检索结果-南通市图书馆

Strength reduction method for slope based on a ubiquitous-joint criterion and its application

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Mining Science and Technology 2009年第4期19卷 452-456页

作者： jiang qing-qing School of Resources and Safety Engineering Central South University Changsha Hunan 410083 China

In order to expand the application of strength reduction methods with the ubiquitous-joint criterion, the corresponding program is compiled using FLAC3D software. A procedure for strength reduction in the ubiquitous-joint criterion is proposed to study the safety factor of slopes as well as the relationships of the bedding plane inclination angle β and the safety factor F. The results show that： 1） for the bedding rock slope, the various failure modes cause different variations of the safety factor F; 2） a bed- ding rock slope can be divided into two types by the angle between the bedding plane inclination and slope surface inclination a; when a_〈45~, the bedding slope can be strictly defined as the subsequent bedding rock slope; when 45°〈α〈90°, the bedding slope is defined as an oblique bedding slope; 3） for bedding rock slopes, the safety factor increases with an increase in a; for inverse bed- ding slopes, when the bedding plane inclination angle fl is small, the safety factor F of the slope increases at first, then decreases with an increase in a; when β is large, the safety factor F increases with an increase in α.

关键词： slope safety factor strength reduction method numerical simulation

THICKNESS-SHEAR AND THICKNESS-TWIST VIBRATIONS OF CIRCULAR AT-CUT QUARTZ RESONATORS

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2013年第3期26卷 245-254页

作者： Huijing He Jiashi Yang qing jiang Department of Mechanical and Materials Engineering University of Nebraska-Lincoln School of Engineering Sun Yat-Sen University Guangzhou Ande Biotechnology Co. Ltd.

Exact solutions for free vibration frequencies and modes are obtained for thickness- shear and thickness-twist vibrations of unelectroded circular AT-cut quartz plates governed by the two-dimensional scalar differential equation derived by Tiersten and Smythe. Comparisons are made with experimental results and the widely-used perturbation solution by Tiersten and Smythe under the assumption of weak in-plane anisotropy. Our solution is found to be much closer to the experimental results than the perturbation solution. For the frequency of the fundamental thickness-shear mode, the error of the perturbation method is 0.4549%, significant in resonator applications.

关键词： plate linear vibration resonance

Dynamics of a prestressed Timoshenko beam subject to arbitrary external load

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第11期11卷 898-907页

作者： Ji-qing jiang Gui-ru YE Department of Civil Engineering Zhejiang University Hangzhou 310058 China

The free vibration and transient wave in a prestressed Rayleigh-Timoshenko beam subject to arbitrary transverse forces are analyzed by the newly developed method of reverberation-ray matrix (MRRM). The effects of shear deformation and rotational inertia are taken into consideration. With a Fourier transform technique, the general wave solutions with two sets of unknown amplitude coefficients are obtained in the transformed domain for an unbonded prestressed beam under the action of arbitrary external excitations. From the coupling at joints and the compatibility of displacements in each member, the free and forced vibration responses of a beam with various boundary conditions are finally evaluated through certain numerical algorithms. Results are presented for a simply-supported beam subject to either a point fixed load or moving load. Good agreement with the finite element method (FEM) is obtained. The present work is instructive for high-speed railway bridge design and structural health monitoring.

关键词： Reverberation-ray analysis Prestressed Timoshenko beam Free vibration Dynamic responses

New Explicit Exact Solutions to （2＋1）-Dimensional Generalized Broer-Kaup System

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2005年第3期43卷 397-400页

作者： HUANGDing-jiang ZHANGHong-qing DepartmentofAppliedMathematics DalianUniversityofTechnologyDalian116024China

A nonlinear transformation and some multi-solition solutions for the (2+1 )-dimensional generalized Broer-Kaup (GBK) system is first given by using the homogeneous balance method. Then starting from the nonlinear transformation, we reduce the (2+ 1)-dimensional GBK system to a simple linear evolution equation. Solving this equation,we can obtain some new explicit exact solutions of the original equations by means of the extended hyperbola function method.

关键词： generalized Broer-Kaup system nonlinear transformation exact solutions homogeneous balance method hyperbola function method

Exact Travelling Wave Solutions to a Coupled Nonlinear Evolution Equation[

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2004年第2X期42卷 171-174页

作者： HUANGDing-jiang ZHANGHong-qing DepartmentofAppliedMathematics DalianUniversityofTechnologyDalian116024China

By using an improved hyperbola function method, several types of exact travelling wave solutions to a coupled nonlinear evolution equation are obtained, which include kink-shaped soliton solutions, bell-shaped soliton solutions, envelop solitary wave solutions, and new solitary waves. The method can be applied to other nonlinear evolution equations in mathematical physics.

