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41.
Pavlov and the prisoner's dilemma   总被引:2,自引:0,他引:2  
Our Pavlov learns by conditioned response, through rewards and punishments, to cooperate or defect. We analyze the behavior of an extended play Prisoner's Dilemma with Pavlov against various opponents and compute the time and cost to train Pavlov to cooperate. Among our results is that Pavlov and his clone would learn to cooperate more rapidly than if Pavlov played against the Tit for Tat strategy. This fact has implications for the evolution of cooperation.  相似文献   
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ABSTRACT

This study explores school, family, and community partnership at the high school level, using eight family centers as the entry point for the investigation. The purpose of the study was to identify ways that parents and school staff could collaborate to support high school students' achievement. The study findings led to the development of a model that represents three inputs that are crucial to the creation of a successful family center: (1) a supportive infrastructure, (2) the existence of skilled center staff, and (3) the presence of responsive programming. These three inputs led to the creation of a thriving center that acts as a transformative space, a “zone of community,” that results in four outputs: (1) the creation of relational trust among adults, (2) shift in parents' role construction and efficacy, (3) the generation of student relational trust, and (4) the development of student efficacy. The data from this study suggest that the relational trust developed in these transformative spaces called family centers can have a positive effect on student efficacy. The study concludes with seven recommendations for schools and districts looking to establish family centers in high schools as a way to expand family engagement at the high school level.  相似文献   
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Grounded theory (GT) has been a popularly used qualitative research methodology in the social sciences and has become increasingly popular for doctoral theses and dissertations. Yet, issues such as the changing nature of grounded theory, time constraints, theses advisors, doctoral committee procedures and Institutional Review Board regulations create challenges for doctoral candidates (researchers) who choose to use GT for their dissertations. In this paper, we present the general and specific challenges of using GT for doctoral theses and dissertations by sharing our personal experiences from our Ph.D. programmes in the USA. We conclude by providing practical suggestions for doctoral researchers who are considering using GT for their theses and dissertations.  相似文献   
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The incidence of annexation, the growth in the original area and in the area annexed, and the proportion of growth due to annexation between 1950 and 1970 are analyzed for U.S. cities grouped by size, metropolitan status, and region of the country. Over this period, annexation was a principal means of population growth for incorporated places outside the Northeast. Though often associated with metropolitan growth, annexation was even more important in the growth of nonmetropolitan cities. Overall growth differences by size of place, metropolitan status, and decade (1950--1960 or 1960--1970) could not be explained by the incidence and nature of annexation.  相似文献   
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Online deviant behaviors have been prevalent since the Internet became ubiquitous, but research in this field is relatively scarce. The present study investigates a unique deviant behavior in online video gaming communities – game cheating – to further understand the scope of online deviant social behaviors. This paper aims to uncover how game players actively create and negotiate new meanings of game cheating in online games. Six focus groups were conducted to explore the rationalization process for engaging in game cheating among players of different online video games. It was discovered that elements of intentionality, utility, core gaming goals, evolving gaming norm, and social ties to gaming communities serve as important rationalizing process to justify game cheating behaviors. Through the discovery of these mental schemas for online game cheating, the paper discusses how online deviant behaviors are connected with social life online and form a unique online culture.  相似文献   
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Although cartoons are widely used in health communication, their effectiveness has seldom been tested. In this study, the effects of four humor–threat antismoking cartoon posters are evaluated in a sample of 12- to 15-year-olds (n = 183) in Hong Kong. The five-group comparison (including the control group) revealed that these posters did not increase antismoking attitudes in the sample but did decrease antismoking behavioral intentions. The better liked, more humorous, and more frightening posters did not produce increased antismoking attitudes or behavioral intentions. These findings warrant the development of theories to clarify the role of humor in health communication. Although cartoons are well liked by adolescents, practitioners must be aware of the possible negative effects of humor in cartoon-based messages.  相似文献   
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