全文获取类型
收费全文 | 118篇 |
免费 | 2篇 |
国内免费 | 3篇 |
专业分类
化学 | 55篇 |
力学 | 4篇 |
数学 | 40篇 |
物理学 | 24篇 |
出版年
2022年 | 4篇 |
2020年 | 4篇 |
2018年 | 7篇 |
2017年 | 5篇 |
2016年 | 7篇 |
2015年 | 6篇 |
2014年 | 3篇 |
2013年 | 9篇 |
2012年 | 4篇 |
2011年 | 12篇 |
2010年 | 10篇 |
2009年 | 3篇 |
2008年 | 7篇 |
2007年 | 8篇 |
2006年 | 9篇 |
2005年 | 3篇 |
2003年 | 4篇 |
2002年 | 1篇 |
2001年 | 2篇 |
2000年 | 1篇 |
1999年 | 3篇 |
1996年 | 2篇 |
1995年 | 1篇 |
1992年 | 2篇 |
1991年 | 1篇 |
1981年 | 1篇 |
1978年 | 1篇 |
1974年 | 1篇 |
1971年 | 1篇 |
1967年 | 1篇 |
排序方式: 共有123条查询结果,搜索用时 109 毫秒
1.
JETP Letters - A quasi-two-dimensional plasma crystal in (3 + 1) dimensions has been experimentally observed for the first time; i.e., three spatial coordinates of each microparticles of the... 相似文献
2.
E. I. Kaikina P. I. Naumkin I. A. Shishmarev 《Journal of Mathematical Sciences》2007,142(3):2113-2121
The large-time asymptotic behavior of solutions of the Cauchy problem for a system of nonlinear evolutionary equations with
dissipation is studied. The approach used in the case of small initial data is based on the construction of solutions by the
method of contracting mappings. In the case of large initial data, we will obtain the large-time asymptotics of solutions
with a certain symmmetry of a nonlinear term taken into account. In the critical case, it is proved that if the initial data
has a nonzero total mass, then the principal term of the large-time asymptotics of a solution is given by the self-similar
solution uniquely determined by the total mass of the initial data.
__________
Translated from Sovremennaya Matematika i Ee Prilozheniya (Contemporary Mathematics and Its Applications), Vol. 29, Voronezh
Conference-1, 2005. 相似文献
3.
We report extensive computational studies of some novel intermolecular systems and their properties. Recombination of alkali-halide counterions separated by a noncovalently trapped hydrocarbon molecule is prevented by significant potential energy barriers, resulting in unusual metastable insertion complexes. These systems are extremely polar, while the inserted molecule is strongly counter-polarized, leading to significant cooperative nonadditivity effects. The compression and electric field produced by the counterions favours isomerization of the trapped molecule via a significant reduction of the barriers to bond rearrangement, in a field-induced mechanochemical process. The predicted IR intensity spectra clearly reflect (1) formation of the insertion complex, rather than simple attachment of alkali halide, and (2) isomerization of the trapped molecule, thus allowing experimental access to these events. 相似文献
4.
E. Yu. Liberman A. V. Naumkin A. A. Revina A. I. Mikhailichenko M. V. Tsodikov S. A. Medvedeva T. V. Kon’kova 《High Energy Chemistry》2018,52(4):307-311
The effect of electron-beam irradiation on the catalytic properties of PdO/CeO2 has been examined. It has been found that irradiation in the range of 15–30 kGy results in an increase in the concentration of the radical anion [O?], thereby enhancing the catalytic activity of PdO/CeO2. 相似文献
5.
6.
K. A. Arushanov I. A. Zeltser S. M. Karabanov R. M. Maizels K. I. Maslakov E. N. Moos A. V. Naumkin 《Bulletin of the Russian Academy of Sciences: Physics》2012,76(6):669-673
Iron-nickel contact surfaces subjected to ion-induced modification are studied by AES, XPS and AFM. The corrosion and erosion resistance of the modified contacts is associated with features of the surface topography, and with the formation of iron and nickel nitride layers. The fine energy structure of the atomic state is revealed. Ion irradiation of the contact surfaces yields the formation of pores and cones. 相似文献
7.
