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shape memory alloys a group of metallic materials that can return to some previously defined shape or size when subjected to the appropriate thermal
fullerene the fullerene is a cage like hollow molecules composed of hexagonal and pentagonal groups of atoms and especially those formed from
an inter metallic compound having the chemical formula a3b where a represents a transition element and a crystal structure in which the b atoms are
electrical machines efforts are being made at present to develop electrical machines and transformers utilising super conductivity calculators. it
applications of superconductors -1. electrical machines 2. power cables3. electro magnets 4. amplifiers5. cryotron6. magnetic leviation7. a 15
squids or super conducting quantum interference devices are used to measure minute changes in magnetic flux by means of a pair of josephson
the josephson effect is a term given to the phenomenon of current flow across two superconductors separated by a very thin insulating barrier. this
super conductivity has long been a staple of science fiction one of the first mentions of the phenomenon occurred in robert a heinleinrsquos
1 the current in a super conductor once set up continuous for a very long time without
type 1 and type 2 superconductors for one group of superconductor in which below hc is in the meissner state where it excludes all the magnetic
introduction superconductivity is a phenomenon takes place in certain materials at low temperatures. characterized by precisely zero electrical
effect of field on superconductivity critical magnetic field hc is the maximum field that can be applied to a superconductor without destroying the
the schottky diodes are a semiconductor diode with a low forward voltage drop and a very fast switching action. the voltage drop at forward
a tunnel diode is a highly conductively two terminal p-n junction doped heavily about 1000 layer width is a high conductively two terminal
organic amp polymer solar cells are made from thin films typically 100nm of organic semiconductor such as polymer and small molecule compounds
thin film technologiesthe various thin technologies currently being developed reduce the amount of light absorbing material required in creating a
bulk technologies the bulk technologies are often known as wafer-based manufacturing. in other words in each of these approaches self-supporting
zener diode it is a two terminal semiconductor junction device with a very sharp voltage breakdown at reverse bias applied. the device is
all solar cells require a light absorbing material contained within the cell structure to absorb photons and generate electrons via the photo voltaic
a solar cell or photo voltaic cell is a semiconductor device that converts photons from the sun into electricity. it can also be defined as a
gallium phospide it has band gap of 2.3ev. it can be used for light emitting diodes which can emit green or red light. the red light is
it has large energy gap 3.0ev and is regarded as high temperature semiconductor. it is extremely refectory subliming in the region of 28000c. because
energy gap 2.4ev. the colour of pure cadmium sulphide is pale yellow. it melts only under at high temperature. it can be prepared in the
energy gap 1.4ev at room temperatureits charactistics are very closely related to those of germanium. this is under stable since gallium is the
melting point 5250c.it has small band gap and very high mobility around 70000cm2v-sec. it has much easier to prepare in single crystal from the