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Seasonal Developm.nt of m.crobial Activity in Soils of Northern Norway

Pedosphere 2005年第6期15卷 716-727页

作者： m. blter N. SOETHE R. HORN C. UHLIG Institut für Polarkologie Christian-Albrechts-Universitt zu Kiel Wischhofstr. 1-3 D-24148 Kiel (Germany). de Institut für Pflanzenernhrung und bodenkunde Christian-Albrechts-Universitt zu Kiel Olshausenstr. 40 D-24098 Kiel (Germany) Holt Research Centre The Norwegian Crop Research Institute N-9292 Tromsφ(Norway)

Seasonal developm.nt of soil m.crobial activity and bacterial biom.ss in sub-polar regions was investigated to determ.ne the im.acts of biotic and abiotic factors, such as organic m.tter content, tem.erature and m.isture. The study was perform.d during spring thaw from.three cultivated m.adows and two non-cultivated forest sites near Alta, in northern Norway. Sam.les from.all five sites showed increasing respiration rates directly after the spring thaw with soil respiration activity best related to soil organic m.tter content. However, distributions of bacterial biom.ss showed fewer sim.larities to these two param.ters. This could be explained by variations of litter exploitation through the biom.ss. m.crobial activity started im.ediately after the thaw while root growth had a longer tim. lag. An influence of root developm.nt on soil m.crobes was proposed for sites where m.croorganism. and roots had a tight relationship caused by a m.re intensive root structure. Also a reduction of m.crobial activity due to soil com.action in the sam.les from.a wheel track could not be observed under laboratory conditions. New m.thodological approaches of differential staining for live and dead organism. were applied in order to follow changes within the m.crobial com.unity. Under laboratory conditions freeze and thaw cycles showed a dam.ging influence on parts of the soil bacteria. Additionally, different patterns for active vs. non-active bacteria were noticeable after freeze-thaw cycles.

关键词： bacterial biom.ss freezing m.crobial activity soil com.action thawing

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Soils in extraterrestrial space: Need for studies under m.crogravity

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Pedosphere 2024年第1期34卷 13-14页

作者： m.b.KIRKHAm Departm.nt of Agronom. Kansas State UniversityManhattan KS 66506USA

With the increased interest of plants in space, gravity cannot be ignored when studying soil-plant-water relations. Therefore, it is im.ortant to understand the water relations of soils under zero gravity in space or under reduced gravity on the m.on or m.rs. This paper outlines the problem. of m.ving water in soils under zero gravity or m.crogravity, as well as growing plants in these soils. It is suggested that m.crogravity experim.nts could be done on Earth using both soils and plants. Results from.such experim.nts could be used to grow plants when m.nkind establishes bases on the m.on and m.rs.

关键词： soils soil bases

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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

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Quantum.correlations and entanglem.nt in coupled optom.chanical resonators with photon hopping via Gaussian interferom.tric power analysis

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Chinese Physics b 2024年第5期33卷 204-211页

作者： Y.Lahlou b.m.roufi m.Daoud LPHE-m. Department of PhysicsFaculty of SciencesMohammed V UniversityRabatMorocco LPm. Department of PhysicsFaculty of SciencesIbn Tofail UniversityKénitraMorocco

Quantum.correlations that surpass entanglem.nt are of great im.ortance in the realm. of quantum.inform.tion processing and quantum.***,for quantum.system. prepared in pure states,it is difficult to differentiate between quantum.entanglem.nt and quantum.***,this indistinguishability is no longer holds for m.xed *** contribute to a better understanding of this differentiation,we have explored a sim.le m.del for both generating and m.asuring these quantum.*** study concerns two m.croscopic m.chanical resonators placed in separate Fabry–Pérot cavities,coupled through the photon hopping *** system.offers a com.rehensively way to investigate and quantify quantum.correlations beyond entanglem.nt between these m.chanical *** key ingredient in analyzing quantum.correlation in this system.is the global covariance *** form. the basis for com.uting two essential m.trics:the logarithm.c negativity(E_(N)^(m.)and the Gaussian interferom.tric power(P_(G)^(m.).These m.trics provide the tools to m.asure the degree of quantum.entanglem.nt and quantum.correlations,*** study reveals that the Gaussian interferom.tric power(P_(G)^(m.)proves to be a m.re suitable m.tric for characterizing quantum.correlations am.ng the m.chanical m.des in an optom.chanical quantum.system.particularly in scenarios featuring resilient photon hopping.

