Nova Scientia  

Gabriela Leija Hernández,José Luis López Bonilla,Luis Alejandro Iturri Hinojosa

The methodology to properly calculate the heights of the antennas above the surface of the Earth in a line-of-sight (LOS) microwave link from its radio profile is presented. The effect of the Earth's atmosphere on RF signals, the effective Earth radius fa... see more

Umberto Filobello-Nino,Héctor Vázquez-Leal,Yasir Khan,D. Pereyra-Díaz,A. Pérez-Sesma,A. Díaz-Sánchez

In this article, modified non-linearities distribution homotopy perturbation method (MNDHPM) is used in order to find power series solutions to ordinary differential equations with initial conditions, both linear and nonlinear. We will see that the method... see more

J. J. Montor-Antonio,C. Olvera-Carranza,D. Reyes-Duarte,B. Sachman-Ruiz,L. Ramírez-Coutiño,S. Del Moral

Amylase (EC 3.2.1.1) from Bacillus amyloliquefaciens JJC33M (AmiJ33) was produced by submerged fermentation. Peptone, yeast extract, Ca+2 and the glycine effect over AmiJ33 production was analyzed shown that yeast extract and Ca+2 concentration increased ... see more

R. Chiu,M. Mora-González,D. López-Mancilla

Introduction: Chaotic systems are of great interest in various branches of science and engineering. Many works have been proposed in order to solve some different interesting problems, such that determining structural damages in materials or for secure co... see more

Javier García-Tobar

The aim of this paper is to investigate the influence of meteorology on short-term radon level of an underground laboratory. Radon concentration and ambient parameters were measured hourly at the same time between 2011 and 2013. Simultaneously, the meteor... see more

Carlos A. de Luna-Ortega,Miguel Mora-González,Julio C. Martínez-Romo,Francisco J. Luna-Rosas,Jesús Muñoz-Maciel

It this paper we present an algorithmic alternative to the current Automatic Speech Recognition (ASR) systems by proposing a way to characterize words based on approximations that use an extracted coefficient from Linear Predictive Coding (LPC). The metho... see more

Noé Aguilar Rivera

The sugar industry in Veracruz participates with 40% of the national production of sucrose and integrates agricultural activities of growing, harvesting and transportation of sugarcane with production in sugar mills. However, it has challenges related to ... see more

Heraclio García-Cervantes,Isaac Rodríguez-Vargas

We study the electronic structure of n-type delta-doped quantum wells in GaAs in which the multiple well system is built according to the Fibonacci sequence. The building blocks A and B correspond to delta-doped wells with impurities densities n2DA and n2... see more

Héctor Vázquez-Leal,Karem Boubaker

In this paper, two methods are applied to a system of nonlinear differential equations that models the evolution of consumption of cocaine in Spain. Theoretical considerations have been detailed as guides to demonstrate the ability and reliability of both... see more

Miriam Lucía Rocha Navarro,Sanjuana Serrano Reyes,Martha Eugenia Fajardo Araujo,Víctor Hugo Giovani Servín Zavala

Introduction: Periodontal diseases are common in children and adolescents, and some are quickly destructive. The international consensus of Periodontology of 1999, in force until today, included the gingivitis as part of the PDs. This study focused on the... see more

Diego Seuret Jiménez,Samuel Oseguera

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Leticia X. López-Martínez,Luisa M. Aguilar Cisneros,Octavio Dublán-García

The onion (Allium cepa L.) has been cultivated for thousands of years and is an important component of human diet. Recent studies suggest that onion can be used to reduce or prevent health problems such as asthma, cardiovascular diseases and diabetes due ... see more

Arturo Arvizu Mondragón,Josué Aarón López Leyva,Juan Carlos Murrieta Lee,Luis Alberto Morán Medina,Ramón Muraoka Espíritu,Joel Santos Aguilar

Currently the free-space optical links have different applications (some of them are already commercialized and other are in the stage of development) such as: a) horizontal communication links within the same layer of Earth's atmosphere (FSO links, i.e. ... see more

Ángel Ríos-Utrera,René Calderón-Robles,Juvencio Lagunes-Lagunes,Jorge Oliva-Hernández

In the tropical region of Mexico, the study of preweaning and postweaning productive peformance of lambs generated by crossbreeding, needs to be carried out in order to determine the productive and economic convenience of using specialized meat sheep bree... see more

Víctor Meza-Villalvazo,Alfredo Trejo Córdova,Héctor Magaña Sevilla,Carlos Sandoval Castro,Alfonso Chay-Canul,Adriana Cavazos Garduño,Cecilia Martínez-Sánchez

Polyunsaturated fatty acids are modified in rumen, given rise to isomers of conjugated linoleic acid (CLA), which, under in vitro conditions, has been shown to improve the resistance to manipulation and embryo survival. However, under these conditions is ... see more

José Beltrán Cuevas,Dulce María Quintero Romero,Justiniano González González

The oral conditions and deterioration increase their presence among the people at all levels: local, regional and national levels, with higher in the poorest conditions, so efforts have been coordinated between educational institutions and the health sect... see more

Marcela Victoria Rendón Cobián

Context is an essential element in understanding social action. Within the study of organizations, it incorporates elements of sense -history and culture- as well as rationality -decisions- and subjectivity -emotional- that influences the way to interpret... see more

Antonio Altamirano-Corro,Rebeca del Rocío Peniche-Vera

Introduction: This paper proposes an approach to measure the institutional efficiency combining data envelopment analysis (DEA) with artificial neural networks (ANN). The proposed approach is applied to Mexican colleges of engineering as a case of study. ... see more

Edgardo Jonathan Suárez-Domínguez,Yolanda Guadalupe Aranda-Jiménez,Arturo Palacio-Pérez,Elena Izquierdo-Kulich

Earth architecture implies sustainable constructive processes as it uses vernacular and lasting materials whose waste are of low impact to the environment. Poured earth is a technique from which resistant walls can be obtained in the housing construction ... see more