819 research outputs found
Writing Physics at University
User guide to written communication in academic disciplines (in this case physics) for teachers and students
Patient safety culture in orthopaedics surgery. Influence of a training activities plan
Objetivo: Conocer las características de la cultura de seguridad clínica en cirugía ortopédica y traumatología, valorando la influencia de una intervención formativa en su tendencia evolutiva. Población y metodología: Estudio observacional ecológico con intervención formativa. La población objeto de estudio fueron los profesionales del Servicio de Cirugía Ortopédica y Traumatología del Hospital Clínic Universitario de Barcelona. Se utilizó la versión española del cuestionario HSOPS para valorar la cultura de seguridad clínica. Resultados: El porcentaje de respuestas válidas obtenidas fue superior al 60% en las dos mediciones de la cultura realizadas. Las 12 dimensiones consideradas mejoraron su tendencia. El trabajo en equipo dentro del servicio se identificó como una dimensión de fortaleza del modelo. Conclusiones: La intervención formativa ha consolidado una tendencia favorable. La mejora de la cultura de seguridad clínica requiere tiempo y actuaciones periódicas
The role of temperature in the magnetic irreversibility of type-I Pb superconductors
Evidence of how temperature takes part in the magnetic irreversibility in the
intermediate state of a cylinder and various disks of pure type-I
superconducting lead is presented. Isothermal measurements of first
magnetization curves and magnetic hysteresis cycles are analyzed in a reduced
representation that defines an equilibrium state for flux penetration in all
the samples and reveals that flux expulsion depends on temperature in the disks
but not in the cylinder. The magnetic field at which irreversibility sets in
along the descending branch of the hysteresis cycle and the remnant
magnetization at zero field are found to decrease with temperature in the
disks. The contributions to irreversibility of the geometrical barrier and the
energy minima associated to stress defects that act as pinning centers on
normal-superconductor interfaces are discussed. The differences observed among
the disks are ascribed to the diverse nature of the stress defects in each
sample. The pinning barriers are suggested to decrease with the magnetic field
to account for these results
Destination Therapy with Left Ventricular Assist Devices in Non-transplant Centres: The Time is Right
For almost half a century, cardiac transplant has been the only long-term treatment for patients with end-stage heart failure. Implantable left ventricular assist devices (LVADs) have emerged as a new treatment option for advanced heart failure as destination therapy for patients either too old or not suitable for transplant. A meta-analysis presenting head-to-head comparisons of cardiac transplant versus LVAD as destination therapy (LVAD-DT) found no difference in 1-year mortality rates between LVAD-DT and cardiac transplant (OR 1.49; 95% CI [0.48–4.66]; I2=82.8%). Moreover, a recent subanalysis from the Interagency Registry for Mechanically Assisted Circulatory Support found similar outcomes after LVAD-DT implantation in both transplant and non-transplant centres. The time is right for LVAD-DT in non-transplant centres, provided multidisciplinary heart failure teams and expertise are in place
Emergence of the stripe-domain phase in patterned permalloy films
The occurrence of stripe domains in ferromagnetic permalloy (Py = Fe20Ni80) is a well-known phenomenon which has been extensively observed and characterized. This peculiar magnetic configuration appears only in films with a thickness above a critical value (dcr), which is strongly determined by the sputtering conditions (i.e., deposition rate, temperature, magnetic field). So far, dcr has usually been presented as the boundary between the homogeneous (H) and stripe-domain (SD) regime, respectively, below and above dcr. In this work we study the transition from the H to the SD regime in thin films and microstructured bridges of Py with different thicknesses. We find there is an intermediate regime, over a quite significant thickness range below dcr, which is signaled in confined structures by a quickly changing domain-wall configuration and by a broadening of the magnetoresistance dip at the coercive field. We call this the emerging stripe-domain (ESD) regime. The transition from the ESD to the SD regime is accompanied by a sharp increase of the magnetoresistance ratio at the thickness where stripes appear in MFM
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