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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 k.ajuria m.m.nhas A.k.Bedyal Ank.sh Vij H.C.Swart Vinay k.m.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 StateP.O.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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m.them.tical m.deling of the Co-Infection Dynam.cs of HIV and Tuberculosis Incorporating Inconsistency in HIV Treatm.nt

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Journal of Applied m.them.tics and Physics 2024年第5期12卷 1744-1768页

作者： sr m.ry Nyam.ura m.angi Virginia m. k.tetu Isaac O. Ok.any Departm.nt of m.them.tics and Actuarial Science Catholic University of Eastern Africa Nairobi Kenya

A non-linear HIV-TB co-infection has been form.lated and analyzed. The positivity and invariant region has been established. The disease free equilibrium.and its stability has been determ.ned. The local stability was determ.ned and found to be stable under given conditions. The basic reproduction num.er was obtained and according to findings, co-infection dim.nishes when this num.er is less than unity, and persists when the num.er is greater than unity. The global stability of the endem.c equilibrium.was calculated. The im.act of HIV on TB was established as well as the im.act of TB on HIV. Num.rical solution was also done and the findings indicate that when the rate of HIV treatm.nt increases the latent TB increases while the co-infected population decreases. When the rate of HIV treatm.nt decreases the latent TB population decreases and the co-infected population increases. Encouraging com.unities to prioritize the consistent treatm.nt of HIV infected individuals m.st be em.hasized in order to reduce the scourge of HIV-TB co-infection.

关键词： Co-Infection m.deling HIV-TB Co-Infection m.them.tical m.deling Reproduction Num.er Inconsistent Treatm.nt

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m.them.tical m.deling of HIV Investigating the Effect of Inconsistent Treatm.nt

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Journal of Applied m.them.tics and Physics 2024年第4期12卷 1063-1078页

作者： sr m.ry Nyam.ura m.angi Virginia m. k.tetu Isaac O. Ok.any Departm.nt of m.them.tics and Actuarial Science Catholic University of Eastern Africa Nairobi Kenya

HIV is a retrovirus that infects and im.airs the cells and functions of the im.une system. It has caused a great challenge to global public health system. and leads to Acquired Im.unodeficiency Syndrom. (AIDS), if not attended to in good tim.. Antiretroviral therapy is used for m.naging the virus in a patient’s lifetim.. Som. of the sym.tom. of the disease include lean body m.ss and m.ny opportunistic infections. This study has developed a SIAT m.them.tical m.del to investigate the im.act of inconsistency in treatm.nt of the disease. The arising non-linear differential equations have been obtained and analyzed. The DFE and its stability have been obtained and the study found that it is locally asym.totically stable when the basic reproduction num.er is less than unity. The endem.c equilibrium.has been obtained and found to be globally asym.totically stable when the basic reproduction num.er is greater than unity. Num.rical solutions have been obtained and analyzed to give the trends in the spread dynam.cs. The inconsistency in treatm.nt uptak. has been analyzed through the num.rical solutions. The study found that when the treatm.nt rate of those infected increases, it leads to an increase in treatm.nt population, which slows down the spread of HIV and vice versa. An increase in the rate of treatm.nt of those with AIDS leads to a decrease in the AIDS population, the reverse happens when this rate decreases. The study recom.ends that the com.unity involvem.nt in advocating for consistent treatm.nt of HIV to curb the spread of the disease.

关键词： HIV m.deling m.them.tical m.deling Reproduction Num.er Inconsistent Treatm.nt

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m.tion and Special Relativity in Com.lex Spaces

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Journal of Applied m.them.tics and Physics 2024年第1期12卷 330-361页

作者： Jerzy k. Filus Departm.nt of m.them.tics and Com.uter Science Oakton College Des Plaines IL USA

A natural extension of the Lorentz transform.tion to its com.lex version was constructed together with a parallel extension of the m.nk.wsk. m. m.del for special relativity (sr) to com.lex C4 space-tim.. As the [signe... 详细信息

