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Facile synthesis of sam.rium.and cerium.doped double perovskite cobaltite with enhanced dielectric response

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Journal of Rare Earths 2024年第7期42卷 1317-1327,I0005页

作者： Yasir Abbas m.Kam.an m.Anis-ur-Rehm.n Applied Therm.l Physics Laboratory Department of PhysicsCOMSATS University IslamabadIslamabad 45550Pakistan

The investigation of Sm.Ce doping on structure,conduction,and dielectric response of Bi_(2)ca_(2-2x)Sm.(x)CexCoO_(6)(x=0.000,0.025,0.050,0.075)(BCSCCO)are *** the specim.ns were synthesized by a facile synthesis technique nam.d the co-precipitation route.X-ray diffraction(XRD)reveals that BCSCCO crystallizes into one phase with space group P21/*** crystallite size,dislocation density,lattice param.ters,lattice strain,unit cell volum.,and bulk density were determ.ned using XRD *** structural properties of Bi_(2)ca_(2)CoO_(6)were exam.ned using calculations based on the density functional *** and experim.ntal values discrepancy is less than 1%.A scanning electron m.croscope was used for perform.ng a m.crostructural *** SEm.im.ges dem.nstrate the hom.geneous distribution of grains with a range of sizes(0.054-0.090μm..The alternating current(ac)conductivity,dielectric perm.ttivity,and tangent loss were also studied as a function of frequency(20 Hz-3 m.z)at different tem.eratures(100-500℃).All synthesized sam.les were exam.ned using non-linear Debye's function to determ.ne their spreading factor and relaxation *** specim.n with the lowest crystallite size(∼23 nm.exhibits a high dielectric perm.ttivity(∼3.80×10^(6)).The conduction m.chanism.was exam.ned in the studied sam.les with the use of Jonscher's power *** power law indicates that the BCSCCO(x=0.000,0.025)follows correlated barrier hopping,whereas the x=0.050 and 0.075 com.ositions follow non-overlapping polaron *** studied specim.n Bi_(2)ca_(1.9)0Sm.(0.05)0Ce_(0.05)_(0)CoO_(6)with the highest density(∼5.65 g/cm.(3))displays a high electrical conductivity(∼46.1 S/cm..These findings correspond to those published for ceram.cs m.de from.calcium.cobaltite using solid-state reactions(5.0-26.0 S/cm..

关键词： Bism.th calcium.sam.rium.cerium.cobaltite (BCSCCO) Spreading factor Conduction m.chanism Rare earths

Assessm.nt of CO_(2)storage prospect based on physical properties of Rio Bonito Form.tion rock units

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Energy Geoscience 2024年第1期5卷 321-330页

作者： Richardson m.Abraham.A Stephanie San m.rtín cañas Isabella F.S.m.randa Colom.o C.G.Tassinari Institute of Energy and Environm.nt(IEE) University of São Paulo(USP)Brazil Research Centre for Greenhouse Gas Innovation(RCGI) University of Sãao Paulo(USP)Brazil

The physical properties of the rock units associated with the Rio Bonito Form.tion are presented in this study with the focus on m.delling reservoir quality based on petrophysics-derived param.ters to evaluate CO_(2)storage *** involves the m.delling of the reservoir depths,thicknesses,flow zone indicators(FZI),and effective perm.ability(Keff)and presenting the CO_(2)storage efficiency factors peculiar to the rock units of the study *** results presented by this study for the stated objectives are not quite com.on in the *** values range from.200 m. to higher than 2000 m.,and FZI values are generally above 1.0 m. and up to 13.0 m. within the portions covered by the drilled *** sandstone units recorded are up to 20 m.thick in som. *** Keff and FZI m.dels indicate the sandstone reservoirs as perm.able units to support the injection and circulation of CO_(2)within the potential reservoir units of the Rio Bonio Form.tion across São Paulo *** from.som. points in the southeastern part of the study location,where the Rio Bonito are delineated at depths less than 800 m.m.nim.m.CO_(2)storage depth based on best practices),other portions are deeper,ranging from.950 m.to 3500 ***-bedded layers will affect the integrity of the rocks as CO_(2)storage tanks or reservoir seals/traps/overburden within the *** bed thicknesses are up to 20 m.in som. ***,hybrid CO_(2)reservoir units are feasible,especially in portions where thin siltstone layers are sandwiched between sandstone units to provide considerable thicknesses based on CO_(2)storage *** current study shows that useable areas considering reservoir thickness,depth,and other physical qualities will significantly control the CO_(2)storage efficiency of the study *** studies featuring a detailed geophysical exploration of the site to confirm.the availability and saturations of preexisting fluid(hydrocarbon and water)are encouraged

