基于ANYSYS的电路板组件的跌落仿真     

毛兰斌 《苏州市职业大学学报》2007,18(3):73-75

基于ANSYS/LS-DYNA的结构动力分析模块,对印刷电路板组件进行了跌落仿真分析,模拟了整个跌落撞击过程,分析不同边界条件以及封装件的布置方式对电路板组件动态响应的影响。  相似文献   

造成运动损伤的心理和社会因素分析   总被引：3，自引：0，他引：3  

吴璋 《体育科学研究》2001,5(4):27-28

对运动队的运动损伤因素进行调查,发现运动员的应激反应、个性特点、运动损伤史、心理活动、环境等心理和社会等因素也是引起损伤的重要因素,提示在运动训练中应注重运动员对这些因素的反应以及开展对这些因素影响的适应和调控训练.  相似文献   

当今世界男子100m再创新纪录的突破口   总被引：1，自引：0，他引：1  

郭洪波  徐富君  许世岩 《武汉体育学院学报》2001,35(1):101-102

用灰色数学法分析了第3、第6届世界田径锦标赛100m跑的技术参数，显示起跑反应和0～20m段的加速训练、最大速度能力和高速度保持能力的训练是再创纪录的突破口。  相似文献   

Identifying families with complex needs after an initial child abuse investigation: A comparison of demographics and needs related to domestic violence,mental health,and substance use     

《Child abuse & neglect》2017

Families with complex needs related to domestic violence, mental health, and substance use have some of the worst child protective services (CPS) outcomes. Although many of these families are identified during a CPS investigation and subsequently referred to home-based postinvestigation services (HBPS), many are re-reported to CPS, so it is important to understand the postinvestigation experiences of this vulnerable group. Therefore, this study compared families with and without complex needs to understand their uniquedemographics, needs, and postinvestigation outcomes.The sample consisted of 2008 caregivers who received HBPS following an initial CPS investigation. The Family Assessment Form (FAF) was used to measure family functioning in eight domains using a 1–5 scale with higher ratings representing worse functioning. Complex needs were indicated by a mean FAF score of 3 or higher for either domestic violence, mental health, or substance use. Using Pearson chi-square analyses and two-sample t-tests, comparisons were made between families with (n = 836) and without (n = 1172) complex needs. Half of caregivers with complex needs had a history of abuse, 25% had three to five needs, and nearly half had six to eight needs; 90% of caregivers without complex needs had zero to two needs. Furthermore, caregivers with complex needs had higher mean scores for concrete, educational, and clinical needs. These findings highlight the importance of recognizing variation among families referred to HBPS and accurate screening to ensure that families with complex needs are offered and receive services matched to their unique characteristics and needs.  相似文献   

Assessing the Sensitivity of Weighted Least Squares Model Fit Indexes to Local Dependence in Item Response Theory Models     

Anne Corinne Huggins-Manley  HyunSuk Han 《Structural equation modeling》2017,24(3):331-340

Given the relationships of item response theory (IRT) models to confirmatory factor analysis (CFA) models, IRT model misspecifications might be detectable through model fit indexes commonly used in categorical CFA. The purpose of this study is to investigate the sensitivity of weighted least squares with adjusted means and variance (WLSMV)-based root mean square error of approximation, comparative fit index, and Tucker–Lewis Index model fit indexes to IRT models that are misspecified due to local dependence (LD). It was found that WLSMV-based fit indexes have some functional relationships to parameter estimate bias in 2-parameter logistic models caused by violations of LD. Continued exploration into these functional relationships and development of LD-detection methods based on such relationships could hold much promise for providing IRT practitioners with global information on violations of local independence.  相似文献   

第五方物流理论在应急响应时效优化中的应用     

王术峰 《科技管理研究》2016,(9)

根据第五方物流系统优化理论,对第五方物流系统进行优化,构建第五方物流模型,包括第五方物流体系功能结构模型和第五方物流信息系统结构模型,从而建立应急物流保障体系,并对应急响应时效优化项目进行实证分析,对创新协同服务应急物流组织模式、运营模式、保障模式、服务模式的可能性进行具体的研究。实证分析结果表明 ,可以实现应急物流保障体系系统优化的目标,为客户提供供应链系统集成、流程优化和资源协同服务。  相似文献   

Model order reduction using response-matching technique     

S. Mukherjee  Satakshi 《Journal of The Franklin Institute》2005,342(5):503-519

A method for model order reduction is proposed using response-matching technique. The step and impulse inputs have been considered. All types of pole configurations in the original high-order and reduced low-order system are included in this paper like real, complex and repeated. The proposed method is comparable in quality with similar existing methods and is capable of generating a reduced-order model with a desired pole pattern.  相似文献   

温度脉冲进口条件对单相介质一维非傅立叶导热问题的影响     

范庆梅  卢文强 《中国科学院研究生院学报》2004,21(3):315-321

针对不同温度脉冲进口条件对非傅立叶导热问题的影响进行了模拟 ,数值预示了不同脉冲形式 ,以及不同脉冲频率产生的不同的非傅立叶导热特征 ;同时也数值预示了同一种脉冲作用下 ,热波导热、非傅立叶导热和傅立叶扩散的差别  相似文献   

轴向柱塞泵流体噪声的机理分析   总被引：2，自引：0，他引：2  

方孝荣  杜巧连  陈海荣 《科技通报》2002,18(5):424-427

以降低轴向柱塞泵流体噪声为目的，围绕轴向柱塞泵的柱塞数和轴向柱塞泵配油盘结构对产生流体噪声的机理进行了理论分析，并对降低轴向柱塞泵流体噪声的措施进行了试验。试验研究表明：对轴向柱塞泵配油盘结构进行优化设计，使柱塞腔内高压油与低压油切换时避免高、低压油突然串通而造成的压力冲击所产生的噪声，是降低轴向柱塞泵流体噪声的一条有效途径。  相似文献   

气候变化问题与我国的应对战略   总被引：2，自引：0，他引：2  

许小峰任国玉  王守荣张政 《中国软科学》2004,(1):23-27

全球气候变化是全球变化的核心问题,已经成为国际环境外交和国家可持续发展中的重大问题之一。我国政府对气候变化及其影响的重视与日俱增,已经确定了解决气候变化问题的基本原则,并初步确立了响应气候变化问题的立场和战略构想。本文从气候变化问题的由来、观测与研究的现状和问题、我国当前的政策和措施等方面,进一步思考应对气候变化影响和国际谈判的战略部署问题,并提出初步对策建议。  相似文献