《电场》单元检测题

一、选择题1.下面关于电场的叙述正确的是()A.两个未接触的电荷发生了相互作用,一定是电场引起的B.只有电荷发生相互作用时才产生电场C.只要有电荷存在,其周围就存在电场D.A电荷受到B电荷的作用,是B电荷的电场对A电荷的作用2.两个半径相同的金属小球,带电量之比为1∶7,相距为r,两者相互接触后再放回原来的位置上,则相互作用力可能为原来的()3A..如74图1所B.示37,在xC.97D.176轴上关于原点对称放置两个带相同电量的点电荷q1和q2,则对y轴上一点P的场强的方向能作出的判断是()A.可能沿y轴正向B.可能沿y轴负向C.可能沿x轴正向4D..如可图…     

企业文化与组合创新的关系研究

在全球市场竞争日益残酷激烈和国内经济环境复杂多变的环境下,如何有效进行技术创新获得竞争优势成为企业关心的核心问题。文化作为维持竞争优势的一个源泉,对技术创新方式有着重要的影响作用。本文在借鉴前人的研究基础上,主要研究四种不同类型的文化:官僚型文化、支持型文化、革新型文化和效率型文化对于组合创新中所包含的自主创新和合作创新的不同影响。研究证实了具有不同类型企业文化的组织进行企业技术创新活动时选择创新的方式会有所不同。这些命题的提出对企业更好的选择创新方式提供了帮助,并且丰富了技术创新的理论研究。认为只有结合组织的文化正确地选择创新方式,才能更好的促进企业的创新能力,在市场竞争中增强企业的核心竞争能力。     

对高校英语阅读课教学综合模式的探讨

探讨高校英语阅读课教学综合模式,立足现实、关注细节,目的是培养大学生英语素质,实现《大学英语教学大纲》的要求。     

应严格控制科技期刊广告页

分析了社会主义市场经济体制下学术性、综合型、内向型学报模式的弊端,提出了学术性、开放型专业化和科技成果通报型两种学报模式,阐述了这两种学报模式的优点.     

高校篮球教学与训练的新方法研究

随着我国的高校体育教学改革的不断发展和深入,我国高校的篮球教学和训练方法取得了长足的进步。但是,目前我国高校篮球的教学当中还存在着一些不足,阻碍了篮球教学的进步与发展。通过对普通高校的篮球教学与训练当中所存在的问题进行剖析,为高校篮球的教学与训练提出了一些新的方法与建议,以求促进高校篮球教学与训练的顺利开展。     

Contribution of uncertainty in estimation of active drag using assisted towing method in front crawl swimming

Active drag force in swimming can be calculated from a function of five different variables: swim velocity, tow velocity, belt force, power output and exponent of velocity. The accuracy of the drag force value is dependent on the accuracy of each variable, and on the contribution of each variable to drag estimation. To calculate uncertainty in drag value, first the derivatives of the active drag equation with respect to each variable were obtained. Second, these were multiplied by the uncertainty of that variable. Twelve national age and open level swimmers were recruited to complete four free swimming and five active drag trials. The uncertainties for the free and the tow swim velocities, and for the belt force, contributed approximately 5–6% and 2–3% error, respectively, in calculation of drag. The result of the uncertainty of the velocity exponent (1.8–2.6) indicated a contribution of about 6% error in active drag. The contribution of unequal power output showed that if a power changed 7.5% between conditions, it would lead to about 30% error in calculated drag. Consequently, if a swimmer did not maintain constant power output between conditions, there would be substantial errors in the calculation of active drag.     

CICBS: a methodology and a framework for measuring and managing intellectual capital of cities. A practical application in the city of Mataró

The governments of cities have to make important decisions on the future of their communities. In the past, the vision, objectives, and goals of cities have been determined mainly by considering tangible assets as the main factors of a city's prosperity. However, in the knowledge economy, the role of intangible assets in wealth creation has become fundamental. As a result, a framework of intangible assets that allows navigation from the present reality to the future vision has become an urgent need for all cities. The paper has two well-defined parts. In the first part, it develops a specific methodology and framework for measuring and managing the intellectual capital of cities. In the second part, the study deals with the practical application of this model of intellectual capital in cities with the specific case of the city of Mataró, providing some details of the first cities’ intellectual capital report.     

Academic Functioning and Peer Influences: A Short‐Term Longitudinal Study of Network–Behavior Dynamics in Middle Adolescence

In this study, the associations between peer effects and academic functioning in middle adolescence (N = 342; 14–15 years old; 48% male) were investigated longitudinally. Similarity in achievement (grade point averages) and unexplained absences (truancy) was explained by both peer selection and peer influence, net of acceptance, and connectedness. Friendships were formed and maintained when adolescents had low levels of achievement or high levels of truancy. Friends influenced one another to increase rather than decrease in achievement and truancy. Moreover, friends’ popularity moderated peer influences in truancy in reciprocal friendships but not in unilateral friendships, whereas friends’ acceptance moderated peer influences in achievement in both unilateral and reciprocal friendships. The findings illustrate the dynamic interplay between peer effects and academic functioning.     

科技术语属性抽取方法研究*

使用共现分析的方法从术语定义抽取术语属性，然后使用对应分析的方法对科技术语和术语属性之间的关系进行分析，并使用图形作为表达方式。最后利用市场营销学科领域的科技文献进行实证研究，对市场营销的概念进行深入挖掘，发现市场营销领域学科研究重点和研究内容等有价值的信息。