全文获取类型
收费全文 | 21878篇 |
免费 | 1874篇 |
国内免费 | 1222篇 |
专业分类
24974篇 |
出版年
2024年 | 53篇 |
2023年 | 398篇 |
2022年 | 322篇 |
2021年 | 385篇 |
2020年 | 832篇 |
2019年 | 848篇 |
2018年 | 811篇 |
2017年 | 935篇 |
2016年 | 889篇 |
2015年 | 592篇 |
2014年 | 793篇 |
2013年 | 2460篇 |
2012年 | 461篇 |
2011年 | 638篇 |
2010年 | 530篇 |
2009年 | 792篇 |
2008年 | 1003篇 |
2007年 | 1056篇 |
2006年 | 1012篇 |
2005年 | 863篇 |
2004年 | 755篇 |
2003年 | 631篇 |
2002年 | 554篇 |
2001年 | 363篇 |
2000年 | 321篇 |
1999年 | 298篇 |
1998年 | 240篇 |
1997年 | 196篇 |
1996年 | 161篇 |
1995年 | 144篇 |
1994年 | 131篇 |
1993年 | 113篇 |
1992年 | 91篇 |
1991年 | 58篇 |
1990年 | 59篇 |
1989年 | 43篇 |
1988年 | 51篇 |
1985年 | 413篇 |
1984年 | 460篇 |
1983年 | 369篇 |
1982年 | 464篇 |
1981年 | 451篇 |
1980年 | 454篇 |
1979年 | 416篇 |
1978年 | 474篇 |
1977年 | 371篇 |
1976年 | 363篇 |
1975年 | 276篇 |
1974年 | 281篇 |
1973年 | 238篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
261.
This paper investigates partitions of lattices of modal logics based on superintuitionistic logics which are defined by forming, for each superintuitionistic logic L and classical modal logic , the set L[] of L-companions of . Here L[] consists of those modal logics whose non-modal fragments coincide with L and which axiomatize if the law of excluded middle p V p is added. Questions addressed are, for instance, whether there exist logics with the disjunction property in L[], whether L[] contains a smallest element, and whether L[] contains lower covers of . Positive solutions as concerns the last question show that there are (uncountably many) superclean modal logics based on intuitionistic logic in the sense of Vakarelov [28]. Thus a number of problems stated in [28] are solved. As a technical tool the paper develops the splitting technique for lattices of modal logics based on superintuitionistic logics and ap plies duality theory from [34]. 相似文献
262.
Pavel Materna 《Studia Logica》1997,59(3):331-343
Propositional and notional attitudes are construed as relations (-in-intension) between individuals and constructions (rather than propositrions etc,). The apparatus of transparent intensional logic (Tichy) is applied to derive two rules that make it possible to export existential quantifiers without conceiving attitudes as relations to expressions (sententialism). 相似文献
263.
A similarity relation is a reflexive and symmetric binary relation between objects. Similarity is relative: it depends on the set of properties of objects used in determining their similarity or dissimilarity. A multi-modal logical language for reasoning about relative similarities is presented. The modalities correspond semantically to the upper and lower approximations of a set of objects by similarity relations corresponding to all subsets of a given set of properties of objects. A complete deduction system for the language is presented. 相似文献
264.
医学伦理学概念之探究 总被引:5,自引:1,他引:4
丛亚丽 《医学与哲学(人文社会医学版)》1997,18(12):637-640
医学伦理学的概念看起来很简单,一般情况下人们便习以为常地接受了作为应用规范伦理学的一个分支的科学地位,而忽视了医学对医学伦理学所起的作用。本文认为:医学伦理学的具体内容是医学科技与伦理道德两因素相互作用的产物,对其相互作用的形式和产物的具体分析和总结便可构成这门学科的理论体系。 相似文献
265.
6 15岁儿童对友谊特性的认知发展 总被引:10,自引:0,他引:10
研究目的:(1)考察我国儿童、青少年的友谊特性的认知发展规律和特点;(2)探讨儿童友谊特性的认知结构。研究采用结构访谈法,被试为来自北京市普通幼儿园、小学和中学的6岁、8岁、10岁、12岁和15岁儿童共100名(每个年龄组20名,男女各半)。结果发现:(1)6—15岁儿童对友谊特性的认知结构由5个维度组成,即:个人交流和冲突解决,榜样和竞争,互相欣赏,共同活动和互相帮助,亲密交往。(2)对6—15岁儿童,友谊特性中的5个维度的重要性次序为:共同活动和互相帮助,个人交流和冲突解决,榜样和竞争,互相欣赏,亲密交往。(3)从发展上来看,对友谊特性不同维度的认知发展趋势有很大年龄差异。6—8岁儿童只能认识到友谊特性中一些外在的、行为的特征;以后才能逐渐认识到那些内在的、情感性的特征。但是,原来那些外在的特征并没有随着儿童年龄的增长而被取代,而是与内在的、情感性的特性结合在一起,在认识中逐渐深化。(4)小学六年级儿童在共同活动和游戏上表现出性别差异(男生高于女生);而在冲突解决上,女生的认知水平高于男生。此外,初中三年级学生在互相欣赏方面,男生的认识水平高于女生 相似文献
266.
William Grassie 《Zygon》1997,32(3):415-421
This essay is a discussion of effective teaching in the science-and-religion classroom. I begin by introducing Alfred North Whitehead's three stages of learning—romance, discipline, and generalization—and consider their implications for powerful pedagogy in science and religion. Following Whitehead's three principles, I develop a number of additional heuristics that deal with active, visual, narrative, cooperative, and dialogical learning styles. Finally, I present twelve guidelines for how to use e-mail and class-based listserves to achieve some of these outcomes. 相似文献
267.
268.
Anna Case-Winters 《Zygon》1997,32(3):351-375
Both science and theology have lately faced a crisis of authority. Their shared realization of the extent to which knowledge is underdetermined by the data and socially constructed provides a kind of common ground for reconsideration of their respective methods of inquiry as well as of the status of the claims they have warrant to make. Both fields are now consciously and critically employing a models approach. This article proposes criteria for assessing models and applies the criteria to one model from each field. The model of understanding evolution as a struggle for existence is considered from the field of science, and the traditional model for understanding the God-world relation as that of a king's relation to his kingdom is considered from the field of theology. Each of these models is evaluated with respect to its credibility, religious viability, and moral adequacy. In each case an alternative analogy is proposed and argued for. 相似文献
269.
From antiquity to the present, humans have debated whether intelligent life exists elsewhere in the universe. This presentation will survey this debate, examining the roles played in it by science, religion, philosophy, and other areas of human learning. One thesis that will be developed is that whether or not extraterrestrials exist, ideas about them have strongly influenced Western thought. 相似文献
270.
Gregory R. Peterson 《Zygon》1997,32(2):189-206
Does God have a mind? Western theism has traditionally construed God as an intentional agent who acts on creation and in relation to humankind. God loves, punishes, and redeems. God's intentionality has traditionally been construed in analogy to human intentionality, which in turn has often presumed a supernatural dualism. Developments in cognitive science, however, render supernatural dualism suspect for explaining the human mind. How, then, can we speak of the mind of God? Borrowing from Daniel Dennett's intentional stance, I suggest that analogical reasoning regarding the mind of God be abandoned in favor of an ontologically agnostic approach that treats God as an intentional system. In this approach, God's purposive action is an explanatory feature of the believer's universe, a real pattern that informs our values and beliefs about the world and our place in it. 相似文献