Search results for "Heterogeneity."

showing 10 items of 388 documents

METODOLOGIE DI ANALISI DEL PAESAGGIO NELLA VALUTAZIONE DELL’ETEROGENEITÁ STRUTTURALE NEI REEF A VERMETI

2012

Landscape ecology is a discipline that uses many indices to describe environmental dynamics as a function of structural patch organization. Application of landscape ecology methods can be a way to evaluate heterogeneity and fragmentation of a habitat. Landscape indices were applied to evaluate if the algal heterogeneity of a vermetid reef can be related to the reef structure. Results show that heterogeneity is independent from reef width, but algal patches are wider and less abundant in a large cuvette and less wide but in higher number in small cuvette.

Settore BIO/07 - Ecologiapatchiness vermetid reefs heterogeneity Mediterranean Sea
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Modelling choice behaviour and taste heterogeneity of carriers trough stated preference survey: an application to Sicilian operators

2009

Settore ICAR/05 - TrasportiHeterogeneity Freight transport
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Ancora sulle "esplosive palatali" nelle inchieste dell'Atlante Linguistico del Mediterraneo (ALM): i punti albanesi

2021

Tra i «Problemi redazionali» emersi in fase di controllo e organizzazione dei materiali giunti dalla campagna di rilevamenti dell’Atlante Linguistico del Mediterraneo (ALM), Berruto (1971-1973) rileva la proliferazione e l’eterogeneità di alcune scelte grafemiche operate da diversi raccoglitori che, impegnati in una trascrizione più o meno puntuale delle risposte ottenute, avevano interpretato e risolto variamente alcune delle indicazioni previste nel sistema di trascrizione fonetica che accompagnava il Questionario. Particolarmente complesso era emerso il quadro relativo alla trascrizione di alcune consonanti del settore “palatale”, per le quali i grafemi (e i foni a essi corrispondenti) p…

Settore L-FIL-LET/12 - Linguistica ItalianaAmong the «Editorial problems» that emerged during the control and organization of the materials coming from the survey campaign of the Atlante Linguistico del Mediterraneo (ALM) Berruto (1971-1973) notes the proliferation and heterogeneity of some graphemic choices made by different field researchers. As they were engaged in a more or less punctual transcription of the answers obtained they had interpreted and solved differently some of the directions provided in the phonetic transcription system that accompanied the Questionnaire. The picture relating to the transcription of some consonants of the palatal sector had emerged as particularly complex since the graphemes (and the corresponding phones) foreseen in the original system (ALM 1959) were insufficient. Not even the 1971 updates meant to improve the representation of some phonetic features emerged from the investigations in the operations of Response reviewing allowed to obtain a clear homogeneous picture regarding the «plosive palatal» consonants. With regard to the phonetic trait under scrutiny I have already had the opportunity to propose a path aiming to the achievement of possible operational solutions. This has taken place in view of the planned simplification / homologation and transcoding phase from the ALM original system to the IPA one - while proceeding from the examination of the Schedoni’s current state with regard to the surveys referring to central-southern Italy Corsica and Sicily (see Matranga 2019). The scope is now to investigate the same phonetic trait as proven in the materials about the surveys carried out by Lirak Dodbiba in the ALM’s three Albanian points.
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Heterogeneous vertical structure of the bacterioplankton community in a non-stratified Antarctic lake

2013

10 páginas, 4 figuras, 2 tablas.

Shetlandgeographygeography.geographical_feature_categoryBacteriaEcologyBiological stratificationDrainage basinGeologyGlacierBacterioplanktonStratification (vegetation)BiologyOceanographyOceanographyWater columnBenthic zoneSeawaterVertical heterogeneity16S rRNAMaritime Antarctic lakesEcology Evolution Behavior and SystematicsAntarctic Science
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Intra-Tumour Genetic Heterogeneity and Prognosis in High-Risk Neuroblastoma

2021

Simple Summary Neuroblastoma (NB) is the most common extra-cranial solid paediatric cancer and is responsible for 15% of childhood cancer deaths. Patients with NB are characterized by presenting a very heterogeneous clinic (inter-tumoural heterogeneity) and also both spatial and temporal intra-tumour heterogeneity (ITH) reflected in their genetic aberrations, which may be the consequence of the coexistence of different microenvironments within the tumour. Applying pangenomic techniques to detect genomic aberrations in different biopsies (solid and liquid) of high risk NB (HR-NB) we have detected spatial ITH in a surprisingly high percentage (almost 40%) of the studied cohort. Moreover, a po…

Solid tumourCancer Research<i>MYCN</i> amplificationGenetic heterogeneityMYCN amplificationNeoplasms. Tumors. Oncology. Including cancer and carcinogensGenomicsctDNABiologySNPaArticleOncologyMycn amplificationGenomic ProfileCancer researchgenomicssegmental chromosomal aberrationHigh risk neuroblastomaLiquid biopsytumour microenvironmentSurvival rateRC254-282Cancers
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Contrasting age-specific recruitment and survival at different spatial scales: A case study with the European storm petrel

2009

Evolutionary studies on optimal decisions or conservation guidelines are often derived by generalising patterns from a single population, while inter-population variability in life-history traits is seldom considered. We investigated here how survival and recruitment probabilities changed with age at different geographical scales using the encounter histories of 5523 European storm petrels from three Mediterranean colonies, and also how our estimates of these parameters might be expected to affect population growth rates using population matrix models. We recorded similar patterns among colonies, but also important biological differences. Local survival, recruitment and breeding success inc…

