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Origami-Based Design for 4D Printing of 3D Support-Free Hollow Structures

Engineering 2022年第5期8卷 70-82页

作者： Bingcong Jian Frederic Demoly Yicha Zhang H.Jerry Qi Jean-Claude Andre Samuel Gomes Laboratoire Interdisciplinaire Carnot de bourgogne UMR 6303 Centre National de la Recherche Scientifique&Universitede Technologie de Belfort-MontbeliardUniversite Bourgogne Franche-ComteBelfort 90400France George W.Woodruff School of Mechanical Engineering Georgia Institute of TechnologyAtlantaGA 30332USA Laboratoire Reactions et Genie des Procedes UMR 7274 Centre National de la Recherche Scientifique-Universitede LorraineNancy 54001France

The integration of additive manufacturing(AM)in design and engineering has prompted a wide spectrum of research efforts,involving topologically optimized solid/lattice structures,multimaterial structures,bioinspired organic structures,and multiscale structures,to name a ***,except for obvious cases,very little attention has been given to the design and printing of more complex three-dimensional(3D)hollow structures or folded/creased *** of the main reasons is that such complex open or closed 3D cavities and regular/freeform folds generally lead to printing difficulties from support-structure-related *** address this barrier,this paper aims to investigate four-dimensional(4D)printing as well as origami-based design as an original research direction to design and build 3D support-free hollow *** work consists of describing the rough 3D hollow structures in terms of two-dimensional(2D)printed origami precursor layouts without any support *** origami-based definitions are then embodied with folding functions that can be actuated and fulfilled by 3D printed smart *** desired 3D shape is then built once an external stimulus is applied to the active materials,therefore ensuring the transformation of the 2D origami layout to 3D *** demonstrate the relevance of the proposal,some illustrative cases are introduced.

关键词： Origami-based design 4D printing Smart material Hollow 3D structures Additive manufacturing

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L-carnitine protects C2C12 cells against mitochondrial superoxide overproduction and cell death

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World Journal of Biological Chemistry 2017年第1期8卷 86-94页

作者： Francoise Le Borgne Gaetan Ravaut Arnaud Bernard Jean Demarquoy universitede bourgogne-UFR SVTE Facultedes Science Gabriel

AIM To identify and characterize the protective effect that L-carnitine exerted against an oxidative stress in C2C12 *** Myoblastic C2C12 cells were treated with menadione, a vitamin K analog that engenders oxidative stress, and the protective effect of L-carnitine(a nutrient involved in fatty acid metabolism and the control of the oxidative process), was assessed by monitoring various parameters related to the oxidative stress, autophagy and cell death. RESULTS Associated with its physiological function, a muscle cell metabolism is highly dependent on oxygen and may produce reactive oxygen species(ROS), especially under pathological conditions. High levels of ROS are known to induce injuries in cell structure as they interact at many levels in cell function. In C2C12 cells, a treatment with menadione induced a loss of transmembrane mitochondrial potential, an increase in mitochondrial production of ROS; it also induces autophagy and was able to provoke cell death. Pre-treatment of the cells with L-carnitine reduced ROS production, diminished autophagy and protected C2C12 cells against menadione-induced deleterious effects. CONCLUSION In conclusion, L-carnitine limits the oxidative stress in these cells and prevents cell death.

关键词： Superoxide anions Mitochondria Reactive Autophagy Muscle Carnitine Oxygen species Cell death

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Photo-thermal synergistic excitation:Feasible strategy to detect ethanol for wide bandgap ZIF-8at low work temperature

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Journal of Environmental Sciences 2024年第4期138卷 112-120页

作者： Shuhao Shi Qian Du Ming Hou Xiaolei Ye Li Yang Shenghui Guo Jianhong Yi Ullah Ehsan Hongbo Zeng State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Faculty of Metallurgical and Energy EngineeringKunming University of Science and TechnologyKunming 650093China Department of Chemical and Materials Engineering University of AlbertaEdmonton T6G 2V4Canada FEMTO-ST Institute(UMR CNRS 6174) Universite de Bourgogne Franche-Comte(UBFC)Universite de technologie de Belfort Montbéliard(UTBM)Site de MontbeliardBelfort F-90010France Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China

Zeolitic Imidazolate Framework-8(ZIF-8)material was prepared by chemical precipitation *** microstructure and physical properties of the as-prepared samples were characterized by XRD,BET,FESEM and UV *** self-made four-channel measurement device was used to test the gas sensitivity of ZIF-8 material toward ethanol gas under photo-thermal synergistic *** results showed that the sample was typical ZIF-8(E_(g)=4.96 eV)with a regular dodecahedron shape and the specific surface is up to 1793 m^(2)/*** as-prepared ZIF-8 has a gas response value of 55.04 to 100 ppm ethanol at 75℃ and it shows good gas sensing selectivity and repeated *** excellent gas sensitivity can be attributed to the increase of free electron concentration in the ZIF-8 conduction band by photo-thermal synergistic excitation,and the large specific surface area of ZIF-8 material provides more active sites for gas-solid surface *** reaction mechanism of ZIF-8 material under multi-field excitation was also discussed.

