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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.,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>
Microsatellite Analysis of Three Poultry Breeds of India
Pandey, A.K.,Tantia, M.S.,Kumar, Dinesh,Mishra, Bina,Chaudhary, Preeti,Vijh, R.K. Asian Australasian Association of Animal Productio 2002 Animal Bioscience Vol.15 No.11
The genetic variability of three poultry breeds namely Aseel, Miri and Nicobari taken from different geographical locations of India were evaluated using 15 microsatellite loci. No. of alleles varied from 3 to 9 in Aseel, 3 to 8 in Miri and 2 to 7 in Nicobari. Mean PIC values in Aseel, Miri and Nicobari breeds were 0.64, 0.66 and 0.63, respectively. Average unbiased heterozygosity and direct count heterozygosity were 0.65 and 0.59, 0.68 and 0.61, and 0.64 and 0.57 in Aseel, Miri and Nicobari breeds, respectively. High heterozygosity values revealed in this study are indicative of low level of inbreeding, large population size and no or low selection pressure for commercial trait in all three populations. The estimate of genetic distances using Nei's standard, Nei's minimum and Reynold's distance revealed Aseel and Nicobari to be more closely related than Miri breed of poultry.
A review of techniques for the determination of polycyclic aromatic hydrocarbons in air
Pandey, S.K.,Kim, K.H.,Brown, R.J.C. Elsevier Scientific Pub. Co 2011 Trends in analytical chemistry Vol.30 No.11
We provide an extensive review of the common methodologies employed in the analysis of airborne polycyclic aromatic hydrocarbons (PAHs). The review focuses on gas-chromatography-based approaches, in the light of their universal application with excellent separation, resolution, and sensitivity. We first describe collection methods for airborne PAHs in the gas and particle phases. We then evaluate the efficiency of extraction techniques employed for separating target PAHs from sampling media, using conventional solvent-based and emerging thermal-desorption approaches. We also describe commonly employed analytical methods with respect to their applicability to PAHs in gas and particle phases, collected from diverse environmental settings. As an essential part of basic quality assurance, we examine each method with special emphasis on key parameters (e.g., limit of detection and reproducibility). Finally, we address the likely directions of methodological developments, their limitations, and the future prospects for PAH analysis.
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.
Singh, R.P.,Sastry, K.V.H.,Pandey, N.K.,Shit, N.G.,Agarwal, R.,Singh, R.,Sharma, S.K.,Saxena, V.K.,Jagmohan, Jagmohan Asian Australasian Association of Animal Productio 2011 Animal Bioscience Vol.24 No.8
The LDH isozymes are key catalysts in the glycolytic pathway of energy metabolism. It is well known that the distribution of the LDH isozymes vary in accordance with the metabolic requirements of different tissues. The substrates required for energy production change noticeably at successive stages of testes development suggesting a significant flexibility in the expression of glycolytic enzymes. Therefore, expression of LHDA and LDHB mRNAs was examined in adult and prepubertal quail testis. The mRNA of both LDHA and LDHB were expressed and no significant difference was observed in prepubertal testes. The mRNA levels of LDHB significantly increased during testicular development. In the adult testis, LDHA mRNA was not expressed. Expression studies revealed the presence of different LDH isozymes during testicular development. In contrast, electrophoresis of both testicular samples revealed only single band at a position indicative of an extreme type of LDH isozyme in quail testes. Furthermore, nucleotide and amino acid sequence analysis revealed significant similarity to chicken, duck and rock pigeon. These sequence results confirmed the similarity of LDHA and LDHB subunit protein in different avian species.
A. K. Pandey,Dinesh Kumar,Rekha Sharma,Uma Sharma,R. K. Vijh,S. P. S. Ahlawat 아세아·태평양축산학회 2005 Animal Bioscience Vol.18 No.7
Genetic variation at 25 microsatellite loci, population structure, and genetic bottleneck hypothesis were examined for Ankleshwar poultry population found in Gujrat, India. The estimates of genetic variability such as effective number of alleles and gene diversities revealed substantial genetic variation frequently displayed by microsatellite markers. The average polymorphism across the studied loci and the expected gene diversity in the population were 6.44 and 0.670짹0.144, respectively. The population was observed to be significantly differentiated into different groups, and showed fairly high level of inbreeding (f = 0.240짹0.052) and global heterozygote deficit. The bottleneck analysis indicated the absence of genetic bottleneck in the past. The study revealed that the Ankleshwar poultry breed needs appropriate genetic management for its conservation and improvement. The information generated in this study may further be utilized for studying differentiation and relationships among different Indian poultry breeds.
Chaudhuri, S,Pandey, N K,Saini, Shrikant,Budhani, R C IOP Pub 2010 Journal of Physics, Condensed Matter Vol.22 No.27
<P>A dramatic drop of ≈5 orders of magnitude in the resistance (<I>R</I>) of La<SUB>0.175</SUB>Pr<SUB>0.45</SUB>Ca<SUB>0.375</SUB>MnO<SUB>3</SUB> epitaxial films upon exposure to optical photons derived from both continuous and pulsed lasers, as well as broad-band sources at temperatures (<I>T</I>) < 30 K is reported. The strength of change is a sensitive function of both the incident photon flux and temperature. Under isothermal conditions the photo-generated low resistance state persists eternally after removal of light. This non-equilibrium state is metallic, as revealed by the positive d<I>R</I>/d<I>T</I> for <I>T</I> ≤ <I>T</I><SUB><I>p</I></SUB> (≈120 K). This electrically conducting state is presumably ferromagnetic as <I>T</I><SUB><I>p</I></SUB> coincides with the temperature where a weak ferromagnetism sets in on cooling the insulating film from room temperature. To rule out the possibility of photon-induced local heating of the sample as a mechanism of the observed effects, photo-illumination experiments were performed under identical conditions on thin films of two non-charge-ordered manganites deposited on substrates of similar thermal conductivity. Our model for the observed transition encompasses a global charge-ordered state in which ferromagnetic metallic clusters of fraction <I>p</I> much less than the critical fraction <I>p</I><SUB>c</SUB> for percolation exists at low temperatures. Photo-induced melting of the charge-ordered state increases this fraction beyond <I>p</I><SUB>c</SUB> in a cumulative manner as successive pulses of light fall on the sample. </P>