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Er^(3+)-Yb^(3+)-Na^(+):ZnWO_(4) phosphors for enhanced visible upconversion and temperature sensing applications

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Journal of Rare Earths 2021年第3期39卷 291-296,I0002页

作者： Sonali Biswas lakshmi mukhopadhyay Manisha Mondal Vineet Kumar Rai Laser and Spectroscopy Laboratory Department of PhysicsIndian Institute of Technology(Indian School of Mines)Dhanbad-826004JharkhandIndia

The crystal structure and surface morphology of the Er^(3+)/Yb^(3+)/Na+:ZnWO_(4) phosphors synthesized by solid state reaction method were analyzed by X-ray diffraction(XRD) and field emission scanning electron microscopy(FESEM) *** frequency upconversion(UC) emission study in the developed phosphors was investigated by using 980 nm laser diode *** effect of codoping in the Er^(3+):ZnWO_(4) phosphors on the UC emission intensity was *** UC emission bands that are exhibited in the blue(490 nm),green(530,552 nm),red(668 nm) and NIR(800 nm) region correspond to the ^(4)F_(7/2)→^(4)I_(15/2).^(2)H_(11/2),^(4)S_(3/2)→^(4)I_(15/2),^(4)F_(9/2)→^(4)I_(15/2) and ^(4)I9/2→^(4)I_(15/2) transitions,*** temperature sensing performance of the Er^(3+)-Yb^(3+)-Na+:ZnWO_(4) phosphors was investigated based on the 2 H_(11/2)→^(4)I_(15/2) and ^(4)S_(3/2)→^(4)I_(15/2) thermally coupled transitions of the Er^(3+)*** photometric study was also carried out for the developed phosphors.

关键词： Upconversion Non-lanthanides Temperature sensing Fluorescence intensity ratio Rare earths

Implementation of all-optical tristate Pauli X, Y and Z gates based on two-dimensional photonic crystal

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Optoelectronics Letters 2024年第6期20卷 346-352页

作者： Snigdha Hazra Sourangshu mukhopadhyay Department of Physics The University of BurdwanBurdwan 713104India1

In this paper, we have designed and simulated all-optical tristate Pauli X, Y and Z gates using 2D photonic crystal. Simple line and point defects have been used to design the structure. The performance of the structure has been analyzed and investigated by plane wave expansion(PWE) and finite difference time domain(FDTD) methods. Different performance parameters, namely contrast ratio(CR), rise time, fall time, delay time, response time and bit rate, have been calculated. The main advantage of the proposed design is that all the Pauli gates have been realized from a single structure. Due to compact size, fast response time, good CR and high bit rate, the proposed structure can be highly useful for optical computing, data processing and optical integrated circuits.

关键词： Implementation of all-optical tristate Pauli X Y and Z gates based on two-dimensional photonic crystal

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可编程多物理机制的力学超材料

力学进展 2024年

作者： P.Sinha T.mukhopadhyay 印度理工学院航空工程系英国南安普顿大学工学院

力学超材料是一种有别于传统力学行为的工程材料，它源于人工可编程的微结构以及材料的固有属性。在过去的十年中，随着计算性能和复杂微观结构制造能力的巨大进步，力学超材料已经吸引了研究人员的广泛关注，因为它能够实现自然界中不... 详细信息

力学超材料是一种有别于传统力学行为的工程材料，它源于人工可编程的微结构以及材料的固有属性。在过去的十年中，随着计算性能和复杂微观结构制造能力的巨大进步，力学超材料已经吸引了研究人员的广泛关注，因为它能够实现自然界中不可能出现的多重物理属性。该领域迅速崛起的趋势之一是将材料行为和单元结构与其他不同的多种物理因素(如电场或磁场)以及温度、光或化学反应等刺激相结合，从而扩大按需主动调制力学响应的范围。在本文中，我们旨在概述有关超材料的力学和多物理性质调制的相关文献，重点介绍双能级设计的新兴趋势，着重讨论力学超材料在关键工程领域应用中的巨大潜力。本文对该领域的发展趋势、挑战和未来路线进行了系统深入分析，涵盖实时可重构性和功能编程、4D打印、纳米超材料、人工智能和机器学习、多物理折纸/剪纸、活性物质、软物质和保形超材料、复杂微结构制造、服役寿命效应和可扩展性等概念。

