Search results for " Planet"
showing 10 items of 5473 documents
The legacy of human use in Amazonian palm communities along environmental and accessibility gradients
2023
Aim: Palms are iconic and dominant elements of neotropical forests. In the Amazon region, palms have been used and managed by humans for food, material, medicine and other purposes for millennia. It is, however, debated to what extent the structure of modern palm communities reflects long-term human modification. Here, we investigate the complex interplay of ecological and societal factors that influence the distributions of both human-used and non-used palms in western Amazonia. Location: Amazonia. Time period: Present. Major taxa studied: Palms (Arecaceae). Methods: We used Bayesian hierarchical joint species distribution models to predict the distributions and environmental niche dimensi…
The Aqua-Planet Experiment (APE): CONTROL SST Simulation
2013
Climate simulations by 16 atmospheric general circulation models (AGCMs) are compared on an aqua-planet, a water-covered Earth with prescribed sea surface temperature varying only in latitude. The idealised configuration is designed to expose differences in the circulation simulated by different models. Basic features of the aqua-planet climate are characterised by comparison with Earth. The models display a wide range of behaviour. The balanced component of the tropospheric mean flow, and mid-latitude eddy covariances subject to budget constraints, vary relatively little among the models. In contrast, differences in damping in the dynamical core strongly influence transient eddy amplitudes…
Erosion, screening, and migration of tungsten in the JET divertor
2019
The erosion of tungsten (W), induced by the bombardment of plasma and impurity particles, determines the lifetime of plasma-facing components as well as impacting on plasma performance by the influx of W into the confined region. The screening of W by the divertor and the transport of W in the plasma determines largely the W content in the plasma core, but the W source strength itself has a vital impact on this process. The JET tokamak experiment provides access to a large set of W erosion-determining parameters and permits a detailed description of the W source in the divertor closest to the ITER one: (i) effective sputtering yields and fluxes as function of impact energy of intrinsic (Be,…
Alteration-Induced Volcano Instability at La Soufrière de Guadeloupe (Eastern Caribbean)
2021
International audience; Volcanoes are unstable structures that deform laterally and frequently experience mass wasting events. Hydrothermal alteration is often invoked as a mechanism that contributes significantly to volcano instability. We present a study that combines laboratory experiments, geophysical data, and large-scale numerical modeling to better understand the influence of alteration on volcano stability, using La Soufrière de Guadeloupe (Eastern Caribbean) as a case study. Laboratory experiments on variably altered (advanced argillic alteration) blocks show that uniaxial compressive strength, Young's modulus, and cohesion decrease as a function of increasing alteration, but that …
Oltre il policentrismo
2021
Il contributo indaga i più recenti sviluppi teorici sul tema del policentrismo negli studi urbani critici, coniugando il sapere tecnico dell'urbanistica con gli stimoli delle scienze sociali. Al di là della ricostruzione del dibattito scientifico, il testo propone alcune possibili declinazioni del concetto di policentrismo nell'antropocene post-pandemico e in un'epoca di urbanizzazione planetaria.
SST Comparison of AVHRR and MODIS Time Series in the Western Mediterranean Sea
2020
La temperatura de la superficie del mar (SST) es un parámetro clave para comprender los procesos atmosféricos y oceánicos. Desde finales de la década de 1980, las imágenes de satélite infrarrojas se han utilizado para complementar los registros in situ para estudiar la variabilidad temporal y espacial de la SST. El radiómetro avanzado de muy alta resolución (AVHRR) del satélite de la Administración Nacional Oceánica y Atmosférica (NOAA) fue el primer sensor utilizado con éxito para calcular la SST después del desarrollo y validación del algoritmo de corrección atmosférica conocido como 'ventana dividida'. Más recientemente, el espectrorradiómetro de imágenes de resolución MODERADA (MODIS) a…
On Line Validation Exercise (OLIVE): A Web Based Service for the Validation of Medium Resolution Land Products. Application to FAPAR Products
2014
International audience; The OLIVE (On Line Interactive Validation Exercise) platform is dedicated to the validation of global biophysical products such as LAI (Leaf Area Index) and FAPAR (Fraction of Absorbed Photosynthetically Active Radiation). It was developed under the framework of the CEOS (Committee on Earth Observation Satellites) Land Product Validation (LPV) sub-group. OLIVE has three main objectives: (i) to provide a consistent and centralized information on the definition of the biophysical variables, as well as a description of the main available products and their performances (ii) to provide transparency and traceability by an online validation procedure compliant with the CEO…
Performance analysis of Latvian zenith camera
2018
Since finalizing of design in 2016, the digital zenith camera of the University of Latvia was involved in a number of test observations as well as field observations at about 70 different sites. The paper presents analysis of observation results, estimation of instrument’s performance and accuracy. Random and systematic error sources are outlined. Impact of anomalous refraction on vertical deflection determination is discussed. Results of adaptation of GAIA reference star catalog for astrometric data reduction are reported.
Toimijuus ja vuorovaikutusjärjestys amerikkalaisten suomenoppijoiden itsenäisessä kielenkäytössä
2021
Aiemmat tutkimukset ovat osoittaneet vastakkainasettelun luokassa ja luokan ulkopuolella tapahtuvassa kielenkäytössä ja oppimisessa. Tässä artikkelissa tarkastelen neljää amerikkalaista suomenoppijaa ja sitä, miten he hakeutuvat aktiivisina toimijoina itsenäisiin suomen kielen käyttötilanteisiin. Artikkelin aineistona on portfoliotehtävä, jossa oppijat ovat dokumentoineet ja reflektoineet itsenäistä, luokkahuoneen ulkopuolella tapahtuvaa kielenkäyttöään. Tarkastelen aineistoa Scollonin ja Scollonin (2004) neksusanalyysia ja van Lierin (2010) ekologista viitekehystä hyödyntäen. Artikkelin analyysimenetelmänä on diskurssianalyysi. Portfolioissa dokumentoidut vuorovaikutustilanteet rakentuivat…
Anàlisi de la violència filioparental en centres de menors : un estudi monogràfic
2019
espanolAntecedentes: El principal objetivo de este estudio era conocer las caracteristicas sociodemograficas, judiciales y psicologicas de los menores infractores que habian sido denunciados por violencia filio-parental, asi como elaborar posibles perfiles a partir de dichas caracteristicas. Metodo: Se analizaron expedientes judiciales correspondientes a 56 adolescentes del Centro de Educacion e Internamiento por Medida Judicial de Zaragoza –Espana–, que habian sido internados por violencia filio-parental en el periodo comprendido entre 2006 y 2016.Resultados: Los resultados indican una importante presencia de antecedentes por acogimiento en centros de proteccion de menores, hogares familia…