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Excellent energy storage performance in Bi_(0.5)Na_(0.5)tiO_(3)-based lead-free high-entropy relaxor ferroelectrics via B-site modification

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journal of Advanced Ceramics 2024年第3期13卷 345-353页

作者： Kaihua yang gengguang Luo Li Ma Ruoxuan che Zhiyi che Qin Feng Zhenyong Cen Xiyong chen jiajun Zhou Nengneng Luo state Key Laboratory of Featured Metal Materials and Life-cycle safety for Composite structures School of ResourcesEnvironment and MaterialsGuangxi UniversityNanning 530004China school of Optical and Electronic Information Key Lab of Functional Materials for Electronic Information(B)of Ministry of EducationHuazhong University of Science and TechnologyWuhan 430074China

Next-generation advanced high/pulsed power capacitors urgently require dielectric materials with outstanding energy storage ***_(0.5)Na_(0.5)tiO_(3)-based lead-free materials exhibit high polarization,but the high remanent polarization and large polarization hysteresis limit their applications in dielectric ***,high-entropy perovskite relaxor ferroelectrics(Na_(0.2)Bi_(0.2)Ba_(0.2)sr_(0.2)Ca_(0.2))(ti1-x%Zrx%)O_(3)are designed by adding multiple ions in the A-site and replacing the B-site ti^(4+)with a certain amount of Zr^(4+).the newly designed system showed high relaxor feature and slim polarization-electric(p-E)***,improved relaxor feature and obviously delayed polarization saturation were found with the increasing of Zr^(4+).Of particular importance is that both high recoverable energy storage density of 6.6 j/cm^(3) and energy efficiency of 93.5%were achieved under 550 kV/cm for the ceramics of x=6,accompanying with excellent frequency stability,appreciable thermal stability,and prosperous discharge *** work not only provides potential dielectric materials for energy storage applications,but also offers an effective strategy to obtain dielectric ceramics with ultrahigh comprehensive energy storage performance to meet the demanding requirements of advanced energy storage applications.

关键词： energy storage density (Bi_(0.5)Na_(0.5))tiO_(3) high-entropy perovskite ceramics polarization saturation relaxor ferroelectrics(RFEs)

Construction of 2D/2D ti_(3)C_(2)t_(x)MXene/Cds heterojunction with photothermal effect for efficient photocatalytic hydrogen production

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journal of Materials science & technology 2024年第4期171卷 1-9页

作者： t.y.huang Z.yang s.y.yang Z.h.dai y.j.Liu j.h.Liao g.y.Zhong Z.j.Xie y.p.Fang s.s.Zhang Key Laboratory for Biobased Materials and Energy of Ministry of Education Guangdong Laboratory for Lingnan Modern AgricultureCollege of Materials and EnergySouth China Agricultural UniversityGuangzhou 510643China school of physics and Optoelectronics South China University of TechnologyGuangzhou 510640China school of chemical Engineering and Energy technology Guangdong Provincial Key Laboratory of Distributed Energy SystemsDongguan University of TechnologyDongguan 523808China

the insensitivity of semiconductors to visible and infrared light is a key constraint on the utilization of light energy in photocatalytic *** photocatalysts with full-spectrum absorption through surface engineering is an effective approach to fully harnessing light energy in semiconductor ***,a novel stable ti_(3)C_(2)t_(x)MXene/Cds heterojunction catalyst is obtained by in-situ epitaxial growth of two-dimensional(2D)Cds nanosheets on 2D MXene interface via a solvothermal *** exceptional light absorption properties of MXene confer outstanding full-spectrum driven photocat-alytic hydrogen evolution capability upon the heterogeneous *** unique 2D/2D structure effectively mitigated the recombination of photogenerated carriers,enhancing the photocatalytic performance of the ***,the composite catalyst exhibits a significantly higher surface temperature of 80.4℃under visible light irradiation at an intensity of 0.1 W/cm^(2),which is 1.84 times higher than that of *** irradiation of visible and near infrared light,the composite catalyst with photothermal ef-fect demonstrates a remarkable hydrogen evolution rate of 65.4 mmol g^(-1)h^(-1),which is 7.2 times higher than that of Cds *** study introduces a novel approach for constructing full-spectrum absorption catalysts and expands the application of the photothermal effect in photocatalytic hydrogen evolution research.

