ABSTRACT
Ultrahigh-frequency acoustic-phonon resonators usually require atomically flat interfaces to avoid phonon scattering and dephasing, leading to expensive fabrication processes, such as molecular beam epitaxy. Mesoporous thin films are based on inexpensive wet chemical fabrication techniques that lead to relatively flat interfaces regardless the presence of nanopores. Here, we report mesoporous titanium dioxide-based acoustic resonators with resonances up to 90 GHz, and quality factors from 3 to 7. Numerical simulations show a good agreement with the picosecond ultrasonics experiments. We also numerically study the effect of changes in the speed of sound on the performance of the resonator. This change could be induced by liquid infiltration into the mesopores. Our findings constitute the first step towards the engineering of building blocks based on mesoporous thin films for reconfigurable optoacoustic sensors.
ABSTRACT
BACKGROUND: The effectiveness of mindfulness and self-compassion-based interventions (MSCI) on emotional fatigue and stress in Primary Healthcare (PHC) professionals has been demonstrated in the short term. The aims of this work were to assess whether these effects persist after two years, and if the observed results differ between those who practiced mindfulness regularly during the follow-up (meditators) and those who did not. METHODS: Prospective study - pre-post and two years after performing an MSCI that was offered to all PHC professionals in Navarra, with group sessions of 2.5 hours / week for 8 weeks. Attending at least 75% of the sessions and practicing at home for 45 minutes a day were mandatory. At the three moments of the study, questionnaires were distributed to measure levels of mindfulness (FFMQ), self-compassion (SCS), perceived stress (PSQ) and burnout (MBI). At the end of the follow-up period, participants were asked if they were meditators and the time they dedicated to this weekly. RESULTS: Forty-eight professionals were enrolled and 41 (83% women) met the inclusion criteria, without loss to follow-up. Mean scores in mindfulness, self-compassion and perceived stress significantly improved after the intervention and in the long term (p <0.001), without observing differences in the level of burnout. The group of meditators achieved a greater long-term improvement in self-compassion (3.6 points vs. 1.6). CONCLUSIONS: The effectiveness of an MSCI persists two years later regardless of meditator status, although there is a significant improvement in self-compassion in the meditators.
Subject(s)
Burnout, Professional/therapy , Health Personnel/psychology , Mindfulness/methods , Stress, Psychological/therapy , Adult , Compassion Fatigue/therapy , Controlled Before-After Studies , Female , Follow-Up Studies , Humans , Male , Meditation/methods , Middle Aged , Primary Health Care , Prospective Studies , Self Concept , Surveys and Questionnaires , Time FactorsABSTRACT
Main group element coordination polymers (MGE-CPs) are important compounds for the development of multifunctional materials. However, there has been a shortage of studies regarding their structural, optical, catalytic, mechanical, and antibacterial properties. This work presents an exhaustive study of a set of crystalline MGE-CPs obtained from bismuth and indium metals and iminodiacetate, 1,2,4,5-benzenetetracarboxylate, and 2,2'-bipyridine as building blocks. An in-depth topological analysis of the networks was carried out. Additionally, nanoindentation studies were performed on two representative low-dimensional compounds in order to find the relationships between their structural features and their intrinsic mechanical properties (hardness and elasticity). The solid-state photoluminescence (SSPL) properties were also studied in terms of excitation, emission, lifetimes values, and CIE chromaticites. Moreover, the heterogeneous catalytic activities of the compounds were evaluated with the cyanosilylation reaction using a set of carbonylic substrates under solvent-free conditions. Finally, the inhibitory effect of the Bi-CPs on the growth of microorganisms such as Escherichia coli, Salmonella enterica serovar Typhimurium, and Pseudomonas aeruginosa, which are associated with relevant infectious diseases, is reported.
ABSTRACT
Silver nanoparticle assemblies are embedded within mesoporous oxide thin films by an in situ mild reduction leading to nanoparticle-mesoporous oxide thin-film composites (NP@MOTF). A quantitative method based on X-ray reflectivity is developed and validated with energy dispersive spectroscopy in order to assess pore filling. The use of dilute formaldehyde solutions leads to control over the formation of silver nanoparticles within mesoporous titania films. Inclusion of silver nanoparticles in mesoporous silica requires more drastic conditions. This difference in reactivity can be exploited to selectively synthesize nanoparticles in a predetermined layer of a multilayered mesoporous stack leading to complex 1D-ordered multilayers with precise spatial location of nanometric objects. The metal oxide nanocomposites synthesized have potential applications in catalysis, optical devices, surface-enhanced Raman scattering, and metal enhancement fluorescence.
Subject(s)
Metal Nanoparticles/chemistry , Nanotechnology/methods , Silver/chemistry , Metals/chemistry , Microscopy, Electron, Transmission , Nanoparticles/chemistry , Optics and Photonics , Oxides/chemistry , Silicon Dioxide/chemistry , Spectrometry, Fluorescence/methods , Spectrum Analysis, Raman/methods , Surface Properties , Titanium/chemistry , X-RaysABSTRACT
El enfoque familiar le ayudará al profesional sanitario a dar respuestas tanto a las necesidades del paciente como de su familia. En este trabajo se comentan algunas de las situaciones frecuentes en la práctica de la Atención Primaria en las que se puede realizar un abordaje familiar del caso: la atención a pacientes crónicos, el abordaje familiar en pacientes terminales, familias con enfermos mentales, abordaje familiar en consumidores abusivos de alcohol. En el caso de los pacientes crónicos, su enfermedad requiere una adaptación de toda la familia a la nueva situación. Ello conlleva en ocasiones situaciones de conflicto y a veces de enfermedad de otros miembros si el personal sanitario no está atento a ello. Se describen 6 sencillos consejos que pueden ayudar a la implementación del enfoque familiar psicoeducativo en el tratamiento de las enfermedades crónicas. El objetivo de la Atención Primaria en los casos de enfermedades terminales, muerte y duelo, es canalizar este impacto sobre todo en la familia del fallecido para que pueda tener un efecto reparador, y controlar su repercusión para prevenir la aparición de sintomatología en un futuro. En el abordaje de familias de enfermos mentales, se pueden plantear estrategias familiares que contribuyan al cambio del comportamiento del paciente y a la vez realizar un apoyo a la familia para que se enfrente a estas situaciones. Esto cobra especial importancia en el abordaje familiar en consumidores abusivos de alcohol (AU)
