995 research outputs found

    A numerical study of the spectrum and eigenfunctions on a tubular arc

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    The Hamiltonian for a particle constrained to move on the surface of a curved nanotube is derived using the methods of differential forms. A two-dimensional Gram-Schmidt orthonormalization procedure is employed to calculate basis functions for determining the eigenvalues and eigenstates of a tubular arc (a nanotube in the shape of a hyperbolic cosine) with several hundred scattering centers. The curvature of the tube is shown to induce bound states that are dependent on the curvature parameters and bend location of the tube.Comment: 14 pages, 5 tables, 6 figure

    Electron wave functions on T2T^2 in a static magnetic field of arbitrary direction

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    A basis set expansion is performed to find the eigenvalues and wave functions for an electron on a toroidal surface T2T^2 subject to a constant magnetic field in an arbitrary direction. The evolution of several low-lying states as a function of field strength and field orientation is reported, and a procedure to extend the results to include two-body Coulomb matrix elements on T2T^2 is presented.Comment: 18 pages, 6 figure

    Could extended reality haptics be used in health-care education? A survey of health-care students, educators and clinicians

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    Purpose: This study, which is a cross-sectional survey, aims to investigate health-care academics, clinicians and students’ perspectives of health-care simulation-based learning (SBL) and extended reality (XR) haptics use within health-care education. Participants’ views regarding the application, barriers and facilitators of SBL and XR haptics were explored.Design/methodology/approach: The authors conducted an online international cross-sectional survey of 178 participants.Findings: The survey found high health-care SBL use (n = 97, 55.1%) but low awareness (n = 48, 27.3%) or prior use of XR haptics (n = 14, 7.9%). Participants expressed interest in XR haptic technology emphasising its potential in SBL, particularly for understanding anatomy and physiology, enhancing clinical reasoning and consultation and practical skills.Research limitations/implications: Whilst there was interest in XR haptics, few participants described previous experience of using this technology in SBL. A large percentage of the participants were UK-based. Most participants were from a nurse or physiotherapy professional background.Practical implications: XR haptics is a developing technology for SBL in health-care education. Whilst there was clear interest from survey participants, further research is now required to develop and evaluate the feasibility of using this technology in health-care education.Originality/value: Health-care students, educators and clinicians views on XR haptics have not previously been explored in the development and application of this technology. The findings of this survey will inform the development of XR learning scenarios that will be evaluated for feasibility in health-care SBL

    Folding of small proteins: A matter of geometry?

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    We review some of our recent results obtained within the scope of simple lattice models and Monte Carlo simulations that illustrate the role of native geometry in the folding kinetics of two state folders.Comment: To appear in Molecular Physic

    Patients' experience of shoulder disorders: a systematic review of qualitative studies for the OMERACT Shoulder Core Domain Set.

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    OBJECTIVES:To describe the experiences (including symptoms and perceived impacts on daily living) of people with a shoulder disorder. METHODS:Systematic review of qualitative studies. We searched for eligible qualitative studies indexed in Ovid MEDLINE, Ovid Embase, CINAHL (EBSCO), SportDiscus (EBSCO) and Ovid PsycINFO up until November 2017. Two authors independently screened studies for inclusion, appraised their methodological quality using the Critical Appraisal Skills Programme checklist, used thematic synthesis methods to generate themes describing the experiences reported by participants and assessed the confidence in the findings using the Grading of Recommendations Assessment, Development and Evaluation Confidence in Evidence from Reviews of Qualitative research (GRADE-CERQual) approach. RESULTS:The inclusion criteria were met by eight studies, which included 133 participants (49 females and 84 males) with either rotator cuff disease, adhesive capsulitis, proximal humeral fracture, shoulder instability or unspecified shoulder pain. We generated seven themes to describe what people in the included studies reported experiencing: pain; physical function/activity limitations; participation restriction; sleep disruption; cognitive dysfunction; emotional distress; and other pathophysiological manifestations (other than pain). There were interactions between the themes, with particular experiences impacting on others (e.g. pain leading to reduced activities and sleep disruption). Following grading of the evidence, we considered it likely that most of the review findings were a reasonable representation of the experiences of people with shoulder disorders. CONCLUSION:Patients with shoulder disorders contend with considerable disruption to their life. The experiences described should be considered by researchers seeking to select the most appropriate outcomes to measure in clinical trials and other research studies in people with shoulder disorders