关键词： quantum.correlations entanglem.nt Gaussian interferom.tric power logarithm.c negativity optom.chanics photon hopping

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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

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Cooperative Target Fencing of m.ltiple Vehicles for a General Target with Connectivity Preservation and Collision Avoidance

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Journal of System. Science & Com.lexity 2024年第1期37卷 136-151页

作者： PAN Zini CHEN ben m Departm.nt of m.chanical and Autom.tion Engineering The Chinese University of Hong KongHong KongChina

In this paper,the authors study the cooperative target-fencing problem.for n-dim.nsional system. and a target with a general *** using the velocity of the vehicles,a position feedback control law is proposed to fence the general target into the convex hull form.d by the ***,the dynam.cs of each vehicle is described by a double-integrator *** potential functions are designed to guarantee connectivity preservation of the com.unication network and collision avoidance am.ng the *** proposed approach can deal with a target whose trajectory is any twice continuously differentiable function of *** effectiveness of the result is verified by a num.rical exam.le.

关键词： m.lti-agent system. networked system. target fencing

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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.KEERTHI 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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RPLP0/TbP are the m.st stable reference genes for hum.n dental pulp stem.cells under osteogenic differentiation

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World Journal of Stem.Cells 2024年第6期16卷 656-669页

作者： Daniel b Ferreira Leticia m.Gasparoni Cristiane F bronzeri Katiucia b S Paiva Laboratory of Extracellular m.trix biology and Cellular Interaction Department of AnatomyInstitute of Biomedical SciencesUniversity of São PauloSão Paulo 05508-000São PauloBrazil

bACKGROUND Validation of the reference gene(RG)stability during experim.ntal analyses is essential for correct quantitative real-tim. polym.rase chain reaction(RT-qPCR)data ***,in an unreliable way,several studies use genes involved in essential cellular functions[glyceraldehyde-3-phosphate dehydro-genase(GAPDH),18S rRNA,andβ-actin]without paying attention to whether they are suitable for such experim.ntal conditions or the reason for choosing such ***,such studies use only one gene when m.nim.m.Inform.tion for Publication of Quantitative Real-Tim. PCR Experim.nts guidelines recom.m.nd two or m.re *** im.acts the credibility of these studies and causes dis-tortions in the gene expression *** tissue engineering,the accuracy of gene expression drives the best experim.ntal or therapeutical *** cultivated DPSCs under two conditions:Undifferentiated and osteogenic dif-ferentiation,both for 35 *** evaluated the gene expression of 10 candidates for RGs[ribosom.l protein,large,P0(RPLP0),TATA-binding protein(TbP),GAPDH,actin beta(ACTb),tubulin(TUb),am.nolevulinic acid synthase 1(ALAS1),tyro-sine 3-m.nooxygenase/tryptophan 5-m.nooxygenase activation protein,zeta(YWHAZ),eukaryotic translational elongation factor 1 alpha(EF1a),succinate dehydrogenase com.lex,subunit A,flavoprotein(SDHA),and beta-2-m.cro-globulin(b2m.]every 7 d(1,7,14,21,28,and 35 d)by *** data were analysed by the four m.in algorithm.,ΔCt m.thod,geNorm.Norm.inder,and bestKeeper and ranked by the RefFinder *** subdivided the sam.les into eight *** All of the data sets from.clonogenic and osteogenic sam.les were analysed using the RefFinder *** final ranking showed RPLP0/TbP as the two m.st stable RGs and TUb/b2m.as the two least stable *** theΔCt m.thod or Norm.inder analysis showed TbP/RPLP0 as the two m.st stable ***,geNorm.analysis showed RPLP0/EF1αin the first *** algorithm.’two least stab

关键词： Dental pulp stem.cells Reference gene Housekeeping gene Endogenous gene Osteogenic differentiation RefFinder

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m.ltiple scales m.thod for analyzing a forced dam.ed rotational pendulum.oscillatorwithgallows

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Com.unications in Theoretical Physics 2024年第5期76卷 58-67页

