +0000 UTC
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'Vocational film showing the work of emergency service personnel... Firefighters must learn to use many tools, be experts in first aid, and must know the theory of firefighting. Their work and training is presented and explained. The many kinds of police work are also presented.'
Originally a public domain film from the Library of Congress Prelinger Archives, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).
https://en.wikipedia.org/wiki/Firefighter
Wikipedia license: http://creativecommons.org/licenses/by-sa/3.0/
A firefighter is a rescuer extensively trained in firefighting, primarily to extinguish hazardous fires that threaten life, property, and the environment as well as to rescue people and in some cases or jurisdictions also animals from dangerous situations. Male firefighters are sometimes referred to colloquially by the historical term fireman (and, less commonly, a female firefighter by the term firewoman) although the use of this terminology is officially discouraged.
The fire service, also known in some countries as the fire brigade or fire department, is one of the three main emergency services. From urban areas to aboard ships, firefighters have become ubiquitous around the world.
The skills required for safe operations are regularly practiced during training evaluations throughout a firefighter's career. Initial firefighting skills are normally taught through local, regional or state-approved fire academies or training courses. Depending on the requirements of a department, additional skills and certifications such as technical rescue and pre-hospital medicine may also be acquired at this time.
Firefighters work closely with other emergency response agencies such as the police and emergency medical service. A firefighter's role may overlap with both. Fire investigators or fire marshals investigate the cause of a fire. If the fire was caused by arson or negligence, their work will overlap with law enforcement. Firefighters also frequently provide some degree of emergency medical service, including certifying and working as full-time paramedics from engine, truck, and rescue companies in some systems to initiate advanced life support until ambulance transport arrives.
The Firefighting is further broken down into skills which include: size-up, extinguishing, ventilation, search and rescue, salvage, containment, mop up and overhaul...
https://en.wikipedia.org/wiki/Police_officer
A police officer, also known as an officer, policeman, or a policewoman is a warranted law employee of a police force. In most countries, "police officer" is a generic term not specifying a particular rank. In some, the use of the rank "officer" is legally reserved for military personnel.
Police officers are generally charged with the apprehension of suspects and the prevention, detection, and reporting of crime, protection and assistance of the general public, and the maintenance of public order. Police officers may be sworn to an oath, and have the power to arrest people and detain them for a limited time, along with other duties and powers. Some officers are trained in special duties, such as counter-terrorism, surveillance, child protection, VIP protection, civil law enforcement, and investigation techniques into major crime including fraud, rape, murder, and drug trafficking. Although many police officers wear a corresponding uniform, some police officers are plain-clothed in order to pass themselves off as civilians. In most countries police officers are given exemptions from certain laws to perform their duties. For example an officer may use force if necessary to arrest or detain a person when it would ordinarily be assault. In some countries, officers can also break road rules to perform their duties...
2021-03-01 18:01:47 +0000 UTC
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Originally a public domain film from the Library of Congress Prelinger Archives, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).
https://en.wikipedia.org/wiki/Douglas_DC-8
Wikipedia license: http://creativecommons.org/licenses/by-sa/3.0/
The Douglas DC-8 (sometimes McDonnell Douglas DC-8) is a narrow-body airliner built by the American Douglas Aircraft Company. After losing the May 1954 US Air Force tanker competition to the Boeing KC-135, Douglas announced in July 1955 its derived jetliner project. In October 1955, Pan Am made the first order along with the competing Boeing 707, and many other airlines followed. The first DC-8 was rolled out in Long Beach Airport on 9 April 1958 and flew for the first time on 30 May. FAA certification was achieved in August 1959 and the DC-8 entered service with Delta Air Lines on September 18.
The six-abreast, low wing airliner was a four-engined jet aircraft, the initial variants are 151 ft (46 m) long. The DC-8-10 was powered by Pratt & Whitney JT3C turbojets and had a 273,000 lb (124 t) MTOW, the DC-8-20 had more powerful JT4A turbojets for a 276,000 lb (125 t) MTOW. The intercontinental models had more fuel capacity and up to 315,000 lb (143 t) MTOW, powered JT4As for the Series 30 and by Rolls-Royce Conway turbofans for the Series 40. The Pratt & Whitney JT3D powered the later DC-8-50 and freighters versions reached a MTOW of 325,000 lb (147 t).
The improved Series 60 was announced in April 1965. The DC-8-61 was stretched by 36 ft (11 m) for 180–220 seats in mixed-class and a MTOW of 325,000 lb (147 t). It first flew on March 14, 1966, was certified on September 2, 1966, and entered service with United Airlines in February 1967. The long-range DC-8-62 followed in April 1967, stretched by 7 ft (2.1 m), could seat up to 189 passengers over 5,200 nmi (9,600 km) with a larger wing for a MTOW up to 350,000 lb (159 t). The DC-8-63 had the long fuselage and the enlarged wing, freighters MTOW reached 355,000 lb (161 t).
The DC-8 was produced until 1972 with 556 aircraft built. It was superseded by larger wide-body airliners including Douglas' DC-10. In 1975, the Series 70 retrofit was proposed with the quieter and more fuel-efficient CFM56 turbofan. Some re-engined freighters are still in use...
Douglas secretly began jet transport project definition studies in mid-1952. By mid-1953 these had developed into a form similar to the final DC-8; an 80-seat, low-wing aircraft with four Pratt & Whitney JT3C turbojet engines, 30° wing sweep, and an internal cabin diameter of 11 feet (3.35 m) to allow five-abreast seating. Maximum weight was to be 190,000 lb (86 metric tons), and range was estimated to be about 3,000–4,000 miles (4,800–6,400 km).
Douglas remained lukewarm about the jet airliner project but believed that the Air Force tanker contract would go to two companies for two different aircraft, as several USAF transport contracts in the past had done. In May 1954, the USAF circulated its requirement for 800 jet tankers to Boeing, Douglas, Convair, Fairchild, Lockheed, and Martin. Boeing was just two months away from having its prototype in the air. Just four months after issuing the tanker requirement, the USAF ordered the first 29 KC-135s from Boeing. Besides Boeing's ability to provide a jet tanker promptly, the flying-boom air-to-air refueling system was also a Boeing product from the KC-97.
Donald Douglas was shocked by the rapidity of the decision which, he said, had been made before the competing companies even had time to complete their bids. He protested to Washington, but without success. Having started on the DC-8 project, Douglas decided that it was better to press on than give up. Consultations with the airlines resulted in several changes: the fuselage was widened by 15 inches (38 cm) to allow six-abreast seating. This led to larger wings and tail surfaces and a longer fuselage. The DC-8 was announced in July 1955. Four versions were offered to begin with, all with the same 150-foot-6-inch (45.87 m) long airframe with a 141-foot-1-inch (43.00 m) wingspan, but varying in engines and fuel capacity, and with maximum weights of about 240,000–260,000 lb (109–118 metric tons). Douglas steadfastly refused to offer different fuselage sizes. The maiden flight was planned for December 1957, with entry into revenue service in 1959. Well aware that they were lagging behind Boeing, Douglas began a major marketing push...
2021-02-28 16:21:57 +0000 UTC
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Originally a public domain film from the National Archives, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).
https://en.wikipedia.org/wiki/Balance_(ability)
Wikipedia license: http://creativecommons.org/licenses/by-sa/3.0/
Balance in biomechanics, is an ability to maintain the line of gravity (vertical line from centre of mass) of a body within the base of support with minimal postural sway. Sway is the horizontal movement of the centre of gravity even when a person is standing still. A certain amount of sway is essential and inevitable due to small perturbations within the body (e.g., breathing, shifting body weight from one foot to the other or from forefoot to rearfoot) or from external triggers (e.g., visual distortions, floor translations). An increase in sway is not necessarily an indicator of dysfunctional balance so much as it is an indicator of decreased sensorimotor control...
Maintaining balance
Maintaining balance requires coordination of input from multiple sensory systems including the vestibular, somatosensory, and visual systems.
Vestibular system: sense organs that regulate equilibrium (equilibrioception); directional information as it relates to head position (internal gravitational, linear, and angular acceleration)
Somatosensory system: senses of proprioception and kinesthesia of joints; information from skin and joints (pressure and vibratory senses); spatial position and movement relative to the support surface; movement and position of different body parts relative to each other
Visual system: Reference to verticality of body and head motion; spatial location relative to objects
The senses must detect changes of spatial orientation with respect to the base of support, regardless of whether the body moves or the base is altered...
Voluntary control of balance
While balance is mostly an automatic process, voluntary control is common. Active control usually takes place when a person is in a situation where balance is compromised. This can have the counter-intuitive effect of increasing postural sway during basic activities such as standing. One explanation for this effect is that conscious control results in over-correcting an instability and "may inadvertently disrupt relatively automatic control processes." While concentration on an external task "promotes the utilization of more automatic control processes."
Balance and dual-tasking
Supra-postural tasks are those activities that rely on postural control while completing another behavioral goal, such as walking or creating a text message while standing upright. Research has demonstrated that postural stability operates to permit the achievement of other activities... Research has shown that spontaneous reductions in postural sway occur in response to the addition of a secondary goal.
McNevin and Wulf (2002) found an increase in postural performance when directing an individual's attention externally compared to directing attention internally That is, focusing attention on the effects of one's movements rather than on the movement itself will boost performance. This results from the use of more automatic and reflexive control processes. When one is focused on their movements (internal focus), they may inadvertently interfere with these automatic processes, decreasing their performance. Externally focusing attention improves postural stability, despite increasing postural sway at times. It is believed that utilizing automatic control processes by focusing attention externally enhances both performance and learning. Adopting an external focus of attention subsequently improves the performance of supra-postural tasks, while increasing postural stability...
