全文获取类型
收费全文 | 56333篇 |
免费 | 2363篇 |
国内免费 | 21篇 |
专业分类
58717篇 |
出版年
2020年 | 695篇 |
2019年 | 820篇 |
2018年 | 1153篇 |
2017年 | 1162篇 |
2016年 | 1216篇 |
2015年 | 872篇 |
2014年 | 1054篇 |
2013年 | 4915篇 |
2012年 | 1951篇 |
2011年 | 1967篇 |
2010年 | 1177篇 |
2009年 | 1197篇 |
2008年 | 1685篇 |
2007年 | 1657篇 |
2006年 | 1510篇 |
2005年 | 1252篇 |
2004年 | 1309篇 |
2003年 | 1238篇 |
2002年 | 1178篇 |
2001年 | 1933篇 |
2000年 | 1805篇 |
1999年 | 1349篇 |
1998年 | 624篇 |
1997年 | 534篇 |
1996年 | 610篇 |
1995年 | 552篇 |
1994年 | 543篇 |
1993年 | 528篇 |
1992年 | 1107篇 |
1991年 | 1019篇 |
1990年 | 996篇 |
1989年 | 958篇 |
1988年 | 936篇 |
1987年 | 864篇 |
1986年 | 857篇 |
1985年 | 905篇 |
1984年 | 729篇 |
1983年 | 629篇 |
1979年 | 760篇 |
1978年 | 562篇 |
1975年 | 601篇 |
1974年 | 679篇 |
1973年 | 702篇 |
1972年 | 604篇 |
1971年 | 563篇 |
1970年 | 483篇 |
1969年 | 479篇 |
1968年 | 609篇 |
1967年 | 530篇 |
1966年 | 509篇 |
排序方式: 共有10000条查询结果,搜索用时 8 毫秒
131.
S Martin K Housley H Mccoy P Greenhouse F Stigger M A Kenney S Shoffner V Fu M Korslund F G Ercanli-Huffman 《Perceptual and motor skills》1988,67(3):879-884
The Rosenberg Self-esteem Scale was administered to 550 14- and 16-yr.-old (+/- 6 mo.) girls. Self-esteem scores were categorized by weight and weight by height. Scores on the Quetelet Index for obesity were correlated with self-esteem scores. Mean self-esteem of the low- and middle-weight by height group was significantly higher than the mean of the high-weight by height group. In analyzing weight alone, the self-esteem of the middle-weight group was significantly higher than the self-esteem of the high-weight group. The correlation of the obesity index and self-esteem indicated that as weight increased self-esteem decreased. 相似文献
132.
133.
134.
135.
136.
137.
138.
LISE M. SAARI TERRY R. JOHNSON STEVEN D. MCLAUGHLIN DENISE M. ZIMMERLE 《Personnel Psychology》1988,41(4):731-743
A survey was systematically developed to assess issues related to management training and education, and it was sent to 1,000 randomly selected U.S. companies with at least 1,000 employees. Based on a 61% response rate, findings were obtained regarding issues such as needs assessment, management training and development approaches, reasons for selecting particular programs, characteristics of participants, how decisions are made regarding who will participate, preparation and follow-up of participants, evaluation of management training programs, future management training trends, and needed training content. Significant findings by company size and industry type also are reported. 相似文献
139.
Jos M. F. ten Berge 《Psychometrika》1988,53(4):487-494
Van de Geer has reviewed various criteria for transforming two or more matrices to maximal agreement, subject to orthogonality constraints. The criteria have applications in the context of matching factor or configuration matrices and in the context of canonical correlation analysis for two or more matrices. The present paper summarizes and gives a unified treatment of fully general computational solutions for two of these criteria, Maxbet and Maxdiff. These solutions will be shown to encompass various well-known methods as special cases. It will be argued that the Maxdiff solution should be preferred to the Maxbet solution whenever the two criteria coincide. Horst's Maxcor method will be shown to lack the property of monotone convergence. Finally, simultaneous and successive versions of the Maxbet and Maxdiff solutions will be treated as special cases of a fully flexible approach where the columns of the rotation matrices are obtained in successive blocks.The author is obliged to Henk Kiers for computational assistance and helpful comments. 相似文献
140.
M. W. Bunder 《Studia Logica》1988,47(2):129-143
In the early thirties, Church developed predicate calculus within a system based on lambda calculus. Rosser and Kleene developed Arithmetic within this system, but using a Godelization technique showed the system to be inconsistent.Alternative systems to that of Church have been developed, but so far more complex definitions of the natural numbers have had to be used. The present paper based on a system of illative combinatory logic developed previously by the author, does allow the use of the Church numerals. Given a new definition of equality all the Peano-type axioms of Mendelson except one can be derived. A rather weak extra axiom allows the proof of the remaining Peano axiom. Note. The illative combinatory logic used in this paper is similar to the logic employed in computer languages such as ML.The author wishes to thank Dr. Roger Hindley for proofreading this paper and for making some useful suggestions. This paper was presented at the 1986 Annual Conference of the Australasian Association of Logic in Auckland, 9–12 July, 1986. 相似文献