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Search Results: 1 - 10 of 189824 matches for " G. Testera "
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Análisis de los factores determinantes de la transparencia en RSC en las empresas espa olas cotizadas
Adrian Testera Fuertes,Laura Cabeza García
Intangible Capital , 2013, DOI: http://dx.doi.org/10.3926/ic.311
Abstract: Objeto: Este trabajo pretende profundizar en los determinantes de la divulgación de información sobre las acciones sociales que las empresas realizan. En particular, se centra en el papel que puede jugar un factor apenas considerado hasta el momento como es la estructura de propiedad.Dise o/metodología: Con el objetivo anterior, a partir de una muestra de empresas espa olas cotizadas en el a o 2008 hemos realizado un análisis de regresión lineal para analizar cómo la identidad del principal accionista de la empresa así como otras características empresariales afectan a la transparencia en RSC.Aportaciones y resultados: En contra de lo esperado, los resultados sugieren que la identidad del principal accionista no afecta a la transparencia informativa en RSC. Por el contrario, son otras características, como el tama o de la empresa, su nivel de endeudamiento así como su nivel de transparencia en general, las que parecen explicar la transparencia sobre acciones socialmente responsables.Limitaciones: La existencia de otros indicadores de transparencia en RSC así como el haber realizado el estudio en un único país y en un momento temporal concreto, hace necesario ser cautos sobre los hallazgos obtenidos.Valor a adido: Un número reducido de estudios ha analizado la influencia de la estructura de propiedad en la transparencia en RSC, y además, de los pocos trabajos existentes, la mayoría se han centrado en el grado de concentración de la propiedad y no han tenido en cuenta la identidad o tipología del primer accionista.
Multi-Layered Films Containing a Biomimetic Stimuli-Responsive Recombinant Protein
Barbosa JS,Costa RR,Testera AM,Alonso M
Nanoscale Research Letters , 2009,
Abstract: Electrostatic self-assembly was used to fabricate new smart multi-layer coatings, using a recombinant elastin-like polymer (ELP) and chitosan as the counterion macromolecule. The ELP was bioproduced, purified and its purity and expected molecular weight were assessed. Aggregate size measurements, obtained by light scattering of dissolved ELP, were performed as a function of temperature and pH to assess the smart properties of the polymer. The build-up of multi-layered films containing ELP and chitosan, using a layer-by-layer methodology, was followed by quartz-crystal microbalance with dissipation monitoring. Atomic force microscopy analysis permitted to demonstrate that the topography of the multi-layered films could respond to temperature. This work opens new possibilities for the use of ELPs in the fabrication of biodegradable smart coatings and films, offering new platforms in biotechnology and in the biomedical area.
Solar neutrino detection in a large volume double-phase liquid argon experiment
D. Franco,C. Giganti,P. Agnes,L. Agostino,B. Bottino,S. Davini,S. De Cecco,A. Fan,G. Fiorillo,C. Galbiati,A. M. Goretti,E. V. Hungerford,Al. Ianni,An. Ianni,C. Jollet,L. Marini,C. J. Martoff,A. Meregaglia,L. Pagani,M. Pallavicini,E. Pantic,A. Pocar,A. L. Renshaw,B. Rossi,N. Rossi,Y. Suvorov,G. Testera,A. Tonazzo,H. Wang,S. Zavatarelli
Physics , 2015,
Abstract: The direct search for dark matter WIMP particles through their interaction with nuclei at the "neutrino floor" sensitivity, where neutrino-induced coherent scattering on nuclei starts contributing to the background, requires detectors capable of collecting exposures of the order of 1~ktonne yr free of background resulting from beta and gamma decays and cosmogenic and radiogenic neutrons. The same constraints are required for precision measurements of solar neutrinos elastically scattering on electrons. Two-phase liquid argon time projection chambers (LAr TPCs) are prime candidates for the ambitious program to explore the nature of dark matter. The large target, high scintillation light yield and good spatial resolution in all three cartesian directions concurrently allows a high precision measurement of solar neutrino fluxes. We studied the cosmogenic and radiogenic backgrounds affecting solar neutrino detection in a 300 tonne (100 tonne fiducial) LAr TPC operating at LNGS depth (3,800 meters of water equivalent). Such a detector could measure the CNO neutrino rate with 5 sigma sensitivity, and significantly improve the precision of the 7Be and pep neutrino rates compared to the currently available results from the Borexino organic liquid scintillator detector. Measurements with ~2%, ~10% and ~15% precision for 7Be, pep, and CNO neutrinos, respectively, are possible.
