全文获取类型
收费全文 | 1048篇 |
免费 | 139篇 |
国内免费 | 60篇 |
专业分类
电工技术 | 47篇 |
综合类 | 124篇 |
化学工业 | 100篇 |
金属工艺 | 17篇 |
机械仪表 | 35篇 |
建筑科学 | 34篇 |
矿业工程 | 1篇 |
能源动力 | 6篇 |
轻工业 | 6篇 |
水利工程 | 18篇 |
石油天然气 | 3篇 |
武器工业 | 4篇 |
无线电 | 240篇 |
一般工业技术 | 139篇 |
冶金工业 | 22篇 |
原子能技术 | 7篇 |
自动化技术 | 444篇 |
出版年
2024年 | 1篇 |
2023年 | 7篇 |
2022年 | 11篇 |
2021年 | 14篇 |
2020年 | 24篇 |
2019年 | 18篇 |
2018年 | 13篇 |
2017年 | 28篇 |
2016年 | 38篇 |
2015年 | 39篇 |
2014年 | 46篇 |
2013年 | 83篇 |
2012年 | 73篇 |
2011年 | 74篇 |
2010年 | 74篇 |
2009年 | 92篇 |
2008年 | 90篇 |
2007年 | 89篇 |
2006年 | 72篇 |
2005年 | 61篇 |
2004年 | 54篇 |
2003年 | 48篇 |
2002年 | 22篇 |
2001年 | 27篇 |
2000年 | 24篇 |
1999年 | 12篇 |
1998年 | 18篇 |
1997年 | 9篇 |
1996年 | 15篇 |
1995年 | 13篇 |
1994年 | 9篇 |
1993年 | 9篇 |
1992年 | 1篇 |
1991年 | 8篇 |
1990年 | 4篇 |
1989年 | 3篇 |
1988年 | 4篇 |
1987年 | 4篇 |
1986年 | 4篇 |
1985年 | 1篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1982年 | 4篇 |
1981年 | 2篇 |
1977年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有1247条查询结果,搜索用时 15 毫秒
101.
102.
尺度函数各阶矩及二阶微分算子标准形式计算 总被引:2,自引:0,他引:2
为了有效地利用小波分析来求解电磁问题,文章在Beylkin等人年近来的工作基础上,给出了Daubechies小波尺度函数各阶矩以及二阶微分算子标准形式的数值计算结果。 相似文献
103.
对混合结构的承重纵墙进行非线性全过程分析,计算简图是由钢筋混凝土梁和砖砌体柱组成的组合平面框架,采用实际刚度法的杆系模型。分析结果表明,墙体的约束弯矩与上部压力及梁的上部钢筋面积紧密相关;在加载过程中,墙体不断发生内力重分布;变截面墙体会出现弯矩变号,最大变矩不一定与最大荷载对应,同时指出了线弹性分析方法所得计算结果的误差较大,并分析了原因。 相似文献
104.
郭绍臣 《沈阳建筑工程学院学报(自然科学版)》1995,(4)
提出用力矩分配法计算弹性转动支座上的刚架,导出了弹性转动支座梁的形常数与载常数的计算公式,并附有例题. 相似文献
105.
童岳生 《西安建筑科技大学学报(自然科学版)》1993,(2)
利用框架结构中同时考虑结点转动与侧移的弯矩迭代计算方法,分析了水平荷载作用下框架-剪力墙结构的内力并计算出结构的侧移变形。本方法适用于沿房屋高度方向层间刚度相同或不相同的框架-剪力墙结构,作用有任意分布形式的水平荷载。 相似文献
106.
