Microlensing path parametrization for Earth-like Exoplanet detection around solar mass stars

We propose a new parametrization of the impact parameter u0 and impact angle {\alpha} for microlensing systems composed by an Earth-like Exoplanet around a Solar mass Star at 1 AU. We present the caustic topology of such system, as well as the related light curves generated by using such a new parametrization. Based on the same density of points and accuracy of regular methods, we obtain results 5 times faster for discovering Earth-like exoplanet. In this big data revolution of photometric astronomy, our method will impact future missions like WFIRST (NASA) and Euclid (ESA) and they data pipelines, providing a rapid and deep detection of exoplanets for this specific class of microlensing event that might otherwise be lost.Comment: 8 pages, 7 figures, accepted to be published in The Astronomical Journa

Avaliação das características agronômicas de sete adubos verdes de inverno no município de Paty do Alferes(RJ).

Adubação verde. Cobertura do solo, produção e fitomassa e acúmulo de macronutrientes.bitstream/CNPAB-2010/27145/1/cot020.pd

Magnetic phases evolution in the LaMn1-xFexO3+y system

We have investigated the crystal structure and magnetic properties for polycrystalline samples of LaMn1-xFexO3+y, in the whole range x=0.0 to x=1.0, prepared by solid state reaction in air. All samples show the ORT-2 orthorhombic structure that suppresses the Jahn-Teller distortion, thus favoring a ferromagnetic (FM) superexchange (SE) interaction between Mn^{3+}-O-Mn^{3+}. For x=0.0 the oxygen excess (y ~ 0.09) produces vacancies in the La and Mn sites and generates a fraction around 18% of Mn^{4+} ions and 82% of the usual Mn^{3+} ions, with possible double exchange interaction between them. The Fe doping in this system is known to produce only stable Fe^{3+} ions. We find an evolution from a fairly strong FM phase with a Curie temperature T_{C} ~ 160 K, for x=0.0, to an antiferromagnetic (AFM) phase with T_{N} = 790 K, for x=1.0, accompanied by clear signatures of a cluster-glass behavior. For intermediate Fe contents a mixed-phase state occurs, with a gradual decrease (increase) of the FM (AFM) phase, accompanied by a systematic transition broadening for 0.2 < x < 0.7. A model based on the expected exchange interaction among the various magnetic-ion types, accounts very well for the saturation-magnetization dependence on Fe doping.Comment: 27 pages, 9 figure

Sistema integrado de produção agroecológica: uma experiência de pesquisa em agricultura orgânica.

O sistema integrado de produção agroecológica (SIPA). Alguns resultados de pesquisa no SIPA.bitstream/item/111699/1/CNPAB-Sistema-Integrado-de-Producao-Agroecologica-SIPA-DOC.-169-03.pd

Truncated states obtained by iteration

Quantum states of the electromagnetic field are of considerable importance, finding potential application in various areas of physics, as diverse as solid state physics, quantum communication and cosmology. In this paper we introduce the concept of truncated states obtained via iterative processes (TSI) and study its statistical features, making an analogy with dynamical systems theory (DST). As a specific example, we have studied TSI for the doubling and the logistic functions, which are standard functions in studying chaos. TSI for both the doubling and logistic functions exhibit certain similar patterns when their statistical features are compared from the point of view of DST. A general method to engineer TSI in the running-wave domain is employed, which includes the errors due to the nonidealities of detectors and photocounts.Comment: 10 pages, 22 figure

Influence of 3D microstructure for improving the thermal performance of building façades

The thermal performance of a building is highly dependent on the heat transmission through the envelope. On the other hand, additive manufacturing has been increasingly used in several industrial applications due to its possibility to produce complex structures. However, most studies of the 3d printing process focused on mechanical performance. This study aims to evaluate how the internal 3D-printed microstructure affects thermal performance. Twelve infill patterns were analysed, including Gyroid, Grid, Hilbert curve, Line, Rectilinear, Stars Triangles, 3D Honeycomb, Honeycomb, Concentric, Cubic, and Octagram spiral. Using fused deposition modelling (FDM), the samples were printed with polyethene terephthalate-glycol (PET-G) thermoplastic filaments. Thermal tests were conducted using a calibrated hotbox, following the recommendations of ASTM C1363-11:2014. The results obtained show a variation of 70% by changing the internal microstructure using fix infill density of 25%. Concentric, Gyroid and Hilbert curve achieved the best thermal insulation properties.The authors would like to acknowledge the financial support granted by NORTE-45-2020-75. The contribution of the work of Paulo Renato Quintas during the analysis and development of the analysed specimens, and the technical support of Prof. Ricardo Mateus, Adilson Junior and Lívia Cosentino during the hotbox experiments

Avaliação do consórcio de cenoura com alface em sistema orgânico de produção.

bitstream/CNPAB-2010/27142/1/cot017.pd

Qualidade de milho verde cultivado em sistemas de produção orgânico e convencional.

Avaliaram-se as características agronômicas e físico-químicas de milho verde cultivado em sistemas de produção orgânico e convencional. Utilizou-se o delineamento experimental inteiramente casualizado, em esquema fatorial 4 x 2, sendo quatro cultivares (AG 1051, BR 106, SWB 551 e VIVI), nos sistemas orgânico e convencional, com três repetições. As características agronômicas analisadas foram peso das espigas com palhas (PP) e despalhadas (PD), peso dos grãos (PG), peso do sabugo (PS), peso da palha (P), comprimento da espiga com palha (CE), percentual relativo de grãos (PRG), percentual relativo de palha (PRP) e percentual relativo de sabugo (PRS). Foram, ainda, analisados o teor de umidade e as características físico-químicas (pH, acidez titulável e sólidos solúveis totais) dos grãos verdes. As espigas produzidas no sistema convencional apresentaram PP, PD e PG superiores aos das espigas produzidas em sistema orgânico, para a cultivar AG 1051. O mesmo comportamento foi observado para o CE da cultivar SWB 551 e o PG da cultivar BR 106. No sistema convencional, a cultivar AG 1051 destacou-se nas características agronômicas avaliadas. Os valores médios de pH, diferentemente da acidez, foram superiores no cultivo orgânico. A cultivar SWB 551 apresentou maior percentual de sólidos solúveis entre as cultivares. Portanto, o sistema de produção influencia as principais características de qualidade do milho verde

Avaliação de substratos alternativos para produção de mudas de alface em bandejas.

bitstream/CNPAB-2010/27149/1/cot024.pd

Utilização de minhocas na estabilização de resíduos orgânicos: Vermicompostagem.

Criação das minhocas.bitstream/CNPAB-2010/27133/1/cot008.pdfed. rev. mod