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Park, K.,Hong, H.Y.,Jung, G.W.,Kim, D.H.,Hakeem, D.A.,Iqbal, A. Elsevier 2018 Ceramics international Vol.44 No.13
<P><B>Abstract</B></P> <P>Fe<SUB>2-<I>x</I> </SUB>Ag<SUB> <I>x</I> </SUB>O<SUB>3</SUB> (0 ≤ <I>x</I> ≤ 0.04) nanopowders with various Ag contents were synthesized at different hydrothermal reaction temperatures (150 °C and 180 °C). Their structural properties were fully investigated through an X-ray diffraction, a Fourier transform infrared spectroscopy, and an X-ray photoelectron spectroscopy. The hydrothermal reaction temperature, time, and Ag content remarkably affected the morphological characteristics and crystal structure of the synthesized powders. The Fe<SUB>2-<I>x</I> </SUB>Ag<SUB> <I>x</I> </SUB>O<SUB>3</SUB> (0 ≤ <I>x</I> ≤ 0.04) powders synthesized at 150 °C for 6 h and the Fe<SUB>2-<I>x</I> </SUB>Ag<SUB> <I>x</I> </SUB>O<SUB>3</SUB> (0.02 ≤ <I>x</I> ≤ 0.04) powders synthesized at 180 °C for 12 h formed the orthorhombic α-FeOOH phase with a rod-like morphology, whereas the Fe<SUB>2-<I>x</I> </SUB>Ag<SUB> <I>x</I> </SUB>O<SUB>3</SUB> (0 ≤ <I>x</I> ≤ 0.01) powders synthesized at 180 °C for 12 h formed the rhombohedral α-Fe<SUB>2</SUB>O<SUB>3</SUB> phase with a spherical-like morphology. The Fe<SUB>1.98</SUB>Ag<SUB>0.02</SUB>O<SUB>3</SUB> fabricated by utilizing Fe<SUB>1.98</SUB>Ag<SUB>0.02</SUB>O<SUB>3</SUB> powders synthesized at 180 °C showed the largest power factor (0.64 ×10<SUP>−5</SUP> Wm<SUP>−1</SUP> K<SUP>−2</SUP>) and dimensionless figure-of-merit (0.0036) at 800 °C.</P>
K. Iqbal,Parvaiz A. Khand 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.58 No.3
We have studied the kinetics of an irreversible dimer-trimer reaction of the type 2 A_3 + 3 B_2 ! 6 AB by considering the precursor motion of the dimer (B_2) on a square, as well as on a hexagonal surface, by using a Monte Carlo simulation. When the movement of precursors is limited to the first nearest neighborhood, the model gives reactive window widths of the order of 0.22 and 0.29 for the square and the hexagonal lattices, respectively, which are quite large compared to those predicted by the Langmuir-Hinshelwood (LH) model. The phase diagrams resemble qualitatively to those of standard Ziff, Gulari and Barshad (ZGB) model. The width of the reactive window of the precursor model depends upon the mobility of the precursors. The continuous transition disappears when the motion of precursors is extended to the third nearest neighborhood. The diffusion of B atoms to adjacent vacant sites, as well as desorption of the dimer (B_2) from the surface with a certain probability (P), is also considered.
Surface Texturing for Low Friction Mechanical Components
Iqbal, K. Y. Mohd,Segu, D. Z.,Pyung, H.,Kim, J. H.,Kim, S. S. Korean Tribology Society 2015 한국윤활학회지(윤활학회지) Vol.4 No.1
Laser surface texturing (LST), a surface engineering modification, has been considered as one of the new processes used to improve tribological characteristics of materials by creating artificially patterned microstructure on the contact surface of mechanical components. In LST technology, the laser is optimized to obtain or manufacture the dimples with maximum precision. The micro-dimples reduce the coefficients of friction and also improve the wear resistance of materials. This study investigates the effect of dimple density is investigated. For this purpose, a ball-on-disc type tester is used with AISI 52100 bearing steel as the test material. Discs are textured with a 5% and 10% dimple density. Experimental work is performed with normal loads of 5 N, 10 N, and 15 N under a fixed speed of 150 rpm at room temperature. The effect of the textured surface is compared to that of the untextured one. Experimental results show that the textured surface yields lower friction coefficients compared to those of untextured surfaces. Specifically, the 10% dimple density textured surface shows better friction reduction behavior than the 5% dimple density textured sample, and has an 18% improvement in friction reduction compared with the untextured samples. Microscopic observation using a scanning electron microscope (SEM) shows that the major friction mechanisms of the AISI 52100 bearing steel are adhesion, plastic deformation, and ploughing.
