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Euler-Euler CFD modeling of fluidized bed:Influence of specularity coefficient on hydrodynamic behavior

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Particuology 2013年第6期11卷 673-680页

作者： Chanchal Loha Himadri Chattopadhyay Pradip K.chatterjee Thermal Engineering Group CSIR-Central Mechanical Engineering Research Institute Department of Mechanical Engineering Jadavpur University

Euler-Euler two-fluid model is used to simulate the hydrodynamics of gas-solid flow in a bubbling flu- idized bed with Geldert B particles where the solid property is calculated by applying the kinetic theory of granular flow （KTGF）. Johnson and Jackson wall boundary condition is used for the particle phase, and different amount of slip between particle and wall is given by varying the specularity coefficient （φ） from 0 to 1. The simulated particle velocity, granular temperature and particle volume fraction are compared to investigate the effect of different wall boundary conditions on the hydrodynamic behavior, Some of the results are also compared with the available experimental data from the literature. It was found that the model predictions are sensitive to the specularity coefficient. The hydrodynamic behavior deviated sig- nificantly for φ = 0 and φ = 0.01 with maximum deviation found at φ = 0 i.e. free-slip condition. However, the overall bed height predicted by all the conditions is similar.

关键词： Fluidized bed Hydrodynamics Specularity coefficient CFD

D-optimal Designs for Multiresponse Linear Models with a Qualitative Factor Under General Covariance Structure

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Acta Mathematicae Applicatae Sinica 2023年第4期39卷 878-885页

作者： Rong-Xian YUE Xin LIU Kashinath chatterjee College of Mathematics and Science Shanghai Normal UniversityShanghai 200234China College of Science Donghua UniversityShanghai 201620China Department of Statistics Visva-Bharati UniversitySantiniketanIndia

This paper considers a linear regression model involving both quantitative and qualitative factors and an m-dimensional response variable y. The main purpose of this paper is to investigate D-optimal designs when the levels of the qualitative factors interact with the levels of the quantitative factors. Under a general covariance structure of the response vector y, here we establish that the determinant of the information matrix of a product design can be separated into two parts corresponding to the two marginal designs. Moreover, it is also proved that D-optimal designs do not depend on the covariance structure if we assume hierarchically ordered system of regression models.

关键词： D-optimal designs Multiresponse linear models Qualitative factors

Advanced microemulsion synthesis and characterization of wollastonite （CaSiO3）fpolystyrene one-dimensional nanorods with core-shell structures

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Particuology 2017年第1期15卷 118-128页

作者： Aniruddha chatterjee Prashant Khobragade, Satyendra Mishra Jitendra Naik University Institute of Chemical Technology North Maharashtra University Jalgaon 425001 Maharashtra India

In this work, one-dimensional core-shell nanorods （CSNRs; 185-250nm wide and 1-1.5μm long） consisting of triethoxyvinylsilane-modified wollastonite （CaSiO3） nanorods （MWNRs） as a core and polystyrene as a shell with uniform size were successfully synthesized using an advanced microemulsion technique. The effect of varying the surfactant cetyltrimethylammonium bromide （producing CSNRSCTAB） or sodium dodecyl sulphate （producing CSNRSSDS） upon the size and morphology of the CSNRs was investigated by field-emission scanning electron microscopy （FE-SEM）. X-ray diffractometry and Fourier transform infrared spectrophotometer revealed the existence of a strong interaction between the MWNRs and polystyrene, which implies that the polymer chains were successfully grafted onto the surface of the MWNRs. The CSNRs were blended with polypropylene by melt processing, and the effect of the CSNRs upon the morphological properties of the polypropylene matrix was investigated by FE-SEM and atomic force microscopy. It was observed that the polystyrene chains that grafted onto the CaSiO3 nanorods interfered with the aggregation of CaSiO3 nanorods in the polypropylene matrix and thus improved the compatibility of the CaSiO3 nanorods with the polypropylene matrix. Furthermore, the compatibility of CaSiO3 nanorods with polypropylene of CSNRsDs/polypropylene was superior to that of CSNRCTAB/polypropylene.

关键词： Core-shell structures Atomized microemulsion One-dimensional nanorods

Construction of Optimal Mixed-Level Uniform Designs

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Journal of Systems Science & Complexity 2024年第2期37卷 841-862页

作者： chatterjee Kashinath LIU Min-Qian QIN Hong YANG Liuqing Department of Population Health Sciences Division of Biostatistics and Data ScienceAugusta UniversityGA 30912USA NITFID LPMC&KLMDASRSchool of Statistics and Data ScienceNankai UniversityTianjin 300071China School of Statistics and Mathematics Zhongnan University of Economics and LawWuhan 430073China

The theory of uniform design has received increasing interest because of its wide application in the field of computer *** generalized discrete discrepancy is proposed to evaluate the uniformity of the mixed-level factorial *** this paper,the authors give a lower bound of the generalized discrete discrepancy and provide some construction methods of optimal mixed-level uniform designs which can achieve this lower *** methods are all deterministic construction methods which can avoid the complexity of stochastic *** saturated mixed-level uniform designs and supersaturated mixed-level uniform designs can be obtained with these ***,the resulting designs are also χ^(2)-optimal and minimum moment aberration designs.

