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Crystal structure and luminescence dynamics of highly pure LiM(PO_(3))_(3):Eu^(3+)(M=Sr,Ca) red phosphors for white light emitting diodes

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Journal of Rare Earths 2024年第8期42卷 1470-1478,I0002页

作者： Payal Khajuria M.Manhas A.K.Bedyal ankush.vij H.C.Swart Vinay Kumar Department of Physics and Astronomical Sciences Central University of JammuRahy-Suchani.Samba1143J&KIndia Department of Physics School of SciencesCluster University of JammuCanal RoadJammu180001India Department of Physics University of Petroleum and Energy StudiesDehradunUttarakhand248007India Department of Physics University of the Free StateP.O.Box 339BloemfonteinZA 9300South Africa

Highly pure red phosphors LiM(PO_(3))_(3):Eu^(3+)(M=Sr,Ca) doped with Eu^(3+)(1 mol%) were synthesized via solution combustion method and their crystal structure and luminescence dynamics were studied to explore its suitability in white light emitting *** Rietveld refinement analysis of the powder Xray diffraction patterns reveals that the phosphors belong to the pure triclinic phase of LiSr(PO_(3))_(3) and LiCa(PO_(3)) with space group P-1(2).The scanning electron microscopy images showed the agglomerated *** photoluminescence emission spectra under 393 nm show an orange band at 594 nm and a red band at 613 nm ascribed to ^(5)D_(0)→^(7)F_(1).^(5)D_(0)→^(7)F_(2) transitions of Eu^(3+)ion in both the ***,the spectroscopic properties such as luminescence behaviour,and Stark splitting were used to examine the symmetry of Eu^(3+)ions in LiM(PO_(3))_(3):Es^(3+)(M=Sr,Ca) phosphors in terms of distortion induced upon *** Stark splitting shows that the actual site symmetry for Eu^(3+)ion was estimated to be D_(2) type for both *** photometric properties of LiCa(PO_(3))_(3):Eu^(3+)such as Commission International de l'Eclairage coordinates(x=0.64,y=0.36) near to the standard one(red),high color purity(95%) and higher brightness reveal that the phosphor has the capability of acting as a red component in n-UV white light emitting diodes.

关键词： Photoluminescence Phosphate WLEDs Stark splitting Rare earths

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Combined hepatocellular cholangiocarcinoma: A clinicopathological update

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World Journal of Hepatology 2024年第5期16卷 766-775页

作者： Mukul vij Fadl H Veerankutty Ashwin Rammohan Mohamed Rela Department of Pathology Institute of Liver Disease and TransplantationChennai 600044India Comprehensive Liver Care Institute VPS LakeshoreCochin 682040India Institute of Liver Disease and Transplantation Dr.Rela Institute and Medical CentreChennai 600044India

Combined hepatocellular-cholangiocarcinoma(cHCC-CCA)is a rare primary liver cancer associated with an appalling *** diagnosis and manage-ment of this entity have been challenging to physicians,radiologists,surgeons,pathologists,and oncologists *** diagnostic and prognostic value of biomarkers such as the immunohistochemical expression of nestin,a progenitor cell marker,have been explored *** a better understanding of biology and the clinical course of cHCC-CCA,newer treatment modalities like immune checkpoint inhibitors are being tried to improve the survival of patients with this rare *** this review,we give an account of the recent developments in the pathology,diagnostic approach,and management of cHCC-CCA.

关键词： Combined hepatocellular-cholangiocarcinoma Immunotherapy Nestin Hepatocellular carcinoma Cholangiocarcinoma Liver cancer Biomarker Immune checkpoint inhibitors Pathology Genomic landscape

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Chemically inducing room temperature spin-crossover in double layered magnetic refrigerants Pr1.4+xSr1.6-xMn2O7(0.0≤x≤0.5)

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Journal of Materials Science & Technology 2022年第29期124卷 232-242页

