Coupled Modes
Mostrando 1-12 de 100 artigos, teses e dissertações.
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1. Uma proposta experimental para o estudo de oscilações acopladas usando um simulador de propagação de ondas mecânicas em meios sólidos
Resumo Neste artigo, apresentamos inicialmente um aparato, construído com materiais de fácil acesso, que pode ser empregado no estudo da lei de Hooke utilizando-se anéis de garrafa PET. Nesta fase da experimentação, esperamos que o professor reconheça junto aos seus estudantes que um anel mais largo possui constante elástica maior do que outro mais es
Rev. Bras. Ensino Fís.. Publicado em: 10/01/2020
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2. GC–MS and LC–MS/MS workflows for the identification and quantitation of pyrrolizidine alkaloids in plant extracts, a case study: Echium plantagineum
Abstract Workflows based on gas and liquid chromatography coupled to mass spectrometry for the identification of toxic pyrrolizidine alkaloids present in plants were developed and applied to Echium plantagineum L., Boraginaceae, extracts. GC–MS based determinations need reduction and derivatization steps prior to MS analysis, which is performed using a Ful
Rev. bras. farmacogn.. Publicado em: 17/10/2019
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3. Compact Broadband High-Directivity Microstrip Directional Coupler
Abstract The difference between phase velocities of the odd and even modes in inhomogeneous microstrip coupled lines makes the microstrip directional coupler a poor device regarding directivity. In this work, this issue is successfully compensated by the addition of a matching network at the ports of coupled lines. Furthermore, the proposed matching network,
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 19/06/2019
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4. ANALYSIS OF THE TARGET DECOMPOSITION TECHNIQUE ATTRIBUTES AND POLARIMETRIC RATIOS TO DISCRIMINATE LAND USE AND LAND COVER CLASSES OF THE TAPAJÓS REGION
Resumo Este trabalho tem como objetivo analisar a capacidade dos atributos das técnicas de decomposição de alvos e dos atributos de retroespalhamento, provenientes das imagens polarimétricas do satélite ALOS/PALSAR-2, para discriminar as classes de uso e cobertura da terra na região da Floresta Nacional do Tapajós (FNT), estado do Pará. Três imagens
Bol. Ciênc. Geod.. Publicado em: 18/04/2019
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5. Theoretical Study of Plasmonically Induced Transparency Effect in Arrays of Graphene-Based Double Disk Resonators
Abstract In this paper, we consider coupled disk-shaped resonators separated by a thin dielectric substrate that can be used as frequency-tunable filters or as electromagnetic switches in the terahertz frequency band. The two disks are electromagnetically coupled and resonate with dipole plasmonic modes. By using a Temporal Coupled-Mode Theory based approach
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2019-03
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6. Fit-for-Purpose ICP-MS Procedure Supporting Brazilian Regulations on Inorganic Constituents in Fresh and Saline Waters
This work aimed the development of an analytical procedure using inductively coupled plasma mass spectrometry (ICP-MS) in four modes of operation for simple and fast determination of Al, Ag, As, B, Ba, Be, Ca, Cd, Co, Cr, Cu, Fe, Li, Mg, Mn, Na, Ni, Pb, Sb, Se, Tl, Hg, V, U, and Zn in fresh and sea water samples attending simultaneously four Brazilian regula
J. Braz. Chem. Soc.. Publicado em: 2018-07
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7. Dependence of E-H transition in argon ICP discharges for treatment of organic molecules
ABSTRACT Plasma surface cleaning is an alternative process that aims at the fully removal of organic contaminants on several kinds of materials. Despite its advantages, there are still lacks on the comprehension of the complex relations between plasma-generated species and organic molecules during plasma cleaning. In the present work, a linear alkane (hexatr
Matéria (Rio J.). Publicado em: 08/01/2018
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8. Negociaciones en familia: género, trabajo y cuidado en Chile
Abstract: Women’s entry into the labor market and important changes in family configurations have undermined the traditional organization of families, based on male providers and female caregivers. However, recent research suggests that this has not meant the end of these traditional, gendered patterns. This paper seeks to contribute to the understanding o
Rev. Estud. Fem.. Publicado em: 2017-08
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9. Numerical Study of Vibro-Acoustic Responses of Un-Baffled Multi-Layered Composite Structure under Various End Conditions and Experimental Validation
Abstract This article presents the vibro-acoustic modeling and analysis of un-baffled laminated composite flat panels subjected to harmonic point load under various support conditions. The frequency values of the panel are obtained by using simulation model through the commercial finite element package (ANSYS) via batch input technique. Initially, the rate o
Lat. Am. j. solids struct.. Publicado em: 2017-08
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10. The search for novel insecticide targets in the post-genomics era, with a specific focus on G-protein coupled receptors
Insects are considered pests globally, implicated in the destruction of agricultural fields and transmission of pathogens that cause deadly human diseases, such as dengue, Zika and malaria. The diversity of the insecticide arsenal has remained stagnant for decades, but the recent rise of insecticide resistance fueled the discovery of novel modes of action, a
Mem. Inst. Oswaldo Cruz. Publicado em: 2017-01
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11. Evaluation of Standard API Casing Connections and Parametric API Buttress Improvement by Finite Element Analysis
Threaded and coupled connections generally present a non-uniform stress distribution, which is related to the higher stiffness of the box when compared to the pin. The non-uniform stress distribution can contribute to fatigue cracks and other failure modes in high pressure oil wells. An API 5CT P110 steel obtained from a seamless pipe was mechanically charac
Mat. Res.. Publicado em: 08/12/2016
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12. Axial Static Load Dependence Free Vibration Analysis of Helical Springs Based on the Theory of Spatially Curved Bars
Abstract This work addresses an accurate and detailed axial static load dependence linearly elastic free vibration analysis of cylindrical helical springs based on the theory of spatially curved bars and the transfer matrix method. For a continuous system, governing equations comprise coupled vibration modes namely transverse vibrations in two orthogonal pla
Lat. Am. j. solids struct.. Publicado em: 2016-12