What problems do trees face in your city? How can these problems be solved?

General Atomics (GA) is currently under turn-key contract to construct a Stationary Neutron Radiography System (SNRS) at McClellan Air Force Base, Sacramento, California. The SNRS is a custom designed neutron radiography inspection system, see Fig. 1, which utilizes a 1000 kW TRIGA reactor as a neutron source to inspect aircraft components for corrosion and other defects. The SNRS project is made up of four major systems: the Shielding and Containment System (SCS); TRIGA Reactor System (TRS); Neutron Beam System (NBS); and Component Inspection System (CIS). The SNRS project is currently close to completion with the construction phase completed and the equipment installation and testing phase well underway

Cambios en la superficie de áreas verdes urbanas en dos alcaldías de la Ciudad de México entre 1990-2015

ABSTRACT: The urban green areas (AVU) have a fundamental role in urban sustainability due to the diverse environmental and social benefits that they provide, that is why every city that pretends to be modern, safe, inclusive and sustainable must guarantee the access and availability of these spaces for its inhabitants (Procuraduria Ambiental y de Ordenamiento Territorial, 2010). Mexico City is promoted as a city in transit to sustainability, which is why it has launched various plans and actions focused on environmental care, including the AVU. Due to this, the main objective of this study was to compare, using geographic information systems (GIS) and population censuses of INEGI (National Institute of Statistics and Geography), the area of AVU existing in two city halls of the city between 1990 and 2015 The INEGI information was used to know the social situation of each mayor's office on the study dates. The results show that, although social gaps have decreased in this period, there are large differences in the surface and quality of AVU between both municipalities, so the goal of being an environmentally sustainable city is not yet met in the CDMX.RESUMEN: Las áreas verdes urbanas (AVU) tienen un papel fundamental en la sostenibilidad urbana debido a los diversos beneficios ambientales y sociales que prestan, es por ello que toda ciudad que pretenda ser moderna, segura, incluyente y sustentable debe garantizar el acceso y disponibilidad de estos espacios para sus habitantes (Procuraduria Ambiental y de Ordenamiento Territorial, 2010). La ciudad de México se promueve como una ciudad en tránsito a la sostenibilidad por lo que ha puesto en marcha distintos planes y acciones enfocados al cuidado ambiental, dentro de los que se encuentran las AVU. Debido a esto, el presente trabajo tuvo como objetivo principal comparar, usando sistemas de información geográfica (SIG) y censos poblacionales de INEGI (Instituto Nacional de Estadística y Geografía), la superficie de AVU existentes en dos alcaldías de la ciudad entre 1990 y 2015. La información de INEGI se utilizó para conocer la situación social de cada alcaldía en las fechas de estudio. Los resultados muestran que, si bien, las brechas sociales han disminuido en este periodo, existen grandes diferencias en la superficie y calidad de AVU entre ambas alcaldías, por lo que el objetivo de ser una ciudad ambientalmente sustentable aún no se cumple en la CDMX