作者： Akshay Kumar Kavita Kumari Mohit K.Sharma ankush.vij Shalendra Kumar Seok-Hwan Huh Bon Heun Koo Department of Materials Convergence and System Engineering Changwon National UniversityChangwonGyeongnam51140South Korea School of Material Science and Engineering Changwon National UniversityChangwonGyeongnam51140South Korea Department of Physics University of Petroleum&Energy StudiesDehradun248007India Department of Physics College of ScienceKing Faisal UniversityHofufAl-Ahsa31982Saudi Arabia

The height of total entropy(S)for a magnetic refrigerant material is essentially concerned with the magnetic and structural ***,the participation of such transitions in layered materials is not well ***,the purpose of this work is to investigate the interplay between double layer lattice with their single perovskite counterpart,to achieve optimal magnetocaloric performance.A series of self-doped Pr_(1.4+x)Sr_(1.6-x)Mn_(2)O_(7)(0.0≤x≤0.5)Ruddlesden-Popper(R-P)perovskite have been prepared through the solid-state sintering *** increasing the Pr-stoichiometry,the lattice faults have increased and the double layer lattice dramatically disintegrates into single perovskite *** to the reduction of bilayer R-P phase into single perovskite the spin crossover occurs from weak bilayer(T=304 K)interactions towards the strong three-dimensional(T=308 K)interactions *** series consistently develops thermomagnetic irreversibility in zero-field cooled(ZFC)-field cooled(FC)magnetization,which is indicative of a spin-glass *** glassy nature has been ascribed collectively to the lattice strain produced because of dislocations and to an antiferromagnetic phase segregated at the *** maximum value of temperature average entropy change(TEC)and adiabatic temperature(ΔT)has enhanced nearly by 4 folds from 0.53 J kg^(-1)K^(-1),0.59 K(for x=0.0)up to 1.85 J kg^(-1)K^(-1),10 K(for x=0.5)at 2.5 T,***,the room temperature relative cooling power has improved from 26.94 J/kg up to 77.84 J/kg with an applied field of 2.5 *** findings in this work suggest that the controlled reduction of double layer lattice into single perovskite and/or existence of both phases simultaneously in bilayer R-P manganites may be very effective in obtaining the desirable characteristics of magnetocaloric effects.

关键词： Magnetic refrigerant Bilayer manganites Magnetocaloric effect Ruddlesden-popper perovskite Relative cooling power

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Effect of temperature on carrier transport and photoconductivity of Mn-doped FeS2 thin films

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Progress in Natural Science:Materials International 2022年第1期32卷 135-142页

作者： Jugraj Singh Kulwinder Singh Manjot Kaur Anup Thakur Ram K.Sharma ankush.vij Akshay Kumar Department of Nanotechnology Sri Guru Granth Sahib World University Department of Basic and Applied Sciences Punjabi University Centre for Interdisciplinary Research University of Petroleum and Energy Studies (UPES) Department of Physics University of Petroleum and Energy Studies (UPES)

Thin-film of Mn-doped iron disulfide（FeS2） has been prepared using the thermal evaporation method. This work reports the Hall measurements, temperature and light intensity-dependent photoconductivity, electrical transport mechanism, and photodetection properties of Mn-doped FeS2thin film. The transient photoconductivity measurements of p-type Mn-doped FeS2thin film show a consistent dependence upon temperature and light *** transport mechanism was illustrated using different models. In region-Ⅰ（303–393 K） deposited film followed the thermally activated transport mechanism. Nearest neighbour hopping（NNH） transport mechanism was followed by region-Ⅱ（274–293 K）, and Mott's variable range hopping（VRH） mechanism was dominant in region Ⅲ（108–273 K）. The fabricated device resulted in higher photoconductivity due to collecting charge carriers through electrodes under light illumination. The results also revealed that Mn-doped thin film possessed good photoresponsivity（～19 m A/W） as well as photo-detectivity(～3.4 × 1012Jones) due to the occupation of localized states formed by Mn-doping. Light intensity-dependent photodetection properties suggested the potential for real-time photodetection applications.

