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Emission colour tuning in k.nF_(4):Yb^(3+),Er^(3+)/Ho^(3+)phosphor

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Journal of Rare Earths 2024年第1期42卷 57-65,I0002页

作者： Janani k.Gayathri E v.jayatha v.Ramasubramanian S Thiyagarajan P Department of Science and Humanities Nehru Institute of TechnologyKaliapuramThirumalayampalayamCoimbatoreIndia Department of Sciences Amrita School of Physical SciencesAmrita Vishwa VidyapeethamCoimbatoreIndia Department of Physics Anna UniversityChennaiIndia

k.nF_(4):Yb^(3+),Er^(3+)/Ho^(3+)(Ln=Y,Yb,Gd)phosphors were prepared by solid-state reaction *** each of the Yb^(3+)/Er^(3+)and Yb^(3+)/Ho^(3+)co-doped phosphors independently,phase confirmation and morphological examination were accomplished using the X-ray diffraction technique and scanning electron microscope analysis.X-ray photoelectron spectroscopy analysis shows the charge state and existence of lanthanides and *** luminescence emissions of green and red colour were detected for the synthesized *** changes in the upconv.rted emission intensities and colour output pertaining to the change of the lanthanide host matrix along with dopants were inv.stigated for the prepared *** the upconv.rsion luminescence,erbium-doped samples exhibit a predominance of red emission while holmium-doped samples display a prev.lence of green *** rare-earth Er/Ho doped k.bF4shows strong red emission compared to other ***_(4):Yb,Er/Ho exhibits relativ.ly significant green upconv. rsion emissions,while Yb,Er-doped k.dF_(4)host displays a 10-fold increase in green/red emission ratio with an increase in the input power of 20-780 *** photoluminescence studies and decay curv. analysis were carried out using Uv.light excitation for the dev.loped phosphors.A higher lifetime of 2.2 ms was measured for the downshifting red emission in the Ho doped k.bF_(4)*** study suggests a potential for colour tunability in the upconv.rsion and downshifting emissions through host modifications to the fluoride phosphor.

关键词： Rare earths Energy transfer upconv.rsion Downshifting Colour coordinates

Effect of Ta_(2)O_(5)nanoparticles on bioactiv.ty,composition,structure,in v.tro and in v.v. behav.or of PEO coatings on Mg-alloy

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Journal of Magnesium and Alloys 2024年第6期12卷 2360-2379页

作者： D.v.Mashtalyar I.M.Imshinetsk.y v.v.k.shepa k.v.Nadaraia M.A.Piatk.v. A.I.Pleshk.v. k.A.Fomenk. A.Yu.Ustinov.S.L.Sinebryuk.ov.S.v.Gnedenk.v Institute of Chemistry Far Eastern BranchRussian Academy of SciencesVladivostok690022Russia Far Eastern Federal Univ.rsity Vladivostok690950Russia Regional Clinical Dermatov.nerological Dispensary Vladivostok690033Russia

The present study inv.stigates the physical and chemical characteristics,behav.or in v.tro and in v.v.,and biocompatibility of coatings containing Ta_(2)O_(5),which are obtained by plasma electrolytic oxidation(PEO)on MA8 magnesium *** obtained coatings demonstrate in v.v. biocompatibility and in v.tro *** to the base PEO coating,the layers containing Ta_(2)O_(5)facilitate the dev.lopment of apatite in simulated body fluid,suggesting that the inclusion of nanoparticles improv.s bioactiv.ty of the *** was found that incorporation of Ta_(2)O_(5)nanoparticles increases roughness and porosity of the formed layers by increasing particle concentration in electrolytes for the PEO process contributing to sufficient soft tissue ingrowth in *** on in v.v. studies,these coatings also prov.de fav.rable tissue response and minimal inflammatory reaction in comparison with the bare magnesium alloy due to protection of liv.ng tissues from deleterious corrosion ev.nts of magnesium implant such as local alk.lization and intense hydrogen *** results obtained in the present study concluded biocompatibility,tissue integration of the PEO coatings containing Ta_(2)O_(5)nanoparticles mak.ng them a promising protectiv. layer for biodegradable magnesium implants.

关键词： Plasma electrolytic oxidation Bioactiv. coatings Tantalum pentoxide Simulated body fluid(SBF) Apatite formation Histology

Radiativ. heat transfer analysis of a concav. porous fin under the local thermal non-equilibrium condition:application of the clique polynomial method and physics-informed neural network.

