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活塞式液体灌装系统精度试验研究

武汉理工大学学报（信息与管理工程版） 2013年第4期35卷 539-542页

作者：吴波向康杨金江苟利军吴迪武汉理工大学机电工程学院湖北武汉430070

试验研究了活塞泵内气体量、灌装液料和灌液速度方案对活塞式液体灌装系统灌装精度的影响及提高灌装精度的相应方法,并采用精度补偿的方法对系统固有特性与灌装液料引起的误差进行了有效补偿。试验结果对活塞式高精度液体灌装机的研发... 详细信息

试验研究了活塞泵内气体量、灌装液料和灌液速度方案对活塞式液体灌装系统灌装精度的影响及提高灌装精度的相应方法,并采用精度补偿的方法对系统固有特性与灌装液料引起的误差进行了有效补偿。试验结果对活塞式高精度液体灌装机的研发与调试提供了技术支持,具有一定参考意义。

关键词：活塞式液体灌装精度试验

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X射线双星系统的探测

中国科学：物理学、力学、天文学 2018年第3期48卷 83-89页

作者：苟利军董燕婷王仲翔李向东刘继锋刘碧芳袁峰张澍鄢淑平李立新袁业飞顾为民中国科学院国家天文台北京100012 中国科学院大学天文和空间学院北京100049 中国科学院上海天文台上海200030 南京大学天文与空间学院南京210093 中国科学院高能物理研究所北京100049 中国科学院紫金山天文台南京210008 北京大学科维理天文与天体物理研究所北京100871 中国科学技术大学天文系合肥230026 厦门大学天文系厦门361005

搜寻X射线双星并建立大规模样本是解决众多科学问题(如"银河系中有多少黑洞X射线双星?黑洞和中子星之间有无质量间隙?球状星团中有无黑洞?"等)的基础.爱因斯坦探针卫星拥有更灵敏的探测能力,将在运行的几年之中,预计可以发现一批新的中... 详细信息

搜寻X射线双星并建立大规模样本是解决众多科学问题(如"银河系中有多少黑洞X射线双星?黑洞和中子星之间有无质量间隙?球状星团中有无黑洞?"等)的基础.爱因斯坦探针卫星拥有更灵敏的探测能力,将在运行的几年之中,预计可以发现一批新的中子星和黑洞X射线双星,研究其空间和动力学质量分布成为解决上述问题的关键.

关键词：黑洞中子星双星系统 X射线

Towards ultrastrong and ductile medium-entropy alloy through dual-phase ultrafine-grained architecture

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Journal of Materials Science & Technology 2022年第31期126卷 228-236页

作者： Zhen Chen Hongbo Xie Haile Yan Xueyong Pang Yuhui Wang Guilin Wu lijun Zhang Hu Tang Bo Gao Bo Yang Yanzhong Tian Huiyang gou Gaowu Qin Center for High Pressure Science&Technology Advanced Research(Beijing) Beijing 100094China Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan UniversityQinhuangdao 066004China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China School of Materials and Engineering Shandong University of Science and TechnologyQingdao 266590China Instrumental Analysis Center Taiyuan University of Science and TechnologyTaiyuan 030024China

Advanced materials with superior comprehensive mechanical properties are strongly desired,but it has long been a challenge to achieve high ductility in high-strength ***,we proposed a new V 0.5 Cr 0.5 CoNi medium-entropy alloy(MEA)with a face-centered cubic/hexagonal close-packed(FCC/HCP)dual-phase ultrafine-grained(UFG)architecture containing stacking faults(SFs)and local chemical order(LCO)in HCP solid solution,to obtain an ultrahigh yield strength of 1476 MPa and uniform elongation of 13.2%at ambient *** ultrahigh yield strength originates mainly from fine grain strength-ening of the UFG FCC matrix and HCP second-phase strengthening assisted by the SFs and LCO inside,whereas the large ductility correlates to the superior ability of the UFG FCC matrix to storage disloca-tions and the function of deformation-induced SFs in the vicinity of the FCC/HCP boundary to eliminate the stress *** work provides new guidance by engineering novel composition and stable UFG structure for upgrading the mechanical properties of metallic materials.

