Albrechtsennymand2250

The structures and electronic properties of InTe/graphene van der Waals heterostructures are systematically investigated using the first-principles calculations. The electronic properties of InTe monolayer and graphene are well preserved respectively and the bandgap energy of graphene is opened to 36.5 meV in the InTe/graphene heterostructure. An n-type Schottky contact is formed in InTe/graphene heterostructure at the equilibrium state. There is a transformation between n-type and p-type Schottky contact when the interlayer distance is smaller than 3.56 Å or the applied electric field is larger than -0.06 V/Å. In addition, the Schottky contact converts to Ohmic contact when the applied vertical electric field is larger than 0.11 V/Å or smaller than -0.13 V/Å. © 2020 IOP Publishing Ltd.A tissue engineered vessel has the potential to provide an alternative small diameter vascular graft for patients with cardiovascular disease in need of surgical revascularization. In this study, a polyglycolic acid (PGA) electrospun scaffold seeded with human dermal fibroblasts was stimulated with circumferential mechanical stretch by a pulsatile perfusion system. The PGA scaffold was fabricated using a custom electrospinning set-up to co-electrospray a sacrificial polyethylene oxide microparticle to increase pore size and bulk porosity. The tissue engineered vessel exposed to circumferential mechanical stretch was compared to an engineered vessel cultured under static conditions without any mechanical stimulation. The histology cross-sections demonstrated a similar thickness of engineered vessels with mechanical stretch and static, but on Masson's Trichrome stain there was nearly twice the amount of staining for collagen. Temsirolimus The collagen content was quantified, and the collagen content was 60% greater in the hIn this work, we propose a novel approach to design robust microfluidic devices with integrated plasmonic transducers allowing portability, reduced analysis time through dynamic measurements and high sensitivity. Specifically, the strategy we apply involves two steps i) the controlled deposition of gold bipyramidal nanoparticles (AuBPs) onto a functionalized solid glass substrate and ii) the integration of the as-fabricated plasmonic substrate into a polydimethylsiloxane (PDMS) microfluidic circuit. The localized Surface Plasmon Resonance (LSPR) sensitivity of the plasmonic-microfluidic device was evaluated by monitoring the optical responses at refractive index changes proving a bulk sensitivity of 243 RIU/nm for the longitudinal LSPR band of isolated AuBPs and 150 RIU/nm for the band assigned to end-to-end linked nanoparticles. A strong electric field generated in the gaps between AuBPs - due to the generation of the so-called 'hot-spots' - was subsequently proved by the SERS detection of molecules in continuous flow conditions by loading the analyte into the microfluidic channel via a syringe pump. In conclusion, our miniaturized portable microfluidic system aims to detect and identify in real-time with high specificity and accuracy analyte molecules in laminal flow, providing thus a groundwork for further complex biosensing applications. © 2020 IOP Publishing Ltd.The quest for new light-weight materials with superior mechanical properties is a goal of materials scientists and engineers worldwide. A promising route in this pursuit is drawing inspiration from Nature to design and develop materials with enhanced properties. By emulating the graded mineral content and hierarchical structure of fish scales of the Arapaima Gigas from the nano to macro scales, we were able to develop bioinspired laminated composites with improved impact resistance. Activated by the addition of nano-particles of Al2O3 and nano-layers of TiN to a thermoplastic fiber substrate, new energy dissipation mechanisms operating at the nanoscale enhanced the energy absorption and stiffness of the bioinspired material. Remarkably, the newly developed materials are easily transferred to the industry with minimum associated manufacturing costs. © 2020 IOP Publishing Ltd.We theoretically demonstrate a switchable multichannel near-infrared absorber in a composite structure based on vanadium dioxide nanoparticles embedded between two one-dimensional photonic crystal mirrors. A switching of absorption behavior is induced through the reversible semiconductor-to-metal phase transition of vanadium dioxide nanoparticles via its temperature-dependent permittivity-thermo-optical effect. This behavior leads to a multi-wavelength reconfigurable optical response of the proposed structure from poorly absorbing to highly absorbing. For example, there is the possibility of enhancement of absorption from ~0.14 to ~0.75 at normal incidence of light by increasing the temperature beyond the critical value of ~341 K when the vanadium dioxide nanoparticles transform from a semiconducting state into a metallic one. These properties make the considered structure applicable for use in multiband absorbers, light detectors, and optical switching devices. © 2020 IOP Publishing Ltd.BACKGROUND All definitions for diagnosing sarcopenia, include the estimation of muscle mass. This can be made using bioelectrical impedance analysis (BIA) or dual X-ray absorptiometry (DXA). BIA is a portable and inexpensive method suitable for clinical settings, while DXA is cumbersome, more expensive and less available. OBJECTIVES to evaluate the interchangeability of both techniques for skeletal muscle mass index (SMI) estimation, and assess whether the two methods are comparable for the diagnosis of sarcopenia. DESIGN Prospective, cross-sectional study. SETTING Faculty for Health Sciences, Universidad de Caldas, Colombia. PARTICIPANTS Seventy-two subjects aged 65-80 years were recruited. MEASUREMENTS BIA and DXA for SMI estimation and sarcopenia diagnoses using the definition of the European Working Group on Sarcopenia in Older People (EWGSOP). Of the 72 patients, 28 were diagnosed with sarcopenia by BIA and corroborated by DXA were included in the study. To establish the agreement between techniques, theed. © 2020 Institute of Physics and Engineering in Medicine.