2,091,541 research outputs found
Smart Light Fields
No full textSmart Light Fields is a live mapping of the movement of Smart Light Sydney festival-goers across Circular Quay. Also exhibited in the Creative Sydney Festival, Museum of Contemporary Art, Sydney. May 27-June 12, 2009
Subjective responses to different light sources. A study on light preferences and comparison of standard light measures with human individual estimates
No full textThe experimental research here described investigates how people perceive different light sources that
have same CCTs and illuminance values on a visual task. The results show that photometric quantities
like illuminances and CCTs fail to guarantee users comfort, because parameters like SPD of the light
source and its technology heavily influence people‘s perception of an environment
Family rituals and the potential for interaction design : a study of Christmas
No full textDrawing on a field study with eight families in northern England, we explore the traditions and rituals carried out at Christmas, looking at the artefacts and processes that constitute family life at this time of year. Besides individual differences, a common pattern emerges: an extended preparation is carried out by the hosting household over a few weeks to set up the celebration and build expectations; preparation gives way to a short but intense celebration shared with the family or intimate friends; then decorations are stored and there is a return to normal life. The celebration is across generations and everyone takes part. We note examples of new and evolving rituals. Starting from the three identified phases, we discuss the theoretical and technical implications of our findings for the design of more sympathetic technology that holds potential for augmenting family rituals sensitively and possibly creating new ones
Light Focusing and Additive Manufacturing Through Highly Scattering Media Using Upconversion Nanoparticles
No full textLight-based additive manufacturing holds great potential in the field of bioprinting due to its exceptional spatial resolution, enabling the reconstruction of intricate tissue structures. However, printing through biological tissues is severely limited due to the strong optical scattering within the tissues. The propagation of light is scrambled to form random speckle patterns, making it impossible to print features at the diffraction-limited size with conventional printing approaches. The poor tissue penetration depth of ultra-violet or blue light, which is commonly used to trigger photopolymerization, further limits the fabrication of high cell-density tissue constructs. Recently, several strategies based on wavefront shaping have been developed to manipulate the light and refocus it inside scattering media to a diffraction-limited spot. In this study, we present a high-resolution additive manufacturing technique using upconversion nanoparticles and a wavefront shaping method that does not require measurement from an invasive detector, i.e., it is a non-invasive technique. Upconversion nanoparticles convert near-infrared light to ultraviolet and visible light. The ultraviolet light serves as a light source for photopolymerization and the visible light as a guide star for digital light shaping. The incident light pattern is manipulated using the feedback information of the guide star to focus light through the tissue. In this way, we experimentally demonstrate that near-infrared light can be non-invasively focused through a strongly scattering medium. By exploiting the optical memory effect, we further demonstrate micro-meter resolution additive manufacturing through highly scattering media such as a 300-mu m-thick chicken breast. This study provides a concept of high-resolution additive manufacturing through turbid media with potential application in tissue engineering.LAP
Surface plasmon polariton modification in top-emitting organic light-emitting diodes for enhanced light outcoupling
No full textWe report on the enhanced light outcoupling efficiency of monochrome top-emitting organic light-emitting diodes (OLEDs). These OLEDs incorporate a hole transport layer (HTL) material with a substantially lower refractive index (∼ 1:5) than the emitter material or the standard HTL material (∼ 1:8) of a reference device. This low-index HTL is situated between the opaque bottom metal contact (anode) and the active emission layer. Compared to an HTL with common refractive index, the dispersion relation of the surface plasmon polariton (SPP) mode from the opaque metal contact is shifted to smaller in-plane wavenumbers. This shift enhances the outcoupling efficiency as it reduces the total dissipated power of the emitter. Furthermore, the excitation of the coupled SPPs at the thin transparent metal top contact (cathode) is avoided by using an ultrathin top electrode. Hence, the coupling of the electroluminescence from the emitter molecules to all non-radiative evanescent modes, with respect to the emitter material, is reduced by at least a factor of two, additionally increasing the outcoupling efficiency. Furthermore, for sufficiently high refractive index contrast the shift of the SPP at the anode/organic interface can lead to in-plane wavenumbers smaller than the wavenumber within the organic emitter layer and outcoupling of all excited modes by high index light extraction structures, e.g. microlens, seems feasible. In accordance to optical simulations, the external quantum efficiency is enhanced by about 20% for monochrome green emitting OLEDs with low refractive index HTL compared to a reference sample
Other Anniversaries celebrated during the International Year of Light 2015
No full textAs we all no doubt know 2015 has been chosen to be “The International Year of Light and Light-based Technologies” because the anniversaries of a series of outstanding achievements in the history of the science of light are commemorated this year. One thousand years ago, in 1015, Alhazen published his works on optics. Two hundred years ago, in 1815, Fresnel proposed his notion of light as a wave and in 1865 Maxwell developed the electromagnetic theory of light, thereby unifying light, electricity and magnetism through “Maxwell’s synthesis”. Einstein explained the photoelectric effect in terms of quanta of light in 1905 and a century ago, in 1915, light was embedded in cosmology through his general relativity theory. Fifty years ago in 1965, Penzias and Wilson discovered the cosmic microwave background, an echo of the origin of the universe and evidence of the Big Bang, while 1965 was also the year of Kao’s achievements concerning the transmission of light in optic fibres, which formed the basis of today’s ubiquitous optical communication. However, there are many other achievements related to light and its technologies, perhaps not as important as those above but which are also worthy of mention. With this in mind I decided to write this article. My first thought was to find other important achievements in the science and technology of light in the same years: 1015, 1815, 1865, 1905, 1915 and 1965. However, I immediately ruled out 1015 and chose the year 1665 instead, that is 350 years ago. In the case of 1965, I also set out to find two achievements similar to those mentioned above: an accidental discovery like the cosmic microwave background and a technological achievement like optical fibres. Below is my list of these “other anniversaries”
Dynamics of finite-sized light spheres in turbulence
No full textWe report experimental results on the Lagrangian dynamics of finite-size light particles in turbulence. Using an orthogonal camera setup and 3D particle tracking, we study the velocity and acceleration statistics of rigid light spheres in a water tunnel with nearly homogeneous and isotropic turbulence. The Reynolds number (ReY) is varied from 180 to 300, and the study covers a range of size ratios (4 < D/η < 16) for marginally light spheres. We find that the normalised acceleration PDF decreases in intermittency with increasing size ratio - in qualitative agreement with the predictions of the Faxén corrected model. We also present preliminary results on the rotational dynamics of large light spheres in turbulence
Interview with Dr. Michael C. Keith (Communication Department), author Of Night and Light: Stories (Blue Mustang Press, 2012)
No full textDr. Keith's latest book is a collection of shorts stories entitled Of Night and Light. This book collects more than 40 short stories covering all manner of speculative fiction, humor, and even a bit of romance. As the title notes, there are both light and dark themes within the book, though the author readily admits he leans a bit darker at times.Title supplied by cataloger
It’s Not Just a Game: Contemporary Challenges for Games Research and the Internet
No full textIn this final chapter we will raise a number of issues that we have encountered as we have put this collection of papers together. In doing this, we also reflect upon the seven challenges for video game theory that Bernard Perron and Mark Wolf(2009)put forward in the introduction to the second video game theory reader given it is probably one of the most recent assessments in the area at the time of\ud
writing. These challenges are concerned with Terminology and Accuracy, History, Methodology, Technology, Interactivity, Play and the Integration of Interdisciplinary Approaches. These issues will be brought up throughout this chapter, but not necessarily in mutually exclusive fashion..
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