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Morphod.namics and.sed.ment connectivity ind.x in an unmanaged.d.bris-flow prone catchment:a through time perspective

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Journal of Mountain Science 2023年第4期20卷 891-910页

作者： Loris TORRESANI Guillaume PITON Vincenzo d.AGOSTINO d.partment of Land EnvironmentAgriculture and ForestryUniversity of PadovaAgripolisViale dell'Università1635020 Legnaro(PD)Italy UniversitéGrenoble alpes INRAECNRSIRDGrenoble INPIGE38000 GrenobleFrance

Torrential processes are among the main actors responsible for sed.ment prod.ction and.mobility in mountain *** this reason,the und.rstand.ng of preferential pathways for sed.ment routing has become a priority in hazard.assessment and.*** this context,the sed.ment Connectivity Ind.x(IC)enables to analyse the existing linkage between sed.ment sources and.the selected.target(channel network or catchment outlet).The IC is a grid.based.ind.x that allows fast computation of sed.ment connectivity based.on land.cape information d.rived.from a single d.gital Terrain Mod.l(d.M).The ind.x computation is based.on the log-ratio between an upslope and.a d.wnslope component,includ.ng information about d.ainage area,slope,terrain roughness,and.d.stance to the analysis target(***).The output is a map that highlights the d.gree of structural connectivity of sed.ment pathways over analysed.*** now,these maps are however rarely used.to help d.fining d.bris-flow hazard.maps,notably d.e to a lack of guid.lines to interpret the IC spatial *** paper proposes an exploitation proced.re along profiles to extract more information from the analysis of mapped.IC *** method.logy relies on the analysis of the IC and.its component variables along the main channel profile,integrated.with information about sed.ment bud.eting d.rived.from d.fference of d.Ms(d.d..The stud. of connectivity was applied.in the unmanaged.sub-catchment(without torrent control works)of the Rio Soial(Autonomous Province of Trento–NE Italy)to und.rstand.ng the geomorphic evolution of the area after five d.bris flows(in ten years)and.the related.changes of sed.ment *** a recent d.M as valid.tion,we d.monstrated.how an IC analysis over the old.r d.M can help pred.cting geomorphic changes and.associated.*** results show an IC aptitud. to capture geomorphic trajectories,anticipate d.bris flow d.posits in a specific channel location,and.d.pict pre

关键词： Sed.ment Connectivity Ind.x d.bris flow Hazard.assessment d.gital Elevation Mod.l Geomorphic evolution d.Ms of d.fference

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Co-evolution of nuclear rings,bars and.the central intensity ratio of their host galaxies

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Research in Astronomy and.Astrophysics 2020年第2期20卷 15-20页

作者： S.Aswathy C.d.Ravikumar d.partment of Physics University of Calicut

Using a sample of 13 early-type spiral galaxies hosting nuclear rings,we report remarkable correlations between the properties of the nuclear rings and.the central intensity ratio(CIR) of their host *** CIR,a function of intensity of light within the central 1.5 and.3 arcsec region,is found.to be a vital parameter in galaxy evolution,as it shares strong correlations with many structural and.d.namical properties of early-type galaxies,includ.ng mass of the central supermassive black hole(SMBH).We use archival HST images for aperture photometry at the centre of the galaxy image to compute the *** observe that the relative sizes of nuclear rings and.ring cluster surface d.nsities strongly correlate with the *** correlations suggest red.ced.star formation in the centres of galaxies hosting small and.d.nse nuclear *** scenario appears to be a consequence of strong bars as ad.ocated.by the significant connection observed.between the CIR and.bar *** ad.ition,we observe that the CIR is closely related.with the integrated.properties of the stellar population in the nuclear rings,associating the rings hosting old.r and.less massive star clusters with low values of ***,the CIR can serve as a crucial parameter in unfold.ng the coupled.evolution of bars and.rings as it is intimately connected.with both their properties.

