全文获取类型
收费全文 | 13009篇 |
免费 | 539篇 |
国内免费 | 3篇 |
出版年
2020年 | 137篇 |
2019年 | 172篇 |
2018年 | 246篇 |
2017年 | 273篇 |
2016年 | 272篇 |
2015年 | 207篇 |
2014年 | 269篇 |
2013年 | 1463篇 |
2012年 | 467篇 |
2011年 | 510篇 |
2010年 | 312篇 |
2009年 | 328篇 |
2008年 | 497篇 |
2007年 | 453篇 |
2006年 | 441篇 |
2005年 | 442篇 |
2004年 | 442篇 |
2003年 | 428篇 |
2002年 | 456篇 |
2001年 | 223篇 |
2000年 | 189篇 |
1999年 | 201篇 |
1998年 | 215篇 |
1997年 | 208篇 |
1996年 | 168篇 |
1995年 | 174篇 |
1994年 | 165篇 |
1993年 | 186篇 |
1992年 | 170篇 |
1991年 | 147篇 |
1990年 | 146篇 |
1989年 | 133篇 |
1988年 | 120篇 |
1987年 | 136篇 |
1986年 | 119篇 |
1985年 | 150篇 |
1984年 | 193篇 |
1983年 | 198篇 |
1982年 | 195篇 |
1981年 | 178篇 |
1980年 | 141篇 |
1979年 | 144篇 |
1978年 | 183篇 |
1977年 | 161篇 |
1976年 | 165篇 |
1975年 | 146篇 |
1974年 | 158篇 |
1973年 | 109篇 |
1972年 | 77篇 |
1968年 | 75篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
221.
222.
John Brady 《Behavior research methods》1993,25(2):328-332
The notions of objects and attributes are essential to knowledge representation. Rudolf Wille’s concept lattices group objects and attributes into concepts, with concepts organized in a lattice, so that some concepts are subconcepts of others. This paper applies certain aspects of type theory to concept lattices in order better to facilitate the representation of knowledge inRoget’s International Thesaurus. Of particular interest is a formal analysis of functions providing concept lattices with a way of representing procedures and actions that currently are not present in the thesaurus. 相似文献
223.
A collection of 4,741 word fragments that have a unique completion is described. All word fragments are specified by two letters (e.g.,__Q__U__can only be completed by the word LIQUEURS). The words completing these fragments range in length from five to nine letters. The fragments are unique with respect to a pool of 146,205 words, which helps rule out the possibility that obscure words could be used as a completion to the fragments. The collection of fragments as well as the words that complete them is available in ASCII format on computer disks or in printed form. 相似文献
224.
Wolfram Boucsein Annette Valentin John J. Furedy 《Integrative psychological & behavioral science》1993,28(3):213-225
Differences related to age and to specific neurological (Parkinsonian) damage were studied by contrasting, respectively, old (mean age 64 years) and young (27 years) subjects (N=15), and old-normal (N=15) and old-Parkinsonian (N=15) subjects. Both behavioral as well as psychophysiological dependent variables were employed. The behavioral measure was performance on a discrimination learning task, while the psychophysiological measures were based on habituation to a repeated tone stimulus and on a Pavlovian differential conditioning preparation. The behavioral task showed predominantly age-related differences, with the young learning faster. Another age-related difference was interpreted as showing a more insight-like learning process in the young. Response-bias (beta) values did not differ between groups. Age-related differences also emerged more clearly than specific-neurological-damage differences in the psychophysiological data. The older subjects manifested markedly less autonomic conditioning, which was probably due to a lowering of reactivity, as well as the emergence of habituation to the (loud-noise) unconditional stimulus. A correlational analysis of discrimination conditioning also yielded age-related differences. Most notably, reactivity played a greater role in conditioning in the old than in the young subjects. The results illustrated how psychophysiological measures can provide information that complements those provided by behavioral measures. 相似文献
225.
226.
ABSTRACT Subjects consisted of a sample of two cohorts of approximately 100 boys each whose behaviors were rated by their parents and teachers. Criterion variables included antisocial behavior, based on parent, child, teacher, and interviewer reports, and delinquency, based on parent and child reports in addition to cumulative arrest data taken from juvenile court records. The data suggest that mothers are focused on the daily, irritating behaviors of their sons. Teachers, on the other hand, appear to focus on a relatively small number of items (e.g., child physically attacks others, associates with deviant peers), and thereby provide ratings that are better predictors of delinquency and arrest. When the mothers' ratings were constrained to include only items that were salient for teachers, their predictive validity coefficients approached the magnitude of the teacher coefficients. 相似文献
227.