2021-02-27 16:36:26 +0000 UTC
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'This film documents the duties and missions of the U.S. soldier in Berlin, Germany. It shows the day-by-day tasks they performed to keep the city's lifelines open to the west, and the continued training and preparation they received in order to handle unrest.'
Originally a public domain film from the National Archives, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).
https://en.wikipedia.org/wiki/Berlin
Wikipedia license: http://creativecommons.org/licenses/by-sa/3.0/
Berlin is the capital and largest city of Germany by both area and population. Its 3,769,495 (2019) inhabitants make it the most populous city proper of the European Union.[8] The city is one of Germany's 16 federal states. It is surrounded by the state of Brandenburg, and contiguous with Potsdam, Brandenburg's capital. The two cities are at the center of the Berlin-Brandenburg capital region, which is, with about six million inhabitants and an area of more than 30,000 km2, Germany's third-largest metropolitan region after the Rhine-Ruhr and Rhine-Main regions.
Berlin straddles the banks of the River Spree, which flows into the River Havel (a tributary of the River Elbe) in the western borough of Spandau. Among the city's main topographical features are the many lakes in the western and southeastern boroughs formed by the Spree, Havel, and Dahme rivers (the largest of which is Lake Müggelsee). Due to its location in the European Plain, Berlin is influenced by a temperate seasonal climate. About one-third of the city's area is composed of forests, parks, gardens, rivers, canals and lakes. The city lies in the Central German dialect area, the Berlin dialect being a variant of the Lusatian-New Marchian dialects.
First documented in the 13th century and situated at the crossing of two important historic trade routes, Berlin became the capital of the Margraviate of Brandenburg (1417–1701), the Kingdom of Prussia (1701–1918), the German Empire (1871–1918), the Weimar Republic (1919–1933), and the Third Reich (1933–1945). Berlin in the 1920s was the third-largest municipality in the world. After World War II and its subsequent occupation by the victorious countries, the city was divided; West Berlin became a de facto West German exclave, surrounded by the Berlin Wall (1961–1989) and East German territory. East Berlin was declared capital of East Germany, while Bonn became the West German capital. Following German reunification in 1990, Berlin once again became the capital of all of Germany.
Berlin is a world city of culture, politics, media and science. Its economy is based on high-tech firms and the service sector, encompassing a diverse range of creative industries, research facilities, media corporations and convention venues. Berlin serves as a continental hub for air and rail traffic and has a highly complex public transportation network. The metropolis is a popular tourist destination. Significant industries also include IT, pharmaceuticals, biomedical engineering, clean tech, biotechnology, construction and electronics.
Berlin is home to world-renowned universities...
Berlin contains three World Heritage Sites: Museum Island; the Palaces and Parks of Potsdam and Berlin; and the Berlin Modernism Housing Estates. Other landmarks include the Brandenburg Gate, the Reichstag building, Potsdamer Platz, the Memorial to the Murdered Jews of Europe, the Berlin Wall Memorial, the East Side Gallery, the Berlin Victory Column, Berlin Cathedral and the Berlin Television Tower, the tallest structure in Germany. Berlin has numerous museums, galleries, libraries, orchestras and sporting events. These include the Old National Gallery, the Bode Museum, the Pergamon Museum, the German Historical Museum, the Jewish Museum Berlin, the Natural History Museum, the Humboldt Forum, which is scheduled to open in late 2020, the Berlin State Library, the Berlin Philharmonic and the Berlin Marathon...
2021-02-26 16:59:45 +0000 UTC
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Silent. In this newsreel clip, a man leaps from a motorboat on to a glider aircraft flying past.
Originally a public domain film from the Library of Congress Prelinger Archives, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
https://en.wikipedia.org/wiki/Stunt
Wikipedia license: http://creativecommons.org/licenses/by-sa/3.0/
A stunt is an unusual and difficult physical feat or an act requiring a special skill, performed for artistic purposes usually on television, theaters, or cinema. Stunts are a feature of many action films. Before computer generated imagery special effects, these effects were limited to the use of models, false perspective and other in-camera effects, unless the creator could find someone willing to jump from car to car or hang from the edge of a skyscraper: the stunt performer or stunt double...
Mechanical effects
A physical stunt is usually performed with help of mechanics. For example, if the plot requires the hero to jump to a high place, the film crew could put the actor in a special harness, and use aircraft high tension wire to pull him up. Piano wire is sometimes used to fly objects, but an actor is never suspended from it as it is brittle and can break under shock impacts. Hero (2003) and House of Flying Daggers (2004) are examples of wuxia films that use kung-fu and are heavily reliant on wire stunts. The Matrix is an example of extensive wire and rigging work in Western cinema.
Vehicular stunts
Performers of vehicular stunts require extensive training and may employ specially adapted vehicles. Stunts can be as simple as a handbrake turn, also known as the bootleg turn, or as advanced as car chases, jumps and crashes involving dozens of vehicles. Rémy Julienne is a well known pioneering automotive stunt performer and coordinator. Another well known vehicular stunt specialist is Englishman Ian Walton, who was the helicopter stunt pilot and stunt designer for many 1980s films, notably the Bond film Never Say Never Again. A Guinness Book of World Records holder stunt driver, Bobby Ore, performed in numerous movies and events and holds a World Record for longest distance driven on two wheels in a London double decker bus (810 feet)...
2021-02-25 18:08:43 +0000 UTC
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Originally a public domain film from the National Archives, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).
https://en.wikipedia.org/wiki/Militarisation_of_space
Wikipedia license: http://creativecommons.org/licenses/by-sa/3.0/
The militarisation of space involves the placement and development of weaponry and military technology in outer space. The early exploration of space in the mid-20th century had, in part, a military motivation, as the United States and the Soviet Union used it as an opportunity to demonstrate ballistic-missile technology and other technologies having the potential for military application. Outer space has since been used as an operating location for military spacecraft such as imaging and communications satellites, and some ballistic missiles pass through outer space during their flight. As of 2019, known deployments of weapons stationed in space include only the Almaz space-station armament and pistols such as the TP-82 Cosmonaut survival pistol (for post-landing, pre-recovery use)...
Early American efforts included the Nike-Zeus Program, Project Defender, the Sentinel Program and the Safeguard Program. The late 1950s Nike-Zeus programme involved firing Nike nuclear missiles against oncoming ICBMs, thus exploding nuclear warheads over the North Pole. This idea was soon scrapped and work began on Project Defender in 1958. Project Defender attempted to destroy Soviet ICBMs at launch with satellite weapon systems, which orbited over Russia. This programme proved infeasible with the technology from that era. Work then began on the Sentinel Program which used anti-ballistic missiles (ABM) to shoot down incoming ICBMs.
In the late 1950s United States Air Force considered detonating an atomic bomb on the Moon to display U.S. superiority to the Soviet Union and the rest of the world (Project A119). In 1959, a feasibility study of a possible military base on the Moon (Project Horizon) was conducted. In 1958, a plan for a 21-airman underground Air Force base on the Moon by 1968 was developed (Lunex Project).
The Safeguard Program was deployed in the mid-1970s and was based on the Sentinel Program. Since the ABM treaty only allowed for construction of a single ABM facility to protect either the nation's capital city or an ICBM field, the Stanley R. Mickelsen Safeguard Complex was constructed near Nekoma, North Dakota to protect the Grand Forks ICBM facility. Though it was only operational as an ABM facility for less than a year, the Perimeter Acquisition Radar (PAR), one of Safeguard's components, was still operational as of 2005. One major problem with the Safeguard Program, and past ABM systems, was that the interceptor missiles, though state-of-the-art, required nuclear warheads to destroy incoming ICBMs. Future ABMs will likely be more accurate and use hit-to-kill or conventional warheads to knock down incoming warheads. The technology involved in such systems was shaky at best, and deployment was limited by the ABM treaty of 1972.
In 1983, American president Ronald Reagan proposed the Strategic Defense Initiative (SDI), a space-based system to protect the United States from attack by strategic nuclear missiles. The plan was ridiculed by some as unrealistic and expensive, and Dr Carol Rosin nicknamed the policy "Star Wars", after the popular science-fiction movie franchise...
United States Space Command
(USSPACECOM), a unified command of the United States military, was created in 1985 to help institutionalise the use of outer space by the United States Armed Forces. The Commander in Chief of U.S. Space Command (CINCUSSPACECOM), with headquarters at Peterson Air Force Base, Colorado was also the Commander in Chief of the bi-national U.S.-Canadian North American Aerospace Defense Command (CINCNORAD), and for the majority of time during USSPACECOM's existence also the Commander of the U.S. Air Force major command Air Force Space Command. Military space operations coordinated by USSPACECOM proved to be very valuable for the U.S.-led coalition in the 1991 Persian Gulf War...
As part of the ongoing initiative to transform the U.S. military, on 26 June 2002, Secretary of Defense Donald Rumsfeld announced that U.S. Space Command would merge with USSTRATCOM. The UCP directed that Unified Combatant Commands be capped at ten, and with the formation of the new United States Northern Command, one would have to be deactivated in order to maintain that level. Thus the USSPACECOM merger into USSTRATCOM...
