全文获取类型
收费全文 | 1993篇 |
免费 | 98篇 |
国内免费 | 4篇 |
专业分类
电工技术 | 41篇 |
综合类 | 1篇 |
化学工业 | 449篇 |
金属工艺 | 79篇 |
机械仪表 | 55篇 |
建筑科学 | 21篇 |
矿业工程 | 21篇 |
能源动力 | 36篇 |
轻工业 | 28篇 |
水利工程 | 21篇 |
石油天然气 | 51篇 |
武器工业 | 1篇 |
无线电 | 145篇 |
一般工业技术 | 528篇 |
冶金工业 | 190篇 |
原子能技术 | 217篇 |
自动化技术 | 211篇 |
出版年
2023年 | 18篇 |
2022年 | 29篇 |
2021年 | 101篇 |
2020年 | 60篇 |
2019年 | 67篇 |
2018年 | 85篇 |
2017年 | 69篇 |
2016年 | 79篇 |
2015年 | 55篇 |
2014年 | 71篇 |
2013年 | 119篇 |
2012年 | 99篇 |
2011年 | 120篇 |
2010年 | 75篇 |
2009年 | 70篇 |
2008年 | 57篇 |
2007年 | 68篇 |
2006年 | 47篇 |
2005年 | 64篇 |
2004年 | 46篇 |
2003年 | 37篇 |
2002年 | 27篇 |
2001年 | 27篇 |
2000年 | 27篇 |
1999年 | 24篇 |
1998年 | 24篇 |
1997年 | 30篇 |
1996年 | 25篇 |
1995年 | 13篇 |
1993年 | 11篇 |
1992年 | 13篇 |
1989年 | 16篇 |
1988年 | 15篇 |
1987年 | 11篇 |
1986年 | 11篇 |
1985年 | 13篇 |
1983年 | 19篇 |
1982年 | 12篇 |
1981年 | 13篇 |
1980年 | 30篇 |
1978年 | 19篇 |
1977年 | 11篇 |
1976年 | 25篇 |
1975年 | 15篇 |
1974年 | 25篇 |
1972年 | 20篇 |
1971年 | 20篇 |
1969年 | 15篇 |
1968年 | 13篇 |
1965年 | 12篇 |
排序方式: 共有2095条查询结果,搜索用时 109 毫秒
1.
Motrenko Anastasia Simchuk Egor Khairullin Renat Inyakin Andrey Kashirin Daniil Strijov Vadim 《Multimedia Tools and Applications》2022,81(4):4877-4895
Multimedia Tools and Applications - The paper addresses the problem of human activity recognition based on the data from wearable sensors. Human activity recognition depends on a wide context of... 相似文献
2.
3.
Luca Pietrobon Lorenzo Fallarino Andreas Berger Andrey Chuvilin Flix Casanova Luis E. Hueso 《Small (Weinheim an der Bergstrasse, Germany)》2015,11(47):6295-6301
Graphene has been predicted to develop a magnetic moment by proximity effect when placed on a ferromagnetic film, a promise that could open exciting possibilities in the fields of spintronics and magnetic data recording. In this work, the interplay between the magnetoresistance of graphene and the magnetization of an underlying ferromagnetic insulating film is studied in detail. A clear correlation between both magnitudes is observed but through a careful modeling of the magnetization and the weak localization measurements, that such correspondence can be explained by the effects of the magnetic stray fields arising from the ferromagnetic insulator is found. The results emphasize the complexity arising at the interface between magnetic and 2D materials. 相似文献
4.
5.
Andrey A. Buglak Alexey V. Samokhvalov Anatoly V. Zherdev Boris B. Dzantiev 《International journal of molecular sciences》2020,21(22)
Aptamers are nucleic acid analogues of antibodies with high affinity to different targets, such as cells, viruses, proteins, inorganic materials, and coenzymes. Empirical approaches allow the design of in vitro aptamers that bind particularly to a target molecule with high affinity and selectivity. Theoretical methods allow significant expansion of the possibilities of aptamer design. In this study, we review theoretical and joint theoretical-experimental studies dedicated to aptamer design and modeling. We consider aptamers with different targets, such as proteins, antibiotics, organophosphates, nucleobases, amino acids, and drugs. During nucleic acid modeling and in silico design, a full set of in silico methods can be applied, such as docking, molecular dynamics (MD), and statistical analysis. The typical modeling workflow starts with structure prediction. Then, docking of target and aptamer is performed. Next, MD simulations are performed, which allows for an evaluation of the stability of aptamer/ligand complexes and determination of the binding energies with higher accuracy. Then, aptamer/ligand interactions are analyzed, and mutations of studied aptamers made. Subsequently, the whole procedure of molecular modeling can be reiterated. Thus, the interactions between aptamers and their ligands are complex and difficult to understand using only experimental approaches. Docking and MD are irreplaceable when aptamers are studied in silico. 相似文献
6.
M. L. Orlov 《Semiconductors》2008,42(3):339-345
The effect of nonlinearity of the drift velocity of free charge carriers and the gradient-and concentration-related nonlinearities in the power-voltage sensitivity of a field-effect transistor with a short channel are studied theoretically. Theoretical results are compared with experimental data on the detection of terahertz radiation. It follows from the comparison that, in order to gain deeper insight into observed systematic features in the analysis of high-frequency characteristics of the transistor, one has to take into account some other mechanisms of the current nonlinearity, in addition to the plasma-related nonlinearity. 相似文献
7.
P. S. Orlov 《Surface Engineering and Applied Electrochemistry》2007,43(1):40-43
This article describes a model of hydrogen diffusion processes, shows the influence of protective cathode stations on the hydrogen saturation of underground-pipeline metal, and suggests a new method to find hydrogen-saturated sections in underground steel gas-supply systems. 相似文献
8.
Application of hydrocarbon mixtures enables the creation of simple, reliable and durable refrigerating and cryogenic Joule–Thomson micro coolers for the temperature range of −73 to −183 °C. The temperature, thermal, power and hydraulic performances of a series of prototypes are presented. The results of tests demonstrate that small, single stage, sealed, lubricated compressors can be applied to these purposes. The start up and steady operation hydraulic performance of those machines are quite similar to the performance of domestic refrigerators. The last, together with the fact that in the studied micro coolers the lubricated compressors are used at temperatures down to −183 °C, ensures a large resource of operation. That is just the reason that holds out a hope for prospects in a broad field of applications for the studied prototypes, despite their lower power performances in contrast to gas micro coolers. 相似文献
9.
Activation energy of electron-stimulated quenching of the photoluminescence of n-type porous silicon
The degradation of photoluminescence of porous silicon by kilovolt electrons and the mechanism and activation energy of this
process have been investigated. Quantitative relations between the integral intensity of the photoluminescence and the irradiation
dose and substrate temperature are obtained. The mechanism of the process is discussed and its activation energy is determined.
Pis’ma Zh. Tekh. Fiz. 23, 44–50 (September 26, 1997) 相似文献
10.