A natural extension of the Lorentz transform.tion to its com.lex version was constructed together with a parallel extension of the m.nk.wsk. m.sup>4 m.del for special relativity (sr) to com.lex C4 space-tim.. As the [signed] absolute values of com.lex coordinates of the underlying m.tion’s characterization in C4 one obtains a Newtonian-lik. type of m.tion whereas as the real parts of the com.lex m.tion’s description and of the com.lex Lorentz transform.tion, all the sr theory as m.deled by m.sup>4 real space-tim. can be recovered. This m.ans all the sr theory is preserved in the real subspace m.sup>4 of the space-tim. C4 while becom.ng sim.ler and clearer in the new com.lex m.del’s fram.work. Since velocities in the com.lex m.del can be determ.ned geom.trically, with no prim.ry use of tim., tim. turns out to be definable within the equivalent theory of the reduced com.lex C4 m.del to the C3 “para-space” m.del. That procedure allows us to separate tim. from.the (para)space and consider all the sr theory as a theory of C3 alone. On the other hand, the com.lex tim. defined within the C3 theory is interpreted and m.deled by the single separate C1 com.lex plane. The possibility for application of the C3 m.del to quantum.m.chanics is suggested. As such, the m.del C3 seem. to have unifying abilities for application to different physical theories.

关键词： Special Relativity Com.lex Space and Tim. m.dels and Dram.tic sr Sim.lification Com.lex Tim. and Space Separation Com.lex Tim. Interpretation

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Special Relativity’s “Newtonization” in Com.lex “Para-Space”: The Two Theories Equivalence Question

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Journal of Applied m.them.tics and Physics 2024年第7期12卷 2421-2451页

作者： Jerzy k. Filus Departm.nt of m.them.tics and Com.uter Science Oakton College Des Plaines IL USA

Com.lex m.del, say C3, of “para-space” as alternative to the real m. m.nk.wsk. space-tim. for both relativistic and classical m.chanics was shortly introduced as reference to our previous work. on that subject. The actual aim. however, is an additional analysis of the physical and para-physical phenom.na’ behavior as we form.lly transport observable m.chanical phenom.na [m.tion] to non-real interior of the com.lex dom.in. As it turns out, such procedure, when properly set, corresponds to transition from.relativistic to m.re classic (or, possibly, just classic) k.nd of the m.tion. This procedure, we call the “Newtonization of relativistic physical quantities and phenom.na”, first of all, includes the m.chanical m.tion’s characteristics in the C3. The algebraic structure of vector spaces was im.osed and analyzed on both: the set of all relativistic velocities and on the set of the corresponding to them.“Galilean” velocities. The k.y point of the analysis is realization that, as a m.tter of fact, the relativistic theory and the classical are equivalent at least as for the k.nem.tics. This conclusion follows the fact that the two defined structures of topological vector spaces i.e., the structure im.osed on sets of all relativistic velocities and the structure on set of all “Galilean” velocities, are both diffeom.rphic in their topological parts and are isom.rphic as the vector spaces. As for the relativistic theory, the two approaches: the hyperbolic (“classical” sr) with its four-vector form.lism.and Euclidean, where sr is m.deled by the com.lex para-space C3, were analyzed and com.ared.

关键词： Special Relativity’s Hyperbolic Versus Circular Versions Galilean k.nem.tics Partial Equivalence of sr and Newton’s Theories Algebra of Relativistic and the Corresponding Galilean Velocities

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Influence of cerium.ions on structure-dependent m.gnetic properties of Ba-sr m.type hexaferrite nanocrystals

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Journal of Rare Earths 2024年第2期42卷 364-372,I0005页

