نتایج جستجو برای: electric conductivity

تعداد نتایج: 187335  

2004
J. A. Voorthuyzen P. Bergveld

The operation of the Metal Oxide Semiconductor Field Effect Transistor (MOSFET) is based on the fact that the lateral conductivity of silicon at the silicon dioxide-silicon interface strongly depends on the transverse electric field in the oxide. Adding a small air-filled spacer between metal gate and oxide, and applying a voltage across the insulator on top of the silicon, the lateral conducti...

2004
Hao Lin Brian D. Storey Franklin W. Olin Michael H. Oddy Chuan-Hua Chen Juan G. Santiago

Electrokinetic flow is leveraged in a variety of applications, and is a key enabler of on-chip electrophoresis systems. An important sub-class of electrokinetic devices aim to pump and control electrolyte working liquids with spatial gradients in conductivity. These high-gradient flows can become unstable under the application of a sufficiently strong electric field. In this work the instabilit...

2013
Joonsung Lee Yizhuang Song Narae Choi Sungmin Cho Jin Keun Seo Dong-Hyun Kim

Anisotropic electrical properties can be found in biological tissues such as muscles and nerves. Conductivity tensor is a simplified model to express the effective electrical anisotropic information and depends on the imaging resolution. The determination of the conductivity tensor should be based on Ohm's law. In other words, the measurement of partial information of current density and the el...

2018
Nanqiang Shang Qingguo Chen Xinzhe Wei

The conductivity mismatch in the composite insulation of high voltage direct current (HVDC) cable accessories causes electric field distribution distortion and even insulation breakdown. Therefore, a liquid silicone rubber (LSR) filled with SiC nanoparticles is prepared for the insulation of cable accessories. The micro-morphology of the SiC/LSR nanocomposites is observed by scanning electron m...

Journal: :Physical review letters 2010
P V Buividovich M N Chernodub D E Kharzeev T Kalaydzhyan E V Luschevskaya M I Polikarpov

We study the correlator of two vector currents in quenched SU(2) lattice gauge theory with a chirally invariant lattice Dirac operator with a constant external magnetic field. It is found that in the confinement phase the correlator of the components of the current parallel to the magnetic field decays much slower than in the absence of a magnetic field, while for other components the correlati...

2010
Leonid Kunyansky

We propose and test stable algorithms for the reconstruction of the internal conductivity of a biological object using acousto-electric measurements. Namely, the conventional impedance tomography scheme is supplemented by scanning the object with acoustic waves that slightly perturb the conductivity and cause the change in the electric potential measured on the boundary of the object. These per...

2017
Olena Yakovenko Ludmila Matzui Ganna Danylova Victor Zadorozhnii Ludmila Vovchenko Yulia Perets Oleksandra Lazarenko

The article reports about electric field-induced alignment of the carbon nanoparticles embedded in epoxy matrix. Optical microscopy was performed to consider the effect of the electric field magnitude and configuration, filler morphology, and aspect ratio on alignment process. Characteristic time of aligned network formation was compared with modeling predictions. Carbon nanotube and graphite n...

2008
Devesh Tiwari Bikramjit Basu Koushik Biswas

Finite element simulations have been conducted to determine the temperature distribution (both in radial and axial direction), heat and electric flux-field in the powder compact/die/punch assembly during the spark plasma sintering (SPS) process. A thermal–electrical coupled model with temperature dependent thermal and electrical properties is implemented. The simulation studies were conducted u...

2016
Alfred D. Shapere

We derive a generalized set of Ward identities that captures the effects of topological charge on Hall transport. The Ward identities follow from the 2+1 dimensional momentum algebra, which includes a central extension proportional to the topological charge density. In the presence of topological objects like Skyrmions, we observe that the central term leads to a direct relation between the the...

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