Search results for " Phase angle"

showing 4 items of 4 documents

A Multiplicity result for a class of strongly indefinite asymptotically linear second order systems

2010

We prove a multiplicity result for a class of strongly indefinite nonlinear second order asymptotically linear systems with Dirichlet boundary conditions. The key idea for the proof is to bring together the classical shooting method and the Maslov index of the linear Hamiltonian systems associated to the asymptotic limits of the given nonlinearity.

Class (set theory)Pure mathematicsApplied MathematicsMathematical analysisLinear systemMultiplicity (mathematics)34B15 37J05 53C50Functional Analysis (math.FA)Hamiltonian systemMathematics - Functional AnalysisNonlinear systemsymbols.namesakeShooting methodMathematics - Classical Analysis and ODEsSettore MAT/05 - Analisi MatematicaDirichlet boundary conditionClassical Analysis and ODEs (math.CA)FOS: MathematicssymbolsOrder (group theory)Multiplicity Asymptotically linear BVP Maslov index Phase angleAnalysisMathematics
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BIOELECTRICAL PHASE ANGLE ON HOSPITAL ADMISSION AS PREDICTOR OF SHORT- AND MIDDLE-TERM MORTALITY IN ELDERLY MEDICAL PATIENTS.

2013

Settore MED/09 - Medicina InternaSettore MED/50 - Scienze Tecniche Mediche ApplicateSettore MED/49 - Scienze Tecniche Dietetiche Applicatehospital malnutrition elderly BIA phase angle
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Phenotypic Aspects of Longevity

2019

Centenarians are individuals who live over the average life span characteristic of their population. The growing number of old people worldwide makes it necessary to identify a good strategy to reach healthy ageing and avoid or delay age-related diseases. The longevity phenotype is the result of a positive combination between genetic, epigenetic, stochastic and lifestyle factors. So, the analysis of all the known parameters that can influence these single elements or their interaction can give new possible elements to delineate a sort of longevity signature. Starting from the easiest biomarkers as the haematochemical values and reaching the study of molecular and cellular components, as the…

Settore MED/04 - Patologia Generaleeducation.field_of_studymedia_common.quotation_subjectPopulationLongevityImmunosenescenceBiologyPhenotypeAgeingEvolutionary biologyAgeing Body composition Centenarians Inflamm-ageing Longevity Phase angle.Life expectancyEpigeneticsCentenarianeducationmedia_common
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Sign-preserving solutions for a class of asymptotically linear systems of second-order ordinary differential equations

2022

We study multiplicity of solutions to an asymptotically linear Dirichlet problem associated with a planar system of second order ordinary differential equations. The existence of two sign-preserving component-wise solutions is guaranteed when the Morse indexes of the linearizations at zero and at infinity do not coincide, and one of the asymptotic problems has zero-index. The proof is developed in the framework of topological and shooting methods and it is based on a detailed analysis and characterization of the phase angles in a two-dimensional setting.

Settore MAT/05 - Analisi MatematicaApplied MathematicsAnalysisAsymptotically Linear Planar Systems Sign-preserving Solutions Morse Index Phase Angles
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