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Influence of ionic radius of rare-earths on the structural and electrical properties of Ba_5RTi_3Nb_7O_(30)(R=rare-earth) ferroelectric ceramics

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Journal of Rare Earths 2015年第12期33卷 1310-1315页

作者： prasun Ganguly Department of Physics National Defence Academy

In the present report, BasRTi3Nb7030 （R=La, Nd, Sm, Eu, Dy） compounds were synthesized by solid-state reaction method in order to know the effect of ionic radius of rare-earths on their structural, dielectric, ferroelectric, pyroelectric, piezoelectric and con- ductive properties. X-ray diffraction analysis revealed the formation of the compounds having orthorhombic structure. Scanning elec- tron micrographs showed the formation of fine granular microstructure in all the compounds with a decrease in the average grain size with increasing ionic radius of the substituted rare-earths. Detailed dielectric studies showed that the dielectric constant （er） increased while Curie temperature （To） decreased as the ionic radius of the rare-earths increased. With the decrease in the ionic radius of the rare-earths, remanent polarization （2Pr）, piezoelectric （d33） and pyroelectric coefficients were observed to increase in BasRTi3Nb7030 compounds. The temperature variation of dc conductivity suggested that the compounds had negative temperature coefficient of re- sistance （NTCR） behaviour.

关键词： ceramics ferroelectrics solid-state reaction dielectric response piezoelectricity rare earths

Estimating statistics of sky brightness using radio interferometric observations

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Research in Astronomy and Astrophysics 2019年第4期19卷 119-136页

作者： prasun Dutta Meera Nandakumar Department of Physics IIT (BHU) Varanasi

Radio interferometers are used to construct high resolution images of the sky at radio frequencies and are the key instruments for accessing the statistical properties of the evolution of neutral hydrogen over cosmic time. Here we use simulated observations of the model sky to assess the efficacy of different estimators of the large-scale structure and power spectrum of the sky brightness distribution. We find that while the large-scale distribution can be reasonably estimated using the reconstructed image from interferometric data, estimates of the power spectrum of the intensity fluctuations calculated from the image are generally biased. This bias is found to be more pronounced for diffuse emission. The visibility based power spectrum estimator, however, gives an unbiased estimate of the true power spectrum. This work demonstrates that for an observation with diffuse emission the reconstructed image can be used to estimate the large-scale distribution of the intensity, while to estimate the power spectrum, visibility based methods should be *** the upcoming experiments aimed at measuring the evolution of the power spectrum of the neutral hydrogen distribution, this is a very important result.

关键词： instrumentation:interferometers methods:data analysis techniques:interferometric

Evolution of landscape in a piedmont section of Eastern Himalayan foothills along India-Bhutan border: A tectono-geomorphic perspective

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Journal of Mountain Science 2019年第12期16卷 2828-2843页

作者： Chandreyee CHAKRABARTI GOSWAMI prasun JANA John C WEBER Department of Geology University of Calcutta35Ballygunge Circular RoadKolkata 700029India Geological Survey of India Northern RegionSector ELucknow 226024India Department of Geology Grand Valley State University1 Campus DriveAllendaleMI 49401 USA

The present study area involves part of a deformed coalesced fan located along the Himalayan Frontal Thrust(HFT)on the east of river Tista near the India-Bhutan *** area is marked by two spectacular E-W trending south-sloping scarps namely the Matiali(ca.60 m)and Chalsa(ca.90 m)Scarps and a north-sloping E-W trending Thaljhora(ca.80 m)*** work comprises of a comparative study of geomorphology and geologic history in the adjacent interfluves of Jaldhaka-Gathia and Neora-Murti rivers to understand the tectonic history of the *** mapped the Jaldhaka-Gathia river interfluve at a 1:25,000 scale and report a hitherto unidentified northerly sloping small scarp of ca.5 m height named the Nagrakata *** scarp was identified using satellite images,DEMs,and total station *** interpret that the two northsloping,E-W trending scarps(Thaljhora and Nagrakata Scarps)are manifestations of steep limbs of anticlines over blind south-dipping back *** they form a wrinkle-ridge pair behind the north-dipping HFT,which is manifested by south-sloping Chalsa *** propose a plausible geomorphic model interpreting that deformation along the small fan in the Jaldhaka-Gathia interfluves is younger compared to fan deposition and deformation in the adjacent Mal-Murti *** most recent geomorphology of the Jaldhaka-Gathia interfluve is controlled by tectonism associated with the thrust below the Nagrakata Scarp where the youngest deformation episode is recorded to at around^6 ka and is likely related to motion on a splay off of the thrust beneath the Thaljhora Scarp.

