9,474 research outputs found
The Role of Evidence in Establishing Trust in Repositories
No full textThis article arises from work by the Digital Curation Centre (DCC) Working Group examining mechanisms to roll out audit and certification services for digital repositories in the United Kingdom. Our attempt to develop a program for applying audit and certification processes and tools took as its starting point the RLG-NARA Audit Checklist for Certifying Digital Repositories. Our intention was to appraise critically the checklist and conceive a means of applying its mechanics within a diverse range of repository environments. We were struck by the realization that while a great deal of effort has been invested in determining the characteristics of a 'trusted digital repository', far less effort has concentrated on the ways in which the presence of the attributes can be demonstrated and their qualities measured. With this in mind we sought to explore the role of evidence within the certification process, and to identify examples of the types of evidence (e.g., documentary, observational, and testimonial) that might be desirable during the course of a repository audit.
Chabrelle D. Williams, soprano, Friday, February 22, 2013
No full textIn partial fulfillment of the requirements for the degree of
Master of Musi
Guide to MS258 Sister Aloysius Williams collection
No full textSister Aloysius Williams (d. July 11, 2003) was a nurse, a member of the Daughters of Charity Order in St. Louis, and a longtime administrator of the Hotel Dieu School of Nursing in El Paso. The collection dates 1887 – 1991, bulk 1940s – 1970s and consists of materials from the Hotel Dieu School of Nursing and the personal papers of Sister Aloysius Williams
Effect of magnetostatic interactions on the hysteresis parameters of single-domain and psuedo-single domain grains
No full textFrom experiments it is known that magnetostatic interactions between grains strongly affect the magnetic behavior of samples. However, because of the difficulty in predicting the nonlinear behavior, the effect of interactions has been largely ignored from theoretical models. Instead models are often based on noninteracting assemblages. This approximation is valid for certain natural systems, but there are many cases where interactions are known to be important, for example, bacterial magnetosomes found in sedimentary rocks. Using a three-dimensional micromagnetic model, we have conducted a detailed study of the role of magnetostatic interactions on the magnetic properties of assemblages of ideal single domain (SD) grains and cubic grains between 30–250 nm in size. We quantify the contribution of interactions to hysteresis parameters and the Day plot. We show that interactions can strongly affect the magnetic characteristics of a grain assemblage. For example, assemblages of interacting SD grains can plot in the traditional multidomain (MD) area of the Day plot. For grains >100 nm in size, interactions can have the opposite effect, and can cause the hysteresis parameters to shift toward the SD region of the Day plot. In addition to varying grain size, we have also considered various anisotropies, e.g., uniaxial and cubic, and the importance of the alignment configuration of the particle assemblages, i.e., randomly distributed or aligned. It is shown that for assemblages of aligned magnetite particles, that as the interaction spacing is decreased, the SD/MD transition size increases, which may explain why some magnetotatic bacteria possess aligned grains of magnetite above the traditional transition size value of 70 nm. By aligning the anisotropies, the grains become stable SD, and having larger crystals will increase the magnetic signal
Age, geographical distribution and taphonomy of an unusual occurrence of mummified crabeater seals on James Ross Island, Antarctica
No full textAn unusually dense collection of some 150 dead crabeater seals (Family Phocidae), in various stages of decay, occurs in the Brandy Bay hinterland, north-western James Ross Island, northern Antarctic Peninsula. Throughout the past 100 years, the presence of shelf ice (no longer present today) and sea ice in Prince Gustav Channel, between James Ross Island and the Antarctic Peninsula, has prevented seals from readily accessing the western side of James Ross Island. However, open water pools, some over one kilometre in diameter, remain accessible throughout the winter months, allowing seals to haul out onto the ice. It is likely that some of these seals may become disorientated as they wander away from the pools and instead head toward Brandy Bay and onto low-lying and snow-covered Abernethy Flats, easily mistaken for sea ice in early winter, where they perish. The large number of variably-decayed animals present suggests that this has probably happened on numerous occasions. However, some of the dead seals also probably perished during a documented mass dying event of crabeater seals in Prince Gustav Channel caused by an unidentified epidemic, possibly phocine distemper virus (PDV), during the spring of 1955
John T. Ames to Dr. John D. Williams, 20 September 1962
