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Bioinspired Ultra-Low Adhesive Energy Interface for Continuous 3D Printing: Reducing Curing Induced Adhesion

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Research 2018年第1期2018卷 194-200页

作者： L.Wu ZDong h.du CLi N.X.Fang Y.Song Key Laboratory of Green Printing Institute of ChemistryChinese Academy of SciencesZhongguancun North First Street 2100190 BeijingChina CAS Key Laboratory of Bio-inspired Materials and Interfacial Sciences Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Department of Mechanical Engineering Massachusetts Institute of TechnologyCambridgeMA 02139USA

Additive manufacturing based on liquid resin curing is one of the most promising methods to construct delicate ***,precision and speed are limited by the vertical adhesion of in situ cured resin at the curing *** overcome the unavoidable adhesion and to develop a general curing interface,we propose a slippery surface taking inspiration of the peristome surface of the pitcher *** surface shows ultra-low adhesive energy at the curing interface due to the inhibition of the direct contact between the cured resin and the solid surface,which also increases the reflling speed of liquid *** ultra-low adhesive energy interface is efective for continuous 3D printing and provides insights into the physical mechanisms in reducing vertical solid-solid interfacial adhesion.

关键词： curing resin interface

Tailoring grain growth and solid solution strengthening of single-phase CrCoNi medium-entropy alloys by solute selection

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Journal of Materials Science & Technology 2020年第19期54卷 196-205页

作者： G.W.hu L.C.Zeng h.du X.W.Liu Y.Wu P.Gong Z.T.Fan Q.hu E.P.George Key Laboratory of Metallurgical Equipment and Control Technology Ministry of EducationWuhan University of Science and TechnologyWuhan 430081China hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering Wuhan University of Science and TechnologyWuhan 430081China State Key Laboratory of Materials Processing and Die&Mould Technology Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China Institute of Applied Physics Jiangxi Academy of SciencesNanchang 330029China Oak Ridge National Laboratory Materials Science and Technology DivisionOak RidgeTN37831USA Department of Materials Science and Engineering University of TennesseeKnoxvilleTN37996USA

In the present study,we selected solutes to be added to the Cr Co Ni medium-entropy alloy(MEA)based on the mismatch of self-diffusion activation energy(SDQ)between the alloying elements and constituent elements of the matrix,and then investigated their grain growth behavior and mechanical *** and Al were selected as the solutes for investigation primarily because they have higher and lower SDQ,respectively,than those of the matrix elements;a secondary factor was their higher and lower shear *** concentrations were fixed at 3 at.%each because previous work had shown these compositions to be single-phase solid solutions with the face-centered cubic *** alloys were produced by arc melting,casting,homogenizing,cold rolling and annealing at various temperatures and times to produce samples with different grain *** were(a)the base alloy Cr Co Ni,(b)the base alloy plus 3 at.%Mo,and(c)the base alloy plus 3 at.%*** activation energies for grain growth of the Cr Co Ni,Cr Co Ni-3Mo and CrCo Ni-3Al MEAs were found to be^251,~368 and^219 k J/mol,respectively,consistent with the notion that elements with higher SDQ(in this study Mo)retard grain growth(likely by a solute-drag effect),whereas those with lower values(Al)accelerate grain *** roomtemperature tensile properties show that Mo increases the yield strength by^40%but Al addition has a smaller strengthening effect consistent with their relative shear *** yield strength as a function of grain size for the three single-phase MEAs follows the classical hall-Petch relationship with much higher slopes(>600 MPaμm-0.5)than traditional solid *** work shows that the grain growth kinetics and solid solution strengthening of the Cr Co Ni MEA can be tuned by selecting solute elements that have appropriate diffusion and physical properties.

关键词： Medium and high entropy alloys Solute-drag effect Microstructure Grain growth kinetics Solid solution strengthening

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EFFECT OF Ph, AMMONIA, NITRITE, PhENOL AND COPPER ON LARVAE OF ThE ChINESE STURGEON, ACIPENSER SINENSIS

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EFFECT OF PH, AMMONIA, NITRITE, PHENOL AND COPPER ON LARVAE ...

