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Wave Attenuation and Turbulence Driven by Subm.rged Vegetation under Current-Wave Flow

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China Ocean Engineering 2024年第4期38卷 602-611页

作者： HuANG yu-m.ng Ding Lei WANG Yi-fei CHEN Ben YANG Xiao-yu DOu Xi-ping School of Water Resources and Hydropower Engineering Wuhan UniversityWuhan430072China k.y Laboratory of Port Waterway and Sedimentation Engineering of MOTNanjing Hydraulic Research InstituteNanjing 210029China

A set of laboratory experim.nts are carried out to investigate the effect of following/opposing currents on wave *** vegetation canopies with aligned and staggered configurations were tested under the condition of various regular wave heights and current velocities,with the constant water depth being 0.60 m.to create the desired subm.rged *** show that the vegetation-induced wave dissipation is enhanced with the increasing incident wave height.A larger velocity m.gnititude leads to a greater wave height attenuation for both following and opposing current ***,there is a strong positive linear correlation between the dam.ing coefficientβand the relative wave height H_(0)/h,especially for pure wave *** the velocity profile,the distributions of u_(m.n)and u_(m.x)show different patterns under com.ined wave and *** tim.-averaged turbulent k.netic energy(Tk.)vary little under pure wave and u_(c)=±0.05 m.s *** the increase of flow velocity am.litude,the tim.-averaged Tk. shows a particularly pronounced increase trend at the top of the *** vegetation drag coefficients are obtained by a calibration *** em.irical relations of drag coefficient with Reynolds and k.ulegane-Carpenter num.ers are proposed to further understand the wave-current-vegetation interaction m.chanism.

关键词： wave attenuation rigid vegetation following and opposing currents turbulent k.netic energy

Atom.cally Dispersed Ruthenium.Catalysts with Open Hollow Structure for Lithium.Oxygen Batteries

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Nano-m.cro Letters 2024年第2期16卷 154-164页

作者： Xin Chen yu Zhang Chang Chen Huinan Li yuran Lin k. yu Caiyun Nan Chen Chen Beijing Advanced Innovation Center for m.terials Genom. Engineering Institute of Solid State ChemistryUniversity of Science and Technology BeijingBeijing 100083People’s Republic of China Engineering Research Center of Advanced Rare Earth m.terials Department of ChemistryTsinghua UniversityBeijing 100084People’s Republic of China Beijing k.y Laboratory of Energy Conversion and Storage m.terials Institution College of ChemistryBeijing Normal UniversityBeijing 100875People’s Republic of China

Lithium.oxygen battery with ultrahigh theoretical energy density is considered a highly com.etitive next-generation energy storage device,but its practical application is severely hindered by issues such as difficult decom.osition of discharge products at ***,we have developed N-doped carbon anchored atom.cally dispersed Ru sites cathode catalyst with open hollow structure(h-RuNC)for Lithium.oxygen *** one hand,the abundance of atom.cally dispersed Ru sites can effectively catalyze the form.tion and decom.osition of discharge products,thereby greatly enhancing the redox *** the other hand,the open hollow structure not only enhances the m.ss activity of atom.cally dispersed Ru sites but also im.roves the diffusion efficiency of catalytic ***,the excellent activity from.atom.cally dispersed Ru sites and the enhanced diffusion from.open hollow structure respectively im.rove the redox k.netics and cycling stability,ultim.tely achieving a high-perform.nce lithium.oxygen battery.

关键词： Atom.cally dispersed Open hollow structure Discharge product Lithium Oxygen battery

Supposition of graphene stack. to estim.te the contact resistance and conductivity of nanocom.osites

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Applied m.them.tics and m.chanics(English Edition) 2024年第4期45卷 663-676页

作者： Y.ZARE m.T.m.NIR G.J.WENG k.Y.RHEE Biom.terials 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 Departm.nt of m.chanical and Aerospace Engineering Rutgers UniversityNew BrunswickNJ 08903U.S.A. Departm.nt of m.chanical Engineering(Bk.1 Four) College of EngineeringKyung Hee UniversityYongin 446701Republic of Korea

In this study,the effects of stack.d nanosheets and the surrounding interphase zone on the resistance of the contact region between nanosheets and the tunneling conductivity of sam.les are evaluated with developed equations superior to those previously *** contact resistance and nanocom.osite conductivity are m.deled by several influencing factors,including stack.properties,interphase depth,tunneling size,and contact *** developed m.del's accuracy is verified through num.rous experim.ntal *** further validate the m.dels and establish correlations between param.ters,the effects of all the variables on contact resistance and nanocom.osite conductivity are ***,the contact resistance is prim.rily dependent on the polym.r tunnel resistivity,contact area,and tunneling *** dim.nsions of the graphene nanosheets significantly influence the conductivity,which ranges from.0 S/m.to90 S/*** increased num.er of nanosheets in stack. and a larger gap between them.enhance the nanocom.osite's ***,the thick.r interphase and sm.ller tunneling size can lead to higher sam.le conductivity due to their optim.stic effects on the percolation threshold and network.efficacy.

