排序方式: 共有30条查询结果,搜索用时 343 毫秒
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Rajivgandhi Govindan Nadar Chenthis Kanisha Chelliah Vijayakumar Sekar Alharbi Naiyf S. Kadaikunnan Shine Khaled Jamal M. Alanzi Khalid F. Li Wen-Jun 《Journal of Inorganic and Organometallic Polymers and Materials》2021,31(10):3921-3933
Journal of Inorganic and Organometallic Polymers and Materials - The silver oxide nanoparticle was successfully synthesized using floral waste by simple one pot, cost effective method. The complete... 相似文献
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Experimental studies have been carried out on hydrocarbon group analysis of commercial Arabian crude oil fractions corresponding to the true boiling point ranges or 200-400 ast;F, 400-500 *F 500-650 *F, 650-850 *F, and 850 *F-K The crude oils included Arab heavy (API* = 28·0), Arab medium (API* = 30·0), Arab light (API* = 33·3), and Arab Berry extra light (API* = 36*9). Waters Hydrocabon Group Analyzer (HGA) system interfaced with model 730 Data Module has been used to obtain the compositional analysis in terms of saturates, neutral aromatics, polar aromatics and asphaltcnes. 相似文献
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Strength of Materials - This paper considers both likelihood and Bayesian estimations of a constant-stress partially accelerated life test model with type-I censored data from the linear failure... 相似文献
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Strength of Materials - In this article, a constant-stress partially accelerated life test model of high reliability products and materials with type-II censored data from the linear failure rate... 相似文献
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Riyas Sharafudeen Jihad Mohammed Al-Hashim Mohammed Olian Al-Harbi Ahmed Ibrahim Al-Ajwad Ali Abdulaziz Al-Waheed 《SILICON》2017,9(6):917-922
The present study reveals a cost benefit process in an open system for utilizing desert sand for preparing sodium silicate or precipitated silica. A simple alkali fusion method has been developed to prepare sodium silicate directly from sand and finally pure precipitated silica by acid precipitation. The reaction weight ratio of alkali to sand reaction parameters are studied for optimizing the silica yield. About 80% pure precipitated silica has been prepared in an open system at 150 °C within 45 min. Wet chemical methods, FTIR, TG-DTA, XRD and SEM techniques are used to characterize the silica prepared from sand available in Saudi Arabian deserts. In the XRD pattern, the peak corresponding to silica was obtained at the diffraction angle of 21.8 ° and it was found to be amorphous in nature. 相似文献
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Strength of Materials - In this article, the case of failure-censored constant-stress partially accelerated life test for highly reliable materials or devices assuming the linear failure rate... 相似文献
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Based on local raw materials, a range of LiZnMg aluminosilicate glasses were prepared to investigate the influence of TiO2, Cr2O3, and ZrO2 on the crystallization behaviour and thermal expansion characteristics. Differential thermal analysis showed that the crystallization propensity increases in the order TiO2 > Cr2O3 > ZrO2. Virgilite, β-spodumene ss, gahnite, enstatite and cristobalite were formed in the prepared glass-ceramics. The microstructure of glass-ceramic samples showed growths of rounded and subrounded grains in the base sample, whereas, somewhat rod-like and accumulated growths appeared in samples containing ZrO2. However, a rather homogeneous texture of accumulated growths was developed in glass-ceramics containing TiO2 and Cr2O3. The coefficient of thermal expansion of parent glasses was sensitive to the type of nucleating agent added (Cr2O3 > TiO2 > ZrO2) varying from 24.8 × 10−7 to 65.1 × 10−7 °C−1 being almost unchanged with the heat-treatment. The microhardness values of glass-ceramic samples were in the 763–779 kg/mm2 range. 相似文献
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Al-Dossary O Umar A Al-Harbi AA Zaidi SA Dar GN 《Journal of nanoscience and nanotechnology》2012,12(8):6368-6373
A facile, reliable, reproducible and ultra-high sensitive aqueous ammonia chemical sensor has been fabricated based on the utilization of La(0.7)Sr(0.3)MnO3 nanoparticles (LSMO NPs), as efficient electron mediators, and reported in this paper. The LSMO NPs were prepared by hydrothermal protocol followed by the annealing process and characterized in detail in terms of their mophological, structural and compositional properties. The I-V technique based aqueous ammonia sensor exhibits an ultra-high sensitivity of 494.68 +/- 0.01 microA cm(-2)mM(-1) and very low-detection limit of 0.2 microM with a response time less than 10 s. To the best of our knowledge, this is the first report in which LSMO is used as an efficient electron mediator for the fabrication of aqueous ammonia chemical sensor. Moreover, by comparing the literature, it is confirmed that the fabricated sensor exhibits highest sensitivity towards the detection of aqueous ammonia. This LSMO nanomaterial based research broadens the range of efficient electron mediators utilized for the fabrication of ultra-high sensitive chemical sensors. 相似文献
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D. K. Al-Harbi M. J. Assael L. Karagiannidis W. A. Wakeham 《International Journal of Thermophysics》1991,12(1):17-25
This paper reports the results of new, absolute measurements of thermal conductivity of isopentane in the temperature range 307–335 K at pressures up to 0.4 GPa. The experimental data have an estimated uncertainty of ±0.3%. The density dependence of the thermal conductivity along the various isotherms has been represented with the aid of a single universal equation derived for a series of alkanes and based upon the hard-sphere model of dense fluids. An even more general prediction scheme for the thermal conductivity of liquids developed initially for normal alkanes is found to predict the present data within ±5%. 相似文献