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RISS 인기검색어
- 검색키워드
- 저자 : Masoud Latifi (검색결과 5 건)
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Farnaz Memarian,Masoud Latifi,Mohammad Amani-Tehran 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
The different aspects of fabricating continuous TiO2 nanofiber yarns using oppositely charged metallic nozzles are studied. The importance of a proper auxiliary polymer, solvent and process required for continuous yarn formation are considered as effective process factors and are studied. Practical studies on solution concentration of the proposed polymer and solvent showed that it plays a significant role in the continuous electrospinning of nanofiber yarns and the diameter of nanofibers contained in the yarns.
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Mohammad Bagher Nasiri,Masoud Behzadinejad,Hamidreza Latifi,Jukka Martikainen 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.8
Arc efficiency of Gas Tungsten Arc Welding (GTAW) was determined by calorimetric method. A water-cooled anode calorimeterwas designed and manufactured to measure the arc thermal efficiency, which was determined as a function of current, arc length, polarityand gas flow rate for GTAW of mild steel. With Direct Current Electrode Negative (DCEN) polarity and 5 mm arc length, a thermalefficiency of 67±4% was obtained, which was independent of the welding current. With Direct Current Electrode Positive (DCEP) polarityand 5 mm arc length, arc thermal efficiency was determined as 52±4%. The experimental data show that the arc efficiency decreasesfrom 67% to 58% and 51% as the arc length increases from 5 mm to 11 and 17.5 mm, respectively. The experimental results also showthat the arc efficiency is not significantly affected by the shielding gas flow rate.
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Sheyda Sadat Mirjalali Bandari,Azita Asayesh,Masoud Latifi 한국섬유공학회 2020 Fibers and polymers Vol.21 No.4
Stress relaxation is a time-dependent behavior in textiles, which occurs with the release of stresses when the textileis under constant strain over a period of time. This phenomenon will induce disturbances in textile performance inapplications such as pressure garments, varicose stockings, pressure bandages and etc., in which it is critical to maintainpressure on the scar area, within a certain range according to instructions from doctors or therapists. Consequently, bytheoretical and experimental research on the factors affecting stress relaxation, it will be possible to design and produceappropriate functional clothes. In the present study, double jersey weft knitted fabrics with five different knit patternsdiffering in the number of back bed tuck stitches have been produced and the effect of fabric structure and strain value on thestress relaxation of the fabrics in the course direction have been investigated. The results reveal that by increasing the numberof tuck stitches in the fabric structure, the initial and residual stress values decrease whilst the stress relaxation of the fabricincreases. Moreover, in all fabric structures, applying higher tensile strain will cause higher stress in the fabrics as well asincrease the stress relaxation of the fabrics. Eventually, three components Maxwell model with parallel connected nonlinearspring proposed as the best model that matches the experimental results. As a whole, to enhance the functionality of pressuregarments, varicose stockings and compression bandages, the use of tuck stitch in the fabric structure is not recommended.
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TiO2 nanofiber yarns: A prospective candidate as a photocatalyst
Farnaz Memarian,Mohammad Amani-Tehran,Masoud Latifi 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.23 No.-
Considering the efficient TiO2 structure on enhancing its photocatalytic behavior is of great interest in recent years. Meanwhile, inhibiting the filtration process for detachment of the catalyst from the purified solution is very advantages. To approach this purpose, TiO2 nanofiber yarns were successfully fabricated through the electrospinning technique using two oppositely charged nozzles followed by the calcinations process from a solution containing titanium precursor and polyvinyl acetate (PVAc) as the supporting material. The introduced nanofiber yarns eliminate the ultrasonic and centrifuge steps required in photocatalytic tests of nanoparticles and electrospun nanofibers. The results show that this new catalyst’s structure maintains its shape during the photocatalytic degradation process and can be easily removed from the purified water.
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Ali Safavi,Mohsen Gorji,Roohollah Bagherzadeh,SAEEDEH MAZINANI,Masoud Latifi 한국섬유공학회 2023 Fibers and polymers Vol.24 No.11
In this research, the thermoregulation behavior of layered arrangement of fabric containing microencapsulated phase change materials (mPCMs) is mathematically modeled based on a previously developed theoretical model of monolayer fabric—mPCMs. This work considers a thermal range for mPCMs instead of just a melting point. The skin temperature is calculated for a simulated situation when a person moves from 35 to 0 °C atmosphere. The results show that the location of layers containing mPCMs has the primary effect on skin temperature. This study defines the effectiveness intensity index (EII) and effectiveness time index (ETI) to describe the dynamic thermal behavior of fabric settings. The proposed model, which is also validated by experimental results, can be used to estimate the thermal behavior of clothing systems containing mPCMs and design protective clothing systems with proper dynamic thermal insulation for different climates. This study presents the model that can be useful for design the garment layers containing mPCMs. Due to considering the melting range instead of just melting point for mPCMs, it seems that this simple model can predict the thermal behavior of garments close to real condition.
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