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Strategy of preparing SmCo based films with high coercivity and remanence ratio achieved by temperature and chemical optimization

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Journal of Rare Earths 2024年第7期42卷 1289-1297,I0004页

作者： Yansong Gong Zhaoguo Qiu Sizhe Liang Xinrui Zheng Hongxia Meng Zhigang Zheng Deyang Chen Shengfu Yuan Weixing Xia Dechang Zeng J.p.liu School of Materials Science and Engineering South China University of TechnologyGuangzhou510640China Zhongshan R&D Center for Materials Surface and Thin Films Technology of the South China University of Technology Gent Materials Surface Technology(Guangdong)Co.Ltd.Zhongshan528437China Institute for Advanced Materials South China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou510006China Yangjiang Branch Guangdong Laboratory Materials Science and Technology Yangjiang Advanced Alloys LaboratoryYangjiang529500China Laboratory of Rare-Earth Magnetic Functional Materials Ningbo Institute of Material Technology and EngineeringChinese Academy of SciencesNingbo315201China Department of physics University of Texas at ArlingtonArlingtonTX76019USA

SmCo based films with excellent intrinsic magnetic properties have promising applications in micro-electro-mechanical system(MEMS).However,due to the complexity of phase composition and uncontrollable crystallization degree of SmCo hard magnetic phase in the film,both the coercivity(Hc)and remanence(Mr)of films are difficult to enhance *** this paper,SmCo based films were deposited with a Cr underlayer and capping layer on single crystal Si substrates via magnetron sputtering *** effects of annealing parameters and Sm/Co atomic ratio on the phase structure and coercivity of films are *** adjusting the Sm/Co atomic ratio from 1:5 to 1:4,Co soft magnetic phase disappears and the single phase SmCo5 is obtained,leading to the increase of coercivity of the films from 30 to 34 *** influence of deposition temperature and Cu doping on magnetic properties of SmCo based films was *** the deposition temperature increases from room temperature to 250℃,the coercivity will further increase from 34 to 51 ***,a severe kink is observed in the demagnetization curves due to the poor exchanged *** analysis of transmission electron microscopy(TEM)confirms that the average size of non-hard magnetic amorphous phase exceeds the effective exchanged coupling length of SmCo5,which contributes to the decoupling and low remanence ***,doping Cu and applying a post-annealing process can significantly improve the crystallization degree of the *** the coercivity and the remanence ratio of the demagnetization curves are greatly *** propose a plausible strategy to prepare the SmCo based films with high coercivity and remanence ratio by temperature and chemical optimization,which can be utilized in high performed MEMS devices.

关键词： Rare earths SmCo based films phase composition Crystallization conditions Coercivity Remanence ratio

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ELECTROREDUCTION　OF　Znp>2＋p>　AND　Nip>2＋p>　AND　Cup>2＋p>　IN　UREA－CHLORIDES　MELT

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中国有色金属学会会刊：英文版 1996年第2期6卷 41-44,52页

作者： liu p. Yang Q. liu G. Department of Chemistry Zhongshan University Guangzhou 510275 China

ＥＬＥＣＴＲＯＲＥＤＵＣＴＩＯＮＯＦＺｎ２＋ＡＮＤＮｉ２＋ＡＮＤＣｕ２＋ＩＮＵＲＥＡ－ＣＨＬＯＲＩＤＥＳＭＥＬＴＬｉｕＰｅｎｇ；ＹａｎｇＱｉｑｉｎ；ＬｉｕＧｕａｎｋｕｎ(ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓｔｒｙ，Ｚ... 详细信息

ＥＬＥＣＴＲＯＲＥＤＵＣＴＩＯＮＯＦＺｎp>２＋p>ＡＮＤＮｉp>２＋p>ＡＮＤＣｕp>２＋p>ＩＮＵＲＥＡ－ＣＨＬＯＲＩＤＥＳＭＥＬＴＬｉｕＰｅｎｇ；ＹａｎｇＱｉｑｉｎ；ＬｉｕＧｕａｎｋｕｎ(ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓｔｒｙ，ＺｈｏｎｇｓｈａｎＵ?..

