LSST: from Science Drivers to Reference Design and Anticipated Data Products

(Abridged) We describe here the most ambitious survey currently planned in the optical, the Large Synoptic Survey Telescope (LSST). A vast array of science will be enabled by a single wide-deep-fast sky survey, and LSST will have unique survey capability in the faint time domain. The LSST design is driven by four main science themes: probing dark energy and dark matter, taking an inventory of the Solar System, exploring the transient optical sky, and mapping the Milky Way. LSST will be a wide-field ground-based system sited at Cerro Pach\'{o}n in northern Chile. The telescope will have an 8.4 m (6.5 m effective) primary mirror, a 9.6 deg$^2$ field of view, and a 3.2 Gigapixel camera. The standard observing sequence will consist of pairs of 15-second exposures in a given field, with two such visits in each pointing in a given night. With these repeats, the LSST system is capable of imaging about 10,000 square degrees of sky in a single filter in three nights. The typical 5$\sigma$ point-source depth in a single visit in $r$ will be $\sim 24.5$ (AB). The project is in the construction phase and will begin regular survey operations by 2022. The survey area will be contained within 30,000 deg$^2$ with $\delta<+34.5^\circ$, and will be imaged multiple times in six bands, $ugrizy$, covering the wavelength range 320--1050 nm. About 90\% of the observing time will be devoted to a deep-wide-fast survey mode which will uniformly observe a 18,000 deg$^2$ region about 800 times (summed over all six bands) during the anticipated 10 years of operations, and yield a coadded map to $r\sim27.5$. The remaining 10\% of the observing time will be allocated to projects such as a Very Deep and Fast time domain survey. The goal is to make LSST data products, including a relational database of about 32 trillion observations of 40 billion objects, available to the public and scientists around the world.Comment: 57 pages, 32 color figures, version with high-resolution figures available from https://www.lsst.org/overvie

Measurement invariance of the Childhood Autism Rating Scale (CARS) across six countries

Education and Child Studie

Revista del Museo Nacional N° 17

El Museo Nacional, dirigido por Luis E. Valcárcel desde 1931, publicó la Revista del Museo Nacional a partir del año 1932. El presente volumen N° XVII, fue publicado en 1948. Contenido: “Actividades del Museo de la Cultura Peruana” – “El rol de Nasca, Jaqui y Acarí en el Imperio de los Incas”, por Auza Arce, Carlos -- “Bibliográficas” – “Creación y Programa de la Comisión Panamericana de Historia” – “Colección de textos quechuas del Perú central (Continuación)”, por Farfán, J. M. B. – “Los Productos Textiles del Perú antiguo”, por Holmes, William H. – “Mate Peruano”, por Jiménez Borja, Arturo – “Fundamentos de la Lengua Kkechuwa ( Continuación)”, por Lira, Jorge A. – “Los Antropólogos y la actualidad mundial” – “El estudio del Indígena”, por Muelle, Jorge C. – “Necrologías” -- "El Ullaricuy", por Sabogal Wiesse, José R. -- “El Alimento en el Antiguo Perú”, por Valcárcel, Luis E

Catolicismo e trabalho feminino: uma abordagem a partir da imprensa da região sudoeste de Buenos Aires no início do século XX

O presente artigo analisa as representações de género sobre o trabalho feminino na imprensa católica em Bahía Blanca (Provincia de Buenos Aires, Argentina) e sua influência durante as primeiras três décadas do século XX. A hipotese é que os católicos partilham o conceito de diferença sexual dominante naquela época, e abordam o problema do trabalho das mulheres centrando-se em noções de maternidade e domesticidade frente a novos processos de modernização. Como resultado manifestam determinadas idéias que, mesmo não tendo a intenção de subverter relações de gênero, apoiam certas mutações da condição feminina no estatuto moderno da mulher