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A multiwavelength analysis of a collection of short-duration GRBs observed between 2012 and 2015
Pandey, S B,Hu, Y,Castro-Tirado, Ao J,Pozanenko, A S,Sá,nchez-Ramí,rez, R,Gorosabel, J,Guziy, S,Jelinek, M,Tello, J C,Jeong, S,Oates, S R,Zhang, B-B,Mazaeva, E D,Volnova, A A,Minaev, P Yu Oxford University Press 2019 MONTHLY NOTICES- ROYAL ASTRONOMICAL SOCIETY Vol.485 No.4
<B>Abstract</B><P>We investigate the prompt emission and the afterglow properties of short-duration gamma-ray burst (sGRB) 130603B and another eight sGRB events during 2012-2015, observed by several multiwavelength facilities including the Gran Canarias Telescope 10.4 m telescope. Prompt emission high energy data of the events were obtained by INTEGRAL-SPI-ACS, Swift-BAT, and Fermi-GBM satellites. The prompt emission data by INTEGRAL in the energy range of 0.1-10 MeV for sGRB 130603B, sGRB 140606A, sGRB 140930B, sGRB 141212A, and sGRB 151228A do not show any signature of the extended emission or precursor activity and their spectral and temporal properties are similar to those seen in case of other short bursts. For sGRB 130603B, our new afterglow photometric data constrain the pre-jet-break temporal decay due to denser temporal coverage. For sGRB 130603B, the afterglow light curve, containing both our new and previously published photometric data is broadly consistent with the ISM afterglow model. Modeling of the host galaxies of sGRB 130603B and sGRB 141212A using the LePHARE software supports a scenario in which the environment of the burst is undergoing moderate star formation activity. From the inclusion of our late-time data for eight other sGRBs we are able to: place tight constraints on the non-detection of the afterglow, host galaxy, or any underlying ‘kilonova’ emission. Our late-time afterglow observations of the sGRB 170817A/GW170817 are also discussed and compared with the sub-set of sGRBs.</P>
Probabilistic assessment on buckling behavior of sandwich panel: - A radial basis function approach
R.R. Kumar,K.M. Pandey,S. Dey 국제구조공학회 2019 Structural Engineering and Mechanics, An Int'l Jou Vol.71 No.2
Probabilistic buckling behavior of sandwich panel considering random system parameters using a radial basis function(RBF) approach is presented in this paper. The random system properties result in an uncertain response of the sandwich structure. The buckling load of laminated sandwich panel is obtained by employing higher-order-zigzag theory (HOZT) coupled with RBFand probabilistic finite element (FE) model. The in-plane displacement variation of core as well as facesheet is considered to becubic while transverse displacement is considered to be quadratic within the core and constant in the facesheets. Individual andcombined stochasticity in all elemental input parameters (like facesheets thickness, ply-orientation angle, core thickness andproperties of material) are considered to know the effect of different degree of stochasticity, ply- orientation angle, boundaryconditions, core thickness, number of laminates, and material properties on global response of the structure. In order to achieve thecomputational efficiency, RBF model is employed as a surrogate to the original finite element model. The stiffness matrix of globalresponse is stored in a single array using skyline technique and simultaneous iteration technique is used to solve the stochasticbuckling equations.
