全文获取类型
收费全文 | 12324篇 |
免费 | 217篇 |
专业分类
管理学 | 1525篇 |
民族学 | 57篇 |
人口学 | 1009篇 |
丛书文集 | 71篇 |
教育普及 | 3篇 |
理论方法论 | 1104篇 |
综合类 | 121篇 |
社会学 | 6554篇 |
统计学 | 2097篇 |
出版年
2023年 | 63篇 |
2021年 | 68篇 |
2020年 | 166篇 |
2019年 | 249篇 |
2018年 | 264篇 |
2017年 | 379篇 |
2016年 | 266篇 |
2015年 | 209篇 |
2014年 | 287篇 |
2013年 | 2503篇 |
2012年 | 338篇 |
2011年 | 336篇 |
2010年 | 234篇 |
2009年 | 226篇 |
2008年 | 253篇 |
2007年 | 242篇 |
2006年 | 262篇 |
2005年 | 245篇 |
2004年 | 207篇 |
2003年 | 178篇 |
2002年 | 201篇 |
2001年 | 291篇 |
2000年 | 271篇 |
1999年 | 276篇 |
1998年 | 179篇 |
1997年 | 160篇 |
1996年 | 219篇 |
1995年 | 218篇 |
1994年 | 221篇 |
1993年 | 224篇 |
1992年 | 236篇 |
1991年 | 225篇 |
1990年 | 244篇 |
1989年 | 217篇 |
1988年 | 203篇 |
1987年 | 183篇 |
1986年 | 167篇 |
1985年 | 175篇 |
1984年 | 186篇 |
1983年 | 131篇 |
1982年 | 129篇 |
1981年 | 106篇 |
1980年 | 121篇 |
1979年 | 116篇 |
1978年 | 103篇 |
1977年 | 94篇 |
1976年 | 88篇 |
1975年 | 88篇 |
1974年 | 62篇 |
1973年 | 56篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
951.
952.
953.
954.
955.
956.
957.
The technological approach to risk regulation seeks to lessen the incidence of mortality and morbidity by modifying environmental conditions. Insofar as risk-taking behavior is purposive, social scientists have predicted that technological progress may be negated by various forms of risk compensation. The validity of this hypothesis is tested in the transportation sector with data from the U.S. on the effects of new mandatory safety-belt-use laws. A fixed-effects model of traffic fatality counts is estimated using pooled data from 50 states during the 1975–1987 period. Results suggest that such laws have reduced mortality among car occupants to a degree that is compatible with the predictions of technologists. However, there is weak evidence of increased mortality among some nonoccupants, a pattern predicted by risk-compensation theorists. The lifesaving effects of belt-use laws are largest in states that permit primary police enforcement and appear to be somewhat larger for front-seat occupants age 21 and under. Although offsetting behavior appears to be small relative to lifesaving effects, it may take several more years for any compensatory behavior to achieve a new equilibrium.This research was supported in part by a grant from the Centers for Disease Control to the New England Injury Prevention Research Center. 相似文献
958.
An attributional analysis of neonatal euthanasia was undertaken in two studies to compare the responsibility attributions of nursing and non-nursing students (Study 1) and nurses (Study 2) toward a physician for a critically ill neonate's death. In both studies, vignettes about a newborn's death differed with respect to the physician's treatment of the critically ill newborn. In the student study, the physician was attributed the least responsibility for the newborn's death when cardiopulmonary resuscitation was attempted but failed, followed by the physician's issuance of either a "Do Not Resuscitate" order or an order to turn off the infant's respirator. Greatest responsibility was attributed to the physician when he ordered the infant's nutritional and hydration support to be terminated. In addition, the student's major (nursing vs. non-nursing) and the nursing student's educational cohort impacted the level of physician responsibility attributed. In contrast, the nurses' study found that the termination of nutritional and hydrational support was viewed as different from the physician's other three actions. 相似文献
959.
Since the early 1970s the issue of euthanasia has been intensely debated in The Netherlands. Through these debates knowledge about medical practices involving the end of life was no longer confined to medical or legal quarters, but became public to a large extent. Following public opinion changes, the legal reaction to euthanasia changed. By prosecuting test cases the public prosecutors allowed the Dutch Supreme Court to formulate specific conditions in which euthanasia would go unpunished. The political debate about changing the criminal law, which still holds that euthanasia is a serious crime, developed at a much slower pace. Several extensive empirical studies were undertaken to gain valid knowledge about the medical practices. This article is concerned with a presentation of the various debates and the changes that took place in the fields of criminal law, politics, and medicine. The main conclusion is the hypothesis that a more open climate for medical practices concerning the end of life allows society to better control these practices. 相似文献
960.