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Asian Pacific Journal of Tropical Medicine 2010年第12期3卷 954-956页

作者： Supratik Chakraborty Someshwar Singha Goutam chandra Mosquito and Microbiology Research Units Parasitology LaboratoryDepartment of ZoologyBurdwan UniversityWest BengalIndia

Objective:To observe the effect of two common organic acids on the larvae of Aedes aegypti (***)(L),the natural vector of dengue fever/dengue hemorrhage fever,chikugunya and allergic skin reaction especially in ***:Two common organic acids(lactic acid and orthophosporic acid of gradually increasing concentration) were used against laboratory reared third instars larvae of *** in order to observe the rate of mortality after 8.16 and 24 h of post exposure respectively in ***:Larval mortality rates recorded were in the following sequences:orthophosphoric acid and lactic acid at 1:1 combination >orthophosphoric acid>lactic ***:These two organic acids may be used perfectly in combination (1:1) along with other conventional vector control methods to reduce the *** population, especially in those areas where surveillance and supervisory mechanism are poor or insufficient.

关键词： Orthophosporic acid Lactic acid Ae.aegypti Mosquito larvicidal Synergistic effect

Magneto-Soret-Dufour thermo-radiative doublediffusive convection heat and mass transfer of a micropolar fluid in a porous medium with Ohmic dissipation and variable thermal conductivity

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Propulsion and Power Research 2022年第1期11卷 154-170页

作者： Dulal Pal Bhuban chandra Das Kuppalapalle Vajravelu Department of Mathematics Siksha BhavanaVisva-Bharati UniversitySantiniketan731235West BengalIndia Department of Mathematics Rammohan College102/1 Raja Rammohan SaraniKolkata700009India Department of Mathematics Department of MechanicalMaterial and Aerospace EngineeringUniversity of Central FloridaOrlandoFL32816USA

This paper deals with developing a numerical boundary layer flow model to analyze convective heat transfer characteristics of a micropolar fluid past a vertical plate in a composite material with viscous-Ohmic dissipations in the presence of a transverse magnetic *** basic governing equations are solved numerically by using the Runge-Kutta-Fehlberg *** computed results reveal a reduction in the velocity,temperature,and microrotation profiles by increasing the Prandtl ***,the concentration distribution is enhanced by enhancing or decreasing Soret-Dufour parameter,and there seems to be decremented in the skin-friction coefficient values with Schmidt number.

关键词： Double diffusive convection Thermal radiation Micropolar fluid Soret-Dufour

Performance analysis of silicon nanowire transistors considering effective oxide thickness of high-k gate dielectric

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Journal of Semiconductors 2014年第4期35卷 48-51页

作者： S.Theodore chandra N.B.Balamurugan National Instruments Electronics Laboratory Department of ECE Thiagarajar College of Engineering

We have analyzed the effective oxide thickness （EOT） of the dielectric material for which we have optimum performance and the output characteristics of the silicon nanowire transistors by replacing the traditional Si02 gate insulator with a material that has a much higher dielectric constant （high-k） gate, materials like Si3N4, Al2O3, Y2O3 and HfO2. We have also analyzed the channel conductance, the effect of a change in thickness, the average velocity of the charge carrier and the conductance efficiency in order to study the performance of silicon nanowire transistors in the nanometer region. The analysis was performed using the Fettoy, a numerical simulator for ballistic nanowire transistors using a simple top of the barrier （Natori） approach, which is composed of several matlab scripts. Our results show that hafnium oxide （HfO2） gate insulator material provides good thermal stability, a high recrystallization temperature and better interface qualities when compared with other gate insulator materials; also the effective oxide thickness of lifO2 is found to be 0.4 nm.

关键词： high-k dielectric hafnium oxide silicon nanowire transistor effective oxide thickness

Inventory models for deteriorating items with fixed lifetime, partial backordering and carbon emissions policies

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Journal of Management Analytics 2023年第1期10卷 129-190页

作者： Falguni Mahato Mukunda Choudhury Gour chandra Mahata Department of Mathematics Sidho-Kanho-Birsha UniversityPuruliaIndia.

In this study,a sustainable inventory model is devised to obtain the retailer’s optimal pricing and replenishment policies for degrading items having a certain lifetime incorporating partial back order as a shortage and dynamic demand under two different scenarios(a)carbon cap and trade policy(b)carbon tax *** primary objective of this study is to maximize the retailer’s annual total *** retailer’s profit function has been optimized with the help of convexity/concavity criteria employing classical optimization *** on a real case study,two different numerical examples and corresponding optimal solutions have been shown for both models with the help of Lingo 17 ***,the impact of the major inventory parameters and prominent managerial insights are presented for the robustness of the proposed model that can cooperate with industrial managers/decision-makers for the overall improvement of his/her industry to take effective and qualitative decisions.