Southern EuropeConservation managementSurvivalPopulationSettore BIO/05 - ZoologiaVulnerabilityPredationAge structurePredationLife history theoryBenidormPopulation modelingbiology.animalLife history theoryPopulation growthPopulation growthMortalityeducationEcology Evolution Behavior and SystematicsSpecies conservationeducation.field_of_studybiologyReproductive successGrowth rateEcologySpatial analysisReproductive successSeabirdSpatial heterogeneitySpainHydrobates pelagicus Recruitment Mediterranean populationsLife history traitSeabirdVital ratesComunidad ValencianaRecruitment (population dynamics)
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Proximal-sensing-powered modelling of energy-water fluxes in a vineyard: A spatial resolution analysis

2021

Spatial resolution is a key parameter in energy–water surface flux modelling. In this research, scale effects are analyzed on fluxes modelled with the FEST-EWB model, by upscaling both its inputs and outputs separately. The main questions are: (a) if high-resolution remote sensing images are necessary to accurately model a heterogeneous area; and (b) whether and to what extent low-resolution modelling provides worse/better results than the upscaled results of high-resolution modelling. The study area is an experimental vineyard field where proximal sensing images were obtained by an airborne platform and verification fluxes were measured via a flux tower. Modelled fluxes are in line with th…

Spatial resolutionPixelEvapotranspirationEnergy-balance modelScienceQVineyardSpatial heterogeneityFlux (metallurgy)Approximation errorEvapotranspirationUpscalingCalibrationGeneral Earth and Planetary SciencesEnvironmental scienceImage resolutionEnergy (signal processing)Settore ICAR/06 - Topografia E CartografiaRemote sensing
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Conflict and segregation in networks: An experiment on the interplay between individual preferences and social influence

2016

We examine the interplay between a person's individual preference and the social influence others exert. We provide a model of network relationships with conflicting preferences, where individuals are better off coordinating with those around them, but where not all have a preference for the same action. We test our model in an experiment, varying the level of conflicting preferences between individuals. Our findings suggest that preferences are more salient than social influence, under conflicting preferences: subjects relate mainly with others who have the same preferences. This leads to two undesirable outcomes: network segregation and social inefficiency. The same force that helps peopl…

Statistics and Probability0209 industrial biotechnology021103 operations researchApplied Mathematicsjel:D85jel:C72jel:D820211 other engineering and technologiesjel:C6202 engineering and technologyEconomiaHeterogeneity Social Networks Formation Equilibrium selectionPreferenceTest (assessment)020901 industrial engineering & automationAction (philosophy)SalientEquilibrium selectionModeling and SimulationEconomicsInefficiencySocial psychologySocial influenceJournal of Dynamics and Games
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Marginal hazard ratio estimates in joint frailty models for heart failure trials

2019

Abstract This work is motivated by clinical trials in chronic heart failure disease, where treatment has effects both on morbidity (assessed as recurrent non‐fatal hospitalisations) and on mortality (assessed as cardiovascular death, CV death). Recently, a joint frailty proportional hazards model has been proposed for these kind of efficacy outcomes to account for a potential association between the risk rates for hospital admissions and CV death. However, more often clinical trial results are presented by treatment effect estimates that have been derived from marginal proportional hazards models, that is, a Cox model for mortality and an Andersen–Gill model for recurrent hospitalisations. …

Statistics and ProbabilityBiometryleast false parameterDiseasejoint frailty modelRisk AssessmentStudy durationCardiovascular deathunexplained heterogeneitymedicineHumansTreatment effectComplex Regression ModelsProportional Hazards ModelsHeart FailureClinical Trials as TopicProportional hazards modelbusiness.industryheart failure trialsHazard ratioGeneral Medicinemedicine.diseaseClinical trialrecurrent eventsHeart failureAsymptomatic DiseasesStatistics Probability and UncertaintybusinessDemographyResearch PaperBiometrical Journal. Biometrische Zeitschrift
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La Valle dei Templi in epoca medioevale. Caratterizzazione antropologica e paleopatologica delle sepolture antistanti in Tempio della Concordia

2021

Riassunto ― Il lavoro presenta i risultati delle analisi bio-archeologiche effettuate su resti scheletrici umani rinvenuti in quattordici sepolture di epoca medioevale rinvenute nel Parco Archeologico della Valle dei Templi di Agrigento (Sicilia). L’obiettivo è stato l’acquisizione delle informazioni necessarie per la ricostruzione del profilo biologico di ciascun individuo, al fine di determinarne il sesso, la stima dell’età biologica alla morte, la stima della statura e la valutazione delle patologie e degli indicatori di stress occupazionale mediante le correnti metodologie e tecniche diagnostiche di tipo antropologico. Sebbene il cattivo stato di conservazione di alcuni individui non ne…

Summary ― The work presents the results of the bio-archaeological analyzes carried out on human skeletal remains found in fourteen burials of Medieval chronology at the Archaeological Park of Valle dei Templi in Agrigentum (Sicily). The aim of the work was the acquisition of the information necessary for the reconstruction of the biological profile of each individual throught the determination of sex the estimate of the biological age at death the estimate of height and the evaluation of pathologies and markers of occupational stress through current anthropological diagnostic methodologies and techniques. Althought the poor state of conservation of some individuals has not allowed their whole anthropological characterization the investigations have highlighted the heterogeneity relating to the age groups and have allowed us to ascertain the presence of pathological alterations in subjects of mature age sometimes of unknown etiology such as DISH (Diffuse Idiopathic Hyperostosis). The sample size is not representative of the entire population but subsequent insights will provide a better understanding of the population dynamics of Medieval Agrigentum.Settore BIO/08 - Antropologia
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