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Molecular Characterization of <i>Pseudomonas</i>spp. Isolated from Root Nodules of Various Leguminous Plants of Shekhawati Region, Rajasthan, India

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American Journal of Plant Sciences 2012年第1期3卷 60-63页

作者： Sakshi Issar Saroj Sharma devendra Kumar choudhary Hemant Kumar Gautam R. K. Gaur 不详

Plant growth promontory Pseudomonas strains were isolated from root nodules of five plant species, viz., Trifolium pretense, Cicer arietinum, Amaranthus polygamus, Vigna mungo, and Trigonella foenum;that plants were denizen of Shekhawati region of Rajasthan. A total of 8 bacterial isolates were evaluated for growth promotion using PGP properties. Partial 16S rDNA sequencing data showed that these 8 bacterial isolates belonged to genus Pseudomonas. MEGA 4.0.2, software was used to construct a neighbor joining tree by employing boot strap method. Result exhibited significant diversity among recovered Pseudomonas strains.

关键词： PGPRs 16S Sequencing Pseudomonas Root-Nodule Bacteria 16S rDNA

Structural-Nanomechanical Property Correlation of Shallow Water Shrimp （Pandalus platyceros） Exoskeleton at Elevated Temperature

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Journal of Bionic Engineering 2014年第3期11卷 360-370页

作者： devendra Verma Vikas Tomar School of Aeronautics and Astronautics Purdue University West Lafayette IN 47907 USA

This investigation reports the nanomechanical properties of shallow water shrimp exoskeleton at temperatures ranging from 30 ℃ to 80 ℃ measured using nanoindentation experiments. Scanning Electron Microscopy （SEM） measurements suggest that the shrimp exoskeleton has the Bouligand structure in its layers, a key characteristic of the crustaceans. The thickness of the layers and packing density are found to be different from that of lobsters and crabs reported earlier in the literature. Mechanical properties at high temperatures are determined using micro materials nanoindentation test set up combined with the hot stage. The properties measured during nanoindentation test are corrected for the creep and thermal drift during the experiments. The reduced modulus values are found to be around 28 GPa at 30 ℃ that reduces to approximately 24 GPa at 80 ℃. The hardness values also decrease from 1.6 GPa at 30 ℃ to around 1.2 GPa at 80 ℃. The indentation size effect is found to be absent at all temperatures. Creep mechanisms of polymers like materials and its temperature dependence are discussed to give more insight into the deformation mechanism.

关键词： fresh water shrimp nanomechanics temperature dependence creep mechanism

The Impingement Heat Transfer Data of Inclined Jet in Cooling Applications: A Review

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Journal of Thermal Science 2020年第1期29卷 1-12页

作者： PAWAR Shashikant PATEL devendra Kumar SMEC Vellore Institute of Technology

On the impingement heat transfer data,the experimental studies of air and liquid jets impingement to the flat surfaces were collected and critically *** oblique impingements of both single circular and planar slot jets were considered in *** review focused on the surface where the jet impingement cooling technique was *** nozzle exit Reynolds numbers based on the hydraulic diameter varied in the range of 1,500–52,*** oblique angles relative to the plane surface and the dimensionless jet-to-plate spacing vary in the range of 15°–90°and 2–12 *** review suggested that the magnitude of maximum heat transfer shifted more for air jets compared with the liquid *** drop in the inclination angle and the jet-to-plate separation led to the increase in the asymmetry of heat transfer *** displacement of maximum Nusselt number(heat transfer)locations was found to be sensitive to the inclination angle and the smaller jet-to-plate ***,the Nusselt number correlations proposed by various researchers were discussed and compared with the results of the cited references.

