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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,
LE

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 say that T is extremely small for monovalent metals.
from eqn. given below we can calculate mean free path λ-

λ = Vx * ťc ----------(2)


The rela..................[:=> 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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horizontal grounding system (the left side of the vertical dot line in figure), if a current is injected-into the grounding system, the current would mainly flow into the bottom normal soil with resistivity of 200 m, and there is a very small part of current that would flow through the upper freezing soil layer with high resistivity formed in freezing season, so the grounding resistance is almost kept unchanged.
When the thickness of the high resistivity soil layer exceeds the burial depth of the grounding grid (the right side of the vertical dot line in figure), if a current is injected int..................[:=> 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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Mg
1.96-1.96x
Zn
1.96x
GeO
4
:Mn
0.04
(0 = x = 1).
Fig. 2. Variation of Cell volume and band gap with Zn concentration. Straight
(dashed) line shows apparent linear fit to data.
is favoured and when x = 0.5, Zn
2
GeO
4
phase got enhanced
thereby forming Zn
1.96-1.96x
Mg
1.96x
GeO
4
:Mn. The cell volume
is found to increase with x which is expected as the cell
volume of Zn
2
GeO
4
is larger than that of Mg
2
GeO
4
(Fig. 2).
The band gap of Mg
2
GeO
4
:Mn
2+
and Zn
2
GeO
4
:Mn
2+
, cal-
culated from the spectra are 5 eV and 3.45 eV, respectively..................[:=> 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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you to drive from one town to
another. Without obstacles on a freeway, you can proceed quickly. But if you encounter
heavy traffic, accidents, road construction and other obstacles, you'll travel much slower.
Depending on its magnetic direction, a
single-domain magnetic material will scatter electrons with up or down spin
differently. When the magnetic layers in GMR structures are aligned anti-parallel, the
resistance is high because up electrons that are not scattered in one layer can be
scattered in the other. When the layers are aligned in parallel, all of the up electr..................[:=> 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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es

¢ Good Repeatability

¢ Hardened Layer Quality

¢ Small or Negligible Subsequent Distortion

¢ Minimum Subsequent Product Surface Oxidation

¢ Good Possibilities for Automation

SURFACE INTEGRITY AND ITS LEVELS

Scientific discipline providing an integral assessment 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 O..................[:=> 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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s of ceramic super conductors were discovered that ?SUPERCONDUCTED? at higher temperatures. The science of high temperature superconductivity (HTS) was born, and Along with it came the prospect for an elegant technology that promises to ?supercharge? the way energy is generated, delivered and used. At the heart of high temperature superconductivity lies a promise for the near future. A promise for transmitting and using electricity with near perfect efficiency and much higher capacity, besides all this it also has a wide range of application like MRI scanning, maglev trains etc. This seminars ..................[:=> 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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enario this technology is a much awaited one as it can really revolutionize the data handling speeds. Extraordinary magnetoresistance is that property of material which exhibits dramatically high levels of magnetoresistance...................[:=> 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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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.

The vulnerability landscape of an embedded system is a vast expanse of attacks. A good understanding of the threats is necessary so that countermeasures can be devised to protec..................[:=> Show Contents <=:]



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