    Could extended reality haptics be used in healthcare education? A survey of healthcare students, educators, and clinicians

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    Purpose: This study, which is a cross-sectional survey, aims to investigate health-care academics, clinicians and students’ perspectives of health-care simulation-based learning (SBL) and extended reality (XR) haptics use within health-care education. Participants’ views regarding the application, barriers and facilitators of SBL and XR haptics were explored.Design/methodology/approach: The authors conducted an online international cross-sectional survey of 178 participants.Findings: The survey found high health-care SBL use (n = 97, 55.1%) but low awareness (n = 48, 27.3%) or prior use of XR haptics (n = 14, 7.9%). Participants expressed interest in XR haptic technology emphasising its potential in SBL, particularly for understanding anatomy and physiology, enhancing clinical reasoning and consultation and practical skills.Research limitations/implications: Whilst there was interest in XR haptics, few participants described previous experience of using this technology in SBL. A large percentage of the participants were UK-based. Most participants were from a nurse or physiotherapy professional background.Practical implications: XR haptics is a developing technology for SBL in health-care education. Whilst there was clear interest from survey participants, further research is now required to develop and evaluate the feasibility of using this technology in health-care education.Originality/value: Health-care students, educators and clinicians views on XR haptics have not previously been explored in the development and application of this technology. The findings of this survey will inform the development of XR learning scenarios that will be evaluated for feasibility in health-care SBL

    Hydroxamate Titanium−Organic Frameworks and the Effect of Siderophore-Type Linkers over Their Photocatalytic Activity

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    The chemistry of Metal-Organic Frameworks (MOFs) relies on the controlled linking of organic molecules and inorganic secondary building units to assemble an unlimited number of reticular frameworks. However, the design of porous solids with chemical stability remains still limited to carboxylate or azolate groups. There is a timely opportunity to develop new synthetic platforms that make use of unexplored metal binding groups to produce metal-linker joints with hydrolytical stability. Living organisms use siderophores (iron carriers in greek) to effectively assimilate iron in soluble form. These compounds make use of hard oxodonors as hydroxamate or catecholate groups to coordinate metal Lewis acids like iron, aluminium or titanium to form metal complexes very stable in water. Inspired by the chemistry of these microorganisms, we report the first hydroxamate MOF prepared by direct synthesis. MUV-11 (MUV = Materials of Universidad de Valencia) is a crystalline, porous material (close to 800 m2·g-1) that combines photoactivity with good chemical stability in acid conditions. By using a high-throughput approach, we also demonstrate that this new chemistry is compatible with the formation of single crystalline phases for multiple titanium salts, thus expanding the scope of precursors accessible. Titanium frameworks are regarded as promising materials for photocatalytic applications. Our photoelectrochemical and catalytic tests suggests important differences for MUV-11. Compared to other Ti-MOFs, changes in the photoelectrochemical and photocatalytic activity have been rationalized with computational modelling revealing how the chemistry of siderophores can introduce changes to the electronic structure of the frontier orbitals, relevant to the photocatalytic activity of these solids

    Proposed Standards for Medical Education Submissions to the Journal of General Internal Medicine

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    To help authors design rigorous studies and prepare clear and informative manuscripts, improve the transparency of editorial decisions, and raise the bar on educational scholarship, the Deputy Editors of the Journal of General Internal Medicine articulate standards for medical education submissions to the Journal. General standards include: (1) quality questions, (2) quality methods to match the questions, (3) insightful interpretation of findings, (4) transparent, unbiased reporting, and (5) attention to human subjects’ protection and ethical research conduct. Additional standards for specific study types are described. We hope these proposed standards will generate discussion that will foster their continued evolution
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