关键词： inventory time-varying deterioration price and stock-reliant demand partial backorder maximum lifetime carbon cap and trade(CCAT) carbon tax

Isolation and identification of bioactive antibacterial components in leaf extracts of Vangueria spinosa(Rubiaceae)

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Asian Pacific Journal of Tropical Medicine 2011年第1期4卷 35-40页

作者： Soroj Kumar Chatterjee Indranil Bhattacharjee Goutam chandra Mosquito and Microbiology Research Units Parasitology LaboratoryDepartment of ZoologyThe University of Burdwan West BengalIndia

Objective:The column chromatographic fraction of ethyl acetate(EA1,EA2,EA3,EA4 and EA5) leaf extracts of Vangueria spinosa(***) were screened for antibacterial activity and phytochemical ***:EA3 fraction was isolated and identified by column chromatography,thin layer chromatography,spectral data analysis and phytochemical screening were used for ***:EA3 fraction was significantly active at 4 to 64 mg/L against Staphylococcus aureus,Escherichia coli,Klebsiella pneumoniae and Pseudomonas aeruginosa with minimum inhibitory concentration of 1.5625 to 3.1250 mg/*** active fraction(EA3) revealed the presence of flavonoid with retention factor value(R_f) of *** active antibacterial agent in the most potent fraction(EA3) was isolated and identified as flavonoid(-)-epicatechin-3-O-β-glucopyranoside by thin layer chromatography(TLC) and phytochemical ***1 and EA2 show inhibitory activity at 4 to 64 mg/L against Staphylococcus aureus only where as fraction EA4 and EA5 do not shows any inhibitory activity within that range of concentration against any ***:The results support the ethnomedicinal use of leaf of *** for the treatment of bacterial diseases.

关键词： Vangueria spinosa Antibacterial activity Phytochemical analysis Flavonoid

Distribution Pattern of Vascular Plant Species of Mountains in Nepal and their Fate Against Global Warming

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Journal of Mountain Science 2015年第6期12卷 1345-1354页

作者： Suresh chandra SUBEDI Khem Raj BHATTARAI Ram Prasad CHAUUDHARY Earth and Environment Department Florida International University National Herbarium and Plant Laboratories Department of Plant Resources Ministry of Forest and Soil Conservation Research Center for Applied Science and Technology Tribhuvan University

This study aims to find the altitudinal distribution pattern of vascular plant species reported from high mountain of Nepal(Manang) along the whole Himalayan elevation gradient, and evaluate their fate against climate change. Data was gathered from multiple sources, field investigations, literatures, and herbarium specimens. Altogether, 303 vascular plant species were reported from Manang. We used a published data to calculate distribution range of each species by interpolating between its upper and lower elevation limits. The relationship between elevation and species richness is elucidated by generalized linear model. The consequence of global warming upon Manang's vascular plant species was estimated based on projected temperature change for next century and adiabatic lapse rate along the elevation gradient of the Himalayas. The vascular plant species richness has a unimodel relationship with elevation along the whole elevation gradient of Nepal as well as in three biogeographical regions of Nepal. Vascular plants of Manang are found distributed from low land Terai to high alpine regions of Nepal and their elevation distribution range varies from 200 to 4700 m. Out of 303 vascular plants of Manang, only seven species might be affected if temperature increase by 1.5°C, whereas at least 70 species will be affected with 5°C temperature increased. However, the majority of species(233 species) have wider distribution range(> 1000 m) and more than 5°C temperature tolerance range, thus they are likely to be less affected from global warming by the end of 21 st century.

关键词： Mountain Nepal Himalayas Elevation distribution range Global warming Temperature tolerance range Manang

Self-Healing Concrete with Crystalline Admixture——A Review

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Journal of Wuhan University of Technology(Materials Science) 2019年第5期34卷 1143-1154页

作者： A Ravitheja Dr T chandra Sekhara Reddy Dr C Sashidhar JNTU College of Engineering AnantapurAPIndia Civil Engineering GPR Engineering CollegeKurnoolAPIndia Civil Engineering JNTU College of EngineeringAnantapurAPIndia

The scope of the present paper is to understand the effects of crystalline admixture on the selfhealing capacity of the cementitious composites. Previous studies were examined and a conclusion was drawn to the effect that different additives to crystalline admixture tend to improve self-healing of concrete for larger cracks. It is recommended that initial treatment with chemical admixture can stimulate and heal further cracks and it has the better repeatability trend in mixing with the concretes and mechanical recovery is possible even under repetitive preloading. Effective self-healing with chemical admixtures even under open-air exposure, leads to study the importance of a service ability design parameter including the maximum allowable crack width by repeatability analysis as a function of the exposure with the concept of sealable crack width.

