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   2531篇
  免费   75篇
  国内免费   1篇
  2021年   13篇
  2020年   16篇
  2019年   35篇
  2018年   41篇
  2017年   49篇
  2016年   49篇
  2015年   35篇
  2014年   50篇
  2013年   255篇
  2012年   74篇
  2011年   110篇
  2010年   68篇
  2009年   50篇
  2008年   92篇
  2007年   91篇
  2006年   105篇
  2005年   99篇
  2004年   103篇
  2003年   99篇
  2002年   93篇
  2001年   25篇
  2000年   36篇
  1999年   40篇
  1998年   56篇
  1997年   44篇
  1996年   34篇
  1995年   38篇
  1994年   42篇
  1993年   43篇
  1992年   35篇
  1991年   28篇
  1990年   33篇
  1989年   29篇
  1988年   22篇
  1987年   27篇
  1986年   32篇
  1985年   24篇
  1984年   42篇
  1983年   41篇
  1982年   36篇
  1981年   47篇
  1980年   35篇
  1979年   41篇
  1978年   31篇
  1977年   30篇
  1976年   29篇
  1975年   35篇
  1974年   26篇
  1973年   18篇
  1972年   10篇
排序方式: 共有2607条查询结果,搜索用时 46 毫秒
961.
Infants over one month of age tend to produce two types of smiling during especially positive social interactions, Duchenne smiles involving cheek raising and open‐mouth smiles. Little is known, however, about the prevalence, frequency, duration and organization of these smiles among neonates. Twenty‐five full‐term, healthy neonates (12 female) were videotaped during six minutes of sleep. Smiles were identified and analysed using an anatomically based coding system (FACS/Baby FACS). One‐half of the neonates showed bilateral Duchenne smiles. One‐quarter of the neonates showed bilateral Duchenne smiles at a mature level of intensity whose median duration was 1? s. By contrast, open‐mouth bilateral smiles occurred in less than one‐tenth of the sample. The contrast between the more frequent bilateral Duchenne smiles and the less frequent open‐mouth smile is discussed in terms of the early synergistic functioning of facial muscles and contrasted with the smiling patterns of older infants.  相似文献   
962.
On the surface, ‘consumer understanding’ seems like a Motherhood and Apple Pie ‘good’ that no one could sensibly object to. In fact, our whole approach to consumer understanding – how we go about achieving it, for what purposes – masks a seller‐centric, command and control ideology of marketing. Successful companies are breaking free of this ideology, and reinventing market research in the process. Copyright © 2002 Henry Stewart Publications Ltd.  相似文献   
963.
Previous research has demonstrated that the localization of auditory or tactile stimuli can be biased by the simultaneous presentation of a visual stimulus from a different spatial position. We investigated whether auditory localization judgments could also be affected by the presentation of spatially displaced tactile stimuli, using a procedure designed to reveal perceptual interactions across modalities. Participants made left—right discrimination responses regarding the perceived location of sounds, which were presented either in isolation or together with tactile stimulation to the fingertips. The results demonstrate that the apparent location of a sound can be biased toward tactile stimulation when it is synchronous, but not when it is asynchronous, with the auditory event. Directing attention to the tactile modality did not increase the bias of sound localization toward synchronous tactile stimulation. These results provide the first demonstration of the tactilecapture of audition.  相似文献   
964.
Reid said little in his published writings about his contemporary Joseph Priestley, but his unpublished work is largely devoted to the latter. Much of Priestley's philosophical thought — his materialism, his determinism, his Lockean scientific realism - was as antithetical to Reid's as was Hume's philosophy in a very different way. Neither Reid nor Priestley formulated a full response to the other. Priestley's response to Reid came very early in his career, and is marked by haste and immaturity. In his last decade Reid worried much about Priestley's materialism, but that concern never reached publication. I document Reid's unpublished response to Priestley, and also view Reid's response from Priestley's perspective, as deduced from his published works. Both thinkers attempted to base their arguments on Newtonian method. Reid's position is the more puzzling of the two, since he nowhere makes clear how Newtonian method favours mind-body dualism over materialism, which is the central debate between them.  相似文献   
965.
The authors examined the degree to which the supportiveness of a patient's family environment predicts change in quality of life following renal transplantation. The sample consisted of 95 patients receiving renal grafts from either a living donor or a cadaveric donor. Patients were initially assessed prior to transplantation with follow-up assessment occurring an average of 5.5 months after transplantation. Among patients receiving a living-donor kidney, those reporting a more supportive family environment exhibited reduced depression, improved mobility, and improved social functioning. However, those living-donor recipients reporting less family support exhibited increased depression and diminished mobility and social functioning after transplantation. Patients receiving a kidney from a cadaveric donor showed modest improvements in quality of life regardless of the degree of family support.  相似文献   
966.
Research has shown that the memory characteristics questionnaire (MCQ) can be used to discriminate between ‘memories’ of perceived events and ‘memories’ of imagined events. The present study extended this research by examining the utility of the MCQ in distinguishing impossible memories (i.e., reports of an event a person could not have witnessed). Congruent with previous research, a considerable number of participants in both the pilot study (45%) and the main study (44%) were willing to report that they had seen a non‐existent film of the car crash in which Diana, Princess of Wales was killed. The MCQ ratings of three groups of participants were therefore compared: (1) those who indicated that they had seen the non‐existent film, (2) those who were asked to imagine having seen the film, and (3) a control group who were asked to rate their memory of when they first heard the news of the crash. The MCQ did not serve to distinguish impossible memories, but there were reliable differences on one of the MCQ subscales between those who imagined the film and controls. Furthermore, participants who reported that they had seen the film gave higher scores on the Self Monitoring scale. Implications are discussed. Copyright © 2002 John Wiley & Sons, Ltd.  相似文献   
967.
968.
This paper explores and reflects upon the body of relevant social science data sources containing insights into gay male socio-sexual lifestyles. Considerable deficiencies seem to feature in this regard with respect to coverage, consistency, content and usability. The various reasons for collecting data on gay male lifestyles are considered and thought given as to some particular strengths and weaknesses. Examples of datasets and surveys are used in this light to potentially inform future developments and a critical perspective on their usage.
Samuel CameronEmail: Email:
  相似文献   
969.
Inoue and Matsuzawa (Curr Biol 17: R1004–R1005, 2007) showed that with an accuracy of approximately 79%, the juvenile chimpanzee, Ayumu, could recall the position and order of a random subset of five Arabic numerals between one and nine when those numerals were presented for only 210 ms on a computer touch screen before being masked with white squares. None of nine humans working on the same task approached this level of accuracy. Inoue and Matsuzawa (2007) claimed this performance difference was evidence of a memorial capacity in young chimpanzees that was superior to that seen in adult humans. While the between-species performance difference they report is apparent in their data, so too is a large difference in practice on their task: Ayumu had many sessions of practice on their task before terminal performances were measured; their human subjects had none. The present report shows that when two humans are given practice in the Inoue and Matsuzawa (2007) memory task, their accuracy levels match those of Ayumu.  相似文献   
970.
Pigeons were exposed to a repeated acquisition procedure in which no delays were imposed and rate of responding was relatively high. They also were exposed to conditions in which delays were arranged between trials within chains or between completed chains, and rates of responding were lower. Number of trials, rate of reinforcement, difficulty of the discrimination, and motivating operations were held constant. Terminal accuracy was highest under the no‐delay condition, in which rate of responding was highest. Effects of trial spacing on retention were mixed and depended on whether delays were imposed between trials within chains or between completed chains. These findings provide basic‐research support for the rapid presentation of trials in direct instruction and for rate building in precision teaching.  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