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Flexible Vertex Engineers the Controlled Assembly of Distorted Supramolecular Tetrahedral and Octahedral Cages

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Research 2022年第2期2022卷 333-344页

作者： Shu-Jin Bao Ze-Ming Xu Tian-Chen Yu Ying-Lin Song Heng Wang Zheng Niu Xiaopeng Li Brendan F.Abrahams Pierre Braunstein Jian-Ping Lang Collge of Chemistry Chemical Enginering and Materias ScienceSoochow UniversitySuzhou 215123China State Key Laboratory of rgnomallic Chemistry Shanghai Jnstitute of Organic ChemistryChinese Academy of SciencesShanghai 200032China School of Plysical science and Techmology Soochow UinversitySuzhou 215006China College of Chemistry and Enwironmenrial Engineering Shenzhen UniversilyShenzhen 518071China School of Chemistry University of MelbourneVictoria 3010Australia Universite de Strasbourg-cnrs Institut de Chimie(UMR 7177 CNRS)4 Rue Blaise Pascal CS 9003267081 StrasbourgFrance

Designing and building unique cage asemblies atrat increasing interet from supramolecular chemists but remain synthetically ***,we propose the use of a flexible vertex with adjustable angles to selectively form highly distorted tetrahedral and octahedral cages,for the first time,in which the flexible ve rtex forms from the synergistic eft of coordination and covalent *** inherent interligand angle of the vertex can be modulated by guest anions present,which allows for the fine-tuning of diferent cage ***,the reversible structural transformation between tetrahedral and octahedral cages was achieved by anion exchange monitored by mass spectrometric technique,the smaller anions favoring tetrahedral cages,while the larger anions supporting octahedral ***,the KBr-based cage thin films exhibited prominent enhancement of their third-order NLO responses in two or three orders of magnitude compared to those obtained for their corresponding *** work not only provides a new methodology to build irregular polyhedral structures in a controlled and tunable way but also provides access to new kinds of promising functional optical materials.

关键词： vertex tetrahedral synergistic

Observation of free oscillations after the 2010 Chile and 2011 Japan earthquakes by superconducting gravimeter in Kutch,Gujarat,India

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Geodesy and Geodynamics 2023年第1期14卷 52-64页

作者： Chandra Sekhar Pedapudi Madhusudhana Rao Katlamudi Severine Rosat institute of Seismological Research GandhinagarGujaratIndia Department of Earth sciences Gujarat UniversityAhmedabadGujaratIndia Institut Terre et Environnement de Strasbourg CNRS UMR 7063StrasbourgFrance

In this paper,we present observations of free oscillations of the Earth after major earthquakes in Chile(February 27,2010,Mw8.8)and Japan(March 11,2011,Mw9.1)using data from the dual-sphere superconducting gravimeter(SG-055),installed at Badargadh(23°0.47 N,70°0.62 E),Kutch,Gujarat,India in March *** see the noise characteristics,we calculated the power spectral density of the gravity time series of 5 quiet days in the frequency band 0.05-20 mHz using the new low noise model(NLNM)as a *** compared the noise level of the Badargadh site to other SG sites around the *** shows that the Badargadh SG is in a low noise *** find that the noise increases at frequencies below 1 *** a characteristic is also observed in Djougou(Afrique,Benin)and Strasbourg(France).Using theoretical tides for Gujarat,we estimated a scale factor of about-814 nm/s~2/V for Gravl(lowersphere)and about-775 nm/s~2/V for Grav2(upper-sphere).We corrected the influence of atmospheric pressure from the one-second gravity data before switching to the frequency *** extracted a total of 53 Earth’s Free Oscillations(EFO)modes during the earthquake in Japan and about 47 EFO modes during the earthquake in *** are able to extract the lowest0S2spheroidal mode(0.30945 mHz or54 min)and0S0radial mode(0.81439 mHz or 20 min).The longer time series shows individual0S2singlets and0S3(0.46855 mHz)singlets due to the Coriolis splitting *** cross-referenced the frequencies of these modes using the PREM model and previous global *** correlation coefficient between the observed and the PREM model for these two events are 0.999 for Japan earthquake and 0.993 for Chile *** validates the quality of the data useful for low-frequency studies in *** also calculated the relative deviations of our observed fundamental modes with previously determined observed and theoretical *** found that the relative deviations of our observed free oscillations

