全文获取类型
收费全文 | 1213篇 |
免费 | 28篇 |
国内免费 | 1篇 |
专业分类
化学 | 567篇 |
晶体学 | 25篇 |
力学 | 33篇 |
综合类 | 2篇 |
数学 | 155篇 |
物理学 | 460篇 |
出版年
2023年 | 12篇 |
2022年 | 28篇 |
2021年 | 54篇 |
2020年 | 65篇 |
2019年 | 57篇 |
2018年 | 42篇 |
2017年 | 42篇 |
2016年 | 45篇 |
2015年 | 34篇 |
2014年 | 41篇 |
2013年 | 57篇 |
2012年 | 35篇 |
2011年 | 53篇 |
2010年 | 55篇 |
2009年 | 36篇 |
2008年 | 38篇 |
2007年 | 45篇 |
2006年 | 30篇 |
2005年 | 36篇 |
2004年 | 26篇 |
2003年 | 33篇 |
2002年 | 24篇 |
2001年 | 24篇 |
2000年 | 36篇 |
1999年 | 18篇 |
1998年 | 17篇 |
1997年 | 13篇 |
1996年 | 14篇 |
1995年 | 6篇 |
1994年 | 8篇 |
1992年 | 11篇 |
1991年 | 12篇 |
1990年 | 12篇 |
1989年 | 10篇 |
1988年 | 9篇 |
1987年 | 10篇 |
1986年 | 6篇 |
1984年 | 11篇 |
1981年 | 7篇 |
1980年 | 7篇 |
1979年 | 10篇 |
1978年 | 10篇 |
1977年 | 9篇 |
1976年 | 9篇 |
1975年 | 7篇 |
1974年 | 8篇 |
1971年 | 8篇 |
1968年 | 9篇 |
1967年 | 9篇 |
1965年 | 7篇 |
排序方式: 共有1242条查询结果,搜索用时 15 毫秒
1.
2.
I. L. Eremenko M. A. Golubnichaya S. E. Nefedov A. A. Sidorov D. A. Nesterenko N. P. Konovalova L. M. Volkova L. T. Eremenko 《Russian Chemical Bulletin》1997,46(9):1595-1598
Thetrans-[Pt(NC5H4C(O)NHC2H4ONO2)2Cl2] complex (2) was prepared by the reaction of nicorandyl (N-nitroethoxynicotinamide), which is widely used in cardiology, with K2PtCl4 in water. The structure of2 was established by X-ray structural analysis. It was found that complex2 exhibits high antitumor activity, in particular, antimetastatic activity, unlike the analogous CuII complex with bromine atoms.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1672–1675, September, 1997. 相似文献
3.
4.
A. E. Blinov V. E. Blinov A. E. Bondar A. D. Bukin V. R. Groshev S. G. Klimenko G. M. Kolachev A. P. Onuchin V. S. Panin I. Ya. Protopopov A. G. Shamov V. A. Sidorov Yu. I. Skovpen A. N. Skrinsky V. A. Tayursky V. I. Telnov Yu. A. Tikhonov G. M. Tumaikin A. E. Undrus A. I. Vorobiov V. N. Zhilich 《Zeitschrift fur Physik C Particles and Fields》1992,53(1):33-39
The process γγ→π+π? was measured using the detector MD-1 at VEPP-4. The two-photon reactionse + e ?, μ+ μ? and π+ π? pair production were separated using scintillation counters, Cherenkov counters and shower-range chambers. A radiation widthГ γγ(f 2(1270))=3.1±0.35±0.35 keV was obtained. 相似文献
5.
6.
