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   4339篇
  免费   348篇
  国内免费   147篇
电工技术   46篇
技术理论   1篇
综合类   110篇
化学工业   66篇
金属工艺   75篇
机械仪表   309篇
建筑科学   1370篇
矿业工程   86篇
能源动力   86篇
轻工业   67篇
水利工程   76篇
石油天然气   28篇
武器工业   9篇
无线电   498篇
一般工业技术   221篇
冶金工业   30篇
原子能技术   47篇
自动化技术   1709篇
  2024年   10篇
  2023年   70篇
  2022年   91篇
  2021年   132篇
  2020年   142篇
  2019年   92篇
  2018年   75篇
  2017年   116篇
  2016年   176篇
  2015年   169篇
  2014年   287篇
  2013年   248篇
  2012年   284篇
  2011年   313篇
  2010年   212篇
  2009年   271篇
  2008年   243篇
  2007年   289篇
  2006年   271篇
  2005年   244篇
  2004年   190篇
  2003年   195篇
  2002年   138篇
  2001年   94篇
  2000年   84篇
  1999年   71篇
  1998年   66篇
  1997年   44篇
  1996年   39篇
  1995年   30篇
  1994年   33篇
  1993年   15篇
  1992年   18篇
  1991年   15篇
  1990年   9篇
  1989年   13篇
  1988年   7篇
  1987年   4篇
  1986年   11篇
  1985年   4篇
  1984年   1篇
  1983年   5篇
  1982年   2篇
  1981年   2篇
  1980年   3篇
  1979年   2篇
  1978年   2篇
  1977年   1篇
  1973年   1篇
排序方式: 共有4834条查询结果,搜索用时 0 毫秒
1.
The complexity and spatial heterogeneity of ecosystem processes driving ecosystem service delivery require spatially explicit models that take into account the different parameters affecting those processes. Current attempts to model ecosystem service delivery on a broad, regional scale often depend on indicator-based approaches that are generally not able to fully capture the complexity of ecosystem processes. Moreover, they do not allow quantification of uncertainty on their predictions. In this paper, we discuss a QGIS plug-in which promotes the use of Bayesian belief networks for regional modelling and mapping of ecosystem service delivery and associated uncertainties. Different types of specific Bayesian belief network output maps, delivered by the plug-in, are discussed and their decision support capacities are evaluated. This plug-in, used in combination with firmly developed Bayesian belief networks, has the potential to add value to current spatial ecosystem service accounting methods. The plug-in can also be used in other research domains dealing with spatial data and uncertainty.  相似文献   
2.
Hyperspectral imaging (HSI) is a spectroscopic method that uses densely sampled measurements along the electromagnetic spectrum to identify the unique molecular composition of an object. Traditionally HSI has been associated with remote sensing-type applications, but recently has found increased use in biomedicine, from investigations at the cellular to the tissue level. One of the main challenges in the analysis of HSI is estimating the proportions, also called abundance fractions of each of the molecular signatures. While there is great promise for HSI in the area of biomedicine, large variability in the measurements and artifacts related to the instrumentation has slow adoption into more widespread practice. In this article, we propose a novel regularization and variable selection method called the spatial LASSO (SPLASSO). The SPLASSO incorporates spatial information via a graph Laplacian-based penalty to help improve the model estimation process for multivariate response data. We show the strong performance of this approach on a benchmark HSI dataset with considerable improvement in predictive accuracy over the standard LASSO. Supplementary materials for this article are available online.  相似文献   
3.
本文除概略介绍气体检测器的种类处,主要对气体检测器的原理和在实际使用中的局限性作一基本归纳叙述。限于篇幅,本文将论述的重点放在气体检测器的选用与设置规划上,提出个人的一点心得与看法,以作为未来设置气体检测器系统时之参考。  相似文献   
4.
曹瑞忻 《包装工程》2002,23(3):157-158,161
阐述了视觉符号语言在版面设计中的编码与各种表现形式,强调信息社会的来临,以视觉为形态的符号语言将有效加速信息的传递。  相似文献   
5.
Similarity retrieval of iconic image database   总被引:3,自引:0,他引:3  
The perception of spatial relationships among objects in a picture is one of the important selection criteria to discriminate and retrieve the images in an iconic image database system. The data structure called 2D string, proposed by Chang et al., is adopted to represent symbolic pictures. The 2D string preserves the objects' spatial knowledge embedded in images. Since spatial relationship is a fuzzy concept, the capability of similarity retrieval for the retrieval by subpicture is essential. In this paper, similarity measure based on 2D string longest common subsequence is defined. The algorithm for similarity retrieval is also proposed. Similarity retrieval provides the iconic image database with the distinguishing function different from a conventional database.  相似文献   
6.
7.
WKB近似下的Fourier衍射成象方法   总被引:1,自引:0,他引:1  
石守元  葛德彪 《电子学报》1996,24(12):83-85
对于介质目标微波衍射成象,本文引入了WKB近似来模拟目标内部总场。基于这种近似,我们导出了Fourier衍射公式,并采用了广义滤波逆传播方法由目标空间谱实现目标特性的重建。计算机模拟结果表明采用WKB近似重建目标特性较Born近似有明显改善。  相似文献   
8.
Disparity field and depth map coding for multiview 3D image generation   总被引:3,自引:0,他引:3  
In the present paper techniques are examined for the coding of the depth map and disparity fields for stereo or multiview image communication applications. It is assumed that both the left and right channels of the multiview image sequence are coded using block- or object-based methods. A dynamic programming algorithm is used to estimate a disparity field between each stereo image pair. Depth is then estimated and occlusions are optionally detected, based on the estimated disparity fields. Spatial interpolation techniques are examined based on the disparity/depth information and the detection of occluded regions using either stereoscopic or trinocular camera configurations. It is seen that the presence of a third camera at the transmitter site improves the estimation of disparities, the detection of occlusions and the accuracy of the resulting spatial interpolation at the receiver. Various disparity field and depth map coding techniques are then proposed and evaluated, with emphasis given to the quality of the resulting intermediate images at the receiver site. Block-based and wireframe modeling techniques are examined for the coding of isolated depth or disparity map information. Further, 2D and 3D motion compensation techniques are evaluated for the coding of sequences of depth or disparity maps. The motion fields needed may be available as a byproduct of block-based or object-based coding of the intensity images. Experimental results are given for the evaluation of the performance of the proposed coding and spatial interpolation methods.  相似文献   
9.
探讨GIS技术在空间工程辅助设计(例如电力、电信管线工程)方面的应用.在系统分析空间工程设计的 逻辑过程和工程辅助设计系统的发展与需求的基础上,对GIS技术在空间工程辅助设计中应用的优势及工程辅助 设计GIS系统的结构、功能和特点以及系统基本设计思路进行了探讨,指出GIS技术的引入一方面提高了空间工 程辅助设计的效率和水平,同时使空间工程辅助设计成为同时具有规划和设计功能的系统。  相似文献   
10.
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