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Comparison of burn rate and thermal decomposition of AP as oxidizer and PVC and HTPB as fuel binder based composite solid propellants

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Defence Technology（防务技术） 2019年第2期15卷 227-232页

作者： A.manash P.Kumar Department of Mechanical Engineering VVIT Department of Mechanical Engineering K N Modi Engineering and Technology

In the present investigation an effort has been made to understand the thermal decomposition and burn rate characteristics of AP as oxidizer and PVC and HTPB as fuel binder in composite solid propellant. The burning rate study has been carried out at ambient and different pressures of 2.068 Mpa, 4.760 Mpa,6.895 Mpa. The mechanism of thermal decomposition of each composition have also been determined by NETZSCH simultaneous thermal analyser, comprising differential scanning calorimeter(DSC) and thermo-gravimetric analyser(TGA). An effort has been made to study the burn rate and decomposition of fuel binder and oxidizer in presence of Fe_2O_3 and also their overall impact on combustion of propellant.

关键词： Thermal decomposition Burn rate Thermo-gravimetric analysis AP PVC HTPB Fe2O3

Plant growth-promoting rhizobacteria--alleviators of abiotic stresses in soil: A review

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Pedosphere 2020年第1期30卷 40-61页

作者： Madhurankhi GOSWAMI Suresh deka Environmental Biotechnology Laboratory Resource Management and Environment SectionLife Sciences DivisionInstitute of Advanced Study in Science and Technology(IASST)Guwahati Assam 781035(India)

With the continuous increase in human population,there is widespread usage of chemical fertilizers that are responsible for introducing abiotic stresses in agricultural crop *** stresses are major constraints for crop yield and global food security and therefore require an immediate *** implementation of plant growth-promoting rhizobacteria(PGPR)into the agricultural production system can be a profitable alternative because of its efficiency in plant growth regulation and abiotic stress *** bacteria have the potential to promote plant growth and to aid in the management of plant diseases and abiotic stresses in the soil through production of bacterial phytohormones and associated metabolites as well as through significant root morphological *** changes result in improved plant-water relations and nutritional status in plants and stimulate plants’defensive mechanisms to overcome unfavorable environmental ***,we describe the significance of plant-microbe interactions,highlighting the role of PGPR,bacterial phytohormones,and bacterial metabolites in relieving abiotic environmental stress in *** research is necessary to gather in-depth knowledge on PGPR-associated mechanisms and plant-microbe interactions in order to pave a way for field-scale application of beneficial rhizobacteria,with the aim of building a healthy and sustainable agricultural ***,this review aims to emphasize the role of PGPR in growth promotion and management of abiotic soil stress with the goal of developing an eco-friendly and cost-effective strategy for future agricultural sustainability.

关键词： phytohormones plant-microbe interaction root colonization root morphological change secondary metabolites stress alleviation stress tolerance

A Batch Arrival Retrial Queue with Two Phases of Service and Bernoulli Vacation Schedule

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Acta Mathematicae Applicatae Sinica 2013年第1期29卷 15-34页

作者： Gautam Choudhury Kandarpa deka Mathematical Sciences Division Institute of Advanced Study in Science and Technology Paschim Boragaon Guwahati-781035 Assam India

We consider an MX/G/1 queueing system with two phases of heterogeneous service and Bernoulli vacation schedule which operate under a linear retrial policy. In addition, each individual customer is subject to a control admission policy upon the arrival. This model generalizes both the classical M/G/1 retrial queue with arrivals in batches and a two phase batch arrival queue with a single vacation under Bernoulli vacation schedule. We will carry out an extensive stationary analysis of the system, including existence of the stationary regime, embedded Markov chain, steady state distribution of the server state and number of customer in the retrial group, stochastic decomposition and cMculation of the first moment.

