全文获取类型
收费全文 | 10844篇 |
免费 | 269篇 |
国内免费 | 3篇 |
出版年
2020年 | 73篇 |
2019年 | 90篇 |
2018年 | 232篇 |
2017年 | 216篇 |
2016年 | 309篇 |
2015年 | 200篇 |
2014年 | 143篇 |
2013年 | 609篇 |
2012年 | 470篇 |
2011年 | 486篇 |
2010年 | 161篇 |
2009年 | 156篇 |
2008年 | 195篇 |
2007年 | 188篇 |
2006年 | 192篇 |
2005年 | 1470篇 |
2004年 | 776篇 |
2003年 | 572篇 |
2002年 | 262篇 |
2001年 | 230篇 |
2000年 | 206篇 |
1999年 | 182篇 |
1998年 | 59篇 |
1993年 | 60篇 |
1992年 | 140篇 |
1991年 | 154篇 |
1990年 | 169篇 |
1989年 | 141篇 |
1988年 | 118篇 |
1987年 | 137篇 |
1986年 | 136篇 |
1985年 | 134篇 |
1984年 | 121篇 |
1983年 | 95篇 |
1982年 | 58篇 |
1981年 | 58篇 |
1980年 | 59篇 |
1979年 | 140篇 |
1978年 | 70篇 |
1976年 | 72篇 |
1975年 | 107篇 |
1974年 | 134篇 |
1973年 | 122篇 |
1972年 | 100篇 |
1971年 | 103篇 |
1970年 | 93篇 |
1969年 | 100篇 |
1968年 | 90篇 |
1967年 | 105篇 |
1966年 | 67篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
121.
Gary W. Evans Stephen V. Jacobs David Dooley Ralph Catalano 《American journal of community psychology》1987,15(1):23-34
One of the possible adaptive costs of coping with stress is diminished capacity to respond to subsequent adaptive demands. This paper examined the complex interplay between major life events and one source of chronic strain. Residents of the greater Los Angeles metropolitan area exposed to higher levels of smog, who had also experienced a recent stressful life event, exhibited poorer mental health than those exposed to pollution who had not experienced a recent stressful life event. There were, however, no direct effects of smog levels on mental health. These patterns of results were replicated in both a cross-sectional and a longitudinal study. The interplay of psychosocial vulnerability and environmental conditions is discussed. 相似文献
122.
Electromagnetic articulography: use of alternating magnetic fields for tracking movements of multiple points inside and outside the vocal tract 总被引:3,自引:0,他引:3
The purpose of this paper is to present a new electromagnetic device which uses alternating magnetic fields for tracking movements of multiple points inside and outside the vocal tract. It is biologically safe, noninvasive, it does not interfere with speech movements, allows for multiple recording in the same subject, and for easy collection of large amounts of data. It is especially suitable for evaluation of patients with speech motor impairments. 相似文献
123.
124.
A long-term temporal component of working memory of rats trained on the radial maze has been shown to be susceptible to disruption by the protein synthesis inhibitor, anisomycin. It is not clear whether protein synthesis played a role in working memory because accurate performance on the radial maze required the storage of a large amount of information, or because the information was to be held in store for relatively long periods of time. This experiment tested these hypotheses by assessing the effect of anisomycin on choice accuracy in a comparatively simple spatial delayed alternation task. Results indicate that under the present training conditions, protein involvement in working memory is related more to the length of the retention interval than to the amount of information retained. 相似文献
125.
The religious client presents a particular challenge to the RET therapist in that the irrational beliefs responsible for the client's problems are often created or supported by distortions in the religious belief system. This paper will discuss the connections between religious distortions and the irrational ideas, ways to deal with them, and then present the most common religiously based irrational beliefs along with biblical disputations.Constance Lawrence, M.S., is Director of the Christian Counseling Center in Norwalk, CT, and also has a private practice in Weston, CT. 相似文献
126.
127.
A report on the clinical testing of the lithium-retard medicament Contemnol (Spofa). It details the way lithium-retard treatment is objectively and subjectively superior to the earlier and still current general lithium treatment. 相似文献
128.
