全文获取类型
收费全文 | 1039篇 |
免费 | 137篇 |
国内免费 | 75篇 |
专业分类
电工技术 | 39篇 |
综合类 | 163篇 |
化学工业 | 20篇 |
金属工艺 | 21篇 |
机械仪表 | 76篇 |
建筑科学 | 26篇 |
矿业工程 | 8篇 |
能源动力 | 29篇 |
轻工业 | 21篇 |
水利工程 | 16篇 |
石油天然气 | 25篇 |
武器工业 | 16篇 |
无线电 | 196篇 |
一般工业技术 | 137篇 |
冶金工业 | 7篇 |
原子能技术 | 13篇 |
自动化技术 | 438篇 |
出版年
2024年 | 7篇 |
2023年 | 21篇 |
2022年 | 17篇 |
2021年 | 20篇 |
2020年 | 21篇 |
2019年 | 26篇 |
2018年 | 27篇 |
2017年 | 44篇 |
2016年 | 43篇 |
2015年 | 48篇 |
2014年 | 58篇 |
2013年 | 64篇 |
2012年 | 64篇 |
2011年 | 71篇 |
2010年 | 43篇 |
2009年 | 74篇 |
2008年 | 57篇 |
2007年 | 71篇 |
2006年 | 53篇 |
2005年 | 42篇 |
2004年 | 43篇 |
2003年 | 42篇 |
2002年 | 32篇 |
2001年 | 27篇 |
2000年 | 40篇 |
1999年 | 24篇 |
1998年 | 23篇 |
1997年 | 24篇 |
1996年 | 13篇 |
1995年 | 13篇 |
1994年 | 9篇 |
1993年 | 13篇 |
1992年 | 16篇 |
1991年 | 10篇 |
1990年 | 10篇 |
1989年 | 5篇 |
1988年 | 6篇 |
1987年 | 5篇 |
1986年 | 3篇 |
1985年 | 5篇 |
1984年 | 5篇 |
1983年 | 5篇 |
1982年 | 3篇 |
1981年 | 3篇 |
1978年 | 1篇 |
排序方式: 共有1251条查询结果,搜索用时 31 毫秒
1.
ABSTRACTIn this paper, we review some algebraic control system. Precisely, linear and bilinear systems on Euclidean spaces and invariant and linear systems on Lie groups. The fourth classes of systems have a common issue: to any class, there exists an associated subgroup. From this object, we survey the controllability property. Especially, from those coming from our contribution to the theory. 相似文献
2.
3.
Controllability of One Spin and Two Interacting Spins 总被引:1,自引:0,他引:1
Mathematics of Control, Signals, and Systems - ?We consider the problem of steering control for the systems of one spin ½ particle and two interacting spin ½ particles in an... 相似文献
4.
We present a two-sorted algebra, called aPeirce algebra, of relations and sets interacting with each other. In a Peirce algebra, sets can combine with each other as in a Boolean algebra, relations can combine with each other as in a relation algebra, and in addition we have both a set-forming operator on relations (the Peirce product of Boolean modules) and a relation-forming operator on sets (a cylindrification operation). Two applications of Peirce algebras are given. The first points out that Peirce algebras provide a natural algebraic framework for modelling certain programming constructs. The second shows that the so-calledterminological logics arising in knowledge representation have evolved a semantics best described as a calculus of relations interacting with sets. 相似文献
5.
The famous Antosik-Mikusinski convergent theorem on the Abel topological groups has very extensive applications in measure theory, summation theory and other analysis fields. In this paper, we establish the theorem on a class of effect algebras equipped with the ideal topology. This paper shows also that the ideal topology of effect algebras is a useful topology in studying the quantum logic the- ory. 相似文献
6.
Hua-Chieh Li 《Applicable Algebra in Engineering, Communication and Computing》2007,18(4):313-348
In this paper, we give a general criterion to determine when a complex space-time block code has a ring structure and then
we provide a complete list of complex space-time block codes which have ring structures up to size 4. 相似文献
7.
N. S. Nikitchenko 《Cybernetics and Systems Analysis》2003,39(1):97-112
Predicates that preserve their values on a larger (extended) body of data are called equitone. An algebra of such predicates is constructed, a system of its generators is specified, and a complete system of transformations of identities is defined. The results obtained are used for construction and investigation of complete classes of compositions of various types and levels of abstractions that are used in logics of partial predicates. 相似文献
8.
Hai-Yang Li Sheng-Gang Li 《Soft Computing - A Fusion of Foundations, Methodologies and Applications》2008,12(5):487-492
This paper is devoted to congruences and ideals in pseudoeffect algebras. Let I be a normal ideal in a pseudoeffect algebra E. We show that: (1) the relation ~
I
induced by I is a congruence if and only if for every a∈E, I∩ [0,a] is upper directed; (2) the relation ~
I
induced by I is a strong congruence if and only if I is a normal weak Riesz ideal in a pseudoeffect algebra E. Moreover, we introduce a stronger concept of congruence—namely Riesz strong congruence—and we prove that, if I is a normal weak Riesz ideal in a pseudoeffect algebra E, then ~
I
is a Riesz strong congruence and, conversely, if ~ is a Riesz strong congruence, then I = [0]~ is a normal weak Riesz ideal, and ~
I
= ~.
This work was supported by the National Natural Science Foundation of China (Grant No. 10271069). 相似文献
9.
There are two popular approaches to specifying the semantics of process algebras: labelled transition semantics and reaction semantics. While the notion of free name is rather unproblematic for labelled transition semantics this is not so for reaction semantics in the presence of a structural congruence for unfolding recursive declarations.We show that the standard definition of free name is not preserved under the structural congruence. We then develop a fixed point approach to the set of free names and show that it is invariant under the structural congruence. 相似文献
10.
再论变化电磁场中带电超微粒子的精确量子论 总被引:1,自引:1,他引:0
利用创新的SU(1 ,1 )Lie代数理论及SO(3)Lie代数理论 ,得到变化电磁场中带电超微粒子的精确量子论 ,由此进一步明确微观领域中的时空概念 相似文献