关键词： Eastern Himalayas Thaljhora Scarp Nagrakata Scarp Drainage Back-thrust Wrinkle-ridge

Graphology based handwritten character analysis for human behaviour identification

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CAAI Transactions on Intelligence Technology 2020年第1期5卷 55-65页

作者： Subhankar Ghosh Palaiahnakote Shivakumara prasun Roy Umapada Pal Tong Lu Indian Statistical Institute Kolkata 700108India Faculty of Computer Science and Information Technology University of Malaya50603 Kuala LumpurMalaysia National Key Lab for Novel Software Technology Nanjing University210093 NanjingPeople’s Republic of China

Graphology-based handwriting analysis to identify human behavior,irrespective of applications,is *** existing methods that use characters,words and sentences for behavioural analysis with human intervention,we propose an automatic method by analysing a few handwritten English lowercase characters from a to z to identify person *** proposed method extracts structural features,such as loops,slants,cursive,straight lines,stroke thickness,contour shapes,aspect ratio and other geometrical properties,from different zones of isolated character images to derive the hypothesis based on a dictionary of Graphological *** derived hypothesis has the ability to categorise the personal,positive,and negative social aspects of an *** evaluate the proposed method,an automatic system is developed which accepts characters from a to z written by different individuals across different genders and age *** automatic privacy projected system is available on the website(http://***).For quantitative evaluation of the proposed method,several people are requested to use the system to check their characteristics with the system automatic response based on his/her handwriting by choosing to agree or disagree *** automatic system receives 5300 responses from the users,for which,the proposed method achieves 86.70%accuracy.

关键词： behaviour character analysis

Advancing Breast Cancer Diagnosis:The Development and Validation of the HERA-Net Model for Thermographic Analysis

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Computers, Materials & Continua 2024年第12期81卷 3731-3760页

作者： S.Ramacharan Martin Margala Amjan Shaik prasun Chakrabarti Tulika Chakrabarti School of Computing and Informatics University of LouisianaLafayetteLA 70504USA Computer Science and Engineering St.Peter’s Engineering CollegeHyderabad500100India Director Research and Dean International Affairs Sir Padampat Singhania UniversityUdaipur313601RajasthanIndia Department of Basic Sciences Sir Padampat Singhania UniversityUdaipur313601RajasthanIndia

Breast cancer remains a significant global health concern,with early detection being crucial for effective treatment and improved survival *** study introduces HERA-Net(Hybrid Extraction and Recognition Architec-ture),an advanced hybrid model designed to enhance the diagnostic accuracy of breast cancer detection by leveraging both thermographic and ultrasound imaging *** HERA-Net model integrates powerful deep learning architectures,including VGG19,U-Net,GRU(Gated Recurrent Units),and ResNet-50,to capture multi-dimensional features that support robust image segmentation,feature extraction,and temporal *** thermographic imaging,a comprehensive dataset of 3534 infrared(IR)images from the DMR(Database for Mastology Research)was utilized,with images captured by the high-resolution FLIR SC-620 *** dataset was partitioned with 70%of images allocated to training,15%to validation,and 15%to testing,ensuring a balanced approach for model development and *** prepare the images,preprocessing steps included resizing,Contrast-Limited Adaptive Histogram Equalization(CLAHE)for enhanced contrast,bilateral filtering for noise reduction,and Non-Local Means(NLMS)filtering to refine structural *** metrics such as mean,variance,standard deviation,entropy,kurtosis,and skewness were extracted to provide a detailed analysis of thermal distribution across ***,the ultrasound dataset was processed to extract detailed anatomical features relevant to breast cancer *** involved grayscale conversion,bilateral filtering,and Multipurpose Beta Optimized Bihistogram Equalization(MBOBHE)for contrast enhancement,followed by segmentation using Geodesic Active *** ultrasound and thermographic datasets were subsequently fed into HERA-Net,where VGG19 and U-Net were applied for feature extraction and segmentation,GRU for temporal pattern recognition,and ResNet-50 for *** performance assessme

