门式刚架轻型房层钢结构设计中的若干问题

通过工程设计，从结构设计角度阐述一些设计中容易忽视的问题，并探讨一些解决问题的方法。     

采用全湿法从金泥中提金的新工艺

本文针对火法炼金存在的一些问题，通过实验，提出全湿法提金的新工艺流程，实践证明，该新工艺不仅避免了火法炼金的一些问题，金的回收率也很高。     

空调系统常见问题的分析

本文通过在实际工作中发现的空调设计及运行管理的一些问题，希望这些问题的解决，给今后的设计提供一些个人借鉴。     

企业内部的有效信息沟通

目前中国企业中存在的一些因为不良信息沟通而出现的问题，阐述了有效信息沟通所需要的技巧，并通过一些国外知名企业的成功案例，说明有效信息沟通在企业中的作用。     

中型露天矿运输工艺与设备研究

本文通过对２４个中型露天矿运输工艺与设备情况的调查研究，分析了存在的问题，提出了一些设想和建议，并总结了一些矿山矿用汽车管理的经验。     

尾矿浓缩机高效化改造设想

通过对选矿厂尾矿浓缩现状和工艺的分析，对浓缩机的高效化改造提出了一些想法，从浓缩设备的改造入手，对改善环水水质，提高输送浓度提出一些措施以满足选矿生产的要求。     

光电直读光谱仪在铝及铝合金分析中的应用

通过几年来的铝及铝合金光电直读光谱分析工作，我们在分析方法、仪器维护以及仪器的简单故障排除方面有了一些经验，一些实用的措施和方法有一定的参考价值。     

板形控制液压弯辊系统的仿真

 针对板形控制液压弯辊系统，建立了电液伺服压力(油压)控制系统的数学模型，提出了适用于实际的伺服阀流量方程，考虑了一些非线性特性对系统的影响。运用软件Matlab的工具箱SIMULINK建立动态结构图很好地实现了数学模型，得出液压弯辊系统一些控制量的仿真曲线。通过改变仿真参数，得出一些参数对系统特性影响的特点。     

美国专业硕士研究生教育的发展特点及启示

本文通过对美国专业硕士研究生教育的发展历史进行分阶段介绍，分析了每个发展阶段的一些较明显的特点及存在的优势，在此基础上，希望对我国专业硕士研究生教育的发展提供一些启示和借鉴。     

耐火材料隧道窑节能监测及节能途径

窑炉的节能监测是能源管理的一个重要组成部分，其目的是通过一些参数的简便测定，及时掌握窑炉的运行情况和用能水平，找出其节能途径，介绍了耐火材料隧道窑节能监测的意义。项目和要点，以及由一些厂家生产实践归纳出的节能途径。     

The Changing Face of School Psychology: Trends in Data and Projections for the Future.

Trends in data from the past to the present are described for demographic variables (gender, race and ethnicity, preparation levels, credentialing, age and experience) and ratio of students to school psychologists. School psychology in the United States will continue to be characterized as primarily Caucasian, specialist-level and female through 2020. Projections of personnel needs based on estimates of new school psychologists entering the field through graduation from university programs, as well as those exiting the field through estimates of retirement and attrition, indicate that there will be a severe shortage of school psychologists through 2010, with the shortage then continuing but declining through 2020. Implications are discussed and possible strategies and directions are offered for the field. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

避雷器在线检测技术及其应用

通过实际的现场实践分析说明了避雷器在线检测技术原理及具备的特点、存在的问题。运用比较的方式确定目前可以利用的在线检测方式。     

Transport of Organic Contaminants in Geomembranes under Stress

The transport properties of aqueous solutions of benzene, dichloromethane, and trichloroethylene through extended polyvinyl chloride and high-density polyethylene geomembranes are investigated. It is found that extension enhances the permeation rates of the penetrants through polyvinyl chloride geomembranes, and the opposite effect is found in the case of high-density polyethylene. This difference in response is attributed to the type of structural change, which occurred as a result of the extension. The diffusivities of a mixture of the three organic solvents through the geomembranes are also determined.     

Automated Testing System for Overhead Line Cables

An automated testing system for overhead line cables with temperature control from environment temperature to 200°C is presented. The aim of the test is to determine mechanical characteristics such as creep, thermal strain, stress∕strain, fatigue, and self-damping in order to improve the design of overhead lines through the analysis of new and already-in-use cables, as well as quality control. The data are obtained through the utilization of displacement, temperature, and load sensors. The temperature and the cable tension are continuously controlled. The data acquisition, analysis, and feedback are made through an intelligent interface. The maximum load is 200 kN.     

