全文获取类型
收费全文 | 787篇 |
免费 | 30篇 |
专业分类
817篇 |
出版年
2023年 | 6篇 |
2021年 | 4篇 |
2020年 | 13篇 |
2019年 | 15篇 |
2018年 | 20篇 |
2017年 | 31篇 |
2016年 | 22篇 |
2015年 | 16篇 |
2014年 | 19篇 |
2013年 | 87篇 |
2012年 | 23篇 |
2011年 | 28篇 |
2010年 | 30篇 |
2009年 | 26篇 |
2008年 | 31篇 |
2007年 | 32篇 |
2006年 | 25篇 |
2005年 | 24篇 |
2004年 | 21篇 |
2003年 | 25篇 |
2002年 | 34篇 |
2001年 | 12篇 |
2000年 | 29篇 |
1999年 | 26篇 |
1998年 | 12篇 |
1997年 | 10篇 |
1996年 | 11篇 |
1995年 | 14篇 |
1994年 | 9篇 |
1993年 | 6篇 |
1992年 | 4篇 |
1991年 | 6篇 |
1990年 | 5篇 |
1989年 | 4篇 |
1988年 | 9篇 |
1985年 | 7篇 |
1983年 | 8篇 |
1982年 | 5篇 |
1980年 | 7篇 |
1979年 | 5篇 |
1978年 | 12篇 |
1977年 | 8篇 |
1975年 | 5篇 |
1974年 | 8篇 |
1973年 | 4篇 |
1969年 | 3篇 |
1968年 | 4篇 |
1967年 | 8篇 |
1966年 | 3篇 |
1963年 | 3篇 |
排序方式: 共有817条查询结果,搜索用时 0 毫秒
171.
This paper is concerned with the geometric properties of dissimilarity coefficients defined on finite sets and especially with their Euclidean nature. We present several particular transformations which preserve Euclideanarity and we complete, through the study of a one-parameter family, the current knowledge of the metric and Euclidean structure of coefficients based on binary data. These results are directly deduced from two theorems which prove the positive semi-definite status of some quadratic forms which play a large role in some definitions of dissimilarity commonly used.The authors wish to thank B. Fichet for his helpful suggestions, the associate Editor and an anonymous reviewer for comments and highly constructive criticisms on earlier drafts of the paper. 相似文献
172.
Alan J. Dubinsky Francis J. Yammarino Marvin A. Jolson 《Journal of business and psychology》1995,9(3):315-335
Recent research in organizational behavior has found that transformational leadership can engender improved employee work outcomes in many types of organizations. Personal characteristics of transformational leaders, however, have not been thoroughly investigated. This paper reports the findings of a study that explored relationships between personal characteristics and dimensions of transformational leadership using sales managers as the population of interest. Findings suggest that a reconceptualization of the proposed linkages may be necessary. Potential explanations for the results obtained are presented along with managerial and research implications.The authors gratefully acknowledge the host company for its participation in the study. 相似文献
173.
Francis Cailliez 《Psychometrika》1983,48(2):305-308
Ifd is a measure of dissimilarity on a finite set withn elements, the smallest positive constantc* such thatd +c has an euclidean representation for allc ≥c* is shown to be the largest eigen-value of a matrix of size 2n. 相似文献
174.
Francis Jeffry Pelletier 《Synthese》1975,31(3-4):523-526
175.
176.
177.
G W Barlow R C Francis 《Journal of comparative psychology (Washington, D.C. : 1983)》1988,102(2):118-123
Adults of the Midas cichlid (Cichlasoma citrinellum) are predominantly normal-colored (N) morphs, although 8% in nature are gold (G) morphs. They tend to mate assortatively by color; that behavior may be influenced by prior experience with parents or siblings or by their own color. A previous experiment indicated that juveniles respond according to a rule that they avoid and behave defensively toward G juveniles and that they consort with and behave aggressively toward N juveniles (Barlow & Siri, 1987). The fear-provoking effect of G may have interfered with more subtle aspects of choice because the 4 treatment fish in each group reacted through the glass barrier to the approach of the subject. In the present experiment such feedback was eliminated by using one-way mirrors. N juveniles reared by normal parents (N X N) differentiated between N and G treatment fish only in that they attacked significantly more toward G; thus their behavior was contrary to that predicted by the fear-provoking effect of gold. The notable effect among juveniles reared by G parents (G X G) was that N spent more time with N and avoided G treatment fish, in keeping with the fear-provoking effect of gold. The results are discussed in terms of the differences in experiences between juveniles reared N X N, all of which were themselves N, and those reared G X G, consisting of both color morphs. Despite the differences in the two experiments, the main conclusion remains in place: Affiliative responses of juveniles, as measured in these tests, do not predict choice of mate among adults. 相似文献
178.
Twelve field-dependent (FD) and 12 field-independent (FI) males were administered 260 trials of a signal detection task in four phases. Signal type (auditory, visual, or no signal) was crossed with four sets of imaging treatments (pure visual representations, pure sounds without visual counterparts, and two sets representing sounds with visual counterparts). Detection of a signal in isolation was 90% accurate, as was the detection of no signal while imaging. Cross-modality imaging interfered with detection of the stimulus but to a significantly lesser extent than did same-modality imaging. In all detection/imaging treatments, FIs were significantly more sensitive to the signal than were FDs; however, FDs and FIs did not differ in accuracy of detecting isolated signals. The results are discussed in terms of the commonalities shared by perception and imaging as they appear in the Perky effect and cognitive style. 相似文献
179.
Frequency of attack in shock-elicited aggression as a function of the performance of individual rats 下载免费PDF全文
D. A. Powell J. Francis M. J. Braman N. Schneiderman 《Journal of the experimental analysis of behavior》1969,12(5):817-823
Fighting rates between paired rats were investigated as a function of the probability of attack by a single animal. Animals from stable high-fighting and low-fighting frequency pairs were intermatched to detect individual high-fighting and low-fighting rats. Pairs of high-fighting animals then received saline or different chlorpromazine dosages during successive sessions. Finally, single high-fighting members of each pair also received the different drug dosages. The chief findings were that: (a) rats showing high fighting rates when matched against each other revealed low fighting rates when matched against one, but not the other member of a low-fighting pair; and (b) high-fighting rats decreased their fighting rates as their own or their opponent's chlorpromazine dosage increased. These results indicated that a low rate of fighting on the part of one rat results in a low fighting rate on the part of its opponent. 相似文献
180.
Francis M. Forster 《Integrative psychological & behavioral science》1969,4(2):103-114
Studies of conditional reflex therapy for patients with sensory-evoked epilepsy are reviewed and experimental studies in animals reported. The behavioral methods employed in the therapy are reviewed. They are of a conditioning nature and are defined as clinical therapeutic conditioning. Sensory-evoked epilepsy can be induced in animals by conditioning techniques, provided the animal brain has been rendered epileptogenic. Sensory-evoked epilepsy in patients can be made worse by conditioning, and can be changed from one type to another. However, sensory-evoked seizures in humans are not the result of conditional reflexes. 相似文献