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Meteorite impact craters as hotspots for mineral resources and energy fuels:A global review

Energy Geoscience 2022年第2期3卷 136-146页

作者： S.James Saranya R.Chandran M.Santosh A.P.Pradeepkumar M.N.praveen K.S Sajinkumar s sajinkumar 1 2department of geologyuniversity of keralathiruvananthapuram695581keralaindia school of earth science and resources china university of geosciencesbeijing100083china department of earth sciences university of adelaidesa5005australia geological survey of india bengaluru560111india department of geological and mining engineering and sciences michigan technological universityhoughton49931miusa

The ever-increasing recovery rate of natural resources from terrestrial impact craters over the last fewdecades across the globe offers new avenues for further exploration of mineral and hydrocarbon resources in such *** of today,60 of the 208 terrestrial craters have been identified to host diverseresources such as hydrocarbons,metals and construction *** potential of craters as plausibleresource contributors to the energy sector is therefore,worthy of consideration,as 42(70%)of the 60craters host energy resources such as oil,gas,coal,uranium,mercury,critical and major minerals as wellas hydropower *** others,19 craters are of well-developed hydrocarbon *** associated with craters are also classified similar to other mineral resources such as progenetic,syngenetic and epigenetic *** these,the progenetic and syngenetic mineralization are confinedto the early and late excavation stage of impact crater evolution,respectively,whereas epigenetic deposits are formed during and after the modification stage of crater ***,progenetic andsyngenetic mineral deposits(like Fe,Ni,Pb,Zn and Cu)associated with craters are formed as a directresult of the impact event,whereas epigenetic deposits(***)are hosted by the impactstructure and result from post-impact *** the progenetic and syngenetic deposits,the shockwave induced fracturing and melting aid the formation of deposits,whereas in the epigenetic deposits,the highly fractured lithostratigraphic units of higher porosity and permeability,like the centralelevated area(CEA)or the rim,act as *** this review,we provide a holistic view of the mineral andenergy resources associated with impact craters,and use some of the remote sensing techniques toidentify the mineral deposits as supplemented by a schematic model of the types of deposits formedduring cratering process.

关键词： Meteorite impact crater Progenetic deposit Syngenetic deposit Epigenetic deposit Mineralization Hydrocarbon Petroleum Exploration

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Effect of Rotation Under the Influence of Gravity Due to Various Sources in a Generalized Thermoelastic Medium

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Advances in Applied Mathematics and Mechanics 2010年第6期2卷 810-827页

作者： praveen Ailawalia Naib Singh Narah Department of Mathematics M.M.Engineering CollegeMaharishiMarkandeshwar UniversityMullanaDistrict AmbalaHaryanaIndia Department of Mathematics D.A.V CollegeAmbala CityHaryanaIndia

The present problem is concerned with the study of deformation of a rotating generalized thermoelastic medium under the influence of *** components of displacement,force stress and temperature distribution are obtained in Laplace and Fourier domain by applying integral *** components are then obtained in the physical domain by applying a numerical inversion *** particular cases are also discussed in context of the *** results are also presented graphically to show the effect of rotation and gravity in the medium.

关键词： Rotation gravity generalized thermoelasticity Laplace and Fourier transforms temperature distribution

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Homotopy Perturbation Method for Time-Fractional Shock Wave Equation

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Advances in Applied Mathematics and Mechanics 2011年第6期3卷 774-783页

作者： Mithilesh Singh praveen Kumar Gupta Department of Mathematics Dehradun Institute of TechnologyDehradunIndia Department of Applied Mathematics Institute of TechnologyBanaras Hindu UniversityVaranasiIndia

A scheme is developed to study numerical solution of the time-fractional shock wave equation and wave equation under initial conditions by the homotopy perturbation method(HPM).The fractional derivatives are taken in the Caputo *** solutions are given in the form of series with easily computable *** results are illustrated through the graph.

