首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   23687篇
  免费   817篇
  国内免费   11篇
  2020年   241篇
  2019年   254篇
  2018年   415篇
  2017年   431篇
  2016年   428篇
  2015年   279篇
  2014年   359篇
  2013年   1826篇
  2012年   704篇
  2011年   749篇
  2010年   476篇
  2009年   411篇
  2008年   645篇
  2007年   610篇
  2006年   549篇
  2005年   475篇
  2004年   464篇
  2003年   417篇
  2002年   472篇
  2001年   728篇
  2000年   756篇
  1999年   567篇
  1998年   258篇
  1997年   214篇
  1992年   453篇
  1991年   407篇
  1990年   442篇
  1989年   415篇
  1988年   397篇
  1987年   404篇
  1986年   406篇
  1985年   422篇
  1984年   334篇
  1983年   300篇
  1982年   239篇
  1981年   214篇
  1979年   387篇
  1978年   279篇
  1977年   252篇
  1976年   224篇
  1975年   343篇
  1974年   375篇
  1973年   358篇
  1972年   329篇
  1971年   295篇
  1970年   260篇
  1969年   324篇
  1968年   365篇
  1967年   321篇
  1966年   329篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
921.
Research in several disciplines reveals large individual differences in orientations to romantic love, yet the origins of the differences have been unclear In this first behavior genetic study of romantic love, biometric model fitting reveals that in contrast to other personality and attitude domains, where genetic factors account for approximately 50% of the reliable variance and shared environment has little effect, individual differences in romantic love are due almost exclusively to environment Moreover, the common family environment plays a sizable role in determining love styles, a finding compatible with theories stressing the importance of family interactions in personality development  相似文献   
922.
FROM BLOBS TO BOUNDARY EDGES:   总被引:13,自引:1,他引:12  
  相似文献   
923.
The accreditation standards outlined in the article are used by the International Association of Counseling Services, Inc., as the basis for the formal accreditation of college and university counseling programs throughout the United States and Canada. They reflect the program elements and practice standards that are deemed essential in a counseling center that provides high-quality services to students.  相似文献   
924.
In order to develop an additional measure of availability for the nouns from Paivio, Yuille, and Madigan’s (1968) list, we used a CD-ROM version of theOxford English Dictionary (OED) to obtain the number of times a word was used to define other words. This variable was added to Rubin and Friendly’s (1986) set of measures for these words. In multiple regression analyses, our measure proved to be a useful predictor of free recall. These results suggest that the OED may be useful for providing additional psycholinguistic measures.  相似文献   
925.
One thousand, one hundred and twenty-one Jewish concentration camp survivors were compared with 367 Jewish controls who had not been in a concentration camp, and had not lost any family members in such a camp. Of interest was the mortality of camp and comparison groups, on the hypothesis that the stress of being in a camp would adversely affect inmates. It was found that former camp inmates were over twice as likely to die of cancer, coronary heart diesease, or other causes as the comparison subjects of similar age and sex composition, and that severity of stress was correlated with mortality in the expected direction. Diathesis, determined by means of a special interviewer-administrated questionnaire, was found to interact synergistically with stress in producing high mortality.  相似文献   
926.
Psychosocial adjustment in 66 patients with chronic rheumatoid arthritis, with a mean duration of 12 years with the disease, were evaluated in a prospective design, with 62% of the sample followed up 16 months later. It was predicted that dispositional optimism would predict adjustment over time and that perceived support and perceived control would be related to psychosocial adjustment at the time of concurrent measurement. At Time 1, psychosocial adjustment was associated with greater optimism and perceived support and less disability. Optimism at Time 1 was the only significant predictor of changes in adjustment at Time 2 controlling for Time 1 adjustment and Time 2 disability. It was found that optimism temporally precedes increases in psychosocial adjustment. In terms of coping strategies, wishful thinking was related to poorer social adjustment, whereas problem-focused coping was marginally related to positive adjustment. Neither coping strategy predicted adjustment across time. Optimism at Time 1 did predict problem-focused coping at Time 2. Perceived social support regarding a specific circumstance at a given point in time enables one to persist in solving a task. Interventions to enhance the quality of life of individuals coping with progressive deteriorative disease must look at the influence of their behavior and attitude on those who provide care for them.  相似文献   
927.
Science and the Catholic church are both conservative, slow-to-change institutions. However, science has institutionalized procedures that ensure that ample amounts of criticism of currently accepted theories and methodologies will always be present. This arrangement of continuous conjectures and refutation in science ensures often slow but steady change. Because supporters often think of religions as trafficking in timeless truths, criticism of church beliefs and practices (even when intended to stimulate reflection and improvement) is frequently seen as being disloyal to the institution. Because of the growing crises caused by world overpopulation, I argue that the Catholic church's opposition to all artificial methods of birth control now lacks whatever moral force it might have had when originally promulgated. By highlighting theological perspectives that might be appropriate for the ecological realities of the 21st century, I hope the church will see the wisdom of reevaluating many of its positions in the light of rapidly approaching ecological imperatives.  相似文献   
928.
Estimates of temporal proximity (sometimes called time-to-collision) from random-dot flow patterns are shown to be based upon retinal speed, rather than upon changes in dot density. Neither the spatial nor the temporal gradient of motion is essential to the task, but estimates can be made from either alone. Performance is unaffected by the addition of rotational motion, suggesting that observers axe capable of extracting the radial component of motion, which contains all the relevant information, from complex stimuli.  相似文献   
929.
The study included 17 patients, 12 women and 5 men, with a recurrent symptom complex involving chest pain and dyspnoea characterized by inability to get a full breath. Some attacks had subsided spontaneously. Others had lasted hours or days. When examined by fluoroscopy during an attack, each subject was found to have a nearly maximally contracted (flat) diaphragm. In some of them the attack was promptly interrupted by a small intravenous injection of sodium amytal. In others it could be aborted by a conscious effort at full expiration. The syndrome associated with diaphragmatic spasm is discussed in comparison with other noncardiac sources of chest pain and dyspnoea.  相似文献   
930.
Angular induction is the process by which one line segment can bias judgment of orientation and/or collinearity of another segment, and it has been established that the magnitude of error is a determinate function of the relative angle between the two. We examined how these known relationships are affected by decomposing the induction segment into an array of scattered points. The bias that was produced by such arrays was found to be consistent with a formal model of angular induction, with the strength of the effect decreasing as the scatter among the points was increased. This decline in strength was almost linear with a logarithmic transform of the dimensions of the stimulus array. We also evaluated the hypothesis that the induction stimulus is detected by one or more channels—for example, neurons—for which the sensitivity profiles are modeled as Gabor wavelets. The change in induction strength with increasing point scatter was not predicted by a single width of channel. However, the combined activity of an ensemble of channels that differed in width did match the perceptual effects if one also stipulated that each channel would respond maximally to a fine-line stimulus.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号