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A remote sensing based analysis of climate change in Sikkim supported by evidence from the field

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Journal of Mountain Science 2021年第5期18卷 1256-1267页

作者： Rumia BASU Gourav misra Dipto SARKAR Department of Earth and Ocean Sciences National University of IrelandH91TK33 GalwayIreland Department of Geography University College CorkT12K8AF CorkIreland Department of Geography and Environmental Studies Carleton UniversityK1S5B6 OttawaCanada

The Himalayas hailed as the‘water towers of the world’feed many perennial rivers which form the lifeline of the Indian *** change induced rising global temperatures and changing rainfall patterns are currently threatening the glaciers that feed the *** combination of these factors is causing water stresses to a part of the world which is usually considered water *** there are some large-scale studies done in the Himalayas,regional analysis of changing rainfall patterns and their impacts on vegetation and agriculture is *** we focus on the Indian state of Sikkim located in the Eastern Himalayas to evaluate these issues using mixed *** use satellite data from PERSIANN and MODIS to characterise the regional rainfall,vegetation,and surface temperature trends between 2001 and *** the analysis shows overall declining rainfall trends across most land cover classes,the trends in temperature are mostly positive for the period of study,with winter Land Surface Temperature(LST)values showing the largest area with marginally significant(p<0.1)positive *** contrast,such patterns are not observed for ***,the interviews corroborate that even agriculture is impacted,implying that the trends continue at finer spatial scales *** lack of government support for adaptation and mitigation is also lamented placing the communities at a precarious position to continuing climate change.

关键词： Climate change Rainfall Temperature Vegetation Mixed methods Sikkim

Use of stimulatory responsive soft nanoparticles for intracellular drug delivery

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Nano Research 2023年第5期16卷 6974-6990页

作者： Krystal A Hughes Bishal misra Maryam Maghareh Sharan Bobbala Department of Pharmaceutical Sciences West Virginia University School of PharmacyMorgantownWV 26505USA Department of Clinical Pharmacy West Virginia University School of PharmacyMorgantownWV 26505USA

Drug delivery has made tremendous advances in the last *** therapies are increasingly common,with intracellular delivery highly impactful and sought *** drug delivery systems have limitations due to imprecise and non-targeted release *** way this can be addressed is through using stimuli-responsive soft nanoparticles,which contain materials with an organic backbone such as lipids and *** choice of biomaterial is essential for soft nanoparticles to be responsive to internal or external *** nanoparticle must retain its integrity and payload in non-targeted physiological conditions while responding to particular intracellular environments where payload release is *** internal and external factors could stimulate the intracellular release of drugs from *** stimuli include pH,oxidation,enzymes,while external stimuli include ultrasound,light,electricity,magnetic *** responsive soft nanoparticulate systems specifically utilized to modulate intracellular delivery of drugs are explored in this review.

关键词： nanoparticles biomaterials stimuli-responsive targeted delivery intracellular drug delivery

GIS based integration of multi-spectral remote sensing and morphostructural analysis for delineating potential areas of hydrocarbon exploration in Western Vindhyan Basin,India

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Energy Geoscience 2022年第2期3卷 191-201页

作者： Subhobroto Mazumde Ashish misra Remote Sensing&Geomatics KDM Institute of Petroleum ExplorationOil and Natural Gas Corporation LimitedIndia

The Chambal Valley forms the western part of the Proterozoic Vindhyan Basin that has been less studied and poorly explored from the hydrocarbon perspective than its eastern counterpartdthe Son Valley *** the present manuscript,attempts have been made to use remote sensing and GIS(geographic information system)based analysis to focus on the northern part of Chambal Valley to decipher its tectonics and structural configuration,its tectonic relation with the Son Valley Vindhyans,Bundelkhand Massif and Ganga *** study also assumes significance as it attempts to delineate potential lead areas for hydrocarbon exploration in Chambal *** part of the study,a detailed spectral analysis based on image data sets is carried out to identify areas of microseeps as proxies of potential hydrocarbon ***,a neotectonics-based geomorphic analysis is carried out to delineate a fault network and geomorphic highs that act as aliases to subsurface faults and structural *** results are subsequently validated by available geophysical data and extensive fieldwork,and suggest four structural trends in the Chambal Valley as striking NE-SW,E-W,NW-SE and NeS,of which the NW-SE trend is the oldest,followed by the NE-SW,E-W and NeS trends.A GIS-based analysis of the E-W trends indicates that these are probably manifestations of the westward continuity of E-W-trending shear zones developed in Bundelkhand massif within the basement of the Chambal *** remote sensing studies of the shear zone network exposed in the Bundelkhand massif indicate the pattern to be replicated on a larger scale in the morphostructural fault layout in the adjacent Ganga Basin,implying these shear zones may be continuing in the basement of Ganga Basin and controlling structures developed later,and consequently the different petroleum system elements in the basin.A dip data based structural analysis of the Chambal Valley describes a regional synform attributed with an almost

