ZPE_Logo
  
Search        
  Create an account Home  ·  Topics  ·  Downloads  ·  Your Account  ·  Submit News  ·  Top 10  
Mission Statement

Modules
· Home
· Forum
· LATEST COMMENTS
· Special Sections
· SUPPORT ZPEnergy
· Advertising
· AvantGo
· Books
· Downloads
· Events
· Feedback
· Link to us
· Private Messages
· Search
· Stories Archive
· Submit News
· Surveys
· Top 10
· Topics
· Web Links
· Your Account

Who's Online
There are currently, 111 guest(s) and 0 member(s) that are online.

You are Anonymous user. You can register for free by clicking here

Events

Hot Links
Aetherometry

American Antigravity

Closeminded Science

EarthTech

ECW E-Cat World

Innoplaza

Integrity Research Institute

New Energy Movement

New Energy Times

Panacea-BOCAF

RexResearch

Science Hobbyist

T. Bearden Mirror Site

USPTO

Want to Know

Other Info-Sources
NE News Sites
AER_Network
E-Cat World
NexusNewsfeed ZPE
NE Discussion Groups
Energetic Forum
EMediaPress
Energy Science Forum
Free_Energy FB Group
The KeelyNet Blog
OverUnity Research
Sarfatti_Physics
Tesla Science Foundation (FB)
Vortex (old Interact)
Magazine Sites
Electrifying Times (FB)
ExtraOrdinary Technology
IE Magazine
New Energy Times

Interesting Links

Click Here for the DISCLOSURE PROJECT
SciTech Daily Review
NEXUS Magazine

GIANT PIEZORESISTANCE; IRON SUPERCONDUCTIVITY
Posted on Thursday, May 01, 2008 @ 10:57:58 UTC by vlad

Science From the PHYSICS NEWS UPDATE No. 863 May 1, 2008: GIANT PIEZORESISTANCE. A new experiment, conducted by scientists from France, Switzerland, and the UK, has recorded the largest ever change in a bulk material's electrical resistance brought about by stretching the material at room temperature. Piezoresistance is one of several phenomena in which a resistance change, prompted by a change in another physical parameter, can be used in making sensitive sensors. In magnetoresistance, for example, the force from a tiny magnetic domain can alter the resistance of a circuit in a scanner directly overhead. A pronounced form of this effect, giant magnetoresistance, is at the heart of the billion-dollar hard-drive industry, earning three pioneer scientists the Nobel prize in physics in 2007.



In piezoresistance, by contrast, it's not a tiny magnetic field but the tiny mechanical stretching of a material that alters the resistance, which in turn registers as an electrical signal. Piezoresistive devices have been in use for some time. In simple metal-foil versions, the kind used in monitoring the integrity of concrete wallw or in monitoring prosthetic limbs, the change in resistance per unit of strain (a ratio referred to as the gage factor) typically has a value of about 2. For the more expensive silicon-based piezoresistors, the kind used in cell phones and airbag accelerometers, the gage factor is usually about 100.

In the new experiment a metal/silicon hybrid piezoresistance sample yielded a gage factor of 900, the largest ever seen at room temperature in a bulk material. (Larger gage factors have been observed at impractically low temperatures where quantum effects accentuate the piezoresistance.) Giant piezoresistive structures should be good news for the designers of MEMS (microelectromechanical systems) devices where it is important to measure ultra-small accelerations, or atomic-scale deflections.

Alternatively, higher sensitivity to movement can be translated into lower power requirements when (as in cell phones) battery energy is at a premium. One of the researchers, Alistair Rowe of the Ecole Polytechnique in Palaiseau, France (alistair.rowe@polytechnique.edu, 33-169-3347-87) says that the giant-piezoresistance materials probably wouldn't be used directly as a storage medium but more likely as a method for reading mechanically-stored information in devices like IBM's "Millipede." (Rowe et al., Physical Review Letters, 11 April 2008)

IRON SUPERCONDUCTIVITY. The highest superconductivity transition temperature for a non-copper material, 43 K, has been achieved by Japanese scientists at the Nihon University, the Frontier Research Center, and the Tokyo Institute of Technology. To attain a comparatively high transition temperature, the researchers had to squeeze their La-O-F-Fe-As sample with a pressure of 4 giga-pascals. (Takahashi et al., Nature, 23 April 2008)

----------
PHYSICS NEWS UPDATE
The American Institute of Physics Bulletin of Physics News
Number 863 May 1, 2008 www.aip.org/pnu
by Phillip F. Schewe and Jason S. Bardi

 
Login
Nickname

Password

Security Code: Security Code
Type Security Code

Don't have an account yet? You can create one. As a registered user you have some advantages like theme manager, comments configuration and post comments with your name.

Related Links
· More about Science
· News by vlad


Most read story about Science:
100 miles on 4 ounces of water?


Article Rating
Average Score: 0
Votes: 0

Please take a second and vote for this article:

Excellent
Very Good
Good
Regular
Bad


Options

 Printer Friendly Printer Friendly


"GIANT PIEZORESISTANCE; IRON SUPERCONDUCTIVITY" | Login/Create an Account | 0 comments
The comments are owned by the poster. We aren't responsible for their content.

No Comments Allowed for Anonymous, please register

 

All logos and trademarks in this site are property of their respective owner. The comments are property of their posters, all the rest © 2002-2016 by ZPEnergy. Disclaimer: No content, on or affiliated with ZPEnergy should be construed as or relied upon as investment advice. While every effort is made to ensure that the information contained on ZPEnergy is correct, the operators of ZPEnergy make no warranties as to its accuracy. In all respects visitors should seek independent verification and investment advice.
Keywords: ZPE, ZPF, Zero Point Energy, Zero Point Fluctuations, ZPEnergy, New Energy Technology, Small Scale Implementation, Energy Storage Technology, Space-Energy, Space Energy, Natural Potential, Investors, Investing, Vacuum Energy, Electromagnetic, Over Unity, Overunity, Over-Unity, Free Energy, Free-Energy, Ether, Aether, Cold Fusion, Cold-Fusion, Fuel Cell, Quantum Mechanics, Van der Waals, Casimir, Advanced Physics, Vibrations, Advanced Energy Conversion, Rotational Magnetics, Vortex Mechanics, Rotational Electromagnetics, Earth Electromagnetics, Gyroscopes, Gyroscopic Effects

PHP-Nuke Copyright © 2005 by Francisco Burzi. This is free software, and you may redistribute it under the GPL. PHP-Nuke comes with absolutely no warranty, for details, see the license.