نتایج جستجو برای: band theory

تعداد نتایج: 905784  

صالحی, حمدا…,

 The electronic structure and optical properties in tetragonal ceramics PbTiO3 are studied by using full-potential linearized augmented plane wave (FP-LAPW) method in density functional theory (DFT) with the generalized gradient approximation (GGA) by WIEN2K package. The theoretical calculated optical properties and energy loss (EEL) spectrum yield a static refractive index of 2.59 and a plasmo...

قنبریان, وحید , محمد زاده, محمد رضا ,

  In order to study some theories about nonsuperconductivity of PrBa2Cu3O7, based on the density functional theory and with APW+lo/LAPW method some calculations for PrBa2Cu3O7 (Pr123) and YBa2Cu3O7 (Y123) were performed. The LSDA+U approximation was used for Pr(4f) orbitals and the effect of changing UPr on the band structure, Pr(4f)-DOS, distribution of electrons on the planes and chains, and ...

Journal: :international journal of environmental research 2012
s. farzin p. ifaei n. farzin y. hassanzadeh m.t. aalami

chaos theory discusses unstable and non-periodic behavior of non-linear fluctuating dynamicsystems. since evaporation level variations of lakes have a dynamic identity, chaos theory can have a uniquerole in collecting data of these variations. therefore it is an important and challenging problem in the field ofplanning and qualitative and quantitative management of urmia lake to verify whether ...

پایان نامه :0 1374

this thesis is going to delineate the concept of the reader as implied in 18th century literary theory; based on the study of the major reader oriented elements of criticism of the age-taste, the sublime, and aesthetic pleasure-its aim is to explain what sott of reader is implied and what kind of response on the part of the reader is proposed in 18th century english literary theory and aestheti...

Journal: :Journal of the American Chemical Society 2002
Stefan Franzen Stacie E Wallace-Williams Andrew P Shreve

A complete resonance Raman excitation profile of the heme charge-transfer band known as band III is presented. The data obtained throughout the near-infrared region show preresonance with the Q-band, but the data also clearly show the enhancement of a number of modes in the spectral region of band III. Only nontotally symmetric modes are observed to have resonance enhancement in the band III re...

Journal: :The journal of physical chemistry letters 2016
Jason M Crowley Jamil Tahir-Kheli William A Goddard

An important property with any new material is the band gap. Standard density functional theory methods grossly underestimate band gaps. This is known as the band gap problem. Here, we show that the hybrid B3PW91 density functional returns band gaps with a mean absolute deviation (MAD) from experiment of 0.22 eV over 64 insulators with gaps spanning a factor of 500 from 0.014 to 7 eV. The MAD i...

1991
A. P. Balachandran G. Bimonte

We develop elementary canonical methods for the quantization of abelian and nonabelian Chern-Simons actions using well known ideas in gauge theories and quantum gravity. Our approach does not involve choice of gauge or clever manipulations of functional integrals. When the spatial slice is a disc, it yields Witten’s edge states carrying a representation of the Kac-Moody algebra. The canonical e...

2013
HITOMI KAJIWARA MUNETOYO TODA TOSHIKI MINE HIROSHI NAKADA TAKESHI YAMAMOTO

Isolation of Fucosyltransferase-Producing Bacteria from Marine Environments HITOMI KAJIWARA, MUNETOYO TODA, TOSHIKI MINE, HIROSHI NAKADA, and TAKESHI YAMAMOTO* Glycotechnology Business Unit, Japan Tobacco Inc., 700 Higashibara, Iwata, Shizuoka 438–0802, Japan; Intellectual Property Center, Legal Division, Japan Tobacco Inc., 2–1, Toranomon 2-chome, Minato-ku, Tokyo, 105–8422, Japan; and Departm...

2012
Dusan A. Nesic Branko M. Kolundzija

Based on the well known theory of infinite periodic structures, analytical theory of EBG (electromagnetic band gap) cells suppressing 6 higher (spurious) stop-bands is developed. Using such cells in a cascade the straight-forward procedure for design of the corresponding EBG band-stop filter is proposed, with possibility to control the width and the depth of the stopband. The analytical theory ...

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