Self-induced structure in the current-voltage characteristics of RSQUIDs

Resistive two-junction SQUIDs (RSQUIDs) made from high-temperature superconductors are being developed as narrow-linewidth tunable oscillators in the GHz frequency range. We present here the results of numerical simulation of RSQUIDs of this type. These studies have identified conditions where sub-harmonic steps and other features are apparent in the current-voltage characteristics, driven by the internally-generated heterodyne frequency. The behavior is sensitive to the frequency (set by the voltage across the resistive element in the RSQUID), the temperature and also the loop inductance. We have studied the effects of thermal noise on these features. We also assess how these effects might be observed, and consider how they might affect practical applications of high frequency heterodyne RSQUID oscillators

The structure of some Atlantic islands as deduced from gravity and other geophysical data

Imperial Users onl

Les miasmes, les microbes et les médecines. La diffusion des idées anciennes et nouvelles dans l’Union médicale du Canada : le cas de la fièvre typhoïde (1872-1900)

Les dernières décennies du 19e siècle sont connues comme une période de transition importante dans le monde médicale. Les nouvelles découvertes ont révolutionné la façon de voir et de combattre les maladies. Les microbes, pas les miasmes, furent la cause des maladies, qui furent contrôlé plus avec les mesures sanitaires pour la prévention, que par les traitements miraculeuses. En dépouillant les articles sur la fièvre typhoïde dans la revue l’Union médicale du Canada entre 1872 et 1900 on constate que les médecins acceptaient rapidement quelques innovations importantes. Par contre, en ce qui concerne les innovations où leurs anciennes affirmations furent mises en doute, ou leur popularité auprès de la population mis en péril, certains médecins démontraient une hésitation d’accepter ces avances. Cette étude présente la coexistence des idées nouvelles avec des idées plus anciennes, qui continuaient à être diffusé, parfois des années après des découvertes importantes. Nous verrons comment ils furent finalement gagné aux idées nouvelles.The final decades of the 19th century have become known as a period of important transition in the medical world. New discoveries revolutionized the way diseases were seen and fought. Germs, not miasmas, caused disease and sanitary measures of prevention not miracle treatments controlled them. The articles in l’Union médicale du Canada, from 1872 to 1900 concerning typhoid fever reveal that doctors rapidly accepted some important innovations. However, when it came to innovations refuting their former theories or risking to jeopardize their popularity with the public, certain doctors hesitated to adopt the new theories. This study presents the coexistance of new ideas with the older ideas, which continued to be presented, sometimes years after important discoveries. This paper looks at how they were finally won over to the newer ideas

The Consequences of bilingual and bicultural tensions on the canadian aid programme from 1968 to 1976

Québec Université Laval, Bibliothèque 201

Review of Civilians at the Sharp End: First Canadian Army Civil Affairs in Northwest Europe by David A. Borys

Review of Civilians at the Sharp End: First Canadian Army Civil Affairs in Northwest Europe by David A. Bory

Simulation and measurement of hts josephson heterodyne oscillator

We report continuing investigations into practical applications of the ac Josephson effect as the basis for a voltage-tunable radio-frequency oscillator. We have previously demonstrated experimentally that useful power levels (10 s of nW) and linewidths of a few kHz can be achieved in the heterodyne output from a High-Temperature-Superconducting Resistive SQUID (HTS-RSQUID) operating in the frequency range 1-50 MHz. Those results were achieved with 2-junction R-SQUIDs incorporating current-biased shunt resistors of a few micro-ohms. We have now modified the fabrication procedures, and adjusted the shunt resistors and bias current values so that higher frequencies can be achieved. The Josephson junctions are of step-edge type, rather than the bi-crystal type used in our earlier work. The step-edge technique permits much more flexibility in the geometrical lay-out and utilizes the more cost-effective single-crystal MgO substrates. In the present paper, we report numerical simulations and experimental measurements on these devices in the frequency range up to 2 GHz

Managing chronic widespread pain in primary care : a qualitative study of patient perspectives and implications for treatment delivery

Funding The MUSICIAN trial was supported by an award from Arthritis Research UK, Chesterfield, UK. Grant number: 17292. The funding body approved the design of the study. They played no role in the collection, analysis, and interpretation of data or the writing of the manuscript.Peer reviewedPublisher PD

Treatment expectations but not preference affect outcome in a trial of CBT and exercise for pain

The following are members of the MUSICIAN study team: Gary Macfarlane (Principal Investigator), John McBeth (Investigator), Deborah Symmons (Investigator), Karina Lovell (investigator), Philip Keeley (Investigator), Phil Hannaford (Investigator), Chrysa Gkazinou (Trial manager), Marcus Beasley (Research Assistant), Elizabeth Jones (PhD student), Gordon Prescott (Statistician), and Steve Woby (Investigator). We are grateful to the practices and patients in Aberdeen city and Cheshire, which participated in the study: Carden medical centre, Elmbank medical practice, Great Western Road medical practice, Garthdee medical group, Readesmoor medical group practice, Lawton House surgery, Bollington medical practice, Park Lane surgery. The Scottish Primary Care Research Network facilitated access to patient information at the practices in Aberdeen city. Charlie Stockton was the study manager and Ashraf El-Metwally an Investigator during the setting up and for part of the conduct of the study. John Norrie was originally an investigator of the MUSICIAN study while Director of the Centre for Health Care Randomised Trials (CHART) at the University of Aberdeen. We are grateful for the input of members of the Health Services Research Unit (HSRU) at The University of Aberdeen in the conduct of the study: Alison MacDonald and Gladys McPherson. We are grateful to the project assistants who worked on the survey: Dev Acharya, Jennifer Bannister, Flora Joyce, Michelle Rein., Karen Kane, and Rowan Jasper. Alison Littlewood was responsible for study management at the Cheshire site. Finally, we thank the independent members of the trial steering committee (Professor Matthew Hotopf, Professor Tracey Howe, Professor Martin Underwood) and data monitoring committee (Dr. Marwan Bukhari, Professor Hazel Inskip, Dr. Chris Edwards). Funding details The study was funded by Arthritis Research UK, grant number 17292.Peer reviewedPublisher PD

Technical note: New applications for on-line automated solid phase extraction

This technical note explains the disadvantages of manual solid phase extraction (SPE) techniques and the benefits to be gained with automatic systems. The note reports on a number of general and highly specific applications using the Sample Preparation Unit OSP-2A