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Search Results: 1 - 10 of 15957 matches for " Raquel Salazar Moreno "
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Game Theory Applications in a Water Distribution Problem  [PDF]
Ardeshir Ahmadi, Raquel Salazar Moreno
Journal of Water Resource and Protection (JWARP) , 2013, DOI: 10.4236/jwarp.2013.51011
Abstract:

A water distribution problem in the Mexican Valley is modeled first as a three-person noncooperative game. Each player has a five-dimensional strategy vector, the strategy sets are defined by 15 linear constraints, and the three payoff functions are also linear. A nonlinear optimization problem is first formulated to obtain the Nash equilibrium based on the Kuhn-Tucker conditions, and then, duality theorem is used to develop a computational procedure. The problem can also be considered as a conflict between the three players. The non-symmetric Nash bargaining solution is suggested to find the solution. Multiobjective programming is an alternative solution concept, when the water supply of the three players are the objectives, and the water authority is considered to be the decision maker. The optimal water distribution strategies are determined by using these solution concepts and methods.

An Artificial Neural Network Model to Analyze Maize Price Behavior in Mexico  [PDF]
Raquel Salazar Moreno, Oscar Zerecero Salazar
Applied Mathematics (AM) , 2018, DOI: 10.4236/am.2018.95034
Abstract: Mexican producers were supported by the Government from 1993-2013 through the PROCAMPO (support program, direct subsidy from the federal government), in order to keep the prices stable. The tool used to analyze the basic products price behavior was Artificial Neural Network (ANN) models. Data from the period 1980 to 2014 was available, and two ANN models were implemented, one including only internal prices of related products and the second takes into account also the international maize price. The purpose of this paper was to analyze the impact of internal related products and international maize price on the behavior of internal maize price. Both models demonstrated the powerful of the ANN for prediction of the maize price 3 and 5 years ahead. Also, a sensitivity analysis was performed using Garson’s algorithm, through which was demonstrated that rice, safflower and sorghum are corn’s complementary products. The rice price was the variable with a major positive impact on the national corn price. On the other hand, wheat, soybean and barley behave as corn’s substitute products, with wheat price being the variable with major impact on the corn price. Including the international corn price improves the model performance, besides there was a negative sensitivity between the international and national corn price; this behavior is explained by the fact that during PROCAMPO existence, the national prices were forced to be stable while the international maize price was increasing. Finally, this study showed the application of the ANN models in a particular product price behavior, with the possibility of being used in the decision making process for the application of subsidies to the agricultural producers in public policies.
La Hemoglobina en la población Venezolana
Salazar-Lugo,Raquel;
Investigación Clínica , 2004,
Abstract: abstract hemoglobin variants were introduced in venezuela mainly by the descendants of african slaves; their distribution is determined by the flow of these populations into the country. the most prevalent hemoglobin variants are hb s and hb c. hb s has a frequency between 0 and 7% depending on the african component of the region. the study of βs gene linked haplotypes has been used to investigate the origins of african populations in america. in venezuela, the βs mutation is associated with the benin and bantu haplotypes (car) with a high frequency. according to these results the africans transported to venezuela were of bantu origin as it has been showed by the historical records
Patrón clínico y hematológico de pacientes con drepanocitosis o diagnóstico presuntivo de talasemia
Vilachá, Daniella;Salazar, Raquel;
Revista de investigación clínica , 2006,
Abstract: clinical and hematological characteristics of 14 patients with sickle cell anemia; one heterozygous as, and 7, with diagnostic of microcytic hypochromic anemia were analyzed. hemoglobin phenotypes were identified by electrophoresis, fetal hemoglobin was quantificated for alkaline denaturation and the hba2 for ionic exchange chromatography; -α3,7-thalassemia was detected by mutation identification using polymerase chain reaction (pcr). ss phenotype was confirmed in 10 patients, two were ssf, one was ssfa2, and one was asf (hbf - 2%). the patient diagnosed as as was ssf (hbf = 21%). ad-patients presented a moderate clinical course of the illness. five microcytic hypochromic anemia patients were hbaa, one was hbaaa2 and another hbaaf; those patients present a high hematological and clinical variation, β-thalassemia was 19%. -α3,7 -thalassemia was not detected. infection was most frequent clinical manifestation (respiratory tract infection and intestinal parasitism). these results shows that -α3,7 -thalassemia are not modulator genetic factors of clinical and hematological manifestations of patients with microcytic hypochromic anemia and sickle cell anemia. we suggest that environmental factors such as respiratory tract infection and intestinal parasitism may be affect the course of illness.
