一种新的节理本构模型及几种新的滑坡稳定系数计算方法

在对滑坡渐进变形分析的基础上,提出一种新的节理本构模型,推理出本构模型参数的决定方法;分析临界状态应力特征,提出临界状态应变方程,将提出的本构理论和现行莫尔–库仑临界状态准则实现无缝连接。分析现行滑坡稳定性系数计算方法的优缺点,相应地提出滑坡稳定性系数几种新的计算方法:基于渐进变形的临界状态稳定性系数计算方法、部分条块强度折减稳定性系数计算方法、综合下滑力–摩阻力稳定性系数计算方法、最大主下滑力滑坡稳定性系数计算方法,以及每一条块滑坡稳定性系数计算方法。对传统滑坡稳定性系数计算方法和本文提出的方法进行对比分析,进而提出综合下滑力–摩阻力稳定性系数以及最大主下滑力稳定性系数计算方法较能反应工程实践。最后,以实例对所提出的计算模型进行对比分析。

Zoeppritz方程反射系数计算方法综述

近年来地震勘探发挥着越来越重要的作用。Zoeppritz方程计算反射系数在诸如AVO技术等众多地震勘探方法技术中的重要性是不可忽视的。在介绍了Zoeppritz方程的基础上,总结了15种Zoeppritz方程反射系数计算方法简化或近似公式,最后指出Zoeppritz方程反射系数计算方法的发展方向。

钢筋砼双向板设计的计算机方法

采用按弹性理论计算钢筋砼双向板弯矩系数的简捷方法来计算弯矩，具有编程简单明了的优点；按照《砼结构设计规范）（GBJ10－89）进行截面设计。文中有程序流程图。

不同计算方法对边坡稳定性计算影响的实例分析与研究

边坡稳定性评价是边坡工程的核心问题,是岩土工程领域的一个非常重要的课题。它在为边坡稳定性进行评价的同时,也为工程技术人员合理设计工程及整治边坡提供主要的设计依据。该文从工程实例出发,以工程计算软件为工具对常用的几种边坡稳定性计算法进行对比计算分析,研究其适用条件、计算精度,最后通过算例加以验证.从而总结出更适用于实际工程的边坡稳定性分析方法,以指导工程设计与施工。

难度系数在绩效考核领域应用的探索性研究

回顾难度系数在不同领域的研究情况,提出难度系数在绩效考核领域应用中存在的问题,并对难度系数的应用途径及计算方法进行研究。

基于GPU并行计算的智能体个性化信息系统研究

传统的智能信息系统通常使用FPGA混合串联架构进行设计,难以达到对数据进行有效采集和处理的设计要求,存在信息系统运行效果较差等局限。为解决上述问题对智能体个性化信息系统进行研究。利用GPU并行计算方法对信息系统数据进行处理,并创新了智能体个性化信息系统,在智能体个性化信息系统中有效利用GPU并行计算进行图形数据特征信号进行处理,提高对图形数据特征信息的采集和处理的能力,保障智能体个性化信息系统的有效运行。

陶瓷金属化配方的设计原则

提出了金属化配方设计原则需考虑的“三要素”和“三特性”的概念 ,指出活化剂玻璃相膨胀系数对陶瓷 金属封接强度的重要性 ,推荐日本高桥玻璃膨胀系数的计算方法。

Properties of Paths in ROBDD and Its Application to Signal Probability Calculations

The properties of the paths in an ROBDD representation of a Boolean function are presented and proved in the present paper, and the applications of ROBDD in calculating signal probability are also discussed. By this method, the troublesome calculation of the correlation among the nodes, which is caused by the re-convergent fan-out in digital system, can be avoided and power estimation can be faster than simulation-based method in [1].

Adaptive Robust Control of Multi-Machine Power Systems with Control Time Delay

The adaptive H_∞ control problem of multi-machine power system in the case of disturbances and uncertain parameters is discussed,based on a Hamiltonian model.Considered the effect of time delay during control and transmission,a Hamilton model with control time delay is established.Lyapunov-Krasovskii function is selected,and a controller which makes the system asymptotically stable is got.The controller not only achieves the stability control for nonlinear systems with time delay,but also has the ability to suppress the external disturbances and adaptive ability to system parameter perturbation.The simulation results show the effect of the controller.

