催化动力学荧光法测定甲醛

随着室内装修材料的使用,甲醛成为室内空气严重污染物。测定甲醛的常用方法有多种,本文介绍了如何基于在硫酸介质中,甲醛有阻抑过氧化氢氧化罗丹明B的催化作用,建立催化荧光动力学分析法测定甲醛的新方法。     

X射线荧光光谱法测定铸铝合金主元素含量

原有的铸铝方法具有明显的弊端,已经不能够适用于目前的铸铝要求,其只有进行创新和改革才能够满足铸铝的要求。目前研究主要针对利用X射线荧光光谱法对铸铝合金主元素含量进行测定,在实验过程中,主要对选择的合适样表进行参数的测定,同时在后期建立适合的方法对测验的结果进行有效的检验,只有保证测定的准确性,才能够使得铸铝的质量得到明显的提高,同时能够极大的提高铸铝合金的工作效率,缩短试验的有效周期,满足现今铸铝合金的要求。本文就X射线荧光光谱法测定铸铝合金主元素含量进行了简要的研究,仅供参考。     

集合功能的测定浅析

本文根据笔者的实践体会和理论积累对集合功能的测定问题进行分析. 一、集合近点距离的测定 其基本原理是测出两眼使用最大集合力量时,两视轴交点到眼的距离,即集合近点距离.它反映双眼的基本集合能力正常与否.     

工匠精神融入技工院校环保专业课程实践研究

如何把工匠精神融入专业课程体系,以培养德技并修的高素质技能人才,是技工院校发展的一个热点问题。本文以工匠精神融入“环境监测理化指标的进阶测定”废水中COD的测定的课程设计为例,从实训室管理与建设、工学结合活动和教学设计三方面探讨融入工匠精神的具体内容和方法。     

那一刻,印度洋哀伤如隔世

灾难突发 2004年12月26日上午,北京时间8时58分,印度尼西亚苏门答腊岛西北近海(北纬3.9度、东经95.9度)发生近40年来世界上最强烈的地震,震中距海岸约30公里.印尼棉兰气象和地理局测定震级为里氏8.1级,中国地震台网测定震级为里氏8.7级,美国地震监测网测定为里氏8.9级,后美国地质勘探局又将测定的震级改为里氏9.0级.北京时间12时21分,印尼科巴群岛西南海域(北纬6.8度、东经92.8度)又发生7.5级地震.两次地震发生海域相距约450公里.美国地质调查局已经根据震级把此次地震列为有纪录以来的第五大地震.     

水中悬浮物质光学测定方法评价

指出测定浊度的必要性,简述三种测定方法,并提出采用多方向散射光式测定法的优点。     

水处理中二氧化氯的应用

介绍ClO_2的产生、测定、消毒及净水效果、对三氯甲烷的控制和与臭氧的比较。     

新形势下农林院校物理学立体教学初探

物理学是关于自然界最基本形态的科学。由于物理学所研究的物质运动形态和运动定律具有最基本和最普遍的性质，使得物理学的基本知识成为研究其他自然科学所不可缺少的基础。农学的发展同样离不开物理学，尤其到了现阶段，越来越多的新理论、新技术进入了农学领域，这些新理论、新技术几乎都与物理学有关。例如利用电阻法来测定植物的抗逆性，荧光法测定化学成分，比色法测定叶绿素含量，电泳法测定酶谱等等，这些都与物理学有关。物理理论对农学的发展，同样也起着举足轻重的作用。例如牛胃内部容易形成泡沫，影响牛的进食，可根据液体表面性质的物理原理来解决这个问题。     

职场锐词

匹配入职 匹配入职,指的是员工入职后对本职岗位和单位的环境氛围比较适应和满意的一种状态。 “匹配”可以用一种量化的方法来测定,测定分析的内容主要包括个性能力评估、企业匹配度、同事匹配度、团队报告、匹配公司图表和匹配职业等方面,测试结果会以图表的形式告诉求职者与公司及其企业文化的匹配程度。     

分光光度法快速测定重油裂解催化剂中含镍量

介绍快速测定重油裂解催化剂中含镍量的丁二酮肟镍分光光度法的仪器与试剂、试验原理、测定方法、结果与讨论。     

Strategic Groups and Rent Dissipation

We consider a rent-seeking contest in which players can form strategic groups before expending their outlays. We examine the profitability of endogenous group formation and the effect of such group formation on rent dissipation. We show the following: When just one strategic group is formed in equilibrium, group formation is beneficial both to the group members and to the nonmembers, and rent dissipation is smaller than with usual individual rent seeking. However, when more than two strategic groups are formed in equilibrium, group formation is never profitable to any players, and rent dissipation is greater than with individual rent seeking.     

Two-Player Asymmetric Contests with Ratio-Form Contest Success Functions

I examine players' equilibrium effort levels in two-player asymmetric contests with ratio-form contest success functions. I first characterize the Nash equilibrium of the simultaneous-move game. I show that the equilibrium effort ratio is equal to the valuation ratio, and that the prize dissipation ratios for the players are the same. I also show that the prize dissipation ratio for each player is less than or equal to the minimum of the players' probabilities of winning at the Nash equilibrium and thus never exceeds a half. Then I examine how the equilibrium effort ratio, the prize dissipation ratios, and the players' equilibrium effort levels respond when the players' valuations for the prize or their abilities change.     