关键词： ZIF-8 material Photo-thermal synergistic excitation UV-light irradiation Photon-generated electron and hole Gas-sensitive property

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Relaxor behaviour and phase transition of perovskite ferroelectrics-type complex oxides(1–x)Na_(0.5)Bi_(0.5)TiO_3–xCaTiO_3 system

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Journal of Advanced Ceramics 2018年第2期7卷 124-142页

作者： Roy ROUKOS Nissrine ZAITER Denis CHAUMONT Laboratoire Interdisciplinaire Carnot de bourgogne UMR 6303 CNRS Université de Bourgogne

Polycrystalline powders of (1–x)Na_(0.5)Bi_(0.5)TiO_3–xCaTiO_3 ((1–x)NBT–xCT, 0 ≤ x ≤ 0.55) have been synthesized by solid state route. The effects of simultaneous substitution of Na^+/Bi^(3+) at A-site in NBT on structural and dielectric properties were investigated. X-ray diffraction analysis revealed the phase transition from rhombohedral structure(x = 0) to orthorhombic structure(x ≥0.15). A distinct behaviour in dielectric properties was obtained, where for x = 0, a normal ferroelectric behaviour was observed, whereas for x ≥ 0.15, a broad dielectric anomaly was revealed such that the maximum temperature(T_m) strongly depended on the frequency and shifted towards low temperature with CT. The dielectric dispersion indicated a relaxor behaviour revealed by the degree of diffuseness and modelled via Vogel–Fulcher relation. The study highlighted the relaxor behaviour as a function of frequency and proved the transformation from a relaxor high-frequency dependence to a paraelectric phase at temperature T_s. The distinct variation of the Raman spectra at room temperature was correlated with X-ray diffraction results and proved the already mentioned transition. On heating(-193–500 ℃), the Raman spectra confirmed the structural stability(Pnma) of the materials. The phonon behaviour for x = 0.15 was discussed in terms of the appearance of polar nanoregions(PNRs) into a non-polar orthorhombic matrix responsible of the relaxor behaviour. For x = 0.20, unchanged phonon behaviour confirmed the variation in dielectric behaviour where the solids transformed from a relaxor to a paraelectric state without structural phase transition.

关键词： relaxor behaviour dielectric properties Vogel–Fulcher relationship polar nanoregions (PNRs) X-ray diffraction Raman spectroscopy

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Nash Embedding,Shape Operator and Navier-Stokes Equation on a Riemannian Manifold

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Acta Mathematicae Applicatae Sinica 2020年第2期36卷 237-252页

作者： Shizan FANG Institut de Mathematiques de bourgogne UMR 5584 CNRSUniversite de Bourgogne Franche-ComteF-21000 DijonFrance

What is the suitable Laplace operator on vector fields for the Navier-Stokes equation on a Riemannian manifold?In this note,by considering Nash embedding,we will try to elucidate different aspects of different Laplace operators such as de Rham-Hodge Laplacian as well as Ebin-Marsden’s Laplacian.A probabilistic representation formula for Navier-Stokes equations on a general compact Riemannian manifold is obtained when de Rham-Hodge Laplacian is involved.

关键词： Nash embedding shape operator vector valued Laplacians Navier-Stokes equations stochastic representation

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Transitive partially hyperbolic di eomorphisms with one-dimensional neutral center

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Science China Mathematics 2020年第9期63卷 1647-1670页

作者： Christian Bonatti Jinhua Zhang Institut de Mathematiques de bourgogne Universite de BourgogneDijon 21104France School of Mathematical Sciences Beihang UniversityBeijing 100191China

In this paper,we study transitive partially hyperbolic di eomorphisms with one-dimensional topologically neutral center,meaning that the length of the iterate of small center segments remains *** systems are dynamically *** show that there exists a continuous metric along the center foliation which is invariant under the *** an application,we classify the transitive partially hyperbolic di eomorphisms on 3-manifolds with topologically neutral center.

