全文获取类型
收费全文 | 47339篇 |
免费 | 962篇 |
国内免费 | 12篇 |
专业分类
48313篇 |
出版年
2019年 | 285篇 |
2018年 | 3796篇 |
2017年 | 3159篇 |
2016年 | 2631篇 |
2015年 | 478篇 |
2014年 | 474篇 |
2013年 | 2246篇 |
2012年 | 1270篇 |
2011年 | 3158篇 |
2010年 | 2951篇 |
2009年 | 1947篇 |
2008年 | 2341篇 |
2007年 | 2836篇 |
2006年 | 648篇 |
2005年 | 789篇 |
2004年 | 743篇 |
2003年 | 644篇 |
2002年 | 678篇 |
2001年 | 828篇 |
2000年 | 854篇 |
1999年 | 629篇 |
1998年 | 361篇 |
1997年 | 332篇 |
1993年 | 294篇 |
1992年 | 539篇 |
1991年 | 472篇 |
1990年 | 509篇 |
1989年 | 482篇 |
1988年 | 458篇 |
1987年 | 467篇 |
1986年 | 465篇 |
1985年 | 477篇 |
1984年 | 409篇 |
1983年 | 373篇 |
1982年 | 324篇 |
1981年 | 287篇 |
1979年 | 460篇 |
1978年 | 374篇 |
1977年 | 344篇 |
1976年 | 303篇 |
1975年 | 434篇 |
1974年 | 450篇 |
1973年 | 409篇 |
1972年 | 376篇 |
1971年 | 335篇 |
1970年 | 305篇 |
1969年 | 348篇 |
1968年 | 387篇 |
1967年 | 348篇 |
1966年 | 354篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
841.
Biotinidase deficiency is the primary biochemical defect in late-onset multiple carboxylase deficiency and an autosomal recessive disorder and characterized by seizures, ataxia, alopecia and skin rash. We describe a colorimetric semiquantitative method for screening for biotinidase activity from dried samples of whole blood spotted on filter papers. The administration of biotin to affected children can be a lifesaving procedure and can prevent irreversible neurologic damage. 相似文献
842.
G Mladek M L?ffler P Nickel 《Psychiatrie, Neurologie, und medizinische Psychologie》1990,42(6):356-363
In forensic psychology, recommendations that courts request when granting one of the parents the right of child upbringing after a divorce pose a problem for the person who is required to give such expert judgment. The authors describe the difficult situation he faces when having to decide for and, at the same time, against one of the parents. A good knowledge of family psychology and pathopsychology is essential, and for drawing up the expertise and stating his reasons, the expert requires methodical resources. The authors describe four procedures of relational diagnosis and recommend the combined use of these in conjunction with methods that have been employed so far. 相似文献
843.
Recent developments with the Rorschach invite research concerning cognitive and coping styles of learning disabled students. This study, based on an N of 25 (12 learning disabled and 13 controls), was designed to assess group differences in perceptual accuracy, self-concept, and reactivity. Analysis showed that learning disabled students represent a diverse population for which highly individualized understanding is required if appropriate schooling strategies are to be devised. Such students, compared with controls, were more inclined to have lower self-confidence, to be more reactive, to avoid emotionally-laden stimuli, to manifest a higher proportion of responses involving perceptual inaccuracies, and to be less spontaneous and less inclined to take risks. Some curricular implications of the findings are discussed. 相似文献
844.
A comprehensive, multidimensional scale measuring job satisfaction was constructed for use in a major project concerned with personnel recruitment and retention of health professionals. 11 dimensions relating to opinions of immediate supervisors, physical working conditions, satisfaction with coworkers and with pay, aspects related to promotion and work motivation, are identified. These dimensions are shown to distinguish among health professionals on sex and between locations and different occupations. The scale also has high internal validity, producing a multiple R of .78 with over-all job satisfaction. 相似文献
845.
Measures of concurrent validity and alternate-form reliability of the Test of Nonverbal Intelligence
The subjects, 60 undergraduate students, were administered the Test of Nonverbal Intelligence (TONI) individually. The Shipley Institute of Living Scale was administered in small groups. A Pearson correlation of .56 was obtained for TONI Quotients, Forms A and B. TONI Quotients, Forms A and B, correlated with Shipley estimated WAIS--R IQ .50 and .46, respectively, and correlated to .71 and .64, with Shipley Total T scores, .52 and .44, respectively (corrected to .71 and .61), with Shipley Abstraction T scores, .51 and .42, respectively (corrected, .63 and .52), and with Shipley Vocabulary T scores .26 and .32, respectively (corrected to .63 and .52). TONI scores seem more closely related to Shipley Total and Abstraction scores than to Shipley Vocabulary. 相似文献
846.
In a comparison of religious and nonreligious psychotherapists' perceptions of a portion of a psychotherapeutic session no significant differences were found on the Vanderbilt Psychotherapy Process Scale for four groups of therapists designated according to their scores on three religious questionnaires. While the results suggest attitudes toward religion are not reflected in therapists' practice of psychotherapy, limitations of the study indicate the need for more rigorous testing of this possibility. 相似文献
847.
William Gradner 《Psychometrika》1990,55(2):263-275
Markov chains are probabilistic models for sequences of categorical events, with applications throughout scientific psychology. This paper provides a method for anlayzing data consisting of event sequences and covariate observations. It is assumed that each sequence is a Markov process characterized by a distinct transition probability matrix. The objective is to use the covariate data to explain differences between individuals in the transition probability matrices characterizing their sequential data. The elements of the transition probability matrices are written as functions of a vector of latent variables, with variation in the latent variables explained through a multivariate regression on the covariates. The regression is estimated using the EM algorithm, and requires the numerical calculation of a multivariate integral. An example using simulated cognitive developmental data is presented, which shows that the estimation of individual variation in the parameters of a probability model may have substantial theoretical importance, even when individual differences are not the focus of the investigator's concerns.Research contributing to this article was supported by B.R.S. Subgrant 5-35345 from the University of Virginia. I thank the DADA Group, Bill Fabricius, Don Hartmann, William Griffin, Jack McArdle, Ivo Molenaar, Ronald Schoenberg, Simon Tavaré, and several anonymous reviewers for their discussion of these points. 相似文献
848.
The Priestley duality for Wajsberg algebras 总被引:1,自引:1,他引:0
N. G. Martínez 《Studia Logica》1990,49(1):31-46
The Priestley duality for Wajsberg algebras is developed. The Wajsberg space is a De Morgan space endowed with a family of functions that are obtained in rather natural way.As a first application of this duality, a theorem about unicity of the structure is given. 相似文献
849.
Rodger Beehler 《Studies in Philosophy and Education》1990,10(4):315-335
The essay examines the argument advanced by E.D. Hirsch, Jr., for instituting ‘cultural literacy’ as a fundamental priority of schools. A number of confusions and equivocations in Hirsch's reasoning are identified, and the propensity of his project to indoctrinate is exposed. Among the features of Hirsch's argument shown to be troubling are his shifting construal of ‘language’, his inconsistency about the requirements of cultural literacy, and his uncritical relation to traditional images of the American past and present. The upshot is to raise the question why Hirsch's project has elicited wide support and praise. 相似文献
850.