Slots
Mostrando 13-24 de 70 artigos, teses e dissertações.
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13. The study of the ground plane effect on a Multiband PIFA Antenna by using Genetic Algorithm and Particle Swarm Optimization
Abstract The ground plane plays an important role on the performance of a planar inverted-F antenna (PIFA). In this regard, the ground plane modification using slots is proposed in this research to obtain a dual band antenna for WiMAX application. Popular optimization techniques, as genetic algorithm (GA) and particle swarm optimization (PSO), were used to d
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2016-12
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14. Evaluation of the force generated by gradual deflection of orthodontic wires in conventional metallic, esthetic, and self-ligating brackets
ABSTRACT Objective: The purpose of this study was to evaluate the deflection forces of Nitinol orthodontic wires placed in different types of brackets: metallic, reinforced polycarbonate with metallic slots, sapphire, passive and active self-ligating, by assessing strength values variation according to gradual increase in wire diameter and deflection and co
J. Appl. Oral Sci.. Publicado em: 2016-10
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15. A New Triple Band Microstrip Fractal Antenna for C-band and S-band Applications
Abstract Recently research show that some parameters such as the shapes of antenna patch and the ground plane when geometrically altered produces changes in the current density distribution of the planar structure and consequently in the resonant modes. This paper presents a new microstrip fractal antenna using the technique of inserting slots of shape fract
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2016-09
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16. High malaria transmission in a forested malaria focus in French Guiana: How can exophagic Anopheles darlingi thwart vector control and prevention measures?
In French Guiana, malaria vector control and prevention relies on indoor residual spraying and distribution of long lasting insecticidal nets. These measures are based on solid epidemiological evidence but reveal a poor understanding of the vector. The current study investigated the behaviour of both vectors and humans in relation to the ongoing prevention s
Mem. Inst. Oswaldo Cruz. Publicado em: 2016-09
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17. Numerical Study of Wall Ventilation in a Transonic Wind Tunnel
ABSTRACT: Transonic wind tunnels (TWT) are sophisticated tools for the investigations of flows with Mach numbers of order one. The most characteristic feature of a facility such as this is, for sure, the openings in the walls of the test section. The openings in the walls permit the proper relief effect, and this, on the other hand, makes possible the experi
J. Aerosp. Technol. Manag.. Publicado em: 2015-03
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18. Study of different shape Electromagnetic Band Gap (EBG) structures for single and dual band applications
In this paper, single and dual band EBG structures for wider bandwidth are proposed. In each of the discussed EBGs, a metallic patch of regular geometry is chosen for the unit element. The patch is further modified by cutting slots to get extra inductance and capacitance which results into lower cut-off frequency and larger bandwidth. The proposed EBG struct
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2014-06
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19. Frictional resistance of self-ligating versus conventional brackets in different bracket-archwire-angle combinations
Objective: To compare the influence of archwire material (NiTi, beta-Ti and stainless steel) and brackets design (self-ligating and conventional) on the frictional force resistance. Material and Methods: Two types of brackets (self-ligating brackets - Smartclip, 3M/Unitek - and conventional brackets - Gemini, 3M/Unitek) with three (0, 5, and 10 degrees) s
J. Appl. Oral Sci.. Publicado em: 2014-06
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20. A alocação de slots e a concorrência no setor de transporte aéreo
Este trabalho analisa o histórico regulatório do setor de aviação civil e o controle estatal exercido por meio de políticas regulatórias ao longo das décadas. Avalia, no contexto atual, o acesso à infraestrutura necessária para a prestação do serviço de transporte aéreo e suas barreiras à entrada, notadamente as normas para distribuição de sl
J. Transp. Lit.. Publicado em: 2014-01
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21. An improved zeroth order resonator using left handed metamaterial
In this paper an improved version of zeroth order resonator (ZOR) using Left Handed Metamaterial (LHM) is reported, and its performance is compared with the earlier published ZOR. The resonator is designed based on microstrip technology using composite right left handed transmission line (CRLH TL) approach. The conventional ZOR is designed based on the CRLH
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-06
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22. Assessment of the dimensions and surface characteristics of orthodontic wires and bracket slots
OBJETIVO: o objetivo desse estudo é avaliar as dimensões e as características superficiais de fios retangulares e slots de braquetes de diferentes marcas comerciais. MÉTODOS: trinta braquetes metálicos (0,022" x 0,028" e 0,022" x 0,030") foram divididos em três grupos: Grupo DYN/3M = Dyna-Lock, 3M/Unitek, aço inoxidável (AI); Grupo STD/MO = Slim More
Dental Press J. Orthod.. Publicado em: 2013-04
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23. Interferência dos artefatos de imagem causados por acessórios ortodônticos metálicos em sobreposições de imagens de TCFC / Influence of streaking artifacts due to metallic orthodontic accessories in CBCT 3D model superimposition
The aim of this study was to determine whether the artifacts caused by orthodontic metallic accessories interfere with the accuracy of three-dimensional (3D) Cone Beam Computed Tomography (CBCT) model superimposition. Ten dry human skulls were subjected to 3 CBCT scans: without orthodontic brackets (T1), with stainless steel brackets bonded (T2) and with ort
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/07/2012
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24. Hausdorff Distance evaluation of orthodontic accessories' streaking artifacts in 3D model superimposition
The aim of this study was to determine whether image artifacts caused by orthodontic metal accessories interfere with the accuracy of 3D CBCT model superimposition. A human dry skull was subjected three times to a CBCT scan: at first without orthodontic brackets (T1), then with stainless steel brackets bonded without (T2) and with orthodontic arch wires (T3)
Braz. oral res.. Publicado em: 2012-10