Procesos: revista ecuatoriana de historia. 32 (S0LO LIBROS/Reseñas)

Presenta las reseñas de los siguientes libros: Antonio Annino y Rafael Rojas, La Independencia. Los libros de la patria, México, Centro de Investigación y Docencia Económicas (CIDE)/Fondo de Cultura Económica (FCE), 2008, 244 pp. -- Manuel Espinosa Apolo, Insumisa vecindad. Memoria política del barrio San Roque, Quito, Editorial Tribal/Quito Eterno, 2009, 201 pp. -- Franklin Cepeda Astudillo, Riobamba. Imagen, palabra e historia, Riobamba, Casa de la Cultura Ecuatoriana Benjamín Carrión, Núcleo de Chimborazo, 2001, 286 pp. -- Andrés Guerrero, Administración de poblaciones, ventrililoquia y transescritura. Análilisis históricos: estudios teóricos, Lima-Quito Instituto de Estudios Peruanos (IEP)/Flacso-Ecuador, 2010, 546 pp.

Common black coatings - reflectance and ageing characteristics in the 0.32-14.3 mu m wavelength range

The diffuse and regular reflectances of five optically absorbing coatings frequently used in optical systems, were measured over the 0.32-14.3 mu m wavelength range, before and after exposure to heat and intense optical radiation. The measured coatings included Nextel Velvet Black, an anodised coating and NPL Super Black. The anodised coating exhibited substantial variations in its diffuse and regular reflectance values after thermal and simulated solar ageing. Solar and thermal ageing of the Nextel Velvet Black resulted in increases of its reflectance. However, thermal ageing tended to decrease the reflectance of the other paint samples examined. Thermal and solar ageing of the NPL Super Black resulted in only minor changes in its reflectance characteristics. All measurements are traceable to the UK National Standards.