首日停牌机制下我国IPO抑价影响因子研究

我国的IPO抑价率远超世界平均水平,造成资本的聚集严重制约了资本市场的有效运行。2014年1月,我国资本市场重启IPO,引入新股上市首日临时停牌机制,这一举措是否可以改善抑价水平及其影响因子？通过使用破板日中价来描述首日停盘机制下抑价水平进行实证分析,发现在这一机制的引导下,发行因素代表的不理性因素对IPO抑价水平影响有所下降,说明我国资本市场的信息水平得到提高,市场对新股的投资变得更为理性。     

Challenges in recruiting parents to participate in child welfare research: implications for study design and research practice

Although research with hard‐to‐reach populations is necessary to deepen the social work knowledge base and improve services to these groups, recruiting members of hard‐to‐reach populations for research projects is often a challenging process. Frequently, non‐probability sampling is used to obtain participants. However, the difficulties and limitations associated with this process in quantitative research are rarely discussed in depth in the literature. Sampling issues can significantly impact a research project, delaying it, extending it or even causing the premature termination of a project. Challenges to recruitment can limit the type of research that is completed, impact the knowledge base or introduce threats to validity through sampling bias. Using a preliminary quantitative study on parental engagement with child protective services as an illustration for the discussion, the challenges of non‐probability sampling with a hard‐to‐reach population and the implications for research practice are explored and discussed. Implications for future research practice are considered.     

Reporting Rape in a National Sample of College Women

Abstract

Background: Studies indicate that a small percentage of rapes are reported to law enforcement officials. Research also suggests that rapes perpetrated by a stranger are more likely to be reported and that rapes involving drugs and/or alcohol are less likely to be reported. College women represent a unique and understudied population with regard to reporting rape. Methods: In the current study, the authors interviewed a national sample of 2,000 college women about rape experiences in 2006. Results: Only 11.5% of college women in the sample reported their most recent/only rape experience to authorities, with only 2.7% of rapes involving drugs and/or alcohol reported. Minority status (ie, nonwhite race) was associated with lower likelihood of reporting, whereas sustaining injuries during the rape was associated with increased likelihood of reporting. Discussion: Reporting, particularly for rapes involving drugs and alcohol, is low among college women. Implications for policy are discussed.     

Elder Abuse and Neglect in African American Families: Informing Practice Based on Ecological and Cultural Frameworks

Despite the rapid growth of the elderly African American population in the U.S., elder abuse and neglect in African American families continue to be underdeveloped areas of study. This article presents an ecological and culturally informed framework for the study of elder abuse in African American populations. The model was developed based on Bronfenbrenner's Human Ecological Theory. The model identifies risk factors associated with different systems that have an influence on the lives of African American families. Cultural protective factors also are identified in the model. The model is intended to provide an understanding of elder abuse and neglect in African American families by considering the influence of contextual factors such as the legacy of slavery, social exclusion, and structural segregation and racism. Specific suggestions for practice are proposed according to cultural strengths of African American communities as well as the ecological premises of the model.     

教育变迁视野下人口较少民族文化传承路径及其困境——以云南布朗族为例

全球化浪潮使得布朗族如其他绝大多数少数民族一样正面临外来文化冲击,如何有效传承本民族传统文化日益重要。本研究认为,教育是人类文化传承的重要途径;随着社会的发展,布朗族传统教育的模式及其功能发生了改变;民族地区现代学校教育责无旁贷地成为当今民族文化传承的重要场所,尽管它正面临传承与发展的两难困境。     

Lesbian and Gay Elders and Long-Term Care: Identifying the Unique Psychosocial Perspectives and Challenges

This qualitative study of lesbian and gay elders seeks to identify the psychosocial challenges this community faces regarding long-term care. Two focus groups were conducted among 16 gay elders in community and long-term care settings. Participants reported fear of being rejected or neglected by healthcare providers, particularly personal care aides; fear of not being accepted and respected by other residents; fear of having to go back into the closet if placed in long-term care; and a preference for gay-friendly care. Participants suggested staff training to promote acceptance and respect for gay people, and favorably perceived gay-specific and gay-friendly living arrangements.     

Exploring the Nature of Same-Sex Relationships

This study explored the relationship structure and experiences of 145 people in the United States, aged 50 and above, in long-term, same-sex relationships. A survey assessed relationship satisfaction and roles, caregiving, shared assets, and relationship protection and support. The ENRICH couple scales revealed high scores in communication, conflict resolution, and couple satisfaction. Most participants had taken steps to protect shared assets and assign legal authority to their partners. Participants expressed differing views regarding marriage. This study reveals distinctions based on gender and age that will inform practice with this population.     

Dynamics of age- and size-structured populations in fluctuating environments: Applications of stochastic matrix models to natural populations

Recent developments of the theory of stochastic matrix modeling have made it possible to estimate general properties of age- and size-structured populations in fluctuating environments. However, applications of the theory to natural populations are still few. The empirical studies which have used stochastic matrix models are reviewed here to examine whether predictions made by the theory can be generally found in wild populations. The organisms studied include terrestrial grasses and herbs, a seaweed, a fish, a reptile, a deer and some marine invertebrates. In all the studies, the stochastic population growth rate (ln λ _s ) was no greater than the deterministic population growth rate determined using average vital rates, suggesting that the model based only on average vital rates may overestimate growth rates of populations in fluctuating environments. Factors affecting ln λ _s include the magnitude of variation in vital rates, probability distribution of random environments, fluctuation in different types of vital rates, covariances between vital rates, and autocorrelation between successive environments. However, comprehensive rules were hardly found through the comparisons of the empirical studies. Based on shortcomings of previous studies, I address some important subjects which should be examined in future studies.     

吴之振诗学思想再议

吴之振是清初较有影响的诗人。其诗学思想,学界多以学宋概之。文章则以为其诗学思想应是以宗宋为主,转益多师。     

中国人口老龄化对报纸消费市场的影响——基于老龄化程度与报纸发行量关系的实证分析

随着信息技术及新媒体的发展,报业市场面临严峻考验,阅报人口逐渐出现老龄化倾向。运用计量经济学方法,在分析老龄化程度与报纸发行量关系的基础上,进一步分析中国老龄化对报纸消费市场的影响。结果表明,老龄化程度与报纸发行量高度正相关,老龄化对报纸的发行量、消费结构、报纸读者消费行为产生影响。老龄化既促进了中国报业"量"的发展,又在一定程度上阻碍了中国报业"质"的提高。最后,提出了相应的对策建议。