| 1. |
- Åkesson, Torsten, et al.
(författare)
-
ATLAS Transition Radiation Tracker test-beam results
- 2004
-
Ingår i: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. - : Elsevier BV. - 0168-9002. ; 522:1-2, s. 50-55
-
Konferensbidrag (refereegranskat)abstract
- Several prototypes of the Transition Radiation Tracker for the ATLAS experiment at the LHC have been built and tested at the CERN SPS accelerator. Results from detailed studies of the straw-tube hit registration efficiency and drift-time measurements and of the pion and electron spectra without and with radiators are presented.
|
|
| 2. |
- Åkesson, Torsten, et al.
(författare)
-
Status of design and construction of the Transition Radiation Tracker (TRT) for the ATLAS experiment at the LHC
- 2004
-
Ingår i: Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment. - : Elsevier BV. - 0167-5087 .- 0168-9002. ; 522:1-2, s. 131-145
-
Tidskriftsartikel (refereegranskat)abstract
- The ATLAS Inner Detector consists of three sub-systems, the Pixel Detector at the innermost radius, the Semi-Conductor Tracker at intermediate radii, and the Transition Radiation Tracker (TRT) at the outermost radius in front of the electromagnetic calorimeter. The TRT provides a combination of continuous tracking with many projective measurements based on individual drift-tubes (or straws) and of electron identification based on radiator fibres or foils interleaved between the straws themselves. This paper describes the current status of design and construction of the various components of the TRT: the assembly of the barrel modules has recently been completed, that of the end-cap wheels is well underway, and the on-detector front-end electronics is in production. The detector modules and front-end electronics boards will be integrated together over the next year, the barrel and end-cap TRT parts will be assembled and tested with their SCT counterparts during 2005 and installation and commissioning in the ATLAS pit will take place at the end of 2005 and the beginning of 2006. (C) 2004 Elsevier B.V. All rights reserved.
|
|
| 3. |
- Åkesson, Torsten, et al.
(författare)
-
An X-ray scanner for wire chambers
- 2003
-
Ingår i: Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment. - 0167-5087. ; 507:3, s. 622-635
-
Tidskriftsartikel (refereegranskat)abstract
- The techniques to measure the position of sense wires and field wires, the gas gain and the gas flow rate inside wire chambers using a collimated and filtered X-ray beam are reported. Specific examples are given using barrel modules of the Transition Radiation Tracker of the ATLAS experiment. (C) 2003 Elsevier B.V. All rights reserved.
|
|
| 4. |
- Åkesson, Torsten, et al.
(författare)
-
Operation of the ATLAS Transition Radiation Tracker under very high irradiation at the CERN LHC
- 2004
-
Ingår i: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. - : Elsevier BV. - 0168-9002. ; 522:1-2, s. 25-32
-
Konferensbidrag (refereegranskat)abstract
- The ATLAS Transition Radiation Tracker (TRT) performance depends critically on the choice of the active gas and on its properties. The most important operational aspects, which have led to the final choice of the active gas for the operation of the TRT at the LHC design luminosity, are presented. The TRT performance expected at these conditions is reviewed, including pile-up effects at high luminosity. (C) 2004 Elsevier B.V. All rights reserved.
|
|
| 5. |
- Björck-Åkesson, Eva, et al.
(författare)
-
Goal setting and problem solving with AAC users and families
- 2000
-
Ingår i: Proceedings from the Ninth Biennial Conference of the International Society for Augmentative and Alternative Communication, August 2nd-6th, 2000, Washington DC, USA..
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)
|
|
| 6. |
- Hays, G. C., et al.
(författare)
-
The diving behaviour of green turtles undertaking oceanic migration to and from Ascension Island: dive durations, dive profiles and depth distribution
- 2001
-
Ingår i: Journal of Experimental Biology. - 1477-9145. ; 204:23, s. 4093-4098
-
Tidskriftsartikel (refereegranskat)abstract
- Satellite telemetry was used to record the submergence duration of green turtles (Chelonia mydas) as they migrated from Ascension Island to Brazil (N=12 individuals) while time/depth recorders (TDRs) were used to examine the depth distribution and dive profiles of individuals returning to Ascension Island to nest after experimental displacement (N=5 individuals). Satellite telemetry revealed that most submergences were short (<5 min) but that some submergences were longer (>20 min), particularly at night. TDRs revealed that much of the time was spent conducting short (24 min), shallow (approximately 0.91.5 m) dives, consistent with predictions for optimisation of near-surface travelling, while long (typically 2030 min), deep (typically 1020 m) dives had a distinctive profile found in other marine reptiles. These results suggest that green turtles crossing the Atlantic do not behave invariantly, but instead alternate between periods of travelling just beneath the surface and diving deeper. These deep dives may have evolved to reduce silhouetting against the surface, which would make turtles more susceptible to visual predators such as large sharks.
|
|
| 7. |
|
|
| 8. |
-
The year in osteoporosis Volume I
- 2004
-
Samlingsverk (redaktörskap) (övrigt vetenskapligt/konstnärligt)abstract
- Drawing on the expertise of a distinguished international team, this book contains 200 recent papers in the peer-reviewed literature that will affect the practice of physicians managing osteoporotic patients. Each paper is summarized, reviewed, and placed in clinical context. Coverage includes the underlying causes of osteoporosis and the latest differing views on prevention and non-pharmacological strategies. The book also reviews new drugs and the possibilities of further pharmaceutical advances. It provides a comprehensive overview of the latest clinical research, carefully assessed and put into clinical context.
|
|
| 9. |
- Woolf, Anthony D, et al.
