全文获取类型
收费全文 | 174篇 |
免费 | 19篇 |
专业分类
193篇 |
出版年
2022年 | 2篇 |
2021年 | 2篇 |
2020年 | 12篇 |
2019年 | 7篇 |
2018年 | 16篇 |
2017年 | 13篇 |
2016年 | 8篇 |
2015年 | 11篇 |
2014年 | 6篇 |
2013年 | 20篇 |
2012年 | 8篇 |
2011年 | 15篇 |
2010年 | 8篇 |
2009年 | 4篇 |
2008年 | 11篇 |
2007年 | 7篇 |
2006年 | 9篇 |
2005年 | 2篇 |
2004年 | 6篇 |
2003年 | 3篇 |
2002年 | 6篇 |
2000年 | 1篇 |
1999年 | 2篇 |
1997年 | 1篇 |
1994年 | 1篇 |
1990年 | 2篇 |
1989年 | 2篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1981年 | 1篇 |
1978年 | 1篇 |
1977年 | 2篇 |
1976年 | 1篇 |
排序方式: 共有193条查询结果,搜索用时 15 毫秒
91.
92.
This paper describes a photoelectric-helicoidal spirometer that has been designed in our laboratory. It includes a cylindrical helix (or turbine) partitioned in each of its blades by means of opaque plates transversally disposed. These plates obstruct the ray of light emitted by a diode, preventing it from reaching a photoreceptor located at the opposite side of the turbine. These basic elements are located in a module that can be adjusted to a mask that covers nostrils and mouth. Control software for this device is also described. The software facilitates a graphical representation of respiratory activity, as well as its storage in the computer. Software has been designed to be adaptable to any digital-to-analog converter. Both the device and the software have several advantages over traditional spirometers, as well as other nonspirometric techniques for studying respiratory activity. 相似文献
93.
Most Americans are sorted into social networks that are largely politically homogeneous. A large body of political science research has explored the behavioral implications of being embedded in a politically homogeneous or heterogeneous network, but substantially less attention has been given to explaining why some people find themselves in politically homogeneous or heterogeneous social networks. In this article, we explore the psychological and physiological underpinnings of political network homogeneity. We use social network data from an original survey of 129 undergraduates paired with lab experimental evidence that measures individuals' physiological reactivity to an anticipated political discussion. Using our original survey and a separate nationally representative survey, we find suggestive evidence that individuals who are more socially anxious are more likely to share partisanship with their social network ties. Moreover, we find that individuals who experienced a greater increase in heart rate when anticipating a political discussion were more likely to be in homogeneous discussion networks, but we do not find a relationship between electrodermal activity and network homogeneity. Aversion to psychological and physiological discomfort induced by political discussions could contribute to social polarization in the American public. 相似文献
94.
The aim of this paper is to describe Dewey’s reception in the Spanish-speaking countries that constitute the Hispanic world.
Without any doubt, it can be said that in the past century Spain and the countries of South America have been a world apart,
lagging far behind the mainstream Western world. It includes a number of names and facts about the early translation of Dewey’s
works in Spain, Chile, Cuba, Mexico and Argentina in the first half of the century and a brief explanation of the decline
of Dewey in the second half. To a great extent, Dewey’s conception of education was immersed in the international movement
of reform that started at the turn of the century and would eventually slowly but surely, renovate the structure of the educational
system throughout the entire century, including that of South America. But it is equally clear that the Spanish-speaking countries
have displayed a general ignorance of Dewey and, by extension, of American pragmatism during most of the century. In spite
of mutual incomprehension, a deep affinity between Dewey’s pragmatism and Hispanic philosophy is suggested in this paper,
anticipating that the gradual process of democratization of Spain and the Hispanic countries of South America may be in some
sense related to the rediscovery of Dewey and to the application of his key ideas in education. After decades of neglect of
Dewey and of his contribution, there is a strong feeling not only that his conception of things is important to understand
the last century but that Dewey – along with Peirce and other American classical pragmatists – may very well prove to be a
key thinker for the XXIst century also in the Hispanic world. Along this vein, the recent resurgence of pragmatism can be
understood not as the latest academic fashion but the occasion to start to close the gap between the two worlds. 相似文献
95.