关键词： two-dimensional structure heterostructure photothermal effect photocatalyst hydrogen evolution

Optimization of chemistry and process parameters for control of intermetallic formation in Mg sludges

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journal of Magnesium and Alloys 2024年第4期12卷 1431-1448页

作者： y.Fu g.g.Wang A.hu y.Li K.B.thacker j.p.Weiler h.hu Department of Mechanical Automotive and Materials EngineeringUniversity of Windsor401 Sunset AveWindsorOntario N9B 3P4Canada global technology Centre Meridian Lightweight Technologies25 MacNab AveStrathroyOntario N7G 4H6Canada

Intermetallic formation in sludge during magnesium(Mg)melting,holding and high pressure die casting practices is a very important ***,very often it is overlooked by academia,original equipment manufacturers(OEM),metal ingot producers and even die *** aim of this study was to minimize the intermetallic formation in Mg sludge via the optimization of the chemistry and process *** Al8Mn5 intermetallic particles were identified by the microstructure analysis based on the Al and Mn *** design of experiment(DOE)technique,taguchi method,was employed to minimize the intermetallic formation in the sludge of Mg alloys with various chemical compositions of Al,Mn,Fe,and different process parameters,holding temperature and holding *** sludge yield(sy)and intermetallic size(Is)was selected as two *** optimum combination of the levels in terms of minimizing the intermetallic formation were 9 wt.%Al,0.15 wt.%Mn,0.001 wt.%(10 ppm)Fe,690℃ for the holding temperature and holding at 30 mins for the holding time,*** best combination for smallest intermetallic size were 9 wt.%Al,0.15 wt.%Mn,0.001 wt.%(10 ppm)Fe,630℃ for the holding temperature and holding at 60 mins for the holding time,*** groups of sludge factors,chemical sludge(CsF),physical sludge(psF)and Comprehensive sludge Factors(and CpsF)were established for prediction of sludge yields and intermetallic sizes in Al-containing Mg *** CpsF with five independent variables including both chemical elements and process parameters gave high accuracy in prediction,as the prediction of the psF with only the two processing parameters of the melt holding temperature and time showed a relatively large deviation from the experimental *** chemical sludge Factor was primarily designed for small ingot producers and die casters with a limited melting and holding capacity,of which process parameters could be fixed *** physical sludge Factor could be used f

关键词： Magnesium sludge Al-Mn intermetallic Optimization taguchi method sludge factor chemical composition process parameter

supposition of graphene stacks to estimate the contact resistance and conductivity of nanocomposites

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Applied Mathematics and Mechanics(English Edition) 2024年第4期45卷 663-676页

作者： y.ZARE M.t.MUNIR g.j.WENg K.y.RhEE Biomaterials and tissue Engineering Research group Department of Interdisciplinary TechnologiesBreast Cancer Research CenterMotamed Cancer InstituteTehran ***Iran College of Engineering and technology American University of the Middle EastEgaila 54200Kuwait Department of Mechanical and Aerospace Engineering Rutgers UniversityNew BrunswickNJ 08903U.S.A. Department of Mechanical Engineering(BK21 Four) College of EngineeringKyung Hee UniversityYongin 446701Republic of Korea

In this study,the effects of stacked nanosheets and the surrounding interphase zone on the resistance of the contact region between nanosheets and the tunneling conductivity of samples are evaluated with developed equations superior to those previously *** contact resistance and nanocomposite conductivity are modeled by several influencing factors,including stack properties,interphase depth,tunneling size,and contact *** developed model's accuracy is verified through numerous experimental *** further validate the models and establish correlations between parameters,the effects of all the variables on contact resistance and nanocomposite conductivity are ***,the contact resistance is primarily dependent on the polymer tunnel resistivity,contact area,and tunneling *** dimensions of the graphene nanosheets significantly influence the conductivity,which ranges from 0 s/m to90 s/*** increased number of nanosheets in stacks and a larger gap between them enhance the nanocomposite's ***,the thicker interphase and smaller tunneling size can lead to higher sample conductivity due to their optimistic effects on the percolation threshold and network efficacy.

关键词： graphene polymer composite stacked nanosheet tunneling conductivity contact resistance interphase

Metal–Organic gel Leading to Customized Magnetic‑Coupling Engineering in Carbon Aerogels for Excellent Radar stealth and thermal Insulation performances

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Nano-Micro Letters 2024年第3期16卷 36-52页

作者： Xin Li Ruizhe hu Zhiqiang Xiong Dan Wang Zhixia Zhang Chongbo Liu Xiaojun Zeng Dezhi chen Renchao che Xuliang Nie Key Laboratory of jiangxi province for persistent pollutants Control and Resources Recycle Nanchang Hangkong UniversityNanchang 330063People’s Republic of China school of Environmental and chemical Engineering Nanchang Hangkong UniversityNanchang 330063People’s Republic of China Laboratory of Advanced Materials Department of Materials Science and Collaborative Innovation Center of Chemistry for Energy Materials and Collaborative Innovation Center of Chemistry for Energy MaterialsFudan UniversityShanghai 200438People’s Republic of China school of Materials science and Engineering Jingdezhen Ceramic UniversityJingdezhen 333403People’s Republic of China College of chemistry and Materials Jiangxi Agricultural UniversityNanchang 330045People’s Republic of China

