全文获取类型
收费全文 | 117篇 |
免费 | 0篇 |
国内免费 | 1篇 |
专业分类
化学 | 61篇 |
力学 | 1篇 |
数学 | 18篇 |
物理学 | 38篇 |
出版年
2021年 | 3篇 |
2020年 | 1篇 |
2019年 | 2篇 |
2018年 | 3篇 |
2017年 | 1篇 |
2016年 | 2篇 |
2014年 | 1篇 |
2013年 | 2篇 |
2012年 | 6篇 |
2011年 | 3篇 |
2010年 | 8篇 |
2009年 | 2篇 |
2008年 | 8篇 |
2007年 | 4篇 |
2006年 | 7篇 |
2005年 | 3篇 |
2004年 | 4篇 |
2003年 | 3篇 |
2002年 | 4篇 |
2001年 | 5篇 |
2000年 | 6篇 |
1999年 | 2篇 |
1998年 | 2篇 |
1997年 | 3篇 |
1996年 | 2篇 |
1993年 | 2篇 |
1991年 | 3篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1984年 | 2篇 |
1983年 | 4篇 |
1982年 | 1篇 |
1980年 | 3篇 |
1979年 | 1篇 |
1978年 | 2篇 |
1977年 | 4篇 |
1976年 | 3篇 |
1975年 | 1篇 |
1972年 | 1篇 |
排序方式: 共有118条查询结果,搜索用时 5 毫秒
61.
V. V. Paramonov L. V. Kravchuk V. A. Moiseev A. N. Naboka A. K. Skasyrskaya 《Physics of Particles and Nuclei Letters》2008,5(7):593-596
The critical part of the normal conducting (NC) positron preaccelerator (PPA) at the ILC positron source (PS) are capture
sections that should operate with an accelerating gradient of up to 15 MV/m in combination with long RF pulse (∼1 ms). Developed
at the Institute of Nuclear Research (INR) and now being constructed at DESY, the CDS booster cavity for the Photo Injector
Test facility, DESY, Zeuthen, will operate under the same conditions and is a full-scale, high-RF-power prototype of the PS
capture cavities. Cavity construction status and results of cavity tuning at a low RF level are presented. Other features
of the standing wave cavities for the PPA, such as RF pulsed heating, advanced cooling, and beam loading, are discussed.
The text was submitted by the authors in English. 相似文献
62.
63.
A. B. Smolentsev V. V. Korolev E. M. Glebov V. P. Grivin V. F. Plyusnin A. I. Kruppa A. V. Chebun’kova S. V. Paramonov O. A. Fedorova V. Lokshin A. Samat 《Kinetics and Catalysis》2012,53(1):54-64
The photochemistry and complexation with alkaline-earth metal cations of two crown-containing naphthopyrans and their crownless analogues are reported. Two types of photoreactions occur in the system, namely, the reversible formation of the open form, which is responsible for the photochromism of these compounds, and the geometric isomerization of the closed form. The photochromic properties (UV spectrum and lifetime) of the naphthopyrans do not change upon complexation with metal cations. This is explained by the specific features of the structure of the open form and by the kinetic parameters of the processes. 相似文献
64.
S. M. Aldoshin N. A. Sanina R. B. Morgunov O. A. Fedorova S. V. Paramonov V. B. Lokshin F. B. Mushenok G. V. Shilov K. V. Bozhenko D. V. Korchagin 《Russian Chemical Bulletin》2010,59(3):497-509
Single crystals of the new cationic chromene, 7-methyl-3,3-diphenyl-3H-pyrano[3,2-f-quinolinium iodide (C25H20NO)I (1), were synthesized. The crystal structure of the new compound was studied, and quantum chemical calculation for the
open and closed forms were carried out. The bifunctional compounds containing mono- and bimetallic 3d metal (tris)oxalates
with the chromenium cation, (C25H20NO)3[Cr(C2O4)3] · 4H2O (2) and (C25H20NO)[CrMn(C2O4)3] · H2O (3), were prepared. Compound 1 is paramagnetic due to low-lying thermally excited states of the chromene molecules. At low
temperatures (∼2 K), the paramagnetic states are frozen, and the compound becomes diamagnetic. Compound 2 is paramagnetic
and its magnetic properties are determined mainly by the Cr3+ ions and the thermally induced paramagnetic states of the chromene molecules. At high temperatures, the magnetic moment of
compound 3 consists of the contributions of the paramagnetic Cr3+ and Mn2+ ions and the thermally induced paramagnetic states of chromenes. At low temperatures (2–3 K), the thermally induced magnetism
of organic molecules is frozen, and the magnetically ordered (and, probably, spin-glass) state is observed in the two-dimensional
network of metal oxalates (T
c = 3 K in the zero magnetic field). The UV irradiation leads to an increase in the magnetic moment of the compound in the
paramagnetic region due to the generation of radiation defects. 相似文献
65.