关键词： Chambal Vindhyans Hydrocarbon Remote sensing Shear zone Syncline

Controlled deployment of a long tether to operate as a partial space elevator

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Astrodynamics 2024年第2期8卷 311-321页

作者： Jinbang Huang Arun K.misra Department of Mechanical Engineering McGill UniversityMontrealQCH3A 0C3Canada

The deployment of a long tether to operate as a partial space elevator,starting from a nucleus in geostationary orbit,is *** deployment is an inherently unstable process because the center of orbit gradually decreases from the geostationary altitude when deployment *** is also observed that the elasticity of the tether has an important effect on deployment *** is shown that the application of a transverse force on the main spacecraft,determined by using linear state feedback and appropriate gains,can stabilize the *** LQR controller is *** of the dynamics of the system are carried out using this controller for various parametric values of tether elasticity,deployment rates,etc.,to evaluate the efficacy of the controller.

关键词： tether space elevator deployment stability control

Model Predictive Control of Resonant Systems Using Kautz Model

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International Journal of Automation and computing 2016年第5期13卷 501-515页

作者： Shamik misra Rajasekhara Reddy Prabirkumar Saha Department of Chemical Engineering Indian Institute of Technology Guwahati

The scope of this paper broadly spans in two areas： system identification of resonant system and design of an efficient control scheme suitable for resonant systems. Use of filters based on orthogonal basis functions （OBF） have been advocated for modelling of resonant process. Kautz filter has been identified as best suited OBF for this purpose. A state space based system identification technique using Kautz filters, viz. Kautz model, has been demonstrated. Model based controllers are believed to be more efficient than classical controllers because explicit use of process model is essential with these modelling techniques. Extensive literature search concludes that very few reports are available which explore use of the model based control studies on resonant system. Two such model based controllers are considered in this work, viz. model predictive controller and internal model controller. A model predictive control algorithm has been developed using the Kautz model. The efficacy of the model and the controller has been verified by two case studies, viz. linear second order underdamped process and a mildly nonlinear magnetic ball suspension system. Comparative assessment of performances of these controllers in those case studies have been carried out.

关键词： Model predictive control resonant systems Kautz model orthonormal basis function internal model control

Broadband spectral fitting of blazars using XSPEC

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Research in Astronomy and Astrophysics 2018年第3期18卷 105-120页

作者： Sunder Sahayanathan Atreyee Sinha Ranjeev misra Astrophysical Sciences Division Bhabha Atomic Research Centre Mumbai - 400085 India Inter-University Centre for Astronomy and Astrophysics Pune-411007 India

The broadband spectral energy distribution（SED） of blazars is generally interpreted as radiation arising from synchrotron and inverse Compton mechanisms. Traditionally,the underlying source parameters responsible for these emission processes,like particle energy density,magnetic field,etc.,are obtained through simple visual reproduction of the observed fluxes. However,this procedure is incapable of providing confidence ranges for the estimated parameters. In this work,we propose an efficient algorithm to perform a statistical fit of the observed broadband spectrum of blazars using different emission models. Moreover,we use the observable quantities as the fit parameters,rather than the direct source parameters which govern the resultant SED. This significantly improves the convergence time and eliminates the uncertainty regarding initial guess parameters. This approach also has an added advantage of identifying the degenerate parameters,which can be removed by including more observable information and/or additional constraints. A computer code developed based on this algorithm is implemented as a user-defined routine in the standard X-ray spectral fitting package,XSPEC. Further,we demonstrate the efficacy of the algorithm by fitting the well sampled SED of blazar 3 C 279 during its gamma ray flare in 2014.

