工程施工招标实践与探讨

本文通过海口美兰机场供油工程施工招标的实践，着重分析探讨了建设工程施工招标过程中几个重要环节值得注意的问题。     

招标单位在招标中应注意的几个问题

通过对招投标法律、法规的综合学习，说明了实行招投标的意义、招标的基本原则和一般技巧，并结合个人参加招投标活动的经验和体会，总结出了招投标过程中应注意的问题，对规范项目招标具有一定的指导意义。     

企业自行招标存在的问题及对策

通过对目前企业自行招标的现状进行综合分析,指出了企业自行招标存在的问题,并对问题的本质进行了分析,提出了相应的对策,对我国目前实行的企业自行招标具有一定的指导意义.     

电子化招标采购系统构建研究

该文阐述了电子化招标采购系统的内涵及优点，并详细介绍了一个招标中心电子化招标采购系统构建过程。     

设备招标管理

设备采购招标的根本目的在于获得最优的性价比，为此，必须对设备招标的关键环节进行控制。该文介绍了招投标在设备采购中的应用范围，论述了技术方案的制定、招标文件的编制、评标工作的组织等设备招标管理的关键环节。     

矿业公司工程招标的现状、存在问题及对策

首先总结矿业公司工程的特点,依据新《招投标实施条例》,多角度剖析当前矿业公司招标存在的重要问题,如邀请招标现象突出等,最后针对性地提出了按法律法规确定招标方式和全过程监督等几点措施,以利于规范矿业公司招标现状,加速其招标国际化进程。     

招标采购在天钢物资采购中的实践

介绍了招标采购工作的重要性，招标采购在天钢物资采购中的实践，对招标采购实践的效益进行了分析。     

湘钢集中招标管理的实践

湘钢招标工作始于1999年，于2002年组建成立了公司招标中心，对全公司超过5万元以上物资、工程、技改项目实施了集中统一招标采购。两年来．湘钢不仅降低了采购成本，实现了采购经济效益的最大化，而且起到了加强廉政建设、净化市场经济环境的作用。     

高校图书采购招标工作的质量控制

分析了目前高校图书采购招标工作中出现的过分追求高折让、图书品种满足率低、售后服务不到位等问题，提出了要注重书商实力、重视质量要求、严格履约措施、加强沟通磨合等一系列提高图书采购招标工作质量的控制措施。     

谈成都无缝招标采购实践

攀钢集团成都无缝钢管公司将招标投标制度引入到采购工作中，通过近两年的摸索和尝试，取得了一些成绩和经验，据不完全统计，２００１年公司开展招标项目１０４项，节约资金１３２３万元，降低率达１３％，为公司降本增效发挥了重要作用，我们的主要作法如下：一、建立机构和制度我们以《招投标法》为指导思想，结合企业招标的根本目标，设计、规范企业招标业务流程。首先公司设立了“招标委员会”，由总经理任主任，公司各分管领导任委员，供应、财务、技术、质量、生产等部门负责人组成，招标办公室设在监察审计部，在物资采购部门成立了…     

赣南钨矿山资源状况调查与思考

通过赣南钨矿山资源调查,反映钨矿山资源状况不容乐观。据地质报告中统计,赣南累计探明WO3储量149.98万t,其中上平衡表113.67万t,而保有储量仅有46.7万t;国有钨矿山保有储量26.4万t,可利用的储量10.4万t,可服务年限大都在10a以下。因此,建议尽快对赣南的国有钨矿山开展新一轮的地质找矿,寻找新的接替基地,控制钨矿产量,对尾砂综合回收和利用。     

Optimum Design of Welded Steel Plate Girder Bridges Using a Genetic Algorithm with Elitism

The genetic algorithm (GA) is a general optimization technique that has some unique features that are especially suitable for structural engineering problems. This work uses a simple GA with elitism to find the optimum design of welded steel plate girder bridges. The objectives are to minimize the weight and the cost of the girders. Two types of plate-girder bridges are studied: a single-span bridge and a two-equal-span continuous bridge. Bridges with various span lengths, in increments of 20?ft, are investigated; results are tabulated, parametric studies are made, and meaningful conclusions are drawn.     

