汽车变速器CAE仿真与试验分析     

赖俊  梅自元 《清远职业技术学院学报》2020,(1):51-54

变速器作为汽车动力总成系统的关键部件,其功能的可靠、耐久的长短等性能直接影响到汽车的整体功能。CAE仿真与试验是变速箱性能验证的重要手段,通过结合设计阶段的CAE仿真与样件阶段的试验验证进行对比研究,能够使变速器在量产前完善设计,减少试验的样本量,从而实现缩短变速器设计周期和降低成本的目的。  相似文献   

低应变法检测桥梁嵌岩桩的评价     

瞿俊 《安徽职业技术学院学报》2004,3(4):17-19

用低应变法检测嵌岩桩 ,若桩底出现明显同相反射 ,多数因桩底缺陷引起。而区分是桩还是持力层的缺陷 ,主要看反射的起跳时间在 2 L/ C之前还是之后。当桩的变径及入岩反射对测试影响很大时 ,应进一步用钻芯法检验。  相似文献   

Steps Toward More Effective Implementation of the Standards for Educational and Psychological Testing     

Daniel Koretz 《Educational Measurement》2006,25(3):46-50

The goal of the Standards for Educational and Psychological Testing is to improve testing practices, but their impact on practice appears spotty. Self-regulation clearly fails in some instances. The establishment of an external agency to oversee testing practices and adherence to the Standards would face substantial hurdles, and the ambiguity of many of the Standards would hobble such an organization if one were created. Many of the Standards are general statements of principle, and past controversies make clear that we in the field often disagree about the reasons for them, their applicability to specific cases, and their practical meaning in specific contexts. This paper argues that the field should follow two approaches to lessen this ambiguity. First, using journals, conferences, and other vehicles, we should foster more frequent and more protracted debate about the practical meaning of key Standards, such as 13.6 and 13.7, which mandate that a decision that will have a "major impact" on a student should not be based on a single score. Second, future revisions of the Standards should use concrete examples of testing practices to clarify the meaning of the Standards, much as the legal system uses case law to clarify the meaning of the general principles embodied in statutes .  相似文献   

投篮质量评价标准建立及应用     

刘小湘 《体育科研》2002,23(3):29-30

分析按命中率评价投篮质量这一方法不利于运动队 (员 )之间投篮水平的变化及技战术水平发挥程度的比较。提出了将投篮按结果不同分为 A、B、C、D四级 ,用于定量分析投篮技术水平的新的投篮质量评价标准 ,介绍了新的投篮质量评价标准在 CBA决赛阶段的应用。  相似文献   

从事物特性的相互作用本质看运动生物力学研究方法与测试手段的发展     

王小虹  程湘南 《体育科研》2003,24(5):46-49

从任何事物的特性都是由相互作用相互联系的的事物双方共同决定的这一哲学原理来看,运动生物力学的研究方法和测试手段发展具有主动性,它能够从运动中的人体引申出这样或那样的特性来,能够引申出何种特性不仅取决于运动中的人体,也取决于研究方法和测试手段,从而推动运动生物力学学科的发展。  相似文献   

On Applicable Methods in Testing Spoken English     

Wang Bao 《当代文化与教育研究》2007,(12):37-40

The importance of raising speaking ability of the students is more and more emphasized. But the pity is that, until present time, teachers or testers have to face the perplexity of lacking useful ways to test the students about their ability in speaking. In order to break through the existing perplexity, the author tries, by analyzing the applicability of several methods for testing this ability, to shade a new light in this field, thus facilitate the means of daily teaching and learning evaluation.  相似文献   

武汉体育学院学生身体素质测试指标、方法和结果研究     

程序  程茜  马良宏 《武汉体育学院学报》2005,39(12):82-84

研究分析武汉体育学院学生身体素质测试指标、方法、过程与结果。结合体育院校学生特点,对学生身体素质指标进行了测试,并就选择学生身体素质测试的原则、依据、测试指标的构建和方法的确立等进行探讨。制订身体素质测试指标和评价标准,结果表明:学生身体素质测试指标与评价标准符合在校学生身体素质的实际,达到了预期的目的与效果。  相似文献   

"信息检索与利用"网络课程辅助系统--智能测试系统的设计   总被引：1，自引：0，他引：1  

王永丽  王伟  沈秀丽 《现代图书情报技术》2004,(4):75-77,74

对智能测试系统的开发进行了详细介绍，提出并实现了该系统的两个重要部分——题库系统和网上考试系统，题库系统中的标准化试题系统、试卷系统对提高教学质量起到推动性作用。网上考试系统具有智能性特点。  相似文献   

Creating Better Learners Through Learning Science: A Sample of Methods     

Chris Brown 《图书馆管理杂志》2018,58(4):375-381

This article proposes the incorporation of learning science into the programming and operation of public libraries. Learning science, a multidisciplinary field spanning cognitive science, psychology, neuroscience, economics, anthropology, and linguistics, has identified proven methods for enhancing learning at any age. The article highlights some of the tools and insights that are most relevant to libraries in their role as centers for informal learning.  相似文献   

Maximal heart rate declines linearly with age independent of cardiorespiratory fitness levels     

Cemal Ozemek  Mitchell H. Whaley  W. Holmes Finch  Leonard A. Kaminsky 《European Journal of Sport Science》2017,17(5):563-570

There have been many conflicting observations between the linear or curvilinear decline in maximal heart rate (HR_max) with age. The aim of this study was to determine if linear or curvilinear equations would better describe the decline in HR_max with age in individuals of differing cardiorespiratory fitness (CRF) levels. Treadmill cardiopulmonary exercise test (CPX) results from participants (1510 men and 1134 women; 18–76 years) free of overt cardiovascular disease were retrospectively examined using cross-sectional and longitudinal study designs. Participants completing ≥2 CPX with ≥1 year between test dates were included in the longitudinal analysis (325 men and 150 women). Linear and quadratic regressions were applied to age and HR_max for the whole cohort and respective CRF groups (high, moderate, and low, relative to age and gender normative values). To test for differences among linear, quadratic, and polynomial equations, the change in R² (cross-sectional analysis) and Bayesian information criterion (BIC) (longitudinal analysis) from the linear to the more complex models were calculated. The quadratic or polynomial regression in the cross-sectional analysis, marginally improved the variance in HR_max explained by age compared to the linear regression for the whole cohort (0.2%), moderate fit group (0.3%), and low fit group (0.8%). With no improvements in the high fit group. BIC did not improve for any CRF category in the longitudinal analysis. In conclusion, the minimal differences among linear, quadratic, and polynomial equations in the respective CRF groups, emphasizes the use of linear prediction equations to estimate HR_max.  相似文献