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Experimental and Numerical Analysis of a PCM-Integrated Roof for Higher Thermal Performance of Buildings

Journal of Thermal Science 2024年第2期33卷 522-536页

作者： SIMON françois RUIZ-VALERO Letzai GIRARD Aymeric GALLEGUILLOS Hector Centro de Desarrollo Urbano Sustentable(CEDEUS) Pontificia Universidad Católica de Chile7500000SantiagoChile Facultad de Ciencias e Ingeniería Pontificia Universidad Católica Madre y Maestra(PUCMM)10103Santo DomingoDominican Republic LMGC IMT Mines AlesUniv MontpellierCNRS30100AlèsFrance Facultad de Ingeniería y Ciencias Universidad Adolfo Ibañez2520000Viña del MarChile Centro de Desarrollo Energético Antofagasta(CDEA) Universidad de Antofagasta1240000AntofagastaChile

Phase change materials(PCMs) designate materials able to store latent *** change state from solid to liquid over a defined temperature *** process is reversible and can be used for thermo-technical *** present paper aims to study the thermal performance of an inorganic eutectic PCM integrated into the rooftop slab of a test room and analyze its potential for building thermal *** experiment is conducted in two test rooms in Antofagasta(Chile) during summer,fall,and *** PCM is integrated into the rooftop of the first test room,while the roof panel of the second room is a sealed air *** work introduces a numerical model,which is built using the finite difference method and used to simulate the rooms' thermal *** thermal simulations of the PCM room are performed for other Chilean locations to evaluate and compare the capability of the PCM panel to store latent heat thermal energy in different *** show that the indoor temperature of the PCM room in Antofagasta varies only 21.1℃±10.6℃,while the one of the air-panel room varies 28.3℃±18.5℃.Under the experiment's conditions,the PCM room's indoor temperature observes smoother diurnal fluctuations,with lower maximum and higher minimum indoor temperatures than that of the air-panel *** simulations in other cities show that the PCM panel has a better thermal performance during winter,as it helps to maintain or increase the room temperature by some degrees to reach comfort *** demonstrates that the implementation of such PCM in the building envelope can effectively reduce space heating and cooling needs,and improve indoor thermal comfort in different climates of Chile.

关键词： phase change material thermal energy storage building space heating and cooling energy efficiency designbuilder

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COVID-19 and flu:conserved or specific immune signature?

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Cellular & Molecular Immunology 2021年第2期18卷 245-246页

作者： Christophe Paget françois Trottein Centre d’Etude des Pathologies Respiratoires INSERM U1100Universitéde ToursFacultéde Médecine de Tours37000ToursFrance Centre d’Infection et d’Immunitéde Lille INSERM U1019CNRS UMR 9017Universitéde LilleCHU LilleUMS 2014-PLBSU1019Institut Pasteur de Lille59000LilleFrance

Respiratory viruses are a major cause of infectious disease and mortality *** respiratory viruses,emerging and well-known coronaviruses and influenza viruses cause seasonal epidemics and pandemics and rank as very important *** clinical signs of viral respiratory infections range from asymptomatic forms to life-threatening acute respiratory distress syndrome(ARDS,associated with a high mortality rate).Another reported cause of mortality is multiple organ *** ongoing pandemic of coronavirus disease 19(COVID-19,caused by severe acute respiratory syndrome coronavirus 2(SARS-CoV-2))is a serious public health ***-CoV-2 infection induces to a clinical signature distinct from that associated with other types of pneumonia,and SARS-CoV-2 differs from influenza viruses with regard to target cells and replicative *** morbidity and mortality rates are higher for COVID-19 than for seasonal influenza.

关键词： mortality acute respiratory

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Deep excavation of the impact from endogenous and exogenous uncertaintieson long-term energy planning

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Energy and AI 2023年第1期11卷 150-160页

作者： Xiang Li françois Maréchal Industrial Process and Energy Systems Engineering Ecole Polytechnique Fédérale de LausanneRue de l’industrie 17Sion1950Switzerland

Endogenous and exogenous uncertainties exert significant influences on energy planning. In this study,we propose a systematic methodology to excavate the uncertainty space, by combining mix-integer linearprogramming (MILP), Monte Carlo simulation, and machine learning for quantification of the uncertaintyimpacts on a national-level energy system from global and local perspectives. This approach allows in-depthcorrelation analysis highlighting potential synergies and risks in the energy transition, and can be easily applie for assisting policy making. The case study for Switzerland shows that both carbon neutrality (even negativeemissions) and energy autonomy can be achieved by 2050, but the energy system’s configuration variessignificantly under uncertainty. Through conditional distribution analyses, carbon capture and storage (CCS),Photovoltaic (PV), and wood gasification show the most strong correlation for decarbonization. This study isbased on the whole uncertainty space taking into account heterogeneous uncertainties, leading to increasedreliability compared to sensitivity analysis from single scenarios’ comparisons. The synergy between energymodels and artificial intelligence (AI) is promising to be widely applied in energy planning area, particularlyfor emerging technologies with large uncertainty in development.

