Vocal fatigue perceived in remote working by teachers of different school grades during COVID-19 pandemic.

Objective: Teachers have an increased prevalence of voice disorders. The present study aimed to investigate the impact of remote teaching on perceived voice fatigue among Italian teachers of all grades during the lockdown due to the COVID-19 pandemic.

Method: s The participants were 195 female teachers (M=48.

[Did child-psychiatry patients really experience the dreaded clinical degradation during the COVID-19 pandemic lockdown?].

Background: The general lockdown period during the COVID-19 pandemic which covered mid-March to mid-May 2020 in France raised important questions about the direct and indirect psychological effects on children and adolescents. Perceived intuitively as harmful and even traumatic in the media's discourse, we tried to better qualify its effects from two complementary approaches. We carried out a review of the literature on the subject to which we associated a regular assessment of the children's global clinical state in the entire active file of the child-psychiatry department of the Centre Hospitalier Universitaire de Brest throughout the lockdown period.

Nanostructure of Porous Si and Anodic SiO Surface Passivation for Improved Efficiency Porous Si Solar Cells.

The photovoltaic effect in the anodic formation of silicon dioxide (SiO) on porous silicon (PS) surfaces was investigated toward developing a potential passivation technique to achieve high efficiency nanostructured Si solar cells. The PS layers were prepared by electrochemical anodization in hydrofluoric acid (HF) containing electrolyte. An anodic SiO layer was formed on the PS surface via a bottom-up anodization mechanism in HCl/HO solution at room temperature.

In vivo comparison of the optiflow and EZ glide aortic dispersion cannulas.

Objectives: Morbidity associated with coronary artery bypass grafts and embolization during aortic cannulation is strongly related to patient characteristics/comorbidities, arterial cannulation site used and the shape of arterial cannulae tips. The desired features of an arterial cannula should be to mitigate the morbid effects of these cannulas and to focus on achieving higher blood flows with lower cannula pressures (CPs).

Materials And Methods: To evaluate the in vivo performance of two aortic dispersion flow cannulas: the Optiflow (Sorin Group, Italy) and EZ Glide (Edwards Lifesciences).

Growth optimization and characterization of regular arrays of GaAs/AlGaAs core/shell nanowires for tandem solar cells on silicon.

With a band gap value of 1.7 eV, AlGaAs is one of the ideal III-V alloys for the development of nanowire-based Tandem Solar Cells on silicon. Nevertheless, growing self-catalysed AlGaAs nanowires on silicon by solid-source molecular beam epitaxy is a very difficult task due to the oxidation of Al adatoms by the SiO layer present on the surface.

Nanoscale investigation of a radial p-n junction in self-catalyzed GaAs nanowires grown on Si (111).

One obstacle for the development of nanowire (NW) solar cells is the challenge to assess and control their nanoscale electrical properties. In this work a top-cell made of p-n GaAs core/shell NWs grown on a Si(111) substrate by Molecular Beam Epitaxy (MBE) is investigated by high resolution charge collection microscopy. Electron Beam Induced Current (EBIC) analyses of single NWs have validated the formation of a homogeneous radial p-n junction over the entire length of the NWs.

Combined front and back diffraction gratings for broad band light trapping in thin film solar cell.

In this paper, we present the integration of combined front and back 1D and 2D diffraction gratings with different periods, within thin film photovoltaic solar cells based on crystalline silicon layers. The grating structures have been designed considering both the need for incident light absorption enhancement and the technological feasibility. Long wavelength absorption is increased thanks to the long period (750 nm) back grating, while the incident light reflection is reduced by using a short period (250 nm) front grating.

Design, fabrication and optical characterization of photonic crystal assisted thin film monocrystalline-silicon solar cells.

In this paper, we present the integration of an absorbing photonic crystal within a monocrystalline silicon thin film photovoltaic stack fabricated without epitaxy. Finite difference time domain optical simulations are performed in order to design one- and two-dimensional photonic crystals to assist crystalline silicon solar cells. The simulations show that the 1D and 2D patterned solar cell stacks would have an increased integrated absorption in the crystalline silicon layer would increase of respectively 38% and 50%, when compared to a similar but unpatterned stack, in the whole wavelength range between 300 nm and 1100 nm.

Inappropriate use of D-dimer assay and pulmonary CT angiography in the evaluation of suspected acute pulmonary embolism.

The authors question whether the d-dimer assay and pulmonary computed tomography angiography (CTA) are being used appropriately to evaluate suspected acute pulmonary embolism (PE) at their hospital. To answer this question, a retrospective review was performed on all emergency department (ED) patients who underwent d-dimer assay and/or CTA from August 15, 2008, to August 14, 2009. The authors' algorithm for diagnosing PE requires that patients with low or intermediate probability of acute PE undergo a d-dimer assay, followed by CTA if the d-dimer is positive.

Absorbing one-dimensional planar photonic crystal for amorphous silicon solar cell.

We report on the absorption of a 100nm thick hydrogenated amorphous silicon layer patterned as a planar photonic crystal (PPC), using laser holography and reactive ion etching. Compared to an unpatterned layer, electromagnetic simulation and optical measurements both show a 50% increase of the absorption over the 0.38-0.

Absorption enhancement using photonic crystals for silicon thin film solar cells.

We propose a design that increases significantly the absorption of a thin layer of absorbing material such as amorphous silicon. This is achieved by patterning a one-dimensional photonic crystal (1DPC) in this layer. Indeed, by coupling the incident light into slow Bloch modes of the 1DPC, we can control the photon lifetime and then, enhance the absorption integrated over the whole solar spectrum.

A dynamic upper atmosphere of Venus as revealed by VIRTIS on Venus Express.

The upper atmosphere of a planet is a transition region in which energy is transferred between the deeper atmosphere and outer space. Molecular emissions from the upper atmosphere (90-120 km altitude) of Venus can be used to investigate the energetics and to trace the circulation of this hitherto little-studied region. Previous spacecraft and ground-based observations of infrared emission from CO2, O2 and NO have established that photochemical and dynamic activity controls the structure of the upper atmosphere of Venus.

South-polar features on Venus similar to those near the north pole.

Venus has no seasons, slow rotation and a very massive atmosphere, which is mainly carbon dioxide with clouds primarily of sulphuric acid droplets. Infrared observations by previous missions to Venus revealed a bright 'dipole' feature surrounded by a cold 'collar' at its north pole. The polar dipole is a 'double-eye' feature at the centre of a vast vortex that rotates around the pole, and is possibly associated with rapid downwelling.

Academic Self-Efficacy Beliefs and Quality of Experience in Learning.

This study investigated learning activities and associated quality of experience of students with different levels of perceived academic self-efficacy. Two groups were formed out of 130 Italian adolescents (age 15-19), one with high and one with low academic self-efficacy beliefs (31 and 32 participants, respectively). Students provided valuation of academic pursuits and aspirations, and were monitored for one week with experience sampling method (ESM).

Effects of a fenugreek seed extract on feeding behaviour in the rat: metabolic-endocrine correlates.

Fenugreek seeds (Trigonella foenum graecum L.) are assumed to have restorative and nutritive properties. The present work was designed to investigate the effects of a fenugreek seed extract on feeding behaviour.

[Effects of environmental tobacco smoke on prenatal development. (Review of the medical literature)].

For near thirty years, epidemiological studies have coped with the search of possible noxious consequences of an involuntary exposure of pregnant women to environmental tobacco smoke on the gestation and the intrauterine development of embryo and foetus. These studies were mainly retrospectives; a careful study of the methods used (questionnaires, evaluation of exposure, and so on ..