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loaded Rubber-like Materials Subjected to Small-Amplitude Vibrations

Chinese Journal of Polymer Science 2014年第5期32卷 620-632页

作者： T.Beda J.B.Casimir K.E.Atcholi Y.Chevalier Industrial and Mechanical Engineering department Ecole Nationale Supérieure Polytechnique (ENSP) département de Physique Faculté des Sciences Université de NGaoundéré laboratoire d’Ingénierie des Structures Mécanique et des Matériaux (lISMMA) SUPMECA de Paris institut de Recherche sur les Transports l’Energie et la Société (IRTES EA7274) Laboratoire Systèmes et Transport (SeT EA 3317) Université de Technologie de Belfort-Montbéliard (UTBM)

This paper proposes a constitutive law and a method for characterizing highly preloaded viscoelastic materials subjected to linear （small-amplitude） vibrations. A multiplicative non-separable variables law has been suggested to model the behavior that depends on both stretch and time/frequency. This approach allows splitting the intricate combined test performed simultaneously on both stretch and frequency, generally in a limited experimental domain up to 100 Hz, into two independent tests. Thus, on one hand, the dynamic complex modulus dependent on frequency alone is evaluated on the basis of vibration tests in a large experimental domain up to 100 kHz. On the other hand, energetic parameters are determined from a quasi-static hyperelastic tensile test. The complex modulus, dependent on both stretch and frequency, is then deduced from the results acquired from uncoupled investigations. This work shows that, in extension, the elastic modulus increases with increasing stretch, and the loss factor decreases with increasing stretch; while, in compression, around the material undeformed state, the modulus increases as the stretch increases till a certain value of compression stretch （upturn point depending on material characteristics）, and then the modulus decreases as the stretch increases. Globally, preload rigidifies materials but reduces their damping property. These results closely match a well-known observation in solid mechanics.

关键词： Elastomers Viscoelasticity Hyperelasticity Vibrations Modeling Characterization Combined modulus.

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BEST APPROXIMATION FOR WEIERSTRASS TRANSFORM CONNECTEd WITH SPHERICAl MEAN OPERATOR

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Acta Mathematica Scientia 2012年第2期32卷 455-470页

作者： l.T.Rachdi N.Msehli département de Math'ematiques Facult'e des Sciences de Tunis2092 El-ManarTunisia département de Mathématiques et d'informatique Institut National des Sciences Appliquées et de Technologie de Tunis1080 TunisTunisia

Using reproducing kernels for Hilbert spaces, we give best approximation for Weierstrass transform associated with spherical mean operator. Also, estimates of extremal functions are checked.

关键词： Weierstrass transform spherical mean operator best approximation repro-ducing kernel extremal function

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Evolution of heat transport pathways in the Indonesian Archipelago during last deglaciation

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Chinese Science Bulletin 2002年第22期47卷 1912-1917页

作者： F.Guichard F.Bassinot l.labeyrie China University of Geosciences (Beijing) Beijing China laboratoire des Sciences du Climat et de l’environnement Domaine du CNRS Gif-sur-Yvette France

The Indonesian Archipelago provides important heat transport pathways of the Western Pacific Warm Pool between the northern Indian Ocean and western equatorial Pacific Ocean, that exert important impacts on global climate change. This study investigated AMS 14C, δ18O, planktonic foraminifer assemblages and sedimentation rates in three piston cores collected in the Indonesian Archipelago. The results indicate that changes in the Indonesian Archipelago heat transport pathways were phase characteristic and in steps during the last deglaciation. In the deglaciation Termination IA, at about 12.5 kaBP, sea level rose rapidly in a short time period, and Makassar and lombok straits widened suddenly for warm and fresh water from the Pacific to pour into the Java Sea and eastern Indian Ocean. during the Termination IB, about 9.5 kaBP, sea level rose rapidly again, and the South China Sea (SCS) started to connect with the Java Sea. With monsoon actions, a large amount of fresh water from the SCS shelf area flew

关键词： Indonesian Archipelago last deglaciation heat transport pathways β18O planktonic foraminifer assemblages.

