Search on surfaces: Exploring the potential of interactive tabletops for collaborative search tasks

Collaborative information seeking often takes place in co-located settings; such opportunities may be planned (business colleagues meeting in a conference room or students working together in a library) or spontaneous (family members gathered in their living room or friends meeting at a café). Surface computing technologies (i.e., interactive tabletops) hold great potential for enhancing collaborative information seeking activities. Such devices provide engaging direct manipulation interactions, facilitate awareness of collaborators’ activities, and afford spatial organization of content. However, current tabletop technologies also present several challenges that creators of collaborative information seeking system must account for in their designs. In this article, we explore the design space for collaborative search systems on interactive tabletops, discussing the benefits and challenges of creating search applications for these devices. We discuss how features of our tabletop search prototypes TeamSearch, FourBySix Search, Cambiera, and WeSearch, illustrate different aspects of this design space.     

Confocal XRF depth profiling non-destructively reveals the original blue pigments in a Renaissance painting by Caroto

Recent restoration of The Rest on the Flight into Egypt by Giovanni Francesco Caroto, from the Louvre collections, included a technical examination of the Virgin's blue robe that aimed to characterize the original materials and later additions. The painting was examined using light microscopy and ultraviolet and infrared imaging, and one cross section was taken. None of these methods showed a clear distinction between the layers that were artist applied or modifications made by another hand. To gain information about the paint stratigraphy without taking additional samples, non-invasive confocal X-ray fluorescence (CXRF) analysis was carried out to examine several areas of the Virgin's robe. Using this technique, it was possible to identify the pigments and order of application of paint by the artist. All the pigments identified were considered to be artist applied, and on this basis no further cleaning was carried out and conservation proceeded with retouching of minor areas of loss or damage. This study highlights the advantages of CXRF analysis for the technical study of paintings, used in combination with classical methods for making informed conservation treatment decisions.     

Hosting the Olympic Games: an Overstated Advantage in Sports History

Previous research on the home advantage in the history of the Olympic Games has found initial evidence that host nations have won more medals than non-hosts. In this paper, we argue that these findings are a myth of sports history, providing poor estimates of the home advantage in the Olympics. We argue that selection bias accounts for the findings in previous work, which uses an empirical strategy of comparing host nations to all non-hosts and to historical performances of host countries with much smaller delegations. When we correct for this bias the evidence in favour of a hosting advantage disappears. Additionally, we argue that the existing literature has largely neglected the rules about athlete qualification for host countries. To the extent that a small home advantage does exist, it is almost entirely driven by increased participation rates.     

The Role of the Lebanese-Australian Diaspora in the Establishment of Rugby League in Lebanon

Abstract

The Lebanese Rugby League was formed in 1997 in Sydney when a team comprised of Australian-based players of Lebanese descent participated in an international tournament. The Lebanese national team later qualified for two rugby league men’s World Cups (2000 and 2017). The case demonstrates how diasporas can shape sport development. The accomplishment of the Lebanese team has also given the small country some exposure at the global level. Additionally, since 2002, a new sport has been established in Lebanon, making the country one of the few cases in the world where rugby league is more popular than rugby union. This paper examines diaspora issues including the assimilation of Lebanese emigrants into Australian sporting culture and strategic uses of citizenship. Furthermore, the research sheds light on the ‘glocalized’ development of rugby league in Lebanon by its establishment at private Lebanese universities while it is known in Australia for its working-class origins. There is a relationship of mutual dependence between diaspora and homeland: without its diaspora, Lebanon could not participate in the World Cup, and without domestic development in the sport (which includes, since 2015, also women’s teams), the diaspora would not be permitted to participate in global championships.     

A computational fluid dynamics model for wind simulation: model implementation and experimental validation

To provide physically based wind modelling for wind erosion research at regional scale, a 3D computational fluid dynamics (CFD) wind model was developed. The model was programmed in C language based on the Navier-Stokes equations, and it is freely available as open source. Integrated with the spatial analysis and modelling tool (SAMT), the wind model has convenient input preparation and powerful output visualization. To validate the wind model, a series of experiments was conducted in a wind tunnel. A blocking inflow experiment was designed to test the performance of the model on simulation of basic fluid processes. A round obstacle experiment was designed to check if the model could simulate the influences of the obstacle on wind field. Results show that measured and simulated wind fields have high correlations, and the wind model can simulate both the basic processes of the wind and the influences of the obstacle on the wind field. These results show the high reliability of the wind model. A digital elevation model (DEM) of an area (3800 m long and 1700 m wide) in the Xilingele grassland in Inner Mongolia (autonomous region, China) was applied to the model, and a 3D wind field has been successfully generated. The clear implementation of the model and the adequate validation by wind tunnel experiments laid a solid foundation for the prediction and assessment of wind erosion at regional scale.