关键词： Partial differential equation fractional derivative shock wave equation homotopy perturbation method

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Single-Step Arbitrary Lagrangian-Eulerian Discontinuous Galerkin Method for 1-D Euler Equations

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Communications on Applied Mathematics and Computation 2020年第4期2卷 541-579页

作者： Jayesh Badwaik praveen Chandrashekar Christian Klingenberg Department of Mathematics University of WürzburgWürzburgGermany TIFR Center for Applicable Mathematics BangaloreIndia

We propose an explicit,single-step discontinuous Galerkin method on moving grids using the arbitrary Lagrangian-Eulerian approach for one-dimensional Euler *** grid is moved with the local fluid velocity modified by some smoothing,which is found to con-siderably reduce the numerical dissipation introduced by Riemann *** scheme preserves constant states for any mesh motion and we also study its positivity preservation *** grid refinement and coarsening are performed to maintain the mesh qual-ity and avoid the appearance of very small or large ***,higher order methods are developed and several test cases are provided to demonstrate the accuracy of the proposed scheme.

关键词： Discontinuous Galerkin method Moving meshes Arbitrary Lagrangian-Eulerian Euler equations

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mRNA profiles of piRNA pathway genes in emerald ash borer Agrilus planipennis

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Insect Science 2012年第4期19卷 455-460页

作者： Omprakash Mittapalli praveen Mamidala Swapna Priya Rajarapu Department of Entomology The Ohio State University Ohio Agricultural and Research Development Center Wooster OH USA

Recent advances of Piwi-interacting RNAs （piRNAs） have enabled a better understanding of their putative roles in the protection of gerrn cells against selfish genetic elements. The germ plasm proteins namely, PIWI and VASA, are key players in regulation of piRNAs. However, the biogenesis of piRNAs remains poorly understood. We report the characterization and the transcript profiles of a PIWI and VASA gene in various tissues and developmental stages of the emerald ash borer （Agrilusplanipennis）, an exotic invasive insect pest that has attained a high impact status worldwide. The deduced amino acid sequences of both these genes （herein referred to ＂ApPIWI and ApVASA＂） revealed homology with similar proteins from other insect and non-insect taxa. Peak transcript levels for ApPIWI and ApVASA were observed in the ovaries （compared to the other tissues assayed） and in adults （compared to the other developmental stages assayed）. To our knowledge this is the first report of profiling piRNA pathway genes in A. planipennis. These results provide new insights into the putative function of the PIWI and VASA proteins in insects.

关键词： Agrilus planipennis piRNA PIWI VASA transcript

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Validation of reference genes for gene expression studies in the emerald ash borer （Agrilus planipennis）

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Insect Science 2012年第1期19卷 41-46页

作者： Swapna Priya Rajarapu praveen Mamidala Omprakash Mittapalli Department of Entomology The Ohio State University Ohio Agricultural and Research Development Center Wooster OH 44691 USA

The Emerald ash borer （EAB, Agrilus planipennis Fairmaire） an exotic invasive insect pest has killed millions of ash trees （Fraxinus spp.） across North America and threatens billions more. We validated six A. planipennis reference genes （actin, ACT; beta tubulin, E-TUB; glyceraldehyde-3-phosphate dehydrogenase, GAPDH ; ribosomal protein, RPL7; translation elongation factor 1~, TEF-la; and ubiquitin, UBQ） using geNorm, Normfinder and BestKeeper for accurate determination of target messenger RNA levels in gene expression studies. The stability of the six reference genes was evaluated in different larval tissues, developmental stages and two treatments ofA. planipennis using quantitative real-time polymerase chain reaction. Although there was no consistent ranking observed among the reference genes across the samples, the overall analysis revealed TEF-la as the most stable reference gene. GAPDH and ACT showed least stability for all the samples studied. We conclude that TEF-I~ is the most appropriate reference gene for gene expression studies in A. planipennis. Results obtained can be applicable for transcript profiling in other invasive insect pests. Further, these validated reference genes could also serve as the basis for selection of candidate reference genes in any given insect system post-validation.

关键词： Agrilus planipennis BestKeeper geNorm normalization Normfinder quantitative real-time PCR reference genes

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Pediatric and neonatal mechanical ventilation（Second Edition） 2

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2011年

作者： praveen Khilnani

Previous ed.: ***, 289 p. : ill. (some col.), [9] *** plates ; 24 cm. + 1 DVD-ROM (4 3/4 in.)

ISBN: (纸本)9789350252451

Previous ed.: ***, 289 p. : ill. (some col.), [9] *** plates ; 24 cm. + 1 DVD-ROM (4 3/4 in.)

