全文获取类型
收费全文 | 196篇 |
免费 | 0篇 |
专业分类
化学 | 23篇 |
晶体学 | 2篇 |
力学 | 7篇 |
数学 | 14篇 |
物理学 | 150篇 |
出版年
2022年 | 1篇 |
2021年 | 7篇 |
2020年 | 9篇 |
2019年 | 10篇 |
2018年 | 8篇 |
2017年 | 5篇 |
2016年 | 10篇 |
2015年 | 1篇 |
2014年 | 6篇 |
2013年 | 6篇 |
2012年 | 10篇 |
2011年 | 13篇 |
2010年 | 13篇 |
2009年 | 12篇 |
2008年 | 10篇 |
2007年 | 13篇 |
2006年 | 2篇 |
2005年 | 3篇 |
2004年 | 4篇 |
2003年 | 4篇 |
2002年 | 3篇 |
2001年 | 5篇 |
2000年 | 4篇 |
1999年 | 6篇 |
1998年 | 5篇 |
1997年 | 6篇 |
1993年 | 1篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1975年 | 3篇 |
1974年 | 4篇 |
1973年 | 3篇 |
1972年 | 4篇 |
1968年 | 1篇 |
排序方式: 共有196条查询结果,搜索用时 0 毫秒
191.
Yu. N. Morgunov A. A. Golov D. S. Strobykin Kiseon Kim Chansan Kim Shinrae Ro 《Acoustical Physics》2012,58(3):320-325
The paper describes the results of testing experiments for solving problems of thermometry and positioning of an autonomous underwater vehicle (AUV) in the Korean Strait in a shallow sea with less than 10 m of water. The studies were conducted on acoustic tracks up to 615 m long, sensed with complex phase-shift keyed signals with a centeral frequency of 2500 Hz. Under field experiment conditions, it was shown that the resolution of the structure of pulse responses makes it possible to sense temperature changes less than one degree and to secure positioning of the AUV with an accuracy better than 1 m when operating in the near-bottom layer. 相似文献
192.
The effect of temperature conditions of ion implantation on the magnetic properties of Ge0.98Mn0.02 thin films has been studied. It has been shown that a decrease in the implantation temperature significantly increases the temperature of percolation magnetic ordering in the subsystem of dispersed Mn2+ ions. It has been demonstrated that the observed effect can be due to suppression of the thermally activated aggregation of Mn2+ ions into Ge3Mn5 clusters and increase in their concentration in the dispersed state. 相似文献
193.
194.
Dr. Leokadiya V. Zorina Dr. Sergey V. Simonov Dr. Valentina D. Sasnovskaya Dr. Artem D. Talantsev Prof. Dr. Roman B. Morgunov Dr. Vladimir S. Mironov Prof. Dr. Eduard B. Yagubskii 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(64):14583-14597
Reactions of [Mn(H2dapsc)Cl2] ⋅ H2O (dapsc=2,6- diacetylpyridine bis(semicarbazone)) with K3[Fe(CN)6] and (PPh4)3[Fe(CN)6] lead to the formation of the chain polymeric complex {[Mn(H2dapsc)][Fe(CN)6][K(H2O)3.5]}n ⋅ 1.5n H2O ( 1 ) and the discrete pentanuclear complex {[Mn(H2dapsc)]3[Fe(CN)6]2(H2O)2} ⋅ 4 CH3OH ⋅ 3.4 H2O ( 2 ), respectively. In the crystal structure of 1 the high-spin [MnII(H2dapsc)]2+ cations and low-spin hexacyanoferrate(III) anions are assembled into alternating heterometallic cyano-bridged chains. The K+ ions are located between the chains and are coordinated by oxygen atoms of the H2dapsc ligand and water molecules. The magnetic structure of 1 is built from ferrimagnetic chains, which are antiferromagnetically coupled. The complex exhibits metamagnetism and frequency-dependent ac magnetic susceptibility, indicating single-chain magnetic behavior with a Mydosh-parameter φ=0.12 and an effective energy barrier (Ueff/kB) of 36.0 K with τ0=2.34×10−11 s for the spin relaxation. Detailed theoretical analysis showed highly anisotropic intra-chain spin coupling between [FeIII(CN)6]3− and [MnII(H2dapsc)]2+ units resulting from orbital degeneracy and unquenched orbital momentum of [FeIII(CN)6]3− complexes. The origin of the metamagnetic transition is discussed in terms of strong magnetic anisotropy and weak AF interchain spin coupling. 相似文献
195.
L. A. Kushch V. D. Sasnovskaya E. B. Yagubskii A. I. Dmitriev R. B. Morgunov V. A. Emel’yanov T. Woike 《Russian Chemical Bulletin》2011,60(6):1078-1084
Mono- and dianionic oxocarboxylate Ru-Mn12 clusters, [RuNO(en)2Cl]-[Mn12O12(O2CR)16(H2O)4]2 (R = Ph (1)), [RuNO(en)2Cl][Mn12O12(O2CR)16(H2O)4] (R = C6F5 (2), CH2Cl (3), R = CHCl2 (4)), and [RuNO(NH3)4OH][Mn12O12(O2CR)16(H2O)4] (R = CH2Cl (5), CHCl2 (6)) containing photochromic mononitrosyl ruthenium complexes as cations were synthesized. The magnetic properties of the complexes
in static and alternating magnetic fields were studied, and compounds 1–6 were found to be molecular nanomagnets. By IR spectroscopy, they were shown to exhibit also photochromic properties. 相似文献
196.
N. A. Sanina T. N. Rudneva S. M. Aldoshin A. N. Chekhlov R. B. Morgunov E. V. Kurganova N. S. Ovanesyan 《Russian Chemical Bulletin》2007,56(1):28-34
The neutral dinuclear iron nitrosyl complex [Fe2(SC3H5N2)2(NO)4] (1) of the “g = 2.03” family with a ligand analogous to natural mercaptohistidine was synthesized by the metathesis reaction
of the thiosulfate ligands in the [Fe2(S2O3)2(NO)4]2− anion with imidazolidine-2-thiolate ligands. The electrochemical determination of nitrogen oxide in solution showed that
compound 1 has a lower NO-donor ability compared to the iron complexes with 1-methylimidazole-2-thiol and imidazole-2-thiol synthesized
earlier. Study of the magnetic properties of polycrystals of 1 demonstrated that the effective magnetic moment at room temperature is ca. 2.45 μB and corresponds to a molecule containing a pair of the noninteracting spins S = 1/2. This is evidence that each iron coordination
unit in complex 1 contains one unpaired electron, and the iron atom is in the low-spin state.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 28–34, January, 2007. 相似文献