全文获取类型
收费全文 | 443篇 |
免费 | 0篇 |
学科分类
工业技术 | 443篇 |
出版年
2022年 | 3篇 |
2021年 | 6篇 |
2020年 | 5篇 |
2019年 | 18篇 |
2018年 | 13篇 |
2017年 | 8篇 |
2016年 | 11篇 |
2015年 | 7篇 |
2014年 | 10篇 |
2013年 | 14篇 |
2012年 | 16篇 |
2011年 | 12篇 |
2010年 | 6篇 |
2009年 | 13篇 |
2008年 | 17篇 |
2007年 | 11篇 |
2006年 | 14篇 |
2005年 | 11篇 |
2004年 | 7篇 |
2003年 | 9篇 |
2001年 | 5篇 |
2000年 | 9篇 |
1999年 | 11篇 |
1998年 | 44篇 |
1997年 | 19篇 |
1996年 | 18篇 |
1995年 | 7篇 |
1994年 | 8篇 |
1993年 | 8篇 |
1992年 | 3篇 |
1990年 | 3篇 |
1989年 | 4篇 |
1987年 | 3篇 |
1986年 | 4篇 |
1983年 | 3篇 |
1982年 | 5篇 |
1981年 | 3篇 |
1980年 | 3篇 |
1979年 | 5篇 |
1978年 | 6篇 |
1977年 | 5篇 |
1976年 | 6篇 |
1975年 | 3篇 |
1974年 | 6篇 |
1973年 | 3篇 |
1972年 | 9篇 |
1971年 | 9篇 |
1969年 | 2篇 |
1967年 | 3篇 |
1957年 | 2篇 |
排序方式: 共有443条查询结果,搜索用时 0 毫秒
1.
2.
I. I. Novikov N. Yu. Gordeev M. V. Maksimov Yu. M. Shernyakov E. S. Semenova A. P. Vasil’ev A. E. Zhukov V. M. Ustinov G. G. Zegrya 《Semiconductors》2005,39(4):481-484
Semiconductor laser heterostructures containing five and ten sheets of InAs/GaAs QDs on GaAs substrates, with an emission wavelength of ~1.3 μm, have been studied. Dependences of the nonradiative lifetime and effective Auger coefficient in QDs are obtained from an analysis of temperature and current dependences of the efficiency of spontaneous radiative recombination. The zero-threshold Auger recombination channel in QDs is shown to dominate at low (below 200 K) temperature, whereas at higher temperatures the quasithreshold channel becomes dominant. The effective 3D Auger coefficient is estimated in the approximation of a spherical QD, and a good agreement with the experimental data is obtained. 相似文献
3.
4.
VI Korol''kov VP Krotov V Konvertino P Le?tem EV Trambovetski? J Fanton R Krisman IuV Gordeev D Evert AM Nosovski? J Konnolli 《Canadian Metallurgical Quarterly》1998,32(3):30-37
Medical practice guidelines are being developed rapidly and advocated as a crucial component in transforming and improving the delivery of health care services. However, little is known about the ability of hospitals to institute guidelines outside of experimental settings. This article approaches guideline implementation from the viewpoint of process innovation assimilation and presents specific recommendations for organizational tactics leading to successful implementation of practice guidelines. 相似文献
5.
VNIISV, Tver'. Institute of Chemical Physics, Moscow. Translated from Khimicheskie Volokna, No. 3, pp. 42–43, May–June, 1992. 相似文献
6.
Kulyukhin S. A. Krasavina E. P. Gordeev A. V. 《Theoretical Foundations of Chemical Engineering》2021,55(5):1056-1061
Theoretical Foundations of Chemical Engineering - The possibility of removing U(VI) from aqueous solutions using layered double hydroxides of Mg and Al, which contain β-cyclodextrin... 相似文献
7.
Arguments are presented for the necessity of integrating diagnostics and supervision in technological machines. An example of integrated diagnostics and supervision of the machine tool main drive, based on an expert system and neural network, is shown. Problems of intelligent thermal displacement supervision and questions related to practical supervision of machining centres are presented. 相似文献
8.
V. F. Shamrai Yu. Yu. Klochkova E. M. Lazarev A. S. Gordeev V. P. Sirotinkin 《Russian Metallurgy (Metally)》2013,2013(9):699-705
The texture and microstructure of the central layers in alloy 1469 sheets and the orientations of hardening T1-phase precipitates are studied by X-ray diffraction, optical microscopy, and transmission electron microscopy. These studies and X-ray diffraction performed in asymmetric geometry demonstrate that the texture of the material is formed by the broadening of the orientations located near a β skeleton line. The contribution to an X-ray diffraction pattern from two of the four possible versions of the orientations of hardening T1-phase plates that are caused by a brass-type texture component in the matrix and the orientation relationships between the matrix and the T1-phase lattices is separated. The microstructure of the sheets is shown to have a two-level character. It is formed by extended (up to several millimeters long) regions fragmented into grains several microns in size. The structural states of the sheet material are discussed in their relation to the crystallographic character of fatigue crack propagation. 相似文献
9.
P. N. Brunkov V. V. Goncharov M. E. Rudinsky A. A. Gutkin N. Yu. Gordeev V. M. Lantratov N. A. Kalyuzhnyy S. A. Mintairov R. V. Sokolov S. G. Konnikov 《Semiconductors》2013,47(9):1170-1173
The method of scanning Kelvin-probe microscopy is used to show that the effect of triboelectrification is observed when the tip of an atomic-force microscope interacts with the surface of n-GaAs epitaxial layers. The sign of the change in the potential indicates that the sample surface after triboelectrification becomes more negative. The observed specific features of the phenomena can be attributed to the thermally activated generation of point defects in the vicinity of the sample surface due to deformation caused by the tip. 相似文献
10.
Vanyagin A. V. Gordeev B. A. Okhulkov S. N. Titov D. Yu. 《Russian Engineering Research》2021,41(8):719-721
Russian Engineering Research - The interaction of an ultrasonic probe with a vibrating boundary surface is considered in a quasi-static approximation. A model of boundary-problem type is expressed... 相似文献