Ceramic Ball Bearing Performance Tests



A New Ball Bearing

INTRODUCTION:
Want to save a *million barrels of petroleum a day by simply changing to a more
efficient ball bearing in machinery? Sounds too good to be true, but it’s possible with
new materials available today.
Tribology – The science of friction and wear.
If we look at the surface finish of a metal ball or race very closely, peaks and valleys
appear over these surfaces. I ....etc

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abstract is below:

Abstract—We present an approach and a system to let tutors
monitor several important aspects related to on line tests, such
as learner behavior and test quality. The approach includes the
logging of important data related to learner interaction with the
system durin ....etc

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pls send me monitoring online tests through data visualization project for download ....etc

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NDT TESTS ON CONCRETE

Rebound Tests
The rebound hammer is a surface hardness tester for which an empirical
correlation has been established between strength and rebound number.
The only known instrument to make use of the rebound principle for
concrete testing is the Schmidt hammer, which weighs about 4 lb (1.8 kg)
and is suitable for both laboratory and field work. It consists of a springcontrolled
hammer mass that slides on a plunger within a tubular housing.
The hammer is forced against the surface of the concrete by ....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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Abstract
According to the relevant IEC standards vacuumcircuit-breakers have to meet various needs, e.g. theinterruption capability, making operations, and dielectricstrength. Switching of capacitor banks, overhead lines, orcables leads to very small currents in comparison withshort-circuit currents. After current interruption thecircuit-breaker must withstand twice the peak value of thesystem voltage. Furthermore, restrikes can lead to voltagemultiplication. The conjunction of relatively smallbreaking currents with high voltage stress ....etc

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