Search results for " objects"
showing 10 items of 186 documents
The LOFT mission concept: a status update
2016
The Large Observatory For x-ray Timing (LOFT) is a mission concept which was proposed to ESA as M3 and M4 candidate in the framework of the Cosmic Vision 2015-2025 program. Thanks to the unprecedented combination of effective area and spectral resolution of its main instrument and the uniquely large field of view of its wide field monitor, LOFT will be able to study the behaviour of matter in extreme conditions such as the strong gravitational field in the innermost regions close to black holes and neutron stars and the supra-nuclear densities in the interiors of neutron stars. The science payload is based on a Large Area Detector (LAD, >8m2 effective area, 2-30 keV, 240 eV spectral resolut…
Arrangements de cercles sur une sphère: Algorithmes et Applications aux modèles moléculaires representés par une union de boules
2008
Since the early work of Richard et al., geometric constructions havebeen paramount for the description of macromolecules and macro-molecularassemblies. In particular, Voronoï and related constructions have beenused to describe the packing properties of atoms, to compute molecularsurfaces, to find cavities. This thesis falls in this realm, andafter a brief introduction to protein structure, makes fourcontributions.First, using the sweep line paradigm of Bentley and Ottmann, wepresent the first effective algorithm able to construct the exactarrangement of circles on a sphere. Moreover, assuming the circlesstem from the intersection between spheres, we present a strategy to reportthe covering …
Non conventional Imaging Systems for 3D Digitization of transparent and/or specular manufactured objects
2013
International audience; 3D scanning has been investigated for several years and most of the proposed approaches assume a diffuse or near diffuse reflectance of the object's surface, also called cooperative surfaces. For the case of "non cooperative surfaces", such as transparent objects or mirror-like surfaces, usually, a thin layer of powder is sprayed onto the object surface (to make it opaque and diffuse) prior to its digitization. This extra step is troublesome, time consuming (the object needs to be cleaned afterwards), and the final accuracy is often dependent on the powder thickness and its homogeneousness. To avoid this step, various methods have been investigated over the last few …
γ-RAY AND PARSEC-SCALE JET PROPERTIES OF A COMPLETE SAMPLE OF BLAZARS FROM THE MOJAVE PROGRAM
2011
著者人数: 145名
The Large Area Detector of LOFT: the Large Observatory for X-ray Timing
2014
LOFT (Large Observatory for X-ray Timing) is one of the five candidates that were considered by ESA as an M3 mission (with launch in 2022-2024) and has been studied during an extensive assessment phase. It is specifically designed to perform fast X-ray timing and probe the status of the matter near black holes and neutron stars. Its pointed instrument is the Large Area Detector (LAD), a 10 m 2 -class instrument operating in the 2-30keV range, which holds the capability to revolutionise studies of variability from X-ray sources on the millisecond time scales. The LAD instrument has now completed the assessment phase but was not down-selected for launch. However, during the assessment, most o…
LOFT: the Large Observatory For X-ray Timing
2012
The LOFT mission concept is one of four candidates selected by ESA for the M3 launch opportunity as Medium Size missions of the Cosmic Vision programme. The launch window is currently planned for between 2022 and 2024. LOFT is designed to exploit the diagnostics of rapid X-ray flux and spectral variability that directly probe the motion of matter down to distances very close to black holes and neutron stars, as well as the physical state of ultra-dense matter. These primary science goals will be addressed by a payload composed of a Large Area Detector (LAD) and a Wide Field Monitor (WFM). The LAD is a collimated (<1 degree field of view) experiment operating in the energy range 2-50 keV,…
Kuka minä olen? Monikulttuuristen opiskelijoiden identiteettipuhetta
2008
Young people with immigrant backgrounds follow different paths to acculturate. Some integrate into the new society so that they cannot be singled out from the majority; others maintain their ethnic culture in addition to adopting values of the larger society. Alternatively, some immigrant youth distance themselves from both their parents' culture and new one. The challenge for second generation immigrants is that they have to make a double transition to adulthood. Immigrant adolescents develop an identity as members of their own group, and to varying degrees, as members of the lager society. Because of the variety of influences and opportunities they face in making choices on these issues, …
Characterization of commercial synthetic resins by pyrolysis-gas chromatography/mass spectrometry: application to modern art and conservation.
2009
To characterize a set of synthetic resins, a methodology by pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) has been developed. The studied reference materials were commercial versions of a wide range of synthetic resins. For each polymer, the pyrolytic and chromatographic conditions were optimized to adequately resolve the fragment mixture in a short time. The proposed analytical method does not require previous treatment of the sample, and due to its high sensitivity, only a small sample quantity in the microgram range can be used. The pyrolysis temperature was found to have little effect on the obtained pyrograms. The summarized data set for the individual polymer materials, es…
OGGETTIVAZIONE E STORICITÀ DEI BENI COMUNI
2017
The progress of the commons as main subject in social sciences and in public debate has caused a new focus on the genealogy of proprietorship and his ideology. Framing this ideology, for a long time individual proprietorship has been represented as opposite to discourses that justified collective resource management. However, looking at the past of juridical systems, it is possible to highlight several links between individual property rights and collective rights. In particular historical analysis reveals that the main conceptual tool for producing both individual and collective ownership consists in instituting the goods as «objects». Both individual ownership and common goods are the eff…
Els epítets dels artistes baixmedievals al servei dels poders reial i municipal
2021
Aquest article estudia els adjectius que van rebre els artistes que treballaren per al rei i per a les elits ciutadanes en els territoris de parla catalana durant els segles XIV i XV. En particular, se n’hi examinen dos: apte i subtil. Les notícies exhumades per uns altres especialistes fins al moment permeten comprendre’ls en el propi context documental. Ací es compara el seu significat amb uns altres exemples de la literatura baixmedieval de la Corona d’Aragó i es du a terme una aproximació històrica com a paraules que al·ludien a la perícia de l’artista i que van ser escollides amb una finalitat. Participaren i repercutiren, per tant, en la relació històrica de l’artista amb el client, …