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Study on specific interaction of new ferrocene-substituted carborane conjugates with hemoglobin protein

science china Chemistry 2012年第4期55卷 594-603页

作者： wu ChunHui1,3, YE HongDe2, JIANG Hui1, wang XueMei1 & YAN Hong2 1State Key Lab of Bioelectronics (Chien-Shiung wu Lab), Southeast univ.rsity, nanjing 210096, china 2State Key Laboratory of Coordination Chemistry school of Chemistry and Chemical Engineering, nanjing univ.rsity, nanjing 210093, china 3school of Life science and technology, univ.rsity of Electronic science and technology of china, Chengdu 610054, china 1. State Key Lab of Bioelectronics (Chien-Shiung wu Lab) Southeast University Nanjing 210096 China3. School of Life Science and Technology University of Electronic Science and Technology of China Chengdu 610054 China2. State Key Laboratory of Coordination Chemistry school of Chemistry and Chemical Engineering Nanjing University Nanjing 210093 China

The interactions between the new organometallic complexes, ferrocenesubstituted dithioocarborane conjugates （denoted as FcSB1, FcSB2 and FcSBCO） and hemoglobin （Hb） are investigated by electrochemistry, fluorescence and UVvis absorption spectroscopy. The results demonstrate that FcSB1, FcSB2 and FcSBCO can bind to the heme iron center through the replacement of the weakly bound H20/02 in the distal heme pocket of Hb by their sulfur donor atoms, inducing the allosteric change from the R state （oxygenated conformation, relax） to T state （deoxygenated conformation, tense）. The binding affinity is in the order of FcSBCO〉FeSB2〉FeSB1. Moreover, the fluorescence study illustrates that the three ferrocenecarborane conjugates differently affect the quarterly and tertiary structures as well as the polarity in the surrounding of the Trp and Tyr residues in Hb. Typically, FcSB2 mainly induces alterations of the microenvironment around the 1337Trp residue which is located on the cql32 interface of Hb. Such distinct influences are attributed to the structural features of FcSB1, FcSB2 and FcSBCO containing hydrophobic ferrocenyl and carboranyl units as well as C=O group. Screening the proteinbinding behavior can signify the potential bioactivity of such molecules and may be helpful in the future development of promising multifunctional metallodrugs.

关键词： fluorescence – UV vis absorption spectroscopy – differential pulse voltammetry – biomolecular interaction – ferrocene substituted carborane conjugates – hemoglobin

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Uniform estimate for maximum of randomly weighted sums with applications to insurance risk theory

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science china Mathematics 2005年第10期48卷 1379-1394页

作者： wang Dingcheng~1 SU Chun~2 & ZENG Yong~1 1. school of Management and school of Applied Mathematics,univ.rsity of Electronic science and technology of china,Chengdu 610054,china 2. Department of Statistics and Finance,univ.rsity of science and technology of china,Hefei 230026,china 1. school of Management and school of Applied Mathematics University of Electronic Science and Technology of China 610054 Chengdu China 2. Department of Statistics and Finance University of Science and Technology of China 230026 Hefei China

This paper obtains the uniform estimate for maximum of sums of independent and heavy-tailed random variables with nonnegative random weights, which can be arbitrarily dependent of each other. Then the applications to ... 详细信息

关键词： dependent stochastic return, discount factor, heavy-tails, discrete time insurance risk model, maxima of randomly weighted sums, ruin probability, tail probabilities, uniformly asymptotic estimate.

