5,419 research outputs found

    Tsunamis generated by fast granular landslides: 3D experiments and empirical predictors

    Get PDF
    Landslides falling into water bodies can generate impulsive waves, which are a type of tsunamis. The propagating wave may be highly destructive for hydraulic structures, civil infrastructure and people living along the shorelines. A facility to study this phenomenon was set up in the laboratory of the Technical University of Catalonia. The set-up consists of a new device releasing granular material at high velocity into a wave basin. A system employing laser sheets, high-speed and high-definition cameras was designed to accurately measure the high velocity and geometry of the sliding mass as well as the produced water displacement in time and space. The analysis of experimental data helped to develop empirical relationships linking the landslide parameters with the produced wave amplitude, propagation features and energy, which are useful tools for the hazard assessment. The empirical relationships were successfully tested in the case of the 2007 event that occurred in Chehalis Lake (Canada).Peer ReviewedPostprint (author's final draft

    Utilizing the NANT Core Competencies to Guide the Occupational Therapy Doctoral Capstone Experience and Project in the NICU

    Get PDF
    The occupational therapy doctorate degree requires a capstone experience and project to be completed within a specific occupational therapy (OT)-related setting. The doctoral capstone experience and project can be difficult to complete in the highly specialized Neonatal Intensive Care Unit (NICU). This paper provides a sample outline of the doctoral capstone experience and project in the NICU. The NANT Core Competencies, written by the National Association of Neonatal Therapists Professional Collaborative, were utilized as a guideline to track student progress and ensure understanding of neonatal therapy topics. This paper follows one student’s doctoral capstone experience and project in the NICU while mentored by an occupational therapist. Learning objectives related to utilizing the NANT Core Competencies, gaining clinical skills, and participating in program development were created. The site mentor trained, supported, and educated the student in the NICU while monitoring her progress during the fourteen weeks. Overall, the student successfully completed all objectives. This paper provides an example of the doctoral capstone experience and project in the NICU utilizing the NANT Core Competencies to support the mentor-student relationship and student learning with educational topics provided in the competencies guiding the capstone experience. With details including student progress, weekly mentor-student meetings, and roles/responsibilities of the student and mentor, this paper serves as a resource and guideline for OT faculty as well as potential mentors of occupational therapy doctorate students in the NICU setting. Additionally, this paper highlights the feasibility of the completion of the OT doctoral capstone in the NICU

    Phase Coherence in Quantum Brownian Motion

    Get PDF
    The quantum theory of Brownian motion is discussed in the Schwinger version wherein the notion of a coordinate moving forward in time x(t)x(t) is replaced by two coordinates, x+(t)x_+(t) moving forward in time and x(t)x_-(t) moving backward in time. The role of the doubling of the degrees of freedom is illustrated for the case of electron beam two slit diffraction experiments. Interference is computed with and without dissipation (described by a thermal bath). The notion of a dissipative interference phase, closely analogous to the Aharonov-Bohm magnetic field induced phase, is explored.Comment: 12 pages, LaTeX, 2 Figure

    Barriers and facilitators to staying in work after stroke: insight from an online forum.

    Get PDF
    OBJECTIVE: To explore barriers and facilitators to staying in work following stroke. DESIGN: Qualitative analysis of posts regarding staying in work following stroke using the archives of an online forum for stroke survivors. PARTICIPANTS: 60 stroke survivors (29 male, 23 female, 8 not stated; mean age at stroke 44 years) who have returned to work, identified using terms 'return to work' and 'back at work'. SETTING: Posts from UK stroke survivors and family members on Talkstroke, the forum of the Stroke Association, between 2004 and 2011. RESULTS: Stroke and transient ischaemic attack (TIA) survivors reported residual impairments that for many had impact on work. Most impairments were 'invisible', including fatigue, problems with concentration, memory and personality changes. Participants described positive (eg, back at work being better than expected) and negative work experiences, including being at risk of losing the job because of stroke-related impairments. Barriers to successfully staying in work included lack of understanding of stroke--in particular invisible impairments--of survivors, employers and general practitioners (GPs), and lack of support in terms of formal adjustments, and 'feeling supported'. Stroke survivors described how they developed their own coping strategies, and how workplace and employer helped them to stay in work. CONCLUSIONS: Despite having been able to return to work after a stroke, people may still experience difficulties in staying in work and risking losing their job. There is a need to improve awareness, in particular of invisible stroke-related impairments, among stroke survivors, work personnel and clinicians. This might be achieved through improved assessments of residual impairments in the workplace and in general practice. Future studies should investigate the effect of unrecognised fatigue and invisible impairments on staying in work following stroke, and explore the potential role for primary care in supporting stroke survivors who have returned to employment.This study was funded by the Evelyn Trust. Anna De Simoni is funded by a NIHR Academic Clinical Lectureship. Andrew Bateman was supported by the National Institute for Health Research (NIHR) Collaboration for Leadership in Applied Health Research and Care East of England at Cambridgeshire and Peterborough NHS Foundation Trust. The views expressed are those of the author(s) and not necessarily those of the NHS, the NIHR or the Department of Health.This is the final published version. It first appeared at http://bmjopen.bmj.com/content/6/4/e009974.abstract

