首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   2954篇
  免费   431篇
  国内免费   547篇
电工技术   161篇
综合类   326篇
化学工业   94篇
金属工艺   91篇
机械仪表   620篇
建筑科学   70篇
矿业工程   50篇
能源动力   24篇
轻工业   42篇
水利工程   13篇
石油天然气   11篇
武器工业   46篇
无线电   814篇
一般工业技术   335篇
冶金工业   25篇
原子能技术   67篇
自动化技术   1143篇
  2024年   9篇
  2023年   35篇
  2022年   78篇
  2021年   64篇
  2020年   85篇
  2019年   67篇
  2018年   85篇
  2017年   125篇
  2016年   148篇
  2015年   170篇
  2014年   301篇
  2013年   260篇
  2012年   294篇
  2011年   296篇
  2010年   235篇
  2009年   218篇
  2008年   240篇
  2007年   238篇
  2006年   190篇
  2005年   158篇
  2004年   128篇
  2003年   95篇
  2002年   87篇
  2001年   67篇
  2000年   65篇
  1999年   34篇
  1998年   21篇
  1997年   33篇
  1996年   20篇
  1995年   14篇
  1994年   9篇
  1993年   14篇
  1992年   13篇
  1991年   11篇
  1990年   7篇
  1989年   3篇
  1988年   3篇
  1987年   2篇
  1986年   1篇
  1985年   2篇
  1984年   3篇
  1983年   1篇
  1982年   1篇
  1981年   1篇
  1964年   1篇
排序方式: 共有3932条查询结果,搜索用时 15 毫秒
1.
通用串行总线原理及其外设接口设计   总被引:7,自引:0,他引:7  
以通用串行总线(USB)1.1为基础,讨论了USB的体系结构、工作原理、通信协议和相应的核心技术,并介绍了一种基于USB接口的数字摄像系统的设计方案及其软件、固件的设计.  相似文献   
2.
The main purpose of this paper is to find the mixed-mode stress intensity factors of composite materials using the crack opening displacement (COD). First, a series solution of the composite material with a crack was used to evaluate COD values. Then, the least-squares method was used to calculate mixed-mode stress intensity factors. This algorithm can be applied to any method that generates or measures COD values. The major advantage of this method is that COD values very near the crack tip are not necessary. Both finite element simulations and laboratory experiments were applied to validate this least-squares method with acceptable accuracy if the even terms of the series solution are removed.  相似文献   
3.
4.
水下成像的现状和发展动向   总被引:5,自引:0,他引:5  
本文以下水成像在军事,海洋开发工程应用为基础,论述了水下观测和成像中采用微光电视摄像机和激光器件及其系统的技术现状和发展动向。  相似文献   
5.
介绍视觉技术在YP19装封箱机的装箱过程中的应用,简述视觉技术系统的基本组成、工作原理及软件设计。  相似文献   
6.
Several hundred workers die in construction in the United States every year because equipment operators are unable to see their fellow workers during operation of their vehicle. In this paper we propose a step towards improving this situation by providing an automated method based on range imaging for estimating the coarse head orientation of a construction equipment operator. This research utilizes commercially-available low resolution range cameras to measure the continuously changing field-of-view (FOV) of an equipment operator in outdoor construction. This paper presents a methodology to measure so-called dynamic blind spot maps. The dynamic blind spot map is then projected on a known static equipment blind spot map that already exists to each construction vehicle. A robust computational coarse head pose estimation algorithm and results to three different pieces of construction equipment and multiple operators are presented. The developed method has the potential in automatically determining the spaces around vehicles that are currently not in the field-of-view of the vehicle operator thus providing eventually additional means and technology for improving safety in construction.  相似文献   
7.
电磁成形中的测量   总被引:2,自引:1,他引:2  
本文简要介绍了电磁成形中放电电流、管坯与线圈间隙中的磁场测量 ,以及管坯动态变形过程测量的各种方法。通过各种方法的比较分析 ,得出分流器法测放电电流、探测线圈法测感生磁场是切实可行的方法。金属坯料在电磁力作用下的变形过程可用撞针法和高速摄影的办法进行测量 ,每种方法各有其优势和适用范围 ,测量时 ,根据实际情况进行选用。  相似文献   
8.
On board camera is the most important information source for driver assistant application which is based on computer vision. One problem for on board camera is that the external parameters are easy to be changed when moving on the road. Traditional method either calibrates external parameters offline or calibrates external parameters semi-online, which both need human intervention. By observation, it is found that corner connection of dotted road lane can form two groups of parallel lines. Using this geometric characteristics and through theoretical derivation, a novel online camera external parameter calibration method is proposed which focus on the situation when vehicle is moving. The pro of this method is that it maintains relatively high calculation accuracy and more important, it does not require any human intervention in whole calibration process. Experimental and comparison results show that this method is simple and have accurate results which fully meet the requirements of practical application.  相似文献   
9.
A new approach is presented for the characterization of particle motion in fluid-solid systems based on dynamic imaging with a gamma scintillation camera. A two-dimensional spouted bed of 200-500 micron diameter anion exchange resin beads was used as a test system. One or several beads were radiolabeled with the 140 keV gamma emitting radionuclide 99m-Tc pertechnetate, and particle velocity, panicle path, the spatial distribution of particle residence times, and local bed density were determined from the measured temporal and spatial distributions of particle activity. While care must be exercised in the interpretation of data when the scale for changes in the spatial distribution of activity approaches the limits of camera resolution, the method is quantitative, non-invasive, and well suited to the study of systems having symmetry in one spatial dimension.  相似文献   
10.
为了保证广角摄像机在现代机器人视觉定位应用中的准确性,以广角摄像机像素坐标的反畸变过程为研究对象,提出一种在畸变对应表的基础上使用中心迭代法以及区域插值法确定物体实际位置的方法。通过实验证明了该方法能够测量物体的位置,其精度能够满足工业使用要求。  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号