Search results for "Planetary Science"

De la monogamie au « polygaming »…

2014

Les sites de rencontres ont favorisé l’essor d’un « papillonnage » numérique intensif. Maints inscrits de ces sites inventent à leur corps défendant de nouvelles manières d’aimer, déliées des exigences de la fidélité ou de l’inscription dans la durée. Les cadres normatifs évoluent, alors qu’Internet offre désormais à la rencontre amoureuse de nouveaux terrains de « drague » et des modalités technologiques et relationnelles augmentées. Ce dispositif permet l’émergence de rapports d’un nouveau genre, tout en industrialisant la rencontre amoureuse. Le polygaming est une solution de rechange sentimentalo-sexuelle bousculant la monogamie instituée en favorisant l’essor de relations ludiques, plu…

Observation of intrinsically bright terrestrial gamma ray flashes from the Mediterranean basin

2015

Abstract  We present three terrestrial gamma ray flashes (TGFs) observed over the Mediterranean basin by the Reuven Ramaty High Energy Solar Spectroscope Imager (RHESSI) satellite. Since the occurrence of these events in the Mediterranean region is quite rare, the characterization of the events was optimized by combining different approaches in order to better define the cloud of origin. The TGFs on 7 November 2004 and 16 October 2006 came from clouds with cloud top higher than 10–12 km where often a strong penetration into the stratosphere is found. This kind of cloud is usually associated with heavy precipitation and intense lightning activity. Nevertheless, the analysis of the cloud type…

Triassic lingulide brachiopods from the Iberian Range (Spain)

1999

Abstract During the Middle Triassic marine transgression in Spain, several lingulide populations were fossilized in the Iberian Range (western part of Sephardic Province) and the recorded specimens have been described previously under several specific names. The paleontological aspects of the Jalance (Valencia province) section have been studied for the first time. Its exceptionally large population was fossilized in situ as flat-lying valves and can be interpreted as an autochthonous association related to a very shallow marine environment. The lingulide specimens belong to the genus Lingularia Biernat & Emig , 1993 , but the species name remains under debate, probably Lingularia smirnovae…

Taphonomy of the vertebrate bone beds from the Klūnas fossil site, Upper Devonian Tērvete Formation of Latvia

2012

Combined sedimentological and taphonomical study of the siliciclastic sequence of the Tērvete Formation in the stratotypical area was aimed at revealing the formation of the three oryctocoenoses discovered and related structural and textural features of the deposits, as well as at detailed observation of the taphonomical peculiarities of the obtained palaeontological material. The fossil vertebrate assemblage is represented by 14 taxa comprising placoderms, acanthodians, sarcopterygians and actinopterygians. The three oryctocoenoses, first recognized in 2010, differ in the proportions of repeatedly buried material, in the number and degree of preservation of small and fragile skeletal eleme…

Vale of Tears: The Dangerous Health Effects of Tear Gas Used in the Hong Kong Pro-Democracy Movement

2020

Solar photovoltaic‑based microgrid hosting capacity evaluation in electrical energy distribution network with voltage quality analysis

2021

Abstract In this paper, solar photovoltaic hosting capacity within the electrical distribution network is estimated for different buses, and the impacts of high PV penetration are evaluated using power hardware-in-loop testing methods. It is observed that the considered operational constraints (i.e. voltage and loadings) and their operational limits have a significant impact on the hosting capacity results. However, with increasing photovoltaic penetration, some of the network buses reach maximum hosting capacity, which affects the network operation (e.g. bus voltages, line loading). The results show that even distributing the maximum hosting capacity among different buses can increase the…

Medioambiente y sostenibilidad en ciudades inteligentes y áreas despobladas de Europa

2022

Las ciudades inteligentes disponen de entornos urbanos que tratan de utilizar las modernas TIC (tecnologías de la información y la comunicación). El objeto de este artículo es valorar cómo se desarrolla la sostenibilidad en ciudades inteligentes y áreas despobladas de Europa. Concluimos que la transformación a ciudad inteligente sostenible requiere de la elaboración de un plan de ciudad consensuado con las distintas formaciones políticas y los grupos de interés.

Elementary Clothoid-Based Three-Dimensional Curve for Unmanned Aerial Vehicles

2022

UNMANNED aerial vehicles (UAVs), either multirotor or fixed-wing UAVs, can be used in many fields to solve complex problems in safety [1], communications [2, 3], military applications [4, 5], civilian applications [6, 7], protection of nuclear plants [8], energy efficiency [9], nonlinear control [10, 11], and path planning [12], among others. Vertical takeoff and landing (VTOL) is by far the most used UAV's configuration [13]. Probably the main reason is that, nowadays, there are lots of low-cost multirotor models. VTOL strategies can be applied to fixed-wing airplanes [14]; however, in normal operation they usually fly horizontally to keep a constant altitude [15, 16], but they need to per…

Mechanisms of fluid flow and fluid-rock interaction in fossil metamorphic hydrothermal systems inferred from vein-wallrock patterns, geometry and mic…

2001

Comparison of mass transfer patterns, geometry and microstructures developed within and around veins allows the interpretation of processes of fluid flow during deformation, metamorphism and mineralization. A classification of vein types based on the degree of interaction with wallrock (using petrological, geochemical or isotopic indicators) can be used to identify a range of processes, from closed system behaviour in which the vein mass is derived from local wallrock, through to open system behaviour in which the vein mass is derived externally. Microstructural characteristics, such as wallrock selvages, multiple growth events recorded by vein seams and vein crystal morphology, also help t…

Three-dimensional evolution of the Keuper of the Paris basin based on detailed isopach maps of the stratigraphic cycles: tectonic influences

1997

Detailed isopach maps of the stratigraphic cycles of the Keuper of the Paris basin are used to reconstruct the 3D evolution of the basin cycle by cycle and to investigate the influence of tectonic movements. The major base-level cycles record variations in the rate of subsidence in time and space. The area of greatest subsidence, which was confined to the east of the basin during the Scythian–Carnian cycle, shifted northwestwards during the Carnian–Liassic cycle. Within the “Marnes irisees inferieures”, the E–W faults abruptly limited the extent of salt deposits to the north and south by forming a “corridor” where subsidence was greater. The westward shift of areas of subsidence induced by …