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Enhanced in-vitro degradation resistance and cytocompatibility of a thermomechanically processed novel Mg alloy:Insights into the role of microstructural attributes

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Journal of Magnesium and Alloys 2024年第2期12卷 700-725页

作者： darothi bairagi Santanu Mandal Mangal Roy Manas Paliwal Sumantra Mandal Department of Metallurgical and Materials Engineering Indian Institute of TechnologyKharagpur 721302India

The role of microstructural features on in-vitro degradation and surface film development of a thermomechanically processed Mg-4Zn-0.5Ca-0.8Mn alloy has been investigated employing electrochemical studies,scanning electron microscopy and X-ray photoelectron *** specimen forged at 523 K temperature developed a coarse unimodal microstructure consisting of basal oriented grains,whereas the specimens forged at 623 K and 723 K temperatures exhibited bimodal microstructures containing randomly oriented fine grains and basal oriented coarse *** bimodal microstructures exerted higher resistance to corrosion compared to the unimodal microstructure in presence of a protective surface *** optimum size distribution of fine and coarse grains as well as the prevalence of basal oriented grains led to the lowest anodic current density in the specimen forged at 623 *** morphology of Ca_(2)Mg_(6)Zn_(3)precipitates governed the cathodic kinetics by controlling the anode to cathode surface area *** the specimen forged at 723 K comprised comparatively lower fraction of precipitates than at 623 K,the mesh-like precipitate morphology increased the effective cathodic surface area,leading to enhanced localised corrosion in the former *** microstructural features developed at 623 K forging temperature formed a well-protective surface film with lower Mg(OH)_(2)to MgO ratio,exhibiting distinctly high polarization resistance and superior cytocompatibility in terms of cell-proliferation and cell-differentiation.

关键词： Magnesium alloy Microstructure Corrosion Electrochemical impedance spectroscopy X-ray photoelectron spectroscopy Cytotoxicity

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A comprehensive review on biocompatible Mg-based alloys as temporary orthopaedic implants:Current status,challenges,and future prospects

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Journal of Magnesium and Alloys 2022年第3期10卷 674-722页

作者： darothi bairagi Sumantra Mandal Department of Metallurgical and Materials Engineering Indian Institute of TechnologyKharagpur 721302India

Mg and its alloys are drawing huge attention since the last two decades as a viable option for temporary implants applications.A commendable progress has already been made in the development of these *** biodegradable nature of Mg,appreciable biocompatibility of elemental Mg,and its close resemblance to natural bone in terms of density and elastic modulus make them highly preferable option amongst other available alternatives in this *** review article presents an overview covering the recent advancements made in the field of Mg-based biodegradable implants for orthopaedic implant *** paper focuses on alloy development and fabrication techniques,the state of the art of important Mg-based alloy systems in terms of their mechanical properties,in-vitro and in-vivo degradation behaviour and ***,the paper reviews the current progress achieved in the clinical transition of Mg-based alloys for orthopaedic *** review also includes the degradation mechanisms of the alloys in physiological environment and highlights the mismatch existing between the rate of bone healing and alloy degradation due to rapid corrosion of the alloys in such environment,which has still restricted their widespread ***,the surface coating techniques available for the alloys as an effective way to reduce the degradation rate are reviewed,followed by a discussion on the future research prospects.

关键词： Mg-based alloys Biomaterials Temporary implants Biocompatibility Degradation behaviour orthopaedic fixtures.

