Results 21 to 30 of about 7,842 (105)
New Reflections on Gravitational Duality
Frontiers in Physics, 2018 In general terms duality consists of two descriptions of one physical system by using degrees of freedom of different nature. There are different kinds of dualities and they have been extremely useful to uncover the underlying strong coupling dynamics of
Hugo García-Compeán +2 more
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Tejiendo voces. Jóvenes universitarios opinan sobre la apropiación de Internet en la vida académica
Chasqui, 2012 Artículo producto de la investigación titulada “Acceso, uso y apropiación de las Tecnologías de Información y Comunicación, TIC, en la comunidad académica de la UNAM”, realizada en el marco del Macroproyecto 1 “Tecnologías para la universidad de la ...
Delia Crovi Druetta +1 more
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Implementation of a Controller to Eliminate the Limit Cycle in the Inverted Pendulum on a Cart
Complexity, Volume 2019, Issue 1, 2019., 2019 A frequency response‐based linear controller is implemented to regulate the inverted pendulum on a cart at the inverted position. The objective is to improve the performance of the control system by eliminating the limit cycle generated by the dead‐zone, induced by static friction, at the actuator of the mechanism.
Mayra Antonio-Cruz +4 more
wiley +1 more source
Integrating Frequency Setting, Timetabling, and Route Assignment to Synchronize Transit Lines
Journal of Advanced Transportation, Volume 2019, Issue 1, 2019., 2019 Synchronization of different transit lines is an important activity to increase the level of service in transportation systems. In particular, for passengers, transferring from one line to another, there may be low‐frequency periods and transfer zones where walking is needed, or passengers are exposed to adverse weather conditions and uncomfortable ...
Omar J. Ibarra-Rojas +4 more
wiley +1 more source
Optimizing a Biobjective Production‐Distribution Planning Problem Using a GRASP
Complexity, Volume 2018, Issue 1, 2018., 2018 This paper addresses a biobjective production‐distribution planning problem. The problem is formulated as a mixed integer programming problem with two objectives. The objectives are to minimize the total costs and to balance the total workload of the supply chain, which consist of plants and depots, considering that it represents a company vertically ...
Martha-Selene Casas-Ramírez +5 more
wiley +1 more source
Mathematical Problems in Engineering, Volume 2018, Issue 1, 2018., 2018 During the design of nonimaging Fresnel lenses, the reflectance losses at the refracting surfaces should be taken into account because, depending on the parameters of each prism, semiacceptance angle θin and output angle θout, these losses can decrease the total efficiency of the lens.
Perla M. Viera-González +4 more
wiley +1 more source
Quantum Cosmology of Quadratic f(R) Theories with a FRW Metric
Advances in Mathematical Physics, Volume 2017, Issue 1, 2017., 2017 We study the quantum cosmology of a quadratic f(R) theory with a FRW metric, via one of its equivalent Horndeski type actions, where the dynamic of the scalar field is induced. The classical equations of motion and the Wheeler‐DeWitt equation, in their exact versions, are solved numerically.
V. Vázquez-Báez +2 more
wiley +1 more source
Mathematical Problems in Engineering, Volume 2017, Issue 1, 2017., 2017 We address a logistics districting problem faced by a parcel company whose operations consist of picking up and delivering packages over a service region. The districting process aims to find a partition of the service region into delivery and collection zones that may be served by a single vehicle that departs from a central depot.
Rosa G. González-Ramírez +5 more
wiley +1 more source
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 +8 more
wiley +1 more source
Algebraic and toroidal representation of the genetic code
Frontiers in Applied Mathematics and StatisticsThe genetic code is a set of regulatory principles that control the translation of information encoded in messenger RNA (mRNA) into a sequence of amino acids.
Rodrigo Rodríguez-Gutiérrez +3 more
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