No full textAmes asks Williams to do all he can to prevent Governor Ross Barnett from closing the unversity.https://egrove.olemiss.edu/west_union_um/1025/thumbnail.jp
Brazos : an historical novel of the Southwest, 1876-1885
No full textAt head of title: By Ross McLaury Taylor.Lined out and autographed.Thesis (PH. D.)--University of Iowa, 1938.Without thesis note.Inscribed: To Michael Heaston, friend, compatriot & fellow student, Ross McL. Taylor.Municipal University of Wichita faculty author
Induction of programmed cell death in mammalian cells by isolates of Ross River virus
No full textArthritogenic alphaviruses, such as Ross River virus (RRV) are associated with worldwide outbreaks of human polyarthritis/arthralgia. The pathogenesis of RRV and other alphaviruses is poorly understood. Studies have shown potential links between the different strains of RRV and variation in their pathogenesis and virulence. Currently there is believed to be two circulating strains of RRV, the south western (SW) from the south west region of Western Australia and the north eastern (NE) from the east coast of Australia. Studies have suggested that the persistence of RRV may be the result of an impaired immune response. This study was designed to determine if the SW and NE isolates of RRV have the ability to induce apoptosis in DCs and fibroblasts and discover any possible variation in their apoptosis-inducing capacity. Both Vero cells and murine bone marrow DCs (BMDCs) were infected with the SW74249 (SW) and SW82627 (NE) strains of RRV. A time course analysis of two apoptotic markers and a cell viability marker for both cell types was conducted by flow cytometry. The results indicate RRV- induced apoptosis in both Vero cells and BMDCs, with RRV inducing a stronger pro-apoptotic response in BMDCs than Vero cells, 24 h after infection. Between the two strains there was little variation in the Vero cells over time. In the BMDCs there was some variation with the RRV-SW strain inducing a higher percentage of cell death than the RRV-NE strain, 24 h after infection. Collectively, the data indicates that RRV has the capacity to induce a pro-apoptotic response in DCs, with the SW presenting as more aggressive compared to the NE, potentially leading to greater virulence. This data could help to explain the mechanism of RRV persistence in vertebrate hosts, as well as the reported differences in severity and duration of human clinical symptoms. Immunotherapy aimed at correcting the patient’s dysfunctional immune system, may represent a new strategy for the successful medical treatment of RRV infection
A gravitational redshift determination of the mean mass of white dwarfs. DA stars.
No full texttextWe measure apparent velocities (v_app) of the H alpha and H beta Balmer line cores for 449 non-binary thin disk normal DA white dwarfs (WDs) using optical spectra taken for the European Southern Observatory SN Ia progenitor survey (SPY). Assuming these WDs are nearby and comoving, we correct our velocities to the local standard of rest so that the remaining stellar motions are random. By averaging over the sample, we are left with the mean gravitational redshift, <v_g>: we find <v_g> = <v_app> = 32.57+/-1.17 km/s. Using the mass-radius relation from evolutionary models, this translates to a mean mass of 0.647+0.013-0.014 Msun. We interpret this as the mean mass for all DAs. Our results are in agreement with previous gravitational redshift studies but are significantly higher than all previous spectroscopic determinations except the recent findings of Tremblay & Bergeron. Since the gravitational redshift method is independent of surface gravity from atmosphere models, we investigate the mean mass of DAs with spectroscopic Teff both above and below 12,000 K; fits to line profiles give a rapid increase in the mean mass with decreasing Teff. Our results are consistent with no significant change in mean mass: <M>^hot = 0.640+/-0.014 Msun and <M>^cool = 0.686+0.035-0.039 Msun.Astronom
A social scientific framework for social systems in online video games: Building a better looking for raid loot system in World of Warcraft
No full textThis paper examines social behavior in the online video game World of Warcraft. Specifically focusing on one element of social design: the behavior of players in the first release of Looking-for-Raid (LFR) loot system of World of Warcraft. It uses lens of economic game theory, combined with Williams (2010) mapping principle and a modern theoretical account of human decision-making, to explore how theory about individual interactions in well-defined contexts (games) can explain collective behavior. It provides some support for this theoretical approach with an examination of data collected as part of an ethnographic study, through focus groups, and a survey distributed to 333 World of Warcraft players. It concludes with a discussion of the results and some guidelines for predicting collective outcomes in certain types of online games using the introduced framework. © 2014 Elsevier Ltd. All rights reserved
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