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Influence of second phase precipitates on mechanical and in-vitro corrosion behaviour of Mg-4Zn-0.5Ca-0.8Mn alloy in optimum homogenized conditions

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Journal of Magnesium and Alloys 2023年第4期11卷 1343-1366页

作者： darothi bairagi Partha Duley Manas Paliwal Sumantra Mandal Department of Metallurgical and Materials Engineering Indian Institute of Technology Kharagpur721302India

The present study investigates the mechanical and in-vitro corrosion behavior of Mg-4Zn-0.5Ca-0.8Mn alloy in optimum homogenized *** optimization of the homogenization parameters has been carried out employing thermodynamic calculations and kinetic *** model utilizes the inter-diffusivity of the solute elements and predicts that∼6–24 h of homogenization at 633 K effectively redistributes the elements in the Mg *** on the insights obtained from the simulations,the as-cast Mg-4Zn-0.5Ca-0.8Mn alloy was subjected to homogenization heat treatment process for 6–*** microstructural study through optical microscopy and scanning electron microscopy(SEM)revealed that the interconnected network of second phase precipitates substantially dissolve within 24 h,implying adequate ***,fine Mg-Zn based precipitates with varied morphology and phase fractions also evolved during homogenization treatment,as confirmed through SEM and transmission electron *** the 12 h homogenized specimen,the highest fraction of uniformly dispersed fine precipitates resulted in the highest strength(∼225 MPa).On the other hand,a substantial disruption in coarse precipitate network and lower aspect ratio of fine Mg-Zn precipitates led to the highest ductility(∼8%)in this *** the 24 h homogenized specimen,the ductility reduced marginally owing to higher aspect ratio of fine *** immersion and electrochemical tests(viz.,potentiodynamic polarization and electrochemical impedance spectroscopy)carried out in Hank’s solution revealed that the 24 h homogenized specimen exhibits the best corrosion *** least fraction of Ca_(2)Mg_(6)Zn_(3)phase with maximum disruption in interconnectivity,in combination with a small fraction of fine equilibrium MgZn_(2)precipitates,resulted in suppression of localized corrosion in this *** promotes the formation of the most stable and compact product layer over the specimen,result

关键词： Mg alloy Thermodynamic-kinetic calculation Homogenization EIS Passive film

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Spatially explicit estimation of soil organic carbon stock of an estuarine mangrove wetland of eastern India using elemental analysis and very-fine resolution satellite data

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Ecological Processes 2022年第1期11卷 411-426页

作者： Debajit Datta Madhumita bairagi Mansa Dey Argha Pratim Pal Jibananda Gayen Department of Geography Jadavpur UniversityKolkata 700032India Department of Geography Sree Chaitanya CollegeHabra 743268India

Background:This study estimated the total soil organic C(SOC)stock of the wetland influence zone of Bichitrapur mangroves in eastern India in a spatially explicit *** spatial and vertical distribution of SOC densities with respect to land use/land cover(LULC)pattern were ***,some site-specific management strate-gies were forwarded towards enhancement of C sequestration ***:The changing patterns of LULC within the wetland influence zone of the site were analyzed using Landsat TM(30 m)and Pleiades-1A(2 m)imageries from 1988 to ***-specific SOC measurement was done using samples taken from four core-depth intervals(viz.D1:0–20 cm,D2:20–40 cm,D3:40–70 cm,D4:70–100 cm)at 89 locations belonging to different LULC *** interpolation was applied on this point-based data to produce SOC density and stock models as a whole and at all *** between SOC density,core-depth and present LULC were evaluated through multivariate statistical ***:The LULC transformations during last three decades suggested the gradual growth of mangrove plantations as well as agricultural and aquacultural *** amount of SOC was concentrated in D1(37.17%)followed by D3(26.51%),while D4 had the lowest(10.87%).The highest mean SOC density was observed in the dense mangrove patches(248.92 Mg ha^(−1))and the lowest mean was in the Casuarina plantations(2.78 Mg ha^(−1)).Here,Spline method emerged as the best-fit interpolation technique to model SOC data(R^(2)=0.74)and estimated total SOC stock of the entire wetland influence zone as 169,569.40 Mg and the grand mean as 125.56 Mg ha^(−1).Overall,LULC was inferred as a major determinant of SOC dynamics with a statistically significant effect(p<0.001),whereas no such inference could be drawn for soil ***:The C sequestration potential of sites such as the present one could be increased with appropriate zone-wise plantation strategies,restrict

