全文获取类型
收费全文 | 1704篇 |
免费 | 188篇 |
国内免费 | 158篇 |
专业分类
电工技术 | 249篇 |
技术理论 | 1篇 |
综合类 | 172篇 |
化学工业 | 84篇 |
金属工艺 | 82篇 |
机械仪表 | 73篇 |
建筑科学 | 141篇 |
矿业工程 | 46篇 |
能源动力 | 45篇 |
轻工业 | 259篇 |
水利工程 | 27篇 |
石油天然气 | 65篇 |
武器工业 | 11篇 |
无线电 | 237篇 |
一般工业技术 | 149篇 |
冶金工业 | 113篇 |
原子能技术 | 38篇 |
自动化技术 | 258篇 |
出版年
2024年 | 8篇 |
2023年 | 22篇 |
2022年 | 33篇 |
2021年 | 30篇 |
2020年 | 48篇 |
2019年 | 50篇 |
2018年 | 56篇 |
2017年 | 40篇 |
2016年 | 52篇 |
2015年 | 54篇 |
2014年 | 87篇 |
2013年 | 99篇 |
2012年 | 128篇 |
2011年 | 140篇 |
2010年 | 106篇 |
2009年 | 120篇 |
2008年 | 107篇 |
2007年 | 123篇 |
2006年 | 139篇 |
2005年 | 97篇 |
2004年 | 85篇 |
2003年 | 75篇 |
2002年 | 65篇 |
2001年 | 53篇 |
2000年 | 41篇 |
1999年 | 41篇 |
1998年 | 26篇 |
1997年 | 24篇 |
1996年 | 21篇 |
1995年 | 23篇 |
1994年 | 15篇 |
1993年 | 9篇 |
1992年 | 10篇 |
1991年 | 6篇 |
1990年 | 4篇 |
1989年 | 6篇 |
1988年 | 1篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1981年 | 1篇 |
1959年 | 2篇 |
排序方式: 共有2050条查询结果,搜索用时 31 毫秒
101.
在相同的纤维混合与工艺参数下分别制得环锭纺与集聚纺纱线织物,并在不同温度、氢氧化钠质量分数、浸渍时间及织物弹性伸长率条件下进行丝光处理。采用Mat-Lab计算分析软件对织物试样的X射线光谱进行分析,得到丝光作用的最佳条件。 相似文献
102.
Lieying Yao Weibin Li Yuhong Chen Yingqiao Wang Mingnan Bu Yali Wang Haotian Hu Weimin Xuan 《Fusion Engineering and Design》2013,88(9-10):1505-1508
The power supply control system is one of the most important local control systems of HL-2M tokamak. The power supply system of HL-2M is composed of four flywheel generator sets with total capacity of 600 MVA, all the magnetic field coil power supplies and high voltage power supplies of auxiliary heating system. The control system of power supply should make sure the large amount of on-site equipment and facilities to operate steadily and reliably.This paper presents the architecture of HL-2M control system and four kinds of established control networks. It describes how the power supply control system is built by using the established hardware structures and software agreements. Specially, it is focused on introducing an application of real-time technology based on the reflective shared memory and the fully digital compact solution for controlling the high power converters. Otherwise, a scheme which adopts PROFINET and Sequence of Events technology to carry out the intellect interlock control system is given. 相似文献
103.
104.
《国际计算机数学杂志》2012,89(2):339-352
In this paper, a derivation and a comparison of the truncation errors and the dissipation and dispersion terms of the fifth-order weighted essentially non-oscillatory scheme and of the weighted compact scheme are presented. The schemes are compared for smooth functions (by Fourier analysis), and near a shock. 相似文献
105.
《国际计算机数学杂志》2012,89(5):618-624
In this paper, based on the idea of the immersed interface method, a fourth-order compact finite difference scheme is proposed for solving one-dimensional Helmholtz equation with discontinuous coefficient, jump conditions are given at the interface. The Dirichlet boundary condition and the Neumann boundary condition are considered. The Neumann boundary condition is treated with a fourth-order scheme. Numerical experiments are included to confirm the accuracy and efficiency of the proposed method. 相似文献
106.
107.
Xin-rong Cong 《国际计算机数学杂志》2018,95(2):316-328
The high-order accurate compact finite difference scheme which belongs to the finite difference methods is constructed to solve the system of partial differential equations with random noise. The error analysis and stability analysis are given and then the numerical simulation is executed. The simulation results verify the theoretical analysis results and have the faster computation speed and higher accuracy. 相似文献
108.
《Expert systems with applications》2014,41(14):6224-6234
This paper is concerned with a method to build prototypes of human bodies that can be used for apparel design. One of the most important issues in the apparel development process is to define a sizing system to provide a good fitting for the majority of the population. Since anthropometric measures do not present the same linear growth with size in each dimension, it is very important to find a prototype that represents as accurately as possible each class in the sizing system. In this paper we propose a method based on the concept of random compact mean set to define prototypes in apparel design. From a cloud of 3D points obtained with a 3D scanner a solid that represents the human body is obtained. 2D cross sections of this solid are extracted at certain heights corresponding to key points of the body. These different cross-sections can be seen as a realization of a random compact set in the plane. A very popular definition on mean set is applied to each sample of 2D cross sections, and finally the prototype is obtained as the 3D reconstruction of these 2D mean sections. As a real example, the proposed methodology is applied to the 3D database obtained from a anthropometric survey of the Spanish female population conducted in this country in 2006. 相似文献
109.
Tijana Dimitrijević Jugoslav Joković Bratislav Milovanović Nebojša Dončov 《国际射频与微波计算机辅助工程杂志》2012,22(2):184-192
This article describes an implementation of a compact wire model into the three‐dimensional transmission‐line matrix (TLM) cylindrical mesh for the purpose of an efficient analysis of probe‐coupled cylindrical microwave cavity devices. Because of a cylindrical grid structure and empirical nature of the compact model, this implementation has to take into account a change of wire model parameters with a variable cross section of the TLM nodes through which a wire conductor passes. The model accuracy has been experimentally verified and compared with the corresponding results reached by the TLM method based on a rectangular grid in order to consider its advantages. © 2011 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2012. 相似文献
110.
采用算子论中的方法和技巧,研究了Bohr不等式的有界线性算子形式的推广,并且给出一些算子不等式,这样对文[4-5]中的结果进行了推广.进一步研究了Bohr不等式在算子范数上的性质,推广了文[6]中的相关结果. 相似文献