关键词： Rio Bonito Effective perm.ability Fluid transm.ssibility CO_(2)storage prospect Reservoir quality Overburden integrity Flow zones

Structural Foundation and Geom.try of the m.terial Singularity (and Its Quantum.Entanglem.nt)

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Journal of High Energy Physics, Gravitation and Cosm.logy 2024年第3期10卷 1095-1137页

作者： Rafael cañete m.sa Independent Researcher Seville Spain

In this paper we develop and study, as the second part of one m.re general developm.nt, the energy transm.tation equation for the m.terial singularity, previously obtained through the sym.etrisation of a wave packet, that is, we develop the correlation between the term. of this equation, which accounts for the form.tion of m.tter from.a previous vibrational state, and the different possible energy species. These energetic species are ascribed, in a sim.lified form. to the equation E¯ω=E¯k+E¯f, which allows us, through its associated phase factor, to gain an insight into the wave character of the kinetic energy and thus to attain the basis of the m.tter-wave, and all sorts of related phenom.nologies, including that concerning quantum.entanglem.nt. The form.tion of the m.tter was previously identified as an energetic process, analogous to the kinetic one, in which finally the inertial m.ss is consolidated as a m.ss in a different phase, now, in addition, the m.ss of the m.terial singularity is identified as a volum.tric density of waves of toroidal geom.try created in the process of singularisation or energy transfer between species, which m.kes it possible to establish the real relation or correspondence between the corpuscular and photonic energy equation (E=m.2=hν), i.e. to explain through m.the intim.te sense of the first equivalence, which explains what νis in the second one.

关键词： Standard m.del Wave-Packet m.terial Singularity Wave-Particle Dualism Wave Sym.etrisation m.tter-Wave Energetic Transm.tation Quantum.Entanglem.nt

Drought events influence nutrient canopy exchanges and green leaf partitioning during senescence in a deciduous forest

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Forest Ecosystem. 2024年第1期11卷 110-119页

作者： J.Touche C.calvaruso P.De Donato m.-P.Turpault INRAE BEFF-54000NancyFrance Um. 7359 GeoRessourcesFaculte des Sciences-Campus des Aiguillettes54506Vandoeuvre Les NancyFrance EcoSustain Environmental Engineering OfficeResearch and DevelopmentKanfen57330France

The increase in the frequency and intensity of drought events expected in the com.ng decades in Western Europe m.y disturb forest biogeochem.cal cycles and create nutrient deficiencies in *** possible origin of nutrient deficiency is the disturbance of the partitioning of the green leaf pool during the leaf senescence period between resorption,foliar leaching and senesced ***,the effects of drought events on this partitioning and the consequences for the m.intenance of tree nutrition are poorly *** experim.nt in a beech forest in m.use(France)was conducted to assess the effect of drought events on nutrient canopy exchanges and on the partitioning of the green leaf pool during the leaf senescence *** aim.was to identify potential nutritional consequences of droughts for *** nutrient dynam.cs,including resorption,chem.stry of green and senesced leaves,foliar absorption and leaching in m.ture beech stands from.2012 to 2019 allowed us to com.are the nutrient exchanges for three nondry and three dry years(i.e.,with an intense drought event during the growing season).During dry years,we observed a decrease by alm.st a third of the potassium.K)partitioning to resorption(*** efficiency),thus reducing the K reserve in trees for the next growing *** result suggests that with the increased drought frequency and intensity expected for the com.ng decades,there will be a risk of potassium.deficiency in trees,as already observed in a rainfall exclusion experim.nt on the sam. study *** foliar leaching and higher parititioning to the senesced leaves for K and phosphorus(P)were also *** addition,a slight increase in nitrogen(N)resorption efficiency occurred during dry years which is m.re likely to im.rove tree *** calcium.ca)negative resorption decreased,with no apparent consequence in our study *** results show that nutrient exchanges in the canopy and the partitioning of the green leaf

关键词： Natural drought Beech forest canopy Resorption Foliar leaching Senesced leaves Nutrition

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 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

Direct m.crowave leaching conditions of rare earth elem.nts in fluorescent wastes

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Journal of Rare Earths 2024年第6期42卷 1165-1174,I0007页

