全文获取类型
收费全文 | 25340篇 |
免费 | 309篇 |
国内免费 | 46篇 |
出版年
2023年 | 64篇 |
2022年 | 89篇 |
2021年 | 118篇 |
2020年 | 159篇 |
2019年 | 145篇 |
2018年 | 3653篇 |
2017年 | 2980篇 |
2016年 | 2421篇 |
2015年 | 346篇 |
2014年 | 246篇 |
2013年 | 809篇 |
2012年 | 953篇 |
2011年 | 2727篇 |
2010年 | 2727篇 |
2009年 | 1621篇 |
2008年 | 1985篇 |
2007年 | 2409篇 |
2006年 | 259篇 |
2005年 | 429篇 |
2004年 | 286篇 |
2003年 | 238篇 |
2002年 | 182篇 |
2001年 | 85篇 |
2000年 | 131篇 |
1999年 | 60篇 |
1998年 | 48篇 |
1997年 | 34篇 |
1996年 | 32篇 |
1995年 | 20篇 |
1994年 | 16篇 |
1993年 | 17篇 |
1992年 | 31篇 |
1991年 | 22篇 |
1990年 | 35篇 |
1989年 | 23篇 |
1988年 | 27篇 |
1987年 | 17篇 |
1986年 | 10篇 |
1985年 | 13篇 |
1984年 | 18篇 |
1983年 | 13篇 |
1979年 | 16篇 |
1978年 | 11篇 |
1976年 | 14篇 |
1974年 | 11篇 |
1971年 | 11篇 |
1970年 | 10篇 |
1969年 | 10篇 |
1968年 | 11篇 |
1965年 | 10篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
Mart Fehér 《国际科学哲学研究》1990,4(3):229-240
The role accorded to the public by scientists and philosophers of science has undergone an essential historical change in the last three centuries. Public participation in (witnessing of) scientific experiments was considered an important requirement for 17th century experimenters (e.g. for Boyle or Pascal). The cognitive role played by lay persons was later substantially downgraded; witnessing went out of fashion, while science became more and more esoteric and a matter for experts only. Part of this process was that all scientific disciplines became intensively compartmentalized and in consequence a rather puzzling or even paradoxical situation appeared: that the scientists themselves were and are being reduced epistemically to the status of lay persons, outside of their proper field of expertise (as was pointed out by J. Hardwig). The paper deals with some cognitive aspects of this historical process. 相似文献
72.
73.
74.
75.
Jörg R. J. Schirra 《Kognitionswissenschaft》1997,6(4):177-195
How can we explain that an assertion on something perceived can be understood in the same manner by somebody who cannot perceive that scene? This problem bases the interest in computational linguistics in how listener modeling could possibly be harmonized with reference semantics. Mental images substituting real perception appear as a way out. The architecture of the listener model has to be adapted to the creation and use of such pictorial data structures. Furthermore, the relation between the latter and a verbal (i. e., propositional) representation must be understood. The resulting architecture of a listener model with reference semantics can be employed to solve communicational problems from three general classes in a better way, as is demonstrated by an example implementation. 相似文献
76.
77.
78.
79.
Rajeev Goré 《Studia Logica》1994,53(3):433-457
We present sound, (weakly) complete and cut-free tableau systems for the propositional normal modal logicsS4.3, S4.3.1 andS4.14. When the modality is given a temporal interpretation, these logics respectively model time as a linear dense sequence of points; as a linear discrete sequence of points; and as a branching tree where each branch is a linear discrete sequence of points.Although cut-free, the last two systems do not possess the subformula property. But for any given finite set of formulaeX the superformulae involved are always bounded by a finite set of formulaeX*
L depending only onX and the logicL. Thus each system gives a nondeterministic decision procedure for the logic in question. The completeness proofs yield deterministic decision procedures for each logic because each proof is constructive.Each tableau system has a cut-free sequent analogue proving that Gentzen's cut-elimination theorem holds for these latter systems. The techniques are due to Hintikka and Rautenberg.Presented byDov M. Gabbay 相似文献
80.
Michael von Grunau Stéphane Dubé Cesar Galera 《Attention, perception & psychophysics》1994,55(5):575-592
Effects of the similarity between target and distractors in a visual search task were investigated in several experiments. Both familiar (numerals and letters) and unfamiliar (connected figures in a 5 × 5 matrix) stimuli were used. The observer had to report on the presence or absence of a target among a variable number of homogeneous distractors as fast and as accurately as possible. It was found that physical difference had the same clear effect on processing time far familiar and for unfamiliar stimuli: processing time decreased monotonically with increasing physical difference. Distractors unrelated to the target and those related to the target by a simple transformation (180° rotation, horizontal or vertical reflection) were also compared, while the physical difference was kept constant. For familiar stimuli, transformational relatedness increased processing time in comparison with that fort unrelated stimulus pairs. It was further shown in a scaling experiment that this effect could be accounted for by the amount of perceived similarity of the target-distractor pairs. For unfamiliar stimuli, transformational relatedness did have a smaller and less pronounced effect. Various comparable unrelated distractors resulted in a full range of processing times. Results from a similarity scaling experiment correlated well with the outcome of the experiments with unfamiliar stimuli. These results are interpreted in terms of an underlying continuum of perceived similarity as the basis of the speed of visual search, rather than a dichotomy of parallel versus serial processing. 相似文献