压型钢板受力蒙皮作用的有限元简化分析

采用ANSYS结构分析程序的四节点壳单元对压型钢板及等效的正交各向异性板进行了线弹性分析,结果表明在压型钢板受力蒙皮作用的有限元分析中正交各向异性板可以取代真实压型板进行分析,并得到了等效的正交各向异性板的弹性常数计算公式。     

WTO-DSU专家组程序发展中面临问题探讨

专家组程序在WTO争端解决机制中居于核心地位,其影响非常巨大。随着专家组程序的运行,很多缺陷和不足也暴露出来,本文着重就专家组的组成、专家组程序的法律特征、专家组的职能、专家组程序暴露出来的问题及其完善与发展几个方面进行探讨并提出一些个人的观点。     

Beyond a reading disability: comments on the need to examine the full spectrum of abilities/disabilities of the atypical dyslexic brain

A panel of practioners and researchers convened to consider how to advance a broader understanding of the neurocognitive profile of people with dyslexia. While a great deal of research has been conducted on the reading process, the panel recognized that the “dyslexia brain” may be unique in other ways as well. In particular, the panel focused on complex nonverbal/spatial skills and correlated attributes such as career choice. The conclusion of the panel was that there is more to be learned about how people with dyslexia reason spatially and how these qualities manifest in academic, personal, and career behaviors.     

高温气候重载水泥混凝土路面典型结构受力特性研究

为了解高温气候条件下重载水泥混凝土路面结构受力特征,本文以福建省高温气候条件与重载交通特性为研究实体,采用三维有限元程序EverFE2.24计算高温气候下重载交通对路面的影响.研究结果表明,高温气候下重载交通对水泥混凝土路面造成的不利影响,降低了路面寿命.各参数对面板的受力敏感性分析结果表明,增加面板的厚度、提高地基刚度及设置传力杆,均能有效改善面板的受力性能,其中增加面板厚度带来的受力性能改善的效果最显著.此外,增大基层厚度,在减少了车辆荷载应力的同时,也增大了面板的温度应力,因此对于改善面板受力特性不一定有效.     

自动观光车仪表盘人机界面原理分析

无人驾驶汽车由于无须乘坐者对车辆实施监控,只能通过汽车仪表面板的显示了解车辆信息,其人机界面的设计就尤为重要。对无人驾驶汽车的仪表面板的人机界面设计原理作了简要阐述,就显示装置在自动观光汽车面板中的选用、设计、布局作了简要探讨。     

An Examination of the Replicability of Angoff Standard Setting Results Within a Generalizability Theory Framework

Evidence of stable standard setting results over panels or occasions is an important part of the validity argument for an established cut score. Unfortunately, due to the high cost of convening multiple panels of content experts, standards often are based on the recommendation from a single panel of judges. This approach implicitly assumes that the variability across panels will be modest, but little evidence is available to support this assertion. This article examines the stability of Angoff standard setting results across panels. Data were collected for six independent standard setting exercises, with three panels participating in each exercise. The results show that although in some cases the panel effect is negligible, for four of the six data sets the panel facet represented a large portion of the overall error variance. Ignoring the often hidden panel/occasion facet can result in artificially optimistic estimates of the cut score stability. Results based on a single panel should not be viewed as a reasonable estimate of the results that would be found over multiple panels. Instead, the variability seen in a single panel can best be viewed as a lower bound of the expected variability when the exercise is replicated.     

Ratings in the Research Assessment Exercise 2001 – the Patterns of University Status and Panel Membership

Ratings awarded to university departments in the UK Research Assessment Exercise (RAE) 2001 were analysed to determine whether they were influenced either by the status of the university (pre‐1992 or post‐1992) or by whether the university was represented on the panel that determined the ratings. There was little evidence that panel membership has any effect on ratings, but an analysis of covariance also showed that, among universities not on the panel, pre‐1992 universities were more favourably assessed, relative to post‐1992 universities, than would be expected on the basis of their ratings in the 1996 RAE. This finding, along with the preponderance of pre‐1992 universities on all panels (even those where the majority of the research is conducted by post‐1992 universities), is used to urge strongly that in future RAEs, panel membership should be made much more representative of higher education in general and of the institutions submitting the research considered by each panel in particular.     

