Hybrid multiobjective particle swarm optimization and estimation of distribution algorithm

Multiobjective Particle Swarm Optimization & Estimation of Distribution Algorithm (MOPSO&EDA) is presented for solving multiobjective problem. During the process of optimization, half of offspring solutions are updated by the Particle Swarm Optimization (PSO) algorithm with mutation which has the ability of global search. Another half of offspring solutions are created by the Estimation of Distribution Algorithm (EDA) which has better ability of learning and local research. EDA explicitly extracts globally statistical information from the selected solutions and builds a posterior probability distribution model of promising solutions based on the extracted information. Compared with some other multiobjective algorithms, the Pareto Sets obtained by MOPSO&EDA have good convergence and diversity performance on ZDT1~ZDT3, ZDT6, ZDT6 1 instances, and the performance metrics of convergence and diversity on ZDT4 are moderate.     

Mannich Reactions of Aromaitic Aldehydes with Aromatic Amines and Aromatic Ketones

Mannich reactions of aromatic aldehydes with aromatic amines amines and aromatic ketones are performed at room temperature or slightly below in the presence of concetrated hydrochloric acid as the catalyst.Forty one new compounds are synthesized with yields of 18.9% to 92%.The effect of substituent in the ring.the amount of hydrochloric acid,reaction temperature and reaction time are systematically examined as well.     

The on line monitoring method of power transmission line fault basednon linear frequency response function

A novel method for power transmission line monitoring and fault diagnosis is proposed based on non linear frequency response analysis. The power line carrier signal has been used for on line monitoring of power transmission line. As the non linear frequency response function describes the system inherent characterization, different frequency response patterns corresponding to different operation states of transmission line can be established. Based on the analysis of transmission line characteristics of fault modes, various fault features can be extracted, thereby achieve online monitoring and fault diagnosis on transmission line. Simulation experiments show the effectiveness of the proposed method.     

An improved back projection algorithm for electrical impedance tomography

An improved mean back projection algorithm based on an isopotential back projection algorithm of electrical impedance tomography (EIT) is presented by adopting the mean back projection theory of computer tomography. The distance from the midpoint of an injected electrode pair to the midpoint of a measured electrode pair is taken as approximately the length of the projection routine which is introduced into the back projection process. The positive and negative mean values of relative conductivities obtained by back projection are computed. The final relative conductivities are the differences between the conductivity values obtained by back projection and the corresponding sign mean value. If the results change sign, they are set to zero. Simulations and phantom experiments show that fewer artifacts are present in images reconstructed by mean back projection algorithm than those reconstructed using the back projection algorithm. The improved mean back projection algorithm is more practical and effective than the back projection algorithm.     

Synthesis Mode of Stress and Strain for Complexus Theory of Geomaterials Damage

Although the constitutive model for geomaterial damage has developed significantly, there is still dispute regarding the synthesis mode of stress and strain for the complexus theory of geomaterials damage. The synthesis mode of stress and strain for the complexus theory of geomaterials damage was studied in depth in light of the basic concepts of continuum mechanics. A general synthesis mode of stress and strain for the complexus theory of geomaterials damagmall. The amount of sampling could sharply decrease by using the dual sampling method. During the comparison, the supporting role exaggeration of the line element, which is used in the FEM model to simulate the initial lining and rock bolt, was found by FEM simulation. The lining element reaction forces which were greater than usual were reported in FEM analysis results. Deeply Buried Tunnel Reliability Analysis was developed on the platform of ANSYS.     

农业网络信息资源现状与标准化思考

互联网快速延伸、农业网站超常规发展,农业网络信息标准化在信息共享和信息服务中的作用显得日益重要,已经成为迫在眉睫的问题.作者基于"华中农业信息网"(http://www.ccain.net)及其它政府、企业和科教等类农业网站资源的现状,分析了农业网络信息资源的分类、发展管理现状及存在的问题,对标准化的基础工作.如总原则、术语、信息分类、编码、采集存储提出了几点思考.     

Hopfield Network Models of Water Quality Evaluation

In this paper, a Hopfield model for complex water quality evaluation is presented using the artificial neural network for water quality evaluation. The model is examined with the practical data of water quality from Fengzui River located at Nanchuan city in Chongqing. The results show that Hopfield network is fit for water quality evaluation.     

新疆荒漠区几种旱生树种自然分布的制约因素研究

新疆荒漠区主要旱生乔灌木种群空间分布的格局,取决于这些树种本身的生命活动节律与无机生态因子的配合。例如胡杨(Populus euphratica).梭梭(Haloxylon),柽柳(Tamarix)等旱生类群,就总体而言对本区的生境是适应的,但由于具体地段无机因子的组合及其在时空分配的差异,从而制约这些植物在空间的侵移与建群过程,并在很大程度上制约其空间分布的格局。     

绿洲的界外区与干旱区生态环境建设

干旱区在开发过程中,造成绿洲、界外区及维持原状的荒漠三部分。界外区生境的极度退化,将动摇绿洲的存在基础。因而整治界外区是扭转干旱区环境恶化、实现生态复原与建设的关键。恢复与扩展荒漠植被即是生态建设的根本手段。实施保护、利用与建设相结合的方针,以荒漠植被自然侵移规律,依靠自然降水以最大限度发展可供饲用的灌林,将能实现生态环境建设的目的。     

Method for measuring shear stress-strain relationship of thin adhesive layer

This paper uses the combined bonding disc specimen, with a round end surfaces at both ends of the longitudinal adhesive joint and chamfered steel substrates hither, forms a shear stress distribution of uniform coefficient more than 0.97 and controls the normal tension stress along the bonding surfaces to a very low level. By means of the built-in high accuracy displacement measuring system of uniaxial INSTRON servo equipment, it eliminates the measuring system deformation from the measured total deformation, and then obtains the shear deformation of the joint, and eventually converts into the shear strain of the adhesive joint. The results of experiments using adhesive samples show that the bonding disc specimens are characterized by shear failure of the adhesive joint layers, so it can be thought that the method of combined bonding disc specimens can reveal the right shear properties of adhesives. The measured shear strength can be used as material strength criterion and the measured shear stress-strain relationship can be used in the load capacity analysis of bonded structural members. Because of the simplicity, the combined bonding disc specimen test method is suitable to be adopted in laboratories having displacement-controlled servo systems.