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   28153篇
  免费   4336篇
  国内免费   1155篇
电工技术   2666篇
技术理论   3篇
综合类   3485篇
化学工业   2113篇
金属工艺   882篇
机械仪表   1445篇
建筑科学   1797篇
矿业工程   1062篇
能源动力   1006篇
轻工业   769篇
水利工程   1402篇
石油天然气   2218篇
武器工业   678篇
无线电   5351篇
一般工业技术   4988篇
冶金工业   507篇
原子能技术   392篇
自动化技术   2880篇
  2025年   204篇
  2024年   658篇
  2023年   608篇
  2022年   822篇
  2021年   870篇
  2020年   837篇
  2019年   831篇
  2018年   738篇
  2017年   875篇
  2016年   1028篇
  2015年   991篇
  2014年   1530篇
  2013年   1628篇
  2012年   1925篇
  2011年   2050篇
  2010年   1610篇
  2009年   1674篇
  2008年   1473篇
  2007年   1815篇
  2006年   1750篇
  2005年   1382篇
  2004年   1219篇
  2003年   1128篇
  2002年   832篇
  2001年   758篇
  2000年   726篇
  1999年   615篇
  1998年   544篇
  1997年   415篇
  1996年   393篇
  1995年   337篇
  1994年   273篇
  1993年   244篇
  1992年   212篇
  1991年   143篇
  1990年   134篇
  1989年   104篇
  1988年   63篇
  1987年   43篇
  1986年   24篇
  1985年   24篇
  1984年   30篇
  1983年   20篇
  1982年   22篇
  1981年   10篇
  1980年   5篇
  1979年   8篇
  1978年   4篇
  1976年   4篇
  1975年   3篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
This paper describes the development and simulation of an unsteady state biofilter model used to predict dynamic behaviour of cyclically‐operated biofilters and compares it with experimental results obtained from three, parallel, bench‐scale biofilters treating both periodically fluctuating concentrations and constant concentrations of an α‐pinene‐laden gas stream. The dynamic model, using kinetic parameters estimated from the constant concentration biofilter, was able to predict the performance of cyclic biofilters operating at short cycle periods (ie, in the order of minutes and hours). Steady state kinetic data from a constant concentration biofilter can be used to predict unsteady state biofilter operation. At a 24 h cycle period, the dynamic model compared well with experimental results. For long cycle periods (ie, hours and days), removal efficiency decreased after periods of non‐loading: the longer the period of non‐loading, the poorer the biofilter's performance at the re‐commencement of pollutant loading. At longer time scales the model did not effectively predict transient behaviour, as adsorption and changes in kinetic parameters were not accounted for. Modelling results showed that similar biofiltration performance for the cyclic and constant concentration biofiltration of α‐pinene is expected for biofilters operating solely in the first order kinetics regime. Poorer performance for cyclic biofilters following Monod kinetics spanning the entire kinetics range is expected as the cycle amplitude increases. The most important parameters affecting the performance of a cyclically‐operated biofilter with short cycle periods are: amplitude of cyclic fluctuations, Cg, max/Cg, relative value of the half‐saturation constant in the Monod expression, Ks, and effective diffusivity of α‐pinene in the biofilm, De. Copyright © 2005 Society of Chemical Industry  相似文献   
2.
An analysis is presented of longitudinal waves in a thin elastic column. Velocity is specified at one end, and the boundary condition at the other end is expressed in terms of a range of effective impedances of an attached structure. Propagation, reflection and interference of the waves are followed by the method of characteristics. Integration of differential equations along characteristics yields the wave-induced stress, which is then applied to problems of earthquake excitation. Numerical examples are given for recorded updown ground motion of the Kobe Earthquake.  相似文献   
3.
The growth of Li1+xMn2O4 via detonation reaction was investigated with respect to the presence of an energetic precursor, such as the metallic nitrate and the degree of confinement of the explosive charge. The detonation products were characterized by scanning electron microscopy. Powder X-ray diffraction and transmission electron microscopy were used to characterize the products. Li1+xMn2O4 with 1-2 μm spherical morphology and more uniform secondary particles, but with smaller primary particles of diameters from 20 to 60 nm and a variety of morphologies were found. The oxides produced by this cheap method affirmed the validity of detonation synthesis of nano-size powders.  相似文献   
4.
透过节能减排政策和制度看中国节能减排   总被引:2,自引:0,他引:2  
随着世界人口的增长、现代工业的高速发展,不可再生资源遭到掠夺式开采、能源消耗几何级增长、环境污染程度大大超出了生态系统的承受能力。如何解决能源短缺与污染严重对经济和社会发展的影响已经成为世界性的难题,我国同样如此。因此,加强对节能减排体系的研究,对我国节能减排工作的开展具有非常重要的意义。对我国节能减排的政策和制度进行剖析,指出了我国节能减排政策、制度以及做法中存在的问题,并提出解决的方法。  相似文献   
5.
In this paper, we propose a new hard problem, called bilateral inhomogeneous small integer solution (Bi-ISIS), which can be seen as an extension of the small integer solution problem on lattices. The main idea is that, instead of choosing a rectangle matrix, we choose a square matrix with small rank to generate Bi-ISIS problem without affecting the hardness of the underlying SIS problem. Based on this new problem, we present two new hardness problems: computational Bi-ISIS and decisional problems. As a direct application of these problems, we construct a new lattice-based key exchange (KE) protocol, which is analogous to the classic Diffie- Hellman KE protocol. We prove the security of this protocol and show that it provides better security in case of worst-case hardness of lattice problems, relatively efficient implementations, and great simplicity.  相似文献   
6.
An inverse problem in static thermo-elasticity is investigated. The aim is to reconstruct the unspecified boundary data, as well as the temperature and displacement inside a body from over-specified boundary data measured on an accessible portion of its boundary. The problem is linear but ill-posed. The uniqueness of the solution is established but the continuous dependence on the input data is violated. In order to reconstruct a stable and accurate solution, the method of fundamental solutions is combined with Tikhonov regularization where the regularization parameter is selected based on the L-curve criterion. Numerical results are presented in both two and three dimensions showing the feasibility and ease of implementation of the proposed technique.  相似文献   
7.
8.
《国际计算机数学杂志》2012,89(12):2514-2534
A new analytical method for the approximate computation of the time-dependent Green's function for the initial-boundary value problem of the three-dimensional wave equation on multi-layered bounded cylinder is suggested in this paper. The method is based on the derivation of eigenvalues and eigenfunctions for an ordinary differential equation with piecewise constant coefficients, and an approximate computation of Green's function in the form of the Fourier series with a finite number of terms relative to the orthogonal set of the derived eigenfunctions. The computational experiment confirms the robustness of the method.  相似文献   
9.
《国际计算机数学杂志》2012,89(9):1542-1555
In this paper, the upper and lower solution method and monotone iterative technique are employed to study the boundary value problem for a class of first-order impulsive ordinary differential equations with Carathéodory condition on infinite intervals. Several existence theorems are obtained.  相似文献   
10.
以不可压缩黏性流体的Navier-Stokes方程为控制方程,采用RNG k-ε湍流模型,利用VOF方法追踪运动的自由表面的方法,建立了三维数值波浪与振动柱体相互作用的模型.基于经典绕射理论验证了波浪绕固定柱体传播的数值模型的可靠性,再采用动边界技术赋予柱体振动规律,研究受控振动柱体对波浪传播的影响,并通过控制柱体初始振动相位变化,系统地给出了在柱体振动的不同初始相位下柱体前后波浪变化的规律.  相似文献   
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