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101.
Shevchenko Alexey V. Dudnik Elena V. Ruban Alexey K. Red'ko Viktor P. Lopato Lidiya M. 《Powder Metallurgy and Metal Ceramics》2002,41(11-12):558-563
An 80 mass% ZrO2 ― 20 mass% Al2O3 powder was produced using a complex method which integrates sol-gel technology and hydrothermal synthesis. The specific surface areas of the powder varied from 39 to 5.3 m2/g depending on the thermal treatment conditions. Metastable F-ZrO2 formed after powder annealing at 400°C. The phase transformation F-ZrO2 → T-ZrO2 (traces of M-ZrO2) occurred under powder thermal treatment from 700 to 1000°C. Only Θ-Al2O3 was detected under experimental conditions. The powder was characterized by sintering activity. Operating the processes under powder thermal treatment in the ZrO2 ― Y2O3 ― CeO2 ― Al2O3 system will allow one to produce a variety of ceramic microstructures from fine-grained to “self-reinforced.” These powders can be used in manufacturing surgical cutting tools as well as in ceramic passive bioimplants and solid electrolytes for fuel elements. 相似文献
102.
V. F. Muzhitskii A. G. Efimov A. E. Shubochkin A. M. Sysoev 《Russian Journal of Nondestructive Testing》2007,43(10):700-707
The scope of application, specific features of design and operation, and the main technical characteristics of portable BΔ-12HΦM and BΔ-12HΦΠ eddy-current flaw detectors are considered. 相似文献
103.
Alexei V. Shevchenko Elena V. Dudnik Alexei K. Ruban Vladimir M. Vereshchaka Viktor P. Red’ko Lidiya M. Lopato 《Powder Metallurgy and Metal Ceramics》2005,44(3-4):105-111
The properties of ZrO2 - 3 mole% Y2O3 nanocrystalline powder prepared by diffusion impregnation are studied. The original nanocrystalline powder of M-ZrO2 is prepared with hydrothermal treatment of aqueous zirconium hydroxychloride solution by different regimes. It is found that after diffusion impregnation for all of the powders with yttrium oxide two solid solutions are formed (F-ZrO2 and M-ZrO2) in mixture. It is established that the morphological features typical for the original powders are retained. The efficiency of diffusion impregnation is determined by the slightly-agglomerated powder with a high degree of crystallinity.__________Translated from Poroshkovaya Metallurgiya, Nos. 3–4(442), pp. 3–11, March–April, 2005. 相似文献
104.
V. P. Efimov 《Journal of Mining Science》2007,43(6):600-606
The test data are presented for tensile and compressive strength of some rocks depending on the rate of loading by three-point
bending and then uniaxial rigid compression. The constants of Zhurkov’s kinetic equation of durability are determined for
the tested rocks.
__________
Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 6, pp. 37–44, November–December, 2007. 相似文献
105.
106.
Viktor Dan’ko Katerina Michailovska Ivan Indutnyi Petro Shepeliavyi 《Nanoscale research letters》2014,9(1):165
We investigated plasmon-assisted enhancement of emission from silicon nanoparticles (ncs-Si) embedded into porous SiO
x
matrix in the 500- to 820-nm wavelength range. In the presence in the near-surface region of gold nanoisland film, ncs-Si exhibited up to twofold luminescence enhancement at emission frequencies that correspond to the plasmon resonance frequency of Au nanoparticles. Enhancement of the photoluminescence (PL) intensity was attributed to coupling with the localized surface plasmons (LSPs) excited in Au nanoparticles and to increase in the radiative decay rate of ncs-Si. It has been shown that spontaneous emission decay rate of ncs-Si modified by thin Au film over the wide emission spectral range was accelerated. The emission decay rate distribution was determined by fitting the experimental decay curves to the stretched exponential model. The observed increase of the PL decay rate distribution width for the Au-coated nc-Si-SiO
x
sample in comparison with the uncoated one was explained by fluctuations in the surface-plasmon excitation rate.
PACS
78. 67. Bf; 78.55.-m 相似文献107.
Tissue Adhesives: Linear Dendritic Block Copolymers as Promising Biomaterials for the Manufacturing of Soft Tissue Adhesive Patches Using Visible Light Initiated Thiol–Ene Coupling Chemistry (Adv. Funct. Mater. 42/2015)
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108.
Comprehensive exploration of the viscoelastic properties of polyaniline films exposed to aqueous perchloric acid has been made as a function of applied potential (E), temperature (T), and mechanical oscillation frequency (f = ω/2π) using high-frequency acoustic wave resonators. The outcomes are expressed in terms of storage and loss shear modulus signatures, G'(E, T, ω) and G″(E, T, ω). Surprisingly, these are barely sensitive to potential, through which both polymer charge and solvation are manipulated, and only modestly sensitive to temperature. In contrast, the response to timescale is dramatic. Using the principle of time-temperature superposition, G' and G″ at different temperatures and frequencies (time scales) can each be placed on master relaxation curves. Models developed for mechanical properties of bulk polymers at low frequency were applied to these thin film responses at high frequency. These include the Williams-Landel-Ferry model, the activation model, and the Rouse-Zimm model based, respectively, on concepts of free volume, thermal activation, and relaxation. Each of the models could be applied with physically reasonable outcomes in terms of the relevant parameters (thermal expansion coefficient, glass transition temperature, and activation enthalpy). G' and G″ values are correlated with solvent content. The enthalpy change for solvent entry is small, positive and relatively independent of polymer charge state, all of which contrast sharply with the behavior of thiophene-based conducting polymers in organic solvents. 相似文献
109.
俄罗斯有150多家酒精工厂,工厂平均年产量1万t左右,主要原料为大麦、小麦、玉米和黑麦等。俄罗斯食品生物技术科学研究所是俄罗斯研究酒精生产、酶制剂和酵母的权威机构,该所开发的酒精生产工艺在世界上处于领先地位。其主要技术成果包括:65~80℃低温蒸煮,双酶法糖化,28~38℃中高温快速浓醪发酵,蒸馏废水回用等项技术;其中机械涡流均质是一项有效的节能技术,可节约能耗20%左右。 相似文献
110.