نتایج جستجو برای: principal directions of ground excitation

تعداد نتایج: 21196095  

جعفری, سیداکبر, شهبازی, فرهاد, قربانی, الهه,

  Resonating valence bond (RVB) states are suitable candidates for ground state of the Heisenberg model on various two dimensional lattices. When a singlet valence bond is broken to produce a triplet state, the resulting excitation is called a triplon. In this paper, we obtain formulas for the overlap and also matrix elements of si.sj operator between states with arbitrary number of triplons . ...

Journal: :فیزیک کوانتومی 0

in this paper, lagrangian and equations describing one-dimensional anisotropic non-heisenberg model are studied. in this study we used the generalized coherent states in real parametrizations and the feynman path integral for these states in su(3) group. these equations describe nonlinear dynamics of non-heisenberg ferromagnetic chain completely. solutions of these equations are magnetic solito...

2001
A. Oosawa T. Kato H. Tanaka K. Kakurai M. Müller H. - J. Mikeska

TlCuCl 3 has a singlet ground state with the excitation gap ∆ = 0.65 meV. The magnetic excitations in TlCuCl 3 have been investigated by means of neutron inelastic scattering experiments. The constant-Q Q Q energy scan profiles were collected in the a * − c * plane. A well-defined single magnetic excitation mode was observed. The dispersion relations along four different directions were determi...

This study describes a simple and rapid approach of monitoring ibuprofen (IBP). Unfolded principal component analysis-artificial neural network (UPCA-ANN) and excitation-emission spectra resulted from spectrofluorimetry method were combined to develop new model in the determination of IBF in human serum samples. Fluorescence landscapes with excitation wavelengths from 235 to 265 nm and emission...

This study describes a simple and rapid approach of monitoring ibuprofen (IBP). Unfolded principal component analysis-artificial neural network (UPCA-ANN) and excitation-emission spectra resulted from spectrofluorimetry method were combined to develop new model in the determination of IBF in human serum samples. Fluorescence landscapes with excitation wavelengths from 235 to 265 nm and emission...

2002
A. Oosawa H. Tanaka K. Kakurai M. Müller H. - J. Mikeska

TlCuCl 3 has a singlet ground state with the excitation gap ∆ = 0.65 meV. The magnetic excitations in TlCuCl 3 have been investigated by means of neutron inelastic scattering experiments. The constant-Q Q Q energy scan profiles were collected in the a * − c * plane. A well-defined single magnetic excitation mode was observed. The dispersion relations along four different directions were determi...

پایان نامه :دانشگاه آزاد اسلامی - دانشگاه آزاد اسلامی واحد گرمسار - دانشکده علوم انسانی 1390

this study examined the effects of collaborative strategic reading and direct instruction in persuasion on iranian high school students persuasive writing and attitudes. students in three intact classes were assigned to one of three treatment conditions: collaborative strategic reading and direct instruction in persuasion or direct instruction in persuasion or a control group. treatment effects...

A. A. Fakhimi, M.J. moosavi

The conventional method to evaluate earthquake induced permanent deformations of slopes is the one proposed by Newmark. In this paper, permanent displacement of slopes is studied using a combination of distinct element and finite difference methods and the results of these numerical evaluations are compared with those of the Newmark's approach. Several parameters involved, including peak ground...

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