Results 71 to 80 of about 2,280,314 (252)

The charge density of semiconductors in the GW approximation [PDF]

, 1998
We present a method to calculate the electronic charge density of periodic solids in the GW approximation, using the space-time method. We investigate for the examples of silicon and germanium to what extent the GW approximation is charge-conserving and ...
A. Schindlmayr, B. Farid, D. M. Ceperley, D. R. Hamann, G. Baym, G. Baym, H. J. de Groot, H. N. Rojas, J. P. Perdew, L. Hedin, M. Deutsch, M. Rohlfing, M. S. Hybertsen, Martin M. Rieger, O. H. Nielsen, R. W. Godby, R. W. Godby, X. Zhu, Z. W. Lu, Z. W. Lu   +19 more
core   +2 more sources

Piezoresistive Monitoring of Carbon Nanomaterial‐Reinforced Epoxy Composites Under Cyclic and Fatigue Loading: A Review

Advanced Engineering Materials, EarlyView.
Carbon nanomaterial‐reinforced epoxy composites exhibit pronounced piezoresistive behavior, enabling intrinsic damage sensing under cyclic and fatigue loading. This review critically compares carbon nanotube and graphene systems, correlating filler content, percolation threshold, and gauge factor with sensing stability and damage evolution.
J. M. Parente, J. Nunes‐Pereira, A. P. Silva, P. N. B. Reis   +3 more
wiley   +1 more source

Simultaneous space charge and conduction current measurements in solid dielectrics under high dc electric field

, 2006
The importance of space charge in solid dielectrics has been recognized for many years and various attempts have been made to map the distribution and assess its influence on the electrical performance of solid dielectrics. Significant development in non-
Chen, G, Lau, W S
core  

Electrical Conductivities of Conductors, Semiconductors, and Their Mixtures at Elevated Temperatures

Advanced Engineering Materials, EarlyView.
This article presents a comprehensive review of temperature‐dependent electrical conductivity data for multiple material classes at elevated temperatures, highlighting a persistent conductivity gap between metals and semiconductors in the range of 102$\left(10\right)^{2}$– 107$\left(10\right)^{7}$ S/m. Metal–ceramic irregular metamaterials are proposed
Valentina Torres Nieto, Marcia A. Cooper
wiley   +1 more source

Quantum capacitor with discrete charge-anticharge: spectrum and forces

, 2009
The quantum capacitor with discrete charge is modeled by a Hamiltonian containing an inductive intrinsic term (tunnel effect between plates). The spectrum is obtained using a double Hilbert space.
, Bohm A., Casimir H. B. G., de los Santos H. J., Di Ventro M., Flores J. C., Imry Y., J. C. Flores, Landau L. D., Louisell W. H.   +9 more
core   +1 more source

Dynamic Testing of Cold Gas Sprayed Bipolar Plates–Porous Transport Layer Coating System in Proton Exchange Membrane Water Electrolysis

Advanced Engineering Materials, EarlyView.
Through direct application of porous transport layer (PTL) on the bipolar plate (BPP) with thermal spraying, the interfacial contact resistance is improved. With the cold gas sprayed BPP–PTL coating system, a proton exchange membrane water electrolysis cell with a cell voltage of Ucell = 1.9 V can be operated up to i = 2.5 A/cm2 in a dynamic mode ...
Kirsten Bobzin, Marvin Erck, Kevin Jasutyn, Katja Radermacher, Andreas Bund, Mario Kurniawan   +5 more
wiley   +1 more source

Space Charge Behavior in Ethylene Propylene Rubber Under a 50-Hz AC Electric Field

IEEE Access, 2019
In this study, the space charge behavior in ethylene propylene rubber (EPR) under a 50-Hz AC field is studied based on the variation of space charge response, FTIR spectra and impurity contents inside EPR with thermal treatment.
Chang Dai, Yi Yin, Guiyue Zhou, Linxin Miao, Jiandong Wu   +4 more
doaj   +1 more source

Corrosion and Process Analysis of a Preoxidized MgO Recyclate‐Based Cermet Anode in Laboratory‐Scale Na‐Cryolite Molten Salt Electrolysis of Aluminum at 1000°C

Advanced Engineering Materials, EarlyView.
EDX elemental map of the pre‐oxidized MgO–steel cermet anode cross section after electrolysis. The development of inert anodes for aluminum electrolysis remains challenging due to the high corrosivity of cryolite‐based melts at 950°C–1000°C. This study investigates the corrosion and process behavior of a carbon‐free MgO–steel cermet anode derived from ...
Alexander Adamczyk, Farhan Hossain, Felipe A. Garcia Paz, Serhii Yaroshevskyi, Felix Drechsler, Daniel Vogt, Christos G. Aneziris, Alexandros Charitos   +7 more
wiley   +1 more source

Inhibition Effect of Graphene on Space Charge Injection and Accumulation in Low-Density Polyethylene

Nanomaterials, 2018
Space charge injection and accumulation is attracting much attention in the field of dielectric insulation especially for electronic devices, power equipment and so on.
Zhonglei Li, Jingang Su, Boxue Du, Zhaohao Hou, Chenlei Han   +4 more
doaj   +1 more source

Space Charge Effect and Mirror Charge Effect in Photoemission Spectroscopy

, 2004
We report the observation and systematic investigation of the space charge effect and mirror charge effect in photoemission spectroscopy. When pulsed light is incident on a sample, the photoemitted electrons experience energy redistribution after ...
Brouet, V., Dessau, D., Douglas, J. F., Hussain, Z., Shen, Z. -X., Sun, Z., Wannberg, B., Yang, W. L., Zhou, X. J.   +8 more
core   +1 more source