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      • Nonlinear dynamic characteristic of sandwich graphene platelet reinforced plates with square honeycomb core

        Mamoon A.A. Al-Jaafari,Ridha A. Ahmed,Raad M. Fenjan,Nadhim M. Faleh 국제구조공학회 2023 Steel and Composite Structures, An International J Vol.46 No.5

        Nonlinear forced vibration behaviors of sandwich plates having graphene platelets (GPL) based face sheets have been researched in this article. Possessing low weight together with low stiffness, square honeycomb cores are mostly constructed by aluminum. Herein, the square shaped core has been fortified by two skins of GPL-based type in such a way that the skins have uniform and linearly graded GPL dispersions. The square shaped core has the effective material specification according to the relative density concept. The whole formulation has been represented based upon classical plate theory (CPT) while harmonic balance approach is applied for solving the problem and plotting the amplitude-frequency curves. The forced vibration behaviors of such plates are influenced by square-shaped core and the relative density, skin’s height and GPL fortification.

      • Genome-wide analysis of Family-1 UDP-glycosyltransferases in soybean confirms their abundance and varied expression during seed development

        Mamoon Rehman, H.,Amjad Nawaz, M.,Bao, L.,Hussain Shah, Z.,Lee, J.M.,Ahmad, M.Q.,Chung, G.,Yang, S.H. G. Fischer 2016 Journal of plant physiology Vol.206 No.-

        <P>Family-1 UDP-glycosyltransferases (EC 2.4.1.x; UGTs) are enzymes that glycosylate aglycones into glycoside-associated compounds with improved transport and water solubility. This glycosylation mechanism is vital to plant functions, such as regulation of hormonal homeostasis, growth and development, xenobiotic detoxification, stress response, and biosynthesis of secondary metabolites. Here, we report a genome-wide analysis of soybean that identified 149 putative UGTs based on 44 conserved plant secondary product glycosyl-transferase (PSPG) motif amino acid sequences. Phylogenetic analysis against 22 referenced UGTs from Arabidopsis and maize clustered the putative UGTs into 15 major groups (A-O); J, K, and N were not represented, but the UGTs were distributed across all chromosomes except chromosome 04. Leucine was the most abundant amino acid across all 149 UGT peptide sequences. Two conserved introns (C-1 and C-2) were detected in the most intron-containing UGTs. Publicly available microarray data on their maximum expression in the seed developmental stage were further confirmed using Affymetrix soybean IVT array and RNA sequencing data. The UGT expression models were designed, based on reads per kilobase of gene model per million mapped read (RPKM) values confirmed their maximally varied expression at globular and early maturation stages of seed development. (C) 2016 Elsevier GmbH. All rights reserved.</P>

      • On dynamic deflection analysis of sandwich beams under thermal and pulse loads

        Mamoon A.A. Al-Jaafari,Haider Ali Hussein,Abdulaziz Saud Khider,Raad M. Fenjan,Nadhim M. Faleh 국제구조공학회 2023 Steel and Composite Structures, An International J Vol.46 No.2

        Dynamic deflection analysis of sandwich beams with cellular core under thermal and pulse loads has been performed in the present article. The cellular core sandwich beam has two layers fortified by graphene oxide powder (GOP) which are micromechanically modeled by Halpin-Tsai formulation. The pulse load has blast type and is applied on the top side of sandwich beam. The system of equations has been developed based on higher-order beam theory and Ritz method. Then, they are solved in Laplace domain to derive the dynamic deflections. The dependency of beam deflection on temperature variation, GOP content, pulse load duration/location and core relative density has been studied in detail.

      • SCOPUSKCI등재

        GROUP GRADED TYPES OF BÉZOUT MODULES

        Ahmed, Mamoon,Moh'D, Fida Korean Mathematical Society 2017 대한수학회논문집 Vol.32 No.3

        In this paper, we introduce two group graded types of $B{\acute{e}}zout$ modules, namely graded-$B{\acute{e}}zout$ modules and weakly graded-$B{\acute{e}}zout$ modules, which are two $B{\acute{e}}zout$ versions in Graded Module Theory. We investigate the relationship among the three types of $B{\acute{e}}zout$ modules, the ordinary $B{\acute{e}}zout$ modules and the two graded types of $B{\acute{e}}zout$ modules. Also, we study the structure of these new $B{\acute{e}}zout$ modules along with different properties; for instance, "A graded-$B{\acute{e}}zout$ R-module, with R being a Noetherian ring, is Noetherien iff it is gr-Noetherian".

