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Tuning spin reorientation in Er1–xYxFeO3 single crystal family

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Frontiers of physics 2019年第1期14卷 105-110页

作者： Ning Yuan Ru-Bin Li You-Shuang Yu Zheng-Jie Feng Bao-Juan Kang shi-yi zhuo Jun-yi Ge Jin-Cang Zhang shi-Xun Cao Department of Physics International Center of Quantum and Molecular Structures Shanghai University Shanghai 200444 China Materials Genome Institute Shanghai University Shanghai 200444 China Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 200050 China

A temperature-induced spin reorientation transition between Г4 (Gx, Ay, Fz) and Г2 (Fx, Cy, Gz) has been studied in the family of Er1–xYxFeO3 (x = 0, 0.25, 0.5, 0.75, 1) single crystals. By doping nonmagnetic Y3+, we tuned the spin reorientation temperature to low temperature with increasing x. Moreover, the typical compensation point and spin flip transition of ErFeO3 also decreases with doping, and disappears above x = 0.75. We also report the Rietveld refinements and Raman spectroscopy of Er1–xYxFeO3, where some Raman peaks are shifted to low frequency with increasing doping. Our results shed light on the understanding of the interaction between two magnetic sub-lattices of rare earth (R3+) and iron (Fe3+) ions, and will also contribute to the materials design and potential applications.

关键词： Er1–xYxFeO3 single crystal growth magnetic measurements

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从张家山汉简看西汉初年的继承制度

安庆师范学院学报（社会科学版） 2010年第5期29卷 70-75页

作者：石卓义刘春节安庆师范学院外国语学院安徽安庆246133

张家山汉简为研究西汉初年的继承制度提供了第一手资料,西汉初年的继承分为户籍继承、财产继承和爵位继承,把张家山汉简反映出来的西汉继承制度与现实情况结合起来考察有着重要意义。

关键词：张家山汉简立户继承制度爵位继承

Superhydrophobic and corrosion-resistant siloxane-modified MgAl-LDHs coatings on magnesium alloy prepared under mild conditions

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 450-463页

作者： Wenxi Zhang Zhangzelong zhuo Dan Xu Liang Wu Zhihui Xie Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province College of Chemistry and Chemical EngineeringChina West Normal UniversityNanchong 637002China College of Materials Science and Engineering/National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China

We have developed a superhydrophobic and corrosion-resistant LDH-W/PFDTMS composite coating on the surface of Mg *** composite comprised a tungstate-intercalated(LDH-W)underlayer that was grown at low temperature(relative to hydrothermal reaction conditions)under atmospheric pressure and an outer polysiloxane layer created from a solution containing perfluorodecyltrimethoxysilane(PFDTMS)using a simple immersion *** successful intercalation of tungstate into the LDH phase and the following formation of the polysiloxane layer were confirmed through X-ray diffraction(XRD),Fourier transform infrared(FTIR)spectroscopy,and X-ray photoelectron spectroscopy(XPS).The corrosion resistance of the LDH-W film,both before and after the PFDTMS modification,was evaluated using electrochemical impedance spectroscopy(EIS),Tafel curves,and immersion *** results showed that Mg coated with LDH-W/PFDTMS exhibited significantly enhanced corrosion protection compared to the unmodified LDHW film,with no apparent signs of corrosion after exposure to 3.5wt%NaCl solution for 15 ***,the LDH-W/PFDTMS coating demonstrated superior superhydrophobicity and self-cleaning properties against water and several common beverages,as confirmed by static contact angle and water-repellency *** results offer valuable insights into preparing superhydrophobic and corrosion-resistant LDH-based composite coatings on Mg alloy surfaces under relatively mild reaction conditions.

关键词： Mg alloy corrosion coating layered double hydroxide

Control strategy for microgrid under three-phase unbalance condition

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Journal of Modern Power Systems and Clean Energy 2016年第1期4卷 94-102页

作者： Hongtao shi Fang zhuo Hao yi Zhiqing GENG School of Electrical Engineering Xi’an Jiaotong UniversityXi’an 710000 China

Microgrid(MG) is generally developed at utility terminal which contains lots of unbalanced loads and distributed generations(DGs). The interaction between MG and the unbalance loads or DGs will degrades the control performance of interfaced inverter in MG and dramatically leads to MG voltage unbalance. In this paper, a negative-sequence compensation based three-phase voltage unified correction strategy is proposed. While MG operates in islanded mode, a positive virtual impedance control is used to eliminate the negative voltage resulted from the negative-sequence current,and then a positive-sequence voltage control loop and negative-sequence control loop are used to improve the inverter control performance. While MG operates in grid-tied mode,the inverter operates as a negative-sequence current source to compensate the negative-sequence currents of loads to guarantee the point of common coupling(PCC) voltage *** using the proposed strategy, the voltage control performance of inverter can be improved;the MG power quality can be enhanced significantly. Simulation and experimental results verify the effectiveness of the proposed method.