关键词： urea-chlorides melt, electroreduction of Zn￣(2+), Ni￣(2+) and Cu￣(2+) diffusion coefficient transfer coefficient

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Multi-soliton solutions of a two-component Camassa–Holm system:Darboux transformation approach

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Communications in Theoretical physics 2020年第4期72卷 23-28页

作者： Gaihua Wang Nianhua Li Q p liu Department of Mathematics China University of Mining and TechnologyBeiing100083China School of Mathematical Sciences Huaqiao UniversityQuanzhouFujian 362021China

We propose and develop another approach to constructing multi-soliton solutions of an integrable two-component Camassa–Holm(CH2)*** the help of a reciprocal transformation and a gauge transformation,we relate the CH2 system to a negative flow of the Broer–Kaup or twoboson *** solutions of this negative flow are given in terms of Wronskians via Darboux *** the multi-soliton solutions of the CH2 system are recovered in parametric form by inverting the reciprocal transformation and the gauge transformation.

关键词： Darboux transformation reciprocal transformation two-component Camassa–Holm system multi-soliton solutions

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Effects of salvianolic acid-A on NIH/3T3 fibroblast proliferation,collagen synthesis and gene expression

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World Journal of Gastroenterology 2000年第3期6卷 361-364页

作者： liu CH Hu YY Wang XL liu p Xu LM Shanghai Univ Tradit Chinese Med Inst Liver Dis Shanghai 200032 Peoples R China

AIM To investigate the mechanisms ofsalvianolic acid A（SA-A）against liver fibrosisin *** NIH/3T3 fibroblasts were culturedroutinely,and incubated with 10-4mol/L-10-7mol/L SA-A for 22 *** cell viability wasassayed by... 详细信息

AIM To investigate the mechanisms ofsalvianolic acid A（SA-A）against liver fibrosisin *** NIH/3T3 fibroblasts were culturedroutinely,and incubated with 10p>-4p>mol/L-10p>-7p>mol/L SA-A for 22 *** cell viability wasassayed by[p>3p>H]proline incorporation,cellproliferation by[p>3p>H]TdR incorporation,cellcollagen synthetic rate was measured with[p>3p>H]proline impulse and collagenase *** total RNA was prepared from thecontrol cells and the drug treated cellsrespectively,and α（1）I pro-collagen mRNAexpression was semi-quantitatively analyzedwith *** 10p>-4p>mol/L SA-A decreased cellviability and exerted some cytotoxiciy,while10p>-5p>mol/L-10p>-7p>mol/L SA-A did not affect cellviability,but inhibited cell proliferationsignificantly,and 10p>-6p>mol/L SA-A had the besteffect on cell viability among theseconcentrations of drugs.10p>-5p>mol/L-10p>-6p>mol/LSA-A inhibited intracellular collagen syntheticrate,but no significant influence on extracellularcollagen *** 10p>-5p>mol/L and10p>-6p>mol/L SA-A could decrease α（1）I pro-collagen mRNA expression *** SA-A had potent action againstliver *** inhibited NIH/3T3 fibroblastproliferation,intracellular collagen syntheticrate and type I pro-collagen gene expression,which may be one of the main mechanisms of thedrug.

关键词： salvianolic acid-A NIH/3T3 fibroblast cell viability cell proliferation collagen gene expression

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青藏高原及其周边侏罗纪综合地层、生物群与古地理演化

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中国科学：地球科学 2024年第4期54卷 1211-1243页

作者：李建国饶馨牟林崔肖辉李鑫罗辉刘培学中国科学院南京地质古生物研究所中国科学院生物演化与环境卓越创新中心南京210008 中国科学院大学南京学院南京211135

侏罗纪是青藏高原构造演化的重要阶段,它结束了古特提斯构造演化,即将迎来印度板块的向北漂移和新特提斯的消减.地层时代是地质历史重建的基础.本文对近年来所取得的一些地层学、古生物新发现和新进展进行了综合和梳理,为青藏高原侏罗... 详细信息

