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Journal of Materials Science & Technology 2008年第3期24卷 628-632页

作者： Ruiting MA Yanwen TIAN Haitao ZHAO gang zhang Hui ZHAO School of Materials Science and Engineering Shenyang Ligong University Shenyang 110168 China School of Materials and Metallurgy Northeastern University Shenyang 110004 China

Nanocrystalline Co0.5Zn0.5Fe2O4 ferrite was synthesized by polyacrylamide gel method. The electromagnetic and microwave absorption properties of the ferrite were investigated. The results indicated that calcining temperature of the ferrite had a significant influence on the effective properties of the ferrite. When the calcining temperature was 500, 600 and 700℃, the average size of particles was 10, 30 and 80 nm, respectively. The dielectric loss （ε″） and magnetic loss （μ″） of the ferrite was around 0.65 and 0.29 at 8.2 GHz, respectively. Microwave absorption properties of the ferrites were simultaneously influenced due to the strong correlation between reflection loss and electromagnetic parameters of the ferrite.

关键词： Polyacrylamide gel Nanocrystalline Co0.5Zn0.5Fe2O4 Electromagnetic properties

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Fuzzy pattern recognition method for assessing groundwater vulnerability to pollution in the zhangji area

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第11期7卷 1917-1922页

作者： MAO Yuan-yuan zhang Xue-gang WANG Lian-sheng School of the Environment Nanjing University Nanjing 210093 China Water Resources Planning Bureau of Jiangsu Province Nanjing 210029 China School of Water Resources and Envtronment Hohai University Nanjing 210098 China

Based on the widely used DRASTIC method, a fuzzy pattern recognition and optimization method was proposed and applied to the fissured-karstic aquifer of zhangji area for assessing groundwater vulnerability to pollution. The result is compared with DRASTIC method. It is shown that by taking the fuzziness into consideration, the fuzzy pattern recognition and optimization method reflects more efficiently the fuzzy nature of the groundwater vulnerability to pollution and is more applicable in reality.

关键词： Fuzzy sets recognition and optimization method Groundwater vulnerability to pollution DRASTIC

BaTiO_(3)-based ceramics with high energy storage density

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Rare Metals 2023年第4期42卷 1261-1273页

作者： Yang Li Ming-Yang Tang Zhong-gang zhang Qi Li Jing-Lei Li Zhuo Xu gang Liu Fei Li Electronic Materials Research Lab Key Lab of Education Ministry and State Key Laboratory for Mechanical Behavior of MaterialsSchool of Electronic Science and EngineeringXi’an Jiaotong UniversityXi’an710049China Laboratory of Micro/Nano Systems for Aerospace Ministry of EducationNorthwestern Polytechnical UniversityXi’an710072China School of Materials and Energy Southwest UniversityChongqing400715China

BaTiO_(3)ceramics are difficult to withstand high electric fields,so the energy storage density is relatively low,inhabiting their applications for miniaturized and lightweight power electronic *** address this issue,we added Sr_(0.7)Bi_(0.2)TiO_(3)(SBT)into BaTiO_(3)(BT)to destroy the long-range ferroelectric ***^(2+)was introduced into BT-SBT in the form of CaTiO_(3)(CT),which has the effect of inhibiting the movement of A-site defects to reduce dielectric loss and refining the grains to increase the breakdown field *** addition,we have increased the density and grain uniformity of ceramics by repeated rolling of the green samples through the viscous polymer processing(VPP),to further increase the breakdown electric *** BT-SBT-CT ceramics exhibit the high recoverable energy storage density of 4.0 J·cm^(-3)under electric field of 480 kV·cm^(-1).Its recoverable energy storage density varies by less than 8%in the temperature range of 30-150℃,indicating good temperature stability of the energy storage *** this work,the energy storage performance of barium titanate-based ceramics was greatly improved by transforming ferroelectrics into relaxor ferroelectrics and VPP method,which can bring new inspiration for the research of energy storage ceramics.

关键词： Barium titanate Energy storage Viscous polymer processing(VPP)

Prediction of multi-borehole undermine coalbed gas drainage

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Journal of Coal Science & Engineering(China) 2009年第3期15卷 295-298页

作者： zhang Zhi-gang Chongqing Research Institute China Coal Research Institute Chongqing 400037 China

By analyzing the flow character of a single drainage borehole in its effectingtime and the correlative theory introduced,the reason for 'inflexion' appearance in theflow character curve of the single draining borehole in a multi-borehole was *** theory of permeation fluid mechanics and so on as basis,the coalbed gas flowmodel was set up,and the numerical simulation analyzer was built for undermine *** the results from the analyzer,the gas capacity could be calculated underdifferent conditions and comparisons made with the site measurement data.

