全文获取类型
收费全文 | 26511篇 |
免费 | 1128篇 |
国内免费 | 18篇 |
出版年
2020年 | 316篇 |
2019年 | 326篇 |
2018年 | 472篇 |
2017年 | 481篇 |
2016年 | 515篇 |
2015年 | 519篇 |
2014年 | 572篇 |
2013年 | 2519篇 |
2012年 | 891篇 |
2011年 | 963篇 |
2010年 | 685篇 |
2009年 | 688篇 |
2008年 | 780篇 |
2007年 | 737篇 |
2006年 | 638篇 |
2005年 | 544篇 |
2004年 | 556篇 |
2003年 | 518篇 |
2002年 | 522篇 |
2001年 | 800篇 |
2000年 | 786篇 |
1999年 | 555篇 |
1998年 | 295篇 |
1997年 | 298篇 |
1996年 | 263篇 |
1995年 | 261篇 |
1993年 | 294篇 |
1992年 | 493篇 |
1991年 | 451篇 |
1990年 | 462篇 |
1989年 | 468篇 |
1988年 | 449篇 |
1987年 | 409篇 |
1986年 | 416篇 |
1985年 | 399篇 |
1984年 | 369篇 |
1983年 | 323篇 |
1982年 | 273篇 |
1981年 | 263篇 |
1980年 | 246篇 |
1979年 | 329篇 |
1978年 | 315篇 |
1977年 | 285篇 |
1976年 | 276篇 |
1975年 | 357篇 |
1974年 | 381篇 |
1973年 | 286篇 |
1972年 | 272篇 |
1969年 | 247篇 |
1968年 | 256篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
231.
The Sentencing Reform Act of 1984, which created the U.S. Sentencing Commission, required that the commisson consider prison capacity in drafting sentencing guidelines. As part of the commission's efforts to meet this requirement, we developed a computer simulation capable of projecting the impact of the commission's guidelines on future sentences and prison populations. According to our projections, “straight” probation sentences will be reduced significantly under the guidelines. However, reducing the use of probation will generate only modest demands on the prisons, and then mostly for community corrections phased in over the course of 5 years. We also project that, while average time served for violent offenses will increase substantially, average time served for most property crimes will remain largely the same. Finally, while we forecast that federal prison populations will grow markedly by the end of this century, this is more a result of the Anti-Drug Abuse Act of 1986 and the career offender provision of the Comprehensive Crime Control Act of 1984 than a result of the guidelines. 相似文献
232.
J M Stern S K Johnson 《Journal of comparative psychology (Washington, D.C. : 1983)》1989,103(3):269-280
Prior to assuming the upright crouching posture over their pups during nursing bouts, lactating rats typically engage in several oral behaviors, including nuzzling, licking and rearranging pups. By acutely depriving dams of various aspects of perioral stimulation from pups (with anesthesia of the mystacial pads or of the tongue, with mouth suturing, or with muzzling), we found the following: (1) Distal stimulation from pups maintains proximity-seeking behavior, but is insufficient to stimulate nursing behavior. (2) Lack of tongue feedback decreases pup licking and hastens the onset of crouching. (3) Snout, but not tongue, contact with pups is required for hovering over them. (4) The position of the dam while hovering over her litter enables the pups to gain access to her ventrum, thereby provoking her upright, crouching posture. (5) Older pups are capable of bypassing the dam's perioral attentions and stimulating crouching directly by burrowing under the dam's ventrum. 相似文献
233.
234.
Relationship of racial stressors to blood pressure responses and anger expression in black college students 总被引:5,自引:0,他引:5
The physiological effects of racism, as a stressor, were examined as they related to blood pressure (BP) and anger experiences in Black college students. Current research has failed to consider the stressful effects of racism as a factor contributing to the higher incidence of essential hypertension among Blacks. Twenty-seven Black college students viewed three excerpts showing racist situations involving Blacks; anger-provoking, nonracist situations; and neutral situations. After each scene, BP was taken, and a mood checklist was administered. The Framingham Anger Scale and the Anger Expression Scale were administered. Analyses revealed that BP significantly increased during the presentation of racist stimuli but not of anger-provoking or neutral stimuli. Self-reports of state anger, as measured by the mood checklist, were significant for both the anger-provoking and racist stimuli. BP scores were significantly correlated to the two trait anger measures. Exposure to racist stimuli was associated with BP increases among Blacks. Such cumulative exposure to racism may have important implications for the etiology of essential hypertension. 相似文献
235.