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Small bowel capsule endoscopy and treat-to-target in Crohn’s disease: A systematic review

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World Journal of Gastroenterology 2019年第31期25卷 4534-4554页

作者： Catherine le Berre Caroline Trang-Poisson Arnaud Bourreille institut des Maladies de l’Appareil digestif Nantes University Hospital

BACKGROUNd Crohn’s disease(Cd)can affect the entire gastrointestinal *** small bowel(SB)lesions are associated with a significant risk of stricturing disease and multiple abdominal *** assessment of SB in patients with Cd is therefore necessary because it may have a significant impact on prognosis with potential therapeutic *** of the weak correlation that exists between symptoms and endoscopic disease activity,the“treat-to-target”paradigm has been developed,and the associated treatment goal is to achieve and maintain deep remission,encompassing both clinical and endoscopic *** bowel capsule endoscopy(SBCE)allows to visualize the mucosal surface of the entire *** that time,there is no recommendation regarding the use of SBCE during *** To investigate the impact of SBCE in a treat-to-target strategy in patients with *** An electronic literature search was conducted in PubMed and Cochrane library using the following search terms:“capsule endoscopy”,in combination with“Crohn’s disease”and“treat-to-target”or *** authors independently reviewed titles and abstracts identified by the search strategy after duplicates were *** the initial screening of abstracts,all articles containing information about SBCE in the context of treat-to-target strategy in patients with Cd were ***-text articles were retrieved,reference lists were screened manually to identify additional *** Forty-seven articles were included in this *** indexes are currently used to quantify disease activity using SBCE,and there is good correlation between *** was shown to be useful for disease reclassification in patients who are suspected of having or who are diagnosed with Cd,with a significant incremental diagnostic yield compared to other diagnostic *** studies also demonstrated that the mucosal healing can be evaluated by SBCE to monitor the effect of medical treatment

关键词： Wireless capsule endoscopy Inflammatory bowel disease Treat-to-target Monitoring Mucosal healing Post-operative recurrence Prognosis

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Natural resource scarcity,fossil fuel energy consumption,and total greenhouse gas emissions in top emitting countries

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Geoscience Frontiers 2024年第2期15卷 85-99页

作者： Jiannan Wang Waseem Azam College of Economics and Management South China Agricultural UniversityGuangzhouChina Groupe Ecole de Commerce de lyon LyonFrance institute Supérieur de l’environnement-ISE lYON France

Natural resource scarcity,fossil fuel energy consumption,and total greenhouse gas emissions are critical issues that require immediate *** the global population steadily increasing and economies expanding,the demand for natural resources,particularly fossil fuels,has experienced an unprecedented *** surge in consumption is directly linked to the alarming rise in greenhouse gas *** study examines the nexus between agricultural nitrous oxide emissions and natural resource scarcity,taking into account the dynamics of agriculture,forestry,fishing value addition,fossil fuels,and total greenhouse gas emissions in top-emitting countries between 1971 and *** resource scarcity positively correlates with agriculture,forestry,fishing,fossil fuel energy consumption,and total greenhouse gas *** is a decrease in natural resource scarcity in countries that emit agricultural nitrous oxide,forestry,fishing emissions,fossil fuel energy consumption,and greenhouse gas ***-makers may promote sustainable development,mitigate climate change,and ensure the longterm viability of agricultural systems by addressing the dynamics of agriculture,forestry,and fishing value addition in top-emitting *** strategic policy interventions,supported by technology transfer,capacity building,and market-based instruments,the agricultural,forestry,and fishing sector can achieve a more sustainable future while addressing the challenges of natural resource scarcity.