Extended Symmetry of Generalized Variable-Coefficient Kadomtsev-Petviashvili Equation

In this paper, the extended symmetry of generalized variable-coeFficient Kadomtsev-Petviashvili （vcKP） equation is investigated by the extended symmetry group method with symbolic computation. Then on the basis of the extended symmetry, we can establish relation among some different kinds of vcKP equations. Thus the exact solutions of these veKP equations can be constructed via the simple veKP equations or constant-coefficient KP equations.

Lattice Reduction Aided MMSE Tomlinson-Harashima Precoding Based on VBLAST Algorithm for MIMO Systems

A lattice reduction aided (LRA) minimum mean square error (MMSE) Tomlinson-Harashima pre-coding (THP) was proposed based on vertical Bell Labs layered space time (VBLAST) algorithm for multiple input multiple output (MIMO) systems. The extended channel was used to provide optimal tradeoff between residual interference and noise amplification. The processing based on lattice reduction method helps achieve maximal diversity order. The VBLAST algorithm was applied to get the optimal processing ordering for successive interference cancellation (SIC) at transmitter. Simulation results show that the proposed algorithm outperforms conventional THP and the LRA zero-forcing (ZF) THP with full diversity order.

Analysis of Properties of Thrust Bearing in Ship Propulsion System

Thrust bearing is a key component of the propulsion system of a ship. It transfers the propulsive forces from the propeller to the ship＇s hull, allowing the propeller to push the ship ahead. The performance of a thrust bearing pad is critical. When the thrust bearing becomes damaged, it can cause the ship to lose power and can also affect its operational safety. For this paper, the distribution of the pressure field of a thrust pad was calculated with numerical method, applying Reynolds equation. Thrust bearing properties for loads were analyzed, given variations in outlet thickness of the pad and variations between the load and the slope of the pad. It was noticed that the distribution of pressure was uneven. As a result, increases of both the outlet thickness and the slope coefficient of the pad were able to improve load beating capability.

Numerical Approach for the Live Load Distribution in Road Bridges

The numerical method for computing the live load distribution coefficients in bridge decks is presented. The grillage analogy for representation of bridge decks is adopted in determining the general behavior under traffic loads. The principles of Maxwell＇s reciprocal theorem are developed in computing live load distribution coefficients and their influence lines. The presented method uses the approach developed in traditional methods of transversal live load distribution but bridge decks are modeled more realistic with the help of well-established grillage analogy. Simple numerical programs for grillage analysis can be used and no special software is needed. While computing the distribution coefficients for a bridge deck the rest of the analysis can be performed with habitual procedures of structural mechanics.

Mining Frequent Closed Itemsets in Large High Dimensional Data

Large high-dimensional data have posed great challenges to existing algorithms for frequent itemsets mining.To solve the problem,a hybrid method,consisting of a novel row enumeration algorithm and a column enumeration algorithm,is proposed.The intention of the hybrid method is to decompose the mining task into two subtasks and then choose appropriate algorithms to solve them respectively.The novel algorithm,i.e.,Inter-transaction is based on the characteristic that there are few common items between or among long transactions.In addition,an optimization technique is adopted to improve the performance of the intersection of bit-vectors.Experiments on synthetic data show that our method achieves high performance in large high-dimensional data.

