全文获取类型
收费全文 | 841篇 |
免费 | 161篇 |
国内免费 | 53篇 |
专业分类
1055篇 |
出版年
2025年 | 1篇 |
2024年 | 9篇 |
2023年 | 6篇 |
2022年 | 16篇 |
2021年 | 24篇 |
2020年 | 26篇 |
2019年 | 47篇 |
2018年 | 44篇 |
2017年 | 47篇 |
2016年 | 52篇 |
2015年 | 40篇 |
2014年 | 55篇 |
2013年 | 125篇 |
2012年 | 37篇 |
2011年 | 46篇 |
2010年 | 32篇 |
2009年 | 59篇 |
2008年 | 43篇 |
2007年 | 40篇 |
2006年 | 57篇 |
2005年 | 49篇 |
2004年 | 32篇 |
2003年 | 41篇 |
2002年 | 24篇 |
2001年 | 11篇 |
2000年 | 19篇 |
1999年 | 9篇 |
1998年 | 12篇 |
1997年 | 12篇 |
1996年 | 6篇 |
1995年 | 7篇 |
1994年 | 7篇 |
1993年 | 3篇 |
1992年 | 6篇 |
1991年 | 1篇 |
1990年 | 2篇 |
1989年 | 3篇 |
1987年 | 1篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1979年 | 1篇 |
排序方式: 共有1055条查询结果,搜索用时 0 毫秒
851.
Cervical cancer is the second most common cancer in women globally. A computer aided cervical disease diagnosis system that can relieve pressure on medical experts and save the cost is proposed. To implement our approach in the reality of cervical diseases diagnosis, a multi-modal framework is designed for three kinds of cervical diseases diagnosis that integrates uterine cervix images, Thinprep Cytology Test, human papillomavirus test, and patients’ age. However, too many features increase memory storage costs and computational costs, and it affects the spread of this system in poor areas. Feature selection not only eliminates redundant or irrelevant features but also finds the factors that influence the disease most first is performed in multi-modal frameworks for cervical diseases diagnosis. The detailed process of the method is as follows: first, according the representative color, an efficient image segmentation algorithm is developed; then from three different types of segmented images, we extract color features and texture features for interpreting uterine cervix images; next, Boruta algorithm is applied to feature selection; finally, the performance of Random Forests that utilizes selected features for cervical disease diagnosis is investigated. In the experiment, the proposed multi-modal diagnostic approach gives the final diagnosis for three different kinds of cervical diseases with 83.1% accuracy, which significantly outperforms methods using any single source of information alone. The validation cohort is applied to validate the efficiency of our method, and the performance of random forest obtained by using only 1.2% of features is like or even better than using 100% of features. 相似文献
852.
先述参与者的优势及句子不同成分的可提取性 总被引:6,自引:0,他引:6
考察了复合句中先述参与者在可提取性上的优势及句子连贯性因素对这种优势现象的影响。同时,采用系列一同时呈现的方式,考察了句子不同成分的可提取性。 相似文献
853.
KENNETH JUNGE 《Scandinavian journal of psychology》1994,35(1):16-26
Measurement of diversity is important in several sciences but has evolved mainly within ecology. An ecological community with many species is more diverse than one with few but the way the total number of individuals is distributed among the species also influences the degree of diversity or heterogeneity. Although not always explicitly used, it can be shown that diversity is a concept of some importance in psychology, too. In general terms quantification of diversity is related to the apportionment of some quantity into a number of well-defined classes. The dual-concept type of diversity index reflects both the number of classes and the degree of evenness (homogeneity) of the apportionment. The quantity that is distributed has commonly been a population of elements and apportionment homogeneity measures population heterogeneity. The statistical context has dominated the thinking about the measurement of diversity, heterogeneity, and homogeneity. Some well-known indices of diversity and the ideas behind them are discussed. It is concluded that the general geometric representation of homogeneity (similarity) and heterogeneity (dissimilarity) (Junge, 1978; 1991) offers a more general approach to the measurement of diversity. 相似文献
854.
