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排序方式: 共有84条查询结果,搜索用时 15 毫秒
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N. P. Klochko G. S. Khrypunov N. D. Volkova V. R. Kopach A. V. Momotenko V. N. Lyubov 《Semiconductors》2014,48(4):521-530
A comparative analysis of the structure and surface morphology of copper, indium, tin, and zinc films and their layered compositions fabricated by electrochemical deposition in the galvanostatic steady-state mode, galvanostatic mode with the ultrasonic agitation of electrolytes, and forward and reverse pulsed modes with rectangular potential pulses is made. The effect of the electrodeposition modes on the structure, optical properties, and surface morphology of amorphous and crystalline selenium films is studied. Cu/In/Se and Cu/Sn/Zn/Se film compositions, which are model precursors of, respectively, chalcopyrite CuInSe2 and kesterite, are fabricated by successive electrochemical deposition. Upon being converted by subsequent annealings to CuInSe2 and Cu2ZnSnSe4 semiconductor materials, these precursors will be used as the base layers for a new generation of inexpensive high-efficiency thin-film solar cells. 相似文献
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Monica R. Shah Stephen Wedgwood Lyubov Czech Gina A. Kim Satyan Lakshminrusimha Paul T. Schumacker Robin H. Steinhorn Kathryn N. Farrow 《International journal of molecular sciences》2013,14(2):4334-4348
In the pulmonary vasculature, mechanical forces such as cyclic stretch induce changes in vascular signaling, tone and remodeling. Nitric oxide is a potent regulator of soluble guanylate cyclase (sGC), which drives cGMP production, causing vasorelaxation. Pulmonary artery smooth muscle cells (PASMCs) express inducible nitric oxide synthase (iNOS), and while iNOS expression increases during late gestation, little is known about how cyclic stretch impacts this pathway. In this study, PASMC were subjected to cyclic stretch of 20% amplitude and frequency of 1 Hz for 24 h and compared to control cells maintained under static conditions. Cyclic stretch significantly increased cytosolic oxidative stress as compared to static cells (62.9 ± 5.9% vs. 33.3 ± 5.7% maximal oxidation), as measured by the intracellular redox sensor roGFP. Cyclic stretch also increased sGCβ protein expression (2.5 ± 0.9-fold), sGC activity (1.5 ± 0.2-fold) and cGMP levels (1.8 ± 0.2-fold), as well as iNOS mRNA and protein expression (3.0 ± 0.9 and 2.6 ± 0.7-fold, respectively) relative to control cells. An antioxidant, recombinant human superoxide dismutase (rhSOD), significantly decreased stretch-induced cytosolic oxidative stress, but did not block stretch-induced sGC activity. Inhibition of iNOS with 1400 W or an iNOS-specific siRNA inhibited stretch-induced sGC activity by 30% and 68% respectively vs. static controls. In conclusion, cyclic stretch increases sGC expression and activity in an iNOS-dependent manner in PASMC from fetal lambs. The mechanism that produces iNOS and sGC upregulation is not yet known, but we speculate these effects represent an early compensatory mechanism to counteract the effects of stretch-induced oxidative stress. A better understanding of the interplay between these two distinct pathways could provide key insights into future avenues to treat infants with pulmonary hypertension. 相似文献
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heodctionThe trend of imPrved gas ndine engine designwith higher Hntalc blade loadin and sInallerPhysical size attraCtS much Mon to the aeroelasticbehayour of blades not Ouly in comPI'essors, bu also intuIbines. Flow-induced triine and comPressor bladesoscillations can lead to fatigUe failures of a constrUctionand so rePrsent imPorIant Problems of reliability, safety,and operatin cost.The hahonal aPProach in flutter calculations ofblW disks is based on twency doInain analysis"ro,in whi… 相似文献
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Yuri S. Lipatov Tatiana T. Alekseeva Lyubov A. Sorochinskaya Galina V. Dudarenko 《Polymer Bulletin》2008,59(6):739-747
Summary Peculiarities of formation kinetics of sequential semi-interpenetrating polymer networks based on crosslinked polyurethane
with different cross-linking density and linear polystyrene and polybutylmethacrylate have been studied. Polyurethane networks
were synthesized differing in molecular mass Mc of the chains between cross-links. Monomeric styrene and butyl methacrylate were introduced into these networks by swelling
them in monomers up to equilibrium. The kinetics of polymerization of monomers in swollen networks was investigated. The experimental
data show the dependence of the kinetic parameters of polymerization on Mc, this dependence being different for various monomers. Sharp discrepancy in molecular mass distribution of polymers formed
in various matrices has been observed. The differences in dependencies of reaction kinetics and molecular mass distribution
are supposed to be connected to various dependence of the chain growth and termination of various monomers on the density
of network, i.e. on the confinements imposed by the intranetwork space. 相似文献
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The article deals with the effect of the time-dependent form and heating by preceding pulses on the resulting temperature field in metal subjected to periodic pulsed heat treatment.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 53, No. 4, pp. 642–648, October, 1987. 相似文献
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Jean‐Marie Ringeard Pascal Griesmar Emmanuel Caplain Magalie Michiel Stéphane Serfaty Jean‐Yves Le Huerou Desislava Marinkova Lyubov Yotova 《应用聚合物科学杂志》2013,130(2):835-841
To incorporate microorganisms and to preserve their integrity, new matrices of poly(N‐acryloylglycine) have been designed under appropriate conditions. To understand the interactions between the microorganisms and the organic part of the matrices, different conetworks of poly(N‐acryloylglycine) have been synthesized and characterized. Copolymerization with two crosslinkers was performed with different compositions. The thermal and swelling properties of conetworks are specifically controlled and compared. These investigations show that the swelling ratio of these materials is compatible with the incorporation of biomolecules in these matrices. They successfully permit Pseudomonasspecies 1625 bacteria incorporation. The biological activity of bacteria is also preserved, allowing the use of these materials for innovative biological applications. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 835‐841, 2013 相似文献
10.
Boris A. Trofimov Marina V. Markova Inna V. Tatarinova Al’bina I. Mikhaleva Lyudmila V. Morozova Ol’ga V. Petrova Lyubov’ N. Sobenina Konstantin B. Petrushenko Tamara I. Vakul'skaya Spartak S. Khutsishvili Galina F. Prozorova 《Synthetic Metals》2010,160(23-24):2573-2580
I2-doped and pyrrole ring-iodinated semi-conducting oligomers of N-vinyl-3-alkyl-2-phenylpyrroles have been synthesized by free-radical polymerization of the above monomers (AIBN, 2–5 wt%, 60–80 °C) and further exposure of the oligomers obtained to I2 vapor. The parent oligomers exhibit paramagnetic and fluorescent properties and stable up to 300–370 °C. 相似文献