全文获取类型
收费全文 | 8659篇 |
免费 | 753篇 |
国内免费 | 476篇 |
专业分类
电工技术 | 206篇 |
综合类 | 774篇 |
化学工业 | 2361篇 |
金属工艺 | 727篇 |
机械仪表 | 458篇 |
建筑科学 | 1333篇 |
矿业工程 | 255篇 |
能源动力 | 261篇 |
轻工业 | 227篇 |
水利工程 | 207篇 |
石油天然气 | 166篇 |
武器工业 | 91篇 |
无线电 | 340篇 |
一般工业技术 | 1635篇 |
冶金工业 | 305篇 |
原子能技术 | 184篇 |
自动化技术 | 358篇 |
出版年
2024年 | 39篇 |
2023年 | 131篇 |
2022年 | 241篇 |
2021年 | 258篇 |
2020年 | 263篇 |
2019年 | 259篇 |
2018年 | 235篇 |
2017年 | 318篇 |
2016年 | 279篇 |
2015年 | 295篇 |
2014年 | 460篇 |
2013年 | 576篇 |
2012年 | 545篇 |
2011年 | 616篇 |
2010年 | 461篇 |
2009年 | 516篇 |
2008年 | 475篇 |
2007年 | 521篇 |
2006年 | 478篇 |
2005年 | 409篇 |
2004年 | 389篇 |
2003年 | 307篇 |
2002年 | 279篇 |
2001年 | 252篇 |
2000年 | 213篇 |
1999年 | 174篇 |
1998年 | 160篇 |
1997年 | 152篇 |
1996年 | 113篇 |
1995年 | 81篇 |
1994年 | 80篇 |
1993年 | 63篇 |
1992年 | 71篇 |
1991年 | 46篇 |
1990年 | 26篇 |
1989年 | 35篇 |
1988年 | 11篇 |
1987年 | 12篇 |
1986年 | 10篇 |
1985年 | 12篇 |
1984年 | 2篇 |
1983年 | 5篇 |
1982年 | 3篇 |
1981年 | 5篇 |
1980年 | 3篇 |
1979年 | 5篇 |
1964年 | 1篇 |
1955年 | 2篇 |
1951年 | 1篇 |
排序方式: 共有9888条查询结果,搜索用时 15 毫秒
11.
浅谈门式刚架轻型钢结构厂房中抗风柱的设置 总被引:1,自引:0,他引:1
通过对抗风柱上下端的节点几种形式进行分析比较,提出建议性的节点连续方式。 相似文献
12.
The iterative finite element model, in which an element is used to represent a single particle, is generated to analyze the
global behavior of multiple-material aggregates of materially nonlinear viscoplastic particles. The generalized Maxwell model
is used to define four types of specific nonlinear viscoplastic materials, which are the elasto visco-plastic matter with
linear viscosity, the plasto visco-plastic material with linear viscosity, the elasto visco-plastic media with nonlinear viscosity,
and the plasto visco-plastic media with nonlinear viscosity. The theory and relevant penalty iterative algorithm are developed
to analyze the four representative mixed granular systems consisting of materially nonlinear viscous particles. To verify
precision of stress calculation, solutions of an axis-symmetric radial flow problem are compared with results of the literature
and they are in a great agreement. The results present here provide significant insight into the fundamental behavior of granular
media under compaction conditions, including prediction of the overall aggregates stress-strain response. 相似文献
13.
14.
In this paper, we report on a novel family of monodisperse thermo‐sensitive core–shell hydrogel microspheres that is featured with high monodispersity and positively thermo‐responsive volume phase transition characteristics with tunable swelling kinetics, i.e., the particle swelling is induced by an increase rather than a decrease in temperature. The microspheres were fabricated in a three‐step process. In the first step, monodisperse poly(acrylamide‐co‐styrene) seeds were prepared by emulsifier‐free emulsion polymerization. In the second step, poly(acrylamide) or poly[acrylamide‐co‐(butyl methacrylate)] shells were fabricated on the microsphere seeds by free radical polymerization. In the third step, the core–shell microspheres with poly‐ (acrylamide)/poly(acrylic acid) based interpenetrating polymer network (IPN) shells were finished by a method of sequential IPN synthesis. The proposed monodisperse core–shell microspheres provide a new mode of the phase transition behavior for thermo‐sensitive “smart” or “intelligent” monodisperse micro‐actuators that is highly attractive for targeting drug delivery systems, chemical separations, sensors, and so on. 相似文献
15.