2021-02-24 18:38:08 +0000 UTC
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Originally a public domain film from the National Archives or Library of Congress Prelinger Archives, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).
https://en.wikipedia.org/wiki/Aircraft_noise_pollution
Wikipedia license: http://creativecommons.org/licenses/by-sa/3.0/
Aircraft noise pollution refers to noise produced by aircraft in flight that has been associated with several negative stress-mediated health effects, from sleep disorders to cardiovascular ones. Governments have enacted extensive controls that apply to aircraft designers, manufacturers, and operators, resulting in improved procedures and cuts in pollution.
Sound production is divided into three categories:
Mechanical noise—rotation of the engine parts, most noticeable when fan blades reach supersonic speeds.
Aerodynamic noise—from the airflow around the surfaces of the aircraft, especially when flying low at high speeds.
Noise from aircraft systems—cockpit and cabin pressurization and conditioning systems, and Auxiliary Power units...
Aircraft noise is noise pollution produced by an aircraft or its components, whether on the ground while parked such as auxiliary power units, while taxiing, on run-up from propeller and jet exhaust, during take off, underneath and lateral to departure and arrival paths, over-flying while en route, or during landing.[citation needed] A moving aircraft including the jet engine or propeller causes compression and rarefaction of the air, producing motion of air molecules. This movement propagates through the air as pressure waves. If these pressure waves are strong enough and within the audible frequency spectrum, a sensation of hearing is produced. Different aircraft types have different noise levels and frequencies. The noise originates from three main sources:
Engine and other mechanical noise
Aerodynamic noise
Noise from aircraft systems...
Much of the noise in propeller aircraft comes equally from the propellers and aerodynamics. Helicopter noise is aerodynamically induced noise from the main and tail rotors and mechanically induced noise from the main gearbox and various transmission chains. The mechanical sources produce narrow band high intensity peaks relating to the rotational speed and movement of the moving parts. In computer modelling terms noise from a moving aircraft can be treated as a line source.
Aircraft gas turbine engines (jet engines) are responsible for much of the aircraft noise during takeoff and climb, such as the buzzsaw noise generated when the tips of the fan blades reach supersonic speeds. However, with advances in noise reduction technologies—the airframe is typically more noisy during landing.
The majority of engine noise is due to jet noise—although high bypass-ratio turbofans do have considerable fan noise. The high velocity jet leaving the back of the engine has an inherent shear layer instability (if not thick enough) and rolls up into ring vortices. This later breaks down into turbulence. The SPL associated with engine noise is proportional to the jet speed (to a high power). Therefore, even modest reductions in exhaust velocity will produce a large reduction in jet noise.
Engines are the main source of aircraft noise. The geared Pratt & Whitney PW1000G helped reduce the noise levels of the Bombardier CSeries, Mitsubishi MRJ and Embraer E-Jet E2 crossover narrowbody aircraft: the gearbox allows the fan to spin at an optimal speed, which is one third the speed of the LP turbine, for slower fan tip speeds. It has a 75% smaller noise footprint than current equivalents. The PowerJet SaM146 in the Sukhoi Superjet 100 features 3D aerodynamic fan blades and a nacelle with a long mixed duct flow nozzle to reduce noise...
2021-02-23 21:05:12 +0000 UTC
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Since the discovery of America by Columbus, the rifle has played a significant role in helping our great country fight for and maintain its freedom. This week's issue of THE BIG PICTURE, narrated by Craig Stevens of "Peter Gunn" fame, offers a moving insight into the history of the rifle and the part it has played in our nation's development.
Originally a public domain film from the National Archives, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).
https://en.wikipedia.org/wiki/Rifle
Wikipedia license: http://creativecommons.org/licenses/by-sa/3.0/
A rifle is a long-barrelled firearm designed for accurate shooting, with a barrel that has a helical pattern of grooves ("rifling") cut into the bore wall. In keeping with their focus on accuracy, rifles are typically designed to be held with both hands and braced firmly against the shooter's shoulder via a buttstock for stability during shooting. Rifles are used extensively in warfare, law enforcement, hunting, and shooting sports.
The term was originally rifled gun, with the verb "rifle" referring to the early modern machining process of creating groovings with cutting tools...
The distinct feature that separates a rifle from the earlier smoothbore long guns (e.g., arquebuses, muskets) is the rifling within its gun barrel. The raised areas of a barrel's rifling are called "lands", which make contact with and exert torque on the projectile as it moves down the bore, imparting a spin around its longitudinal axis. When the projectile leaves the barrel, this spin persists and lends gyroscopic stability to the projectile due to conservation of angular momentum, preventing yawing and tumbling in flight. This allows the use of more elongated and aerodynamically-efficient bullets (as opposed to the spherical balls used in smoothbore muskets) and thus improves range and accuracy...
The grooved gun barrel is considered by many to have been invented as early as 1440 and further developed by Gaspard Kollner of Vienna, Austria, circa 1498. The spirally grooved gun barrel is considered German in origin, invented by Augustus Kotter of Nuremberg circa 1520. Military commanders preferred smooth bore weapons for infantry use because rifles were much more prone to problems due to powder fouling the barrel and because they took longer to reload and fire than muskets.
...The black powder used in early muzzle-loading rifles quickly fouled the barrel, making loading slower and more difficult. The greater range of the rifle was considered to be of little practical use, since the smoke from black powder quickly obscured the battlefield and made it almost impossible to aim the weapon from a distance. Since musketeers could not afford to take the time to stop and clean their barrels in the middle of a battle, rifles were limited to use by sharpshooters and non-military uses like hunting...
The performance of early muskets defined the style of warfare at the time. Due to the lack of accuracy, soldiers were deployed in long lines (thus line infantry) to fire at the opposing forces. Precise aim was thus not necessary to hit an opponent. Muskets were used for comparatively rapid, imprecisely aimed volley fire, and the average soldier could be easily trained to use them.
In the territory of Kentucky, one of the most successful early rifles, the long rifle, was developed over the course of the 18th century. Compared to the more common Brown Bess, they had a tighter bore with no space between bullet and barrel, and still used balls instead of conical bullets. The balls the long rifle used were smaller, allowing the production of more rounds for a given amount of lead. These rifles also had longer barrels, allowing more accuracy, which were rifled with a helical groove. These first started appearing sometime before 1740, one early example being made by Jacob Dickert, a German immigrant. By 1850 there were a number of such manufacturers in the area. The longer barrel was a departure by local gunsmiths from their German roots, allowing bullets to achieve a higher speed (as the burning gunpowder was contained longer) before emerging from the barrel.
The rifle was used for precise shooting, aiming and firing at individual targets, instead of the musket's use for imprecise fire
By the time of the American Revolutionary War, these rifles were commonly used by frontiersmen, and Congress authorized the establishment of ten companies of riflemen...
2021-02-23 21:04:39 +0000 UTC
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Originally a public domain film from the US Government, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).
https://en.wikipedia.org/wiki/Flight_instruments
Wikipedia license: http://creativecommons.org/licenses/by-sa/3.0/
Flight instruments are the instruments in the cockpit of an aircraft that provide the pilot with data about the flight situation of that aircraft, such as altitude, airspeed, vertical speed, heading and much more other crucial information in flight. They improve safety by allowing the pilot to fly the aircraft in level flight, and make turns, without a reference outside the aircraft such as the horizon. Visual flight rules (VFR) require an airspeed indicator, an altimeter, and a compass or other suitable magnetic direction indicator. Instrument flight rules (IFR) additionally require a gyroscopic pitch-bank (artificial horizon), direction (directional gyro) and rate of turn indicator, plus a slip-skid indicator, adjustable altimeter, and a clock. Flight into instrument meteorological conditions (IMC) require radio navigation instruments for precise takeoffs and landings.
The term is sometimes used loosely as a synonym for cockpit instruments as a whole, in which context it can include engine instruments, navigational and communication equipment. Many modern aircraft have electronic flight instrument systems.
Most regulated aircraft have these flight instruments as dictated by the US Code of Federal Regulations, Title 14, Part 91. They are grouped according to pitot-static system, compass systems, and gyroscopic instruments...
The altimeter shows the aircraft's altitude above sea-level by measuring the difference between the pressure in a stack of aneroid capsules inside the altimeter and the atmospheric pressure obtained through the static system. The most common unit for altimeter calibration worldwide is hectopascals (hPa), except for North America and Japan where inches of mercury (inHg) are used. The altimeter is adjustable for local barometric pressure which must be set correctly to obtain accurate altitude readings, usually in either feet or meters. As the aircraft ascends, the capsules expand and the static pressure drops, causing the altimeter to indicate a higher altitude. The opposite effect occurs when descending. With the advancement in aviation and increased altitude ceiling, the altimeter dial had to be altered for use both at higher and lower altitudes. Hence when the needles were indicating lower altitudes i.e. the first 360-degree operation of the pointers was delineated by the appearance of a small window with oblique lines warning the pilot that he or she is nearer to the ground. This modification was introduced in the early sixties after the recurrence of air accidents caused by the confusion in the pilot's mind. At higher altitudes, the window will disappear...
The airspeed indicator shows the aircraft's speed relative to the surrounding air. Knots is the currently most used unit, but kilometers per hour is sometimes used instead. The airspeed indicator works by measuring the ram-air pressure in the aircraft's Pitot tube relative to the ambient static pressure. The indicated airspeed (IAS) must be corrected for nonstandard pressure and temperature in order to obtain the true airspeed (TAS). The instrument is color coded to indicate important airspeeds such as the stall speed, never-exceed airspeed, or safe flap operation speeds...
The VSI (also sometimes called a variometer, or rate of climb indicator) senses changing air pressure, and displays that information to the pilot as a rate of climb or descent in feet per minute, meters per second or knots...