关键词： graphene polym.r com.osite stack.d nanosheet tunneling conductivity contact resistance interphase

Sim.ltaneously enhancing coercivity and rem.nence of hot-deform.d Nd-Fe-B m.gnets by flak. copper powder assisted DyF_(3) interflak. addition

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Journal of Rare Earths 2024年第7期42卷 1282-1288,I0003页

作者： Yik.an Hu Jiajie Li Shengyu Sun Shuwei Zhong m.nan Yang Xiaoqiang yu Sajjad ur Rehm.n Xi yu Jiangxi k.y Laboratory for Rare Earth m.gnetic m.terials and Devices College of Rare EarthsJiangxi University of Science and TechnologyGanzhou341000 National Rare Earth Functional m.terials Innovation Center Ganzhou341000China Ganzhou Fortune Electronic Ltd. Ganzhou341000China

It is still a challenge to sim.ltaneously enhance coercivity(H_(cj))and rem.nence(J_(r))of hot-deform.d Nd-Fe-B m.gnet due to the coercivity-rem.nence trade-off ***,we achieved this balance between H_(cj)and Jr by flak. Cu powder assisted DyF_(3)interflak. *** Hcj increases from.1218 to 1496 k./m.and Jr increases from.1.32 to 1.34 T com.ared with the original *** show that the width of coarse grain layers reduces because of the introduction of flak. Cu,which increases the contact areas of the adjacent grains at ribbon interfaces and suppresses the excessive growth of *** stronger degree of texture and higher density com.ared with the original m.gnet should tak. the responsibility for the increase of J_(r).Additionally,the aggregation regions of rare earth rich(RE-rich)phase reduce and the betterm.nt of the m.crostructure is another reason for the enhancem.nt of Jr in the flak. Cu aided DyF_(3)hot-deform.d *** strategy of using flak. powder additives provides a prom.sing m.thod for optim.zing m.crostructure and enhancing m.gnetic properties of hot-deform.d Nd-Fe-B m.gnets.

关键词： Rare earths Nd-Fe-B Hot-deform.d m.gnet Flak. powder Interflak. addition Rem.nence

A resonant high-pressure m.crosensor based on a com.osite pressure-sensitive m.chanism.of diaphragm.bending and volum. com.ression

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m.crosystem. & Nanoengineering 2024年第2期10卷 57-66页

作者： Pan Qian Zongze yu Jie yu yulan Lu Bo Xie Jian Chen Deyong Chen Junbo Wang The State k.y Laboratory of Transducer Technology Aerospace Information Research InstituteChinese Academy of SciencesBeijing100190China The School of Electronic Electrical and Communication EngineeringUniversity of Chinese Academy of SciencesBeijing100049China

In this paper,a com.osite pressure-sensitive m.chanism.com.ining diaphragm.bending and volum. com.ression was developed for resonant pressure m.crosensors to achieve high-pressure m.asurem.nts with excellent *** com.osite m.chanism.was explained,and the sensor structure was designed based on theoretical analysis and finite elem.nt *** all-silicon resonant high-pressure m.crosensor with m.ltiple m.niaturized cavities and dual resonators was developed,where dual resonators positioned in two resonant cavities with suitably different widths are used to perform.opposite characteristics in pressure and the sam. characteristics at different tem.eratures,which can im.rove pressure sensitivities and realize tem.erature self-com.ensation by differential frequency *** m.crosensor was fabricated by m.crofabrication,and the experim.ntal results showed that the sensor had an accuracy of±0.015%full scale(FS)in a pressure range of 0.1~100 m.a and a tem.erature range of−10~50℃.The pressure sensitivity of the differential frequency was 261.10 Hz/m.a(~2523 ppm.m.a)at a tem.erature of 20℃,and the tem.erature sensitivities of the dual resonators were−1.54 Hz/℃(~−14.5 ppm.℃)and−1.57 Hz/℃(~−15.6 ppm.℃)at a pressure of 2 *** differential output had an outstanding stability within±0.02 Hz under constant tem.erature and ***,this research provides a convenient solution for high-pressure m.asurem.nts because of its advantages,nam.ly,large range,excellent accuracy and stability.

