|
Artificial Snow
Snowmaking is the production of snow by forcing water and pressurized air through a "snow gun", also known as a "snow cannon". Snowmaking is mainly used at ski resorts to supplement natural snow. This allows ski resorts to improve the reliability of their snow cover and to extend their ski seasons from late autumn to early spring. Indoor ski slopes use snowmaking. They can generally do so year-round as they have climate-controlled environments. The use of snowmaking machines has become more common as changing weather patterns and the popularity of indoor ski resorts create a demand for snow beyond that which is provided by nature. Snowmaking machines have addressed the shortage in the supply of snow; however, there are significant environmental costs associated with the artificial production of snow. According to the European Environment Agency, the length of snow seasons in the northern hemisphere has decreased by five days each decade since the 1970s, thus increasing the deman ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bacterial Ice-nucleation Proteins
Bacterial ice-nucleation proteins is a family of proteins that enable Gram-negative bacteria to promote nucleation of ice at relatively high temperatures (above -5C). These proteins are localised at the outer membrane surface and can cause frost damage to many plants. The primary structure of the proteins contains a highly repetitive domain that dominates the sequence. The domain comprises a number of 48-residue Residue may refer to: Chemistry and biology * An amino acid, within a peptide chain * Crop residue, materials left after agricultural processes * Pesticide residue, refers to the pesticides that may remain on or in food after they are applied ... repeats, which themselves contain 3 blocks of 16 residues, the first 8 of which are identical. It is thought that the repetitive domain may be responsible for aligning water molecules in the seed crystal. ........48.residues.repeated.domain.......... / / , , \ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fahrenheit
The Fahrenheit scale () is a temperature scale based on one proposed in 1724 by the physicist Daniel Gabriel Fahrenheit (1686–1736). It uses the degree Fahrenheit (symbol: °F) as the unit. Several accounts of how he originally defined his scale exist, but the original paper suggests the lower defining point, 0 °F, was established as the freezing temperature of a solution of brine made from a mixture of water, ice, and ammonium chloride (a salt). The other limit established was his best estimate of the average human body temperature, originally set at 90 °F, then 96 °F (about 2.6 °F less than the modern value due to a later redefinition of the scale). For much of the 20th century, the Fahrenheit scale was defined by two fixed points with a 180 °F separation: the temperature at which pure water freezes was defined as 32 °F and the boiling point of water was defined to be 212 °F, both at sea level and under standard atmospheric pressu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Celsius
The degree Celsius is the unit of temperature on the Celsius scale (originally known as the centigrade scale outside Sweden), one of two temperature scales used in the International System of Units (SI), the other being the Kelvin scale. The degree Celsius (symbol: °C) can refer to a specific temperature on the Celsius scale or a unit to indicate a difference or range between two temperatures. It is named after the Swedish astronomer Anders Celsius (1701–1744), who developed a similar temperature scale in 1742. Before being renamed in 1948 to honour Anders Celsius, the unit was called ''centigrade'', from the Latin ''centum'', which means 100, and ''gradus'', which means steps. Most major countries use this scale; the other major scale, Fahrenheit, is still used in the United States, some island territories, and Liberia. The Kelvin scale is of use in the sciences, with representing absolute zero. Since 1743 the Celsius scale has been based on 0 °C for the freezing ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fan (mechanical)
A fan is a powered machine used to create a flow of air. A fan consists of a rotating arrangement of vanes or blades, generally made of wood, plastic, or metal, which act on the air. The rotating assembly of blades and hub is known as an '' impeller'', ''rotor'', or ''runner''. Usually, it is contained within some form of housing, or case. This may direct the airflow, or increase safety by preventing objects from contacting the fan blades. Most fans are powered by electric motors, but other sources of power may be used, including hydraulic motors, handcranks, and internal combustion engines. Mechanically, a fan can be any revolving vane, or vanes used for producing currents of air. Fans produce air flows with high volume and low pressure (although higher than ambient pressure), as opposed to compressors which produce high pressures at a comparatively low volume. A fan blade will often rotate when exposed to an air-fluid stream, and devices that take advantage of this, su ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Compressed Air
Compressed air is air kept under a pressure that is greater than atmospheric pressure. Compressed air is an important medium for transfer of energy in industrial processes, and is used for power tools such as air hammers, drills, wrenches, and others, as well as to atomize paint, to operate air cylinders for automation, and can also be used to propel vehicles. Brakes applied by compressed air made large railway trains safer and more efficient to operate. Compressed air brakes are also found on large highway vehicles. Compressed air is used as a breathing gas by underwater divers. It may be carried by the diver in a high pressure diving cylinder, or supplied from the surface at lower pressure through an air line or diver's umbilical. Similar arrangements are used in breathing apparatus used by firefighters, mine rescue workers and industrial workers in hazardous atmospheres. In Europe, 10 percent of all industrial electricity consumption is to produce compressed air—am ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nozzle