2021-02-22 18:37:29 +0000 UTC
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Originally a public domain film from the Library of Congress Prelinger Archives, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).
https://en.wikipedia.org/wiki/Nuclear_warfare
Wikipedia license: http://creativecommons.org/licenses/by-sa/3.0/
Nuclear warfare (sometimes atomic warfare or thermonuclear warfare) is a military conflict or political strategy which deploys nuclear weaponry. Nuclear weapons are weapons of mass destruction; in contrast to conventional warfare, nuclear warfare can produce destruction in a much shorter time and can have a long-lasting radiological result. A major nuclear exchange would have long-term effects, primarily from the fallout released, and could also lead to a "nuclear winter" that could last for decades, centuries, or even millennia after the initial attack. Some analysts dismiss the nuclear winter hypothesis, and calculate that even with nuclear weapon stockpiles at Cold War highs, although there would be billions of casualties, billions more rural people would nevertheless survive. However, others have argued that secondary effects of a nuclear holocaust, such as nuclear famine and societal collapse, would cause almost every human on Earth to starve to death.
So far, two nuclear weapons have been used in the course of warfare, both by the United States near the end of World War II. On August 6, 1945, a uranium gun-type device (code name "Little Boy") was detonated over the Japanese city of Hiroshima. Three days later, on August 9, a plutonium implosion-type device (code name "Fat Man") was detonated over the Japanese city of Nagasaki. Together, these two bombings resulted in the deaths of approximately 200,000 people.
After World War II, nuclear weapons were also developed by the Soviet Union (1949), the United Kingdom (1952), France (1960), and the People's Republic of China (1964), which contributed to the state of conflict and extreme tension that became known as the Cold War. In 1974, India, and in 1998, Pakistan, two countries that were openly hostile toward each other, developed nuclear weapons. Israel (1960s) and North Korea (2006) are also thought to have developed stocks of nuclear weapons, though it is not known how many. The Israeli government has never admitted nor denied having nuclear weapons, although it is known to have constructed the reactor and reprocessing plant necessary for building nuclear weapons. South Africa also manufactured several complete nuclear weapons in the 1980s, but subsequently became the first country to voluntarily destroy their domestically made weapons stocks and abandon further production (1990s). Nuclear weapons have been detonated on over 2,000 occasions for testing purposes and demonstrations.
After the collapse of the Soviet Union in 1991 and the resultant end of the Cold War, the threat of a major nuclear war between the two nuclear superpowers was generally thought to have declined. Since then, concern over nuclear weapons has shifted to the prevention of localized nuclear conflicts resulting from nuclear proliferation, and the threat of nuclear terrorism...
2021-02-22 18:36:51 +0000 UTC
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SHOWS HOW THE PILOT GUIDES A SHIP THROUGH BAYS & CHANNELS, DIRECTING MEN IN THE PILOT HOUSE & ENGINE ROOM, IN THE TUGBOATS & ON DOCKS. GIVES DETAILS ON NAVIGATING INSTRUMENTS & SAFETY.
Originally a public domain film from the Library of Congress Prelinger Archives, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).
https://en.wikipedia.org/wiki/Maritime_pilot
Wikipedia license: http://creativecommons.org/licenses/by-sa/3.0/
A maritime pilot, marine pilot, harbor pilot, port pilot, ship pilot, or simply pilot, is a mariner who maneuvers ships through dangerous or congested waters, such as harbors or river mouths. They are navigational experts possessing knowledge of the particular waterway such as its depth, currents, and hazards, as well as being experts in handling ships of all types and size. A Maritime pilot is an expert ship handler who is licensed or authorised by a recognised pilotage authority...
The word pilot probably came from Middle French pilot, pillot, from Italian pilota, from Late Latin pillottus; perhaps ultimately from Ancient Greek πηδόν (pēdón, "blade of an oar, oar").
The work functions of the pilot go back to Ancient Greece and Roman times, when locally experienced harbour captains, mainly local fishermen, were employed by incoming ships' captains to bring their trading vessels into port safely.
Pilots had to have quick transport to get from the port to the incoming ships. They initially used their own fishing boats to reach the incoming vessels, but these were heavy working boats, which led to the development of the specialised pilot boat.
In the inland brown water trade another type of pilots are known as trip pilots. Due to the shortage of qualified posted masters these independent contractors fill the holes in the manning schedule on inland push boats on various inland river routes.
Because the act of pilotage needed to be regulated and to ensure that pilots had adequate insurance, the harbours started to use licensed pilots. If a licensed pilot offered his services, an incoming ship was obliged to bring the pilot on board.
A Sandy Hook pilot is a licensed maritime pilot for the Port of New York and New Jersey, the Hudson River, and Long Island Sound. The Sandy Hook pilots have been piloting ships in the New York Harbor for over 300 years. The pilots of New York and Boston faced fierce cold, snow, and ice during the winter. The Great Blizzard of 1888 was so severe that eight pilot boats were actually driven ashore and damaged on the New York harbor. Some of the schooners were lost at sea...
2021-02-21 18:17:03 +0000 UTC
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INSIDE THE CELL - PART I - ENZYMES IN INTRACELLULAR CHEMISTRY
CONCEPT OF INTRACELLULAR ENZYMATIC ACTION - BIOCHEMICAL PHENOMENA DEMONSTRATION - LABORATORY TECHNIQUES OF SEVERAL NOBEL PRIZE WINNING SCIENTISTS.
Originally a public domain film from the National Archives, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).
https://en.wikipedia.org/wiki/Enzyme
Wikipedia license: http://creativecommons.org/licenses/by-sa/3.0/
Enzymes (/ˈɛnzaɪmz/) are proteins that act as biological catalysts (biocatalysts). Catalysts accelerate chemical reactions. The molecules upon which enzymes may act are called substrates, and the enzyme converts the substrates into different molecules known as products. Almost all metabolic processes in the cell need enzyme catalysis in order to occur at rates fast enough to sustain life. Metabolic pathways depend upon enzymes to catalyze individual steps. The study of enzymes is called enzymology and a new field of pseudoenzyme analysis has recently grown up, recognising that during evolution, some enzymes have lost the ability to carry out biological catalysis, which is often reflected in their amino acid sequences and unusual 'pseudocatalytic' properties.
Enzymes are known to catalyze more than 5,000 biochemical reaction types. Other biocatalysts are catalytic RNA molecules, called ribozymes. Enzymes' specificity comes from their unique three-dimensional structures.
Like all catalysts, enzymes increase the reaction rate by lowering its activation energy. Some enzymes can make their conversion of substrate to product occur many millions of times faster. An extreme example is orotidine 5'-phosphate decarboxylase, which allows a reaction that would otherwise take millions of years to occur in milliseconds. Chemically, enzymes are like any catalyst and are not consumed in chemical reactions, nor do they alter the equilibrium of a reaction. Enzymes differ from most other catalysts by being much more specific. Enzyme activity can be affected by other molecules: inhibitors are molecules that decrease enzyme activity, and activators are molecules that increase activity. Many therapeutic drugs and poisons are enzyme inhibitors. An enzyme's activity decreases markedly outside its optimal temperature and pH, and many enzymes are (permanently) denatured when exposed to excessive heat, losing their structure and catalytic properties.
Some enzymes are used commercially, for example, in the synthesis of antibiotics. Some household products use enzymes to speed up chemical reactions: enzymes in biological washing powders break down protein, starch or fat stains on clothes, and enzymes in meat tenderizer break down proteins into smaller molecules, making the meat easier to chew...
2021-02-21 18:16:31 +0000 UTC
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SM-65 Atlas ICBM: Project Atlas contractor's report, 3rd Quarter 1959. Covers all areas of Atlas missile development.
Originally a public domain film, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).
http://en.wikipedia.org/wiki/SM-65_Atlas
Wikipedia license: http://creativecommons.org/licenses/by-sa/3.0/
The SM-65 Atlas was the first intercontinental ballistic missile (ICBM) developed and deployed by the United States. It was built for the U.S. Air Force by Convair Division of General Dynamics at the Kearny Mesa assembly plant north of San Diego, California. Atlas became operational as an ICBM in October 1959 and was used as a first stage for satellite launch vehicles for half a century. The Atlas missile's warhead was over 100 times more powerful than the bomb dropped over Nagasaki in 1945.
An initial development contract was given to Consolidated Vultee Aircraft (Convair) on 16 January 1951 for what was then called MX-1593, but at a relatively low priority. The 1953 testing of the first dry fuel H-bomb in the Soviet Union led to the project being dramatically accelerated. The initial design completed by Convair in 1953 was larger than the missile that eventually entered service. Estimated warhead weight was lowered from 8,000 lb (3,630 kg) to 3,000 lb (1,360 kg) based on highly favorable U.S. nuclear warhead tests in early 1954, and on 14 May 1954 the Atlas program was formally given the highest national priority. A major development and test contract was awarded to Convair on 14 January 1955 for a 10-foot (3 m) diameter missile to weigh about 250,000 lb (113,400 kg). Atlas development was tightly controlled by the Air Force's Western Development Division, WDD, later part of the Air Force Ballistic Missile Division... The first successful flight of a highly instrumented Atlas missile to full range occurred 28 November 1958. Atlas ICBMs were deployed operationally from 31 October 1959 to 12 April 1965.