关键词： Mn-doped FeS 2 Charge transport Hopping mechanism Photodetection Responsivity

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Transportation mode detection using cumulative acoustic sensing and analysis

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Frontiers of Computer Science 2021年第1期15卷 237-239页

作者： Dinesh vij Naveen AGGARWAL University Institute of Engineering and Technology Panjab UniversityChandigarh 160014India

1 Introduction Smartphone sensing has emerged as an active area of interest for researchers,as these are increasingly being used in smart transportation *** paper focuses on a smartphone based vehicle monitoring system,*** mode *** of the transportation mode of a commuter is usually carried out through a combination of motion sensors such as an accelerometer and position sensors such as GPS[1].

关键词： mode smart transportation

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Quadruple Gaussian Laser Beam Profile Dynamics in Collisionless Magnetized Plasma

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Communications in Theoretical Physics 2018年第9期69卷 317-324页

作者： Shivani vij Munish Aggarwal Department of Applied Sciences DAV Institute of Engineering&TechnologyJalandhar 144008India Department of Applied Sciences Lyallpur Khalsa College of EngineeringJalandhar 144001India

This paper presents an investigation of self-focusing of a quadruple Gaussian laser beam in collisionless magnetized *** nonlinearity due to ponderomotive force which arises on account of nonuniform intensity distribution of the laser beam is *** nonlinear partial differential equation governing the evaluation of complex envelope in the slowly varying envelope approximation is solved using a paraxial *** self-focusing mechanism in magnetized plasma,in the presence of self-compression mechanism will be analyzed in contrast to the case in which it is *** can be observed that,in case of ponderomotive nonlinearity,the self-compression mechanism obstructs the pulse self-focusing above a certain intensity *** effect of an external magnetic field is to generate pulses with smaller spot size and shorter compression *** lateral separation parameter and the initial intensity of the laser beam play a crucial role on focusing and compression ***,the three-dimensional analysis of pulse propagation is presented by coupling the self-focusing equation with the self-compression one.

关键词： self-focusing quadruple Gaussian beam magnetoplasma spatiotemporal ponderomotive force

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Self-Focusing of Quadruple Gaussian Laser Beam in an Inhomogenous Magnetized Plasma with Ponderomotive Non-Linearity:Effect of Linear Absorption

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Communications in Theoretical Physics 2015年第11期64卷 565-570页

作者： Munish Aggarwal Shivani vij Niti Kant Department of Physics Lyallpur Khalsa College of Engineering Department of Applied Sciences DAV Institute of Engineering & Technology Department of Physics Lovely Professional University

The propagation of quadruple Gaussian laser beam in a plasma characterized by axial inhomogeneity and nonlinearity due to ponderomotive force in the paraxial ray approximation is *** appropriate expression for the nonlinear dielectric constant has been developed in the presence of external magnetic field,with linear absorption and due to saturation effects for arbitrary large *** effects of different types of plasma axial inhomogeneities on self-focusing of laser beam have been studied with the typical laser and plasma ***-focusing of quadruple Gaussian laser beam in the presence of externally applied magnetic field and saturating parameter is found significantly improved in the case of extraordinary *** results reveal that initially converging beam shows oscillatory convergence whereas initially diverging beam shows oscillatory *** beam is more focussed at lower intensity in both cases *** and ordinary mode.

关键词： self-focusing quadruple inhomogeneous magnetized p

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An overview of chemical enhanced oil recovery and its status in India

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Petroleum Science 2023年第4期20卷 2305-2323页

作者： Ganesh Kumar Pothula Rakesh Kumar vij Achinta Bera Department of Petroleum Engineering School of Energy TechnologyPandit Deendayal Energy UniversityGandhinagarGujarat382007India

