A Theoretical Model of Augmented Reality Acceptance in Urban Cultural Heritage Tourism

Latest mobile technologies have revolutionised the way people experience their environment. Recent research explored the opportunities of using augmented reality (AR) in order to enhance the user experience however, there is only limited research on users’ acceptance of AR in the tourism context. The technology acceptance model is the predominant theory for researching technology acceptance. Previous researchers used the approach of proposing external dimensions based on secondary literature; however missed the opportunity to integrate context specific dimensions. This paper therefore aims to propose an AR acceptance model in the context of urban heritage tourism. Five focus groups, with young British female tourists visiting Dublin and experiencing a mobile AR application, were conducted. The data were analysed using thematic analysis and revealed seven dimensions that should be incorporated into AR acceptance research including information quality, system quality, costs of use, recommendations, personal innovativeness and risk as well as facilitating conditions

Model systems in heterogeneous catalysis: towards the design and understanding of structure and electronic properties

We discuss in this paper two case studies related to nano-particle catalyst systems. One concerns a model system for the Cr/SiO2 Phillips catalyst for ethylene polymerization and here we present XPS data to complement the previously published TPD, IRAS and reactivity studies to elucidate the electronic structure of the system in some detail. The second case study provides additional information on Au nano-particles supported on ultrathin MgO(100)/Ag(100) films where we had observed a specific activity of the particle’s rim at the metal–oxide interface with respect to CO2 activation and oxalate formation, obviously connected to electron transfer through the MgO film from the metal substrate underneath. Here we present XPS and Auger data, which allows detailed analysis of the observed chemical shifts. This analysis corroborates previous findings deduced via STM

Epithelial sodium channel activity in detergent-resistant membrane microdomains.

The activity of epithelial Na(+) selective channels is modulated by various factors, with growing evidence that membrane lipids also participate in the regulation. In the present study, Triton X-100 extracts of whole cells and of apical membrane-enriched preparations from cultured A6 renal epithelial cells were floated on continuous-sucrose-density gradients. Na(+) channel protein, probed by immunostaining of Western blots, was detected in the high-density fractions of the gradients (between 18 and 30% sucrose), which contain the detergent-soluble material but also in the lighter, detergent-resistant 16% sucrose fraction. Single amiloride-sensitive Na(+) channel activity, recorded after incorporation of reconstituted proteoliposomes into lipid bilayers, was exclusively localized in the 16% sucrose fraction. In accordance with other studies, high- and low-density fractions of sucrose gradients likely represent membrane domains with different lipid contents. However, exposure of the cells to cholesterol-depleting or sphingomyelin-depleting agents did not affect transepithelial Na(+) current, single-Na(+) channel activity, or the expression of Na(+) channel protein. This is the first reconstitution study of native epithelial Na(+) channels, which suggests that functional channels are compartmentalized in discrete domains within the plane of the apical cell membrane.Journal ArticleResearch Support, Non-U.S. Gov'tinfo:eu-repo/semantics/publishe

Supports and Modified Nano-particles in Designing Model Catalysts

In order to design catalytic materials, we need to understand the essential causes for material properties resulting from its composite nature. In this paper we discuss two, at first sight, diverse aspects: a) the effect of the oxide-metal interface on metal-nanoparticle properties and b) the consequences of metal particle modification after activation on the selectivity of hydrogenation reactions. However, those two aspects are intimately linked. The metal-nanoparticles electronic structure changes at the interface as a catalyst is brought to different reaction temperatures due to morphological modifications in the metal and, as we will discuss, those changes the chemistry leading to changes in the reaction path. As the morphology of the particle varies, facets of different orientation and size are exposed which may lead to a change in surface chemistry as well. We use two specific reactions to address those issues in some detail. To the best of our knowledge the present paper reports the first observations of this kind for well-defined model systems. The changes of the electronic structure of Au nanoparticles due to their size and interaction with a supporting oxide are revealed as a function of temperature using CO2 activation as a probe. The presence of spectator species (oxopropyl) as formed during an activation step of acrolein hydrogenation, strongly controls the selectivity of the reaction towards hydrogenation of the unsaturated C-O vs. the C-C bond on Pd(111) when compared with oxide supported Pd nanoparticles.Fil: Obrien, C. P.. US Army Research Laboratory; Estados UnidosFil: Dostert, K. H.. Fritz-Haber Institut der Max-Planck Gesellschaft; AlemaniaFil: Hollerer, M.. University of Graz; AustriaFil: Stiehler, Christian. Fritz-Haber Institut der Max-Planck Gesellschaft; AlemaniaFil: Calaza, Florencia Carolina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; Argentina. Fritz-Haber Institut der Max-Planck Gesellschaft; AlemaniaFil: Schauermann, S.. Fritz-Haber Institut der Max-Planck Gesellschaft; AlemaniaFil: Shaikhutdinov, S.. Fritz-Haber Institut der Max-Planck Gesellschaft; AlemaniaFil: Sterrer, M.. University of Graz; AustriaFil: Freund, H. J.. Fritz-Haber Institut der Max-Planck Gesellschaft; Alemani