关键词：力学超材料按需特性调制多物理力学可编程物质双级点阵主动超材料刺激响应材料

Prevalence and impact of diabetes and prediabetes on presentation and complications of primary hyperaldosteronism at diagnosis

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World Journal of Clinical Cases 2024年第18期12卷 3332-3339页

作者： Debmalya Sanyal Pradip mukhopadhyay Sujoy Ghosh Department of Endocrinology NHRTIICS&KPC Medical CollegeKolkata 700032West BengalIndia Department of Endocrinology IPGME&R and SSKM HospitalKolkata 700020West BengalIndia Department of Endocrinology IPGME&RKolkata 700020West BengalIndia

BACKGROUND Primary hyperaldosteronism(PH)is considered to contribute to increased risk of developing type 2 diabetes mellitus(T2DM)and *** PH and DM are associated with increased risk for hypertension,cardiovascular diseases,and chronic kidney ***,data on prevalence of T2DM and prediabetes in PH,and impact of T2DM and prediabetes on presentation and cardio renal complications in PH at presentation is *** To determine the prevalence of T2DM and prediabetes in PH at diagnosis and impact on presentation and complications of *** A retrospective cohort study was conducted in tertiary care settings in individuals with confirmed diagnosis of PH at *** variables,clinical presentations,duration and degree of hypertension,complications,laboratory parameters including sodium,potassium levels,plasma aldosterone concentration(PAC),plasma renin activity(PRA),and aldosterone to renin ratio(ARR)and cardio-renal parameters were *** was done between three groups:PH with no DM(Group A)or with pre-diabetes(Group B)or with T2DM(Group C).P<0.05 was statistically *** Among 78 individuals with confirmed PH,62%had pre-diabetes or diabetes;with 37%having *** duration of T2DM was 5.97±4.7 *** mean levels of glycaemic parameters among the group A vs B vs C individuals were fasting plasma glucose(mg/dL):87.9±6.5,105.4±9.02,130.6±21.1;post prandial plasma glucose(mg/dL):122.7±9.8,154.9±14,196.7±38.0;glycated haemoglobin(%)(5.3±0.2,5.9±0.2,7.5±0.6,P<0.05),*** was no significant difference in the biochemical parameters(PAC,PRA,ARR,sodium,potassium levels),presentation and complications between the *** renal parameters or degree and duration of hypertension were comparable between the *** Significant prevalence of T2DM and prediabetes in PH at diagnosis does not impact its presentation or *** screening for undetected PH in T2DM and prediabete

关键词： Primary hyperaldosteronism Diabetes Prediabetes Hypertension Aldosterone Aldosterone to renin ratio

Liquid ordering induced heterogeneities in homogeneous nucleation during solidification of pure metals

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Journal of Materials Science & Technology 2022年第11期106卷 77-89页

作者： Avik Mahata Tanmoy mukhopadhyay Mohsen Asle Zaeem School of Engineering Brown UniversityProvidenceRI02912USA Department of Engineering Science University of OxfordOxfordOX13PJUK Department of Aerospace Engineering Indian Institute of Technology KanpurKanpurIndia Department of Mechanical Engineering Colorado School of MinesCO80401USA

Homogeneous crystal nucleation is prone to formation of defects and often experiences heterogeneities,the inferences of which are crucial in processing crystalline materials and controlling their physical properties. It has been debated in literature whether the associated heterogeneities are an integral part of the homogenous nucleation. In this study by integrating a probabilistic approach with large-scale molecular dynamics simulations based on the most advanced high-temperature interatomic potentials, we attempt to address the ambiguity over the sources and mechanisms of heterogeneities in homogenous nucleation during solidification of pure melts. Different classes of structured metals are investigated for this purpose,including face-centered cubic aluminum, body-centered cubic iron, and hexagonal close-packed magnesium. The results reveal, regardless of the element type or the solidified crystal structure, that the densification process of liquid metals is accompanied by short-range orderings of atoms prior to the formation of crystals, controlling the heterogeneities during homogenous nucleation.

关键词： Homogeneous nucleation Heterogeneity Solidification Metals Molecular dynamics simulation Probability density

Implementation of quantum optical tristate CNOT gate using frequency encoding principle with a semiconductor optical amplifier

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Optoelectronics Letters 2023年第5期19卷 269-273页

作者： Snigdha Hazra Sourangshu mukhopadhyay Department of Physics The University of BurdwanBurdwan 713104India

Controlled NOT(CNOT)gate is well known because of its several advantages in quantum computing and information *** the area of quantum computing,several methods of CNOT gates were established in last few *** this paper,we propose a new approach of implementation of tristate CNOT operation with light as information carrying *** do this,the frequency encoding method has been exploited for successful realization of the CNOT gate with light.

