Results 31 to 40 of about 127,976 (172)

Bifurcations in a Generalization of the ZAD Technique: Application to a DC‐DC Buck Power Converter

Mathematical Problems in Engineering, Volume 2012, Issue 1, 2012., 2012
A variation of ZAD technique is proposed, which is to extend the range of zero averaging of the switching surface (in the classic ZAD it is taken in a sampling period), to a number K of sampling periods. This has led to a technique that has been named K‐ZAD. Assuming a specific value for K = 2, we have studied the 2‐ZAD technique.
Ludwing Torres, Gerard Olivar, Simeón Casanova, Ahmad M. Harb   +3 more
wiley   +1 more source

Quantization Effects on Period Doubling Route to Chaos in a ZAD‐Controlled Buck Converter

Mathematical Problems in Engineering, Volume 2012, Issue 1, 2012., 2012
The quantization effect in transitions to chaos and periodic orbits is analyzed in this paper through a specific application, the zero‐average‐dynamics‐ (ZAD‐) controlled buck power converter. Several papers have studied the quantization effects in the one periodic orbit and some authors have given guidelines to design digitally controlled power ...
John Alexander Taborda, Daniel Burbano, Fabiola Angulo, Cristian Toma   +3 more
wiley   +1 more source

Extent of threats to marine fish from the online aquarium trade in the United States

Conservation Biology, Volume 40, Issue 1, February 2026.
The global marine aquarium hobby is a multibillion‐dollar industry, largely driven by demand from the United States. Much of this trade occurs online. We web scraped 4 major US‐based e‐commerce platforms selling marine aquarium fish to determine the retail price and source (wild capture, aquaculture, or both) of 13 families of ray‐finned marine fish ...
Bing Lin, Yiwen Zeng, Bryan To, Robert J. Holmberg, Andrew L. Rhyne, Michael Tlusty, David S. Wilcove   +6 more
wiley   +1 more source

Quantifying urban tree canopy cooling capacity using Bayesian hierarchical models and satellite imagery

PLANTS, PEOPLE, PLANET, Volume 8, Issue 1, Page 338-352, January 2026.
Cities are getting hotter because of climate change and urban development, increasing risks to health and well‐being. We analyzed how increasing urban tree canopy cover in city areas of 900 m2 can reduce land surface temperatures, using detailed aerial‐LiDAR and satellite data with Bayesian hierarchical models.
Ángel Ruiz‐Valero, Jaime Francisco Pereña‐Ortiz, Isidro Martín‐Lozano, Álvaro Cortés‐Molino, Pablo Cozano‐Pérez, Begoña Galindo‐Ruiz, Luis Alberto Díaz‐Galiano, Ángel Enrique Salvo‐Tierra   +7 more
wiley   +1 more source

Prototipos electrónicos innovadores para la solución de problemas de salud social

Revista Académica Arjé
El presente artículo presenta la creación de prototipos innovadores, desarrollados por estudiantes de la Universidad Técnica Nacional, Sede del Pacífico, en el III Cuatrimestre 2019, al poner en práctica los conocimientos aprendidos en el curso de ...
María Teresa Jiménez-Ramírez
doaj   +1 more source

La responsabilidad patrimonial de la administración pública por la publicación de contenidos en Internet [PDF]

, 2015
53 p.El presente capítulo parte de la idea de construir y generar conocimiento respecto del objeto sobre el cual se trabaja, para generar propuestas de solución a los problemas que se describen.
Becerra, Jairo, Cotino-Hueso, Lorenzo, García-Vargas, Claudia Bibiana, Sánchez-Acevedo, Marco Emilio, Torres-Ávila, Jheison   +4 more
core  

El Suministro Inmediato de Información en el impuesto sobre el valor añadido

IDP, 2017
El Suministro Inmediato de Información es el nuevo sistema de gestión del impuesto sobre el valor añadido, que supone un importante avance en la administración electrónica en el ámbito tributario, así como una intensificación del uso de las tecnologías ...
Ana María Delgado García, Rafael Oliver Cuello   +1 more
doaj   +1 more source

Large-Signal Nonlinear Average Model for a Voltage-Controlled Flyback Converter

Energies
Flyback converters are popular in various electronic applications due to their efficiency, galvanic isolation, and voltage stepping-up. However, their modeling and analysis present significant challenges.
David Eduardo Giraldo-Hernández, Mario Andrés Bolaños-Navarrete, Fabiola Angulo, Gustavo Osorio, Nicols Astaiza, Juan David Mina-Casaran, Wilder Herrera   +6 more
doaj   +1 more source

Multirresolución adaptativa de mallas triangulares basado en criterios de curvatura

Revista Colombiana de Computación, 2007
Los modelos 3D están compuestos por miles de polígonos y en ocasiones pueden obtenerse representaciones con la misma calidad visual pero con un menor número de polígonos, lo que hace que el costo computacional, de almacenamiento y de rendimiento ...
Alexánder Ceballos Arias, Jorge Luis Hernández, Flavio Prieto   +2 more
doaj  

Decreased resilience in power grids under dynamically induced vulnerabilities

New Journal of Physics, 2020
In this paper, a methodology inspired on bond and site percolation methods is applied to the estimation of the resilience against failures in power grids.
C C Galindo-González, D Angulo-Garcia, G Osorio   +2 more
doaj   +1 more source