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ELECTRON SCATTERING RESISTIVITY OF METALS ppt


Posted by: seminar surveyer
Created at: Tuesday 04th of January 2011 04:09:15 AM
Last Edited Or Replied at :Tuesday 04th of January 2011 04:09:15 AM
seminar on resistivity of metals , electron scattering and metal resistivity ppt, electron scattering resistivity of metals pdf , electron scattering in metals, resistivity of metals , electron electron scattering in metals, electron scattering ppt , electron scattering metal resistance powerpoint,
.For usual values of temp. T , it may be shown that the scattering in these monovalent metals is isotropic . Then, ť=tc & λ = Vx * ťc .The values of man free path at 0 0c are several hundred angstroms.

We find from the graph shown that as we goes on reducing the temp of a metal then it’s resistivity also decreases & vice versa but assume a constant value of temp. below 6 K.
In general, the resistivity of a perfect, pure single crystal of a metal approaches to zero as temp. T approaches zero. This signifies that at very low temp. the mean free path λ ..................[:=> Show Contents <=:]



SEASONAL INFLUENCES ON SAFETY OF SUBSTATION GROUNDING SYSTEMS full report


Posted by: computer science technology
Created at: Thursday 21st of January 2010 01:13:25 AM
Last Edited Or Replied at :Saturday 25th of February 2012 12:39:46 AM
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the low resistivity soil layer. The higher the resistivity smaller is the influence on step voltage. If the resistivity of the affected soil layer is small, and its thickness h is smaller than 0.5H ( H is the burial depth of the grounding system. 0.8 m is used in this paper), the step voltage decreases very quickly. In raining season, the step voltage is smaller than the respective normal value; it is safe for human beings


5 . INFLUENCES OF FREEZING SEASON ON SAFETY OF GROUNDING SYSTEMS
INFLUENCE ON GROUNDING RESISTANCE
In freezing season, a high-resistivity surface soil layer is fo..................[:=> Show Contents <=:]



Journal of Alloys and Compound JALCOM -


Posted by: seminar projects crazy
Created at: Saturday 13th of June 2009 03:43:16 PM
Last Edited Or Replied at :Saturday 13th of June 2009 03:43:16 PM
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+Model
JALCOM-17427; No.of Pages4
Journal of Alloys and Compounds xxx (2008) xxx“xxx
Mg
1.96-1.96x
Zn
1.96x
GeO
4
:Mn
0.04
phosphors for electroluminescent
display applications
G. Anoop, K. Mini Krishna, M.K. Jayaraj
*
Optoelectronic Devices Laboratory, Department of Physics, Cochin University of Science and Technology, Kochi 682022, Kerala, India
Received 27 June 2007; received in revised form 7 January 2008; accepted 9 January 2008
Abstract
Orthorhombic magnesium germenate (Mg
2
GeO
4
) doped with manganese was synthesized by solid-state reaction technique. A bro..................[:=> Show Contents <=:]



SEMINAR REPORT On Giant Magnetoresistance Effect


Posted by: Computer Science Clay
Created at: Saturday 13th of June 2009 02:36:40 PM
Last Edited Or Replied at :Saturday 13th of June 2009 02:36:40 PM
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ipitate by rapidly
cooling a molten mixture of copper and cobalt. Granule sizes vary depending on the
cooling rate and amount of subsequent annealing. Granular GMR materials have not
been able to produce the high GMR ratios found in the multilayer counterparts.
SPIN VALVE “ THE REVOLUTION
Two ferromagnetic layers are separated by a thin (about 3 nm)
non-ferromagnetic spacer, but without RKKY coupling. If the coercive fields of the two
ferromagnetic electrodes are different it is possible to switch them independently.
Therefore, parallel and anti-parallel alignment can be ac..................[:=> Show Contents <=:]



ANALYSIS OF RESIDUAL STRESSES IN MAIN CRANKSHAFT BEARINGS AFTER INDUCTION SURFACE


Posted by: computer science crazy
Created at: Friday 17th of April 2009 07:52:50 AM
Last Edited Or Replied at :Friday 21st of December 2012 11:11:44 PM
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ent of the surface and surface layers
Measurement of Roughness and Analysis of Microstructure and Microhardness in the Thin Surface Layer
Studies of Residual Stresses in the Surface Layer and of the Mechanical Properties of the given material
Tests making clear the Behaviour of the given part under Operating Conditions

Important features on the curves are:

(a) the maximum value of the compressive residual stress in the hardened surface layer.

(b) the maximum value of the tensile residual stress in the hardened surface layer.

(c) the transition width from compressive to tensile r..................[:=> Show Contents <=:]



HIGH TEMPERATURE SUPER CONDUCTIVITY


Posted by: seminar projects crazy
Created at: Friday 30th of January 2009 01:28:20 PM
Last Edited Or Replied at :Friday 30th of January 2009 01:28:20 PM
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ctric current with no resistance and extremely low losses. This ability to carry large amounts of currents can be applied to electric power devices such as motors and generators and to electricity transmission in power lines. For example, superconductors can carry as much as 100 times the electricity ordinary copper or aluminium wires of same size.Scientists had been intrigued with the concept of superconductivity since its discovery in the early 1900?s, but the extreme low temperature the phenomenon required was a barrier to practical and low cost application. This all changed in 1986 when a ..................[:=> Show Contents <=:]



EXTRAORDINARY MAGNETO RESISTANCE


Posted by: seminar projects crazy
Created at: Friday 30th of January 2009 01:20:50 PM
Last Edited Or Replied at :Friday 30th of January 2009 01:20:50 PM
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blem. With the current technology which is available now, however large the storage capacity be, the amount of data which can be read or written into the disk has a limitation. This limit now a days is 13Gb/sq. inch. So the hard drive storage density has to be limited to that extent. The storage density cannot be increased even though the technology to do so is available because of the read head limitation. Here comes the importance of extraordinary magnetoresistance. This property makes it possible to create hard disks of high density storage, because by using this property it is possible cre..................[:=> Show Contents <=:]



Tamper Resistance


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 11:38:04 PM
Last Edited Or Replied at :Sunday 21st of September 2008 11:38:04 PM
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rocesses is necessary. Tamper-resistance is being increasingly used as an important piece of a more comprehensive security system. It provides an effective barrier to entry and protects digital assets in the embedded systems from most people and most attacks. Embedded systems pose unique security challenges because they are largely used in relationships where one party wants to put a secure, embedded device, in the hands of another, with the assurance that the second party cannot modify/hack the device. First, we outline the major attacks that threaten the security of an embedded system.

T..................[:=> Show Contents <=:]



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