关键词： multi-borehole undermine coalbed gas drainage capacity prediction

Near-field 3D imaging approach combining MJSR and FGG-NUFFT

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Journal of Systems Engineering and Electronics 2019年第6期30卷 1096-1109页

作者： WANG Shuzhen FANG Yang zhang Jin’gang LUO Mingshi LI Qing School of Computer Science and Technology Xidian UniversityXi’an 710071China School of Electronics and Information Northwestern Polytechnical UniversityXi’an 710072China Institute of Optics and Electronics Chinese Academy of SciencesChengdu 610209China College of Materials Sciences and Opto-Electronic Technology University of Chinese Academy of SciencesBeijing 100049China College of Computer Science Xi’an Shiyou UniversityXi’an 710065China The Fourth Research Institute of Telecommunications Technology Co. LtdXi’an 710061China

A near-field three-dimensional(3 D)imaging method combining multichannel joint sparse recovery(MJSR)and fast Gaussian gridding nonuniform fast Fourier transform(FGGNUFFT)is proposed,based on a perfect combination of the compressed sensing(CS)theory and the matched filtering(MF)*** approach has the advantages of high precision and high efficiency:multichannel joint sparse constraint is adopted to improve the problem that the images recovered by the single channel imaging algorithms do not necessarily share the same positions of the scattering centers;the CS dictionary is constructed by combining MF and FGG-NUFFT,so as to improve the imaging efficiency and memory ***,a near-field 3 D imaging model of joint sparse recovery is constructed by combining the MF-based imaging ***,FGG-NUFFT and reverse FGG-NUFFT are used to replace the interpolation and Fourier transform in MF-based imaging methods,and a sensing matrix with high precision and high efficiency is constructed according to the traditional imaging ***,a fast imaging recovery is performed by using the improved separable surrogate functionals(SSF)optimization algorithm,only with matrix and vector ***,a 3 D imagery of the near-field target is obtained by using both the horizontal and the pitching interferometric phase *** paper contains two imaging models,the only difference is the sub-aperture method used in inverse synthetic aperture radar(ISAR)*** to traditional CS-based imaging methods,the proposed method includes both forward transform and inverse transform in each iteration,which improves the quality of *** experimental results show that,the proposed method improves the imaging accuracy by about O(10),accelerates the imaging speed by five times and reduces the memory usage by about O(10~2).

关键词： interference imaging joint sparse recovery compressed sensing(CS) matching filtering(MF) fast Gaussian gridding nonuniform fast Fourier transform(NUFFT) near-field 3D imaging

Processing limit maps for the stable deformation of dieless drawing

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International Journal of Minerals,Metallurgy and Materials 2011年第3期18卷 330-337页

作者： Yong He Xue-feng Liu Jian-xin Xie Hong-gang zhang Key Laboratory for Advanced Materials Processing （MOE） University of Science and Technology Beijing Beijing 100083 China State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China

Tin bronze wires were produced by dieless drawing. The effects of heating power, the distance between cooler and heater as well as feeding speed on the diameter, the temperature field, and the deformation region profile of the wires were investigated. The results indi-cated that each processing parameter exhibited both lower and upper limits of stable deformation based on the criterion of stable deformation with the diameter fluctuation of ±0.05 mm. Both the temperature and its gradient of the deformation region increased with increasing heating power under stable deformation, but decreased with an increase in feeding speed. As the distance between cooler and heater increased, the temperature of the deformation region increased and the slope of the deformation region profile decreased. The processing limit map of sta-ble deformation exhibited a closed curve and the unstable deformation consisted of wire breakage and diameter fluctuations.

关键词： tin bronze wire dieless drawing processing parameters turning method

miR-126-5p affects the chemosensitivity of colorectal cancer cells by regulating SPRED1, ERK1/2 pathway and apoptosis

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Genes & Diseases 2023年第3期10卷 675-678页

作者： Mingshi Xu gang zhang Xiaofan Gu Fangqin Zhao Zhongmin Yang Xiongwen zhang Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development School of Chemistry and Molecular EngineeringEast China Normal UniversityShanghai 200241China

Chemoresistance is still one of the main obstacles to treat colorectal cancer(CRC).Substantial studies on biomarkers related to chemoresistance have emerged in recent *** microRNAs(miRNA)have been reported to involved in drug resistance and CRC.1 MiR-126-5p participates in malignant behaviors of numerous cancers.2,3 However,it is not known if miR-126-5p participates in multidrug resistance in ***,the impact of miR-126-5p on drug resistance of CRC and its drug resistance mechanism have not been reported.

