全文获取类型
收费全文 | 1033篇 |
免费 | 3篇 |
专业分类
电工技术 | 8篇 |
化学工业 | 140篇 |
金属工艺 | 44篇 |
机械仪表 | 53篇 |
建筑科学 | 17篇 |
矿业工程 | 31篇 |
能源动力 | 5篇 |
水利工程 | 13篇 |
石油天然气 | 87篇 |
无线电 | 171篇 |
一般工业技术 | 264篇 |
冶金工业 | 74篇 |
原子能技术 | 70篇 |
自动化技术 | 59篇 |
出版年
2022年 | 9篇 |
2021年 | 15篇 |
2020年 | 16篇 |
2019年 | 15篇 |
2018年 | 39篇 |
2017年 | 28篇 |
2016年 | 29篇 |
2015年 | 16篇 |
2014年 | 22篇 |
2013年 | 36篇 |
2012年 | 22篇 |
2011年 | 29篇 |
2010年 | 21篇 |
2009年 | 26篇 |
2008年 | 37篇 |
2007年 | 32篇 |
2006年 | 17篇 |
2005年 | 13篇 |
2004年 | 20篇 |
2003年 | 30篇 |
2002年 | 25篇 |
2001年 | 22篇 |
2000年 | 20篇 |
1999年 | 25篇 |
1998年 | 31篇 |
1997年 | 34篇 |
1996年 | 12篇 |
1995年 | 14篇 |
1994年 | 10篇 |
1991年 | 12篇 |
1990年 | 17篇 |
1989年 | 15篇 |
1987年 | 12篇 |
1986年 | 14篇 |
1985年 | 10篇 |
1984年 | 10篇 |
1983年 | 9篇 |
1982年 | 16篇 |
1981年 | 14篇 |
1979年 | 18篇 |
1978年 | 24篇 |
1977年 | 20篇 |
1976年 | 13篇 |
1975年 | 19篇 |
1974年 | 10篇 |
1973年 | 16篇 |
1972年 | 13篇 |
1971年 | 14篇 |
1970年 | 13篇 |
1969年 | 14篇 |
排序方式: 共有1036条查询结果,搜索用时 31 毫秒
11.
12.
I. R. Tatur D. A. Yakovlev I. A. Timokhin L. R. Berezovskii G. B. Prigul'skii V. A. Lazarev V. N. Sergeev 《Chemical and Petroleum Engineering》1992,28(10):623-627
Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 10, pp. 29–31, October, 1992. 相似文献
13.
14.
Yu. S. Yakovlev 《Cybernetics and Systems Analysis》2003,39(5):765-776
Distinctive features of architectural-structural organization and use of memory networks are considered with the aim of choosing an optimal configuration in designing distributed computer systems. 相似文献
15.
Yu. Yu. Yakovlev N. N. Barashkov N. I. Kuz'min R. N. Nurmukhametov K. G. Khabarova 《Fibre Chemistry》1993,24(2):109-114
Conclusions One-, two-, and three-stage methods of preparing structurally-dyed aromatic polyamides with chromophoric fragments in the chain have been investigated.It has been shown that the molecular weight of the polymers obtained and the proportion of chromophores bound into their chain is determined by the reactivity of the starting diaminoanthraquinones.It has been found that the introduction of anthraquinone units into the poly-m-phenylene isophthalamide chain has little effect on the structure or basic physicochemical properties of the polyamide, but gives the polymer a uniform and regular coloration.Structural dyeing of poly-m-phenylene isophthalamide with fragments of 1,5-DAAQ or 4,8-DADHAQ increases the resistance of the polyamide fibres to UV irradiation.The authors express their thanks to Yu. Ya. Shavarin and N. M. Bol'bit for performance of the fibre irradiation, and also to B. A. Tsaplin for thermomechanical testing of the fibres.L. Ya. Karpov NIFKhI, Moscow. VNIISV, Tver'. Translated from Khimicheskie Volokna, No. 2, pp. 24–27, March–April, 1992. 相似文献
16.
A. V. Gorbatikov A. A. Il'inskii E. P. Krivtsov O. V. Pavlenko A. P. Yakovlev 《Measurement Techniques》1993,36(8):899-902
A set of standard equipments is considered for reproducing seismic oscillation parameters that have been developed at the Mendeleev All-Union Metrology Research Institute.Translated from Izmeritel'naya Tekhnika, No. 8, pp. 36–38, August, 1993. 相似文献
17.
T. I. Voronina T. S. Lagunova M. P. Mikhaĭlova K. D. Moiseev A. F. Lipaev Yu. P. Yakovlev 《Semiconductors》2006,40(5):503-520
The results of detailed study of the magnetotransport properties of broken-gap type II heterojunctions in a GaInAsSb/InAs(GaSb) system are reported. An electron channel with a high charge-carrier mobility (as high as 50000–60000 cm2/(V s)) is observed and studied for the first time in an isotype broken-gap p-GaInAsSb/p-InAs heterostructure. The effects of electron-channel depletion and semimetal-semiconductor transition in the case of heavy doping of the quaternary alloy with acceptors are studied. Magnetotransport properties at temperatures of 4.2–200 K are studied in detail. Data on the energy spectrum and parameters of two-dimensional charge carriers at the heteroboundary are obtained. It is ascertained experimentally that, depending on the composition, either staggered (at x = 0.85) or broken-gap (at x = 0.95) heterojunctions can be formed in the Ga1?x InxAsySb1?y /GaSb, which is confirmed by theoretical calculations. The anomalous Hall effect and negative magnetoresistance were observed in GaInAsSb/InAs:Mn grown on substrates doped heavily with Mn magnetic acceptor impurity so that the hole concentration was as high as p > 5 × 1018 cm?3; these phenomena are caused by exchange interaction of Mn ions in InAs with high-mobility charge carriers in the electron channel at the heterointerface. 相似文献
18.
For metal-insulator-semiconductor structures, a technique is described of analyzing the normalized conductance measured as a function of frequency with regard to the random variation of surface potential and the presence of electrically active states inside the insulator. Parameters are selected that are to be used in evaluating the amount by which the conductance-frequency characteristic is broadened. Analytical expressions are derived for the parameters. A method is proposed for separating the respective contributions of the tunneling and fluctuation mechanisms of the broadening. It enables one to evaluate the depth of the electrically active states and the variance of the surface potential when the two factors make comparable contributions to the inhomogeneity of the insulator-semiconductor interface. 相似文献
19.
P. N. Borutskii I. A. Volkov V. Yu. Georgievskii G. V. Stavrova A. A. Yakovlev T. G. Dolzhenkova 《Chemistry and Technology of Fuels and Oils》1990,26(8):390-392
Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 8, pp. 7–8, August, 1990. 相似文献
20.
F. I. Yakovlev 《Metal Science and Heat Treatment》1988,30(9):706-709
1. | Kinetics for -transformation are governed by the silicon content in HC, redistribution of silicon between austenite and ferrite, and cast iron heating rate. This dependence expands the transformation range and causes formation of austenite which is inhomogeneous with respect to carbon and silicon concentration. |
2. | A dependence has been established for the temperature for the start and finish of austenite formation on silicon content in HC and its heating rate. The kinetic diagram plotted makes it possible to select a schedule for high-speed heating of castings for hardening with a given silicon content. |