扫描电子显微研究表明,化学汽相沉积的金刚石薄膜中晶粒大小比较均匀。但随着沉积时间和薄膜厚度的增加,晶粒逐渐变大,且每一层内,存在少量的大金刚石颗粒,讨论了晶粒尺寸变化和大晶粒形成的原因和机制。 相似文献
16.
《Drying Technology》2007,25(5):831-839
Residence time distributions for an aqueous solution of 10% sodium chloride in a spouted bed dryer of inert particles were determined using the stimulus-response technique. Glass and polyethylene beads with diameters 2.6 and 3.4 mm were used as inert bodies in a cylindrical column of 14.0 cm diameter and 60° conical base. The effects of inert bodies load, air, and paste flow rates on the mean residence times and RTD were determined following 23 factorial designs. The RTD could be correlated to the perfect mixing cell model with R2 varying from 0.8684 to 0.9815. The mean residence times in CSBD varied from 10.8 to 13.9 and 10.7 to 13.3 min for glass and polyethylene beads, respectively. For both inert particles, mean residence times increased with bed height and decreased with paste feed rates. Also, terms of interaction among the factors were significant in some cases, showing a complex behavior of paste residence times. Equations obtained by response surface regression could predict mean residence times on glass and polyethylene beads with deviations lower than ±10%. 相似文献
17.
Stratis V. Sotirchos 《Chemical Engineering Communications》1985,39(1):259-276
The effects of thermal radiation on the pseudosteady state and transient behavior of porous char particles exposed to an oxygen containing environment are investigated. The numerical simulation results show that particles that do not interchange radiant energy with their environment are characterized by wider ambient temperature regions where multiple steady states exist, higher combustion rates, and lower burning times 相似文献
18.
A mathematical model for the drying rate of granular particles in a multistage inclined fluidized bed(IFB) is presented from the standpoint of simultaneous heat and mass transfer, with taking the effect of mechanical vibration added vertically into consideration.
Steady-state distributions for the temperatures and concentrations of the particles and the heating gas, and for the moisture content of the particles are numerically calculated based on the present model. The calculated results show fairly good agreement with the experimental data, which were obtained from the drying experiments of brick particles in a three-stage IFB using comparatively low temperature air(40-60°C) as the heating gas.
It has been found within the range of the experimental conditions employed that, the mechanical vibration added vertically enhances the over-all drying rate of the particles and its effect can be considered equivalent to an increase in the air velocity. 相似文献
Steady-state distributions for the temperatures and concentrations of the particles and the heating gas, and for the moisture content of the particles are numerically calculated based on the present model. The calculated results show fairly good agreement with the experimental data, which were obtained from the drying experiments of brick particles in a three-stage IFB using comparatively low temperature air(40-60°C) as the heating gas.
It has been found within the range of the experimental conditions employed that, the mechanical vibration added vertically enhances the over-all drying rate of the particles and its effect can be considered equivalent to an increase in the air velocity. 相似文献
19.
Recent developments of high-performance NEOMAX magnets 总被引:6,自引:0,他引:6
For further improvement in achieving extremely high magnetic properties of Nd- Fe- B sintered magnets, extensive investigation
has been done to densify the magnet up to the theoretical value, to increase the volume fraction of the Nd
2Fe14B matrix phase, and to achieve a high degree of alignment. By controlling chemical composition and the amount of constituent
phases,improving particle size distribution, and adopting the isostatic pressing method to get better alignment of fine particles,
we have succeeded in obtaining a high-performance magnet having residual flux density (Br) of 1.495 T (14.95 kG), maximum energy product [(BH)max] of 431 kj/m3 (54.2 MGOe), and intrinsic coercivity (iHc) of 845 kA/m (10.62 kOe). 相似文献
20.
羰基铁类随机混合吸波材料等效电磁参数的计算 总被引:3,自引:0,他引:3
本文为计及多重散射偶极子间的相互作用,引入参量εh和μh,导得一组公式。它不仅能计算铁氧体类也能计算羰基铁类的随机混合吸波材料的等效电磁参数,均与实验结果吻合良好。 相似文献