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Investigating Why Sulfurization Can Greatly Improve Ethanol Selectivity for Carbon Dioxide Electroreduction

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CCS Chemistry 2022年第10期4卷 3319-3328页

作者： Qian-Yu Wang Yu-Hang Li Yu Zhao Yu-Yu Chen bi-jun geng Rong-Kai Ye Qiong Liu Xiao-Qing Liu Ye-Xiang Tong Yue-Jiao Zhang jun Cheng Ping-Ping Fang Jian-Qiang Hu Jian-Feng Li Zhong-Qun Tian MOE of the Key Laboratory of bioinorganic and Synthetic Chemistry The Key Laboratory of Low-Carbon Chem&Energy Conservation of Guangdong ProvinceSchool of ChemistrySun Yat-Sen UniversityGuangzhou 510275 Department Key Laboratory of Fuel Cell Technology of Guangdong Province Nanobiological Medicine CenterSchool of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510640 State Key Laboratory of Physical Chemistry of Solid Surfaces iChEMCollege of Chemistry and Chemical EngineeringCollege of EnergyXiamen UniversityXiamen 361005

Carbon dioxide(CO_(2))electroreduction of products using renewable electricity sources is a promising avenue for chemical energy storage that is attracting increasing *** effort has been focused on improving the activity and selectivity for CO_(2)electroreduction of C2+products,especially for ***,studies of this process’s underlying mechanism are still lacking.

关键词： surface-enhanced Raman spectroscopy CO_(2)electroreduction electrocatalysis operando spectroscopy mechanisms

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光镊捕获和操控尺度极限的进展

物理化学学报 2024年第1期40卷 3-19页

作者：霍春安邱圣杰梁青满耿碧君雷志超王干邹玉玲田中群杨扬厦门大学萨本栋微米纳米科学技术研究院固体表面物理化学国家重点实验室福建厦门361005

光镊技术能够实现对介观乃至微观颗粒的稳定捕获和灵活操控,是对微纳物体和单个分子施加力并观测其响应的理想操控手段。受限于光的衍射极限,传统光镊难以实现对100 nm以下物体的捕获和操控。研究者们通过开发特殊的材料和结构,将它们... 详细信息

光镊技术能够实现对介观乃至微观颗粒的稳定捕获和灵活操控,是对微纳物体和单个分子施加力并观测其响应的理想操控手段。受限于光的衍射极限,传统光镊难以实现对100 nm以下物体的捕获和操控。研究者们通过开发特殊的材料和结构,将它们与传统光镊技术结合,不断突破其在小尺度物体的捕获和操控极限。本文主要综述了近年来光镊的不同技术路线在突破捕获操控极限的研究进展,以及其在物理化学领域中的应用,并对其发展和应用进行展望。

关键词：光镊单分子捕获尺寸微尺度操控等离激元固液界面

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Homogenization of Elliptic Problems with Neumann Boundary Conditions in Non-smooth Domains

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Acta Mathematica Sinica,English Series 2018年第4期34卷 612-628页

作者： jun geng School of Mathematics and Statistics Lanzhou University

We consider a family of second-order elliptic operators {LE } in divergence form with rapidly oscillating and periodic coefficients in Lipschitz and convex domains in Rn. We are able to show that the uniform WI＇p estimate of second order elliptic systems holds for 2n/n＋1-δ〈p〈2n/n-1＋δ where δ 〉 0 is independent of ~ and the ranges are sharp for n = 2, 3. And for elliptic equations in Lipschitz domains,the W1,p estimate is true for 3/2 -δ 〈 p〈 3 ＋ δ ifn ≥ 4, similar estimate was extended to domains, the WI＇p estimate is true for nconvex domains for 1 〈 p 〈 ∞.

关键词： Homogenization elliptic non-smooth

定向电场下W_(6)C_(6)团簇的超卤素调制及非线性光学特性

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原子与分子物理学报 2025年第3期42卷 72-76页

作者：蔡璧钧段宇静魏强重庆理工大学理学院重庆400050

本文采用密度泛函(DFT)方法研究了定向外电场(OEEF)对W_(6)C_(6)团簇几何结构、电子性质以及非线性光学响应(NLO)的影响.计算结果表明W_(6)C_(6)的结构在一定OEEF强度下可以保持稳定.OEEF可以增大W_(6)C_(6)团簇的电子亲和能(EA值),且... 详细信息

本文采用密度泛函(DFT)方法研究了定向外电场(OEEF)对W_(6)C_(6)团簇几何结构、电子性质以及非线性光学响应(NLO)的影响.计算结果表明W_(6)C_(6)的结构在一定OEEF强度下可以保持稳定.OEEF可以增大W_(6)C_(6)团簇的电子亲和能(EA值),且在特定强度下,OEEF可以将W_(6)C_(6)团簇转变为超卤素.通过对EA值的非线性拟合可以实现对W_(6)C_(6)团簇的连续调制.进一步对不同外电场下W_(6)C_(6)团簇的最高占据分子轨道(HOMO)和最低未占据分子轨道(LUMO)能级进行分析,发现OEEF降低了W_(6)C_(6)团簇LUMO能级是其EA值增大的主因.此外,OEEF可以显著增大W_(6)C_(6)团簇的平均极化率和第一超极化率,尤其是第一超极化率,改变其非线性光学性质.