关键词： Blue C density Core-depth Coastal wetland Dry combustion Land use conversion Wetland influence zone

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An Improved Encoder-Decoder CNN with Region-Based Filtering for Vibrant Colorization

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Computer Systems Science & Engineering 2023年第7期46卷 1059-1077页

作者： Mrityunjoy Gain Md Arifur Rahman Rameswar Debnath MrimMAlnfiai Abdullah Sheikh Mehedi Masud Anupam Kumar bairagi Computer Science and Engineering Discipline Khulna UniversityKhulna 9208Bangladesh Department of Information Technology College of Computers and Information TechnologyTaif UniversityTaif 21944Saudi Arabia Department of Computer Science College of Computers and Information TechnologyTaif UniversityTaif 21944Saudi Arabia

Colorization is the practice of adding appropriate chromatic values to monochrome photographs or videos.A real-valued luminance image can be mapped to a three-dimensional color ***,it is a severely ill-defined problem and not has a single *** this paper,an encoder-decoder Convolutional Neural Network(CNN)model is used for colorizing gray images where the encoder is a Densely Connected Convolutional Network(DenseNet)and the decoder is a conventional *** DenseNet extracts image features from gray images and the conventional CNN outputs a^(*)b^(*)color *** to a large number of desaturated color components compared to saturated color components in the training images,the saturated color components have a strong tendency towards desaturated color components in the predicted a^(*)b^(*)*** solve the problems,we rebalance the predicted a^(*)b^(*)color channel by smoothing every subregion individually using the average filter.2 stage k-means clustering technique is applied to divide the *** we apply Gamma transformation in the entire a^(*)b^(*)channel to saturate the *** compare our proposed method with several existing *** the experimental results,we see that our proposed method has made some notable improvements over the existing methods and color representation of gray-scale images by our proposed method is more plausible to ***,our suggested approach beats other approaches in terms of Peak Signal-to-Noise Ratio(PSNR),Structural Similarity Index Measure(SSIM)and Histogram.

关键词： Colorization DenseNet desaturation k-means

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Wind environment around the setback building models

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Building Simulation 2021年第5期14卷 1525-1541页

作者： Amlan Kumar bairagi Sujit Kumar Dalui Department of Civil Engineering Indian Institute of Engineering Science and TechnologyShibpurHowrahIndia

The irregular shape of buildings always tenders an enormous challenge to the *** wind velocity at the pedestrian level has a specific approach from a comfortable point of *** investigation highlighted the characteristic of the pedestrian level wind velocity for distinct types of asymmetrical setback *** passed study explored the pedestrian level effect for the axisymmetric models,while this study is based on the models that have symmetry about a single *** study investigates the pedestrian level flow fluctuation of setback models with single and double side setbacks at multiple *** double-side double setback buildings are efficient to reduce 28%-30%velocity in front of the building and 68%-70%velocity behind the *** it suggests that the double side double setback building is efficient to maintain the velocity at the pedestrian level,roof level,and backside of the *** setback building can easily control the frequency of fluctuating velocity at downstream flow for both along and across wind conditions.

关键词： amplification factor pedestrian level flow setback model velocity spectra wind environment computational fluid dynamics(CFD)

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Unmanned Aerial Vehicle Assisted Forest Fire Detection Using Deep Convolutional Neural Network

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Intelligent Automation & Soft Computing 2023年第3期35卷 3259-3277页

作者： A.K.Z Rasel Rahman S.M.Nabil Sakif Niloy Sikder Mehedi Masud Hanan Aljuaid Anupam Kumar bairagi Computer Science and Engineering Discipline Khulna UniversityKhulna 9208Bangladesh Department of Computer Science College of Computers and Information TechnologyTaif UniversityTaif 21944Saudi Arabia Computer Sciences Department College of Computer and Information SciencesPrincess Nourah Bint Abdulrahman University(PNU)Riyadh 11671Saudi Arabia

