The adoption of natural gas increased notably last years, and there is some recognition that it improves the quality of life of inhabitants. While initial acceptance is an essential first step, the continued use is relevant to the long-term success of any technology. However, the literature on energy has focused on adoption and has devoted less attention to models that explain continuance usage. Accordingly, this study developed a model to explain continuance usage, grounded in Expectation-Confirmation Model (ECM). Unlike adoption models, confirmation of previous expectations and satisfaction with the experience of use have a relevant role in this phenomenon. Data was gathered through a questionnaire to 435 users of the service in a Latin American metropolis, and structural equations model was used for analysis. The results show that constructs of the ECM (perceived usefulness, disconfir...

La subcuenca Linga constituye la parte alta del distrito de Cocachacra, departamento de Arequipa, lugar donde se desarrolla una intensa agricultura. En la subcuenca Linga afloran rocas intrusivas de composición félsica a intermedia (monzogranitos, monzonitas, monzodioritas, tonalitas y dioritas) y rocas volcánicas (andesitas,dacitas y tobas). Los suelos son el producto de la meteorización química y mecánica de las rocas, en este sentido los valores de fondo de los suelos están influenciadas principalmente por la química de las rocas. Los niveles de fondo geoquímico son fundamentales como base para la legislación ambiental del recurso suelo, y constituyen el primer paso en la evaluación de suelos contaminados; en este sentido para responder a la pregunta ¿Cuál es el valor de fondo de los elementos traza en los suelos de la subcuenca Linga?; se realizó el análisis estadísti...

Los aportes vertidos en el presente boletín están enmarcados en el Programa «El recurso suelo del Perú». Este programa comprende proyectos que se enfocan en la caracterización geoquímica y el levantamiento cartográfico de suelos, tomando como unidad de estudio las subcuencas hidrográficas con el propósito general de brindar información para varios fines, tales como la vinculación con los sectores productivos como el agrícola, ganadero y relacionados. Estos mapas de suelos tienen base geológica, precisamente de los cuadrángulos de La Joya (34s), Puquina (34t), Punta de Bombón (35s), y serán el punto de partida para orientar o enfocar estudios específicos o de desarrollo. La zona de estudio comprende las subcuencas hidrográficas Medio Bajo Tambo-Huayrondo. Se ubican en la parte media de la cuenca hidrográficas del Río Tambo y políticamente abarcan los departamentos de...

El presente trabajo está enmarcado en el Programa de la Carta Nacional de Suelos a escala 1/50000, dicho programa comprende el levantamiento de suelos, tomando como unidad de estudio las subcuencas; y tiene un propósito general puesto que busca brindar información para varios fines; además el mapa de suelos será el punto de partida para orientar o enfocar estudios específicos o de desarrollo. La zona de estudio comprende la subcuenca Medio Tambo, se ubican en la parte media de la cuenca del Río Tambo y políticamente abarcan los departamentos de Arequipa (provincia de Islay) y Moquegua (provincias General Sánchez Cerro y Mariscal Nieto). Los objetivos del estudio son: Realizar el levantamiento de suelos a escala 1/50000, determinar los valores de fondo y las concentraciones geoquímicas de base en suelos; así como observar las relaciones suelo, relieve, clima, geología. El leva...

Objective: To determine the ameliorative effect of the ethanolic extract of Chuquiraga spinosa (ChS) on 7,12-Dimethylbenz[a]anthracene (DMBA)-induced breast cancer in rats. Methods: 36 female Holztman rats were divided into 6 groups. I) The negative control group received physiological saline (PS). II) ChS-200 group received 200 mg/kg of ChS. III) DMBA group was induced with DMBA (20 mg/Kg) dissolved in PS and administrated orally for 15 weeks. IV) DMBA + ChS-50 group, V) DMBA + ChS-250 group, and VI) DMBA + ChS-500 group, which received the extract orally for 15 weeks after DMBA induction. All data were expressed as mean and standard deviation. One-way analysis of variance (ANOVA) followed by Dunnet test was carried out to compare the mean value of different groups Histopathological analysis was evaluated by using Image J software. Results: Hematology showed that the triglyceride level ...

Objective: To determine the ameliorative effect of the ethanolic extract of Chuquiraga spinosa (ChS) on 7,12-Dimethylbenz[a]anthracene (DMBA)-induced breast cancer in rats. Methods: 36 female Holztman rats were divided into 6 groups. I) The negative control group received physiological saline (PS). II) ChS-200 group received 200 mg/kg of ChS. III) DMBA group was induced with DMBA (20 mg/Kg) dissolved in PS and administrated orally for 15 weeks. IV) DMBA + ChS-50 group, V) DMBA + ChS-250 group, and VI) DMBA + ChS-500 group, which received the extract orally for 15 weeks after DMBA induction. All data were expressed as mean and standard deviation. One-way analysis of variance (ANOVA) followed by Dunnet test was carried out to compare the mean value of different groups Histopathological analysis was evaluated by using Image J software. Results: Hematology showed that the triglyceride level ...

The main characteristics of photovoltaic (PV) energy and its current development in Latin American and Caribbean countries (LAC); its impact on the electrification of homes, health institutions, and schools in isolated or difficult-to-access communities; and, the advantages thereof are presented and discussed by replacing the use of traditional fuels such as firewood and kerosene in order to improve inhabitants ’health as well as reducing CO2 emissions. Countries like Nicaragua, Peru, Brazil, Argentina, and Chile stand out for their growing PV energy development in the region. A case study of the electrification process by PV systems shows very positive changes are manifested in terms of improving the quality of life of the inhabitants, and especially their physical and mental health state. In addition, CO2 emission reductions from electrifying 216 houses in the nine communities reach ...