      • Functional characterization of naturally occurring wild soybean mutant (<i>sg-5</i>) lacking astringent saponins using whole genome sequencing approach

        Rehman, Hafiz Mamoon,Nawaz, Muhammad Amjad,Shah, Zahid Hussain,Yang, Seung Hwan,Chung, Gyuhwa Elsevier 2018 Plant science Vol.267 No.-

        <P><B>Abstract</B></P> <P>Triterpenoid saponins are one of the most highly accumulated groups of functional components in soybean (<I>Glycine max</I>) and the oxidative reactions during their biosynthesis are required for their aglycone diversity. Natural mutants of soyasaponins in wild soybean (<I>Glycine soja</I>) are valuable resources for establishing the soyasaponin biosynthesis pathway and breeding new soybean varieties. In this study, we investigated the genetic mechanism behind the absence of group A saponins in a Korean wild soybean mutant, CWS5095. Whole genome sequencing (WGS) of CWS5095 identified four point mutations [Val6 → Asp, Ile231 → Thr, His294 → Gln, and Arg376 → Lys] in <I>CYP72A69</I> (<I>Glyma15g39090</I>), which oxygenate the C-21 position of soyasapogenol B or other intermediates to produce soyasapogenol A, leading to group A saponin production. An <I>in vitro</I> enzyme activity assay of single-sited mutated clones indicated that the Arg376 > Lys mutation (a highly conserved mutation based on a nucleotide change from G → A at the 1,127th position) may lead to loss of gene function in the <I>sg-5</I> mutant. A very high normalized expression value of 377 reads per kilo base per million (RPKM) of <I>Glyma15g39090</I> in the hypocotyl axis at the early maturation seed-development stage confirmed their abundant presence in seed hypocotyls. A molecular dynamics analysis of the Arg376 > Lys mutation based on the <I>CYP3A4</I> (a human CYP450) protein structure found that it was responsible for the increase in axis length toward the heme (active site), which is critically important for biological activity and ligand binding. Our results provide important information on how to eradicate bitter and astringent saponins in soybean by utilizing the reported mutation in <I>Glyma15g39090</I>, and its importance for seed hypocotyl development based on transcript abundance.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The reported <I>sg</I>-5 mutant provides a unique genetic resource to eradicate group A saponins, which are bitter and astringent in taste. </LI> <LI> <I>CYP72A69</I> gene, oxygenate the C-21 position of soyasapogenol B to produce soyasapogenol A. </LI> <LI> Arg376 > Lys mutation in a <I>CYP72A69</I> gene in soybean may lead to loss of gene function in the <I>sg</I>-5 mutant. </LI> <LI> Arg376 > Lys mutation based on the <I>CYP3A4</I> (a human CYP450) protein structure change the axis length toward the heme (active site). </LI> </UL> </P>

      • KCI등재

        Techno-Economic Analysis of Grid-Connected Hybrid Renewable Energy System for Remote Areas Electrification Using Homer Pro

        Ur Rashid Mamoon,Ullah Irshad,Mehran Muhammad,Baharom M. N. R.,Khan Faisal 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.2

        Pakistan is facing a drastic scarcity of electricity for the last two decades. Most of the areas in Pakistan have no access to electricity especially in Balochistan where most of the population has no electricity and water supply. Concerning the electricity issues, this research study is investigated to design a technical and economical hybrid system for the remote areas of Balochistan. For this purpose, three remote sites have been selected named Gujar village in district Awaran, Plantak in Washuk, and Shahrak village in Kech of Balochistan. Proposed sites are analyzed to fi nd the potential of renewable energy i.e. Wind and solar in the targeted sites of Balochistan. The wind and solar potential data are taken from the PMD, NREL, and NASA websites. For the selected sites, three models have been designed in Homer Pro software by using diff erent component combinations. These components include a fuel cell, generator, batteries, hydrogen tank, electrolyzer, Wind and Solar modules, and Converters. These models are connected to the grid to sell back the excess energy to the grid through net metering. After simulation and optimization, the most feasible and economic solution is decided that is based on NPC, COE, initial cost, and operating cost.

