experience that I have gained to learn and achieve more in this field. Weak localization is a physical effect which occurs in disordered electronic systems at very low temperatures. The effect manifests itself as a positive correction to the resistivity of a metal or semiconductor. The effect is quantum-mechanical in nature and has the following origin: In a disordered electronic system‚ the electron motion is diffusive rather than ballistic. That is‚ an electron does not move along a straight
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then able to find the cross-section area using the following formula. A(y)=(pi/4)xD(y)^2. The resistance of wire also is related inversely to the diameter of said wire. The resistivity for copper varies with temperature. The resistance formula for a copper wire goes as follows: R=TxL/A. In this formula T equals resistivity; L equals length of wire‚ and A equals cross sectional area. Another major part of copper wires is their current carrying capacity. Not surprisingly the value of amps able to
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The piezoresistive effect is given by (1 2 ) R R (1) where is the resistivity of the piezoresistor‚ depends on the doping concentration of the piezoresistors‚ ν is the Poisson’s ratio and is the mechanical strain induced in the diaphragm. The first part of the left hand side of equation 1 describes the piezoresistive effect and the second part defines the geometric effect. For piezoresistive materials like polysilicon‚ the piezoresistive effect dominates over geometric effect
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ELECTRICITY I. DISCOVER OF ELECTRICITY About 600 B.C.‚ Thales‚ a Greek philosopher and scientist‚ observed that a piece of amber attracted small bits of “paper” or very thin wood shavings after it was rubbed with wool. He had discovered‚ in effect‚ static electricity. William Gilbert‚ an English scientist in the sixteenth century‚ found that many other different materials could be made to act like amber. Whenever these objects were rubbed against each other‚ they were able to attract each other
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metal/’composite Electrical resistivity – high or low? Why? (i.e. explain your answer) Ductile or brittle? Why? (i.e. explain your answer) [4 marks] 2. A current of 1A flows in a metal rod which is 10 cm long and 1 mm in diameter. (a) What is the resistance of the rod if it is made from silver? From copper? What is the voltage between the ends of the rod‚ for silver? For copper? If the length of the rod is doubled to 20 cm‚ (b) Will the resistance change? By how much? Will the resistivity change? By how much
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constant resistance (R) in a DC circuit to give the equation . In a gel electrophoresis set up‚ the gel itself acts as the resistor. Various materials have their own various resistivity values (ρ)‚ which is an inherent property of the material and therefore remains constant as long as the material remains constant. Resistivity can be used to calculate the resistance of a material using the equation where L is the length of the material and A is the cross-sectional area of the material (Cutnell &
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04-579‚ Houston‚ Texas‚ 2004. 7. Silbernagel M.M. Modeling Coupled Fluid Flow And Geomechanical and Geophysical Phenomena Within a Finite Element Framework‚ thesis‚ 2007. 8. Xue Z. and Kim J.. Detecting and Monitoring CO2 With P-Wave Velocity and Resistivity From Both Laboratory and Field Scales‚ SPE 126885‚ 2009. Mineralogical and Petrophysical Data‚ SPE Formation Evaluation‚ V. 1 No. 6‚ 584-594‚ 1986. Symposium‚ 16-18 April 2007‚ Denver‚ Colorado‚ 2007.
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NANYANG TECHNOLOGICAL UNIVERSITY School of Electrical and Electronic Engineering Laboratory Experiment ------------------------------------------------- ------------------------------------------------- ------------------------------------------------- Laboratory Report ------------------------------------------------- ------------------------------------------------- For ------------------------------------------------- -------------------------------------------------
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is 3:4 and if the ratio of radii is 2:3 find the ratio of resistance of a and b. 9. Two wires are of same length and radius but one of them is copper and the other is of iron. Which will have more resistance? (Given the resistivity of copper = 1.62 x 10 -8 ohm meter and resistivity of iron = 10 x 10-8 ohm meter. 10. A wire of resistance 5 Ohm is spent in the form of closed circle. What is the resistance between 2 points at the ends of any diameter of the circle? 11. Two wires of equal cross sectional
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CATHODIC PROTECTION P E FRANCIS CONTENTS 1 2 3 INTRODUCTION............................................................................................................2 PRINCIPLES OF CATHODIC PROTECTION..........................................................3 METHODS OF APPLYING CATHODIC PROTECTION........................................5 3.1 3.2 4 4.1 4.2 4.3 4.4 4.5 4.6 4.7 IMPRESSED CURRENT..........................................................................................5 SACRIFICIAL
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