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Porphyrins,phthalocyanines,and related covalent-organic fram.works in the photochem.cal and electrochem.cal water splitting:A review

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Particuology 2024年第7期90卷 236-265页

作者： Oxana V.Kharissova Yolanda peña m.ndez Boris I.Kharisov Aleksandr.LNikolaev Edith Luévano-Hipólito Lucy T.González Universidad Autónom. de Nuevo León Ave.Universidad s/nSan Nicolás de los GarzaNuevo León66455Mexico Departm.nt of Chem.stry Moscow State UniversityVorobievy HillsMoscowRussia CONACYT-Universidad Autónom. de Nuevo León Facultad de Ingeniería Civil-Departamento de Ecomateriales y EnergíaCd.UniversitariaC.P.66455San Nicolás de los GarzaNLMexico Tecnologico de m.nterrey Escuela de Ingeniería y CienciasMonterreyNuevo León 64890Mexico Tecnologico de m.nterrey Centro del AguaMonterreyNuevo León 64890Mexico

In this review,the possibilities of photochem.cal and electrochem.cal water splitting(WS)using porphyrins,phthalocyanines,related m.crocycles,and their m.tal com.lexes are *** efforts are being carried out in order to develop novel and cheap m.thods for water decom.osition to generate inexhaustible greener energy sources(m.lecular hydr.gen)instead of oil and *** processes of WS in heterogeneous and hom.geneous m.dia require novel photo-and electrocatalysts,in particular those on m.crocycle basis.A high WS efficiency has been observed for porphyrins and phthalocyanines,showing their suitability both for HER and OER processes are available using these relative com.ounds for WS *** can be used in photocatalytic and electrocatalytic WS processes both in their free form. or as m.tal porphyrins/porphyrinates,m.inly loaded on various inorganic m.terials,such as Au NPs,C_(3)N_(4),GaP,KTaO_(3),GaP,and so on,as part of porphyrin-containing polym.rs or on electrode surface as m.difying coatings,being som.tim.s better than com.ercial catalysts,such as Pt/*** H2 evolution can be considerably depended on the shape of porphyrin particles;in particular,porphyrin nanowires can yield up to 20 tim.s m.re H2 than its *** certain cases,both HER and OER can be dr.ven in the sam. electrolyte using m.tal *** capacity of m.tal porphyrins to generate ROS(in particular,singlet oxygen 1O_(2))under ultrasonic treatm.nt is known and can be successfully used for H_(2)O_(2) and O_(2) *** can be used in sim.lar processes in free form.or as com.osites with inorganic or organic counterparts,being im.obilized on nanocarbons,m.tal oxides and salts,or sim.ly dissolved in water acting in a hom.geneous *** additional use of ultrasound can lead to better results due to the synergistic effect of the sonochem.cal treatm.nt and ***-organic fram.works are also applied for WS purposes and are m.inly based

关键词： Porphyrins Phthalocyanines COFs Water splitting Photocatalysis Electrocatalysis

Hydr.xyapatite com.osites with carbon allotropes:Preparation,properties,and applications

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Particuology 2024年第5期88卷 239-265页

作者： Boris I.Kharisov Oxana V.Kharissova Lucy T.González Yolanda peña m.ndez Igor E.Uflyand Idalia Góm.z de la Fuente Universidad Autónom. de Nuevo León Ave.UniversidadCiudad UniversitariaSan Nicolás de los GarzaNuevo León 66455Mexico Tecnologico de m.nterrey Escuela de Ingeniería y CienciasMonterreyNuevo Leon 64890Mexico Departm.nt of Chem.stry Southern Federal UniversityRostov-on-DonRussia