India is currently producing crude oil from matured fields because of insufficient discoveries of new ***,in order to control the energy crisis in India,enhanced oil recovery(EOR)techniques are required to reduce the import of crude from the OPEC(Organization of the Petroleum Exporting Countries).This review mentions chemical EOR techniques(polymers,surfactants,alkali,nanoparticles,and combined alkali-surfactant-polymer flooding)and operations in *** EOR methods are one of the most efficient methods for oil *** efficiency is enhanced by interfacial tension(IFT)reduction using surfactants and alkali,and mobility control of injected water is done by adding a polymer to increase the volumetric sweep *** paper also reviews the current trend of chemical EOR,prospects of chemical EOR in Indian oilfields,the development of chemical EOR in India with their challenges raising with economics,and screening criteria for chemical EOR implementation on the field ***,the review gives a brief idea about chemical EOR implementation in Indian oilfields in future prospects to increase the additional oil recovery from existing depleted fields to reduce the import of crude *** outcome of this review depicts all chemical EOR operations and recovery rates both at the laboratory scale and field scale around the *** additional recovery rates are compared from various chemical EOR methods like conventional chemical flooding methods and conventional chemicals combined with nanoparticles on a laboratory *** development of chemical EOR in the past few decades and the EOR policy given by the government of India has been mentioned in this *** analysis provides an idea about enhanced recovery screening and implementation of chemical EOR methods in existing fields will significantly reduce the energy crisis in India.

关键词： Chemical enhanced oil recovery Surfactant flooding Polymer flooding Indian oilfields Enhanced oil recovery challenges in India Screening criteria

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Lead Induced Disorders in Hematopoietic and DrugMetabolizing Enzyme System and Their Protection by Ascorbic Acid Supplementation

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Biomedical and Environmental Sciences 1998年第1期11卷 7-14页

作者： AnjanaG.vij N.K.SATIJA 等 DefenceInstituteofPhysiologyandAlliedSciences LucknowRoadTimarpurDelhi－110054India DefenceInstitut

Effect of vitamin C supplementation in restoring lead induced alterations in hematopoietic system and drug metabolizing enzymes were investigated in male rats. Intraperitoneal administration of 20 mg/kg lead produced a significant inhibition of heme synthesis in blood and liver and drug metabolism in liver. Toxic insult by lead also resulted into a marked decline in tissue thiols and vitamin C levels. Oral supplementation of vitamin C (100 mg/kg for 3 days) completely restored blood delta aminolevulinic acid dehydratase, uroporphyrinogen I synthetase and a few drug metabolizing enzymes. Level of vitamin C and sulfhydryl contents too recovered to a great extent. A marked reduction in blood and liver lead concentration occurred on vitamin C supplementation although renal lead contents were marginally reduced in lead exposed animals. The results, thus, indicate a significant protective action of vitamin C against toxic effects of lead on heme synthesis and drug metabolism.

关键词： acid Lead Induced Disorders in Hematopoietic and DrugMetabolizing Enzyme System and Their Protection by Ascorbic Acid Supplementation

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Study of Sputtered Fe/t<sub>Si</sub>/Fe Trilayer Films: Magnetic and Electronic Properties

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Journal of Modern Physics 2011年第8期2卷 864-874页

作者： Ranjeet Brajpuriya Ram K. Sharma ankush.vij T. Shripathi 不详

A series of trilayers of sputtered Fe/Si/Fe were grown to study the interface characteristics and magnetic coupling between ferromagnetic Fe layers (30 ? thick) for Si spacer thickness (tSi) ranging from 15 ? to 40 ?. Grazing incidence x-ray diffraction, AFM, resistivity and x-ray photoelectron spectroscopy (XPS) meas-urements show substantial intermixing between the layers during deposition which results in trilayers of complicated structures for different sub-layer thicknesses. A systematic variation in silicide concentration across the interface is observed by XPS measurements. The Fe layers in the trilayers were observed to con-sist of Fe layers doped with Si, ferromagnetic Fe-Si silicide layers and nonmagnetic Fe-Si silicide interface layer, while the Si spacer was found to be Fe-Si compound layers with an additional amorphous Si (α-Si) sublayer for tSi≥ 30 ?. A strong anti-ferromagnetic (AF) coupling was observed in trilayers with iron silicide spacers, which disappeared if α-Si layers present in the spacers. The observed magnetization behaviour in each case is interpreted in terms of changes in interfacial structural and electronic properties due to variation in film thickness.

关键词： Magnetic Multilayer Silicide Formation Interlayer Coupling MOKE XPS

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