H J Otto E Willenberg D Müller R H?fs J Freitag A Fiedler R Steinke 《Psychiatrie, Neurologie, und medizinische Psychologie》1987,39(12):748-753
The results of an evaluation of the perfusion scintigraphy findings of 350 hospitalised neurological patients and 55 more strictly selected neurosurgical patients with cerebrovascular complaints, revealed an accuraty of 83%, a sensitivity of 89%, and a specificity of 83%. The selection of the patients had no influence on the results as a whole. Compared with contrast-medium angiography, incorrect diagnosis must be expected in 17% of the cases. This includes erroneous negative findings in 10% of the cases. Grounds for misinterpretations are suggested, and the biological and methodological limitations of the method are set forth. 相似文献
129.
A computer-based measure of resultant achievement motivation 总被引:2,自引:0,他引:2
V Blankenship 《Journal of personality and social psychology》1987,53(2):361-372
Three experiments were conducted to develop a computer-based measure of individual differences in resultant achievement motivation (RAM) on the basis of level-of-aspiration, achievement motivation, and dynamics-of-action theories. In Experiment 1, the number of atypical shifts and greater responsiveness to incentives on 21 trials with choices among easy, intermediate, and difficult levels of an achievement-oriented game were positively correlated and were found to differentiate the 62 subjects (31 men, 31 women) on the amount of time they spent at a nonachievement task (watching a color design) 1 week later. In Experiment 2, test-retest reliability was established with the use of 67 subjects (15 men, 52 women). Point and no-point trials were offered in blocks, with point trials first for half the subjects and no-point trials first for the other half. Reliability was higher for the atypical-shift measure than for the incentive-responsiveness measure and was higher when points were offered first. In Experiment 3, computer anxiety was manipulated by creating a simulated computer breakdown in the experimental condition. Fifty-nine subjects (13 men, 46 women) were randomly assigned to the experimental condition or to one of two control conditions (an interruption condition and a no-interruption condition). Subjects with low RAM, as demonstrated by a low number of typical shifts, took longer to choose the achievement-oriented task, as predicted by the dynamics-of-action theory. The difference was evident in all conditions and most striking in the computer-breakdown condition. A change of focus from atypical to typical shifts is discussed. 相似文献
130.
W V Dube W J McIlvane H A Mackay L T Stoddard 《Journal of the experimental analysis of behavior》1987,47(2):159-175
In an arbitrary matching-to-sample procedure, two mentally retarded subjects learned conditional discriminations with two sets of stimuli. Each set included a spoken name (N1 or N2), an object (O1 or O2), and a printed symbol (S1 or S2). One subject selected conditionally (a) O1 upon N1, and O2 upon N2, and (b) S1 upon O1, and S2 upon O2. The other subject selected conditionally (a) S1 upon N1, and S2 upon N2, and (b) O1 upon S1, and O2 upon S2. For both subjects, selections of O1 and S1 produced one type of food, F1; selections of O2 and S2 produced a different type of food, F2. Both subjects also learned identity-matching performances, selecting O1, O2, S1, S2, F1, and F2 conditionally upon those stimuli as samples; F1 followed selections of O1, S1, and F1; F2 followed selections of O2, S2, and F2. Matching performances consistent with stimulus class formation involving the names, objects, symbols, and foods were demonstrated on probe trials, even though these performances had not been taught explicitly. Next, new objects, X1 and X2, were presented on identity-matching trials, producing F1 and F2, respectively. Without further training, X1 was selected conditionally upon N1, S1, and O1, and X2 was selected upon N2, S2, and O2. When the contingencies were changed so that selections of X1 and X2 were now followed by F2 and F1, respectively, X2 was selected conditionally upon N1, S1, and O1, and X1 was selected upon N2, S2, and O2. Class membership of X1 and X2 had apparently changed. This study provides evidence that reinforcers may become members of stimulus classes, and that new stimuli may become class members through relations with reinforcers. 相似文献