Metal–organic gel(MOg)derived composites are promising multi-functional materials due to their alterable composition,identifiable chemical homogeneity,tunable shape,and porous ***,stable metal–organic hydrogels are prepared by regulating the complexation effect,solution polarity and curing ***,collagen peptide is used to facilitate the fabrication of a porous aerogel with excellent physical properties as well as the homogeneous dispersion of magnetic particles during ***,two kinds of heterometallic magnetic coupling systems are obtained through the application of Kirkendall ***/nitrogen-doped carbon(NC)aerogel demonstrates an ultra-strong microwave absorption of−85 dB at an ultra-low loading of 5%.After reducing the time taken by atom shifting,a FeCo/Fe3O4/NC aerogel containing virus-shaped particles is obtained,which achieves an ultra-broad absorption of 7.44 ghz at an ultra-thin thickness of 1.59 mm due to the coupling effect offered by dual-soft-magnetic ***,both aerogels show excellent thermal insulation property,and their outstanding radar stealth performances in j-20 aircraft are confirmed by computer simulation *** formation mechanism of MOg is also discussed along with the thermal insulation and electromagnetic wave absorption mechanism of the aerogels,which will enable the development and application of novel and lightweight stealth coatings.

关键词： Metal-organic gels heterometallic magnetic coupling Radar stealth thermal insulation Computer simulation technology

A new approach to pedestal differentiation for soil loss estimation-a case study from a burnt area in north-central portugal

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journal of Forestry Research 2024年第3期35卷 45-54页

作者： Frank g.A.Verheijen Martinho A.s.Martins sergio A.prats jan j.Keizer Centre for Environmental and Marine studies(CEsAM) Department Environment and PlanningUniversity of Aveiro3810-193 AveiroPortugal Mediterranean Institute for Agriculture Environment and Development(MED-CHANGE)Institute for Advanced Studies and ResearchUniversity of EvoraPolo da MitraAp.947006-554 EvoraPortugal geoBiociencias Geotecnologias E Geoengenharias(GEOBIOTEC)Department Environment and PlanningUniversity of Aveiro3810-193 AveiroPortugal

soil pedestals have long been used as qualitative indicators of soil splash *** rangelands,plant-capped pedestals,generally grass tussocks,have also been used to quantitatively estimate soil loss since the first half of the twentieth *** agricultural lands,forests,and bad-lands,stone-capped pedestals have been used as qualitative and semi-quantitative indicators of active,'extreme'*** work has been reported on using capstone pedestal data for quantifying soil *** postulate that three distinct capstone pedestal types may be present in any given location and that a detailed analysis of a pedestal height histogram may be used to recognize their *** analysis can subsequently inform if soil loss can be reliably estimated and if so,which of the existing methods using pedestal height data will provide more accurate *** three proposed capstone pedestal types are:(1)neo-pedestals formed underneath surface stones exposed by(partial)removal of the soil surface cover;(2)endo-pedestals formed underneath stones that were buried in the soil but have been exposed by erosion;and(3)phoenix-pedestals formed underneath stones from collapsed *** the pedestal height histogram of any given location,a skew to smaller heights may indicate the existence of endo-and/or phoenix-pedestals,which may be revealed as a bi-(or tri)modal distribution when using a smaller bin *** concept was applied to a case study where soil loss had been monitored for control plots and mulched plots during a 5-year period following wildfire in a eucalypt *** measured pedestal heights and used methods to quantitatively assess soil loss from soil pedestal data in the available *** pedestal data at the end of the 5-year period under or overestimated soil loss in the control treatment,with results ranging from 60 to 115%of measured soil loss,depending on the *** is postulated that phoenix-and endo-pedestals may be a driving fact

关键词： soil pedestals Mulch Wildfire soil erosion Char

Innovative pathways allow safe discharge of mild acute pancreatitis from the emergency room

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World journal of gastroenterology 2024年第11期30卷 1475-1479页

作者： Darshan j Kothari sunil g sheth Division of gastroenterology Duke University Medical CenterDurhamNC 27710United States Division of gastroenterology&hepatology Beth Israel Deaconess Medical CenterHarvard Medical SchoolBostonMA 02215United States

Acute pancreatitis(Ap)is a leading cause of gastrointestinal-related hospitalizations in the United states,resulting in 300000 admissions per year with an estimated cost of over$2.6 billion *** severity of Ap is determined by the presence of pancreatic complications and end-organ *** moderate/severe pancreatitis can be associated with significant morbidity and mortality,the majority of patients have a mild presentation with an uncomplicated course and mortality rate of less than 2%.Despite favorable outcomes,the majority of mild Ap patients are admitted,contributing to healthcare cost and *** this Editorial we review the performance of an emergency department(ED)pathway for patients with mild Ap at a tertiary care center with the goal of reducing hospitalizations,resource utilization,and costs after several years of implementation of the *** discuss the clinical course and outcomes of mild Ap patients enrolled in the pathway who were successfully discharged from the ED compared to those who were admitted to the hospital,and identify predictors of successful ED discharge to select patients who can potentially be triaged to the *** conclude that by implementing innovative clinical pathways which are established and reproducible,selected Ap patients can be safely discharged from the ED,reducing hospitalizations and healthcare costs,without compromising clinical *** also identify a subset of patients most likely to succeed in this pathway.

