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Mostrando 25-36 de 165 artigos, teses e dissertações.
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25. Microstrip Hybrid Coupler with a Wide Stop-Band Using Symmetric Structure for Wireless Applications
Abstract In this paper, a wide stop-band microstrip coupler is presented. The proposed structure consists of coupled lines and step impedance cells, which are integrated to operate at 2.82 GHz for wireless applications. This coupler is formed by a symmetric structure so that the locations of the output ports relative to input are quite similar. Accordingly,
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2018-03
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26. Dual-Port Dual-Wideband Annular Slot Antenna with Stable Unidirectional Pattern
Abstract This article describes the design of a dual-wideband annular slot antenna. The proposed structure has been optimized to operate in the typical bands of mobile communication systems (0.824-0.960 GHz and 1.710-2.165 GHz). The antenna is designed considering two independent ports with high isolation, one for each operation band, yielding an antenna tha
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2018-03
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27. Robotic assisted laparoscopic excision of a retroperitoneal Ganglioneuroma
ABSTRACT Introduction: Ganglioneuromas are rare benign neoplasms of the sympathetic nervous system. We describe the case of an incidentally found ganglioneuroma in a woman. To our knowledge this is the first described case of robotic excision of a retroperitoneal ganglioneuroma. Case: A 41-year-old female had an incidental retroperitoneal mass found during
Int. braz j urol.. Publicado em: 2017-10
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28. A Balanced-to-Single-Ended Wilkinson Power Divider
Abstract A balanced-to-single-ended (BTSE) Wilkinson power divider of planar microstrip structure is proposed in this paper. It has a balanced input and two single-ended outputs. Cascade of a balun and a conventional power divider can be replaced by this proposed structure. Based on the theory of mixed-mode S parameters and the admittance matrix method, the
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-09
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29. Feasibility of Robot - assisted Segmental Ureterectomy and Ureteroureterostomy in Patient with High Medical Comorbidity
ABSTRACT Introduction and objectives Nephroureterectomy remains the gold standard treatment option for upper tract tumors. However, segmental ureterectomy may be another option in patients with single kidney, borderline renal function or high medical comorbidities. The aim of this video is to assess the feasibility of robotic surgery as a minimally invasiv
Int. braz j urol.. Publicado em: 2017-08
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30. Fiscal strategic interaction in Brazil: An analysis of Fiscal War of Ports
O objetivo deste trabalho é avaliar a eventual interação competitiva entre os estados brasileiros, a Guerra Fiscal de Portos (FWP) e verificar se a Resolução 13/2012, que reduziu a alíquota sobre bens importados nas vendas interestaduais, teve o impacto desejado. Usando dados mensais sobre os níveis de importação do estado no período de janeiro de
Rev. Bras. Econ.. Publicado em: 2017-06
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31. Comparative study of pain in women submitted to conventional laparoscopic cholecystectomy versus single-port laparoscopic cholecystectomy
Abstract Purpose: To evaluate postoperative pain in patients submitted to conventional laparoscopic cholecystectomy with four ports versus single-port laparoscopic cholecystectomy with only one port. Methods: Twenty-one patients were included in the conventional laparoscopic cholecystectomy group and 19 other patients in the single-port laparoscopic cholec
Acta Cir. Bras.. Publicado em: 2017-06
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32. Substrate Integrated Waveguide (SIW) Bandpass Filter with Novel Microstrip-CPW-SIW Input Coupling
Abstract A Substrate integrated waveguide bandpass filter is presented with a novel CPW-to-SIW transition at both the input and output ports which also served as the input and output couplings into the filter. The CPW-to-SIW transition structures presented here exploited the step impedance between the 50 ohms input/output feedline and the transition to contr
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-04
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33. Triterpenoides, fenólicos e efeito fitotóxico das folhas de Eugenia flavescens DC (Myrtaceae)
This research deals with the chemical study and evaluation of the phytotoxic effects of the methanol extract of E. flavescens leaves. The compounds were isolated using classic chromatographic techniques and the identification of the phenolic profile was proposed from the HPLC/DAD/MS-MS data. Structure elucidation of the compounds was performed by 1H and 13C
Quím. Nova. Publicado em: 2017-04
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34. Distribution and Sources of Aliphatic and Polycyclic Aromatic Hydrocarbons in Surface Sediments of Itajaí-Açu Estuarine System in Brazil
The Itajaí-Açu estuarine system, located in southern Brazil, has great economic importance due to the presence of two ports (Itajaí and Navegantes). This system is affected by industrial and dredging activities, which can cause the remobilization of pollutants accumulated over time in the sediment. In this context, hydrocarbons were assessed in twelve sur
J. Braz. Chem. Soc.. Publicado em: 2017-04
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35. A New Simplified Approach for Design of Dual-Band Wilkinson Power Divider with Two and Three Transmission Line Sections Using Only Even-Mode Analysis
Abstract In this paper, design of dual-band equal-split Wilkinson power divider (WPD) with two and three transmission line (TL) sections is tackled from the perspective of a new simplified mathematical approach as compared to the previously presented work. It is mathematically proven and experimentally verified that only even-mode circuit analysis suffices f
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2016-12
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36. Invading the natural marine substrates: a case study with invertebrates in South Brazil
ABSTRACT The number of biological invasions has grown dramatically in recent decades, as well as the world's human population and coastal development. Anthropogenic habitats, such as pier pilings and break waters, have been constantly added to marine environment, usually concentrated in estuarine areas. These habitats are focal points for marine invasions, b
Zoologia (Curitiba). Publicado em: 20/06/2016