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Pandey, Harsh Kumar,Hirwani, Chetan Kumar,Sharma, Nitin,Katariya, Pankaj V.,Dewangan, Hukum Chand,Panda, Subrata Kumar Techno-Press 2019 Advances in nano research Vol.7 No.6
The effect of an increasing percentage of nanofiller (glass cenosphere) with Glass/Epoxy hybrid composite curved panels modeled mathematically using the multiscale concept and subsequent numerical eigenvalues of different geometrical configurations (cylindrical, spherical, elliptical, hyperboloid and flat) predicted in this research article. The numerical model of Glass/Epoxy/Cenosphere is derived using the higher-order polynomial type of kinematic theory in association with isoparametric finite element technique. The multiscale mathematical model utilized for the customized computer code for the evaluation of the frequency data. The numerical model validation and consistency verified with experimental frequency data and convergence test including the experimental elastic properties. The experimental frequencies of the multiscale nano filler-reinforced composite are recorded through the impact hammer frequency test rig including CDAQ-9178 (National Instruments) and LABVIEW virtual programming. Finally, the nano cenosphere filler percentage and different design associated geometrical parameters on the natural frequency data of hybrid composite structural configurations are illustrated through a series of numerical examples.
Harsh Kumar Pandey,Himanshu Agrawal,Subrata Kumar Panda,Chetan Kumar Hirwani,Pankaj V Katariya,Hukum Chand Dewangan 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.73 No.6
The influence on flexural strength of Glass/Epoxy laminated composite curved panels of different geometries (cylindrical, spherical, elliptical, hyperboloid and flat) due to inclusion of nano cenosphere filler examined in this research article. The deflection responses of the hybrid structure are evaluated numerically using the isoparametric finite element technique and modelled mathematically via higher-order displacement structural kinematics. To predict the deflection values, a customised in-house computer code in MATLAB environment is prepared using the higher-order isoparametric formulation. Subsequently, the numerical model validity has been established by comparing with those of available benchmark solution including the convergence characteristics of the finite element solution. Further, a few cenosphere filled hybrid composite are prepared for different volume fractions for the experimental purpose, to review the propose model accuracy. The experimental deflection values are compared with the finite element solutions, where the experimental elastic properties are adopted for the computation. Finally, the effect of different variable design dependent parameter and the percentages of nano cenosphere including the geometrical shapes obtained via a set of numerical experimentation.
Bhargavaea indica sp. nov., a Member of the Phylum Firmicutes, Isolated from Arabian Sea Sediment
Pankaj Verma,성치남,Prashant Kumar Pandey,Ramesh Ramchandra Bhonde,Cathrin Spröer,Manfred Rohde,Yogesh Shreepad Shouche 한국미생물학회 2013 The journal of microbiology Vol.51 No.1
A Gram-positive, aerobic, coccoid-rod shaped, non-motile, catalase- and oxidase-positive bacterium, designated strain KJW98T, was isolated from the marine sediment of Karwar jetty, west coast of India. The strain was β-haemolytic, nonendospore-forming and grew with 0–8.5% (w/v) NaCl, at 15–48°C and at pH 6.5–9.0, with optimum growth with 0.5% (w/v) NaCl, at 42°C and at pH 7.0–8.0. Phylogenetic analyses based on 16S rRNA and gyrB gene sequences showed that strain KJW98T forms a lineage within the genus Bhargavaea. The G+C content of the genomic DNA was 55 mol%. The DNA–DNA relatedness values of strain KJW98T with B. beijingensis DSM 19037T, B. cecembensis LMG 24411T and B. ginsengi DSM 19038T were 43.2, 39 and 26.5%, respectively. The major fatty acids were anteiso-C15:0 (37.7%), iso-C15:0 (19.7%), anteiso-C17:0 (17.0%) and iso-C16:0 (11.1%). The predominant menaquinone was MK-8 and the cell-wall peptidoglycan was of A4α type with L-lysine as the diagnostic diamino acid. The major polar lipids were diphosphatidylglycerol and phosphatidylglycerol. The phenotypic, genotypic and DNA–DNA relatedness data indicate that strain KJW98T should be distinguished from the members of the genus Bhargavaea, for which the name Bhargavaea indica sp. nov. is proposed with the type strain KJW98T (=KCTC 13583T=LMG 25219T).