    How primary care can help stroke survivors with returning to work: focus groups with stakeholders from a UK community

    Get PDF
    Background Evidence about how primary care can best enable survivors of transient ischaemic attack (TIA)/stroke return to work is limited. Aim This study explored the role of primary care in supporting survivors of transient ischaemic attack (TIA)/stroke return to work with stakeholders from a local UK community. Design A qualitative study using framework analysis. Method Four focus groups were carried out in Cambridgeshire, UK, between September and November 2015. The 18 participants included survivors of TIA/stroke, carers, an employer representative, GPs, occupational therapists (OTs), and clinical commissioners. Results There was a mismatch between patient and carer needs and what is provided by primary care. This included: lack of GP awareness of invisible impairments; uncertainty how primary care could help in time-limited consultations; and complexity of return-to-work issues. Primary care physicians were not aware of relevant services they could refer patients to, such as OT support. In addition, there was an overall lack of coordination between different stakeholders in the return-to-work process. Linking with other services was considered important but challenging because of ongoing changes in service structure and the commissioning model. Suggestions for improvement include: a central contact in primary care for signposting to available services; a rehabilitation assessment integrated with the electronic record; and a patient-held shared-care plan at discharge from stroke wards. Conclusion Improving the role for primary care in helping survivors of TIA/stroke return to work is challenging. However, primary care could play a central role in initiating/coordinating vocational rehabilitation. Through focus group discussions with stakeholders from a local community, patients, carers, and clinical commissioners were able to put forward concrete proposals to address the barriers identified.This study was funded by the Evelyn Trust (grant reference14/33). Anna De Simoni was funded by a NIHR Academic Clinical Lectureship. Andrew Bateman was supported by the National Institute for Health Research (NIHR) Collaboration for Leadership in Applied Health Research and Care East of England at Cambridgeshire and Peterborough NHS Foundation Trust. Jonathan Mant is an NIHR Senior Investigator. The views expressed are those of the author(s) and not necessarily those of the NHS, the NIHR or the Department of Healt

    Versatile image-based measurements of granular flows and water wave propagation in experiments of tsunamis generated by landslides

    Get PDF
    Landslides falling into water bodies can generate destructive waves, which can be classified as tsunamis. An experimental facility to study this phenomenon has been set up. It consists of a landslidegenerator releasing gravel at high-speed into a wave basin. A non-intrusive system has been designed ad-hocto be able to measure the high velocity and the geometry of the landslide as well as the generated waves characteristics. The measurement system employs the treatment of images captured by a high-speed camera which records the launched granular material illuminated by a laser sheet. A grid of laser sheets marks thebasin water surface. The water has been filled by a small amount of kaolin to properly reflect the laser lightat water surface. Thus, by filming with high definition cameras the perturbed water surface and successively processing the resulting images, it has been possible to measure the generated waves. The measurement framework employs a versatile camera calibration technique which allows accurate measurements in presence of: (1) high lens distortions; (2) pronounced non-parallelism condition between camera sensor and plane of measurement coincident with the laser sheet. The maximum resolution of the measurement tool is0.01 mm, while the maximum uncertainty due to systematic error has been estimated to be 15% for theworst-case scenario. This work improves the suitability of image-based measuring systems in granular flows and free surface hydraulics experimentsThis work was funded by GITS and the 3 years’ national project DEBRIS FLOW (CGL 2009-13039) ofthe Spanish Ministry of Education. Francesco Bregoli has been supported by the 4-years grant FPU2009-3766 of the SpanishMinistry of Education. Authors want to thank Dr. Cecilia Caldini (IDOM Consulting, Barcelona) for the 3D reconstruction ofthe laboratory setup.Peer ReviewedPostprint (published version
    corecore