大型弧形闸门静力特性有限元分析

以某水电站溢洪道弧形闸门为例,建立了大型弧形闸门的有限元分析模型,应用ANSYS软件对其在各种工况下的支铰反力、闸门应力、位移挠度以及屈曲失稳等静力特性进行了计算分析,为完善闸门结构的设计提供了依据,对同类闸门结构的设计计算有参考意义。     

三线铁路荷载作用下箱梁桥荷载横向分布系数

文章运用有限元程序对三线铁路预应力混凝土连续箱梁桥进行了模拟,分析了三线铁路荷载作用下箱梁的受力特性及在各种荷载工况下荷载横向分布规律,给出了荷载横向系数的实用值。     

Simulation of water and nitrogen dynamics in soils during wastewater applications by using a finite-element model

A mathematical model was developed to simulate water movement, mass transport, and nitrogen transformations in soils during wastewater applications. The model is one-dimensional and based on the Galerkin finite-element method. The submodel of mass transport of nitrogen incorporates the convection-dispersion processes of ammonium and nitrate nitrogen, nitrification, denitrification, ammonium exchange and uptake of ammonium and nitrate ions. The accuracy and validity of the proposed model was examined by comparison with an explicit-implicit finite-difference model results. The model was used for simulation of water and nitrogen dynamics during wastewater application in homogeneous and multi-layered soils under different N concentration, rate, duration and scheduling of application.     

企业家报酬决定中市场标准的权变作用

企业家报酬的决定有着不同的标准 ,按照劳动经济学的观点 ,企业家市场薪酬决定了企业家报酬。在报酬实践中 ,市场工资率的概念也是牢固确立的。基于这种理论 ,应当实行企业家报酬的市场化 ,其实质就是企业家的工资完全由市场决定 ,而不是由政府或者某些部门统一规定     

Toxicity of Detroit River Sediment-Bound Contaminants to Ultraplankton

Four sites in the Detroit River/Lake Erie western basin were evaluated for their toxicity. The evaluation was based on 1) bulk chemical characterization of the sediments, 2) chemical composition of the sediment elutriates, and 3) toxicity of the elutriates to ultraplankton and microplankton/net plankton. A sequence of decreasing contamination was determined from the chemical composition of the elutriates based on the elutriation release of metals such as Zn, Mn, Cd, Ni, and Co. Bioassessment of elutriate toxicity was determined by carbon-14 Algal Fractionation Bioassays (AFB's) which were conducted with various dilutions of standard and Chelex-100 treated elutriates. Site A (near Windsor, Ontario) and Site D (western Lake Erie) were found to be toxic to ultraplankton. The observed toxicity was attributed to the bioavailability and synergistic impact of elutriated metals on ultraplankton production. A direct relationship between the water soluble metal fraction and toxicity was observed. These results confirmed that sediment toxicity should not be evaluated solely on bulk chemical composition of the sediments. The AFB's have been proven useful in the bioassessment of sediments due to their rapidity/sensitivity and hence could be routinely used for the screening and early detection of contaminants affecting fast growing organisms which form the basis of the aquatic food chain.     

对商誉的再探讨

商誉是无形资产中最为特殊的组成内容，过去人们封其性质和构成有不同的看法。在知识经济时代的今天，无形资产的性质和范畴认识得到深入，商誉的构成内容与无形资产的泉多组成内容有很多相同之处，商誉的实质就是多项未入账无形资产的总和。商誉的确认与计量问题也就转换为对企业自创无形资产的确认与计量，知识经济下应确认和计量对描述企业财务状况起关键作用的自创无形资产。但在不确定和充满风险的经济环境下，应积极稳妥地确认自创无形资产。自创无形资产的计量可按不同特点选择采用成本基础定价法、市场基础定价法、经济定价法。     

民俗旅游区旅游资源浅析--忻城中华土司民俗旅游区开发研究之一

通过对全国土司文化的保护和开发现状的论证，以及对忻城土司文化的定量、定性分析，从而对忻城中华土司民俗旅游区的旅游资源做出了科学的评价。     

盘山花岗岩裂隙水元素成因

作者通过对比各种成因裂隙水性质，判断表生条件下水岩地球化学作用方向，分析影响裂隙水中可溶组份含量变化的各种因素，分析裂隙水中可溶组份之间相关关系，旨在探讨盘山花岗岩裂隙水中主要元素的成因问题。     

犯罪构成与刑事诉讼及人权保障

犯罪构成是刑法的核心概念。大陆法系与英美法系的犯罪构成与刑事诉讼紧密相连 ,在动态意义上发挥了保障人权的作用。我国的犯罪构成理论排除了“有责性”和“违法性”的查证 ,缺乏有效的保障、限制机制 ,有待进一步完善。     

从会计要素看我国会计准则的国际趋同

2006年新颁企业会计准则,体现了我国会计准则国际趋同的特点.会计要素是会计体系的核心内容, 通过我国会计新旧会计准则的比较以及国内外会计准则的比较,主要从会计要素的分类、定义以及确认三大方面揭示了我国会计准则的国际趋同.