An Alternative Teaching Method for the Regulation of the Immune Response

A panel board containing missing information about the regulation of the immune response was devised as a teaching aid to help students understand and learn about the subject. Forty-seven students, divided into small groups, had to fill in the missing information on the panel board. At the end of the activity, each student answered an evaluation questionnaire. Forty-four students (93.6%) affirmed that the panel board helped them to consolidate learning and 38 (80.9%) said that their interest in the subject matter was aroused by the presentation.     

Engineering education using a remote laboratory through the Internet

An experiment using real hardware and under real test conditions can be remotely conducted by engineering students and other interested individuals in the world via the Internet and with the capability of live video streaming from the test site. The presentation of this innovative experiment refers to the determination of the current voltage characteristic curve of a photovoltaic panel installed on the roof of a laboratory, facing south and with the ability to alter its tilt angle, using a closed loop servo motor mounted on the horizontal axis of the panel. The user has the sense of a direct contact with the system since they can intervene and alter the tilt of the panel and get a live visual feedback besides the remote instrumentation panel. The whole procedure takes a few seconds to complete and the characteristic curve is displayed in a chart giving the student and anyone else interested the chance to analyse the results and understand the respective theory; meanwhile, the test data are stored in a file for future use. This type of remote experiment could be used for distance education, training, part-time study and to help students with disabilities to participate in a laboratory environment.     

论发展大学与中小学伙伴合作关系的途径

以全国性课程改革为契机,通过教育实习、教育培训、建立研究团队和“学习共同体”发展大学与中小学合作伙伴关系。大学与中小学合作以教育实习为纽带,深入教育实践第一线;通过教育培训,统一大学与中小学合作意识与思想;建立研究团队,在合作中加强理论与实践的联系;建立“学习共同体”,巩固合作伙伴关系的稳定性。促进学校间的交流、合作及相互发展。     

帆板控制系统的设计与实现

该控制系统采用STM32F103RCT6为主控制器,利用外部按键输入可以调节风扇转速,调节风力大小,进而控制帆板转角,采用PID算法控制电风扇转速．利用SCA61T实现对帆板角度的检测,并在液晶屏上实时显示．测试结果表明控制效果良好．     

不同位置辐射板的供冷性能分析

分析了辐射板布置位置对供冷性能的影响,建立了一种对流与辐射耦合的CFD模拟模型.通过模拟计算,得到不同辐射板位置和室内热源状况下辐射板供冷能力及室内热环境的分布状况;该模拟结果与真实平台实验结果基本吻合.模拟结果表明：当室内热源温度较低时,对流换热量为主导因素,因此应将辐射板放置于侧墙或天花板处;当室内热源温度较高时,辐射板与热源的辐射换热量增大,辐射换热量为主导因素,因此应将辐射板布置在靠近高温热源的位置.     

基于面板数据分位数回归模型的房地产价格分析

采用安徽省13个地市2001～2010年的面板数据,对影响安徽省房地产价格的因素进行实证分析。研究结果表明：银行年度基准贷款利率和房屋销售面积与房地产价格不存在协整关系,用面板数据模型及分位数回归模型分析的结果均表明人均可支配收入对房地产价格影响的弹性最大。最后提出3点政策性建议,为政府调控房地产市场价格作参考。     

Evaluating the Operational Feasibility of Using Subsets of Items to Recommend Minimal Competency Cut Scores

Establishing cut scores using the Angoff method requires panelists to evaluate every item on a test and make a probability judgment. This can be time-consuming when there are large numbers of items on the test. Previous research using resampling studies suggest that it is possible to recommend stable Angoff-based cut score estimates using a content-stratified subset of ?45 items. Recommendations from earlier work were directly applied in this study in two operational standard-setting meetings. Angoff cut scores from two panels of raters were collected at each study, wherein one panel established the cut score based on the entire test, and another comparable panel first used a proportionally stratified subset of 45 items, and subsequently used the entire test in recommending the cut scores. The cut scores recommended for the subset of items were compared to the cut scores recommended based on the entire test for the same panel, and a comparable independent panel. Results from both studies suggest that cut scores recommended using a subset of items are comparable (i.e., within one standard error) to the cut score estimates from the full test.     