On 18 December 1958, the launch of Atlas 10B sent the missile into orbit around the Earth (without use of an upper stage) carrying the "SCORE" (Signal Communications by Orbiting Relay Equipment) communications payload. Atlas 10B/SCORE, at 8,750 lb (3,970 kg) was the heaviest man-made object then in orbit, the first voice relay satellite, and the first man-made object in space easily visible to the naked eye due to the large, mirror-polished stainless steel tank... Many retired Atlas ICBMs would be used as launch vehicles, most with an added spin-stabilized solid rocket motor upper stage for polar orbit military payloads. Even before its military use ended in 1965, Atlas had placed four Project Mercury astronauts in orbit and was becoming the foundation for a family of successful space launch vehicles, most notably Atlas Agena and Atlas Centaur.
Mergers led to the acquisition of the Atlas Centaur line by Lockheed Martin which in turn became part of the United Launch Alliance. Today Lockheed Martin and ULA support a new Atlas rocket family based on the larger "Atlas V" which still uses the unique and highly efficient Centaur upper stage. Atlas V stage one is powered by a Russian RD-180 oxygen/kerosene engine and uses conventional aluminum isogrid tankage rather than the thin-wall, pressure-stabilized stainless steel tanks of the original Convair Atlas. Payload weights have increased along with launch vehicle weights over the years so the current Atlas V family serves many of the same type commercial, DoD, and planetary missions as earlier Atlas Centaurs...
2021-02-20 20:57:59 +0000 UTC
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Originally a public domain film from the US Navy, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).
https://en.wikipedia.org/wiki/Vapor-compression_desalination
Wikipedia license: http://creativecommons.org/licenses/by-sa/3.0/
Vapor-compression desalination (VC) refers to a distillation process where the evaporation of sea or saline water is obtained by the application of heat delivered by compressed vapor.
Overview
Since compression of the vapor increases both the pressure and temperature of the vapor, it is possible to use the latent heat rejected during condensation to generate additional vapor. The effect of compressing water vapor can be done by two methods.
The first method utilizes an ejector system motivated by steam at manometric pressure from an external source in order to recycle vapor from the desalination process. The form is designated ejectocompression or thermocompression.
Using the second method, water vapor is compressed by means of a mechanical device, electrically driven in most cases. This form is designated mechanical vapor compression (MVC). The MVC process comprises two different versions: vapor compression (VC) and vacuum vapor compression (VVC). VC designates those systems in which the evaporation effect takes place at manometric pressure, and VVC the systems in which evaporation takes place at sub-atmospheric pressures (under vacuum).
The compression is mechanically powered by something such as a compression turbine. As vapor is generated, it is passed over to a heat exchanging condenser which returns the vapor to water. The resulting fresh water is moved to storage while the heat removed during condensation is transmitted to the remaining feedstock.
The VVC process is the more efficient distillation process available in the market today in terms of energy consumption and water recovery ratio. As the system is electrically driven, it is considered a "clean" process, it is highly reliable and simple to operate and maintain...
2021-02-20 20:57:29 +0000 UTC
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VIETNAM - COMBAT AND OTHER ACTIVITY, JANUARY, FEBRUARY, MARCH, 1966 - 25TH INFANTRY...
Originally a public domain film from the National Archives, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).
https://en.wikipedia.org/wiki/Operation_Masher
Wikipedia license: http://creativecommons.org/licenses/by-sa/3.0/
Operation Masher (24 January—6 March 1966) was in early 1966 the largest search and destroy mission that had been carried out in the Vietnam War up until that time. It was a combined mission of the United States Army, Army of the Republic of Vietnam (ARVN), and Republic of Korea Army (ROK) in Bình Định Province on the central coast of South Vietnam. The People's Army of Vietnam (PAVN) 3rd Division, made up of two regiments of North Vietnamese regulars and one regiment of main force Viet Cong (VC) guerrillas, controlled much of the land and many of the people of Bình Định Province, which had a total population of about 800,000. A CIA report in 1965 said that Binh Dinh was "just about lost" to the communists.
The name "Operation Masher" was changed to "Operation White Wing", because President Lyndon Johnson wanted the name changed to one that sounded more benign. Adjacent to the operational area of Masher/White Wing in Quang Ngai province the U.S. and South Vietnamese Marine Corps carried out a complementary mission called Operation Double Eagle.
The 1st Cavalry Division (Airmobile) was the principal U.S. ground force involved in Operation Masher and that operation was marked as a success by its commanders. Claims are made that the PAVN 3rd Division had been dealt a hard blow, but intelligence reports indicated that a week after the withdrawal of the 1st Cavalry PAVN soldiers were returning to take control of the area where Operation Masher had taken place. Most of the PAVN/VC had slipped away prior to or during the operation, and discrepancy between weapons recovered and body count led to criticisms of the operation.
Allegations that there were a reported six civilian casualties for every reported PAVN/VC casualty during the Fulbright Hearings prompted growing criticism of US conduct of the war and contributed to greater public dissension at home. During Operation Masher, the ROK Capital Division were alleged to have committed the Bình An/Tây Vinh massacre on 26 February 1966. The operation would create almost 125,000 homeless people in this province, and the PAVN/VC forces would reappear just months after the US had conducted the operation...
2021-02-19 18:33:01 +0000 UTC
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'The American tradition of the buffet supper is shown in its simple preparation. A "must" for the homemaker or hostess.'
Originally a public domain film from the Library of Congress Prelinger Archives, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).
https://en.wikipedia.org/wiki/Buffet
Wikipedia license: http://creativecommons.org/licenses/by-sa/3.0/
A buffet is a system of serving meals in which food is placed in a public area where the diners serve themselves. A form of service à la française, buffets are offered at various places including hotels, restaurants, and many social events. Buffet restaurants normally offer all-you-can-eat food for a set price, but some measure prices by weight or by number of dishes. Buffets usually have some hot dishes, so the term cold buffet (see Smörgåsbord) has been developed to describe formats lacking hot food. Hot or cold buffets usually involve dishware and utensils, but a finger buffet is an array of foods that are designed to be small and easily consumed only by hand, such as cupcakes, slices of pizza, foods on cocktail sticks, etc.
The essential feature of the various buffet formats is that the diners can directly view the food and immediately select which dishes they wish to consume, and usually also can decide how much food they take. Buffets are effective for serving large numbers of people at once, and are often seen in institutional settings, business conventions, or large parties...
Home entertaining
Since a buffet involves diners serving themselves, it has in the past been considered an informal form of dining, less formal than table service. In recent years, however, buffet meals are increasingly popular among hosts of home dinner parties, especially in homes where limited space complicates the serving of individual table places...
In the 19th century, supper, a lighter meal some hours after the main dinner, was sometimes served as a buffet (and so called), especially late at night at grand balls, where not everyone present would want to eat, or at the same time, or in the same quantity. Even in a very large building, at a large ball there might not be enough space to seat all guests at the same time, or servants to serve them in the manner required by the prevailing customs. A large cooked English breakfast with various choices was also very often routinely served this way, for similar reasons. Even when many servants were on hand, there might be an element of self-service. The term buffet originally referred to the French sideboard furniture where the food was placed, but eventually became applied to the serving format.
At balls, the "buffet" was also where drinks were obtained, either by circulating footmen supplying orders from guests, but often by the male guests. During the Victorian period, it became usual for guests to have to eat standing up. In fact John Conrade Cooke's cookbook Cookery and Confectionery, (London: 1824) says it was already "the present fashion". In a report on a ball in 1904, a departure from "the usual stand-up buffet supper", with parties being able to reserve tables, was praised.
Scandinavians like to claim that the buffet table originates from the brännvinsbord (Swedish schnapps, or shot of alcoholic beverage) table from the middle of 16th century. This custom had its prime during the early 18th century. The smörgåsbord buffet did not increase in popularity until the expansion of the railroads throughout Europe.
The smörgåsbord table was originally a meal where guests gathered before dinner for a pre-dinner drink, and was not part of the formal dinner that followed. The smörgåsbord buffet was often held in separate rooms for men and women before the dinner was served.
Smörgåsbord became internationally known as "smorgasbord" at the 1939 New York World's Fair exhibition, as the Swedes had to invent a new way of showcasing the best of Swedish food to large numbers of visitors...
2021-02-19 18:32:28 +0000 UTC
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The Semi-Automatic Ground Environment (SAGE) was a system of large computers... that coordinated data from many radar sites and processed it to produce a single unified image... SAGE directed and controlled the NORAD response to a Soviet air attack...
Originally a public domain film, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).
https://en.wikipedia.org/wiki/Semi-Automatic_Ground_Environment
Wikipedia license: http://creativecommons.org/licenses/by-sa/3.0/
The Semi-Automatic Ground Environment (SAGE) was a system of large computers and associated networking equipment that coordinated data from many radar sites and processed it to produce a single unified image of the airspace over a wide area. SAGE directed and controlled the NORAD response to a Soviet air attack, operating in this role from the late 1950s into the 1980s...
The processing power behind SAGE was supplied by the largest computer ever built, the AN/FSQ-7. Each SAGE Direction Center (DC) housed an FSQ-7 which occupied an entire floor, approximately 22,000 square feet (2,000 m2) not including supporting equipment. Information was fed to the DCs from a network of radar stations as well as readiness information from various defence sites. The computers, based on the raw radar data, developed "tracks" for the reported targets, and automatically calculated which defences were within range. Operators used light guns to select targets on-screen for further information, select one of the available defences, and issue commands to attack. These commands would then be automatically sent to the defence site via teleprinter.
