全文获取类型
收费全文 | 22784篇 |
免费 | 2414篇 |
国内免费 | 1802篇 |
专业分类
电工技术 | 1780篇 |
技术理论 | 10篇 |
综合类 | 2877篇 |
化学工业 | 1020篇 |
金属工艺 | 444篇 |
机械仪表 | 1883篇 |
建筑科学 | 2011篇 |
矿业工程 | 525篇 |
能源动力 | 543篇 |
轻工业 | 457篇 |
水利工程 | 374篇 |
石油天然气 | 510篇 |
武器工业 | 197篇 |
无线电 | 2294篇 |
一般工业技术 | 2008篇 |
冶金工业 | 1038篇 |
原子能技术 | 75篇 |
自动化技术 | 8954篇 |
出版年
2024年 | 161篇 |
2023年 | 396篇 |
2022年 | 682篇 |
2021年 | 750篇 |
2020年 | 689篇 |
2019年 | 535篇 |
2018年 | 482篇 |
2017年 | 532篇 |
2016年 | 655篇 |
2015年 | 790篇 |
2014年 | 1375篇 |
2013年 | 1337篇 |
2012年 | 1501篇 |
2011年 | 1724篇 |
2010年 | 1443篇 |
2009年 | 1364篇 |
2008年 | 1433篇 |
2007年 | 1590篇 |
2006年 | 1505篇 |
2005年 | 1321篇 |
2004年 | 1207篇 |
2003年 | 1015篇 |
2002年 | 771篇 |
2001年 | 750篇 |
2000年 | 596篇 |
1999年 | 507篇 |
1998年 | 330篇 |
1997年 | 251篇 |
1996年 | 219篇 |
1995年 | 224篇 |
1994年 | 160篇 |
1993年 | 147篇 |
1992年 | 110篇 |
1991年 | 88篇 |
1990年 | 67篇 |
1989年 | 71篇 |
1988年 | 62篇 |
1987年 | 23篇 |
1986年 | 25篇 |
1985年 | 19篇 |
1984年 | 11篇 |
1983年 | 9篇 |
1981年 | 5篇 |
1980年 | 6篇 |
1979年 | 7篇 |
1966年 | 4篇 |
1965年 | 4篇 |
1963年 | 5篇 |
1958年 | 4篇 |
1956年 | 4篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
徐向红 《沙洲职业工学院学报》2003,6(1):20-23
通过分析各种冲突解决方法的特点,提出了一种冲突的集成解决方案。采用面向对象的Object Pascal语言编制了一个实例,给出了该方法在零件结构工艺性设计中的具体应用。 相似文献
72.
知识经济的发展,使知识和创新,成为人类活动的强大动力,人类的实践活动迈入了崭新阶段。人类的潜在智慧和才能,正源源不断地释放出来,转化为对象性存在,充分展示了人类活动的主体性效应,与此同时我们也必须正视人类活动的反主体性的效应。正确处理主体自觉能动性和客体自然性之间矛盾,是强化人类活动的主体性效应,防止反主体性效应的前提条件。 相似文献
73.
Intelligent multisensor surveillance systems consist of several types of sensors, which are installed on fixed and mobile devices. These components provide a huge quantity of information that has to be contrasted, correlated and integrated in order to recognize and react on special situations. These systems work in highly dynamic environments, with severe security and robustness requirements. All these characteristics imply the need for distributed solutions. In these solutions, scattered components can decide and act with some degree of autonomy (for instance, if they become isolated), or cooperate and coordinate for a complete tracking of special situations. In order to cope with these requirements and to better structure the solution, we have decided to design surveillance system control as a multiagent system. This is done by applying an agent-orientated methodology, which is assessed with concrete scenarios. 相似文献
74.
面向对象机器翻译知识库IMT—KB的设计与实现 总被引:1,自引:0,他引:1
机器翻译知识库是机译系统的重要组成部分,针对传统机译知识库的不足之处,本文提出一种面向对象的机译知识体系结构,同时给出这种具有层次性和模块性机译知识库的存储组织和管理机制。 相似文献
75.
Chin-Wan Chung 《Journal of Systems Integration》1995,5(3):253-274
Currently relational databases are widely used, while object-oriented databases are emerging as a new generation of database technology. This paper presents a methodology to provide effective sharing of information in object-oriented databases and relational databases. The object-oriented data model is selected as a common data model to build an integrated view of the diverse databases. An object-oriented query language is used as a standard query language. A method is developed to transform a relational data definition to an equivalent object-oriented data definition and to integrate local data definitions. Two distributed query processing methods are derived. One is for general queries and the other for a special class of restricted queries. Using the methods developed, it is possible to access distributed object-oriented databases and relational databases such that the locations and the structural differences of the databases are transparent to users. 相似文献
76.
对象模型及其模型化方法——一种深知识的表示模型 总被引:6,自引:0,他引:6
本文介绍了对象模型和深知识等概念,在这些概念的基础上还讨论了基于框架知识表示形式的复杂系统的模型化方法.文中给出的模型化方法是通过 ISA 关系和 PART-OF 关系的相结合而形成的.这种模型化方法可用于基于深知识的设计型、分析型以及控制型等类型的专家系统. 相似文献
77.
In this paper, we propose an ID-based non-interactive zero-knowledge proof system based on the 1-out-of-2 noninteractive oblivious transfer protocol. This zero-knowledge proof system is secure against a newly discovered cheating attack. 相似文献
78.
79.
In the last decade there was growing interest in strategic management literature about factors that influence a company's ability to use IT. There is general consensus that knowledge and competency are necessary in developing an IT capability, but there is very little understanding of what the necessary competencies are, and how they influence IS usage in different contexts. The small and medium-sized enterprise context is particularly interesting for two reasons: it constitutes a major part of the economy and it has been relatively unsuccessful in exploiting e-business. 相似文献
80.
This paper introduces the Precise Rendering Method, which generates accurately anti-aliased and highlighted images from tessellated polygons. The Precise Rendering Method first solves the aliasing problems of hidden surface removal by using the Cross Scanline Algorithm. This algorithm can exactly calculate polygon areas projected onto each pixel by using horizontal and vertical scanlines. Aliasing artifacts in shading are then prevented by the Reflection Intergration Method, which analytically integrates the intensity of reflection in the solid angle defined by surface normals at vertices of the projected area. Several synthesized images are created to show the efficiency of the Precise Rendering Method. 相似文献