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Transfer Matrix Approach for Two-State Scattering Problem with Arbitrary Coupling

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Chinese Physics Letters 2015年第7期32卷 5-8页

作者： Diwaker Aniruddha chakraborty School of Basic Sciences Indian Institute of Technology Mandi

The present work deals with the calculation of transition probability between two diabatic potentials coupled by any arbitrary coupling. The method presented in this work is applicable to any type of coupling while for numerical calculations we have assumed the arbitrary coupling as Gaussian coupling. This arbitrary coupling is expressed as a collection of Dirac delta functions and by the use of the transfer matrix technique the transition probability from one diabatic potential to another diabatic potential is calculated. We examine our approach by considering the case of two constant potentials coupled by Gaussian coupling as an arbitrary coupling.

关键词： Transfer Matrix Approach for Two-State Scattering Problem with Arbitrary Coupling

Syn-sedimentary tectonics and facies analysis in a rift setting: Cretaceous Dalmiapuram Formation, Cauvery Basin, SE India

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Journal of Palaeogeography 2018年第2期7卷 146-167页

作者： Nivedita chakraborty Subir Sarkar Department of Geology Kabi Jagadram Roy Govt. General Degree College Department of Geological Sciences Jadavpur University

The Cretaceous(Albian-Cenomanian) Dalmiapuram Formation is one of the economically significant constituents in the hydrocarbon-producing Cauvery rift basin, SE India that opened up during the Late Jurassic e Early Cretaceous Gondwanaland fragmentation. The fossil-rich Dalmiapuram Formation,exposed at Ariyalur within the Pondicherry sub-basin of Cauvery Basin, rests in most places directly on the Archean basement and locally on the Lower Cretaceous(Barremian-Aptian) Basal Siliciclastic Formation. In the Dalmiapuram Formation, a facies association of tectonically-disturbed phase is sandwiched between two drastically quieter phases. The early syn-rift facies association(FA 1), records the first carbonate marine transgression within the basin, comprising a bar-lagoon system with occasionally storms affecting along the shore and a sheet-like non-recurrent biomicritic limestone bed on the shallow shelf that laterally grades into pyrite e glauconite-bearing dark-colored shale in the deeper shelf. Spectacular breccias together with varied kinds of mass-flow products comprise the syn-rift facies association(FA 2). While the breccias occur at the basin margin area, the latter extend in the deeper inland sea. Clast composition of the coarse clastics includes large, even block-sized limestone fragments and small fragments of granite and sandstone from the *** beds of quieter intervals between tectonic pulses occur in alternation with them. Faulted basal contact of the formation, and small grabens filled by multiple mass-flow packages bear the clear signature of the syntectonic activity localized contortions, slump folds, and pillow beds associated with mega slump/slide planes and joints, which corroborates this contention further. This phase of tectonic intervention is followed by another relatively quieter phase and accommodates the late syn-rift facies association(FA 3). A tidal bar-interbar shelf depositional system allowed a transgressive systems tract motif to gr

关键词： Syn-sedimentary tectonics Facies analysis Carbonate shelf Cretaceous Dalmiapuram Formation Cauvery Basin

Phenolic Profile,Antioxidant,Antihyperlipidemic and Cardiac Risk Preventive Effect of Pigmented Black Rice Variety Chakhao poireiton in High-Fat High-Sugar Induced Rats

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水稻科学:英文版 2023年第6期30卷 641-651页

作者： Raja chakraborty Pratap KALITA Saikat SEN Faculty of Pharmaceutical Science Assam down town UniversityAssam 781026India Institute of Pharmacy Assam Don Bosco UniversityAssam 782402India Pratiksha Institute of Pharmaceutical Sciences GuwahatiAssam 781026India

The present study aimed to investigate the hypolipidemic,antioxidant and cardiac risk-suppressing effects of Chakhao poireiton(CP),a GI-tagged pigmented black rice from *** vitro and ex vivo studies confirmed that whole rice extracts of CP have potent antioxidant,3-hydroxy-3-methylglutaryl-CoA reductase,cholesterol esterase inhibitory,and antilipase *** in vivo study was conducted to evaluate the effects of the ethanol extracts of CP on high-fat high-sugar induced hyperlipidemic *** ethanol extract significantly ameliorated lipid parameters and liver enzymes to *** of lactate dehydrogenase,creatine kinase-N-acetyl cysteine,C-reactive protein,and lipoprotein a were significantly lower in the extract-treated groups than those in the disease control group.A marked reduction of ApoB/ApoA1 and other atherogenic indices were observed in extract-treated *** phenolic compounds,*** acid,gallic acid,protocatechuic acid etc.,were quantified in *** study provided the first evidence of the antihyperlipidemic and cardiac risk inhibitory effects of CP,which would be beneficial in preventing and managing hyperlipidemia,associated oxidative stress,and cardiac complications.

