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Hausdorff dimension of Moran sets with increasing spacing

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Science China Mathematics 2013年第3期56卷 553-560页

作者： xue yumei KAMAE Teturo School of Mathematics and System Sciences LMIB Beihang University Advanced Mathematical Institute Osaka City University

For a family of homogeneous Moran sets, where at each level, subintervals are arranged with in-creasing spaces between neighboring subintervals from left to right, we obtained a formula of the Hausdorff dimensions.

关键词： Moran set Hausdorff dimension

Preparation and characterization of Ti3C2Tx with SERS properties

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Science China(Technological Sciences) 2019年第7期62卷 1202-1209页

作者： XIE XiaoJing ZHU yumei LI Fang ZHOU XiaoWei xue Tao School of Materials Science and Engineering Tianjin University Tianjin 300072 China Center for Analysis and Tests Tianjin University Tianjin 300072 China

During the preparation of MXenes, the control of the amounts of metal atoms and functional groups has a great influence on the properties of Surface Enhancement Raman Scattering(SERS) substrate materials. A freestanding Ti3C2 Txmembrane with good uniformity was prepared by HF etching of Ti3AlC2. The effect of etching time on the removal of Al atoms and the functional groups bonded to Ti3C2 was precisely characterized by XRD. In addition, by using Ti3C2 Txas the SERS substrate, a quadratic relationship between the enhancement intensity and concentration of the dye molecule rhodamine was achieved.

关键词： MXene Ti3C2Tx SERS controlling terminations

Water lubrication of graphene oxide-based materials

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Friction 2022年第7期10卷 977-1004页

作者： Shaoqing xue Hanglin LI yumei GUO Baohua ZHANG Jiusheng LI Xiangqiong ZENG Laboratory for Advanced Lubricating Materials Shanghai Advanced Research InstituteChinese Academy of SciencesUniversity of Chinese Academy of SciencesShanghai 201210China School of Environmental and Chemical Engineering Shanghai UniversityShanghai 200444China Key Laboratory for Advanced Materials School of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China

Water is as an economic,eco-friendly,and efficient lubricant that has gained widespread attention for *** graphene oxide(GO)-based materials can improve the lubricant efficacy of water lubrication due to their outstanding mechanical properties,water dispersibility,and broad application *** this review,we offer a brief introduction about the background of water lubrication and ***,the synthesis,structure,and lubrication theory of GO are *** attention is focused on the relationship between pH,concentration,and lubrication efficacy when discussing the tribology behaviors of pristine *** compounding or reacting GO with various modifiers,amounts of GO-composites are synthesized and applied as lubricant additives or into frictional pairs for different usage *** various strategies of GO-composite generate interesting effects on the tribology *** application cases of GO-based materials are described in water lubrication,including metal processing and *** advantages and drawbacks of GO-composites are then *** development of GO-based materials for water lubrication is described including some challenges.

关键词： tribology water lubrication graphene oxide(GO)

A wavelet transform method for studying the energy distribution characteristics of microseismicities associated rock failure

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Journal of Traffic and Transportation Engineering(English Edition) 2019年第6期6卷 631-646页

作者： yumei Kang Hongyuan Liu md Maniruzzaman A.Aziz Khairul Anuar Kassim College of Resources and Civil Engineering Northeastern UniversityShenyang 110004China School of Engineering University of TasmaniaHobartTAS 7001Australia Faculty of Civil Engineering Universiti Teknologi Malaysia81310 SkudaiJohorMalaysia

