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排序方式: 共有47条查询结果,搜索用时 31 毫秒
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Sania Saheli Ali Reza Rezvani Azim Malekzadeh Michal Dusek Vaclav Eigner 《International Journal of Hydrogen Energy》2018,43(2):685-694
The silica- and alumina-supported Co–Zn catalysts were synthesized by thermal decomposition of new inorganic precursors [Co4.32Zn1.68(HCO2)18(C2H8N)6]/SiO2 or Al2O3. A novel coordination polymer formulated as [Co4.32Zn1.68(HCO2)18(C2H8N)6] (1) was prepared using the solvothermal technique and characterized by elemental analysis, FT-infrared spectroscopy. Thermal stability of the complex 1 was investigated by thermogravimetric analysis and differential scanning calorimetry, and its structure was determined by single-crystal X-ray diffraction. Characterization of catalysts was carried out using powder X-ray diffraction (XRD), scanning electron microscopy (SEM), and BET specific surface area. The catalysts were evaluated for Fischer–Tropsch synthesis (FTS) in the temperature range 200–300 °C. The results revealed that the synthesized catalysts have higher selectivity to the desired products at 260 °C. The performance of the catalysts was compared to those of catalysts constructed via impregnation method and the fabricated catalysts show higher activity and selectivity than the reference catalysts. 相似文献
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Bond Kenneth; Ospina Maria B.; Hooton Nicola; Bialy Liza; Dryden Donna M.; Buscemi Nina; Shannahoff-Khalsa David; Dusek Jeffrey; Carlson Linda E. 《Canadian Metallurgical Quarterly》2009,1(2):129
The authors used a 5-round Delphi study with a panel of 7 experts in meditation research to achieve agreement on a set of criteria for a working definition of “meditation” for use in a comprehensive systematic review of the therapeutic use of meditation. Participants agreed that essential to a meditation practice is its use of (a) a defined technique, (b) logic relaxation, and (c) a self-induced state. Participants also agreed that a meditation practice may (d) involve a state of psychophysical relaxation somewhere in the process; (e) use a self-focus skill or anchor; (f) involve an altered state/mode of consciousness, mystic experience, enlightenment or suspension of logical thought processes; (g) be embedded in a religious/spiritual/philosophical context; or (h) involve an experience of mental silence. The results of this study provide insight into the challenges faced by researchers who want to demarcate meditative practices from nonmeditative practices, and they describe an approach to this problem that may prove useful for researchers trying to operationalize meditation in the context of comparative research. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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M Dusek 《Canadian Metallurgical Quarterly》1998,77(8):360-363
The submitted investigation deals with the first experiences with duplex sonography using to evaluate the superficial vein system on patients before aortocoronary bypass grafting. We examined 40 patients. In all cases we already could evaluate the quality of vein bed (diameter, anatomy, pathology) before operation and we could determine the best part of vein bed for harvesting. The advantages of this noninvasive method are smaller number of incisions (it results in better healing with less wound infectious complications), better quality and shorter time of harvesting. 相似文献
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J Huybrechts K Dusek 《Surface Coatings International Part B: Coatings Transactions》1998,81(3):117-127
Conclusion Hydroxyl functional star oligomers prepared by ring-opening polycondensation have a narrow molecular weight and composition
distribution. Such oligomers give a solids/viscosity advantage over linear structures at the same molecular weight and can
be used in low VOC two component polyurethane coatings. The solids/viscosity advantage is a combination of the highly branched
structure and the narrow molecular weight distribution. Acrylic polyols formulated at the same molecular weight/polarity/average
functionality and hydroxyl value give poorer drying properties. This difference can be explained by the fact that the free
radical polymerisation technique leads to polymer compositions having a broad molecular weight and functionality distribution
and high fractions of polymer with a low functionality. The potlife of acrylic polyols based formulations is adversely affected
by the higher fractions of high molecular weight material and with a high average functionality. In low VOC polyurethane formulations
star oligomers need to be formulated within a narrow range of compositions (TG, polarity), functionality and molecular weight
to get an optimum balance of drying properties and potlife. 相似文献
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Stephen Ridout Milos Dusek Chris Bailey Chris Hunt 《Microelectronics Reliability》2006,46(12):2122-2130
This paper presents both modelling and experimental test data to characterise the performance of four non-destructive tests. The focus is on determining the presence and rough magnitude of thermal fatigue cracks within the solder joints for a surface mount resistor on a strip of FR4 PCB. The tests all operate by applying mechanical loads to the PCB and monitoring the strain response at the top of the resistor. The modelling results show that of the four tests investigated, three are sensitive to the presence of a crack in the joint and its magnitude. Hence these tests show promise in being able to detect cracking caused by accelerated testing. The experimental data supports these results although more validation is required. 相似文献
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The interactions between drugs suppressing the production of arachidonic acid metabolites-eicosanoids and transforming growth factor beta 1 (TGF-beta 1) were investigated using CCL64 cells. These experiments, designed as complete factorial combination of treatments, demonstrated that both esculetin and eicosatetraynoic acid significantly potentiated the inhibitory effect of TGF-beta 1 on [3H]thymidine incorporation. The expression of overadditive effects depended both on the type and concentration of combined factors. These results corresponded with cell cycle analysis data (increased cell number in G1 and decreased cell number in S and G2/M phases) and with the results monitoring cell number following treatment with eicosatetraynoic acid, esculetin, 3-[1-(4-chlorobenzyl)-3-t-butyl-thio-5-isopropylindol-2-yl]-2,2-di methyl propanoic acid (MK-886) and indomethacin. Summarizing, the degree of significance of combined effects supports the hypothesis of synergistic potentiation of TGF-beta 1 effects caused by eicosanoid inhibitors. The results indicate that either the lack of some eicosanoids or a certain type of misbalance in the metabolism of arachidonic acid leading to its abundance might modulate TGF-beta 1 effects on the cell cycle and proliferation in CCL64 cells. 相似文献
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