Linh C. Dang Gregory R. Samanez-Larkin Jaime J. Castrellon Scott F. Perkins Ronald L. Cowan David H. Zald 《Cognitive, affective & behavioral neuroscience》2018,18(4):739-747
Reward valuation, which underlies all value-based decision-making, has been associated with dopamine function in many studies of nonhuman animals, but there is relatively less direct evidence for an association in humans. Here, we measured dopamine D2 receptor (DRD2) availability in vivo in humans to examine relations between individual differences in dopamine receptor availability and neural activity associated with a measure of reward valuation, expected value (i.e., the product of reward magnitude and the probability of obtaining the reward). Fourteen healthy adult subjects underwent PET with [18F]fallypride, a radiotracer with strong affinity for DRD2, and fMRI (on a separate day) while performing a reward valuation task. [18F]fallypride binding potential, reflecting DRD2 availability, in the midbrain correlated positively with neural activity associated with expected value, specifically in the left ventral striatum/caudate. The present results provide in vivo evidence from humans showing midbrain dopamine characteristics are associated with reward valuation. 相似文献
96.
In this paper we present a case of "word-meaning deafness," characterised by serious problems in the comprehension of spoken language, whilst repetition and writing words and non-words from dictation are preserved. This performance indicates the impossibility of correctly accessing phonological representation from the semantic representation of words. Neuropsychological evidence on specific alterations in word-meaning disorders is scarce, and this study contributes new findings with a Spanish-speaking patient. The nature of the processes involved in understanding language and the cerebral mechanisms that might be affected in each case were discussed, in accordance with current neuropsychological theories. 相似文献
97.
An interface circuit to connect a microphone to an Apple Macintosh computer is described. The Apple Macintosh mouse port is used as the input port, and the microphone activation simulates a mouse press. 相似文献
98.
99.
This study aimed to evaluate the robustness of the linear mixed model, with the Kenward-Roger correction for degrees of freedom, when implemented in SAS PROC MIXED, using split-plot designs with small sample sizes. A Monte Carlo simulation design involving three groups and four repeated measures was used, assuming an unstructured covariance matrix to generate the data. The study variables were: sphericity, with epsilon values of 0.75 and 0.57; group sizes, equal or unequal; and shape of the distribution. As regards the latter, non-normal distributions were introduced, combining different values of kurtosis in each group. In the case of unbalanced designs, the effect of pairing (positive or negative) the degree of kurtosis with group size was also analysed. The results show that the Kenward-Roger procedure is liberal, particularly for the interaction effect, under certain conditions in which normality is violated. The relationship between the values of kurtosis in the groups and the pairing of kurtosis with group size are found to be relevant variables to take into account when applying this procedure. 相似文献
100.
Souza GG Pereira MG Vila J Oliveira L Volchan E 《The Spanish journal of psychology》2012,15(1):237-243
Affiliative stimuli are pleasant and highly biologically relevant. Affiliative cues are thought to elicit a prosocial predisposition. Here affiliative and neutral pictures were exposed prior to a reaction time task which consisted in responding to a visual target. Half the participants responded with finger-flexion, a movement frequently involved in prosocial activities. The other half responded with finger extension, a less prosocially compatible movement. Results showed that under the exposure to affiliative pictures, as compared to neutral ones, participants who used finger flexion were faster, while those using finger extension were slower. Performance benefits to the task, when flexing the finger, together with performance costs, when extending it, indicate the relevance of movement compatibility to the context. These findings put forward a possible link between affiliative primers and motor preparation to facilitate a repertoire of movements related to prosocial predispositions including finger flexion. 相似文献