A. S. Sidorenko L. R. Tagirov A. N. Rossolenko N. S. Sidorov V. I. Zdravkov V. V. Ryazanov M. Klemm S. Horn R. Tidecks 《JETP Letters》2002,76(1):17-20
According to the crystal structure of MgB2 and band structure calculations, quasi-two-dimensional (2D) boron planes are responsible for the superconductivity. We report on critical-field and resistance measurements of 5.6-μm-thick MgB2 films grown on a sapphire single-crystal substrate. Resistivity measurements yield a temperature dependence of the fluctuation conductivity above the critical temperature, which agrees with the Aslamazov-Larkin and Maki-Thompson theory of fluctuations in layered superconductors, indicating a quasi-two-dimensional nucleation of superconductivity in MgB2. 相似文献
7.
A. V. Vodopyanov S. V. Golubev V. G. Zorin S. V. Razin A. V. Sidorov V. A. Skalyga A. G. Shalashov 《Radiophysics and Quantum Electronics》2003,46(8-9):737-743
We demonstrate experimentally the possibility to create and sustain a strongly ionized plasma at low gas pressures by the electromagnetic radiation of the intensity which is below the conventional breakdown level. The conditions of ignition and sustaining the plasma are found, and the plasma parameters are measured. The necessary condition for the discharge formation is strong preliminary ionization of an initial gas. Significant electron heating in the RF field, which ensures the effective gas ionization takes place due to Coulomb collisions with protoplasma ions. Such collisions are much more frequent than the electron-neutral collisions. We propose a qualitative analytical model of the discharge evolution, which describes the effects observed. 相似文献
8.
Demin D. L. Dzhelepov V. P. Filchenkov V. V. Grafov N. N. Grebinnik V. G. Migachev D. V. Konin A. D. Rudenko A. I. Sidorov V. T. Zhestkov Yu. G. Zinov V. G. Davies J. D. Bom V. R. van Eijk C. W. E. 《Hyperfine Interactions》1996,101(1):13-19
The ddµ molecule formation rate is experimentally measured for the two hyperfine states of the dµ-atom in the temperature range of 5–30 K. Results are consistent with a preliminary measurement by the TRIUMF group and contradict theoretical predictions. The work has been performed on the JINR phasotron (Dubna). 相似文献
9.
10.
S. I. Dolinsky V. P. Druzhinin M. S. Dubrovin V. B. Golubev V. N. Ivanchenko A. P. Lysenko A. A. Mikhailichenko E. V. Pakhtusova A. N. Peryshkin S. I. Serednyakov Yu. M. Shatunov V. A. Sidorov 《Zeitschrift fur Physik C Particles and Fields》1989,42(4):511-518
The results of the measurements of radiative decays of ρ and ω mesons with the Neutral Detector at thee + e ? collider VEPP-2M are presented. The branching ratio of the decay ω→π 0γ was measured with higher than in previous experiments accuracy: $${\rm B}(\omega \to \pi ^0 \gamma ) = 0.0888 \pm 0.0062$$ . The ρ0→π 0 γ branching ratio was measured for the first time: $$B(\rho ^0 \to \pi ^0 \gamma ) = (7.9 \pm 2.0) \cdot 10^{ - 4} $$ . The decays ρ, ω→ηγ were studied. Their branching ratios with the assumption of constructive ρ?ω interference are: $$\begin{gathered} B(\omega \to \eta \gamma ) = (7.3 \pm 2.9) \cdot 10^{ - 4} , \hfill \\ B(\rho \to \eta \gamma ) = (4.0 \pm 1.1) \cdot 10^{ - 4} \hfill \\ \end{gathered} $$ . The branching ratios of ρ, ω→ηγ and ω→e + e ? decays were also measured: $$\begin{gathered} B(\omega \to \pi ^ + \pi ^ - \pi ^0 ) = 0.8942 \pm 0.0062, \hfill \\ B(\omega \to e^ + e^ - ) = (7.14 \pm 0.36) \cdot 10^{ - 5} \hfill \\ \end{gathered} $$ . The upper limit for the ω→π 0 π 0 γ branching ratio was placed: B(ω→π 0 π 0 γ)<4·10?4 at 90% confidence level. 相似文献