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Trees with Non-regular Fractal Boundary

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Acta Mathematica Sinica,English Series 2008年第8期24卷 1345-1350页

作者： Jing hu YU Yi ming DING Department of Mathematics School of Sciences Wuhan University of Technology Wuhan 430070 P. R. China Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences Wuhan 430071 P. R. China

For any given 0 〈α 〈 β 〈 ∞, we construct a tree such that under tree metric, the Hausdorff dimension of the corresponding boundary is α, but both the Packing dimension and the boxing dimension are β. Applying the connection between tree and iterated functions system, non- regular fractal sets on real line are constructed. Moreover, the method adopted in our paper is different from those which have been used before for constructing non-regular fractal set in general metric space.

关键词： tree boundary fractal dimensions non-regularity recursive structures

On Representation Theorem of G-Expectations and Paths of G-Brownian Motion

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Acta Mathematicae Applicatae Sinica 2009年第3期25卷 539-546页

作者： ming-shang hu Shi-ge Peng Institute of Mathematics Shandong University Jinan 250100 China

We give a very simple and elementary proof of the existence of a weakly compact family of probability measures {Pθ ： θ∈θ} representing an important sublinear expectation- G-expectation E[·]. We also give a concrete approximation of a bounded continuous function X（ω） by an increasing sequence of cylinder functions Lip（Ω） in order to prove that Cb（Ω） belongs to the completion of Lip（Ω） under the natural norm E[｜·｜].

关键词： Probability and distribution uncertainty G-normal distribution G-Brownian motion continuous paths

Contrasting Impacts of South and North Tropical Indian Ocean Sea Surface Temperature Anomalies on East Asian Summer Climate

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Atmospheric and Oceanic Science Letters 2015年第6期8卷 327-332页

作者： hu Kai-ming State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics & Center for Monsoon System Research Institute of Atmospheric Physics Chinese Academy of Sciences

Using observational data and model simulations,the author find that the North Indian Ocean(NIO)sea surface temperature(SST)anomalies can trigger an eastward atmospheric Kelvin wave propagating into the equatorial western Pacific,inducing an anomalous anticyclone over the subtropical Northwest Pacific(NWP)and resulting in prominent summer climate anomalies in the East Asia-Northwest Pacific(EANWP)***,the response of tropospheric temperatures and atmospheric Kelvin waves to the South Indian Ocean(SIO)SST anomalies is weak;as a result,the impact of the SIO SST anomalies on the EANWP summer climate is *** contrasting impacts of NIO and SIO SST anomalies on the EANWP summer climate is possibly due to the different mean state of SSTs in the two *** summer,the climatological SSTs in the NIO are higher than in the SIO,leading to a stronger response of atmospheric convection to the NIO SST anomalies than to the SIO SST ***,compared with the SIO SST anomalies,the NIO SST anomalies can lead to stronger tropospheric air temperature anomalies and atmospheric Kelvin waves to affect the EANWP summer climate.

关键词： Indian Ocean Northwest Pacific anticyclone East As

Synthesis and Characterization of Pr(DPM)_3 Served as Precursor for MOCVD

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Chemical Research in Chinese Universities 2007年第3期23卷 258-262页

作者： LIU ming-fei hu Yong-xing JIANG yin-zhu GAO Jian-feng WANG Yan-yan MENG Guang-yao USTC Laboratory for Solid State Chemistry ＆ Inorganic Membranes Department of Materials Science and Engineering University of Science and Technology of China Hefei 230026 P. R. China

Praseodymium β-diketone chelate, Pr （DPM）3 [ DPM = 2,2,6,6 -tetramethyl-3,5-heptanedionato ], was successfully synthesized from the inorganic salt praseodymium chloride and HDPM（2,2,6,6-tetramethyl-3,5-heptane-dione） in an ethanol/aqueous solution followed distillation at low pressure and recrystallization from toluene. The physical and thermal properties of the chelate, including volatility, stability, and thermal decomposition, were investigated by elemental analyses, 1^H NMR spectroscopy, XRD, TG/DTG/DTA analysis, infrared spectroscopy, and mass spectroscopy. The chelate with high purity prepared by the authors of this study also shows sufficient volatility and Stability in inert gases, which could be used as the precursor for metal-organic chemical vapor deposition（MOCVD）.

