Search results for "HTN"
showing 10 items of 252 documents
The Enlightenment in Spain: Classic and New Historiographical Perspectives
2020
Este capítulo ofrece una revisión historiográfica de la Ilustración española, situada tanto en el contexto de los estudios específicos como de las controversias más amplias suscitadas en el ámbito internacional: cuestiones de cronología, vínculos entre la Ilustración y la religión (más específicamente el catolicismo), circulación de ideas, aproximaciones intelectuales o más bien socioculturales, contraste y relación entre "centros" y "periferias", o entre Ilustraciones "radicales" y convencionales". El texto pone de relieve las nuevas perspectivas analíticas, muy especialmente las abiertas por los estudios sobre mujeres y género, sobre culturas "populares" y sobre dimensiones atlánticas e i…
Protection of Trees against Lightning Strikes as a Measure to Prevent Fires and Loss of Human Life
2021
Lighting strikes have been the catalyst of massive uncontrolled fires in areas of combustible vegetation. In some regions, lightning strikes may be a relatively unusual occurrence (e.g., California), but instead they seem to have become a major contributor to the propagation of wildfires, as a byproduct of climate change. Given such unusual weather, wildfires originating from lightning are an increasing threat. In this paper, the authors discuss the withstand capability of trees against lightning and introduce a proactive approach to prevent wildfires by the deployment of tree lighting protection systems (TLPS) to protect forested areas, where deemed necessary by the tree risk assessment.
The XMM Cluster Outskirts Project (X-COP): Thermodynamic properties of the Intracluster Medium out to $R_{200}$ in Abell 2319
2018
We present the joint analysis of the X-ray and SZ signals in A2319, the galaxy cluster with the highest signal-to-noise ratio in Planck maps and that has been surveyed within our XMM Cluster Outskirts Project (X-COP). We recover the thermodynamical profiles by the geometrical deprojection of the X-ray surface brightness, of the SZ comptonization parameter, and an accurate and robust spectroscopic measurements of the temperature. We resolve the clumpiness of the density to be below 20 per cent demonstrating that most of this clumpiness originates from the ongoing merger and can be associated to large-scale inhomogeneities. This analysis is done in azimuthally averaged radial bins and in eigh…
Unveiling the environment and faint features of the isolated galaxy CIG 96 with deep optical and HI observations
2018
Context. Asymmetries in atomic hydrogen (HI) in galaxies are often caused by the interaction with close companions, making isolated galaxies an ideal framework to study secular evolution. The AMIGA project has demonstrated that isolated galaxies show the lowest level of asymmetry in their HI integrated profiles compared to even field galaxies, yet some present significant asymmetries. CIG 96 (NGC 864) is a representative case reaching a 16% level. Aims. Our aim is to investigate the HI asymmetries of the spiral galaxy CIG 96 and what processes have triggered the star-forming regions observed in the XUV pseudo-ring. Methods. We performed deep optical observations at CAHA1.23m, CAHA2.2m and V…
Lightning-induced weathering of Cascadian volcanic peaks
2020
Abstract The process of meteorological lightning-induced modification of coherent volcanic rocks is examined by geochemical, textural, and experimental analysis of fulgurites from South Sister volcano, Oregon Cascades, USA. Lightning's effects on volcanic target rocks was simulated with an arc-welding device in order to reproduce the geochemical and textural features of natural fulgurites and to constrain temperatures of melting and devolatilization behavior during lightning strikes. Melting of volcanic target rocks produces melts of exceptional compositional diversity, ranging from those with pure mineral compositions (e.g., diopside and plagioclase), resulting from congruent melting react…
2021
Abstract The spaceborne detection of volcanic ash clouds at infrared wavelengths helps to avoid regions with enhanced volcanic ash concentrations that pose a threat to aviation. Current volcanic ash data retrievals require detailed information on microphysical properties and the refractive index of volcanic ash, which are highly variable. Uncertainties in the latter currently limit the quality of volcanic ash nowcasts. Here, we introduce a novel method to calculate the complex refractive indices of volcanic ashes at wavelengths from 5 to 15 μm from measurements of their individual components based on generic petrological ash compositions. Thereby the refractive indices for volcanic glasses …
Esa's SMOS Mission – Supporting Agricultural Applications
2018
The European Space Agency's (ESA) SMOS mission, in orbit since more than 8 years, carries a passive microwave interferometric radiometer measuring in L-Band and provides accurate global observations of emitted radiation originating from the Earth's surfaces since the atmosphere is almost transparent in this spectral range. In addition, over land the effect of vegetation on the measurements is smaller than for shorter wavelengths. The scientific objectives of the SMOS mission directly respond to the need for global observations of soil moisture and ocean salinity, two key variables used in predictive hydrological, oceanographic and atmospheric models. SMOS observations also provide informati…
Les plaies de la Grande Guerre dans la Berliner Illustrirte Zeitung, un imaginaire de papier sous la République de Weimar
2021
International audience; Auch nach dem Waffenstillstand wird der Erste Weltkrieg in der Berliner Illustrirten Zeitung (BIZ)-einem der ersten illustrierten Massenblätter-weiter thematisiert. Bei der Untersuchung dieses mediatisierten Krieges wird der Frage nachgegangen, was diese Bilderwelt über die fortschrittlichen Erwartungen, Ängste und Hoffnungen in der Weimarer Republik aussagt. Dabei geht hervor, dass die BIZ nach der anfänglichen Bekundung eines gewissen Wohlwollens gegenüber den ehemaligen Feinden zu Beginn des Jahres 1919 bald in einen bitteren Ton umschlägt, als die Friedensbedingungen bekannt gegeben werden. Diese enttäuschten Hoffnungen haben die kulturelle Demobilisierung der BI…
Interactions between silver nanoparticles and fluorescent phytochromes from Deinococcus radiodurans
2017
Poikkitieteelliset sovellukset ovat viime aikoina yleistyneet tieteellisessä tutkimuksessa. Tämä näkyy hyvin esimerkiksi elävän kudoksen kuvantamisen kehittymisessä, jota varten etsitään jatkuvasti parempia biologisia leimoja fysiikan ja kemian keinoin. Tässä tutkielmassa on kehitetty ensimmäinen lähi-infrapuna-alueen fluoresenssileima, joka hyödyntää hopeananopartikkeleja ja fytokromeja. Kompleksi on syntetisoitu itse ja sen rakenne on todennettu optisen spektroskopian, elektroforeesin ja elektronimikroskopian keinoin. Lupaavat fluoresenssiominaisuudet saatiin käyttämällä monomeerisen Deinococcus radiodurans -fytokromin kromoforia sitovaa domeenia (CBDmon). Hopeapartikkelien läsnäollessa C…
On the distribution of lightning current among interconnected grounding systems in medium voltage grids
2018
This paper presents the results of a first investigation on the effects of lightning stroke on medium voltage installations' grounding systems, interconnected with the metal shields of the Medium Voltage (MV) distribution grid cables or with bare buried copper ropes. The study enables us to evaluate the distribution of the lightning current among interconnected ground electrodes in order to estimate if the interconnection, usually created to reduce ground potential rise during a single-line-to-ground fault, can give place to dangerous situations far from the installation hit by the lightning stroke. Four different case studies of direct lightning stroke are presented and discussed: (1) two …