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The Shenyang J-31 (or "FC-31 fifth Generation Multi-Purpose light Fighter") also known as the "Gyrfalcon" (鹘鹰), or "Falcon Hawk" by some military enthusiasts, is a twin-engine, mid-size fifth-generation jet fighter currently under development by Shenyang Aircraft Corporation. The fighter has also been referred to as the "F-60" or "J-21 Snowy Owl" (雪鸮) in some media reports. Its official name is Shenyang FC-31; J-xx nomenclatures in the Chinese military are reserved to programs launched and financed by the army, while this plane was developed by a state-owned company.

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10 Nov 2022

Topic Review

A teapot is a vessel used for steeping tea leaves or a herbal mix in boiling or near-boiling water, and for serving the resulting infusion which is called tea. Dry tea is available either in tea bags or as loose tea, in which case a tea infuser or tea strainer may be of some assistance, either to hold the leaves as they steep or to catch the leaves inside the teapot when the tea is poured. Teapots usually have an opening with a lid at their top, where the dry tea and hot water are added, a handle for holding by hand and a spout through which the tea is served. Some teapots have a strainer built-in on the inner edge of the spout. A small air hole in the lid is often created to stop the spout from dripping and splashing when tea is poured. In modern times, a thermal cover called a tea cosy may be used to enhance the steeping process or to prevent the contents of the teapot from cooling too rapidly.

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10 Nov 2022

Biography

Robert S. Williamson

Robert Stockton Williamson (January 21, 1825 – November 10, 1882) was an American soldier and engineer, noted for conducting surveys for the transcontinental railroad in California and Oregon. Inducted into the Army Corps of Engineers in 1861, he had a distinguished record serving in the American Civil War, winning two brevet promotions. When the US Army Corps of Engineers established its San

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10 Nov 2022

Topic Review

Cigarette Filter

A cigarette filter is a component of a cigarette, along with cigarette paper, capsules and adhesives. It does not make cigarettes less unhealthy. The filter may be made from cellulose acetate fibre, paper or activated charcoal (either as a cavity filter or embedded into the cellulose acetate). Macroporous phenol-formaldehyde resins and asbestos have also been used in cigarette filters. The acetate and paper modify the particulate smoke phase by particle retention (filtration), and finely divided carbon modifies the gaseous phase (adsorption). Filters can reduce "tar" and nicotine smoke yields up to 50%, with a greater removal rate for other classes of compounds (e.g., phenols), but are ineffective in filtering toxins such as carbon monoxide. Most of these measured reductions occur only when the cigarette is smoked on a smoking machine; when a human smokes them, deliveries remain similar with or without a filter. Most factory-made cigarettes are equipped with a filter; those who roll their own can buy them from a tobacconist. The near-universal adoption of filters on cigarettes has not reduced harms to smokers; for instance, lung cancer rates have not declined. Filling a given length of cigarette with filter is cheaper than filling it with tobacco.

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10 Nov 2022

Topic Review

DIPROMISTO (Ukrainian: ДІПРОМІСТО) is a research and planning institute in the field of spatial and urban planning in Ukraine. It is a state enterprise within the field of governance of the Ministry of Regional Development, Construction and Housing of Ukraine. It was established on September 12, 1930. Its full name is State Enterprise Y.Bilokon Ukrainian State Scientific-Research Institute of Urban Design "DIPROMISTO". In Russian language sources it is also known as Giprograd (Russian: Гипроград). During Soviet times it was a system of planning institutes consisting of the central institute in Kyiv and a range of affiliates in oblasts' centres of USSR. In due time, most of the affiliates separated from the Dipromisto system into separate institutes. Currently the Institute has three affiliates: Ivano-Frankivsk, Rivne, and Volyn affiliates.

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Topic Review

Plug-In Electric Vehicles in the Netherlands

The adoption of plug-in electric vehicles in the Netherlands is actively supported by the Dutch government through the exemption of the registration fee and road taxes. These purchase incentives have been adjusted over time. Considering the potential of plug-in electric vehicles in the country due to its relative small size and geography, the Dutch government set a target of 15,000 to 20,000 electric vehicles with three or more wheels on the roads in 2015; 200,000 vehicles in 2020; and 1 million vehicles in 2025. The first two targets were achieved two years earlier than planned. The Dutch plug-in market was dominated by plug-in hybrids until 2016, when the tax rules changed after it became apparent many users rarely used the electric motors and only bought the cars for their tax advantage. In 2019, plug-in electric passenger cars had a market share of 14.9%, and rose to 24.6% in 2020, with battery electric vehicles dominating sales in both years. (As of December 2020), there were 297,380 highway-legal light-duty plug-in electric vehicles on the road in the Netherlands, consisting of 182,481 fully electric cars, 108,652 plug-in hybrids, and 6,247 all-electric light utility vans. (As of December 2012), the Netherlands was the country with the highest ratio of slow charging points to electric vehicles (EVSE/EV), with a ratio of more than 0.50, while the U.S had a slow EVSE/EV ratio of 0.20. The Netherlands' mix of slow and fast chargers has allowed it to become the country with the highest number of charging point per capita in the world. (As of December 2016), there were 11,768 public slow charging points available 24/7, 14,320 slow charging point with limited public access, 612 public and semi-public fast charging points, and over 72,000 private charging points.