Connecting the various sites was an enormous network of telephones, modems and teleprinters. Later additions to the system allowed SAGE's tracking data to be sent directly to CIM-10 Bomarc missiles and some of the US Air Force's interceptor aircraft in-flight, directly updating their autopilots to maintain an intercept course without operator intervention. Each DC also forwarded data to a Combat Center (CC) for "supervision of the several sectors within the division" ("each combat center [had] the capability to coordinate defense for the whole nation").
SAGE became operational in the late 1950s and early 1960s at a combined cost of billions of dollars. It was noted that the deployment cost more than the Manhattan Project, which it was, in a way, defending against. Throughout its development, there were continual concerns about its real ability to deal with large attacks, and the Operation Skyshield tests showed that only about one-fourth of enemy bombers would have been intercepted. Nevertheless, SAGE was the backbone of NORAD's air defense system into the 1980s, by which time the tube-based FSQ-7's were increasingly costly to maintain and completely outdated. Today the same command and control task is carried out by microcomputers, based on the same basic underlying data...
https://en.wikipedia.org/wiki/AN/FSQ-7_Combat_Direction_Central
The AN/FSQ-7 Combat Direction Central, referred to as the Q7 for short, was a computerized command and control system for Cold War ground-controlled interception used in the USAF Semi-Automatic Ground Environment (SAGE) air defense network. The largest discrete computer system ever built, each of the 24 installed machines weighed 250 tons. The AN/FSQ-7 used a total of 60,000 vacuum tubes (49,000 in the computers) and up to 3 megawatts of electricity, performing about 75,000 instructions per second for networking regional radars.
The installations were configured as duplex systems, using a pair of AN/FSQ-7 computers to provide fault tolerance. One was active at any time, the other on standby. The standby system copied data from the active system to minimize switchover time if needed. A scheduled switchover took place every day.
The AN/FSQ-7 calculated one or more predicted interception points for assigning manned aircraft or CIM-10 Bomarc missiles to intercept an intruder using the Automatic Target and Battery Evaluation (ATABE) algorithm. Also used in the Nike AN/FSG-1 system, ATABE automated the Whiz Wheel (Felsenthal CPU-73 A/P Air Navigation Attack Computer) method used in manual command post operations.
The Q7 fire button launched the Bomarc, and an additional Q7 algorithm automatically directed the missile during climb and cruise to the beginning of its supersonic dive...
2021-02-18 21:01:54 +0000 UTC
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'This THE BIG PICTURE story tells of America's citizen-soldier. This program explores how the Reserve forces play their vital role in the nation's defense effort.'
Originally a public domain film from the National Archives, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).
https://en.wikipedia.org/wiki/United_States_Army_Reserve
Wikipedia license: http://creativecommons.org/licenses/by-sa/3.0/
The United States Army Reserve (USAR) is a reserve force of the United States Army. Together, the Army Reserve and the Army National Guard constitute the Army element of the reserve components of the United States Armed Forces.
Since July 2020, the Chief of the United States Army Reserve is Lieutenant General Jody J. Daniels. The senior enlisted leader of the Army Reserve is Command Sergeant Major Andrew J. Lombardo...
History
Origins
On 23 April 1908 Congress created the Medical Reserve Corps, the official predecessor of the Army Reserve.[7] After World War I, under the National Defense Act of 1920, Congress reorganized the U.S. land forces by authorizing a Regular Army, a National Guard, and an Organized Reserve (Officers Reserve Corps and Enlisted Reserve Corps) of unrestricted size, which later became the Army Reserve. This organization provided a peacetime pool of trained Reserve officers and enlisted men for use in war. The Organized Reserve included the Officers Reserve Corps, Enlisted Reserve Corps, and Reserve Officers' Training Corps (ROTC).
Interwar period and World War II
The Organized Reserve infantry divisions raised immediately after World War I continued the lineage and geographic area distribution of National Army divisions that had served in the war. They were maintained on paper with all of their officers and one-third of their enlisted men. Units in other arms of the Army besides infantry, most notably cavalry, field artillery and engineers were also formed. Organized Reserve units, depending upon their geographic area, maintained relationships with one or several colleges or universities, which populated them with officers through the ROTC. In the event of war, Organized Reserve officers and enlisted men would be called to duty to form the cores of the divisions they were assigned to, and also be moved to other parts of the Army that needed officers. Service in the Organized Reserve during the interwar period was not as appealing as the Army expected. Most divisions reached their full complement of officers, but had less than 100 enlisted men, since there was no incentive for them to serve...
The 101st Infantry Division was designated a division of the Organized Reserve after World War I and assigned to the state of Wisconsin; unlike the 82nd Airborne Division, the Reserve division was disbanded when the 101st Airborne Division was raised in the Army of the United States on 15 August 1942.
Cold War
A tentative troop basis for the Organized Reserve Corps (ORC), prepared in March 1946, outlined 25 divisions: three armored, five airborne, and 17 infantry. These divisions and all other Organized Reserve Corps units were to be maintained in one of three strength categories, labeled Class A, Class B, and Class C. Class A units were divided into two groups, one for combat and one for service, and units were to be at required table of organization strength; Class B units were to have their full complement of officers and enlisted cadre strength; and Class C were to have officers only. The troop basis listed nine divisions as Class A, nine as Class B, and seven as Class C.
Major General Ray E. Porter therefore proposed reclassification of all Class A divisions as Class B units. Eventually the War Department agreed and made the appropriate changes. Although the dispute over Class A units lasted several months, the War Department proceeded with the reorganization of the Organized Reserve Corps divisions during the summer of 1946...
The plan the army commanders received called for twenty-five Organized Reserve Corps divisions, but the divisions activated between September 1946 and November 1947 differed somewhat from the original plans. The First United States Army declined to support an airborne division, and the 98th Infantry Division replaced the 98th Airborne Division. After the change, the Organized Reserve Corps had four airborne, three armored, and eighteen infantry divisions...
2021-02-18 21:01:16 +0000 UTC
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Originally a public domain film, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).
https://en.wikipedia.org/wiki/Healthy_diet
Wikipedia license: http://creativecommons.org/licenses/by-sa/3.0/
A healthy diet is a diet that helps to maintain or improve overall health. A healthy diet provides the body with essential nutrition: fluid, macronutrients, micronutrients, and adequate calories.
For people who are healthy, a healthy diet is not complicated and contains mostly fruits, vegetables, and whole grains, and includes little to no processed food and sweetened beverages. The requirements for a healthy diet can be met from a variety of plant-based and animal-based foods, although a non-animal source of vitamin B12 is needed for those following a vegan diet. Various nutrition guides are published by medical and governmental institutions to educate individuals on what they should be eating to be healthy. Nutrition facts labels are also mandatory in some countries to allow consumers to choose between foods based on the components relevant to health.
A healthy lifestyle includes getting exercise every day along with eating a healthy diet. A healthy lifestyle may lower disease risks, such as obesity, heart disease, type 2 diabetes, hypercholesterolemia, hypertension and cancer.
There are specialized healthy diets, called medical nutrition therapy, for people with various diseases or conditions. There are also prescientific ideas about such specialized diets, as in dietary therapy in traditional Chinese medicine...
Recommendations
World Health Organization
The World Health Organization (WHO) makes the following 5 recommendations with respect to both populations and individuals:
Maintain a healthy weight by eating roughly the same number of calories that your body is using.
Limit intake of fats. Not more than 30% of the total calories should come from fats. Prefer unsaturated fats to saturated fats. Avoid trans fats.
Eat at least 400 grams of fruits and vegetables per day (potatoes, sweet potatoes, cassava and other starchy roots do not count). A healthy diet also contains legumes (e.g. lentils, beans), whole grains and nuts.
Limit the intake of simple sugars to less than 10% of calorie (below 5% of calories or 25 grams may be even better).
Limit salt / sodium from all sources and ensure that salt is iodized. Less than 5 grams of salt per day can reduce the risk of cardiovascular disease.
WHO stated that insufficient vegetables and fruit is the cause of 2.8% of deaths worldwide.
Other WHO recommendations include:
ensuring that the foods chosen have sufficient vitamins and certain minerals;
avoiding directly poisonous (e.g. heavy metals) and carcinogenic (e.g. benzene) substances;
avoiding foods contaminated by human pathogens (e.g. E. coli, tapeworm eggs);
and replacing saturated fats with polyunsaturated fats in the diet, which can reduce the risk of coronary artery disease and diabetes.
United States Department of Agriculture
The Dietary Guidelines for Americans by the United States Department of Agriculture (USDA) recommends three healthy patterns of diet, summarized in the table below, for a 2000 kcal diet.
It emphasizes both health and environmental sustainability and a flexible approach. The committee that drafted it wrote: "The major findings regarding sustainable diets were that a diet higher in plant-based foods, such as vegetables, fruits, whole grains, legumes, nuts, and seeds, and lower in calories and animal-based foods is more health promoting and is associated with less environmental impact than is the current U.S. diet. This pattern of eating can be achieved through a variety of dietary patterns, including the “Healthy U.S.-style Pattern”, the “Healthy Vegetarian Pattern" and the "Healthy Mediterranean-style Pattern". Food group amounts are per day, unless noted per week...
2021-02-17 18:41:37 +0000 UTC
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'Shows the difference social class makes in the lives of three high school boys. Explains how one boy is able to raise his social status.'
Originally a public domain film from the Library of Congress Prelinger Archives, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).
https://en.wikipedia.org/wiki/Social_class_in_the_United_States
Wikipedia license: http://creativecommons.org/licenses/by-sa/3.0/
Social class in the United States refers to the idea of grouping Americans by some measure of social status, typically economic, however it could also refer to social status or location. The idea that American society can be divided into social classes is disputed, and there are many competing class systems.
