全文获取类型
收费全文 | 1003篇 |
免费 | 11篇 |
国内免费 | 31篇 |
专业分类
系统科学 | 80篇 |
丛书文集 | 19篇 |
教育与普及 | 9篇 |
理论与方法论 | 4篇 |
现状及发展 | 40篇 |
综合类 | 893篇 |
出版年
2024年 | 6篇 |
2023年 | 7篇 |
2022年 | 6篇 |
2021年 | 6篇 |
2020年 | 10篇 |
2019年 | 8篇 |
2018年 | 9篇 |
2017年 | 10篇 |
2016年 | 15篇 |
2015年 | 15篇 |
2014年 | 62篇 |
2013年 | 45篇 |
2012年 | 56篇 |
2011年 | 73篇 |
2010年 | 68篇 |
2009年 | 63篇 |
2008年 | 60篇 |
2007年 | 55篇 |
2006年 | 36篇 |
2005年 | 45篇 |
2004年 | 35篇 |
2003年 | 44篇 |
2002年 | 24篇 |
2001年 | 22篇 |
2000年 | 21篇 |
1999年 | 24篇 |
1998年 | 27篇 |
1997年 | 26篇 |
1996年 | 30篇 |
1995年 | 17篇 |
1994年 | 21篇 |
1993年 | 11篇 |
1992年 | 7篇 |
1991年 | 12篇 |
1990年 | 21篇 |
1989年 | 10篇 |
1988年 | 23篇 |
1987年 | 10篇 |
1986年 | 3篇 |
1985年 | 1篇 |
1983年 | 1篇 |
排序方式: 共有1045条查询结果,搜索用时 812 毫秒
31.
Inferentialists about scientific representation hold that an apparatus's representing a target system consists in the apparatus allowing “surrogative inferences” about the target. I argue that a serious problem for inferentialism arises from the fact that many scientific theories and models contain internal inconsistencies. Inferentialism, left unamended, implies that inconsistent scientific models have unlimited representational power, since an inconsistency permits any conclusion to be inferred. I consider a number of ways that inferentialists can respond to this challenge before suggesting my own solution. I develop an analogy to exploitable glitches in a game. Even though inconsistent representational apparatuses may in some sense allow for contradictions to be generated within them, doing so violates the intended function of the apparatus's parts and hence violates representational “gameplay”. 相似文献
32.
Luca Mari Paolo Carbone Alessandro Giordani Dario Petri 《Studies in history and philosophy of science》2017
Measurement is widely applied because its results are assumed to be more reliable than opinions and guesses, but this reliability is sometimes justified in a stereotyped way. After a critical analysis of such stereotypes, a structural characterization of measurement is proposed, as partly empirical and partly theoretical process, by showing that it is in fact the structure of the process that guarantees the reliability of its results. On this basis the role and the structure of background knowledge in measurement and the justification of the conditions of object-relatedness (“objectivity”) and subject-independence (“intersubjectivity”) of measurement are specifically discussed. 相似文献
33.
34.
This paper discusses a crisis of accountability that arises when scientific collaborations are massively epistemically distributed. We argue that social models of epistemic collaboration, which are social analogs to what Patrick Suppes called a “model of the experiment,” must play a role in creating accountability in these contexts. We also argue that these social models must accommodate the fact that the various agents in a collaborative project often have ineliminable, messy, and conflicting interests and values; any story about accountability in a massively distributed collaboration must therefore involve models of such interests and values and their methodological and epistemic effects. 相似文献
35.
本文阐明了对普通物理实施双语教学的重要性。对普通物理双语教学过程中各个环节进行了探索和实践,期望进一步推进我院双语教学的步伐和改善双语教学模式。 相似文献
36.
牛雅莉 《科技情报开发与经济》2011,21(33):142-143
介绍了《电力职工教育培训》杂志的历史和面临的严峻发展形势,提出了破解《电力职工教育培训》发展瓶颈的有效举措。 相似文献
37.
38.
张隆辉 《哈尔滨师范大学自然科学学报》2011,27(1):9-11
设f:A→B是映射,任意C∈2^A,令f1(C)=f(C),任意D∈2^B,令f2(D)=f^-1(D),则称f1,f2是f的导出映射.研究了单射、满射、双射(及其逆)、映射的积的导出映射,并得到了相应的结果. 相似文献
39.
基于PSRT的大连豆粕期货价格的混沌判据 总被引:2,自引:0,他引:2
通过相空间重构技术,对大连豆粕期货价格增长率的时间序列分别进行相空间重构,应用Wolf方法得出最大的Lyapunov指数,从而给出系统混沌存在的证据;利用关联函数求出关联维度和Kolmogorov熵,从而给出对系统的混沌程度的估计和对大连豆粕期货价格进行有效性预测的时间尺度. 相似文献
40.
A conventional wisdom about the progress of physics holds that successive theories wholly encompass the domains of their predecessors through a process that is often called “reduction.” While certain influential accounts of inter-theory reduction in physics take reduction to require a single “global” derivation of one theory׳s laws from those of another, I show that global reductions are not available in all cases where the conventional wisdom requires reduction to hold. However, I argue that a weaker “local” form of reduction, which defines reduction between theories in terms of a more fundamental notion of reduction between models of a single fixed system, is available in such cases and moreover suffices to uphold the conventional wisdom. To illustrate the sort of fixed-system, inter-model reduction that grounds inter-theoretic reduction on this picture, I specialize to a particular class of cases in which both models are dynamical systems. I show that reduction in these cases is underwritten by a mathematical relationship that follows a certain liberalized construal of Nagel/Schaffner reduction, and support this claim with several examples. Moreover, I show that this broadly Nagelian analysis of inter-model reduction encompasses several cases that are sometimes cited as instances of the “physicist׳s” limit-based notion of reduction. 相似文献