Kumar, Santosh,Garg, Pankaj,Pandey, Shambhavi,Kumari, Mridula,Hoon, Seonwoo,Jang, Kyoung-Je,Kapavarapu, Ravikumar,Choung, Pill-Hoon,Sobral, Abilio J. F. N.,Hoon Chung, Jong The Royal Society of Chemistry 2015 Journal of Materials Chemistry B Vol.3 No.17
<P>Gene therapy is the treatment of human disorders by the introduction of genetic material to specific target cells of a patient. Chitosan and its derivatives show excellent biological properties including biocompatibility, biodegradability and nonallergenicity. Primary amines of chitosan are responsible for its cationic nature and hence binding and protection of DNA for intracellular delivery. But the transfection efficiency of chitosan based gene transporters is severely hampered by its poor physical properties such as low water solubility and high viscosity. In this study, primary amines of low molecular weight (LMW) chitosan were coupled with 2-acrylamido-2-methylpropane sulphonic acid (AMP) making it water soluble for its application in gene delivery. AMP modified chitosan (CSAMP) showed an enhanced interaction with DNA and a higher buffering capacity due to AMP amines leading to a higher transfection efficiency in cancer cells (A549, HeLa and HepG2) compared to native chitosan and Lipofectamine®. <I>In vivo</I> studies in Balb/c through intravenous injection demonstrated a higher luciferase expression compared to LMW chitosan.</P>
Critical aspects of impedance spectroscopy in silicon solar cell characterization: A review
Yadav, Pankaj,Pandey, Kavita,Bhatt, Vishwa,Kumar, Manoj,Kim, Joondong PERGAMON 2017 RENEWABLE AND SUSTAINABLE ENERGY REVIEWS Vol.76 No.-
<P><B>Abstract</B></P> <P>Solar energy generation and utilization is dominated by silicon based solar photovoltaic technology, which has a market share of 80–90% of the solar photovoltaic industry worldwide. The performance indicating parameters of silicon solar cells include power conversion efficiency, series and shunt resistance, ideality factor and built-in potential. These parameters are mostly characterized by DC techniques, which is limited by its insufficiency to identify other important parameters such as interfacial diffusion and transition capacitance and resistive and capacitive components of p-p<SUP>+</SUP> interface of a silicon solar cell. Impedance spectroscopy is considered to be one of the most promising techniques for the characterization of abovementioned performance limiting parameters of a solar cell. In order to address the decoupling of various physical processes associated with different interfaces of a solar cell, quantitative analysis of the impedance spectroscopic data is required. An appropriate mathematical model is frequently used to correlate with the physical performance limiting parameters. This review presents a complete overview of the required mathematical models to analyse impedance spectroscopic data for interfacial processes of silicon solar cell.</P>
Verma, Pankaj,Pandey, Prashant Kumar,Gupta, Arvind Kumar,Seong, Chi Nam,Park, Seong Chan,Choe, Han Na,Baik, Keun Sik,Patole, Milind Shivaji,Shouche, Yogesh Shreepad Microbiology Society 2012 International journal of systematic and evolutiona Vol.62 No.10
<P>We have carried out a polyphasic taxonomic characterization of <I>Bacillus beijingensis</I> DSM 19037<SUP>T</SUP> and <I>Bacillus ginsengi</I> DSM 19038<SUP>T</SUP>, which are closely related phylogenetically to <I>Bhargavaea cecembensis</I> LMG 24411<SUP>T</SUP>. All three strains are Gram-stain-positive, non-motile, moderately halotolerant and non-spore-forming. 16S rRNA gene sequence analyses showed that the strains constituted a coherent cluster, with sequence similarities between 99.7 and 98.7 %. The percentage similarity on the basis of amino acid sequences deduced from partial <I>gyrB</I> gene nucleotide sequences of these three type strains was 96.1-92.7 %. Phylogenetic trees based on the 16S rRNA gene and GyrB amino acid sequences, obtained by using three different algorithms, were consistent and showed that these three species constituted a deeply rooted cluster separated from the clades represented by the genera <I>Bacillus</I>, <I>Planococcus</I>, <I>Planomicrobium</I>, <I>Sporosarcina</I>, <I>Lysinibacillus</I>, <I>Viridibacillus</I>, <I>Kurthia</I> and <I>Geobacillus</I>, supporting their placement in the genus <I>Bhargavaea</I>. All three type strains have menaquinone MK-8 as the major respiratory quinone and showed similar fatty acid profiles. The main polar lipids present in the three type strains were diphosphatidylglycerol and phosphatidylglycerol, and the three strains showed peptidoglycan type A4α with l-lysine as the diagnostic diamino acid. The DNA G<I>+</I>C contents of <I>Bacillus beijingensis</I> DSM 19037<SUP>T</SUP>, <I>Bacillus ginsengi</I> DSM 19038<SUP>T</SUP> and <I>Bhargavaea cecembensis</I> LMG 24411<SUP>T</SUP> were 53.1, 50.2 and 53.7 mol%, respectively. The level of DNA-DNA hybridization among the three strains was 57-39 %, indicating that they are members of different species of the genus <I>Bhargavaea</I>. The phenotypic data are consistent with the placement of these three species in a single genus and support their differentiation at the species level. On the basis of these data, we have emended the description of the genus <I>Bhargavaea</I> and propose the reclassification of <I>Bacillus beijingensis</I> and <I>Bacillus ginsengi</I> to the genus <I>Bhargavaea</I>, as <I>Bhargavaea beijingensis</I> comb. nov. (type strain ge10<SUP>T</SUP> = DSM 19037<SUP>T</SUP> = CGMCC 1.6762<SUP>T</SUP>) and <I>Bhargavaea ginsengi</I> comb. nov. (type strain ge14<SUP>T</SUP> = DSM 19038<SUP>T</SUP> = CGMCC 1.6763<SUP>T</SUP>).</P>
Aditya Narayan Shiv Shankar Swain,Suvankar Ganguly,Arunava Sengupta,Elanjickal Zachariah Chacko,Swapnil Dhakate,Pankaj Kumar Pandey 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.10
A coupled thermofluidic-mechanical model has been developed to analyse the thermomechanical state of the solidifying shellin a continuously cast steel billet. The computational fluid dynamics (CFD) based solver simulates the three-dimensionalflow field and solidification of molten steel as it flows inside the mould. Finite element method based thermomechanicalmodel is coupled with the CFD model to determine the resultant temperature distribution and stress–strain evolution in thesolidifying strand. The heat transfer at the mould-billet interface is taken into account by the calculation of heat flux using anovel inverse heat transfer algorithm. Temperature measurements made in the industrial billet mould have been used for thepurpose. Plant experiments and observations are correlated with the numerical results to provide quantitative understandingof the complex thermomechanical process during billet casting. Various parametric studies are also undertaken to examinethe effects of casting speed, superheat and heat flux changes on resultant strain and temperature distribution. It is observedthat the accumulated plastic strains exceed the critical strain at the off-corner region thereby indicating the possibility ofcrack formation in this region. Reduction of heat flux can lead to lowering of the strain rate at the corners and offer a viablesolution for reducing corner cracks.