关键词： antioxidant cardiac risk high fat high sugar hypolipidemic phenolic compound pigmented rice whole rice

Using Statistical Modeling,Rate of Change of Pitch and Inter-Onset Interval to Distinguish Between Restful and Restless Ragas

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Communications in Mathematics and Statistics 2017年第2期5卷 199-212页

作者： Poonam Priyadarshini Soubhik chakraborty Department of Electronics and Communication Engineering Birla Institute of TechnologyPatna CampusPatnaIndia Department of Mathematics Birla Institute of TechnologyMesraRanchiIndia

Given that the strength of statistics lies in modelling,we are motivated to do a comparative statistical study between two types of ragas,one being aesthetically known to be restful and the other restless in *** first try to distinguish these two types through statistical *** substantiate our findings,two more sta-tistical features are considered in the paper to separate the two categories of ragas,namely the rate of change of pitch and inter-onset *** experimental results are encouraging.

关键词： Raga {Restful,restless}nature Rate of pitch change Inter Onset interval Statistical modeling

Restoration of dysregulated CC chemokine signaling for monocyte/macrophage chemotaxis in head and neck squamous cell carcinoma patients by neem leaf glycoprotein maximizes tumor cell cytotoxicity

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Cellular & Molecular Immunology 2010年第5期7卷 396-408页

作者： Krishnendu chakraborty Anamika Bose Tathagata chakraborty Koustav Sarkar Shyamal Goswami Smarajit Pal Rathindranath Baral Department of Immunoregulation and Immunodiagnostics Chittaranjan National Cancer InstituteKolkataIndia Unit of Clinical Biochemistry Chittaranjan National Cancer InstituteKolkataIndia

Previous studies have shown that the CC chemokine receptor CCR5 is downregulated on monocyte/macrophage(MO/Mw)surfaces in head and neck squamous cell carcinoma(HNSCC)patients(stage IIIB).Ligands(RANTES,MIP-1a and MIP-1b)of this chemokine receptor were also secreted in lesser quantity from MO/Mw of HNSCC patients in comparison with healthy *** an aim to restore this dysregulated receptor–ligand signaling,we have used neem leaf glycoprotein(NLGP),a novel immunomodulator reported from our *** upregulated CCR5 expression,as evidenced from studies on MO/Mw of peripheral blood from HNSCC patients as well as healthy *** of RANTES,MIP-1a and MIP-1b was also upregulated following NLGP treatment of these cells in ***,NLGP has little effect on the expression of CCR5 and the ligand RANTES in oral cancer *** restored CCR5 receptor–ligand signaling seen in MO/Mw was reflected in improved CCR5-dependent,p38 mitogen-activated protein kinase(MAPK)-mediated migration of MO/Mw after NLGP treatment to a standard *** also induces better antigen presentation and simultaneous costimulation to effector T cells by MO/Mw by upregulating human leucocyte antigen(HLA)-ABC,CD80 and *** addition,NLGP-treated MO/Mw-primed T cells can effectively lyse tumor cells in *** effects of NLGP on monocyte migration and T cell-mediated oral tumor cell killing were further demonstrated in transwell assays with or without CCR5 *** results suggest a new approach in cancer immunotherapy by modulating dysregulated CCR5 signals from MO/Mw.

关键词： CCR5 chemokine head and neck squamous cell carcinoma monocytes neem leaf glycoprotein

An integrated deterministic-stochastic approach for forecasting the long-term trajectories of COVID-19

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International Journal of Modeling, Simulation, and Scientific Computing 2021年第3期12卷 63-75页

作者： Indrajit Ghosh Tanujit chakraborty Indian Statistical Institute 203 B.T.Road BaranagarKolkata 700108India