Evidence For The Production Of Slow Antiprotonic Hydrogen In Vacuum
N. Zurlo,M. Amoretti,C. Amsler,G. Bonomi,C. Carraro,C. L. Cesar,M. Charlton,M. Doser,A. Fontana,R. Funakoshi,P. Genova,R. S. Hayano,L. V. Jorgensen,A. Kellerbauer,V. Lagomarsino,R. Landua,E. Lodi Rizzini,M. Macrì,N. Madsen,G. Manuzio,D. Mitchard,P. Montagna,L. G. Posada,H. Pruys,C. Regenfus,A. Rotondi,G. Testera,D. P. Van der Werf,A. Variola,L. Venturelli,Y. Yamazaki
Physics , 2007, DOI: 10.1103/PhysRevLett.97.153401
Abstract: We present evidence showing how antiprotonic hydrogen, the quasistable antiproton-proton (pbar-p) bound system, has been synthesized following the interaction of antiprotons with the hydrogen molecular ion (H2+) in a nested Penning trap environment. From a careful analysis of the spatial distributions of antiproton annihilation events, evidence is presented for antiprotonic hydrogen production with sub-eV kinetic energies in states around n=70, and with low angular momenta. The slow antiprotonic hydrogen may be studied using laser spectroscopic techniques.
Production of Slow Protonium in Vacuum
N. Zurlo,M. Amoretti,C. Amsler,G. Bonomi,C. Carraro,C. L. Cesar,M. Charlton,M. Doser,A. Fontana,R. Funakoshi,P. Genova,R. S. Hayano,L. V. Jorgensen,A. Kellerbauer,V. Lagomarsino,R. Landua,E. Lodi Rizzini,M. Macri',N. Madsen,G. Manuzio,D. Mitchard,P. Montagna,L. G. Posada,H. Pruys,C. Regenfus,A. Rotondi,G. Testera,D. P. Van der Werf,A. Variola,L. Venturelli,Y. Yamazaki
Physics , 2008, DOI: 10.1007/s10751-007-9529-0
Abstract: We describe how protonium, the quasi-stable antiproton-proton bound system, has been synthesized following the interaction of antiprotons with the molecular ion H$_2^+$ in a nested Penning trap environment. From a careful analysis of the spatial distributions of antiproton annihilation events in the ATHENA experiment, evidence is presented for protonium production with sub-eV kinetic energies in states around $n$ = 70, with low angular momenta. This work provides a new 2-body system for study using laser spectroscopic techniques.
Positron plasma diagnostics and temperature control for antihydrogen production
ATHENA Collaboration,M. Amoretti,C. Amsler,G. Bonomi,A. Bouchta,P. D. Bowe,C. Carraro,C. L. Cesar,M. Charlton,M. Doser,V. Filippini,A. Fontana,M. C. Fujiwara,R. Funakoshi,P. Genova,J. S. Hangst,R. S. Hayano,L. V. Jorgensen,V. Lagomarsino,R. Landua,D. Lindelof,E. Lodi Rizzini,M. Macri',N. Madsen,G. Manuzio,P. Montagna,H. Pruys,C. Regenfus,A. Rotondi,G. Testera,A. Variola,D. P. van der Werf
Physics , 2003, DOI: 10.1103/PhysRevLett.91.055001
Abstract: Production of antihydrogen atoms by mixing antiprotons with a cold, confined, positron plasma depends critically on parameters such as the plasma density and temperature. We discuss non-destructive measurements, based on a novel, real-time analysis of excited, low-order plasma modes, that provide comprehensive characterization of the positron plasma in the ATHENA antihydrogen apparatus. The plasma length, radius, density, and total particle number are obtained. Measurement and control of plasma temperature variations, and the application to antihydrogen production experiments are discussed.
