The use of restivity to determine the level of contaminant in groundwater ....etc

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Presented By:
H-L Lin1, T Chou2, and C-P Chou2
Department of Vehicle Engineering, Army Academy R.O.C
Abstract:
Many parameters affect the quality of the resistance spot welding (RSW) process. It is not easy to obtain optimal parameters of the RSW process in the automobile industry. Conventionally, the Taguchi method has been widely used in engineering; however, with this method the desired results can only be obtained with the use of very discrete control factors, thus leading to uncertainty about the real optimum. In the process ....etc

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SEMINER PRESENTATION ON ELECTRICAL RESISTIVITY TOMOGRAPHY ....etc

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RESISTANCE THERMOMETER THEORY AND PRACTICE


BASIC THEORY
The electrical conductivity of a metal depends on the movement of electrons through its
crystal lattice. Due to thermal excitation, the electrical resistance of a conductor varies
according to its temperature and this forms the basic principals of resistance thermometry.
The effect is most commonly exhibited as an increase in resistance with increasing
temperature, a positive temperature coefficient of resistance.


....etc

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download pdf file of to study and compare the internal resistance and e m f of diffre ....etc

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Resistance Measurements and Interpretations Relating to Flashover
of Artificially Contaminated Ceramic Insulator Strings
Abstract
The flashover of insulator strings occurring at normal working voltages under contaminated/polluted conditions, obviously deserves serious consideration. Though much researchhas been gone into pollution-induced flashover phenomena but grey areas still exist in our knowledge.In the present experimental study the breakdown (flashover) voltages across gaps on insulatortop surfaces and gaps ....etc

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One of the most common and difficult problems to solve in industrial power systems is the location and elimination of ground fault. Ground faults that occur in ungrounded and high resistance grounded systems do not draw enough current to trigger circuit breaker or fuse operation, making them difficult to localize.

Techniques currently used to track down faults are time consuming and cumbersome. A new approach developed for ground fault localization on ungrounded and high resistance grounded low voltage systems is described. The system consi ....etc

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please give me the complete seminar report
....etc

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CONDUCTIVITY σ ,FERMI LEVEL ,
MEAN FREE PATH &
RELAXATION TIME ť
FOR TYPICAL MONO-VALENT METALS
IS SHOWN IN TABLE

The conductivity σ may be obtained experimentally .
Further we can get ť by using eqn given below
σ = ( n*Qe2 *ť )/me ---------(1)
but ť obtained may not be accurate but we will get an idea of magnitude of ť . In a monovalent metal no of free e- /m3 is equals the no of atoms /m3 . From table we find that relaxation time T is of the order of 10-14 sec .Thus we can ....etc

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i want a seminar report on this topic i know that
it already exist on this forum but the info given there is very little.so please help me out
[email protected] ....etc

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