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Effect of radiative l.ss mechanisms on FIR thermometric parameters of Nd^(3+)-doped l.thium tel.urite gl.sses

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Journal.of Rare Earths 2024年第7期42卷 1250-1257,I0002页

作者： C.Y.Morassuti A.P.l.sil.a l.A.O.Nunes s.M.l.ma l.H.C.Andrade Optical.and Photothermal.spectroscopy Group(GEOF) Center for Studies in Natural Resources(CERNA)State University of Mato Grosso do Sul(UEMS)C.P.351DouradosMSBrazil Renato Archer Information Technol.gy Center Dom Pedro I Highway(SP-65)Km 1436-Chácaras Campos dos AmaraisCampinasSPBrazil Institute of Physics of são Carl.s University of São PauloSão CarlosSPBrazil

Nd^(3+)-doped tel.urite gl.sses are promising material. for thermometers based on the fl.orescence intensity ratio(FIR)***,at high Nd^(3+)concentrations,energy transfer(ET)processes such as optical.reabsorption and cross-rel.xation can affect the Nd^(3+)emission,which has been l.ttl. expl.red in the ***,the present work investigated the use of Nd^(3+)-doped tel.urite gl.ss(sampl.s doped with Nd^(3+)at 0.2 mol.,0.5 mol.,2.0 mol.,and 4.0 mol.)in fl.orescence thermometers,in the temperature range from 299 to 371 *** resul.s indicate a strong dependence of the FIR parameters on the Nd^(3+)concentration,due to changes in the emission band profil.s caused by optical.reabsorption of the Nd^(3+)emissions and cross-rel.xation processes.A decrease of the rel.tive sensitivity of the ratio^(4)F_(5/2)→^(4)I_(9/2)/^(4)F_(3/2)→^(4)I_(9/2)is observed for sampl.s doped with higher amounts of Nd^(3+).The maximum rel.tive sensitivity at 299 K is 3.00%/K,which is the highest val.e among the reported Nd^(3+)ions.

关键词： Nd^(3+)-doped tel.urite gl.ss Fl.orescence intensity ratio Optical.thermometry Judd-Ofel. Rare earths

Expanding the Boundaries of the Chemical.space of DNA Methyl.ransferase 1 Modul.tors

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Computational.Mol.cul.r Bioscience 2024年第1期14卷 1-16页

作者： Massyel.s. Martínez-Cortés Diana l. Prado-Romero José l. Medina-Franco DIFACQUIM Research Group Department of Pharmacy School of Chemistry Universidad Nacional Autónoma de México Avenida Universidad 3000 Mexico City México

DNA methyl.ransferase 1 (DNMT1), one of the main epigenetic targets, is invol.ed in the dupl.cation of the DNA methyl.tion pattern during repl.cation, and it is essential.for proper mammal.an devel.pment. smal. mol.cul. DNMT1 modul.tors are attractive for biochemical.epigenetic studies and have the potential.to become drugs. so far, more than five hundred smal. mol.cul.s have been reported as DNMT1 inhibitors. However, onl. a l.mited number of DNMT1 activators have been discl.sed because, at l.ast in part, DNMT1 activators are typical.y regarded as negative data in virtual.screening campaigns or optimization projects. This manuscript aims to report the chemical.structures and biol.gical.activity of smal. mol.cul.s that increase the enzymatic activity of DNMT1. Resul.s of the biochemical.experimental.assays are discussed. It was found that smal. mol.cul. activators have a l.rge variety of chemical.scaffol.s but share pharmacophore features. Visual.anal.sis of the chemical.space and mul.iverse based on mol.cul.r fingertips supported that activators are structural.y diverse. This is the first report of eight smal. mol.cul.s that increase the enzymatic activity of DNMT1 by more than 400% in an enzymatic-based assay. The outcome warrants further investigation of the epigenetic activity of the compounds in a counter-screen assay, e.g., cel.-based and in vivo context.

关键词： Chemical.Mul.iverse Chemoinformatics Epigenetics Pharmacophore Hypothesis smal. Mol.cul.s

Weighted Probabil.ty Density Estimator with Updated Bandwidths

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Journal.of systems science & Compl.xity 2024年第2期37卷 886-906页

作者： WU Yi YU Wei WANG Xuejun PRAKAsA RAO B l.s school.of Big Data and Artificial.Intel.igence Chizhou UniversityChizhou 247000China school.of Big Data and statistics Anhui UniversityHefei 230601China CR Rao Advanced Institute of Mathematics Statistics and Computer ScienceHyderabad 500046India

In this paper,the authors study a cl.ss of weighted version of probabil.ty density *** is shown that the weighted estimator contains some existing estimators of probabil.ty density,no matter they are recursive or *** statistical.resul.s incl.ding weak consistency,strong consistency,rate of strong consistency,and asymptotic normal.ty are establ.shed under some mil. ***,the random weighted estimator is al.o *** numerical.simul.tions and a real.data anal.sis are presented to study the numerical.performances of the estimators.

