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   6789篇
  免费   216篇
  国内免费   21篇
电工技术   80篇
综合类   8篇
化学工业   1181篇
金属工艺   194篇
机械仪表   177篇
建筑科学   130篇
矿业工程   7篇
能源动力   443篇
轻工业   540篇
水利工程   73篇
石油天然气   88篇
武器工业   2篇
无线电   672篇
一般工业技术   1288篇
冶金工业   1498篇
原子能技术   61篇
自动化技术   584篇
  2023年   101篇
  2022年   190篇
  2021年   235篇
  2020年   211篇
  2019年   186篇
  2018年   276篇
  2017年   236篇
  2016年   223篇
  2015年   150篇
  2014年   217篇
  2013年   453篇
  2012年   237篇
  2011年   292篇
  2010年   218篇
  2009年   227篇
  2008年   221篇
  2007年   167篇
  2006年   162篇
  2005年   99篇
  2004年   84篇
  2003年   92篇
  2002年   74篇
  2001年   56篇
  2000年   72篇
  1999年   99篇
  1998年   409篇
  1997年   252篇
  1996年   203篇
  1995年   136篇
  1994年   120篇
  1993年   117篇
  1992年   68篇
  1991年   61篇
  1990年   54篇
  1989年   68篇
  1988年   48篇
  1987年   47篇
  1986年   54篇
  1985年   68篇
  1984年   48篇
  1983年   58篇
  1982年   63篇
  1981年   69篇
  1980年   62篇
  1979年   44篇
  1978年   30篇
  1977年   105篇
  1976年   138篇
  1974年   28篇
  1973年   24篇
排序方式: 共有7026条查询结果,搜索用时 15 毫秒
91.
Medical practice guidelines are being developed rapidly and advocated as a crucial component in transforming and improving the delivery of health care services. However, little is known about the ability of hospitals to institute guidelines outside of experimental settings. This article approaches guideline implementation from the viewpoint of process innovation assimilation and presents specific recommendations for organizational tactics leading to successful implementation of practice guidelines.  相似文献   
92.
In this paper, we have proposed some new numerical and semi-analytical methods for developing an equivalent three-layer model of an MQW waveguide. The waveguiding properties like effective index, field distribution, and fractional power within the core of the waveguide of these equivalent structures are compared with those of previously reported equivalent methods. These results are also compared with the results obtained from the exact multilayer analysis of the MQW waveguide. The waveguiding properties are accurately predicted by the semi-analytical method using variational analysis, and the computational effort is significantly reduced. The use of the three-layer equivalent is illustrated in obtaining an estimation of the waveguide losses and is used to study the effect of nonlinearity  相似文献   
93.
We have determined the nucleotide and encoded amino acid sequences of the capsid, membrane precursor, membrane, envelope, and nonstructural NS1 protein genes of a dengue-2 virus (D2-04) isolated from a patient in Hainan, China. The sequenced region contains a gene organization similar to that of other flaviviruses. The overall amino acid sequence similarity between D2-04 and other dengue-2 viruses is greater than 92%, whereas that between D2-04 and members of the other dengue serotypes is about 65%.  相似文献   
94.
95.
The Journal of Supercomputing - Multiple tasks arrive in the distributed systems that can be executed in either parallel or sequential manner. Before the execution, tasks are scheduled prioritywise...  相似文献   
96.
The Journal of Supercomputing - In this article, the authors suggested a rotation-invariant local binary pattern-based weighted generalized closest neighbor (RILBP-WGCN) method for HSI...  相似文献   
97.
Sharma  Shalini  Chou  Jerry 《The Journal of supercomputing》2021,77(10):10896-10920
The Journal of Supercomputing - Travelling salesman problem (TSP) is a graph problem that has been widely used in many applications, especially for transportation and logistics. Because TSP is a NP...  相似文献   
98.
Neural Computing and Applications - This work presents an efficient hybridized approach for the classification of electrocardiogram (ECG) samples into crucial arrhythmia classes to detect heartbeat...  相似文献   
99.
We propose a novel pose-invariant face recognition approach which we call Discriminant Multiple Coupled Latent Subspace framework. It finds the sets of projection directions for different poses such that the projected images of the same subject in different poses are maximally correlated in the latent space. Discriminant analysis with artificially simulated pose errors in the latent space makes it robust to small pose errors caused due to a subject’s incorrect pose estimation. We do a comparative analysis of three popular latent space learning approaches: Partial Least Squares (PLSs), Bilinear Model (BLM) and Canonical Correlational Analysis (CCA) in the proposed coupled latent subspace framework. We experimentally demonstrate that using more than two poses simultaneously with CCA results in better performance. We report state-of-the-art results for pose-invariant face recognition on CMU PIE and FERET and comparable results on MultiPIE when using only four fiducial points for alignment and intensity features.  相似文献   
100.
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