关键词： MOCVD Chemical synthesis Thermo-gravimetric analysis Infrared spectroscopy

2-D/2-D heterostructured biomimetic enzyme by interfacial assembling Mn_(3)(PO_(4))_(2) and MXene as a flexible platform for realtime sensitive sensing cell superoxide

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Nano Research 2021年第3期14卷 879-886页

作者： Shen Fei Zhao Fang Xin hu Zhuan Zhuan Shi Jing Jing Fu Yue Chen Fang yin Dai Chun Xian Guo Chang ming Li Institute of Materials Science and Devices Suzhou University of Science and TechnologySuzhou215009China Institute for Clean Energy and Advanced Materials Southwest UniversityChongqing400715China State Key Laboratory of Silkworm Genome Biology Southwest UniversityChongqing400715China Institute for Advanced Cross-field Science&College of Life Science Qingdao UniversityQingdao200671China

It is critical for fabricating flexible biosensors with both high sensitivity and good selectivity to realize real-time monitoring superoxide anion(O_(2)^(·−)),a specific reactive oxygen species that plays critical roles in various biological *** work delicately designs a Mn_(3)(PO_(4))_(2)/MXene heterostructured biomimetic enzyme by assembling two-dimensional(2-D)Mn_(3)(PO_(4))_(2) nanosheets with biomimetic activity and 2-D MXene nanosheets with high conductivity and abundant functional *** 2-D nature of the two components with strong interfacial interaction synergistically enables the heterostructure an excellent flexibility with retained 100%of the response when to reach a bending angle up to 180°,and 96%of the response after 100 bending/relaxing *** is found that the surface charge state of the heterostructure promotes the adsorption of O_(2)^(·−),while the high-energy active site improves electrochemical oxidation of O_(2)^(·−).The Mn_(3)(PO_(4))_(2)/MXene as a sensing platform towards O2•−achieves a high sensitivity of 64.93µA·µM^(−1)·cm^(−2),a wide detection range of 5.75 nM to 25.93µM,and a low detection limit of 1.63 ***,the flexible heterostructured sensing platform realizes real-time monitoring of O_(2)^(·−)in live cell assays,offering a promising flexible biosensor towards exploring various biological processes.

关键词： two-dimensional(2-D)nanosheets assembled heterostructure interface flexible biosensor real-time monitoring

Microstructure and mechanical properties of friction stir welding joint during post weld heat treatment with different zigzag lines

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Rare Metals 2019年第11期38卷 1070-1077页

作者： Zhi-Li hu Qiu Pang ming-Liang Dai hubei Key Laboratory of Advanced Technology of Automobile Components Wuhan University of TechnologyWuhan 430070China hubei Collaborative Innovation Center for Automotive Components Technology Wuhan University of TechnologyWuhan 430070China School of Mechanical and Electrical Engineering Wuhan Donghu UniversityWuhan 430212China

Zigzag line is a common defect in friction stir welding(FSW) *** formation mechanism of the zigzag line in Al-Cu alloy FSW joint and its influence on the microstructure and mechanical properties during post weld heat treatment(PWHT) were studied by scanning electron microscopy(SEM),microhardness and tensile *** is found that the occurrence of zigzag line for PWHT joint is determined by PWHT process which in nature depends on residual stress and thermal stress of FSW *** optimization of PWHT process to reduce the residual and thermal stress can trigger for the deterioration of mechanical properties of PWHT joints with zigzag *** obvious decrease of tensile properties is observed for T6-450 and T6-495 joints although zigzag line appears in the *** determines the sizes of zigzag line cracks and consequently determines the fracture location and characteristics of FSW joint.