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Geometrical transition properties of vortex cavitation and associated flow-choking characteristics in poppet valves

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Journal of Zhejiang univ.rsity-science A(Applied Physics & Engineering) 2024年第6期25卷 455-469页

作者： liang LU Zhongdong liang Yuming LIU Zhipeng wang Shohei RYU school of Mechanical Engineering Tongji UniversityShanghai 201804China Frontiers science Center for Intelligent Autonomous Systems Tongji UniversityShanghai 201210China Technical Research Laboratory Hitachi Construction Machinery Co.Ltd.Tsuchiura 300-0013Japan

Poppet valves have become increasingly significant in ensuring precise digital flow rate and pressure control in hydraulic systems,necessitating a more profound understanding of the geometrical properties of cavitation in them,as well as associated flow-choking *** a comparative analysis with experimentally observed cavity images,we found that large eddy simulation(LES)turbulence modeling effectively replicates the geometrical properties of cavitation in these *** analysis demonstrated that cavitation is generated from vortices that result from the interaction between the notch contracta flow and the surrounding fluid *** in the internal or external vena contracta conditions result in fixed or discrete cavities,and the length-to-diameter ratio serves as a measure of the transition between internal and external vena contracta flow *** study establishes a threshold length-to-diameter ratio of approximately 2 for the tested poppet *** specifically,in notch structures with a smaller valve opening,longer sealing length,and smaller throttling angle(corresponding to a larger length-to-diameter ratio),the liquid-to-vapor transfer process is more evident than that in the reverse direction.A long-standing vapor cavity becomes fixed inside the notch,leading to a more pronounced flow-choking *** contrast,for structures with a smaller length-to-diameter ratio,the cavitation process for discrete vapor cavities is more complete,ensuring fluid flow continuity and significantly reducing the occurrence of the flow-choking phenomenon.

关键词： Poppet valves Vena contracta Vortex flow Vapor cavity Flow-choking

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Bioinspired Tactile Sensation Based on Synergistic Microcrack-Bristle Structure Design toward High Mechanical Sensitivity and Direction-Resolving Capability

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Research 2024年第1期2023卷 611-624页

作者： Yiqun Zhang Qi Liu Wenjuan Ren Yangyang Song Hua Luo Yangyang Han liang He Xiaodong wu Zhuqing wang school of Mechanical Engineering Sichuan UniversityChengdu 610065China Med+X Center for Manufacturing West China HospitalSichuan UniversityChengdu 610041China State Key Laboratory of Polymer Materials Engineering Polymer Research Institute of Sichuan UniversityChengdu 610065China

Natural tactile sensation is complex,which involves not only contact force intensity detection but also the perception of the force direction,the surface texture,and other mechanical ***,the vast majority of the developed tactile sensors can only detect the normal force,but usually cannot resolve shear force or even distinguish the directions of the ***,we present a new paradigm of bioinspired tactile sensors for resolving both the intensity and the directions of mechanical stimulations via synergistic microcrack-bristle structure design and cross-shaped configuration *** microcrack sensing structure gives high mechanical sensitivity to the tactile sensors,and the synergistic bristle structure further amplifies the sensitivity of the *** cross-shaped configuration engineering of the synergistic microcrack-bristle structure further endows the tactile sensors with good capability to detect and distinguish the directions of the applied mechanical *** as-fabricated tactile sensors exhibit a high sensitivity(25.76 N^(−1)),low detection limit(5.4 mN),desirable stability(over 2,500 cycles),and good capability to resolve both mechanical intensity and directional *** promising application scenarios,surface texture recognition and biomimetic path explorations are successfully demonstrated with these tactile *** newly proposed tactile sensation strategy and technology have great potential applications in ingenious tactile sensation and construction of various robotic and bionic prostheses with high operational dexterity.

关键词： crack sensation directions

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Low-Strain and High-Energy KVPO4F Cathode with Multifunctional Stabilizer for Advanced Potassium-Ion Batteries

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Energy & Environmental Materials 2024年第5期7卷 144-153页

作者： Yongli Heng Zhenyi Gu Jinzhi Guo Haojie liang Yan Liu Wei Guo Xinxin Zhao Xiaotong wang Xinglong wu MOE Key Laboratory for UV Light-Emitting Materials and technology Northeast Normal University Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province Gannan Normal University Department of Chemistry Northeast Normal University

