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Does friction contribute to formability improvement using servo press?

Friction 2023年第5期11卷 820-835页

作者： Kali PRASAD Aishwary GUPTA Hariharan KRISHNASWAMY Uday CHAKKINGAL dilip K.BANERJEE Myoung-Gyu LEE Department of Mechanical Engineering Indian Institute of Technology MadrasChennai 600036India Department of Materials Science and Engineering Seoul National UniversitySeoul 08826Republic of Korea Department of Metallurgical and Materials Engineering Indian Institute of Technology MadrasChennai 600036India Material Measurement Laboratory National Institute of Standards and Technology(NIST)Gaithersburg 20899USA

Servo press forming machines are advanced forming systems that are capable of imparting interrupted punch motion,resulting in enhanced room temperature *** exact mechanism of the formability improvement is not yet *** contribution of interrupted motion in the ductility improvement has been studied through stress relaxation phenomena in uniaxial tensile(UT)***,the reason for improved formability observed when employing servo press is complicated due to the additional contribution from frictional *** the present work,an attempt is made to decouple the friction effect on formability improvement *** improved formability is studied using a hole expansion test(HET).The limit of forming during hole expansion is modeled using the Hosford–Coulomb(HC)damage criteria,which is implemented as a user subroutine in a commercial explicit finite element(FE)*** the contribution of stress relaxation is accounted for in the evolution of the damage variable during interrupted ***,the difference between simulation and experimental hole expansion ratio(HER)can be used to decouple the friction effect from the overall formability improvement during hole *** improvement in HER due to stress relaxation and friction effect is *** study showed that the model effectively captures the hole expansion deformation process in both monotonic and interrupted loading *** to stress relaxation,friction effect played a major role during interrupted HET.

关键词： servo press hole expansion test(HET) dual phase steel finite element(FE)analysis Hosford-Coulomb(HC)ductile fracture model

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Sugar Derivatives of Morphine:A New Window for the Development of Potent Anesthetic Drugs

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Natural Products and Bioprospecting 2015年第3期5卷 111-127页

作者： Shyamal K.Jash dilip Gorai Department of Chemistry Saldiha College(Affiliated to the University of Burdwan)SaldihaBankura 722173West BengalIndia Department of Chemistry Kulti College(Affiliated to the University of Burdwan)KultiBurdwan 713343West BengalIndia

This review provides a short account of carbohydrate derivatives of an important natural drug,morphine,along with their comparative efficacies as anesthetic *** derivatives are found to have more prospect as anesthetic drug than morphine itself owing to their enhanced *** schemes of these sugar derivatives and information on related patents are also included in this manuscript.

关键词： Morphine Morphine glycosides Synthesis Bioavailability Anesthetic agents Related patents

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Zero covariation returns

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Probability, Uncertainty and Quantitative Risk 2018年第1期3卷 146-174页

作者： dilip B.Madan Wim Schoutens Robert H.Smith School of Business University of MarylandCollege Park 20742MDUSA Department of Mathematics K.U.LeuvenLeuvenBelgium

Asset returns are modeled by locally bilateral gamma processes with zero *** are then observed to be consequences of randomness in *** vector machine regressions on prices are employed to model the implied *** contributions of support vector machine regressions are evaluated using reductions in the economic cost of exposure to prediction *** local and global mean reversion and momentum are represented by drift dependence on price *** portfolios maximize conservative portfolio val-ues calculated as distorted expectations of portfolio returns observed on simulated path *** are also shown to outperform classical alternatives.

关键词： Bilateral gammaprocess Minmaxvardistortion Conic portfolio theory Distorted expectation

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Thermo-electronic solar power conversion with a parabolic concentrator

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Journal of Semiconductors 2016年第2期37卷 57-65页

作者： Olawole C.Olukunle dilip K.De Physics Department Covenant University OtaNigeria

We consider the energy dynamics of the power generation from the sun when the solar energy is con- centrated on to the emitter ofa thermo-electronic converter with the help of a parabolic mirror. We use the modified Richardson-Dushman equation. The emitter cross section is assumed to be exactly equal to the focused area at a height h from the base of the mirror to prevent loss of efficiency. We report the variation of output power with solar insolation, height h, reflectivity of the mirror, and anode temperature, initially assuming that there is no space charge effect. Our methodology allows us to predict the temperature at which the anode must be cooled in order to prevent loss of efficiency of power conversion. Novel ways of tackling the space charge problem have been discussed. The space charge effect is modeled through the introduction of a parameter f （0 〈 f 〈 1） in the thermos-electron emission equation. We find that the efficiency of the power conversion depends on solar insolation, height h, apart from radii R of the concentrator aperture and emitter, and the collector material properties. We have also considered solar thermos electronic power conversion by using single atom-layer graphene as an emitter.