关键词： Medium-entropy alloy FCC/HCP dual-phase Strength and ductility Ultrafine-grained(UFG) Multiple hardening mechanisms

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胰腺实性假乳头状瘤的超声及CT表现

医学影像学杂志 2018年第9期28卷 1482-1484,1488页

作者：李杨余进洪陈莉李兵张川陈丽君苟凌云刘晓玲川北医学院附属医院放射科四川南充637000 川北医学院附属医院超声科四川南充637000

目的分析胰腺实性假乳头状瘤(SPTP)的超声及CT表现。方法回顾性分析经手术病理学检查证实的11例胰腺实性假乳头状瘤的影像资料,11例均接受超声检查,8例同时行CT扫描。结果超声显示6例呈囊实性,含纤维包膜,与周围正常胰腺分解清楚; 5例... 详细信息

目的分析胰腺实性假乳头状瘤(SPTP)的超声及CT表现。方法回顾性分析经手术病理学检查证实的11例胰腺实性假乳头状瘤的影像资料,11例均接受超声检查,8例同时行CT扫描。结果超声显示6例呈囊实性,含纤维包膜,与周围正常胰腺分解清楚; 5例呈实性,无包膜; 4例显示钙化;多普勒超声显示4例有少量至中量血流。同时行CT检查的患者,CT平扫显示5例为囊实性混杂密度肿块,3例为实性,2例显示钙化,动脉期实性部分呈现轻度强化,静脉期及延迟期实性部分、壁结节及包膜进一步强化,囊性部分无强化。结论胰腺实性假乳头状瘤的超声及CT表现具有一定的特征性,熟悉这些影像表现有助于准确诊断。

关键词：胰腺实性假乳头状瘤多普勒超声体层摄影术,X线计算机

Mechanically strong porous bioceramic tubes facilitate large segmental bone defect repair by providing long-term structurally stability and promoting osteogenesis

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Engineered Regeneration 2024年第1期5卷 1-10页

作者： lijun Xie Jiahao Zhang Hangxiang Sun Zehao Chen Wangsiyuan Teng Xupeng Chai Cong Wang Xianyan Yang Yifan Li Sanzhong Xu Zhongru gou Zhaoming Ye Department of Orthopedic Surgery the Second Affiliated HospitalZhejiang University School of MedicineHangzhou 310000PR China Orthopedics Research Institute of Zhejiang University Hangzhou 310000PR China Key Laboratory of Motor System Disease Research and Precision Therapy of Zhejiang Province Hangzhou 310000PR China Bio-nanomaterials and Regenerative Medicine Research Division Zhejiang-California International Nanosystem InstituteZhejiang UniversityHangzhou 310058PR China Department of Orthopedics the First Affiliated HospitalZhejiang University School of MedicineHangzhou 310003PR China

Mechanically strong magnesium-doped Ca-silicate bioceramic scaffolds have many advantages in repairing large segmental bone *** we combine β-TCP with 6 mol%magnesium-doped calcium silicate(Mg6)at three different ratios(TCP,TCP+15%Mg6,TCP+85%Mg6)to find an appropriate ratio which can exert considerable influence on bone *** this study,the bioceramic scaffolds were assessed for mechanical strength,bioactive ion release,biocompatibility,and osteogenic capacity through in vitro ***,the potential for promoting bone regeneration was investigated through in vivo implantation of porous tube-like *** results showed that the compressive strength increased with the augmentation of Mg6 *** the compressive strength of the TCP+85%Mg6 group reached 38.1±3.8 MPa,three times that of the other two ***,extensive in vivo investigations revealed that the TCP+85%Mg6 bioceramic scaffolds were particularly beneficial for the osteogenic capacity of critical-sized femoral defects(20 mm in length).Altogether,magnesium doping in bioceramic implants is a promising strategy to provide stronger mechanical support and enhance osteogenesis to accelerate the repair of large defects.

