An analysis of accuracy experiments carried out over of a multi-faceted model of trust

Trust models in internet environments today are single-faceted. A single-faceted approach to modelling trust can suit some, or many, individuals but we believe that such a single-faceted approach cannot capture the wide and varied range of subjective views of trust found across a large and broad population. In response, we have designed, developed and evaluated a rich, semantic, human-centric model of trust that can handle the myriad of terms and intertwined meanings of trust. This multi-faceted model of trust can be Personalised on a per user basis and specialized on per domain basis. In this paper we briefly present an overview of this model and explain how it can be Personalised and specialized. However, the primary focus of this paper is on the experimental evaluation that has been carried out to evaluate the accuracy of recommendations based on this multi-faceted, Personalised model of trust for internet environments.     

Fullerene Desymmetrization as a Means to Achieve Single‐Enantiomer Electron Acceptors with Maximized Chiroptical Responsiveness

Solubilized fullerene derivatives have revolutionized the development of organic photovoltaic devices, acting as excellent electron acceptors. The addition of solubilizing addends to the fullerene cage results in a large number of isomers, which are generally employed as isomeric mixtures. Moreover, a significant number of these isomers are chiral, which further adds to the isomeric complexity. The opportunities presented by single‐isomer, and particularly single‐enantiomer, fullerenes in organic electronic materials and devices are poorly understood however. Here, ten pairs of enantiomers are separated from the 19 structural isomers of bis[60]phenyl‐C61‐butyric acid methyl ester, using them to elucidate important chiroptical relationships and demonstrating their application to a circularly polarized light (CPL)‐detecting device. Larger chiroptical responses are found, occurring through the inherent chirality of the fullerene. When used in a single‐enantiomer organic field‐effect transistor, the potential to discriminate CPL with a fast light response time and with a very high photocurrent dissymmetry factor (g_ph = 1.27 ± 0.06) is demonstrated. This study thus provides key strategies to design fullerenes with large chiroptical responses for use as chiral components of organic electronic devices. It is anticipated that this data will position chiral fullerenes as an exciting material class for the growing field of chiral electronic technologies.     

Energy transfer and photodegradation of a Perylene Orange:LDS821 system in poly(methyl methacrylate)

The luminescence of Perylene Orange and LDS821 in poly(methyl methacrylate) (PMMA) following a 532 nm irradiation yielded information on photodegradation and energy transfer. The irradiation of the Perylene Orange/LDS821/PMMA films resulted in (i) a maximum in the Perylene Orange fluorescence photodegradation profile and (ii) an enhancement of the LDS821 fluorescence relative to the LDS821/PMMA films. These results are attributed to an energy transfer from the Perylene Orange to the LDS821 with an energy transfer rate constant of 5.1+/- 0.75 (2sigma) x 10(11) M(-1) s(-1) and a F?rster critical radius of 65.7 A. Fluorescence half-quenching and time-resolved fluorescence measurements attributed energy transfer to the F?rster energy transfer with minor contributions of radiative energy transfer.