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Shock Induced Symmetric Compression in a Spherical Target

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Journal of Modern Physics 2015年第13期6卷 1769-1775页

作者： labakanta mandal Sourav Roy Manoranjan Khan R. Roychoudhury Department of Physics Budge Budge Institute of Technology Kolkata India Department of Instrumentation Science Jadavpur University Kolkata India Advanced Centre for Nonlinear and Complex Phenomena Kolkata India

Shock induced symmetric compression has been studied in a spherical target. The shock induced interfacial radius will shrink and would reach a minimum point during implosion situation. However, after implosion the plasma tries to expand in blow off/explosion situation and as a result the interfacial radius will increase. Effects of plasma parameters like density and temperature have been studied numerically. It is seen that the density increases many times due to the mass conservation in imploding situation of a compressible shell like ICF. However, temperature will change rapidly due to change of inner density and so would be the pressure of compressible fluid following adiabatic law. Our analytical results agree qualitatively with those of simulation results in spherical geometry and also experimental observations conducted in cylindrical container.

关键词： Two Fluid Interface Instability Shock Impingement Adiabatic Symmetric Compression Implosion

Spiky Development at the Interface in Rayleigh-Taylor Instability: Layzer Approximation with Second Harmonic

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Journal of Modern Physics 2013年第2期4卷 174-179页

作者： Rahul Banerjee labakanta mandal Manoranjan Khan Mithil Ranjan Gupta Department of Instrumentation Science Centre for Plasma Studies Jadavpur University Kolkata India

Layzer’s approximation method for investigation of two fluid interface structures associated with Rayleigh Taylor instability for arbitrary Atwood number is extended with the inclusion of second harmonic mode leaving out the zeroth harmonic one. The modification makes the fluid velocities vanish at infinity and leads to avoidance of the need to make the unphysical assumption of the existence of a time dependent source at infinity. The present analysis shows that for an initial interface perturbation with curvature exceeding , where A is the Atwood number there occurs an almost free fall of the spike with continuously increasing sharpening as it falls. The curvature at the tip of the spike also increases with Atwood number. Certain initial condition may also result in occurrence of finite time singularity as found in case of conformal mapping technique used earlier. However bubble growth rate is not appreciably affected.

关键词： Rayleigh Taylor Instability Bubble Spike ICF Supernova

Applying deep learning and benchmark machine learning algorithms for landslide susceptibility modelling in Rorachu river basin of Sikkim Himalaya, India

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Geoscience Frontiers 2021年第5期12卷 264-280页

作者： Kanu mandal Sunil Saha Sujit mandal Department of Geography University of Gour BangaMalda 732103West BengalIndia Department of Geography Diamond Harbour Woman’s UniversityDiamond HarbourWest BengalIndia

Landslide is considered as one of the most severe threats to human life and property in the hilly areas of the *** number of landslides and the level of damage across the globe has been increasing over ***,landslide management is essential to maintain the natural and socio-economic dynamics of the hilly *** river basin is one of the most landslide-prone areas of the Sikkim selected for the present *** prime goal of the study is to prepare landslide susceptibility maps(LSMs)using computer-based advanced machine learning techniques and compare the performance of the *** properly understand the existing spatial relation with the landslide,twenty factors,including triggering and causative factors,were selected.A deep learning algorithm *** neural network model(CNN)and three popular machine learning techniques,i.e.,random forest model(RF),artificial neural network model(ANN),and bagging model,were employed to prepare the *** separate datasets including training and validation were designed by randomly taken landslide and nonlandslide points.A ratio of 70:30 was considered for the selection of both training and validation *** was assessed by tolerance and variance inflation factor,and the role of individual conditioning factors was estimated using information gain *** result reveals that there is no severe multicollinearity among the landslide conditioning factors,and the triggering factor rainfall appeared as the leading cause of the *** on the final prediction values of each model,LSM was constructed and successfully portioned into five distinct classes,like very low,low,moderate,high,and very high *** susceptibility class-wise distribution of landslides shows that more than 90%of the landslide area falls under higher landslide susceptibility *** precision of models was examined using the area under the curve(AUC)of the receiver operating characteristi