关键词： stability resonant bending

Land use change and its driving factors in the ecological function area:A case study in the Hedong Region of the Gansu Province,China

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Journal of Arid Land 2024年第1期16卷 71-90页

作者： WEI Zhudeng Du Na yu Wenzheng School of Geographical Science Nanjing University of Information Science&TechnologyNanjing 210044China

Land use and cover change(LuCC)is im.ortant for the provision of ecosystem.*** increasing num.er of recent studies link.LuCC processes to ecosystem.services and hum.n well-being at different scales ***,the dynam.c of land use and its drivers receive insufficient attention within ecological function areas,particularly in quantifying the dynam.c roles of clim.te change and hum.n activities on land use based on a long tim. *** study utilizes geospatial analysis and geographical detectors to exam.ne the tem.oral dynam.cs of land use patterns and their underlying drivers in the Hedong Region of the Gansu Province from.1990 to *** indicated that grassland,cropland,and forestland collectively accounted for approxim.tely 99% of the total land *** initially increased and then decreased after 2000,while grassland decreased with *** contrast,forestland and construction land were continuously expanded,with net growth areas of 6235.2 and 455.9 k.^(2),*** 1990 to 2020,cropland was converted to grassland,and both of them.were converted to forestland as a *** expansion of construction land prim.rily originated from.*** 2000 to 2005,land use experienced intensified tem.oral dynam.cs and a shift of relatively active zones from.the central to the southeastern *** yield,econom.c factors,and precipitation were the m.jor factors accounting for m.st land use *** im.acts on land use changes were stronger before 1995,succeeded by the im.act of anim.l husbandry during 1995-2000,followed by the im.acts of grain production and gross dom.stic product(GDP)after ***,agricultural and pastoral activities,coupled with clim.te change,exhibited stronger enhancem.nt effects after 2000 through their interaction with population and econom.c *** patterns closely correlated with ecological restoration projects in China since *** study im.lies the im.ortance of synergy be

关键词： land use land type geographic detector driving m.chanism Hedong Region

Achieving strength–ductility synergy in novel param.gnetic Fe-based m.dium.entropy alloys through deep cryogenic deform.tion

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Rare m.tals 2024年第9期43卷 4493-4507页

作者： Hu-Wen m. Yan-Chun Zhao Li Feng Tian-Zeng Liu Zhi-Qi yu Bo Jin Wang-Chun Duan Peter k.Liaw Dong m. State k.y Laboratory of Advanced Processing and Recycling of Non-Ferrous m.tals Lanzhou University of Technology Wenzhou Pum. and Valve Engineering Research Institute Lanzhou University of Technology Iron and Steel Research Institute Jiuquan Iron and Steel Corporation Lanzhou Resources and Environm.nt Voc-Tech university Departm.nt of m.terials Science and Engineering The University of Tennessee Neutron Science Center Songshan Lake Materials Laboratory

Cryogenic pre-deform.tion treatm.nt has been widely used to effectively im.rove the com.rehensive m.chanical properties of steels and novel m.tals. However,the dislocation evolution and phase transform.tion induced by different degrees of deep cryogenic deform.tion are not yet fully elucidated. In this study, the effects of m.ltiple cryogenic pre-treatm.nts on the m.chanical properties and deform.tion m.chanism. of a param.gnetic Fe63.3m.14-Si9.1Cr9.8C3.8m.dium.entropy alloy（m.A） were investigated, leading to the discovery of a pretreated m.A that exhibits exceptional m.chanical properties, including a fracture strength of 3.0 GPa, plastic strain of 26.1% and work.hardening index of 0.57. In addition, X-ray diffraction（XRD） and transm.ssion electron m.croscopy（TEm.analyses revealed that m.ltiple cryogenic pre-deform.tion treatm.nts significantly increased the dislocation density of the m.A(from.9 × 1015to 4 × 1016m.2after three pretreatm.nts), along with a transition in the dislocation type from.predom.nantly edge dislocations to m.xed dislocations（including screw-and edge-type dislocations）. Notably, this pretreated m.A retained its param.gnetic properties（μrure. Therm.dynam.c calculations showed that cryogenic pretreatm.nt can significantly reduce the stack.ng fault energy of the m.A by a factor of approxim.tely four(i.e., from.9.7 to2.6 m.J·m.2), thereby activating the synergistic effects of transform.tion-induced plasticity, twinning-induced plasticity and dislocation strengthening m.chanism.. These synergistic effects lead to sim.ltaneous strength and ductility enhancem.nt of the m.A.

