Snow removal

Snow removal or snow clearing is the job of removing snow after a snowfall to make travel easier and safer. This is done by both individual households and by governments and institutions.

De-icing and anti-icing

De-icing is defined as removal of existing snow, ice or frost from a roadway, airport runway, or other surface. It includes both mechanical means (plowing or scraping) or chemical application of salt or other ice melting chemicals. Anti-icing is treatment with ice melting chemicals before or during the beginning a storm, to prevent or delay the formation of ice, or the adhesion of ice and snow to the surface. Brine or wetted salt is usually applied shortly before a snowstorm arrives. Properly performed, anti-icing can significantly reduce the amount of salt required, and allows easier removal by mechanical methods (snowplows).

De-icing of roads has traditionally been done with salt, spread by snowplows or dump trucks designed to spread it, often mixed with sand and gravel, on slick roads. Sodium chloride (rock salt) is normally used, as it is inexpensive and readily available in large quantities. However, since salt water still freezes at −18 °C or 0 °F, it is of no help when the temperature falls below this point. It also has a strong tendency to cause corrosion: rusting the steel used in most vehicles and the rebar in concrete bridges. More recent snowmelters use other salts, such as calcium chloride and magnesium chloride, which not only depress the freezing point of water to a much lower temperature, but also produce an exothermic reaction. They are somewhat safer for concrete sidewalks, but excess should still be removed.

Snow

Snow is precipitation in the form of flakes of crystalline water ice that falls from clouds.

Since snow is composed of small ice particles, it is a granular material. It has an open and therefore soft, white, and fluffy structure, unless subjected to external pressure. Snowflakes come in a variety of sizes and shapes. Types that fall in the form of a ball due to melting and refreezing, rather than a flake, are hail, ice pellets or snow grains.

The process of precipitating snow is called snowfall. Snowfall tends to form within regions of upward movement of air around a type of low-pressure system known as an extratropical cyclone. Snow can fall poleward of these systems' associated warm fronts and within their comma head precipitation patterns (called such due to the comma-like shape of the cloud and precipitation pattern around the poleward and west sides of extratropical cyclones). Where relatively warm water bodies are present, for example because of water evaporation from lakes, lake-effect snowfall becomes a concern downwind of the warm lakes within the cold cyclonic flow around the backside of extratropical cyclones. Lake-effect snowfall can be heavy locally. Thundersnow is possible within a cyclone's comma head and within lake effect precipitation bands. In mountainous areas, heavy snow is possible where upslope flow is maximized within windward sides of the terrain at elevation, if the atmosphere is cold enough. Snowfall amount and its related liquid equivalent precipitation amount are measured using a variety of different rain gauges.

Mega Machines

Mega Machines is a series of 4 Video releases by Cinema Club (2 Entertain) April 3, 1995 to August 1995 on VHS and 2002 on DVD and created by SR Production 1994. The videos follows four sectors of machines showing how they work and what they are use for. The Sector's is as Follows

The program was narrated by John Leslie and was directed by Richard Duplock

VHS Release

DVD Release

References

External links

Epik High

Epik High (Hangul: 에픽하이) is a South Korean alternative hip hop group from Seoul, composed of Tablo, Mithra Jin and DJ Tukutz. The group is known for combining different styles of hip hop, along with different musical genres and collaborations on each album. The group went on hiatus from 2009–2012 whilst members served individual mandatory military service. On July 25, 2012, YG Entertainment announced that they would sign Mithra Jin and DJ Tukutz (Tablo already being signed as he had a solo album under YG) and the group returned with their seventh studio album 99 on October 23, 2012.

History

2003-2005: Early Days

Epik High was relatively unknown early in their career due to hip-hop's lack of popularity in Korea. They were performing with other groups like "CB Mass" to gain popularity in the underground hip-hop scene. They also became members of the "Movement Crew", one of the largest hip-hop crews in South Korea. Their debut album, Map of the Human Soul was released in 2003. However success only began with the release of their second album, titled High Society.

The Power

The Power may refer to: