首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   62850篇
  免费   1266篇
  国内免费   7篇
  64123篇
  2020年   594篇
  2019年   655篇
  2018年   842篇
  2017年   902篇
  2016年   999篇
  2015年   782篇
  2014年   885篇
  2013年   4291篇
  2012年   1657篇
  2011年   1658篇
  2010年   1080篇
  2009年   1031篇
  2008年   1509篇
  2007年   1444篇
  2006年   1267篇
  2005年   1222篇
  2004年   1153篇
  2003年   1105篇
  2002年   1120篇
  2001年   1825篇
  2000年   1772篇
  1999年   1286篇
  1998年   624篇
  1992年   1250篇
  1991年   1183篇
  1990年   1192篇
  1989年   1095篇
  1988年   1052篇
  1987年   1024篇
  1986年   1079篇
  1985年   1185篇
  1984年   949篇
  1983年   868篇
  1982年   616篇
  1981年   647篇
  1980年   566篇
  1979年   1061篇
  1978年   711篇
  1977年   667篇
  1976年   662篇
  1975年   933篇
  1974年   1064篇
  1973年   1109篇
  1972年   966篇
  1971年   914篇
  1970年   896篇
  1969年   882篇
  1968年   1145篇
  1967年   1051篇
  1966年   956篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
931.
The available literature indicates that: (a) experiences of childhood violence are associated with mediator variables, including antisocial behaviors and depressive symptomatology, that are themselves associated with development of alcohol problems and perpetration of partner violence for men in adulthood; (b) experiences of childhood violence and, more strongly, observation of interparental violence during childhood predict perpetration of partner violence in adulthood for males; (c) presence of partner violence is associated with certain types of alcohol problems for men; and (d) both partner violence and alcohol problems are associated with marital conflict. However, available research has often excluded important moderator variables, such as history of familial and parental alcohol problems and history of parental psychiatric disorders. Based on the available research, two indirect pathways between childhood violence and adulthood problems (i.e., alcohol problems and partner violence) are proposed as guides for future research in the areas of family violence and alcohol problems for men. Further, bidirectional associations between alcohol problems and partner violence are proposed. Finally, inclusion of important moderator and mediator variables in multivariate research designs is suggested.  相似文献   
932.
The Christian conviction about Divine Providence encourages a novel account of the moral content of health and authority in the health care context. While health can be understood as the disposition of a living body to be able to proceed in the world well, as a species of freedom it is informed by the particular projects and concerns that Christians hold deepest. This is due to the fact that health acquires content, and thus becomes desirable as a particular type of good, only in relation to judgments about the good life. Aquinas' reflections concerning the good of health and its partial slavery to fortune reveal a Christian past that dwelt on the intrinsic and instrumental good of health. A rich Christian tradition in which health as intrinsically good, a good of the body, is ordained to the interests of right Christian virtue. Each of these factors affects the character of the health to be pursued and the authority of the physician as determining the ends and means of medicine.  相似文献   
933.
934.
The feminist ethic of care has often been criticized for its inability to address four problems--the problem of exploitation as it threatens care givers, the problem of sustaining care-giver integrity, the dangers of conceiving the mother-child dyad normatively as a paradigm for human relationships, and the problem of security social justice on a broad scale among relative strangers. We argue that there are resources within the ethic of care for addressing each of these problems, and we sketch strategies for developing the ethic more fully.  相似文献   
935.
Feminist legal theory provides a healthy skepticism toward legal doctrine and insists that we reexamine even formally gender-neutral rules to uncover problematic assumptions behind them. The article first outlines feminist legal theory from the perspectives of liberal, cultural, and radical feminism. Examples of how each theory influences legal practice, case law, and legislation are highlighted. Each perspective is then applied to a contemporary bioethical issue, egg donation. Following a brief discussion of the common themes shared by feminist jurisprudence, the article incorporates a narrative reflecting on the integration of the common feminist themes in the context of the passage of the Maryland Health Care Decisions Act. The article concludes that gender does matter and that an understanding of feminist legal theory and practice will enrich the analysis of contemporary bioethical issues.  相似文献   
936.
The World-Wide Web provides an inviting opportunity to reach large numbers of people, both as an audience for psychoacoustical discussions and demonstrations and as subjects for psychoacoustical experiments. Such use of the Web poses a unique set of challenges. We present the methodologies used to prepare a multimedia primer in auditory perception at McGill University. As well as instructional material, this primer includes acoustical experiments conducted over the Web. We discuss the response and experiences with this site in general and in a particular class situation at Hanover College.  相似文献   
937.
This article reports of the activities of the working group, Ethics & Engineers, of the Royal Flemish Society of Engineers. More particularly, the ethical problems that engineers face in the preparation of an environmental report are illuminated. Irrespective to which party the engineer belongs, he or she is confronted with the difficult weighting of his or her personal interest, the interests of private companies and last but not least the common good. It is argued that the implementation of a code of ethics and the introduction of courses on engineering ethics into the education of engineers would strengthen the engineer in the fulfilment of his vocation. Dirk Holemans is a bio-engineer preparing a doctoral thesis on the social responsibility of engineers, Herman Lodewyckx teaches ethics and has research interests in professional and applied ethics.  相似文献   
938.
Exposure to numerical examples (seed facts) produced a substantial long-term reduction in domain-specific innumeracy. In particular, learning the populations of 24 seed countries improved accuracy of estimates of the populations of 75 untrained countries, both at the time of learning and 4 months later. Consistent with abstraction-based theories of learning and memory, the benefits of having been exposed to the seed facts were as large 4 months after the exposure as immediately after it, despite the specific populations of the seed countries having been forgotten during the interval.  相似文献   
939.
This paper makes the assumption that organ transplantation is, under some conditions at least, a proper use of communal medical resources. Proceeding from this assumption, the author: (1) sketches the history of the problem; (2) briefly examines the prevalent models of communal structure and offers an alternate version; (3) discusses notions of justice and obligation derived from these different models; (4) applies these to the practice of harvesting organs for transplantation; and then (5) offers a different process for harvesting organs from the newly dead. If community is viewed as united by a set of shred goals and common values among which the value of community itself is important, then certain reciprocal obligations among members obtain. I suggest that routine salvage of organs from the newly dead be instituted but that it be routine salvage “with a twist”: rather early in life all members of the community are given the opportunity to refuse but their refusal carries the reciprocal condition that they cannot later become the recipients of that which they refuse to others.  相似文献   
940.
An aftereffect of perceived texture density contingent on the color of a surrounding region is reported. In a series of experiments, participants were adapted, with fixation, to stimuli in which the relative density of two achromatic texture regions was perfectly correlated with the color presented in a surrounding region. Following adaptation, the perceived relative density of the two regions was contingent on the color of the surrounding region or of the texture elements themselves. For example, if high density on the left was correlated with a blue surround during adaptation (and high density on the right with a yellow surround), then in order for the left and right textures to appear equal in the assessment phase, denser texture was required on the left in the presence of a blue surround (and denser texture on the right in the context of a yellow surround). Contingent aftereffects were found (1) with black-and-white scatter-dot textures, (2) with luminance-balanced textures, and (3) when the texture elements, rather than the surrounds, were colored during assessment. Effect size was decreased when the elements themselves were colored, but also when spatial subportions of the surround were used for the presentation of color. The effect may be mediated by retinal color spreading (Pöppel, 1986) and appears consistent with a local associative account of contingent aftereffects, such as Barlow’s (1990) model of modifiable inhibition.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号