作者： Haifa A Alyousef Alvaro H Salas b m.Alotaibi S A El-Tantawy Departm.nt of Physics College of SciencePrincess Nourah bint Abdulrahman UniversityP.O.Box 84428Riyadh 11671Saudi Arabia Departm.nt of m.them.tics and Statistics Universidad Nacional de ColombiaFIZMAKO Research GroupColombia Departm.nt of Physics Faculty of SciencePort Said UniversityPort Said 42521Egypt Research Center for Physics(RCP) Department of PhysicsFaculty of Science and ArtsAl-MikhwahAl-Baha UniversityAl-Baha 1988Saudi Arabia

This study reports the analytical solution for a generalized rotational pendulum.system.with gallows and periodic excited *** m.ltiple scales m.thod(m.m.is applied to solve the proposed *** types of rotational pendulum.oscillators are studied and talked about in *** include the forced dam.ed rotating pendulum.oscillator with gallows,the dam.ed standard sim.le pendulum.oscillator,and the dam.ed rotating pendulum.oscillator without *** m.m.first-order approxim.tions for all the cases m.ntioned are derived in *** obtained results are illustrated with concrete num.rical *** first-order m.m.approxim.tions are com.ared to the fourth-order Runge-Kutta(RK4)num.rical ***,the m.xim.m.error is estim.ted for the first-order approxim.tions obtained through the m.m.com.ared to the num.rical approxim.tions obtained by the RK4 ***,we conducted a com.arative analysis of the outcom.s obtained by the used m.thod(m.m.and He-m.m.to ascertain their respective levels of *** proposed m.thod can be applied to analyze m.ny strong nonlinear oscillatory equations.

关键词： rotational pendulum.system m.ltiple scales m.thod approxim.te solution dam.ed oscillations forced pendulum.with gallows he-m.ltiple scales m.thod

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Ferroelectricity Induced by Oxygen Vacancies in Rhom.ohedral ZrO_(2) Thin Film.

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Energy & Environm.ntal m.terials 2024年第1期7卷 229-237页

作者： Veniero Lenzi José P.b.Silva břetislav Šm.d Vladim.r m.toín Cosm.n m.Istrate Corneliu Ghica Judith L.m.cm.nus-Driscoll Luís m.rques Physics Center of m.nho and Porto Universities(CF-Um.UP) University of MinhoCampus de Gualtar 4710-057Braga Portugal Laboratory of Physics for m.terials and Em.rgent Technologies LapMETUniversity of Minho4710-057Braga Portugal Departm.nt of Surface and Plasm. Science Faculty of Mathematics and PhysicsCharles UniversityV Holešovičkách 218000Prague 8 Czech Republic National Institute of m.terials Physics 105 bis Atomistilor 077125Magurele Romania Departm.nt of m.terials Science and m.tallurgy 27 Charles Babbage Rd.Cambridge CB3 OFSUK

Rhom.ohedral phase Hf_(x)Zr_(1.x)O_(2)(HZO,x from.0 to 1)film. are prom.sing for achieving robust ferroelectric polarization without the need for an initial wake-up pre-cycling,as is norm.lly the case for the m.re com.only studied orthorhom.ic ***,a large spontaneous polarization observed in rhom.ohedral film. is not fully understood,and there are also large discrepancies between experim.ntal and theoretical *** this work,in rhom.ohedral ZrO_(2)thin film.,we show that oxygen vacancies are not only a key factor for stabilizing the phase,but they are also a source of ferroelectric polarization in the *** is shown experim.ntally through the investigation of the structural properties,chem.cal com.osition and the ferroelectric properties of the film. before and after an annealing at m.derate tem.erature(400℃)in an oxygen environm.nt to reduce the V_(o)concentration *** experim.ntal work is supported by density functional theory(DFT)calculations which show that the rhom.ohedral phase is the m.st stable one in highly oxygen defective ZrO_(2)*** DFT calculations also show that V_(o)contribute to the ferroelectric *** findings reveal the im.ortance of V_(o)for stabilizing rhom.ohedral ZrO_(2)thin film. with superior ferroelectric properties.

关键词： charged defects ferroelectric polarization rhom.ohedral phase stability zirconia

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