侏罗纪是青藏高原构造演化的重要阶段,它结束了古特提斯构造演化,即将迎来印度板块的向北漂移和新特提斯的消减.地层时代是地质历史重建的基础.本文对近年来所取得的一些地层学、古生物新发现和新进展进行了综合和梳理,为青藏高原侏罗系建立了一个新的多重地层划分对比和时代框架.该框架包括巴颜喀拉、羌塘、拉萨-冈底斯和藏南喜马拉雅四个分区.其中,综合生物地层框架得到了很大的补充和细化,包括了一系列在青藏高原侏罗系中常见并在国际侏罗系划分对比中具有重要作用的化石门类,如海相的菊石、双壳、腕足、放射虫、有孔虫和沟鞭藻以及陆相的孢子花粉和轮藻等.通过菊石标准分子或特征属种,建立了该生物地层框架与国际地层委员会2020年侏罗纪地质年表(GTS 2020)的标准分带的对比.以此为基础,建立了青藏高原主要区块间侏罗系的横向对比.生物群对比揭示,侏罗纪时拉萨-冈底斯区与羌塘区的关系比与藏南喜马拉雅更紧密,它们总体属于东特提斯洋北缘海区同一个特征相似的生物地理区系,不太支持雅鲁藏布江缝合带特提斯是弧后小盆地的观点.综合地层、生物和沉积特征,研究认为,班公湖-怒江特提斯在晚三叠世开始张裂,可能在早侏罗世晚期已有初始洋壳增生形成;中侏罗世晚期班公湖-怒江洋发展至顶峰,随后开始收缩,羌塘地块向南俯冲与拉萨-冈底斯地块发生碰撞和拼合.

关键词：生物地层年代地层特提斯雅鲁藏布缝合带班公湖-怒江缝合带

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Fabrication of large-bulk ultrafine grained 6061 aluminum alloy by rolling and low-heat-input friction stir welding

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Journal of Materials Science & Technology 2018年第1期34卷 112-118页

作者： C.Y.liu B.Qu p.Xue Z.Y.Ma K.Luo M.Z.Ma R.p.liu Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Key Laboratory of New processing Technology for Nonferrous Metal & Materials Ministry of Education Guilin University of Technology Guangxi Key Laboratory of Universities for Clean Metallurgy and Comprehensive Utilization of Nonferrous Metal Resources Guilin University of Technology State Key Laboratory of Metastable Materials Science and Technology Yanshan University

In this study, the ultrafine grained （UFG） 6061 Al alloys fabricated by cold rolling were friction stir welded （FSW） with different rotation rates under both air cooling and rapid cooling in water. Low-heat-input parameters of 400 rpm rotation rate in water （400-Water） could effectively inhibit the coarsening of recrystallized grains, reduce the precipitation rate, and retain more dislocations of the UFG 6061 Al parent metal. 400-Water joint showed high lowest-hardness value, narrow low-hardness zone, and high tensile strength, attributing to the effect of dislocation, grain boundary, solid-solution, and precipitation hardening. This work provides an effective strategy to fabricate large-sized bulk UFG AI alloy by cold rolling with large deformation and low-heat-input FSW.

关键词： Aluminum alloys Ultrafine grained materia Friction stir welding Mechanical properties

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Lifetime measurements for some n=2 levels in Be-like S ⅩⅢ

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原子与分子物理学报 2003年第2期20卷 132-134页

作者： liu H.p. InstituteofModernphysice

Highly ionized Spectra from sulfur obtained at an energy of 80 MeV have been studied in the 19.0～53.0 nm wavelength range. Radiative lifetimes for some n =2 level in Be+-like S ⅩⅢwere measured using he beam-foil time of flight method. The results, using an arbitrarily normalized decay curves analysis, are compared with theoretical predictions and earlier measurement.

