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Pseudo-in-situ stir casting: a new method for production of aluminum matrix composites with bimodal-sized B_4C reinforcement

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International Journal of Minerals,Metallurgy and Materials 2016年第8期23卷 981-990页

作者： mohammad raei Masoud Panjepour Mahmood Meratian Department of Materials Engineering Isfahan University of Technology

A new method was applied to produce an Al-0.5wt%Ti-0.3wt%Zr/5vol%B_4C composite via stir casting with the aim of characterizing the microstructure of the resulting composite. For the production of the composite, large B4 C particles（larger than 75 μm） with no pre-heating were added to the stirred melt. Reflected-light microscopy, X-ray diffraction, scanning electron microscopy, field-emission scanning electron microscopy, laser particle size analysis, and image analysis using the Clemex software were performed on the cast samples for microstructural analysis and phase detection. The results revealed that as a consequence of thermal shock, B_4 C particle breakage occurred in the melt. The mechanism proposed for this phenomenon is that the exerted thermal shock in combination with the low thermal shock resistance of B_4 C and large size of the added B_4 C particles were the three key parameters responsible for B_4 C particle breakage. This breakage introduced small particles with sizes less than 10 μm and with no contamination on their surfaces into the melt. The mean particle distance measured via image analysis was approximately 60 μm. The coefficient of variation index, which was used as a measure of particle distribution homogeneity, showed some variations, indicating a relatively homogeneous distribution.

关键词： metal matrix composites particle-reinforced composites boron carbide casting thermal shock

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A two-stage DEA model to evaluate sustainability and energy efficiency of tomato production

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Information Processing in Agriculture 2017年第4期4卷 342-350页

作者： Hossein Raheli Rassul mohammad Rezaei Mehri raei Jadidi Hassan Ghasemi Mobtaker Department of Agricultural Economics Faculty of AgricultureUniversity of TabrizTabrizIran Department of Biosystems Engineering Faculty of AgricultureUniversity of TabrizTabrizIran

The aims of this study were to evaluate the sustainability and efficiency of tomato production and to investigate the determinants of inefficiency of tomato farming in Marand region of East Azerbaijan province,*** these purposes,a two-stage methodology was applied,in which for the first time a fractional regression model(FRM)was employed in the second stage of analysis,so that,in the first stage a nonparametric Data Envelopment Analysis(DEA)was used to analyze the efficiencies of tomato production and in the second stage,farm specific variables such as education level,farmers’age,total land size and use of manure were used in a fractional regression model to explain how these factors influenced efficiency of tomato *** results of the first stage showed that there are considerable differences between efficient and inefficient farmers in the studied area,so that the main differences were in the use of chemical fertilizers,biocides and water for ***,the results of second stage revealed that farmers’age,education level and total land size positively affected efficiency in tomato ***,better use of land,chemical fertilizers,water for irrigation and improving the farmers’educational levels through literacy campaign and land consolidation would probably increase the efficiency in the long term.

关键词： Data envelopment analysis Energy efficiency Fractional regression model Tomato

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The Impact of Nitrogen-Fixing Bacteria, Iron, and Zinc Foliar Application on Dry Land Yellow Mustard (Brassica juncea) Grain and Oil Production

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Agricultural Sciences 2024年第7期15卷 719-728页

作者： Saeid Zehtab Salmasi Haleh Nasiri Rezvan Heshmati mohammad Reza Sarikhani Yagoub raei Sustainable Agriculture Science Center Department of Plant and Environmental Sciences New Mexico State University Alcalde New Mexico USA Department of Plant Ecophysiology University of Tabriz Tabriz Iran Department of Soil Science University of Tabriz Tabriz Iran

The study, conducted at the Research Farm of the College of Agriculture, University of Tabriz in 2021, focused on the effects of various nitrogen-fixing bacterial isolates, biofertilizers containing nitrogen and phosphorus, as well as iron and zinc foliar applications on mustard growth under rainfed conditions. The results indicated that biofertilizers, whether used alone or in combination with chemical fertilizers, produced comparable grain and oil outputs compared to chemical fertilizers alone. Additionally, the application of iron and zinc through foliar spraying significantly enhanced both grain and oil production. These findings suggest that integrating nitrogen-fixing bacteria and biofertilizers could reduce reliance on chemical nitrogenous fertilizers, leading to decreased production expenses, improved product quality, and minimized environmental impact. This study highlights the potential for sustainable agricultural practices in dry land farming as a viable alternative to traditional chemical-intensive methods. Substituting chemical nitrogenous fertilizers with nitrogen-fixing bacteria or biofertilizers could result in cost savings in mustard grain and oil production while promoting environmental sustainability.

关键词： Nitrogen Fixing Bacteria Yellow Mustard Dry Land Farming Iron Zinc Foliar Application

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The Impact of Nitrogen-Fixing Bacteria, Iron, and Zinc Foliar Application on Dry Land Yellow Mustard (Brassica juncea ) Grain and Oil Production

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Agricultural Sciences（农业科学） 2024年第7期 719页

作者： Saeid Zehtab Salmasi Haleh Nasiri Rezvan Heshmati mohammad Reza Sarikhani Yagoub raei

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