73 research outputs found
Yeso reciclado con residuos de poliestireno expandido y fibra de celulosa para mejorar las propiedades térmicas del yeso
In this study, different proportions of gypsum composite reinforced with recycled cellulose fibers and expanded polystyrene were produced to study the properties of thermal conductivity, density, and flexural strength to be used as sealing plates to improve the thermal comfort of buildings. Different gypsum matrix composites were produced with varied proportions of cellulose fiber and expanded polystyrene, to analyze the influence of residues on the properties of the material. The thermal conductivity obtained for composites with greater amounts of expanded polystyrene was 0.18 W/mK, a 48% reduction in relation to plasterboard, improving thermal performance. The flexural strength was also analyzed, which met the minimum strength requirement for use as gypsum composites, however, it is not enough to be used in places that require mechanical resistance, thus it is indicated for sealing plates applications, improving the thermal performance of places where only plasterboard is used.En este estudio, se produjeron diferentes proporciones de compuesto de yeso reforzado con fibras de celulosa recicladas y poliestireno expandido para estudiar las propiedades de conductividad térmica, densidad y resistencia a la flexión. Se produjeron diferentes composites de matriz de yeso con variadas proporciones de fibra de celulosa y poliestireno expandido, para analizar la influencia de los residuos en las propiedades del material. La conductividad térmica obtenida para los composites con mayores cantidades de poliestireno expandido fue de 0,18 W/mK, una reducción del 48% con relación a las placas de yeso, mejorando el rendimiento térmico. También se analizó la resistencia a la flexión, la cual cumplió con el requisito de resistencia mÃnima para su uso como compuestos de yeso, sin embargo, no es suficiente para ser utilizado en lugares que requieran resistencia mecánica, por lo que está indicado para aplicaciones de placas de sellado, mejorando el rendimiento térmico de los lugares donde solo se utiliza placa de yeso
Energy Resolution studies for NEXT
This work aims to present the current state of simulations of
electroluminescence (EL) produced in gas-based detectors with special interest
for NEXT --- Neutrino Experiment with a Xenon TPC. NEXT is a neutrinoless
double beta decay experiment, thus needs outstanding energy resolution which
can be achieved by using electroluminescence. The process of light production
is reviewed and properties such as EL yield and associated fluctuations,
excitation and electroluminescence efficiencies, and energy resolution, are
calculated. An EL production region with a 5 mm width gap between two infinite
parallel planes is considered, where a uniform electric field is produced. The
pressure and temperature considered are 10 bar and 293 K, respectively. The
results show that, even for low values of VUV photon detection efficiency, good
energy resolution can be achieved: below 0.4 % (FWHM) at 2.458
MeV
A simulation toolkit for electroluminescence assessment in rare event experiments
A good understanding of electroluminescence is a prerequisite when optimising
double-phase noble gas detectors for Dark Matter searches and high-pressure
xenon TPCs for neutrinoless double beta decay detection.
A simulation toolkit for calculating the emission of light through electron
impact on neon, argon, krypton and xenon has been developed using the Magboltz
and Garfield programs. Calculated excitation and electroluminescence
efficiencies, electroluminescence yield and associated statistical fluctuations
are presented as a function of electric field. Good agreement with experiment
and with Monte Carlo simulations has been obtained
ASSISTÊNCIA DE ENFERMAGEM A DOENTES COM ALTERAÇÕES NA ELIMINAÇÃO DA SECREÇÃO TRAQUEOBRÔNQUICA
Nitrogen fertilization strategies for xaraes and tifton 85 grasses irrigated in the dry season
Canopy structure, ingestive behavior and displacement patterns of beef heifers grazing warm-season pastures
Study of infrared scintillations in gaseous and liquid argon - Part II: light yield and possible applications
We present here a comprehensive study of the light yield of primary and
secondary scintillations produced in gaseous and liquid Ar in the near infrared
(NIR) and visible region, at cryogenic temperatures. The measurements were
performed using Geiger-mode avalanche photodiodes (GAPDs) and pulsed X-ray
irradiation. The primary scintillation yield of the fast emission component in
gaseous Ar was found to be independent of temperature in the range of 87-160 K;
it amounted to 17000+/-3000 photon/MeV in the NIR in the range of 690-1000 nm.
In liquid Ar at 87 K, the primary scintillation yield of the fast component was
considerably reduced, amounting to 510+/-90 photon/MeV, in the range of
400-1000 nm. Proportional NIR scintillations (electroluminescence) in gaseous
Ar were also observed; their amplification parameter at 160 K was measured to
be 13 photons per drifting electron per kV. No proportional scintillations were
observed in liquid Ar up to the electric fields of 30 kV/cm. The applications
of NIR scintillations in dark matter search and coherent neutrino-nucleus
scattering experiments and in ion beam radiotherapy are considered.Comment: 20 pages, 11 figures. Submitted to JINS
The Brazilian Developments On The Regional Atmospheric Modeling System (brams 5.2): An Integrated Environmental Model Tuned For Tropical Areas
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento CientÃfico e Tecnológico (CNPq)We present a new version of the Brazilian developments on the Regional Atmospheric Modeling System (BRAMS), in which different previous versions for weather, chemistry, and carbon cycle were unified in a single integrated modeling system software. This new version also has a new set of state-of-the-art physical parameterizations and greater computational parallel and memory usage efficiency. The description of the main model features includes several examples illustrating the quality of the transport scheme for scalars, radiative fluxes on surface, and model simulation of rainfall systems over South America at different spatial resolutions using a scale aware convective parameterization. Additionally, the simulation of the diurnal cycle of the convection and carbon dioxide concentration over the Amazon Basin, as well as carbon dioxide fluxes from biogenic processes over a large portion of South America, are shown. Atmospheric chemistry examples show the model performance in simulating near-surface carbon monoxide and ozone in the Amazon Basin and the megacity of Rio de Janeiro. For tracer transport and dispersion, the model capabilities to simulate the volcanic ash 3-D redistribution associated with the eruption of a Chilean volcano are demonstrated. The gain of computational efficiency is described in some detail. BRAMS has been applied for research and operational forecasting mainly in South America. Model results from the operational weather forecast of BRAMS on 5km grid spacing in the Center for Weather Forecasting and Climate Studies, INPE/Brazil, since 2013 are used to quantify the model skill of near-surface variables and rainfall. The scores show the reliability of BRAMS for the tropical and subtropical areas of South America. Requirements for keeping this modeling system competitive regarding both its functionalities and skills are discussed. Finally, we highlight the relevant contribution of this work to building a South American community of model developers. © Author(s) 2017.1011892222014/01563-1, FAPESP, Fundação de Amparo à Pesquisa do Estado de São Paulo2014/01564-8, FAPESP, Fundação de Amparo à Pesquisa do Estado de São Paulo2015/10206-0, FAPESP, Fundação de Amparo à Pesquisa do Estado de São Paulo306340/2011-9, Conselho Nacional de Desenvolvimento CientÃfico e TecnológicoFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento CientÃfico e Tecnológico (CNPq
Chemical composition and photosynthetically active radiation of forage grasses under irrigation
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