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Single-molecule devices reveal step-by-step dynamics of hydrogen bonds

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Science China Chemistry 2018年第6期61卷 639-640页

作者： Lifa Ni dong xiang Takhee Lee Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology College of Electronic Information and Optical Engineering Nankai University Department of Physics and Astronomy Seoul National University

Intermolecular interactions,including hydrogen bonding,hydrophobic interactions,halogen bonding etc.,are ubiquitous in nature,which play key roles in the basic chemical,physical and biochemical process of *** them,hydrogen bonds are particularly attractive because they dominate many important structures and functions in nature from elegant base-pair interactions in DNAs to sophisticated protein folding and are regarded as an important element in the discovery of new *** better elucidate fundamental mechanisms,

关键词：氢结合单个分子动力学设备相互作用生物化学分子间 DNA

The In-cell iR Compensation Using a Four-electrode System

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Chinese Chemical Letters 2006年第5期17卷 703-706页

作者： xiang Qin LIN Liang dong FENG University of Science and Technology of China Hefei 230026

A novel idea of in-cell iR compensation was proposed by using a four-electrode electrochemical system, which was consisted of two working electrodes, one reference electrode （RE） and one auxiliary electrode （AE）. One of the two working electrodes was called the auxiliary working electrode （AWE）, which was directly connected to the ground. Another working electrode was used as a regular working electrode （WE） for electrochemical testing. The reference electrode was set in a frit close to the AWE for potential sampling. The other electrodes, WE, RE and AE, were connected to a conventional potentiostat of three-electrode system for electrochemical measurements. A linear narrow electrochemical cell was designed for setting AE at one end and AWE with RE at another end, and setting WE in between AE and AWE. In this way, a positive feedback potential was generated at the working electrode from the solution resistance and the current flow in the solution. An formal iR compensation over 100%, as high as 500%, had been achieved without potential oscillation. The electrochemical cell design, the principle of the in-cell iR compensation, and the preliminary voltammetric characterization by using the redox reaction of ferrocyanide anions were reported.

关键词： In-cell iR compensation four-electrode system cell design cyclic voltammetry.

Evolution of low-mass X-ray binaries:dependence on the massof the compact object

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Research in Astronomy and Astrophysics 2012年第10期12卷 1417-1426页

作者： Qian Xu Tao Li xiang-dong Li Department of Astronomy Nanjing University Nanjing 210093 China Key Laboratory of Modern Astronomy and Astrophysics Ministry of Education NanjingUniversity Nanjing 210093 China

We perform numerical calculations to simulate the evolution of low-mass X-ray binary systems. For the accreting compact object we consider the initial mass of 1.4, 10, 20, 100, 200, 500 and 1000 Mo, corresponding to neutron stars （NSs）, stellar- mass black holes （BHs） and intermediate-mass BHs. Mass transfer in these binaries is driven by nuclear evolution of the donors and/or orbital angular momentum loss due to magnetic braking and gravitational wave radiation. For the different systems, we determine their bifurcation periods Pbif that separate the formation of converging systems from the diverging ones, and show that Pbif changes from ~ 1 d to ≥ 3 d for a 1 Mo donor star, with increasing initial accretor mass from 1.4 to 1000 Mo. This means that the dominant mechanism of orbital angular momentum loss changes from magnetic braking to gravitational radiation. As an illustration we compare the evolution of binaries consisting of a secondary star of 1 Mo at a fixed initial period of 2 d. In the case of the NS or stellar-mass BH accretor, the system evolves to a well-detached He white dwarf-neutron star/black hole pair, but it evolves to an ultra- compact binary if the compact object is an intermediate-mass BH. Thus the binary evolution heavily depends upon the mass of the compact object. However, we show that the final orbital period-white dwarf mass relation found for NS low-mass X-ray binaries is fairly insensitive to the initial mass of the accreting star, even if it is an intermediate-mass BH.