A. Yu. Vasil’kov I. P. Suzdalev Yu. V. Maksimov L. N. Nikitin A. V. Naumkin S. S. Abramchuk E. M. Tolstopyatov P. N. Grakovich 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2013,87(6):985-991
A method for synthesizing iron-containing nanocomposite based on fibroporous polytetrafluoroethylene (PTFE) is described. Fibroporous PTFE obtained under the radiation of a CO2 laser on block PTFE is modified in supercritical carbon dioxide (sc CO2) to form micro- and nanoporous structures. Porous fluoropolymer is treated with a solution of bis(toluene)iron(0) obtained by metal-vapor synthesis (MVS). The composition and structure of iron-containing fluoropolymer is studied by transmission electron microscopy and X-ray photoelectron and Mössbauer spectroscopy. Fe nanoparticles with an average size of 9 nm, consisting of ~30% FeO and ~70% Fe3+, are registered in the sample. Fe0 nanoparticles are stabilized in fluoropolymer pores and are coated with nanoparticles of nonstoichiometric iron oxides that have superparamagnetic properties. 相似文献
8.
Nakao Hayashi Pavel I. Naumkin Yasuko Yamazaki 《Proceedings of the American Mathematical Society》2002,130(3):779-789
We consider the derivative nonlinear Schrödinger equations
where the coefficient satisfies the time growth condition
is a sufficiently small constant and the nonlinear interaction term consists of cubic nonlinearities of derivative type
where and . We suppose that the initial data satifsfy the exponential decay conditions. Then we prove the sharp decay estimate , for all , where . Furthermore we show that for there exist the usual scattering states, when and the modified scattering states, when
where the coefficient satisfies the time growth condition
is a sufficiently small constant and the nonlinear interaction term consists of cubic nonlinearities of derivative type
where and . We suppose that the initial data satifsfy the exponential decay conditions. Then we prove the sharp decay estimate , for all , where . Furthermore we show that for there exist the usual scattering states, when and the modified scattering states, when
9.
A. Yu. Vasil’kov D. A. Migulin A. V. Naumkin Ya. V. Zubavichus A. V. Budnikov O. G. Ellert Yu. V. Maksimov A. M. Muzafarov 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2017,91(11):2188-2194
New hybrid materials based on Pt, Fe, and Pt–Fe nanoparticles stabilized in a matrix of polymethylsilsesquioxane nanogel and ultrahigh molecular weight polyethylene (UHMWPE) were prepared. Metal vapor synthesis was used to produce mono- and bimetallic nanoparticles. It was shown that organosilicon nanogel effectively stabilizes Pt nanoparticles with an average size of 0.9 nm. Using the nanogel results in the formation of superparamagnetic Fe particles 3–5 nm in size that consist of ferromagnetic Fe0 core and antiferromagnetic shells of Fe oxides. It is established that using an organosilicon matrix in the formation of Pt-Fe/UHMWPE systems helps reduce the average particle size of Fe in the material from 6.5 to 4.5 nm and narrow their particle size distribution. The composition, magnetic and electronic characteristics of the nanocomposites are studied via transmission electron microscopy, X-ray photoelectron spectroscopy, Mössbauer spectroscopy, XANES, and EXAFS. 相似文献
10.
D. A. Rud’ L. Zh. Nikoshvili T. P. Loginova A. V. Naumkin Yu. L. Slovokhotov V. G. Matveeva M. G. Sul’man I. A. Khotina 《Polymer Science Series B》2010,52(1-2):49-56
Structured polyphenylenes that are used as matrices for immobilization of palladium nanoparticles are synthesized through the cyclocondensation of acetylaromatic compounds followed by structuring at different temperatures and, as a result, different crosslink densities. The relationship between the structure and structuring temperature of the polymers is investigated. It is shown that the sizes of palladium nanoparticles immobilized in polyphenylene matrices depend on the conditions of polymer structuring. The resulting catalytic systems are examined for the selective hydrogenation of triple bonds in acetylene alcohols. 相似文献