186698 research outputs found
Sort by
Structural and Magnetic Properties of CoFe2O4 Nanoparticles in an α-Fe2O3 Matrix
No full textCoFe2O4 nanoparticles (NPs) of ∼5 nm have been synthesized by the polyol method and subsequently used as seeds in a sol-gel process to prepare a ferrimagnetic/antiferromagnetic CoFe2O4@α-Fe2O3 nanocomposite. During the formation of α-Fe2O3, the CoFe2O4 NPs form clusters embedded within the antiferromagnetic matrix. The combination of data collected by SQUID magnetometry and Mössbauer spectrometry, together with the structural data obtained from X-ray powder diffraction and transmission electron microscopy, allows us to get a complete picture of the complex nanocomposite system. We address the difficulties in synthesizing phase-pure α-Fe2O3 through sol-gel methods, emphasizing that obtaining a pure hematite phase free from contamination requires precise optimization of sintering conditions, which are not yet clearly defined in the current literature. The relationship between the growth of nanoparticles and the increase in coercivity is discussed as a result of the controlled chemical synthesis of the composite. Furthermore, a new feature emerges in the form of a magnetic bias, hinting at the superexchange coupling between the ferrimagnetic CoFe2O4 and antiferromagnetic α-Fe2O3 phases at their interface
A viewpoint about Lenadogene nolparvovec failing to meet its primary endpoint even though it permanently corrects the m.11778G>A mutation causative of LHON
No full textHow does dishonesty diffuse? An experiment comparing spread and concentrated incentives
No full textWe experimentally test if the propensity to cheat changes when subjects face different distributions of the same monetary incentive. Such a manipulation represents a costless intervention in the many situations where multiple reports are required simultaneously, like timesheets or expense reimbursements. In our experiment, subjects have to roll a die in private five times and report the outcomes. In the LAST treatment, only the fifth reported roll determines the payoff, whereas in the SUM treatment, all five reports contribute proportionally to the payoff. The possible reward from reporting remains the same, but the two treatments differ in the effort required to obtain it: inflating one report or many. We find that subjects report significantly higher numbers in LAST compared to the average report in SUM. Looking at the total of reports, it does not differ by treatment since subjects do not inflate the reported rolls when there is no incentive. Dishonesty differs as there are more opportunities, having the positive effect of reducing the total profit obtained from cheating, but the negative effect of spreading the lies across all the opportunities. The total amount of cheating made remains stable across conditions, but it costs less when the incentive is spread on multiple reports
Laboratory testing and modelling of the hydrological performance of a resin gravel permeable pavement
No full textPermeable pavements (PPs) allow increasing the resilience of the built environment to water-related risks, although their hydrological contribution is often assumed rather than demonstrated. A PP was tested in the laboratory by monitoring the outflow from a standardized test bed under various rainfall inputs. The results are fitted with the mathematical formulation of the step response of the first- and second-order dynamic systems, and the proposed formulation is validated in different test conditions showing a Pearson coefficient larger than 0.990. Performance indices were calculated, showing significant peak reduction (detention) between 8% and 30%, and retention between 9% and 22%. Quantitative trends were derived to extrapolate the behaviour of the PP to morphological/climatological conditions that were not tested and to support more informed design/installation of this PP. The role of this solution at the catchment scale can be assessed by integrating specific simulation modules based on the proposed formulation into hydrological models
Modeling and Design of Compliant Bistable Mechanisms: A Brief Review with A Case Study on Variable Constant Force Mechanism
No full textI borghi del Ponente Ligure negli acquerelli della famiglia Épinois tra permanenze e mutamenti territoriali
No full textLa Corte EDU e il diritto “canzonatorio” dei diritti fondamentali: le garanzie durante gli accessi il diritto al silenzio
No full text
The Many Faces of REM Sleep Behavior Disorder. Providing Evidence for a New Lexicon
No full textBackground: People with idiopathic/isolated REM sleep behavior disorder (iRBD) are highly heterogeneous, showing mild motor, cognitive, and dysautonomia symptoms. The aim of this study is to unveil the clinical heterogeneity of iRBD with a specific reference to overlapping features with prodromal Parkinson's disease (pPD) and prodromal dementia with Lewy bodies (pDLB) labels. Methods: People with a polysomnography-confirmed diagnosis of iRBD were enrolled and followed over time. At baseline, pPD and pDLB criteria were assessed. Results: Among the 285 iRBD people (68.2 ± 7.6 years, 81% males), due to additional signs or symptoms, 49.8% fulfilled pPD criteria only, 5.6% pDLB criteria only, and 14.4% subjects fulfilled both pPD and pDLB criteria. Conversely, about one third of iRBD people (30.2%) did not meet either pPD or pDLB criteria. At follow-up (40.6 ± 43.6 months), 28.8% subjects phenoconverted, developing PD (56.1%), DLB (39%), or multiple system atrophy (4.9%). Subjects with iRBD fulfilling either pPD or pDLB criteria, or both, have an increased risk of phenoconversion (adjusted hazard ratio, aHR 2.34, 95% confidence interval, CI 1.24–4.41). On the opposite, subjects not fulfilling prodromal criteria have a significantly reduced short-term phenoconversion likelihood (aHR 0.43, 95% CI 0.23–0.81). Notably, pPD and pDLB criteria did not predict PD and DLB diagnoses, respectively. Conclusions: People with iRBD are highly heterogeneous, and the presence of other concomitant signs and symptoms is frequent, leading to faster phenoconversion. Thus, the terms idiopathic and isolated may be poorly appropriate and possibly even confounding. These results pave the way to a more appropriate new lexicon for people with RBD