KVPO4F with excellent structural stability and high operating voltage has been identified as a promising cathode for potassium-ion batteries （PIBs）,but limits in sluggish ion transport and severe volume change cause insufficient potassium storage ***,a high-energy and low-strain KVPO4F composite cathode assisted by multifunctional K2C4O4electrode stabilizer is exquisitely *** electrochemical investigations demonstrate that this composite cathode can deliver a remarkable energy density up to 530 Wh kg-1with 142.7 mAh g-1of reversible capacity at25 mA g-1,outstanding rate capability of 70.6 mAh g-1at 1000 mA g-1,and decent cycling ***,slight volume change （-5%） and increased interfacial stability with thin and even cathode-electrolyte interphase can be observed through in situ and ex situ characterizations,which are attributed to the synergistic effect from in situ potassium compensation and carbon deposition through self-sacrificing K2C4O4additive.

关键词： high energy density K2C4O4 KVPO4F composite cathode low strain potassium-ion batteries

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Numerical simulations and experimental investigations on transverse effects of two-wave mixing in a photovoltaic photorefractive crystal

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science china(Physics,Mechanics & Astronomy) 2010年第5期53卷 856-863页

作者： CAI Xin1,2,LIU JinSong1 & wang ShengLie1 1 wuhan National Laboratory for Optoelectronics,school of Optoelectronic science and Engineering,Huazhong univ.rsity of science and technology,wuhan 430074,china 2 school of science,wuhan univ.rsity of technology,wuhan 430070,china 1. wuhan National Laboratory for Optoelectronics School of Optoelectronic Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China2. School of Science Wuhan University of Technology Wuhan 430070 China

The transverse effects of two Gauss waves mixing in a photovoltaic photorefractive crystal,i.e.,the dynamical evolutions of signal beam with different parameters,are traced numerically and *** the one-dimensional numerical simulations and two-dimensional experimental investigations show that the self-focusing effect of signal beam becomes more obvious as the intensity of pump beam and the angle between the signal and pump beams *** accordance with these results,the state of two Gaussian waves mixing is controllable.

关键词： numerical simulation experimental investigation two-wave mixing transverse effects Gaussian distribution

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A study of two-dimensional magnetic polaron

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science china(Physics,Mechanics & Astronomy) 2006年第4期49卷 421-429页

作者： LIU Tao1, ZHANG Huaihong1, FENG Mang1,2 & wang Kelin1,3 1. school of science, Southwest univ.rsity of science and technology, Mianyang 621010, china 2. wuhan Institute of Physics and Mathematics, Chinese Academy of sciences, wuhan 430070, china 3. Department of Modern Physics, univ.rsity of science and technology of china, Hefei 230026, china school of science Southwest University of Science technology Mianyang 621010 China wuhan Institute of Physics Mathematics Chinese Academy of Sciences Wuhan 430070 China Department of Modern Physics University of Science technology of china Hefei 230026 China

By using the variational method and anneal simulation, we study in this paper the self-trapped magnetic polaron (STMP) in two-dimensional anti-ferromagnetic material and the bound magnetic polaron (BMP) in ferromagnetic material. Schwinger angular momentum theory is applied to changing the problem into a coupling problem of carriers and two types of Bosons. Our calculation shows that there are single-peak and multi-peak structures in the two-dimensional STMP. For the ferromagnetic material, the properties of the two-dimensional BMP are almost the same as that in one-dimensional case; but for the anti-ferromagnetic material, the two-dimensional STMP structure is much richer than the one-dimensional case.

关键词： self-trapped magnetic polaron, bound magnetic polaron, impurity potential, anti-ferromagnet.

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Application of Fourier Slice Theorem in Wigner Operator Theory and New Complete Representation

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Communications in Theoretical Physics 2009年第11期52卷 829-831页

作者： wang Tong-Tong~1 and FAN Hong-Yi~(2,3)1 school of Mathematics and Physics, Huangshi Institute of technology, Huangshi 435003, china2 Department of Material science and Engineering, univ.rsity of science and technology of china, Hefei 230026, china3 Department of Physics, Shanghai Jiao Tong univ.rsity, Shanghai 200030, china school of Mathematics and Physics Huangshi Institute of Technology Huangshi 435003 China Department of Material science and Engineering University of Science and Technology of China Hefei 230026 China Department of Physics Shanghai Jiao Tong University Shanghai 200030 China

By applying the Fourier slice theorem,S;（λ）=∫;P;（t）e;=F（λcosθ,λsinθ）,where P;（t）is aprojection of f（x,p）=（?）F（u,v）e;dudv along lines of constant,to the Wigner operator we are naturally led toa projection operator（pure state）,which results in a new complete *** Weyl orderimg formalism of theWigner operator is used in the derivation.

