全文获取类型
收费全文 | 5036篇 |
免费 | 551篇 |
国内免费 | 351篇 |
专业分类
电工技术 | 286篇 |
综合类 | 740篇 |
化学工业 | 702篇 |
金属工艺 | 211篇 |
机械仪表 | 308篇 |
建筑科学 | 487篇 |
矿业工程 | 99篇 |
能源动力 | 176篇 |
轻工业 | 420篇 |
水利工程 | 177篇 |
石油天然气 | 175篇 |
武器工业 | 77篇 |
无线电 | 447篇 |
一般工业技术 | 888篇 |
冶金工业 | 99篇 |
原子能技术 | 34篇 |
自动化技术 | 612篇 |
出版年
2024年 | 14篇 |
2023年 | 49篇 |
2022年 | 71篇 |
2021年 | 114篇 |
2020年 | 137篇 |
2019年 | 127篇 |
2018年 | 127篇 |
2017年 | 183篇 |
2016年 | 194篇 |
2015年 | 203篇 |
2014年 | 247篇 |
2013年 | 299篇 |
2012年 | 356篇 |
2011年 | 352篇 |
2010年 | 263篇 |
2009年 | 299篇 |
2008年 | 336篇 |
2007年 | 353篇 |
2006年 | 313篇 |
2005年 | 286篇 |
2004年 | 252篇 |
2003年 | 211篇 |
2002年 | 194篇 |
2001年 | 181篇 |
2000年 | 156篇 |
1999年 | 110篇 |
1998年 | 101篇 |
1997年 | 83篇 |
1996年 | 71篇 |
1995年 | 37篇 |
1994年 | 43篇 |
1993年 | 34篇 |
1992年 | 29篇 |
1991年 | 16篇 |
1990年 | 25篇 |
1989年 | 14篇 |
1988年 | 11篇 |
1987年 | 8篇 |
1986年 | 8篇 |
1985年 | 11篇 |
1984年 | 5篇 |
1983年 | 7篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1959年 | 1篇 |
1955年 | 1篇 |
1951年 | 1篇 |
排序方式: 共有5938条查询结果,搜索用时 437 毫秒
11.
CAO Wei-feng WANG Wen-boBeijing University of Posts Telecommunications Beijing P.R. China 《中国邮电高校学报(英文版)》2005,12(4)
1IntroductionCurrently,smart antenna technology can greatly en-hance system performance and i mprove the system ca-pacity so that it has been considered as a keytechnologyinthe third generation wireless communicationsystems .The researches on channel model , beamforming algo-rithms and receive algorithms have been widely carriedout and a great many of proposition have beensubmittedtothe 3th Generation Project Partner (3GPP) . Fromthe viewpoint of link-level and system-level research,many asp… 相似文献
12.
均匀设计法分析制备过程对钴钼硫化物催化剂机械强度的影响 总被引:1,自引:1,他引:0
建立了CoMoP/Al2O3加氢精制催化剂机械强度及其可靠性在制备过程中的数学模型,采用均匀设计考察了浸渍、干燥、煅烧、硫化4个制备过程中,浸渍时间、干燥温度、干燥时间、煅烧温度、煅烧时间、硫化温度和硫化升温速率7个实验因子对催化剂强度均值、Weibull模量的影响,同时考察了这些因素对颗粒密度的影响。方差分析表明所有模型都是充足的。实验结果表明,硫化过程是影响催化剂强度均值的主要过程。在实验范围内提高硫化温度、降低硫化时的升温速率有利于提高催化剂的强度。影响催化剂Weibull模量的因素主要为各个制备过程的交互效应。要提高催化剂强度的可靠性就必须全面考虑催化剂制备的各个过程,特别是各个制备过程的交互效应。 相似文献
13.
