全文获取类型
收费全文 | 24388篇 |
免费 | 4957篇 |
国内免费 | 4244篇 |
学科分类
工业技术 | 33589篇 |
出版年
2024年 | 491篇 |
2023年 | 1980篇 |
2022年 | 3116篇 |
2021年 | 3043篇 |
2020年 | 2456篇 |
2019年 | 1644篇 |
2018年 | 1148篇 |
2017年 | 1008篇 |
2016年 | 1046篇 |
2015年 | 1028篇 |
2014年 | 1422篇 |
2013年 | 1230篇 |
2012年 | 1246篇 |
2011年 | 1503篇 |
2010年 | 1236篇 |
2009年 | 1227篇 |
2008年 | 1239篇 |
2007年 | 1124篇 |
2006年 | 958篇 |
2005年 | 892篇 |
2004年 | 692篇 |
2003年 | 584篇 |
2002年 | 535篇 |
2001年 | 401篇 |
2000年 | 343篇 |
1999年 | 283篇 |
1998年 | 268篇 |
1997年 | 221篇 |
1996年 | 184篇 |
1995年 | 148篇 |
1994年 | 114篇 |
1993年 | 112篇 |
1992年 | 93篇 |
1991年 | 45篇 |
1990年 | 47篇 |
1989年 | 45篇 |
1988年 | 29篇 |
1987年 | 27篇 |
1986年 | 41篇 |
1966年 | 14篇 |
1965年 | 24篇 |
1964年 | 25篇 |
1963年 | 23篇 |
1961年 | 17篇 |
1960年 | 12篇 |
1959年 | 15篇 |
1958年 | 16篇 |
1957年 | 22篇 |
1956年 | 13篇 |
1955年 | 23篇 |
排序方式: 共有10000条查询结果,搜索用时 125 毫秒
91.
The influence of Arnheim's work on the author's research began with an experiment on the perception of visual balance. Two later research projects emerged from the profound influence of Arnheim's stance toward creation in the visual arts as a serious, cognitive endeavor. A series of meta-analyses were first conducted to test the claim that learning in the arts transfers to nonarts cognitive domains, but little evidence was found. Past research on the transfer hypothesis was found to be lacking because of its failure to assess learning in the parent domain. Therefore, a new research project was carried out to identify kinds of learning in the parent domain of visual arts. We identified eight thinking dispositions developed in serious visual arts classes, setting the stage for more plausible transfer studies. This study demonstrates that the visual arts inculcate basic skills in perception and cognition that exist both in the arts and sciences. All of the skills the authors describe can, with some modification, be transferred to the science laboratory. As Rudolf Arnheim has taught us, visual thinking is everywhere. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
92.
Replies to the comments by R. A. R. Gurung (see record 2003-03405-011) and J. Li (see record 2003-03405-012) regarding comments on the article by R. G. Tweed and D. R. Lehman (2001) which stated that a Confucian-Socratic framework provides a structure for analyzing culture-influenced aspects of academic learning. In this article, Tweed and Lehman argued that these ancient exemplars model approaches to learning continue to differentiate students within a modern Canadian postsecondary context. In this reply, Tweed and Lehman advise caution in how Gurung placed their Confucian-Socratic framework within the context of prior theory on education and epistemological development because these models were developed exclusively in the West. Furthermore, Tweed and Lehman believe that Li's argument misinterpreted their article, and that they should of consistently used the term "personal reform" rather than "behavioral reform" in order to communicate the depth of personal change envisioned by Confucius. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
93.
Colzato Lorenza S.; Raffone Antonino; Hommel Bernhard 《Canadian Metallurgical Quarterly》2006,32(3):705
Four experiments were conducted to investigate the relationship between the binding of visual features (as measured by their aftereffects on subsequent binding) and the learning of feature-conjunction probabilities. Both binding and learning effects were obtained, but they did not interact. Interestingly, (shape-color) binding effects disappeared with increasing practice, presumably because of the fact that only 1 of the features involved was relevant to the task. However, this instability was only observed for arbitrary, not highly overlearned combinations of simple geometric features and not for real objects (colored pictures of a banana and strawberry), where binding effects were strong and resistant to practice. These findings suggest that learning has no direct impact on the strength or resistance of bindings or on speed with which features are bound; however, learning does affect the amount of attention particular feature dimensions attract, which again can influence which features are considered in binding. (PsycINFO Database Record (c) 2011 APA, all rights reserved) 相似文献
94.
最优特征子集选择问题 总被引:73,自引:0,他引:73
机器学习和模式识别面临的一个重要问题,就是特征子集的选择问题,即从一个大的已生征特集合,选择一个子集合来一致地描述已知例。特别,最优特征子集选择问题,即最小的特征子集问题的 计算杂性至今学不清楚。 相似文献
95.
The Design of Discrimination Experiments 总被引:1,自引:0,他引:1
Experimentation plays a fundamental role in scientific discovery. Scientists experiment to gather data, investigate phenomena, measure quantities, and test theories. In this article, we address the problem of designing experiments to discriminate between two completing theories. Given an initial situation for which the two theories make the same prediction, the experiment design problem is to determine how to modify the situation such that the two theories make different predictions for the modified situation. The modified situation is called a discrimination experiment. We present a knowledge-intensive method called DEED for designing discrimination experiments. The method analyzes the differences in the two theories' explanations of the prediction for the initial situation. Based on this analysis, it determines modifications to the initial situation that will result in a discrimination experiment. We illustrate the method with the design of experiments to discriminate between several pairs of qualitative theories in the fluids domain. 相似文献
96.
We present our machine learning system, that uses inductive logic programming techniques to learn how to identify transmembrane
domains from amino acid sequences. Our system facilitates the use of operators such as ‘contains’, that act on entire sequences,
rather than on individual elements of a sequence. The prediction accuracy of our new system is around 93%, and this compares
favourably with earlier results.
This work was carried out with the support of a research grant from ISIS, Fujitsu Laboratories. 相似文献
97.
本文对示例式学习的ID5R算法进行了深入的研究并作了进一步的改进,提高了其计算效率.并提出一种适合于增量式学习的抗干扰机制,拓广了算法的适用范围. 相似文献
98.
99.
In executing classical plans in the real world, small discrepancies between a planner's internal representations and the real world are unavoidable. These can conspire to cause real-world failures even though the planner is sound and, therefore, proves that a sequence of actions achieves the goal. Permissive planning, a machine learning extension to classical planning, is one response to this difficulty. This paper describes the permissive planning approach and presents GRASPER, a permissive planning robotic system that learns to robustly pick up novel objects. 相似文献
100.
Locally Weighted Learning 总被引:22,自引:0,他引:22
Christopher G. Atkeson Andrew W. Moore Stefan Schaal 《Artificial Intelligence Review》1997,11(1-5):11-73
This paper surveys locally weighted learning, a form of lazy learning and memory-based learning, and focuses on locally weighted linear regression. The survey discusses distance functions, smoothing parameters, weighting functions, local model structures, regularization of the estimates and bias, assessing predictions, handling noisy data and outliers, improving the quality of predictions by tuning fit parameters, interference between old and new data, implementing locally weighted learning efficiently, and applications of locally weighted learning. A companion paper surveys how locally weighted learning can be used in robot learning and control. 相似文献