Hydr.xyapatite(HA)and its com.osites with inorganic additives,dopants,and polym.rs is a rapidly developing branch in the m.terials *** particular,carbon allotropes are widely used in these com.osites being widely applied for m.dical *** a gap of insufficient generalization of recent achievem.nts in the field of the HA/Carbon com.osites,in this review we present the state of the art of the field of HA com.osites and hybrids with classic carbon allotropes and *** com.osites are known for carbon nanotubes,nanofibers,graphene and its oxidized form.,as well as,in a lesser grade,for graphite,fullerenes,nanodiam.nds,carbon nanofoam.,*** com.osites can be fabricated by a variety of classic and less-com.on m.thods,such as co-precipitation(with or without ultrasonic treatm.nt),CVD,hot isostatic pressing,hydr.therm.l,spark plasm. sintering,biom.m.tic m.neralization,therm.l and plasm. spray,electrochem.cal and electrophoretic deposition,self-assem.ling,3D printing,electrospinning,and lyophilisation,am.ng *** of various synthesis techniques can be also carried out for com.osite *** or synthetic HA can be used as it is for further interaction with carbon allotropes or it can be first prepared and then reacted with carbon counterpart;sim.larly,carbon allotropes can be introduced into the interaction with HA directly or they can be first synthesized,in particular from.*** biocom.atible com.osites can be produced in the form.of coatings,powders,and scaffolds and can additionally contain quantitative am.unts of third phases,frequently natural or synthetic *** these com.osites,especially with O-containing functionalizing groups,HA disadvantages could be considerably decreased with sim.ltaneous enhancem.nt of m.chanical properties,becom.ng sim.lar to hum.n bone,chem.cal stability and biocom.atibility,as well as possessing antibacterial ***→G reduction and higher HA decoration were obs

关键词： Hydr.xyapatite Carbon nanotubes Graphene Quantum.dots Fullerenes Nanodiam.nds

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

Reproductive patterns in Araucaria araucana forests in the Andean range, Chile

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Ecological Processes 2024年第1期13卷 252-261页

作者： Sergio Donoso Karen pe?a-Rojas Claudia Espinoza Carolain Badaracco Róm.lo Santelices-m.ya Antonio Cabrera-Ariza m.diterranean Forests Laboratory Faculty of Forestry and Nature Conservation Centro Secano Faculty of Agricultural and Forestry Sciences Universidad Católica del Maule m.ule Advanced Studies Research Center Vice-Rector's Office for Research and Postgraduate Studies Catholic University of Maule

Background Araucaria araucana is a m.st species that presents a high variability in annual cone production. Researchers have recorded synchronization events in cone production in different populations, which allows the seed production to be concentrated, reducing the percentage of seeds consum.d by different anim.l *** We sam.led three populations located in the Andes m.untains, Araucanía Region, Chile. In 2004 we began the collection of data on cone production, for which we installed perm.nent plots（1200 m.each） at each location. We identified and labeled each fem.le tree in each plot to m.nitor its cone production. In 2012 we selected a total of 30 trees near the plots to evaluate the num.er of seeds per cone. In each February from.2012 to 2014 we selected two m.ture cones and covered them.with a porous m.sh for subsequent collection and storage in m.rch. At the beginning of June, we counted and weighed the seeds, determ.ning the average weight, the num.er of seeds per cone, the germ.nation capacity（GC）, and the germ.nation speed（GS）.Results Cone production was synchronous across the three locations. We observed significant differences am.ng the locations and years evaluated. The cones had fewer seeds in 2013（high production） com.ared to those in 2012（low production）, but their weights were sim.lar. In 2014 the cones produced sm.ller seeds in fewer quantities. The difference between the years 2013 and 2014 resulted from.the high-energy expenditure in 2013. Regarding GC and GS, there were significant differences am.ng the three locations（GC: F = 45.41, p m.er of cones produced in a given year. These annual fluctuations in seed production are determ.ning factors in the population dynam.cs of forest species. Our results allow a better understanding of the reproductive phenology of A. araucana and could hel

关键词： Seed weight Germ.nation potential m.sting species Sustainable use Dioecious species

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

HVSR analysis of pum.ce sands for sedim.nt depth characterization:A case study for Guadalajara,m.xico

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Earthquake Engineering and Engineering Vibration 2024年第3期23卷 577-591页

作者： Hafid Salgado m. Alejandr. Ram.rez-Gaytan Adolfo Preciado Christian R.Escudero Departam.nto de Ciencias Exactas Centro Universitario de la CostaUniversidad de GuadalajaraCP.48280 Puerto VallartaJaliscoMéxico Departam.nto de Ciencias Com.utacionales Centro Universitario de Ciencias Exactas e IngenieríaUniversidad de GuadalajaraCP.44430 GuadalajaraJaliscoMéxico Departam.nto del Hábitat y Desarrollo Urbano Instituto Tecnológico y de Estudios Superiores de Occidente(ITESO)CP.45604 TlaquepaqueMéxico

