On differences in chemical composition between the central and marginal zones of granite veins, with further evidence of exchanges between such veins and the contact rocks

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Preface - \u3ci\u3eContact, Crossover, Continuity\u3c/i\u3e - 1994

The Fourth Biennial Symposium of the Textile Society of America, Inc., was hosted by the Fowler Museum of Cultural History, University of California, Los Angeles, California, September 22–24, 1994. The papers addressed a broad theme which was chosen in order to accommodate the diverse interests of members. The proceedings contains the thirty papers and two abstracts of papers presented at the symposium, plus a video script, and a list of the two hundred and forty participants. Contact, Crossover, Continuity highlights the causes and effects of change on textiles around the world. The proceedings provides an opportunity to identify and evaluate numerous external influences which cause textiles to change. Subsequently, these textiles continue in an altered form, usually with new significance. The transformation process often features creativity which, therefore, becomes an additional theme. The papers address cultures around the world and extend in time from the fourth century B.C. into the future. They include a wide variety of artistic styles, technical structures, and cultural significance. The most common thread in addressing the theme is the role of cloth as communicator. Cloth serves to communicate ethnic identity, personal status and legitimacy as well as personal and political power. Cloth also functions as a visual marker of historical traditions, and even assumes magical qualities. The fabrics and costume items, whether imported or indigenous, undergo change that endows them with a new cultural significance and meaning and affects their appearance, production, or function. Altogether, the variety of factors affecting change, the varied means of and reasons for their assimilation, and their subsequent significance underscore the fundamental importance of cloth

Lecturer Attitudes Towards Teacher Trainees in a New South Wales College - 1955 and 1985

All who have worked in teacher education institutions for any length of time will know that significant changes have occurred in the way in which lecturers relate to their students and the sorts of behaviour which they expect from them. One hears lecturers speak of the good old days , especially when irritated by some particularly liberal student behaviour or some seemingly cavalier student attitude, but it would be unusual to find someone who genuinely believes that the old days were better than the new . It occurred to us that it would be an interesting exercise to look at some of the changes which have taken place in lecturer-student relationships over the years. We have chosen Armidale College of AdYanced Education as the subject of our discussion. simply because of our long association with it. No doubt, peculiarities of this College, especially in its residential aspects, would not apply to some other institutions but we feel that the general trends and directions we discuss will be common to all teacher education institutions in New South Wales and, quite possibly, to others throughout Australia. The year 1955, apart from being a neat thirty years (or one generation) from the present, also has a special significance. Both of us were at the College in that year, one as a lecturer and the other as a student. W\u27e have both been closely associated with it in one way or another ever since and the observations we make are based on first hand experience. In our discussion, we concentrate on four aspects of the past and present functioning of Armidale College. We examine each of these aspects in turn and then try to offer some possible explanations for the changes that have taken place over the last thirty years

Traditional Textiles In Cultural Contexts International Research And Video Documentation

As the manufacture and use of traditional hand-made textiles in their cultural contexts decreases around the world, we are trying to preserve some of the information for posterity through publication and video documentation. The work is urgent. The comparatively few age-old traditions that still survive have become the equivalent of endangered species. Although the size and scope of each documentation project will vary according to what survives, three collaborative results are sought based on research and fieldwork. Each fulfills a distinct educational purpose and informs specific audiences, both scholars and the general public. Each will also increase the understanding of the critical role of the fabric(s) in traditional culture. The first end product is a collaborative publication which will present the current textile practices and place them in broader historical and cultural contexts. It is intended for anyone interested in textiles and the humanities. The two other end products are videos. The use of video is vital for documentary purposes since it records movement that is essential to manufacturing processes and cultural use. Still photos and slides are truly inadequate, as are lengthy verbal descriptions. While researchers will use video during fieldwork, the final videos for distribution will be taken by professionals. The archival video will document patterns, manufacture and use of selected fabrics, from beginning to end, for textile specialists. It will be professionally taped following preplanned shot sequences for maximum clarity and minimal editing. A text with detailed descriptions of the video images in sequence written by the researchers will accompany the archival video for international distribution primarily to research facilities. The documentary video with a narrative script will present the topic in the broadest context for a wider audience and distribution. The length will depend upon the project; some fabrics will be presented in 30 minute stories while others will be shown in 5 minute clips. Most of this video will be taken from the archival video with about 20 percent additional footage shot for broader cultural contexts

