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Modelling.evolution of bed profile and g.ain size distribution in unsurveyed rivers

International Journal of Sediment Research 2009年第2期24卷 127-144页

作者： P. RONCO g. fasolato g. DiSILVIO Department of Hydraulic Maritime Environmental and Geotechnical EngineeringUniversity of Padua Department of Hydraulic Maritime Environmental & Geotechnical EngineeringUniversity of Padua

The water flow and sediment transport equations have been linearized and analytically solved under the hypothesis of quasi-equilibrium conditions. This solution permits to reconstruct the river bathymetry from planimetric data,the only ones available from satellite imag.s for most of the larg. rivers of the world. The linearized quasi-equilibrium solution provides a criterion to evaluate the accuracy of the approximate(uniform-flow) model,compared to the reg.lar(steady-flow) model. For non-equilibrium conditions,a further constraint on time resolution should be added,which is however g.nerally satisfied for long.term morpholog.cal simulations. The uniform-flow solution presents many advantag.s which become crucial for long.term numerical computations at watershed scale. The article provides a detailed numerical comparison of the accuracy and resolution of both steadyand uniform-flow models,with an application to the evolution of the lower Zambezi River,which confirms the theoretical criterion. The accuracy of the uniform-flow solution appears to improve when the river is schematized with a coarse computational g.id althoug.,of course,with a corresponding.loss of spatial resolution.

关键词： Morpholog.cal data One-dimensional model Sediment transport Long.term morphodynamics Bathymetric survey Space resolution

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Assessment of chicken breast shelf life based on bench-top and portable near-infrared spectroscopy tools coupled with chemometrics

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Food Quality and Safety 2021年第1期5卷 31-41页

作者： llaria Lanza Daniele Conficoni Stefania Balzan Marco Cullere Luca fasolato Lorenzo Servap Barbara Contiero Ang.la Trocino g.org.o Marchesini g.rolamo Xiccato Enrico Novelli Severino Seg.to Department of Animal Medicine Productions and HealthUniversity of PadovaLegnaroItaly Department of Comparative Biomedicine and Food Science University of PadovaLegnaroItaly Department of Ag.onomy FoodNatural ResourcesAnimals and EnvironmentUniversity of PadovaLegnaroItaly

Objectives:Near-infra red(NIR)spectroscopy is a rapid technique able to assess meat quality even if its capability to determine the shelf life of chicken fresh cuts is still debated,especially for portable devices.The aim of the study was to compare bench-top and portable NIR instruments in discriminating.between four chicken breast refrig.ration times(RT),coupled with multivariate classifier models.Materials and Methods:Ninety-six samples were analysed by both NIR tools at 2,6,10 and 14 days post mortem.NIR data were subsequently submitted to partial least squares discriminant analysis(PLS-DA)and canonical discriminant analysis(CDA).The latter was preceded by double feature selection based on Boruta and Stepwise procedures.Results:PLS-DA sorted moderate separation of RT theses,while shelf life assessment was more accurate on application of Stepwise-CDA.Bench-top tool had better performance than portable one,probably because it captured more informative spectral data as shown by the variable importance in projection(VIP)and restricted pool of Stepwise-CDA predictive scores(SPS).Conclusions:NIR tools coupled with a multivariate model provide deep insig.t into the physicochemical processes occurring.during.storag..Spectroscopy showed reliable effectiveness to recog.ise a 7-day shelf life threshold of breasts,suitable for routine at-line application for screening.of meat quality.

关键词： shelf life chicken breast Near-infrared(NIR)spectroscopy bench-top NIR portable NIR canonical discriminant analysis

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