关键词： crystalline admixture permeability reducer admixture cracking

Structural,Wettability and Optical Investigation of Titanium Oxynitride Coatings:Effect of Various Sputtering Parameters

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Journal of Materials Science & Technology 2012年第6期28卷 512-523页

作者： Sushant K Rawal Amit Kumar Chawla R.Jayaganthan Ramesh chandra Centre of Nanotechnology Indian Institute of Technology RoorkeeRoorkee-247667India Nano Science Laboratory Institute Instrumentation CentreIndian Institute of Technology RoorkeeRoorkee-247667India Department of Mechanical Engineering Charotar University of Science and TechnologyChanga 388421India Department of Physics University of Petroleum and Energy StudiesDehradun-48007India Department of Metallurgical and Materials Engineering Indian Institute of Technology RoorkeeRoorkee-247667India

The objective of the present work is to investigate the effect of various sputtering parameters such as nitrogen flow rate, deposition time and sputtering pressure on structural, wettability and optical properties of titanium oxynitride films deposited on glass substrate by reactive magnetron sputtering. The X-ray diffraction graphs of titanium oxynitride films show evolution of various textures of TiO=N and TiN phases with increasing nitrogen flow rate and deposition time, but an increase in sputtering pressure from 4.0 to 8.0 Pa results in decline of various textures observed for TiO=Ny and TiN phases. The stress and strain calculated by sin2~ method are compressive, which decrease with increasing nitrogen flow rate from 55 to I00 sccm （standard cubic centimeter per minute） and increase with increasing deposition time from 80 to I40 min due to atomic penning effect and increasing thickness of the deposited films. The titanium oxynitride films have contact angle values above 90 deg., indicating that films are hydrophobic. The maximum contact angle of I09.1 deg. is observed at deposition time of 140 min. This water repellent property can add value to potential protective, wear and corrosion resistant application of titanium oxynitride films. The band gap decreases from 1.98 to 1.83 eV as nitrogen flow rate is increased from 55 to 100 sccm; it decreases from 1.93 to 1.79 eV as deposition time is increased from 80 to 140 min as more nitrogen incorporation results in higher negative potential of valence band N2p orbital. But it increases from 2.26 to 2.34 eV for titanium oxynitride films as sputtering pressure increases from 4.0 to 8.0 Pa.

关键词： Titanium oxynitride Sputtering parameters Contact angle Optical properties

Roles of computational modelling in understanding p53 structure, biology, and its therapeutic targeting

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Journal of Molecular Cell Biology 2019年第4期11卷 306-316页

作者： Yaw Sing Tan Yasmina Mhoumadi chandra S. Verma Bioinformatics Institute Agency for Science Technology and Research Singapore 138671 School of Biological Sciences Nanyang Technological University Singapore 637551 Department of Biological Sciences National University of Singapore Singapore 117543

The transcription factor p53 plays pivotal roles in numerous biological processes, including the suppression of tumours. The rich availability of biophysical data aimed at understanding its structure–function relationships since the 1990s has enabled the application of a variety of computational modelling techniques towards the establishment of mechanistic models. Together they have provided deep insights into the structure, mechanics, energetics, and dynamics of p53. In parallel, the observation that mutations in p53 or changes in its associated pathways characterize several human cancers has resulted in a race to develop therapeutic modulators of p53, some of which have entered clinical trials. This review describes how computational modelling has played key roles in understanding structural-dynamic aspects of p53, formulating hypotheses about domains that are beyond current experimental investigations, and the development of therapeutic molecules that target the p53 pathway.

关键词： p53 structure computational modelling therapeutic targeting

Extraction of locked-up coal by strengthening of rib pillars with FRP--A comparative study through numerical modelling

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International Journal of Mining Science and Technology 2017年第2期27卷 261-267页

作者： Das Arka Jyoti Mandal Prabhat Kumar Ghosh chandra Nath Sinha Amalendu CSIR-Central Institute of Mining and Fuel Research Dhanbad 826001India

In some of the coalfields in India, coal seams are only developed but no extraction of pillars is possible due to the presence of surface or sub-surface structures and also non-availability of stowing materials which leads to huge amounts of coal being locked-up underground. Spontaneous heating and fire, accumulation of poisonous gases, severe stability issues leading to unsafe workings and environmental hazards are the major problems associated with the developed coal pillars. So, there is a pressing need for a technology for the mining industry to extract the huge amount of coal locked-up under different constraints. In this study, the locked-up coal is proposed to be extracted by artificially strengthening the rib pillars. The detailed comparative study is carried out to know the increase of extraction percentage of locked-up coal by strengthening the rib pillars with FRP. Extraction methodology is designed and studied through numerical modelling for its stability analysis to evaluate its suitability of application in underground.

关键词： Locked-up coal Confined core Yield criterion Strengthened rib pillar Strain softening