Disasters may occur at any time and place without little to no presage in *** the development of surveillance and forecasting systems,it is now possible to forebode the most life-threatening and formidable ***,forestﬁres are among the ones that are still hard to anticipate beforehand,and the technologies to detect and plot their possible courses are still in *** Aerial Vehicle(UAV)image-basedﬁre detection systems can be a viable solution to this ***,these automatic systems use advanced deep learning and image processing algorithms at their core and can be tuned to provide accurate ***,this article proposed a forestﬁre detection method based on a Convolutional Neural Network(CNN)architecture using a newﬁre detection ***,our method also uses separable convolution layers(requiring less computational resources)for immediateﬁre detection and typical convolution ***,making it suitable for real-time ***,after being trained on the dataset,experimental results show that the method can identify forestﬁres within images with a 97.63%accuracy,98.00%F1 Score,and 80%***,if deployed in practical circumstances,this identiﬁcation method can be used as an assistive tool to detectﬁre outbreaks,allowing the authorities to respond quickly and deploy preventive measures to minimize damage.

关键词： Forestﬁre detection UAV CNN machine learning

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Role of precautionary measures in HIV epidemics： A mathematical assessment

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International Journal of Biomathematics 2016年第6期9卷 307-331页

作者： N. bairagi D. Adak Center for Mathematical Biology and Ecology Department of Mathematics Jadavpur University Kolkata 700032 India

United Nations Political Declaration 2011 on HIV and AIDS calls to reduce the sexual transmission and the transmission of HIV among people, who inject drugs by 5 0 % by 2015, through different control strategies and precautionary measures. In this paper, we propose and study a simple SI type model that considers the effect of various precautionary measures to control HIV epidemic. We show, unlike conventional epidemic models, that the basic reproduction number which essentially considered as the disease eradication condition is no longer sufficient to eliminate HIV infection. In particular, we show that even when the basic reproduction number is made less than unity, the disease may persist if the initial outbreak is not low. Eradication of disease is however guaranteed if the ensemble control measure exceeds some upper critical value. It is also shown that an epidemic model with mass action incidence may exhibit backward bifurcation and bistability if density-dependent demography is considered. Our theoretical study thus indicates that extra attention should be given in controlling HIV epidemic to achieve the desired result.

关键词：艾滋病毒预防效果数学评价传染病模型控制策略流行病模型密度依赖性传播

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Negative Imaginary Approached High Performance Robust Resonant Controller Design for Single-Phase Islanded Microgrid and Its Voltage Observation on Different Load Condition

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Intelligent Control and Automation 2018年第2期9卷 52-63页

作者： Arnob Kumar bairagi Ahasan Habib Rakib Rahman Motiur Rahman Moniruzzaman Jewel Department of Electrical and Electronic Engineering Rajshahi University of Engineering & Technology Rajshahi Bangladesh Department of Electrical and Electronic Engineering Bangladesh Army University of Engineering & Technology Natore Bangladesh Institute of Information and Technology Jahangirnagar University Savar Bangladesh

This paper presents the design of a high performance robust resonant controller for the islanded single-phase microgrid operation on different loads conditions. The design of the controller is done using the results of Negative Imaginary approach. The performance of the proposed controller has been found much effective to track the instantaneous reference grid voltage. The simulation work has been done with the help of MATLAB/SimPower System toolbox. This shows that the proposed controller provides effective control of voltage against the uncertain load conditions.

关键词： Controller Design Islanded Microgrid Robust Voltage Control

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HOW SELF-PROLIFERATION OF CD4＋T CELLS AFFECT THE HIV DYNAMICS IN AN IN-HOST TARGET-CELL LIMITED HIV MODEL WITH SATURATION INFECTION RATE： A QUASI-STEADY-STATE APPROXIMATION ANALYSIS

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International Journal of Biomathematics 2013年第2期6卷 61-104页

作者： N. bairagi D. ADAK Center for Mathematical Biology and EcologyDepartment of Mathematics Jadavpur University Kolkata 700032 India

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