78 research outputs found
Douglas Frank Twiss 1883–1951
No full textAbstract
Among the celebrated names of those who have contributed so much in the last thirty years to rubber technology is that of Douglas Frank Twiss. Born in Birmingham, England, in 1883, he graduated at Birmingham University and received the Doctor of Science degree in 1910. Among other academic qualifications, he was a Bachelor of Science of London University and became a Fellow of the Royal Institute of Chemistry in 1908, on whose Council he served for nine years. He was also one of the pioneer members of the Institution of the Rubber Industry at its inception in 1921, and in 1934 he received the highest honor the Institution awards—the Colwyn Gold Medal—for his outstanding scientific work in rubber technology. During the long and active part he played in the British rubber industry, he served on various committees of the Research Association of British Rubber Manufacturers and the Institution of the Rubber Industry. Dr. Twiss's first appointment was as a lecturer in chemistry at the Birmingham College of Technology until 1914, when he joined the Dunlop Rubber Company to form a Chemical Research Department. Within a year he was appointed Chief Chemist, a position he held until his retirement in 1946. Some idea of his wide and varied interests can be obtained from over seventy scientific publications and two hundred patent specifications bearing his name and sometimes those of his fellow workers. He was also part author of a text book on practical organic chemistry and two volumes on inorganic chemistry dealing with oxygen and sulfur, and he served for many years as Special Editor in rubber and elastomers for British Abstracts.</jats:p
The Colorado Trust’s Healthy Communities Initiative: Results and Lessons for Comprehensive Community Initiatives
Get PDF· This article summarizes how 29 diverse communities throughout Colorado implemented the Colorado Healthy Communities Initiative (CHCI), which was conceived and funded by The Colorado Trust to engage community residents in the development of locally relevant strategies to improve community health.
· In line with the World Health Organization’s Healthy Cities model, CHCI emphasized (a) inclusive, representative planning; (b) a broad definition of “health”; (c) consensus decision making; and (d) capacity building among local stakeholder groups.
· Communities implemented an array of projects (on average, six per community) that extended well beyond traditional health promotion and disease prevention. The most common action projects focused on community problem solving, civic engagement, and youth development. Many of the grantees established projects or new institutions that had a long-term community impact.
· Key success factors for CHCI included (a) a wellspecified planning model, (b) a planning process facilitated by expert consultants, (c) a unifying “healthy community” vision developed at the beginning of the process by diverse stakeholders, (d) a willingness by stakeholders to work collaboratively to define “key performance areas” and then to implement “action projects” to achieve them, and (e) an appropriate level of funding for implementation ($50,000 per site per year).
· The outcomes and impacts of CHCI might have been improved by better anticipating the requirements for sustaining the energy and work initiated during the planning process.
· At the end of the initiative, CHCI provided the funders with a broader, deeper understanding of the requirements, opportunities, and realities associated with promoting “community health.
Quantum astronomy: Scientific background, technologies, achieved results, and future developments
No full textQuantum technologies have been introduced widely in different scientific fields and some industry application have been
developed. In this work we outline the history and development of a new field of Astronomy which is based on the
concept of quantum mechanics and takes advantage from the technological instruments developed recently for quantum
information in order to investigate new properties of the light coming from the sky. The development of this Quantum
Astronomy instruments is still very active (e.g. Adaptive Optics integration) and the scientific target is pushed to new
exiting limits: for example, periodic optical monitor of pulsars, lunar occultation; transit-occultations and application of
the Hanbury Brown Twiss Intensity Interferometry
Phase-Matched Emission from Rydberg Atoms Confined in a State-Insensitive Trap: Long-Lived Coherence, Hyperfine Level Measurements, and Hanbury Brown-Twiss Interference
Get PDFRydberg ensembles have many diverse and important applications for quantum information and quantum optics. For example, Rydberg ensembles can generate non-classical states of light which would be useful in a quantum network, and they could be used as qubits in a future quantum computer. For this reason, this thesis will present investigations of light-matter interactions in Rydberg ensembles.
Non-classical states of light, such as single-photon states, are important for many quantum communication protocols. We have performed an experiment that demonstrates the generation of single-photon states from a Rydberg ensemble. We then studied the second-order correlations between this single-photon state of light and an incident coherent field. Under these conditions, we observed Hanbury Brown Twiss interference between the emission from a driven super-atom and a coherent field in the absence of stimulated emission.