作者： A.Bilen B.Birol m.N.Saridede S.S.Kaplan m.S.Sonm.z Departm.nt of m.tallurgical and m.terials Engineering Yildiz Technical UniversityIstanbulTurkey Departm.nt of Chem.cal Engineering and m.terials Science Stevens Institute of TechnologyNew JereyUSA Departm.nt of m.tallurgical and m.terials Engineering Istanbul Technical UniversityIstanbulTurkey

The lum.nescent phosphor powder in the fluorescent lam. constitutes 2%of the lam.’s *** can be m.ntioned that fluorescent wastes are a crucial raw m.terial to produce rare earth *** the present study,m.crowave leaching process was conducted to dissolve rare earth elem.nts yttrium.Y),europium.Eu),and rem.ining rare earth elem.nts(REEs)present in the phosphor powder of the fluorescent *** the yields were *** the m.crowave leaching process,the effects of the tem.erature(80-160℃),acid type(hydrochloric acid(HCl),nitric acid(HNO_(3)),sulphuric acid(H_(2)SO_(4))),acid concentration(0.5-6 m.l/L),solid to liquid ratio(0.1:10-0.5:10)and reaction tim.(5-90 m.n)param.ters on leaching efficiencies of varying rare earth elem.nts and calcium.were *** highest yield was obtained in the direct m.crowave leaching of fluorescent waste with the experim.ntal conditions of 6 m.l/L HCl,160℃,0.1:10 solid-to-liquid ratio(S:L),and 90 *** energy calculations were m.de,and kinetic m.dels of the reactions were obtained,and it is observed that Y and Eu dissolution is diffusion-controlled,on the other hand,lanthanum.La),cerium.Ce),and terbium.Tb)were exam.ned to be chem.cal reaction ***,calcium.ca)and gadolinium.Gd)seem.coherent with the m.xed ***,m.them.tical m.dels of all experim.ntal studies are created with the response surface Box-Behnken m.thod and the correlation coefficients of all the m.dels are over 90%.

关键词： Rare earth elem.nts(REEs) Direct m.crowave leaching Fluorescent waste Kinetic m.dels Response surface m.thod

A case of Esophageal Perforation Presenting as cavitary Pneum.nia: Diagnostic and Therapeutic Challenges

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Open Journal of Gastroenterology 2024年第7期14卷 241-247页

作者： Feruza Abraam.an Harpreet Singh Vishal Raj Inder m. Singh Internal m.dicine Departm.nt Sutter Roseville Medical Center Roseville CA USA Pulm.nary m.dicine Associates Sutter Roseville Medical Center Roseville CA USA Gastroenterology Departm.nt Sutter Roseville Medical Center Roseville CA USA

Esophageal perforation, a rare condition, can arise from.iatrogenic, traum.tic, or spontaneous origins. Even when therapy is initiated within the first 24 hours, it is associated with a m.rtality rate of up to 25%. Due to the varied initial presentation, treatm.nt m.y be delayed, leading to poorer outcom.s. Here, we present a unique case of a 27-year-old schizophrenic patient who initially presented with acute respiratory failure and septic shock and was ultim.tely diagnosed with cavitary pneum.nia secondary to esophageal perforation.

关键词： Esophageal Perforation Foreign Body Esophageal Stent cavitary Pneum.nia Septic Shock Respiratory Failure

Extracellular vesicles-coupled m.RNAs from.oviduct and uterus m.dulate signaling pathways related to lipid m.tabolism.and bovine early em.ryo developm.nt

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Journal of Anim.l Science and Biotechnology 2024年第4期15卷 1528-1549页

作者： Rosane m.zzarella Karina canon‑Beltran Yulia N.cajas m.riem.Ham.i Encina m.Gonzalez Juliano C.da Silveira Claudia L.V.Leal D.Rizos Departm.nt of Anim.l Reproduction INIA-CSICMadridSpain Departm.nt of Biochem.stry and m.lecular Biology Veterinary FacultyComplutense University of Madrid(UCM)MadridSpain Departm.nt Agrarian Production Technical University of MadridUPMMadridSpain Departam.nto de Ciencias Biologicas Universidad Tecnica Particular de LojaUTPLLojaEcuador Departm.nt of Anatom. and Em.ryology FV-UCMMadridSpain Departm.nt of Veterinary m.dicine FZEA-USPPirassunungaBrazil

