全文获取类型
收费全文 | 119篇 |
免费 | 1篇 |
国内免费 | 30篇 |
专业分类
电工技术 | 1篇 |
综合类 | 3篇 |
化学工业 | 20篇 |
金属工艺 | 7篇 |
机械仪表 | 4篇 |
建筑科学 | 4篇 |
矿业工程 | 2篇 |
能源动力 | 3篇 |
轻工业 | 19篇 |
水利工程 | 3篇 |
石油天然气 | 1篇 |
无线电 | 12篇 |
一般工业技术 | 16篇 |
冶金工业 | 4篇 |
自动化技术 | 51篇 |
出版年
2023年 | 3篇 |
2022年 | 3篇 |
2021年 | 3篇 |
2020年 | 5篇 |
2019年 | 6篇 |
2018年 | 5篇 |
2017年 | 7篇 |
2016年 | 2篇 |
2015年 | 9篇 |
2014年 | 12篇 |
2013年 | 12篇 |
2012年 | 12篇 |
2011年 | 11篇 |
2010年 | 8篇 |
2009年 | 8篇 |
2008年 | 3篇 |
2007年 | 10篇 |
2006年 | 5篇 |
2005年 | 9篇 |
2004年 | 1篇 |
2003年 | 4篇 |
2002年 | 1篇 |
2001年 | 2篇 |
2000年 | 5篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1992年 | 1篇 |
1991年 | 1篇 |
排序方式: 共有150条查询结果,搜索用时 15 毫秒
1.
2.
基于视觉权值的分块颜色直方图图像检索算法 总被引:4,自引:0,他引:4
为了进一步提高基于颜色直方图的图像检索系统工作效率, 本文以人眼视觉感知特性为基础, 结合局部图像相关性, 提出了一种基于视觉权值的分块颜色直方图图像检索新方法. 该方法首先对图像进行分块处理, 并计算出图像子块的颜色直方图; 然后结合反映局部区域变化的像素点颜色复杂度, 计算出图像子块的视觉权值; 最后利用视觉权值对子块颜色直方图进行加权处理, 并根据加权颜色直方图进行图像检索. 仿真实验结果表明, 本文算法能够准确和高效地查找出用户所需内容的彩色图像, 并且具有较好的查准率和查全率. 相似文献
3.
Hong-Ying Yang Xiang-Yang Wang Xian-Yin Zhang Juan Bu 《Engineering Applications of Artificial Intelligence》2012,25(8):1656-1669
Image segmentation partitions an image into nonoverlapping regions, which ideally should be meaningful for a certain purpose. Thus, image segmentation plays an important role in many multimedia applications. In recent years, many image segmentation algorithms have been developed, but they are often very complex and some undesired results occur frequently. By combination of Fuzzy Support Vector Machine (FSVM) and Fuzzy C-Means (FCM), a color texture segmentation based on image pixel classification is proposed in this paper. Specifically, we first extract the pixel-level color feature and texture feature of the image via the local spatial similarity measure model and localized Fourier transform, which is used as input of FSVM model (classifier). We then train the FSVM model (classifier) by using FCM with the extracted pixel-level features. Color image segmentation can be then performed through the trained FSVM model (classifier). Compared with three other segmentation algorithms, the results show that the proposed algorithm is more effective in color image segmentation. 相似文献
4.
Dong-Sheng Yang Ting-Yi Chen Jing Ling Hong-Ying Wang Zong-Hui Huang Zi-Xiang Lu 《Numerical Heat Transfer, Part B: Fundamentals》2017,71(3):270-282
A new high-precision boundary meshfree method, namely virtual boundary meshfree Galerkin method (VBMGM), for calculating the multi-domain constant coefficient heat conduction with a heat source problem is given. In the paper, the radial basis function interpolation is used to solve the virtual source function of virtual boundary and the heat source within each subdomain. Simultaneously, the equation of VBMGM for multi-domain constant coefficient heat conduction with a heat source problem is obtained by the Galerkin method. Therefore, the proposed method has common advantages of the boundary element method, meshfree method, and Galerkin method. Coefficient matrix of this specific expression is symmetrical and the specific expression of VBMGM for the multi-domain constant coefficient heat conduction with a heat source problem is given. Two numerical examples are given. The numerical results are also compared with other numerical methods. The accuracy and feasibility of the method for the multi-domain constant coefficient heat conduction with a heat source problem are proved. 相似文献
5.
Hong-Ying Li Dong-Dong WeiJi-Dong Hu Yang-Hua Li Shao-Lin Chen 《Computational Materials Science》2012,53(1):425-430
Hot compression tests of T24 ferritic steel were carried out using Gleeble-3500 thermo mechanical simulator in the temperature range of 1323-1473 K with the strain rate of 0.01-10 s−1 and the height reduction of 60%. The flow behavior of T24 ferritic steel was characterized based on analysis of the true stress-strain curves. Constitutive equations incorporating the effects of temperature, strain rate and strain have been developed to model the hot deformation behavior of T24 ferritic steel. Material constants α, n, ln A and activation energy Q in the constitutive equations were calculated as a function of strain. The flow stress values of T24 ferritic steel predicted by the proposed constitutive equations show a good agreement with experimental results, which indicated that the developed constitutive equations could give an accurate and precise prediction for the flow stress of T24 ferritic steel. 相似文献
6.
Effect of Mn substitution for Fe in cubic Laves Zr_(0.1)Tb_(0.9)(Fe_(1-x)Mn_x)_2 and Y_(0.1)Tb_(0.9)(Fe_(1-x)Mn_x)_2 com-pounds is presented.Similar results in both systems are obtained: The structure and the magnetism of TbFe_2 areboth influenced slightly by a small amount of Y or Zr substitution for Tb;With increasing x value,the latticeconstant increases monotonously;the Curie temperature decreases linearly;while saturation magnetizationincreases linearly.For the small amount of Mn substitution for Fe in both systems,magnetostriction issignificantly larger than that in the pure iron alloys.The largest magnetostriction of|γ_‖-|γ_|=2200×10~(-6)at magnetic field of 2×10~7/4π A/mis obtained for Y_(0.1)Tb_(0.9)(Fe_(0.95)Mn_(0.05)_2. 相似文献
7.
8.
9.
以非离子型表面活性剂P123和三甲基苯的微乳液为模板剂合成介孔SiO2粉体.以此粉体为原料,经干压成型、烧结制备多孔SiO2块材.分别用AlOOH溶胶和TiO2溶胶包覆多孔SiO2粉体,制成多孔SiO2/Al2O3块材和SiO2/TiO2块材.采用XRD、SEM、TEM、N2吸附法和阿基米德排水法对所制粉体和块材进行了表征,并研究了块材的热稳定性.结果表明,600~700℃烧结的多孔SiO2基块材的孔隙率为74%~76%.与多孔SiO2块材相比,在800~1000℃范围内,SiO2/Al2O3块材的热稳定性显著提高,SiO2/TiO2块材的热稳定性在800~900℃范围内有一定改善. 相似文献
10.