全文获取类型
收费全文 | 1032篇 |
免费 | 3篇 |
学科分类
工业技术 | 1035篇 |
出版年
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 |
1968年 | 8篇 |
排序方式: 共有1035条查询结果,搜索用时 31 毫秒
1.
Theoretical Foundations of Chemical Engineering - A set of measures to establish the technology for manufacturing highly active sources of γ radiation with an active part from... 相似文献
2.
V. I. Zubkov O. V. Kucherova I. N. Yakovlev A. V. Solomonov 《Russian Microelectronics》2015,44(3):203-209
An automated system for integrated electrophysical and optical studies of semiconductor nanoheterostructures, which operates in a wide temperature range from 15 to 475 K, is designed. The setup is intended to measure the temperature and frequency admittance and electroluminescence spectra of light-emitting diode and laser chips formed on substrates of diameter up to 50.2 mm, and the distribution of parameters over the wafer. The setup includes the closed-cycle helium cryogenic station, LCR meter, and temperature controller. The characterization results of nanoheterostructures with InGaN/GaN multiple quantum wells, which are used for creating highly efficient white and blue light-emitting diodes, are presented. 相似文献
3.
Tseluikin V. N. Yakovlev A. V. 《Protection of Metals and Physical Chemistry of Surfaces》2020,56(2):374-378
Protection of Metals and Physical Chemistry of Surfaces - Nickel-based composite electrochemical coatings (CECs) modified with graphite nitrate have been obtained. Their microstructure and... 相似文献
4.
High-efficiency LEDs of 1.6–2.4 µm spectral range for medical diagnostics and environment monitoring
N. D. Stoyanov B. E. Zhurtanov A. P. Astakhova A. N. Imenkov Yu. P. Yakovlev 《Semiconductors》2003,37(8):971-984
High efficient LED structures covering the spectral range of 1.6–2.4 μm have been developed on the basis of GaSb and its solid
solutions. The electroluminescent characteristics and their temperature and current dependences have been studied. The radiative
and nonradiative recombination mechanisms and their effect on the quantum efficiency have been investigated. A quantum efficiency
of 40–60% has been obtained in the quasi-steady mode at room temperature. A short-pulse optical power of 170 mW was reached.
__________
Translated from Fizika i Tekhnika Poluprovodnikov, Vol. 37, No. 8, 2003, pp. 996–1009.
Original Russian Text Copyright ? 2003 by Stoyanov, Zhurtanov, Astakhova, Imenkov, Yakovlev. 相似文献
5.
T. I. Voronina T. S. Lagunova M. P. Mikhailova K. D. Moiseev M. A. Sipovskaya Yu. P. Yakovlev 《Semiconductors》1997,31(8):763-767
Galvanomagnetic phenomena and photoconductivity in broken-gap type-II GaInAsSb/p-InAs heterojunctions with different levels of doping of the solid solution with donor (Te) or acceptor (Zn) impurities have
been investigated. It has been determined that in such structures an electronic channel, which determines the galvanomagnetic
effects in a wide range of doping levels, is present at the heterojunction. A sharp decrease of the Hall mobility was observed
in the experimental heterostructures with a high level of doping of the epitaxial layer with an acceptor impurity. The observed
effect is due to exhaustion of the electronic channel as a result of carrier localization in potential wells at the heterojunction.
Fiz. Tekh. Poluprovodn. 31, 897–901 (August 1997) 相似文献
6.
The error of solution of Cauchy problems for systems of ordinary differential equations is estimated in the case where the
input data are approximate. It is shown how to prepare a program for computing the right-hand sides of the system automatically
and simultaneously. Diagrams are presented to illustrate the efficiency of parallelization.
__________
Translated from Kibernetika i Sistemnyi Analiz, No. 2, pp. 175–182, March–April 2007. 相似文献
7.
The characteristic features of the continuous-wave lasing spectra near 3.3 μm of multimode InAsSbP/InAsSb/InAsSbP double-heterostructure
diode lasers are shown. The observation of mode switching to longer and shorter wavelengths at cryogenic temperatures is reported.
It is shown that suppression of the longitudinal side modes closest to the main mode results in large mode jumps in energy
during mode tuning by current. The characteristics which were observed are explained by gain spectrum inhomogeneity due to
spectral hole burning in narrow-gap semiconductors. The intraband charge-carrier relaxation times in the active region are
estimated.
Fiz. Tekh. Poluprovodn. 39, 1139–1144 (September 1998) 相似文献
8.
9.
10.