关键词： Emergency department Mild pancreatitis pathways hospitalization predictors

semi-analytical investigation of heat transfer in a porous convective radiative moving longitudinal fin exposed to magnetic field in the presence of a shape-dependent trihybrid nanofluid

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Applied Mathematics and Mechanics(English Edition) 2024年第1期45卷 197-216页

作者： C.g.pAVIthRA B.j.gIREEshA M.L.KEERthI Department of pg studies and Research in Mathematics Kuvempu UniversityShankaraghatta 577451India Department of Mathematics and statistics M.S.Ramaiah University of Applied SciencesBengaluru 560058India

the thermal examination of a non-integer-ordered mobile fin with a magnetism 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 combination approach is utilized to evaluate the physical and thermal characteristics of the trihybrid and hybrid nanofluids, excluding the thermal conductivity and dynamic viscosity. these two properties are inferred by means of the interpolation method based on the volume fraction of nanoparticles. the governing equation is transformed into a dimensionless form, and the Adomian decomposition sumudu transform method(ADstM) is adopted to solve the conundrum of a moving fin immersed in a trihybrid nanofluid. the obtained results agree well with those numerical simulation results, indicating that this research is reliable. the influence of diverse factors on the thermal overview for varying noninteger values of γ is analyzed and presented in graphical representations. Furthermore, the fluctuations in the heat transfer concerning the pertinent parameters are studied. the results show that the heat flux in the presence of the combination of spherical, cylindrical, and platelet nanoparticles is higher than that in the presence of the combination of only spherical and cylindrical nanoparticles. the temperature at the fin tip increases by 0.705 759% when the value of the peclet number increases by 400%, while decreases by 11.825 13% when the value of the hartman number increases by 400%.

关键词： convection radiation moving longitudinal fin Adomian decomposition sumudu transform method(ADstM) trihybrid nanofluid magnetic field

the initial stages of Li_(2)O_(2) formation during oxygen reduction reaction in Li-O_(2) batteries:the significance of Li_(2)O_(2) in charge-transfer reactions within devices

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journal of Energy chemistry 2024年第1期88卷 223-231,I0006页

作者： Daniela M.josepetti Bianca p.sousa simone A.j.Rodrigues Renato g.Freitas gustavo Doubek Advanced Energy storage Division LABCenter for Innovation on New EnergiesSchool of Chemical EngineeringUniversity of CampinasAv Albert Einstein 50013083-852CampinasSPBrazil Institute of physics&Department of chemistry Laboratory of Computational MaterialsFederal University of Mato Grosso78060-900CuiabáMTBrazil

Lithium-oxygen batteries are a promising technology because they can greatly surpass the energy density of lithium-ion ***,this theoretical characteristic has not yet been converted into a real device with high *** with air contamination,metallic lithium reactivity,and complex discharge and charge reactions are the main issues for this technology.A fast and reversible oxygen reduction reaction(ORR)is crucial for good performance of secondary batteries',but the partial knowledge of its mechanisms,especially when devices are concerned,hinders further *** this perspective,the present work uses operando Raman experiments and electrochemical impedance spectroscopy(EIs)to assess the first stages of the discharge processes in porous carbon electrodes,following their changes cycle by cycle at initial operation.A growth kinetic formation of the discharge product signal(Li_(2)O_(2))was observed with operando Raman,indicating a first-order reaction and enabling an analysis by a microkinetic *** solution mechanism in the evaluated system was ascribed for an equivalent circuit with three time *** the time constant for the anode interface reveals to remain relatively constant after the first discharge,its surface seemed to be more *** model indicated that the reaction occurs at the Li_(2)O_(2) surface,decreasing the associated resistance during the initial discharge ***,the growth of Li_(2)O_(2) forms a hetero-phase between Li_(2)O_(2)/electrolyte,while creating a more compact and homogeneous on the Li_(2)O_(2)/cathode *** methodology here described thus offers a way of directly probing changes in surface chemistry evolution during cycling from a device through EIs analysis.

关键词： Li-O_(2)battery Operando Raman analysis Equivalent circuit modeling time-constant distribution