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排序方式: 共有96条查询结果,搜索用时 15 毫秒
1.
Zagidullin S. Kh. Dolganov V. L. Lozhkin I. G. 《Chemical and Petroleum Engineering》2022,57(9-10):765-769
Chemical and Petroleum Engineering - The hydrodynamics of oxidation towers used for bitumen production were studied using a model tower having transparent walls. Experiments were carried out in two... 相似文献
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Luo Manlelan Sliva Andrey P. Hu Renzhi Goncharov Aleksei L. Karpovich Dragunov Viktor Trushnikov Dmitriy N. Pang Shengyong 《Metallurgical and Materials Transactions A》2022,53(9):3369-3380
Metallurgical and Materials Transactions A - Low-frequency scanning electron beam welding (SEBW) is recently recognized as a possible control method for preventing the top concavity behavior in... 相似文献
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Konstantin Zyabrev Marina DekhtyarYurii Vlasenko Alexander ChernegaYurii Slominskii Aleksei Tolmachev 《Dyes and Pigments》2012,92(1):749-757
Synthetic methods have been developed to prepare oxazaborines, the azaanalogues of 2,2-difluoro-1,3,2(2H)dioxaborines, which can form merocyanine dyes. The first oxazaborine merocyanines with the isomeric position of the coordinating nitrogen atom have also been obtained. Comparing the spectral properties of donor-acceptor dioxa- and oxazaborine dyes, it is seen that substitution of the 3-O atom by the NH group in the chelate ring has a slight effect on absorption and fluorescence band positions but causes the intensity redistribution between the 0-0 and 0-1 vibronic absorption peaks and thus induces a change in the absorption band shape due to the enhanced solvation of oxazaborines. Substitution of the 1-O ring atom by the NPh group leads to a bathochromic shift and a manifold increase in the fluorescence quantum yield for the corresponding boron chelate dyes. 相似文献
6.
Di Hu Aleksei Dolganov Mingchan Ma Biyash Bhattacharya Matthew T. Bishop George Z. Chen 《JOM Journal of the Minerals, Metals and Materials Society》2018,70(2):129-137
The Kroll process has been employed for titanium extraction since the 1950s. It is a labour and energy intensive multi-step semi-batch process. The post-extraction processes for making the raw titanium into alloys and products are also excessive, including multiple remelting steps. Invented in the late 1990s, the Fray-Farthing-Chen (FFC) Cambridge process extracts titanium from solid oxides at lower energy consumption via electrochemical reduction in molten salts. Its ability to produce alloys and powders, while retaining the cathode shape also promises energy and material efficient manufacturing. Focusing on titanium and its alloys, this article reviews the recent development of the FFC-Cambridge process in two aspects, (1) resource and process sustainability and (2) advanced post-extraction processing. 相似文献
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Ideas, hopes, and disappointments related to a quarter-century research into the laws of power industry development and its
relations with society are reviewed; new hypotheses concerning the character and characteristics of these relations are formulated,
and some preliminary results of the quantitative verification of these hypotheses are presented. The scope of future investigations
is outlined and difficulties encountered in the attempts to collect the necessary retrospective information are considered. 相似文献
9.
Vladislav Sadykov Natalia MezentsevaVladimir Usoltsev Ekaterina SadovskayaArkady Ishchenko Svetlana PavlovaYulia Bespalko Tamara KharlamovaEkaterina Zevak Aleksei SalanovTamara Krieger Vladimir BelyaevOleg Bobrenok Nikolai UvarovYury Okhlupin Oleg SmorygoAlevtina Smirnova Prabhakar SinghAleksandr Vlasov Mikhail KorobeynikovAleksandr Bryazgin Peter KalininAndrei Arzhannikov 《Journal of power sources》2011,196(17):7104-7109
This work presents the results related to the functionally graded fluorite (F)-perovskite (P) nanocomposite cathodes for IT SOFC. Nanocrystalline fluorites (GDC, ScCeSZ) and perovskites (LSrMn, LSrFNi) were synthesized by Pechini method. Nanocomposites were prepared by the ultrasonic dispersion of F and P powders in isopropanol with addition of polyvinyl butyral. Different techniques for deposition and sintering of functionally graded cathode materials were applied including traditional approaches as well as original methods, such as radiation-thermal sintering under electron beam or microwave radiation. Morphology, microstructure and elemental composition of nanocomposites was characterized by XRD and HRTEM/SEM with EDX. Even for dense composites, the sizes of perovskite and fluorite domains remain in the nanorange providing developed P-F interfaces. Oxygen isotope heteroexchange and conductivity/weight relaxation studies demonstrated that these interfaces provide a path for fast oxygen diffusion. The redistribution of the elements between P and F phases in nanocomposites occurs without formation of insulating zirconate phases. Button-size fuel cells with nanocomposite functionally graded cathodes, thin YSZ layers and anode Ni/YSZ cermet (either bulk or supported on Ni-Al foam substrates) were manufactured. For optimized composition and functionally graded design of P-F nanocomposite cathodes, a stable performance in the intermediate temperature range with maximum power density up to 0.5 W cm−2 at 700 °C in wet H2/air feeds was demonstrated. 相似文献
10.
Aleksei B. Burdukov Mikhail A. Vershinin Ilya V. Eltsov Nataliya V. Pervukhina Yan Z. Voloshin 《Inorganic chemistry communications》2009,12(9):919-922
The controlled hydrolysis of the dichlorine-containing iron(II) clathrochelate FeBd2(Cl2Gm)(BF)2 precursor (where Bd2− and Cl2Gm2− are α-benzyldioxime and dichloroglyoxime dianions, respectively) afforded the hydroxy-containing clathrochelate derivatives with the hydroxyl substituent inherently bound to the ribbed chelate fragment of the macrobicyclic ligand. The triethylammonium and tetra-n-butylammonium salts of the clathrochelate [FeBd2(OClGm)(BF)2]− anion have been characterized using elemental analysis, MALDI-TOF mass spectrometry, IR, UV–Vis, 57Fe Mössbauer and 1H, 13C{1H}, 11B and 19F NMR spectroscopies, and X-ray crystallography. The X-ray structural data for this deprotonated anion showed strong delocalization of its negative charge into the clathrochelate framework. 相似文献