关键词： Cancer breast cancer detection sensitivity deep learning accuracy

Frailty in end-stage liver disease:Understanding pathophysiology,tools for assessment,and strategies for management

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World Journal of Gastroenterology 2023年第46期29卷 6028-6048页

作者： Mazen Elsheikh Ahmed El Sabagh Islam B Mohamed Megha Bhongade Manal M Hassan prasun Kumar Jalal Department of Gastroenterology and Hepatology Baylor College of MedicineHoustonTX 77030United States Department of Epidemiology Division of Cancer Prevention and Population SciencesThe University of TexasMD Anderson Cancer CenterHoustonTX 77030United States

Frailty and sarcopenia are frequently observed in patients with end-stage liver *** is a complex condition that arises from deteriorations across various physiological systems,including the musculoskeletal,cardiovascular,and immune systems,resulting in a reduced ability of the body to withstand *** condition is associated with declined resilience and increased vulnerability to negative outcomes,including disability,hospitalization,and *** cirrhotic patients,frailty is influenced by multiple factors,such as hyperammonemia,hormonal imbalance,malnutrition,ascites,hepatic encephalopathy,and alcohol *** frailty is crucial in predicting morbidity and mortality in cirrhotic *** can aid in making critical decisions regarding patients’eligibility for critical care and ***,in turn,can guide the development of an individualized treatment plan for each patient with cirrhosis,with a focus on prioritizing exercise,proper nutrition,and appropriate treatment of hepatic complications as the primary lines of *** this review,we aim to explore the topic of frailty in liver diseases,with a particular emphasis on pathophysiology,clinical assessment,and discuss strategies for preventing frailty through effective treatment of hepatic ***,we explore novel assessment and management strategies that have emerged in recent years,including the use of wearable technology and telemedicine.

关键词： End-stage liver disease Frailty Liver cirrhosis Malnutrition Sarcopenia

Comparative Geochemical and Petrographic Studies of the Various Granitoids between Central and Western Arm, in the Central Part of Ramagiri Schist Belt and Their Petrogenetic Histories

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International Journal of Geosciences 2022年第5期13卷 382-413页

作者： Eirin Kar prasun Ghosh Shibani Mishra State Unit Andhra Pradesh Geological Survey of India Southern Region Hyderabad India

Granitoids between the central and western arm of Ramagiri schist belt in its central part, are broadly classified into the migmatite gneiss, grey granodiorite and pink monzogranite, based on field characteristics and petrographic features. These granitoids belong to the Tonalite-Granodiorite-Monzogranite (TGM) suite of PGC-II. All the samples are fresh as per the CIA values, PC1-PC2 binary plot and MFW ternary plot. The granodiorites occupy the expected field in the normative IUGS, TAS, and R1-R2 classification diagrams, but the monzogranites occupy the monzogranite field in the normative IUGS classification diagram and granite to alkali granite field in the rest. The granodiorites exhibit both ferroan to magnesian, alkali-calcic nature with metaluminous I type features and falls in the calc-alkaline to high K calc-alkaline series. They have high ΣREE (an average 327.905 ppm) content, and show LREE enrichment ((La/Sm)N = 3.1 - 6.8) with enriched but relatively flat HREE ((Gd/Yb)N = 1.75 - 5.26) patterns and weak negative to positive Eu anomaly (Eu/Eu* = 0.62 - 1.18). The monzogranites, on the other hand, are peraluminous, alkalic, ferroan, high K calc-alkaline, S-type granites, exhibiting relatively low ΣREE (an average 118.693 ppm) contents, strongly fractionated REE patterns with highly enriched LREE ((La/Sm)N =1.74 - 9.76), depleted HREE ((Gd/Yb)N = 0.43 - 2.21) patterns having concave upward shape, and strong negative Eu anomaly (Eu/Eu* = 0.23 - 0.89). Geothermobarometry revealed the average emplacement temperature and pressure of the granodiorites and monzogranites as 812.5℃, 8.14 ± 0.6 kbar and 775℃, 3.14 kbar, respectively. Based, on the observations, it can be concluded that the granodiorites have formed in volcanic arc setting by partial melting of the lower crust and S-type monzogranites have been produced at a relatively shallower depth in the crust, by continental crust recycl

