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   2622篇
  免费   330篇
  国内免费   283篇
电工技术   125篇
综合类   229篇
化学工业   143篇
金属工艺   128篇
机械仪表   184篇
建筑科学   133篇
矿业工程   94篇
能源动力   46篇
轻工业   116篇
水利工程   31篇
石油天然气   21篇
武器工业   33篇
无线电   691篇
一般工业技术   299篇
冶金工业   53篇
原子能技术   41篇
自动化技术   868篇
  2024年   7篇
  2023年   25篇
  2022年   57篇
  2021年   71篇
  2020年   74篇
  2019年   48篇
  2018年   63篇
  2017年   80篇
  2016年   107篇
  2015年   98篇
  2014年   156篇
  2013年   180篇
  2012年   238篇
  2011年   212篇
  2010年   170篇
  2009年   192篇
  2008年   201篇
  2007年   208篇
  2006年   182篇
  2005年   147篇
  2004年   131篇
  2003年   118篇
  2002年   66篇
  2001年   71篇
  2000年   66篇
  1999年   52篇
  1998年   28篇
  1997年   35篇
  1996年   32篇
  1995年   27篇
  1994年   15篇
  1993年   18篇
  1992年   15篇
  1991年   8篇
  1990年   5篇
  1989年   4篇
  1988年   2篇
  1987年   5篇
  1986年   3篇
  1985年   4篇
  1984年   1篇
  1983年   1篇
  1982年   2篇
  1981年   3篇
  1980年   1篇
  1978年   1篇
  1977年   2篇
  1974年   1篇
  1972年   2篇
排序方式: 共有3235条查询结果,搜索用时 0 毫秒
1.
谭民 《控制与决策》1994,9(4):266-270,300
本文对CIMS装配线和拆卸线的可靠性问题进行研究。文中分析了它们的运行状况,求出了两种生产线的稳态可用度,并用一个例子加以说明。  相似文献   
2.
径向非均匀磁场成形计算的解析—数值综合方法   总被引:1,自引:0,他引:1  
韩守真  尹兆升 《核技术》1989,12(6):360-364
  相似文献   
3.
We report the results of studies which have been made on heteroepitaxial layers of GaAs and AlGaAs grown by metalorganic chemical vapor deposition on composite substrates that consist of four different types of heteroepitaxial layered structures of Ge and Ge-Si grown by molecular beam epitaxy on (100)-oriented Si substrates. It is found that of the four structures studied, the preferred composite substrate is a single layer of Ge ∼1 μm thick grown directly on a Si buffer layer. The double-crystal X-ray rocking curves of 2 μm thick GaAs films grown on such substrates have FWHM values as small as 168 arc sec. Transmission electron micrographs of these Ge/Si composite substrates has shown that the number of dislocations in the Ge heteroepitaxial layer can be greatly reduced by an anneal at about 750° C for 30 min which is simultaneously carried out during the growth of the GaAs layer. The quality of the GaAs layers grown on these composite substrates can be greatly improved by the use of a five-period GaAs-GaAsP strained-layer superlattice (SLS). Using the results of these studies, low-threshold optically pumped AlGaAs-GaAs DH laser structures have been grown by MOCVD on MBE Ge/Si composite substrates.  相似文献   
4.
~~Growth of CeO_2, Y_2O_3 Buffer Layers for YBCO Coated Conductor  相似文献   
5.
The unity gain buffer will be good to design high frequency SCF if its resistiveeffects can be eliminated,and therefore the whole parasitic sensitivities will greatly be reduced.On the basis of this concept,a novel parasitic tolerant SC DTE(differential transconductanceelement)is proposed.SC floating inductor and integrator fit for high frequency applications areformed by the DTE.The computer simulation and experiment on a third order elliptic LP filterverify its validity.  相似文献   
6.
Germanium islands were embedded in strained silicon quantum wells in order to provide an improved electron confinement in vicinity of the islands. Growth was performed on relaxed SiGe layers. Patterned substrates were used, favouring lattice relaxation as well permitting the fabrication of small Ge islands at deposition temperatures above 500 °C. Photoluminescence analysis reveals a strongly reduced dislocation related signal. The low temperature spectra are dominated by intense signals from the germanium islands. The origin of these signals were investigated by removing the islands by etching, analysing reference samples without a silicon quantum well, varying the germanium deposition and the growth temperature.  相似文献   
7.
We present a technique for approximating isotropic BRDFs and precomputed self-occlusion that enables accurate and efficient prefiltered environment map rendering. Our approach uses a nonlinear approximation of the BRDF as a weighted sum of isotropic Gaussian functions. Our representation requires a minimal amount of storage, can accurately represent BRDFs of arbitrary sharpness, and is above all, efficient to render. We precompute visibility due to self-occlusion and store a low-frequency approximation suitable for glossy reflections. We demonstrate our method by fitting our representation to measured BRDF data, yielding high visual quality at real-time frame rates.  相似文献   
8.
高速连续数据记录系统中双页缓存的设计和实现   总被引:2,自引:0,他引:2  
在高速连续数据记录系统中,存储设备需要速度匹配单元来实现高速连续数据记录,文章讨论了双页缓存在高速连续记录系统中的作用,并以实际开发的记录系统为例,详细介绍了双页缓存的设计和实现。  相似文献   
9.
We present a new post processing method of simulating depth of field based on accurate calculations of circles of confusion. Compared to previous work, our method derives actual scene depth information directly from the existing depth buffer, requires no specialized rendering passes, and allows easy integration into existing rendering applications. Our implementation uses an adaptive, two‐pass filter, producing a high quality depth of field effect that can be executed entirely on the GPU, taking advantage of the parallelism of modern graphics cards and permitting real time performance when applied to large numbers of pixels.  相似文献   
10.
Buffer overflow vulnerabilities are one of the most commonly and widely exploited security vulnerabilities in programs. Most existing solutions for avoiding buffer overflows are either inadequate, inefficient or incompatible with existing code. In this paper, we present a novel approach for transparent and efficient runtime protection against buffer overflows. The approach is implemented by two tools: Type Information Extractor and Depositor (TIED) and LibsafePlus. TIED is first used on a binary executable or shared library file to extract type information from the debugging information inserted in the file by the compiler and reinsert it in the file as a data structure available at runtime. LibsafePlus is a shared library that is preloaded when the program is run. LibsafePlus intercepts unsafe C library calls such as strcpy and uses the type information made available by TIED at runtime to determine whether it would be ‘safe’ to carry out the operation. With our simple design we are able to protect most applications with a performance overhead of less than 10%. Copyright © 2006 John Wiley & Sons, Ltd.  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