Photocatalytic Reactors for Air Treatment: Energy Efficiencies and Kinetic Modeling

The energy efficiency of the photocatalytic conversion of gas-phase organic pollutants was studied using a redesigned and scaled up Photo-CREC-Air reactor. This photocatalytic unit has the unique feature of allowing an accurate analysis of the irradiation field by establishing macroscopic balances and in-situ measurements. The Photo-CREC-Air reactor operates in a batch mode with the photocatalyst supported by a stainless steel mesh being irradiated by 8 UV lamps. Kinetic modelling, Quantum Yields (QY) and Photochemical Thermodynamic Efficiency Factors (PTEF) were calculated using data for acetone , acetaldehyde and isopropanol photocatalytic degradation in ambient air utilizing a Degussa P25 photocatalyst. It is shown that the Photo-CREC-Air reactor is suitable for the determination of kinetic and adsorption parameters, given design with excellent irradiation usage and fluid-catalyst contact. In this respect, quantum yields for acetone, acetaldehyde and isopropanol supersede the value of 1 (equivalent to 100%) with PTEFs remaining in both cases below the level of 1 as required by thermodynamics

Cryptanalysis of the RSA-CEGD protocol

Recently, Nenadi\'c et al. (2004) proposed the RSA-CEGD protocol for certified delivery of e-goods. This is a relatively complex scheme based on verifiable and recoverable encrypted signatures (VRES) to guarantee properties such as strong fairness and non-repudiation, among others. In this paper, we demonstrate how this protocol cannot achieve fairness by presenting a severe attack and also pointing out some other weaknesses.Comment: 8 pages, 1 figur

An Intelligent Interactive Knowledge Model for Decision Support in Real Time Traffic Management

This paper proposes the use of advanced knowledge models to support real time decision for management problems as an adequate response to the current needs and technology. The new conditions for human operation created by the telematics technology are discussed and a general architecture using knowledge modelling techniques is proposed. Then, the application of the approach to support real time management of the private traffic in the city of Turin is described

Auditory and Spatial Assessment in Inattentive Children Using Smart Devices and Gesture Interaction

We present an interactive game for assessing auditory and spatial memory. We compared the performance of children with and without inattention using the game and using a variety of classical tools for assessment of auditory and spatial memory. The children with inattention showed statistically worse performance in the game. There were no statistically significant differences between the two groups for the satisfaction and interaction outcomes. Therefore, our game could be a good tool for distinguishing performances of children with and without inattention