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Colorimetric and electrochemical Pb^(2+) detection by imine-bridged tetrathiafulvalene-pyridine derivatives

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science China Chemistry 2009年第6期52卷 765-770页

作者： tung ChenHo Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and Chemistry & Graduate University Chinese Academy of Sciences

Imine-bridged TTF-π-pyridine derivatives, 2NTTF, 3NTTF and 4NTTF, were synthesized and the cation-binding study was performed. It is noted that with the addition of the micromolar concentration of Pb2+ to the solution, these compounds display remarkable changes in solution color, 1H NMR spectra and electrochemical properties. The nitrogen atom of the imine-bridge in 2NTTF not only serves as a π-conjugated spacer but also participates in the sensing and coordinating properties.

关键词： tetrathiafulvalene intramolecular charge transfer imine-bridged TTF-π-pyridine derivatives Pb2+ recognition

Canonical metrics on complex manifold

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science China Mathematics 2008年第4期51卷 503-508页

作者： YAU shing-tung(Yau s.-T.) Department of Mathematics Harvard University

Complex manifolds are topological spaces that are covered by coordinate charts where the coordinate changes are given by holomorphic *** example,Riemann surfaces are one dimensional complex *** order to understand complex manifolds,it is useful to introduce metrics that are compatible with the complex *** general,we should have a pair(M,ds^2_M)where ds^2_M is the *** metric is said to be canonical if any biholomorphisms of the complex manifolds are automatically *** metrics can naturally be used to describe invariants of the complex structures of the manifold.

关键词：云门

A comprehensive consideration of bias voltage and temperature to extract the intrinsic frequency response of photodiodes

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Chinese science Bulletin 2010年第32期55卷 3727-3733页

作者： tung ChenHo Chinese Academy of sciences Technical Institute of Physics and Chemistry Chinese Academy of Sciences

Frequency response is one of the most important characteristics of photodiode (PD). The upper limitation of the bandwidth of a PD is determined by its intrinsic frequency response. Based on the extraction method to extract the intrinsic frequency response,we take a further study to analyze the impact of the reverse bias voltage and the temperature on the frequency response of PDs. With the help of physical model,the experimental data and fitted results based on the reverse bias voltage and temperature separately are discussed,then the most reliable intrinsic frequency response of a PD is obtained.

关键词：固有频率响应光电二极管偏置电压提取方法温度国家环保总局物理模型实验数据

supramolecular assemblies based on 2-ureido-4[1H]-pyrimidinone building block

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Chinese science Bulletin 2006年第2期51卷 129-138页

作者： tung Chenho Technical Institute of Physics and Chemistry Chinese Academy of SciencesBeijing 100101 China

With high association constants in nonpolar solvents, the quadruple hydrogen bonding arrays of 2-ureido-4[1H]-pyrimidinones are recently considered to be one of the ideal building blocks to construct the complicated and functional supramole- cular systems. In this paper, we review the latest achievements of the supramolecular assemblies based on 2-ureido-4[1H]-pyrimidinone AADD quad- ruple hydrogen bonding building blocks.

关键词： 2-脲基-4[1H]-嘧啶酮超分子自组装氢键结合

AI,the internet of legal things,and lawyers

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Journal of Management Analytics 2019年第4期6卷 390-403页

作者： Kenneth tung In-Gear Legalytics Limited Hong KongChina

A great deal of has been written about the challenges of a legal profession that resists change and sub-optimizes clients’benefits,and even more ink has been spilled on the opportunities and threats of *** laws are falling further behind an accelerating,dynamic world,the gap between businesses and opaque legal functions widens with the latter being perceived often as fire-fighting cost *** article calls out the opportunity of AI,specifically machine learning,and its impact on decision making as an opportunity for business leaders to elevate lawyers to contribute further to corporate strategies and *** the implications of machine learning through the lens of each element of decision making,the article aims to bring the relevance of today’s ubiquitous transformations to the legal *** also reminds business leaders that the legal function will need some help,such as corporate legal strategists,to drive and sustain change that resides in the intersection of law,business and technology.

关键词： artificial intelligence machine learning corporate legal strategy change management strategic business functions

Predicted aerodynamic damping of slender single beam structures in across-wind vibrations

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Acta Mechanica sinica 2020年第5期36卷 990-998,I0001页

作者： Cung Huy Nguyen Dinh tung Nguyen Department of Civil Engineering Industrial University of Ho Chi Minh CityHo Chi Minh City 700000Vietnam Department of Civil Engineering University of NottinghamNottingham NG72RDUK

The paper presents a generalization of the conventional analytical approach where the quasisteady theory is utilised to evalu-ate the across-wind aerodynamic damping of slender single beam *** generalized theory considers the variation of structural and aerodynamic parameters along the structural height,together with the nature of the vertical wind profile and mode ***-form solutions for typical uniform and tapered tall buildings are given.A numerical application on a prototype tall building shows that the conventional method may be oversimplified,which results in incorrect predictions of the aerodynamic damping.

关键词： Aerodynamic damping Across-wind slender structure-Galloping Tall building

Pulse gas alignment and AFM manipulation of single-wall carbon nanotube

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Chinese science Bulletin 2008年第22期53卷 3590-3596页

作者： tung steve state Key Laboratory.of Robotics Shenyang Institute of Automation Chinese Academy of Sciences

In the fabrication process of nanoelectronic device arrays based on single-wall carbon nanotube (sWCNT), oriented alignment of sWCNTs and property modification of metallic sWCNTs in the array are the key problems to be solved. Pulse gas alignment with substrate downward tilt is proposed to realize the controllable alignment of sWCNTs. Experimental results demonstrate that 84% sWCNTs are aligned in -15°―15° angular to the pulse gas direction. A modified nanomanipulation technology based on atomic force microscope (AFM) is utilized to perform various kinds of sWCNT manipulation, such as sWCNT separation from the "Y" CNT, catalyst removal from the sWCNT end, continual nano buckles fabrication on sWCNT and even stretching to break, which provides a feasible way to modify the size, shape and the electrical property of sWCNTs.

关键词： sWCNT 碳纳米管显微镜 AFM

Photooxidation of Hantzsch 1,4-dihydropyridines by molecular oxygen

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Chinese science Bulletin 2010年第25期55卷 2855-2858页

作者： tung ChenHo Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and ChemistryChinese Academy of Sciences

Photooxidation of Hantzsch 1,4-dihydropyridines (1,4-DHP,1a-1d) by direct irradiation (λ > 300 nm) under an oxygen atmosphere has been carefully examined in this work. spectroscopic and electrochemical studies demonstrate that photoinduced singlet electron transfer from 1,4-DHP to molecular oxygen occurs. The generated superoxide radical anion (O2-·) is responsible for this typical photochemical oxidation.

关键词：光氧化反应二氢分子氧超氧自由基光化学氧化氧气气氛化学研究电子转移

Metrics on complex manifolds

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science China Mathematics 2010年第3期53卷 565-572页

作者： YAU shing-tung Department of Mathematics Harvard University Cambridge

In this note we discuss various canonical metrics on complex manifolds. A generalization of the Bergman metric is proposed and the relations of metrics on moduli spaces are commented. At last, we review some existence... 详细信息

关键词： intrinsic metrics generalized Bergman metrics Weil-Petersson metric strominger system