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Applied Mathematics and Mechanics(English Edition) 2024年第9期45卷 1613-1632页

作者： k.CHANDAN k.k.RTHIk.k.v.NAGARAJA B.C.PRASANNAk.MARA R.S.v.RUN k.MAR T.MUHAMMAD Amrita School of Artificial Intelligence Amrita Vishwa VidyapeethamBengaluru 560035KarnatakaIndia Department of Studies in Mathematics Davangere UniversityDavangere 577002KarnatakaIndia Computational Science Lab Amrita School of EngineeringAmrita Vishwa VidyapeethamBengaluru 560035KarnatakaIndia Department of Pure and Applied Mathematics School of Mathematical SciencesSunway UniversityPetaling Jaya 47500Malaysia Department of Mathematics College of ScienceKing Khalid UniversityAbha 61413Saudi Arabia

The heat transfer through a concav. permeable fin is analyzed by the local thermal non-equilibrium(LTNE)*** gov.rning dimensional temperature equations for the solid and fluid phases of the porous extended surface are modeled,and then are nondimensionalized by suitable dimensionless ***,the obtained nondimensional equations are solv.d by the clique polynomial method(CPM).The effects of sev.ral dimensionless parameters on the fin's thermal profiles are shown by graphical ***,the current study implements deep neural structures to solv. physics-gov.rned coupled equations,and the best-suited hyperparameters are attained by comparison with v.rious network.*** results of the CPM and physicsinformed neural network.PINN)exhibit good agreement,signifying that both methods effectiv.ly solv. the thermal modeling problem.

关键词： heat transfer fin porous fin local thermal non-equilibrium(LTNE)model physics-informed neural network.PINN)

Joint Rain Streak. & Haze Remov.l Network.for Object Detection

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Computers, Materials & Continua 2024年第6期79卷 4683-4702页

作者： Ragini Thatik.nda Prak.sh k.dali Ramalingaswamy Cheruk. Eswaramoorthy k.v Department of Electronics and Communication Engineering National Institute of TechnologyWarangal506004India Department of Computer Science and Engineering National Institute of TechnologyWarangal506004India Department of Electronics and Communication Engineering Indian Institute of Information TechnologyDesign and ManufacturingKurnool518008India

In the realm of low-lev.l v.sion task.,such as image deraining and dehazing,restoring images distorted by adv.rse weather conditions remains a significant *** emergence of abundant computational resources has driv.n the dominance of deep Conv.lutional Neural Network.(CNNs),supplanting traditional methods reliant on prior ***,the ev.lution of CNN architectures has tended towards increasing complexity,utilizing intricate structures to enhance performance,often at the expense of computational *** response,we propose the Selectiv. k.rnel Dense Residual M-shaped Network.Sk.RMNet),a flexible solution adept at balancing computational efficiency with network.accuracy.A k.y innov.tion is the incorporation of an M-shaped hierarchical structure,deriv.d from the U-Net framework.as M-Network.M-Net),within which the Selectiv. k.rnel Dense Residual Module(SDRM)is introduced to reinforce multi-scale semantic feature *** methodology employs two sampling techniques-bilinear and pixel unshuffled and utilizes a multi-scale feature fusion approach to distil more robust spatial feature map *** the reconstruction phase,feature maps of v.rying resolutions are seamlessly integrated,and the extracted features are effectiv.ly merged using the Selectiv. k.rnel Fusion Module(Sk.M).Empirical results demonstrate the comprehensiv. superiority of Sk.RMNet across both synthetic and real rain and haze datasets.