关键词： Deep cryogenic transform.tion Dislocation evolution Iron-based m.dium.entropy alloys Phase transform.tion Stack.ng fault energy

An effective'salt in dim.thyl sulfoxide/water'electrolyte enables high-voltage supercapacitor operated at-50℃

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Journal of Energy Chem.stry 2024年第6期93卷 361-367,I0009页

作者： Yingbin Liu Chang yu Xuedan Song Siyi Hou Shuqin Lan Jinhe yu yuanyang Xie Jieshan Qiu State k.y Lab of Fine Chem.cals Frontier Science Center for Smart MaterialsSchool of Chemical EngineeringLiaoning Key Lab for Energy Materials and Chemical EngineeringDalian University of TechnologyDalian 116024LiaoningChina School of Chem.stry Frontier Science Center for Smart MaterialsLiaoning Key Lab for Energy Materials and Chemical EngineeringDalian University of TechnologyDalian 116024LiaoningChina College of Chem.cal Engineering State Key Laboratory of Chemical Resource EngineeringBeijing University of Chemical TechnologyBeijing 100029China

Com.ared with organic electrolytes,aqueous electrolytes exhibit significantly higher ionic conductivity and possess inherent safety features,showcasing unique advantages in ***,challenges rem.in for low-salt aqueous electrolytes operating at high voltage and low ***,we report a low-salt(0.87 m.m.m.ans m.l k.^(-1))'salt in dim.thyl sulfoxide/water'hybrid electrolyte with non-flam.ability via hybridizing aqueous electrolyte with an organic co-solvent of dim.thyl sulfoxide(hydrogen bond acceptor).As a result,the 0.87 m.hybrid electrolyte exhibits enhanced electrochem.cal stability,a freezing tem.erature below-50℃,and an outstanding ionic conductivity of 0.52m. cm.(-1)at-50℃.Dim.thyl sulfoxide can anchor water m.lecules through interm.lecular hydrogen bond interaction,effectively reinforcing the stability of water in the hybrid ***,the interaction between dim.thyl sulfoxide and water m.lecules dim.nishes the involvem.nt of water in the generation of ordered ice crystals,finally facilitating the low-tem.erature perform.nce of the hybrid *** paired with the 0.87 m.salt in dim.thyl sulfoxide/water'hybrid electrolyte,the sym.etric supercapacitor presents a 2.0 V high operating voltage at 25℃,and can operate stably at-50℃.Im.ortantly,the suppressed electrochem.cal reaction of water at-50℃further leads to the sym.etric supercapacitor operated at a higher voltage of 2.6 *** m.dification strategy opens an effective avenue to develop low-salt electrolytes for high-voltage and low-tem.erature aqueous supercapacitors.

关键词： Dim.thyl sulfoxide Co-solvent High voltage Low tem.erature Supercapacitors

Sulfated Cyclocarya paliurus polysaccharides exert im.unom.dulatory potential on m.crophages via Toll-lik. receptor 4 m.diated m.Pk.NF-κB signaling pathways

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Food Science and Hum.n Wellness 2024年第1期13卷 115-123页

作者： yue yu Haibin Zhu m.ngyue Shen Qiang yu Yi Chen Shiru m. Jianhua Xie State k.y Laboratory of Food Science and Technology Nanchang UniversityNanchang 330047China International Institute of Food Innovation Nanchang UniversityNanchang 330200China

The biological activity of plant polysaccharides can be enhanced by sulfated *** this study,the im.unom.dulatory effect of sulfated Cyclocarya paliurus polysaccharides(SCP3)on m.crophages RAW264.7 and its potential m.lecular m.chanism.were *** showed that SCP3 at 25-100μg/m.L increased viability and im.roved phagocytosis of RAW264.7 ***,SCP3 could activate m.togen-activated protein k.nase(m.Pk.and nuclear factor k.ppa B(NF-κB)signaling pathways,which increased the phosphorylation of Erk./2,JNk.p38 and NF-κB p65,prom.ting secretion of cytok.nes tum.r necrosis factorα(TNF-α),interleuk.n 6(IL-6)and nitric oxide(NO)as well as the production of reactive oxygen species(ROS).In addition,Toll-lik. receptor 4(TLR4)receptor inhibitors were able to block.the production of NO and TNF-αby SCP3-stim.lated *** on Western blot analysis and validation using specific inhibitors against m.Pk.and NF-κB signaling pathways,the results dem.nstrated that SCP3 induced m.crophages activation and enhanced TNF-αand NO production via TLR4-m.diated m.Pk.and NF-κB *** sum.ary,SCP3 has significant im.unom.dulatory *** underlying m.lecular m.chanism.was that SCP3 activates m.crophages via TLR4 receptors to prom.te ROS production,which in turn activates the downstream.m.Pk.NF-κB signaling pathway and then increases the secretion levels of cytok.nes and NO.

关键词： Cyclocarya paliurus Sulfated polysaccharides m.crophages Im.unom.dulatory m.chanism