2,600 research outputs found
Narrative approaches to design multi-screen augmented reality experiences
This paper explores how traditional narrative language used in film and theatre can be adapted to create interactivity and a greater sense of presence in the virtual heritage environment. It focuses on the fundamental principles of narrative required to create immersion and presence and investigates methods of embedding intangible social histories into these environments. These issues are explored in a case study of Greens Mill in the 1830’s, interweaving the story of the reform bill riots in Nottingham with the life of George Green, mathematician and proprietor of the Mill
Narrating the past: virtual environments and narrative
This paper explores how traditional narrative language used in film and theatre can be adapted to create interactivity and a greater sense of presence in the virtual heritage environment. It focuses on the fundamental principles of narrative required to create immersion and presence and investigates methods of embedding intangible social histories into these environments. These issues are explored in a case study of Greens Mill in the 1830’s, interweaving the story of the reform bill riots in Nottingham with the life of George Green, mathematician and proprietor of the Mill
Exact and semiclassical approach to a class of singular integral operators arising in fluid mechanics and quantum field theory
A class of singular integral operators, encompassing two physically relevant
cases arising in perturbative QCD and in classical fluid dynamics, is presented
and analyzed. It is shown that three special values of the parameters allow for
an exact eigenfunction expansion; these can be associated to Riemannian
symmetric spaces of rank one with positive, negative or vanishing curvature.
For all other cases an accurate semiclassical approximation is derived, based
on the identification of the operators with a peculiar Schroedinger-like
operator.Comment: 12 pages, 1 figure, amslatex, bibtex (added missing label eq.11
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Augmented reality storytelling application for Riot 1831 exhibition [demonstration]
First, do no harm: Evaluating resources for teaching social entrepreneurship
We reviewed two key repositories of social entrepreneurship pedagogical resources: Ashoka.org and CasePlace.org. Each provides a set of useful resources, comprising videos, syllabi, cases, readings and other resources that make it easy for instructors to design social entrepreneurship courses, modules, or programs. We caution against what we see as overenthusiasm for the topic, however, since social entrepreneurship involves tinkering with social structures, sometimes with disastrous unintended effects. We advise instructors to teach their students to think critically about social entrepreneurship initiatives, since they include the potential for harm as well as good. © Academy of Management Learning & Education
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Selective Heat Sintering Versus Laser Sintering: Comparison of Deposition Rate, Process Energy Consumption and Cost Performance
The Selective Heat Sintering (SHS) process has become available as a low cost
alternative to Laser Sintering (LS) for the additive deposition of polymer objects. While both
processes belong to the powder bed fusion variant of Additive Manufacturing (AM) technology,
their operating principles vary significantly: SHS employs a thermal print head to selectively
fuse material powder, whereas the LS approach utilizes a laser beam coupled with a
galvanometer. Based on a series of build experiments, this research compares these technology
variants along three dimensions of process efficiency: deposition rate (measured in cm³/h),
specific process energy consumption (MJ/kg) and specific cost ($/cm³). To ensure that both
platforms are assessed under the condition of efficient technology utilization, an automatic
build volume packing algorithm is employed to configure a subset of build experiments.
Beyond reporting absolute and relative process performance, this paper additionally
investigates how sensitive the compared processes are to a variation in the degree of capacity
utilization and discusses the application of different levels of indirect cost in models of low cost
AM.Mechanical Engineerin
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Inserting Components into Geometries Constructed onto a Non-Standard Substrate for Electronics Packaging
Additive manufacturing (AM) has matured from its initial concept as a prototyping technique to an
industrial manufacturing process. Consequently, AM processes must meet relevant standards for
an increasing number of applications. Here, we investigate inserting components into geometries
constructed onto a silicon nitride substrate, using stereolithography (SLA), for the purpose of
electronics packaging. Compared to conventional processes, SLA avoids high temperatures and
stresses while permitting much greater flexibility to arrange components in three dimensions. This
facilitates an increased feature density and the construction of packages for use in complex spaces.
A characteristic of interest to this application, is the SLA material-substrate interaction and the
resulting quality of adhesion. The adhesion mechanism between SLA and silicon nitride is
investigated and substantially enhanced by a pre-treatment process. A process for then inserting
large and complex geometries and components into the SLA build process is identified and
compliance of the product with relevant standards is reviewed.Mechanical Engineerin
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High Viscosity Jetting of Conductive and Dielectric Pastes for Printed Electronics
Ink-jet printing of multiple materials in 3 dimensions is a promising alternative to
traditional patterning methods due to its flexibility, scalability and accuracy. However, the
printability of the inks is strongly restricted by material properties such as surface tension and
viscosity. Dispensing high viscosity fluids on a drop-on-demand approach is a potential solution
that can facilitate the incorporation of new materials to the jetting catalogue. Consequently, in
this study 2 micro-dispensing valves are used in combination with a mechanical stage to deposit
conductive and dielectric pastes with viscosities of 15.3 ± 0.2 and 0.638 ± 0.005 Pa·s (at 25°C
and 10 s-1 shear rate) respectively. Crucial printing parameters such as pressure, temperature,
pulse shape and drop spacing are studied in order to optimise the process. Additionally, post-printing characteristics such as contact angle of different materials and cured layer profiles are
also measured and taken into account during the designing of the 3D patterns to minimise the
negative effects of the thickness miss-match of different materials. Finally, the manufacturing
capability of the set-up is demonstrated by the fabrication of a functional device using a
combination of “pick-and-place” components and high viscosity jetting.Mechanical Engineerin
MODISTools - downloading and processing MODIS remotely sensed data in R
Remotely sensed data – available at medium to high resolution across global spatial and temporal scales – are a valuable resource for ecologists. In particular, products from NASA's MODerate-resolution Imaging Spectroradiometer (MODIS), providing twice-daily global coverage, have been widely used for ecological applications. We present MODISTools, an R package designed to improve the accessing, downloading, and processing of remotely sensed MODIS data. MODISTools automates the process of data downloading and processing from any number of locations, time periods, and MODIS products. This automation reduces the risk of human error, and the researcher effort required compared to manual per-location downloads. The package will be particularly useful for ecological studies that include multiple sites, such as meta-analyses, observation networks, and globally distributed experiments. We give examples of the simple, reproducible workflow that MODISTools provides and of the checks that are carried out in the process. The end product is in a format that is amenable to statistical modeling. We analyzed the relationship between species richness across multiple higher taxa observed at 526 sites in temperate forests and vegetation indices, measures of aboveground net primary productivity. We downloaded MODIS derived vegetation index time series for each location where the species richness had been sampled, and summarized the data into three measures: maximum time-series value, temporal mean, and temporal variability. On average, species richness covaried positively with our vegetation index measures. Different higher taxa show different positive relationships with vegetation indices. Models had high R2 values, suggesting higher taxon identity and a gradient of vegetation index together explain most of the variation in species richness in our data. MODISTools can be used on Windows, Mac, and Linux platforms, and is available from CRAN and GitHub (https://github.com/seantuck12/MODISTools)
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