冷藏系统相变储能装置结构设计

针对目前中型冷藏系统温度浮动大,耗电量高等缺点,提出了基于相变储能技术的冷藏系统,根据现有冷藏系统 的特点,介绍了储能装置的工作原理,设计了相变储能装置的结构;采用高效的换能结构实现储能装置的能量交换;设计 了复合保温层结构和密封结构以降低能量损耗;设计了储能装置的温度监控系统以及冷量记录功能;创新性提出储能装 置的结构参数设计方法。该系统不仅可以满足供冷平稳、节省耗电的要求,且可以作为标准单元串联使用,为相变储能 装置应用于生产和实践打下基础。     

Is trust in leadership a mediator between transformational leadership and in-role performance among small-scale factory workers?

Globalization and the transformation of the organizational scene are increasing the pressure and threshold for employees to constantly perform maximum output. As such, the measure of success for many organizations is determined by their productivity level. Therefore, we believe that the leadership style adopted by the leader and the level of trust subordinates have in such a leader may be salient in determining the level of in-role performance of the subordinates in question. This study therefore tries to shed light on this issue by testing the hypotheses that transformational leadership and trust in leadership would significantly predict in-role performance, and that trust in leadership would further mediate the relationship between transformational leadership and in-role performance. A sample of 170 factory workers (subordinates) and 6 supervisors participated in the study. The subordinates completed measures of transformational leadership and trust in leadership while that of in-role performance of these subordinates was based on the ratings of their immediate supervisors. The results of the Hierarchical Multiple Regression showed that only transformational leadership positively predicted in-role performance, whereas trust in leadership failed to predict or even mediate this relationship. The study discussed the implications of the findings, limitations, and suggestions for prospective research.     

Sequential Monte Carlo for counting vertex covers in general graphs

In this paper we describe a sequential importance sampling (SIS) procedure for counting the number of vertex covers in general graphs. The optimal SIS proposal distribution is the uniform over a suitably restricted set, but is not implementable. We will consider two proposal distributions as approximations to the optimal. Both proposals are based on randomization techniques. The first randomization is the classic probability model of random graphs, and in fact, the resulting SIS algorithm shows polynomial complexity for random graphs. The second randomization introduces a probabilistic relaxation technique that uses Dynamic Programming. The numerical experiments show that the resulting SIS algorithm enjoys excellent practical performance in comparison with existing methods. In particular the method is compared with cachet—an exact model counter, and the state of the art SampleSearch, which is based on Belief Networks and importance sampling.     

Compulsive gambling and the law: From sin to vice to disease

The idea that compulsive gambling is a disease is in direct conflict with the dominant view in the law that gambling is a vice. Under the traditional view individuals who gamble to excess are morally weak and deserving of punishment. The recognition of pathological gambling as an official mental disease or disorder by the American Psychiatric Association in 1980 created an irreconcilable contention: American law never punishes an individual for being sick. The conflict can be seen in every area of the law and even between judges sitting in the same courtroom. The most dramatic disputes have been over the insanity defense; but, the disease argument has been raised, sometimes successfully, in other criminal cases, to mitigate sentencing, in attorney disbarments, tax cases, bankruptcies, divorces, personal injury claims, and, most significantly, in claims against casinos. The legal disputes will spread and become even more heated as the disease diagnosis becomes more generally accepted.     

Presentation of methods applied in the projection of infant mortality

The author describes a variety of analytical equations which attempt to determine the major factors influencing infant mortality in Poland during the period 1960-1980. The models' values for forecasting future trends in infant mortality are then discussed.     

The similarity of changes in mortality by age and their relevance to demographic projections

The similarity in mortality trends for both sexes in Poland for the period 1960-1980 is noted using correlation coefficients. The relevance of these trends for making future population projections is examined.     

On the Nature of Toddlers' Helping: Helping or Interest in Others' Activity?

Toddlers' helping has been interpreted as early evidence of cooperation and altruism. We consider whether this important social activity might, instead, be due to toddlers' interest in participating in the activity of others, and we illustrate this possibility with diary observations of infants' social and communicative development. This alternative view of toddlers' helping as one manifestation of a more‐general tendency for social engagement requires a different approach to the explanation of this aspect of social development. We argue for a relational developmental systems account of the emergence and further development of infants' social and emotional engagement leading to toddlers' helping.     

Signatures in Markov-Modulated Processes

□ In recent years, signatures are widely used for analysis of coherent systems consisting of unreliable components. If component lifetimes are independent and identically distributed, then system lifetime distribution function is a convex combination of distribution functions of order statistics for component lifetimes. Coefficients of this convex combination are called signatures. This article considers the case when a system operates in a so-called random environment, i.e., component failure rates are jointly modulated by a finite-state continuous-time Markov chain. In this model, component lifetimes remain exchangeable. An expression for distribution function of time to system failure is derived. Here, a crucial role is played by an elaborated procedure of deriving a distribution function of order statistics for system component lifetimes. A numerical example illustrates the suggested approach and analyzes the influence of random environment on the distribution function of system lifetime.