关键词： Ramagiri Schist Belt Granodiorites Monzogranites Volcanic Arc

Significant increase in HBV, HCV, HIV and syphilis infections among blood donors in West Bengal, Eastern India 2004-2005: Exploratory screening reveals high frequency of occult HBV infection

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World Journal of Gastroenterology 2007年第27期13卷 3730-3733页

作者： prasun Bhattacharya Partha Kumar Chandra Sibnarayan Datta Arup Banerjee Subhashish Chakraborty Krishnan Rajendran Subir Kumar Basu Sujit Kumar Bhattacharya Runu Chakravarty Institute of Blood Transfusion Medicine and Immunohematology Kolkata India ICMR Virus Unit Kolkata India National Institute of Cholera and Enteric Diseases Kolkata India

AIM: To evaluate the prevalence of markers of hepatitis B virus (HBV) and hepatitis C virus (HCV) and human immunodeficiency virus (HIV) among blood donors in Kolkata, Eastern India for two consecutive years and to conduct a pilot study to explore the presence of HBV DNA among hepatitis B surface antigen (HBsAg) negative but anti-HBc positive blood donors. METHODS: Seroprevalence of HBsAg, anti-HCV and anti-HIV was studied among 113 051 and 106 695 voluntary blood donors screened in 2004 and 2005, respectively. Moreover, a pilot study on 1027 HBsAg negative donors was carried out for evaluating the presence of HBV DNA by PCR on HBsAg negative/anti- HBc positive donors. RESULTS: A statistically significant increase in the prevalence of HBV (1448 vs 1768, P < 0.001), HIV (262 vs 374, P < 0.001), HCV (314 vs 372, P = 0.003) and syphilis (772 vs 853, P = 0.001) infections was noted among blood donors of Kolkata West Bengal in 2005 as compared to 2004. Moreover, the exploratory study on 1027 HBsAg negative donors revealed that 188 (18.3%)of them were anti-HBc positive out of which 21% were positive for HBV DNA. CONCLUSION: The findings of this study underscore the significantly increasing endemicity of hepatitis viruses, syphilis and HIV among the voluntary blood donors of our community. The pilot study indicates a high rate of prevalence of HBV DNA among HBsAg negative/anti-HBc positive donors and thus emphasizes the need for a more sensitive and stringent screening algorithm for blood donations.

关键词： Hepatitis B virus Human immunodeficiency virus Hepatitis C virus Blood donation Occult HBV infection

Solving Intuitionistic Fuzzy Linear Programming Problem—II

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International Journal of Intelligence Science 2019年第4期9卷 93-110页

作者： Arpita Kabiraj prasun Kumar Nayak Swapan Raha Department of Mathematics Siksha-Bhavana (Institute of Sciences) Visva-Bharati University Santiniketan India Department of Mathematics Midnapore College (Autonomous) Midnapore India.

Under non-random uncertainty, a new idea of finding a possibly optimal solution for linear programming problem is examined in this paper. It is an application of the intuitionistic fuzzy set concept within scope of the existing fuzzy optimization. Here, we solve a linear programming problem (LPP) in an intuitionistic fuzzy environment and compare the result with the solution obtained from other existing techniques. In the process, the result of associated fuzzy LPP is also considered for a better understanding.

关键词： Fuzzy Linear Programming Problem (FLPP) Intuitionistic Fuzzy Set (IFS) Intuitionistic Fuzzy Number (IFN) Intuitionistic Fuzzy Linear Programming Problem (IFLPP)