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Cross-sectional associations between cortical thiclmess and physical activity in older adults with spontaneous memory complaints:The MAPT Study

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Journal of Sport and Health Science 2023年第3期12卷 324-332页

作者： Jérémy Raffin Yves Rolland Clara Fischer Jean-Francois Mangin Audrey Gabelle Bruno Vellas Philipe de Souto Barreto the MAPT/DSA Group Gérontopôle de toulouse Institut du VieillissementCentre Hospitalo-Universitaire de ToulouseToulouse 31000France universitéPaul-Sabatier/Institut National de la Santéet de la Recherche Médicale UnitéMixte de Recherche 1027 Facultéde médecineUniversity of Toulouse ⅢToulouse 31000France Centre pour l'Acquisition et le Traitement des Images Multicenter Neuroimaging Platform NeurospinUniversitéParis-SaclayGif sur Yvette 91191France Memory Resources and Research Center Montpellier University HospitalMontpellier 34295France Institut National de la Santéet de la Recherche Médicale Unité1061 i-site Montpellier universitéd'Excellence University of MontpellierMontpellier 34090France 不详

Background:Age-related changes in brain structure may constitute the starting point for cerebral function *** activity(PA)demonstrated favorable associations with total brain volume,but its relationship with cortical thickness(CT)remains *** investigated the cross-sectional associations between PA level and CT in community-dwelling people aged 70 years and ***:A total of 403 older adults aged 74.8±4.0 years(mean±SD)who underwent a baseline magnetic resonance imaging examination and who had data on PA and confounders were *** was assessed with a *** were categorized according to PA *** linear regressions were used to compare the brain CT(mm)of the inactive group(no PA at all)with 6 active groups(growing PA levels)in 34 regions of ***:Compared with inactive persons,people who achieved PA at a level of 1500-1999 metabolic equivalent task-min/week(i.e.,about6-7 h of brisk walking for exercise) and those who achieved it at 2000-2999 metabolic equivalent task-min/week(i.e.,8-11 h of brisk walking for exercise)had higher CT in the fusiform gyrus and the temporal ***,dose-response associations between PA and CT were found in the fusiform gyrus(B=0.011,SE=0.004,adj.p=0.035),the temporal pole(B=0.026,SE=0.009,adj.p=0.048),and the caudal middle frontal gyrus,the entorhinal,medial orbitofrontal,lateral occipital,and insular ***:This study demonstrates a positive association between PA level and CT in temporal areas such as the fusiform gyrus,a brain region often associated to Alzheimer’s disease in people aged 70 years and *** investigations focusing on PA type may help to fulfil remaining knowledge gaps in this field.

关键词： Alzheimer's disease Brain aging Cortical thickness Physical activity

A passive optical fibre sensor based on Fabry-Perot interferometry for bipolar electrostatic monitoring of insulating dielectrics

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High Voltage 2023年第4期8卷 682-689页

作者： Jiawei Zhang Zifan Ye Li Wang Zelei Zhang Fan Xu Weichen Dang Takao Matsumoto Sombel Diaham Chatchai Putson School of Electrical Engineering Xi'an University of TechnologyXi'anShaanxiChina universitéde toulouse UPSINPTLAPLACE(Laboratoire Plasma et Conversion d'Energie)Toulouse Cedex 9France Materials Physics Laboratory Department of PhysicsFaculty of SciencePrince of Songkla University(PSU)SongkhlaThailand

The measurement of the surface charge on the insulating dielectrics is critical to estimate the insulation strength of electrical equipment in *** interactions with the electromagnetic field,however,generally result in distortion measurement of active ***,it is of great significance to investigate a passive sensor for monitoring the deposited ***,a passive optical fibre electrostatic sensor is developed on the principle of Fabry–Perot interference to quantify the surface potential of the insulating *** sensitivity of quantifying the electrostatic charge is explored in terms of the wavelength shift in the interference spectrum,and the linear correlation is ***,the sensor can identify a negative quadratic trend with the increase of the surface roughness of the insulating *** merits of the proposed sensor such as passive monitoring,bipolar electrostatic detection,and the excellent ability of antielectromagnetic interference are highlighted in the ***,this sensor can serve as an effective tool to monitor the electrostatic charge in the fields of smart electrical equipment,fuel transportation,aerospace,integrate circuit etc.