关键词： Batch arrival retrial queue two phase service linear retrial policy bernoulli admission mechanism bernoulli vacation schedule

Combustion performance studies of aluminum and boron based composite solid propellants in sub-atmospheric pressure regimes

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Propulsion and Power Research 2019年第4期8卷 329-338页

作者： Pratim Kumar Mayank Varshney Aniket manash Department of Aerospace Engineering and Applied Mechanics IIESTShibpurHowrahWest Bengal711103India Indian Institute of Technology(Indian School of Mines) DhanbadJharkhand862004India Aryabhatta Center for Nanoscience&Technology AKUPatnaBihar800001India

The aim of present study is to investigate the burning rate,ignition delay,and flame characteristics of ammonium perchlorate(AP)-hydroxyl terminated poly-butadiene(HTPB)[AP/HTPB]based composite propellants(CSP's)in sub-atmospheric pressure regimes(13 kPae100 kPa).Several fuels and catalyzed were used to evaluate their effects on the combustion characteristics of AP based propellants in sub-atmospheric pressure *** fuels,aluminum(Al)and boron(B)were selected as metallic and non-metallic fuel *** in catalyst,butyl ferrocene(B.F.)and ferric oxide(F.O.)were selected as liquid and solid catalyst *** from these,other ingredients that were used are di-octyl adipate(DOA),toluene di-isocyanate(TDI),and *** article throws some light on the burning rate and ignition delay properties for these new classes of prepared propellant *** subatmospheric pressures,all propellants are susceptible to irregular burning with the ejection of soot's,fumes,and unburned *** catalyzed propellants can sustain its combustion up to the lowest pressure.

关键词： AP/HTPB Metallic/non-metallic fuel Catalyst Sub-atmospheric pressure Burning rate Base-bleed

Supersonic Shock Wave with Landau Quantization in a Relativistic Degenerate Plasma

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Chinese Physics Letters 2020年第1期37卷 34-38页

作者： M.Kr.deka A.N.Dev Department of Applied Sciences Gauhati UniversityGuwahati-781014AssamIndia Center for Applied Mathematics and Computing Siksha O Anusandhan(Deemed to be University)Bh u baneswar-751030OdishaIndia

A three-dimensional(3D)BurgersJ equation adopting perturbative methodology is derived to study the evolution of a shock wave with Landau quantized magnetic field in relativistic quantum *** characteristics of a shock wave in such a plasma under the influence of magnetic quantization,relativistic parameter and degenerate electron density are studied with assistance of steady state *** magnetic field has a noteworthy control,especially on the shock wave's amplitude in the lower range of the electron density,whereas the amplitude in the higher range of the electron density reduces *** rate of increase of shock wave potential is much higher(lower)with a magnetic Held in the lower(higher)range of electron *** the relativistic factor,the shock wave's amplitude increases significantly and the rate of increase is higher(lower)for lower(higher)electron *** combined effect of the increase of relativistic factor and the magnetic field on the strength of the shock wave,results in the highest value of the wave potential in the lower range of the degenerate electron density.

关键词： density. solution. relativistic

Intelligent Cloud IoMT Health Monitoring-Based System for COVID-19

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Computers, Materials & Continua 2022年第7期72卷 497-517页

作者： Hameed AlQaheri manash Sarkar Saptarshi Gupta Bhavya Gaur Department of Information Systems and Operation Management College of Business AdministrationKuwait University13060Kuwait Atria Institute of Technology BengaluruKarnatakaIndia Electronics and Communication Engineering SRM Institute of Science&TechnologyDelhi-NCR201204India Business Technology Analyst ZS AssociatesPune411014India