关键词： Microgrid Inverter Three-phase unbalance Negative compensation

研究型大学赋能区域创新发展的理论审思与策略——以粤港澳大湾区为例

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华东师范大学学报（教育科学版） 2025年第1期43卷 67-80页

作者：卓泽林华南师范大学国际与比较教育研究所/东南亚文化教育研究中心广州510631

作为粤港澳大湾区区域创新系统的重要组成部分,研究型大学在推动区域创新中应发挥关键支撑作用。但现状是该地区创新系统主导力量仍是企业和政府,研究型大学在当中的作用有待进一步提升。基于三螺旋和区域创新系统理论以及对访谈材料的... 详细信息

作为粤港澳大湾区区域创新系统的重要组成部分,研究型大学在推动区域创新中应发挥关键支撑作用。但现状是该地区创新系统主导力量仍是企业和政府,研究型大学在当中的作用有待进一步提升。基于三螺旋和区域创新系统理论以及对访谈材料的质性分析,本文剖析了粤港澳大湾区创新体系的主要构成要素,探讨了研究型大学在其中的定位和作用,并从知识生产、科研成果的转化扩散和人力资本培养等方面分析了阻碍研究型大学在大湾区创新体系发挥作用的因素。最后提出通过完善人才评价激励制度、打通大学企业旋转门机制、创新人才培养模式等举措来强化研究型大学在大湾区创新区域发展中的重要作用。

关键词：粤港澳大湾区区域创新生态系统三螺旋研究型大学

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Integrative Medicine Intervention for Chronic Disease Management——Cardiovascular Disease

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Chinese Journal of Integrative Medicine 2018年第12期24卷 883-885页

作者： shi Da-zhuo Center of Cardiology Xiyuan HospitalChina Academy of Chinese Medical Sciences

Cardiovascular disease （CVD） is a leading life-threatening chronic disease in China. In the primary and secondary prevention, remarkable achievements have been made during past decades. In treating coronary artery disease （CAD）, for example, the advanced treatment approaches, suchas percutaneous coronary intervention （PCI） guided by intracoronary imaging, minimally-invasive coronary artery bypass graft （CABG）, and novel drugs for better control of the risk factors including hypertension, hyperglycemia and dyslipidemia, have been widely used in clinical practice.

关键词： ACS Cardiovascular Disease CVD PCI

STUDIES ON THE TWO-DIMENSIONAL FREE HYDRAULIC JUMP TAKING ACCOUNT OF TURBULENCE INTENSITY AND OTHER FACTORS

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Journal of Hydrodynamics 1991年第2期3卷 71-74页

作者： Ding, zhuo-yi Yangtze River Scientific Research Inst Wuhan China

Taking account of turbulence intensity, non-uniformity of velocity distribution at the initial and sequent section of hydraulic jump and frictional drag on the floor within jump range, this paper derives new formulas for calculating the ratio of conjugate depths and the efficiency of energy dissipation in the two-dimensional free hydraulic jump. It has been verified by test data that the new formulas are not only exact in theory but also still better in conformity with practice.

关键词： Flow Of Fluids Turbulent Hydraulic Jump Friction Hydraulics

Theoretical study of magnetic lens with parallel beam matched

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Nuclear Science and Techniques 2017年第2期28卷 12-17页

作者： Guo-Jun Yang zhuo Zhang Tao Wei yi-Ding Li Xiao-Ding Zhang Jin-Shui shi Institute of Fluid Physics Chinese Academy of Engineering Physics Key Laboratory of Pulsed Power Chinese Academy of Engineering Physics

The magnetic lens(Zumbro lens) is a critical part in proton radiography. Traditionally the matched beam for Zumbro lens in proton radiography is a virtual point source beam, which is not suitable for some cases, such as cylindrical samples. In these cases, a parallel beam is more appropriate. In this paper, a method, which uses quadrupole beamline, is proposed for designing a magnetic lens with parallel beam matched. Theoretical analysis is given. The results show that the matched beam for this lens is indeed parallel beam, while the major merits of Zumbro lens are inherited. Following this method, a theoretical design based on the 11-Me V cyclotron is presented.

关键词： Proton radiography Magnetic lens Chromatic blur Parallel beam Match

Control on the Morphology of ABA Amphiphilic Triblock Copolymer Micelles in Dioxane/Water Mixture Solvent

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Chinese Journal of Polymer Science 2018年第6期36卷 728-735页

作者： Yuan Gan Zhi-Da Wang zhuo-Xin Lu Yan shi Hong-yi Tan Chang-Feng Yan Key Laboratory of Renewable Energy Guangzhou Institute of Energy ConversionChinese Academy of SciencesGuangzhou 510640China Guangdong Key Laboratory of New and Renewable Energy Research and Development Guangzhou 510640China University of Chinese Academy of Sciences Beijing 100049China

This work offers a typical understanding of the factors that govern the nanostructures of poly（4-vinyl pyridine）-b-polystyrene-bpoly（4-vinyl pyridine）（P4 VP-b-PS-b-P4 VP） block copolymers（BCs） in dioxane/water, in which water is a selective solvent for the P4 VP block. It is achieved through an investigation of the amphiphilic triblock copolymer micelles by variation of three different factors, including water content（above CWC but under the immobile concentration）, temperature（ranging from 20 °C to 80 °C）, and copolymer composition（low and high PS block length）. Transition of bead-like micelles to vesicles is observed with the increase of water content due to the increase of interfacial energy between the copolymer and the solvent. Effect of temperature superposed on that of water content results in various morphologies, such as beads, fibers, rods, capsules, toroids, lamellae, and vesicles. The interfacial tension between the BC and the solvent increases with the increase of water content but decreases with the increase of temperature, indicating that the micellar morphologies are resulted from the competitive interplay between the temperature and the water content and always change in a direction that decreases the interfacial energy. Based on the micellar structures obtained in this work and the effects of temperature superposed on water concentration, a diagram of phase evolution of different micellar morphologies is illustrated here, covering the temperature range from 20 °C to 80 °C and the water content changing from 20 vol% to 35 vol%. For the investigation of BC composition, morphological transition of vesicle-to-fiber, for high PS length, is observed as compared with bead-to-capsule for low PS length, as the temperature changes from 20 °C to 80 °C. Our research complements the protocols to control over the morphologies and the phase diagram describing P4 VP-b-PS-b-P4 VP micellar nanostructures in aqueous solution.

关键词： Micelles Morphological control Self-assembly Block copolymer