全文获取类型
收费全文 | 19730篇 |
免费 | 267篇 |
国内免费 | 85篇 |
专业分类
电工技术 | 707篇 |
综合类 | 89篇 |
化学工业 | 2908篇 |
金属工艺 | 1286篇 |
机械仪表 | 1605篇 |
建筑科学 | 335篇 |
矿业工程 | 307篇 |
能源动力 | 120篇 |
轻工业 | 429篇 |
水利工程 | 383篇 |
石油天然气 | 858篇 |
武器工业 | 11篇 |
无线电 | 2034篇 |
一般工业技术 | 5006篇 |
冶金工业 | 2006篇 |
原子能技术 | 421篇 |
自动化技术 | 1577篇 |
出版年
2023年 | 50篇 |
2022年 | 302篇 |
2021年 | 459篇 |
2020年 | 374篇 |
2019年 | 520篇 |
2018年 | 1081篇 |
2017年 | 1127篇 |
2016年 | 1322篇 |
2015年 | 756篇 |
2014年 | 1093篇 |
2013年 | 1426篇 |
2012年 | 1282篇 |
2011年 | 1179篇 |
2010年 | 1160篇 |
2009年 | 1341篇 |
2008年 | 1238篇 |
2007年 | 1174篇 |
2006年 | 937篇 |
2005年 | 544篇 |
2004年 | 311篇 |
2003年 | 137篇 |
2002年 | 143篇 |
2001年 | 135篇 |
2000年 | 458篇 |
1999年 | 340篇 |
1998年 | 334篇 |
1997年 | 343篇 |
1996年 | 45篇 |
1995年 | 14篇 |
1994年 | 16篇 |
1993年 | 12篇 |
1992年 | 17篇 |
1991年 | 11篇 |
1990年 | 22篇 |
1985年 | 20篇 |
1984年 | 16篇 |
1983年 | 12篇 |
1980年 | 16篇 |
1979年 | 17篇 |
1978年 | 23篇 |
1976年 | 21篇 |
1974年 | 21篇 |
1973年 | 14篇 |
1971年 | 9篇 |
1970年 | 12篇 |
1969年 | 23篇 |
1968年 | 15篇 |
1967年 | 10篇 |
1960年 | 10篇 |
1959年 | 10篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
61.
A. A. Khrushchinskii S. A. Kuten’ N. M. Budevich V. F. Minenko O. M. Zhukova N. K. Luk’yanov 《Journal of Engineering Physics and Thermophysics》2007,80(6):1170-1177
Measurements of the beta-activity of milk, serving as the main source of information on the radioactive contamination of the
environment by the iodine isotope 131I, carried out on a DP-100 radiometer in the early post-Chernobyl period (1986) in Belarus, have been mathematically simulated.
The results obtained allow the conclusion that the indicated measurements should be analyzed again with consideration for
all of the nuclides present in milk.
__________
Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 80, No. 6, pp. 102–108, November–December, 2007. 相似文献
62.
Analytical expressions for the shape of a charged drop of an incompressible liquid nonlinearly oscillating upon multimode
initial deformation have been obtained for the first time to within the third order of smallness. The second-order corrections
to oscillation frequencies are calculated depending on the spectrum of modes determining the initial deformation. The third-order
calculations show that the fundamental mode amplitude may increase due to the energy exchange with higher modes in a large
number of possible four-mode resonance interactions. 相似文献
63.
L. V. El’nikova 《Journal of Superconductivity and Novel Magnetism》2007,20(2):197-199
We describe the lyotropic liquid crystalline phase transitions in the lipid mixture dipalmitoil-PC/dilauroy-PC/cholesterol
by 3D spin-1 lattice model. The formation of nanoscale domains with the characteristic size about 300 nm was studied in experiments
on confocal fluorescence microscopy (CFM) (G. V. Feigenson and J. T. Buboltz, Biophys. J.
80, 2775 (2001)). The structure parameters of the lamellar vesicle in dipalmitoil-PC-rich phase, corresponding to these regions,
are verified by numerical Monte Carlo simulations on the lattice. We point its superconductivity analogy properties at the
region of phase stability for composition-dependent nanoscopic region. 相似文献
64.
