Characterization and Test of a Data Acquisition System for PET

A small Positron Emission Tomography demonstrator based on LYSO slabs and Silicon Photomultiplier matrices is under construction at the University and INFN of Pisa. In this paper we present the characterization results of the read-out electronics and of the detection system. Two SiPM matrices, composed by 8 × 8 SiPM pixels, 1.5 mm pitch, have been coupled one to one to a LYSO crystals array. Custom Front-End ASICs were used to read the 64 channels of each matrix. Data from each Front-End were multiplexed and sent to a DAQ board for the digital conversion; a motherboard collects the data and communicates with a host computer through a USB port. Specific tests were carried out on the system in order to assess its performance. Futhermore we have measured some of the most important parameters of the system for PET application.

Dissolved organic carbon in sediments of the central Arctic Ocean collected during POLARSTERN cruise ARK-XXVII/3 from August-September 2012

Marine organic matter (OM) sinks from surface waters to the seafloor via the biological pump. Benthic communities, which use this sedimented OM as energy and carbon source, produce dissolved organic matter (DOM) in the process of remineralization, enriching the sediment porewater with fresh DOM compounds. We hypothesized that in the oligotrophic deep Arctic basin the molecular signal of freshly deposited primary produced OM is restricted to the surface sediment pore waters which should differ from bottom water and deeper sediment pore water in DOM composition. This study focused on: 1) the molecular composition of the DOM in sediment pore waters of the deep Eurasian Arctic basins, 2) whether the signal of marine vs. terrigenous DOM is represented by different compounds preserved in the sediment pore waters and 3) whether there is any relation between Arctic Ocean ice cover and DOM composition. Molecular data, obtained via 15 Tesla Fourier transform ion cyclotron resonance mass spectrometer, were correlated with environmental parameters by partial least square analysis. The fresher marine detrital OM signal from surface waters was limited to pore waters from < 5 cm sediment depth. The productive ice margin stations showed higher abundances of peptides, unsaturated aliphatics and saturated fatty acids formulae, indicative of fresh OM/pigments deposition, compared to northernmost stations which had stronger aromatic signals. This study contributes to the understanding of the coupling between the Arctic Ocean productivity and its depositional regime, and how it will be altered in response to sea ice retreat and increasing river runoff.

Join the Union and Be Safe : The Effects of Unionization on Occupational Safety and Health in the European Union

Acknowledgements: Thanks go to the participants of the ‘Health and Work’ Organised Session (2011) of the Scottish Economic Society 2011 Annual Conference, Perth, Scotland, for helpful comments. The authors are also grateful to the editor Franco Peracchi and the referees of this journal for helpful comments and suggestions. The financial support of the European Commission is gratefully acknowledged (HEALTHatWORK Project) — 7th Framework Programme THEME [HEALTH-2007-4.2-3] Grant Agreement No: 200716.

Join the Union and Be Safe : The Effects of Unionization on Occupational Safety and Health in the European Union

Acknowledgements: Thanks go to the participants of the ‘Health and Work’ Organised Session (2011) of the Scottish Economic Society 2011 Annual Conference, Perth, Scotland, for helpful comments. The authors are also grateful to the editor Franco Peracchi and the referees of this journal for helpful comments and suggestions. The financial support of the European Commission is gratefully acknowledged (HEALTHatWORK Project) — 7th Framework Programme THEME [HEALTH-2007-4.2-3] Grant Agreement No: 200716.

The Excess Burden of Cytomegalovirus in African American Communities: A Geospatial Analysis.

Background.  Cytomegalovirus (CMV) is a common cause of birth defects and hearing loss in infants and opportunistic infections in the immunocompromised. Previous studies have found higher CMV seroprevalence rates among minorities and among persons with lower socioeconomic status. No studies have investigated the geographic distribution of CMV and its relationship to age, race, and poverty in the community. Methods.  We identified patients from 6 North Carolina counties who were tested in the Duke University Health System for CMV immunoglobulin G. We performed spatial statistical analyses to analyze the distributions of seropositive and seronegative individuals. Results.  Of 1884 subjects, 90% were either white or African American. Cytomegalovirus seropositivity was significantly more common among African Americans (73% vs 42%; odds ratio, 3.31; 95% confidence interval, 2.7-4.1), and this disparity persisted across the life span. We identified clusters of high and low CMV odds, both of which were largely explained by race. Clusters of high CMV odds were found in communities with high proportions of African Americans. Conclusions.  Cytomegalovirus seropositivity is geographically clustered, and its distribution is strongly determined by a community's racial composition. African American communities have high prevalence rates of CMV infection, and there may be a disparate burden of CMV-associated morbidity in these communities.