关键词：定向外电场超原子密度泛函理论 NLO W_(6)C_(6)团簇

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IS: Interest Set to Enhance Flow Transmission in Named-Data Networking

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China Communications 2016年第S1期13卷 65-71页

作者： JIANG Xiaoke bi jun Institute for Network Sciences and Cyberspace Tsinghua University Department of Computer Science and Technology Tsinghua University Tsinghua National Laboratory for Information Science and Technology

Named-data Networking(NDN) is a promising future Internet architecture, which introduces some evolutionary elements into layer-3, e.g., consumer-driven communication, soft state on data forwarding plane and hop-byhop traffic control. And those elements ensure data holders to solely return the requested data within the lifetime of the request, instead of pushing data whenever needed and whatever it is. Despite the dispute on the advantages and their prices, this pattern requires data consumers to keep sending requests at the right moments for continuous data transmission, resulting in significant forwarding cost and sophisticated application design. In this paper, we propose Interest Set(IS) mechanism, which compresses a set of similar Interests into one request, and maintains a relative long-term data returning path with soft state and continuous feedback from upstream. In this way, IS relaxes the above requirement, and scales NDN data forwarding by reducing forwarded requests and soft states that are needed to retrieve a given set of data.

关键词： index terms—named-data networking flow transmission

FINE:Future Internet iNnovation Environment

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China Communications 2015年第1期12卷 146-147页

作者： bi jun Institute for Network Sciences and Cyberspace Tsinghua University Department of Computer Science Tsinghua University Tsinghua National Laboratory for Information Science and Technology(TNList)

This article introduces FINE(Future Internet iNnovation Environment) project,which is supported by National High-tech R&D Program( "863" Program) of China.

关键词：互联网环境创新

A tool for tracing network data plane via SDN/OpenFlow

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Science China(Information Sciences) 2017年第2期60卷 74-86页

作者： Yangyang WANG jun bi Keyao ZHANG Institute for Network Sciences and Cyberspace Tsinghua University Tsinghua National Laboratory for Information Science and Technology (TNList) Department of Computer Science Tsinghua University

SDN provides an approach to create desired network forwarding plane by programming *** a large-scale SDN network comprised of multiple domains and running multiple controller applications, it is difficult to measure and diagnose the problems of flow tables in data plane. Tracing the forwarding path of SDN is one of effective way for data plane state measurement. Previously proposed methods for debugging SDN were applied to a single administrative domain. There is less effort to trace the flow entries of the data plane in large-scale multi-domain SDN networks. In this paper, we propose a method of software defined data plane tracing in large-scale multi-domain SDN networks. Our method can trace forwarding paths, and get the matched flow entries and other customized trace information. We present the designs compatible with Open Flow 1.0 and1.3 switches. The performance and deployment effect are evaluated by simulation test and analysis. It shows that our method has better performance than traditional IP traceroute, and its deployment at about 20% of AS nodes can enable 70% of AS paths to be traceable.

关键词： software defined networking data plane network measurement traceroute Internet routing

Human-machine interaction force control: using a model-referenced adaptive impedance device to control an index finger exoskeleton

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Journal of Zhejiang University-Science C(Computers and Electronics) 2014年第4期15卷 275-283页

作者： Qian bi Can-jun YANG State Key Laboratory of Fluid Power Transmission and Control Zhejiang University

Exoskeleton robots and their control methods have been extensively developed to aid post-stroke rehabilitation. Most of the existing methods using linear controllers are designed for position control and are not suitable for human-machine interaction(HMI) force control, as the interaction system between the human body and exoskeleton is uncertain and nonlinear. We present an approach for HMI force control via model reference adaptive impedance control(MRAIC) to solve this problem in case of index finger exoskeleton control. First, a dynamic HMI model, which is based on a position control inner loop, is formulated. Second, the theoretical MRAC framework is implemented in the control system. Then, the adaptive controllers are designed according to the Lyapunov stability theory. To verify the performance of the proposed method, we compare it with a proportional-integral-derivative(PID) method in the time domain with real experiments and in the frequency domain with simulations. The results illustrate the effectiveness and robustness of the proposed method in solving the nonlinear HMI force control problem in hand exoskeleton.

关键词： Interaction force Adaptive control Exoskeleton Human-machine interaction(HMI) Impedance

Numerical Investigations on Harbor Oscillations Induced by Falling Objects

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China Ocean Engineering 2023年第3期37卷 458-470页

作者： GAO jun-liang bi Wen-jing ZHANG Jian ZANG jun School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China Key Laboratory of Port Waterway and Sedimentation Engineering of MOTNanjing Hydraulic Research InstituteNanjing 210029China Key Laboratory of Water Security Guarantee in Guangdong-Hong Kong-Marco Greater Bay Area of Ministry of Water Resources Guangzhou 510611China Centre for Infrastructure Geotechnical and Water Engineering(IGWE)Department of Architecture and Civil EngineeringUniversity of BathBA27AYUK

In this paper,the open-sourced computational fluid dynamics software,OpenFOAM~?,is used to study the fluctuation phenomenon of the water body inside a horizontally one-dimensional enclosed harbor basin with constant water depth triggered by falling wedges with various horizontal falling positions,initial falling velocities and *** on both Fourier transfo rm analysis and wavelet spectrum analysis for the time series of the free surface elevations inside the harbor basin,it is found for the first time that the wedge falling inside the harbor can directly trigger harbor *** influences of the three factors(including the horizontal falling position,the initial falling velocity,and the mass)on the response amplitudes of the lowest three resonant modes are also *** results show that when the wedge falls on one of the nodal points of a resonant mode,the mode would be remarkably ***,when the wedge falls on one of the anti-nodal points of a resonant mode,the mode would be evidently *** initial falling velocity of the wedge mainly has a remarkable effect on the response amplitude of the most significant mode,and the latter shows a gradual increase trend with the increase of the *** for the other two less significant modes,their response amplitudes fluctuate around certain constant values as the initial falling velocity *** general,the response amplitudes of all the lowest three modes are shown to gradually increase with the mass of the wedge.

关键词： harbor oscillations seiches falling objects resonant mode response amplitude