Zobrazeno 1 - 10
of 17
pro vyhledávání: '"R. C. S. Costa"'
Autor:
M. C. Romeu, F. W. de O. Amarante, M. A. S. da Silva, Antonio Sergio Bezerra Sombra, T. S. M. Fernandes, G. D. Saraiva, R. C. S. Costa, A. D. S. Bruno Costa
Publikováno v:
Journal of Advanced Dielectrics. :417-427
This paper presents a study of the structure and microwave properties of [Formula: see text] substituted into the Ti 4+ site of calcium titanate ceramics. The structural and dielectric properties of solid solutions in CaTi 1-x( Nb 1/2 Fe 1/2)x O 3, w
Autor:
J. W. Stewart, R. C. S. Costa, A. J. Drehman, Pierre Basílio Almeida Fechine, R. S. T. Moretzsohn, Cynthia Junqueira, J. Derov, Antonio Sergio Bezerra Sombra
Publikováno v:
Microwave and Optical Technology Letters. 50:2852-2857
The main objective of this work was to study the magnetic and dielectric properties of Y3Fe5O12 and Gd3Fe5O12 garnets resonator antennas obtained from a new procedure in the solid state ceramic technique. These ferrite resonator antennas (FRAs) had t
Autor:
R. C. S. Costa, Fks Silva, CF Oliveria Neto, Haywood Dail Laughinghouse, B. G. Santos Filho, A. K. S. Lobato, F. J. R. Cruz
Publikováno v:
Asian Journal of Plant Sciences. 7:44-49
Publikováno v:
Scopus-Elsevier
Autor:
M. A. P. da Silva, R. C. S. Costa
Publikováno v:
Anais do XX Congresso Brasileiro de Engenharia Química.
Autor:
G. Orjubin, T. Cordaro, R. C. S. Costa, Francisco Nivaldo Aguiar Freire, Antonio Sergio Bezerra Sombra, R. S. T. M. Sohn, H.H.B. Rocha, Cynthia Junqueira
Publikováno v:
Microwave and Optical Technology Letters. 49:409-413
The probe-feed cylindrical dielectric resonator antennas (DRA) based on a new magnetodielectric composites Cr0.75Fe1.25O3 (CRFO)/Fe0.5Cu0.75Ti0.75O3 (FCTO) are investigated. The experimental and theoretical characteristics of the antenna like return
Autor:
G. D. Saraiva, R. C. S. Costa, A. D. S. Bruno Costa, M. A. S. da Silva, Antonio Sergio Bezerra Sombra, F. W. de O. Amarante, T. S. M. Fernandes
Publikováno v:
2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011).
Modified CaTiO 3 (CTO) ceramics were prepared by the conventional solid-state method. The samples belong to the Pbnm spatial group, showing an orthorhombic structure. The microwave dielectric properties of the Ca[(Li 1/3 Nb 2/3 ) x Ti 1−x ]O 3−δ
Autor:
D. G. Sousa, F. W. de O. Amarante, R. C. S. Costa, Antonio Sergio Bezerra Sombra, M. A. S. da Silva, A. D. S. Bruno Costa, Gilberto Dantas Saraiva, T. S. M. Fernandes
Publikováno v:
Physica Scripta. 84:055701
We report a study of the structural and thermal characteristics of calcium titanate alloys Ca[(Li1/3Nb2/3)xTi1−x]O3−δ (abbreviated as CNLTO). CNLTO alloys were prepared using a new procedure in the solid-state reaction method. Then they were stu
Publikováno v:
Phytochemistry. 17:505-509
A new phenol in Leptodactylon and Linanthus leaf has been identified by spectral procedures as 5,7-dimethoxy-8-hydroxycoumarin. This structure has been confirmed by synthesis. Leptodactylone is unique among simple hydroxycoumarins in its yellow colou
Autor:
Rajender S. Varma, Dennis A. Smith, Ana M. B. S. R. C. S. Costa, Michael Jones, Francis M. Dean
Publikováno v:
J. Chem. Soc., Chem. Commun.. :1224-1226
Lithium di-isopropylamide at –70 °C can remove the α-proton from benzofuran in the absence of activating groups and the β-proton if such groups are present; in flavone and 4-methoxycoumarin β-deprotonation occurs readily and the carbanions are