Electrical Properties of Poly-N-Epoxypropylcarbazole/Vanadium Pentoxide Composite

In the present work the electrical properties of poly-N-epoxypropylcarbazole (PEPC) and vanadium pentoxide (V2O5) composite have been studied. The composite was formed by mixing of PEPC solution in benzene with V2O5 powder and stirring at room temperature. The composite solution was deposited on a dielectric substrate with copper electrodes and the Cu/PEPC-V2O5/Cu surface type film samples were fabricated. The Cu/V2O5/Cu samples were used as a reference where the films were deposited from the mixture of V2O5 powder in distilled water. Resistance-temperature relationship and voltage-current characteristics of the composite and V2O5 samples were studied by using conventional digital voltmeter and ammeter in the temperature range of 27-110 °C with an error of ±0.5%. It was observed that the DC electrical conductivity, activation energy and non-linearity of voltage-current characteristics of the samples are temperature dependent. It was found that the temperature dependence of electrical conductivity of the V2O5 samples on the whole obeys T-1/4 law whereas the PEPC-V2O5 ones show visible deviations from that. The PEPC-V2O5 samples may be used as thermistors as the temperature coefficient of their resistance is large and at 27 °C is equal to -4.7%/°C

A Taxonomy-Based Evaluation of Personalized E-Advertisement

The art of personalized e-advertising relies in attracting a user attention to the recommended product, as it relates to their taste, interest and data. Whilst in practice, companies attempt various forms of personalization, research of e-advertising is rare, and seldom routed in solid theory. Adaptive hypermedia (AH) techniques have contributed to the development of personalized tools for adaptive content delivery, mostly in educational domain. This study explores the use of these theories and techniques in a specific field -- adaptive e-advertisements, via implementing and evaluating an adaptive e-advertisement system called "MyAds". The novelty of this approach relies in a systematic design, implementation and evaluation based on an adaptive hypermedia taxonomy-. In particular, this paper reports on a case study, which investigated users' perceptions' on the proposed system MyAds and the reflection of the acceptance level of the users. The results from both implicit and explicit feedback indicated that users found MyAds acceptable and agreed that the implemented AH features within the system contributed to an enhanced experience through the exposure to different personalization methods. Appealing ideas of the system were ease of use, personalization and diversity in a non-intrusive way