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Search Results: 1 - 10 of 42775 matches for " Christopher Thomas "
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Speckle Reduction in Imaging Projection Systems  [PDF]
Weston Thomas, Christopher Middlebrook
Optics and Photonics Journal (OPJ) , 2012, DOI: 10.4236/opj.2012.24042

Diffractive diffusers (phase gratings) are routinely used for homogenizing and beam shaping for laser beam applications. Another use for diffractive diffusers is in the reduction of speckle for pico-projection systems. While diffusers are unable to completely eliminate speckle they can be utilized to decrease the resultant contrast to provide a more visually acceptable image. Research has been conducted to quantify and measure the diffusers overall ability in speckle reduction. A theoretical Fourier optics model is used to provide the diffuser’s stationary and in-motion performance in terms of the resultant contrast level. Contrast measurements of two diffractive diffusers are calculated theoretically and compared with experimental results. Having a working theoretical model to accurately predict the performance of the diffractive diffuser allows for the verification of new diffuser designs specifically for pico-projection system applications.

The crucial role of CLEO-c in the measurement of gamma
Christopher Thomas
Physics , 2009,
Abstract: The most sensitive method to measure the CKM angle gamma is to exploit interference in B(+/-)->DK(+/-) decays, with the D-meson decaying to a hadronic final state. The analysis of quantum-correlated decays of the psi(3770) at CLEO-c provides invaluable information on the strong-phase difference between the D0 and D0bar across the Dalitz plane. Results from analyses of the decays D->K0PiPi and D->K0KK will be presented.
Senescence Is More Important in the Natural Lives of Long- Than Short-Lived Mammals
Christopher Turbill,Thomas Ruf
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0012019
Abstract: Senescence has been widely detected among mammals, but its importance to fitness in wild populations remains controversial. According to evolutionary theories, senescence occurs at an age when selection is relatively weak, which in mammals can be predicted by adult survival rates. However, a recent analysis of senescence rates found more age-dependent mortalities in natural populations of longer lived mammal species. This has important implications to ageing research and for understanding the ecological relevance of senescence, yet so far these have not been widely appreciated. We re-address this question by comparing the mean and maximum life span of 125 mammal species. Specifically, we test the hypothesis that senescence occurs at a younger age relative to the mean natural life span in longer lived species.
"Motorcycle Clubs in Britain During the Interwar Period, 1919 – 1939: Their Social and Cultural Importance"
Christopher Thomas Potter
International Journal of Motorcycle Studies , 2005,
Abstract: Motorcycle clubs were and remain an important part of the motorcycling scene, primarily for their unifying aspects, as a means of indulging in social and sporting functions, and as forums for the interchange of ideas regarding technical problems. This essay explores the phenomenon of clubs using the primary source of contemporary technical journals such as The Motor Cycle and Motor Cycling, and the secondary source of the few related modern texts on the social and cultural aspects of motoring. It goes into detail regarding club activities, the usefulness of such clubs for the individual motorcyclist, and shows the increasing need to become politically aware in the light of government legislation. The relationship between clubs and their governing body, the Auto Cycle Union, is explored, as is their influence on the industry. The overall picture is of a thriving pastime, socially acceptable to the majority and undertaken by an enthusiastic cross-section of society.
Motorcycling "Types": An Exploration of Some Motorcyclists in 1920s Britain
Christopher Thomas Potter
International Journal of Motorcycle Studies , 2010,
Antagonist Characters in the Early Gothic Novel: A Matter Of Political Anxiety? = Erken D nem Gotik Romanlar nda Kar t Karakterler
Christopher Thomas CAIRNEY
Dogus University Journal , 2001,
Abstract: During the eighteenth-century, the antagonist, previously the second most important character in a story, becomes, first in Richardson's Clarissa, and then under Gothic influence, the main character in the novel. This recalls the “heavy” villain of Elizabethan drama. The use to which the character is put by the author is both consciously and unconsciously political or ideological, at least in part. Under political influence, the antagonist can be classified as either “repentant” or “unrepentant,” with very different effects, as a New Historicist or Cultural Materialist analysis can reveal. The Gothic antagonist is set within the Gothic novel, and together with other conventions of the Gothic novel became the basis of later interpretations of the Gothic impulse in novels of various sub-genres, from oriental fiction and science fiction to the modern romance novel.
Quotients of Koszul algebras and 2-d-determined algebras
Thomas Cassidy,Christopher Phan
Mathematics , 2012,
Abstract: Vatne and Green & Marcos have independently studied the Koszul-like homological properties of graded algebras that have defining relations in degree 2 and exactly one other degree. We contrast these two approaches, answer two questions posed by Green & Marcos, and find conditions that imply the corresponding Yoneda algebras are generated in the lowest possible degrees.
Thin monodromy in Sp(4)
Christopher Brav,Hugh Thomas
Mathematics , 2012, DOI: 10.1112/S0010437X13007550
Abstract: We show that some hypergeometric monodromy groups in Sp(4,Z) split as free or amalgamated products and hence by cohomological considerations give examples of Zariski dense, non-arithmetic monodromy groups of real rank 2. In particular, we show that the monodromy of the natural quotient of the Dwork family of quintic threefolds in P^{4} splits as Z*Z/5. As a consequence, for a smooth quintic threefold X we show that a certain group of autoequivalences of the bounded derived category of coherent sheaves is an Artin group of dihedral type.
Braid groups and Kleinian singularities
Christopher Brav,Hugh Thomas
Mathematics , 2009,
Abstract: We establish faithfulness of braid group actions generated by twists along an ADE configuration of $2$-spherical objects in a derived category. Our major tool is the Garside structure on braid groups of type ADE. This faithfulness result provides the missing ingredient in Bridgeland's description of a space of stability conditions associated to a Kleinian singularity.
Seeing Behind the Camera: Identifying the Authorship of a Photograph
Christopher Thomas,Adriana Kovashka
Computer Science , 2015,
Abstract: We introduce the novel problem of identifying the photographer behind the photograph. To explore the feasibility of current computer vision techniques to address this problem, we created a new dataset of over 180,000 images taken by 41 well-known photographers. Using this dataset, we examined the effectiveness of a variety of features (low and high-level, including CNN features) at identifying the photographer. We also trained a new deep convolutional neural network for this task. Our results show that high-level features greatly outperform low-level features at this task. We provide qualitative results using these learned models that give insight into our method's ability to distinguish between photographers, allow us to draw interesting conclusions about what specific photographers shoot, and demonstrate two applications of our method.
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