Judit Martinez Josep M. Porta Federico Thomas 《Journal of Mathematical Imaging and Vision》2006,26(1-2):105-113
An image can be seen as an element of a vector space and hence it can be expressed in as a linear combination of the elements
of any non necessarily orthogonal basis of this space. After giving a matrix formulation of this well-known fact, this paper
presents a reconstruction method of an image from its moments that sheds new light on this inverse problem. Two main contributions
are presented: (a) the results using the standard approach based on the least squares approximation of the result using orthogonal
polynomials can also be obtained using matrix pseudoinverses, which implies higher control on the numerical stability of the
problem; and (b) it is possible to use basis functions in the reconstruction different from orthogonal polynomials, such as
Fourier or Haar basis, allowing to introduce constraints relative to the bandwidth or the spatial resolution on the image
to be reconstructed.
Judit Martònez received the B.Sc. degree in 1993 and the PhD degree (with honors) in 1998, both in telecommunications engineering from the
Technical University of Catalonia. She developed her research at the Institut de Robútica i Informütica Industrial of the
Spanish High Council for Scientific Research. In 1999 she joined the Computer Vision Center, a R&D center founded by the Autonomous
University of Barcelona and the Autonomous Government of Catalonia. She has been principal researcher of several industrial
and research projects related to computer vision technologies. Her research interests include industrial applications of machine
vision, efficient algorithms for low-level image processing, multiresolution mathematical models, statistical clustering,
pattern classification and inverse problems.
Josep M. Porta received the Engineer Degree in Computer Science in 1994 and the Ph.D. in Artificial Intelligence in 2001, both from the
Technical University of Catalonia (UPC). After that, he joined the IAS group of the University of Amsterdam and currently,
he holds a post-doc position at the Institut de Robútica i Informütica Industrial (CSIC-UPC) in Barcelona. He carried research
in legged robots, machine learning, vision-based methods for autonomous robot localization, and computational kinematics.
Federico Thomas is Research Professor at the Spanish Scientific Research Council (CSIC) and director of the Institut de Robútica i Informütica
Industrial (CSIC-UPC), Barcelona, Spain. He received the telecommunications engineering degree in 1984, and the Ph.D. degree
(with honors) in computer science in 1988, both from the Technical University of Catalonia (UPC). In 1991, he won a NATO postdoctoral
scholarship at the University of Massachusetts with the late Prof. Robin Popplestone. In 1999, he was visiting professor,
sponsored by the Autonomous Government of Catalonia, at the Oxford University Computing Laboratory with Prof. Stephen Cameron.
He has been project leader of several national projects financed by the Spanish Committee for Science and Technology (CICYT),
and by local companies such as ENHER, a power generation company now part of ENDESA.
His current research interests are in Geometry and Kinematics with applications to Robotics, Computer Graphics and Computer
Vision. Prof. Thomas is an Associate Editor of the IEEE Transactions on Robotics. 相似文献
107.
108.
Giampiero Passarino 《Computer Physics Communications》1996,97(3):261-303
The program WTO, which is designed for computing cross sections and other relevant observables in the e+e− annihilation into four fermions, is described. The various quantities are computed over both a completely inclusive experimental set-up and a realistic one, i.e. with cuts on the final state energies, final state angles, scattering angles and final state invariant masses. Initial state QED corrections are included by means of the structure function approach while final state QCD corrections are applicable in their naive formulation. A gauge restoring mechanism is included according to the Fermion-Loop scheme. The program structure is highly modular and particular care has been devoted to computing efficiency and speed. 相似文献
109.
The kinetic theory of polyatomic gases is used to test the mutual consistency of the thermal conductivity, viscosity and specific heat of low-pressure steam from 100° to 700°C. No inconsistency exists within the cited tolerances of the skeleton tables recommended by the Sixth International Conference on the Properties of Steam, but there is some basis for suspecting that the high-temperature thermal conductivity values are slightly low. Methods for tightening the consistency bounds are suggested. 相似文献
110.
Joviša Žunić 《Journal of Mathematical Imaging and Vision》2004,21(3):199-204
A digital disc is defined as the set of all integer points inside of a given real disc. In this paper we show that there are no more than
different (up to translations) digital discs consisting of n points. 相似文献