关键词： Machine learning techniques Information gain ratio(IGR) Landslide susceptibility map(LSM) Convolutional neural network(CNN) Receiver operating characteristics(ROC)

Novel phosphonated polymer without anhydride formation for proton exchange membrane fuel cells

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Journal of Energy Chemistry 2022年第2期31卷 469-471页

作者： Mrinmay mandal School of Chemical and Biomolecular Engineering Georgia Institute of TechnologyAtlantaGA 30332-0100USA

Proton exchange membrane fuel cells(PEMFCs)are regarded as one of the most promising clean energy technology because of their high energy density,silent emission-free operation,and wide applications[1].Recently,anion ... 详细信息

关键词： Phosphonated polymers Proton exchange membrane Membrane electrode assembly Fuel cell Durability

Ward identities under the frame transformations in curved space-time

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Communications in Theoretical Physics 2024年第9期76卷 107-117页

作者： Susobhan mandal Department of Physics Indian Institute of Technology BombayMumbai 400076India

Scalar-tensor theories of gravity are considered to be competitors to Einstein's theory of general relativity for the description of classical gravity,as they are used to build feasible models for cosmic *** theories can be formulated both in the Jordan and Einstein frame,which are related by a Weyl transformation with a field transformation,known together as a frame *** theories formulated in the above two frames are often considered to be equivalent from the point of view of classical ***,this is no longer true from the quantum field theoretical *** the present article,we show that the Ward identities derived in the above two frames are not connected through the frame *** shows that the quantum field theories formulated in these two frames are not equivalent to each ***,this inequivalence is also shown by comparing the effective actions derived in these two frames.

关键词： ward identities frame transformations curved spacetime

A comprehensive review on biocompatible Mg-based alloys as temporary orthopaedic implants:Current status,challenges,and future prospects

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Journal of Magnesium and Alloys 2022年第3期10卷 674-722页

作者： Darothi Bairagi Sumantra mandal Department of Metallurgical and Materials Engineering Indian Institute of TechnologyKharagpur 721302India

Mg and its alloys are drawing huge attention since the last two decades as a viable option for temporary implants applications.A commendable progress has already been made in the development of these *** biodegradable nature of Mg,appreciable biocompatibility of elemental Mg,and its close resemblance to natural bone in terms of density and elastic modulus make them highly preferable option amongst other available alternatives in this *** review article presents an overview covering the recent advancements made in the field of Mg-based biodegradable implants for orthopaedic implant *** paper focuses on alloy development and fabrication techniques,the state of the art of important Mg-based alloy systems in terms of their mechanical properties,in-vitro and in-vivo degradation behaviour and ***,the paper reviews the current progress achieved in the clinical transition of Mg-based alloys for orthopaedic *** review also includes the degradation mechanisms of the alloys in physiological environment and highlights the mismatch existing between the rate of bone healing and alloy degradation due to rapid corrosion of the alloys in such environment,which has still restricted their widespread ***,the surface coating techniques available for the alloys as an effective way to reduce the degradation rate are reviewed,followed by a discussion on the future research prospects.

关键词： Mg-based alloys Biomaterials Temporary implants Biocompatibility Degradation behaviour orthopaedic fixtures.

Enhanced in-vitro degradation resistance and cytocompatibility of a thermomechanically processed novel Mg alloy:Insights into the role of microstructural attributes

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Journal of Magnesium and Alloys 2024年第2期12卷 700-725页

作者： Darothi Bairagi Santanu mandal Mangal Roy Manas Paliwal Sumantra mandal Department of Metallurgical and Materials Engineering Indian Institute of TechnologyKharagpur 721302India