丙烯酸装置中界面测量系统分析——浮力式测量的温度修正方法

本文对丙烯酸装置中萃取塔界面测量系统进行了全面分析，对用浮力式液面计测量界面的原理、系统的误差、温度补偿公式和原理进行了研究探讨。对其温度补偿公式中的系数计算方法进行了推算、反证。为界面测量系统在智能仪表与集散控制系统中应用温度补偿技术提供了计算方法。

Scaled boundary isogeometric analysis for 2D elastostatics

A new numerical method,scaled boundary isogeometric analysis(SBIGA)combining the concept of the scaled boundary finite element method(SBFEM)and the isogeometric analysis(IGA),is proposed in this study for 2D elastostatic problems with both homogenous and inhomogeneous essential boundary conditions.Scaled boundary isogeometric transformation is established at a specified scaling center with boundary isogeometric representation identical to the design model imported from CAD system,which can be automatically refined without communication with the original system and keeping geometry invariability.The field variable,that is,displacement,is constructed by the same basis as boundary isogeometric description keeping analytical features in radial direction.A Lagrange multiplier scheme is suggested to impose the inhomogeneous essential boundary conditions.The new proposed method holds the semi-analytical feature inherited from SBFEM,that is,discretization only on boundaries rather than the entire domain,and isogeometric boundary geometry from IGA,which further increases the accuracy of the solution.Numerical examples,including circular cavity in full plane,Timoshenko beam with inhomogenous boundary conditions and infinite plate with circular hole subjected to remotely tension,demonstrate that SBIGA can be applied efficiently to elastostatic problems with various boundary conditions,and powerful in accuracy of solution and less degrees of freedom(DOF)can be achieved in SBIGA than other methods.

An embedded estimating equation for the additive risk model with biased-sampling data

This paper presents a novel class of semiparametric estimating functions for the additive model with right-censored data that are obtained from general biased-sampling. The new estimator can be obtained using a weighted estimating equation for the covariate coefficients, by embedding the biased-sampling data into left-truncated and right-censored data. The asymptotic properties(consistency and asymptotic normality) of the proposed estimator are derived via the modern empirical processes theory. Based on the cumulative residual processes, we also propose graphical and numerical methods to assess the adequacy of the additive risk model.The good finite-sample performance of the proposed estimator is demonstrated by simulation studies and two applications of real datasets.

Design and implementation of a software architecture for 3D-DDA

The three-dimensional discontinuous deformation analysis(3D-DDA) is a promising numerical method for both static and dynamic analyses of rock systems. Lacking mature software, its popularity is far behind its ability. To address this problem, this paper presents a new software architecture from a software engineering viewpoint. Based on 3D-DDA characteristics, the implementation of the proposed architecture has the following merits. Firstly, the software architecture separates data, computing, visualization, and signal control into individual modules. Secondly, data storage and parallel access are fully considered for different conditions. Thirdly, an open computing framework is provided which supports most numerical computing methods; common tools for equation solving and parallel computing are provided for further development. Fourthly, efficient visualization functions are provided by integrating a variety of visualization algorithms. A user-friendly graphical user interface is designed to improve the user experience. Finally, through a set of examples, the software is verified against both analytical solutions and the original code by Dr. Shi Gen Hua.

Stair and Step Soliton Solutions of the Integrable (2+1) and (3+1)-Dimensional Boiti-Leon-Manna-Pempinelli Equations

The multiple exp-function method is a new approach to obtain multiple wave solutions of nonlinear partial differential equations (NLPDEs). By this method one can obtain multi-soliton solutions of NLPDEs. In this paper, using computer algebra systems, we apply the multiple exp-function method to construct the exact multiple wave solutions of a (2+1)-dimensional Boiti-Leon-Manna-Pempinelli equation. Also, we extend the equation to a (3+1)-dimensional case and obtain some exact solutions for the new equation by applying the multiple exp-function method. By these applications, we obtain single-wave, double-wave and multi-wave solutions for these equations.

Approximating Stationary Statistical Properties

It is well-known that physical laws for large chaotic dynamical systems are revealed statistically.Many times these statistical properties of the system must be approximated numerically.The main contribution of this manuscript is to provide simple and natural criterions on numerical methods (temporal and spatial discretization) that are able to capture the stationary statistical properties of the underlying dissipative chaotic dynamical systems asymptotically.The result on temporal approximation is a recent finding of the author,and the result on spatial approximation is a new one.Applications to the infinite Prandtl number model for convection and the barotropic quasi-geostrophic model are also discussed.