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Search Results: 1 - 10 of 842 matches for " Debra Dewhurst "
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Searches for sterile neutrinos using the T2K off-axis near detector
Debra Dewhurst
Physics , 2015,
Abstract: In the last decades, the results from a number of short-baseline neutrino experiments and the reanalysis of previous reactor experiments with updated antineutrino fluxes suggest some incompatibility with the standard three-neutrino model. A possible solution to these anomalies is the existence of neutrinos that do not interact via the electroweak force, known as sterile neutrinos. The existence of sterile neutrinos can be investigated with the T2K Experiment. Here we present a search for the disappearance of electron neutrinos over a baseline of 280 m using the T2K off-axis near detector. The data analysed corresponds to an exposure of $5.9 \times 10^{20}$ protons on target. The region $\sin^2 2 \theta > 0.2$ and $\Delta m^2 > 8~\textrm{eV}^2$ is excluded at 95% CL. We also present an introduction to a new analysis looking for muon neutrino disappearance with the T2K near detector, which is in its early stages but promises to have interesting results in 2015.
Triggering and data acquisition for the Hyper-Kamiokande experiment
Debra Dewhurst
Physics , 2015,
Abstract: Hyper-Kamiokande has been proposed as a next generation neutrino oscillation experiment capable of observing accelerator, atmospheric, solar and astrophysical neutrinos, as well as possible proton decays, providing a rich scientific program. One of the main goals is the study of CP violation in the lepton sector. The Hyper-Kamiokande detector will be an underground water Cherenkov detector with a fiducial mass of 0.56 million metric tons, approximately 25 times larger than that of Super-Kamiokande. With such a large fiducial mass, the Hyper-Kamiokande detector will need a robust trigger and data acquisition system (DAQ) to be sensitive to the physics events of interest. Several UK institutions are participating in the development of the trigger and DAQ. Here we present some of the on going studies from the UK DAQ group.
Transforming Critical Spreadsheets into Web Applications at Zurich Financial
Sebastian Dewhurst
Computer Science , 2010,
Abstract: In the insurance industry, spreadsheets have emerged as an invaluable tool to for product pricing, because it is relatively straightforward to create and maintain complex pricing models using Excel. In fact, Excel is often preferred to "hard-code" whenever there are frequent changes to the calculations and business logic which under-pin the pricing of an insurance product. However, problems arise as soon as spreadsheets are deployed to end-users: version control, security of intellectual property, and ensuring correct usage are obvious issues; frequently, integration with other systems is also a requirement. Zurich Financial Services Group is a leading financial services provider; several possible solutions to these problems have been evaluated, and EASA has been selected as the preferred technology. Other spreadsheet collaboration approaches which were considered include Excel Services, and/or custom-built software; however, EASA has provided clear benefits over these strategies.
Sex Differences in Suicide Incident Characteristics and Circumstances among Older Adults: Surveillance Data from the National Violent Death Reporting System—17 U.S. States, 2007–2009
Debra Karch
International Journal of Environmental Research and Public Health , 2011, DOI: 10.3390/ijerph8083479
Abstract: Each year in the U.S. more than 7,000 adults aged 60 years and older die of suicide and as the population ages, these numbers are expected to increase. While sex is an important predictor of older adult suicide, differences between males and females are often overlooked due to low occurrence, particularly among women. The National Violent Death Reporting System (NVDRS) bridges this gap by providing detailed information on older adult suicide by sex in 17 US states (covering approximately 26% of the U.S. population). NVDRS data for 2007–2009 were used to characterize male (n = 5,004) and female (n = 1,123) suicide decedents aged 60 years and older, including incident characteristics and circumstances precipitating suicide. Stratification of NVDRS data by sex shows significant differences with regard to the presence of antidepressants (19% and 45% respectively), opiates (18%, 37%), and 14 precipitating circumstances concerning mental health, interpersonal problems, life stressors and a history of suicide attempts. No differences were found for alcohol problems, suicide/other death of family or friends, non-criminal legal problems, financial problems, or disclosure of intent to take their own life. The findings of this study demonstrate the value of using comprehensive surveillance data to understand sex-specific suicide circumstances so that opportunities for targeted prevention strategies may be considered.
MUMMIES ON DISPLAY: CONSERVATION CONSIDERATIONS
Meier,Debra;
Chungará (Arica) , 2001, DOI: 10.4067/S0717-73562001000100013
Abstract: for centuries, museums around the world have exhibited human mummified remains. in many instances the remains were placed in the exhibit cases without an initial conservation assessment. over time, the mummified remains decay in their cases without proper maintenance. the end result is total loss of integrity within the materials. often times, museums lack conservation specialists, and exhibition staff not trained in conservation does the maintenance of mummies. these museum personnel need to understand the signs of decomposition so that they can detect early signs of conservation problems for proper maintenance over time. they must also make an initial assessment to prepare and maintain mounts that optimizes the conservation of the material while on display. presented is an overview of a conservation assessment that the exhibition professional should be aware of in exhibiting human mummified remains
The Social Science Information Gateway: putting theory into practice
Debra Hiom
Information Research: an international electronic journal , 1998,
Abstract: The Social Science Information Gateway (SOSIG) was established in 1994 to provide access to networked resources for social science researchers, academics and librarians. This paper discusses issues of quality, access, resource identification and description, that SOSIG has faced in the four years since its establishment. It also reviews the involvement of SOSIG in the European Union's DESIRE project.