Thin-film nickel coatings on fiber materials 总被引:1,自引:0,他引:1
L. M. Lyn’kov V. A. Bogush E. A. Senkovets S. M. Zavadskii 《Technical Physics Letters》2003,29(8):641-642
Vacuum deposition of thin films onto fiber materials is a promising method of obtaining electromagnetic screens. We have studied the structure and the electromagnetic properties of machine-knitted fabric coated with nickel by means of magnetron sputtering. When the fabric is irradiated from the metal-coated side, the reflection coefficient is higher by a factor of 1.4 as compared to the case when the same source of electromagnetic radiation is situated on the opposite side (facing the uncoated surface), while the absorption coefficient in both cases is the same. 相似文献
65.
I. I. Vintizenko V. I. Gusel’nikov A. I. Zarevich S. S. Novikov 《Technical Physics Letters》2003,29(4):294-296
Autooscillation regimes in a relativistic magnetron with external mutual coupling of cavities have been studied. It is demonstrated that the interaction of oscillations under mode competition conditions significantly increases the stability of the working oscillation mode and improves the spectral characteristics of radiation. 相似文献
66.
V. S. Bessmertnyi N. I. Min’ko P. S. Dyumina V. P. Krokhin S. V. Semenenko M. A. Lipko 《Glass and Ceramics》2005,62(11-12):386-387
A technology for the synthesis of synthetic minerals (using the example of spinels) using a low-temperature plasma flame is developed. The diagnostic properties of spinels are identified. 相似文献
67.
L. P. Podenok L. I. Sharakhovskii V. D. Shimanovich O. I. Yas’ko 《Journal of Engineering Physics and Thermophysics》1997,70(1):95-99
The influence of heat transfer processes in arc discharges on the development of thermal instability is considered. A substantial
dependence of the process of destabilization on the plasma properties is shown by the example of argon and helium arcs.
Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 70, No. 1, pp. 93–98, January–February, 1997. 相似文献
68.
Investigation of the tunneling conductivity σ
d(V) of structures made on a highly doped, narrow-gap p-type semiconductor HgCdTe reveals an abrupt increase in this quantity at voltages corresponding to the start of tunneling
into the conduction band. It is shown that the observed functions σ
d(V) cannot be described in the framework of a model based on single-particle tunneling. It is proposed that the abrupt increase
in σ
d(V) is attributable to tunneling into exciton states.
Fiz. Tekh. Poluprovodn. 32, 1069–1072 (September 1998) 相似文献
69.
V. P. Evtikhiev I. V. Kudryashov E. Yu. Kotel’nikov V. E. Tokranov A. N. Titkov I. S. Tarasov Zh. I. Alferov 《Semiconductors》1998,32(12):1323-1327
The electroluminescence and stimulated emission of lasers with one layer of InAs quantum dots (QD’s) grown in a single molecular-beam
epitaxial process on vicinal GaAs(001) surfaces misoriented in the direction [010] by 2, 4 and 6° are investigated. It is
discovered that an increase in the misorientation angle leads to a blue shift and a decrease in the full width at half maximum
(FWHM) of the electroluminescence spectrum. This effect is attributed to a decrease in the size of the quantum dots and improvement
in their size uniformity. A strong dependence of the threshold current density on the width of the spontaneous luminescence
spectrum is discovered. The room-temperature threshold current density of the lasers with one layer of quantum dots and the
spontaneous luminescence spectrum having the smallest FWHM (54 meV) equals 210 A/cm2.
Fiz. Tekh. Poluprovodn. 32, 1482–1486 (December 1998) 相似文献
70.
V. I. Dubovik V. A. Bogdanova N. A. Davletkil’deev N. A. Semikolenova O. A. Shutyak 《Semiconductors》1998,32(1):31-32
The influence of gg irradiation (60Co) of various intensities (P
γ≈1.7−7.5kGR/h) on the photoluminescence of GaAs:Te single crystals [n
0=(1.2–2.3×1018 cm−3] is investigated. Together with the known photoluminescence impurity bands (hν
max≈1.2 eV and/or hν
max≈1.35 eV) and edge band (hν
max≈1.51 eV), new bands are also observed in the spectra at hν
max≈1.3 eV and hν
max≈1.48 eV. The observed effects are attributed to radiation-stimulated ordering of the donor impurity and deep impurity centers.
Fiz. Tekh. Poluprovodn. 32, 38–39 (January 1998) 相似文献