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Now showing items 1-12 of 12

Caracterización preliminar de dos microcuencas en el cantón Zaruma (Ecuador) y elaboración de propuestas de seguimiento de la calidad del agua.

Espinoza Reyes, Alexander Oswaldo (2016-05-19)

[EN] In recent years, mountain ecosystems in southern Ecuador have experienced increasing pressure associated with the exploitation and extraction of natural resources; These activities generally produce waste of different ...
Designing a Sustainable Development Goal Index through a Goal Programming Model: The Case of EU-28 Countries

Guijarro, Francisco; Poyatos-León, Juan Ángel (MDPI AG, 2018)

[EN] The 17 Sustainable Development Goals (SDGs) adopted by the United Nations are at the center of the global political agenda to eradicate extreme poverty, achieve universal education, promote gender equality and ensure ...
Drazin inverse based numerical methods for singular linear differential systems

Coll Aliaga, Peregrina del Carmen; Ginestar Peiro, Damián; Sánchez Juan, Elena; Thome Coppo, Néstor Javier (ELSEVIER SCI LTD, 2012)

[EN] In this paper, numerical methods for the solution of linear singular differential system are analyzed. The numerical solution of initial value problem by means of a corresponding finite difference approach and a ...
Estudio de pantallas acústicas 'in situ'

GARCÍA QUINTERO, CARLOS (2014-02-17)

El ruido ambiental es una consecuencia directa no deseada de las propias actividades que se desarrollan en las grandes ciudades y que incide de forma principal en la calidad de vida de la población. Una medida importante ...
MODELO DE PREDICCIÓN DEL LPI CON INDICADORES EXTERNOS USANDO EL MÉTODO PCA. CASO ESTUDIO COLOMBIA

Cabuya Padilla, Brigitte (2017-09-04)

The present research aims at finding the external variables that best describe the logistic performance of a country. For this, the variables that theoretically characterize the logistics were identified, once the PCA ...
Multiobjective design of wearable sensor systems for electrocardiogram monitoring

Martinez-Tabares, F. J.; Costa-Salas, Y. J.; Cuesta Frau, David; Castellanos-Dominguez, G. (Hindawi Publishing Corporation, 2016)

Wearable sensor systems will soon become part of the available medical tools for remote and long term physiological monitoring. However, the set of variables involved in the performance of these systems are usually ...
On a new generalized inverse for matrices of an arbitrary index

Malik, Saroj B.; Thome, Néstor (Elsevier, 2014-01-01)

[EN] The purpose of this paper is to introduce a new generalized inverse, called DMP inverse, associated with a square complex matrix using its Drazin and Moore-Penrose inverses. DMP inverse extends the notion of core ...
Parametrized solutions X of the system AXA = AEA and A^k EAX = XAEA^k for a matrix A having index k

Ferreyra, David Eduardo; Latanzi, Marina; Levis, Fabian; Thome, Néstor (University of Wyoming Libraries, 2019-11)

[EN] Let A and E be n x n given complex matrices. This paper provides a necessary and sufficient condition for the solvability to the matrix equation system given by AXA = AEA and A(k) EAX = XAEA(k) , for k being the index ...
Smart city: Diagnóstico de la ciudad de Guayaquil (Ecuador)

Salavarria Peña, Oscar Osvaldo (2018-02-26)

[EN] According to data from the United Nations (UN), 54.6% of the people live in cities, where more than ¿ of gross domestic product is produced. Furthermore, the International Organization of United Nations forecast that ...
The class of m-EP and m-normal matrices

Malik, Saroj B.; Rueda, Laura; Thome, Néstor (Taylor & Francis, 2016-11)

The well-known classes of EP matrices and normal matrices are de- fined by the matrices that commute with their Moore-Penrose inverse and with their conjugate transpose, respectively. This paper investigates the class ...
Understanding the local reactivity in polar organic reactions through electrophilic and nucleophilic Parr functions.

Domingo, Luis R.; Pérez, Patricia; Sáez-Cases, José Antonio (Royal Society of Chemistry, 2013)

[EN] Building upon our recent studies devoted to the bonding changes in polar reactions [RSC Advances, 2012, 2, 1334 and Org. Biomol. Chem., 2012, 10, 3841], we propose herein two new electrophilic, P-k(+), and nucleophilic, ...
Understanding the regioselectivity in hetero Diels-Alder reactions. An ELF analysis of the reaction between nitrosoethylene and 1-vinylpyrrolidine.

Domingo, Luis R.; Pérez, Patricia; Sáez-Cases, José Antonio (Elsevier, 2013-01-07)

[EN] The regioselectivity in the hetero Diels-Alder reaction between nitrosoethylene 1 and 1-vinylpyrrolidine 2 has been studied by a comparative ELF bonding analysis along the IRC of the endo/ortho and endo/meta regioisomeric ...