Many Americans believe in a social class system that has three different groups or classes: the American rich, the American middle class, and the American poor. More complex models propose as many as a dozen class levels, including levels such as high upper class, upper class, upper middle class, middle class, lower middle class, lower class and lower lower middle class, while others disagree with the American construct of social class completely. Most definitions of a class structure group its members according to wealth, income, education, type of occupation, and membership within a hierarchy, specific subculture, or social network. Most concepts of American social class do not focus on race or ethnicity as a characteristic within the stratification system, although these factors are closely related.
Sociologists Dennis Gilbert, William Thompson, Joseph Hickey, and James Henslin have proposed class systems with six distinct social classes. These class models feature an upper or capitalist class consisting of the rich and powerful, an upper middle class consisting of highly educated and affluent professionals, a middle class consisting of college-educated individuals employed in white-collar industries, a lower middle class composed of semi-professionals with typically some college education, a working class constituted by clerical and blue collar workers whose work is highly routinized, and a lower class divided between the working poor and the unemployed underclass...
Social class is sometimes presented as a description of how members of the society have sorted themselves along a continuum of positions varying in importance, influence, prestige, and compensation. In these models, certain occupations are considered to be desirable and influential, while others are considered to be menial, repetitive, and unpleasant. (In some cases, non-occupational roles such as a parent or volunteer mentor, are also considered) Generally, the higher the ranking on such a scale, the higher the skill and education levels required to perform it.
Some sociologists consider the higher income and prestige of higher ranked jobs to simply be incentives to encourage members of society to obtain the skills necessary to perform important work. This is an important mechanism in the economic theory of capitalism, and is compatible with the notion that class is mutable and determined by a combination of choices and opportunities...
Income in the United States is most commonly measured by United States Census Bureau in terms of either household or individual and remains one of the most prominent indicators of class status. As 82% of all households, 16% of those in the top quintiles, had two income earners the discrepancy between household and personal income is quite considerable. In 2005 the top 95% of income earners made $12,500 or more, while 18% of households had incomes over $100,000. Personal income is largely the result of scarcity. As individuals who hold higher status positions tend to possess rare skills or assume positions society deems very essential, have higher incomes. Overall the median household income was $46,326 in 2005 while the median personal income (including only those above the age of 25) was $32,140.
Per capita household income, the income a household is able to allocate to each member of the household is also an important variable in determining a given household's standard of living. A high household income may be offset by a large household size; thus, resulting in a low per capita household income. In 2005, the median household income per capita was $24,672...
2021-02-17 18:40:54 +0000 UTC
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'Presents a lesson in thrift and budgeting. Points out the value of setting up a budget for systematic savings by careful buying without extravagances, and choosing between immediate and future satisfactions.'
Originally a public domain film from the Library of Congress Prelinger Archives, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).
https://en.wikipedia.org/wiki/Personal_budget
Wikipedia license: http://creativecommons.org/licenses/by-sa/3.0/
A personal budget or home budget is a finance plan that allocates future personal income towards expenses, savings and debt repayment. Past spending and personal debt are considered when creating a personal budget. There are several methods and tools available for creating, using and adjusting a personal budget. For example, jobs are an income source, while bills and rent payments are expenses...
Concepts
Personal budgeting, while not particularly difficult, tends to carry a negative connotation among many people . Sticking to a few basic concepts helps to avoid several common pitfalls of budgeting.
Purpose
A budget should have a purpose or defined goal that is achieved within a certain time period. Knowing the source and amount of income and the amounts allocated to expense events are as important as when those cash flow events occur.
Simplicity
The more complicated the budgeting process is, the less likely a person is to keep up with it. The purpose of a personal budget is to identify where income and expenditure is present in the common household; it is not to identify each individual purchase ahead of time. How simplicity is defined with regards to the use of budgeting categories varies from family to family, but many small purchases can generally be lumped into one category (Car, Household items, etc.).
Flexibility
The budgeting process is designed to be flexible; the consumer should have an expectation that a budget will change from month to month, and will require monthly review. Cost overruns in one category of a budget should in the next month be accounted for or prevented. For example, if a family spends $40 more than they planned on food in spite of their best efforts, next month's budget should reflect an approximate $40 increase and corresponding decrease in other parts of the budget.
"Busting the budget" is a common pitfall in personal budgeting; frequently busting the budget can allow consumers to fall into pre-budgeting spending habits. Anticipating budget-busting events (and underspending in other categories), and modifying the budget accordingly, allows consumers a level of flexibility with their incomes and expenses.
Budgeting for irregular income
Special precautions need to be taken for families operating on an irregular income. Households with an irregular income should keep two common major pitfalls in mind when planning their finances: spending more than their average income, and running out of money even when income is on average...
2021-02-16 21:16:23 +0000 UTC
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A STUDY OF DOLPHINS AND OTHER SEA ANIMALS, SUCH AS THE WHALE AND SEA LION, IN MANS CONTINUING SEARCH FOR KNOWLEDGE OF THE SEA AND HOW TO SURVIVE IN IT. SHOWN ARE THE METHODS OF CATCHING, TRAINING AND TESTING DOLPHINS AND THE RESULTS OF SOME OF THESE TESTS IN WHICH -TUFFY- WAS USED AS THE SUBJECT.
Originally a public domain film from the National Archives, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).
https://en.wikipedia.org/wiki/Military_marine_mammal
Wikipedia license: http://creativecommons.org/licenses/by-sa/3.0/
A military marine mammal is a cetacean or pinniped that has been trained for military uses. Examples include bottlenose dolphins, seals, sea lions and belugas...
Dolphins
Rumors of military dolphins include training them to lay underwater mines, to locate enemy combatants, or to seek and destroy submarines using kamikaze methods... The U.S. Navy denies ever having trained its marine mammals to harm or injure humans in any way or to carry weapons to destroy ships.
Soviet Union Navy dolphins
The Soviet Navy operated a research facility 44.5800°N 33.4023°E to explore military uses of marine mammals at Kazachya Bukhta, near Sevastopol...
Russian Federation, Ukraine and Iran
After the fall of the Soviet Union, the Soviet military dolphin program was passed to the Ukrainian Navy... After the 2014 annexation of Crimea, the Ukrainian dolphin program was taken over by Russia...
Government public records show that in 2016, five bottlenose dolphins were purchased by the Russian defence ministry from Moscow’s Utrish Dolphinarium.
United States Navy dolphins
The U.S. Navy trains dolphins and sea lions under the U.S. Navy Marine Mammal Program, which is based in San Diego, California. They get some of their dolphins from the Gulf of Mexico. Military dolphins were used by the U.S. Navy during the First and Second Gulf Wars, and their use dates back to the Vietnam War. About 75 dolphins were in the program circa 2007, and around 70 dolphins and 30 sea lions were reported to be in the program in 2019.
The United States Navy implemented a program in 1960 to work with dolphins and sea lions in order to help with defense, mine detection, and the design of new submarines and new underwater weapons. The Navy did many tests with several marine mammals to determine which would be best for the jobs they needed done, with "more than 19 species...including some sharks and birds" tested, though the bottlenose dolphin and California sea lion were considered the best at what the Navy needed them for. The bottlenose dolphins' asset was their highly evolved biosonar, helping to find underwater mines, and the sea lions' asset was their impeccable underwater vision, which can help to detect enemy swimmers. In fiscal year 2007, the United States Navy spent $14 million on research on marine mammals as weapons and marine mammal training programs in object recovery and mine detection and have 75 trained dolphins. Dolphins have contributed to saving more lives in open water than specially trained life savers...
Training
The dolphins and sea lions are trained by five teams of the Navy's Marine Mammal fleet members. One team specializes in swimmer detection, three teams in mine location, and another team in object recoveries. The quick-response goal of this fleet is to mobilize a team and be on site within 72 hours. Dolphins are trained much as police dogs and hunting dogs are. They are given rewards such as fish on correct completion of a task. Dolphins are trained to detect underwater mines and enemy swimmers and then report back to their handlers. Rumours that dolphins had been trained to kill divers have been denied by the US Navy, which claims that training dolphins to fight or kill humans is impossible.
Retired US Admiral Tim Keating claimed that military dolphins could be used to detect mines in the Strait of Hormuz, after Iran threatened to close the waterway in January 2012...
https://en.wikipedia.org/wiki/United_States_Navy_Marine_Mammal_Program
The U.S. Navy Marine Mammal Program (NMMP) is a program administered by the U.S. Navy which studies the military use of marine mammals - principally bottlenose dolphins and California sea lions - and trains animals to perform tasks such as ship and harbor protection, mine detection and clearance, and equipment recovery. The program is based in San Diego, California, where animals are housed and trained on an ongoing basis. NMMP animal teams have been deployed for use in combat zones, such as during the Vietnam War and the Iraq War...
2021-02-16 21:15:39 +0000 UTC
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Silent, with title cards.
Originally a public domain film from the Library of Congress Prelinger Archives, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
https://en.wikipedia.org/wiki/California
Wikipedia license: http://creativecommons.org/licenses/by-sa/3.0/
California is a state in the Pacific Coast region of the United States. With over 39.3 million residents across a total area of approximately 163,696 square miles (423,970 km2), it is the most populous U.S. state and the third-largest by area, as well as the world's thirty-fourth-most-populous subnational entity. California is also the most populated subnational entity in North America, and has its state capital in Sacramento. The Greater Los Angeles area and the San Francisco Bay Area are the nation's second- and fifth-most-populous urban regions, with more than 18.7 million and 9.6 million residents respectively. Los Angeles is California's most populous city, and the country's second-most-populous, after New York City. California also has the nation's most populous county, Los Angeles County, and its largest county by area, San Bernardino County. The City and County of San Francisco is both the country's second most densely populated major city after New York City and the fifth-most-densely populated county, behind only four of the five New York City boroughs.