关键词： quantum realization tris

Microstructural image based convolutional neural networks for efficient prediction of full-field stress maps in short fiber polymer composites

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Defence Technology（防务技术） 2023年第6期24卷 58-82页

作者： S.Gupta T.mukhopadhyay V.Kushvaha Department of Civil Engineering Indian Institute of Technology JammuJ&KIndia Department of Aerospace Engineering Indian Institute of Technology KanpurUPIndia

The increased demand for superior materials has highlighted the need of investigating the mechanical properties of composites to achieve enhanced constitutive ***-reinforced polymer composites have emerged as an integral part of materials development with tailored mechanical ***,the complexity and heterogeneity of such composites make it considerably more challenging to have precise quantification of properties and attain an optimal design of structures through experimental and computational *** order to avoid the complex,cumbersome,and labor-intensive experimental and numerical modeling approaches,a machine learning(ML)model is proposed here such that it takes the microstructural image as input with a different range of Young’s modulus of carbon fibers and neat epoxy,and obtains output as visualization of the stress component S11(principal stress in the x-direction).For obtaining the training data of the ML model,a short carbon fiberfilled specimen under quasi-static tension is modeled based on 2D Representative Area Element(RAE)using finite element *** composite is inclusive of short carbon fibers with an aspect ratio of 7.5that are infilled in the epoxy systems at various random orientations and positions generated using the Simple Sequential Inhibition(SSI)*** study reveals that the pix2pix deep learning Convolutional Neural Network(CNN)model is robust enough to predict the stress fields in the composite for a given arrangement of short fibers filled in epoxy over the specified range of Young’s modulus with high *** CNN model achieves a correlation score of about 0.999 and L2 norm of less than 0.005 for a majority of the samples in the design spectrum,indicating excellent prediction *** this paper,we have focused on the stage-wise chronological development of the CNN model with optimized performance for predicting the full-field stress maps of the fiber-reinforced composite ***

关键词： Micromechanics of fiber-reinforced composites Machine learning assisted stress prediction Microstructural image-based machine learning CNN based stress analysis

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

Reconnaissance investigation of geothermal resources in parts of the Middle Benue Trough, Nigeria using remote sensing and geophysical methods

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Energy Geoscience 2022年第4期3卷 360-371页

作者： Tochukwu Ngene Manoj mukhopadhyay Suame Ampana Department of Applied Physics Papua New Guinea University of TechnologyLaePrivate Mail BagLae411MorobePapua New Guinea

In Nigeria,the basement complex and the sedimentary basins house many thermal springs which are physical manifestations of geothermal ***,there are difficulties in accessing the sustain-ability of these resources due to ethical and security issues as well as limited data in ***,identifying the precise location,temperature,and energy potential on a large scale has been a major *** paper is the preliminary investigation of geothermal potential in parts of the Middle Benue Trough using satellite imagery,geology,regional gravity,and high-resolution aeromagnetic *** 8 scene was used to estimate the Land Surface Temperature(LST)in ArcGIS^(TM).Selected sites were classified as very low,low,moderate,and high *** intermediate and high classes happen to be possible geothermal zones,and they occupy 49% of the study area(38,077 km^(2)).The Riverline was superimposed on the LST,and the high-temperature sites were located by the identification ***/river data overlapped on the selected sites were regarded as thermal/warm ***,the LST results show lower temperatures(<36℃)at the famous thermal springs(Awe and Wukari)than some unknown rivers/streams found in Kwande(38℃),Ussa,(38℃),Gwer East(37℃),Yola Cross and Ogoja(36℃).Furthermore,the geophysical datasets,regional gravity,and high-resolution aeromagnetic data were interpolated to delineate the subsurface features associated with geothermal *** four layers from the LST were further evaluated using the geophysical *** and mag-netic values revealed variations that could be linked to geothermal *** correlation of the geophysical anomalies and LST with the geology of the study area uncovers essential information on energy ***,further investigation is required to estimate the depth of the causative body,the geothermal gradients,and the reservoir volumes.

关键词： ArcMap Gravity and magnetic methods Geothermal resources Landsat 8 Land surface temperature