CONTEST DESIGN: AN EXPERIMENTAL INVESTIGATION

This paper experimentally compares the performance of four simultaneous lottery contests: a grand contest, two multiple prize settings (equal and unequal prizes), and a contest which consists of two subcontests. Consistent with the theory, the grand contest generates the highest effort levels among all simultaneous contests. In multi‐prize settings, equal prizes produce lower efforts than unequal prizes. The results also support the argument that joint contests generate higher efforts than an equivalent number of subcontests. Contrary to the theory, there is significant over‐dissipation. This over‐dissipation can be partially explained by strong endowment size effects. Subjects who receive higher endowments tend to over‐dissipate, whereas such over‐dissipation disappears when the endowments are lower. This behavior is consistent with the predictions of a quantal response equilibrium. We also find that less risk‐averse subjects over‐dissipate more. (JEL C72, C91, D72)     

自组织理论视野中的高职课堂教学

课堂教学是高职院校人才培养的主要渠道,直接影响人才培养的质量。高职课堂教学系统是教育系统和社会系统的一个子系统,是由学生、教师、教材、教学环境以及教学目标等要素结合成的复杂系统,它符合自组织理论中普利高津对耗散性结构形成条件的要求。在自组织理论下,高职课堂教学具有开放性、目的性、整体性以及流动性。     

Can High Prices Ensure Product Quality When Buyers do not Know the Sellers' Cost?

The 1981 Klein-Leffler model of product quality does not explain why high-quality firms would dissipate the rents they earn from quality-assuring price premia, and it relies on consumers knowing the cost functions of firms. In the present article, consumers do not know any firm's cost of producing quality goods, so firms with a low cost of producing high quality engage in conspicuous spending to demonstrate they earn a profitable mark-up over cost. Complete rent dissipation does occur if such firms have the same cost of producing low-quality items as other firms that are worse at producing high quality.     

A genealogy of the disabled identity in relation to work and sexuality

That 'disability' has been central to the formation of the ideal liberal citizen in the modern era can be effectively illuminated by focusing on two prime modes of subjectification, work and sexuality. This paper seeks to demonstrate that a better understanding of their historical involvement in the creation of the disabled identity and their manifestation in recent times in the form of welfare reform and sexual rehabilitation can pave the way for the development of more effective pathways of liberation.

The purpose of history, guided by genealogy, is not to discover the roots of our identity but to commit itself to its dissipation. (Foucault, 1977a, p. 162)

     

SLEEPING WITH THE ENEMY: THE ECONOMIC COST OF INTERNAL ENVIRONMENTAL CONFLICTS

This paper extends the literature on collective rent‐seeking by introducing the possibility that a competing group may be a subset of another. We develop a model that incorporates the potential for some individuals to be party of both sides of a conflict, which creates interdependence of payoffs. Results indicate that strategic individual behavior, and the resulting rent dissipation, is affected by the relative size of the groups. We conduct an experimental test of the model and find that observed laboratory behavior corresponds well with the game‐theoretic comparative‐static predictions. (JEL C72, C9, Q5, D74)     

Institutionalizing dissent: The United States structure of political opportunity and the end of the nuclear freeze movement

This article uses the recent nuclear freeze movement as a vehicle for analyzing the ways in which United States political institutions cope with dissident movements. Building on the literature on political opportunity structure, I argue that United States political institutions reflect James Madison's strategy for coping with dissent by fragmenting political power. The Madisonian structure of United States government, by providing relatively easy institutional access to some challengers and numerous venues for often ritualized participation, serves to fragment, coopt, and dissipate dissident movements. I identify three complementary components of the process of fragmentation and dissipation: marginalization, depoliticization, and institutionalization. I then examine the political implications of institutionalization in the case of the nuclear freeze movement with a discussion of the movement's influence on policy. I conclude with a call for more comparative research on the process and political impact of institutionalizing social protest movements.     

CONTESTS WITH DRAWS: AXIOMATIZATION AND EQUILIBRIUM

We introduce and axiomatize a class of single‐winner contest success functions that embody the possibility of a draw. We then analyze the game of contest that our success functions induce, having different prizes delivered in the occurrence of a win and a draw. We identify conditions for the existence and uniqueness of a symmetric interior Nash equilibrium and show that equilibrium efforts and equilibrium rent dissipation can be larger than in a Tullock contest (with no possibility of a draw) due to increased competition even if the draw‐prize is null. These results suggest that a contest designer may profit from introducing the possibility of a draw. Finally, we show that this approach naturally extends to multiprize contests with multiple draws across different subsets of the set of players. (JEL C72, D72, D74)     

The 2002 Winter Olympics scandal: rent-seeking and committees

In the wake of a judging controversy at the Winter 2002 Olympic games, the governing council of the International Skating Union scrapped its judging system, replacing it with a new system which uses scores from only some of the judges, selected randomly. This means that the composition of the awarding committee is unknown. I examine rent-seeking expenditures when the composition of the committee is unknown relative to the case when it is known. When the composition of the committee is unknown, I find that rent-seeking expenditures directed towards each committee member may fall but aggregate rent-seeking expenditures will not fall. I find the counter-intuitive result that there may be no change in the rent-seeking effort directed at each committee member, even if it is known that some of the members will not be part of the final awarding committee. The results hinge on whether there is full rent dissipation or rent under-dissipation when the composition of the committee is known.