|
Home / News / Tags / current
|
|
Spot welding is a technique generally used to bond metals shaped into sheets no thicker than 3 millimeters. Unlike other welding techniques, spot welding can create precise bonds without generating excessive heating that can affect the properties of the rest of the sheet. This is achieved by delivering a large amount... |
2 August 2008
06:26 GMT |
 |
|
Magnetos are generally used to generate extremely high voltages for small internal combustion engines, such as those equipping chainsaws, small cars and even small airplanes. The engine of the Cessna 152 airplane for example, has an ignition system using a magneto to increase engine reliability. The output voltage ge... |
19 May 2008
06:52 GMT |
|
|
The ampere is one of the seven base units of the International System of Units, and while it is one of the electric units, its definition does not directly tie it to the others. Therefore, the ampere is the electrical constant current, circulated through two parallel infinite conductors placed in void, at a distance ... |
20 December 2007
08:40 GMT |
|
|
Butterflies are renowned usually for their beauty. But amongst the 750 species of butterfly encountered in US and Canada, this is the most known worldwide, due to its amazing migration records. The black and orange beauty bears the name of monarch butterfly because the first English settlers of America associated it ... |
14 November 2007
14:11 GMT |
|
|
A newly developed technology could revolutionize most optical devices, making them much more adaptable, yet smaller and cost-effective. The variable liquid lenses and mirrors may one day replace conventional ones in camera phones, for instance, as they have no mechanical parts - thus taking less space - but maintain... |
23 July 2007
11:10 GMT |
|
|
First, let's see what you did know about lightning. You probably know that it's an atmospheric discharge of electricity, occurring during rain storms. You're right. Now let's see if you also knew this:1 - Lightning can form without rain storms.Yes, it's true. Lightning can also occur during v... |
30 June 2007
07:10 GMT |
|
|
Superconductivity is a phenomenon occurring in certain materials at extremely low temperatures, characterized by exactly zero electrical resistance and the exclusion of the interior magnetic field. They are thought to appear usually below -140 degrees Celsius. Superconductors are used in many applications, like MRI ... |
20 June 2007
02:50 GMT |
|
|
Light sensors come in many shapes and sizes, and are also called photodetectors. Some of the most known examples are photocells, photodiodes and phototransistors, which are usually quantum devices in which an individual photon produces a discrete effect.Now, a team of scientists at Oxford University and Duke Univers... |
15 June 2007
11:13 GMT |
|
|
Lenses are used to converge or diverge light in various optical and electronic devices and the first written records of the use of a lens date to Ancient Greece, in 424 BC. The optical zoom lenses in professional television cameras can have a magnification ratio as high as 100x.Constructing a lens that does not chan... |
14 June 2007
12:17 GMT |
|
|
The Sargasso Sea is an elongated region in the middle of the North Atlantic Ocean, surrounded by ocean currents: on the west by the Gulf Stream, on the north, by the North Atlantic Current, on the east, by the Canary Current and on the south, by the North Atlantic Equatorial Current. It is about 700 miles wide and 2,... |
23 May 2007
03:40 GMT |
|
|
The waters of the Southern Ocean are cold, remote and difficult to study, posing many questions, still unanswered. A team led by Alberto Naveira Garabato of the National Oceanography Centre, Southampton has solved one issue: the researchers studied the ocean circulation in the current that flows around Antarctica by ... |
11 May 2007
17:06 GMT |
|
|
|
|
