全文获取类型
收费全文 | 4479篇 |
免费 | 267篇 |
出版年
2023年 | 33篇 |
2022年 | 59篇 |
2021年 | 74篇 |
2020年 | 147篇 |
2019年 | 112篇 |
2018年 | 212篇 |
2017年 | 202篇 |
2016年 | 230篇 |
2015年 | 177篇 |
2014年 | 192篇 |
2013年 | 650篇 |
2012年 | 238篇 |
2011年 | 245篇 |
2010年 | 148篇 |
2009年 | 155篇 |
2008年 | 217篇 |
2007年 | 208篇 |
2006年 | 161篇 |
2005年 | 117篇 |
2004年 | 117篇 |
2003年 | 138篇 |
2002年 | 103篇 |
2001年 | 80篇 |
2000年 | 98篇 |
1999年 | 55篇 |
1998年 | 37篇 |
1997年 | 33篇 |
1996年 | 32篇 |
1995年 | 22篇 |
1994年 | 23篇 |
1993年 | 23篇 |
1992年 | 20篇 |
1991年 | 24篇 |
1990年 | 20篇 |
1989年 | 17篇 |
1987年 | 12篇 |
1984年 | 16篇 |
1983年 | 14篇 |
1982年 | 18篇 |
1980年 | 13篇 |
1979年 | 14篇 |
1978年 | 12篇 |
1977年 | 11篇 |
1975年 | 15篇 |
1974年 | 13篇 |
1972年 | 12篇 |
1971年 | 16篇 |
1970年 | 14篇 |
1967年 | 12篇 |
1966年 | 9篇 |
排序方式: 共有4746条查询结果,搜索用时 15 毫秒
31.
32.
A general approach to confirmatory maximum likelihood factor analysis 总被引:17,自引:0,他引:17
K. G. Jöreskog 《Psychometrika》1969,34(2):183-202
We describe a general procedure by which any number of parameters of the factor analytic model can be held fixed at any values and the remaining free parameters estimated by the maximum likelihood method. The generality of the approach makes it possible to deal with all kinds of solutions: orthogonal, oblique and various mixtures of these. By choosing the fixed parameters appropriately, factors can be defined to have desired properties and make subsequent rotation unnecessary. The goodness of fit of the maximum likelihood solution under the hypothesis represented by the fixed parameters is tested by a large samplex
2 test based on the likelihood ratio technique. A by-product of the procedure is an estimate of the variance-covariance matrix of the estimated parameters. From this, approximate confidence intervals for the parameters can be obtained. Several examples illustrating the usefulness of the procedure are given.This work was supported by a grant (NSF-GB 1985) from the National Science Foundation to Educational Testing Service. 相似文献
33.
34.
Lennart Sjöberg 《Attention, perception & psychophysics》1966,1(3):131-136
Two techniques for studying judgment are discussed. In the first of these one assumes invariance of perception over different judgment processes and conceives of the properties of one judgment process as known. Then, perceptions may be estimated under this process and utilized in the study of other judgment processes of interest. A second technique disposes of the reliance up on a basic, “known” process and instead suggests that perception be treated as free parameters to be estimated from data. The paper then proceeds to show how this second technique may be used under certain conditions on perception themselves. A concept of sensation is introduced which is thought of as generating percepts in formally the same manner as percepts are thought of as generating judgments. The idea is tried out on the perception of movement time. A simple perception process appears to give a good fit to data. 相似文献
35.
Olle Hellström 《Theoretical medicine and bioethics》1993,14(4):325-342
One of my main points in this study is that the knowledge of orthodox medical theory is an incomplete guide for practical action when relating to our patients' specifically human problems. By following a holistic perspective on patients' health and on our medical enterprise we will be more efficient as doctors. This standpoint is illuminated by means of two case reports. Instead of focusing on symptoms as such and letting them refer to orthodox medical theory, I explicitly relate to the patients as if they are conveying a personal meaning by means of experienced symptoms. The experience of illness could be a successful strategy on the existential level although destructive on the technical biological level. A holistic theory of health can give doctors a good conceptual base when relating to people whose presented illnesses are to be regarded explicitly as their way of making themselves understood. The doctor's understanding of the patient's illness, of the theory of health, and of how health is regained, is dependent on the doctor's having the courage to reduce the distance to the patient, the courage to participate and be changed. 相似文献
36.
37.
This study was based on data from a longitudinal research program. The cohort consisted of 874 normal children in an entire school grade in a Swedish community. The aim of the study was to investigate the relation between birth weight and behavior at school, for all children and for each sex separately. The results identified specific aspects of behaviour disorder significantly related to low birth weight (LBW) for children at the age of 10 but not at the age of 13. When the sexes were separated, there were no relations between birth weight and deviant behaviour for boys of low birth weight as compared to boys of normal birth weight, while girls of low birth weight showed specific behavioural disorders at age 10 as compared to girls of normal birth weight. For girls reared in families of low parental socioeconomic status, aggressiveness and motor restlessness at age 10 but not at age 13 was also present. Further analyses showed that girls born small-for-gestational age showed lack of school motivation and concentration difficulties both at age 10 and age 13. 相似文献
38.
Proponents of the projection strategy take an epistemic rule for the evaluation of English conditionals, the Ramsey test, as clue to the truth-conditional semantics of conditionals. They also construe English conditionals as stronger than the material conditional. Given plausible assumptions, however, the Ramsey test induces the semantics of the material conditional. The alleged link between Ramsey test and truth conditions stronger than those of the material conditional can be saved by construing conditionals as ternary, rather than binary, propositional functions with a hidden contextual parameter. But such a ternary construal raises problems of its own. 相似文献
39.
Lars Nyberg Ulrich Olofsson John M. Gardiner Lars-Göran Nilsson 《Psychological research》1997,59(4):231-239
The purpose of this study was to assess retrieval strategy in incidental, intentional, and inclusion tests with word-fragment cues following a levels-of-processing manipulation at study. The results of Exp. 1 showed small levels-of-processing effects in incidental tests, and most subjects reported involuntary rather than voluntary retrieval of study-list words. In an intentional test, although levels of processing had a much greater effect, quite a few subjects also reported involuntary rather than voluntary retrieval of study-list words, and these subjects showed a smaller effect of levels of processing than subjects reporting voluntary retrieval. These results suggest that subjects given instructions for both voluntary and involuntary retrieval of study-list words in an inclusion test might not in fact attempt voluntary retrieval at all, but simply adopt an involuntary retrieval strategy. The results of Exp. 2 provided evidence to support this suggestion. The general implication is that where test contamination refers to subjects' failure to use retrieval strategies in accordance with test instructions, inclusion tests can be contaminated, as well as incidental or intentional tests, and that it is always necessary to obtain converging evidence about the actual strategies subjects use. 相似文献
40.