A nozzle is a device designed to control the direction or characteristics of a fluid flow (specially to increase velocity) as it exits (or enters) an enclosed chamber or pipe. A nozzle is often a pipe or tube of varying cross sectional area, and it can be used to direct or modify the flow of a fluid (liquid or gas). Nozzles are frequently used to control the rate of flow, speed, direction, mass, shape, and/or the pressure of the stream that emerges from them. In a nozzle, the velocity of fluid increases at the expense of its pressure energy. Types Jet A gas jet, fluid jet, or hydro jet is a nozzle intended to eject gas or fluid in a coherent stream into a surrounding medium. Gas jets are commonly found in gas stoves, ovens, or barbecues. Gas jets were commonly used for light before the development of electric light. Other types of fluid jets are found in carburetors, where smooth calibrated orifices are used to regulate the flow of fuel into an engine, and in jacuzzis or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Snow Cannon Pagla Boden
Snow comprises individual ice crystals that grow while suspended in the atmosphere—usually within clouds—and then fall, accumulating on the ground where they undergo further changes. It consists of frozen crystalline water throughout its life cycle, starting when, under suitable conditions, the ice crystals form in the atmosphere, increase to millimeter size, precipitate and accumulate on surfaces, then metamorphose in place, and ultimately melt, slide or sublimate away. Snowstorms organize and develop by feeding on sources of atmospheric moisture and cold air. Snowflakes nucleate around particles in the atmosphere by attracting supercooled water droplets, which freeze in hexagonal-shaped crystals. Snowflakes take on a variety of shapes, basic among these are platelets, needles, columns and rime. As snow accumulates into a snowpack, it may blow into drifts. Over time, accumulated snow metamorphoses, by sintering, sublimation and freeze-thaw. Where the climate is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canmore, Alberta
Canmore is a town in Alberta, Canada, located approximately west of Calgary near the southeast boundary of Banff National Park. It is located in the Bow Valley within Alberta's Rocky Mountains. The town shares a border with Kananaskis Country to the west and south and the Municipal District of Bighorn No. 8 to the north and east. With a population of 14,798 in 2020, Canmore is the ninth-largest town in Alberta. History Canmore was officially named in 1884 by Canadian Pacific Railway director Donald A. Smith (later 1st Baron Strathcona and Mount Royal). It was named after Malcolm III of Scotland who was also nicknamed Canmore. Canmore is Gaelic for "Big Chief". In 1886, Queen Victoria granted a coal mining charter to the town, and the No. 1 mine was opened in 1887. By the 1890s, a North-West Mounted Police barrack had been instated on Main Street, but it was vacated in 1927. The building was restored in 1989 and it is under the care of the Canmore Museum and Geoscience ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Smiggin Holes, New South Wales
Smiggin Holes is a village in the ski resort area of Snowy Mountains of New South Wales, Australia, in the Snowy Monaro Regional Council. It is primarily a winter-only resort village. It is within the Kosciuszko National Park, and is administered by New South Wales Department of Environment and Climate Change. Access to the village is via road. There is an access fee payable to the national park, and motor vehicles are not permitted to stay overnight in the winter months. Smiggin Holes is one of four villages making up the Perisher Ski Resort. It is situated above sea level. The name Smiggin Holes is of Scottish origin. The trampling of hundreds of cattle consuming rock salt that graziers had placed there, caused depressions that filled with water. These depressions were called "the smiggin holes". The year 1939 signified the start of Smiggin Holes as a destination for skiers. Smiggin Holes is widely regarded as one of the best beginners' ski resorts on the Australian snowfie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spiegel Online
''Der Spiegel (online)'' is a German news website. Before the renaming in January 2020, the website's name was ''Spiegel Online'' (short ''SPON''). It was founded in 1994 as the online offshoot of the German news magazine, '' Der Spiegel'', with a staff of journalists working independently of the magazine. Today, it is the most frequently quoted online media product in Germany. ''Spiegel Online International'', a section featuring articles translated into English, was launched in autumn 2004. In 2019, its editorial office was merged with the one of the printed Spiegel and in 2020, the website was renamed accordingly. Company and editorial staff The news website ''Der Spiegel (online)'' is run by Der Spiegel GmbH & Co. KG (formerly Spiegel Online GmbH & Co. KG), itself a wholly owned subsidiary of Spiegel-Verlag. The editorial offices of the news website and the print magazine '' Der Spiegel'' were separate operations, that had their own offices, authors and content until Janua ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