关键词： Generalized discrete discrepancy Hadamard matrix mixed-level design orthogonal array supersaturated design

A resampling approach to estimation of the linking variance in the Fay–Herriot model

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Statistical Theory and Related Fields 2019年第2期3卷 170-177页

作者： Snigdhansu chatterjee School of Statistics University of MinnesotaMinneapolisMNUSA

In the Fay–Herriot model,we consider estimators of the linking variance obtained using different types of resampling *** usefulness of this approach is that even when the estimator from the original data falls below zero or any other specified threshold,several of the resamples can potentially yield values above the *** establish asymptotic consistency of the resampling-based estimator of the linking variance for a wide variety of resampling schemes and show the efficacy of using the proposed approach in numeric examples.

关键词： Linking variance Prasad–Rao estimator paired bootstrap m-out-of-n bootstrap Bayesian bootstrap

Investigating the fission dynamics of the following neutron shell closed nuclei within a stochastic dynamical approach:^(210)Po,^(212)Rn,and ^(213)Fr

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Chinese Physics C 2023年第3期47卷 127-137页

作者： Divya Arora P.Sugathan A.chatterjee Inter-University Accelerator Centre Aruna AsafAli MargNew Delhi 110067India

The dissipative dynamics of nuclear fission is a well confirmed phenomenon that can be either described by a Kramers-modified statistical model or by a dynamical model employing the Langevin *** dynamical models as well as statistical models incorporating fission delays have been found to explain the measured fission observables in several studies,they present conflicting results for shell closed nuclei in the mass region of ***,an analysis of the recent data on neutron shell closed nuclei in the excitation energy range of 40-80 MeV failed to provide a satisfactory description of the data,which was attributed to a mismatch with shell effects and/or entrance channel effects,without reaching a definite *** the present study,we demonstrate that a well established stochastic dynamical code can simultaneously reproduce the available data for pre-scission neutron multiplicities and fission and evaporation residue excitation functions for the following neutron shell closed nuclei^(210)Po and^(212)Rn and their isotopes^(206)Po and^(214,216)Rn without the need for including any extra shell or entrance channel *** relevant calculations are performed by using a phenomenological universal friction form factor with no ad-hoc adjustment of the model ***,we note a significant deviation,beyond experimental errors,for some Frisotopes.

关键词： fusion-fission nuclear dissipation dynamical model neutron shell closure saddle shell corrections

Structural, microstructural, and thermal characterizations of a chalcopyrite concentrate from the Singhbhum shear zone, India

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International Journal of Minerals,Metallurgy and Materials 2015年第3期22卷 225-232页

作者： Ritayan chatterjee Shamik Chaudhuri Saikat Kumar Kuila Dinabandhu Ghosh Department of Metallurgical and Materials Engineering Jadavpur University Division of Materials Engineering Lund University

The structural and morphological characterizations of a chalcopyrite concentrate, collected from the Indian Copper Complex, Ghatshila, India, were carried out by X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The con- centmte powder was composed mainly of free chalcopyrite and low quartz in about 3：1 weight ratio. The particle size was about 100 μm. Spectroscopic studies （FTIR, Raman, UV-visible） of the concentrate supported the XRD findings, and also revealed a marginal oxidation of the sulfide phase. The energy band gap of the sulfide was found to be 3.4 eV. Differential thermal analysis and thermogravimetry of the con- centrate showed a decomposition of chalcopyrite at 658 K with an activation energy of 208 kJ-mol 1, and two successive structural changes of silica at 848 K and 1145 K.

关键词： chalcopyrite structural properties microstructure thermal characteristics

Acanthus ilicifolius plant extract prevents DNA alterations in a transplantable Ehrlich ascites carcinoma-bearing murine model

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World Journal of Gastroenterology 2007年第48期13卷 6538-6548页

作者： Tridib Chakraborty Dipak Bhuniya Mary chatterjee Mosiur Rahaman Dipak Singha Baidya Nath chatterjee Subrata Datta Ajay Rana Kartick Samanta Sunil Srivastawa Sankar K Maitra Malay chatterjee Chemical Carcinogenesis and Chemoprevention Laboratory Division of Biochemistry Department of Pharmaceutical Technology Jadavpur University Division of Medicinal Chemistry Indian Institute of Chemical Biology Jadavpur East Calcutta Girls' College Lake Town Cell Signaling Laboratory Cardiovascular and Cancer Research Institute College of Medicine The Texas A&M University System HSC Temple TX 76504 United States

