全文获取类型
收费全文 | 23958篇 |
免费 | 972篇 |
国内免费 | 14篇 |
专业分类
24944篇 |
出版年
2020年 | 264篇 |
2019年 | 270篇 |
2018年 | 450篇 |
2017年 | 401篇 |
2016年 | 426篇 |
2015年 | 278篇 |
2014年 | 404篇 |
2013年 | 1789篇 |
2012年 | 684篇 |
2011年 | 774篇 |
2010年 | 417篇 |
2009年 | 485篇 |
2008年 | 675篇 |
2007年 | 668篇 |
2006年 | 641篇 |
2005年 | 570篇 |
2004年 | 556篇 |
2003年 | 542篇 |
2002年 | 496篇 |
2001年 | 818篇 |
2000年 | 827篇 |
1999年 | 623篇 |
1998年 | 287篇 |
1997年 | 253篇 |
1993年 | 231篇 |
1992年 | 518篇 |
1991年 | 450篇 |
1990年 | 514篇 |
1989年 | 436篇 |
1988年 | 405篇 |
1987年 | 392篇 |
1986年 | 417篇 |
1985年 | 460篇 |
1984年 | 371篇 |
1983年 | 323篇 |
1982年 | 253篇 |
1981年 | 238篇 |
1979年 | 361篇 |
1978年 | 285篇 |
1977年 | 233篇 |
1976年 | 227篇 |
1975年 | 333篇 |
1974年 | 370篇 |
1973年 | 367篇 |
1972年 | 284篇 |
1971年 | 248篇 |
1969年 | 232篇 |
1968年 | 294篇 |
1967年 | 256篇 |
1966年 | 276篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
981.
Four experiments examined the conceptual organization of narrative passages and the extent to which these representations were explanatory in a variety of experimental tasks. The conceptual representation of a passage consisted of a graph of labeled nodes and labeled, directed arcs which were adopted from the Conceptual Dependency Theory. These representations included both explicitly stated information and inferences which had been empirically extracted by a question-answering procedure. Symbolic procedures for answering how- and why-questions were also delineated. The conceptual representations and the symbolic procedures that operate on these representations together accounted for 91% of the answers generated from question-answering protocols in Experiment 1, and also the rated quality of specific answers to specific questions in Experiment 2. Experiments 3 and 4 supported the hypothesis that structural properties of the representations can predict recall of explicitly stated nodes and verification ratings of inference nodes. The results provide encouraging support for the proposed graphic representations and also for the use of question-answering protocols in uncovering prose inferences. 相似文献
982.
Forty eight couples with impotence, anorgasmia or loss of libido were randomly allocated to one of three treatment conditions: (i) modified Masters and Johnson (male and female therapist), (ii) modified Masters and Johnson (one therapist) and (iii) marital therapy and relaxation comparison procedure (one therapist). The major variables investigated were type of therapy, number of therapists (one or two) and sex of therapist. Post-treatment and one year follow-up assessments showed no significant difference in outcome between treatment approaches. No significant effects were found for sex of therapist and the interaction between sex of therapist and sex of presenter. 相似文献
983.
984.
Herbert P. Ginsburg Jill K. Posner Robert L. Russell 《International journal of psychology》1981,16(1-4):13-34
This study is concerned with the manner in which Western mathematics is assimilated by children raised in traditional African cultures. It was predicted that after an initial period of difficulty in learning school arithmetic, African children (Baoulé and Dioula from the Ivory Coast) acquire basic concepts, develop invented strategies, and make errors similar to those of American children. Further, it was predicted that Dioula children, since they are members of a commercial culture, perform at a somewhat higher level than the Baoulé, members of a farming culture which does not seem to stress computational activity. To investigate these hypotheses, American, Baoulé, and Dioula children at two age levels were given a variety of arithmetic problems involving basic skills (e.g., reading numbers), number knowledge (e.g., place value), and calculational abilities (e.g., written computation). The results showed that, in general, older African and American children (fifth- and sixth-graders) were quite similar in all respects. The only large and significant differences occurred in the case of younger children (second- and third-graders). At this level American children generally performed at a higher level than Africans, as predicted, and Dioula occasionally at a higher level than Baoulé, also as predicted. At the same time, qualitative aspects of African and American children's performance were similar: for example, both groups made the same types and proportions of errors in written calculations. The results generally support the hypotheses and can be explained in terms of both educational and cognitive factors. 相似文献
985.