Estado de conocimiento de las concentraciones de cadmio, mercurio y plomo en organismos acuáticos de Venezuela - Current state of knowledge of the concentrations of cadmium, mercury and lead from aquatic organisms of Venezuela
Salazar Lugo, Raquel
REDVET , 2009,
Abstract: ResumenEn Venezuela, la contaminación por metales pesados está relacionadacon el desarrollo de la industria siderúrgica y petrolera, así como a la explotación indiscriminada de otros metales como el oro. Está bastante documentada la contaminación del lago de Maracaibo dado al desarrollo en sus cercanías de actividades urbanas, industriales, mineras y agropecuarias; del lago de Valencia, del río Tuy, Orinoco y Manzanares, entre otros En este trabajo se revisa el estado de conocimiento, en los últimos 10 a os, de la concentración de plomo, cadmio y mercurio en especies acuáticas de diferentes áreas del País.SummaryContamination due to trace metals in Venezuela is related withindiscriminate exploitation of metals like gold, transport of river runoff, oil and siderurgica industries and urban zones. The Tuy, Orinoco, Tigre, Manzanares rivers and others basins as Valencia and Maracaibo lakes has been reported as polluted for many years. In this work, we reviewed the state of knowledge, in the last 10 years, of metals concentrations specially lead, cadmium and mercury, in aquatic species from diverse areas of country.
La Hemoglobina en la población Venezolana Hemoglobin in the Venezuelan population
Raquel Salazar-Lugo
Investigación Clínica , 2004,
Abstract: Resumen La presencia de variantes hemoglobínicas en la población venezolana está íntimamente relacionada con la llegada de los africanos; es así como la distribución de las mismas responde a un patrón que está determinado por la manera como estas poblaciones se establecieron en nuestro territorio. La variantes mas frecuentes son la S y la C. La hemoglobina S se encuentra distribuida en el país en un porcentaje que oscila entre 0-7% dependiendo del componente africano de la región. El estudio de haplotipos del gen β-globina asociados al gen βS han servido para investigar los orígenes de las poblaciones africanas en América. En Venezuela se ha encontrado una asociación de los haplotipos Benin y Bantú (CAR) con el gen βS con una alta frecuencia De acuerdo a estos resultados se puede concluir que las poblaciones africanas venidas a Venezuela provienen del subsahara Bantú, tal y como ha sido determinado por los registros históricos. Abstract Hemoglobin variants were introduced in Venezuela mainly by the descendants of African slaves; their distribution is determined by the flow of these populations into the country. The most prevalent hemoglobin variants are Hb S and Hb C. Hb S has a frequency between 0 and 7% depending on the African component of the region. The study of βS gene linked haplotypes has been used to investigate the origins of African populations in America. In Venezuela, the βS mutation is associated with the Benin and Bantu haplotypes (CAR) with a high frequency. According to these results the Africans transported to Venezuela were of Bantu origin as it has been showed by the historical records
MODELO AUTOREGRESIVO MULTIVARIADO BASADO EN REGíMENES PARA LA GENERACIóN DE SERIES HIDROLóGICAS
MORENO CADAVID,JULIAN; SALAZAR,JOSé ENRIQUE;
DYNA , 2009,
Abstract: the aim of this paper is to show the use of a multivariate autoregressive model for synthetic hydrologic series generation. such model uses as input data the streamflows historical series but it also considers an exogenous variable for classes determination. this variable is the sst which is related, not just statistical but physically with the streamflows. as an example, the development of the model for three specific rivers of colombian system is presented in a long term horizon, using the noaa?s sst medium term forecast.
Dilemas de la perspectiva gubernamental del bienestar social. Mercado, regulación y solidaridad
Manuel Canto Chac,Pedro Moreno Salazar
Política y cultura , 1993,
Abstract:
MODELO AUTOREGRESIVO MULTIVARIADO BASADO EN REGíMENES PARA LA GENERACIóN DE SERIES HIDROLóGICAS
JULIAN MORENO CADAVID,JOSé ENRIQUE SALAZAR
DYNA , 2009,
Abstract: El objetivo de este artículo es presentar la utilización de un modelo autoregresivo multivariado para la generación de series hidrológicas sintéticas. Dicho modelo emplea como datos de entrada las series históricas de caudales pero además considera el uso de una variable exógena para la determinación de regímenes. Tal variable es la SST la cual está relacionada, no sólo estadística si no físicamente, con los caudales. A manera de ejemplo se muestra el desarrollo del modelo para tres ríos específicos del sistema hídrico Colombiano para un horizonte de largo plazo, empleando el pronóstico de mediano plazo de la NOAA para la SST.
Análisis estadístico de polimorfismos genéticos en estudios epidemiológicos
Iniesta,Raquel; Guinó,Elisabet; Moreno,Víctor;
Gaceta Sanitaria , 2005, DOI: 10.1590/S0213-91112005000400011
Abstract: analysis of genetic polymorphisms allows the genes that confer susceptibility to diseases to be analyzed. this paper presents the nomenclature used in genetic epidemiology literature and a basic strategy for statistical analysis of epidemiological studies that use genetic markers. first, a descriptive analysis of a single nucleotide polymorphism is presented, with assessment of hardy-weinberg equilibrium. next, methods to assess the association with disease are presented. to do this, logistic regression models are used and alternative models of inheritance are explored. finally, methods for the simultaneous analysis of multiple polymorphisms are presented: haplotype frequency estimation and analysis of disease association.
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