关键词： galaxies active-BL Lacertae objects general - quasars individual (3C 279) - relativistic processes - radiation mechanisms non-thermal

Numerical study of flow and heat transfer during oscillatory blood flow in diseased arteries in presence of magnetic fields

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Applied Mathematics and Mechanics(English Edition) 2012年第5期33卷 649-662页

作者： A.SINHA J.C.misra School of Medical Science and Technology Indian Institute of TechnologyKharagpur 721302India Department of Mathematics Institute of Technical Education and ResearchSiksha O Anusandhan UniversityBhubaneswar 751030India

A problem motivated by the investigation of the heat and mass transfer in the unsteady magnetohydrodynamic （MHD） flow of blood through a vessel is solved numerically when the lumen of the vessel has turned into the porous structure. The time-dependent permeability and the oscillatory suction velocity are considered. The computational results are presented graphically for the velocity, the temperature, and the concentration fields for various values of skin friction coefficients, Nusselt numbers, and Sherwood numbers. The study reveals that the flow is appreciably influenced by the presence of a magnetic field and also by the value of the Grashof number.

关键词： mass transfer radiation suction velocity skin-friction

Electro-osmotic flow of a second-grade fluid in a porous microchannel subject to an AC electric field

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Journal of Hydrodynamics 2013年第2期25卷 309-316页

作者： misra J. C. CHANDRA S. Department of Mathematics Institute of Technical Education and Research Siksha O Anusandhan University Department of Physics Sabang S. K. Mahavidyalaya Vidyasagar University

Studies on electro-osmotic flows of various types of fluids in microchannel are of great importance owing to their multifold applications in the transport of liquids, particularly when the ionized liquid flows with respect to a charged surface in the presence of an external electric field. In the case of viscoelastic fluids, the volumetric flow rate differs significantly from that of Newtonian fluids, even when the flow takes place under the same pressure gradient and the same electric field. With this end in view, this paper is devoted to a study concerning the flow pattern of an electro-osmotic flow in a porous microchannel, which is under the action of an alternating electric field. The influence of various rheological and electro-osmotic parameters, e.g., the Reynolds number, Debye-Huckel parameter, shape factor and fluid viscoelasticity on the kinematics of the fluid, has been investigated for a secondgrade viscoelastic fluid. The problem is first treated by using analytical methods, but the quantitative estimates are obtained numerically with the help of the software MATHEMATICA. The results presented here are applicable to the cases where the channel height is much greater than the thickness of the electrical double layer comprising the Stern and diffuse layers. The study reveals that a larger value of the Debye-Huckel parameter creates sharper profile near the wall and also that the velocity of electro-osmotic flow increases as the permeability of the porous microchannel is enhanced. The study further shows that the electro-osmotic flow dominates at lower values of Reynolds number. The results presented here will be quite useful to validate the observations of experimental investigations on the characteristics of electro-osmotic flows and also the results of complex numerical models that are necessary to deal with more realistic situations, where electro-osmotic flows come into the picture, as in blood flow in the micro-circulatory system subject to an elect

关键词： electrical double layer Debye length second-grade fluid Ionic energy

Nonlinear ion-acoustic solitary waves in an electron-positron-ion plasma with relativistic positron beam

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Chinese Physics B 2018年第10期27卷 471-476页

作者： Ridip Sarma Amar P misra Nirab C Adhikary Department of Mathematics University of Science and TechnologyTechno CityKhanaparaBaridua9th MileRi-BhoiMeghalayaIndia Department of Mathematics Siksha BhavanaVisva-Bharati University Physical Sciences Division Institute of Advanced Study in Science and TechnologyVigyan PathPaschim BoragaonGarchukGuwahati-781035AssamIndia

The propagation characteristics of nonlinear ion–acoustic（IA） solitary waves（SWs） are studied in thermal electron–positron–ion plasma considering the effect of relativistic positron beam. Starting from a set of fluid equations and using the reductive perturbation technique, we derive a Korteweg–de Vries（KdV） equation which governs the evolution of weakly nonlinear IA SWs in relativistic beam driven plasmas. The properties of the IA soliton are studied, and it is shown that the presence of relativistic positron beam significantly modifies the characteristics of IA solitons.

关键词： electron-positron-ion plasma relativistic effect ion-acoustic wave homogeneous balance method