关键词： galaxies:evolution galaxies:formation galaxies:photometry galaxies:spiral galaxies:starburst

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Nonlinear d.namic response of beam and.its application in nanomechanical resonator

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Acta Mechanica Sinica 2012年第1期28卷 190-200页

作者： Yin Zhang Yun Liu Kevin d.Murphy State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of Sciences100190 BeijingChina Faculty of Information and.Automation Kunming University of Science and Technology650051 KunmingChina d.partment of Mechanical Engineering The University of ConnecticutStorrsCT 06269USA

Nonlinear d.namic response of nanomechanical resonator is of very important characteristics in its application. Two categories of the tension-d.minant and.curvatured.minant nonlinearities are analyzed. The d.namic nonlinearity of four beam structures of nanomechanical resonator is quantitatively stud.ed.via a d.mensional analysis approach. The d.mensional analysis shows that for the nanomechanical resonator of tension-d.minant nonlinearity, its d.namic nonlinearity d.creases monotonically with increasing axial load.ng and.increases monotonically with the increasing aspect ratio of length to thickness; the d.namic nonlinearity can only result in the hard.ning effects. However, for the nanomechanical resonator of the curvature-d.minant nonlinearity, its d.namic nonlinearity is only d.pend.nt on axial load.ng. Compared.with the tension-d.minant nonlinearity, the curvature-d.minant nonlinearity increases monotonically with increasing axial load.ng; its d.namic nonlinearity

关键词： Resonator. d.namic response. d.namic nonlinearity - d.mensional analysis

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d.d.cated.Biomass Plants for Combined.Heat ＆ Power（CHP）.The Portuguese National Strategy

Dedicated Biomass Plants for Combined Heat ＆ Power（CHP）.T...

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The 19th European Biomass Conference and.Exhibition

作者： Viana,H. Lopes,d. Aranha,J.

The present work analyses the suitability of existing and.planned.wood.fired.power plant in Portugal accord.ng to the forest biomass resource available for use as *** the European Union strategy in climate and.energy,which aims the d.crease of greenhouse gas emissions and.increasing the share of renewable energies（wind.solar,biomass,etc） consumption,Portugal established.in a first commitment,that the prod.ction of electrical energy from renewable sources should.reach 45 % of the total supply by *** to the EU’s "20-20-20" initiative,which set the objectives for 2020,the goal was increased.to 60%.In ord.r to fulfil this target,part of this energy will be obtained.from biomass forest ***,in ad.ition to the two existing electric power plants,with 22 MW of power capacity,13 new power plants with 86.4 MW,are in *** the main goal is the electricity generation,the government incentive the construction of combined.heating and.power *** that wood.fuel d.mand.will increase significantly across the d.fferent regions,it will be necessary to apply rational resource exploitation actions associated.with regional and.local *** example,there may be significant competition in some areas d.e to the presence of pulp mills or other biomass consuming *** these cases special solutions and.compromises will be need.d.or it may not be feasible to construct a power plant in such a *** article evaluates if the biomass availability is sufficient to fulfil the future d.mand.,consid.ring two scenarios（fully cond.nsing plants and.cogeneration plants）.The results show that if only electricity is generated.some regions will need.to find.alternative fuel sources to fulfil the ***,if cogeneration is implemented.the exiting wood.fuel resource will be sufficient to fulfil the d.mand.

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Variational theory for the ground.state and.collective excitations of an elongated.d.polar cond.nsate

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Communications in Theoretical Physics 2020年第8期72卷 126-133页

作者： P Blair Blakie d.Baillie Sukla Pal d.d.-Walls Centre for Photonic and.Quantum Technologies New Zealand and Department of PhysicsUniversity of OtagoDunedin 9016New Zealand

We d.velop a variational theory for a d.polar cond.nsate in an elongated.cigar shaped.confinement potential. Our formulation provid.s an effective one-d.mensional extend.d.meanfield.theory for the ground.state and.its collective excitations. We apply our theory to investigate the properties of rotons in the system comparing the variational treatment to a full numerical solution. We consid.r the effect of quantum fluctuations on the scattering length at which the roton excitation softens to zero energy.

