全文获取类型
收费全文 | 216篇 |
免费 | 0篇 |
专业分类
电工技术 | 1篇 |
化学工业 | 35篇 |
金属工艺 | 13篇 |
机械仪表 | 4篇 |
矿业工程 | 3篇 |
石油天然气 | 41篇 |
无线电 | 41篇 |
一般工业技术 | 58篇 |
冶金工业 | 10篇 |
原子能技术 | 10篇 |
出版年
2021年 | 1篇 |
2020年 | 2篇 |
2019年 | 3篇 |
2018年 | 1篇 |
2017年 | 7篇 |
2016年 | 6篇 |
2015年 | 2篇 |
2014年 | 9篇 |
2013年 | 10篇 |
2012年 | 6篇 |
2011年 | 15篇 |
2010年 | 9篇 |
2009年 | 8篇 |
2008年 | 13篇 |
2007年 | 13篇 |
2006年 | 5篇 |
2005年 | 2篇 |
2004年 | 2篇 |
2003年 | 6篇 |
2002年 | 5篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1999年 | 3篇 |
1998年 | 2篇 |
1997年 | 4篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1992年 | 1篇 |
1991年 | 2篇 |
1990年 | 4篇 |
1989年 | 4篇 |
1988年 | 1篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1983年 | 5篇 |
1982年 | 4篇 |
1981年 | 1篇 |
1980年 | 7篇 |
1979年 | 3篇 |
1978年 | 5篇 |
1977年 | 6篇 |
1976年 | 11篇 |
1975年 | 5篇 |
1974年 | 2篇 |
1973年 | 2篇 |
1972年 | 2篇 |
1971年 | 1篇 |
1970年 | 2篇 |
1968年 | 1篇 |
排序方式: 共有216条查询结果,搜索用时 15 毫秒
211.
G. A. Bordovskii R. A. Kastro A. V. Marchenko S. A. Nemov P. P. Seregin 《Semiconductors》2007,41(12):1408-1412
The ratio between the content of bivalent and tetravalent tin atoms in the (As2Se3)1 − z
(SnSe)
z − x
(GeSe)
x
glasses depends on the rate of quenching of the alloy and on its temperature. Irradiation of these glasses with γ-ray photons
brings about a partial oxidation of bivalent tin with formation of amorphous (finely divided) SnO2 phase blocked by the glass, so that the physicochemical properties of the glasses (density, microhardness, glassformation
temperature, and the electrical-conductivity activation energy) are virtually unaffected by irradiation.
Original Russian Text ? G.A. Bordovskii, R.A. Kastro, A.V. Marchenko, S.A. Nemov, P.P. Seregin, 2007, published in Fizika
i Tekhnika Poluprovodnikov, 2007, Vol. 41, No. 12, pp. 1429–1433. 相似文献
212.
Anton Seregin Oualid Hammi Donglin Wang Mohamed Helaoui Fadhel Ghannouchi 《Wireless Communications and Mobile Computing》2015,15(1):147-154
Narrow band interference (NBI) deteriorates the quality of the spectrum, leading to a poorer performance of modern universal mobile telecommunication system (UMTS) spread spectrum systems. The linear prediction algorithm is one of the most significant techniques to overcome NBI and enhance the performance of UMTS systems. In this paper, a modified linear prediction algorithm is proposed for NBI suppression in a conditionally stationary environment. This modification improves the error energy estimation in the auto‐regression model of the linear prediction. The convergence of the proposed algorithm is evaluated, and its robustness is verified using Kullback–Leibler metrics for conditionally stationary NBI signals. Computer simulations are carried out, and the obtained results demonstrate the performance of the proposed algorithm and its compliance with UMTS protocols. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
213.
It is shown that the charge state of the 73Ge antisite defect that arises in anionic sublattices of PbS, PbSe, and PbTe after radioactive transformation of 73As does not depend on the position of the Fermi level, whereas the 73Ge center in cationic sublattices of PbS and PbSe represents a two-electron donor with the negative correlation energy: the Mössbauer spectrum for the n-type samples corresponds to the neutral state of the donor center (Ge2+), while this spectrum corresponds to the doubly ionized state (Ge4+) of the center in the p-type samples. In partially compensated PbSe samples, a fast electron exchange between the neutral and ionized donor centers is realized. It is shown by the method of Mössbauer spectroscopy for the 119Sn isotope that the germanium-related energy levels are located higher than the levels formed in the band gap of these semiconductors by the impurity tin atoms. 相似文献
214.
R. S. Vladimirova S. D. Mal’ginova R. A. Doroshenko S. V. Seregin 《The Physics of Metals and Metallography》2007,103(6):571-575
Numerical methods have been used to study the shapes of NMR absorption lines of domain walls (DWs) in a (110) plate of yttrium iron garnet upon the magnetization along the \([\bar 1 10]\) direction. NMR spectra obtained from 57Fe nuclei located in tetrahedral and octahedral positions in Bloch and Néel walls in a longitudinal and transverse radiofrequency fields have been studied. The dependences of the frequencies of the NMR absorption maxima of DWs on the magnitude of the applied magnetic field permit one to unambiguously determine the type of rotation of magnetization in the transition layer. It is shown that by changing the conditions of excitation of oscillations of the radiofrequency field, signals from nuclei located in various layers of the DW can be obtained. 相似文献
215.
S. A. Nemov F. S. Nasredinov P. P. Seregin N. P. Seregin E. S. Khuzhakulov 《Semiconductors》2005,39(3):289-292
The dependence of the concentration of two-electron tin centers in the intermediate charge state Sn3+ in PbS on the correlation energy is obtained using the Gibbs distribution. It is shown that this state cannot be observed by Mössbauer spectroscopy on an 119Sn isotope (due to insufficient sensitivity), but it can manifest itself in the temperature dependence of the hole density in Pb1?x?ySnxNayS solid solutions. 相似文献
216.
S. A. Nemov Yu. V. Kozhanova P. P. Seregin N. P. Seregin D. V. Shamshur 《Semiconductors》2003,37(9):1061-1062
Mössbauer spectroscopy of the 119Sn isotope has shown that the superconducting transition in (Pb1?xSnx)1?zInzTe solid solutions is not accompanied by a change in the local symmetry of tin atoms or in their electronic structure. 相似文献