Surface Texturing for Low Friction Mechanical Components
K. Y. Mohd Iqbal,D. Z. Segu,H. Pyung,J. H. Kim,S. S. Kim 한국트라이볼로지학회 2015 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.31 No.6
Laser surface texturing (LST), a surface engineering modification, has been considered as one of the new processes used to improve tribological characteristics of materials by creating artificially patterned microstructure on the contact surface of mechanical components. In LST technology, the laser is optimized to obtain or manufacture the dimples with maximum precision. The micro-dimples reduce the coefficients of friction and also improve the wear resistance of materials. This study investigates the effect of dimple density is investigated. For this purpose, a ball-on-disc type tester is used with AISI 52100 bearing steel as the test material. Discs are textured with a 5% and 10% dimple density. Experimental work is performed with normal loads of 5 N, 10 N, and 15 N under a fixed speed of 150 rpm at room temperature. The effect of the textured surface is compared to that of the untextured one. Experimental results show that the textured surface yields lower friction coefficients compared to those of untextured surfaces. Specifically, the 10% dimple density textured surface shows better friction reduction behavior than the 5% dimple density textured sample, and has an 18% improvement in friction reduction compared with the untextured samples. Microscopic observation using a scanning electron microscope (SEM) shows that the major friction mechanisms of the AISI 52100 bearing steel are adhesion, plastic deformation, and ploughing.
Hyeong, K.E.,Iqbal, A.,Kim, Jong-Joo Asian Australasian Association of Animal Productio 2014 Animal Bioscience Vol.27 No.10
Age at first calving is an important trait for achieving earlier reproductive performance. To detect quantitative trait loci (QTL) for reproductive traits, a genome wide association study was conducted on the 96 Hanwoo cows that were born between 2008 and 2010 from 13 sires in a local farm (Juk-Am Hanwoo farm, Suncheon, Korea) and genotyped with the Illumina 50K bovine single nucleotide polymorphism (SNP) chips. Phenotypes were regressed on additive and dominance effects for each SNP using a simple linear regression model after the effects of birth-year-month and polygenes were considered. A forward regression procedure was applied to determine the best set of SNPs for age at first calving. A total of 15 QTL were detected at the comparison-wise 0.001 level. Two QTL with strong statistical evidence were found at 128.9 Mb and 111.1 Mb on bovine chromosomes (BTA) 2 and 7, respectively, each of which accounted for 22% of the phenotypic variance. Also, five significant SNPs were detected on BTAs 10, 16, 20, 26, and 29. Multiple QTL were found on BTAs 1, 2, 7, and 14. The significant QTLs may be applied via marker assisted selection to increase rate of genetic gain for the trait, after validation tests in other Hanwoo cow populations.
FURTHER ON PETROVIĆ'S TYPES INEQUALITIES
IQBAL, WASIM,REHMAN, ATIQ UR,FARID, GHULAM,RATHOUR, LAXMI,SHARMA, M.K.,MISHRA, VISHNU NARAYAN The Korean Society for Computational and Applied M 2022 Journal of applied mathematics & informatics Vol.40 No.5-6
In this article, authors derived Petrović's type inequalities for a class of functions, namely, called exponentially h-convex functions. Also, the associated results for coordinates has been derived by defining exponentially h-convex functions on coordinates.
Optimization of a laser plasma x-ray source for ultrafast x-ray absorption spectroscopy
Iqbal, M.,Ijaz, M.,Noh, D. Y.,Janulewicz, K. A.,Stiel, H.,Nickles, P. V. 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol. No.
<P>We present optimization of laser plasma x-ray experimental conditions for ultrafast x-ray absorption spectroscopy measurements on broad range of transition metal oxides. First, the x-ray flux generated from a laser plasma source was optimized with an emphasis on the Bremsstrahlung by investigating the influence of the angle of the incidence of laser beam on a Cu tape target. The x-ray flux emitted in both the front and transmitted side of the target was found to be optimal at the incident angle of 15 similar to 25 degrees. Moreover the manipulation of the Bremsstrahlung peak energy by the laser focus distribution was discussed. In addition to the source optimization, we present a scheme to find the time-delay zero position in a pump-probe experiment together with a normalization scheme for x-ray source fluctuations. As a feasibility check, we present the transmitted spectra of two materials, Ni and NiO.</P>
Iqbal, M.A.,Kim, K.H. Elsevier Scientific Pub. Co 2016 Trends in analytical chemistry Vol.76 No.-
<P>Charcoal is widely used today for both indoor and outdoor cooking activities such as household cooking, grilling, barbecuing, and broiling. As such, its combustion has been designated as sources of a diverse range of pollutants containing particulate matter (PM) and a list of hazardous trace metals (TMs) in both indoor/outdoor ambient air. In this work, we review the current status of technical tools and approaches to measure the pollution of PM and TMs emitted due to charcoal combustion with respect to available sampling, pretreatment, and analytical techniques. The reported concentration levels of those pollutants were compared in reference to guideline values. Finally, the potential health hazards of PMs and TMs emitted from charcoal are evaluated. Based on this approach, a concise view is provided to describe the diversity, level, and health hazards of particulate and metallic pollutants emitted through the combustion of charcoal in cooking activities. (C) 2015 Elsevier B.V. All rights reserved.</P>