Search results for "Planetary Science"
showing 10 items of 4367 documents
El hombre de Montesa en el Consejo de Aragón: aproximación a la figura del Asesor general
2020
Este trabajo pretende paliar el desconocimiento existente sobre el funcionamiento y razón de ser de uno de los cargos más importantes de la orden de Montesa: el asesor general de la orden en el Consejo Supremo de Aragón. Por lo tanto, este trabajo constituye una primera aproximación a esa figura. Nuestro estudio se ha basado en la experiencia de Melchor Sisternes de Oblites y Centoll en ese cargo, entre 1638 y 1642, para abordar el análisis de las funciones que desarrollaba el asesor general de la orden de Montesa.
Epílogo. Cómo funciona el mundo
2019
Balance y reflexión final sobre los artículos publicados en el número.
Interessi cittadini, finanze regie e istituzioni parlamentari nella Sardegna del tardo Medioevo
2016
Il saggio si propone di ricostruire, partendo dalla storiografia sul tema e attraverso l’esame degli atti dei Parlamenti del Regno di Sardegna convocati da Alfonso V nel 1421 e da Ferdinando II fra il 1481 e il 1504, il ruolo delle citta all’interno dell’assemblea parlamentare, il rapporto tra le diverse realta urbane ed il potere regio – rappresentato nell’isola dal vicere e dagli alti funzionari dell’amministrazione regia – , l’onere economico che stesse citta si assumevano con l’approvazione del donativo. La documentazione parlamentare offre uno spaccato della Sardegna reale, con i sui conflitti e con i suoi molteplici problemi, soprattutto di natura economica, ai quali danno voce le cit…
1917, cien años después. Aurora, cénit y ocaso del comunismo ruso
2019
La revolución bolchevique de 1917 cambió radicalmente el rumbo de la vida en buena parte del planeta, a expensas de la Gran Guerra europea y la determinación de sus dirigentes. El artículo narra los acontecimientos y las fases de este experimento sociopolítico y cultural que ha durado setenta años. Cien años después, pretende reabrir la reflexión, contando con el impacto que produjo en la política y las ideas en España y su influencia en la historia del presente.
Quasi-periodic dipping in the ultraluminous X-ray source, NGC 247 ULX-1
2021
Most ultraluminous X-ray sources (ULXs) are believed to be stellar mass black holes or neutron stars accreting beyond the Eddington limit. Determining the nature of the compact object and the accretion mode from broadband spectroscopy is currently a challenge, but the observed timing properties provide insight into the compact object and details of the geometry and accretion processes. Here we report a timing analysis for an 800 ks XMM-Newton campaign on the supersoft ultraluminous X-ray source, NGC 247 ULX-1. Deep and frequent dips occur in the X-ray light curve, with the amplitude increasing with increasing energy band. Power spectra and coherence analysis reveals the dipping preferential…
Aerosol radiative forcing efficiency in the UV region over southeastern Mediterranean: VELETA2002 campaign
2007
Atmospheric aerosol effects on spectral global UV irradiance were evaluated during the VELETA2002 field campaign between 8 and 19 July 2002 in southeast Spain. In the first stage, seven UV spectroradiometer and six CIMEL Sun photometer measurements were carried out simultaneously, allowing them to be calibrated and intercompared. The mean ratio obtained for the global irradiance between the spectroradiometers, with regards to a reference instrument, ranges from 0.98 up to 1.04 with standard deviations that oscillate between ±0.01 and ±0.17. In particular, the two spectroradiometers used to obtain the aerosol forcing efficiencies have a ratio of 1.000 ± 0.001. The aerosol optical depth (AOD)…
Unraveling the exhumation history of high-pressure ophiolites using magnetite (U-Th-Sm)/He thermochronometry
2020
International audience; Magnetite is a ubiquitous oxide in ultramafic and mafic rocks, which is present in a large range of geological and tectonic settings. In the case of high-pressure ultramafic rocks, exhumation timing is commonly constrained by geochronometers in nearby lithologies. The development of the magnetite (U-Th-Sm)/He method (MgHe) has opened new perspectives to refine the exhumation history of such rocks. However no thermal history has been deduced using MgHe data so far. Here we applied MgHe dating to magnetite from an HP-LT alpine ophiolite body (Rocher Blanc) from the Schistes lustres units (Western Alps, France) where part the P-T-t history is constrained to further refi…
Delamination and recycling of Archaean crust caused by gravitational instabilities
2013
The volume of Archaean crust preserved at Earth’s surface today is low. Thermodynamic calculations and geodynamic modelling show that the thick, primary crust that would have formed on a much hotter Archaean Earth was denser than the underlying mantle, and would have therefore been recycled back into the mantle as drips.
Les formations carbonatées du Dortan (Ain) : premières observations
1986
Calcium carbonate, deposits have built four terraces, near Dortan, in the Southern part of Central Jura (46° lat. N). These deposits may just cover other terraces associated themselves with an ice-dammed lake. They include two types : 1) tufa deposits, porous and hard, with conspicuous tree remains ; 2) lake chalk, compact and brittle, snowing lenses and, sometimes, varves, with shells and pieces of charcoal. C 14 dating and analyses should allow to insert these deposits in the Jura Holocene chronology and to explain their situation at such a high latitude.
Harmonizing circumpolar monitoring of Arctic fox: benefits, opportunities, challenges and recommendations.
2017
Source at http://dx.doi.org/10.1080/17518369.2017.1319602 The biodiversity working group of the Arctic Council has developed pan-Arctic biodiversity monitoring plans to improve our ability to detect, understand and report on long-term change in Arctic biodiversity. The Arctic fox (Vulpes lagopus) was identified as a target of future monitoring because of its circumpolar distribution, ecological importance and reliance on Arctic ecosystems. We provide the first exhaustive survey of contemporary Arctic fox monitoring programmes, describing 34 projects located in eight countries. Monitored populations covered equally the four climate zones of the species’ distribution, and there were large dif…