关键词： thermos electronic power conversion solar parabolic concentrator modified thermionic equation space charge magnetic field anode temperature

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Abundance and habitat-suitability relationship deteriorate in fragmented forest landscapes:a case of Adinandra griffithii Dyer,a threatened endemic tree from Meghalaya in northeast India

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Ecological Processes 2018年第1期7卷 23-31页

作者： Dibyendu Adhikari Aabid Hussain Mir Krishna Upadhaya Viheno Iralu dilip Kumar Roy Department of Botany North-Eastern Hill UniversityShillong 793022India Department of Environmental Studies North-Eastern Hill UniversityShillong 793022India Department of Basic Sciences and Social Sciences North-Eastern Hill UniversityShillong 793022India Botanical Survey of India Eastern Regional CentreShillong 793003India

Introduction:A strong positive‘abundance and habitat-suitability’relationship is crucial for conservation of ***,anthropogenic alteration of natural landscapes leading to land use and land cover change,habitat loss,and species extinctions(may)have putatively disturbed this ***,it is important to study the nature of the relationship in such human influenced ***:In this study,we endeavored to understand the consistency of the relationship in the fragmented natural landscapes in the Khasi,Garo,and Jaintia hills of Meghalaya in northeast India,with Adinandra griffithii(an endangered endemic tree)as a model *** reconstructed the distribution of its suitable habitats as a function of the remotely sensed vegetation phenology(i.e.,EVI data),using point occurrence data and ecological niche modeling(ENM)*** of the abundance and habitat characterization was done through field surveys following standard ***:The study revealed that remotely sensed landscape-level vegetation phenology could effectively discriminate the suitable and unsuitable habitats of threatened *** regression model showed a weak positive correlation between abundance and predicted habitat suitability for adult trees indicating(plausible)deterioration in the ***,sapling and seedling populations did not show a precise trend in this ***-based studies revealed that removal of the species from the suitable habitats because of anthropogenic disturbances possibly weakened the abundance-suitability ***:The findings of the study enjoin the need for re-establishment of the species in the suitable areas for its conservation and perpetuation.

关键词： Abundant-center hypothesis Species abundance Habitat suitability EVI ENM

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Portfolio theory for squared returns correlated across time

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Probability, Uncertainty and Quantitative Risk 2016年第1期1卷 1-36页

作者： Ernst Eberlein dilip B.Madan University of Freiburg Freiburg im BreisgauGermany University of Maryland College ParkUSA

Allowing for correlated squared returns across two consecutive periods,portfolio theory for two periods is *** correlation makes it necessary to work with non-Gaussian *** two-period conic portfolio problem is formulated and *** development leads to a mean ask price frontier,where the latter employs concave *** modeling permits access to skewness via randomized *** portfolios maximize a conservative market value seen as a bid price for the *** the mean ask price frontier we observe a tradeoff between the deterministic and random drifts and the volatility costs of increasing the deterministic *** a historical perspective,we also implement a mean-variance *** resulting mean-variance frontier is three-dimensional expressing the minimal variance as a function of the targeted levels for the deterministic and random drift.

关键词： frontier theory variance

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Hepatoprotective effect of Averrhoea carambola fruit extract on carbon tetrachloride induced hepatotoxicity in mice

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Asian Pacific Journal of Tropical Medicine 2010年第8期3卷 610-613页

作者： A.K.Azeem Molly Mathew Chandraniohan Nair dilip.C Al Shifa College of Pharmacy Poonthavanam P.OKizhatturPerinlhalmannaMalappuram DistKerala.India 679329 Malik Deenar College of Pharmacy KasaragodKerala Al Shifa College of Pharmacy Poonlhavaimm P.O.KizhatlurPerinthalmannaMalappuram DistKerala.India 679329

Objective:To investigate the hepatoprotective activity of Averroha carambola fruit extract against carbon tetrachloride induced hepatic ***:Hepatotoxicity was induced on albino mice by intraperitoneal administration of CCl4.half an hour after the administration of the last dose of the extract of Averroha carambola *** extract of the fruit of Averroha carambola was administered at a dose of 0.9 g/kg body weight once daily for seven *** hepatic injury and its prevention was assessed by the estimation of serum activities of alanine aminotransferase（ALT）,aspartate aminotransferase（AST）,alkaline phosphates（ALP）,glutathione level and histopathological studies of ***:Pre-treatment of mice with the fruit extract of Averrhoea carambola significantly reduced serum levels of ALT,AST and ALP enzyme and significantly increased the liver reduced glutathione levels 24 h after the administration of carbon tetrachloride.A marked improvement in the enzyme activities and the liver reduced glulathione level was observed in the pre-treated mice 4 days after the administration of carbon tetrachloride. Histopathological studies provided supportive evidence for the biochemical analvsis. Conclusions:The aqueous extract of the fruit of Averrhoea carambola has hepatoprotective effect against carbon tetrachloride induced liver damage in mice.

