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1
Content available Effect of Vortex Runner Gating System on the Mechanical Strength of Al-12Si Alloy Castings
100%
Hashim M. , Ahmad R.
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2
Content available remote Parametric optimization of NiFe2O4 nanoparticles synthesized by mechanical alloying
88%
Hajalilou A. , Hashim M. , Ebrahimi-Kahrizsangi R. , Kamari H. M. , Kanagesan S.
Materials Science Poland
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2014
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tom Vol. 32, No. 2
281--291
EN
In this study, the Taguchi robust design method is used for optimizing ball milling parameters including milling time, rotation speed and ball to powder weight ratio in the planetary ball milling of nanostructured nickel ferrite powder. In fact, the current work deals with NiFe2O4 nanoparticles mechanochemically synthesized from NiO and Fe2O3 powders. The Taguchi robust design technique of system optimization with the L9 orthogonal array is performed to verify the best experimental levels and contribution percentages (% r) of each parameter. Particle size measurement using SEM gives the average particle size value in the range of 59 – 67 nm. X-ray diffraction using Cu Ka radiation is also carried out to identify the formation of NiFe2O4 single phase. The XRD results suggest that NiFe2O4 with a crystallite size of about 12 nm is present in 30 h activated specimens. Furthermore, based on the results of the Taguchi approach the greatest effect on particle size (42.10 %) is found to be due to rotation speed followed by milling time (37.08 %) while ball to powder weight ratio exhibits the least influence.
3
Content available The Site Preference Analysis and Ordering Characteristics of Ternary Cu0.5(Zn1–xMx)0.5 (M = Transition Metals) Alloys
76%
Ahmad N. , Ziya A. B. , Atiq S. , Saifullah K. , Hashim M. , Saleem M.
Archives of Metallurgy and Materials
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2018
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tom Vol. 63, iss. 3
1531--1535
EN
The site preference of some transition metals during B2-type ordering has been investigated in the ternary Cu0.5 (Zn1-x Mx )0.5 alloys with M = Ti, V, Ag, Au, Cr, Mn, Fe, Co, Ni, Nb, Mo, Hf, Ta, W, Re or Pt (x ≤ 0.01). The statistic-o-thermodynamical theory combined with the electronic theory of alloys has been used to calculate the partial ordering energies, partial short range order parameters and the order-disorder transformation temperatures. The values of partial short range order parameters have been used to determine the site preference of the metal M. The analysis shows that the metals M can be divided into two groups with regard to lattice site occupancy. One group comprising of Cr, Mn, Fe, Co, Ni, Nb, Mo, Hf, Ta, W, Re or Pt was found to prefer Zn sublattice sites, while the second group of Ti, V, Ag or Au atoms prefer Cu sublattice sites. It is found that order-disorder transformation temperature and the site preference of metal M both depend strongly on the partial ordering energies and ternary alloying addition of metal M.
4
Content available The Site Preference Analysis and Ordering Characteristics of Ternary Cu0.5(Zn1–xMx)0.5 (M = Transition Metals) Alloys
76%
Ahmad N. , Ziya A. B. , Atiq S. , Saifullah K. , Hashim M. , Saleem M.
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nr 3
5
New record of Bembradium magnoculum (Actinopterygii: Scorpaeniformes: Plectrogeniidae) from the north-eastern Indian Ocean
63%
Aneesh Kumar K. V. , Sileesh M. , Rajeeshkumar M. , Bineesh K. , Hashim M. , Saravanane N. , Sudhakar M. , Fricke R.
Acta Ichthyologica et Piscatoria
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2019
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tom 49
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nr 3
6
Biohydrogen production by Antarctic psychrotolerant Klebsiella sp. ABZ11
51%
Mohammed A. , Abdul-Wahab M. F. , Hashim M. , Omar A. H. , MD Reba M. N. , Said M. F. M. , Soeed K. , Alias S. A. , Smykla J. , Abba M. , Ibrahim Z.
Polish Journal of Microbiology
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2018
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tom 67
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nr 3
EN
Lower temperature biohydrogen production has always been attractive, due to the lower energy requirements. However, the slow metabolic rate of psychrotolerant biohydrogen-producing bacteria is a common problem that affects their biohydrogen yield. This study reports on the improved substrate synthesis and biohydrogen productivity by the psychrotolerant Klebsiella sp. strain ABZ11, isolated from Antarctic seawater sample. The isolate was screened for biohydrogen production at 30°C, under facultative anaerobic condition. The isolate is able to ferment glucose, fructose and sucrose with biohydrogen production rate and yield of 0.8 mol/l/h and 3.8 mol/g, respectively at 10 g/l glucose concentration. It also showed 74% carbohydrate uptake and 95% oxygen uptake ability, and a wide growth temperature range with optimum at 37°C. Klebsiella sp. ABZ11 has a short biohydrogen production lag phase, fast substrate uptake and is able to tolerate the presence of oxygen in the culture medium. Thus, the isolate has a potential to be used for lower temperature biohydrogen production process.
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