John D. Vogelsang Ph.D. 《Journal of religion and health》1993,32(3):197-208
This article offers a definition of sexual abuse in the ministerial relationship and describes a systemic approach for intervening that cares for the needs of victims and perpetrators, and provides an opportunity for congregations to move from denial to hope both spiritually and organizationally.He is the author of many articles on organizational structure and Christian social action. 相似文献
228.
Genetic and Environmental Effects on Openness to Experience, Agreeableness, and Conscientiousness: An Adoption/Twin Study 总被引:4,自引:0,他引:4
C. S. Bergeman Heather M. Chlpuer Robert Plomin Nancy L. Pedersen G. E. McClearn John R. Nesselroade Paul T. Costa Jr. Robert R. McCrae 《Journal of personality》1993,61(2):159-179
ABSTRACT Previous research has indicated that extraversion and neuroticism are substantially affected both by genotype and environment. This study assesses genetic and environmental influences on the other three components of the five-factor model of personality: Openness to Experience, Agreeableness, and Conscientiousness. An abbreviated version of the NEO Personality Inventory (NEO-PI) was administered to 82 pairs of identical twins and 171 pairs of fraternal twins reared apart and 132 pairs of identical twins and 167 pairs of fraternal twins reared together. Estimates of genetic and environmental effects for Openness and Conscientiousness were similar to those found in other studies of personality: Genetic influence was substantial and there was little evidence of shared rearing environment. Results for Agreeableness were different: Genetic influence accounted for only 12% of the variance and shared rearing environment accounted for 21% of the variance. Few significant gender or age differences for genetic and environmental parameters were found in model-fitting analyses. 相似文献
229.
John F. Horty 《Philosophical Studies》1993,72(2-3):223-263
Conclusion In contemporary work, the distinction between the proposition expressed by a sentence and its psychological significance is usually motivated by a familiar kind of counterfactual argument; and the discussion of these issues usually centers around the role of external factors in determining the meaning of our words. My primary goal in this paper has been to show that a similar, though not identical, distinction between two aspects of meaning can be developed entirely on the basis of considerations internal to language users — their cognitive limitations. To make this point, I have focused on symbols introduced through stipulative definitions. In a language containing such symbols, certain expressions and their definitional reductions will seem to differ in psychological significance for creatures with limited intellects, and so in any aspect of meaning that is supposed to correlate with psychological significance; but it seems also that there is some important aspect of meaning that they share.I have argued that a distinction in meaning like this — between sense and psychological significance — should be drawn even in the kind of languages of most concern to Frege, and that his failure to do so led to tensions in his thought. Of course, this observation only touches on the many issues involved in interpreting Frege's theory of definition more generally. I have not tried to describe here, for example, the ways in which the weak interpretation of fruitfulness might interact with the more robust interpretation mentioned earlier; I have only mentioned Frege's view on explicative definitions and the paradox of analysis, and failed even to mention either his treatment of contextual definition, or his peculiar objections to conditional definitions. I do want to emphasize, however, that the distinction drawn here is not simply a matter of Frege scholarship, but that it has some contemporary relevance as well. As we have seen, Frege's semantic goals often coincide with our own; and a number of contemporary writers are explicitly concerned, like Frege, to construct a semantic theory that is able to account for differences in meaning among logically equivalent expressions. Any such theorist should recognize a distinction like that drawn here between sense and psychological significance, and should avoid subjecting an account of one notion to constraints appropriate only for the other. 相似文献
230.
Peter S. Jensen Doreen Koretz Ben Z. Locke Stanley Schneider Marian Radke-Yarrow John E. Richters Judith M. Rumsey 《Journal of abnormal child psychology》1993,21(5):551-580
In November 1990 the National Institute of Mental Health (NIMH) convened a special conference of over 100 scientists and leaders to outline specific strategies and research initiatives that should be developed to implement the recently released National Plan for Research on Child and Adolescent Mental Disorders.Participants included journal editors, educators from psychology and psychiatry, representatives from private foundations, and leaders of research program areas in public funding agencies. Critical knowledge gaps were identified in five areas of child and adolescent psychopathology, including depression, attention deficit hyperactivity disorder, conduct disorder, the anxiety disorders, and the developmental disorders. For each of these areas, special emphasis was placed on developing new ideas and obtaining critical input from other areas of investigation. This report summarizes the identified research gaps and recommends research initiatives to implement the National Plan, as outlined by the conference participants. 相似文献