全文获取类型
收费全文 | 2381篇 |
免费 | 79篇 |
国内免费 | 33篇 |
专业分类
电工技术 | 28篇 |
综合类 | 100篇 |
化学工业 | 130篇 |
金属工艺 | 26篇 |
机械仪表 | 86篇 |
建筑科学 | 28篇 |
矿业工程 | 7篇 |
能源动力 | 63篇 |
轻工业 | 10篇 |
水利工程 | 10篇 |
石油天然气 | 2篇 |
武器工业 | 1篇 |
无线电 | 131篇 |
一般工业技术 | 128篇 |
冶金工业 | 28篇 |
原子能技术 | 9篇 |
自动化技术 | 1706篇 |
出版年
2022年 | 9篇 |
2021年 | 10篇 |
2020年 | 26篇 |
2019年 | 27篇 |
2018年 | 26篇 |
2017年 | 44篇 |
2016年 | 48篇 |
2015年 | 49篇 |
2014年 | 104篇 |
2013年 | 101篇 |
2012年 | 100篇 |
2011年 | 139篇 |
2010年 | 95篇 |
2009年 | 133篇 |
2008年 | 130篇 |
2007年 | 115篇 |
2006年 | 128篇 |
2005年 | 104篇 |
2004年 | 89篇 |
2003年 | 95篇 |
2002年 | 82篇 |
2001年 | 46篇 |
2000年 | 57篇 |
1999年 | 53篇 |
1998年 | 46篇 |
1997年 | 58篇 |
1996年 | 38篇 |
1995年 | 35篇 |
1994年 | 59篇 |
1993年 | 35篇 |
1992年 | 25篇 |
1991年 | 32篇 |
1990年 | 14篇 |
1989年 | 22篇 |
1988年 | 20篇 |
1987年 | 12篇 |
1986年 | 10篇 |
1985年 | 29篇 |
1984年 | 19篇 |
1983年 | 32篇 |
1982年 | 28篇 |
1981年 | 23篇 |
1980年 | 12篇 |
1979年 | 30篇 |
1978年 | 23篇 |
1977年 | 15篇 |
1976年 | 22篇 |
1975年 | 13篇 |
1974年 | 6篇 |
1973年 | 8篇 |
排序方式: 共有2493条查询结果,搜索用时 125 毫秒
1.
Dimitris Papadias M.Sc. Ph.D. candidate Timos Sellis Ph.D. 《The VLDB Journal The International Journal on Very Large Data Bases》1994,3(4):479-516
Various relation-based systems, concerned with the qualitative representation and processing of spatial knowledge, have been developed in numerous application domains. In this article, we identify the common concepts underlying qualitative spatial knowledge representation, we compare the representational properties of the different systems, and we outline the computational tasks involved in relation-based spatial information processing. We also describesymbolic spatial indexes, relation-based structures that combine several ideas in spatial knowledge representation. A symbolic spatial index is an array that preserves only a set of spatial relations among distinct objects in an image, called the modeling space; the index array discards information, such as shape and size of objects, and irrelevant spatial relations. The construction of a symbolic spatial index from an input image can be thought of as a transformation that keeps only a set of representative points needed to define the relations of the modeling space. By keeping the relative arrangements of the representative points in symbolic spatial indexes and discarding all other points, we maintain enough information to answer queries regarding the spatial relations of the modeling space without the need to access the initial image or an object database. Symbolic spatial indexes can be used to solve problems involving route planning, composition of spatial relations, and update operations. 相似文献
2.
3.
We consider a language of operations which pass parameters by means of a stack. An algebra over the set of type signatures is introduced, which allows the type signature of a program to be obtained from the type signatures of its constituent operations.Although the theories apply in principle to any stack based language, they have been evolved with particular regard to the proposed ANSI Standard Forth language, which is currently implemented in a type free manner. We hope this work will stimulate an interest in Forth amongst those applying algebraic techniques in software engineering, and we hope to lay the theoretical foundations for implementing practical type checkers to support Forth. 相似文献
4.
Giulio Croce Paola Dagaro Carlo Nonino 《International Journal of Heat and Mass Transfer》2007,50(25-26):5249-5259
5.
Motivated by a study of similar problems stated for factors of words, we study forbidden subwords of a language or a word. A procedure for obtaining the set of all words avoiding a given set of subwords is presented. On the other hand, an algorithm for computing the set of minimal forbidden subwords for a word is given. The case of a two-letter alphabet appears to be particularly interesting and it is considered separately. 相似文献
6.
Cezar Câmpeanu 《Information Processing Letters》2004,92(6):267-274
We define the pattern expressions as an extension of both regular expressions and patterns. We prove several properties of the new family of languages, similar to those of extended regex languages [Câmpeanu et al., Int. J. Found. Comput. Sci. 14 (6) (2003) 1007-1018]. We also define an automata system that recognizes these languages. Differences between regex and pattern expressions are also discussed. 相似文献
7.
Gennaro Costagliola Vincenzo Deufemia Filomena Ferrucci Carmine Gravino 《Information and Computation》2003,187(2):209-245
Drawn symbolic pictures are an extension of drawn pictures obtained by associating a symbol from an alphabet to each point of the picture. In the paper we will address some new interesting issues derived from the introduction of the symbols and we will identify the conditions, which ensure the preservation of properties holding for drawn pictures in the setting of the proposed extension. 相似文献
8.
The goal of the PMS project is to produce an environment in which the intelligent online assessment of the design for large-scale ADA programming projects is provided. The focus is on the representation of knowledge about the design process for an individual module. Changes in pseudocode complexity are measured in terms of partial metrics. These metrics can take the designers inferences about the pseudocode program structure into account when assessing module complexity. Next, a model of the stepwise refinement process is given which demonstrates how pseudocode elaboration decisions can be modelled in partial metric terms. Finally, the decisions associated with each refinement step for 17 example refinements taken from the computer science literature are described using partial metrics. 相似文献
9.
This paper presents the main current theoretical issues in Information Retrieval. The principles of conceptual modelling, as they have emerged in the database area, are presented and their application to document modelling in order to enhance document retrieval is discussed. Finally, the main features of the MULTOS project are presented and critically reviewed confronting them with the requirements which have been identified during the general discussion on document conceptual modelling for information retrieval. 相似文献
10.
本文将等效介电常数近似分析方法在应用范围和处理方法上进行了一些改进.发展为双等效介电常数近似分析法,然后用它来分析矩形介质波导阵列.推得两个一维周期的耦合特征方程。如果将Macatili方法应用范围扩展用来研究该波导阵列也会得到同样的结果,它们都能在二维平面上较准确地反应出通带和阻带等主要周期特性。 相似文献