全文获取类型
收费全文 | 12111篇 |
免费 | 508篇 |
国内免费 | 6篇 |
出版年
2023年 | 67篇 |
2022年 | 62篇 |
2021年 | 122篇 |
2020年 | 218篇 |
2019年 | 254篇 |
2018年 | 338篇 |
2017年 | 310篇 |
2016年 | 370篇 |
2015年 | 243篇 |
2014年 | 334篇 |
2013年 | 1327篇 |
2012年 | 564篇 |
2011年 | 559篇 |
2010年 | 413篇 |
2009年 | 418篇 |
2008年 | 585篇 |
2007年 | 570篇 |
2006年 | 505篇 |
2005年 | 434篇 |
2004年 | 468篇 |
2003年 | 428篇 |
2002年 | 413篇 |
2001年 | 181篇 |
2000年 | 196篇 |
1999年 | 187篇 |
1998年 | 189篇 |
1997年 | 157篇 |
1996年 | 111篇 |
1995年 | 146篇 |
1994年 | 147篇 |
1993年 | 131篇 |
1992年 | 125篇 |
1991年 | 111篇 |
1990年 | 110篇 |
1989年 | 108篇 |
1988年 | 111篇 |
1987年 | 107篇 |
1986年 | 86篇 |
1985年 | 101篇 |
1984年 | 116篇 |
1983年 | 97篇 |
1982年 | 111篇 |
1981年 | 115篇 |
1980年 | 104篇 |
1979年 | 102篇 |
1978年 | 110篇 |
1977年 | 90篇 |
1976年 | 93篇 |
1975年 | 64篇 |
1974年 | 76篇 |
排序方式: 共有10000条查询结果,搜索用时 125 毫秒
71.
Summary Subjects tracked intervals in a synchronization paradigm at interval durations of 180, 210, 240, 270, 300, 400, 500, 600, 700, 800, 900, and 1,000 ms. The variability of intertap intervals (ITIs) shows a sudden increase near 300 ms. This increase is interpreted as indicating the transition from automatic to controlled movement. It is suggested that the sudden change in the variability of ITIs does not reflect the operation of different timing mechanisms at short and long intervals, but differences in the way in which attentional processes come to bear on movement initiation for different interval durations. In contrast to previous findings reported in the literature, a U-shaped function between interval duration and variability in the 300-to-1,000-ms range was not observed. 相似文献
72.
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
73.
74.
Michael M. Granaas 《Behavior research methods》1989,21(6):619-622
Emerson (1988) provided a simple C-language timing routine for use with PC AT class machines. Unfortunately, this version of the timing routine makes use of nonstandard functions that are not available in all C-language packages. A modified version of this timing routine that does not make use of one of these nonstandard functions is provided. This version of TIMEX runs under the widely available Microsoft C 5.1. The need and availability of the remaining four nonstandard C functions is discussed. Constants needed to convert the timing routine units into seconds and milliseconds are also provided. 相似文献
75.
In this study, we describe the process of transforming neuron polarization values that meet the assumptions of ratio data into ordinal data. This is a crisp-to-fuzzy set transformation. A computerized simulation of the application of this process is discussed and nonparametric methods of analyzing fuzzy-set data are presented. 相似文献
76.
A typical psychophysical experiment presents a sequence of visual stimuli to an observer and collects and stores the responses for later analysis. Although computers can speed up this process, paint programs that allow one to prepare visual stimuli without programming cannot read responses from the mouse or keyboard, whereas BASIC and other programming languages that allow one to collect and store observer’s responses unfortunately cannot handle prepainted pictures. A new programming language called The Director provides the best of both worlds. Its BASIC-like commands can manipulate prepainted pictures, read responses made with the mouse and keyboard, and save these on disk for later analysis. A dozen sample programs are provided. 相似文献
77.
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
78.
In this experiment adult subjects copied three types of material (letters, reversed letters and geometric shapes) with and without sight of the hand and the writing trace. Without vision the number of movement segments decreased and the sequence and direction of movements were altered. This means that subjects did not use a fixed stored representation to produce items nor did they obey the rules of Goodnow and Levine's (1973) grammar of action. When spatial location is made more difficult by the removal of vision, movement production is simplified to reduce the number of relocations required. The use of consistent directions of movement depends on the ability to use visual control of spatial location. 相似文献
79.
Lori J. Stark Keith D. Allen Michael Hurst David A. Nash Brooke Rigney Trevor F. Stokes 《Journal of applied behavior analysis》1989,22(3):297-307
We investigated the utilization and efficacy of distraction in reducing the anxious and disruptive behavior of 4 children undergoing dental treatment. During the distraction procedure, the children were shown a poster and told a story about it during dental treatment. They earned a prize if they attended to the poster and story and could correctly answer questions about them following each intervention visit. The children's disruptive behavior was assessed via direct observation, and results were analyzed within a multiple baseline design. The children exhibited high levels of anxious and disruptive behavior across baseline visits, regardless of the length of time in treatment or number of visits. Anxious and disruptive behavior decreased upon introduction of the intervention for all children. This was accompanied by the children meeting the criterion for correct answers on the distraction quiz. However, 2 of the children demonstrated an increase in their anxious and disruptive behavior across intervention visits. Results are discussed in terms of the need to evaluate treatment strategies that promote maintenance as well as initial changes. 相似文献
80.
The study examined the effects of job change characteristics on perceived career change and attitudes toward the new job. The job change characteristics examined were content of change, magnitude of change, direction of change, volitionality of job choice, and duration of the unemployment period between the two jobs. The subjects were 222 university educated men and women. It was found that perceived career change was firmly related to job change characteristics reflecting both "internal" and "external" career perspectives. After controlling for the direction of change, the magnitude of change had a negative impact on satisfaction with the new job, while the volitionality of job choice and the duration of unemployment were positively associated with job satisfaction. Contrary to expectation, the volitionality of job choice and the duration of unemployment did not increase the commitment to continue in the new job. 相似文献