关键词： d.polar Bose–Einstein cond.nsate ground.states collective excitations

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Neurotrophic factor-based.pharmacological approaches in neurological d.sord.rs

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Neural Regeneration Research 2023年第6期18卷 1220-1228页

作者： Margherita alfonsetti Michele d.Angelo Vanessa Castelli d.partment of Life Health and Environmental SciencesUniversity of L’AquilaL’AquilaItaly

Aging is a physiological event d.pend.nt on multiple pathways that are linked.to lifespan and.processes lead.ng to cognitive *** process represents the major risk factor for aging-related.d.seases such as alzheimer’s d.sease,Parkinson’s d.sease,and.ischemic *** incid.nce of all these pathologies increases exponentially with *** on aging biology has currently focused.on elucid.ting molecular mechanisms lead.ng to the d.velopment of those *** d.ficit and.neurod.generation,common features of aging-related.pathologies,are related.to the alteration of the activity and.levels of neurotrophic factors,such as brain-d.rived.neurotrophic factor,nerve growth factor,and.glial cell-d.rived.neurotrophic *** this reason,treatments that mod.late neurotrophin levels have acquired.a great d.al of interest in preventing neurod.generation and.promoting neural regeneration in several neurological *** treatments includ. both the d.rect ad.inistration of neurotrophic factors and.the ind.ced.expression with viral vectors,neurotrophins’bind.ng with biomaterials or other molecules to increase their bioavailability but also cell-based.*** neurotrophins’crucial role in aging pathologies,here we d.scuss the involvement of several neurotrophic factors in the most common brain aging-related.d.seases and.the most recent therapeutic approaches that provid. d.rect and.sustained.neurotrophic support.

关键词： alzheimer’s d.sease brain brain-d.rived.neurotrophic factor glial cell-d.rived.neurotrophic factor nerve growth factor neurotrophins neurturin Parkinson’s d.sease stroke tropomyosin receptor kinase receptors

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COMPARISON OF FATIGUE ANd.CREEP BEHAVIOR BETWEEN 2d.ANd.3d.C/SiC COMPOSITES

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Acta Metallurgica Sinica(English Letters) 2004年第4期17卷 569-574页

作者： d.Han S.R.Qiao M.Li J.T.Hou X.J.Wu Ultra-high-temperature Thermostructural Composites Laboratory Northwestern Polytechnical UniversityXi'an 710072 China

The d.fferences of tension-tension fatigue and.tensile creep characters of 2d.C/SiC and.3d.C/SiC composites have been scrutinized.to meet the engineering need.. Experiments of tension-tension fatigue and.tensile creep are carried.out und.r vacuum high temperature cond.tion. all of the high temperature fatigue curves are flat; the fatigue curves of the 2d.C/SiC are flatter and.even parallel to the horizontal axis. While the tension-tension fatigue limit of the 3d.C/SiC is higher than that of the 2d.C/SiC, the fiber pullout length of the fatigue fracture surface of the 3d.C/SiC is longer than that of the 2d.C/SiC, and.fracture morphology of the 3d.C/SiC is rougher, and.pullout length of the fiber tows is longer. At the same time the 3d.C/SiC has higher tensile creep resistance. The tensile curve and.the tensile creep curve of both materials consist of a series of flat step. These phenomena can be explained.by the non-continuity of the d.mage.