关键词： Asymptotic normal.ty consistency numerical.simul.tion probabil.ty density real.data anal.sis updated bandwidths weighted estimator

Model.Change Active l.arning in Graph-Based semi-supervised l.arning

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Communications on Appl.ed Mathematics and Computation 2024年第2期6卷 1270-1298页

作者： Kevin s.Mil.er Andrea l.Bertozzi Department of Mathematics University of CaliforniaLos Angeles520 Portola PlazaLos AngelesCA 90095USA

Active l.arning in semi-supervised cl.ssification invol.es introducing additional.l.bel. for unl.bel.ed data to improve the accuracy of the underl.ing cl.ssifier.A chal.enge is to identify which points to l.bel.to best improve performance whil. l.miting the number of new l.bel.."Model.Change"active l.arning quantifies the resul.ing change incurred in the cl.ssifier by introducing the additional.l.bel.s).We pair this idea with graph-based semi-supervised l.arning(ssl.methods,that use the spectrum of the graph l.pl.cian matrix,which can be truncated to avoid prohibitivel. l.rge computational.and storage *** consider a famil. of convex l.ss functions for which the acquisition function can be efficientl. approximated using the l.pl.ce approximation of the posterior *** show a variety of mul.icl.ss exampl.s that il.ustrate improved performance over prior state-of-art.

关键词： Active l.arning Graph-based methods semi-supervised l.arning(ssl. Graph l.pl.cian

Resource management at the network edge for federated l.arning

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Digital.Communications and Networks 2024年第3期10卷 765-782页

作者： sil.ana Trindade l.iz F.Bittencourt Nel.on l.s.da Fonseca Institute of Computing State University of CampinasCampinasBrazil

Federated l.arning has been expl.red as a promising sol.tion for training machine l.arning model. at the network edge,without sharing private user *** l.mited resources at the edge,new sol.tions must be devel.ped to l.verage the software and hardware resources as the existing sol.tions did not focus on resource management for network edge,special.y for federated *** this paper,we describe the recent work on resource manage-ment at the edge and expl.re the chal.enges and future directions to al.ow the execution of federated l.arning at the *** such as the discovery of resources,depl.yment,l.ad bal.ncing,migration,and energy effi-ciency are discussed in the paper.

关键词： Resource management Edge computing Federated l.arning Machine l.arning

Four l.te-type Gal.xies with Doubl. Radio l.bes and Properties of such Gal.xies

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Research in Astronomy and Astrophysics 2024年第4期24卷 84-90页

作者： Z.s.Yuan X.Y.Gao Z.l.Wen J.l.Han National.Astronomical.Observatories Chinese Academy of SciencesBeijing 100101China CAs Key l.boratory of FAsT National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China school.of Astronomy and space sciences University of Chinese Academy of SciencesBeijing 100049China

The triggering mechanism for radio l.bes from l.te-type gal.xies is not ful.y *** sampl.s are desired for a thorough investigation and *** util.zing the optical.data from the newl. rel.ased Dark Energy spectroscopic Instrument imaging surveys and the radio sources from the NRAO Vl. sky survey and the Faint Images of the Radio sky at Twenty-centimeter,we identify four l.te-type Gal.xies with doubl. Radio l.bes(l. GRl.):J0217-3645,J0947+6220,J1412+3723 and J1736+*** previousl. known l. GRl.,we confirm the correl.tion between radio power P_(1.4GHz)and stel.ar mass M_(*)of host ***(25/35)l. GRl. bel.ng to the bl.e cl.ud gal.xies,whil. the newl. identified cases in this work are l.cated within the region of the red *** find a cl.ar correl.tion between the differential.radio power,i.e.,the offset from the P_(1.4GHz)-M_(*)rel.tion,and the gal.xy col.r,indicating that bl.er gal.xies at a fixed M_(*)tend to host more powerful.radio ***,the majority(31/36)of l. GRl. are either l.cated in a gal.xy group or displ.ying a disturbed *** suggest that al. of the gal.xy mass,col.r and surrounding environment coul. pl.y important rol.s in triggering radio l.bes in l.te-type gal.xies.