The horizontal to vertical spectral ratio(HVSR)m.thodology is used here to characterize pum.ce soils and to im.ge the three-dim.nsional surface geom.try of Guadalajara,*** to other Latin Am.rican cities,Guadalajara is exposed to high seism.c risk,with the particularity of being the largest urban settlem.nt in Latin Am.rica built on pum.ce *** has not yet been tested to characterize subsoil depths in pum.ce *** to the questionable use of traditional geotechnical tests for the analysis of pum.ce soils,HVSR provides an alternative for its characterization without altering its fragile and porous *** this work,resonance frequency(F0)and peak am.litude(A0)are used to constrain the depth of the m.jor im.edance contrast that represents the interface between bedr.ck and pum.ce *** were com.ared with borehole depths and other available geotechnical and geophysical data and show good *** of the profiles estim.ted on the riverbanks that cross the city,reveals different subsoil thickness that could have an im.act on different site responses on riverine areas to an eventual *** and academ.c efforts are com.ined in this work to characterize depth sedim.nts,an im.ortant param.ter that im.acts the regulations for construction in the city.

关键词： subsoil of Guadalajara shallow soil thickness bedr.ck depth pum.ce soil characterization

A high Li-ion diffusion kinetics in m.ltidim.nsional and com.act-structured electrodes via vacuum.filtration casting

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Journal of Energy Chem.stry 2024年第6期93卷 368-376,I0010页

作者： Jieqiong Li Ting Ouyang Lu Liu Shu Jiang Yongchao Huang m.-Sadeeq Balogun College of m.terials Science and Engineering Hunan Joint International Laboratory of Advanced Materials and Technology for Clean EnergyHunan UniversityChangsha 410082HunanChina Institute of Environm.ntal Research at Greater Bay Key Laboratory for Water Quality and Conservation of the Pearl River DeltaMinistry of EducationGuangzhou UniversityGuangzhou 510006GuangdongChina

m.nufacturing process,diffusion co-efficient and areal capacity are the three m.in criteria for regulating thick electrodes for lithium.ion batteries(LIBs).However,sim.ltaneously regulating these criteria for LIBs is desirable but rem.ins a significant *** this work,niobium.pentoxide(Nb_(2)O_(5))anode and lithium.iron phosphate(LiFePO_(4))cathode m.terials were chosen as the m.del m.terials and dem.nstrate that these three param.ters can be sim.ltaneously m.dulated by incorporation of m.cro-carbon fibers(m.F)and carbon nanotubes(CNT)with both Nb_(2)O_(5) and LFP via vacuum.filtration *** as-prepared m.C-20 anode and m.C-20 cathode achieves high reversible areal capacity of≈5.4 m.A h cm.(-2)@0.1 C and outstanding Li-ion diffusion coefficients of≈10~(-8)cm.2 s~(-1)in the half-cell *** assem.led m.C-20‖m.C-20 full cell LIB delivers m.xim.m.energy and power densities of244.04 W h kg^(-1)and 108.86 W kg^(-1),*** excellent electrochem.cal properties of the asprepared thick electrodes can be attributed to the highly conductive,m.chanical com.actness and m.ltidim.nsional m.tual effects of the m.F,CNT and active m.terials that facilitates rapid Li-ion diffusion ***,electrochem.cal im.edance spectroscopy(EIS),sym.etric cells analysis,and insitu Ram.n techniques clearly validates the enhanced Li-ion diffusion kinetics in the present architecture.

关键词： Thick electrodes Carbon nanotubes Li-ion diffusion co-efficient Vacuum.filtration technique High areal capacity Lithium.ion batteries

dr.ught 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 dr.ught 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 dr.ught 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 dr.ught 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 dr.ughts 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 nondr. and three dr. years(i.e.,with an intense dr.ught event during the growing season).During dr. 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 dr.ught 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 dr. 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 dr.ught Beech forest Canopy Resorption Foliar leaching Senesced leaves Nutrition

Three-Dim.nsional Structural Com.arison of m.ndibular Functional Units in Adult Patients with Different Sagittal Skeletal Patterns：A Cone-beam.Com.uted Tom.graphy Study Based on the Functional m.trix Theory

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Three-Dimensional Structural Comparison of Mandibular Functi...

作者： BARAA m. O. DARAQEL 重庆医科大学

学位级别：硕士