Microseismicity signals released during rock failure process are firstly recorded using microseismicity monitoring system.A wavelet transform scheme is then developed on the basis of the discrete wavelet transform and implemented into MATLAB to study the energy distribution characteristics of the monitored microseismicity *** wavelet transform scheme decomposes the recorded microseismicity signals into various wavelets at seven scales and eight frequency *** microseismicity energy at each frequency band is then calculated by integrating the wavelets in each *** is found that,for the microseismicity signals recorded during the uniaxial loading of the granite,the microseismicity energies are mainly distributed between the bands 7.8125-15.625 kHz,15.625-31.250 kHz and 31.25-62.5 kHz and the percentages of the released energies at these frequency bands are 8.24%,62.72%,28.08% of the total energies,*** results reveal that the microseismicity energies at these levels are directly related to the damage mechanisms of the granite although further studies are need to identify the failure *** these monitored signals were processed using wavelet transformation to find out the frequency distribution rule and the frequency band energy varying rule of the acoustic emission(AE) signals during the different rock damage and failure *** rock failure mechanism was interpreted from the perspective of the relationship between AE signal frequency change and crack *** frequency band energy distribution histograms of the microseismicity signals at different damage stages were computed and drawn by the energy calculation method of wavelet transformation implemented into *** energy percentage of the low frequency band(d7-a7) and that of the dominated frequency band(d4-d6) and their variation rule were analyzed ***,the critical damage point is that the low frequency energy percentage is above a certain threshol

关键词： Microseismicity signal Rock fracture Wavelet transform Band energy Grack

Ternary Fe3O4@PANI@Au nanocomposites as a magnetic catalyst for degradation of organic dyes

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Science China(Technological Sciences) 2017年第5期60卷 749-757页

作者： ZHU yumei ZHOU XiaoWei CHEN DongSheng LI Fang xue Tao Ahmed Saad FARAG Institute of New-Energy Materials School of Materials Science and Engineering Tianjin University Tianjin 300072 China Analysis Centre Tianjin University Tianjin 300072 China Eastman Institute for Oral Health University of Rochester Medical Center Rochester NY 14620 USA

Magnetic Fe_3O_4@PANI@Au nanocomposites are fabricated through electrostatic self-assembly and seed growth *** rate constant K_(app) is calculated to be 8.63×10^(-3) s^(-1) at room temperature for the reduction of 4-nitrophenol to 4-aminophenol with an excessive amount of NaBH_4 as a model system showing outstanding catalytic efficiency and *** recyclable performance,the catalyst exhibits slight loss in catalytic performance on the conversion of 4-nitrophenol after running for more than 10 ***,the smaller and simpler the structure,the easier the molecular structure can be degraded,and the faster the cationic dyes can be degraded than the anionic dyes,which can reveal the *** practical application,Congo red as a pollutant of the lake water is degraded rapidly after Fe_3O_4@PANI@Au is added to the solution in a few *** has been demonstrated that magnetic Fe_3O_4@PANI@Au nanoparticle composite is a promising catalyst for environment sewage.

关键词： Fe3O4@PANI@Au catalytic magnetic degradation 4-nitrophenol dyes

Temperature-field history dependence of the elastocaloric effect for a strain glass alloy

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Journal of Materials Science & Technology 2022年第8期103卷 8-14页

作者： Deqing xue Ruihao Yuan Yuanchao Yang Jianbo Pang yumei Zhou Xiangdong Ding Turab Lookman Xiaobing Ren Jun Sun Dezhen xue State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China School of Materials Science and Engineering Xi’an University of TechnologyXi’an 710048China AiMaterials Research Santa FeNew Mexico 87501USA Ferroic Physics Group National Institute for Materials ScienceTsukuba 305-0047IbarakiJapan

The singular change of the order parameter at the first order martensitic transformation(MT)temperature restricts the caloric response to a narrow temperature *** the MT is tuned into a sluggish strain glass transition by defect doping and a large elastocaloric effect appears in a wide temperature ***,an inverse elastocaloric effect is observed in the strain glass alloy with history of zerofield cooling and is attributed to the slow dynamics of the nanodomains in response to the external *** study offers a design recipe to expand the temperature range for good elastocaloric effect.

