Results 21 to 30 of about 33,065,951 (98)

Noticias de la sociedad colombiana de matemáticas [PDF]

, 1965
La Sociedad Colombiana de Matemáticas y el Departamento de Matemáticas de la Universidad Nacional han organizado el I CONGRESO BOLIVARIANO DE MATEMATICAS Y IV CONGRESO NACIONAL DE MATEMATICAS que tendrá como sede la ciudad de BOGOTA, Facultad de Ciencias
Revista de, Matemáticas Elementales
core   +1 more source

Tracking Control for Mobile Robots Considering the Dynamics of All Their Subsystems: Experimental Implementation

Complexity, Volume 2017, Issue 1, 2017., 2017
The trajectory tracking task in a wheeled mobile robot (WMR) is solved by proposing a three‐level hierarchical controller that considers the mathematical model of the mechanical structure (differential drive WMR), actuators (DC motors), and power stage (DC/DC Buck power converters).
José Rafael García-Sánchez, Ramón Silva-Ortigoza, Salvador Tavera-Mosqueda, Celso Márquez-Sánchez, Victor Manuel Hernández-Guzmán, Mayra Antonio-Cruz, Gilberto Silva-Ortigoza, Hind Taud, Jinde Cao   +8 more
wiley   +1 more source

Noncontact Optical Fiber Sensor for Measuring the Refractive Index of Liquids

Journal of Sensors, Volume 2016, Issue 1, 2016., 2016
A noncontact optical fiber sensor for measuring the refractive index of transparent liquids is proposed. It operates by calculating the path of a focused laser beam at 635 nm that travels across the boundaries of a liquid sample. The optical power Fresnel reflections are detected and, subsequently, the refractive index is determined as the ratio ...
R. Selvas-Aguilar, A. Castillo-Guzman, L. Cortez-Gonzalez, D. Toral-Acosta, A. Martinez-Rios, G. Anzueto-Sanchez, V. M. Duran-Ramirez, S. Arroyo-Rivera, Xingwei Wang   +8 more
wiley   +1 more source

The Mother's Day Geomagnetic Storm on 10 May 2024: Aurora Observations and Low Latitude Space Weather Effects in Mexico

Space Weather, Volume 22, Issue 11, November 2024.
Abstract On 10 May 2024, a severe geomagnetic storm coinciding with Mother's Day in Mexico lasted over 40 hr and produced polar auroras observable at low latitudes. This storm, the most intense since 2003, resulted from a series of solar flares and coronal mass ejections from active region 3664.
J. A. Gonzalez‐Esparza, E. Sanchez‐Garcia, M. Sergeeva, P. Corona‐Romero, L. X. Gonzalez‐Mendez, J. F. Valdes‐Galicia, E. Aguilar‐Rodriguez, M. Rodriguez‐Martinez, C. Ramirez‐Pacheco, C. I. Castellanos, M. Pazos, B. Mendoza, V. J. Gatica‐Acevedo, A. Melgarejo‐Morales, R. Caraballo, E. Andrade‐Mascote, P. Villanueva‐Hernandez, R. Bonifaz‐Alfonzo, P. Sierra, E. Romero‐Hernandez, I. Peralta‐Mendoza, E. Perez‐Tijerina, J. C. Mejia‐Ambriz, C. Guerrero‐Peña, A. Caccavari, G. Cifuentes‐Nava, E. Hernandez‐Quintero   +26 more
wiley   +1 more source

Bilevel Programming and Applications

Mathematical Problems in Engineering, Volume 2015, Issue 1, 2015., 2015
A great amount of new applied problems in the area of energy networks has recently arisen that can be efficiently solved only as mixed‐integer bilevel programs. Among them are the natural gas cash‐out problem, the deregulated electricity market equilibrium problem, biofuel problems, a problem of designing coupled energy carrier networks, and so forth ...
Vyacheslav V. Kalashnikov, Stephan Dempe, Gerardo A. Pérez-Valdés, Nataliya I. Kalashnykova, José-Fernando Camacho-Vallejo, Sergii V. Kavun   +5 more
wiley   +1 more source

Earthquakes Trigger Rapid Flash Boiling Front at Optimal Geologic Conditions

Geophysical Research Letters, Volume 51, Issue 16, 28 August 2024.
Abstract The interplay between seismic activity and fluid flow is essential during the evolution of hydrothermal systems. Although earthquakes can trigger transient fluid flow and phase changes in dilational jogs, the temporal scale and the geologic conditions that enhance such process are poorly quantified.
P. Sanchez‐Alfaro, I. Wallis, P. Iturrieta, J. Rowland, D. Dempsey, J. O’Sullivan, M. Reich, J. Cembrano   +7 more
wiley   +1 more source

Solving the Bilevel Facility Location Problem under Preferences by a Stackelberg‐Evolutionary Algorithm

Mathematical Problems in Engineering, Volume 2014, Issue 1, 2014., 2014
This research highlights the use of game theory to solve the classical problem of the uncapacitated facility location optimization model with customer order preferences through a bilevel approach. The bilevel model provided herein consists of the classical facility location problem and an optimization of the customer preferences, which are the upper ...
José-Fernando Camacho-Vallejo, Álvaro Eduardo Cordero-Franco, Rosa G. González-Ramírez, Jianming Shi   +3 more
wiley   +1 more source

Perfiles emocionales del profesorado novel sin formación docente al iniciar la enseñanza profesional

Ensayos Pedagógicos
El inicio de la enseñanza involucra la confluencia de múltiples preocupaciones y emociones con el profesorado novel como protagonista. Al respecto, el presente artículo describe los perfiles emocionales resultado de la primera experiencia de enseñanza en
Erick Zorobabel Vargas Castro
doaj   +1 more source

Low Temperature Synthesis of Hexagonal Bi2Te3 Nanoplates Using an Open Reactor and Its Effect on Their Physicochemical Properties

Journal of Nanotechnology, Volume 2024, Issue 1, 2024.
This report presents the physicochemical properties of hexagonal Bi2Te3 nanoplates chemically prepared in an open reactor at a lower temperature (140°C) than those reported for controlled condition techniques. The samples were drop‐cast on glass and FTO substrates for subsequent structural, chemical, and thermoelectric analyses. The electron microscopy
Laura A. Reyes-Verdugo, Maria de J. Martinez-Carreon, C. D. Gutierrez-Lazos, Francisco J. Solis-Pomar, Jose G. Quiñones-Galvan, Eduardo Perez-Tijerina, Marco Rossi   +6 more
wiley   +1 more source

US Natural Gas Market Classification Using Pooled Regression

Mathematical Problems in Engineering, Volume 2014, Issue 1, 2014., 2014
Natural gas marketing has considerably evolved since the early 1990s, when a set of liberalizing rules were passed in both the United States and the European Union that eliminated state‐driven regulations in favor of open energy markets. These new rules changed many things in the business of energetics, and therefore new research opportunities arose ...
Vyacheslav V. Kalashnikov, Gerardo A. Pérez-Valdés, Timothy I. Matis, Nataliya I. Kalashnykova, Sergii V. Kavun   +4 more
wiley   +1 more source