全文获取类型
收费全文 | 912篇 |
免费 | 21篇 |
国内免费 | 7篇 |
出版年
2021年 | 8篇 |
2020年 | 13篇 |
2019年 | 13篇 |
2018年 | 18篇 |
2017年 | 11篇 |
2016年 | 20篇 |
2014年 | 11篇 |
2013年 | 49篇 |
2012年 | 26篇 |
2011年 | 17篇 |
2010年 | 13篇 |
2009年 | 14篇 |
2008年 | 14篇 |
2007年 | 25篇 |
2006年 | 18篇 |
2005年 | 14篇 |
2004年 | 22篇 |
2003年 | 10篇 |
2002年 | 22篇 |
2001年 | 37篇 |
2000年 | 46篇 |
1999年 | 23篇 |
1998年 | 11篇 |
1997年 | 8篇 |
1992年 | 19篇 |
1991年 | 15篇 |
1990年 | 34篇 |
1989年 | 24篇 |
1988年 | 12篇 |
1987年 | 23篇 |
1986年 | 32篇 |
1985年 | 22篇 |
1984年 | 21篇 |
1983年 | 16篇 |
1982年 | 8篇 |
1981年 | 10篇 |
1980年 | 9篇 |
1979年 | 14篇 |
1978年 | 10篇 |
1976年 | 7篇 |
1975年 | 15篇 |
1974年 | 15篇 |
1973年 | 20篇 |
1972年 | 15篇 |
1971年 | 17篇 |
1970年 | 17篇 |
1969年 | 7篇 |
1968年 | 9篇 |
1967年 | 11篇 |
1951年 | 6篇 |
排序方式: 共有940条查询结果,搜索用时 15 毫秒
791.
792.
In the current literature, empirical and conceptual distinctions have been drawn between a more or less passive short-term memory (STM) system and a more dynamic working memory (WM) system. Distinct tasks have been developed to measure their capacity and research has generally shown that, for adults, WM, and not STM, is a reliable predictor of general cognitive ability. However, the locus of the differences between the tasks has received little attention. We present data from children concerning measures of matrices reasoning ability, reading, and numerical skill along with forward and backward order serial recall of WM, STM, and STM with articulatory suppression tasks. As indices of children's cognitive skills, STM and WM are shown to be rather similar in terms of memory per se. Neither the opportunity for rehearsal nor task complexity provides satisfactory explanations for differences between memory tests. 相似文献
793.
Massed and spaced learning in honeybees: the role of CS, US, the intertrial interval, and the test interval 总被引:2,自引:1,他引:1
下载免费PDF全文
![点击此处可从《Learning & memory (Cold Spring Harbor, N.Y.)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Conditioning the proboscis extension reflex of harnessed honeybees (Apis mellifera) is used to study the effect temporal spacing between successive conditioning trials has on memory. Retention is monitored at two long-term intervals corresponding to early (1 and 2 d after conditioning) and late long-term memory (3 and 4 d). The acquisition level is varied by using different conditioned stimuli (odors, mechanical stimulation, and temperature increase at the antenna), varying strengths of the unconditioned stimulus (sucrose), and various numbers of conditioning trials. How learning trials are spaced is the dominant factor both for acquisition and retention, and although longer intertrial intervals lead to better acquisition and higher retention, the level of acquisition per se does not determine the spacing effect on retention. Rather, spaced conditioning leads to higher memory consolidation both during acquisition and later, between the early and long-term memory phases. These consolidation processes can be selectively inhibited by blocking protein synthesis during acquisition. 相似文献
794.
795.
796.
P. Schall M. Feuerbacher M. Bartsch U. Messerschmidt K. Urban 《Philosophical Magazine Letters》2013,93(10):785-796
Dislocation density studies have been performed on icosahedral Al-Pd-Mn single quasicrystals after plastic deformation and after subsequent heat treatment. The deformation tests were carried out at a constant strain rate of 10- 5 s-1 at temperatures between 695 and 820 C. The heat treatments were performed at 730 C, corresponding to one of the deformation temperatures. The development of the dislocation density during heat treatment and that during plastic deformation are compared. The experimental data are interpreted using a kinetic equation, which describes the evolution of the dislocation density during deformation. Numerical values for the dislocation multiplication constant and the annihilation rate for icosahedral Al-Pd-Mn are presented. 相似文献
797.
We have combined high-angle annular dark field/scanning transmission electron microscopy (HAADF-STEM) tomography with bright field (BF)-TEM tomography to characterize small inclusions of Pb at a grain boundary in Al. It was found that the shape of the grain boundary inclusions is more complex than previously thought. By using moiré fringes observed at some orientations of the specimen in a BF-TEM tomographic tilt series, we were able to determine the orientation of each grain, the axis and angle of misorientation of the grain boundary, and the facet planes of the grain boundary inclusions. The 3D shape of the inclusions was determined by merging this information with the HAADF-STEM tomography. 相似文献
798.
Thaddeus Metz 《South African Journal of Philosophy》2013,32(1):65-72
In an article titled ‘The end of ubuntu’ recently published in this journal, Bernard Matolino and Wenceslaus Kwindingwi argue that contemporary conditions in (South) Africa are such that there is no justification for appealing to an ethic associated with talk of ‘ubuntu’. They argue that political elites who invoke ubuntu do so in ways that serve nefarious functions, such as unreasonably narrowing discourse about how best to live, while the moral ideals of ubuntu are appropriate only for a bygone, pre-modern age. Since there is nothing ethically promising about ubuntu for today's society, and since elite appeals to it serve undesirable purposes there, the authors conclude that ubuntu in academic and political circles ‘has reached its end’. In this article, I respond to Matolino and Kwindingwi, contending that, in fact, we should view scholarly enquiry into, and the political application of, ubuntu as projects that are only now properly getting started. 相似文献
799.
Abir U. Igamberdiev 《World Futures: Journal of General Evolution》2013,69(1-4):571-581
Information processing is a main property which distinguishes life from inorganic matter. Its background is the recognition activity of biomacro‐molecules based on quantum non‐demolition measurements. Reflective arrows in the set of mappings appearing from quantum measurements do form a hypercyclic structure which realizes information transfer and allows a system to self‐reproduce and evolve. These arrows correspond to Goedel numbers created inside a system. 相似文献
800.
V.U. Ludwig C. Stelzel H. Krutiak C.E. Prunkl R. Steimke L.M. Paschke N. Kathmann H. Walter 《Consciousness and cognition》2013,22(2):637-653
Hypnotic responding might be due to attenuated frontal lobe functioning after the hypnotic induction. Little is known about whether personality traits linked with frontal functioning are associated with responsiveness to hypnotic suggestions. We assessed whether hypnotic suggestibility is related to the traits of self-control and impulsivity in 154 participants who completed the Brief Self-Control Scale, the Self-Regulation Scale, the Barratt Impulsiveness Scale (BIS-11), and the Harvard Group Scale of Hypnotic Susceptibility (HGSHS:A). BIS-11 non-planning impulsivity correlated positively with HGSHS:A (Bonferroni-corrected). Furthermore, in the best model emerging from a stepwise multiple regression, both non-planning impulsivity and self-control positively predicted hypnotic suggestibility, and there was an interaction of BIS-11 motor impulsivity with gender. For men only, motor impulsivity tended to predict hypnotic suggestibility. Hypnotic suggestibility is associated with personality traits linked with frontal functioning, and hypnotic responding in men and women might differ. 相似文献