Study of Fracture Mechanisms at Cyclic Fatigue of Steels Used in Nuclear Reactors I

This study deals with the possible reasons of nucleation and propagation of macrocracks, mesocracks, and microcracks in stainless austenitic steels after low‐cycle fatigue tests at room temperature. It is shown that macrocracks in these steels are formed only after completion of 20–30% of cycles of total deformation. Statistical analysis showed that the average length of slip bands and that of microcomponents of a macrocrack are equal, and they are always parallel to each other, that indicates their crystallographic character. Macrocracks preferably propagate through the grains with no apparent signs of plastic deformation and through isolated mesocracks, but not through mesocracks and grain boundaries.     

Sampling biases and missing data in explorations of sexual partner networks for the spread of sexually transmitted diseases

The structures of sexual partner networks are important in determining patterns of transmission of STDs including HIV. Empirical data on sexual partnerships and sexual partner networks collected through sampling individuals are a non-random sample of partnerships and network structures even if individuals are sampled randomly. This has the potential to bias estimates of measures describing the sexual partner network. In addition, biases may be introduced through non-response and missing data. Using Monte Carlo simulation, we investigate the biases that are introduced in estimates measures of the sexual partner network through three common sampling methods. The results indicate that substantial systematic biases are introduced. The direction and magnitude of these biases suggest that, by ignoring them, the risk for the establishment and persistence of infection in a population may be underestimated.     

Analysis of Adhesive-Bonded Joints, Square-End, and Spew-Fillet—High-Order Theory Approach

The analysis of adhesive-bonded joints using a closed-form high-order theory (CFHO theory) is presented, and its capabilities are demonstrated numerically for the case of single lap joints with and without a “spew-fillet.” The governing equations based on the CFHO theory are presented along with the appropriate boundary∕continuity conditions at the free edges. The joints consist of two metallic or composite laminated adherends that are interconnected through equilibrium and compatibility requirements by a 2D linear elastic adhesive layer. The CFHO theory predicts that the distributions of the displacements through the thickness of the adhesive layer are nonlinear in general (high-order effects) and are a result of not presumed displacement patterns. The spew-fillet is modeled through an equivalent tensile bar, which enables quantification of the effects of the spew-fillet size on the stress fields. Satisfactory comparisons with two-parameter elastic foundation solution (Goland-Reissner type) results and finite-element results are presented.     

Fertilization and early embryonic development in poultry

There are two major controllers of development in the early stages of bird embryos. These are: 1) gravity, probably acting through the distribution of yolk and its components, which lays down the initial plans for polarity that are later established firmly through the genes; and 2) the primitive streak, which controls the orderly ingression of the cells and imposes a pattern on the developing tissues.     

真空合成TiB_2工艺研究

本文就TiB_2的真空合成工艺进行初步探讨。采用XRD分析技术对在不同温度下的试样进行相结构组成分析;由气相色谱法测定粉末的C和O_2等杂质;通过电子探针对粉末进行扫描形貌(SEM)观察。实验表明:原料配碳(C_m)和合成温度(T)是影响粉末质量的关键因素。     

Energy-Efficient Trajectories of Unmanned Aerial Vehicles Flying through Thermals

This study presents optimal energy-efficient flight trajectories of a generic unmanned aerial vehicle (UAV) flying through a vertical moving thermal cell. A two-dimensional point-mass model of a jet-engined UAV in the vertical plane is used. UAV equations of motion and the thermal wind expression are normalized for numerical efficiency and four fundamental parameters are identified. UAV flights through a thermal cell are formulated as nonlinear optimal control problems that minimize the average thrust per unit time, subject to UAV performance constraints and periodic flight boundary conditions. These problems are converted into parameter optimizations and solved numerically. Fuel efficiencies of these optimal trajectories are compared with those of reference optimal flights in the lack of thermal winds. Both constant thrust and variable thrust solutions are obtained. Two patterns of optimal flights through thermals are identified, and their characteristics are analyzed. Both patterns of optimal flights are also explained from an energy maximization point of view. Effects of the fundamental parameters on optimal UAV flights are examined. Results suggest that significant improvements in UAV fuel consumption are possible by taking advantage of thermal energies.