全文获取类型
收费全文 | 1990篇 |
免费 | 11篇 |
国内免费 | 1篇 |
专业分类
化学 | 700篇 |
晶体学 | 67篇 |
力学 | 91篇 |
数学 | 246篇 |
物理学 | 898篇 |
出版年
2022年 | 23篇 |
2021年 | 28篇 |
2020年 | 42篇 |
2019年 | 51篇 |
2018年 | 74篇 |
2017年 | 55篇 |
2016年 | 73篇 |
2015年 | 24篇 |
2014年 | 60篇 |
2013年 | 71篇 |
2012年 | 62篇 |
2011年 | 85篇 |
2010年 | 89篇 |
2009年 | 77篇 |
2008年 | 85篇 |
2007年 | 94篇 |
2006年 | 59篇 |
2005年 | 61篇 |
2004年 | 42篇 |
2003年 | 60篇 |
2002年 | 37篇 |
2001年 | 41篇 |
2000年 | 44篇 |
1999年 | 28篇 |
1998年 | 23篇 |
1997年 | 20篇 |
1996年 | 29篇 |
1995年 | 15篇 |
1994年 | 27篇 |
1991年 | 28篇 |
1990年 | 20篇 |
1989年 | 25篇 |
1988年 | 15篇 |
1986年 | 16篇 |
1984年 | 25篇 |
1983年 | 19篇 |
1982年 | 32篇 |
1981年 | 15篇 |
1980年 | 19篇 |
1979年 | 19篇 |
1978年 | 21篇 |
1977年 | 24篇 |
1976年 | 21篇 |
1975年 | 23篇 |
1974年 | 21篇 |
1972年 | 20篇 |
1971年 | 18篇 |
1970年 | 19篇 |
1969年 | 15篇 |
1968年 | 18篇 |
排序方式: 共有2002条查询结果,搜索用时 0 毫秒
51.
52.
E. Ardashev V. Avdeichikov V. Balandin G. Bogdanova V. Dunin O. Gavrishchuk V. Golovkin S. Golovnya S. Gorokhov A. Isupov A. Kazakov A. Kholodenko A. Kiryakov E. Kokoulina A. Kutov N. Kuzmin I. Lobanov V. Nikitin Yu. Petukhov G. Pokatashkin M. Polkovnikov V. Popov S. Reznikov V. Rogov V. Ronzhin I. A. Rufanov V. Ryadovikov Yu. Tsyupa V. Volkov A. Vorobiev N. Zhidkov L. Zolin 《The European Physical Journal A - Hadrons and Nuclei》2016,52(8):261
53.
Recent measurements of the conductivity of nanoperforated graphene are interpreted in terms of edges states existing near the edge of each nanohole. The perimetric quantization of edge states should result in the formation of a quasi-equidistant ladder of quasistationary energy levels. Dirac fermions filling this ladder rotate about each nanohole in the direction determined by the valley index. It is shown that the irradiation of this system by circularly polarized terahertz radiation leads to a resonance in absorption in one of the valleys. The magnitude of absorption at the resonance frequency can be controlled by means of gate voltage. 相似文献
54.
D. A. Ivshukov I. V. Mikheev D. S. Volkov A. S. Korotkov M. A. Proskurnin 《Journal of Analytical Chemistry》2018,73(5):407-426
A two-laser dual-beam thermal lens spectrometer based on continuous-wave lasers, which implements the mode with signal back-synchronization, is developed with the aim to develop instrumentation for thermal lens spectrometry. This mode offers a potentially higher sensitivity of measurements in comparison with the lock-in mode of thermal lens measurements and variation of conditions depending on the measurement medium (solvent, or dispersed system, or solids). The wider possibilities of the back-synchronization mode in thermal lens spectrometry both for solving problems of chemical analysis and in some related fields are shown. 相似文献
55.
Yu. N. Vjunenko V. V. Kozhushko A. E. Volkov E. V. Chernyaeva 《Bulletin of the Russian Academy of Sciences: Physics》2017,81(11):1304-1309
The behavior of acoustic emission (AE) upon thermal cycling of the T–Ni alloy is studied. It is shown that AE can be used to assess working parts made of shape memory alloy. 相似文献
56.
We have performed an experimental study of the evaporation intensity for droplets in atomized-liquid flow moving through a flame of fixed height. Integral characteristics of the atomized-liquid evaporation process were evaluated. Evaporation of two water droplets moving sequentially one after the other through high-temperature combustion products is analyzed. A comparison of obtained data with available theoretical predictions is given. 相似文献
57.
58.
Physics of the Solid State - Within the Hubbard model with allowance for Hund’s and spin–orbit interactions, the concepts of thermal spin fluctuations in a strongly correlated system of... 相似文献
59.
P. G. Volkov S. I. Korobeinikov V. I. Nikolaev V. B. Sovkov 《Journal of Analytical Chemistry》2016,71(5):471-475
Possibilities of the experimental measurement and theoretical modeling of a fluorescence spectrum of a solid-anode X-ray tube are studied. A setup for the direct measurement of spectra of X-ray tubes of different types is created, spectra of a commercial BKh15 Svetlana X-ray tube are measured in wide range of anode voltages and currents. Calculations of spectra using the Ebel algorithm (Horst Ebel, 2006) with the parameters recommended in the original work ensure the satisfactory quality of the reproduction of the measured spectra, but demonstrate some statistically noticeable deviations. The optimization of model parameters ensures the improvement of the quality of simulation. 相似文献
60.
Yu. M. Shul’ga V. N. Vasilets S. A. Baskakov M. A. Smirnov V. P. Tarasov V. I. Volkov G. A. Kichigina P. P. Kushch D. P. Kiryukhin 《High Energy Chemistry》2013,47(6):291-294
By solid-state magic angle-spinning nuclear magnetic resonance spectroscopy (NMR), differential scanning calorimetry (DSC), and IR spectroscopy, polytetrafluoroethylene (PTFE) samples obtained by low-temperature (T = ?196°C) postradiation polymerization of tetrafluoroethylene (C2F4) and C2F4 mixtures with a 3D graphene material formed by the microwave exfoliation of graphite oxide films (MEGO) have been investigated. It has been shown that the melting point of PTFE in the PTFE-MEGO composite is 332.5°C, which is 8.8°C above the melting point of pure PTFE obtained under the same conditions. According to the measured values of specific enthalpy of melting ΔH m (51.5 and 45.4 J/g), the degrees crystallinity (x c) of 0.63 and 0.55 have been calculated for the pure polymer and the composite, respectively. It has been also found that none of the PTFE-containing samples examined has terminal CF3 groups typical of PTFE prepared by conventional suspension polymerization. 相似文献