California's economy, with a gross state product of $3.2 trillion as of 2019, is the largest sub-national economy in the world. If it were a country, California would be the fifth-largest economy in the world, and the 37th-most populous as of 2020. The Greater Los Angeles area and the San Francisco Bay Area are the nation's second- and third-largest urban economies ($1.0 trillion and $0.5 trillion respectively as of 2020), after the New York metropolitan area ($1.8 trillion). The San Francisco Bay Area Combined Statistical Area had the nation's highest gross domestic product per capita in 2018 ($106,757) among large primary statistical areas, and is home to four of the world's ten largest companies by market capitalization and four of the world's ten richest people.
What is now California was first settled by various Native Californian tribes before being explored by a number of Europeans during the 16th and 17th centuries. The Spanish Empire then claimed and colonized it. In 1804 it was included in Alta California province, within the Viceroyalty of New Spain. The area became a part of Mexico in 1821 following its successful war for independence but was ceded to the United States in 1848 after the Mexican–American War. The western portion of Alta California was then organized and admitted as the 31st state on September 9, 1850 following the Compromise of 1850. The California Gold Rush starting in 1848 led to dramatic social and demographic changes, with large-scale emigration from the east and abroad with an accompanying economic boom... Although it accounts for only 1.5% of the state's economy, California's agriculture industry has the highest output of any U.S. state.
California shares a border with Oregon to the north, Nevada and Arizona to the east, and the Mexican state of Baja California to the south. The state's diverse geography ranges from the Pacific Coast and Metropolitan areas in the west to the Sierra Nevada mountain range in the east, and from the redwood and Douglas fir forests in the northwest, to the Mojave Desert endorheic basin in the southeast. The Central Valley, a major agricultural area, dominates the state's center. Although California is well-known for its warm Mediterranean climate and monsoon seasonal weather, the large size of the state results in climates that vary from moist temperate rainforest in the north to arid desert in the interior, as well as snowy alpine in the mountains. All these factors lead to an enormous demand for water; in total numbers, California is the largest consumer of water in North America. Over time, drought and wildfires have become more frequent; further straining California's water security...
2021-02-15 21:15:08 +0000 UTC
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COMBAT BULLETIN NO. 21...
PROGRESS IN SOUTHERN FRANCE
Originally a public domain film from the National Archives, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).
https://en.wikipedia.org/wiki/Operation_Dragoon
Wikipedia license: http://creativecommons.org/licenses/by-sa/3.0/
Operation Dragoon (initially Operation Anvil) was the code name for the landing operation of the Allied invasion of Provence (Southern France) on 15 August 1944. The operation was initially planned to be executed in conjunction with Operation Overlord, the Allied landing in Normandy, but the lack of available resources led to a cancellation of the second landing. By July 1944 the landing was reconsidered, as the clogged-up ports in Normandy did not have the capacity to adequately supply the Allied forces. Concurrently, the French High Command pushed for a revival of the operation that would include large numbers of French troops. As a result, the operation was finally approved in July to be executed in August.
The goal of the invasion was to secure the vital ports on the French Mediterranean coast and increase pressure on the German forces by opening another front. After some preliminary commando operations, the US VI Corps landed on the beaches of the Côte d'Azur under the shield of a large naval task force, followed by several divisions of the French Army B. They were opposed by the scattered forces of the German Army Group G, which had been weakened by the relocation of its divisions to other fronts and the replacement of its soldiers with third-rate Ostlegionen outfitted with obsolete equipment.
Hindered by Allied air supremacy and a large-scale uprising by the French Resistance, the weak German forces were swiftly defeated. The Germans withdrew to the north through the Rhône valley, to establish a stable defense line at Dijon. Allied mobile units were able to overtake the Germans and partially block their route at the town of Montélimar. The ensuing battle led to a stalemate, with neither side able to achieve a decisive breakthrough, until the Germans were finally able to complete their withdrawal and retreat from the town. While the Germans were retreating, the French managed to capture the important ports of Marseille and Toulon, soon putting them into operation.
The Germans were not able to hold Dijon and ordered a complete withdrawal from Southern France. Army Group G retreated further north, pursued by Allied forces. The fighting ultimately came to a stop at the Vosges mountains, where Army Group G was finally able to establish a stable defense line. After meeting with the Allied units from Operation Overlord, the Allied forces were in need of reorganizing and, facing stiffened German resistance, the offensive was halted on 14 September. Operation Dragoon was considered a success by the Allies. It enabled them to liberate most of Southern France in just four weeks while inflicting heavy casualties on the German forces, although a substantial part of the best German units were able to escape. The captured French ports were put into operation, allowing the Allies to solve their supply problems quickly...
2021-02-15 21:14:13 +0000 UTC
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Originally a public domain film from NASA, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).
https://en.wikipedia.org/wiki/International_Space_Station
Wikipedia license: http://creativecommons.org/licenses/by-sa/3.0/
The International Space Station (ISS) is a space station, or a habitable artificial satellite, in low Earth orbit. Its first component was launched into orbit in 1998, with the first long-term residents arriving in November 2000. It has been inhabited continuously since that date. The last pressurised module was fitted in 2011, and an experimental inflatable space habitat was added in 2016. The station is expected to operate until 2030. Development and assembly of the station continues, with several new elements scheduled for launch in 2020. The ISS is the largest human-made body in low Earth orbit and can often be seen with the naked eye from Earth. The ISS consists of pressurised habitation modules, structural trusses, solar arrays, radiators, docking ports, experiment bays and robotic arms. ISS components have been launched by Russian Proton and Soyuz rockets and American Space Shuttles.
The ISS serves as a microgravity and space environment research laboratory in which crew members conduct experiments in biology, human biology, physics, astronomy, meteorology, and other fields. The station is suited for the testing of spacecraft systems and equipment required for missions to the Moon and Mars. The ISS maintains an orbit with an average altitude of 400 kilometres (250 mi) by means of reboost manoeuvres using the engines of the Zvezda module or visiting spacecraft. It circles the Earth in roughly 92 minutes and completes 15.5 orbits per day.
The ISS programme is a joint project between five participating space agencies: NASA (United States), Roscosmos (Russia), JAXA (Japan), ESA (Europe), and CSA (Canada). The ownership and use of the space station is established by intergovernmental treaties and agreements. The station is divided into two sections, the Russian Orbital Segment (ROS) and the United States Orbital Segment (USOS), which is shared by many nations. As of January 2018, operations of the American segment were funded until 2025. Roscosmos has endorsed the continued operation of ISS through 2024, but has proposed using elements of the Russian segment to construct a new Russian space station called OPSEK.
The ISS is the ninth space station to be inhabited by crews, following the Soviet and later Russian Salyut, Almaz, and Mir stations as well as Skylab from the US. The station has been continuously occupied for 18 years and 216 days since the arrival of Expedition 1 on 2 November 2000. This is the longest continuous human presence in low Earth orbit, having surpassed the previous record of 9 years and 357 days held by Mir. It has been visited by astronauts, cosmonauts and space tourists from 18 different nations. After the American Space Shuttle programme ended in 2011, Soyuz rockets became the only provider of transport for astronauts at the ISS.
The station is serviced by a variety of visiting spacecraft: the Russian Soyuz and Progress, the American Dragon and Cygnus, the Japanese H-II Transfer Vehicle, and formerly the American Space Shuttle and the European Automated Transfer Vehicle...
2021-02-14 18:50:26 +0000 UTC
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Federal Aviation Administration, Civil Aerospace Medical Institute
Physiology of Flight: Spatial Disorientation, Part 2
Originally a public domain film from the National Archives, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).
https://en.wikipedia.org/wiki/Optical_illusion
Wikipedia license: http://creativecommons.org/licenses/by-sa/3.0/
An optical illusion (also called a visual illusion) is an illusion caused by the visual system and characterized by a visual percept that arguably appears to differ from reality. Illusions come in a wide variety; their categorization is difficult because the underlying cause is often not clear but a classification proposed by Richard Gregory is useful as an orientation. According to that, there are three main classes: physical, physiological, and cognitive illusions, and in each class there are four kinds: Ambiguities, distortions, paradoxes, and fictions. A classical example for a physical distortion would be the apparent bending of a stick half immerged in water; an example for a physiological paradox is the motion aftereffect (where, despite movement, position remains unchanged). An example for a physiological fiction is an afterimage. Three typical cognitive distortions are the Ponzo, Poggendorff, and Müller-Lyer illusion. Physical illusions are caused by the physical environment, e.g. by the optical properties of water. Physiological illusions arise in the eye or the visual pathway, e.g. from the effects of excessive stimulation of a specific receptor type. Cognitive visual illusions are the result of unconscious inferences and are perhaps those most widely known.
Pathological visual illusions arise from pathological changes in the physiological visual perception mechanisms causing the aforementioned types of illusions; they are discussed e.g. under visual hallucinations.
Optical illusions, as well as multi-sensory illusions involving visual perception, can also be used in the monitoring and rehabilitation of some psychological disorders, including phantom limb syndrome and schizophrenia....
2021-02-14 18:49:38 +0000 UTC
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