AIM： To investigate the chemopreventive efficacy of the Indian medicinal plant Acanthus ilicifolius L Acanthaceae in a transplantable Ehrlich ascites carcinoma （EAC）- bearing murine model.METHODS： Male Swiss albino mice were divided into four groups： Group A was the untreated normal control; Group B was the EAC control mice group that received serial, intraperitoneal （ip） inoculations of rapidly proliferating 2 × 10^5 viable EAC cells in 0.2 mL of sterile phosphate buffered saline; Group C was the plant extract-treated group that received the aqueous leaf extract （ALE） of the plant at a dose of 2.5 mg/kg body weight by single ip injections, once daily for 10, 20 and 30 consecutive days following tumour inoculation （ALE control）; and Group D was the EAC ＋ ALE- treatment group. The chemopreventive potential of the ALE was evaluated in a murine model by studying various biological parameters and genotoxic markers, such as tumour cell count, mean survival of the animals, haematological indices, hepatocellular histology, immunohistochemical expression of liver metallothionein （MT） protein, sister-chromatid exchanges （SCEs）, and DNA alterations.RESULTS： Treatment of the EAC-bearing mice with the ALE significantly （P 〈 0.001） reduced viable tumour cell count by 68.34% （228.7 × 10^6 ± 0.53） when compared to EAC control mice （72.4 × 10^6 ± 0.49）, and restored body and organ weights almost to the normal values. ALE administration also increased （P 〈 0.001） mean survival of the hosts from 35 ± 3.46 d in EAC control mice to 83 ± 2.69 d in EAC ＋ ALE-treated mice. Haematological indices also showed marked improvement with administration of ALE in EAC-bearing animals. There was a significant increase in RBC count （P 〈 0.001）, hemoglobin percent （P 〈 0.001）, and haematocrit value （P 〈 0.001） from 4.3 ± 0.12, 6.4 ± 0.93, and 17.63 ± 0.72 respectively in EAC control mice to 7.1 ± 0.13, 12.1 ± 0.77, and 30.23 ± 0.57 respectively in EAC ＋ ALE-treated group, along with concurrent de

关键词： Acanthus ilicifolius Chemoprevention DNA strand-breaks Ehrlich ascites carcinoma Haematological indices Medicinal plants Metallothionein Sister- chromatid exchange Transplantable tumour

A three-pronged analysis confirms the association of the serotoninergic system with attention deficit hyperactivity disorder

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World Journal of Pediatrics 2022年第12期18卷 825-834页

作者： Mahasweta chatterjee Sharmistha Saha Swagata Sinha Kanchan Mukhopadhyay Manovikas Biomedical Research and Diagnostic Centre Manovikas Kendra482 MadudahPlot I-24Sector JEM BypassKolkataWest Bengal700107India

Background The serotonin transporter(SERT),encoded by the solute carrier family 6 number 4(SLC6A4)gene,controls serotonin(5-HT)availability and is essential for the regulation of behavioral *** SLC6A4 genetic variants,5-HTTLPR and STin2,were widely investigated in patients with various neurobehavioral disorders,including attention deficit hyperactivity disorder(ADHD).Methods We analyzed the association of the 5-HTTLPR(L/S)and STin2(10/12)variants,plasma 5-HT,and 5-hydroxyindole acetic acid(5-HIAA),as well as SERT messenger RNA(mRNA)with ADHD in the eastern Indian *** families with ADHD probands(n=274)and ethnically matched controls(n=367)were recruited following the Diagnostic and Statistical Manual of Mental *** traits,executive function,and intelligence quotient(IQ)of the probands were assessed using the Conner's Parent Rating Scale–Revised,Parental Account of Children’s Symptoms(PACS),Barkley Deficit in Executive Functioning—Child and Adolescent Scale,and Wechsler Intelligence Scale for Children-III,*** obtaining informed written consent,peripheral blood was collected to analyze genetic variants,plasma 5-HT,5-HIAA,and SERT mRNA *** ADHD probands showed a higher frequency of the 5-HTTLPR“L”allele and“L/L”genotype(P<0.05),lower 5-HIAA level,and higher SERT mRNA *** for behavioral problems and hyperactivity were higher in the presence of the“S”allele and“S/S”genotype,while executive deficit was higher in the presence of the“L”*** score was lower in the presence of the STin2“12”allele and L-12 *** Data obtained indicate a significant association of the serotoninergic system with ADHD,warranting further in-depth investigation.

关键词： Attention deficit hyperactivity disorder 5-Hydroxyindole acetic acid 5-Serotonin 5-HTT-linked polymorphic region SERT mRNA