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[Influence from the month regarding birth around the need for health care to deal with attention deficit hyperactivity disorder. Link between a retrospective study performed in a neuropaediatric clinic].
© 2020 IOP Publishing Ltd.While the pursuit of better time resolution in Positron Emission Tomography (PET) is rapidly evolving, little work has been performed on Time of Flight (TOF) image quality at high time resolution in the presence of modelling inconsistencies. This works focuses on the effect of using the wrong attenuation map in the system model, causing perturbations in the reconstructed radioactivity image. Previous work has usually considered the effects to be local to the area where there is attenuation mismatch, and has shown that the quantification errors in this area tend to reduce with improved time resolution. CBR-470-1 in vitro This publication shows however that errors in the PET image at a distance from the mismatch increase with time resolution. The errors depend on the reconstruction algorithm used. We quantify the errors in the hypothetical case of perfect time resolution for maximum likelihood reconstructions. In addition, we perform reconstructions on simulated and patient data. In particular, for respiratory-gated reconstructions from a wrong attenuation map, increased errors are observed with improved time resolutions in areas close to the lungs (e.g., from 13.3% in non-TOF to up to 20.9% at 200 ps in the left ventricle). Creative Commons Attribution license.Spin-crossover (SCO) solids have been studied for several years due to their fascinating physical properties and their potential applications as optical switches and reversible high-density memories for information storage. Through this article, we will examine in details the effects of substrate's lattice parameters, R_sub, on a deformable spin crossover membrane, simulated using an electro-elastic model taking into account the volume change at the transition. The molecules of the membrane can be either in the low spin state (LS) or the high spin state (HS), while those of the substrate are electronically neutral. Magnetic properties of the SCO membrane and the pressure distribution as a function of the lattice parameter of the substrate have been investigated. We demonstrated that the thermally induced first-order spin transition is significantly affected by the structural properties of the substrate, where a rise in the lattice parameter of the latter lowers the transition temperature and reduces the width of the thermal hysteresis loop. The investigations on the spatiotemporal aspects of the spin transition in the membrane demonstrates that the nucleation and growth processes are sensitive to the structural properties of the elastic misfit between the substrate and the SCO membrane. © 2020 IOP Publishing Ltd.We study theoretically particle-substrate interactions under laser irradiation. Van der Waals, electrostatic double layer and a laser induced dipole in the nanoparticle and an image dipole in the substrate were considered as the major components of the total interaction potential. It was shown that laser-induced attractive potential energy between the particle and substrate reduces the potential barrier which increases the probability for metal nanoparticles be deposited onto the substrate. © 2020 IOP Publishing Ltd.The increased public concerns on healthcare, environment and sustainable development inspired the development of biodegradable and biocompatible electronics that could be used as the degradable electronics in implants. In this work, a fully biodegradable and flexible resistance random access memory (RRAM) was developed with low-cost biomaterial gelatin as the dielectric layer and biodegradable polymer poly(lactide-coglycolide) acid (PLGA) as the substrate. PLGA can be synthesized by a simple solution process and the PLGA substrate can be peeled off the handling substrate for operation once the devices were fabricated. The fabricated memory device exhibited reliable non-volatile resistive switching characteristics with a long retention time over 104 sec and a near-constant on/off resistance ratio of 102 even after 200 cyclic bending, showing the promising potential for application in flexible electronics. Degradation of the devices in deionized water and in phosphate buffered saline (PBS) solution showed that the whole devices can be degraded in water completely. The dissolution of metals and gelatin layer was in few days, while that for PLGA is about 6 months which can be modified by changing the synthesis conditions of the film, thus allowing the development of biodegradable electronics with designed dissolution time. © 2020 IOP Publishing Ltd.We study orbital Mott transition in two dimensional pyrochlore lattice, using a two orbital Hubbard model with only inter-orbital electronic hopping. We use a real space Monte Carlo based approach to study the model at finite temperature, and establish temperature-interaction phase diagrams that highlight the Mott transition, orbital ordering, and spectral trends, and possible window of pseudogap. Due to only inter-orbital hopping, the Mott insulator `generates` ferro exchange resulting in ferro-orbital ordering, with T$_corr/t$ peaked at $approx 0.2$ around $U/t approx 6$. The optical conductivity shows unusual two peak feature due to two dimensional pyrochlore lattice. © 2020 IOP Publishing Ltd.High-Z nanoparticles (NP) as radiosensitization agents provide the feasibility of dose localization within the tumor in radiotherapy. Dose enhancement of NPs in the presence of a magnetic field (MF) could be challenged when magnetic resonance imaging (MRI) systems are used as an image-guided system. The MF can influence dose enhancement of NPs at their interfaces and surrounding medium and affect their dose deposition behavior. In the TOPAS Monte Carlo code, gold nanoparticle (GNP) and superparamagnetic iron oxide nanoparticle (SPION) were irradiated using 70 and 150 MeV proton beams, in presence of transverse MF strengths with 0, 1, 3, and 7 T. The changes in the liberated secondary electrons from NPs and their dose enhancement ratio (DER), magnetic dose enhancement ratio (MDER), and angular dose distribution in 10 nm shell thicknesses up to 500 nanometers from their centers were measured. The central plane of NPs was considered as a scorer that its thickness was 2 nm and divided to 6-degree sectors with 10 nm radial length.
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