全文获取类型
收费全文 | 4861篇 |
免费 | 70篇 |
专业分类
4931篇 |
出版年
2024年 | 43篇 |
2023年 | 63篇 |
2022年 | 67篇 |
2021年 | 105篇 |
2020年 | 147篇 |
2019年 | 122篇 |
2018年 | 231篇 |
2017年 | 235篇 |
2016年 | 199篇 |
2015年 | 125篇 |
2014年 | 168篇 |
2013年 | 670篇 |
2012年 | 350篇 |
2011年 | 331篇 |
2010年 | 199篇 |
2009年 | 123篇 |
2008年 | 297篇 |
2007年 | 241篇 |
2006年 | 196篇 |
2005年 | 123篇 |
2004年 | 103篇 |
2003年 | 109篇 |
2002年 | 87篇 |
2001年 | 43篇 |
2000年 | 70篇 |
1999年 | 43篇 |
1998年 | 37篇 |
1997年 | 23篇 |
1996年 | 23篇 |
1995年 | 18篇 |
1994年 | 27篇 |
1993年 | 17篇 |
1992年 | 14篇 |
1991年 | 34篇 |
1990年 | 19篇 |
1989年 | 19篇 |
1988年 | 16篇 |
1987年 | 16篇 |
1986年 | 10篇 |
1985年 | 14篇 |
1984年 | 13篇 |
1983年 | 9篇 |
1981年 | 8篇 |
1980年 | 8篇 |
1979年 | 12篇 |
1977年 | 8篇 |
1975年 | 9篇 |
1968年 | 11篇 |
1966年 | 9篇 |
1965年 | 8篇 |
排序方式: 共有4931条查询结果,搜索用时 15 毫秒
151.
Sillero Quintana M Refoyo Román I Lorenzo Calvo A Sampedro Molinuevo J 《Perceptual and motor skills》2007,104(2):547-561
A simple method was designed to evaluate visual abilities such as disance visual acuity, binocular horizontal visual field, simple and choice visual reaction times, and stereoscopic vision in skilled 11- to 13-yr.-old basketball players participating in a 15-day summer training camp. On a test battery, visual abilities were monitored in 473 players of the Spanish Basketball Federation over a 5-yr. period. The players showed outstanding scores on distance visual acuity and stereoscopic vision, and good visual reaction times and horizontal visual fields. When scores were compared by sex and age, significant differences on certain visual measures were observed. Many layers showed crossed eye-hand dominance. Visual screening programs may help promote visual health among junior basketball players and could be used for performance training. 相似文献
152.
Causal judgment is assumed to play a central role in prediction, control, and explanation. Here, we consider the function
or functions that map contingency information concerning the relationship between a single cue and a single outcome onto causal
judgments. We evaluate normative accounts of causal induction and report the findings of an extensive meta-analysis in which
we used a cross-validation model-fitting method and carried out a qualitative analysis of experimental trends in order to
compare a number of alternative models. The best model to emerge from this competition is one in which judgments are based
on the difference between the amount of confirming and disconfirming evidence. A rational justification for the use of this
model is proposed. 相似文献
153.
Ráez M 《Journal of personality assessment》2007,89(Z1):S119-S123
This study is composed of 233 adult nonpatients, all from Peru. Inclusion/exclusion criteria are described. Interrater reliability statistics at the response level are presented along with scores for the Rorschach Comprehensive System (CS; Exner & Erdberg, 2005). Considering the results of this investigation, the researcher suggests a line of multicultural research. The differences between the United States and Peru strengthen the psychometric and qualitative value of this line of investigation. 相似文献
154.
The present work sets out to study the internal structure of the Torrance Test of Creative Thinking (TTCT) and to establish standardised scores that will enable the test to be used in both a diagnostic and educational context. 649 students (319 girls and 330 boys), aged 5 to 12 years from various schools in Murcia and Alicante (SE Spain), took part in the study. The findings suggest that the psychometric characteristics of TTCT are satisfactory, and its internal structure can be attributed to three factors that are responsible for a high percentage of the variance (73.8%). The standardised score tables, which are provided for first time in this context, will be useful in the evaluation of creativity and the identification of students with high intellectual abilities. 相似文献
155.
Systems biology is the rapidly growing and heavily funded successor science to genomics. Its mission is to integrate extensive bodies of molecular data into a detailed mathematical understanding of all life processes, with an ultimate view to their prediction and control. Despite its high profile and widespread practice, there has so far been almost no bioethical attention paid to systems biology and its potential social consequences. We outline some of systems biology's most important socioethical issues by contrasting the concept of systems as dynamic processes against the common static interpretation of genomes. New issues arise around systems biology's capacities for in silico testing, changing cultural understandings of life, synthetic biology, and commercialization. We advocate an interdisciplinary and interactive approach that integrates social and philosophical analysis and engages closely with the science. Overall, we argue that systems biology socioethics could stimulate new ways of thinking about socioethical studies of life sciences. 相似文献
156.
This paper analyzes the modulator role of job involvement in the relationship between stress and job satisfaction, using the OSI (Occupational Stress Indicator) model. For this purpose, we analyzed: six sources of stress, the OSI job satisfaction results, and a job involvement scale. The sample consisted of 779 professional soldiers from the Spanish Army. The results show that when the levels of the two dimensions job involvement (psychological identification and job-related feelings of duty-obligation are high, stress due to achievements and career development and social relationships will have no influence on job satisfaction. However, we found higher job satisfaction, even when stress is high, in those situations where psychological identification is low and job-related feelings of duty-obligation are high. 相似文献
157.
158.
Whereas the unique axes properties of PARAFAC1 have been examined extensively, little is known about uniqueness properties
for the PARAFAC2 model for covariance matrices. This paper is concerned with uniqueness in the rank two case of PARAFAC2.
For this case, Harshman and Lundy have recently shown, subject to mild assumptions, that PARAFAC2 is unique when five (covariance)
matrices are analyzed. In the present paper, this result is sharpened. PARAFAC2 is shown to be usually unique with four matrices.
With three matrices it is not unique unless a certain additional assumption is introduced. If, for instance, the diagonal
matrices of weights are constrained to be non-negative, three matrices are enough to have uniqueness in the rank two case
of PARAFAC2.
The authors are obliged to Richard Harshman for stimulating this research, and to the Associate Editor and reviewers for suggesting
major improvements in the presentation. 相似文献
159.
René A. De Wijk Wim Vaessen Johannes Heidema E. P. Köster 《Behavior research methods》1996,28(3):383-391
An injection olfactometer for human psychophysical experiments is described. The olfactometer is capable of presenting, either mono- or birhinally, single odorants and binary mixtures. The pulse form of the olfactory stimulus at the exit of the olfactometer approaches a rectangular form, which makes the olfactometer well suited for olfactory reaction time measurements. Since stimulation periods are independent of the subject’s inhalation, time-intensity measurements over prolonged periods of time are possible as well. In the second part of this paper, a new technique is described for the measurement of the stimulus pulse form at the exit of the olfactometer. 相似文献
160.