矿产资源定价方法的实证研究

文中分析了资源－环境－经济一体化核算的研究现状及存在的问题,界定了矿产资源核算的内涵及其对象,论述了矿产资源定价的理论基础,探讨了矿产资源的各种定价方法及其优缺点,适用范围,建立相应的估价模型,并进行了实证分析,这项研究对我国的资源－－环境－经济一体化核算的理论研究与实践进展具有重要的理论意义和现实意义。     

无缝钢管中非金属夹杂物特性研究

峰位于4869 eV位置,对应于元素锡的四价氧化态。锡泥中含有的主要成分为SnO2。     

浅谈推行标准化操作的实践

针对推标工作的指导思想、基本原则、基本步骤、具体做法、实施措施、工作速度,制定了有效办法,保证了推标工作的有序进行,克服了推标工作的随机育目性,在岗位操作标准制定时,打破以往三大进修规程的理论体系强,岗位操作弱的特点,抓典型、树样板、以点带面、以面推动全局。     

Stability and Accuracy of Weighted Four-Point Implicit Finite Difference Schemes for Open Channel Flow

The unsteady motion of streams, with a free surface, has been described by a system of equations that were proposed by Saint-Venant in 1871. These are universally known as “Saint-Venant’s equations.” Weighted four-point implicit finite difference schemes are largely used for their numerical solution in the case of one-dimensional flow. For these models, stability, dissipation, and dispersion are first investigated by looking at the truncation error and then by using Fourier’s classic linear analysis. Variations of the space and time weighting coefficients, the Courant number, the Froude number, and the frictional resistance term are examined in this paper. In particular, instabilities are analyzed that are due to the progressive accumulation of dispersion errors, which are the consequence of an increasing frictional resistance term. However, in this case the numerical scheme requires a dissipation mechanism. Computational suggestions are given for this mechanism.     

k–ε Turbulence Modeling of Density Currents Developing Two Dimensionally on a Slope

Dense underflows developing two dimensionally on a slope are simulated numerically. The k–ε model is used for the turbulence closure. The boundary-layer approximation renders the governing equations in the form of parabolic partial differential equations, which are easier to solve numerically than elliptic equations. Evolution of vertical structures of dense underflows is computed along the streamwise direction. Excellent similarity collapses of the computed vertical structures are obtained. The computed profiles of velocity and concentration are compared with measured data, resulting in good agreement. The impact of a parameter representing the stratification level in the k–ε model is investigated. Appropriate values of this parameter, yielding results that are nearly identical to the integral model, are proposed. Water entrainment coefficients are estimated from computed solutions, and are observed to fall within the range of previous measurements. Finally, by using the collapsed vertical structures, profile constants defined in the integral model are calculated, which assures that the top-hat assumption necessary for deriving the integral model is valid.     

QC22—20—25／400燃气锅炉存在问题与技术改造

燃气锅炉中普遍使用的多管式燃烧器,在燃用炼铁高工气时,会产生积灰堵塞、火焰中心后移而导致的过热蒸汽温度偏高等一系列问题,分析了产生这些问题的原因,在不改动锅炉结构及受压元件的前提下,对燃烧器做了改造,比较了改造前后的运行参数,并总结了成功的经验及改造中的不足。     

Evaluation of Uplift Interpretation Criteria for Drilled Shaft Capacity

Representative interpretation criteria are examined to evaluate the capacity of drilled shaft foundations under axial uplift loading. A wide variety of uplift load test data are used, and these data are divided into drained and undrained databases. The interpretation criteria are applied to these load test data to establish a consistent uplift interpretation criterion. The results are comparable for both drained and undrained loading. In general, the undrained load test results show somewhat less variability than the drained results. Based on these analyses, the QL2, Q0.5in, and slope tangent methods are the more reliable and consistent, and specific design recommendations for the interpretation of uplift drilled shaft load test are given, in terms of both capacity and displacement.     

Satisfactions and interests.

The problem of defining satisfaction and the difficulties in distinguishing interests and satisfactions are indicated. "Aside from the final, consummatory activity, satisfaction cannot be identified in terms of activities, as can interests… . Because opinion items are not as stable as interest items, it is doubtful that they can be as useful as interest items in predicting future behavior." 5 characteristics of interests are that they: are acquired, are persistent, vary in intensity, function in acceptance-rejection behavior, are indicated in readiness to act. "Interest tests are diagnostic because no two persons have acquired the same lists of activities nor are the activities classified in the same manner as liked or disliked. Moreover, people engaged in an occupation have to a marked degree similar interests, and so people in one occupation can be differentiated from members of other occupations." Major topics are: job satisfaction and job success; opinion, attitude, interest, and satisfaction; measurement of motivation. (PsycINFO Database Record (c) 2010 APA, all rights reserved)