关键词： electrostatic passive fibre

Dependency-aware unequal erasure protection codes

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Journal of Zhejiang university-Science A(Applied Physics & Engineering) 2006年第Z1期7卷 27-33页

作者： BOUABDALLAH Amine LACAN Jérme Laboratory for Analysis and Architecture of Systems toulouse 31077 France Applied Mathematics and Computer Science DepartmentENSICAToulouse 31056France Telecommunications for Space and AeronauticToulouse 31000France

Classical unequal erasure protection schemes split data to be protected into classes which are encoded independently. The unequal protection scheme presented in this paper is based on an erasure code which encodes all the data together according to the existing dependencies. A simple algorithm generates dynamically the generator matrix of the erasure code according to the packets streams structure, i.e., the dependencies between the packets, and the rate of the code. This proposed erasure code was applied to a packetized MPEG4 stream transmitted over a packet erasure channel and compared with other classical protection schemes in terms of PSNR and MOS. It is shown that the proposed code allows keeping a high video quality-level in a larger packet loss rate range than the other protection schemes.

关键词： Data dependencies integration Unequal erasure protection (UEP) Lossy networks Reliable video transmissions MPEG4 video codec

LED Flicker: A Drawback or an Opportunity?

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Optics and Photonics Journal 2013年第1期3卷 63-66页

作者： Spiros Kitsinelis Lydie Arexis-Boisson Yuan Zhang Georges Zissis université de toulouse Toulouse France

In this paper we examine the flicker of commercial LED lamps and with the help of volunteers we explore the parameter space (frequency and duty cycle) in order to find pulsing operating conditions under which the light fluctuations are not visually perceived. The results show that LEDs under mains voltage manifest the most extreme cases of flicker and we also confirm that under pulsing mode the overall impression is of higher brightness which is an opportunity for energy savings. The results also show that the background color and luminance contrast is of high importance. Finally we propose an easy method for consumers to detect flickering of light sources under mains voltage.

关键词： Flicker Pulse LED

Numerical Analysis of the Tip Leakage Flow Field in a Transonic Axial Compressor with Circumferential Casing Treatment

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Journal of Thermal Science 2010年第3期19卷 198-205页

作者： G.Legras N.Gourdain I.Trebinjac LMFA-UMR CNRS 5509 Ecole Centrale de Lyon /Université Lyon 1 /INSA69134EcullyFrance CERFACS Computational Fluid Dynamics Team31057ToulouseFrance

This paper reports on numerical investigations aimed at understanding the influence of circumferential casing grooves on the tip leakage flow and its resulting vortical *** results and conclusions are based on steady state 3D numerical simulations of the well-known transonic axial compressor NASA Rotor 37 near stall operating *** calculations carried out on the casing treatment configuration reveal an important modification of the vortex topology at the rotor tip *** grooves limit the expansion of the tip leakage vortex in the direction perpendicular to the blade chord,but generate a set of secondary tip leakage vortices due to the interaction with the leakage mass ***,a deeper investigation of the tip leakage flow is proposed.

关键词： transonic axial compressor casing treatment circumferential groove tip leakage vortex

A comparative study of two formal semantics of the SIGNAL language

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Frontiers of Computer Science 2013年第5期7卷 673-693页

作者： Zhibin YANG Jean-Paul BODEVEIX Mamoun FILALI School of Computer Science and Engineering Beihang University Beijing 100191 China IRIT-CNRS Universite de Toulouse Toulouse 31062 France

SIGNAL is a part of the synchronous languages family, which are broadly used in the design of safety-critical real-time systems such as avionics, space systems, and nu- clear power plants. There exist several semantics for SIG- NAL, such as denotational semantics based on traces （called trace semantics）, denotational semantics based on tags （called tagged model semantics）, operational semantics presented by structural style through an inductive definition of the set of possible transitions, operational semantics defined by syn- chronous transition systems （STS）, etc. However, there is lit- tle research about the equivalence between these semantics. In this work, we would like to prove the equivalence be- tween the trace semantics and the tagged model semantics, to get a determined and precise semantics of the SIGNAL language. These two semantics have several different defini- tions respectively, we select appropriate ones and mechanize them in the Coq platform, the Coq expressions of the abstract syntax of SIGNAL and the two semantics domains, i.e., the trace model and the tagged model, are also given. The dis- tance between these two semantics discourages a direct proof of equivalence. Instead, we transform them to an intermediate model, which mixes the features of both the trace semantics and the tagged model semantics. Finally, we get a determined and precise semantics of SIGNAL.