关键词： heat and fluid flow jet impingement Nusselt number oblique angle

Strength and elongation of spray formed Al–Si–Pb alloys

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International Journal of Minerals,Metallurgy and Materials 2014年第12期21卷 1222-1227页

作者： Aruna Tomar Rashmi Mittal devendra Singh Department of Metallurgical and Materials Engineering Indian Institute of Technology Roorkee

The strength and elongation to fracture of spray deposited Al-Si-Pb alloys were studied as a function of lead content, silicon content, and distance from the centre to periphery of the deposit. It is found that the ultimate tensile strength, proof stress and elongation to fracture decrease, linearly and exponentially, with the increase in lead content and porosity of the deposit, respectively. Both the strengths and elongation to fracture linearly increase with increasing distance from the centre to periphery of the deposit. The ultimate tensile strength and proof stress are higher at a higher silicon content and they have a linear relationship with the hardness of the deposit.

关键词： aluminum silicon alloys spray forming tensile strength proof stress elongation

Probing the degradation of pharmaceuticals in urine using MFC and studying their removal efficiency by UPLC-MS/MS

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Journal of Pharmaceutical Analysis 2021年第3期11卷 320-329页

作者： Priya Sharma devendra Kumar Srikanth Mutnuri Applied Environmental Biotechnology Laboratory Birla Institute of Technology&Science(BITS)Pilani403726ZuarinagarIndia Central Sophisticated Instrumentation Facility Birla Institute of Technology&Science(BITS)Pilani403726ZuarinagarIndia Department of Pharmaceutical Sciences College of PharmacyUniversity of Nebraska Medical CenterOmahaNE68198-602USA

Nutrient recovery from source-separated human urine has attracted interest as it is rich in nitrogen and phosphorus that can be utilized as ***,urine also contains pharmaceuticals,steroid hormones,*** their removal is crucial as they have detrimental effects on the environment and human *** current study focuses on investigating the degradation of pharmaceuticals using a double-chamber microbial fuel cell(MFC).Urine was spiked with four pharmaceuticals(trimethoprim,lamivudine,levofloxacin,and estrone)at a concentration of 2 mg/*** MFC was operated for 7 months in batch mode with this spiked urine as *** degradation efficiency of the MFC was studied,for which a selective liquid chromatography-tandem mass-spectrometric method was developed for the quantitation of compounds used in the spiking experiments and was validated with a lower limit of quantification of 0.39 ng/*** maximum removal rate achieved was 96%±2%.The degradation mechanism involved processes like sorption and anoxic *** voltage curve obtained showed that the presence of pharmaceuticals had an initial negative impact on power generation along with increased organic content;however,after the reactor acclimatization,increased power output was achieved with maximum organics removal at 30 h of retention *** work opens a new perspective for the anoxic biodegradation of pharmaceuticals and can be useful in future bioremediation studies.

关键词： Pharmaceuticals Urine MFC Biodegradation Liquid chromatography mass spectroscopy

Power Generalized Weibull Distribution Based on Record Values and Associated Inferences with Bladder Cancer Data Example

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Communications in Mathematics and Statistics 2024年第2期12卷 213-238页

作者： devendra Kumar Manoj Kumar Jagdish Saran Department of statistics Central University of HaryanaJant-PaliMahendergarhIndia Department of Statistics University of DelhiDelhiIndia

The power generalized Weibull distribution has been proposed recently by[24]as an alternative to the gamma,Weibull and the exponentiated Weibull *** power generalized Weibull family is suitable for modeling data that indicate nonmonotone hazard rates and can be used in survival analysis and reliability *** andﬂexibility of the family are illustrated by reanalyzing Efron’s data pertaining to a head-and-neck cancer clinical *** data involve censoring and indicate unimodal hazard *** this distribution,some recurrence relations are established for the single and product moments of upper record ***,using these relations,we have obtained means,variances and covariances of upper record values from samples of sizes up to 10 for various values of the parameters and present them inﬁ*** data set is analyzed to illustrate theﬂexibility and importance of the model.

