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Regular Global Attractors of Type Ⅲ Thermoelastic Extensible Beams

Chinese Annals of Mathematics,Series B 2010年第5期31卷 619-630页

作者： Michele COTI ZELATI vittorino pata Ramon QUINTANILLA Mathematics Department Indiana UniversityRawles Hall Dipartimento di Matematica "F. Brioschi" Politecnico di Milano Matemtica Aplicada 2 ETSEIAT-UPC Terrassa

For β∈ R,the authors consider the evolution system in the unknown variables u and ααttu+αxxxxu+αxxtα-(β+αxu L22)αxxu=f,αttα-αxxα-αxxtα-αxxtu=0 describing the dynamics of type III thermoelastic extensible beams,where the dissipation is entirely contributed by the second equation ruling the evolution of the thermal displacement α.Under natural boundary conditions,the existence of the global attractor of optimal regularity for the related dynamical system acting on the phase space of weak energy solutions is established.

关键词：弹性梁热弹性 Ⅲ型自然边界条件进化系统动态扩展 III 热位移

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Effect of Long-Term Soil Management on the Mutual Interaction Among Soil Organic Matter, Microbial Activity and Aggregate Stability in a Vineyard

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Pedosphere 2018年第2期28卷 288-298页

作者： Sergio A.BELMONTE Luisella CELI Ruby J.STAHEL Eleonora BONIFACIO vittorino NOVELLO Ermanno ZANINI Kerri L.STEENWERTH Department of Agricultural Forest and Food Sciences Turin University USDA-ARS Crops Pathology and Genetics Research Unit

Vineyard management practices to enhance soil conservation principally focus on increasing carbon(C)input,whereas mitigating impacts of disturbance through reduced tillage has been rarely considered.Furthermore,information is lacking on the effects of soil management practices adopted in the under-vine zone on soil conservation.In this work,we evaluated the long-term effects(22 years)of alley with a sown cover crop and no-tillage(S+NT),alley with a sown cover crop and tillage(S+T),and under-vine zone with no vegetation and tillage(UV)on soil organic matter(SOM),microbial activity,aggregate stability,and their mutual interactions in a California vineyard in USA.Vegetation biomass,microbial biomass and activity,organic C and nitrogen(N)pools,and SOM size fractionation and aggregate stability were analysed.Soil characteristics only partially reflected the differences in vegetation biomass input.Organic C and N pools and microbial biomass/activity in S+NT were higher than those in S+T,while the values in UV were intermediate between the other two treatments.Furthermore,S+NT also exhibited higher particulate organic matter C in soil.No differences were found in POM C between S+T and UV,but the POM fraction in S+T was characterized by fresher material.Aggregate stability was decreased in the order:S+NT>UV>S+T.Tillage,even if shallow and performed infrequently,had a negative effect on organic C and N pools and aggregate stability.Consequently,the combination of a sown cover crop and reduced tillage still limited SOM accumulation and reduced aggregate stability in the surface soil layer of vineyards,suggesting relatively lower resistance of soils to erosion compared to no-till systems.

关键词： loamy Ultisol microbial biomass permanent grass soil organic matter fractionation soil respiration tillage vegetationbiomass

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Small footprint optoelectrodes using ring resonators for passive light localization

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Microsystems & Nanoengineering 2021年第3期7卷 97-110页

作者： vittorino Lanziol Gregory Telian Alexander Koshelev Paolo Micheletti Gianni Presti Elisa D'Arpa Paolo De Martino Monica Lorenzon Peter Denes Melanie West Simone Sassolini Scott Dhuey Hillel Adesnik Stefano Cabrini The Molecular Foundry Lawrenee Berkeley National LaboratoryBerkeleyCA 94720USA Department of Applied Science and Technology Politecnico di TorinoTorino 10129Italy Adesnik Lab University of California BerkeleyBerkeleyCA 94720USA aBeam Technologies HaywardCA 94541USA Lawrence Berkeley National Laboratory (LBNL)BerkeleyCA 94720USA

The combination of electrophysiology and optogenetics enables the exploration of how the brain operates down to a single neuron and its network activity.Neural probes are in vivo invasive devices that integrate sensors and stimulation sites to record and manipulate neuronal activity with high spatiotemporal resolution.State-of-the-art probes are limited by tradeoffs involving their lateral dimension,number of sensors,and ability to access independent stimulation sites.Here,we realize a highly scalable probe that features three-dimensional integration of small-footprint arrays of sensors and nanophotonic circuits to scale the density of sensors per cross-section by one order of magnitude with respect to state-of-the-art devices.For the first time,we overcome the spatial limit of the nanophotonic circuit by coupling only one waveguide to numerous optical ring resonators as passive nanophotonic switches.With this strategy,we achieve accurate on-demand light localization while avoiding spatially demanding bundles of waveguides and demonstrate the feasibility with a proof-of-concept device and its scalability towards high-resolution and low-damage neural optoelectrodes.

关键词： passive waveguide light

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