The role of microstructural features on in-vitro degradation and surface film development of a thermomechanically processed Mg-4Zn-0.5Ca-0.8Mn alloy has been investigated employing electrochemical studies,scanning electron microscopy and X-ray photoelectron *** specimen forged at 523 K temperature developed a coarse unimodal microstructure consisting of basal oriented grains,whereas the specimens forged at 623 K and 723 K temperatures exhibited bimodal microstructures containing randomly oriented fine grains and basal oriented coarse *** bimodal microstructures exerted higher resistance to corrosion compared to the unimodal microstructure in presence of a protective surface *** optimum size distribution of fine and coarse grains as well as the prevalence of basal oriented grains led to the lowest anodic current density in the specimen forged at 623 *** morphology of Ca_(2)Mg_(6)Zn_(3)precipitates governed the cathodic kinetics by controlling the anode to cathode surface area *** the specimen forged at 723 K comprised comparatively lower fraction of precipitates than at 623 K,the mesh-like precipitate morphology increased the effective cathodic surface area,leading to enhanced localised corrosion in the former *** microstructural features developed at 623 K forging temperature formed a well-protective surface film with lower Mg(OH)_(2)to MgO ratio,exhibiting distinctly high polarization resistance and superior cytocompatibility in terms of cell-proliferation and cell-differentiation.

关键词： Magnesium alloy Microstructure Corrosion Electrochemical impedance spectroscopy X-ray photoelectron spectroscopy Cytotoxicity

Human cystic echinococcosis:epidemiologic,zoonotic,clinical,diagnostic and therapeutic aspects

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Asian Pacific Journal of Tropical Medicine 2012年第4期5卷 253-260页

作者： Shyamapada mandal Manisha Deb mandal Department of Zoology Gurudas CollegeNarkeldanga.Kolkata-700054.India Department of Physiology and Biophysics KPC Medical College and HospitalJadavpurKolkata-700032India

This review represents an updated scenario on the transmission cycle,epidemiology,clinical features and pathogenicity,diagnosis and treatment,and prevention and control measures of a cestode parasite Echincoccus granulosus(***) infection causing cystic echinococcosis (CE) in *** CE is a serious life-threatening neglected zoonotic disease that occurs in both developing and developed countries,and is recognized as a major public health problem. The life cycle of *** involves a definitive host(dogs and other canids) for the adult *** that resides in the intestine,and an intermediate host(sheep and other herbivores) for the tissue-invading metacestode(larval) *** are only incidentally infected;since the completion of the life cycle of *** depends on carnivores feeding on herbivores bearing hydatid cysts with viable protoscoleces,humans represent usually the dead end for the *** ingestion of *** eggs,hydatid cysts are formed mostly in liver and lungs, and occasionally in other organs of human body,which are considered as uncommon sites of localization of hydatid *** diagnosis of extrahepatic echinococcal disease is more accurate today because of the availability of new imaging techniques,and the current treatments include surgery and percutaneous drainage,and chemotherapy(albendazole and mebendazole).*** wild animals that involve in sylvatic cycle may overlap and interact with the domestic sheepdog cycle,and thus complicating the control *** updated facts and phenomena regarding human and animal CE presented herein are due to the web search of SCI and non-SCI journals.

关键词： Human cystic echinococcosis Zoonotic disease Epidemiology Echincoccus granulosus Hydatid cyst Surgery Chemotherapy

Strength Characteristics of Treated Soil with Proposed Layer Formation

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Journal of Wuhan University of Technology(Materials Science) 2023年第1期38卷 117-135页

作者： N Sivakumar A mandal Srinivasan venkatraman Department of Civil Engineering Visvesvaraya National Institute of TechnologyNagpur-440010India

The engineering characteristics of the soil,soil-fly ash and fly ash-lime,were examined to utilize as base layer material in civil *** influence of fly ash percentage and the effect of curing on California bearing ratio(CBR)and unconfined compressive strength(UCS),of soil and soil-fly ash mixing and layered system were examined to estimate the optimum *** volumetric swelling of the optimal mixture was estimated to be within the allowable *** microscope analysis and X-ray diffraction tests were performed.A model test analyses with three layers were conducted by finite element method and stress-strain behavior was observed.

关键词： Scanning electron microscopy simulation sustainable materials waste reduction X-ray diffraction