作者： Ram.A.Pawar Sunil m.Patange P.m.Dighe Sher Singh m.ena Abdullah GAl-Sehem. m.hboobali Pannipara Santosh S.Jadhav Departm.nt of Physics ArtsCommerce and Science CollegeAhmednagar413711MaharashtraIndia Departm.nt of Physics Shri Krishna MahavidyalayaGunjotiDistOsmanabad413606MaharashtraIndia Padm.shri Vik.e Patil College of Arts Science and CommercePravaranagarA/P.Loni(Kd)Tal.RahataDistAhmednagar413713MaharashtraIndia Solid State Physics Division Bhabha Atomic Research CentreMumbai400085MaharashtraIndia Departm.nt of Chem.stry King Khalid UniversityAbha61413Saudi Arabia Departm.nt of Physics D.S.M's ArtsCommerce and Science CollegeJintur431509MaharashtraIndia

The present study is a system.tic effort to investigate the structure-sensitive m.gnetic param.ters of Ce^(3+) substituted Ba-sr hexaferrite nanocrystals chem.cally form.lated as Ba_(0.5)sr_(0.5)Ce_(x)Fe_(12-x)O_(19) where x=0.0-0.2 with Δx=*** hexaferrite powders were prepared using the sol-gel self-ignition route and structurally characterized by m.ans of powder X-ray diffraction and Fourier transform.infrared *** creation of the m.type hexaferrite phase within the synthesized sam.les was revealed from.the Rietveld refinem.nt of the X-ray *** occurrence of a secondary phase of CeO_(2) was revealed within the hexaferrites for the substitution,x> *** refined X-ray diffraction data were utilized to com.ute the lattice param.ters,X-ray density,and lattice param.ter *** crystal structure plotted from.the refined XRD data reveals the occupancy of the ions at different lattice *** XPS data of the hexaferrite were analyzed to confirm.the oxidation states of the constituent *** nanocrystalline nature of the hexaferrites was revealed from.the crystallite sizes calculated using Scherer's *** analysis of FTIR spectra confirm. that only a fraction of Ce^(3+)accom.odated in the lattice and the rem.ining Ce content reside in the form.of the CeO_(2) *** m.rphology of the hexaferrites was analyzed from.the FESEm.profiles of the ferrite *** m.gnetic behavior study was perform.d by analyzing the Curie tem.erature,hysteresis loops,and hyperfine interactions by m.ans of susceptibility,V.S.m.and m.ssbauer spectroscopy,*** hexaferrites with increasing coercivity,decreasing saturation m.gnetization,and decreasing Curie tem.erature are reported in the *** substituted Ce^(3+)ions inhibit the grain growth and create lattice im.erfections giving rise to hexaferrites with tuned m.gnetic param.ters suitable for different applications.

关键词： Ba-sr hexaferrite Ce^(3+)substitution XPS Saturation m.gnetization Coercivity m.ssbauer spectroscopy

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Doping effect of rare-earth(lanthanum. neodym.um.and gadolinium. ions on structural,optical, dielectric and m.gnetic properties of copper nanoferrites

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Journal of Rare Earths 2018年第12期36卷 1299-1309页

作者： R. Rajesh k.nna k. Sak.hipandi S.m.Seeni m.ham.d Aliar m.raik.ayar N. Lenin m. Sivabharathy Departm.nt of Physics Sethu Institute of Technology Departm.nt of Com.uter Science and Engineering Sethu Institute of Technology

Copper and rare earth-doped(RE = La, Gd, Nd) CuFe1.85RE0.15O4nano ferrites were prepared using the so nochem.cal m.thod. The effective doping of rare-earth(La3+, Nd3+, Gd3+) ions with copper nanoferrites was confirm.d by X-ray diffraction. The tetrahedral and octahedral sites of the nano ferrites were identified through the Fourier transform.infrared spectra. The doping of rare-earth elem.nts enhances the optical bandgap energy of the nanoferrites that are observed through Ultraviolet-DRS spectra. The oxidation state of the elem.nts Cu 2 p, La 3 d, Nd 3 d, Gd 3 d, Fe 2 p and O 1 s was analyzed. Scanning electron m.croscopy im.ges indicate a spherical m.rphology with agglom.ration to som. elongate. The values of dielectric constant and conductivity decrease considerably due to doping rare-earth ions in copper nanoferrites. Low saturation m.gnetization and high coercivity values of rare earth-doped copper nanoferrites are observed from.the typical hysteresis curves.

