全文获取类型
收费全文 | 42580篇 |
免费 | 1662篇 |
国内免费 | 24篇 |
出版年
2020年 | 486篇 |
2019年 | 638篇 |
2018年 | 863篇 |
2017年 | 884篇 |
2016年 | 913篇 |
2015年 | 651篇 |
2014年 | 779篇 |
2013年 | 3651篇 |
2012年 | 1370篇 |
2011年 | 1460篇 |
2010年 | 1003篇 |
2009年 | 1007篇 |
2008年 | 1399篇 |
2007年 | 1324篇 |
2006年 | 1213篇 |
2005年 | 1038篇 |
2004年 | 1006篇 |
2003年 | 1003篇 |
2002年 | 957篇 |
2001年 | 1359篇 |
2000年 | 1345篇 |
1999年 | 1014篇 |
1998年 | 537篇 |
1997年 | 443篇 |
1996年 | 392篇 |
1995年 | 427篇 |
1994年 | 430篇 |
1993年 | 407篇 |
1992年 | 832篇 |
1991年 | 800篇 |
1990年 | 758篇 |
1989年 | 703篇 |
1988年 | 684篇 |
1987年 | 678篇 |
1986年 | 626篇 |
1985年 | 701篇 |
1984年 | 574篇 |
1983年 | 451篇 |
1982年 | 397篇 |
1981年 | 394篇 |
1979年 | 556篇 |
1978年 | 444篇 |
1977年 | 412篇 |
1976年 | 389篇 |
1975年 | 472篇 |
1974年 | 490篇 |
1973年 | 528篇 |
1972年 | 413篇 |
1968年 | 394篇 |
1966年 | 387篇 |
排序方式: 共有10000条查询结果,搜索用时 250 毫秒
211.
Legal and nonlegal factors influencing the civil commitment recommendations of psychologists and psychiatrists separately and as a whole were investigated using an experimental design. One hundred and seventy-six psychologists and psychiatrists made recommendations for or against commitment for a series of clinical vignettes wherein the five facets of commitment criterion, legal committability, clinical treatability, alternative resources and presence of psychosis were systematically varied. Results revealed that all facets contributed independently and in combination to the commitment decisions of participants as a whole. It was concluded that mental health professionals may utilize a variety of types of information, beyond the relevant legal criteria, in making actual decisions to initiate civil commitments. 相似文献
212.
213.
214.
215.
A computer-controlled system that detects spontaneous activity (locomotion and rearing) and diurnal activity rhythms in small animals is described. Automatic recording of subtotals during test periods provides data about habituation (nonassociative learning). The system is relatively inexpensive to construct. Fabricated from highly reliable circuit components, it provides replicable measures that enable comparisons between different experimental treatments to be made using parametric statistics. 相似文献
216.
Robert S. Burke 《Behavior research methods》1988,20(2):171-174
A technical issue in auditory spatial attention research is how best to provide low-cost, accurate control of the frequency, duration, and location of acoustic signals. Three solutions to the problem are compared: use of the internal oscillator of the Apple lIe, use of a Mountain A/D+D/A card, and use of an external oscillator chip. The unique advantages and drawbacks of each system are discussed. All share some common problems of external speaker interface, timing control, and interface with the software. Hardware and software solutions implemented on the Apple-Psych system are discussed, along with data that demonstrate the precision control achieved with the system. 相似文献
217.
Daniel S. Lordahl 《Behavior research methods》1988,20(2):221-223
Difficulties with the Microsoft BASIC function for generating random numbers (RND) are cited and new problems reported. Fixes are suggested that allow use of some of the speed of the original function and that produce greatly improved pseudorandom numbers. A published generator is combined with the RND function as a compromise solution. 相似文献
218.
Richard S. Lehman 《Behavior research methods》1988,20(2):236-242
Members of the Society for Computers in Psychology responded to a survey concerning their programming practices and language use. The results reveal current hardware and software use; relationships among computer science training, task, and language choice and usage; and areas in which attention to some structured programming principles might improve the code that psychologists write. 相似文献
219.
This paper describes an amplifier for an electroencephalograph with gain of 1×104 to 1×106 and made entirely of commercially available IC components. The two-stage amplifier has a preamplifier stage with fixed gain of 1000, and a second stage with variable gain from 1 to 100. The final stage, an anti-aliasing filter, adds a gain of 10 to the signal. The circuit has high common mode rejection, low input bias current, very low noise characteristics, low offset voltages, and offset nulling capability built into the circuit. 相似文献
220.
A unique relationship exists between physicians and philosophers — one that expands on the constructive potential of the liaison between physicians and, for example, theologians, on the one hand, or, social workers on the other. This liaison should focus in the scientific aspects of medicine, not just the ethical aspects. Philosophers can provide physicians with a perspective on both the philosophy and the history of medicine through the ages — a sense of how medicine has adapted to the social cultural and ethical needs of each period. This perspective, while emphasizing medicine asscience, should not be limited to matters of methodology, or to criteria for distinguishing science from other intellectual pursuits, but should be concerned also with the history, sociology and politics of science. Both physicians and philosophers stand to gain from a strengthening of their active liaison now as never before; but most of all, the public will be the beneficiary. 相似文献