(författare)
-
Preventing fractures in elderly people
- 2003
-
Ingår i: BMJ: British Medical Journal. - : BMJ. - 1756-1833. ; 327:7406, s. 89-95
-
Forskningsöversikt (refereegranskat)abstract
- Preventing fractures in elderly people is a priority, especially as it has been predicted that in 20 years almost a quarter of people in Europe will be aged over 65. This article describes the factors contributing to fracture, interventions to prevent fracture, and the various treatments
|
|
| 10. |
- Åkesson, Kristina, et al.
(författare)
-
Improved education in musculoskeletal conditions is necessary for all doctors.
- 2003
-
Ingår i: Bulletin of the World Health Organization. - 0042-9686. ; 81:9, s. 677-683
-
Tidskriftsartikel (refereegranskat)abstract
- It is likely that everyone will, at some time, suffer from a problem related to the musculoskeletal system, ranging from a very common problem such as osteoarthritis or back pain to severely disabling limb trauma or rheumatoid arthritis. Many musculoskeletal problems are chronic conditions. The most common symptoms are pain and disability, with an impact not only on individuals’ quality of life but also, importantly, on people’s ability to earn a living and be independent. It has been estimated that one in four consultations in primary care is caused by problems of the musculoskeletal system and that these conditions may account for up to 60% of all disability pensions. In contrast, teaching at undergraduate and graduate levels — and the resulting competence and confidence of many doctors — do not reflect the impact of these conditions on individuals and society. Many medical students do not have any clinical training in assessing patients with bone and joint problems. Under the umbrella of the Bone and Joint Decade 2000–2010, experts from all parts of the world with an interest in teaching have developed recommendations for an undergraduate curriculum to improve the teaching of musculoskeletal conditions in medical schools. The goal for each medical school should be a course in musculoskeletal medicine concentrating on clinical assessment, common outpatient musculoskeletal problems and recognition of emergencies. Improving competency in the management of musculoskeletal problems within primary care settings through improved education is the next aim, but there are needs for improvement for all professionals and at all levels within the health care system.
|
|
| 11. |
- Åkesson, Kristina, et al.
(författare)
-
Management of osteoporosis
- 2003
-
Ingår i: Rheumatology. - 0323024041 ; , s. 2093-2093, s. 77-77
-
Bokkapitel (övrigt vetenskapligt/konstnärligt)
|
|
| 12. |
- Åkesson, Torsten, et al.
(författare)
-
Aging studies for the ATLAS Transition Radiation Tracker (TRT)
- 2003
-
Ingår i: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. - : Elsevier BV. - 0168-9002. ; 515:1-2, s. 166-179
-
Konferensbidrag (refereegranskat)abstract
- A summary of the aging and material validation studies carried out for the ATLAS Transition Radiation Tracker (TRT) is presented. Particular emphasis is put on the different phenomena observed in straw tubes operating with the chosen Xe/CF4/CO2 mixture. The most serious effects observed are silicon deposition on the anode wire and damage of the anode wire gold plating. Etching phenomena and active radical effects are also discussed. With a careful choice of all materials and components, and with good control of the water contamination in the active gas, the ATLAS TRT will operate reliably for 10 years at the LHC design luminosity. To demonstrate this fully, more work is still needed on the gas system purification elements, in particular to understand their interplay with the active species containing fluorine created in the avalanche process under irradiation.
|
|
| 13. |
- Åkesson, Torsten, et al.
(författare)
-
Tracking performance of the transition radiation tracker prototype for the ATLAS experiment
- 2002
-
Ingår i: Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment. - 0167-5087. ; 485:3, s. 298-310
-
Tidskriftsartikel (refereegranskat)abstract
- A prototype of the Transition Radiation Tracker (TRT) for the ATLAS experiment at the CERN LHC has been built and tested at the CERN SPS. Detailed studies of the drift-time measurements, alignment technique, hit registration efficiency, track and momentum accuracy were performed. A coordinate measurement accuracy of 150 Pin for a single TRT drift tube and momentum resolution of 0.8% for 20 GeV pions in a 1.56 T magnetic field were achieved. The results obtained are in agreement with the expected tracking performance of the ATLAS TRT. (C) 2001 Published by Elsevier Science B.V.
|
|