      • KCI등재

        Highly Reflective Distributed Bragg Reflectors for Planar Microcavities: From Modelling to Experimentation

        Zeeshan Tahir,Mamoon Ur Rashid,김성도,박윤창,Hong Nhan Tran,조신욱,김용수 한국전기전자재료학회 2024 Transactions on Electrical and Electronic Material Vol.25 No.1

        Highly reflective distributed Bragg reflectors (DBRs) play significant in controlling and manipulating the spontaneous emission of light in photonic and optoelectronic devices. Herein, we report a systemic study based on the complete theoretical modeling and the fabrication of highly reflective DBR comprised of 7.5 periods of repeating TiO2/SiO2 thin films. Firstly, a computational model based on the transfer matrix method was used to simulate the reflectance, transmittance, and electric field intensity distribution across the DBR structure. Subsequently, fabrication was performed via the conventional electron beam evaporation technique. Interestingly, the as-grown DBR exhibits low surface roughness ~0.767 nm and sharp interfaces between the neighboring TiO2 and SiO2 films manifesting the high quality of the fabrication process. Consequently, an excellent consistency was observed between the simulated and the experimental reflectance and transmittance spectra confirming the successful growth of the 7.5 pairs DBR. Moreover, the high reflectance ~99.0% reflectance and the large stopband width ~190 nm in the range 600–800 nm indicates the superior performance of the as-fabricated DBRs and were therefore utilized to develop a highly reflective monolithic and a Tamm plasmon planar microcavities.

      • Prognostic Sub-Grouping of Diffuse Large B-Cell Lymphomas into Germinal Centre And Post Germinal Centre Groups by Immunohistochemistry after 6 Cycles of Chemotherapy

        Hassan, Usman,Mushtaq, Sajid,Mamoon, Nadira,Asghar, Asghar Hussain,Ishtiaq, Sheeba Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.4

        Introduction: Diffuse large B-cell lymphomas (DLBCL) can be divided into germinal centre (GC-DLBCL) and post germinal centre (post GC-DLBCL) groups by applying immunohistochemical antibodies. As these subgroups respond differently to chemotherapy, it is possible at diagnosis to select a poor prognostic subgroup for aggressive treatment. Objective: To determine the frequencies of GC-DLBCL and post GC-DLBCL in patients by immunohistochemistry (IHC) and the clinical response after six cycles of chemotherapy. Subjects and Methods: In this descriptive study conducted in AFIP and CMH, Rawalpindi and NORI, Islamabad, from September 2010 to September 2011, a total of 75 pretreatment cases of DLBCL diagnosed during the study period were included. Cases were segregated in to GC-DLBCL and post GC-DLBCL groups according to results of immunohistochemistry markers CD10, BCL6 and MUM1. Immediate clinical response was assessed after 6 cycles of chemotherapy. Response was divided into complete response, partial response, stable disease or relapse or progression. Results: The mean age was $54.2{\pm}15$. Males were 53 (70.7%). Forty (53.3%) cases comprised the GC-DLBCL group; 25(62.5%) of them showed a complete response. Most patients of the post GC-DLBCL 19(54%) showed relapse/progression. Results of immediate clinical response in both prognostic subgroups were significant (p<0.05). Results regarding positivity with immunohistochemical antibodies CD10 (p 0.011), BCL6 (p 0.013) and MUM1 (p 0.000) regarding immediate clinical response were also significant. Conclusion: GC-DLBCL group shows better response to CHOP chemotherapy regimen. Immunohistochemistry should be used to further classify DLBCL as this can enable us to select aggressive group for aggressive treatment. This manuscript is important because the study is the first to becarried out exclusively in Pakistan or our part of the world.

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