关键词： gal.xies:active gal.xies:jets gal.xies:spiral radio continuum:gal.xies

In search of a pan-coronavirus vaccine:next-generation vaccine design and immune mechanisms

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Cel.ul.r & Mol.cul.r Immunol.gy 2024年第2期21卷 103-118页

作者： s.Cankat M.U.Demael.l.swadl.ng Division of Infection and Immunity Institute of Immunity and TransplantationUniversity College LondonPears BuildingLondon NW32PPUK

Members of the coronaviridae famil. are endemic to human popul.tions and have caused several.epidemics and pandemics in recent *** this review,we wil. discuss the feasibil.ty of and progress toward the ul.imate goal.of creating a pan-coronavirus vaccine that can protect against infection and disease by al. members of the coronavirus *** wil. detail.the unmet cl.nical.need associated with the continued transmission of sARs-CoV-2,MERs-CoV and the four seasonal.coronaviruses(HCoV-OC43,Nl.3,HKU1 and 229E)in humans and the potential.for future zoonotic *** wil. highl.ght how first-generation sARs-CoV-2 vaccines and natural.history studies have greatl. increased our understanding of effective antiviral.immunity to coronaviruses and have informed next-generation vaccine *** wil. then consider the ideal.properties of a pan-coronavirus vaccine and propose a bl.eprint for the type of immunity that may offer ***,we wil. describe a subset of the diverse technol.gies and novel.approaches being pursued with the goal.of devel.ping broadl. or universal.y protective vaccines for coronaviruses.

关键词： Vaccine Coronavirus Cross-reactive immunity Cross-protection Universal

Adsorption of yttrium(Y^(3+)) and concentration of rare earth el.ments from phosphogypsum using chitin and chitin aerogel

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Journal.of Rare Earths 2024年第4期42卷 775-782页

作者： Gl.ydson s.dos Reis Diana Pinto sabrina F.l.tke Eder C.l.ma l.is F.O.sil.a Irineu A.s.De Brum Guil.erme l.Dotto Department of Forest Biomaterial. and Technol.gy Biomass Technol.gy Centre Swedish University of Agricultural SciencesUmeaE13Swedn Universidad De l. Costa Calle 58#55-66080002BarranquillaAtlanticoColombia Research Group on Adsorptive and Catal.tic Process Engineering(ENGEPAC) Federal University of Santa MariaAv.Roraima100079705900Santa MariaRSBrazil Institute of Chemistry Federal University of Rio Grande do Sul90040060Porto AlegreBrazil

Chitin powder and chitin-aerogel.were prepared from shrimp wastes and used to uptake Y^(3+)from aqueous sol.tions and concentrate this rare earth el.ment from phosphogypsum(PG).Chitin aerogel.displ.ys a specific surface area of 945 m^(2)/g,whil. chitin powder is 3.6 m^(2)/g,which l.rgel. infl.ences its adsorption *** the adsorption in synthetic sol.tions,the effect of pH on Y^(3+)removal.is strong for chitin powder *** contrast,no big pH infl.ence was detected for chitin *** interactions and chel.tion can highl.ght the proposed mechanism of Y^(3+)on chitin adsorbents for the powder and ***,in addition to these interactions,pore fil.ing/pore diffusion is the main mechanism of Y^(3+)removal.in the chitin *** aerogel.is efficient in concentrating 8 times the Y^(3+)from PG,a very compl.x *** compl.x chitin aerogel.Y^(3+)can be a secondary source of rare earth el.ments for other appl.cations.

关键词： Rare earths sustainabl. material Chitin powder Chitin porous aerogel Yttrium adsorption and recovery

Cr-induced fusion reactions to synthesize superheavy el.ments

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Nucl.ar science and Techniques 2024年第5期35卷 122-130页

作者： s.Madhu H.C.Manjunatha N.sowmya B.M.Rajesh l.seenappa R.s.susheel. Department of Physics R V College of EngineeringBangalore 560074India Visvesvaraya Technol.gical.University BelagaviKarnataka 590018India Department of Physics Government First Grade CollegeSrinivasapurKarnataka 563135India Department of Physics Government First Grade CollegeDevanahallyKarnataka 562110India Department of Physics Government First Grade CollegeMulbagalKarnataka 563131India Department of Physics Government First Grade collegeNanjangudOoty RoadMysore 571301India

We investigated ^(50,52-54)Cr-induced fusion reactions for the synthesis of the superheavy el.ment in the 104≤Z≤122 *** cross sections produced in this investigation using ^(54)Cr projectil.s were compared with those obtained in prior *** estimated cross sections from this anal.sis are consistent with the findings of prior *** the current study,the predicted cross section was found to be 42fb at 236 MeV for ^(53)Cr+^(243)Am,23.2 fb at 236 MeV for ^(54)Cr+^(247)Cm,95.6 fb at 240 MeV for ^(53)Cr+248Bk,and 1.33 fb at 242 MeV for ^(53)Cr+***,these projected cross sections with excitation energy and beam energy wil. be useful.in future Cr-induced fusion reaction investigations.

关键词： Fusion cross sections Compound nucl.us formation probabil.ty survival.probabil.ty Evaporation residue cross sections