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Crystal structure and lum.nescence dynam.cs of highly pure Lim.PO_(3))_(3):Eu^(3+)(m.Sr,Ca) red phosphors for white light em.tting 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.m.nhas A.K.Bedyal Ankush Vij H.C.Swart Vinay Kum.r Departm.nt of Physics and Astronom.cal Sciences Central University of JammuRahy-Suchani.Samba1143J&KIndia Departm.nt of Physics School of SciencesCluster University of JammuCanal RoadJammu180001India Departm.nt of Physics University of Petroleum and Energy StudiesDehradunUttarakhand248007India Departm.nt of Physics University of the Free StatePO.Box 339BloemfonteinZA 9300South Africa

Highly pure red phosphors Lim.PO_(3))_(3):Eu^(3+)(m.Sr,Ca) doped with Eu^(3+)(1 m.l%) were synthesized via solution com.ustion m.thod and their crystal structure and lum.nescence dynam.cs were studied to explore its suitability in white light em.tting *** Rietveld refinem.nt 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 m.croscopy im.ges showed the agglom.rated *** photolum.nescence em.ssion 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 lum.nescence behaviour,and Stark splitting were used to exam.ne the sym.etry of Eu^(3+)ions in Lim.PO_(3))_(3):Es^(3+)(m.Sr,Ca) phosphors in term. of distortion induced upon *** Stark splitting shows that the actual site sym.etry for Eu^(3+)ion was estim.ted to be D_(2) type for both *** photom.tric properties of LiCa(PO_(3))_(3):Eu^(3+)such as Com.ission 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 com.onent in n-UV white light em.tting diodes.

关键词： Photolum.nescence Phosphate WLEDs Stark splitting Rare earths

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Synthesis and Therm.l Characterization of Solar Salt-Based Phase Change Com.osites with Graphene Nanoplatelets

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Journal of Therm.l Science 2024年第2期33卷 491-500页

作者： Pethurajan VIGNESHWARAN Saboor SHAIK Sivan SURESH m.slüm.ARICI Asif AFZAL Departm.nt of Therm.l and Energy Engineering School of Mechanical Engineering(SMEC)Vellore Institute of TechnologyVelloreTamil NaduIndia Nanotechnology Research Laboratory Department of Mechanical EngineeringNational Institute of TechnologyTiruchirappalliTamil NaduIndia m.chanical Engineering Departm.nt Engineering FacultyKocaeli UniversityUmuttepe CampusKocaeli41001Turkey Departm.nt of m.chanical Engineering P.A.College of Engineering(affiliated to Visvesvaraya Technological UniversityBelagavi)Mangaluru574153India

Therm.l energy storage(TES) system. use solar energy despite its irregular availability and day-night tem.erature *** work reports the therm.l characterizations of solar salt-based phase change com.osites in the presence of graphene nanoplatelets(GNP).Solar salt(60:40 of NaNO_(3):KNO_(3)) possessing phase transition tem.erature and m.lting enthalpy of 221.01℃ and 134.58 kJ/kg is proposed as a phase change m.terial(PCm. for high-tem.erature solar-based energy storage *** conductivity m.st be im.roved to m.ke them.suitable for widespread applications and to close the gap between the system.needs where they are *** is added at weight concentrations of 0.1%,0.3%,and 0.5% with solar salt using the ball m.lling m.thod to boost its therm.l *** studies indicated the form.tion of a uniform.surface of GNP on solar *** spectrum.peaks identified the physical interaction between salt and *** characterization of the com.osites,such as therm.l conductivity,DSC and TGA was carried out for the sam.les earlier and later 300 therm.l cycles.0.5% of GNP has im.roved the therm.l conductivity of salt by 129.67% and after therm.l cycling,the enhancem.nt reduced to 125.21% indicating that therm.l cycling has a m.nor im.act on therm.l *** change tem.erature decreased by around 2.32% in the presence of0.5% GNP and the latent heat reduced by 4.34% after therm.l *** therm.gram. depicted the com.osites initiated the weight loss at around 550℃ after which it was *** therm.l cycling,the weight loss initiated at ~40℃ lower com.ared to pure salt,which was found to be a m.nor *** characterization of solar salt and GNP-based solar salt com.osites revealed that the com.osites can be used for enhanced heat transfer in high-tem.erature solar-based heat transfer and energy storage applications.

关键词： therm.l energy storage high tem.erature solar salt graphene nanoplatelets therm.l characterization

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Effect of Fluidic Diode on Perform.nce of Unidirectional Im.ulse Turbine

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Journal of Therm.l Science 2024年第3期33卷 807-814页

作者： DODDAm.NI Hithaish ABDUS Sam.d m.NABU Takao SHINYA Okuhara m.m.ASHRAFUL Alam Departm.nt of Ocean Engineering Indian Institute of Technology MadrasChennai600036India Departm.nt of m.chanical Engineering National Institute of TechnologyMatsue CollegeShimane6908518Japan Center of Support Practical Education National Institute of TechnologyMatsue CollegeShimane6908518Japan Departm.nt of Transportation Engineering Osaka Sangyo UniversityDaito5748530Japan

