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51.
52.
Kravets VG Zoriniants G Burrows CP Schedin F Casiraghi C Klar P Geim AK Barnes WL Grigorenko AN 《Physical review letters》2010,105(24):246806
We present composite plasmonic nanostructures designed to achieve cascaded enhancement of electromagnetic fields at optical frequencies. Our structures were made with the help of electron-beam lithography and comprise a set of metallic nanodisks placed one above another. The optical properties of reproducible arrays of these structures were studied by using scanning confocal Raman spectroscopy. We show that our composite nanostructures robustly demonstrate dramatic enhancement of the Raman signals when compared to those measured from constituent elements. 相似文献
53.
The similarity transform and the properties of quaternion matrices are used to derive invariant expressions for the inertia
matrix and kinetic energy of an asymmetric rigid body undergoing spatial motion around a fixed point in body-fixed and inertial
frames of reference. The elements of the quaternion matrixes are Rodrigues–Hamilton parameters and quasi-velocities 相似文献
54.
P. Yu. Apel A. Yu. Didyk B. I. Fursov L. I. Kravets V. G. Nesterov L. I. Samoilova G. S. Zhdanov 《Radiation measurements》1997,28(1-6):19-24
Registration temperature effect in two different polymers - poly(ethylene terephthalate) (PET) and polypropylene (PP) films - is investigated. Temperature effects on track formation are considered in terms of molecular mobility and relaxation transitions. The track eth rate is measured as a function of irradiation temperature in the range of 77 to 373 K. The obtained results are compared with the radical yields, radiothermoluminescence curves and thermally stimulated currents measured with the aim of detecting changes in the mobility of macromolecules and radiolysis intermediates. It is found that the change of the track etch rate with changing registration temperature correlates with γ- and glass transitions in PP and with β-and glass transitions in PET. 相似文献
55.
T. N. Kravets 《Journal of Mathematical Sciences》1991,53(1):44-48
A sequence of approximating equations is constructed for stochastic differential inclusions, and the properties of the measures corresponding to solutions of the approximating equations are studied for the class of stochastic differential inclusions.Translated fromTeoriya Sluchaínykh Protsessov, Vol. 14, pp. 43–48, 1986. 相似文献
56.
N. M. Mirsalikhova S. S. Kravets S. F. Sokolova N. K. Abubakirov 《Chemistry of Natural Compounds》1993,29(4):490-497
A comparative investigation has been made of the action of 14 steroid glycosides of the spirostan and furostan series on highly
purified Na,K-ATPase from the medullary layer of porcine kidneys (∼90% purity in terms of protein). It has been shown that
alliospirosides A, B, and D, isolated from the collective fruit ofAllium sepa L., are capable of inhibiting the activity of the Na,K-ATPase The inhibition of the activity of the transport enzyme by alliospirosides
A and B is of the uncompetitive type and by alliospiroside D of the competitive type. It is desirable to test alliospirosides
on the intact organism.
Institute of Physiology, Academy of Sciences of the Republic of Uzbekistan. Institute of the Chemistry of Plant Substances,
Academy of Sciences of the Republic of Uzbekistan. Translated from Khimiya Prirodnykh Soedinenii, No. 4, pp. 558–566, July–August,
1993. 相似文献
57.
L. I. Kravets A. B. Gil’man M. Yu. Yablokov V. A. Altynov O. L. Orelovitch 《High Energy Chemistry》2016,50(6):460-465
The chemical structure and the contact and morphological properties of composite membranes prepared by electron-beam sputter deposition of a polytetrafluoroethylene layer on the surface of track-etched polypropylene membrane have been studied. It has been found that the application of such layers results in bilayer composite membranes with both the layers having hydrophobic properties. It has been shown that an increase in the thickness of the deposited polytetrafluoroethylene layer leads to development of its roughness, resulting in the formation of a polymer with superhydrophobic properties on the surface of the initial membrane. 相似文献
58.
Polypropylene track membranes made by irradiation of polypropylene films with a beam of high-energy heavy ions followed by chemical etching of latent ion tracks are proposed for being used as a polarized target material. To give membranes paramagnetic properties needed for allowing dynamic polarization of nuclei, the nitroxyl radical 2,2,6,6-tetramethylpiperidine-1-oxyl was introduced in the samples by the thermal diffusion technique. Using the electron paramagnetic resonance method, we obtained information on paramagnetic centers in the polymer matrix of the membranes and determined the nitroxyl radical concentration and rotational mobility of the spin probe in them. 相似文献
59.
A.F. Kravets A.N. Timoshevskii B.Z. Yanchitsky O.Yu. Salyuk S.O. Yablonovskii S. Andersson V. Korenivski 《Journal of magnetism and magnetic materials》2012
Magneto-structural properties of films of diluted ferromagnetic alloys NixCu1−x in the concentration range 0.7<x<1.0 are studied experimentally. Films deposited by magnetron sputtering show partial phase separation, as evidenced by structural analysis and ferromagnetic resonance measurements. The phase diagram of the NixCu1−x bulk system is obtained using numerical theoretical analysis of the electronic structure, taking into account the interatomic exchange interactions. The results confirm the experimentally found partial phase separation, explain it as magnetic in origin, and indicate an additional metastable region connected with the ferromagnetic transition in the system. 相似文献
60.
L. A. Pesin S. S. Chebotaryov A. M. Kuvshinov I. I. Bespal’ I. V. Gribov N. A. Moskvina V. L. Kuznetsov S. E. Evsyukov A. V. Vyazovtsev N. S. Kravets 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2010,4(2):214-220
It has been studied how photoelectron and CKVV spectra of partially crystalline poly(vinylidene fluoride) (PVDF) are modified during a long-term degradation of its surface
under soft X-rays (AlK
α), which is accompanied by a flow of secondary electrons having different energies, and upon exposure to a unfocused beam
of 600 eV Ar+ ions. In both cases, the surface layer of the sample is enriched with carbon owing to defluorination. The shape of the electron
emission spectra of the carbonized layer depends on an external effect; that is, whether soft X-ray photons or ions are used
for defluorination. In the case of bombardment with Ar+, there is clear evidence for the dominance of the sp2 bonds between carbon atoms, as can be seen from the specific shape of the C KVV band and the C1s spectrum. The most surprising result of this study is that both photons and ions produce the same depth gradient of residual
fluorine at an equal fluorine concentration in the carbonized surface layer. The reason for this is not clear and needs further
investigation. 相似文献