Strength and Toughness of Steel Fibre Reinforced Reactive Powder Concrete Under Blast Loading

The blast resistance of structures used in buildings needs to be investigated due to the increased threat of a terrorist attack. The damage done by Composition B or Powergel to steel fibre reinforced reactive powder concrete (SFRPC) panels and ordinary reinforced concrete (RC) panels of equivalent static flexural strength is compared. A 0.5 kg charge was detonated at a distance of 0.1 m from the 1.3 m×1.0 m×0. 1 m (thick) panels, which were simply supported and spaning 1.3m. Dynamic displacement measurements, high-speed video recording and visual examination of the panels for spall and breach were undertaken. The SFRPC panels withstood the bare charge blast better than the reinforced ordinary concrete panels. Neither type of panel was breached using a 0.5 kg charge. The RC panel exhibited more spalling when Composition B was used. Under successive Composition B loading conditions, the RC panel was breached. In comparison the SFRPC panel was not breached. Exposure to fragmenting charge loading conditions confirmed these performance differences between the SFRPC panel and the reinforced ordinary concrete panel.     

Internationalization of the Counseling Profession: Meaning, Scope and Concerns

The present study sought to clarify the meaning and delineate the scope of internationalization of the counseling profession. Using a qualitative approach, the study recruited a panel of eight experts to help generate a consensus statement on the meaning of internationalization to the counseling profession and to delineate a five-theme scope of internationalization. The panel further highlighted concerns about some aspects of the process of internationalization, related to promoting U.S./Euro-centrism, as well as recognizing positive progress that is culturally respectful and beneficial for the counseling profession across the world, including the United States.     

基于CAE技术汽车覆盖件冲压成形仿真研究

介绍了覆盖件冲压成形仿真理论以及冲压工艺,对冲压仿真流程进行了阐述。采用CAE技术ETA\Dynaform对某汽车盒形件进行模拟仿真,分析仿真结果,对其中的影响因素压边力和拉延筋进行了改进和确定。通过使用仿真方法,对板料的冲压成形及时进行观察和了解,针对成形后可能出现的缺陷问题,提出解决方案。在模具结构设计阶段改进局部结构,缩短了模具设计开发周期,提高板料利用率,为汽车覆盖件冲压成形提供技术支撑。     

Higher education institutions’ costs and efficiency: Taking the decomposition a further step

A multiproduct cost function is estimated for English higher education institutions using a panel of data from recent years. The panel approach allows estimation by means of a random parameter stochastic frontier model which provides considerable new insights in that it allows the impact on costs of inter-institutional differences in the cost function itself to be distinguished from inter-institutional differences in efficiency. The approach used here therefore resembles in some respects the non-parametric methods of efficiency evaluation. We report also on measures of average incremental cost of provision and on returns to scale and scope.     

轻钢龙骨组合墙体抗剪承载力计算方法研究

将轻钢龙骨组合墙体分解成骨架结构和蒙面板,分别进行水平荷载作用下的变形及受力性能分析,再将蒙面板离散成单块板单元,通过单元分析及应用平衡原理,推导出了蒙面板抗剪承载力计算公式,计算结果与试验结果比较表明,此公式合理、安全可靠、简单实用,可供工程设计参考.     

超磁致伸缩平面扬声器阻抗特性研究

对超磁致伸缩平面扬声器的阻抗特性进行了实验研究和等效电路分析,通过恒流法测试其阻抗特性。结果表明:超磁致伸缩平面扬声器的阻抗随着频率的变化趋势类似于高损耗电感,不存在动圈式扬声器阻抗特性的低频谐振峰。还讨论了与之相配接的功率放大器的幅频均衡问题。