关键词： Resource scarcity Non-renewable energy CO_(2)emissions Top-emitting countries

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Printing accuracy tracking with 2d optical microscopy and super-resolution metamaterial-assisted 1d terahertz spectroscopy

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npj Flexible Electronics 2020年第1期4卷 178-184页

作者： Mariia Zhuldybina Xavier Ropagnol ChloéBois Ricardo J.Zednik François Blanchard département de génieélectrique École de technologie supérieure(ÉTS)MontréalQCCanada institut national de la recherche scientifique Énergiematériaux et télécommunications(INRS-EMT)VarennesQCCanada institut des Communications Graphiques et de l’imprimabilité MontréalQCCanada Collège Ahuntsic MontréalQCCanada département de génie mécanique École de technologie supérieure(ÉTS)MontréalQCCanada

Printable electronics is a promising manufacturing technology for the potential production of low-cost flexible electronic devices,ranging from displays to active *** is known that rapid printing of conductive ink on a flexible substrate is vulnerable to several sources of variation during the manufacturing ***,this process is still not being subjected to a quality control method that is both non-invasive and in *** address this issue,we propose controlling the printing accuracy by monitoring the spatial distribution of the deposited ink using terahertz(THz)*** parameters studied are the printing speed of an industrial roll-to-roll press with flexography printing units and the pre-calibration compression,or expansion factor,for a pattern printed on a flexible plastic *** pattern,which is carefully selected,has Babinet’s electromagnetic transmission properties in the THz frequency *** validate our choice,we quantified the geometric variations of the printed pattern by visible microscopy and compared its accuracy using one-dimensional THz *** study shows a remarkable agreement between visible microscopic observation of the printing performance and the signature of the THz ***,under specific conditions,one-dimensional(1d)THz information from a resonant pattern can be more accurate than two-dimensional(2d)microscopy *** result paves the way for a simple strategy for non-invasive and contactless in situ monitoring of printable electronics production.

关键词： printing visible pattern

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Numerical simulations of water flow and contaminants transport near mining wastes disposed in a fractured rock mass

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international Journal of Mining Science and Technology 2015年第1期25卷 37-45页

作者： Ben Abdelghani Farouk Aubertin Michel Simon Richard Therrien René department of Civil Engineering Institut Supérieur de la Construction et de l’Urbanisme Research institute on Mines and the Environment (RIME) Polytechnique Montreal department of Geology and Geological Engineering University Laval

A numerical tool, called Hydro-Geosphere, was used to simulate unsaturated water flow and contaminants migration around an open pit filled with mining wastes. Numerical simulations had been carried out to assess the influence of various factors on water flow and solute transport in and around the surface openings including recharge, properties of the waste material and presence of fractures in the surrounding rock mass. The effect of the regional hydraulic gradient was also investigated. The analyses were conducted by simulating various 2d cases using experimentally obtained material properties and controlled boundary conditions. The effects of the hydrogeological properties of the filling material(i.e., water retention curve and hydraulic conductivity function), fracture network characteristics and conductivity of the joints were assessed. The results illustrate that fractures control water flow and contaminants transport around the waste disposal area. A fracture network can desaturate the system and improve the regional gradient effect.

关键词： Hydro-GeosphereNumerical modellingUnsaturated water flowContaminants transportTailingsWaste rocks

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Functional data-driven framework for fast forecasting of electrode slurry rheology simulated by molecular dynamics

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npj Computational Materials 2022年第1期8卷 1524-1532页

作者： Marc duquesnoy Teo lombardo Fernando Caro Florent Haudiquez Alain C.Ngandjong Jiahui Xu Hassan Oularbi Alejandro A.Franco laboratoire de Réactivitéet Chimie des Solides(lRCS) UMR CNRS 7314Universitéde Picardie Jules VerneHub de l’Energie15rue Baudelocque80039AmiensCedexFrance AlISTORE-European Research institute FR CNRS 3104Hub de l’Energie15rue Baudelocque80039AmiensCedexFrance Reseau sur le Stockage Electrochimique de l’Energie(RS2E) FR CNRS 3459Hub de l’Energie15rue Baudelocque80039AmiensCedexFrance institut Universitaire de France 103 Boulevard Saint Michel75005ParisFrance

The computational simulation of the manufacturing process of lithium-ion battery composite electrodes based on mechanistic models allows capturing the influence of manufacturing parameters on electrode ***,ensuring that these properties match with experimental data is typically computationally *** this work,we tackled this costly procedure by proposing a functional data-driven framework,aiming first to retrieve the early numerical values calculated from a molecular dynamics simulation to predict if the observable being calculated is prone to match with our range of experimental values,and in a second step,recover additional values of the ongoing simulation to predict its final *** demonstrated this approach in the context of the calculation of electrode slurries *** report that for various electrode chemistries,the expected mechanistic simulation results can be obtained 11 times faster with respect to the complete simulations,while being accurate with a R^(2)_(score) equals to 0.96.

