全文获取类型
收费全文 | 2142篇 |
免费 | 225篇 |
国内免费 | 89篇 |
专业分类
电工技术 | 56篇 |
综合类 | 271篇 |
化学工业 | 16篇 |
金属工艺 | 47篇 |
机械仪表 | 174篇 |
建筑科学 | 169篇 |
矿业工程 | 23篇 |
能源动力 | 3篇 |
轻工业 | 46篇 |
水利工程 | 4篇 |
石油天然气 | 10篇 |
武器工业 | 13篇 |
无线电 | 459篇 |
一般工业技术 | 239篇 |
冶金工业 | 18篇 |
原子能技术 | 3篇 |
自动化技术 | 905篇 |
出版年
2024年 | 7篇 |
2023年 | 36篇 |
2022年 | 40篇 |
2021年 | 31篇 |
2020年 | 44篇 |
2019年 | 38篇 |
2018年 | 62篇 |
2017年 | 59篇 |
2016年 | 81篇 |
2015年 | 100篇 |
2014年 | 129篇 |
2013年 | 120篇 |
2012年 | 156篇 |
2011年 | 178篇 |
2010年 | 148篇 |
2009年 | 172篇 |
2008年 | 145篇 |
2007年 | 178篇 |
2006年 | 119篇 |
2005年 | 119篇 |
2004年 | 107篇 |
2003年 | 69篇 |
2002年 | 58篇 |
2001年 | 47篇 |
2000年 | 34篇 |
1999年 | 33篇 |
1998年 | 30篇 |
1997年 | 12篇 |
1996年 | 24篇 |
1995年 | 15篇 |
1994年 | 12篇 |
1993年 | 13篇 |
1992年 | 14篇 |
1991年 | 4篇 |
1990年 | 5篇 |
1989年 | 1篇 |
1988年 | 3篇 |
1985年 | 3篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1981年 | 2篇 |
1980年 | 1篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1968年 | 1篇 |
1965年 | 1篇 |
1964年 | 1篇 |
排序方式: 共有2456条查询结果,搜索用时 15 毫秒
1.
2.
In this paper we design an experiment which can be depicted as a simple scenario, a very limited 'world'. In this world, there are an actor that can pursue a project and an observer that is keeping its eyes on the actor. We try to show in the experiment that the observer can to some degree understand the actor based on its knowledge and some metaphors, i.e. understand what the actor is doing and why. As the conclusion of this experiment, we try to show some features of 'understanding'. These are (1) that 'understanding' has to be based on some preliminary knowledge; (2) that 'understanding' is a process of incremental learning; (3) that, as for symbolic systems, some metaphors are necessary for mapping real entities into concepts in mind. 相似文献
3.
In this article, we describe a knowledge-based controlled platform using program supervision techniques. This platform eases
the creation and the configuration of video surveillance systems. Several issues need to be addressed to provide a correct
system configuration: (1) to choose, among a library of programs, those which are best satisfying a given user request, (2)
to assign a correct value for each program parameter, (3) to evaluate performances and to guarantee a performance rate which
is satisfactory regarding end-user requirements. This platform is composed of three main components: the library of programs,
the knowledge base and the control component. The knowledge is either given by experts or learnt by the system. The control
is generic in the sense that it is independent of any application. To validate this platform, we have built and evaluated
six video surveillance systems which are featured with three properties: adaptability, reliability and real-time processing. 相似文献
4.
分析了当前对于从固定背景下的特征符号与背景符号相粘连的图表中提取信息所存在的问题,设计了适用于此类问题的方法模型。提出了一种在固定背景下通过背景符号检测和背景符号擦除来实现随机波形提取的方法。 相似文献
5.
Motion Perception Using Analog VLSI 总被引:2,自引:0,他引:2
Andre J.S. Yakovleff Alireza Moini 《Analog Integrated Circuits and Signal Processing》1998,15(2):183-200
Motion perception is arguably a fundamental mechanism used by natural species to accomplish a number of tasks, such as navigating freely in an unknown environment. Traditional motion perception methods tend to be computationally intensive, requiring powerful computers and large memories. However, by copying biological mechanisms, such as elementary motion discrimination at the early stages of the visual processing paths, it should be possible to build small and efficient motion perception systems. This paper describes the manner in which a simple motion perception model based on the insect visual system has been implemented using mixed analog/digital VLSI. The device has been fabricated in a 2 micron double metal, double polysilicon process, and comprises 61 photo-detectors, and associated analog and digital circuitry. While not entirely successful in that component mismatches hamper the detection of dark-to-bright changes in contrast, the results clearly show the feasibility of using such a device in autonomous control systems. 相似文献
6.
Inverse surface design problems from light transport behavior specification usually represent extremely complex and costly processes, but their importance is well known. In particular, they are very interesting for lighting and luminaire design, in which it is usually difficult to test design decisions on a physical model in order to avoid costly mistakes. In this survey, we present the main ideas behind these kinds of problems, characterize them, and summarize existing work in the area, revealing problems that remain open and possible areas of further research. 相似文献
7.
8.
RLL码的计算机辅助设计 总被引:1,自引:1,他引:0
本文着重讨论计算机辅助设计RLL码的具体实现问题.该过程首先根据RLL码两个参数d,k确定一个编码率p/q,然后构造出RLL码的高阶状态转换-输出符号矩阵并求相应的近似特征向量.最后通过状态分裂和状态归并过程,即可得到一个满足d,k约束的编码输出表.其中状态转换-输出符号矩阵为实现计算机辅助设计RLL码提供了有效的数据结构,而且要优化RLL码编码器,就必须有选择地进行状态分裂. 相似文献
9.
以电气符号为例,介绍了AutoCAD平台下图像控制菜单的开发过程以及幻灯片、幻灯片库的创建方法。 相似文献
10.
高精度视觉贴片机拾放程序设计编程 总被引:3,自引:0,他引:3
龙绪明 《电子工业专用设备》2002,31(3):151-155,183
探讨了SMT高精度视觉贴片机难点之一拾放程序设计编程 ,重点介绍示教编程和CAD输入编程设计方法。 相似文献