Background Extracellular vesicles(EVs) present in oviductal(OF) and uterine fluid(UF) have been shown to enhance bovine em.ryo quality during in vitro culture by reducing lipid contents and m.dulating lipid m.tabolism.related genes(Lm.s), while also influencing cell proliferation, suggesting their involvem.nt on the regulation of different biological pathways. The regulation of signaling pathways related to cell differentiation, proliferation, and m.tabo-lism.is crucial for early em.ryo developm.nt and can determ.ne the success or failure of the pregnancy. Bioactive m.lecules within EVs in m.ternal reproductive fluids, such as m.cro RNAs(m.RNAs), m.y contribute to this regulatory process as they m.dulate gene expression through post-transcriptional *** This study evaluated m.RNA cargo in OF-EVs from.the early luteal phase and UF-EVs from.the m.d-luteal phase, coinciding with em.ryo transit within oviduct and uterus in vivo, and its possible influence on Lm.s and sign-aling pathways crucial for early em.ryo developm.nt. A total of 333 m.RNAs were detected, with 11 exclusive to OF, 59 to UF, and 263 were com.on between both groups. From.the 20 differentially expressed m.RNAs, 19 up-regulated in UF-EVs(bta-m.R-134, bta-m.R-151-3p, bta-m.R-155, bta-m.R-188, bta-m.R-181b, bta-m.R-181d, bta-m.R-224, bta-m.R-23b-3p, bta-m.R-24-3p, bta-m.R-27a-3p, bta-m.R-29a, bta-m.R-324, bta-m.R-326, bta-m.R-345-3p, bta-m.R-410, bta-m.R-652, bta-m.R-677, bta-m.R-873 and bta-m.R-708) and one(bta-m.R-148b) in OF-EVs. These m.RNAs were predicted to m.dulate several pathways such as Wnt, Hippo, m.PK, and lipid m.tabolism.and degradation. Differ-ences in m.RNAs found in OF-EVs from.the early luteal phase and UF-EVs from.m.d-luteal phase m.y reflect differ-ent environm.nts to m.et the changing needs of the em.ryo. Additionally, m.RNAs m.y be involved, particularly in the uterus, in the regulation of em.ryo lipid m.tabolism. im.une system. and *** Our study su

关键词： Em.ryo-m.ternal interaction Epigenetic Exosom.s m.m.alian Preim.lantation Reproductive fluids

Im.act of increasing one-carbon m.tabolites on traum.tic brain injury outcom. using pre-clinical m.dels

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Neural Regeneration Research 2024年第8期19卷 1728-1733页

作者： Sanika m.Joshi Theresa Currier Thom.s Nafisa m.Jadavji College of Osteopathic m.dicine Midwestern UniversityGlendaleCAUSA Departm.nt of Biom.dical Sciences Midwestern UniversityGlendaleCAUSA Departm.nt of Child Health College of Medicine–PhoenixUniversity of ArizonaPhoenixAZUSA College of Veterinary m.dicine Midwestern UniversityGlendaleCAUSA Departm.nt of Neuroscience Carleton UniversityOttawaCanada

Traum.tic brain injury is a m.jor cause of death and disability worldwide,affecting over 69 m.llion individuals ***-carbon m.tabolism.has been shown to have beneficial effects after brain dam.ge,such as ischem.c ***,whether increasing one-carbon m.tabolite vitam.ns im.acts traum.tic brain injury outcom.s in patients requires m.re *** aim.of this review is to evaluate how one-carbon m.tabolites im.act outcom.s after the onset of traum.tic brain ***,Web of Science,and Google Scholar databases were searched for studies that exam.ned the im.act of B-vitam.n supplem.ntation on traum.tic brain injury *** search term. included com.inations of the following words:traum.tic brain injury,dietary supplem.ntation,one-carbon m.tabolism.and *** focus of each literature search was basic science *** year of publication in the literature searches was not *** analysis of the literature has shown that dietary supplem.ntation of B-vitam.ns has significantly im.roved the functional and behavioral recove ry of anim.ls with traum.tic brain injury com.ared to *** r,this im.rovem.nt is dosage-dependent and is contingent upon the onset of supplem.ntation and whether there is a sustained or continuous delive ry of vitam.n supplem.ntation post-traum.tic brain *** details of supplem.ntation post-traum.tic brain injury need to be further ***,we conclude that B-vitam.n supplem.ntation im.roves behavioral outcom.s and reduces cognitive im.airm.nt post-traum.tic brain injury in anim.l m.del *** investigation in a clinical setting should be stro ngly considered in co njunction with current m.dical treatm.nts for traum.tic brain injury-affected individuals.

关键词： folic acid nicotinam.de one-carbon m.tabolism riboflavin traum.tic brain injury vitam.n B12 vitam.n B2 vitam.n B3