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10 Nov 2022

Biography

Frederick W. Lander

Frederick William[1][2] Lander (December 17, 1821 – March 2, 1862) was a transcontinental United States explorer, general in the Union Army during the American Civil War, and a prolific poet. Lander was born in Salem, Massachusetts, the son of Edward and Eliza West Lander; his sister was the sculptor Louisa Lander. He was educated at Governor Dummer Academy, Phillips Academy, Andover and No

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10 Nov 2022

Topic Review

Adjustable-Speed Drive

Adjustable speed drive (ASD), also known as variable-speed drive (VSD), describes equipment used to control the speed of machinery. Many industrial processes such as assembly lines must operate at different speeds for different products. Where process conditions demand adjustment of flow from a pump or fan, varying the speed of the drive may save energy compared with other techniques for flow control. Where speeds may be selected from several different pre-set ranges, usually the drive is said to be adjustable speed. If the output speed can be changed without steps over a range, the drive is usually referred to as variable speed. Adjustable and variable speed drives may be purely mechanical (termed variators), electromechanical, hydraulic, or electronic.

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10 Nov 2022

Topic Review

ATi Radeon R100 Series

The Radeon R100 is the first generation of Radeon graphics chips from ATI Technologies. The line features 3D acceleration based upon Direct3D 7.0 and OpenGL 1.3, and all but the entry-level versions offloading host geometry calculations to a hardware transform and lighting (T&L) engine, a major improvement in features and performance compared to the preceding Rage design. The processors also include 2D GUI acceleration, video acceleration, and multiple display outputs. "R100" refers to the development codename of the initially released GPU of the generation. It is the basis for a variety of other succeeding products.

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10 Nov 2022

Topic Review

The Macchi C.202 Folgore (Italian "thunderbolt") was an Italian fighter aircraft developed and manufactured by Macchi Aeronautica. It was operated mainly by the Regia Aeronautica (RA; Royal (Italian) Air Force) in and around the Second World War. According to aviation author David Mondey, the Folgore has been considered to be one of the best wartime fighters to serve in large numbers with the Regia Aeronautica. The C.202 was designed by a team headed by the company's chief of design, Italian aeronautics engineer Mario Castoldi. As per company tradition, Macchi aircraft designed by Mario Castoldi received the "C" letter in their model designation, hence the Folgore is commonly referred to as the C.202 or MC.202. The C.202 was a development of the earlier C.200 Saetta, powered by an Italian-built version of the German Daimler-Benz DB 601Aa engine and featuring a redesigned fuselage for greater streamlining. During July 1941, the Folgore went into service with the Regia Aeronautica. In combat, it very quickly proved itself to be an effective and deadly dogfighter against its contemporaries. During its service life, the C.202 was deployed on all fronts in which Italy was involved. During late 1941, it commenced offensive operations over Malta and in North Africa, where Italian and German forces were engaged in heavy combat against British and later United States operations. The C.202 continued to be used in North Africa as late as mid-1943, by which point the type was withdrawn to support defensive efforts in Sicily and the Italian mainland following their invasion by Allied forces. It also saw limited use on the Eastern Front. Following the 1943 Armistice with Italy, the type was mostly used as a trainer aircraft. The type was also operated by Croatia. The Australian ace Clive Caldwell, who fought a wide variety of German, Italian and Japanese fighters during 1941–45, later stated that the C.202 was "one of the best and most undervalued of fighters". The C.202 also had its defects: like its predecessor, the C.200, it could enter a dangerous spin. The radios were unreliable, routinely forcing pilots to communicate by waggling their wings and Western historians regard the C.202 as insufficiently armed, being furnished with just a pair of machine guns that had a tendency for jamming. Still in mid-Summer 1942, in North Africa, the Folgore achieved a ratio kill/loss better than that of the Messerschmitt Bf 109s.

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