全文获取类型
收费全文 | 1156篇 |
免费 | 5篇 |
国内免费 | 2篇 |
专业分类
化学 | 407篇 |
晶体学 | 17篇 |
力学 | 15篇 |
数学 | 178篇 |
物理学 | 546篇 |
出版年
2022年 | 11篇 |
2021年 | 28篇 |
2020年 | 25篇 |
2019年 | 30篇 |
2018年 | 24篇 |
2017年 | 30篇 |
2016年 | 48篇 |
2015年 | 12篇 |
2014年 | 40篇 |
2013年 | 53篇 |
2012年 | 23篇 |
2011年 | 38篇 |
2010年 | 37篇 |
2009年 | 26篇 |
2008年 | 40篇 |
2007年 | 30篇 |
2006年 | 45篇 |
2005年 | 39篇 |
2004年 | 35篇 |
2003年 | 27篇 |
2002年 | 39篇 |
2001年 | 35篇 |
2000年 | 18篇 |
1999年 | 11篇 |
1998年 | 13篇 |
1997年 | 18篇 |
1996年 | 14篇 |
1995年 | 15篇 |
1994年 | 10篇 |
1992年 | 13篇 |
1990年 | 29篇 |
1989年 | 16篇 |
1988年 | 16篇 |
1987年 | 12篇 |
1986年 | 11篇 |
1985年 | 16篇 |
1984年 | 18篇 |
1983年 | 11篇 |
1982年 | 10篇 |
1981年 | 13篇 |
1980年 | 14篇 |
1979年 | 10篇 |
1978年 | 16篇 |
1977年 | 12篇 |
1975年 | 14篇 |
1973年 | 10篇 |
1972年 | 11篇 |
1971年 | 12篇 |
1969年 | 8篇 |
1966年 | 11篇 |
排序方式: 共有1163条查询结果,搜索用时 62 毫秒
1.
Doklady Mathematics - New properties of convex infinitely differentiable functions related to extremal problems are established. It is shown that, in a neighborhood of the solution, even if the... 相似文献
2.
Bryzgunov M. I. Denisov A. P. Panasyuk V. M. Parkhomchuk V. V. Reva V. B. Chekavinskii V. A. 《Technical Physics》2021,66(5):716-723
Technical Physics - A high-voltage system for electron cooling of the COSY (Germany) synchrotron is featured by the presence of a profile monitor that is used for measurement of current density... 相似文献
3.
Differential Equations - We consider an initial–boundary value problem for the heat equation in which the heat conduction coefficient and one of the functions occurring in the source depend... 相似文献
4.
M. S. Denisov A. D. Antuf’eva A. A. Gorbunov K. O. Manylova V. A. Glushkov 《Russian Journal of General Chemistry》2015,85(12):2765-2770
Ferrocenol esters were prepared by the reaction of ferrocenylboric acid with aldehydes and air oxygen catalyzed by N-heterocyclic carbene. Optical properties (electron absorption and fluorescence spectra) and electrochemical behavior of the obtained compounds were studied (oxidation and reduction during the process of cyclic voltammetry). 相似文献
5.
Dr. Renata Kaczmarek Samuel Ward Dipra Debnath Taisiya Jacobs Alexander D. Stark Dariusz Korczyński Prof. Dr. Anil Kumar Prof. Dr. Michael D. Sevilla Dr. Sergey A. Denisov Dr. Viacheslav Shcherbakov Dr. Pascal Pernot Prof. Dr. Mehran Mostafavi Prof. Dr. Roman Dembinski Prof. Dr. Amitava Adhikary 《Chemistry (Weinheim an der Bergstrasse, Germany)》2020,26(43):9495-9505
The directionality of the hole-transfer processes between DNA backbone and base was investigated by using phosphorodithioate [P(S−)=S] components. ESR spectroscopy in homogeneous frozen aqueous solutions and pulse radiolysis in aqueous solution at ambient temperature confirmed initial formation of G.+-P(S−)=S. The ionization potential of G-P(S−)=S was calculated to be slightly lower than that of guanine in 5′-dGMP. Subsequent thermally activated hole transfer from G.+ to P(S−)=S led to dithiyl radical (P-2S.) formation on the μs timescale. In parallel, ESR spectroscopy, pulse radiolysis, and density functional theory (DFT) calculations confirmed P-2S. formation in an abasic phosphorodithioate model compound. ESR investigations at low temperatures and higher G-P(S−)=S concentrations showed a bimolecular conversion of P-2S. to the σ2-σ*1-bonded dimer anion radical [-P-2S 2S-P-]− [ΔG (150 K, DFT)=−7.2 kcal mol−1]. However, [-P-2S 2S-P-]− formation was not observed by pulse radiolysis [ΔG° (298 K, DFT)=−1.4 kcal mol−1]. Neither P-2S. nor [-P-2S 2S-P-]− oxidized guanine base; only base-to-backbone hole transfer occurs in phosphorodithioate. 相似文献
6.
Denisov G. L. Primakov P. V. Korlyukov A. A. Novikov V. V. Nelyubina Yu. V. 《Russian Journal of Coordination Chemistry》2019,45(12):836-842
Russian Journal of Coordination Chemistry - The known metal-organic framework {Zn4O(BDC)3} (MOF-5 (I), where BDC is terephthalate anion) is synthesized by the solvothermal method in autoclaves... 相似文献
7.
Kinetics and Catalysis - Experimental data on the reaction of hydrogen atom abstraction from hydrocarbons, halogenated alkanes, and oxygen-containing compounds by oxygen atoms (50 reactions) are... 相似文献
8.
Bryzgunov M. I. Bubley A. V. Denisov A. P. Goncharov A. D. Parkhomchuk V. V. Panasyuk V. M. Reva V. B. Kremnev N. S. Putmakov A. A. Belikov O. V. Gorchakov K. M. Skorobogatov D. N. Chekavinskiy V. A. Bekhtenev E. A. Zharikov A. A. Karpov G. V. Kondaurov M. N. Gusev I. A. Senkov D. V. 《Physics of Particles and Nuclei Letters》2020,17(4):425-428
Physics of Particles and Nuclei Letters - In order to achieve the design luminosity in the NICA collider, it is planned to equip it with both stochastic and electron cooling. The electron-cooling... 相似文献
9.
A. M. Denisov 《Differential Equations》2017,53(9):1114-1120
We consider the inverse problem for a functional-differential equation in which the delay function and a function occurring in the source are unknown. The values of the solution and its derivative at x = 0 are given as additional information. We derive a system of nonlinear integral equations for the unknown functions. This system is used to prove a uniqueness theorem for the inverse problem. 相似文献
10.
Denisov G. L. Primakov P. V. Nelyubina Yu. V. 《Russian Journal of Coordination Chemistry》2021,47(4):253-260
Russian Journal of Coordination Chemistry - A new metal-organic framework {Zn4(BDC)3(OAc)2(DMF)4} (BDC = terephthalate anion) was synthesized under solvothermal conditions in a 3D-printed... 相似文献