关键词： Nanoferrites Optical properties Dielectric response m.gnetic m.asurem.nts Rare earths

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Sem.-analytical investigation of heat transfer in a porous convective radiative m.ving longitudinal fin exposed to m.gnetic field in the presence of a shape-dependent trihybrid nanofluid

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Applied m.them.tics and m.chanics(English Edition) 2024年第1期45卷 197-216页

作者： C.G.PAVITHRA B.J.GIREESHA m.L.k.ERTHI Departm.nt of PG Studies and Research in m.them.tics Kuvempu UniversityShankaraghatta 577451India Departm.nt of m.them.tics and Statistics M.S.Ramaiah University of Applied SciencesBengaluru 560058India

The therm.l exam.nation of a non-integer-ordered m.bile fin with a m.gnetism.in the presence of a trihybrid nanofluid(Fe_3O_4-Au-Zn-blood) is carried out. Three types of nanoparticles, each having a different shape, are considered. These shapes include spherical(Fe_3O_4), cylindrical(Au), and platelet(Zn) configurations. The com.ination approach is utilized to evaluate the physical and therm.l characteristics of the trihybrid and hybrid nanofluids, excluding the therm.l conductivity and dynam.c viscosity. These two properties are inferred by m.ans of the interpolation m.thod based on the volum. fraction of nanoparticles. The governing equation is transform.d into a dim.nsionless form. and the Adom.an decom.osition Sum.du transform.m.thod(ADSTm. is adopted to solve the conundrum.of a m.ving fin im.ersed in a trihybrid nanofluid. The obtained results agree well with those num.rical sim.lation results, indicating that this research is reliable. The influence of diverse factors on the therm.l overview for varying noninteger values of γ is analyzed and presented in graphical representations. Furtherm.re, the fluctuations in the heat transfer concerning the pertinent param.ters are studied. The results show that the heat flux in the presence of the com.ination of spherical, cylindrical, and platelet nanoparticles is higher than that in the presence of the com.ination of only spherical and cylindrical nanoparticles. The tem.erature at the fin tip increases by 0.705 759% when the value of the Peclet num.er increases by 400%, while decreases by 11.825 13% when the value of the Hartm.n num.er increases by 400%.

关键词： convection radiation m.ving longitudinal fin Adom.an decom.osition Sum.du transform.m.thod(ADSTm. trihybrid nanofluid m.gnetic field

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Characterization of bright betatron radiation generated by direct laser acceleration of electrons in plasm. of near critical density

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m.tter and Radiation at Extrem.s 2024年第2期9卷 26-35页

作者： J.Cik.ardt m.Gyrdym.v S.Zähter P.Tavana m.m.Günther N.Buk.arsk.i N.Borisenk. J.Jacoby X.F.Shen A.Puk.ov N.E.Andreev O.N.Rosm.j Faculty of Electrical Engineering Czech Technical University in Prague16627 Prague 6Czech Republic Goethe University FrankfurtMax-von-Laue-Straße 160438 Frankfurt am MainGermany GSI Helm.oltzzentrum.für Schwerionenforschung Gm.H Planckstraße 164291 DarmstadtGermany Focused Energy Gm.H Im Tiefen See 4564293 DarmstadtGermany National Research Nuclear University m.PhI Kashirskoe shosse 31115409 MoscowRussian Federation Lebedev Physical Institute RAS Leninskiy Prospekt 53119991 MoscowRussian Federation Heinrich-Heine-University Düsseldorf Universitätsstrasse 1DüsseldorfGermany Joint Institute for High Tem.eratures RASIzhorskaya st.13Bldg.2125412 MoscowRussian Federation m.scow Institute of Physics and Technology Institutskiy Pereulok 9141700 DolgoprudnyRussia

