全文获取类型
收费全文 | 12600篇 |
免费 | 180篇 |
国内免费 | 1篇 |
专业分类
12781篇 |
出版年
2023年 | 68篇 |
2022年 | 67篇 |
2021年 | 126篇 |
2020年 | 225篇 |
2019年 | 258篇 |
2018年 | 335篇 |
2017年 | 311篇 |
2016年 | 382篇 |
2015年 | 256篇 |
2014年 | 340篇 |
2013年 | 1326篇 |
2012年 | 574篇 |
2011年 | 565篇 |
2010年 | 418篇 |
2009年 | 420篇 |
2008年 | 588篇 |
2007年 | 568篇 |
2006年 | 508篇 |
2005年 | 433篇 |
2004年 | 467篇 |
2003年 | 428篇 |
2002年 | 415篇 |
2001年 | 180篇 |
2000年 | 197篇 |
1999年 | 186篇 |
1998年 | 193篇 |
1997年 | 160篇 |
1996年 | 108篇 |
1995年 | 150篇 |
1994年 | 146篇 |
1993年 | 134篇 |
1992年 | 125篇 |
1991年 | 117篇 |
1990年 | 109篇 |
1989年 | 112篇 |
1988年 | 111篇 |
1987年 | 108篇 |
1986年 | 85篇 |
1985年 | 104篇 |
1984年 | 119篇 |
1983年 | 98篇 |
1982年 | 114篇 |
1981年 | 119篇 |
1980年 | 107篇 |
1979年 | 102篇 |
1978年 | 112篇 |
1977年 | 89篇 |
1976年 | 93篇 |
1975年 | 64篇 |
1974年 | 77篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
221.
Michael Smith 《The Journal of Ethics》2006,10(1-2):75-106
I take issue with two suggestions of Joel Feinberg's: first, that it is incoherent to suppose that human life as such is absurd,
and, second, that a particular human life may be absurd and yet saved from being tragic by being fulfilled. I also argue that
human life as such may well be absurd and I consider various responses to this. 相似文献
222.
Two studies examined the effects of dispositional self-consciousness on reactance. In Experiment 1, men who were high in private self-consciousness displayed greater reactance responses to a coercive communication attempt (as reflected by attitude reversal) than did men lower in private self-consciousness. In contrast, the effect of public self-consciousness in this context was to inhibit the expression of reactance. In Experiment 2, women high in private self-consciousness exhibited greater reactance responses to a self-imposed threat to their freedom of choice (as reflected by equivocation over two choice alternatives) than did women lower in private self-consciousness. The effect of public self-consciousness in this context was negligible. These findings replicate and extend a previous self-awareness and reactance finding; they provide additional evidence that manipulated self-awareness and dispositional self-consciousness converge on the same psychological entity; and they provide additional evidence that there are important differences between the dimensions of private and public self-consciousness. 相似文献
223.
224.
Michael Katz 《Studia Logica》1981,40(3):209-225
The logic of inexactness, presented in this paper, is a version of the Łukasiewicz logic with predicates valued in [0, ∞).
We axiomatize multi-valued models of equality and ordering in this logic guaranteeing their imbeddibility in the real line.
Our axioms of equality and ordering, when interpreted as axioms of proximity and dominance, can be applied to the foundations
of measurement (especially in the social sciences). In two-valued logic they provide theories of ratio scale measurement.
In multivalued logic they enable us to treat formally errors arising in nominal and ordinal measurements. 相似文献
225.
Michael S. Fanselow 《Learning and motivation》1981,12(4):398-419
Previous research has shown that pretreating rats with the opiate antagonist naloxone increases the freezing that follows painful electric shock. Three experiments, using freezing behavior as a dependent variable, were carried out to determine whether the drug might cause this effect by enhancing fear conditioning. Two of the studies employed a differential context fear-conditioning paradigm. Naloxone did not affect freezing behavior during the preshock adaptation period. In Experiment 1, naloxone was found to increase resistance to extinction in the S+ context. In Experiment 2, naloxone was found to increase freezing in the S+ context. This effect was dependent upon administering naloxone during training but not dependent on administering it during testing. The third study employed a generalization paradigm. It was found that naloxone's effect on postshock freezing was dependent on the place of testing; as the contextual cues of the test chamber were changed from those of the conditioning chamber, the effect of naloxone on freezing was reduced. The results of these experiments lend strong support to the hypothesis that naloxone increases freezing by enhancing the conditioning of fear to contextual stimuli associated with shock. 相似文献
226.
227.
My purpose in this paper is to argue that the classical notion of entailment is not suitable for non-bivalent logics, to propose an appropriate alternative and to suggest a generalized entailment notion suitable to bivalent and non-bivalent logics alike. In classical two valued logic, one can not infer a false statement from one that is not false, any more than one can infer from a true statement a statement that is not true. In classical logic in fact preserving truth and preserving non-falsity are one and the same thing. They are not the same in non-bivalent logics however and I will argue that the classical notion of entailment that preserves only truth is not strong enough for such a logic. I will show that if we retain the classical notion of entailment in a logic that has three values, true, false and a third value in between, an inconsistency can be derived that can be resolved only by measures that seriously disable the logic. I will show this for a logic designed to allow for semantic presuppositions, then I will show that we get the same result in any three valued logic with the same value ordering. I will finally suggest how the notion of entailment should be generalized so that this problem may be avoided. The strengthened notion of entailment I am proposing is a conservative extension of the classical notion that preserves not only truth but the order of all values in a logic, so that the value of an entailed statement must alway be at least as great as the value of the sequence of statements entailing it. A notion of entailment this strong or stronger will, I believe, be found to be applicable to non-classical logics generally. In the opinion of Dana Scott, no really workable three valued logic has yet been developed. It is hard to disagree with this. A workable three valued logic however could perhaps be developed however, if we had a notion of entailment suitable to non-bivalent logics. 相似文献
228.
Use of cosmetic surgeries has increased steadily over the last decade, and continues to rise in young and old alike. The purpose of present research was to investigate the relationship of personality to use of cosmetic procedures of various kinds. It was expected that adult attachment style, in particular attachment anxiety, would be positively related to use of cosmetic procedures. Attachment anxiety involves excessive approval seeking and concern over achieving and maintaining the love of significant others (such as romantic relationship partners). Such concerns could, in turn, lead to use of a variety of strategies for maintaining positive regard, including cosmetic surgeries to enhance physical appearance. Results supported this hypothesis, particularly among women. Neuroticism was also related to some procedures, though the relationships were generally weaker than those for attachment anxiety, and largely disappeared in regression analyses that controlled for the separate influence of the two variables. 相似文献
229.
230.
Choosing the history of statistics and operations research as a casestudy, several ways of setting the development of 20th century appliedmathematics into a social context are discussed. It is shown that there isample common ground between these contextualizations and several recent research programs in general contemporary history. It is argued that a closer cooperation between general historians and historians ofmathematics might further the integration of the internalist andexternalist approaches within the historiography of mathematics. 相似文献