接触电势差与光电效应实验的讨论

本文通过对一道光电效应计算题的讨论，说明在考虑接触电势差的情况下确定遏止电压的真正值应注意的问题，进而说明遏止电压Vg跟入射光频率v的关系式eVg＝hv-w的意义．     

试论射门技术在足球比赛中的应用

本文主要通过对射门技术性原理的研究，结合射门技术的要素，射门的区域性，有效性及射门的战略等方面，对射门技术在比赛中的运用进行了较深入的探讨。     

加大辽东半岛海洋经济区开发力度的现实论证

根据《全国海洋经济发展规划纲要》,辽东半岛将成为全国海洋区域经济开发、东北老工业基地振兴和大连创建东北亚重要国际航运中心的重要依托。为此,必须发挥其综合优势,建设全国性的海洋经济先导区;巩固其产业优势,加快辽宁海洋经济发展步伐;做好区域开发的政策安排,加速其开发进程。     

清道咸时期中朝文人交往方式探析——以李尚迪为中心

清代中朝文人交往的方式主要有三个方面：第一,留京期间,中朝文人宴游唱和,以画纪事,写真留影;第二,临别之际,两国文人常以画图题赠,表达相思怀念之情;第三,在分别后,中朝文人通过互赠和互寄书籍、器物、诗作等方式,表达问候,以慰相思。由此可见,清代以来中朝之间日益紧密的文化交流,增进了两国人民的了解和友谊,成为中外文化交流史中的佳话。     

Staking the claims of identity: Purism,linguistics and the media in post‐1990 Germany1

The paper examines one of the major metalinguistic debates in post‐war Germany: the debate about the influence of English on German, an issue which was raised in the 1990s in the German media and has dominated media discussions on language ever since. The analysis demonstrates that the debate is deeply embedded in current socio‐political discourses as well as in long‐term discursive traditions concerning, on the one hand, the socio‐political changes following German reunification in 1989/90, which involved a revision of the concepts of nation and nationalism, and, on the other, the genesis of the concept of nation, which is closely bound up with the history of the educated bourgeoisie and the process of standardisation as well as linguistic purism. It is argued that the debate on Anglicisms, as is the case in many other metalinguistic debates, cannot be regarded in isolation from the socio‐political environment and the context of historical usage within which it is embedded.     

Estimating Contaminant Dose for Intermittent Dermal Contact: Model Development, Testing, and Application

Assessments of aggregate exposure to pesticides and other surface contamination in residential environments are often driven by assumptions about dermal contacts. Accurately predicting cumulative doses from realistic skin contact scenarios requires characterization of exposure scenarios, skin surface loading and unloading rates, and contaminant movement through the epidermis. In this article we (1) develop and test a finite-difference model of contaminant transport through the epidermis; (2) develop archetypal exposure scenarios based on behavioral data to estimate characteristic loading and unloading rates; and (3) quantify 24-hour accumulation below the epidermis by applying a Monte Carlo simulation of these archetypal exposure scenarios. The numerical model, called Transient Transport through the epiDERMis (TTDERM), allows us to account for variable exposure times and time between exposures, temporal and spatial variations in skin and compound properties, and uncertainty in model parameters. Using TTDERM we investigate the use of a macro-activity parameter (cumulative contact time) for predicting daily (24-hour) integrated uptake of pesticides during complex exposure scenarios. For characteristic child behaviors and hand loading and unloading rates, we find that a power law represents the relationship between cumulative contact time and cumulative mass transport through the skin. With almost no loss of reliability, this simple relationship can be used in place of the more complex micro-activity simulations that require activity data on one- to five-minute intervals. The methods developed in this study can be used to guide dermal exposure model refinements and exposure measurement study design.     

汉语否定处置句研究

否定是语言中普遍存在的一种现象,是语法中的重要范畴。就汉语处置句而言,根据否定词出现的位置,否定处置句可分为两种类型：否定前置处置句,否定后置处置句。这两种否定处置句的产生与处置介词语法化的句法环境有密切的关系。否定词前后位置的不同,其否定辖域及否定焦点也随之有所变化。否定词否定辖域及否定焦点和语用因素是两种否定处置句一直广泛存在于汉语方言的一个重要的内在动因,同时阿尔泰语否定词紧靠动词的语序对新疆、甘肃等地汉语方言处置句否定词的位置也有一定影响。     

抽油机曲柄销的接触强度分析

计算了在极限弯矩作用下曲柄销紧固螺栓上的预紧力,根据各载荷的影响,利用理论计算的方法得到了曲柄销锥面上的应力分布情况.同时在有限元分析软件ANSYS中建立了抽油机曲柄销、锥套、曲柄体和螺母垫片、紧固螺母的实体装配模型,并在ANSYS软件中进行了接触分析,得到了各实体的应力分布情况.将两者对比分析,有限元计算的结果与理论力学模型计算结果相吻合.根据此结果对曲柄销的转动力矩进行了计算,分析了曲柄销出现转动的原因.     

开发区发展阶段识别及差异化调控对策研究——以湖南省为例

在文献回顾及相关专家访谈基础上,提出开发区成长指数、成长速度、成长累积的概念,并设计出计算方法,以此对湖南省开发区发展阶段及调控对策进行实证研究。首先划定几个临界值识别开发区发展阶段;然后说明湖南开发区发展呈现的明显的不均匀性;最后基于不同发展阶段特征提出相关差异化调控对策。     

论欠发达地区生态示范区建设中补偿机制建设

我国的欠发达地区与生态脆弱地带具有很强的相关性，在欠发达地区建立生态示范区，是欠发达地区实现脱贫致富和可持续发展的根本途径。但欠发达地区在生态示范区建设过程中，生态环境的保护和建设会造成立接或间接的经济损失。同时，生态环境还具有明显的公共物品特性，在市场经济条件下，如果缺乏合理的补偿机制，其经济发展与生态环境保护必然不能很好地得到统一。政府相关部门应在尽可能短的时间内建立起科学的生态补偿机制，以保证欠发达地区在生态示范区建设中实现脱贫致富。