DYNAMIC ChARACTERISTICS OF BEARINGS AND PIVOTS OF hARD DISK DRIVES

第十九届国际动物学大会

作者： h.du Q.Wie J.Liu G.Tang D.Yang Y.Zhu Key Laboratory of Freshwater Fish Germplasm ＆ Biotechnology of Ministry of Agriculture Yangtze River Fisheries Research Institute Chinese Academy of Fishery Sciences Jingzhou 434000 China Key Laboratory of Freshwater Fish Germplasm ＆ Biotechnology of Ministry of Agriculture Yangtze River Fisheries Research Institute Chinese Academy of Fishery Sciences Jingzhou 434000 China Key Laboratory of Freshwater Fish Germplasm ＆ Biotechnology of Ministry of Agriculture Yangtze River Fisheries Research Institute Chinese Academy of Fishery Sciences Jingzhou 434000 China Key Laboratory of Freshwater Fish Germplasm ＆ Biotechnology of Ministry of Agriculture Yangtze River Fisheries Research Institute Chinese Academy of Fishery Sciences Jingzhou 434000 China Key Laboratory of Freshwater Fish Germplasm ＆ Biotechnology of Ministry of Agriculture Yangtze River Fisheries Research Institute Chinese Academy of Fishery Sciences Jingzhou 434000 China Key Laboratory of Freshwater Fish Germplasm ＆ Biotechnology of Ministry of Agriculture Yangtze River Fisheries Research Institute Chinese Academy of Fishery Sciences Jingzhou 434000 China

＜正＞Acute toxicities of ph, Phenol, Ammonia, Nitrite and Cu were employed to study the larvae of Chinese sturgeon Acipenser sinensis with static bioas-says. The larvae were 8-day old just before the yolk would be co...

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DYNAMIC CHARACTERISTICS OF BEARINGS AND PIVOTS OF HARD DISK ...

第五届国际振动工程会议

作者： N.Guo L.M.Xu R.M.Lin h.du C.D.Deng School of Mechanical and Production Engineering Nanyang Technological University Singapore 639798 School of Mechanical and Production Engineering Nanyang Technological University Singapore 639798 School of Mechanical and Production Engineering Nanyang Technological University Singapore 639798 School of Mechanical and Production Engineering Nanyang Technological University Singapore 639798 Nidec Singapore Pte Ltd 36 Loyang WaySingapore

＜正＞ It is known that the quasi-rigid bodymode（QR mode）vibration is one of the mainsources for generating the residual vibration insettling operation and limiting the servo bandwidth,and is mainly caused by the stiffness of the pivot,themass and structure of the head actuator *** ballbearings inside the pivot determine the pivotstiffness,which in turn,determine the effectivestiffness of the head actuator *** this paper,the stiffness-related issues among ball bearings,pivot and head actuator assembly are studiedtheoretically and *** shows that thepivot effective radial stiffness depends not only onthe stiffness of the ball bearing but also on theconnection method used to attach the pivot to thehead actuator *** is also shown from themeasurement and analysis that the resonancefrequency of the QR mode,determined by the pivoteffective radial stiffness and inherent properties ofthe head actuator arm,can be moved to a higherfrequency by using a more rigid pivot and a morestiff joint.

关键词： ball bearing pivot stiffness natural frequency hard disk drive

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超导薄膜磁场穿透深度的精确测量

低温物理学报 1999年第4期21卷 70-73页

作者：王瑞峰赵士平陈赓华杜寰徐凤枝杨乾声中科院物理所凝聚态物理中心

磁场穿透深度λ是超导体的一个基本参数，目前，一般测试穿透深度的实验只能给出其变化量Δλ＝λ（Ｔ）－λ（０），而不能得到λ的绝对值．并且由于测量精度的限制，用给定的理论模型拟合实验结果而得到的λ也有很大的不确定性．本文... 详细信息

磁场穿透深度λ是超导体的一个基本参数，目前，一般测试穿透深度的实验只能给出其变化量Δλ＝λ（Ｔ）－λ（０），而不能得到λ的绝对值．并且由于测量精度的限制，用给定的理论模型拟合实验结果而得到的λ也有很大的不确定性．本文对此进行了详细的分析，并用双线圈互感法研究了超导薄膜穿透深度的精确测量，并给出了磁控溅射Ｎｂ膜的测量结果．我们的研究表明，这一方法能较为准确地给出λ的绝对值，从而避免了以往的测量及拟合所导致的不确定性．基于ＢＣＳ理论并考虑样品有限的电子平均自由程后，理论计算结果与我们的测量结果吻合较好

