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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,


The relaxation time ť for metals refers to e- with Fermi velocity Vf .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 appro..................[:=> 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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mpedance of the grounding system by spreading the ground rods and grid over a large area. The possible solutions of that rather complicated problem may be summarized as follows:
¢ To change the soil resistivity in the limited area of interest by implementation of the chemically charged ground rods with or without an additional backfill.
¢ To establish remote ground grid connected to the main ground system.
¢ To use the deep-driven ground rods reaching underground water table or lower soil layers with low resistivity.
¢ To use main remote ground mats.
To analyze the technical ..................[:=> 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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= 0.10 and beyond that phase segregation
occurs due to inbuilt strain in the lattice. The shift in band gap
can be attributed to difference in ionic radii of Zn
2+
and Mg
2+
ions. Moreover, when Zn is co-doped in to Mg
2
GeO
4
system,
Zn
2+
will create states below the sub-band levels created due to
oxygen vacancy. So as more and more Zn gets added in to the
Mg
2
GeO
4
matrix, the band gap reduces.
Fig. 5 shows PL emission spectra of Mg
1.96-1.96x
Zn
1.96x
GeO
4
:Mn
0.04
(0 = x = 0.25) samples. All samples show emis-
sion in the red region and has intensity greate..................[:=> 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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the tunneling current changes with the relative
orientation of the two magnetic layers. The resistance is normally higher in the anti-
parallel case. It was discovered in 1975 by Michel Julliere, using iron as the ferromagnet
and germanium as the insulator. Room temperature TMR was discovered in 1995 first by
Terunobu Miyazaki and independently by Moodera et al. following renewed interest in
this field fueled by the discovery of the giant magnetoresistance effect. In 2005, the first
drives to use TMR heads were introduced by Seagate allowing 400 GB drives with 3
disk platters (60G..................[:=> 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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g residual austenite, which contributes to the formation of tensile residual stresses due to finish grinding.

3. Tempering effects in the martensite microstructure also contribute to the formation of tensile residual stresses due to finish grinding.

4. Material plastic deformation due to finish grinding can produce compressive or tensile residual stresses depending on the type of grinding wheel and the grinding conditions.

¢ Induction surface hardening creates a very desirable residual stress state at the surface and residual stress distribution below the surface

¢ Residual s..................[:=> 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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ample, 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 new class 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..................[:=> 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
giant magneto resistance gmr, giant magnetoresistance in organic spin valves , magnetoresistance in graphene, magnetoresistance in semiconductors , magnetoresistance in metals, magneto resistance is futile , magnetoresistance hall effect, giant magnetoresistance gmr , magnetoresistance graphene, magneto resistance briggs , MAGNETO RESISTANCE, RESISTANCE , MAGNETO, EXTRAORDINARY , extraordinary magneto resistance seminar,
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 create read- write heads which can access the data from the high density storage disks which in normal case would not have been possible. Using this property, magnetic sensor read heads can be made which has a sensing capacity upto 1000 GB/sq.inch. This sensing capacity is very high compared to the normal maximum sensing capacity of 13 Gb/sq. inch. The introduction of this technology can solve the problem of d..................[:=> 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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res enables a system architect to make rational investment decisions in designing a secure, embedded system.

Tamper-resistant storage techniques provide varying degrees of authenticity and integrity for data. This paper surveys five implemented tamper-resistant storage systems that use encryption, cryptographic hashes, digital signatures and error-correction primitives to provide varying levels of data protection. Five key evaluation points for such systems are: (1) authenticity guarantees, (2) integrity guarantees, (3) confidentiality guarantees, (4) performance overhead attributed to sec..................[:=> Show Contents <=:]



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