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171.
172.
Fred W. Huffer 《Revue canadienne de statistique》1986,14(4):367-370
We define a partial ordering of distributions which is preserved under convolutions and scale transformations. Some properties of this partial ordering are developed and then used to give a new argument for Slepian's inequality (1962). 相似文献
173.
John Balbus Rebecca Parkin Anna Makri Lisa Ragain Martha Embrey Fred Hauchman 《Risk analysis》2004,24(1):197-208
An interdisciplinary workshop was convened by the George Washington University in June 2001 to discuss how to incorporate new knowledge about susceptibility to microbial pathogens into risk assessment and management strategies. Experts from government, academic, and private sector organizations discussed definitions, methods, data needs, and issues related to susceptibility in microbial risk assessment. The participants agreed that modeling approaches need to account for the highly specific nature of host-pathogen relationships, and the wide variability of infectivity, immunity, disease transmission, and outcome rates within microbial species and strains. Concerns were raised about distinguishing between exposure and dose more clearly, interpreting experimental and outbreak data correctly, and using thresholds and possibly linearity at low doses. Recommendations were made to advance microbial risk assessment by defining specific terms and concepts more precisely, designing explicit conceptual frameworks to guide development of more complex models and data collection, addressing susceptibility in all steps of the model, measuring components of immunity to characterize susceptibility, reexamining underlying assumptions, applying default methods appropriately, obtaining more mechanistic data to improve default methods, and developing more biologically relevant and continuous risk estimators. The interrelated impacts of selecting specific subpopulations and health outcomes, and of increasing model complexity and data demands, were considered in the contexts of public policy goals and resources required. The participants stated that zero risk is unattainable, so targeted and effective risk reduction and communication strategies are essential not only to raise pubic awareness about water quality but also to protect the most susceptible members of the population. 相似文献
174.
In this article we provide a rationale for using alternative, aesthetic methods of qualitative representation (e.g., creative writing, art, music, performance, poetry) in qualitative family therapy research. We also provide illustrative examples of methods that bring findings to life, and involve the audience in reflecting on their meaning. One problem with such forms of data representation has been that, until recently, there have not been standards with which to evaluate them. We summarize evolving standards and explain when the forms are appropriate and when they are not. We also address issues of legitimacy and conflicting standards held by others. 相似文献
175.
Freisthler B Gruenewald PJ Johnson FW Treno AJ Lascala EA 《Journal of drug education》2005,35(1):15-27
This study examines the spatial relationship between drug availability and rates of drug use in neighborhood areas. Responses from 16,083 individuals were analyzed at the zip code level (n = 158) and analyses were conducted separately for youth and adults using spatial regression techniques. The dependent variable is the percentage of respondents using drugs in the past year. Neighborhood drug availability (the major independent variable) was measured by the percentage of non-drug users who had been approached to purchase drugs. Data were obtained as part of the Fighting Back community evaluation. For youth (aged 12 to 18), drug sales in adjacent and surrounding areas were positively associated with self-reported drug use in areas where youth were residents. For adults, drug sales within the neighborhood were negatively associated with drug use, while drug sales in immediately adjacent neighborhoods were positively related to self-reports of drug use. Findings suggest that the areas where rates of drug users are greatest are not necessarily the same area where drugs are sold. Designing strategies to reduce the supply of drugs should receive input from city and regional planners and developers, as well as law enforcement and public health professionals. 相似文献
176.
The topic of global social work has become a controversial one in the European Journal of Social Work, as the March 2004 edition acknowledges in an editorial statement. This statement was prompted by a pungent critique from Stephen Webb, in an earlier edition of the journal. Webb (2003), p. 191) dismissed the topic as being of marginal interest: ‘?… social work has at best a minimal role to play with any global social order, should such an order exist’, adding that ‘a global or transnational social work is little more than a vanity’. Lest the reader should still harbour doubts, Webb (2003), p. 196) added with powerful political import: ‘these writers on globalisation and social work posit what is tantamount to ethical welfare imperialism’. Strong words! We beg to differ and offer an alternative vision of the relationship between globalisation and social work that connects it to the vital democratic force of civil society. 相似文献
177.
Much has been written since the first appearance of HIV/AIDS in 1981 about its effects on the Canadian health care and social services systems. However, researchers have given limited attention to issues of entry or re-entry to the competitive job market for HIV positive individuals. The emergence of highly active antiretroviral therapies (HAART) has allowed a significant number of persons who are HIV positive to experience a major recovery in health and energy. This increase in physical health has in turn led to a re-examination of the possibility of returning to former types and levels of activity, including the prospect of going back to work or entering the competitive workforce for the first time. The purpose of this paper is to outline some of the issues and concerns that impact HIV positive individuals' attempts to return to or enter the competitive workforce, particularly those relating to disability policies and public insurance. Data from in-depth interviews with a sample of people living with HIV/AIDS (PHAs) are used to help illustrate the disconnect between these policies and the lived experiences of PHAs. Also discussed are the opportunities for Canadian policies and practices to employ a functional definition of disability and a philosophy of early intervention in vocational rehabilitation. 相似文献
178.
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180.
Fred F Beck 《Omega》1973,1(6):777-779
It is hypothesized that contract historical cost data can be used to provide a guide for evaluating proposal estimates generated by the organization. This hypothesis was tested for various input factors by examining multiple regressions of specific characteristics of fifty-five contracts. Of the various input factors examined, the multiple regression model explained from a high of over 94 per cent of the variation for engineering labor, to a low of 37 per cent of the variation for electronic development technical labor. The explanatory variables were highly significant with t values ranging from a low of 1·2 to a high of 26·6, with the vast majority greater than 2·0. 相似文献