人力资源质量成长链及其多级混成研究

基于社会系统工程思想,本文首先提出了人力资源质量成长环和成长链的概念,然后分析了人力资源质量的多级混成过程。     

离心流化床中多孔介质干燥的传热传质研究

通过对典型的多孔湿物料在离心流化床中干燥过程的理论分析,将含湿多孔介质传热传质过程和物料与气流之间的外部传递过程相耦合,导出了离心流化床的控制方程组,在此基础上,可以对离心流化床中湿物料的干燥过程进行数值模拟。     

Variance estimation for the 2006 French housing survey

In the 2006 French housing survey, information is collected on many aspects of housing to describe the housing stock in France and the housing conditions of French households. The basic national sample results from a multistage sampling design. Complementary samples were selected to perform accurate estimations for socio-demographic domains. Some French regions proceeded to a regional and local extension of the national sample. The variance is estimated for a region with a regional and local extension of the basic national sample.     

Dose-Response Analysis Using Spreadsheets

The task of fitting dose-response models to experimental data can be performed using a spreadsheet with a built-in optimization engine. This paper shows how the task of point and interval estimation can be performed using Microsoft EXCEL. A case study is presented on the carcinogenic dose-response behavior of chloroform.     

水泵调节方法与节能的研究

本文叙述了水泵运行中为何要进行调节、节流调节和变速调节的理论方法和不同调节方法的优缺点，重点分析了变速调节的节能原理及调速范围，并指出了变速调节中易出现的错误，对有些文献中关于相似抛物线的混淆之处进行了讨论，提出了不同看法，并用一实例对两种调节方法进行了分析比较．     

小型CO2热泵系统的搭建与性能研究

天然工质CO2以其优良的热物理性能和友好的环境特性成为热泵系统中运行工质最有潜力的替代物之一。为了加快CO2作为制冷剂向实用化产品迈进,采用CO2作为制冷剂,确定了跨临界C02热泵系统方案及工况,对气体冷却器、蒸发器及辅助部件进行了选型设计,并最终搭建了一个带回热器的跨临界C02热泵系统实验台,该试验台结构紧凑,制造、运行成本较低。同时文章中就冷却水、冷冻水对系统性能的影响做了初步研究。研究表明：提高冷冻水流量对提高热泵出水温度的影响很小;提高冷却水流量可以有效提高能效比EEER,并对制取高温热水有很大帮助,但是同时会增加流动阻力。     

压裂泵柱塞密封副有限元分析

用有限单元法对OPI-1800AWS型压裂泵柱塞密封副进行了有限元分析,获得了橡胶密封圈与柱塞之间接触应力的分布规律以及接触应力与工作介质压力的关系。计算表明:橡胶密封圈在工作介质压力的作用下,有“偏离效应”的存在。即在密封圈的接触宽度上,唇部受拉伸,根部受压缩,主密封在靠近唇部位置;同时,主密封带的位置不随介质压力的变化而变化,且最大接触应力与工作介质压力之比为1.23。所有这些为润滑状态和密封机理的分析提供了计算依据,同时为密封圈结构设计提供了新的认识和理论依据     

An Integrated Scenario Ensemble-Based Framework for Hurricane Evacuation Modeling: Part 1—Decision Support System

This article introduces a new integrated scenario-based evacuation (ISE) framework to support hurricane evacuation decision making. It explicitly captures the dynamics, uncertainty, and human–natural system interactions that are fundamental to the challenge of hurricane evacuation, but have not been fully captured in previous formal evacuation models. The hazard is represented with an ensemble of probabilistic scenarios, population behavior with a dynamic decision model, and traffic with a dynamic user equilibrium model. The components are integrated in a multistage stochastic programming model that minimizes risk and travel times to provide a tree of evacuation order recommendations and an evaluation of the risk and travel time performance for that solution. The ISE framework recommendations offer an advance in the state of the art because they: (1) are based on an integrated hazard assessment (designed to ultimately include inland flooding), (2) explicitly balance the sometimes competing objectives of minimizing risk and minimizing travel time, (3) offer a well-hedged solution that is robust under the range of ways the hurricane might evolve, and (4) leverage the substantial value of increasing information (or decreasing degree of uncertainty) over the course of a hurricane event. A case study for Hurricane Isabel (2003) in eastern North Carolina is presented to demonstrate how the framework is applied, the type of results it can provide, and how it compares to available methods of a single scenario deterministic analysis and a two-stage stochastic program.     

液压调剖堵水泵研制

液压调剖堵水泵是一种液压驱动的双缸单作用往复泵。最高工作压力为 2 5 MPa,最大排量为 12 m3/ h。该泵压力平稳 ,工作可靠。在注入介质的固相含量高达 45 %时仍能正常工作 ,注入介质中的聚合物粘度保持率可达 99%以上。经油田现场使用表明 ,该泵是目前我国调剖堵水施工中最理想的注入设备     

“写作即翻译”与同伴反馈法结合之实证研究

同伴反馈法在英语写作教学中有着不可替代的作用,但是自身也有其局限性,为了弥补其重技巧、轻能力、指导性的不足,本文基于"同伴反馈"与"写作即翻译"教学法的结合,对学生进行了一次系统的问卷调查,并通过定量统计与定性分析,以期从现象与本质两方面了解学生对两种教学法结合的态度。结论表明:总体上学生对该教学手段持肯定态度,部分学生提出了建议,少数学生持否定或中立态度。此实验为本教学法的后期改进与完善提供了理论与数据上的参考。