关键词：铌膜超导体磁场穿透深度超导薄膜理论模型绝对值精确测量

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超导薄膜的磁场穿透深度的测量

低温物理学报 1999年第1期21卷 46+48+47+49-50页

作者：王瑞峰赵士平陈赓华杜寰徐凤枝杨乾声中国科学院物理研究所凝聚态物理中心

我们设计和研究了用于测量超导薄膜穿透深度的双线圈互感装置，用数值模拟的方法对线圈及其位形进行了优化．对磁控溅射制备的不同厚度的铌膜在不同温度下的测量结果表明，我们的设计大大提高了实验的准确性和稳定性，并得到了理论预期... 详细信息

我们设计和研究了用于测量超导薄膜穿透深度的双线圈互感装置，用数值模拟的方法对线圈及其位形进行了优化．对磁控溅射制备的不同厚度的铌膜在不同温度下的测量结果表明，我们的设计大大提高了实验的准确性和稳定性，并得到了理论预期的随膜厚和温度的变化关系

关键词：超导薄膜不同温度不同厚度磁控溅射磁场穿透深度铌膜

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全铌隧道结dc SQUID的制备和研究

低温物理学报 1999年第1期21卷 2-5页

作者：杜寰赵士平王瑞峰徐凤枝王晶陈赓华杨乾声中科院物理研究所凝聚态物理中心

本文用磁控溅射方法研究了全铌隧道结ｄｃＳＱＵＩＤ的制备．根据铌结的ＳｔｅｗａｒｔＭｃＣｕｍｂｅｒ参量βｃ选择确定结的并联电阻，消除了结的回滞，并联电阻后的ＩＶ曲线很好的符合ＲＳＪ模型．为了获得大的磁通电压调制幅度... 详细信息

本文用磁控溅射方法研究了全铌隧道结ｄｃＳＱＵＩＤ的制备．根据铌结的ＳｔｅｗａｒｔＭｃＣｕｍｂｅｒ参量βｃ选择确定结的并联电阻，消除了结的回滞，并联电阻后的ＩＶ曲线很好的符合ＲＳＪ模型．为了获得大的磁通电压调制幅度，设计了较小的ＳＱＵＩＤ环孔，环孔电感为Ｌ～２５ｐＨ．由此制备的ＳＱＵＩＤ具有传输函数（Ｖ／Φｅ）Ｉｂ～１．４ｍＶ／Φ０，其本征能量分辨率达～２４ｈ．

关键词：隧道结半导体结并联电阻 dc SQUID 传输函数能量分辨率临界电流量子干涉效应

Enantio-divergent C–h borylation with two different ligands from a single chiral source

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Science China Chemistry 2025年第1期 226-232页

作者： Rongrong du Senmiao Xu State Key Laboratory for Oxo Synthesis and Selective Oxidation Lanzhou Institute of Chemical Physics Chinese Academy of Sciences College of Material Chemistry and Chemical Engineering Key Laboratory of Organosilicon Chemistry and Material TechnologyMinistry of Education Hangzhou Normal University University of Chinese Academy of Sciences

Reported here is an iridium-catalyzed enantio-divergent C（sp3）–h borylation of α-gem-dimethyl groups of trifluoromethyl ketone-derived hydrazones to construct a series of acyclic all-carbon quaternary stereocenters with a high level of chiral induction. Two different chiral bidentate boryl ligands from a common chiral source not only can switch the enantioselectivity but also are complementary in terms of the substrate scope.

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大量慢性乙型肝炎病人手术标本肝纤维化分期中肝脏硬度值与血清生物学标志物的研究

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国际医学放射学杂志 2016年第5期 568-568页

作者： L.Qiang L.Changli L.Jiawu L.Wenwu Q.Xiaoying h.du 张丹青 Department of Ultrasound West China Hospital of Sichuan University

摘要目的以大量手术样本病理所见为参照标准,研究肝脏硬度值和血清生物学标志物对慢性乙型肝炎(ChB)病人肝脏纤维化分期的价值。材料与方法本研究获得伦理委员会批准,所有病人均签署知情同意书。收集386例ChB病人的肝脏硬度值(通过超声... 详细信息

摘要目的以大量手术样本病理所见为参照标准,研究肝脏硬度值和血清生物学标志物对慢性乙型肝炎(ChB)病人肝脏纤维化分期的价值。材料与方法本研究获得伦理委员会批准,所有病人均签署知情同意书。收集386例ChB病人的肝脏硬度值(通过超声弹性成像点定量方法测定)、天门

关键词：硬度值慢性乙型肝炎肝脏肝纤维化肝疾病生物学标志物血清标志物手术标本病人