关键词： Wigner operator Fourier slice theorem new complete representation

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Kinetic characteristics of continuous flow polymerase chain reaction chip: A numerical investigation

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science china(Technological sciences) 2010年第7期53卷 1967-1972页

作者： wang ShiYing1 & wang Wei2,3 1 school of Physics, Peking univ.rsity, Beijing 100871, china 2 Institute of Microelectronics, Peking univ.rsity, Beijing 100871, china 3 National Key Laboratory of science and technology on Micro/Nano Fabrication, Beijing 100871, china 1. school of Physics Peking University Beijing 100871 China2. Institute of Microelectronics Peking University Beijing 100871 China3. National Key Laboratory of Science and Technology on Micro/Nano Fabrication Beijing 100871 China

Continuous flow PCR (polymerase chain reaction) chip holds impressive advantages compared to micro chamber PCR chip. In order to have better understanding of kinetic characteristics of continuous flow PCR chip, a comprehensive mathematical model is presented in this paper, including melting, annealing and extension phases of a typical PCR process which has the essence of a convection-diffusion-reaction system. Using this model, we can simulate the PCR process in series of reaction cycles. Numerical results show that the average sample velocity plays a significant role in affecting the amplification efficiency. Also, appropriate combination of the PCR mixture is important for high-quality DNA amplification. Giving a large initial DNA concentration range, the continuous flow PCR scheme holds excellent real-time detection ability theoretically. The present numerical model bridges the temperature distribution to the real DNA amplification, and thereby is able to successfully predict continuous flow PCR properties which are important for the chip design.

关键词： continuous flow PCR chip numerical simulation convection-diffusion-reaction system

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Phase transition in the Zr_(60)Al_(15)Ni_(25) bulk metallic glass subjected to rolling at room temperature

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science china(Technological sciences) 2006年第6期49卷 655-662页

作者： YAN Zhijie1, 2, LI Jinfu1, ZHOU Yaohe1 & wu Yanqing3 1. State Key Laboratory of Metal Matrix Composites, school of Materials science and Engineering, Shanghai Jiao Tong univ.rsity, Shanghai 200030, china 2. school of Materials science and Engineering, Taiyuan univ.rsity of science and technology, Taiyuan 030024, china 3. school of Environmental science and Engineering, Shanghai Jiao Tong univ.rsity, Shanghai 200030, china State Key Laboratory of Metal Matrix Composites School of Materials Science Engineering Shanghai Jiao Tong University Shanghai 200030 China school of Materials science Engineering Taiyuan University of Science technology Taiyuan 030024 China school of Environmental science Engineering Shanghai Jiao Tong University Shanghai 200030 China

The microstructure evolution of the Zr60Al15Ni25 metallic glass during rolling at room temperature is investigated by X-ray diffraction (XRD), differential scanning calorimetry (DSC); high-resolution transmission electron microscopy (HREM). The results show that the values of full width at half maximum (FWHM) of the XRD patterns; exothermic enthalpy ΔH of DSC plots do not monotonically change with the variation of deformation degrees . As is not large than 20%, the values of FWHM; ΔH are lower than that of the as-cast state. When reaches 30%, the values of FWHM; ΔH become larger than that of the as-cast state, while their values begin to decrease again as reaches about 85%. These results indicate that the reversible transitions between ordered; disordered atomic configurations occur during rolling, which is further verified by the HREM images. The reversible phase transition can be explained by the competition between the diffusion controlled reordering; shear-induced disordering during rolling.

关键词： metallic glasses, plastic deformation, phase transformations, shear bands.

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