关键词： Friction stir welding Post weld heat treatment Zigzag line Mechanical properties

The study of electrochemical cycle for LiCoO_(2) by dual-mode EPR

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Magnetic Resonance Letters 2023年第1期3卷 61-66,I0003页

作者： Bei hu Fushan Geng ming Shen Bingwen hu Shanghai Key Laboratory of Magnetic Resonance State Key Laboratory of Precision SpectroscopySchool of Physics and Electronic ScienceEast China Normal UniversityShanghai200241China

Dual-mode electron paramagnetic resonance(EPR)spectroscopy was employed to analyze redox mechanisms in lithium cobalt oxide LiCoO_(2)(LCO)cathode material during delithiation and *** was found that the O_(3)-II could not fully convert back to the pristine O_(3) -I phase while oxygen vacancies quickly generate and accumulate during the *** study paves the way for better understanding the doping effects of different elements on LiCoO_(2) in the future.

关键词： LiCoO_(2) EPR Redox mechanism Lithium-ion battery

Growth Mechanism of Different Morphologies of ZnO Crystals Prepared by Hydrothermal Method

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Journal of Materials Science & Technology 2011年第2期27卷 153-158页

作者： hu Wang Juan Xie Kangping Yan ming Duan State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500China College of Materials Science and Engineering Southwest Petroleum UniversityChengdu 610500China School of Chemical Engineering Sichuan UniversityChengdu 610000China

Different morphologies of zinc oxide（ZnO）,including microrods,hexagonal pyramid-like rods and flower-like rod aggregates,had been synthesized,respectively,on glass substrates by controlling the reaction conditions（such as precursor concentration,reaction time and pH value） of hydrothermal *** morphologies of the as-obtained ZnO were observed with scanning electron microscopy and transmission electron ***,the crystalline natures of different ZnO crystals were analyzed with X-ray *** possible growth mechanism of ZnO crystals with different morphologies was discussed.

关键词： Zinc oxide Surface morphology Growth mechanism Hydrothermal method Crystal structure

Optimal interface surface determination for multi-axis freeform surface machining with both roughing and finishing

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Chinese Journal of Aeronautics 2018年第2期31卷 370-384页

作者： Lufeng CHEN Pengcheng hu ming LUO Kai TANG Hong Kong University of Science and Technology Hong Kong China National Numerical Control System Engineering Research Center Huazhong University of Science and Technology Wuhan 430074 China Key Laboratory of Contemporary Design and Integrated Manufacturing Technology Ministory of EducationNorthwestern Polytechnical University Xi'an 710072 China

In the current practice of multi-axis machining of freeform surfaces, the interface surface between the roughing and finishing process is simply an offset surface of the nominal surface. While there have already been attempts at minimizing the machining time by considering the kinematic capacities of the machine tool and/or the physical constraints such as the cutting force, they all target independently at either the finishing or the roughing process alone and are based on the simple premise of an offset interface surface. Conceivably, since the total machining time should count that of both roughing and finishing process and both of them crucially depend on the interface surface, it is natural to ask if, under the same kinematic capacities and the same physical constraints, there is a nontrivial interface surface whose corresponding total machining time will be the minimum among all the possible（infinite） choices of interface surfaces, and this is the motivation behind the work of this paper. Specifically, with respect to the specific type of iso-planar milling for both roughing and finishing, we present a practical algorithm for determining such an optimal interface surface for an arbitrary freeform surface. While the algorithm is proposed for iso-planar milling, it can be easily adapted to other types of milling strategy such as contour milling. Both computer simulation and physical cutting experiments of the proposed method have convincingly demonstrated its advantages over the traditional simple offset method.

关键词： Feed rate Finishing and roughing process Interface surface lso-planar tool path Physical constraints