关键词： binaries: close -- stars: evolution -- stars: neutron -- X-ray: binaries

CONTINUATION METHOD APPLIED IN KINEMATICS OF PARALLEL ROBOT

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Applied Mathematics and Mechanics(English Edition) 2001年第12期22卷 1422-1428页

作者： dong Bin(董滨) zhaNG xiang-de(张祥德) Department of Mathematics Northeastern University Shenyang 110006 P R China Robot Open Laboratory of Science Institute of China Shenyang 110003 P R China

Continuation method solving forward kinematics problem of parallel robot was discussed. And through a coefficient-parameter continuation method the efficiency and feasibility of continuation method were improved. Using this method all forward solutions of a new parallel robot model which was put forward lately by Robot Open Laboratory of Science Institute of China were obtained. Therefore it provided the basis of mechanism analysis and real-time control for new model.

关键词： continuation method parallel robot kinematics generic continuation coefficient-parameter continuation

The connection between meridians and physiological functions:A quantum principle

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Nano Research 2023年第11期16卷 12817-12820页

作者： xiang-Yu Kong Min xiang Jiancheng Fang dong Han Bo Song Lei Jiang CAS Key Laboratory of Bio-inspired Materials and Interfacial Science Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Science and Technology Center for Quantum Biology National Institute of Extremely-Weak Magnetic Field InfrastructureHangzhou 310051China CAS Center for Excellence in Nanoscience National Center for Nanoscience and TechnologyBeijing 100190China School of Optical-Electrical Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China School of Future Technology University of Chinese Academy of SciencesBeijing 100049China

In the long history of traditional Chinese medicine(TCM),meridians play essential roles as the critical network to regulate the normal physiological functions of the human *** are regarded to be the channels connecting the internal organs with the body surface and various parts of the *** there are many studies and doctrines trying to reveal the nature of meridians for their validation in TCM,the mechanism underlying the meridians remains ***,based on our macroscopic quantum state concept of ion channels(i.e.,sub-nanometer scale channels),we propose a quantum principle of *** acupoints and organ symptom are in a macroscopic coherence state of the ion channels in *** applying TCM treatments(e.g.,TCM massage,acupuncture,moxibustion,and electroacupuncture)on the acupoint,the corresponding organ symptom could be well regulated with help of quantum meridian state.

关键词： traditional Chinese medicine meridians macroscopic quantum state external stimulation

The binding energy parameter for common envelope evolution

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Research in Astronomy and Astrophysics 2016年第8期16卷 71-78页

作者： Chen Wang Kun Jia xiang-dong Li Department of Astronomy Nanjing University Key Laboratory of Modern Astronomy and Astrophysics(Nanjing University) Ministry of Education

Abstract The binding energy parameter A plays a vital role in common envelope evolution. Though it is well known that A takes different values for stars with different masses and varies during stellar evolution, it has been erroneously adopted as a constant in most population synthesis calculations. We have system- atically calculated the values of A for stars of masses 1 - 60 M by use of an updated stellar evolution code, taking into account the contribution from both gravitational energy and internal energy to the binding energy of the envelope. We adopt the criterion for the core-envelope boundary advocated by Ivanova. A new kind of A with an enthalpy prescription is also investigated. We present fitting formulae for the calculated values of various kinds of A, which can be used in future population synthesis studies.

关键词： binaries: general -- stars: evolution -- stars: mass-loss

Individualized Pixel Synthesis and Characterization of Combinatorial Materials Chips

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Engineering 2015年第2期1卷 225-233页

作者： Xiao-dong xiang Gang Wang Xiaokun zhang Yong xiang Hong Wang State Key Laboratory of Green Building Materials China Building Materials Academy Intematix Corporation State Key Laboratory of Electronic Thin Films & Integrated Devices School of Energy Science and Engineering University of Electronic Science and Technology of China

