ERROR:SQLSTATE[HY000]: General error: 20018 Invalid column name 'CodigoInstitucion'. [20018] (severity 16) [SELECT PublicObrasAutores.NumeroEmpleado, PublicObrasAutores.ApellidoPaterno, PublicObrasAutores.ApellidoMaterno, PublicObrasAutores.Nombre, PublicObrasAutores.NombreCompleto FROM PublicObrasAutores LEFT JOIN PublicObrasAutoresFil ON PublicObrasAutores.RefPublicacion = PublicObrasAutoresFil.RefPublicacion WHERE PublicObrasAutores.RefPublicacion = '614831' AND PublicObrasAutores.NumeroEmpleado IS NULL AND PublicObrasAutoresFil.CodigoInstitucion IS NOT NULL;]
®
ERROR:SQLSTATE[HY000]: General error: 20018 Invalid column name 'CodigoInstitucion'. [20018] (severity 16) [SELECT PublicObrasAutores.NumeroEmpleado, PublicObrasAutores.ApellidoPaterno, PublicObrasAutores.ApellidoMaterno, PublicObrasAutores.Nombre, PublicObrasAutores.NombreCompleto FROM PublicObrasAutores LEFT JOIN PublicObrasAutoresFil ON PublicObrasAutores.RefPublicacion = PublicObrasAutoresFil.RefPublicacion WHERE PublicObrasAutores.RefPublicacion = '614831' AND PublicObrasAutores.NumeroEmpleado IS NULL AND PublicObrasAutoresFil.CodigoInstitucion IS NULL;]
®
ERROR:SQLSTATE[HY000]: General error: 20018 Invalid column name 'Institucion'. [20018] (severity 16) [SELECT Institucion FROM PublicObrasAutoresFil WHERE RefPublicacion = '614831']
®
ERROR:SQLSTATE[HY000]: General error: 20018 Invalid column name 'Institucion'. [20018] (severity 16) [SELECT Institucion FROM PublicObrasAutoresFil WHERE RefPublicacion = 614831 AND InstitucionPropia = 'S'
UNION
SELECT Adscripciones.Entidad FROM PublicacionesObras
JOIN PublicObrasAutores ON PublicacionesObras.Identificador = PublicObrasAutores.RefPublicacion
JOIN Adscripciones ON PublicObrasAutores.NumeroEmpleado = Adscripciones.NumeroEmpleado
WHERE (PublicacionesObras.FechaPublicacion BETWEEN Adscripciones.FechaDesde AND Adscripciones.FechaHasta OR (PublicacionesObras.FechaPublicacion >= Adscripciones.FechaDesde AND Adscripciones.FechaHasta IS NULL)) AND PublicacionesObras.Identificador= 614831]
SIIA Público
SISTEMA INTEGRAL DE INFORMACIÓN ACADÉMICA - PÚBLICO
Título del libro: European Corrosion Congress 2009, Eurocorr 2009 Título del capítulo: Nanoparticle density effect upon microalloyed pipeline steel sour corrosion
Microalloyed pipeline steels achieve part of their mechanical strength through dispersion strengthening due to the fine and homogeneous distribution of nanoparticles. These nanoparticles are complex nanoprecipitates of microalloying elements such as V, Nb and Ti mostly combined with C and N depending over the microalloyed steel chemical composition and manufacturing procedure. Ming-Chung Zao and Ke Yang (1) has been studied the enhancement of this dispersion strengthening by tempering the steels at a suitable temperature. At several tempering exposing times the microalloying elements that were still located within the Iron lattice of the steel can re-diffuse given different nanoprecipitates sizes, densities and distribution. Nevertheless, Chung reports that the yield strength and sulphide stress cracking resistance were significantly improved under sour environment; a systematic electrochemical corrosion study under these steel tempering settings has not been carried out. Furthermore the correlation of nanoparticle density and their corrosion behaviour has not been elucidated too. Hence, the aim of this work is to determine the correlation and quantification effect of nanoprecipitates size, density and distribution in the microstructure, about the corrosion mechanisms of an API X52 microalloyed pipeline steel. Experimental Electrochemical Impedance Spectroscopy data simulated with Equivalent Electric Circuits and Polarization Curves under sour environment at room temperature and 50 °C were used for this purpose.
