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วันอังคารที่ 16 กันยายน พ.ศ. 2557

Hail

Hail is a form of solid precipitation. It is distinct from sleet, though the two are often confused for one another. It consists of balls or irregular lumps of ice, each of which is called a hailstone. Sleet falls generally in cold weather while hail growth is greatly inhibited at cold temperatures. Unlike graupel, which is made of rime, and ice pellets, which are smaller and translucent, hailstones consist mostly of water ice and measure between 5 millimetres (0.2 in) and 15 centimetres (6 in) in diameter. The METAR reporting code for hail 5 mm (0.20 in) or greater is GR, while smaller hailstones and graupel are coded GS. Hail is possible within most thunderstorms as it is produced bycumulonimbi, and within 2 nautical miles (3.7 km) of the parent storm. Hail formation requires environments of strong, upward motion of air with the parent thunderstorm (similar to tornadoes) and lowered heights of the freezing level. In the mid-latitudes, hail forms near theinteriors of continents, while in the tropics, it tends to be confined to high elevations.

There are methods available to detect hail-producing thunderstorms using weather satellites and weather radar imagery. Hailstones generally fall at higher speeds as they grow in size, though complicating factors such as melting, friction with air, wind, and interaction with rain and other hailstones can slow their descent through Earth's atmosphere. Severe weather warnings are issued for hail when the stones reach a damaging size, as it can cause serious damage to human-made structures and, most commonly, farmers' crops.

Rain

Rain is liquid water in the form of droplets that have condensed from atmospheric water vapor and then precipitated—that is, become heavy enough to fall under gravity. Rain is a major component of the water cycle and is responsible for depositing most of the fresh water on the Earth. It provides suitable conditions for many types of ecosystems, as well as water forhydroelectric power plants and crop irrigation.

The major cause of rain production is moisture moving along three-dimensional zones of temperature and moisture contrasts known as weather fronts. If enough moisture and upward motion is present, precipitation falls from convective clouds (those with strong upward vertical motion) such as cumulonimbus (thunder clouds) which can organize into narrow rainbands. In mountainous areas, heavy precipitation is possible where upslope flow is maximized within windward sides of the terrain at elevation which forces moist air to condense and fall out as rainfall along the sides of mountains. On the leeward side of mountains, desert climates can exist due to the dry air caused by downslope flow which causes heating and drying of the air mass. The movement of the monsoon trough, or intertropical convergence zone, brings rainy seasons to savannah climes.

The urban heat island effect leads to increased rainfall, both in amounts and intensity, downwind of cities. Global warming is also causing changes in the precipitation pattern globally, including wetter conditions across eastern North America and drier conditions in the tropics. Antarctica is the driest continent. The globally averaged annual precipitation over land is 715 mm (28.1 in), but over the whole Earth it is much higher at 990 mm (39 in). Climate classification systems such as the Köppen climate classification system use average annual rainfall to help differentiate between differing climate regimes. Rainfall is measured using rain gauges. Rainfall amounts can be estimated by weather radar.

Rain is also known or suspected on other planets, where it may be composed of methane, neon, sulfuric acid or even ironrather than water.

Earthquake

An earthquake is the result of a sudden release of energy in the Earth's crustthat creates seismic waves. The seismicity, seismism or seismic activity of an area refers to the frequency, type and size of earthquakes experienced over a period of time.

Earthquakes are measured using observations from seismometers. The moment magnitude is the most common scale on which earthquakes larger than approximately 5 are reported for the entire globe. The more numerous earthquakes smaller than magnitude 5 reported by national seismological observatories are measured mostly on the local magnitude scale, also referred to as the Richter scale. These two scales are numerically similar over their range of validity. Magnitude 3 or lower earthquakes are mostly almost imperceptible or weak and magnitude 7 and over potentially cause serious damage over larger areas, depending on their depth. The largest earthquakes in historic times have been of magnitude slightly over 9, although there is no limit to the possible magnitude. The most recent large earthquake of magnitude 9.0 or larger was a 9.0 magnitude earthquake in Japan in 2011 (as of March 2014), and it was the largest Japanese earthquake since records began. Intensity of shaking is measured on the modified Mercalli scale. The shallower an earthquake, the more damage to structures it causes, all else being equal.

At the Earth's surface, earthquakes manifest themselves by shaking and sometimes displacement of the ground. When theepicenter of a large earthquake is located offshore, the seabed may be displaced sufficiently to cause a tsunami. Earthquakes can also trigger landslides, and occasionally volcanic activity.

In its most general sense, the word earthquake is used to describe any seismic event — whether natural or caused by humans — that generates seismic waves. Earthquakes are caused mostly by rupture of geological faults, but also by other events such as volcanic activity, landslides, mine blasts, and nuclear tests. An earthquake's point of initial rupture is called its focus orhypocenter. The epicenter is the point at ground level directly above the hypocenter.