关键词： Uncertainty Energy planning Monte Carlo simulation Machine learning

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Sensitivity Analysis and Computations of the Time RelaxationModel

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Advances in Applied Mathematics and Mechanics 2015年第1期7卷 89-115页

作者： Monika Neda fran Pahlevani Jiajia Waters Department of Mathematics University of NevadaLas VegasNV 89154USA Department ofMathematics Penn State University-Abington CollegePA 19001USA

This paper presents a numerical study of the sensitivity of a fluid model known as time relaxation model with respect to variations of the time relaxation coefficient *** sensitivity analysis of this model is utilized by the sensitivity equation method and uses the finite element method along with Crank Nicolson method in the fully discretization of the partial differential *** present a test case in support of the sensitivity convergence and also provide a numerical comparison between two different strategies of computing the sensitivity,sensitivity equation method and forward finite differences.

关键词： Sensitivity analysis time relaxation model Navier-Stokes equations finite element method.

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Hepatocyte nuclear factor 4-alpha involvement in liver and intestinal inflammatory networks

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World Journal of Gastroenterology 2014年第1期20卷 22-30页

作者： Jean-Philippe Babeu franois Boudreau Département d’ Anatomie et de Biologie Cellulaire Faculté de Médecine et des Sciences de la SantéUniversité de SherbrookeSherbrooke J1E 4K8QuébecCanada

Hepatocyte nuclear factor 4-alpha (HNF4-α) is a nuclear receptor regulating metabolism, cell junctions, differentiation and proliferation in liver and intestinal epithelial cells. Mutations within the HNF4A gene are associated with human diseases such as maturity-onset diabetes of the young. Recently, HNF4A has also been described as a susceptibility gene for ulcerative colitis in genome-wide association studies. In addition, specific HNF4A genetic variants have been identified in pediatric cohorts of Crohn’s disease. Results obtained from knockout mice supported that HNF4-α can protect the intestinal mucosae against inflammation. However, the exact molecular links behind HNF4-α and inflammatory bowel diseases remains elusive. In this review, we will summarize the current knowledge about the role of HNF4-α and its isoforms in inflammation. Specific nature of HNF4-α P1 and P2 classes of isoforms will be summarized. HNF4-α role as a hepatocyte mediator for cytokines relays during liver inflammation will be integrated based on documented examples of the literature. Conclusions that can be made from these earlier liver studies will serve as a basis to extrapolate correlations and divergences applicable to intestinal inflammation. Finally, potential functional roles for HNF4-α isoforms in protecting the intestinal mucosae from chronic and pathological inflammation will be presented.

关键词： Hepatocyte nuclear factor 4-alpha Inflammatory bowel diseases Colitis-associated cancer Gastrointestinal tract Intestinal epithelium barrier Inflammation

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Humus: Dark side of life or intractable “aether”?

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Pedosphere 2022年第4期32卷 660-664页

作者： Jean-françois PONGE Muséum National d'Histoire Naturelle CNRS UMR 7179Brunoy 91800France

Dear Editor,Johannes Lehmann and Markus Kleber,in a controversial paper entitled"The contentious nature of soil organic matter"(Lehmann and Kleber,2015),suggested the abandonment of the term"humus"and other associated terms such as"humic","humir","humified","humification".The first reason they cited was that these labels are only instrumental in outdated soil analytical methods,which are based on alkaline extraction of soil organic matter(SOM).

关键词： soil humic life

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Assessment of a Multimodal Strategy for Information and Collection of Advance Directives in a Comprehensive Cancer Center:Description of the Study Protocol

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Psycho-Oncologie 2024年第4期18卷 367-375页

作者： Léonor Fasse françois Blot Laboratoire Psychopathologie et Processus de Santé(UR 4057) Institut de PsychologieUniversitéParis CitéBoulogne92100France Département Interdisciplinaire d’Organisation du Parcours Patient Institut Gustave RoussyUniversitéParis SaclayVillejuif94805France

Background:Information on the possibility of drawing up Advance Directives(AD)is a necessity,and represents a major medical,ethical,and legal *** difficulties are numerous,both organizational and cultural,and this is also true in the context of oncology,where ADs(and more broadly,advanced palliative care)are of critical *** an eminently sensitive subject,dealing with ADs(and therefore with end-of-life issues)requires both societal and medical/health-care *** institutional approach has therefore been developed,to deploy information tools,training professionals,and formalize the collection of *** an approach cannot be implemented without an assessment not only of its objective results but also above all of its psychological effects,on both users(patients,family caregivers)and ***:This longitudinal study,based on a mixed-method,interdisciplinary approach,will assess the impact of this information dissemination on AD,in terms of both potential positive and negative effects,using validated measurement ***,this study follows the 5 criteria of the RE-AIM model,designed to analyze the interest and impact of a device intended for users of the healthcare system;we will use a mixed methodology,relying on both a quantitative component(counting the number of people benefiting from the scheme,and those requesting support in drawing up their DA...,administering questionnaires),as well as a qualitative component(focus groups)which will enable us to study the subjective experiences of users,their relatives and the professionals involved in the ***:The results of this study will make it possible to determine the effects of this system of assistance in the drafting of ADs,which is currently being promoted by the legislator,but which is struggling to be implemented.

