多自由度刚性杆系静平衡计算     

沈健  董达善 《上海海事大学学报》2003,24(2):146-149

介绍了多自由度刚性杆系静平衡的分析计算。通过调整初始设计中杆件的长度来优化系统。这对于大型起重机前大梁拉杆系统以及一些相关系统的设计优化有一定的实际参考及应用价值  相似文献   

体育多种预测方法的比较研究     

李瑞文  蔡忠建  姜伯乐 《北京体育大学学报》2004,27(12):1654-1656

运用3种不同的方法所建立的多元回归预测模型,其回归预测值的准确度均达到了99.26%以上,其回归的预测值与实际值的方差分析检验均呈无差异性,P》0.50水平.说明3种不同的方法所建立的预测模型的预测值均具有显著性意义.在3种建模方法中,均有评价作用,且其评价目的也不尽相同.在体育运动实践中可依据研究的目的,选择建模方法,以提高体育预测研究的效益.  相似文献   

我国普通高校体育教学多元智能评价模式的构建   总被引：4，自引：0，他引：4  

王健  王耀文  王云杰 《山西师大体育学院学报》2006,21(2):74-77

多元智能评价理论是将多元智能理论的理念运用到评价中的理论结果。通过对我国普通高校体育教学评价中存在问题的分析,以多元智能评价理论的观点加以弥补,并提供构建多元智能评价模式的依据,试图构建出多元智能评价模式,以使体育教学评价更加符合素质教育的理念,为我国高校体育教学评价的改革提供理论上的参考。  相似文献   

多元化业余训练的实践和探讨   总被引：1，自引：0，他引：1  

肖宁  姜金奎  缪晖  丁文慧 《湖北体育科技》2003,22(4):421-423

通过一个基层体校依托社会所进行的多元化业余训练的实践，探讨我国业余训练工作如何寻求更广阔的生存和发展空间。  相似文献   

企业投资风险的成因及其防范     

唐伟  刘延博 《锦州师范学院学报(哲学社会科学版)》2006,28(4):96-98

在市场经济条件下，投资活动是企业财务活动中重要的环节，投资的正确与否决定着企业的生存与发展。企业投资后，由于内外部诸多不确定因素的存在，投入资金的实际使用效果很可能偏离预期的结果。分散投资风险是防范控制资金使用风险的主要途径之一，能使企业把资金投向收益高、回收快、风险小的项目上去，对企业的生存和发展至关重要。  相似文献   

当今图书馆员继续承诺回归方程的构建   总被引：2，自引：0，他引：2  

徐建华  李超  陈高腾 《图书情报工作》2008,52(4):14-14

本文以多元线性回归为数据分析手段,建立了以当今图书馆员继续承诺为因变量的回归方程模型。该模型的自变量涉及四类,分别是：1、人口学基本信息：馆级领导,进馆5年以内,年龄31-40、51-60,东北地区,研究馆员;2、快乐指数因子：目标价值体验,身体健康体验;3、工作满意度因子：组织氛围满意度,公平满意度;4、快乐程度自评：未来五年与目前的快乐自评。并尝试对这些因子的影响进行了分析  相似文献   

Coordinating multiple representations of polynomials: What do patterns in students' solution strategies reveal?     

《Learning and Instruction》2017

We investigate the strategies used by 64 advanced secondary mathematics students to identify whether a given pair of polynomial representations (graphs, tables, or equations) corresponded to the same function on an assessment of coordinating representations. Participants also completed assessments of domain-related knowledge and background skills. Cluster analysis of strategies by representation pair revealed patterns in the participants' strategy use. Two clusters were identifiable on tasks that required matching equations to graphs and graphs to tables. We identified overlap between these two clusters, suggesting that while the representation pair influenced strategy choice, there was also a general distinction between students who used more and less sophisticated strategies. However, students who used more sophisticated coordination strategies were similar to the others on measures of domain-specific knowledge or background skills. We consider implications for future investigations testing interventions to promote coordinating representations.  相似文献   

英汉多个疑问词的句法分布     

唐燕玲  唐科 《湖南第一师范学报》2015,(2)

一个句子的焦点是句子语义的重心所在。疑问词是疑问句的语义重心，因而疑问句的焦点就是疑问词。本文以焦点和突显观为理论依据，考察了英汉多个疑问词在特指问句中的句法位置，揭示出在特指问句中英语多个wh-词移位和汉语多个疑问词原位的原因。英语特指问句中多个wh-词必须有一个移至句首，这是其自身显性的焦点性和突显性的结果。  相似文献   

Key somatic variables associated with,and differences between the 4 swimming strokes     

Alan M. Nevill  Yassine Negra  Tony D. Myers  Senda Sammoud  Helmi Chaabene 《Journal of sports sciences》2020,38(7):787-794

ABSTRACT

This study identified key somatic and demographic characteristics that benefit all swimmers and, at the same time, identified further characteristics that benefit only specific swimming strokes. Three hundred sixty-three competitive-level swimmers (male [n = 202]; female [n = 161]) participated in the study. We adopted a multiplicative, allometric regression model to identify the key characteristics associated with 100 m swimming speeds (controlling for age). The model was refined using backward elimination. Characteristics that benefited some but not all strokes were identified by introducing stroke-by-predictor variable interactions. The regression analysis revealed 7 “common” characteristics that benefited all swimmers suggesting that all swimmers benefit from having less body fat, broad shoulders and hips, a greater arm span (but shorter lower arms) and greater forearm girths with smaller relaxed arm girths. The 4 stroke-specific characteristics reveal that backstroke swimmers benefit from longer backs, a finding that can be likened to boats with longer hulls also travel faster through the water. Other stroke-by-predictor variable interactions (taken together) identified that butterfly swimmers are characterized by greater muscularity in the lower legs. These results highlight the importance of considering somatic and demographic characteristics of young swimmers for talent identification purposes (i.e., to ensure that swimmers realize their most appropriate strokes).  相似文献   

多元智力理论在计算机基础教育学生评价体系中的应用     

倪玉华  李玫  郑义 《实验室研究与探索》2007,(12)

随着计算机及应用技术的迅猛发展,使用计算机的能力已成为当代大学生知识结构的重要组成部分。多元智力理论的提出引发了教育的新革命,把多元智力理论引入计算机教育学生评价体系已经成为计算机基础教育前进的突破口。  相似文献