357 research outputs found
Diseño y validación de una herramienta de gestión del ciclo de vida de activos de producción en compañía minera poderosa para reducir costos de operación y mantenimiento
La empresa Compañía Minera Poderosa S.A. (CMPSA) requiere mejorar la toma
de decisiones en las reparaciones mayores (overhaul) para reducir los costos de
operación.
El proyecto consiste en elaborar una herramienta para el análisis y tomar la mejor
decisión de reemplazo o reparación del activo, basado en indicadores económicos
y de rendimiento.
La norma PAS 55-1 Gestión de Activos describe las especificaciones para la
gestión de activos físicos, publicada por primera vez en el año 2004 en respuesta
a la demanda por parte de la industria de un estándar para la gestión de activos.
Para la toma de decisiones acertadas, la norma PAS 55-1, expedida por la British
Standard, aconseja hacer uso del modelo costo de ciclo de vida (LCC) por sus
iniciales Life Cycle Costing, en la cual determina el momento recomendable, en
términos de costos, para reemplazar un activo, después de considerar los
diferentes costos asociados durante su vida útil: costos de inversión (CAPEX),
costos de operar (OPEX) y costos de eliminación.
Después de elaborar la herramienta de gestión del ciclo de vida de un activo
productivo de Compañía Minera Poderosa y analizar las alternativas: primera,
realizar una reparación mayor (Overhaul) del activo en servicio y segunda,
reemplazo del activo, se concluye, desde el punto de vista de evaluación de
proyectos, que ambas alternativas son viables; sin embargo, con el indicador /hora a 34.03
US$/hora realizando la reparación mayor (Overhaul)
Experimental determination of CO2 solubility in brines at high temperatures and high pressures and induced corrosion of materials in geothermal equipment
International audienc
Obtention de sels enrichis en minéraux d’intérêt. Approche expérimentale et modélisation
National audienc
Experimental measurements of CO2 solubility in salt solutions at high temperatures and high pressures
International audienc
EXPERIMENTAL STUDIES OF SOLUBILITY OF ELEMENTAL SULPHUR IN SUPERCRITICAL CARBON DIOXIDE BETWEEN 10 AND 40 MPA
International audienc
Experimental Measurements of Carbon Dioxide Solubility in Na–Ca–K–Cl Solutions at High Temperatures and Pressures up to 20 MPa
International audienceExperimental CO 2 solubility data in brine at high pressures and high temperatures are needed in different technologies such as carbon dioxide storage or geothermal process. A lot of data have been acquired in single-salt solutions, whereas data for mixed-salt solutions remain scarce. In this study, new carbon dioxide solubility data in salt solutions have been measured. Two synthetic brines have been studied at 323, 373, and 423 K from 1 to 20 MPa. The brine 1 is composed of a mixture of NaCl and CaCl 2 and the brine 2 is made from a mixture of NaCl, CaCl 2 , and KCl. Measurements have been carried out by conductimetric titration. In this study, 6 isotherms presenting 48 new solubility data have been reported. These results have been obtained in an original range of temperature, pressure, and salinity. In these conditions of temperature and pressure, we verified that an increase of the temperature or the salinity involves a decrease of the CO 2 solubility. On the other hand, an increase of the pressure implies an increase of the CO 2 solubility. Then, the obtained results were compared with the values calculated using PhreeSCALE and PSUCO2 models. The comparison between experimental and calculated values revealed a good agreement
Experimental Studies of solubility of Elemental Sulphur in Supercritical Nitrogen
International audienc
Efficacy of Trastuzumab in Routine Clinical Practice and After Progression for Metastatic Breast Cancer Patients: The Observational Hermine Study
Results of the Hermine study examining the use of trastuzumab for metastatic breast cancer patients in routine practice, including patients who received trastuzumab treatment beyond progression, are reported. The cardiac safety of trastuzumab in this setting is also reported
Observation of weak neutral current neutrino production of
Observation of \jpsi production by neutrinos in the calorimeter of the CHORUS detector exposed to the CERN SPS wide-band \numu beam is reported. A spectrum-averaged cross-section = (6.3 3.0) is obtained for 20 GeV 200 GeV. The data are compared with the theoretical model based on the QCD Z-gluon fusion mechanism
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