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Analysis of a fuzzy epidemic model with saturated treatment and disease transmission

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International Journal of Biomathematics 2018年第1期11卷 23-40页

作者： Swapan kumar nandi Soovoojeet Jana Manotosh Manadal T. k. kar Department of MathematicsNayabasat P. M. Sikshaniketan Paschim Medinipur 721253 West Bengal India Department of Mathematics Ramsaday College Amta 711501 West Bengal India Department of Mathematics Tamralipta MahavidyalayaTamluk 721636 West Bengal India Department of MathematicsIndian Institute of Engineering Science and Technology Shibpur Howrah 711103 West Bengal India

In this paper, we describe an SIS epidemic model where both the disease transmission rate and treatment function are considered in saturated forms. The dynamical behavior of the system is analyzed. The system is customized by considering the disease transmission rate and treatment control as fuzzy numbers and then fuzzy expected value of the infected individuals is determined. The fuzzy basic reproduction number is investigated and a threshold condition of pathogen is derived at which the system undergoes a backward bifurcation.

关键词：疾病传播流行模型模糊期望浸透在系统动态行为模糊数字 SIS

Effects of Main-chain and Chain-ends on the Organogelation of Stearoyl Appended Pendant Valine Based Polymers

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Chinese Journal of Polymer Science 2019年第9期37卷 903-911页

作者： Mridula nandi Swagata Pan Dipannita Ghosh Priyadarsi De Polymer Research Centre and Centre for Advanced Functional Materials Department of Chemical Sciences Indian Institute of Science Education and Research Kolkata

In this work, we investigated the effect of hydrophobic interactions between the polymeric backbone and chain-end groups on the self-assembly pathway of stearoyl appended side-chain valine (Val)-based poly(methacrylate/acrylate) homopolymers in different organic hydrocarbons. Gelation studies conducted revealed that while polymers with polyacrylate as backbone induces gelation in several organic hydrocarbons, polymers with polymethacrylate in the main-chain significantly hinders macroscopic gelation. Morphology of the organogels was analysed by field emission scanning electron microscopy (FESEM), and mechanical strengths of the organogels were determined by rheological measurements. Reversible addition-fragmentation chain transfer (RAFT) polymerization chain transfer agents (CTA)s,[R1 —S—C=(S)—S—R2] with different —Ri and — R2 groups, have been employed to study the effect of structural variation at the chain-end on macroscopic assembly mechanism. We found that the additional interactions between terminal groups via hydrogenbonding or n-n stacking interactions or both help to build up the self-assembly pathway and thereby produces mechanically stable organogels.

关键词： Organogelation Hydrophobic interactions Poly (methacrylate/aery late) backbone RAFT polymerization Self-assembly

Electric discharge phenomenon in dielectric and electrolyte medium

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Advances in Manufacturing 2018年第4期6卷 457-464页

作者： Mukesh kumar Sindhu Debasish nandi Indrajit Basak Department of Mechanical Engineering. NIT Durgapur. Durgapur 713209. India Department of Mechanical Engineering JIS College of Engineering Kalyani 741235 India

Electric discharge is a common tool nowadays for machining of materials. It may be through a liquid medium or through air. Any metals, hard alloys, and nonmetals can be machined using the energy of electric discharge. In electric discharge machining (EDM), the discharge occurs between two electrodes through a liquid medium and it is applicable only for electrically con ducting materials and alloys. In electrochemical discharge machining (ECDM), the medium is an aqueous electrolyte and it is of two types. In the first type, the discharge occurs between two electrodes. One of the electrodes is the workpiece, and the other is the tool. In the second type, the discharge occurs between one electrode and an electrolyte. It is used for electrically nonconducting materials and the discharge energy is utilized maintaining the nonconducting workpiece in proximity of the discharge. All these electrical discharges are transient phenomena and do not result in a stable discharge in the form of arc. The output parameters depend on the discharge energy that requires precise control to maintain the accuracy of the machining. For micromachining, the control of the discharge is paramount both in terms of energy and pattern. Using various shaped tools, machining media with additives, different types of applied potentials, and supporting mechanical motions are some of the attempts made to improve the machining output. Optimization of these parameters for machining particular materials (or alloys) is a popular field of research. The present work is directed toward the investigation of discharge initiation and development by analyzing the cell current and discharge voltage relationship for both EDM and ECDM. The rectangular direct current (DC) pulse with different frequencies and the duty factor (on-off time ratio) are used for investigation. Observations on the voltage-current relationship are made for the external potential prior to discharge at discharge and above the discharge potenti