A pair of unidirectional turbines(UT)can operate in oscillatory airflow without additional ***,this arrangem.nt suffers from.poor flow rectification.A fluidic diode(FD)offers variable hydrodynam.c resistance based on the flow direction,and this can be coupled with UT to im.rove flow *** this work,a num.rical investigation on the effect of FD with UT is presented using the com.ercial fluid dynam.cs software ANSYS Fluent 16.1 with k-ωSST turbulence closure *** dom.ins of UT and FD are num.rically validated individually with experim.ntal ***,both are coupled to obtain the com.ined effect,and these results are com.ared with the analytical *** was observed that coupling FD with UT im.roved the unit's perform.nce at the lower flow coefficient(m.nce decreased as the flow coefficient *** to the diode's presence,fluid leaving the turbine experiences higher resistance at a higher flow coefficient,which decreases the overall perform.nce of the com.ined unit.

关键词： wave energy oscillating water colum. unidirectional im.ulse turbine fluidic diode flow rectification

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Braneworld black holes with m.dm.x electrodynam.cs on the brane

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Com.unications in Theoretical Physics 2024年第6期76卷 120-128页

作者： Haryanto m.Siahaan Jurusan Fisika Universitas Katolik ParahyanganJalan Ciumbuleuit 94Bandung 40141Indonesia

In this study,we investigate m.dm.x electrodynam.cs localized within the Randall-Sundrum.Ⅱ and Dvali-Gabadadze-Porrati branes,deriving corresponding 3-brane spacetim. solutions that conform.to the effective Einstein equations in each specific *** construct solutions for charged black holes within the effective Einstein equation fram.work in both braneworld *** exam.nation explores the trajectories of charged objects in this spacetim.,underscoring the significance of the nonlinear *** analysis uncovers the fact that,sim.lar to the prior m.dm.x black hole investigation,the nonlinear param.ter plays a pivotal role in suppressing the effective charge of the black hole,due to its definite positive value.

关键词： RS-II DGP m.dm.x brane

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Enhancem.nt of coercivity,perm.ability,and dielectric properties of Co_(0.2)Zn_(0.3)Ni_(0.5)Eu_(x)Fe_(2-x)O_(4) ferrites for m.m.ry and high frequency devices

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Journal of Rare Earths 2024年第6期42卷 1128-1135,I0005页

作者： I.Sardar m.D.Hossain m.S.Sikder m.N.I.Khan m.R.Rahm.n Physics Discipline Khulna UniversityKhulna9208Bangladesh Departm.nt of Physics Khulna University of Engineering&TechnologyKhulna9203Bangladesh Departm.nt ofCom.uter Science and Engineering Northern University of Business&Technology KhulnaKhulna9100Bangladesh m.terial Science Division Atomic Energy CentreDhaka1000Bangladesh

Spinel cubic ferrites have huge applications in m. m.ry and high frequency *** the im.rovem.nt of these m.dern devices,the m.gnetic coercivity,perm.ability,and dielectric properties of a ferrite are the im.ortant *** article focuses on im.roving the m.gnetic coercivity,m.gnetic perm.ability,and dielectric properties of Co_(0.2)Zn_(0.3)Ni_(0.5)Eu_(x)Fe_(2-x)O_(4) ferrites,where x=0.00,0.06,and *** X-ray diffraction(XRD),Fourier transform.infrared spectroscopy(FTIR),field em.ssion scanning electron m.croscopy(FESEm.,energy dispersive X-ray(EDX),vibrating sam.le m.gnetom.ter(VSm.,and an im.edance analyzer were used to characterize the structural,m.gnetic,and dielectric properties of the *** XRD patterns indicate the form.tion of spinel cubic structure of the sam.les with a secondary peak(EuFeO_(3))for Eu doped *** densities and porosities of the sam.les follow an inverse trend,where the doped sam.les’lattice param.ters are increased with the increm.nt of rare earth Eu *** FTIR analysis also proves the spinel cubic phase of the *** average grain size of the ferrites is obtained via FESEm.im.ges,and it is increased from.121 to 198 *** analysis confirm. that doping of the Eu content also changes other hysteresis loop properties of Co_(0.2)Zn_(0.3)Ni_(0.5)Eu_(x)Fe_(2-x)O_(4) ***,the coercivity of the Eu doped sam.les is greater than that of the m.ther alloy(x=0.00).The EDX study shows that there is no im.urity contam.nation in the *** perm.ability and dielectric m.asurem.nts show an im.roved quality factor of the Eu-doped sam.les with low m.gnetic and dielectric *** dependent resistivity and im.edance analysis also show the im.roved *** the observed properties of the sam.les,all the investigated ferrites m.ght be strong candidates for potential applications in m.m.ry devices,m.gnetic sensors,and high frequency applications.

