Javier Ernesto Rodríguez Yáñez

Javier Ernesto Rodríguez Yáñez
Universidad Estatal a Distancia · Laboratorio de Ecología Urbana

Master of Science

About

34
Publications
9,559
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146
Citations
Citations since 2016
15 Research Items
60 Citations
201620172018201920202021202202468101214
201620172018201920202021202202468101214
201620172018201920202021202202468101214
201620172018201920202021202202468101214

Publications

Publications (34)
Article
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The Western Central Valley (WCV) of Costa Rica is an area of interest, due to its high concentration of population and economic activity, presenting itself as a tropical monsoon-type atmospheric basin (AB), with well-defined climatic seasons (dry and rainy). The present study proposes the assessment of low carbon steel (CS) atmospheric corrosion, b...
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Costa Rica is an importer of most of the metallic materials it uses. In construction, Galvanized Steel (GS) is one of the most used elements in urban areas, where atmospheric corrosion is the main problem of its environmental deterioration. The area of greatest population and economic activity in Costa Rica is the San José Valley, which has a tropi...
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El Área de Conservación Guanacaste (ACG) en Costa Rica, posee un sector llamado El Hacha, el cual presenta sitios vulnerables a incendios forestales, principalmente por causas antropogénicas. Los sitios presentan un ecosistema de sabana, donde se seleccionaron dos áreas de trabajo, una con afectación y otra sin afectación por incendio. La vegetació...
Article
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The assessment of atmospheric corrosion is currently based on studies of atmospheric basins (AB). The models applied to the estimation of atmospheric corrosion imply measurements of several meteorological and atmospheric pollution parameters, which make the estimation complex. The main meteorological parameters to be considered in tropical atmosphe...
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Introducción: En Costa Rica, la emisión de gases de efecto invernadero de los vehículos agrícolas no suele medirse independientemente en los inventarios. Por lo general, se combinan con los datos del parque general de vehículos u otras emisiones. Objetivo: Determinar las emisiones y características específicas de los vehículos agrícolas en Costa Ri...
Article
Biopurification systems are useful in the management of pesticide residues and provide an option to dispose wastewaters of agricultural origin derived from pesticide application practices. The analysis of pesticide residues in the BPS biomixture is necessary to determine whether the removal of the target compounds occurs with reliable results. In t...
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Se aplicó el modelado por mixturas gaussianas para describir la distribución anual de dos variables meteorológicas importantes, temperatura y humedad relativa, dentro del Valle Central de Costa Rica desde el 2010 hasta el 2017. Se utilizó un número fijo de componentes gaussianas para ajustar los datos a una curva de mixtura general que representara...
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La compactación del suelo causada por el tráfico de maquinaria agrícola influye negativamente en una serie de funciones del suelo y servicios del ecosistema. Utilizando la información de los equipos agrícolas inscritos en Costa Rica y considerando que el límite promedio de peso que resiste el suelo en condiciones friables es de 49 kN por eje, se pl...
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The culture of castor bean use is growing in Latin America. After extracting the oil, the biomass waste is considered for energy based on its thermal energy potential of about 18 kJ*g-1. When using biomass, it is important for the product to be dry, both for its conservation and efficient use. The castor bean is separated into its three basic parts...
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Los inventarios de contaminantes presentan un modelo general de cálculo, o estimación, asociado a la relación entre los datos de información obtenidos y los factores utilizados. Estos plantean, por sus características, niveles de incertidumbre asociados a dicho cálculo. La evaluación de las incertidumbres en inventarios es una temática abordada des...
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Tuna and shark are the main fish in which analysis of mercury content are made in Costa Rica. The main destinations are domestic consumption, import and export, in that order. On these analyzes a simple statistical evaluation was performed to estimate the values of weekly intake recommended for risk groups according to Food and Agriculture Organiza...
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La recuperación de los capilares de Incoloy 825 utilizados en pozos geotérmicos ácidos, por medio de soldadura orbital autógena, se evalúa en este estudio desde el punto de vista de su resistencia a la corrosión, en las condiciones de uso. El análisis se realiza por medio de técnicas electroquímicas básicas. Se comparan los capilares soldados, con...
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Los peces de pico, como el marlín, el pez vela y el pez espada, son depredadores pelágicos superiores de la cadena alimenticia; los especímenes de gran tamaño contienen en sus tejidos niveles significativos de metilmercurio (MeHg+). En el presente trabajo se revisaron, clasificaron, tabularon y analizaron estadísticamente todos los registros de aná...
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Objetivo: Evaluar los niveles de mercurio (en mg/kg) en muestras de productos pesqueros, analizadas por el Laboratorio Nacional de Servicios Veterinarios (LANASEVE) del Servicio Nacional de Salud Animal (SENASA) de Costa Rica, durante el período 2003-2013, para sugerir un valor de Ingesta Semanal Tolerable Recomendada (ISTR) de pescados y mariscos....
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p class="p1">Se evaluaron tres diferentes métodos de deposición de estaño en platino policristalino (Pt pc ) desde una solución de ácido sulfúrico utilizando técnicas electroquímicas convencionales, con el fin de determinar y comparar su influencia en la oxidación de metanol. Los métodos probados fueron deposición espontánea, deposición a subpoten...
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During the construction of the Las Pailas geothermal plant, atmospheric corrosion was evaluated for 5 years. Atmospheric monitoring and gravimetric analysis with low alloy steel (ASTM A36), were done according to ISO 9223 and its associated procedure. There were low values of pollution by chlorides and sulfates, around 5 mg m-2 día-1 and without im...