关键词：能量辐射能级跃迁离子激发态寿命实验研究分子物理学性质测定

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Dispersal of the Zhujiang River(pearl River) derived sediment in the Holocene

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Acta Oceanologica Sinica 2014年第8期33卷 1-9页

作者： GE Qian liu J.p. XUE Zuo CHU Fengyou Key Laboratory of Submarine Geosciences State Oceanic AdministrationSecond Institute of OceanographyState Oceanic Administration Department of Marine Earth and Atmospheric SciencesNorth Carolina State UniversityRaleighNC 27695USA

High-resolution Chirp profiling and coring reveals an elongated （ca. 400 km） Holocene Zhujiang River （pearl River）-derived mud area （maximum thickness 〉 20 m） extending from the Zhujiang River Delta, southwest-ward off the Guangdong coast, to the Leizhou peninsula. Two depo-centers, one proximal and one distal, are identified. On the continental shelf off the west Guangdong province, the mud is deposited in water depth shallower than 50 m; while to the southeast of the Zhujiang River Estuary, the mud area can extend to the -120 m isobath. A combined analysis with the stratigraphic sequences of other muddy deposits in the West-ern pacific marginal seas （mainly Changjiang （Yangtze） and Huanghe （Yellow） Rivers derived） indicates that the initiation of the Zhujiang River muddy deposit can be further divided into two stages： Stage 1 is before the mid-Holocene sea-level highstand （ca. 7.0 cal. ka Bp）, the proximal mud was mostly deposited after 9.0 cal. ka Bp, when the sea-level rose slowly after the Meltwater pulse -1C; Stage 2, after the mid-Holocene sea-level highstand, clinoform developed on the continental shelf off the west Guangdong province, extending ca. 400 km from the Zhujiang River Estuary. The proximal clinoform thins offshore, from ca. 10 m thickness around 5-10 m water depth to less than 1-2 m around 20-30 m water depth. In addition, we also find a de-veloped distal clinoform in the east of the Leizhou peninsula.

关键词： South China Sea Zhujiang River mud clinoform

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A high-power and high-stability power supply design

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Radiation Detection Technology and Methods 2021年第2期5卷 307-313页

作者： p.liu B.Chen p.F.Wei Institute of High Energy physics Chinese Academy of SciencesBeijing 100049China

Objective BEpCII is a high-performance collider with a design energy of 2.1 GeV. In order to obtain more physical experimentsand synchrotron radiation applications, BEpCII decided to carry out energy upgrading to 2.5 GeV. Insufficient energyof special magnet power supplies in collision zone is a key factor restricting BEpCII’s operation under 2.5 GeV ***, three high-power and high-stability power supplies are designed for BEpCII energy *** The designed power supplies output part adopts high-frequency chopper modules parallel connected and adoptsdigital-analog hybrid control methods. The voltage loop regulator uses high-speed analog control, and current loop regulatoruses digital control which is based on *** The experimental data show that the output current stability of the developed power supplies is lower than50 ppm. The output current resolution is lower than 70 ppm. The developed power supplies can well meet the design requirementsof BEpCII energy upgrading.

关键词： BEpCII energy upgrading High-frequency chopper High stability Digital-analog hybrid control

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On the gating of mechanosensitive channels by fluid shear stress

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Acta Mechanica Sinica 2016年第6期32卷 1012-1022页

作者： Zhangli peng On Shun pak Zhe Feng Allen p.liu Yuan-Nan Young Department of Aerospace and Mechanical Engineering University of Notre Dame Department of Mechanical Engineering Santa Clara University Department of Mechanical Engineering University of Michigan Department of Mathematical Sciences New Jersey Institute of Technology

Mechanosensation is an important process in biological fluid-structure interaction. To understand the biophysics underlying mechanosensation, it is essential to quantify the correlation between membrane deformation, membrane tension, external fluid shear stress, and conformation of mechanosensitive (MS) channels. Smoothed dissipative particle dynamics (SDpD) simulations of vesicle/cell in three types of flow configurations are conducted to calculate the tension in lipid membrane due to fluid shear stress from the surrounding viscous flow. In combination with a simple continuum model for an MS channel, SDpD simulation results suggest that shearing adhered vesicles/cells is more effective to induce membrane tension sufficient to stretch MS channels open than a free shear flow or a constrictive channel flow. In addition, we incorporate the bilayer-cytoskeletal interaction in a two-component model to probe the effects of a cytoskeletal network on the gating of MS channels.

关键词： Fluid-lipid membrane interaction Viscous flow Mechanosensitive channels Membrane tension

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