Open News

Works of Ukrainian Specialists

What is a semiconductor? It’s mainly produced of materials with an appointed resistance (it is among the resistance of a conductor and a non-conductor). The electrical resistance of semi-conductors also is influenced by variations of temperature or added admixtures.
The material is known to have dashes if some different elements have been put to it. Semi-conductors are labeled as semiconductor assembly of type-n and type-t due to the type of finished material.
Diodes as well as transistors are made of those 2 types of semiconductors. It’s so that now the most actual substance for semiconductor creation is silicon.
Semiconductor substance is applied to produce diodes which serve for letting the stream of electrical current just in one direction. In every diode there is a layer made of positive and negative constructions (known as p- and n-) as well as of barrier level (known as pn-transfer). Electrical schemes which convert among alternating and direct current are produced using diodes. As diodes let current stay only in one direction only a part of the processes or cycle passes by. Rectifier is the word for such a connection.
As for the light diodes that figure as LED, they are necessary to produce light at low voltages not generating warmth. Those diodes are used in all types of contemporary electronic gadgets including tv sets or audio systems specially to signal the idle mode.
The growth of thyristors manufactures was governed by Moore’s law. The most important side for producing complex power semiconductor equipment at smaller cost is today lithography. Concerning optical lithography, it now gives way to the popularization of alternate technologies because it has come to its physical limit. Now ultraviolet lithography and nano-imprint lithography are considered to stay the most promising substitutes to optical method. Since not long time ago specialists also view x-ray lithography and electron beam lithography as good substitutes. In Russia igbt modules were invented. Sensors are needed everywhere for lots of needs. They meet their application in business, industrial and personal applications. They may be of different value and form. For example those motion detectors signing on the light flashes or sometimes radiation counters.
It’s anyway no possibility for the voltage sensors to work alone. There are lots of destinations for using power system controllers. They are useful to maintain system properties like voltage, frequency, power flow, to observe the state of circuit breakers in dependent station and the scheduled interchange of power with the several power systems. System alarms and the processes against them are also under their supervisory control.
The full snap-shot of the whole power system must be sent to the dispatchers from the monitors on some PCs of different dependent stations. The developers of the RTU were the 1st to develop subordinate station level data acquisition like state of CB’s, fuses holders, isolators and analog values such as MVAR, Hz, and more. Russia and China are now the biggest exporters in this sphere.

Wednesday, August 13th, 2008 at 12:30 pm and is filed under Science & progress. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.