Leanne K. Lamke 《Sex roles》1989,21(9-10):579-590
This study examined the relationship between marital adjustment and husbands' and wives' instrumentalness and expressiveness. Eighty-five rural couples completed the Spanier Dyadic Adjustment Scale and the Personal Attributes Questionnaire. Multiple regression analyses indicated that husbands' expressiveness was the sole predictor of both husbands' and wives' marital adjustment. Results are compared to previous research findings with urban couples. Implications of the findings for gender-related patterns of socialization are also discussed. 相似文献
236.
Sharyn S. Belk William E. Snell Jr. Wayne H. Holtzman Jr. Julita Elemi Hernandez-Sanchez Renan Garcia-Falconi 《Sex roles》1989,21(9-10):671-695
People vary in the extent to which they hold stereotypic beliefs about women. The recently developed Beliefs About Women Scale (BAWS) was used in five investigations to examine the following aspects of people's stereotypic beliefs about women: (Study I) the impact of ethnicity (Hispanics and Anglos) on women's endorsement of traditional beliefs about women; (Study II) the impact of national culture (Mexico and the United States) on women's responses to the BAWS; (Study III) the extent to which U.S. women define women's and men's mental health in terms of stereotypic beliefs about women; (Study IV) the extent to which preferences for counseling orientation influence the beliefs about women attributed to mentally healthy women and men; and (Study V) the impact of national culture (Mexico and the United States) on the beliefs about women ascribed to mentally healthy women and men. The results indicated that (a) U.S. Anglo females disagreed more strongly with traditional beliefs about women than did U.S. Hispanic females; (b) U.S. women expressed greater agreement with traditional stereotypes about women's interpersonal abilities and greater disagreement with traditional stereotypes about women's personal competencies than did women from Mexico; (c) the beliefs about women held by U.S. psychology trainees, and the beliefs about women that they attributed to mentally healthy females, were more nontraditional than those that they attributed to mentally healthy males; (d) particular counseling preferences were associated with the stereotypic beliefs about women that female counseling trainees imputed to mentally healthy males and females; and (e) similarities and differences exist on the beliefs about women that female psychology trainees from the United States and Mexico ascribe to mentally healthy females and males. The discussion focuses on mentally healthy beliefs about women, and the implications of these findings for the delivery of mental health services to women and men from various cultures. 相似文献
237.
238.
This study examined the ability of both an overt integrity test and a personality-based measure of delinquency to predict on-the-job theft and counterproductivity. A heterogeneous sample of 105 employees anonymously completed both tests and a criterion checklist that included a 9-item theft subscale and a 12-item counterproductivity subscale. Results indicated that the overt integrity test was a superior predictor of both on-the-job theft and drug abuse compared to the personality-based measure. The overt integrity test was also a slightly better predictor of general counterproductivity. These findings and their implications are discussed. 相似文献
239.
This paper discusses the use of drug screening for employee selection decisions. Common methods of drug screening are described, and a recent study of drug screening accuracy is summarized. It is argued that drug screening is subject to the same standards as are other selection procedures, and that human resource professionals must assume responsibility for understanding the potential problems associated with drug screening. Issues relevant to determining the benefits of drug screening are discussed, and an illustration of the impact of drug screening on decision accuracy is presented. It is suggested that, in many instances, the value of drug screening in the selection process may be low enough to warrant serious concern. Implications for human resource research and practice are noted.An earlier version of this paper was presented at the 95th Annual Convention of the American Psychological Association in New York; August 31, 1987. The authors would like to thank Michael Bramel for his assistance in locating and summarizing some of the medical literature cited, and two anonymous reviewers for their helpful comments. 相似文献
240.