关键词： Superconducting gravity data Free oscillations PREM model

Tectonic evolution of the Dabieshan orogen: In the view from polyphase deformation of the Beihuaiyang metamorphic zone

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science China Earth sciences 2005年第7期48卷 886-899页

作者： LIN Wei1, 2, Faure Michel3, WANG Qingchen1 & Arnaud Nicolas4 1. LTE, institute of Geology and Geophysics, Chinese Academy of sciences, Beijing 100029, China 2. Department of Earth and Planetary sciences, Graduate School of science, Nagoya University, Japan 3. ISTO, umr cnrs 6113, Batiment Géosciences, Orléans Université d’Orléans, 45067 Orléans Cedex 2, France 4. umr 6524 "Magmas et Volcans", 5 Rue Kessler, 63000 Clermont-Ferrand, France LTE Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China Department of Earth and Planetary sciences Graduate School of Science Nagoya University Japan ISTO UMR CNRS 6113 Orléans Université d'Orléans 45067 Orléans Cedex 2 France umr 6524 Magmas et Volcans 63000 Clermont-Ferrand 5 Rue Kessler France

The Beihuaiyang metamorphic zone was formed by the Early Mesozoic collision of the North and South China Blocks. It consisted of the Foziling and Luzhenguan complexes and was thought to have never afforded a deep subduction. A similar feature of the deformation in the Dabieshan UHP metamorphic rocks implies that these different tectonic units share the same geodynamic background. The early stage of deformation can be preserved on account of their relatively shallower subduction than that for UHP rocks. On the basis of an analysis of the geo- logical structure and geochronological results, five deformational stages have been recognized: a D1-Early compressional deformation which represents the continental subduction; a D2-Early exhumation deformation producing a syn-convergence exhumation; a D3-Main deformation, represented by an exhumation deformation with Late Triassic age; a D4-Doming and its margin extensional gravity collapse deformation and finally a D5-regional extensional deformation of Cretaceous that was mostly introduced by the migmatization and plutonism.

关键词： Beihuaiyang metamorphic zone geometry kinematic polyphase deformation tectonic evolution.

Using orbital sensitivity analysis to pinpoint the role of orbital interactions in thermoelectric power factor

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npj Computational Materials 2023年第1期9卷 937-945页

作者： Wenhao Zhang Jean-François Halet Takao Mori WPI Center for Materials Nanoarchitectonics(MANA) National Institute for Materials ScienceTsukubaJapan Graduate School of Pure and Applied sciences University of TsukubaTsukubaJapan cnrs-Saint-Gobain-NIMS Laboratory for Innovative Key Materials and Structures(LINK)National Institute for Materials ScienceTsukubaJapan

The modification of the electronic band structure is of critical importance for thermoelectric materials whose heat to electricity power generation is related to carrier effective mass and alignment of semiconductor band *** approach to optimize the electronic band structure is by modification of orbital interactions through doping or *** the current ab-initio quantum chemical calculations can help us to investigate orbital components of electronic bands,they reveal little information on the relative tunability of electronic states and transport properties with respect to orbital *** this work,we present a method,based on a symmetry-adapted tight-binding model and sensitivity analysis,that can pinpoint the role of orbital interactions in determining electronic band structure and transport *** an application,a systematic theoretical analysis is used to show how the power factor of PbTe can/cannot be improved by playing with interatomic orbital *** orbital interaction sensitivity analysis introduced in this work can easily be applied to other compounds or properties.