Pandey, R.P.,Parajuli, P.,Koffas, M.A.G.,Sohng, J.K. Pergamon Press ; Elsevier Science Ltd 2016 BIOTECHNOLOGY ADVANCES Vol.34 No.5
<P>In this review, we address recent advances made in pathway engineering, directed evolution, and systems/synthetic biology approaches employed in the production and modification of flavonoids from microbial cells. The review is divided into two major parts. In the first, various metabolic engineering and system/synthetic biology approaches used for production of flavonoids and derivatives are discussed broadly. All the manipulations/engineering accomplished on the microorganisms since 2000 are described in detail along with the biosynthetic pathway enzymes, their sources, structures of the compounds, and yield of each product. In the second part of the review, post-modifications of flavonoids by four major reactions, namely glycosylations, methylations, hydroxylations and prenylations using recombinant strains are described. (C) 2016 Elsevier Inc. All rights reserved.</P>
Pandey, R.P.,Parajuli, P.,Gurung, R.B.,Sohng, J.K. IPC Science and Technology Press ; Elsevier Scienc 2016 Enzyme and microbial technology Vol.91 No.-
<P>Escherichia coli BL21 (DE3) was engineered by blocking glucose-1-phosphate utilizing glucose phosphate isomerase (pgi), glucose-6-phosphate dehydrogenase (zwf) and uridylyltransferase (galU) genes to produce pool of four different rare dTDP-sugars. The cytosolic pool of dTDP-L-rhamnose, dTDP-D-viosamine, dTDP-4-amino 4,6-dideoxy-D-galactose, and dTDP-3-amino 3,6-dideoxy-D-galactose was generated by overexpressing respective dTDP-sugars biosynthesis genes from various microbial sources. A flexible glycosyltransferase YjiC, from Bacillus licheniformis DSM 13 was also overexpressed to transfer sugar moieties to 3-hydroxyl group of 3-hydroxyflavone, a core unit of flavonoids. Among four rare dTDP-sugars generated in cytosol of engineered strains, YjiC solely transferred L-rhamnose from dTDP-L-rhamnose and tuned to rhamnosyltransferase. (C) 2016 Published by Elsevier Inc.</P>
Biosynthesis of a novel fisetin glycoside from engineered Escherichia coli
Pandey, R.P.,Parajuli, P.,Chu, L.L.,Kim, S.Y.,Sohng, J.K. Korean Society of Industrial and Engineering Chemi 2016 Journal of industrial and engineering chemistry Vol.43 No.-
<P>Escherichia coli BL21(DE3)/Delta pgi Delta zwf Delta galU mutant was engineered by overexpressing thymidine diphosphate (dTDP)-D-glucose synthase (tgs), dTDP-D-glucose 4,6-dehydratase (dh), and a sugar aminotransferase (wecE) from different sources to produce a pool of dTDP-4-amino-4,6-dideoxy-D-galactose in the cell cytosol. To this recombinant mutant, two Arabidopsis thaliana glycosyltransferases (ArGT-3 and ArGT-4) were overexpressed to generate two glycosylation platforms (E. coli BL21(DE3)/ Delta pgi Delta zwf Delta galUTDW-3 and E. coli BL21(DE3)/Delta pgi Delta zwf Delta galUTDW-4), which were accessed for the glycosylation of fisetin. As a result, one of the two systems, E. coli BL21(DE3)/Delta pgi Delta zwf Delta galUTDW-3, was able to conjugate 4-amino-4,6-dideoxy-D-galactose sugar at the 3-OH position of fisetin, producing an unnatural fisetin 3-O-4-amino-4,6-dideoxy-D-galactoside. (C) 2016 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.</P>
Pandey, R.,Yuldashev, S.,Nguyen, H.D.,Jeon, H.C.,Kang, T.W. Elsevier 2012 Current Applied Physics Vol.12 No.suppl4
In this work, we studied aluminium doped zinc oxide (AZO) and an annealing treatment on electrical and optical properties of films prepared by ultrasonic spray pyrolysis. In comparison with conventional methods, ultrasonic spray pyrolysis method provides advantages such as low equipment cost, good thickness uniformity over a large area, low temperature and low vacuum requirement in processing. Aluminium doped ZnO films were deposited on glass substrates with different doping concentrations. Detailed structural, electrical and optical measurements were conducted to resolve the effects of aluminium doped ZnO films. The resistivity was ~10<SUP>-3</SUP> Ω cm, carrier concentration ~10<SUP>20</SUP> cm<SUP>-3</SUP> and mobility ~7 cm<SUP>2</SUP>/Vs. The optical transmittance of films was higher than 80% and optical band-gap energy increases from 3.25 eV to 3.54 eV.
R. Pandey,S.H. Cho,D.K. Hwang,W.K. Choi 한국물리학회 2014 Current Applied Physics Vol.14 No.6
Transparent and conductive thin films of fluorine doped zinc tin oxide (FZTO) were deposited on glass substrates by radio-frequency (RF) magnetron sputtering using a 30 wt% ZnO with 70 wt% SnO2 ceramic targets. The F-doping was carried out by introducing a mixed gas of pure Ar, CF4, and O2 forming gas into the sputtering chamber while sputtering ZTO target. The effect of annealing temperature on the structural, electrical and optical performances of FZTO thin films has been studied. FZTO thin film annealed at 600 C shows the decrease in resistivity 5.47 103 U cm, carrier concentration w1019 cm3, mobility w20 cm2 V1 s1 and an increase in optical band gap from 3.41 to 3.60 eV with increasing the annealing temperatures which is well explained by BursteineMoss effect. The optical transmittance of FZTO films was higher than 80% in all specimens. Work function (f) of the FZTO films increase from 3.80 eV to 4.10 eV through annealing and are largely dependent on the amounts of incorporated F. FZTO is a possible potential transparent conducting oxide (TCO) alternative for application in optoelectronics.