关键词： Elastocaloric effect Isothermal entropy change Strain glass

Germplasm of breeding Pseudosciaena crocea as revealed by microsatellite markers

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Acta Oceanologica Sinica 2008年第4期27卷 156-164页

作者： CHANG yumei DING Lei LI Mingyun xue Liangyi LIANG Liqun HE Jianguo LEI Qingquan Heilongjiang River Fisheries Research Institute Chinese Academy of Fishery Sciences Harbin 150070China College of Life Sciences Zhongshan University Guangzhou 510275 China Life Science of Technology Institute Dalian Fisheries University Dalian 116023 China Life Science and Biotechnology Faculty Ningbo University Ningbo 315211 China College of Electrical ＆ Electronic Engineering Harbin University of Science and Technology Harbin 150080 China

The germplasm of breeding large yellow croaker （Pseudosciaena crocea Richardson） was revealed using 12 microsatellite markers. The results showed that the genetic diversities were on a mediated level in the bred Daiqu and Min - Yue stocks and two hybrid groups, as represented by 4.83 of the mean number of alleles and 0.561 of the average observed heterozygosity. The value of pair- wise differentiation coefficient（ FST ） was only 13. 1% between Daiqu and Min -Yue stocks, demonstrating the low level of differentiation and a close relationship. However, STRUCTURE simulations and phylogenetic tree based on the UPGMA method supported that they are geographically different populations of the same species with distinct genetic structures. Examinations of individual admixture showed that Min - Yue stock had been contaminated by alien individuals. Moreover, the genetic structures of the two hybrid groups resembled those of their parents, especially affected more by their female parents. Finally, the values of average observed heterozygosity between parents and their ascendants were compared and tested, as a result of no detectable differences （P 〉 0. 05）.

关键词： Pseudosciaena crocea microsatellite marker bred stock germplasm admix

Improved stability of superelasticity and elastocaloric effect in Ti-Ni alloys by suppressing Lüders-like deformation under tensile load

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Journal of Materials Science & Technology 2023年第15期146卷 154-167页

作者： Pengfei Dang Jianbo Pang yumei Zhou Lei Ding Lei Zhang Xiangdong Ding Turab Lookman Jun Sun Dezhen xue State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China AiMaterials Research LLC Santa FeNM 87501USA

Functional stability of superelasticity is crucial for practical applications of shape memory *** is degraded by a Lüders-like deformation with elevated local stress concentration under tensile *** increasing the degree of solute supersaturation and applying appropriate thermomechanical treatments,a Ti-Ni alloy with nanocrystallinity and dispersed nanoprecipitates is *** contrast to conventional Ti-Ni alloys,the superelasticity in the target alloy is accompanied by homogeneous deformation due to the sluggish stress-induced martensitic *** alloy thus shows a fully recoverable strain of 6%under tensile stress over 1 GPa and a large adiabatic temperature decrease of 13.1 K under tensile strain of 4.5%at room ***,both superelasticity and elastocaloric effect exhibit negligible degradation in response to applied strain of 4%during *** attribute the improved functional stability to low dislocation activity resulting from the suppression of localized deformation and the combined strengthening effect of nanocrystalline structure and ***,the design of such a microstructure enabling homogeneous deformation provides a recipe for stable superelasticity and elastocaloric effect.

关键词： Ti-Ni alloys Superelasticity Elastocaloric effect Martensite band Functional stability

Interval Neutrosophic Prioritized OWA Operator and Its Application to Multiple Attribute Decision Making

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Journal of Systems Science & Complexity 2016年第3期29卷 681-697页

作者： LIU Peide WANG yumei School of Economics and Management Civil Aviation University of China School of Management Science and Engineering Shandong University of Finance and Economics

On the basis of prioritized aggregated operator and prioritized ordered weighted average(POWA)operator,in this paper,the authors further present interval neutrosophic prioritized ordered weighted aggregation(INPOWA)operator with respect to interval neutrosophic numbers(INNs).Firstly,the definition,operational laws,characteristics,expectation and comparative method of INNs are ***,the INPOWA operator is developed,and some properties of the operator are ***,based on the INPOWA operator and the comparative formula of the INNs,an approach to decision making with INNs is ***,an illustrative example is given to verify the developed approach and to demonstrate its practicality and effectiveness.

关键词： Multiple attribute decision making interval neutrosophic number prioritized OWA operator.