关键词： Pediatric. Respiratory therapy.

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Improvising Personalized Travel Recommendation System with Recency Effects

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Big Data Mining and Analytics 2021年第3期4卷 139-154页

作者： Paromita Nitu Joseph Coelho praveen Madiraju Department of Mathematical and Statistical Sciences Marquette UniversityMilwaukeeWI 53233USA Department of Computer Science Marquette UniversityMilwaukeeWI 53233USA

A travel recommendation system based on social media activity provides a customized place of interest to accommodate user-specific needs and preferences. In general, the user’s inclination towards travel destinations is subject to change over time. In this project, we have analyzed users’ twitter data, as well as their friends and followers in a timely fashion to understand recent travel interest. A machine learning classifier identifies tweets relevant to travel. The travel tweets are then used to obtain personalized travel recommendations. Unlike most of the personalized recommendation systems, our proposed model takes into account a user’s most recent interest by incorporating time-sensitive recency weight into the model. Our proposed model has outperformed the existing personalized place of interest recommendation model, and the overall accuracy is 75.23%.

关键词： travel recommendation time sensitivity recency effect personalization social media

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Low Thrust Minimum Time Orbit Transfer Nonlinear Optimization Using Impulse Discretization via the Modified Picard–Chebyshev Method

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Computer Modeling in Engineering & Sciences 2016年第1期111卷 1-27页

作者： Darin Koblick Shujing Xu Joshua Fogel praveen Shankar California State University-Long Beach CAUSA. Millennium Space Systems Inc. El SegundoCAUSA. Claremont Graduate University CAUSA. University of California-San Diego CAUSA. University of Southern California Los AngelesCAUSA.

The Modified Picard-Chebyshev Method(MPCM)is implemented as an orbit propagation solver for a numerical optimization method that determines minimum time orbit transfer trajectory of a satellite using a series of multiple impulses at intermediate *** waypoints correspond to instantaneous impulses that are determined using a nonlinear constrained optimization routine,SNOPT with numerical force models for both Two-Body and J2 *** is found that using the MPCM increases run-time performance of the discretized lowthrust optimization method when compared to other sequential numerical solvers,such as Adams-Bashforth-Moulton and Gauss-Jackson 8th order methods.

关键词： Low Thrust Picard–Chebyshev Optimization Multi-Impulse Boundary Value Problem.

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Oxidative Stressand Antioxidant Responses in Young Leaves of Mulberry Plants Grown Under Nitrogen, Phosphorus or Potassium Deficiency

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Journal of Integrative Plant Biology 2007年第3期49卷 313-322页

作者： Rajesh Kumar Tewari praveen Kumar Parma Nand Sharma Department of Botany University of LucknowLucknow226007India

The aim of this study was to associate the generation of reactive oxygen species （ROS） with Induced antloxidant responses and disturbed cellular redox environment in the nitrogen-（N）, phosphorus-（P）, or potassium-（K） deftcient mulberry （Morus alba L. var. Kanva-2） plants. The indicators of oxidative stress and cellular redox environment and antioxldant defense-related parameters were analyzed. Oeficlency of N, P or K suppressed growth, accelerated senescence, and decreased concentrations of chloroplastic pigments and glutathione. Lipid peroxidation and activities of superoxide dismutase, ascorbate peroxidase and glutathione reductase were also increased in these N, P, or K deprived plants. Concentration of hydrogen peroxide Increased in plants deficient in N or P. Oeficlency of N or P particularly altered the cellular redox environment as indicated by changes in the redox couples, namely ascorbic acid/total ascorbate decreased in P-, glutathione sulfydryl/total glutathione decreased in N-, and Increased in P-deficient plants. Activity staining of native gels for superoxide dismutase revealed Increased activity as Indicated by Increased intensity of bands, and induction of few new isoforms in P- and K-deficient plants. Oifferences in the patterns of superoxide dismutase isoforms and redox status （ascorbic acid/total ascorbate and glutathlone sulfydryl/total glutathione） Indicate that N-, P-, or K-deficiency altered antioxidant responses to varying extents in mulberry plants.

关键词： antioxidants potassium-deficiency lipid peroxidation Morus alba mulberry nitrogen-deficiency oxidative stress phosphorus-deficiency reactive oxygen species

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