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Catalytic dehydration of methanol to dimethyl ether (DME) over Al-HMS catalysts
Behrouz Sabour,Mohammad Hassan Peyrovi,Touba Hamoule,Mehdi Rashidzadeh 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.1
A series of Al-HMS with different Si/Al ratio was used as a solid acid catalyst for methanol dehydration todimethyl ether (DME). The effect of temperature, feed composition, space velocity, and the catalyst Si/Alratio on the catalytic dehydration of methanol was investigated. By decreasing Si/Al, the temperaturerequired to reach equilibrium conversion of methanol decreased due to the increased number of acidicsites. Compared to commercial γ-Al2O3, Al-HMS-5 and Al-HMS-10, catalysts exhibited a high yield ofDME. Among all Al-HMS catalysts, Al-HMS-10 exhibited an optimum yield of 89% with 100% selectivityand excellent stability for methanol dehydration to DME.
Abdel-Sabour, A.G.,Obiadalla-Ali, H.A.,AbdelRehim, K.A. 한국작물학회 2010 Journal of crop science and biotechnology Vol.13 No.1
The objective of this work was to evaluate the genetic variability among six cowpea (Vigna unguiculata) cultivars differing in their resistance to Callosobruchus maculatus (F.) weevil. Two resistant bean cultivars were used to compare between the sensitive, moderate tolerant, and high tolerant cowpea cultivars. The differentiations were performed by using random amplified polymorphic DNA (RAPD) fingerprinting, protein concentration and organic and non-organic components in seed coat. Six polymorphic primers were identified, resulting in different informative bands. Based on polymorphic profiles, three clusters were formed. Clustering was mainly affected by the resistance to weevil pest. The sensitive cowpea cultivars were separated in one group, the moderate tolerant and high tolerant cultivars came in separate groups, and finally, the resistant bean cultivars separated clearly in one distinct group. The most interesting result was represented by concentration of total protein in the seed coat. The protein concentration in the resistant bean cultivars were approximately 50% less than concentration in each of the moderate tolerant and sensitive cultivars of cowpea. Ferric ions were about 25% less than the moderate tolerant and sensitive cultivars. The concentrations of calcium and potassium in seed coats were higher in the resistant beans than in cowpea cultivars. Cobalt was about four times higher in resistant bean than in the sensitive and moderate tolerant cowpea cultivars, which may play a major role in seed resistance to weevil.
A. G. Abdel-Sabour,H. A. Obiadalla-Ali,K. A. AbdelRehim 한국작물학회 2010 Journal of crop science and biotechnology Vol.13 No.1
The objective of this work was to evaluate the genetic variability among six cowpea (Vigna unguiculata) cultivars differing in their resistance to Callosobruchus maculatus (F.) weevil. Two resistant bean cultivars were used to compare between the sensitive,moderate tolerant, and high tolerant cowpea cultivars. The differentiations were performed by using random amplified polymorphic DNA (RAPD) fingerprinting, protein concentration and organic and non-organic components in seed coat. Six polymorphic primers were identified, resulting in different informative bands. Based on polymorphic profiles, three clusters were formed. Clustering was mainly affected by the resistance to weevil pest. The sensitive cowpea cultivars were separated in one group, the moderate tolerant and high tolerant cultivars came in separate groups, and finally, the resistant bean cultivars separated clearly in one distinct group. The most interesting result was represented by concentration of total protein in the seed coat. The protein concentration in the resistant bean cultivars were approximately 50% less than concentration in each of the moderate tolerant and sensitive cultivars of cowpea. Ferric ions were about 25% less than the moderate tolerant and sensitive cultivars. The concentrations of calcium and potassium in seed coats were higher in the resistant beans than in cowpea cultivars. Cobalt was about four times higher in resistant bean than in the sensitive and moderate tolerant cowpea cultivars, which may play a major role in seed resistance to weevil.
Shokri Morteza,Sabour Mohammadreza 대한토목학회 2014 KSCE JOURNAL OF CIVIL ENGINEERING Vol.18 No.2
This paper aims to cast light on the coefficients of non-linear equation governing unsteady turbulent flow through coarse porousmedia commonly known as Forchheimer’s equation. Experimental pilot made use of a physical model consisting of a flume of 13 mlength, being controlled by an electro-mechanical device to create different types of flow regimes. A range of granular media with amean diameter of 7.5 mm for Small crashed (Sc) to 14 mm for Medium crashed (Mc) were packed in the flume at different runs tosimulate coarse porous media capable of sustaining turbulent flow, either unsteady or steady. Findings indicate that: coefficient of thelinear flow term decreases (47.3% and 91.9% in Sc and Mc aggregate) with increasing mean grain size, respectively. In addition,coefficient of the turbulent term-the effects of inertia forces-increases (87.9% and 27.2% in Sc and Mc aggregate) with increasingmean grain size, respectively. Furthermore, coefficient of the unsteady term-local acceleration term in the Forchheimer’s equationshowsa rapid increase (146.9% in Sc and 125.6% in Mc) with increasing velocity. Moreover, the nature of hydraulic gradient (i)variations versus Reynolds number (Re) - which were plotted for all sets of observations-confirms the existence of turbulentconditions in most experiments. Finally, the head losses and contribution of above-mentioned terms to the pressure drop was quiteanalyzed.
Mohammad Reza Abrishami,Siamak Sabour,Maryam Nasiri,Reza Amid,Mahdi Kadkhodazadeh 대한구강악안면외과학회 2014 대한구강악안면외과학회지 Vol.40 No.2
Objectives: The present study was conducted to determine the reproducibility of peri-implant tissue assessment using the new implant success index (ISI) in comparison with the Misch classification. Materials and Methods: In this descriptive study, 22 cases of peri-implant soft tissue with different conditions were selected, and color slides were prepared from them. The slides were shown to periodontists, maxillofacial surgeons, prosthodontists and general dentists, and these professionals were asked to score the images according to the Misch classification and ISI. The intra- and inter-observer reproducibility scores of the viewers were assessed and reported using kappa and weighted kappa (WK) tests. Results: Inter-observer reproducibility of the ISI technique between the prosthodontists-periodontists (WK=0.85), prosthodontists-maxillofacial surgeons (WK=0.86) and periodontists-maxillofacial surgeons (WK=0.9) was better than that between general dentists and other specialists. In the two groups of general dentists and maxillofacial surgeons, ISI was more reproducible than the Misch classification system (WK=0.99 versus WK noncalculable, WK=1 and WK=0.86). The intra-observer reproducibility of both methods was equally excellent among periodontists (WK=1). For prosthodontists, the WK was not calculable via any of the methods. Conclusion: The intra-observer reproducibility of both the ISI and Misch classification techniques depends on the specialty and expertise of the clinician. Although ISI has more classes, it also has higher reproducibility than simpler classifications due to its ability to provide more detail.