全文获取类型
收费全文 | 2253篇 |
免费 | 6篇 |
国内免费 | 3篇 |
专业分类
电工技术 | 49篇 |
综合类 | 1篇 |
化学工业 | 388篇 |
金属工艺 | 129篇 |
机械仪表 | 120篇 |
建筑科学 | 24篇 |
矿业工程 | 40篇 |
能源动力 | 6篇 |
轻工业 | 11篇 |
水利工程 | 34篇 |
石油天然气 | 125篇 |
武器工业 | 3篇 |
无线电 | 156篇 |
一般工业技术 | 536篇 |
冶金工业 | 361篇 |
原子能技术 | 217篇 |
自动化技术 | 62篇 |
出版年
2020年 | 34篇 |
2019年 | 37篇 |
2018年 | 68篇 |
2017年 | 68篇 |
2016年 | 86篇 |
2015年 | 40篇 |
2014年 | 59篇 |
2013年 | 63篇 |
2012年 | 57篇 |
2011年 | 58篇 |
2010年 | 81篇 |
2009年 | 67篇 |
2008年 | 67篇 |
2007年 | 72篇 |
2006年 | 62篇 |
2005年 | 40篇 |
2004年 | 50篇 |
2003年 | 48篇 |
2002年 | 38篇 |
2001年 | 30篇 |
2000年 | 33篇 |
1999年 | 30篇 |
1998年 | 38篇 |
1997年 | 33篇 |
1996年 | 39篇 |
1995年 | 25篇 |
1993年 | 25篇 |
1992年 | 26篇 |
1991年 | 31篇 |
1990年 | 27篇 |
1989年 | 29篇 |
1988年 | 28篇 |
1987年 | 27篇 |
1986年 | 26篇 |
1985年 | 34篇 |
1984年 | 32篇 |
1983年 | 24篇 |
1982年 | 33篇 |
1981年 | 31篇 |
1980年 | 31篇 |
1979年 | 29篇 |
1978年 | 25篇 |
1977年 | 34篇 |
1976年 | 39篇 |
1975年 | 28篇 |
1974年 | 25篇 |
1973年 | 40篇 |
1972年 | 31篇 |
1971年 | 33篇 |
1968年 | 26篇 |
排序方式: 共有2262条查询结果,搜索用时 0 毫秒
11.
12.
13.
14.
Zhukov N. D. Mosiyash D. S. Sinev I. V. Khazanov A. A. Smirnov A. V. Lapshin I. V. 《Technical Physics Letters》2017,43(12):1124-1127
Technical Physics Letters - Current–voltage (I–V) characteristics of conductance in multigrain layers of submicron particles of silicon, gallium arsenide, indium arsenide, and indium... 相似文献
15.
V. I. Gorbatov V. F. Polev I. G. Korshunov V. P. Pilyugin A. L. Smirnov S. G. Taluts 《High Temperature》2016,54(2):294-296
Measurement data are given for the thermal diffusivity of Zr–2.5% Nb and Zr–50% Nb alloys both with the usual polycrystalline structure and with submicro- and nanocrystalline structures at high temperatures, which were determined in the automated mode using the dynamic technique of plane temperature waves. 相似文献
16.
Benz(a)pyrene content in the salt samples obtained from the borehole waters of the Krasnodar deposit
Benz(a)pyrene content in the samples of salt obtained from water ground of the Krasnodar field was assayed by means of the spectral fluorescent method. The table salt "Extra" manufactured by the Slavyansk salt-works supplying the trade network (GOST 13830-68) served as control. 15 samples (60 reference standards) were examined. It was established that 3 of 5 tested samples obtained from purified concentrated brine of water ground of the Krasnodar field contained benz(a)pyrene in an amount of 0.0351 microgram/kg up to 0.16 microgram/kg. Benz(a)pyrene (0.104 microgram/kg) was detected in 1 of 4 tested samples of the salt "Extra". It is concluded that tested salt samples obtained from concentrated brine of water ground of the Krasnodar field contain an insignificant amount of benz(a)pyrene. 相似文献
17.
18.
A method of determining the orientation of the axes of a three-component magnetometer sensor with respect to the axes of the navigation system of a ferromagnetic mobile object is considered, which eliminates the effect of the magnetization of the object on the determination of the angular position of the axes of the sensor with respect to the axes of the navigation system. 相似文献
19.
E. S. Gorkunov R. A. Savrai A. V. Makarov S. M. Zadvorkin S. V. Smirnov S. A. Rogovaya M. N. Solomein 《Russian Journal of Nondestructive Testing》2006,42(5):309-314
The influence of cyclic loading of annealed steel 45 during low-cycle fatigue on changes in its magnetic characteristics, in particular, the coercive force and the residual magnetic induction, for the major and minor magnetic-hysteresis loops and on changes in the propagation velocity of a longitudinal acoustic wave is studied. The sensitivity of the considered physical characteristics to the value of plastic deformation stored under cyclic loading in the region of both large and small strains is determined. The residual mechanical properties displayed after cyclic loading are determined, and the steady-state correlations between the coercive force measured on minor hysteresis loops in weak fields (the Rayleigh region) and the remanent clongation are obtained. The possibility of monitoring the stored plastic deformation and assessing the residual life of a material during its cyclic loading from the values of its magnetic parameters is shown. 相似文献
20.
High-purity single-crystal W and W??Nb?? have been prepared using chemical vapor transport. The impurity composition of the materials has been determined using spark source mass spectrometry and high-temperature vacuum extraction. The radial Nb profile in the alloy has been investigated by electron microscopy. 相似文献