碘量法测铜中物质性质和分析操作

本文讨论了碘量法测定铜量中一些有关物质的特性,以及这些性质对分析条件和操作的要求。     

ZRS-6.72-3型电收尘器技术改造

ZRS-6．72—3型电收尘器原设计用于13．8kt／a锌冶炼烟气收尘制酸工艺中，因电收尘器使用时间长，电源控制柜故障率高和沸腾炉扩大更新，对电收尘器同步进行配套技术改造。改造为CRS-8．24—3型电收尘器后，又陆续使用了HL-Ⅲ型恒流源控制电柜，投产后的电收尘器具有收尘效率高、电场运行稳定等特点。     

On the dynamics of non-linear viscoelastic solids with material moduli that depend upon pressure

We investigate the dynamic response, of a generalization of an incompressible Kelvin-Voigt viscoelastic solid, whose viscosity depends on the pressure. Bodies with pressure-dependent material moduli have relevance to numerous technologically significant problems in geomechanics, the mechanics of granular media and powder compaction. We obtain analytical results for creep and recovery phenomena as well as solutions to the propagation of waves in such bodies. We are able to obtain explicit exact solutions that clearly illustrate the marked difference in the response of bodies with pressure-dependent material moduli as opposed to their counterparts whose moduli do not depend on the pressure. We also show that the governing equations for such materials can change type, and that their solutions exhibit singularities and localization.     

基于分形理论的供应链管理模型分析

为了克服日益复杂的供应链问题,在分形理论的基础上介绍了分形供应链的概念和特点,认为分形供应链所具有的自相似、自组织、自优化等特点可以很好地提高供应链的灵活性,增强适应环境的能力.在此基础上进一步研究了分形供应链的结构模型和运作模型,探讨了其现实意义.     

Allowables-Based Flow Curves for Nonlinear Finite-Element Analysis

A methodology for developing allowables-based stress versus strain relationships for metal alloys is presented. The approach incorporates Federal Aviation Administration/Department of Defense (FAA/DoD) Metallic Materials Property Development and Standardization (MMPDS) statistically derived material properties for tensile yield and ultimate strengths to derive flow curves at room or elevated temperature with an A-, B-, or S-Basis probability. The resulting flow curves may be used for new designs to comply with Federal Air Regulations as well as for forensic investigations and failure analysis.     

山西东南部水电自供区系统网架构建方案探讨

提出山西省东南部水电自供区系统网架构建方案 ,对实施步骤 ,电量供应和平衡、调度通讯以及效益等作了分析和论证 ,对方案的必要性和可行性进行了探讨 ,对以后发展提出了建议     

Strategic appraisal of energy models for Mozambique

The needs that an energy supply system must meet are constantly changing, due to technological, social and political reasons. Effective energy planning is a dynamic process that is repeated periodically and adjusts to changing conditions. Energy decision makers and planners are no longer able to rely on inductive decision making since they have to investigate the effect of various decision parameters and possible future changes. To help in this process, models have been developed where estimates of future load growth, candidate power plants, fuels and other key factors can be introduced, from which the planners can evaluate decision parameters and the available alternatives. The paper presents the different methodologies and practices that are used by 11 energy models for energy demand forecasting, supply side management and generation expansion planning, demand side management and integrated resource planning. The paper concludes to the presentation of a strategic appraisal of the examined energy models appropriate for energy planning in Mozambique. Three models are proposed for conducting demand forecasting, generation expansion planning and demand side management. Copyright © 2002 John Wiley & Sons, Ltd.     

高科技企业的供应链管理特点研究

高科技企业的供应链管理研究对于指导高科技企业的运作具有重要意义。本文从建立供应链合作伙伴关系、建立适应高科技企业发展的分销渠道、合理的组织间交易激励政策的设计、供应链流程的优化和集成等四个方面对高科技企业的供应链管理进行了论述。     

论给水变频控制系统在100MW机组中的应用

引用某热电厂100MW机组给水系统的变频改造实际运行和测试结果，证明在电厂给水系统中应用给水变频控制系统进行改造是切实可行的。不仅可以有效改善系统自动化水平和控制品质，而且可以取得良好的经济效益。     

一种基于TDA16846的新型有源功率校正电路设计

介绍一种由集成电路芯片TDA16846完成的利用电荷泵(Charge Pump)实现的有源功率因数校正(APFC)技术。这种APFC电路的突出优点就是结构简单,通过对常规缓冲电路进行合理调整,可以很容易变成具有PFC功能的高性能开关电源。分析了APFC的工作原理,应用专用芯片TDA16846设计了电路图,并阐述了主要元件的功能。经实验证明,推荐电路设计合理,应用前景广阔。