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排序方式: 共有710条查询结果,搜索用时 328 毫秒
21.
D. G. Gromov S. V. Dubkov A. A. Pavlov S. N. Skorik A. Yu. Trifonov E. P. Kirilenko A. S. Shulyat’ev Yu. P. Shaman B. N. Rygalin 《Semiconductors》2016,50(13):1748-1752
It is shown that it is possible to grow carbon nanotubes on the surface of an amorphous Ni–Ta–N metal alloy film with a low Ni content (~25 at %) by chemical deposition from acetylene at temperature 400–800°C. It is established that the addition of nitrogen into the Ni–Ta alloy composition is favorable for the formation of tantalum nitride and the expulsion of Ni clusters, which act as a catalyst of the growth of carbon nanotubes, onto the surface. From Raman spectroscopy studies, it is found that, as the temperature of synthesis is raised, the quality of nanotubes is improved. 相似文献
22.
A. A. Lebedev M. V. Zamorianskaya S. Yu. Davydov D. A. Kirilenko S. P. Lebedev L. M. Sorokin D. B. Shustov M. P. Scheglov 《Semiconductors》2013,47(11):1539-1543
Transmission electron microscopy and the cathodoluminescence method are used to study the transition region in 3C-SiC/6H-SiC heterostructures. It is shown that this region is, as a rule, constituted by alternating 3C-SiC and 6H-SiC layers with the possible inclusion of other silicon carbide polytypes. An assumption is made that this structure of the transition region can be explained in terms of the model of spinodal decomposition. 相似文献
23.
Steferson Luiz Stares Alina Kirilenko Márcio Celso Fredel Peter Greil Lothar Wondraczek Nahum Travitzky 《Advanced Engineering Materials》2013,15(4):230-237
Porous bioactive glass (BaG) structures were manufactured applying novel preceramic paper process. Preceramic papers were produced for aqueous suspensions loaded with different contents of pulp fiber and BaG filler. Pressure loading was applied in order to increase the packing density in the paper sheets. The paper sheets were sintered at 630 °C for 1 h. The porous glass–ceramic specimens were characterized for density, porosity, composition, microstructure, and mechanical properties. A pronounced volumetric shrinkage was observed, but no surface flaws or inhomogeneous areas were detected. The mechanical strength using the ball on three balls test and elastic modulus of sintered specimens vary between 21 and 33 MPa and 0.30–0.85 GPa, respectively. 相似文献
24.
25.
N. G. Kolmakova A. O. Perov S. L. Senkevich A. A. Kirilenko 《Radioelectronics and Communications Systems》2011,54(3):115-123
Spectral theory is used to explain the effect of propagation through below cutoff holes. Intrinsic oscillations of the corresponding
waveguide and periodic open resonators are studied. Their influence on the frequency characteristic is demonstrated for various
structures: from waveguide to array. 相似文献
26.
V. A. Lutsenko P. A. Bobkov O. M. Kirilenko V. I. Gritsaenko O. V. Lutsenko 《Steel in Translation》2012,42(1):78-80
The introduction of a reduction and calibration unit at a wire mill is recommended for the production of high-carbon wire
rod subjected to thermomechanical treatment with controlled rolling and cooling. By this means, the fluctuation in the mechanical
properties may be reduced. In addition, the decarburized layer will be thinner and uniformly distributed over the perimeter
of the wire rod. As a result, the plasticity of the wire rod in subsequent processing is improved, while the formation of
quench structures at the wire surface in high-speed drawing is practically eliminated. 相似文献
27.
28.
S Agarwal CS Chandra NP Piesco HH Langkamp L Bowen C Baran 《Canadian Metallurgical Quarterly》1998,66(3):932-937
Periodontal ligament (PDL) cells maintain the attachment of the tooth to alveolar bone. These cells reside at a site in which they are challenged frequently by bacterial products and proinflammatory cytokines, such as interleukin-1beta (IL-1beta), during infections. In our initial studies we observed that IL-1beta down-regulates the osteoblast-like characteristics of PDL cells in vitro. Therefore, we examined the functional significance of the loss of the PDL cell's osteoblast-like characteristics during inflammation. In this report we show that, during inflammation, IL-1beta can modulate the phenotypic characteristics of PDL cells to a more functionally significant lipopolysaccharide (LPS)-responsive phenotype. In a healthy periodontium PDL cells exhibit an osteoblast-like phenotype and are unresponsive to gram-negative bacterial LPS. Treatment of PDL cells with IL-1beta inhibits the expression of their osteoblast-like characteristics, as assessed by the failure to express transforming growth factor beta1 (TGF-beta1) and proteins associated with mineralization, such as alkaline phosphatase and osteocalcin. As a consequence of this IL-1beta-induced phenotypic change, PDL cells become responsive to LPS and synthesize proinflammatory cytokines. The IL-1beta-induced phenotypic changes in PDL cells were transient, as removal of IL-1beta from PDL cell cultures resulted in reacquisition of their osteoblast-like characteristics and lack of LPS responsiveness. The IL-1beta-induced phenotypic changes occurred at concentrations that are frequently observed in tissue exudates during periodontal inflammation (0.05 to 5 ng/ml). The results suggest that, during inflammation in vivo, IL-1beta may modulate PDL cell functions, allowing PDL cells to participate directly in the disease process by assuming LPS responsiveness at the expense of their normal structural properties and functions. 相似文献
29.
GB Karlsson M Halloran D Schenten J Lee P Racz K Tenner-Racz J Manola R Gelman B Etemad-Moghadam E Desjardins R Wyatt NP Gerard L Marcon D Margolin J Fanton MK Axthelm NL Letvin J Sodroski 《Canadian Metallurgical Quarterly》1998,188(6):1159-1171
CD4+ T lymphocyte depletion in human immunodeficiency virus type 1 (HIV-1)-infected humans underlies the development of acquired immune deficiency syndrome. Using a model in which rhesus macaques were infected with chimeric simian-human immunodeficiency viruses (SHIVs), we show that both the level of viremia and the structure of the HIV-1 envelope glycoprotein ectodomains individually contributed to the efficiency with which CD4(+) T lymphocytes were depleted. The envelope glycoproteins of recombinant SHIVs that efficiently caused loss of CD4(+) T lymphocytes exhibited increased chemokine receptor binding and membrane-fusing capacity compared with those of less pathogenic viruses. These studies identify the HIV-1 envelope glycoprotein ectodomains as determinants of CD4(+) T lymphocyte loss in vivo and provide a foundation for studying pathogenic mechanisms. 相似文献
30.
Acute dystonia is a common adverse effect following anti-psychotic medication, which mainly appears shortly after beginning treatment or increasing the dosage. Laryngeal dysfunction may carely occur as part of the picture of acute dystonia and, if so, usually with dyspnoea. We describe a case of acute dystonia with atypical onset without relation to changes in dosage and with laryngeal involvement with aphonia, but without dyspnoea. 相似文献