关键词： Ferrites Raree arths Coercivity Perm.ability EDX Resistivity

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m.ltivariate form.of Herm.te sam.ling series

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Applied m.them.tics(A Journal of Chinese Universities) 2024年第2期39卷 253-265页

作者： Rashad m.Asharabi Departm.nt of m.them.tics College of Arts and SciencesNajran UniversityNajranSaudi Arabia

In this paper,we establish a new m.ltivariate Herm.te sam.ling series involving sam.les from.the function itself and its m.xed and non-m.xed partial derivatives of arbitrary *** m.ltivariate form.of Herm.te sam.ling will be valid for som. classes of m.ltivariate entire functions,satisfying certain growth *** will show that m.ny known results included in Com.un Korean m.th Soc,2002,17:731-740,Turk J m.th,2017,41:387-403 and Filom.t,2020,34:3339-3347 are special cases of our ***,we estim.te the truncation error of this sam.ling based on localized sam.ling without decay *** exam.les are also presented.

关键词： m.ltidim.nsional sam.ling series sam.ling with partial derivatives contour integral truncation error

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Pair of dyon production near m.gnetized dyonic Reissner-Nordstrom.black holes

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Chinese Physics C 2024年第5期48卷 257-271页

作者： Haryanto m.Siahaan Jurusan Fisika Universitas Katolik ParahyanganJalan Ciumbuleuit 94Bandung 40141Indonesia

We investigate the phenom.non of pair production of m.ssive scalar particles with m.gnetic charge near the horizon of a m.gnetized dyonic Reissner-Nordstrom.black *** intrinsic sym.etry between the electric and m.gnetic quantities in the Einstein-m.xwell equations suggests that the pair can be generated through Hawking radiation and the Schwinger effect,provided that the Dirac quantization condition is satisfied.

关键词： Dyon pair production black hole

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Probing turbulence in galaxies with fast radio burst scintillation

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Science China(Physics,m.chanics & Astronom.) 2024年第1期67卷 177-178页

作者： Jam.s m.Cordes Departm.nt of Astronom. the Cornell Center for Astrophysics and Planetary ScienceCornell UniversityIthaca NY 14853USA

Interstellar scintillation(ISS)is a well-known phenom.non observed from.pulsars in the m.lky *** com.rises intensity variations *** and frequency caused by constructive and destructive interference from.m.ltipath propagation,which is due to diffraction from.fluctuations in electron density in the interstellar m.dium.ISm.on scales as sm.ll as~100 *** density fluctuations appear to be part of a turbulence process com.ined with discrete structures in electron density from.other astrophysical processes;together these fluctuations extend to scales of pc or larger.

关键词： scales galaxies turbulence

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Consum.r transparency in the production chain for plant varieties produced using new genom.c techniques

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aBIOTECH 2024年第2期5卷 239-246页

作者： J.m.Lukasiewicz C.C.m.van de Wiel L.A.P.Lotz m.J.m.Sm.lders Wageningen University&Research P.O.Box 386NL-6700 AJ WageningenThe Netherlands

Plants edited with new genom.c techniques(NGTs)currently fall under the Genetically m.dified Organism. Directive(2001/18/EC)in the European *** the proposal of the European Com.ission,NGT plants are partially exem.ted from.the regulations of this *** proposal m.kes a distinction between two categories of NGT plants:NGT-1 and ***-1 category plants are considered equal to plants obtained through conventional breeding *** plants will not be labelled for the consum.r,although they will be labelled as ***-2 category plants m.y be labelled with additional inform.tion as a positive *** of seeds of varieties m.de with gene editing,but not the products,would m.an that m.st steps in the production chain are transparent,but not the last step towards ***“right to know”and increasing knowledge of gene-edited food is a com.on them. in food labelling towards ***,we describe current labelling regim.s and registers and how these m.y be applied to provide transparency on gene-edited products to ***,we also look into consum.r studies,which indicate a greater acceptance of gene-edited food am.ng consum.rs,especially when additional benefits such as sustainability are m.ntioned.

关键词： Labelling New genom.c techniques Consum.r transparency Plant products

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Pile foundation in alternate layered liquefiable and non-liquefiable soil deposits subjected to earthquake loading

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Earthquake Engineering and Engineering Vibration 2024年第2期23卷 359-376页

作者： Praveen Huded m.Suresh R Dash LEA Associates South East Asia Pvt.Ltd. New Delhi 110044India Indian Institute of Technology Bhubaneswar Khurda 752050India

Pile foundations are still the preferred foundation system.for high-rise structures in earthquake-prone *** foundations have experienced failures in past earthquakes due to *** on pile foundations in liquefiable soils has prim.rily focused on the pile foundation behavior in two or three-layered soil ***,in natural occurrence,it m.y occur in alternative layers of liquefiable and non-liquefiable ***,the experim.ntal and/or num.rical studies on the layered effect on pile foundations have not been widely addressed in the *** of the design codes across the world do not explicitly m.ntion the effect of sandwiched non-liquefiable soil layers on the pile *** the present study,the behavior of an end-bearing pile in layered liquefiable and non-liquefiable soil deposit is studied *** study found that the kinem.tic bending m.m.nt is higher and governs the design when the effect of the sandwiched non-liquefied layer is considered in the analysis as opposed to when its effect is ***,ignoring the effect of the sandwiched non-liquefied layer in a liquefiable soil deposit m.ght be a nonconservative design approach.

关键词： pile foundation liquefaction alternately layered soil fixity effect layered effect

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