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排序方式: 共有639条查询结果,搜索用时 15 毫秒
631.
Novel glass-ceramics of the nominal molar compositions 20Fe2O3·20B2O3·(60-x)V2O5· (xNa2O or xSrO) (where x?=?0 or 10) were prepared by traditional melt technique. Differential thermal analysis (DTA) was implemented to study the thermal behavior of the prepared glasses. Vanadium pentoxide (V2O5), iron vanadate (FeVO4), sodium vanadate (Na3VO4) and strontium vanadate (with different formulae) were crystallized and identified by X-ray diffraction (XRD) analysis under certain conditions of heat-treatment. Further characterization of glass and glass ceramics samples were performed using scanning electron microscope (SEM), density, electrical and dielectric measurements. In conclusion, our study elucidated that the substitution of vanadium by Na+ and Sr2+ ions enhanced the conductivity at 180?°C from 5.11?×?10?4 for unmodified glass to 2.93?×?10?3 and 1.03?×?10?2?S?cm?1 for Na- and Sr-modified glasses. 相似文献
632.
Ebru Erünal Fatma Ulusal Mustafa Y. Aslan Bilgehan Güzel Deniz Üner 《International Journal of Hydrogen Energy》2018,43(23):10755-10764
Pd doped Multi-Walled Carbon Nanotubes were prepared via supercritical carbon dioxide deposition method in order to enhance the hydrogen uptake capacity of carbon nanotubes at ambient conditions. A new bipyridyl precursor that enables reduction at moderate conditions was used during preparation of the sample. Both XRD analyses and TEM images confirmed that average Pd nanoparticle size distribution was around 10 nm. Hydrogen adsorption and desorption experiments at room temperature with very low pressures (0–0.133 bar) were conducted together with temperature programmed desorption (TPD) and reduction (TPR) experiments on undoped and doped materials to understand the complete hydrogen uptake profile of the materials. TPD experiments showed that Pd nanoparticles increased the hydrogen desorption activity at moderate temperatures around at 38 °C while for undoped materials it was determined around at 600 °C. Moreover, a drastic enhancement of hydrogen storage was recorded from 44 μmol/g sample for undoped material to 737 μmol/g sample for doped material through adsorption/desorption isotherms at room temperature. This enhancement, also verified by TPR, was attributed to spillover effect. 相似文献
633.
The catalyst level of the ebullated-bed is an important process indicator in operating the H-oil hydrotreating unit in Shuaiba Refinery, Kuwait National Petroleum Company (KNPC). In an attempt to use mixed hydrotreating catalysts in one of the H-oil reactors, the catalyst bed expanded more than usual, and the level was very unstable. Moreover, a reduced unit performance and unstable operations were resulted, which led to the unit shut down and process time loss. In a joint study between the Petroleum Technology Department at Kuwait Institute for Scientific Research (KISR) and KNPC, the hydrodynamics of the mixed and individual catalysts in a cold flow ebullated-bed reactor (EBR) were found to be very different, though the two catalysts had similar physical properties. Further study revealed that catalyst attrition was a very important factor in contributing such reactor behaviours. 相似文献
634.
Silicon - Mesoporous silica nanoparticles (MSNs) are fascinating due to their interesting properties and applications. The optimization of MSNs for drug delivery applications was achieved by... 相似文献
635.
Silicon - We investigate an appropriate material for the optimisation of Back Surface Field (BSF) layer in Heterojunction with Intrinsic thin layer (HIT) solar cells:... 相似文献
636.
Mobarak M. Nassary M. M. Gami Fatma Mostafa Massaud 《Journal of Materials Science: Materials in Electronics》2022,33(13):10278-10286
Journal of Materials Science: Materials in Electronics - A technique based on the Bridgman method was used to make single crystals of AgInS2. X-ray diffraction was used to determine the crystal... 相似文献
637.
Al-Sayed Samar Reda Samad Fatma Abdel Mohamed Tarek Youssef Doaa 《Metallurgical and Materials Transactions A》2022,53(10):3639-3653
Metallurgical and Materials Transactions A - This study was performed to characterize surface topography and microhardness of 40 wt pct NiCrBSiC-60 wt pct WC hard coating on TC4 titanium after... 相似文献
638.
Nadia R. Guirguis Boshra M. Awad Fatma A. A. El-Mariah 《Advanced Synthesis \u0026amp; Catalysis》1989,331(1):22-30
The condensation of naphthalene-1- or 2-carbaldehyde with dimethyl 2,2-dimethyl-succinate (Stobbe conditions) gives predominantly the ( Z )-hemiesters 3 and 11a . The hemiester 3 contains a small amount of the ( E )-isomer. Similar condensation of naphthalene-2-carbaldehyde with dimethyl-2-methylsuccinate gave the hemiester ( E )- 12a . Their configuration and the ratios of the ( Z:E )-hemiesters, their derived acids, anhydrides, indenones and phenanthrene derivatives are inferred by high resolution 1H-n.m.r. spectroscopy. 相似文献
639.
Nadia Sobhy Ibrahim Hoda Zaki Shams Fatma Abd El-Maksoud Abd El-Aal Mohamed Hilmy Elnagdi 《Advanced Synthesis \u0026amp; Catalysis》1987,329(4):552-556
The reaction of 3-amino-2,4-diethoxycarbonylcrotononitrile with cinnamonitrile derivatives afforded the pyrimidines 5a--d and not the pyridines 4 as expected from literature. Similarly pyrimidines 5e--h were produced when 3-amino-2,4-dicyanocrotononitrile was treated with the same reagent. The structure was established based on MS and high resolution 1H-n.m.r. spectroscopy. 相似文献