关键词： properties orbital symmetry

Uniqueness of Fokker-Planck equations for spin lattice systems(Ⅱ): Non-compact case

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science China Mathematics 2014年第1期57卷 161-172页

作者： LEMLE Ludovic Dan WANG Ran WU LiMing Engineering Faculty of Hunedoara Politehnica University of TimisoaraHunedoara 331128Romania School of Mathematical sciences University of Science and Technology of China institute of Applied Mathematics Academy of Mathematics and Systems ScienceChinese Academy of Sciences Laboratoire de Math. cnrs-umr 6620 Universit Blaise PascalAubière 63177France

We study the existence and uniqueness of solutions for a class of infinite-dimensional Fokker-Planck equations on the spin lattice systems M Z d,where the spin space M is a non-compact Riemannian *** method is based on the Stroock-Varadhan’s martingale approach,some compactness results of the general theory developed by Ethier-Kurtz,and some a priori gradient estimates.

关键词： spin lattice systems,Fokker-Planck equation

Electrospun poly（vinylidene fluoride-trifluoroethylene）/ zinc oxide nanocomposite tissue engineering scaffolds with enhanced cell adhesion and blood vessel formation

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Nano Research 2017年第10期10卷 3358-3376页

作者： Robin Augustine Pan Dan Alejandro Sosnik Nandakumar Kalarikkal Nguyen Tran Brice Vincent Sabu Thomas Patrick Menu Didier Rouxel Laboratory of Pharmaceutical Nanomaterials science Department of Materials Science and Engineering Technion-lsrael Institute of Technology De-Jur Building Technion City Haifa 3200003 Israel Intemationaland Inter University Centre for Nanoscience and Nanotechnology Mahatma Gandhi University Kottayam Kerala 686560 India Ingenierie Moleculaire et Physiopathologie Articulaire UMR 7365 CNRS-Universite de Lorraine Vandoeuvre-Ies Nancy F-54500 France School of Pure and Applied Physics Mahatma Gandhi University Kottayam Kerala 686560 India School of Surgery Faculty of Medicine Universite de Lorraine Vandoeuvre-Ies-Nancy F-54500 France Institut Jean Lamour UMR 7198 CNRS-Universite de Lorraine Vandoeuvre-Ies-Nancy F-54500 France School of chemical sciences Mahatma Gandhi University Kottayam Kerala 686560 India

Piezoelectric materials that generate electrical signals in response to mechanical strain can be used in tissue engineering to stimulate cell proliferation. Poly （vinylidene fluoride-trifluoroethylene）（P（VDF-TrFE））, a piezoelectric polymer, is widely used in biomaterial applications. We hypothesized that incorporation of zinc oxide （ZnO） nanoparticles into the P（VDF-TrFE） matrix could promote adhesion, migration, and proliferation of cells, as well as blood vessel formation （angiogenesis）. In this study, we fabricated and comprehensively characterized a novel electrospun P（VDF-TrFE）/ZnO nanocomposite tissue engineering scaffold. We analyzed the morphological features of the polymeric matrix by scanning electron microscopy, and utilized Fourier transform infrared spectroscopy, X-ray diffraction, and differential scanning calorimetry to examine changes in the crystalline phases of the copolymer due to addition of the nanoparticles. We detected no or minimal adverse effects of the biomaterials with regard to blood compatibility in vitro, biocompatibility, and cytotoxicity, indicating that P（VDF-TrFE）/ZnO nanocomposite scaffolds are suitable for tissue engineering applications. Interestingly, human mesenchymal stem cells （hMSCs） and human umbilical vein endothelial cells cultured on the nanocomposite scaffolds exhibited higher cell viability, adhesion, and proliferation compared to cells cultured on tissue culture plates or neat P（VDF-TrFE） scaffolds. Nanocomposite scaffolds implanted into rats with or without hMSCs did not elicit immunological responses, as assessed by macroscopic analysis and histology. Importantly, nanocomposite scaffolds promoted angiogenesis, which was increased in scaffolds pre-seeded with hMSCs. Overall, our results highlight the potential of these novel P（VDF-TrFE）/ZnO nanocomposites for use in tissue engineering, due to their biocompatibility and ability to promote cell adhesion and angiogenesis.

