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21.
A. V. Gonchar S. N. Kondrat'ev Yu. N. Lobach S. V. Nevskii V. D. Sklyarenko V. V. Tokarevskii 《Atomic Energy》1993,75(3):719-724
Institute of Nuclear Research, Academy of Sciences of Ukraine. Translated from Atomnaya Énergiya, Vol. 75, No. 3, pp. 213-219, September, 1993. 相似文献
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D. V. Pavlenko S. V. Loskutov V. K. Yatsenko N. V. Gonchar 《Technical Physics Letters》2003,29(4):345-346
Experimental data showing variation of the mechanical properties of the surface layer of a nickel-based EK79-ID alloy depending
on the degree of surface straining are presented. The elastic modulus and the proof stress of the surface layer exhibit nonmonotonic
variation with the degree of straining. The possible mechanisms determining changes in the elastic modulus in the course of
the surface structure variation caused by the strain hardening are considered. 相似文献
28.
The changes in AA incorporation and release as well as prostanoid synthesis upon differentiation of human premonocytic cell line, U937, induced by three functionally diverse agents--phorbol ester (TPA), dimethyl sulfoxide (DMSO), and retinoic acid (RA) have been investigated. The rate of AA incorporation into the cells remained unchanged whereas a 3- to 6-fold increase in AA release upon stimulation with Ca(2+)-ionophore A23187 as compared to undifferentiated cells was observed. While undifferentiated cells were incapable to metabolise AA via the cyclooxygenase pathway all three types of differentiated U937 cells produced TxB2 and PGE2. Only TPA-differentiated cells responded with a 6-fold increase of prostanoid synthesis after A23187 stimulation, whereas in DMSO-differentiated cells prostanoid synthesis was slightly stimulated by A23187 and in RA-differentiated cells it was not stimulated at all. Thus, agonist-induced prostanoid synthesis in differentiated cells is dependent on the nature of differentiating agent and does not correlate with AA liberation. 相似文献
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Liubov A Osminkina Kirill A Gonchar Vladimir S Marshov Konstantin V Bunkov Dmitry V Petrov Leonid A Golovan Florian Talkenberg Vladimir A Sivakov Victor Yu Timoshenko 《Nanoscale research letters》2012,7(1):524
We study the structure and optical properties of arrays of silicon nanowires (SiNWs) with a mean diameter of approximately 100 nm and length of about 1–25 μm formed on crystalline silicon (c-Si) substrates by using metal-assisted chemical etching in hydrofluoric acid solutions. In the middle infrared spectral region, the reflectance and transmittance of the formed SiNW arrays can be described in the framework of an effective medium with the effective refractive index of about 1.3 (porosity, approximately 75%), while a strong light scattering for wavelength of 0.3 ÷ 1 μm results in a decrease of the total reflectance of 1%-5%, which cannot be described in the effective medium approximation. The Raman scattering intensity under excitation at approximately 1 μm increases strongly in the sample with SiNWs in comparison with that in c-Si substrate. This effect is related to an increase of the light-matter interaction time due to the strong scattering of the excitation light in SiNW array. The prepared SiNWs are discussed as a kind of ‘black silicon’, which can be formed in a large scale and can be used for photonic applications as well as in molecular sensing. 相似文献
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Strength of Materials - The paper presents the results of studying the contact endurance and wear resistance of boride coatings, which were deposited on the 40Kh and ShKh15 steels by chemical heat... 相似文献