For a universal quantum computing architecture, coherence times must be much longer than gate operations. We observe ground-Rydberg coherence times in excess of 20 microseconds by using a "magic-wavelength" optical lattice to confine the atoms. Using this coherence time, we measured the differential nuclear-spin-dependent light shifts for principal quantum numbers, n, between n = 30 and n = 65, which is relevant for future high-fidelity Rydberg qubits in optical potentials. Also, we measured the hyperfine constant for atomic Rb to be 35.71 GHz with an uncertainty of 0.18 GHz.PhDPhysicsUniversity of Michigan, Horace H. Rackham School of Graduate Studieshttps://deepblue.lib.umich.edu/bitstream/2027.42/155048/1/jlampen_1.pd
Childhood bronchiectasis: national incidence, disease progression and an evaluation of inhaled antibiotic therapy
No full textBackground: Bronchiectasis is a chronic suppurative lung disease, defined by dilatation of
bronchial airways, resulting in significant morbidity, mortality, and healthcare expenditure. It
continues to affect large numbers of people worldwide, particularly indigenous or disadvantaged
communities. The goals of this thesis were to determine childhood bronchiectasis occurrence in
New Zealand, define its progression, and evaluate a potential new therapy; inhaled antibiotics.
Methods: Firstly, a single-centre retrospective study described the prevalence, aetiology and
severity of childhood bronchiectasis in Auckland. Secondly, a two year prospective multi-centre
study described the incidence, aetiology and severity of new cases of bronchiectasis in New
Zealand. Thirdly, disease progression was estimated through retrospective linear mixed-model
analyses of pulmonary function and compared to peers with cystic fibrosis. Fourthly, an
evaluation of inhaled gentamicin pharmacokinetics was made through a single-dose open-label
study. Finally, a randomised double-blinded placebo-controlled two-period community-based
crossover trial of inhaled antibiotics was conducted.
Results: Children identified had severe, extensive bronchiectasis with an Auckland prevalence
of 1:3000 and a national incidence of 3.7:100,000 per year. Compared with New Zealand
children of European ethnicity, the incidence was 12 times higher in Pasifika and 3 times higher
in Maori. Pneumonia, poverty, immunodeficiency, aspiration and recent immunosuppressive
therapy were the most important aetiologies. Children with bronchiectasis had more severe
obstructive lung disease than peers with cystic fibrosis (FEV1 intercept at ten years age 63%
versus 77% predicted, p<0.001) but declined more slowly (-0.9% versus -2.5% predicted per
annum, p=0.02). Inhaled gentamicin (80mg) safely achieved target concentrations within
sputum (mean 697 μg/g). Despite low adherence, inhaled gentamicin was well tolerated,
resulted in reduced symptoms, decreased Haemophilus influenzae density (-2.7 log10 cfu/ml,
p<0.001), decreased airway inflammation (neutrophils, IL-1β, IL-8, TNFα) and reduced oral
antibiotic use (OR 0.19, p<0.001). No significant change in spirometry or hospitalisation rates
occurred over the three months.
Conclusion: Childhood bronchiectasis has a high and increasing prevalence in New Zealand,
especially in Pasifika and Maori. Children have extensive, progressive disease despite ‘standard’
management. Inhaled gentamicin is well tolerated, achieves effective concentrations, improves
symptoms, reduces bacterial load and airway inflammation aswell as oral antibiotic use.
However, low adherence suggests poor acceptability
Travels through Portugal and Spain, in 1772 and 1773
No full textsignatura tipográfica: A-Z4,2A-2Z4, 3A-3O4Incluye un apéndice con los itinerariosCopia digita
The Jacob tôledôt and plot: an exploration of narrative continuity in Genesis 37:2-50:26 according to Ricoeurian Mimesis
No full textTeaching Comparative Religious Ethics - A Review Essay
Get PDFThough others have surveyed the different methods in comparative religious ethics, relatively little attention has been given to different approaches to pedagogy (exceptions include Lovin and Reynolds; Juergens-meyer; Twiss). The field of comparative religious ethics has now reached a level of maturity so that there are a variety of ways such courses can be taught. In this review I consider the approaches to comparative religious ethics found in four recent texts by Jacob Neusner, Darrell Fasching and Dell deChant, Regina Wolfe and Christine Gudorf, and Sumner Twiss and Bruce Grelle. In the essay I note the strengths and weaknesses of each text, with special attention given to how the texts might work in the classroom. I then argue that the different texts reflect different understandings of the goal of teaching comparative religious ethics, and I make these goals explicit in order to help teachers decide how they might approach the teaching in this growing field
Literature Review: Courageous Dialogues - Moving Beyond Polarization
Get PDFRural ResilienceCourageous Dialogue
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