在电磁场中巧用数学之浅析

电磁场理论与数学紧密相关,在电磁场中巧用数学能使物理概念、规律和物理过程册繁就简,便于记忆和理解。抓住事物和物理过程的对称性,巧用数学解决电磁场中的类似问题,培养学生灵活运用数学处理问题的能力。     

蔑视与改造精英——世纪末小说的一大景观

本文以世纪末小说为立足点,揭示了转型期中国社会文化冲突的一大特征———颠覆精英,及其潜在的现实背景。并指出：文化痞子、城市平民、都市白领对精英的蔑视与挑战固然有其不可替代的革命意义,但如果走向另一个极端,也可能导致灾难性社会危机,因而主张各阶层的文化交流与沟通     

Proportional Trapping-Removal Model with a Known Ratio

ABSTRACT

Population size estimator is derived for a proportional trapping-removal model with a known ratio between two sub-population sizes, and the corresponding asymptotic properties is obtained. The performance of the proposed estimator is checked via simulation studies and an example.     

Sieve Estimation of Time-Varying Panel Data Models With Latent Structures

We propose a heterogeneous time-varying panel data model with a latent group structure that allows the coefficients to vary over both individuals and time. We assume that the coefficients change smoothly over time and form different unobserved groups. When treated as smooth functions of time, the individual functional coefficients are heterogeneous across groups but homogeneous within a group. We propose a penalized-sieve-estimation-based classifier-Lasso (C-Lasso) procedure to identify the individuals’ membership and to estimate the group-specific functional coefficients in a single step. The classification exhibits the desirable property of uniform consistency. The C-Lasso estimators and their post-Lasso versions achieve the oracle property so that the group-specific functional coefficients can be estimated as well as if the individuals’ membership were known. Several extensions are discussed. Simulations demonstrate excellent finite sample performance of the approach in both classification and estimation. We apply our method to study the heterogeneous trending behavior of GDP per capita across 91 countries for the period 1960–2012 and find four latent groups.     

Characterizations based on conditional expectations

For given real functionsg andh, first we give necessary and sufficient conditions such that there exists a random variableX satisfying thatE(g(X)|X≥y)=h(y)r _x (y),∀y ∈ C _x , whereC _x andT _X are the support and the failure rate function ofX, respectively. These extend the results of Ruiz and Navarro (1994) and Ghitany et al. (1995). Next we investigate necessary and sufficient conditions such thath(y)=E(g(X)|X≥y), for a given functionh. Support for this research was provided in part by the National Science Council of the Republic of China, Grant No. NSC 86-2115-M-110-014 and NSC 88-2118-M-110-001     

Is Tattooing a Risk Factor for Adolescents’ Criminal Behavior? Empirical Evidence from an Administrative Data Set of Juvenile Detainees in Taiwan

Juvenile crime affects not only the victims of the crime but also the delinquents’ future. How to prevent adolescent criminal behavior has become an important public policy issue. This study contributes to this interesting issue by examining the relationship between tattooing and adolescents’ criminal behavior. In particular, this study investigates whether or not having a tattoo/tattoos is connected to the incidence of various criminal activities, including: larceny, robbery, fraud, assault, drug use, and homicide. A unique sample of 973 juvenile detainees drawn from the administrative profiles in Taiwan and the coarsened exact matching method were utilized. Results show that compared to their nontattooed counterparts, tattooed juvenile detainees were significantly more likely to commit fraud, assault, drug abuse, and homicide by 3%, 13%, 9%, and 9%, respectively. In contrast, tattooing was not significantly associated with larceny or robbery. From a policy perspective, given the significant link between tattooing and criminal behavior, the presence of a tattoo in adolescents may serve as a valuable indicator regarding adolescents’ high probability of committing crimes.     

Determinants of consistent,timely, and active responses in corporate crises

This paper investigates the individual and combined factors affecting the extent to which corporations respond to crisis events consistently, in a timely manner, and actively. The determinants examined include public relations autonomy, legal dominance, strategic orientation, and organizational factors. A survey was conducted of communications mangers, public affairs personnel, and public relations personnel, drawn from the top 500 companies operating in Taiwan. Results indicate that the relative effect of individual sources of influence on crisis response is greatest for situations in which public relations departments have the most autonomy, followed by those where crisis management is handled with a strategic orientation, those where the legal departments dominate, and those where organizational factors provide the main avenue of address. The results emphasize the intriguing role of public relations autonomy by demonstrating its significant impact on providing a consistent, timely, and active crisis response. The strategic orientation of situation analysis also predicts a consistent response, whereas legal dominance predicts strategic ambiguity or inconsistent communication.     

解构的价值与解构主义美学思想

作为解构主义美学的核心观念．解构指向的是一种本体性的、生生不息的、蕴含着极大颠覆性与创造性的内驱力。解构产生于结构成为结构的那一刻，是对他者性召唤的肯定性应答，是对结构等级制秩序的颠覆。解构在解放他者的同时也解放了他者的对立面，它不知疲倦地从一种结构奔向另一种全新的结构，以致无穷。解构性事件就是这从一个结构转向另一个结构的关节点。解构特有的自由、民主精神使得解构主义美学成为一种批判的理论、一种肯定的理论，同时它还是一种辩证法。     

对赫哲族聚居区"十五"期间经济和社会发展的调查分析

本文作者在"十五"期间深入赫哲族聚居区,对赫哲族人民在"十五"期间经济和社会生活各方面所取得的成就进行了调查和分析,向我们展示了赫哲族在"十五"期间全面建设小康社会取得的新成就.