The most common alarming and dangerous disease in the world today is the coronavirus disease 2019(COVID-19).The coronavirus is perceived as a group of coronaviruses which causes mild to severe respiratory diseases among human *** infection is spread by aerosols emitted from infected individuals during talking,sneezing,and ***,infection can occur by touching a contaminated surface followed by transfer of the viral load to the *** may occur through aerosols that stay suspended in the air for extended periods of time in enclosed *** stop the spread of the pandemic,it is crucial to isolate infected patients in quarantine *** health organizations faced a lack of quarantine houses and medical test facilities at the first level of testing by the proposed *** any serious condition is observed at the first level testing,then patients should be recommended to be *** this study,an IoT-enabled smart monitoring system is proposed to detect COVID-19 positive patients and monitor them during their home *** Internet of Medical Things(IoMT),known as healthcare IoT,is employed as the foundation of the proposed *** least-squares(LS)method was applied to estimate the linear model parameters for a sequential pilot survey.A statistical sequential analysis is performed as a pilot survey to efficiently collect preliminary data for an extensive survey of COVID-19 positive *** Bayesian approach is used,based on the assumption of the random variable for the priori distribution of the data *** inference is used to construct different rules based on the basic symptoms of COVID-19 patients to make an expert decision to detect COVID-19 positive ***,the performance of the proposed model was determined by applying a four-fold cross-validation technique.

关键词： Pandemic COVID-19 internet of medical things least square fuzzy inference

Analysis of electron energy distribution function in a magnetically filtered complex plasma

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Chinese Physics B 2013年第4期22卷 324-329页

作者： M K deka H Bailung N C Adhikary Physical Sciences Division Institute of Advanced Study in Science and Technology Vigyan Path Paschim Boragaon Garchuk Guwahati-781035 Assam India

The electron energy distribution function （EEDF） for a magnetically filtered dusty plasma is studied in a dusty double plasma device where the electron energy can be varied from 0.15 eV to ～ 2.8 eV and plasma density from 10 6 cm-3 to 10 9cm-3 . The characteristics of EEDF for these ranges of plasma parameters are investigated in a pristine plasma as well as in a dusty plasma. The results show that in the presence of dust, there is a drastic modification in EEDF patterns in a plasma with higher electron temperature and density than those in a low temperature and low density plasma produced by the magnetic filter.

关键词： dusty plasma magnetic filter electron energy distribution function

Remediation of polycyclic aromatic hydrocarbon-contaminated soils using microbes and nanoparticles: A review

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Pedosphere 2023年第1期33卷 93-104页

作者： Ritu PANWAR jyoti MATHUR Department of Bioscience and Biotechnology Banasthali VidyapithRajasthan 304022India

Polycyclic aromatic hydrocarbon(PAH)pollution is a global concern because of their toxicity to environment and ecosystem,which induces adverse effects on plants,animals,and *** are mainly released from natural and anthropogenic activities,such as incomplete fuel combustion,leakages in oil pipelines,and the extensive use of pesticides;PAH contaminants include petroleum hydrocarbons(PHCs),halogenated hydrocarbons,chlorophenols,and *** using microorganisms such as bacteria and fungi is developing as an effective and promising technique to remediate PAHs from the *** to their remediation efficiency,this method is environmentally friendly and represents a novel approach for reducing the risk of PAHs to human health and the *** may be applied in bioremediation,and will not only induce fewer toxic effects but also reduce the effective overall time and costs *** article provides a summary of the application of nanomaterials,bacteria,and fungi to PAH remediation;we review and briefly discuss the structure,properties,sources,fate,toxicity,and remediation approaches involved in the remediation of PAH-polluted sites.

关键词： bioremediation microorganisms pesticides persistent organic pollutants petroleum hydrocarbons

Partition Identities Arising from Theta Function Identities

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Acta Mathematica Sinica,English Series 2008年第6期24卷 955-970页

作者： Nayandeep deka BARUAH Bruce C.BERNDT Department of Mathematical Sciences Tezpur UniversityNapaam-784028SonitpurAssamIndia Department of Mathematics University of Illinois at Urbana-Champaign1409 West Green St.UrbanaIL 61801USA

The authors show that certain theta function identities of Schroeter and Ramanujan imply elegant partition identities.

关键词： partitions colored partitions partition identities theta function identities modular equations