Designing for Safety:Implications of a Fifteen Year Review of Swallowed and Aspirated Dentures

Objectives: Dentures are worn by around 20% of the population, yet if they become displaced they may enter the gastrointestinal or respiratory system, sometimes with grave consequences. The aim of this study was to review recent published literature in order to identify the epidemiology of patients and characteristics of swallowed and aspirated dental prostheses, and propose strategies to minimise these risks. Material and Methods: A fifteen year retrospective of published case series and case reports was carried out. Photographs, radiographs and descriptions of the dental prostheses were gathered, as well as the patient’s presenting complaint, the anatomical site where the denture was caught and the procedure required to remove the denture. Results: Ninety one separate events of swallowed or aspirated dentures were identified from 83 case reports and series from 28 countries. Average age was 55 years, and these were 74% male. Photographs were retrieved for 49 of these dentures. Clasps were present in 25 of the dentures. There was no significant difference between clasped and unclasped dentures for perforation rates, need for open surgery and spontaneously passed dentures. Conclusions: We discuss the implications of this study regarding denture designs, specifically the importance of using a radiopaque acrylic, using clasps when required even if there is a risk of aspiration, advising patients to return if a denture is loose or damaged, and finally that all patients who wear a denture are at risk of aspiration and swallowing events, and associated morbidity and mortality

Collective molecule formation in a degenerate Fermi gas via a Feshbach resonance

We model collisionless collective conversion of a degenerate Fermi gas into bosonic molecules via a Feshbach resonance, treating the bosonic molecules as a classical field and seeding the pairing amplitudes with random phases. A dynamical instability of the Fermi sea against association into molecules initiates the conversion. The model qualitatively reproduces several experimental observations {[Regal et al., Nature {\bf 424}, 47 (2003)]}. We predict that the initial temperature of the Fermi gas sets the limit for the efficiency of atom-molecule conversion.Comment: 4 pages, 3 figures, 10+ references, accepted to PR

Zebra Mussel Infestation of Unionid Bivalves (Unionidae) in North America

In 1989, zebra mussels received national attention in North America when they reached densities exceeding 750,000/m2 in a water withdrawal facility along the shore of western Lake Erie of the Laurentian Great Lakes. Although water withdrawal problems caused by zebra mussels have been of immediate concern, ecological impacts attributed to mussels are likely to be the more important long-term issue for surface waters in North America. To date, the epizoic colonization (i.e., infestation) of unionid bivalve mollusks by zebra mussels has caused the most direct and severe ecological impact. Infestation of and resulting impacts caused by zebra mussels on unionids in the Great Lakes began in 1988. By 1990, mortality of unionids was occurring at some locations; by 1991, extant populations of unionids in western Lake Erie were nearly extirpated; by 1992, unionid populations in the southern half of Lake St. Clair were extirpated; by 1993, unionids in widely separated geographic areas of the Great Lakes and the Mississippi River showed high mortality due to mussel infestation. All infested unionid species in the Great Lakes (23) have become infested and exhibited mortality within two to four years after heavy infestation began. Data indicate that mean zebra mussel densities \u3e5,000-6,000/m2 and infestation intensities \u3e100-200/unionid in the presence of heavy zebra mussel recruitment results in near total mortality of unionids. At present, all unionid species in rivers, streams, and lakes that sympatrically occur with zebra mussels have been infested and, in many locations, negatively impacted by zebra mussels. We do not know the potential consequences of infestation on the 297 unionid species found in North America, but believe zebra mussels pose an immediate threat to the abundance and diversity of unionids

HfC(310) High Brightness Sources for Advanced Imaging Applications

The authors report on electron emission from HfC(310) operating in extended Schottky emission mode. Data are gathered from test stands as well as through operation in a commercial scanning electron microscope. Emitter end-form geometry consisted of rounded, via electrochemical etching, and truncated, via ion milling. The authors demonstrate high angular intensity operation of \u3e60 mA/sr especially for the rounded end-form emitters. Advantages include robustness of the material, which is not reliant on material supply as is the case with standard ZrO/W(100) sources. Hence, operation is available over a much larger range of temperatures, fields, and potentially pressures. Operation in a commercial scanning electron microscope gave ten times higher beam currents for identical operational parameters over a standard Schottky source