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Se realizó una estimación de las emisiones de compuestos tóxicos generados por la flota vehicular en la Gran Área Metropolitana de Costa Rica para el año 2007. El cálculo se realizó mediante factores de emisión obtenidos con el modelo MOBILE 6 de la EPA, así como los datos de actividad aportados por la Dirección Sectorial de Energía y el Ministerio...
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We estimated emissions of toxic compounds generated by the vehicle fleet in the GAM for 2007. This calculation was performed using emission factors obtained with the model of the EPA MOBILE 6 and activity data provided by the Energy Sector Management and the Ministry of Public Works and Transportation.Of the total 914,486 tons emitted by mobile sou...
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The Corrosion maps used are to display quickly the different situations in a country. These maps developed are for low alloy steel in Costa Rica depending on climatic data and pollutant levels, considering the different regulations associated with ISO 9223 and models developed by the Center for Research in Corrosion (CICorr). The atmosphere in Cost...
Article
Full-text available
During the construction of the Las Pailas geothermal plant, atmospheric corrosion was evaluated for 5 years. Atmospheric monitoring and gravimetric analysis with low alloy steel (ASTM A36), were done according to ISO 9223 and its associated procedure. There were low values of pollution by chlorides and sulfates, around 5 mg m-2 día-1 and without im...
Article
Full-text available
El aluminio presenta una gran diversidad de usos en la vida actual. La posibilidad de deterioro de este metal debido a la corrosión por picadura es una de las consideraciones principales de los fabricantes, con el fin de evitar reclamos. La norma ASTM G100-89 plantea una metodología de valoración del aluminio por medio de la evaluación del potenci...
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The aluminum poses a versatility of uses in modern life. The possibility of deterioration of pitting them is one of the main considerations for the manufacturer, in order to avoid claims. In this sense ASTM G100-89 proposes a method of assessment of aluminum by means of the evaluation of potential versus applying cyclic galvanic polarizations affor...
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A partir de datos de corrosión atmosférica en diferentes sitios de Costa Rica, se realizan evaluaciones matemáticas de los modelos usuales de estimación de la velocidad de corrosión (Vcorr). Los datos de contaminantes y parámetros atmosféricos permiten una clasificación inicial de las categorías de corrosión atmosférica según la ISO 9223:1992, con...
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This paper studies the electrochemical behaviour of different types of low-cost commercial steel (A36, 430 and 304) as electrodes to obtain hydrogen. The aim of this work was to understand hydrogen evolution. The studies were conducted by different electrochemistry techniques like chronoamperometry and voltamperometric curves in different concentra...
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Se estudió el comportamiento electroquímico de los diferentes tipos de aceros comerciales de bajo costo (A36, 430 y 304) como electrodos para la obtención de hidrógeno. El propósito de este trabajo fue estudiar la evolución de hidrógeno, para lo cual se utilizaron técnicas electroquímicas como cronoamperometría y curvas voltamperométricas, en difer...
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The recovery of 316L steel capillaries used in neutral geothermal wells orbital welding by weld is evaluated from the point of view of its resistance to corrosion in the conditions of use, through basic electrochemical techniques. In the pre-treatment is more convenient than carrying out a chemical pickling prior to welding for 5 minutes. While sub...
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La recuperación de capilares de acero 316L utilizados en pozos geotérmicos neutros, por medio de soldadura orbital autógena, se evalúa desde el punto de vista de su resistencia a la corrosión en las condiciones de utilización, mediante técnicas electroquímicas básicas. En el pretratamiento se encuentra que es más conveniente realizar un decapado qu...
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Spontaneous deposition of tin (Sn) in polycrystalline platinum (Pt pc) from a sulfuric acid solution of tin salts, was evaluated by conventional electrochemical techniques, to determine its characteristics. Tin was deposited from a solution of SnCl2 or SnSO4 in sulfuric acid 1 M. The degree of surface coating by Sn was calculated by evaluating...
Article
The influence of ruthenium and osmium spontaneous deposition on polycrystalline platinum in sulfuric acid was studied by conventional electrochemical techniques. The inhibition of the hydrogen adatom voltammetric profile by the foreign adatoms was used to calculate the degree of surface coverage of ruthenium, osmium, and a mixture of both metal ion...
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The corrosion behaviour of naval steels is characterized by cyclic voltammetric profiles, open-circuit potential decays and polarization curves in 0.5 M sodium nitrate and in 0.6 M sodium chloride at 20 C. Naval steel surfaces can be modified by the application of periodic symmetric and/or asymmetric potential routines in strong alkaline solutions....
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The electrochemical behaviour of potentiodynamically formed thin anodic films of polycrystalline tin in aqueous sodium bicarbonate solutions (pH≈8.3) were studied using cyclic voltammetry and electrochemical impedance spectroscopy. Different equivalent circuits corresponding to various potential regions were employed to account for the electrochemi...
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The inhibitive properties of calcium benzoate for steel corrosion were studied in sodium nitrate solutions at room temperature. Corrosion parameters of the steel/nitrate and steel/benzoate+nitrate interfaces were obtained from polarisation curves. Adsorption parameters of benzoate on steel in sodium nitrate solutions were determined through changes...
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The formation and dissolution of tin ad-layers on polycrystalline platinum were analysed by cyclic voltammetry in aqueous 10–4M tin(II)/1M sulfuric acid in the 0.05–0.70V versus RHE range. At this concentration level it was possible to observe that platinum sites involving (110) planes are mainly related to tin underpotential deposition. In contras...
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The kinetics of molecular oxygen electroreduction were studied on platinum surfaces modified by tin underpotential deposition. The surface process was analysed by cyclic voltammetry in aqueous 10–4 M tin(II)/1 M sulfuric acid in the 0.05 to 0.70 V vs RHE range. Platinum sites involving (1 1 0) planes are mainly related to tin underpotential deposit...

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