关键词： Advance directive cancer palliative care living wills end of life shared-decision making

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Past Successes and New Challenges:China's Foreign Trade at a Turning Point

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China & World Economy 2010年第3期18卷 1-23页

作者： franoise Lemoine the CEPII Paris

Since 1979, China has recorded a remarkable trade performance, which has been driven by international processing and the offshoring strategies of foreign firms. The diversification of Chinese exports and their technological upgrading have been phenomenal However, there is also inertia, illustrated by the persistent dualism of the trade sector, the unrelenting specialization in downmarket products and the deteriorating terms of trade. These weaknesses have helped its partners to adjust to the rise of this new trade power. In the past decade, China＇s economy has faced the adverse effects o fan export-led growth and the global crisis has revealed its vulnerability. China is now forced to rebalance its economy. This will imply major changes in foreign trade, in favor of ordinary trade and away from processing. In the foreseeable future, China is unlikely to become the driver of international demand but will remain the engine of Asian economic integration.

关键词： China foreign trade technology terms of trade

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Numerical Investigation of Flutter Stability in Subsonic Space Turbine Blisk with Emphasis on Cut-on/Cut-off Modes and Interblade Phase Angles

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Journal of Thermal Science 2012年第6期21卷 492-499页

作者： Hakim Ferria Pascal Ferrand franois Pacull Stéphane Aubert Laboratoire de Mécanique des Fluides et d'Acoustique CNRS UMR 5509 Université de LyonUniversité Claude Bernard Lyon 1INSA Lyon 36avenue Guy de Collongue69134 EcullyFrance Fluorem 64 chemin des Mouilles69134 EcullyFrance

The so-called blisks,*** bladed disks,are characterized by very low viscous material damping and make the flutter prediction much more *** that framework,a two-dimensional numerical study of a space turbine blisk featuring complex deformation of blades and high eigenfrequency(>40kHz)is *** simulations are based on unsteady Reynolds Averaged Navier Stokes computations linearized in the frequency domain and consist in the superposition of an unsteady linear(in time)pressure field,generated by a harmonic perturbation,upon a steady nonlinear(in space)*** aerodynamic damping coefficient is calculated over a range of nodal diameters,and the blades are predicted aeroelastically ***,violent changes occur and are rather critical since sudden and large deviations in stability *** that context,the nature of the waves propagating from the cascade are *** an approach provides fundamental knowledge about the perturbations which can either propagate to the far-field(cut-on mode)or decay(cut-off mode).It is expected that the ability of the flow to damp or to amplify the blade motion is strongly affected by the way unsteady perturbations are transferred from the cascade to the *** nature of the waves are first assessed from the aforementioned linearized results,then they are evaluated analytically and finally compared.A good agreement is found despite the strong assumptions of the analytical *** results show a clear correlation between the cut-on/cut-off conditions and *** least stable configuration corresponds to cut-off mode at the inlet and no wave at the *** outgoing waves from the cascade,the blade is prone to be less stable:the energy from the blades vibration is necessarily dissipated or sent out by the cascade.

关键词： subsonic flutter LRANS blisk cut-on/cut-off mode interblade phase angle nodal diameter.

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Optically powered gas monitoring system using single-mode fibre for underground coal mines

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International Journal of Coal Science & Technology 2022年第2期9卷 36-47页

作者： Yingge Chen Leonardo Silvestri Xinyue Lei françois Ladouceur School of Electrical Engineering and Telecommunications University of New South WalesSydneyNSW 2052Australia

We present an optically powered,intrinsically safe gas monitoring system to measure four essential environmental gases(CH_(4),CO_(2),CO and O_(2)),together with ambient temperature and pressure,for underground *** system is based on three key technologies developed at UNSW:(1)power-over-fbre(PoF)at 1550 nm using a single industry-standard,low-cost single-mode fbre(SMF)for both power delivery and information transmission,(2)liquid–crystal-based optical transducers for optical telemetry,and(3)ultra-low power consumption design of all ***,this approach allows each gas monitoring station to operate with less than 150 mW of optical power,meeting the intrinsic safety requirements specifed by the IEC60079-28 standard.A 2-month feld trial at BMA’s Broadmeadow underground mine proved the cabling compatibility to the mine’s existing optical network and the stability of the system *** with conventional electrically powered gas sensors,this technology bypasses the usual roadblocks of underground gas monitoring where electrical power is either unsafe or ***,using one fbre for both power delivery and communication enables longer distance coverage,reduces optical cabling and increases multiplexing possibilities and data throughput for better awareness of underground environment.

关键词： Power-over-fbre Ultra-low power consumption Gas monitoring Intrinsic safety Single-mode fbre Optical transducer

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