Search results for "FOS"
showing 10 items of 15075 documents
On the location of the supermassive black hole in CTA102
2015
Relativistic jets in active galactic nuclei represent one of the most powerful phenomena in the Universe. They form in the surroundings of the supermassive black holes as a by-product of accretion onto the central black hole in active galaxies. The flow in the jets propagates at velocities close to the speed of light. The distance between the first part of the jet that is visible in radio images (core) and the black hole is still a matter of debate. Only very-long-baseline interferometry observations resolve the innermost compact regions of the radio jet. Those can access the jet base, and combining data at different wavelenghts, address the physical parameters of the outflow from its emiss…
Noyen-sur-Seine (Seine-et-Marne), Nord du Bois du Chêne, Caille-Boton, La Chapotte et Le Haut du Faÿ : phase 2 : rapport de diagnostic
2011
Ce diagnostic se situe sur la commune de Noyen-sur-Seine, sur une carrière d'exploitation de granulats. Il a permis la mise au jour de structures du Campaniforme au Nord-Est du site, de l'étape moyenne du Bronze final (culture Rhin-Suisse-France orientale) et du Hallsatt D2/3-La Tène A. Les structures de la culture RSFO sont en continuité avec celles mises au jour lors du diagnostic sur la parcelle adjacente (Samzun, 2009), et qui ont donné lieu à une fouille durant l'été 2010 (Nallier, à paraître). Les structures du Hallstatt sont apparues au Nord-ouest du décapage.
Jaulnes (Seine-et-Marne), "Les Graviers" : rapport de diagnostic
2010
Ce diagnostic a permis la mise au jour de structures du Néolithique récent/final dont une sépulture, ainsi que des monuments funéraires protohistoriques et des structures gallo-romaines.
Rīku kopa latviešu valodas semantikas analīzei : publikāciju kopa
2018
Promocijas darba pētījuma priekšmets ir automātiskas teksta analīzes metodes, apskatot visus dabiskās valodas apstrādes līmeņus, kas nepieciešami teksta semantiskai analīzei, īpaši pievēršoties risinājumiem, kuri trūka latviešu valodas teksta analīzei. Darbs ir izstrādāts 5 gadu laikā LU MII 4 pētījumu projektu un 2 valsts pētījumu programmu ietvaros. Darbā tiek aprakstītas autora realizētās metodes latviešu valodas nosaukto entitāšu atpazīšanai un piesaistei reālijām. Zināšanu formālās reprezentācijas vajadzībām ir izveidota FrameNet ontoloģija personu un organizāciju datu un attiecību modelēšanai. Darbā ir piedāvāts un realizēts latviešu valodas morfoloģiskās struktūras formāls modelis ar…
Estudio farmacológico de los IPDE5 e IPDE5/NO en modelos in vitro de disfunción endotelial
2020
La morbilidad cardiovascular es la principal causa de muerte en pacientes diabéticos. La fisiopatología de estas alteraciones vasculares aun no está del todo dilucidada. La hiperglucemia, característica principal de la diabetes, exacerba las complicaciones macrovasculares y las complicaciones microvasculares como la retinopatía, la nefropatía o el pie diabético. La elevación de la glucosa en sangre conduce a una alteración de la función del endotelio, modificando algunas de sus funciones básicas como la regulación del tono y crecimiento vascular o la coagulación sanguínea. La disfunción endotelial se produce en gran medida por el estrés oxidativo y la formación de radicales libres de oxigen…
Characterization of high-temperature performance of cesium vapor cells with anti-relaxation coating
2017
© 2017 Author(s). Vapor cells with antirelaxation coating are widely used in modern atomic physics experiments due to the coating's ability to maintain the atoms' spin polarization during wall collisions. We characterize the performance of vapor cells with different coating materials by measuring longitudinal spin relaxation and vapor density at temperatures up to 95 °C. We infer that the spin-projection-noise-limited sensitivity for atomic magnetometers with such cells improves with temperature, which demonstrates the potential of antirelaxation coated cells in applications of future high-sensitivity magnetometers.
Ammonium adsorption, desorption and recovery by acid and alkaline treated zeolite
2021
In this study, the suitability of zeolite as a possible medium for ammonium adsorption, desorption and recovery from wastewater was investigated. Specifically, batch adsorption and desorption studies with solutions enriched in NH$_4^+$ were conducted employing zeolite to evaluate how the chemical treatment and contact time affect adsorption and desorption. Several experimental tests were carried out considering both untreated and treated zeolite. Untreated and HCl-Na treated zeolite adsorbed up to 11.8 mg NH$_4^+$ g$^{-1}$ and showed the highest efficiency in recovering NH$_4^+$ from aqueous solution. Regardless of pre-treatment, treatments with NaCl resulted in higher and faster adsorption…
Optical determination and identification of organic shells around nanoparticles: application to silver nanoparticles
2013
We present a simple method to prove the presence of an organic shell around silver nanoparticles. This method is based on the comparison between optical extinction measurements of isolated nanoparticles and Mie calculations predicting the expected wavelength of the Localized Surface Plasmon Resonance of the nanoparticles with and without the presence of an organic layer. This method was applied to silver nanoparticles which seemed to be well protected from oxidation. Further experimental characterization via Surface Enhanced Raman Spectroscopy (SERS) measurements allowed to identify this protective shell as ethylene glycol. Combining LSPR and SERS measurements could thus give proof of both …
A measurement of the neutron to 199Hg magnetic moment ratio
2014
The neutron gyromagnetic ratio has been measured relative to that of the 199Hg atom with an uncertainty of 0.8 ppm. We employed an apparatus where ultracold neutrons and mercury atoms are stored in the same volume and report the result γn/γHg=3.8424574(30).
The Use of Ca- and Mg-Rich Fly Ash as a Chemical Precipitant in the Simultaneous Removal of Nitrogen and Phosphorus - Recycling and Reuse
2019
The European Union’s circular economy strategy aims to increase the recycling and re-use of products and waste materials. According to the strategy, the use of industry waste material should be more effective. A chemical precipitation method to simultaneously remove phosphorus and nitrogen from synthetic (NH4)2HPO4 solution and the liquid phase of anaerobic digestate using fly ash as a precipitant was tested. Fly ash is a waste material formed in the power plant process. It mainly contains calcium oxide (CaO) and magnesium oxide (MgO). Saturated precipitant solution was prepared from fly ash, which was added in small proportions to (NH4)2HPO4 solution during the experiment. Fly ash’s effect…