Directed x-rays produced in the interaction of sub-picosecond laser pulses of m.derate relativistic intensity with plasm. of near-critical density are investigated. Synchrotron-lik. (betatron) radiation occurs in the process of direct laser acceleration (DLA) of electrons in a relativisticlaser channel when the electrons undergo transverse betatron oscillations in self-generated quasi-static electric and m.gnetic fields. In anexperim.nt at the PHELIX laser system. high-current directed beam. of DLA electrons with a m.an energy ten tim.s higher than the ponderom.tive potential and m.xim.m.energy up to 100 m.V were m.asured at 10^(19) W/cm.(2)laser intensity. The spectrum.of directed x-raysin the range of 5–60 k.V was evaluated using two sets of Ross filters placed at 0°and 10°to the laser pulse propagation axis. The differential x-ray absorption m.thod allowed for absolute m.asurem.nts of the angular-dependent photon fluence. We report 10^(13) photons/sr withenergies >5 k.V m.asured at 0°to the laser axis and a brilliance of 10^(21) photons s^(−1) m.^(−2) m.ad−2(0.1%BW)−1. The angular distributionof the em.ssion has an FWHm.of 14°–16°. Thank. to the ultra-high photon fluence, point-lik. radiation source, and ultra-short em.ssiontim., DLA-based k.V back.ighters are prom.sing for various applications in high-energy-density research with k.lojoule petawatt-class laserfacilities.

关键词： laser acceleration critical

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Superior rectus/levator com.lex in acquired anophthalm.c sock.t repaired with spheric im.lant—a com.uted tom.graphy scan and topographic study

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International Journal of Ophthalm.logy(English edition) 2024年第8期17卷 1483-1488页

作者： Shaik.a Al Eid Ham.d m.AlSulaim.n Sahar m.Elk.am.ry Osam. Al Sheik. Alicia Ferrero-Galindo Rajiv k.ndek.ar Silvana A Schellini Oculoplastic Division King Khaled Eye Specialist HospitalRiyadh 11462Saudi Arabia Radiology Division King Khaled Eye Specialist HospitalRiyadh 11462Saudi Arabia Departm.nt of Diagnostic Radiology Mansoura Faculty of MedicineMansoura 35511Egypt University Hospital Rio Hortega Valladolid 47012Spain Research Departm.nt King Khaled Eye Specialist HospitalRiyadh 11462Saudi Arabia Ophthalm.logy Departm.nt Medical SchoolState University of Sao PauloBotucatu 18618-687Brazil

AIm.To determ.ne whether the levator palpebrae superioris(LPS)/superior rectus(sr)m.scle com.lex,can influence the position of the upper lid and fornix in acquired anophthalm.c ***:This com.arative non-random.zed and non-interventional study included retrospective data of 21 patients with unilateral acquired anophthalm.c sock.ts repaired with spheric ***-resolution com.uted tom.graphy(CT)m.asurem.nts of the LPm.sr m.scle com.lex and clinical topographic position of the upper lid,superior and inferior fornix depth in prim.ry gaze position were *** data were presented as frequency and percentage proportions and quantitative variables com.aring the sock.t m.asurem.nts with the norm.l contralateral orbit was statistically analyzed using non-param.tric tests considering Pm.c orbits had a significantly shorter LPS length(P=0.01)and significantly thick.r sr(P=0.02)than the norm.l *** was present in anophthalm.c sock.ts but not in norm.l orbits(P=0.002),while levator function was norm.l in both(P>0.05,all com.arisons).The superior fornix depth was sim.lar in the anophthalm.c sock.t and the contralateral norm.l orbit(P=0.192)as well the inferior fornix depth(P=0.351).CONCLUSION:Acquired anophthalm.c sock.ts repaired with spheric im.lants have shorter LPS,thick.r sr,and m.re lagophthalm.s than norm.l *** relationship of the LPS and sr with other orbital structures,associated with passive or active forces acting in the final position of the lids and external ocular prosthesis should be further investigated.

关键词： anophthalm.c sock.t spheric im.lant levator palpebrae superioris superior rectus lagophthalm.s fornix depth

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