关键词： Record values Moments Characterization Power generalized Weibull distribution

VARIABLE MESH FINITE DIFFERENCE METHOD FOR SELF-ADJOINT SINGULARLY PERTURBED TWO-POINT BOUNDARY VALUE PROBLEMS

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Journal of Computational Mathematics 2010年第5期28卷 711-724页

作者： Mohan K.Kadalbajoo devendra Kumar Department of Mathematics & Statistics

A numerical method based on finite difference method with variable mesh is given for self-adjoint singularly perturbed two-point boundary value problems. To obtain parameter- uniform convergence, a variable mesh is constructed, which is dense in the boundary layer region and coarse in the outer region. The uniform convergence analysis of the method is discussed. The original problem is reduced to its normal form and the reduced problem is solved by finite difference method taking variable mesh. To support the efficiency of the method, several numerical examples have been considered.

关键词： Singularly perturbed boundary value problems Finite difference method,Boundary layer Parameter uniform-convergence Variable mesh.

Establishing two-stage interaction between fly ash and NaOH by X-ray and infrared analyses

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Frontiers of Environmental Science & Engineering 2015年第2期9卷 216-221页

作者： Bhagwanjee JHA Nevin KOSHY devendra Narain SINGH Civil Engineering Department Indian Institute of Technology Bombay Mumbai 400076 India

The interaction of the fly ash and NaOH, in an open reflux hydrothermal system at 100℃, has been explored by several researchers and formation of fly ash zeolites has been confirmed based on the X-ray diffraction analysis of the residues. However, this method does not reveal much about the characteristic transitions （viz. elemental, electro-negativity and cation exchange capa- city） of the residues. In this situation, resorting to Fourier transform-infrared radiation （FT-IR） spectroscopy on the residues obtained from two-stage hydrothermal treatment process, described in this manuscript, appears to be a novel idea to establish transitions in chemical bonds （viz., -Si- OH-AI-, OH-Na, OH-A1-）, crystallinity and cation exchange capacity of these residues. Based on extensive studies, it has been demonstrated that FT-IR spectroscopy is extremely useful for 1） detection of chemical bonds in the residues, 2） evaluation of zeolites in the residues and 3） also establishing the superiority of the two-stage interac- tion of the fly ash with NaOH for synthesizing better fly ash zeolites （viz., Na-P1 and Hydroxysodalte） as compared to those obtained from the conventional single-stage treatment of the fly ash.

关键词： hydrothermal treatment alkali activation flyash zeolites X-ray diffraction (XRD) and Fourier transform-infrared radiation (FT-IR) spectroscopy

Statistical Inference of Exponentiated Moment Exponential Distribution Based on Lower Record Values

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Communications in Mathematics and Statistics 2017年第3期5卷 231-260页

作者： devendra Kumar Tanujit Dey Sanku Dey Department of Statistics Central University of HaryanaJant-PaliMahendergarh 123031HaryanaIndia Department of Quantitative Health Sciences Cleveland ClinicClevelandOH 44121USA Department of Statistics St.Anthony’s CollegeShillongMeghalayaIndia

Based on lower record values,we first derive the exact explicit expressions as well as recurrence relations for the single and product moments of record values and then use these results to compute the means,variances and coefficient of skewness and kurtosis of exponentiated moment exponential distribution(EMED),a new extension of moment exponential distribution,recently introduced by Hasnain(Exponentiated moment exponential ***,2013).Next we obtain the maximum likelihood estimators of the unknown parameters and the approximate confidence intervals of the ***,we consider Bayes estimation under the symmetric and asymmetric loss functions using gamma priors for both shape and scale *** have also derived the Bayes interval of this distribution and discussed both frequentist and the Bayesian prediction intervals of the future record values based on the observed record *** Carlo simulations are performed to compare the performances of the proposed methods,and a data set has been analyzed for illustrative purposes.

关键词： Lower record values Single and product moments Recurrence relations Bayes estimator General entropy loss function Maximum likelihood estimator