專論/開讀者培訓項目的先河:小型學術圖書館內的領導與合作/Debra Lucas | Spearheading Change in a Library Instruction Program: Collaboration and Leadership in a Small Academic Library / Debra Lucas
  Debra Lucas
Journal of Library and Information Science , 2007,
Abstract: When librarians who manage and coordinate Library Instruction programs understand the need for change, they likewise engage in effectively negotiating change. If new and seasoned librarians can efficaciously implement a new initiative, then they will spearhead change. Using the principles of collaboration, library instruction managers can articulate and market their vision to the expansive body of campus constituents and decision makers. Librarians do not always need the formal title to lead collaborative projects and improve services. However, they do need to understand the principles of collaboration and leadership. Leading change within an academic library includes spearheading change within the college’s academic departments. This process is difficult at best because academic policy change moves at a snail’s pace. Librarians who want to be collaborative leaders need to be dedicated, educated in understanding organizational culture, and ready to become change agents. This article discusses the author’s experience with using principles of collaboration and leadership to improve the existing library instruction program. 頁次:4-8
Adaptive Technologies for Individuals with Visual Impairments: Scholarly and Consumer Perspectives
Debra Mann
Dalhousie Journal of Interdisciplinary Management , 2010, DOI: 10.5931/djim.v2i1.19
Abstract: Adaptive technologies allow people with visual impairments to access information, but problems surrounding access and availability to these technologies exist. Scholarly literature and reports by organizations, such as the Canadian National Institute for the Blind and the Canadian Library Association, have recognized and discussed these problems and the strategies to overcome them. Libraries are among the organizations that are making adaptive technologies more widely available to consumers. A number of adaptive technologies are discussed.
MUMMIES ON DISPLAY: CONSERVATION CONSIDERATIONS
Debra Meier
Chungará (Arica) - Revista de Antropología Chilena , 2001,
Abstract: For centuries, museums around the world have exhibited human mummified remains. In many instances the remains were placed in the exhibit cases without an initial conservation assessment. Over time, the mummified remains decay in their cases without proper maintenance. The end result is total loss of integrity within the materials. Often times, museums lack conservation specialists, and exhibition staff not trained in conservation does the maintenance of mummies. These museum personnel need to understand the signs of decomposition so that they can detect early signs of conservation problems for proper maintenance over time. They must also make an initial assessment to prepare and maintain mounts that optimizes the conservation of the material while on display. Presented is an overview of a conservation assessment that the exhibition professional should be aware of in exhibiting human mummified remains Por siglos, los museos alrededor del mundo han exhibido restos humanos momificados. En muchos casos, los restos fueron colocados en vitrinas sin una evaluación inicial del estado de conservación. A través del tiempo, los restos momificados se deterioran en sus vitrinas sin contar con la mantención apropiada, cuyo resultado final es la pérdida de la integridad de estos materiales. Muchas veces les falta a los museos personal entrenado en conservación. El personal del museo debe estar atento a los problemas de conservación , a objeto de implementar una mantención apropiada a través del tiempo. También debe hacer una evaluación inicial para preparar y mantener montajes que optimicen al máximo la conservación de los materiales en la vitrina. Se presenta una revisión general de la evaluación de conservación con la que un profesional debe familiarizarse cuando exhibe restos humanos momificados
Relative Critical Points
Debra Lewis
Mathematics , 2012, DOI: 10.3842/SIGMA.2013.038
Abstract: Relative equilibria of Lagrangian and Hamiltonian systems with symmetry are critical points of appropriate scalar functions parametrized by the Lie algebra (or its dual) of the symmetry group. Setting aside the structures - symplectic, Poisson, or variational - generating dynamical systems from such functions highlights the common features of their construction and analysis, and supports the construction of analogous functions in non-Hamiltonian settings. If the symmetry group is nonabelian, the functions are invariant only with respect to the isotropy subgroup of the given parameter value. Replacing the parametrized family of functions with a single function on the product manifold and extending the action using the (co)adjoint action on the algebra or its dual yields a fully invariant function. An invariant map can be used to reverse the usual perspective: rather than selecting a parametrized family of functions and finding their critical points, conditions under which functions will be critical on specific orbits, typically distinguished by isotropy class, can be derived. This strategy is illustrated using several well-known mechanical systems - the Lagrange top, the double spherical pendulum, the free rigid body, and the Riemann ellipsoids - and generalizations of these systems.
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