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排序方式: 共有164条查询结果,搜索用时 31 毫秒
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L. I. Podzorova A. A. Il’yicheva O. I. Pen’kova L. I. Shvorneva 《Glass Physics and Chemistry》2014,40(5):584-590
The results of the investigations on the influence of CeO2 adding on the transformation of the metastable Al2O3 forms obtained by thermal treatment of xerogels are presented. It is established that in the presence of CeO2 the process of the formation of a stable phase of α-Al2O3 (corundum) takes place in a wider temperature range and is accomplished at a higher temperature (1300°C). It is suggested that the revealed mismatches on the diffractograms between the intensity values of the main analytical peaks of the corundum and its content in the samples are associated with the effect of screening caused by the differences in the mass coefficients of absorption of (μ) CeO2 and Al2O3. 相似文献
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This paper formulates the problem of real-time estimation of traffic state in freeway networks by means of the particle filtering framework. A particle filter (PF) is developed based on a recently proposed speed-extended cell-transmission model of freeway traffic. The freeway is considered as a network of components representing different freeway stretches called segments. The evolution of the traffic in a segment is modelled as a dynamic stochastic system, influenced by states of neighbour segments. Measurements are received only at boundaries between some segments and averaged within possibly irregular time intervals. This limits the measurement update in the PF to only these time instants when a new measurement arrives, while in between measurement updates any simulation model can be used to describe the evolution of the particles. The PF performance is validated and evaluated using synthetic and real traffic data from a Belgian freeway. An unscented Kalman filter is also presented. A comparison of the PF with the unscented Kalman filter is performed with respect to accuracy and complexity. 相似文献
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L. I. Podzorova A. A. Il'icheva N. A. Mikhailina V. Ya. Shevchenko L. I. Shvorneva 《Inorganic Materials》2002,38(12):1235-1240
Data are presented on the phase composition of ZrO2–Al2O3–CeO2 powders containing 10, 30, and 70 mol %, prepared via coprecipitation and successive precipitation. The precipitation procedure is shown to have a strong effect on the phase composition of the heat-treated powders and the state (inter- or intracrystalline) of the T-ZrO2 phase, thereby changing its stability. At an Al2O3 content of 30 mol %, the M-ZrO2 content is independent of the precipitation procedure. 相似文献
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Irina V. Ovsienko Lyudmila Yu. Matzuy Nykolai I. Zakharenko Nykolai G. Babich Tetyana A. Len Yuriy I. Prylutskyy David Hui Yuri M. Strzhemechny Peter C. Eklund 《Nanoscale research letters》2008,3(2):60-64
It is shown that magnetometry can be employed as an effective tool to control the content of a ferromagnetic constituent in
nanocarbon materials. We propose a thermochemical treatment protocol to achieve extensive cleaning of the source nanocarbon
materials from ferromagnetic refuses. 相似文献
8.
Lyudmila L. Lyubimova Roman N. Fisenko Alexander A. Tashlykov Roman B. Tabakaev 《Metals and Materials International》2018,24(1):121-129
This work deals with the problems of structural regeneration by thermal restoration treatment (TRT). These include the lack of a structural sign showing that TRT is possible, a consensus on TRT modes, the data on the necessary relaxation depth of residual stresses, or criteria of structural restoration. Performing a TRT without solving these problems may deteriorate the properties of steel or even accelerate its destruction. With this in view, the purpose of this work is to determine experimentally how the residual stress state changes under thermal and mechanical loads in order to specify the signs of the restoration of structure and structural stability. The object of this research is unused 12Cr1MoV steel that has been aged naturally for 13 years. Using X-ray dosimetry with X-ray spectral analysis, we study the distribution of internal residual stresses of the first kind during the repeated hot deformation. After repeated thermal deformation, the sample under study transforms from a viscoelastic Maxwell material into a Kelvin-Voigt material, which facilitates structural stabilization. A sign of this is the relaxation limit increase, prevention of continuous decay of an α-solid solution of iron and restoration of the lattice parameter. 相似文献
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Synthesis and gas permeation parameters of metathesis polytricyclononenes with pendant Me3E‐groups (E = C,Si, Ge) 下载免费PDF全文
Maxim Bermeshev Boris Bulgakov Lyudmila Starannikova Georgii Dibrov Pavel Chapala Dmitry Demchuk Yurii Yampolskii Eugene Finkelshtein 《应用聚合物科学杂志》2015,132(5)
Metathesis polytricyclononenes were synthesized via ROMP polymerization in the presence of the 1‐st generation Grubbs catalyst and their gas‐transport properties were studied for the first time. The aim of this work was to evaluate the influence of Me3E‐groups (E = C, Si, Ge) on gas permeation parameters of ROMP materials. New metathesis poly(3‐tert‐butyltricyclononene‐7) and poly(3‐trimethylgermyltricyclononene‐7) were obtained with high yields (up to 95%) and high‐molecular weights (Mw~3–7×105 g mol?1). The glass transition temperatures of the ROMP polytricyclononenes with Me3E‐groups decreased when E was changed from C to Si and then to Ge. It was shown that the polytricyclononene containing Me3Si‐groups has the highest gas permeability while the polytricyclononene containing Me3C‐substituents has the lowest gas permeability. In addition, the gas permeation parameters were estimated for ROMP Me3Si‐ and Me3Ge‐substituted polytricyclonona‐3,7‐dienes. So the influence of the second double bond in the monomer units on the permeability of the polymers obtained was studied. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 41395. 相似文献
10.
Vladislav Sadykov Vladimir Sobyanin Natalia Mezentseva Zakhar Vostrikov Vladimir Pelipenko Sergey Tikhov Lyudmila Bobrova Julian R.H. Ross Vladimir Ulyanitskii 《Fuel》2010,89(6):1230-180
Active components comprised of fluorite-like Lnx(Ce0.5Zr0.5)1−xO2−y (Ln = La, Pr, Sm) and perovskite-like La0.8Pr0.2Mn0.2Cr0.8O3 mixed oxides and their composites with yttria-doped zirconia (YSZ) promoted by precious metals (Pt, Ru) and/or Ni were supported on several types of heat-conducting substrates (compressed Ni-Al foam, Fecralloy foil or gauze protected by corundum layer, Cr-Al-O microchannel cermets, titanium platelets protected by oxidic layer) as well as on honeycomb corundum monolithic substrate. These structured catalysts were tested in pilot-scale reactors in the reactions of steam reforming of methane, selective oxidation of decane and gasoline and steam/autothermal reforming of biofuels (ethanol, acetone, anisole, sunflower oil). Applied procedures of supporting nanocomposite active components on monolithic/structured substrates did not deteriorate their coking stability in real feeds with a small excess of oxidants, which was reflected in good middle-term (up to 200 h) performance stability promising for further up-scaling and long-term tests. Equilibrium yield of syngas at short contact times was achieved by partial oxidation of decane and gasoline without addition of steam usually required to prevent coking. For the first time possibility of successive transformation of biofuels (ethanol, acetone, anisole, sunflower oil) into syngas at short contact times on monolithic catalysts was demonstrated. This was provided by a proper combination of active component, thermal conducting monolithic substrates and unique evaporation/mixing unit used in this research. 相似文献