The ongoing coronavirus disease 2019(COVID-19)pandemic is one of the major health emergencies in decades that affected almost every country in the *** of June 30,2020,it has caused an outbreak with more than 10 million confirmed infections,and more than 500,000 reported deaths *** to the unavailability of an effective treatment(or vaccine)and insufficient evidence regarding the transmission mechanism of the epidemic,the world population is currently in a vulnerable *** daily cases data sets of COVID-19 for profoundly affected countries represent a stochastic process comprised of deterministic and stochastic *** study proposes an integrated deterministic–stochastic approach to forecast the long-term trajectories of the COVID-19 cases for Italy and *** deterministic component of the daily-cases univariate time series is assessed by an extended version of the SIR[Susceptible–Infected–Recovered–Protected–Isolated(SIRCX)]model,whereas its stochastic component is modeled using an autoregressive(AR)time series *** proposed integrated SIRCX-AR(ISA)approach based on two operationally distinct modeling paradigms utilizes the superiority of both the deterministic SIRCX and stochastic AR models to find the long-term trajectories of the epidemic *** analysis based on the proposed ISA model shows significant improvement in the long-term forecasting of COVID-19 cases for Italy and Spain in comparison to the ODE-based SIRCX *** estimated Basic reproduction numbers for Italy and Spain based on SIRCX model are found to be 4.78 and 3.25,*** model-based results reveal that the number of cases in Italy and Spain between 11 May,2020–9 June,2020 will be 10,982(6383–15,582)and 13,731(3395–29,013),***,the expected number of daily cases on 9 July,2020 for Italy and Spain is estimated to be 30(0–183)and 92(0–602),respectively.

关键词： COVID-19 Integrated approach Prediction Extended SIR model AR model

Rhinofacial conidiobolomycosis in an immunocompetent 30-year-old male:A case report

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Asian Pacific Journal of Tropical Medicine 2023年第7期16卷 329-331,I0001页

作者： Sourav Kundu Sambudhya chakraborty Department of Tropical Medicine School of Tropical MedicineKolkataWest BengalIndia

Rationale:Fungal rhinosinusitis is a rare entity in immunocompetent patients and is a diagnostic *** is a rare cause of fungal rhinosinusitis which happens to affect immunocompetent *** concerns:A 30-year-old male patient complained of painless progressive swelling of nose for 5 years and painless progressive swelling of upper lip for 4 years associated with nasal obstruction for 5 ***:Rhinofacial ***:Systemic anti-fungals and saturated solution of potassium ***:Swelling initially reduced but again increased eventually as he discontinued ***:Proper adherence to drugs and need for facial reconstructive surgery may need to be considered in such cases of conidiobolomycosis.

关键词： Conidiobolomycosis Fungus Rhinosinusitis Tropical Rhino facial Entomophthoramycosis

A brief survey of computerized expert systems for crop protection being used in India

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Progress in Natural Science:Materials International 2008年第4期18卷 469-473页

作者： Pinaki chakraborty Dilip Kumar Chakrabarti School of Computer and Systems Sciences Jawaharlal Nehru University Department of Horticulture Narendra Dev University of Agriculture and Technology

In the recent years, a plethora of computerized expert systems has been developed for various sectors of agriculture in India. The availability of low-cost computers, agricultural knowledge and information technology professionals are the principal reasons for the development of so many agricultural expert systems. Among all agricultural expert systems, the expert systems for crop protection need special mention. These expert systems are meant to be used by farmers and other persons without much experience of using computers. Hence, special care must be taken while developing them. The current paper develops a taxonomy for the expert systems for crop pro- tection and briefly discusses four such expert systems for crop protection being used in India.

关键词： Computerized expert system Agriculture Agricultural expert system Crop protection

Scattering of water waves by thick rectangular barriers in presence of ice cover

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Journal of Ocean Engineering and Science 2020年第3期5卷 279-293页

作者： Anushree Samanta Rumpa chakraborty Department of Mathematics Jadavpur UniversityKolkata-700032India Department of Mathematics Diamond Harbour Women’s UniversitySouth 24 Parganas-743368India

Assuming linear theory,the two dimensional problem of water wave scattering past thick rectangular barrier in presence of thin ice cover,is investigated *** four types of thick barriers are considered here and also the ice cover is taken as a thin elastic *** be the barrier is partially immersed or bottom standing or fully submerged in water or in the form of thick rectangular wall with a submerged gap presence in *** problem is formulated in terms of a first kind integral equation by considering the symmetric and antisymmetric parts of velocity potential *** integral equation is solved by using multi term Galerkin approximation method involving ultraspherical Gegenbauer polynomials as its basis *** numerical solutions of reflection and transmission coefficients are obtained for different parametric values and these are seen to satisfy the energy *** coefficients are depicted graphically against the wave number in a number of *** figures available in the literature drawn by using different mathematical methods as well as laboratory experiments are also recovered following the present analysis without the presence of ice cover,thereby confirming the correctness of the results presented *** is also observed that the reflection and transmission coefficients depend significantly on the width of the barriers.

关键词： Rectangular thick barrier Ice cover Water wave scattering Multi term Galerkin approximation technique Reflection and transmission coefficients