Results 81 to 90 of about 16,214 (207)

On the stability of minimal cones in warped products

, 2014
In a seminal paper published in $1968$, J. Simons proved that, for $n\leq 5$, the Euclidean (minimal) cone $CM$, built on a closed, oriented, minimal and non totally geodesic hypersurface $M^n$ of $\mathbb S^{n+1}$ is unstable.
Bezerra, K. S., Caminha, A., Lima, B. P.
core   +1 more source

Ontogeny of the Skeleton of Leporinus oliveirai (Characiformes, Anotomidae)

Journal of Morphology, Volume 286, Issue 5, May 2025.
In this study, we provide the first complete description of the skeleton ontogeny of an anostomid. The developmental sequence of 141 bony elements is described and illustrated. The main discoveries are numerous conical teeth on the premaxilla and dentary that are replaced with three or four large incisiform multicuspid teeth, that become unicuspid in ...
Mariana Pascoal Boaretto, Marcos Venturieri, José Luís Olivan Birindelli   +2 more
wiley   +1 more source

Efficient Fault Localization in Smart Grid Through Analysis of the Wave Matrix Image Using Convolutional Neural Networks

IEEE Access
This article presents a methodology for fault localization in electric power distribution systems through the analysis of wave matrix image using Convolutional Neural Networks (CNN).
Jose Carlos Filho, Francisco C. M. Abreu, Mauricio Silva, Fabbio Borges, Ricardo A. L. Rabelo   +4 more
doaj   +1 more source

Single-phase Active Power Filters With Reduced Number Of Power Switches And Optimum Voltage Control Angle

Eletrônica de Potência, 2013
This paper proposes some topologies of universal active power filter for single-phase applications with reduced number of components. Some configurations are proposed: two with both series and parallel converters connected in half-bridge, sharing the ...
Welflen R. N. Santos, Edison R. C. da Silva, Cursino B. Jacobina, Eisenhawer de M. Fernandes, Alexandre C. Oliveira, Rafael R. Matias, Dalton F. G. Filho, Otacilio M. Almeida, Patryckson M. Santos   +8 more
doaj   +1 more source

Lithium evolution in intermediate age and old open clusters: NGC 752 revisited

, 2004
We present new high resolution spectroscopic observations of the intermediate age (~2 Gyr) open cluster NGC 752. We investigate the Li vs. Teff distribution and we obtain a new accurate determination of the cluster metallicity. We compare the results for
Balachandran, Boesgaard, Boesgaard, Carlsson, Carretta, Chaboyer, Daniel, Friel, Friel, García López, Gratton, Grevesse, Heinemann, Hobbs, Hobbs, Jeffries, Jones, Kurucz, Martín, Nissen, P. Sestito, Pasquini, Pasquini, Pasquini, Pasquini, Piau, Piau, Pilachowski, Pinsonneault, Pinsonneault, Platais, R. Pallavicini, Randich, Randich, Randich, Randich, S. Randich, Sestito, Sneden, Soderblom, Spite, Swenson, Thorburn   +42 more
core   +1 more source

Enhanced Pollen Classification via Hybrid Neural Network With Attention Mechanism and View Separation: An Equatorial and Polar Approach

IEEE Access
Accurate classification of pollen grains is crucial for various fields, including ecology and food engineering. However, current approaches often face challenges due to limited data and the morphological variability of pollen grains.
Julio Cesar da Silva Soares, Kelson Romulo Teixeira Aires, Juliana do Nascimento Bendini, Wesley Vitor Barbosa Brandao, Rodrigo de Melo Souza Veras   +4 more
doaj   +1 more source

Phenotypic characterization of naturalized swine breeds in Brazil, Uruguay and Colombia

Brazilian Archives of Biology and Technology, 2010
Morphometric data was collected on 859 naturalized swine in Brazil (Piau, Tatu, Nilo, Caruncho, Casco de Burro, Moura, Monteiro and Rabo de Peixe), Colombia (Criolla Zungo, Sanpedreño and Casco de Mula) and Uruguay (Mamellado), both on farm and in ...
Concepta McManus, Samuel Rezende Paiva, Alva Vanessa Rezende Silva, Luci Sayori Murata, Helder Louvandini, Glória Patrícia Barrera Cubillos, Gustavo Castro, Rodrigo Alfredo Martinez, Maria Sílvia Llambi Dellacasa, Juan Esteban Perez   +9 more
doaj   +1 more source

Alimentação e distribuição de piaus (Pisces, Anostomidae) na Planície do Bananal, Mato Grosso, Brasil [PDF]

Revista Brasileira de Zoologia, 2004
Os peixes da família Anostomidae, conhecidos popularmente como piaus, são restritos à América do Sul e representam importante fonte de renda para pescadores de muitas regiões. Estudos na Amazônia Central demonstram que estes peixes apresentam alta plasticidade alimentar e estão amplamente distribuídos pela região.
Melo, Cesar Enrique de, Röpke, Cristhiana Paula   +1 more
openaire   +3 more sources

Adapted Volt-VAr Extremum-Seeking Method for Voltage Regulation and Loss Minimization in Low Voltage Distribution Networks

IEEE Access
The high penetration of Distributed Generation (DG) in the low-voltage distribution grid has raised several concerns in recent years, mainly regarding overvoltage at the buses caused by the reversal of active power flow.
J. H. S. Carvalho, W. M. Dos Santos, A. R. Almeida, B. F. S. Junior   +3 more
doaj   +1 more source

Análise Em Regime Permanente Do Filtro Ativo Universal

Eletrônica de Potência, 2013
Este trabalho trata da análise do filtro ativo universal trifásico operando em regime permanente. Este tipo de topologia é capaz de compensar componentes harmônicas na corrente e na tensão, bem como minimizar a circulação energia reativa.
Rafael R. Matias, Cursino B. Jacobina, Alexandre C. Oliveira, Welflen R. N. Santos   +3 more
doaj   +1 more source