关键词： scaffolds electrospinning poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) ZnO angiogenesis cell adhesion stem cells

Three-Dimensional Linear Instability Analysis of Thermocapillary Return Flow on a Porous Plane

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Chinese Physics Letters 2010年第2期27卷 165-168页

作者：赵思诚刘秋生 NGUYEN-THI Henri BILLIA Bernard Key Laboratory of Microgravity Institute of Mechanics Chinese Academy of Sciences Beijing 100190 IM2NP UMR CNRS 6137 Université d'Aix-Marseille III 13397 Marseille Cedex 20 France

A three-dimensional linear instability analysis of thermocapillary convection in a fluid-porous double layer system, imposed by a horizontal temperature gradient, is performed. The basic motion of fluid is the surface-tension-driven return flow, and the movement of fluid in the porous layer is governed by Darcy＇s law. The slippery effect of velocity at the fluid-porous interface has been taken into account, and the influence of this velocity slippage on the instability characteristic of the system is emphasized. The new behavior of the thermocapillary convection instability has been found and discussed through the figures of the spectrum.

关键词： Fluid dynamics

Gravity-Driven Instability in a Liquid Film Overlying an Inhomogeneous Porous Layer

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Chinese Physics Letters 2011年第2期28卷 144-147页

作者： ZHAO Si-Cheng LIU Qiu-Sheng NGUYEN-THI Henri BILLIA Bernard Key Laboratory of Microgravity Institute of MechanicsChinese Academy of SciencesBeijing 100190 IM2NP UMR CNRS 6137Universitéd’Aix-Marseille III13397 Marseille Cedex 20France

A new model consisting of a liquid film overlying a saturated and inhomogeneous porous layer is *** concentrate on effects of inhomogeneity on transition of instability *** of the averaged porosity and the gradient of porosity distribution on the instability behaviors of a liquid-porous layer system are *** average permeability of the porous layer is a key factor to determine the penetration of convection in the system.

关键词： porosity porous layer

Unexpected current-voltage characteristics of mechanically modulated atomic contacts with the presence of molecular junctions in an electrochemically assisted-MCBJ

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Nano Research 2016年第2期9卷 560-570页

作者： Yang Yang Junyang Liu Shi Feng Huimin Wen Jinghua Tian Jueting Zheng Bernd Schollhorn Christian Amatore Zhongning Chen Zhongqun Tian Department of Chemistry/Pen-Tung Sah institute of Micro-Nano science and Technology State Key Laboratory of Physical Chemistry of Solid Surfaces and LIA CNRS NanoBioCatEchem Collaborative Innovation Center of Chemistry for Energy Materials Xiamen University Xiamen 361005 China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of SciencesFuzhou 350002 China cnrs umr 8640 PASTEUR and LIA cnrs NanoBioCatEchem Ecole Normale Superieure-PSL Research University Departement de Chimie Sorbonne Universit~s - UPMC Paris 6 24 rue Lhomond 75005 Paris France

In this article, we report on the characterization of various molecular junctions＇ current-voltage characteristics （Ⅰ-Ⅴ curves） evolution under mechanical modulations, by employing a novel electrochemically assisted-mechanically controllable break junction （EC-MCBJ） method. For 1,4-benzenedithiol, the Ⅰ-Ⅴ curves measured at constant electrode pair separation show excellent reproducibility, indicating the feasibility of our EC-MCBJ method for fabricating molecular junctions. For ferrocene-bisvinylphenylmethyl dithiol （Fc-VPM）, an anomalous type of Ⅰ-Ⅴ curve was observed by the particular control over the stepping motor. This phenomenon is rationalized assuming a model of atomic contact evolution with the presence of molecular junctions. To test this hypothesized model, a molecule with a longer length, 1,3-butadiyne-linked dinuclear ruthenium（H） complex （Ru-1）, was implemented, and the Ⅰ-Ⅴ curve evolution was investigated under similar circumstances. Compared with Fc-VPM, the observed Ⅰ-Ⅴ curves show close analogy and minor differences, and both of them fit the hypothesized model well.

关键词： molecular junction electrochemical deposition mechanically controllable break junction (MCBJ) ruthenium complex ferrocenyl molecular wire