全文获取类型
收费全文 | 69680篇 |
免费 | 1196篇 |
国内免费 | 5篇 |
专业分类
70881篇 |
出版年
2020年 | 869篇 |
2019年 | 1043篇 |
2018年 | 1427篇 |
2017年 | 1429篇 |
2016年 | 1533篇 |
2015年 | 1097篇 |
2014年 | 1355篇 |
2013年 | 6165篇 |
2012年 | 2427篇 |
2011年 | 2453篇 |
2010年 | 1520篇 |
2009年 | 1544篇 |
2008年 | 2136篇 |
2007年 | 2092篇 |
2006年 | 1965篇 |
2005年 | 1682篇 |
2004年 | 1696篇 |
2003年 | 1657篇 |
2002年 | 1566篇 |
2001年 | 2149篇 |
2000年 | 2011篇 |
1999年 | 1542篇 |
1998年 | 802篇 |
1997年 | 724篇 |
1996年 | 763篇 |
1995年 | 701篇 |
1994年 | 683篇 |
1993年 | 660篇 |
1992年 | 1229篇 |
1991年 | 1150篇 |
1990年 | 1108篇 |
1989年 | 1061篇 |
1988年 | 1010篇 |
1987年 | 962篇 |
1986年 | 972篇 |
1985年 | 1045篇 |
1984年 | 878篇 |
1983年 | 754篇 |
1982年 | 595篇 |
1981年 | 588篇 |
1979年 | 841篇 |
1978年 | 664篇 |
1977年 | 569篇 |
1976年 | 563篇 |
1975年 | 696篇 |
1974年 | 779篇 |
1973年 | 782篇 |
1972年 | 659篇 |
1971年 | 607篇 |
1968年 | 637篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
201.
Relationship of severity of dementia to caregiving stressors 总被引:4,自引:0,他引:4
In studies of individual differences and longitudinal changes in stress and coping among dementia caregivers, assessing severity of patient impairment is critically important. It is proposed that with the progression of dementia, cognitive impairment may steadily increase, but other stressful behavioral symptoms peak at various stages of dementia. Cross-sectional data from 49 caregiving families and longitudinal follow-up data from 48 families suggest that instrumental self-care deficits begin early in dementia, and basic self-care deficits increase with dementia severity, but that many distressing behavioral symptoms decrease in late dementia. Assessments of dementia patient severity should be multidimensional, and increases and decreases in various dementia patient stressors over time should be considered as factors influencing caregiver coping. 相似文献
202.
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
203.
This article examines the hindsight bias in the context of mental health malpractice litigation, analyzes various legal mechanisms for dealing with the bias, and discusses whether the law should strive for debiasing in all mental health malpractice cases. 相似文献
204.
M T Phelps W A Roberts 《Journal of comparative psychology (Washington, D.C. : 1983)》1989,103(4):326-338
We studied central-place foraging in rats (Rattus norvegicus) by placing food items that varied in size and weight at the ends of a 4-arm radial maze. In Experiments 1-3, rats increasingly tended to carry food to the center of the maze as the size of those items increased. Very large food items often were hoarded in the center. Rats consumed food faster on the arms than in the center, and rats traveled faster when carrying food than when not. Blocking arm entrances increased travel time between the center and the arms and decreased food carrying at every item weight except the largest. In Experiments 4-6, important conditions that influence the degree of food-carrying behavior were discovered; these were the intersection of maze arms, the presence of a conspecific, and the use of open vs. closed maze arms. 相似文献
205.
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
206.
This paper addresses the use of the weekly written summary with patients in group psychotherapy. In an effort to stimulate group process and effect cotherapist communication, the authors instituted this group recording in an ongoing psychodynamically oriented mixed adult group. While the utilization of this device did, in fact, stimulate the group process and became an important part of the group's life, the therapists additionally saw significant effects upon their working alliance. These included increased focused dialogue upon group dynamics, more purposeful planning for group interventions, and heightened awareness of the significance of interventions in the group.Ms. Bosman-Clark is formerly Clinical Instructor, Department of Psychiatry, Baylor College of Medicine. 相似文献
207.
David A. Washburn William D. Hopkins Duane M. Rumbaugh 《Behavior research methods》1989,21(2):281-284
Researchers interested in studying discrimination learning in primates have typically utilized variations in the Wisconsin General Test Apparatus (WGTA). In the present experiment, a new testing apparatus for the study of primate learning is proposed. In the video-task paradigm, rhesus monkeys (Macaca mulatta) respond to computer-generated stimuli by manipulating a joystick. Using this apparatus, discrimination learning-set data for 2 monkeys were obtained. Performance on Trial 2 exceeded 80% within 200 discrimination learning problems. These data illustrate the utility of the video-task paradigm in comparative research. Additionally, the efficient learning and rich data that were characteristic of this study suggest several advantages of the present testing paradigm over traditional WGTA testing. 相似文献
208.
The sentence verification technique (SVT), developed by Royer, Hastings, and Hook (1979), provides developmental and educational researchers with an alternative way of assessing text comprehension based on all of the information contained in a passage. Students must decide if test sentences have the same meaning as sentences that appeared in an original passage. The program described here automates the more laborious aspects of constructing SVT tests. The user must create a passage using a word processor. The program will prompt the user for information as needed. Finally, printable text files (SVT test and answer key) are generated. The program is written in BASIC for IBM and IBM-compatible computers. 相似文献
209.
Jerry M. Lewis J. M. Rabbie Thomas Berg Michael Argyle Karin Aronsson Roger Ingham Neil Frude A. M. Munton Duncan Cramer John Shotter Ray Holland Nobleza Asuncion-Lande Ray Crozier Candida Peterson Chris Spencer Victor J. Callan Jack Martin N. L. Reinsch Anthony Ryle David Canter Jill Robson H. R. Beech Duncan Moss David Fontana Tom Richards 《Current psychology (New Brunswick, N.J.)》1989,8(1):49-87
210.
Eileen M. Furey 《Behavioral Interventions》1989,4(2):143-154
The literature reports a number of reasons why abuse of people with mental retardation occurs. These causes of abusive behavior can be divided into three categories: organizational variables, staff characteristics, and client characteristics. The author examines each of the variables and presents recommendations for reducing their contributions to abusive behavior. 相似文献