Alan VanBiervliet Paul F. Spangler Ann M. Marshall 《Journal of applied behavior analysis》1981,14(3):295-305
Typically in large residential facilities for retarded persons, meals are served in an institutional style that does not appear to encourage appropriate peer interactions. An ecological program alternative is serving meals in a family style. The present study was designed to examine both the feasibility of serving family style meals and the effects of family style meal service on mealtime language. Five retarded young adult male residents, who had some conversational skills and appropriate table manners, participated in this study. The experimental design involved a multiple baseline analysis across meals (dinner, lunch, and breakfast). Observers coded the youths' mealtime verbalizations according to the type, content, and direction of the verbalizations and they recorded the length of the meals. The analysis of the verbalization data indicated that during family style meals the participants spoke substantially more often than during institutional style meals. Increases in peer-directed conversation about the meals primarily accounted for the verbalization changes. Family style serving also resulted in the youths spending more time with their meals. In addition, social validation measures suggested that the family style procedures were preferred by the consumers (participants, staff, and concerned community members). 相似文献
986.
The majority of the thousands of industrial arts majors that graduate each year in the nation take jobs in business and industry—not as teachers in schools and colleges as in the past. Many counselors are unaware of this and many other important facts about the field of industrial arts. This article provides insights to prepare job counselors as they counsel potential and established industrial arts majors and graduates. 相似文献
987.
Richard J Harris David M Messick Keith P Sentis 《Journal of experimental social psychology》1981,17(2):210-225
Messick and Sentis found greater support for weak proportionality in subjects' outcome allocations (suggesting that subjects wish to maintain a constant ratio between outcomes across situations when inputs are held constant) than for constant differences between outcomes. They claimed that their data thus provided stronger support for Adams' ratio definition of equity than for Harris' linear formula. A dialogue between the two sets of authors establishes that (1) so far as their specification of fair outcomes is concerned, Adams' formula is a special case of the linear formula; (2) weak proportionality does not necessarily follow from Adams' formula and can be derived from the linear formula; (3) Adams' formula applied to subjective (rather than experimenter-defined) inputs nevertheless provides a more natural base from which to derive weak proportionality than does the linear formula in its general form; (4) excellent fits to several sets of data, including much better fit to Messick and Sentis' data than that provided by weak proportionality, are obtained if we assume that subjects use allocations which are a weighted average of those implied by Adams' formula, the Equality principle, and Komorita and Kravitz' Equal Excess Norm; and (5) a fit to Messick and Sentis' data that is almost as good as that provided by the weighted solutions model is obtained by assuming that subjects apply Adams' formula to subjective inputs and subjective outcomes that are different from the corresponding experimenter-defined values. It is agreed that the delineation of the relationships among observable properties of outcome distributions, alternative equity formulae, and different psychological processes is as important as it can be devious. 相似文献
988.
Harold P. Edman John H. Greist Marjorie H. Klein James W. Jefferson Carl Getto 《Behavior research methods》1981,13(4):393-398
The use of computers in psychiatry and psychology is reviewed. It is noted that computers are already being used successfully for consultation, interviewing, and continuing education. Issues related to the usage of computers in mental health are discussed. Guidelines for future work in the area are suggested. 相似文献
989.
Alan J. Parkin 《Current psychology (New Brunswick, N.J.)》1981,1(3-4):291-300
This paper reports two cued recall experiments in which the degree of preexperimental associative strength between rhyming cues and their respective targets is manipulated whilst holding the extent of informational overlap between them constant. Both experiments show that strong rhyming cues are more efficient than weak rhyming cues in eliciting target retrieval in both a short-term and a long-term memory situation. The results are interpreted as consistent with the generationrecognition theory of retrieval and inconsistent with predictions made by the encoding specificity principle. It is therefore suggested that caution must be applied when extending the encoding specificity principle to experimental situations other than that from which it is derived. Implications for the distinction between scanning and reconstructive modes of retrieval are also briefly considered. 相似文献
990.