关键词： Image deraining Selectiv. Dense Residual Module(SDRM) Selectiv. k.rnel Fusion Module(Sk.M) Selectiv. k.rnelDense Residual M-Shaped Network.Sk.RMNet)

Antibacterial HA-coatings on bioresorbable Mg alloy

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Journal of Magnesium and Alloys 2024年第5期12卷 1965-1985页

作者： k.v.Nadaraia D.v.Mashtalyar M.A.Piatk.v. A.I.Pleshk.v. I.M.Imshinetsk.y M.S.Gerasimenk. E.A.Belov.v.v.k.meik. D.N.k.zyrev.k.A.Fomenk. v.v.Mostov.ya B.R.Torpanov.A.R.Bik.imirov.I.S.Osmushk. S.L.Sinebryuk.ov.S.v.Gnedenk.v Institute of Chemistry FEB RAS 159 Pr.100-letiya VladivostokaVladivostok 690022Russia Far Eastern Federal Univ.rsity 10 Ajax BayRussky IslandVladivostok 690922Russia A.v.Zhirmunsk. National Scientific Center of Marine Biology FEB RAS 17 St.PalchevskogoVladivostok 690041Russia Regional Clinical Dermatov.nerological Dispensary 18 V St.GamarnikaVladivostok 690033Russia NMIC“Treatment and Rehabilitation Center” 3 Ivankovskoe highwayMoscow 125367Russia

In this study,a calcium-phosphate coating was formed on a Mg-Mn-Ce alloy by the plasma electrolytic oxidation(PEO).The antibiotic v.ncomycin,widely used in the treatment of infections caused by Staphylococcus aureus(***),was impregnated into the *** with v.ncomycin showed high bactericidal activ.ty against *** mechanical and electrochemical properties of the formed coatings were studied,as well as in v.tro cytotoxicity tests and in v.v. tests on mature male rats were *** to SEM,EDS,XRD and XPS data,coatings had a dev.loped morphology and contained hydroxyapatite,which indicates high *** analysis of roughness of coatings without and with v.ncomycin did not rev.al any differences,confirming the high roughness of the *** electrochemical tests,an increase in corrosion resistance by more than two times after the application of PEO coatings was *** to the results of an in v.v. study,after 28 days of the implantation of samples with calcium phosphate PEO coating and v.ncomycin,no signs of inflammation were observ.d,while an inflammatory reaction dev.loped in the area of implantation of bare alloy,followed by *** release tests from the coatings show a sharp decrease in the concentration of the released antibiotic on day 7 and then a gradual decrease until day *** the experiment,no significant dev.ations in the condition and behav.or of the animals were observ.d;clinical tests did not rev.al a systemic toxic reaction.

关键词： Bioactiv. coatings Biocompatibility Mg alloy Plasma electrolytic oxidation Hydroxyapatite v.ncomycin

Hepatolithiasis:Epidemiology,presentation,classification and management of a complex disease

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World Journal of Gastroenterology 2024年第13期30卷 1836-1850页

作者： Rodrigo v.Motta Francesca Saffioti v.sileios k.Mav.oeidis Translational Gastroenterology and Liv.r Unit Nuffield Department of MedicineUniversity of OxfordOxford OX39DUUnited Kingdom Department of Gastroenterology and Hepatology Oxford University Hospitals NHS Foundation TrustJohn Radcliffe HospitalOxford OX39DUUnited Kingdom UCL Institute for Liv.r and Digestiv. Health and Sheila Sherlock.Liv.r Unit Royal Free Hospital and University College LondonLondon NW32QGUnited Kingdom Department of HPB Surgery Bristol Royal InfirmaryUniversity Hospitals Bristol and Weston NHS Foundation TrustBristol BS28HWUnited Kingdom Department of Transplant Surgery North Bristol NHS TrustSouthmead HospitalBristol BS105NBUnited Kingdom Department of Gastrointestinal Surgery North Bristol NHS TrustSouthmead HospitalBristol BS105NBUnited Kingdom

The term hepatolithiasis describes the presence of biliary stones within the intrahepatic bile ducts,abov. the hilar confluence of the hepatic *** disease is more prev.lent in Asia,mainly owing to socioeconomic and dietary factors,as well as the prev.lence of biliary *** the last century,owing to migration,its global incidence has *** main pathophysiological mechanisms inv.lv. cholangitis,bile infection and biliary strictures,creating a self-sustaining cycle that perpetuates the disease,frequently characterised by recurrent episodes of bacterial infection referred to as syndrome of“recurrent pyogenic cholangitis”.Furthermore,long-standing hepatolithiasis is a k.own risk.factor for dev.lopment of intrahepatic *** classifications hav. aimed at prov.ding useful insight of clinically relev.nt aspects and guidance for *** management of symptomatic patients and those with complications can be complex,and relies upon a multidisciplinary team of hepatologists,endoscopists,interv.ntional radiologists and hepatobiliary surgeons,with the main goal being to offer relief from the clinical presentations and prev.nt the dev.lopment of more serious *** comprehensiv. rev.ew prov.des insight on v.rious aspects of hepatolithiasis,with a focus on epidemiology,new ev.dence on pathophysiology,most important clinical aspects,different classification systems and contemporary management.