A. S. Yusupov S. E. Goncharov I. D. Zalevskii V. M. Paramonov A. S. Kurkov 《Laser Physics》2010,20(2):357-359
An SRS laser with a radiation wavelength of 1.262 μm and a maximum power of 5.5 W is presented. The laser wavelength corresponds
to the excitation band of singlet oxygen and can be used for the treatment of oncological diseases. The laser source is employed
for the treatment of basalioma. 相似文献
66.
<正>The square soft-edge diaphragm with round angle is designed by Matlab,and is sent to a liquid crystal spatial light modulator by the computer.In order to obtain precompensation for the following laser system, local diaphragm transmission can be adjusted by feedback signals of surface-channel charge-coupled device (SCCD).This method can reduce the diffraction effect and realize no modulation,high stability,high homogeneity,and large scale laser beam.Several parameters of soft-edge diaphragms which affect the laser beam quality are studied systematically,and the optimized values are obtained.The method can avoid the serious modulation of hard edges and provide soft-edge diaphragms of different shapes in a fast and convenient way for the large scale laser beam system. 相似文献
67.
Shaibakova M. G. Makhmudiyarov G. A. Khalilov L. M. Paramonov E. A. Ibragimov A. G. Dzhemilev U. M. 《Russian Journal of Organic Chemistry》2010,46(3):422-426
An effective one-step procedure has been developed for the synthesis of 4- and 2,3,4-substituted quinolines via reaction of
o-iodoaniline with alk-2-yn-1-amines in the presence of Pd(OAc)2 as catalyst. 相似文献
68.
Yugai G. A. Mostoslavskii M. A. Paramonov V. D. 《Theoretical and Experimental Chemistry》1977,12(5):549-551
Theoretical and Experimental Chemistry - 相似文献
69.
Paramonov Yu. M. Kleinhof M. A. Paramonova A. Yu. 《Mechanics of Composite Materials》2002,38(6):485-492
A simple mathematical model for the fatigue life of composite materials in which the basic load is taken up by parallel rigid components (fiber strands) is offered. Based on the Markov chain theory, the model allows us to obtain an S-type curve for the growth of internal stresses and to calculate the relationship between the parameters of static strength distribution and the S-N fatigue curve (Wholer curve). The model is too simple and does not provide a numerical coincidence with experimental fatigue-test data, but, when used with additional parameters, it agrees with experiments and can be applied to the model of nonlinear regression in describing the fatigue curve and its variation as the parameters of static strength change. 相似文献
70.
Sergey V. Paramonov Vladimir Lokshin Artem B. Smolentsev Evgeni M. Glebov Valeri V. Korolev Stepan S. Basok Konstantin A. Lysenko Stéphanie Delbaere Olga A. Fedorova 《Tetrahedron》2012,68(38):7873-7883
Combining a photochromic chromene with a crown ether moiety results in systems in which photochromism and ionophoric properties could significantly influence each other. In this paper, we report the synthesis of several chromenes annelated by 15(18)-crown-5(6) ethers. The approach involves the building of the photochromic fragment upon the initial crown ether via phenols. The two main routes for chromene preparation are discussed. The complex formation of the synthesized photochromic crown-containing naphthopyran with magnesium(II) and barium(II) cations was studied. The kinetic behavior of the colored form of the compound is affected by complex formation. 相似文献