Conventionally, an experimentally determined phase diagram requires studies of phase formation at a range of temperatures for each composition, which takes years of effort from multiple research groups. Combinatorial materials chip technology, featuring high-throughput synthesis and characterization, is able to determine the phase diagram of an entire composition spread of a binary or ternary system at a single temperature on one materials library, which, though significantly increasing efficiency, still requires many libraries processed at a series of temperatures in order to complete a phase diagram. In this paper, we propose a "one-chip method" to construct a complete phase diagram by individually synthesizing each pixel step by step with a progressive pulse of energy to heat at different temperatures while monitoring the phase evolution on the pixel in situ in real time. Repeating this process pixel by pixel throughout the whole chip allows the entire binary or ternary phase diagram to be mapped on one chip in a single experiment. The feasibility of this methodology is demonstrated in a study of a Ge-Sb-Te ternary alloy system, on which the amorphouscrystalline phase boundary is determined.

关键词： combinatorial materials chip phase diagram pixel synthesis in-situ characterization phase-boundary determination

Stripping Voltammetric Analysis of Mercury at Base-treated Graphene Oxide Electrodes

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Chemical Research in Chinese Universities 2018年第6期34卷 971-977页

作者： QIU Yaru dong Lini xiang dong LI Li ZHU Liande Key Laboratory of Nanobiosensing and Nanobioanalysis at Universities of Jihn Province School of Chemtstry Northeast Normal University Changchun 130024 P. R. China

According to the Rourke＇s model, graphene oxide（GO） synthesized from the oxidation of graphite actual- ly consisted of partly oxidized graphene sheets and highly oxidized debris（OD）. The OD was strongly adhered to the surface of graphene sheets, while they could be facilely removed by a base-washing procedure. The existence and removal by base-washing of OD were characterized by means of thermogravimetric analysis（TGA）, FTIR spectros- copy, X-ray photoelectron spectroscopy（XPS）, transmission electron microscopy（TEM） and Raman spectroscopy. The adsorption of O13 not only made a great difference to the physical and chemical properties of GO, but also af- fected its electrochemical behavior when it was employed as an electrode material. In this article, we demonstrated that the electrochemical deposition and the subsequent voltammetric stripping analysis of mercury were significantly influenced by the presence of OD. The conseqnence suggests that the presence of OD on the sheets of GO restricts the electrochemical deposition behavior of mercury and further lowers the sensitivity of the voltammetric stripping responses. The sensitivity was observed as 0.78A·L·mo1^-1 at base-washed（bw）-GO/GC（glassy carbon） better than that at as-prepared GO（a-GO）/GC for 0.28 A·L·mo1^-1. The limit of detection was calculated as 2.95 and 0.83 μmol/L before and after removing the OD, respectively. The availability of both electrodes was evaluated by detecting Hg^2＋ in lake water specimens using standard samples recovery.

关键词： Graphene oxide Oxide debris Stripping voltammetry Mercury

Preparation and characterization of nanostructured Bi_2Se_3 and Sn_(0.5)-Bi_2Se_3

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Rare Metals 2009年第2期28卷 112-116页

作者： Liu, Kegao Wang, Jiyang Liu, Hong xiang, dong State Key Laboratory of Crystal Materials Shandong University Jinan 250100 China School of Materials Science and Engineering Shandong Jianzhu University Jinan 250101 China

Nanostructured Bi2Se3 and Sn0.5-Bi2Se3 were successfully synthesized by hydrothermal coreduction from SnCl2?H2O and the oxides of Bi and Se. The products were characterized by X-ray diffraction (XRD),transmission electron microscopy (TEM),and field emission scanning electron microscope (FESEM). Bi2Se3 powders obtained at 180°C and 150°C consist of hexagonal flakes of 50-150 nm in side length and nanorods of 30-100 nm in diameter and more than 1 μm in length. The product obtained at 120°C is composed of thin...

关键词： growth from solution nanomaterials hydrothermal method Bi2Se3