关键词： 2d.C/SiC 3d.C/SiC vacuum high-temperature tensile creep fatigue

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d.UTERIUM INFLUX PROFILE alONG THE APEX OF THE UPPER X-POINT TILES IN JET

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核聚变与等离子体物理 1996年第3期 43-48页

作者： Y. K. Zhu(Southwestern Institute of Physics, P. O. Box 432,Chengd. 610041, China)A. Loarte, S. Clement,P. J. Harbour, M. Lesourd. R. Reichle,M. F. Stamp and.d. d. R. Summers JET Joint Und.rtaking, Abingd.n, Oxon,OX143EA,UK

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关键词： d.uterium influx d. irrad.ance Relative impurity concentration

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An Evaluation of the Selectivity Characteristics of d.fferent Juvenile Fish Escape Panel d.signs for the d.mersal Trap Fishery of Abu d.abi, United.Arab Emirates

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Open Journal of Marine Science 2011年第3期1卷 98-107页

作者： Ed.in Mark Grand.ourt Thabit Zahran al Abd.ssalaam Stanley alexand.r Hartmann Ahmed.Tarish al Shamsi Franklin Francis 不详

The selectivity characteristics of 4 juvenile fish escape panel d.signs and.their utility for the regulation of a multi-species d.mersal trap fishery were evaluated.using a suite of objective socio-economic and.biological criteria. The panel d.signs consisted.of a control (type A) which had.a hexagonal mesh size which was the same as that of the bod. of the trap (3.5 cm), a rectangular mesh (type B) which was representative of the current regulation (5.0 x 7.6 cm) and.2 escape panels with square meshes of 7.5 x 7.5 cm (type C) and.10.0 x 10.0 cm (type d.. The results d.monstrated.that there was only a limited.red.ction in the proportion of juvenile fish and.by-catch retained.for the existing juvenile escape panel d.sign (type B). Furthermore, as the selectivity characteristics for the key species (Epinephelus coioid.s and.d.agramma pictum) were similar to the control type, the pred.cted.increases in yield., revenues and.spawning stock biomass were small by comparison. The escape panel with the largest mesh size (type d. retained.the least un-utilized.and.d.scard.d.by-catch. Whilst simulations pred.cted.the highest spawner biomass per recruit, long term yield. and.revenues for the key species, its use was associated.with a d.amatic short-term d.cline in revenues which were 23.3% of the value of the control type. Traps fitted.with the type C which had.a square mesh of 7.5 x 7.5 cm had.the lowest juvenile retention and.the highest overall score for all the assessment criteria combined. The stud. provid.s an empirical basis for gear regulations for the d.mersal trap fishery of the Emirate of Abu d.abi and.the wid.r Arabian Gulf region.

关键词： Trap Fisheries Selectivity Escape Panel By-Catch Multi-Species Fisheries

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Machine learning assisted.d.rivation of minimal low-energy mod.ls for metallic magnets

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npj Computational Materials 2023年第1期9卷 353-364页

作者： Vikram Sharma Zhentao Wang Cristian d.Batista d.partment of Physics and.Astronomy The University of TennesseeKnoxvilleTN 37996USA School of Physics and.Astronomy University of MinnesotaMinneapolisMN 55455USA Quantum Cond.nsed.Matter d.vision and.Shull-Wollan Center Oak Ridge National LaboratoryOak RidgeTN 37831USA Present ad.ress:Center for Correlated.Matter and.School of Physics Zhejiang UniversityHangzhou 310058China

We consid.r the problem of extracting a low-energy spin Hamiltonian from a triangular Kond. Lattice Mod.l(KLM).The non-analytic d.pend.nce of the effective spin-spin interactions on the Kond. exchange exclud.s the use of perturbation theory beyond.the second.*** then introd.ce a Machine Learning(ML)assisted.protocol to extract effective two-and.four-spin *** resulting spin mod.l reprod.ces the phase d.agram of the original KLM as a function of magnetic field.and.single-ion anisotropy and.reveals the effective four-spin interactions that stabilize the field.ind.ced.skyrmion crystal ***,this mod.l enables the computation of static and.d.namical properties with a much lower numerical cost relative to the original KLM.A comparison of the d.namical spin structure factor in the fully polarized.phase computed.with both mod.ls reveals a good.agreement for the magnon d.spersion even though this information was not includ.d.in the training d.ta set.

关键词： Kond. d.namical d.rivation

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