วันเสาร์ที่ 13 กันยายน พ.ศ. 2557

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 known as 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 withinwindward 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.

football

Football refers to a number of sports that involve, to varying degrees, kicking a ball with the foot to score a goal. The most popular of these sports worldwide is association football, more commonly known as just "football" or "soccer". Unqualified, the word football applies to whichever form of football is the most popular in the regional context in which the word appears, including association football, as well as American football, Australian rules football, Canadian football, Gaelic football, rugby league, rugby union, and other related games. These variations of football are known as football codes.

Various forms of football can be identified in history, often as popular peasant games. Contemporary codes of football can be traced back to the codification of these games at English public schools in the eighteenth and nineteenth centuries. The influence and power of the British Empire allowed these rules of football to spread to areas of British influence outside of the directly controlled Empire, though by the end of the nineteenth century, distinct regional codes were already developing: Gaelic Football, for example, deliberately incorporated the rules of local traditional football games in order to maintain their heritage. In 1888, The Football League was founded in England, becoming the first of many professional football competitions. During the twentieth century, several of the various kinds of football grew to become among the most popular team sports in the world.

วันศุกร์ที่ 12 กันยายน พ.ศ. 2557

computer network

Computer Network

What is a Computer Network

Computer Network is a computer network system. Which represents a connection between two or more computers together with cables. Or other Enable computers to transmit data to each other. Where there is a connection between multiple computers. Machine to a large central computer. We call that central host computer (Host) and a small computer connected to the client (Client / Terminal).

Network (Network) to link computers together to communicate. We can deliver information within Or across the city to the other side of the world. The information Can be either text, pictures, sounds, causing inconvenience. Easy to use This capability makes these computer networks are important. And the need to operate in different industry.
There are three forms of network looks like.
1. LAN (Local Area Network)?, A group of computers connected together in a limited space. For example, within an office building, or in the factory. Cables are used to communicate.
2. MAN (Metropolitan Area Network)? Was bringing many LAN-LAN with adjacent areas are connected, to a larger size. Such interconnected in Or in the provinces,
3.WAN (Wide Area Network)?, A group of computers connected by a space. May be in the country or in the country to use a LAN or a MAN is in a different area? Connected together at the New York offices connected with the London communications. May use the telephone line, until the satellite.
- There may be another type of SAN (Small Area Network)?, A group of computers connected together in a very small space. May be in the home or to the office with a small number of computers should not exceed 10.

credit: 7562a.blogspot.com

วันอังคารที่ 5 สิงหาคม พ.ศ. 2557

google

Google

Google is American Public Company.Most revenue is from advertisement that appears in search engine of google ,email ,map online ,video online.The google office is located in Mountain View,California.There are 16805 employees.

    กูเกิลเป็นบริษัทมหาชนอเมริกัน รายได้ส่วนใหญ่มาจากโฆษณาที่ปรากฏในเสิร์ชเอนจินของกูเกิล    อีเมล แผนที่ออนไลน์ วิดิโออนไลน์ สำนะกงานใหญ่ของกูเกิลตั้งอยู่ที่ เมาน์เทนวิว รัฐแคลิฟอร์เนีย มีพนักงานทั้งหมด 16805 คน

   Google was founded by Larry Page and Sergey Brin while they were Ph.D. students at Stanford University. Together they own about 14 percent of its shares but control 56 of the stockholder voting power through supervoting stock. They incorporated Google as a privately held company on September 4, 1998. An initial public offering followed on August 19, 2004. Its mission statement from the outset was "to organize the world's information and make it universally accessible and usefuland its unofficial slogan was "Don't be evil."
กูเกิลก่อตั้งโดย แลร์รี เพจ และ เซอร์เกย์ บริน ขณะที่ทั้งคู่กำลังศึกษาอยู่ที่มหาวิทยาลัยสแตนฟอร์ดซึ่งภายหลังทั้งคู่ได้ก่อตั้งบริษัทเมื่อวันที่ 4 กันยายน พ.ศ. 2541 ในโรงจอดรถของเพื่อนที่ เมืองแมนโลพาร์ก ในรัฐแคลิฟอร์เนีย และมีการเสนอขายหุ้นใหม่แก่ประชาชนทั่วไปเป็นครั้งแรก เมื่อ 19 สิงหาคม พ.ศ. 2547 เพิ่มมูลค่าของบริษัท 1.67 พันล้านดอลลาร์สหรัฐ และหลังจากนั้นทางกูเกิลได้มีการขยายตัวตลอดเวลาจากการพัฒนาซอฟต์แวร์ใหม่และการซื้อกิจการอื่นรวมเข้ามา กูเกิลได้ถูกจัดอันดับให้เป็นบริษัทที่น่าทำงานมากที่สุดในสหรัฐอเมริกาโดยนิตยสารฟอร์จูน ซึ่งมีคติพจน์ประจำบริษัทคือ Don't be evil อย่างไรก็ตามทางบริษัทได้รับการวิพากษ์วิจารณ์ในด้านการละเมิดข้อมูลส่วนตัว การละเมิดลิขสิทธิ์ และการเซ็นเซอร์ในหลายส่วน

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