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In the absence of data from multiple-compound exposure experiments, the health risk from exposure to a mixture of chemical carcinogens is generally based on the results of the individual single-compound experiments. A procedure to obtain an upper confidence limit on the total risk is proposed under the assumption that total risk for the mixture is additive. It is shown that the current practice of simply summing the individual upper-confidence-limit risk estimates as the upper-confidence-limit estimate on the total excess risk of the mixture may overestimate the true upper bound. In general, if the individual upper-confidence-limit risk estimates are on the same order of magnitude, the proposed method gives a smaller upper-confidence-limit risk estimate than the estimate based on summing the individual upper-confidence-limit estimates; the difference increases as the number of carcinogenic components increases. 相似文献
113.
A Comparison of Web and Mail Survey Response Rates 总被引:19,自引:0,他引:19
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Transnational households and ritual: an overview 总被引:1,自引:0,他引:1
In this article we introduce five papers, all by social anthropologists, all concerned with transnational households and ritual. Despite wide–ranging research on transnational migration and diasporas, many aspects have been accorded less consideration than they deserve. The transnational practices of migrant families, other than remittances and other economic activity, remain under–investigated. Some thought has been given to the transnational dimension of religious belief systems, notably Islam, but the micro–politics of religion has been largely ignored, and there has been little discussion of transnational religious practices (rituals) at the level of households and families, especially those performed by migrants back in their countries of origin. Household–level analyses of the performances of and meanings attributed to life–crisis rituals and consideration of what Salih has called the ‘transnational division of ritual space’ offer a valuable route to understanding relations between place, culture, ethnicity and gender among migrants in a transnational world, and illuminate contemporary processes of globalization. 相似文献
116.
Ralph B. Taylor 《Population and environment》1980,3(3-4):298-308
A recent and noteworthy facet of crowding research has been the exploration of the perception of high density/crowding experiences. A review of the methods and results of these investigations reveals considerable variation across studies on the dimensions of stimulus domain and selection, attention to intersubject differences, and approaches to interpreting results. The outputs of these studies do not appear as clearcut as has been suggested. It is hoped that the raising of these issues will result in more careful and fruitful research in this area. The links between conceptual crowding, situational variables, intrapersonal variables, and behavioral responses to high density/crowding are discussed. 相似文献
117.
Ralph K. White 《The Journal of social issues》1988,44(2):191-202
An approach to peace is called "positive" here if, in addition to appearing as a realistic means toward peace, it is inherently attractive and morally unobjectionable. Positive approaches include drastic reduction of nuclear weapons (bilateral if possible, but unilateral if necessary), total elimination of first-strike nuclear weapons, a wholehearted no-first-use policy in actions as well as in words, humanization of our own diabolical image of the U.S.S.R., cultivation of realistic empathy and global consciousness, drastic reduction of fear appeals by the peace movement, and cultivation of realistic hope. However, some "negative" actions are also well worth considering as paths to peace: retention of approximately 5% of our present nuclear strength, retention of "adequate" conventional strength, realistic criticism of the U.S.S.R., occasional use of fear appeals, and guarding against unrealistic hope. As a model of positive reasoning and a source of useful references, an imaginary dialogue is presented in which a peace activist answers, in a factual and two-sided way, a number of highly skeptical hawkish questions. Learning to answer such questions effectively may add to both immediate effectiveness and long-term hope within the peace movement. 相似文献
118.
Ralph Firth 《Social Work Education》2013,32(8):903-911
In a period when recruitment and retention are crucial issues in health and social care the focus of this paper is: ? Who are the workforce of health and social care? ? What are the needs of that workforce? ? How safe is it for the much smaller partner, social care, to work together with the much larger health care? The latter point heads us back to the sub‐title of the paper: can a duck sleep with a hippopotamus? This question comes from an advert used in the UK for a bed manufacturer, where our British sensitivities and fear of sex prevents us from showing a man and a woman in a double bed, what the Spanish charmingly call a ‘cama de matrimonio’, a marriage bed, and instead we show a hippopotamus and a duck sleeping, safely, in the same bed. To follow this analogy, we have to show: ? that health and social care are in the same bed; ? that one is as large as a hippopotamus, and the other as small as a duck; ? what the dangers are of this; and ask the question: ? What is there in the place of ‘spring technology’ which would permit both to sleep together, and for the duck not to end up flat? In doing so, I hope to answer the first three questions I posed. 相似文献
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