关键词： synchronous language SIGNAL trace seman- tics tagged model semantics semantics equivalence Coq

Particulate matter characterization in a steelworks using conventional sampling and innovative lidar observations

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Particuology 2016年第5期14卷 43-51页

作者： Benjamin Guinot Beatriz Gonzalez Julia Perim De Faria Sumita Keclia Laboratoire d'Aerologie Universite de Toulouse CNRS Universite Paul-Sabatier 14 Avenue Edouard-Belin 31400 Toulouse France

Particulate matter （PM） emissions from steelworks cause public concern. Although end-of-pipe and pro- cess integrated measures have led to a significant drop in emissions of large particles from stacks, fine aerosols were not specifically considered, nor were emissions from fugitive and open sources. In this study, we deployed aerosol samplers together with a scanning ultra-violet （UV） lidar to characterize total suspended particles （TSP）, PM10, and PM2.5, in emissions from a large integrated steelworks in Spain over a 16-day period. We determined the content of carbonaceous, soluble inorganic, mineral dust, and metal species. A positive matrix factorization was carried out on our dataset. Despite mineral dust being predominant in all size fractions, the steelworks was clearly a source of carbonaceous species, resulting in production of secondary inorganic aerosols. In particular, stack emissions were a major contributor of fine particles, while open sources dominated the emissions of TSP, yielding up to 80% of particles larger than PM10. UV lidar provided 2D maps of aerosols in real time, with an ability to detect PM emissions and to visualize complex plumes. We suggest that air quality management of steelworks needs to focus on controlling large and coarse oarticle emissions, esoeciallv those from onen sources.

关键词： Fine aerosols Fugitive emissions Open sources Chemical composition Trace metals UV lidar

Suicidal Ideation and Attempts during Middle Childhood: Associations with Subjective Quality of Life and Depression

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Open Journal of Medical Psychology 2013年第3期2卷 93-100页

作者： Sylvie Bourdet-Loubère Jean-Philippe Raynaud CHU de toulouse Toulouse France Laboratoire LCPI Université Toulouse II Toulouse France

Background: Confronted to the increasing suicide rate in children, clinicians have to better understand and predict suicide-related behaviours (SRBs) in children with and without depressive symptoms. Aims: To investigate associations among suicidal tendencies (thoughts and/or attempts), depression and children’s perceptions of subjective quality of life. Methods: This was a cross-sectional study of 157 children of 6 - 13-year-old. Results: Children who attempted or thought of suicide reported goodless subjective quality of life than nonsuicidal children did, and children who thought of or attempted suicide reported higher levels of depressive symptoms than nonsuicidal children. Limitations: A more rigorous approach to investigating suicidal ideation and depressive symptomatology as a diagnostic interview based on the DSM-IV-TR will be valuable to future progress in understanding children’s suicidality. Conclusions: Results may reflect the confirmation of depressive symptoms as risk factors for suicidality and underline the high importance of social and emotional life context among suicidal children. For this reason, more effective recognition and comprehension of the underlying affective and social conditions of children with suicidality have special importance to prevent future suicidal behaviour during adolescence.

关键词： Suicide Ideation Suicide Attempt Subjective Quality of Life Depression Children

SYSTEMS ENGINEERING RESEARCH

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Journal of Systems Science and Systems Engineering 2008年第3期17卷 319-333页

作者： Abd-El-Kader SAHRAOUI Dennis M.BUEDE Andrew P.SAGE LAAS-CNRS and universitéde toulouse 7 Avenue du Colonel Roche Toulouse31077France Innovative Decisions Inc.2139 Golf Course Dr.RestonVA 20191 USA Dept.of Systems Engineering and Operations Research George Mason UniversityFairfaxVA 22030 USA

In this paper, we propose selected research topics that are believed central to progress and growth in the application of systems engineering （SE）. As a professional activity, and as an intellectual activity, systems engineering has strong links to such associated disciplines as decision analysis, operation research, project management, quality management, and systems design. When focussing on systems engineering research, we should distinguish between subjects that are of systems engineering essence and others that more closely correspond to those that are more relevant for related disciplines.

关键词： Systems engineering systems of systems requirements engineering systems families