大学生心理健康与体育锻炼

文章通过对大学生心理现状和影响因素的分析,结合对体育锻炼功能的探讨,得出体育锻炼对大学生心理健康有积极作用的结论.     

Determinants of short-term value creation for the bidder: evidence from France

This paper analyses bidder short-term returns of 58 takeover bids that occur between 1997 and 2005 on the French market. Furthermore, the determinants of this performance are examined to improve understanding of the sources of value creation or destruction arising from M&A. This study reports that M&A are typically friendly, horizontal transaction, and relate to the entire target capital. The event study methodology is used to estimate bidder value creation. Three findings are shown in this study. First, we find strong evidence that the announcement of a takeover bid generates significant, high returns for the bidder with prebid blockholder position in the target (toehold) versus the bidder without toehold. In this case, there is a strong presumption that the synergies’ motive is the prime reason for the offer. Second, these results show that bidders with low potential growth positively influence share price around the bid announcement. In addition, the growth profile of the target is associated with value creation for the bidder.     

An improved time-space lower bound for tautologies

We show that for all reals c and d such that c ² d<4 there exists a positive real e such that tautologies of length n cannot be decided by both a nondeterministic algorithm that runs in time n ^c , and a nondeterministic algorithm that runs in time n ^d and space n ^e . In particular, for every \(d<\sqrt[3]{4}\) there exists a positive e such that tautologies cannot be decided by a nondeterministic algorithm that runs in time n ^d and space n ^e .     

Modeling Network Management: An Examination of Internal and External Strategies

Within the last decade scholars have begun to emphasize the importance of exploring management within an inter-organizational context (O’Toole and Laurence Public Administration Review 57(1):45-52, 1997; Agranoff and McGuire 1999; O’Toole and Meier Journal of Public Administration Research and Theory 9(4): 505-526, 1999). These studies have demonstrated the importance of network management on organizational performance. However, McGuire (2002) argues that the literature on networking does not demonstrate the intricate activities of network management that lead to increased performance, asserting case studies are necessary to achieve this goal. This work uses large-n data and presents the concepts of internal and external networking as a framework for understanding how network management contributes to improved organizational performance.     

Tendencies of the Development of Public Service in Lithuania

The article analyzes the development of the Lithuanian civil service and the influence of some of the prevailing models of public management on the changes that occurred in the service. It also reviews the attitude of society and experts towards the bureaucracy and points out that in Lithuania, society is becoming more and more skeptical about politics and the whole public environment. It emphasizes that it is not easy to implement the managerial approach in the Civil Service in post-Communist states.     

The Total Marital Fertility Rate and Its Extensions

What we will call the age-based TMFR is computed conventionally by adding up age-specific marital fertility rates in the hope of estimating the number of children ever born to a woman who is married throughout her childbearing years. Demographers have long been strongly skeptical about this quantity because it normally indicates implausibly many children. Our analysis of data from the Romanian GGS confirms this finding, and we propose an alternative duration-based TMFR computed in the spirit of parity-progression ratios. At the same time, we extend the method to cover any type of living arrangement (cohabitation, marriage, non-partnered arrangement, and so on). Because each resulting total union-type fertility rate (TUFR) explicitly accounts for the living arrangement, it improves on the conventional total fertility rate (TFR), which does not. We embed the investigation in an event-history analysis with fixed and time-varying control covariates and find patterns of relative risks for such variables that reveal interesting features of childbearing behavior in the Romanian data, which we use to illustrate the method. In most cases, these patterns are quite robust against model re-specification, including the shift from the age-based to the duration-based approach. Since, the number of female respondents is ??only?? about 6,000 (minus records that cannot be used for the current purpose) in a normal single-round GGS, there is considerable inherent random variation in the data set, but we show that simple few-term moving average graduation suffices to overcome this problem.     

Can Marriage Reduce Risky Health Behavior for African-Americans?

This paper estimates whether marriage can improve health outcomes for African-Americans through changes in risky health behaviors like smoking, drinking, and drug use. Using data from the National Longitudinal Study on Adolescent Health and propensity score matching methodology to account for the potential selection bias, the results show that marriage does lead to a reduction in risky health behaviors, specifically drinking and drug use. This question has important policy implications because if marriage has the same benefits for African-Americans as it does for the general population, social welfare programs can be re-evaluated to incorporate marriage promotion, and further support can be given to programs that decrease adverse health behaviors.     

Translating family-focused prevention science into public health impact

Underage drinking is a pervasive problem in the United States, with serious consequences for youth, families, communities, and society as a whole. Family-focused preventive interventions for children and adolescents have shown potential for reducing underage drinking and other problem behaviors. Research findings indicate that clear advances have been made, in terms of both the number of evidence-based interventions available, and in the quality of the methods used to evaluate them. To fully reap the benefits of such preventive interventions and achieve public health impact, the findings of family-focused preventive intervention science must be translated into real-world, community practices. This type of translation can be enhanced through four sets of translational impact factors-effectiveness of interventions, extensiveness of their population coverage, efficiency of interventions, and engagement of eligible populations, with sustained quality intervention implementation. Findings from studies conducted by researchers at the Partnerships in Prevention Science Institute and other empirical work highlight the importance of these factors. A model for community- university partnerships has been developed that potentially can facilitate the dissemination and public health impact of universal interventions to prevent underage drinking and other problem behaviors. This model fits well within a comprehensive strategic framework for promoting effective prevention.