In this paper, we study a three-dimensional axisymmetric boundary-value problem of a slender cylinder composed of a nonlinearly elastic material subjected to an axial force. Starting from the field equations, after a transformation and proper scalings, we identify a small variable and two small parameters, which characterize the present problem. Then, by an approach involving compound series-asymptotic expansions, a nonlinear ODE is derived, which governs the axial strain (the first-term in the series expansion). By imposing the zero radial displacement conditions at two ends, we manage to get the analytical solution of the axial strain, from which all other physical quantities can be deduced and thus the three-dimensional displacement field can be determined. Graphical results are presented, which show that there are two boundary layers near the two ends while the middle part is in a state of almost uniform extension. The asymptotic structure of the analytical solution is derived, which offers clear explanations to the structure of the deformed configuration and shows that the thickness of both boundary layers is of the order of the radius. We also point out the relevance of the present results to the St. Venant’s problem. In particular, we obtain the explicit uniformly-valid exponentially small error term, when the obtained deformed configuration is compared to the configuration of a uniform extension. 相似文献
14.
G. MENEGHETTI P. LAZZARIN 《Fatigue & Fracture of Engineering Materials & Structures》2007,30(2):95-106
The paper presents an expression useful to estimate the notch stress intensity factor (NSIF) from finite element analyses carried out by using a mesh pattern with a constant element size. The evaluation of the NSIF from a numerical analysis of the local stress field usually requires very refined meshes and then large computational effort. The usefulness of the presented expression is that (i) only the elastic peak stress numerically evaluated at the V‐notch tip is needed and no longer the whole stress–distance set of data; (ii) the adopted meshes are rather coarse if compared to those necessary for the evaluation of the whole local stress field. The proposed expression needs the evaluation of a virtual V‐notch tip radius, i.e. the radius which would produce the same elastic peak stress than that calculated by FEM at the sharp V‐notch tip by means of a given mesh pattern. Once such a radius has been theoretically determined for a given geometry, the expression can be applied in a wide range of notch depths and opening angles. 相似文献
15.
16.
In order to develop a basic electrode with low fume and good usability, a uew slag system has been designed after analyzing several basic electrode slag systems. Then in view of uniform design method, arranging the experiment points by it, the influenced laws of the uew system coating compouents on the arc stability had been searched. In the formula, niue coating compouents were taken as independent variables and they were divided into six levels in all twenty-four experiments. The arc stability was taken as function and taken down the data when welding and then put them into the computer to be processed statistically. The analysis results give the mathematical model and trend diagrams between independent variables and the function. They indicate that the effects of many coating compouents on the arc stability are in the mutual form. The mutual effects between CaCO3 and BaF2, BaF2 and BaCO3 , increases the arc stability separately. While the mutual effects between CaF2 and iron powder, the square item of iron powder itself decreases the arc stability separately. 相似文献
17.
F-X域粘弹性波动方程保幅偏移 总被引:6,自引:1,他引:5
提出了一种利用粘弹性声波波动方程进行偏移的新方法。其基本思路是,修改成像条件,使修改后的成像方程中考虑振幅补偿,然后利用粘弹性、单程波动方程在F-X域对震源和接收点波场进行延拓,进而完成散射、透射等补偿。理论数据处理和实际地震资料处理表明,该方法理论基础可靠,处理效果明显,能较好地解决实际地质问题。 相似文献
18.
19.
在鱼罐喷粉预处理水模实验数据的基础上,进一步利用线性回归确定各工艺操作参数对喷吹基本参数(均混时间、粉剂穿透比和粉剂停留时间)的影响,得出各传输动力学基本参数的函数关系式。 相似文献
20.
凌树森 《理化检验(物理分册)》1998,34(3):15-18,36
对圆杆在线弹性阶段,弹-塑性阶段和全塑性阶段的扭转剪应力的计算公式作了分析,并推导了在材料的应力-应变关系(τ-γ关系)不服从虎克定律时,扭转真实剪应力的计算公式。文中对扭转强度计算公式的来源,物理含义及其都作了详细的说明。这对执行和理解国家GB10128-88《金属室温扭转试验方法》是有益的,而且对高校中材料力学的教学具有一定的参考价值。 相似文献