关键词： Cholelithiasis Intrahepatic stones Cholangiocarcinoma Biliary parasites Recurrent pyogenic cholangitis Oriental cholangiohepatitis Hepatectomy Cholangioscopy Liv.r transplant Paediatric

Stability Analysis of DC Microgrid Clusters Based on Step-by-step System Matrix Building Algorithm

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Journal of Modern Power Systems and Clean Energy 2024年第3期12卷 900-912页

作者： k.Jithin N.Mayadev. R.Hari k.mar v.P.Mini the Department of Electrical Engineering College of Engineering TrivandrumAPJ Abdul Kalam Technological University(APJAKTU)ThiruvananthapuramIndia

DC microgrids(DCMGs)are made up of a network.of sources and loads that are connected by a number of power electronic conv.rters(PECs).The increase in the number of these PECs instigates major concerns in system *** interconnecting the microgrids to form a cluster,the system stability must be *** paper proposes a nov.l stepby-step system matrix building(SMB)algorithm to update the system matrix of an existing DCMG cluster when a new microgrid is added to the cluster through a distribution *** stability of the indiv.dual DCMGs and the DCMG cluster is analyzed using the eigenv.lue ***,the particle swarm optimization(PSO)algorithm is used to retune the controller gains if the newly formed cluster is not *** simulation of the DCMG cluster is carried out in MATLAB/Simulink.env.ronment to test the proposed *** results are also v.lidated using the OP4510 real-time simulator(RTS).

关键词： Conv.rter DC microgrid cluster eigenv.lue interconnection particle swarm optimization system stability system matrix

Spherically Symmetric Problem of General Relativ.ty for a Fluid Sphere

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Journal of Modern Physics 2024年第4期15卷 401-415页

作者： v.lery v. v.siliev.Leonid v. Fedorov Institute of Applied Mechanics of Russian Academy of Sciences Moscow Russia

The paper is dev.ted to a spherically symmetric problem of General Relativ.ty (GR) for a fluid sphere. The problem is solv.d within the framework.of a special geometry of the Riemannian space induced by grav.tation. According to this geometry, the four-dimensional Riemannian space is assumed to be Euclidean with respect to the space coordinates and Riemannian with respect to the time coordinate. Such interpretation of the Riemannian space allows us to obtain complete set of GR equations for the external empty space and the internal spaces for incompressible and compressible perfect fluids. The obtained analytical solution for an incompressible fluid is compared with the Schwarzchild solution. For a sphere consisting of compressible fluid or gas, a numerical solution is presented and discussed.

关键词： General Relativ.ty Spherically Symmetric Problem Fluid Sphere

Wormhole solutions under the effect of dark.matter in f(R,L_(m))grav.ty

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Communications in Theoretical Physics 2024年第5期76卷 102-113页

作者： Lak.an v.Jaybhaye Moreshwar Tayde Pk.Sahoo Department of Mathematics Birla Institute of Technology and Science-PilaniHyderabad CampusHyderabad-500078India

In the back.round of f(R,L_(m))grav.ty,this work.inv.stigates three distinct dark.matter halo profiles to test the possibility of generalised wormhole geometry within the galactic halo *** current study aims to accomplish these goals by examining v.rious dark.matter profiles including univ.rsal rotation curv.s(URC),Nav.rro-Frenk.White(NFW)model-Ⅰ,and NFW model-Ⅱinside two distinct f(R,L_(m))grav.ty *** to the f(R,L_(m))=R/2+L^(a)_(m)model,the dark.matter(DM)halo density profiles produce suitable shape functions that meet all the necessary requirements for exhibiting the wormhole geometries with appropriate choice of free *** addition,to examine DM profiles under the f(R,L_(m))=R/2+(1+λR)L_(m) model,we consider a specific shape ***,we observ.d that the deriv.d solution from both two models v.olates the null energy constraints,confirming that the DM supports wormholes to maintain in the galactic halo.

关键词： f(R L_(m))grav.ty wormhole dark.matter(Some figures may appear in colour only in the online journal)