Matrix Transformation
Mostrando 1-12 de 194 artigos, teses e dissertações.
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1. Design and Implementation of Microwave Dual-Band Pass Interdigital Filter Using an Analytical Approach
Abstract In this paper, benefiting from frequency transformation between the normalized frequency domain of low-pass prototype frequencies and the real frequency domain of the filter, a purely analytical procedure for dual-band filter design is used. The coupling matrix of the filter is analytically extracted, without the need to perform numerical optimizati
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2022
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2. Thermal decomposition and reaction sintering for synthesis of mullite-zirconia composite using kaolin, γ-alumina and zirconia
Abstract The refractory materials used in the wall of the furnaces for glass melting can be prepared from mullite-zirconia composite material. The composite of mullite/zirconia was synthesized from Iraqi kaolin, γ-alumina, and zirconia using thermal decomposition with reaction sintering at 1600 °C. Several batches were prepared with various ratios of kaoli
Cerâmica. Publicado em: 2021-03
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3. 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
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4. GESTIÓN DEL CRECIMIENTO URBANO EN EL FRENTE COSTERO METROPOLITANO Y NUEVAS TERRITORIALIDADES
Resumo No presente trabalho, aborda-se a problemática do processo de gestão da expansão urbana na costa metropolitana de Buenos Aires, a partir da análise do projeto Nueva Costa del Plata (NCdP), empreendimento imobiliário que afeta terras ambientalmente frágeis no litoral sul. Para tanto, assume-se que o principal fator constituindo desta dinâmica es
Mercator (Fortaleza). Publicado em: 09/12/2019
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5. Microstructural Evolution and Phase Transformation of a Ti-5Nb-5Al Alloy During Annealing Treatment
The microstructural evolution and phase transformation of a Ti-5Nb-5Al alloy during isothermal annealing treatment were studied in this paper. The microstructural evolution was analyzed by X-ray diffraction (XRD), scanning electron microscope (SEM) equipped with X-ray energy dispersive spectroscopy (EDS) and electron backscattering diffraction (EBSD). The fi
Mat. Res.. Publicado em: 05/12/2019
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6. Microstructure and Thermal Analyses of Cu87-xAl13Nbx High-Temperature Shape Memory Alloys
This paper presents a thermal and microstructural characterization of Cu87-xAl13Nbx (wt%) high temperature shape memory alloys (HTSMA), with Nb contents ranging from 1 to 3%. The alloys were obtained by arc melting under argon atmosphere. Thermal characterization was performed by differential scanning calorimetry (DSC), revealing that the phase martensitic t
Mat. Res.. Publicado em: 28/11/2019
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7. La vida social de la energía: apuntes para el estudio territorializado de las transiciones energéticas
Abstract This paper presents a theoretical and methodological proposal for the sociological study of energy transition towards non-conventional renewable energy, as a process of induced transformation related to climate change, whose courses of action are not exempt from socio-technical controversies. The proposal is based on a four-year research program on
Sociologias. Publicado em: 02/09/2019
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8. Influence of Zirconium Percentage on Microhardness and Corrosion Resistance of Ti50 Ni50-xZrx Shape Memory Alloys
To obtain high temperature shape memory alloys of the lower cost Ni-Ti-X system, elements such as Hf and Zr are introduced to modify the thermal and mechanical properties of these alloys. This work studied the production and characterization of Ti50 Ni50-x Zrx alloys (x = 0, 5, 10 at.%) with the aim of improving their thermal, mechanical and corrosion resist
Mat. Res.. Publicado em: 19/08/2019
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9. Effects of composition on transformation temperatures and microstructure of Ni-Ti-Hf shape memory alloys
Abstract High transformation temperature shape-memory alloys (HTSMA) usually present a martensitic transformation temperature (Ms) starting at 100 ºC. That is the case of high nickel Ni-Ti-Hf alloys. This article presents experimental results obtained from arc melting of Ni50Ti50-XHfX .at% (X = 8, 11, 14, 17 and 20 .at%) alloys. This process homogenized eve
REM, Int. Eng. J.. Publicado em: 2019-06
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10. Microstructure, Mechanical Properties and in vitro Biological Behavior of Silicon Nitride Ceramics
The bioinert surface of silicon nitride ceramics led us to investigate the additions of SiO2, CaO and Al2O3 in order to aid the liquid phase sintering and improve the mechanical properties and biological behavior of the final materials. The sintered materials reached ca. 97% of theoretical density and total α→β-Si3N4 transformation. The samples had relat
Mat. Res.. Publicado em: 13/09/2018
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11. Alterations in the expression and activity of extracellular matrix components in HPV-associated infections and diseases
Infection with human papillomaviruses is associated with a series of benign and malignant hyperproliferative diseases that impose a heavy burden on human populations. A subgroup of mucosal human papillomavirus types are associated with the majority of cervical cancers and a relevant fraction of vulvar, vaginal, anal, penile and head and neck carcinomas. Huma
Clinics. Publicado em: 06/09/2018
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12. Evolución microestructural durante el envejecimiento a alta temperatura de una aleación 35Ni-25Cr-Nb
ABSTRACT The dendritic-type microstructure of the 35Ni-25Cr-Nb alloy, in the as-cast condition, consists of an austenitic matrix and two types of eutectic primary carbides; Nb-rich MC type and Cr-rich M23C6 type both presents in interdendritic edges and grain boundaries. During aging at 800ºC for different times, M23C6 type secondary carbides precipitate in
Matéria (Rio J.). Publicado em: 19/07/2018