关键词： Averroha carambola Aqueous extract Hepatoprotective activity Carbon tetrachloride

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Hemophagocytic lymphohistiocytosis:critical reappraisal of a potentially under-recognized condition

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Frontiers of Medicine 2013年第4期7卷 492-498页

作者： Somanath Padhi Renu G’Boy Varghese Anita Ramdas Manjiri dilip Phansalkar RajLaxmi Sarangi Department of Pathology Pondicherry Institute of Medical SciencesGanapathichettykulamKalapetPuducherry 605014India Department of Biochemistry Pondicherry Institute of Medical SciencesGanapathichettykulamKalapetPuducherry 605014India

Hemophagocytic lymphohistiocytosis(HLH)is an uncommon,potentially life threatening,hyper inflammatory syndrome of diverse *** signs include prolonged fever,organomegaly,and persistent unexplained *** spite of the well known diagnostic criteria put forth by HLH society,this continues to pose great diagnostic challenge in both pediatric and adult intensive care *** describe 4 adult(2 males,2 females,aged 19,29,40,and 17 years)and 3 pediatric(2 males,1female,aged 1 month,6 months,and 12 years)patients with secondary HLH who satisfied the HLH-2004 diagnostic *** evidence of hemophagocytosis was noted in 4 patients on initial bone marrow *** underlying etiologies were as follows:Rickettsia tsutsugamushi(case 1),autoimmune disorder(case 2),systemic onset juvenile idiopathic arthritis(sJIA)(case 3),unknown bite(possibly a venomous snake)(case 4),Plasmodium vivax(case 5),Cytomegalo virus(case 6),and Mycobacterium tuberculosis(case 7).In one patient,hemophagocytosis was presumed to have been exacerbated by administration of granulocyte monocyte colony stimulating factor(GM-CSF)for severe *** patients died with disseminated intravascular coagulation(DIC)and multi organ failure within few days of HLH *** therapy was started in 3 patients,and etoposide was started in one patient *** to lack of specificity of diagnostic criteria,diagnosing and differentiating HLH from its closest mimickers like sepsis/septic shock may be quite challenging in critically ill ***,increasing awareness among physicians is essential for early diagnosis and effective therapy to reduce the mortality.

关键词： hemophagocytic lymphohistiocytosis diagnosis therapy GM-CSF bone marrow

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Sources and dynamics of sedimentary organic matter in Sundarban mangrove estuary from Indo-Gangetic delta

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Ecological Processes 2017年第1期6卷 69-83页

作者： M.Bala Krishna Prasad Alok Kumar A.L.Ramanathan dilip Kumar Datta 22616 Shining Harness Street ClarksburgMD 20871USA School of Environmental Sciences Jawaharlal Nehru UniversityNew Delhi 110067India Environmental Science Discipline Khulna UniversityKhulna 9208Bangladesh

Introduction:Mangrove forests are highly productive ecosystems distributed along the tropical coast *** biogeochemistry of mangroves are primarly driven by both allochthonous and autochthonous *** of organic matter in coastal ecosystems enables to understand the biogeochemical transformation of organic matter and its influence on ecosystem productivity in response to various changing environmental ***,the elemental and stable carbon and nitrogen levels were employed to understand the organic matter(OM)dynamics in the Sundarban mangrove ecosystem(India-Bangladesh).Results:Differences in stable isotope values indicate that variable sources influence the OM dynamics in Sundarban *** progressive enrichment inδ13C levels along the land-coastal continuum indicates that the terrestrial and marine inputs are dominant at the landward and seaward ends,*** CuO oxidationderived lignin phenol monomers describe significant levels of total lignin are preserved in Sundarban mangrove sediments during *** phenol monomer ratios are lower than the plant litter explaining that aromatic ring cleavage is the dominant mechanism for the lignin ***,the Ad/Al ratios were higher than the plant litter explaining the oxidation of propyl side chain of vascular OM influencing the carbon cycling in Sundarban ***,the Ad/Al ratios describe the vascular OM degradation is through the oxidation of propyl side ***:The regional variability in land-use regulates the spatial variability in C,N,OC/TN ratio,δ13C andδ15N between the Indian and the Bangladesh Sundarban mangroves and indicates that in the upstream terrestrial organic matter and/or mangrove plant litter contribute significant amount of organic matter,whereas the marine POC influences the organic matter dynamics in *** three end-member mixing model applying terrestrial plant litter,seston,and marine POC as e

关键词： Sundarban mangrove Organic carbon Stable isotopes Lignin phenols Three end-member mixing model

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Now decision theory

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Probability, Uncertainty and Quantitative Risk 2023年第3期8卷 391-416页

作者： dilip B.Madan Wim Schoutens King Wang Robert H.Smith School of Business University of MarylandCollege ParkMD.20742USA Department of Mathematics K.U.LeuvenLeuven3000 LeuvenBelgium Derivative Product Strats Morgan Stanley1585 Broadway5th floorNew YorkNY 10036USA

The spirit of now in nowcasting suggests expanding the current to include the near *** theory is then developed by incorporating the consequences of actions into the *** the future falling into the present discounting it is no longer *** functions are then observed to be determinate only up to scale and shift that are then locked down by fixing values arbitrarily in two selected states,much like declaring water to freeze and boil at zero and a hundred degrees *** locked down value functions associated policy functions are seen to exist in decision contexts in where the only time is *** are studied in univariate and multivariate dimensions for the decision state space and the dimension of shocks delivering state *** policy functions are expanded from realisitic training sets to the full state space using Gaussian Process *** are implemented on real data with reported performances.

关键词： State dependent discounting Bilateral gamma process Probability distortion Measure distortion Gamma discounted averaging Multivariate bilateral gamma model

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