关键词： Electric discharge Electric discharge machining (EDM) Electrochemical discharge machining (ECDM) Pulsed direct current (DC) Duty factor

A generic method for rock mass classification

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Journal of Rock Mechanics and Geotechnical Engineering 2018年第1期10卷 102-116页

作者： Vitthal M.khatik Arup kr.nandi Department of Mechanical Engineering Indian Institute of TechnologyKanpur208016India Engineering Design Group CSIR-Central Mechanical Engineering Research InstituteMG AvenueDurgapur713209India

Rock mass classification(RMC) is of critical importance in support design and applications to mining,tunneling and other underground excavations. Although a number of techniques are available, there exists an uncertainty in application to complex underground works. In the present work, a generic rock mass rating(GRMR) system is developed. The proposed GRMR system refers to as most commonly used techniques, and two rock load equations are suggested in terms of GRMR, which are based on the fact that whether all the rock parameters considered by the system have an influence or only few of them are influencing. The GRMR method has been validated with the data obtained from three underground coal mines in India. Then, a semi-empirical model is developed for the GRMR method using artificial neural network(ANN), and it is validated by a comparative analysis of ANN model results with that by analytical GRMR method.

关键词： Rock mass classification(RMC) Generic system Rock load Mathematical model Artificial neural network(ANN)

Revisiting Pauwels' classification of femoral neck fractures

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World Journal of Orthopedics 2021年第11期12卷 811-815页

作者： Sumon nandi Orthopaedic Surgery Department University of Maryland School of MedicineBaltimoreMD 21201United States

Pauwels’femoral neck fracture classification is based on the biomechanical principle that shear stress and varus force increase along more vertically oriented fractures,resulting in higher risk of fracture displacement and ultimately *** principle continues to guide construct selection for femoral neck fracture internal fixation and is the foundation for treating non-union with valgus ***,with poor inter-and intra-rater reliability,dated treatment recommendations,and unreliable prognostic value,the Pauwels classification cannot be directly applied in its entirety to the management of femoral neck fractures in modern practice.

关键词： Pauwels Fracture Femoral neck Internal fixation Arthroplasty

In vitro and in vivo degradability,biocompatibility and antimicrobial characteristics of Cu added iron-manganese alloy

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Journal of Materials Science & Technology 2021年第25期84卷 159-172页

作者： Santanu Mandal Vijay kishore Madhuparna Bose Samit kumar nandi Mangal Ro Department of Metallurgical and Materials Engineering Indian Institute of Technology-KharagpurKharagpur 721302India Department of Veterinary Surgery&Radiology West Bengal University of Animal&Fishery SciencesKolkata 700037India Department of Biotechnology Indian Institute of TechnologyKharagpur 721302India

In recent years,iron(Fe)based degradable metal is explored as an alternative to permanent fracture fixation *** the present work,copper(Cu)is added in Fe-Mn system to enhance the degradation rate and antimicrobial ***-Mn-x Cu(x=0.9,5 and 10 wt.%)alloys are prepared by the meltingcasting-forging *** analysis confirms austenite phase stabilization due to the presence of Mn and *** predicted by Thermo-Calc calculations,Cu rich phase precipitations are noticed along the austenite grain *** behaviours of Cu added Fe-Mn alloys are investigated through static immersion and electrochemical polarization where enhanced degradation is found for higher Cu added *** challenged against *** bacteria,the Fe-Mn-Cu alloy media extract shows a significant bactericidal effect compare to the base *** vitro cytocompatibility studies,as determined using MG63 and MC3T3-E1 cell lines,indicate increased cell density as a function of time for all the *** implanted in rabbit femur,the newly developed alloy does not show any kind of tissue necrosis around the *** osteogenesis and higher new bone formation are observed with Fe-Mn-10 Cu alloy as evident from micro-computed tomography(μ-CT)and fluorochrome labelling.