《Theoria》2018,84(3):242-258
Across a series of seminal works, Ruth Millikan has produced a compelling and comprehensive naturalized account of content. With respect to linguistic meaning, her ground‐breaking approach has been to analyse the meaning of a linguistic term via the function it performs which has been responsible for securing the term's survival. This way of looking at things has significant repercussions for a number of recent debates in philosophy of language. This article explores these repercussions through the lens of what is known as semantic minimalism, using the tenets of minimalism to draw out some questions for Millikan's approach to the semantics/pragmatics divide. 相似文献
855.
Max Kölbel 《Canadian journal of philosophy》2018,48(3-4):379-404
AbstractThe prevailing theoretical framework for theorising about representation construes all representation as involving objective representational contents. This classic framework has tended to drive philosophers either to claim that evaluative judgements are representations and therefore objective, or else to claim that evaluative judgements are not really representations, because they are not objective. However, a more general, already well-explored framework is available, which will allow theorists to treat evaluative judgements as full-fledged representations (thus doing justice to their representational aspects) while leaving open whether they are objective. Such a more general conception of representational content is exemplified, e.g. by Lewis’s ‘centred contents’ and Gibbard’s framework of ‘contents of judgement’, thus it is not new. I shall start in §1 by introducing the more general framework of perspectival contents and then illustrate in §2 how awareness of it can help expose the fallaciousness of certain widely used forms of argumentation in metaethics. 相似文献
856.
857.
Theories and classifications of defence mechanisms are not unified. This study addresses the psychological system as a dissipative structure which exchanges information with the external and internal world. When using defence mechanisms, the cognitive‐affective schema of an individual could remain stable and ordered by excluding psychological entropy, obtaining psychological negentropy or by dissipating the energy of self‐presentation. From this perspective, defences can be classified into three basic types: isolation, compensation and self‐dissipation. However, not every kind of defence mechanisms can actually help the individual. Non‐adaptive defences are just functioning as an effective strategy in the short run but can be a harmful approach in the long run, while adaptive defences could instead help the individual as a long‐term mechanism. Thus, we would like to suggest that it is more useful for the individual to use more adaptive defence mechanisms and seek out social or interpersonal support when undergoing psychic difficulties. As this model of defences is theoretical at present, we therefore aim to support and enrich this viewpoint with empirical evidence. 相似文献
858.
Sophisticated senator and legislative onion. Whether or not you have ever heard of these things, we all have some intuition that one of them makes much less sense than the other. In this paper, we introduce a large dataset of human judgments about novel adjective‐noun phrases. We use these data to test an approach to semantic deviance based on phrase representations derived with compositional distributional semantic methods, that is, methods that derive word meanings from contextual information, and approximate phrase meanings by combining word meanings. We present several simple measures extracted from distributional representations of words and phrases, and we show that they have a significant impact on predicting the acceptability of novel adjective‐noun phrases even when a number of alternative measures classically employed in studies of compound processing and bigram plausibility are taken into account. Our results show that the extent to which an attributive adjective alters the distributional representation of the noun is the most significant factor in modeling the distinction between acceptable and deviant phrases. Our study extends current applications of compositional distributional semantic methods to linguistically and cognitively interesting problems, and it offers a new, quantitatively precise approach to the challenge of predicting when humans will find novel linguistic expressions acceptable and when they will not. 相似文献
859.
860.
AbstractIn their introductory remarks, the guest editors, themselves presenters at the conference “Parent–Infant Disturbance: Theory and Therapy,” introduce the philosophy and methodology underlying this interdisciplinary psychoanalytic conference and outline the multiple dimensions of the issue at hand, as they are addressed by the individual contributions to this volume. The paper concludes with a remembrance of and dedication to the victims of the Paris terrorist attack of November 13, 2015. 相似文献