1. YIG Matrix Based Multiband Magneto-Dielectric Cylindrical Resonator Antenna

Abstract A multiband magneto-dielectric resonator antenna with cylindrical geometry is proposed in this paper. The resonator is composed of yttrium iron garnet (YIG) with chemical composition Y3Fe2(FeO4)3. The final structure is built on a low-cost FR4 dielectric substrate. With only one resonator, the antenna is able to resonate in three distinct controlled

J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2021-06

2. Effects of Polycyclic Aromatic Hydrocarbon Pendant-Armed Ligands on the Catecholase Activity of Dinuclear Copper(II) Complexes

Herein, we present three new binuclear copper(II) complexes containing different polycyclic aromatic hydrocarbons, able to catalyze the oxidation of 3,5-di-tert-butylcathecol, a model substrate for catechol oxidase. The ligands and complexes were successful characterized in solid and solution states. The structure of C1 was determined by X-ray crystallograph

J. Braz. Chem. Soc.. Publicado em: 2021-05

3. Bandwidth Enhancement of Microstrip Patch Antenna Using Metasurface

Abstract In this article, bandwidth enhancement of a microstrip patch antenna using a new kind of metasurface is discussed. This new geometry is used to generate new resonances in antenna and with an optimal position of the metasurface in relation to antenna we can overlap the resonances and obtain a large bandwidth. The proposed antenna showed a bandwidth f

J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2021-03

4. NO Photorelease from a Ruthenium Complex Assisted by Formation of a Supramolecular Dimer

This work presents the NO release from compound [Ru(biq)2(H2O)(NO)](PF6)3 (biq = 2,2’-biquinoline) with visible light irradiation (λirrad = 660 nm), assisted by the low-absorbing photosensitizer [Ru(biq)2Cl2]. The structure of both compounds were characterized by means of ESI-MS (electrospray ionization mass spectrometry). The NO+ stretching, ν(NO) = 199

J. Braz. Chem. Soc.. Publicado em: 2020-11

5. Modeling the Resonant Behavior of Continuously Reconfigurable FSS Based on Four Arms Star Geometry

Abstract A modeling of the resonant behavior of a continuously reconfigurable frequency selective surface, FSS, is described in this paper. The FSS is based on four arms star geometry and its reconfigurability is achieved by the use of varactors. FSS, four arms star geometry and varactor principles are explained. Considering available a set of measured or nu

J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2020-09

6. Compact Ultra-Wide-Band HI Monopole Antenna Loaded with C-Shaped Parasitic Elements for DVB-T and LTE Applications

Abstract In this work, a compact ultra-wide-band microstrip antenna loaded with C-shaped parasitic elements, for Digital Video Broadcasting - Terrestrial (DVB-T) and LTE 450 / 700 signal reception, is designed and presented. The proposed antenna is named “HI Monopole”, and its geometry has been designed to be simple, lightweight, and compact. Fabrication

J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2020-09

7. A Novel Tri-bandpass Filter Side-coupled Square Ring Based

Abstract This work presents the design of a tri-bandpass filter based on the side-coupled square ring structure. The modeling is conceived from the classic approach of coupled transmission lines. The geometry consists of a square structure of electrical length equal to twice the wavelength of the main operating frequency, and the laterally coupled lines thro

J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2020-06

8. Synthesis and Mechanical Reconfiguration of Ground Plane Tilted Microstrip Antennas Based on Tetra-Circle Fractals

Abstract A synthesis procedure of a mechanically reconfigurable antenna based on tetra-circle fractal patch elements is presented, enabling to change both resonant frequencies and radiation pattern performance. The antenna geometry reconfiguration is implemented by tilting the ground plane of the microstrip antenna with respect to the fractal patch and subst

J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2020-06

9. Pesquisas em políticas de comunicação em contextos de crise

By way of Density Functional Theory (DFT)-based computational methods with commercially available software, the computational work of which about the molecular properties, the vibrational modes and vibrational frequencies of finasteride were accomplished for the first time. In order to gain a deeper and more thorough understanding of the molecular structure

Intercom, Rev. Bras. Ciênc. Comun.. Publicado em: 2020-05

10. VIBRATIONAL SPECTROSCOPIC INVESTIGATION AND MOLECULAR STRUCTURE OF A 5α-REDUCTASE INHIBITOR: FINASTERIDE

By way of Density Functional Theory (DFT)-based computational methods with commercially available software, the computational work of which about the molecular properties, the vibrational modes and vibrational frequencies of finasteride were accomplished for the first time. In order to gain a deeper and more thorough understanding of the molecular structure

Quím. Nova. Publicado em: 2020-05

11. In-service Secondary Teachers' Teaching Approaches and Views Towards Integrating Ethnomathematics Approaches into Geometry Teaching

Resumen La enseñanza y el aprendizaje de la geometría deben reflejar e incluir la diversidad social que integra el aprendizaje de la geometría en el contexto de un mundo cada vez más conectado. Por esa razón, enfoques etnomatemáticos que vinculan la enseñanza y aprendizaje de la geometría con las experiencias culturales y los antecedentes de los alum

Bolema. Publicado em: 2020-04

12. A MULTIPLE CRITERIA ANALYSIS OF FACTORS INFLUENCING SURFACE ROUGHNESS OF WOOD AND WOOD-BASED MATERIALS IN THE PLANING PROCESS

ABSTRACT This paper presents a study of the fuzzy analytical hierarchy process (FAHP) for the prioritization of factors having important effects on the surface roughness of wood and wood-based materials in the planing process. Firstly, a three-level hierarchical model was devised. Secondly, the FAHP method was employed to determine the weights of the factor

CERNE. Publicado em: 2020-03