Plantar a cidade

Dissertação para obtenção do grau de Mestre em Arquitectura, apresentada na Universidade de Lisboa - Faculdade de Arquitetura.

Herramientas de planificación estratégica (III): Mapa estratégico (componentes y construcción)

Contiene los componentes básicos para la construcción de un mapa estratégico (objetivos estratégicos, perspectivas y relaciones causa-efecto)

Calcolo del flusso di raggi-γ del Blazar PKS B1424-418

Lo scopo di questo lavoro è quello di analizzare i dati raccolti dal Large Area Telescope a bordo del satellite Fermi con l'obiettivo di ricavare il flusso di raggi-γ, di energia compresa tra 100 MeV e 300 GeV, prodotti dal Blazar PKS B1424-418 in un periodo compreso tra l'1 Gennaio 2012 e il 4 Settembre 2016. Secondo alcuni modelli questo blazar potrebbe essere infatti la prima sorgente di Ultra High Energy Cosmic Ray associata sperimentalmente all'emissione di neutrini. L'analisi dei dati è effettuata tramite il pacchetto di software Fermi Science Tools.

Conflictos ambientales en Colombia. Retos y perspectivas desde el enfoque de DDHH y la participación ciudadana.

Conflictos ambientales en Colombia. Retos y perspectivas desde el enfoque de DDHH y la participación ciudadana se articula en tres partes: en la primera se realiza un panorama de conflictos ambientales en las diferentes regiones naturales del país desde la perspectiva de la participación ciudadana. En la segunda se exponen las diferentes reflexiones de las autoridades ambientales locales y de las organizaciones sociales sobre los conflictos ambientales desde el enfoque de los derechos humanos. En la tercera, se hace un análisis de las competencias de las autoridades ambientales en torno al derecho a la participación cuando se presentan conflictos ambientales desde el enfoque de los derechos humanos. Dada la complejidad de los conflictos ambientales que tienen las diversas regiones del país y sus repercusiones ambientales y sociales,\' es necesario\' promover esfuerzos conjuntos con las universidades, los institutos, las organizaciones sociales y las autoridades ambientales realizando encuentros y generando reflexiones conjuntas acerca de los desafíos, retos y oportunidades en búsqueda de resolución civilista de los mismos. Por ello se espera que esta publicación logre constituirse en una herramienta de trabajo concreta que sirva de guía a las autoridades ambientales, las organizaciones sociales y la ciudadanía para abordar, entender y resolver los grandes desafíos que se tienen que afrontar cotidianamente en el país.En la segunda se exponen las diferentes reflexiones de las autoridades ambientales locales y de las organizaciones sociales sobre los conflictos ambientales desde el enfoque de los derechos humanos. En la tercera, se hace un análisis de las competencias de las autoridades ambientales en torno al derecho a la participación cuando se presentan conflictos ambientales desde el enfoque de los derechos humanos. Dada la complejidad de los conflictos ambientales que tienen las diversas regiones del país y sus repercusiones ambientales y sociales,\' es necesario\' promover esfuerzos conjuntos con las universidades, los institutos, las organizaciones sociales y las autoridades ambientales realizando encuentros y generando reflexiones conjuntas acerca de los desafíos, retos y oportunidades en búsqueda de resolución civilista de los mismos. Por ello se espera que esta publicación logre constituirse en una herramienta de trabajo concreta que sirva de guía a las autoridades ambientales, las organizaciones sociales y la ciudadanía para abordar, entender y resolver los grandes desafíos que se tienen que afrontar cotidianamente en el país.Dada la complejidad de los conflictos ambientales que tienen las diversas regiones del país y sus repercusiones ambientales y sociales,\' es necesario\' promover esfuerzos conjuntos con las universidades, los institutos, las organizaciones sociales y las autoridades ambientales realizando encuentros y generando reflexiones conjuntas acerca de los desafíos, retos y oportunidades en búsqueda de resolución civilista de los mismos. Por ello se espera que esta publicación logre constituirse en una herramienta de trabajo concreta que sirva de guía a las autoridades ambientales, las organizaciones sociales y la ciudadanía para abordar, entender y resolver los grandes desafíos que se tienen que afrontar cotidianamente en el país.