关键词： partial hyperbolicity dynamical coherence conjugacy transitivity neutral

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原位表面改性的纳米WC/AlSi10Mg合金增强机制

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Transactions of Nonferrous Metals Society of China 2024年第1期34卷 50-64页

作者：易江龙廖汉林常成闫星辰刘敏周克崧广东工业大学材料与能源学院广州510006 广东省科学院新材料研究所现代材料表面工程技术国家工程实验室广东省现代表面工程技术重点实验室广州510651 ICB UMR 6303 CNRSUniv.Bourgogne Franche-ComtéUTBM90010BelfortFrance

采用静电自组装工艺合成-系列不同纳米WC含量的表面改性Al Si10Mg粉末,并使用激光选区熔化(SLM)技术制备纳米WC/AlSi10Mg复合材料。结果表明,SLM制备的纳米WC/AlSi10Mg材料中形成多种Al-W金属间化合物相,通过(002)(α(Al))//(104)Al_(5)... 详细信息

采用静电自组装工艺合成-系列不同纳米WC含量的表面改性Al Si10Mg粉末,并使用激光选区熔化(SLM)技术制备纳米WC/AlSi10Mg复合材料。结果表明,SLM制备的纳米WC/AlSi10Mg材料中形成多种Al-W金属间化合物相,通过(002)(α(Al))//(104)Al_(5)W的取向关系,证实具有4.7%的低晶格失配度的Al/Al5W可形成良好共格界面。纳米WC颗粒和Al-W相可促使柱状晶转变为等轴晶,获得精细的等轴晶组织。同时,SLM制备的3%(质量分数)纳米WC/Al Si10Mg复合材料具有最优的力学性能,抗拉强度为(464.1±8.68) MPa,伸长率为(5.6±0.95)%。此外,与其他WC/AlSi10Mg复合材料相比,SLM制备的3%WC/AlSi10Mg样品的平均摩擦因数和磨损率最低,分别为0.429和3.842×10^(-5)mm^(3)/(N·m)。力学和磨损性能的提升主要归因于晶粒细化和第二相析出强化作用。

关键词：原位改性激光选区熔化纳米WC AlSi10Mg 力学性能

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Chaos in DNA evolution

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International Journal of Biomathematics 2016年第5期9卷 199-215页

作者： Jacques M. Bahi Christophe Guyeux Antoine Perasso Institut FEMTO-ST Universitg Bourgogne Franche-Comtd 25000 Besancon France UMR Chrono-Environnement Universite Bourgogne Franche-Comte 25000 Besancon France

In this paper, we explain why the chaotic mutation （CM） model of J. M. Bahi and C. Michel （2008） simulates the genes mutations over time with good accuracy. It is firstly shown that the CM model is a truly chaotic one, as it is defined by Devaney. Then, it is established that mutations occurring in genes mutations have indeed a same chaotic dynamic, thus making relevant the use of chaotic models for genomes evolution. Transposition and inversion dynamics are finally investigated.

关键词： Genomes evolution models mutations inversions transpositions mathema- tical topology Devaney's chaos.

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THERMODYNAMIQUE　DES　ENSEMBLES　DE　CANTOR　AUTOSIMILAIRES　（THERMODYNAMICS　OF　SELF－SIMILAR　CANTOR　SETS）

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Chinese Annals of Mathematics,Series B 1994年第3期15卷 253-272页

作者： G. MICHON J. PEYRIERE(University de bourgogne, URA 755, BP 138, 21004 Dijon, dance.)(University de Paris-Sud, Centre d’Orsayl URA 757, 91405 Orsayt dance.) Universite de bourgogne 法国 Universite de Paris-Sud 法国

A class of metric, compact, and totally disconllected spaces, called self-similar Cantor setsis illtroduced. A self-similar structure is defined to be a graph with weighted edges. Theintroduction of ultrametrics and quasi-isometries gives versatility to this construction. Thermodynamical functions as free energy and elltropy are associated with self-similar *** analysis, based on a 'Large Deviations' inequality and Gibbs measures, leads toa fairly general Hausdoffi dimension theorem.

关键词： Cantor set Graph Dimension Thermodynamics Gibbs meajsure,Multifractals.

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The Fifth Order Peregrine Breather and Its Eight-Parameter Deformations Solutions of the NLS Equation

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Communications in Theoretical Physics 2014年第3期61卷 365-369页

作者： Pierre Gaillard Unversitéde bourgogne Campus de Mirande 9 Avenue Alain Savary

We construct here explicitly new deformations of the Peregrine breather of order 5 with 8 real *** gives new families of quasi-rational solutions of the NLS equation and thus one can describe in a more precise way the phenomena of appearance of multi rogue waves. With this method, we construct new patterns of different types of rogue waves. We get at the same time, the triangular configurations as well as rings isolated. Moreover, one sees appearing for certain values of the parameters, new configurations of concentric rings.

关键词： NLS equation Peregrine breathers Akhmediev's solutions

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