关键词： colorectal miR cancer

mRNA vaccines in disease prevention and treatment

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Signal Transduction and Targeted Therapy 2023年第10期8卷 4669-4698页

作者： gang zhang Tianyu Tang Yinfeng Chen Xing Huang Tingbo Liang Zhejiang Provincial Key Laboratory of Pancreatic Disease The First Affliated HospitalZhejiang University School of Medicine310oo9 HangzhouZhejiangChina Department of Hepatobiliary and Pancreatic Surgery The First Affliated HospitalZhejiang University School of Medicine310003 HangzhouZhejiangChina Zhejiang Clinical Research Center of Hepatobiliary and Pancreatic Diseases 310003 HangzhouZhejangChina The Innovation Center for the Study of Pancreatic Diseases of Zhejiang Province 310009 HangzhouZhejiangChina Cancer Center Zhejiang University310058 HangzhouZhejiangChina

mRNA vaccines have emerged as highly effective strategies in the prophylaxis and treatment of diseases,thanks largely although not totally to their extraordinary performance in recent years against the worldwide plagu... 详细信息

关键词： prevention vaccines treatment

Sb nanoparticles encapsulated in N-doped carbon nanotubes as freestanding anodes for high-performance lithium and potassium ion batteries

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Rare Metals 2023年第2期42卷 449-458页

作者： Xiao-Ping Lin Fang-Fang Xue Zhi-gang zhang Qiu-Hong Li Pen-Tung Sah Institute of Micro-Nano Science and Technology Xiamen UniversityXiamen361005China

Sb-based materials with high specific capacity have targeted as an alternative anode material for alkali metal ion ***,Sb nanoparticles embedded in hollow porous N-doped carbon nanotubes(Sb@N-C nanotubes)are used as freestanding anode for Li-ion batteries(LIBs)and K-ion batteries(PIBs).The Sb@N-C nanotubes demonstrate exceptional reversible capacity of643 mAh·g^(-1)at 0.1 A·g^(-1)with long cycle stability,as well as outstanding rate performance(219.6 mAh·g^(-1)at10 A·g^(-1))in *** the anode material of PIBs,they reveal impressive capacity of 325.4 mAh·g^(-1)at 0.1 A·g^(-1).The superior electrochemical properties mainly originate from the novel *** be specific,the obtained 3D connected network allows for quick ion and electron migration,and prevents the aggregation of Sb *** hollow porous nanotubes can not only accommodate the volume expansion of Sb nanoparticles during cycling,but also facilitate the infiltration of the electrolyte and reduce the ion diffusion *** work provides a new insight for designing advanced Sb-based anodes for alkali metal ion batteries.

关键词： Alkali metal ion batteries Freestanding electrode Hollow porous nanotube Sb@N-C nanotubes

Tailoring the Texture and Mechanical Properties of Textured-AZ31 Mg Alloy Sheets by Twinning and Recrystallization

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Acta Metallurgica Sinica(English Letters) 2022年第12期35卷 1983-1995页

作者： Hui-Hu Lu You Li Li Lu Wang-gang zhang Wei Liang School of Mechanical Engineering North University of ChinaTaiyuan 030051China College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China

In this study,a method of corrugated width limit alignment processes(CWLA)was applied to pre-twin in hot-rolled Mg alloy *** microstructure evolution and mechanical properties of the CWLA sheets were *** results demonstrated that the grain orientation was transformed from strong basal texture to RD-rotated texture after CWLA treatment and up to 22.2%of{10-12}tensile twin boundaries were produced in the *** 60±5°twin variant pairs were dominant in the twinned *** kinds of dynamic recrystallization(DRX)mechanism,i.e.,continuous DRX(CDRX)at low-temperature CWLA and the discontinuous DRX(DDRX)at high-temperature condition were *** post-annealing,the twin-induced static recrystallization(SRX)and abnormal grain growth were observed in the CWLA samples,and most twin boundaries were *** CAWL for 60 min at 300℃ and post annealing,an improvement on plasticity and strength were achieved with 55%increment for uniform elongation(UE)and 10%increment for ultimate tensile strength(UTS).

关键词： Magnesium alloy Corrugated width limit alignment processes Tension twinning Dynamic recrystallization Mechanical properties