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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
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ained 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 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 . ..................[:=> 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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NING SEASON ON 12
SAFETY OF GROUNDING SYSTEMS
5 . INFLUENCES OF FREEZING SEASON ON 15
SAFETY OF GROUNDING SYSTEMS
6. MEASURES TO BE TAKEN 19
6.1 USE OF LONG VERTICAL GROUNDING ELECTRODES 19
6.2 THE CHEMICAL TREATMENT OF THE SOIL 19
7. CONCLUSION 22
8. REFER..................[:=> 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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eld environment. The crystal field
environment determines the colour or the emission wavelength
of the activator. In Mg
2
GeO
4
, since we are getting red emis-
sion, crystal field has considerable effect on 3d
5
electrons. Also
energy transfer mechanism is not so efficient as in the case of
Zn
2
GeO
4
:Mn. In Zn
2
GeO
4
the mechanism of PL is identified as
resonant energy transfer from a sub-band gap level, due to intrin-
sic defects, to Mn
2+
levels .InMg
2
GeO
4
also a sub-band
gap level is observed as the Mn
2+
emission is triggered from a
level which ..................[:=> 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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d
some 30,000 different multilayer combinations of different elements and layer
dimensions, they demonstrated the generality of GMR for all transition metal elements
and invented the structures that still hold the world records for GMR at low temperature,
room temperature and useful fields. In addition, they discovered oscillations in the
coupling strength: the magnetic alignment of the magnetic layers periodically swung
back and forth from being aligned in the same magnetic direction (parallel alignment) to
being aligned in opposite magnetic directions (anti-parallel alignment)...................[:=> 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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surface and residual stress distribution below the surface

¢ Residual stresses are always of a compressive nature and are usually present to the depth of the induction surface hardened layer

¢ Additional grinding of the induction surface hardened surface has an adverse effect on the stress state in the surface layer, since grinding always induces tensile residual stresses

¢ Correct selection of the machining conditions and the grinding wheel helps lessening the relative grinding tensile residual stress distributions which will help keep the favourable residual stress state a..................[:=> 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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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 promises to ?supercharge? the way energy is generated, delivered and used. At the heart of high temperature superconductivity lies a promise for the near f..................[:=> 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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oduced to solve this problem. But the problem of read- write into these ultra high density storage disks at good speeds is a major problem. 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 magnetoresis..................[:=> 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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rection primitives to provide varying levels of data protection. Five key evaluation points for such systems are: (1)..................[:=> Show Contents <=:]



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