Production of Cold Antihydrogen with ATHENA for Fundamental Studies
ATHENA Collaboration,A. Kellerbauer,M. Amoretti,C. Amsler,G. Bonomi,P. D. Bowe,C. Canali,C. Carraro,C. L. Cesar,M. Charlton,M. Doser,A. Fontana,M. C. Fujiwara,R. Funakoshi,P. Genova,J. S. Hangst,R. S. Hayano,I. Johnson,L. V. J?rgensen,V. Lagomarsino,R. Landua,E. Lodi Rizzini,M. Macrí,N. Madsen,G. Manuzio,D. Mitchard,P. Montagna,H. Pruys,C. Regenfus,A. Rotondi,G. Testera,A. Variola,L. Venturelli,D. P. van der Werf,Y. Yamazaki,N. Zurlo
Physics , 2004,
Abstract: Since the beginning of operations of the CERN Antiproton Decelerator in July 2000, the successful deceleration, storage and manipulation of antiprotons has led to remarkable progress in the production of antimatter. The ATHENA Collaboration were the first to create and detect cold antihydrogen in 2002, and we can today produce large enough amounts of antiatoms to study their properties as well as the parameters that govern their production rate.
ATHENA -- First Production of Cold Antihydrogen and Beyond
ATHENA Collaboration,A. Kellerbauer,M. Amoretti,C. Amsler,G. Bonomi,P. D. Bowe,C. Canali,C. Carraro,C. L. Cesar,M. Charlton,M. Doser,A. Fontana,M. C. Fujiwara,R. Funakoshi,P. Genova,J. S. Hangst,R. S. Hayano,I. Johnson,L. V. J?rgensen,V. Lagomarsino,R. Landua,E. Lodi Rizzini,M. Macrí,N. Madsen,G. Manuzio,D. Mitchard,P. Montagna,H. Pruys,C. Regenfus,A. Rotondi,G. Testera,A. Variola,L. Venturelli,D. P. van der Werf,Y. Yamazaki,N. Zurlo
Physics , 2004,
Abstract: Atomic systems of antiparticles are the laboratories of choice for tests of CPT symmetry with antimatter. The ATHENA experiment was the first to report the production of copious amounts of cold antihydrogen in 2002. This article reviews some of the insights that have since been gained concerning the antihydrogen production process as well as the external and internal properties of the produced anti-atoms. Furthermore, the implications of those results on future prospects of symmetry tests with antimatter are discussed.
Cold-Antimatter Physics
ATHENA Collaboration,M. Amoretti,C. Amsler,G. Bonomi,P. D. Bowe,C. Canali,C. Carraro,C. L. Cesar,M. Charlton,M. Doser,A. Fontana,M. C. Fujiwara,R. Funakoshi,P. Genova,J. S. Hangst,R. S. Hayano,I. Johnson,L. V. Jorgensen,A. Kellerbauer,V. Lagomarsino,R. Landua,E. Lodi Rizzini,M. Macri,N. Madsen,G. Manuzio,D. Mitchard,P. Montagna,H. Pruys,C. Regenfus,A. Rotondi,G. Testera,A. Variola,L. Venturelli,D. P. van der Werf,Y. Yamazaki,N. Zurlo
Physics , 2005,
Abstract: The CPT theorem and the Weak Equivalence Principle are foundational principles on which the standard description of the fundamental interactions is based. The validity of such basic principles should be tested using the largest possible sample of physical systems. Cold neutral antimatter (low-energy antihydrogen atoms) could be a tool for testing the CPT symmetry with high precision and for a direct measurement of the gravitational acceleration of antimatter. After several years of experimental efforts, the production of low-energy antihydrogen through the recombination of antiprotons and positrons is a well-established experimental reality. An overview of the ATHENA experiment at CERN will be given and the main experimental results on antihydrogen formation will be reviewed.
The First Cold Antihydrogen
M. C. Fujiwara,M. Amoretti,C. Amsler,G. Bonomi,A. Bouchta,P. D. Bowe,C. Carraro,C. L. Cesar,M. Charlton,M. Doser,V. Filippini,A. Fontana,R. Funakoshi,P. Genova,J. S. Hangst,R. S. Hayano,L. V. Jorgensen,V. Lagomarsino,R. Landua,D. Lindelof,E. Lodi Rizzini,M. Macri,N. Madsen,M. Marchesotti,P. Montagna,H. Pruys,C. Regenfus,P. Rielder,A. Rotondi,G. Testera,A. Variola,D. P. van der Werf
Physics , 2004, DOI: 10.1016/j.nima.2004.06.050
Abstract: Antihydrogen, the atomic bound state of an antiproton and a positron, was produced at low energy for the first time by the ATHENA experiment, marking an important first step for precision studies of atomic antimatter. This paper describes the first production and some subsequent developments.
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