The nitric oxide ISO photocatalytic reactor system: Measurement of NOx removal activity and capacity

Although the NO removal-based air-purification ISO method ISO 22197-1:2007 is well established, its preconditioning requirements mean that only the initial activity of the photocatalyst under test is measured owing to the often-reported, gradual alteration of the surface kinetics for NO oxidation by air through the accumulation of surface HNO3. Herein, we compare the photocatalytic NO removal abilities of a number of different, common TiO2 materials, surface-saturated with photogenerated HNO3, with their behaviours observed during the typical 5 h-long ISO standard test. It is found that all the TiO2 materials studied eventually become largely NO to NO2 converters after sufficient exposure to NO under irradiation (>5 h) due to the accumulation of surface HNO3. The UV exposure time, t*, necessary to reach this HNO3 saturated condition is different for each different catalyst. As a consequence, an alternative preconditioning process for the ISO method is proposed which can be used to provide a more realistic measure of the photocatalytic activity of the underlying material and provide a measure of the NOx removing capacity of the photocatalytic material under test.

Evaluating fault tolerance on asymmetric multicore systems-on-chip using iso-metrics

The end of Dennard scaling has promoted low power consumption into a firstorder concern for computing systems. However, conventional power conservation schemes such as voltage and frequency scaling are reaching their limits when used in performance-constrained environments. New technologies are required to break the power wall while sustaining performance on future processors. Low-power embedded processors and near-threshold voltage computing (NTVC) have been proposed as viable solutions to tackle the power wall in future computing systems. Unfortunately, these technologies may also compromise per-core performance and, in the case of NTVC, xreliability. These limitations would make them unsuitable for HPC systems and datacenters. In order to demonstrate that emerging low-power processing technologies can effectively replace conventional technologies, this study relies on ARM’s big.LITTLE processors as both an actual and emulation platform, and state-of-the-art implementations of the CG solver. For NTVC in particular, the paper describes how efficient algorithm-based fault tolerance schemes preserve the power and energy benefits of very low voltage operation.

Kinetics of the photocatalysed oxidation of NO in the ISO 22197 reactor

The photocatalytic reactor described in the NOx removal ISO 22197-1:2007 is used to study the kinetics of the process, using a film of P25 TiO2 which has either been conventionally pre-irradiated in a stream of air, or unconventionally in a stream of NO (1 ppmv). In the former case it is shown that the system does not achieve steady state exit levels of NO, probably due to the gradual accumulation of HNO3 on the surface of the photocatalyst. The NO-preconditioned TiO2 film demonstrated excellent steady-state levels when monitored as a function of NO concentration, [NO] and UV irradiance, ρ. However, in this case the photocatalytic reaction under study is NOT NOx removal, but the conversion of NO to NO2. It is shown that the kinetics of this steady state process fit very well to a kinetic expression based on a disrupted adsorption reaction mechanism, which has also been used by others to fit their observed (non-steady state) kinetics for NOx removal on conventionally-(air) preconditioned films of P25. The appropriateness of this model for either system is questioned, since in both systems the kinetics appear to have a significant mass transport element. These findings suggest that mass transport and non-steady-state kinetics are likely to be significant features for most active photocatalytic samples, where the %NO conversion is >7%, and so limits the usefulness of the NOx removal ISO 22197-1:2007.

Materials in extreme environments for energy, accelerators and space applications at ELI-NP.

As a leading facility in laser-driven nuclear physics, ELI-NP will develop innovative research in the fields of materials behavior in extreme environments and radiobiology, with applications in the development of accelerator components, new materials for next generation fusion and fission reactors, shielding solutions for equipment and human crew in long term space missions and new biomedical technologies. The specific properties of the laser-driven radiation produced with two lasers of 1 PW at a pulse repetition rate of 1 Hz each are an ultra-short time scale, a relatively broadband spectrum and the possibility to provide simultaneously several types of radiation. Complex, cosmic-like radiation will be produced in a ground-based laboratory allowing comprehensive investigations of their effects on materials and biological systems. The expected maximum energy and intensity of the radiation beams are 19 MeV with 10^9 photon/pulse for photon radiation, 2 GeV with 108 electron/pulse for electron beams, 60 MeV with 10^12 proton/pulse for proton and ion beams and 60 MeV with 107 neutron/pulse for a neutron source. Research efforts will be directed also towards measurements for radioprotection of the prompt and activated dose, as a function of laser and target characteristics and to the development and testing of various dosimetric methods and equipment.

Propuesta de normalización bibliográfica para la creación de metadatos basados en Dublin Core en los Repositorios Universitarios del proyecto 3R

El proyecto de 3R-Red de Repositorios Universitarios de Recursos Digitales es un trabajo de investigación orientado a desarrollar un prototipo de Repositorios Universitarios (RU) dentro de la UNAM. Parte de su trabajo se centra en la elaboración de políticas de descripción bibliográfica para aquellos objetos digitales que conforman los RU adscritos al proyecto. Actualmente esta labor ha consistido en el análisis y valoración de la Iniciativa de Metadatos Dublin Core (DCMI por sus siglas en inglés), en tanto que es un protocolo de transferencia de metadatos adecuado a los requerimientos de 3R. Sin embargo, dada la ambigüedad que DCMI presenta al momento de asentar información en algunos de sus elementos —tales como título, creador, editor y colaborador—, se previó la necesidad de utilizar esquemas alternos que coadyuven a la consignación y normalización de la información sobre los objetos digitales que conforman los RU. Por lo tanto, el presente trabajo aborda de manera concreta el problema de la descripción bibliográfica y de información en los quince elementos que componen el núcleo de Dublin Core, en paticular cuatro de ellos, al tiempo que propone la utilización de esquemas de codificación alternos para la descripción bibliográfica, como es el caso de las Reglas de Catalogación Angloamericanas 2a. edición (RCA2) y diferentes normas ISO, con el fin de obtener un cuerpo de metadatos que permita la recuperación y el intercambio de información entre los distintos Repositorios Universitarios que integran el proyecto de 3R.

Informe información en línea

Banco del conocimiento

Implementación del sistema de aseguramiento de calidad ISO 9002.

Tesis (Maestría en Ciencias de la Administración con Especialidad en Producción y Calidad) UANL

Certificación de las normas ISO-9000 aplicado a la industria manufacturera del ramo de la electrónica

Tesis (Maestría en Ciencias de la Administración con Especialidad en Producción y Calidad) UANL

Impacto de los sistemas de información en la implementación de un sistema de calidad

Tesis (Maestría en Ciencias de la Administración con Especialidad en Sistemas) UANL

Implementación del sistema de aseguramiento de calidad ISO 9002 por Jesús González Olivo

Tesis (Maestría en Ciencias de la Administración con Especialidad en Producción y Calidad) - U.A.N.L, 1997

Sistema de implementación ISO 9000

Tesis (Maestría en Ciencias de la Administración con Especialidad en Relaciones Industriales)- UANL, 1998

Implementación de un sistema de aseguramiento de calidad para la empresa DYMO Plásticos, S.A. con el fin de obtener la certificación a la norma ISO-9002 por Felipe de Jesús Díaz Morales

Tesis (Maestría en Ciencias de la Administración con Especialidad en Producción y Calidad) - U.A.N.L, 1998

Asegurando la satisfacción del cliente ISO 9000

Tesis (Maestría en Ciencias de la Administración con Especialidad en Producción y Calidad) - U.A.N.L., 1999

Manual de auditoría con base a la norma ISO 9000

[Tesis] ( Maestría en Contaduría Pública) U.A.N.L.