关键词：非线性展开方程精确行波解双曲函数理论封闭孤立波解非线性物理

Variable-Coefficient Hyperbola Function Method and Its Application to （2＋1）-Dimensional Variable-Coefficient Broer-Kaup System

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2004年第4X期42卷 481-484页

作者： HUANGDing-,jiang ZHANGHong-qing DepartmentofAppliedMathematics DalianUniversityofTechnologyDalian116024China

Based on a new intermediate transformation, a variable-coefficient hyperbola function method is *** concise and straightforward, it is applied to the (2+1)-dimensional variable-coefficient Broer Kaup system. As a result, several new families of exact soliton-like solutions are obtained, besides the travelling wave. When imposing some conditions on them, the new exact solitary wave solutions of the (2+1)-dimensional Broer-Kaup system are given. The method can be applied to other variable-coefficient nonlinear evolution equations in mathematical physics.

关键词：变量系数双曲线函数非线性展开方程类孤立子解 Broer-Kaup系统数学物理方法

Extended Hyperbola Function Method and Its Application to Nonlinear Equations

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2004年第6期41卷 801-804页

作者： HUANGDing-jiang ZHANGHong-qing DepartmentofAppliedMathematics DalianUniversityofTechnologyDalian116024China

An extended hyperbola function method is proposed to construct exact solitary wave solutions to nonlinear wave equation based upon a coupled Riccati equation. It is shown that more new solitary wave solutions can be found by this new method, which include kink-shaped soliton solutions, bell-shaped soliton solutions and new solitary *** new method can be applied to other nonlinear equations in mathematical physics.

关键词： nonlinear wave equations exact solitary wave solution hyperbola function method

Magnetic order driven by orbital ordering in the semiconducting KFe1.5Se2

在线全文

学校读者我要写书评

暂无评论

Frontiers of physics 2016年第2期11卷 75-81页

作者： qing jiang Dao-Xin Yao State Key Laboratory of Optoelectranic Materials and Technologies School of Physics and Engineering Sun Yat-sen University Guangzhou 5102~5 China

The two-orbital Hubbard model is studied numerically by using the Hartree-Fock approximation in both real space and momentum space, and the ground-state properties of the alkali metal iron selenide semiconducting KFel.5Se2 are investigated. A rhombus-type Fe vacancy order with stripe- type antiferromagnetic （AFM） order is found, as was observed in neutron scattering experiments [J. Zhao, et al., Phys. Rev. Lett. 109, 267003 （2012）]. Hopping parameters are obtained by fitting the experimentally observed stripe AFM phase in real space. These hopping parameters are then used to study the ground-state properties of the semiconductor in momentum space. It is found to be a strongly correlated system with a large on-site Coulomb repulsion U, similar to the AFM Mort insulator -- the parent compound of copper oxide superconductors. We also find that the electronic occupation numbers and magnetizations in the dxz and dyz orbitals become different simultaneously when U 〉 Uc （～3.4 eV）, indicating orbital ordering. These results imply that the rotational symmetry between the two orbitals is broken by orbital ordering and thus drives the strong anisotropy of the magnetic coupling that has been observed by experiments and that the stripe-type AFM order in this compound may be caused by orbital ordering together with the observed large anisotropy.

关键词： iron-based superconductor twoporbital model stripe AFM phase rhombus Fe vacancy order orbital ordering

GLASS TRANSITION AND THERMODYNAMIC FUNCTION OF ZrAlNiCuCo ALLOY

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 1999年第2期9卷 51-55页

作者： Zhao, Ming Li, Jianjun jiang, qing Jilin Univ of Technology Changchun China

１ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｇｌａｓｔｒａｎｓｉｔｉｏｎａｓａｐｏｌｙｍｏｒｐｈｏｕｓｏｎｅ（ｒｅｑｕｉｒｉｎｇｅｑｕａｌｉｔｙｏｆｃｏｍｐｏｓｉｔｉｏｎｉｎａｌｐｈａｓｅｓ）ｎｅｅｄｓａｖｅｒｙｓｍａｌＥ（ａｃ... 详细信息

１ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｇｌａｓｔｒａｎｓｉｔｉｏｎａｓａｐｏｌｙｍｏｒｐｈｏｕｓｏｎｅ（ｒｅｑｕｉｒｉｎｇｅｑｕａｌｉｔｙｏｆｃｏｍｐｏｓｉｔｉｏｎｉｎａｌｐｈａｓｅｓ）ｎｅｅｄｓａｖｅｒｙｓｍａｌＥ（ａｃｔｉｖａｔｉｏｎｅｎｅｒｇｙ）ｗｉ...

关键词： ZrAlNiCuCo alloyglass transitionthermodynamic functionKauzmann temperature