Coordinate System
Mostrando 1-12 de 293 artigos, teses e dissertações.
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1. Radially Periodic Metasurface Lenses for Magnetic Field Collimation in Resonant Wireless Power Transfer Applications
Abstract In this paper, a new procedure and topology of magnetic metasurface lens are proposed for improving the performance of Resonant Wireless Power Transfer systems. Firstly, three subwave-length unit cells are optimized in order to get negative magnetic permeability in the same frequency, each one with a different refractive index, and they are experime
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2022
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2. A Precise Algorithm for Computing Sun Position on a Satellite
ABSTRACT: To meet the high precision sun tracking needs of a space deployable membrane solar concentrator and other equipment, an existing algorithm for accurately computing the sun position is improved. Firstly, compared with other theories, the VSOP (variation seculaires des orbits planetaires) 87 theory is selected and adopted to obtain the sun position i
J. Aerosp. Technol. Manag.. Publicado em: 26/08/2019
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3. Adaptive Filtration of Parameters of the UAV Movement Based on the TDOA-Measurement Sensor Networks
ABSTRACT: In modern conditions unmanned aerial vehicles (UAVs) generate new classes of threats, including their use for terrorist purposes. A feature of modern UAVs is the ability to perform sudden maneuvers and to keep the same position in the point in space. For the description of the UAV movement with various types of maneuver it is used a rectangular coo
J. Aerosp. Technol. Manag.. Publicado em: 26/08/2019
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4. Open legacy soil survey data in Brazil: geospatial data quality and how to improve it
ABSTRACT: Spatial soil data applications require sound geospatial data including coordinates and a coordinate reference system. However, when it comes to legacy soil data we frequently find them to be missing or incorrect. This paper assesses the quality of the geospatial data of legacy soil observations in Brazil, and evaluates geospatial data sources (surv
Sci. agric. (Piracicaba, Braz.). Publicado em: 01/07/2019
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5. Three-Dimensional Reciprocal Invisibility Cloak with Multilayered Structure
Abstract We investigate a three-dimensional (3D) reciprocal invisibility cloak with a multilayered structure based on coordinate transformation theory and complementary media. There has been considerable research on invisibility cloaks such as the external cloak, which requires complex “anti-objects”, and closed cloaks of different shapes, in which the o
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 19/06/2019
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6. Challenges in measuring angles between craniofacial structures
Abstract Objective: Three-dimensional (3D) angular measurements between craniofacial planes pose challenges to quantify maxillary and mandibular skeletal discrepancies in surgical treatment planning. This study aims to compare the reproducibility and reliability of two modules to measure angles between planes or lines in 3D virtual surface models. Methodol
J. Appl. Oral Sci.. Publicado em: 03/06/2019
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7. A Mathematical Model for Simulating Meteor Showers
RESUMO Neste trabalho, apresenta-se um modelo matemático que possibilita a simulação da trajetória de um meteoro como visto por um observador localizado em qualquer região na Terra. A estratégia de solução consiste em definir um novo sistema de coordenadas, denominado Sistema Radiante de Coordenadas, que é centrado no observador e tem seu eixo z ali
TEMA (São Carlos). Publicado em: 30/05/2019
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8. Ecological capability evaluation for afforestation and forest expansion using Geographic Information System (GIS) in management area of Caspian Sea
Abstract Ecological capability evaluation is referred to as evaluation of potential capability of land and determination of its natural land use. In this paper, ecological capability of Lille Basin in Lahijan was evaluated for afforestation and forest expansion using Geographical Information Systems (GIS). For this purpose, information layers (slope, elevati
An. Acad. Bras. Ciênc.. Publicado em: 18/10/2018
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9. Relationship between Coffee Leaf Analysis and Soil Chemical Analysis
ABSTRACT: Research focused on adequate nutrition of plants is essential in modern coffee production to increase yield and develop more efficient management strategies with greater environmental and economic sustainability. The objectives of this study were to establish critical and optimal levels of soil fertility properties for high yielding Arabica coffee
Rev. Bras. Ciênc. Solo. Publicado em: 07/06/2018
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10. Can whitening toothpastes maintain the optical stability of enamel over time?
Abstract Besides the effects on the health of individuals, cigarette smoking can also interfere with the appearance of their teeth. Objective: To evaluate the effect of cigarette smoking-toothbrushing-cycling (CSTC) with whitening toothpastes on the roughness and optical behavior of bovine enamel for eight weeks. Material and Methods: Thirty bovine dentin/
J. Appl. Oral Sci.. Publicado em: 01/02/2018
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11. Modification of a Constitutive Model in the Framework of a Multilaminate Method for Post-Liquefaction Sand
Abstract The estimation of the value and direction of post-liquefaction deformations is one of the most challenging issues in the modelling of liquefaction soil, due to the inherent and induced anisotropy. It is very important in the science of soil-constitutive models to present a simple and comprehensive model for the prediction of fabric anisotropy effect
Lat. Am. j. solids struct.. Publicado em: 2017-08
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12. Production of Additives with Antimicrobial Activity via Tandem Hydroformylation-amine Condensation of Soybean FAME Using an Ionic Liquid-Based Biphasic Catalytic System
A biphasic catalytic system based in the ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate was employed for tandem hydroformylation-amine condensation reactions of soybean FAME using HRhCO(PPh3)3 as the catalyst precursor and n-butylamine. Using a tenfold excess of the ligand PPh3, the presence of the ionic liquid increased the selectivity for imi
J. Braz. Chem. Soc.. Publicado em: 2016-02