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- 저자 : Hafiz Muhammad Rizwan (검색결과 2 건)
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Synthesis and mechanical characterization of alumina based composite material for armor application
Muhammad Shahid,Rizwan Ahmed Malik,Hussein Alrobei,Jaehwan Kim,Muhammad Latif,Azhar Hussaina,Muhammad Uzair Iqbal,Azeem Hafiz 한양대학교 세라믹연구소 2021 Journal of Ceramic Processing Research Vol.22 No.2
This study focuses on development of advance ceramic with improved toughness which can be used as armor material forpersonnel protection. Toughness is the characteristics that defines material resistance to fracture. Ceramics are important classof materials with combination of good strength, toughness and with stand multiple-striking. In this study, three differentsamples i.e. alumina, Zirconia toughened alumina (ZTA), and alumina incorporated with SiC (SiCA); hexagonal shapesamples were made by dry pressing and sintered at 1600 oC in argon atmosphere. Microstructural characterization: SEM andOptical microscopy demonstrated fine grain size distribution in matrix phase. BSE images confirmed the presence of ZrO2particles. High porosity of about 6.35% was observed in SiCA samples. EDX analysis confirms the composition. Mechanicalcharacterization showed improved toughness at the expense of hardness. SiCA samples showed maximum value of hardnesswhile ZTA showed maximum toughness of 4.6 MPa·m1/2. The obtained properties are comparable to other ceramic materialsprepared by different methods.
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Muhammad Irshad,Bizhu He,Shuang Liu,Sangeeta Mitra,Biswojit Debnath,Min Li,Hafiz Muhammad Rizwan,Dongliang Qiu 한국원예학회 2017 Horticulture, Environment, and Biotechnology Vol.58 No.5
Okra (Abelmoschus esculentus L.) belongs to the Malvaceae family and is a difficult species to manipulateand regenerate in vitro. In this study, factors that influence secretion of phenolic compounds, callus induction, andsubsequent regeneration in okra were optimized. Different concentrations of anti-browning additives, such as activatedcharcoal (AC) and citric acid (CA) were tested alone or in combination with ascorbic acid (AA) in MS medium toevaluate their ability to control phenolic secretion from hypocotyl and cotyledon explants. Among the anti-browningadditives, 200 mg・L-1AC and 10 mg・L-1CA +AA (1:1) were best at controlling phenolic secretion from hypocotyland cotyledon explants in callus induction medium. Hypocotyl explants were more suitable for callus initiation andorganogenesis than cotyledon explants. Moreover, among twelve types of media tested for callus culture, the additionof 0.5 mg・L-12,4-dicholorophenoxy acetic acid (2,4-D) and 1.5 mg・L-1benzyladenine (BA) to the growth media wasthe most effective for hypocotyl explants, whereas MS + 1.5 mg・L-1α-naphthylacetic acid (NAA) and 0.5 mg・L-16-benzyloaminopurine (BAP) was effective for cotyledon explants. Improved shoot regeneration was achieved with 2mg・L-1BAP and 0.1 mg・L-1indole butyric acid (IBA). The maximum number of strong and healthy roots wasobtained on media that included 2 mg・L-1IBA and 200 mg・L-1AC. Rooted plantlets were successfully acclimatizedin earthen pots, and the rooted plantlets had normal morphology and growth characteristics. The present study offersa potential solution for controlling phenolic secretion during okra regeneration using additives and evaluates themanipulation of plant growth regulators for effective regeneration of the Wufu okra cultivar.
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