关键词： properties electrode dynamics

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Endothelin increases the proliferation of rat olfactory mucosa cells

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Neural Regeneration Research 2020年第2期15卷 352-360页

作者： Bertrand Bryche Audrey Saint-Albin Claire le Poupon Schlegel Christine Baly Patrice Congar Nicolas Meunier Neurobiologie de l'olfaction Institut National de Recherche Agronomique (INRA)Université Paris-SaclayJouy-en-JosasFrance Université de Versailles Saint-Quentin en Yvelines Département de BiologieVersaillesFrance

The olfactory mucosa holds olfactory sensory neurons directly in contact with an aggressive environment. In order to maintain its integrity, it is one of the few neural zones which are continuously renewed during the whole animal life. Among several factors regulating this renewal, endothelin acts as an anti-apoptotic factor in the rat olfactory epithelium. In the present study, we explored whether endothelin could also act as a proliferative factor. Using primary culture of the olfactory mucosa, we found that an early treatment with endothelin increased its growth. Consistently, a treatment with a mixture of BQ123 and BQ788(endothelin receptor antagonists) decreased the primary culture growth without affecting the cellular death level. We then used combined approaches of calcium imaging, reverse transcriptase-quantitative polymerase chain reaction and protein level measurements to show that endothelin was locally synthetized by the primary culture until it reached confluency. Furthermore, in vivo intranasal instillation of endothelin receptor antagonists led to a decrease of olfactory mucosa cell expressing proliferating cell nuclear antigen(PCNA), a marker of proliferation. Only short-term treatment reduced the PCNA level in the olfactory mucosa cells. When the treatment was prolonged, the PCNA level was not statistically affected but the expression level of endothelin was increased. Overall, our results show that endothelin plays a proliferative role in the olfactory mucosa and that its level is dynamically regulated. This study was approved by the Comité d’éthique en expérimentation animale COMetHEA(COMetHEA C2 EA-45;protocol approval #12-058) on November 28, 2012.

关键词： autocrine factor cell culture cellular dynamics endothelin olfaction olfactory basal cells olfactory epithelium olfactory mucosa primary culture

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Ordered mesoporous Sn-SBA-15 as support for Pt catalyst with enhanced performance in propane dehydrogenation

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Chinese Journal of Catalysis 2017年第4期38卷 726-735页

作者： Bing li Zhenxin Xu Wei Chu Shizhong luo Fangli Jing School of Chemical Engineering Sichuan University Chengdu 610065 Sichuan China institut de Chimie et Procédés pour l'Energie l'Environnement et la Santé (ICPEES) UMR 7515 CNRS‐Université de Strasbourg (UdS) 25 rue Becquerel67087 Strasbourg Cedex 08 France

A series of Sn‐incorporated SBA‐15materials with high specific surface areas and highly orderedmesoporous structures were synthesized by a facile one‐pot method and used as catalyst supports.A reference sample was also prepared using a conventional impregnation *** catalystswere characterized using various methods,and their activities in propane dehydrogenation *** incorporation of Sn into the SBA‐15matrix led to strong interactions between Snspecies and the support,and these helped to maintain the oxidation states of Sn species during *** with Sn changed the interfacial properties of the Pt species and improved thefunction and effect of the Sn *** catalytic activities and stabilities of the Pt catalysts supportedon Sn‐incorporated SBA‐15were better than those of the impregnated ***,thecatalytic performance deteriorated when an excessive amount of Sn was introduced and the interactionsamong Pt,Sn species,and the support became *** Pt/0.5Sn‐SBA‐15catalyst gavethe best propene selectivity,i.e.,98.5%,with a corresponding propane conversion of about43.8%.

关键词： Propane dehydrogenation One‐pot hydrothermal synthesis Sn‐incorporated SBA‐15 Pt‐based catalyst Structure activity relationship

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