关键词： Iron-manganese alloy Degradable metal In vitro Micro-CT

Effect of weathering on physico-chemical properties and combustion behavior of an Indian thermal coal

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International Journal of Coal Science & Technology 2019年第1期6卷 51-62页

作者： Subhajit Aich Barun kumar nandi Sumantra Bhattacharya Department of Fuel and Mineral Engineering Indian Institute of Technology (Indian School of Mines)Dhanbad Dhanbad Jharkhand 826004India

An open air stockpile of conical shape was formed with 3.5 m base diameter and 5 m height using 500 tons of -200 mm size ROM thermal coal on a concrete floor. Coal sample from the stockpile were collected at 30 days interval for analysis of various chemical properties like;proximate analysis, ultimate analysis, gross calorific value (GCV) and various combustion related properties such as ignition temperature, peak temperature, burnout temperature, maximum combustion rate, ignition index, burnout index, combustion performance index and combustion rate intensity index. Experimental results show that, due to weathering of coal fixed carbon decreased from 35.6% to 19.9%, elemental carb on (C) decreased from 46.6% to 28.6%, hydrogen (H) decreased from 3.3% to 2.9% and GCV decreased by up to 55% of original value during 330 days of storage of coal in an open atmosphere. Ash con tent of coal increased form 29.2% to 46.6% due to loss of combustibles. Sulfur (S) of coal was found to get increased from 0.33% to 1.08% during storage. The activation energy of coal combustion increased from 22 kJ/mol to 54 kJ/mol. Variation in combustion parameters signifies that weathering has significant negative impact on coal combustion properties as coal become difficult to ignite.

关键词： Weathering of coal TGA-DTG Combustibles Coal combustion Activation energy

Relationship between proximate analysis parameters and combustion behaviour of high ash Indian coal

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International Journal of Coal Science & Technology 2020年第4期7卷 766-777页

作者： Subhajit Aich Dibyajyoti Behera Barun kumar nandi Sumantra Bhattacharya Department of Fuel Minerals and Metallurgical Engineering Indian Institute of Technology(Indian School of Mines)DhanbadDhanbadJharkhand 826004India

This work presents the analysis of combustion characteristics of high ash Indian coal(28%-40%)collected from different mines of Singaurali coalfield,*** the coal samples were characterized by proximate and gross calorific value *** performance of the coals were characterised using thermo-gravimetric analysis to identify the burning profile of individual *** combustion kinetic parameters such as ignition temperature,peak temperature and burnout temperature,ignition index and burnout index,combustion performance index plus rate and intensity index of combustion process,activation energy were determined to analyse the combustion behaviour of *** all these combustion properties were compared with the volatile matter,ash,fixed carbon and fuel ratio of each *** analysis shows that with increase in ash content,combustion performance initially increases and later ***,coal with(25±1.75)%volatile matter,20%-35%ash and fuel ratio 1.4-1.5 were found to be optimum for coal combustion.

关键词： TGA-DTG Proximate analysis Combustion kinetics Activation energy Burning profile

Development of a Polyclonal Antibody-based AC-ELISA and Its Comparison with PCR for Diagnosis of Canine Parvovirus Infection

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Virologica Sinica 2010年第5期25卷 352-360页

作者： Manoj kumar Sukdeb nandi Sunil Chidri Virology Laboratory Centre for Animal Disease Research and DiagnosisIndian Veterinary Research Institute

A polyclonal antibody-based antigen-capture ELISA (AC-ELISA) has been developed for detection of Canine parvovirus (CPV) antigens in faecal samples of dogs. The assay uses rabbit anti-CPV polyclonal antibody as the capture antibody, guinea pig anti-CPV polyclonal antibody as tracing antibody and anti-guinea pig HRPO conjugate as the detection system. The optimum dilution of the capture antibody and the tracing antibody capable of detecting the CPV-2 antigens was found to be 1:1 600 and 1:400, respectively, in the check-board titration. In this study, a total of 152 samples (129 faecal samples and 23 cell culture supernatant) were tested both by AC-ELISA and by polymerase chain reaction (PCR). Of the samples tested, 69 and 78 samples were found positive by AC-ELISA and PCR, respectively. The AC-ELISA had relative sensitivity, relative specificity and accuracy of 88.4%, 100.0% and 91.4% respectively. The analytical sensitivity of AC-ELISA was estimated to be 102.8 TCID50/mL whereas PCR sensitivity was 100.8 TCID50/mL. The AC-ELISA is a simple, quick and reliable method for screening large numbers of faecal samples of dogs suspected of CPV infection.

关键词： ELISA法犬细小病毒感染多克隆抗体 PCR检测 AC 基础诊断聚合酶链反应