关键词： Bioceramic tubes Mg-doped calcium silicate Porous structural stability Large segmental bone defects Digital light processing

Accretion in strong field gravity with eXTP

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Science China(Physics,Mechanics & Astronomy) 2019年第2期62卷 45-73页

作者： Alessandra De Rosa Phil Uttley lijun gou Yuan Liu Cosimo Bambi Didier Barret Tomaso Belloni Emanuele Berti Stefano Bianchi Ilaria Caiazzo Piergiorgio Casella Marco Feroci Valeria Ferrari Leonardo Gualtieri Jeremy Heyl Adam Ingram Vladimir Karas FangJun Lu Bin Luo Giorgio Matt Sara Motta Joseph Neilsen Paolo Pani Andrea Santangelo XinWen Shu JunFeng Wang Jian-Min Wang YongQuan Xue YuPeng Xu WeiMin Yuan YeFei Yuan Shuang-Nan Zhang Shu Zhang Ivan Agudo Lorenzo Amati Nils Andersson Cristina Baglio Pavel Bakala Altan Baykal Sudip Bhattacharyya Ignazio Bombaci NiccolóBucciantini Fiamma Capitanio Riccardo Ciolfi Wei K.Cui Filippo D'Ammando Thomas Dauser Melania Del Santo Barbara De Marco Tiziana Di Salvo Chris Done Michal Dovciak Andrew C.Fabian Maurizio Falanga Angelo Francesco Gambino Bruce Gendre Victoria Grinberg Alexander Heger Jeroen Homan Rosario Iaria JiaChen Jiang ChiChuan Jin Elmar Koerding Manu Linares Zhu Liu Thomas J.Maccarone Julien Malzac Antonios Manousakis Frédéric Marin Andea Marinucci Missagh Mehdipour Mariano Méndez Simone Migliari Cole Miller Giovanni Miniutti Emanuele Nardini Paul T.O'Brien Julian P.Osborne Pierre Olivier Petrucci Andrea Possenti Alessandro Riggio Jerome Rodriguez Andrea Sanna LiJing Shao Malgosia Sobolewska Eva Sramkova Abigail L.Stevens Holger Stiele Giulia Stratta Zdenek Stuchlik Jiri Svoboda Fabrizio Tamburini Thomas M.Tauris Francesco Tombesi Gabriel Torok Martin Urbanec Frederic Vincent QingWen Wu Feng Yuan Jean J.M.in't Zand Andrzej A.Zdziarski XinLin Zhou INAF-Istituto di Astrofisica e Planetologie Spaziali Via Fosso del Cavaliere Anton Pannekoek Institute for Astronomy University of Amsterdam National Astronomical Observatories Chinese Academy of Science Institute of High Energy Physics Chinese Academy of Science Center for Field Theory and Particle Physics and Department of Physics Fudan University IRAP Universitéde ToulouseCNRSUPSCNES INAF-Osservatorio Astronomico di Brera Department of Physics and Astronomy The University of MississippiUniversity Dipartimento di Matematica e Fisica Universitàdegli studi Roma Tre University of British Columbia INAF-Osservatorio Astronomico di Roma INFN-Roma 2 c/o Dipartimento di Fisica II Universit?di Roma"Tor Vergata" Dipartimento di Fisica Universitàdegli Studi di Roma"La Sapienza"&Sezione INFN Roma1 Department of Physics University of OxfordClarendon Laboratory Astronomical Institute Academy of Sciences School of Astronomy and Space Science Nanjing University MIT Kavli Institute for Astrophysics and Space Research Institut für Astronomie und Astrophysik Eberhard Karls Universität Department of Physics Anhui Normal University Department of Astronomy and Institute of Theoretical Physics and Astrophysics Xiamen University CAS Key Laboratory for Research in Galaxies and Cosmology Department of AstronomyUniversity of Science and Technology of China Instituto de Astrofísica de Andalucia(CSIC) Glorieta de la Astronomía s/n INAF-Istituto di Astrofisica Spaziale e Fisica cosmica di Bologna Mathematical Sciences and STAG Research Centre University of Southampton New York University Abu Dhabi Institute of Physics and Research Centre for Computational Physics and Data Processing Faculty of Philosophy&ScienceSilesian University in OpavaíBezru?ovo nám. Department of Physics Middle East Technical University Department of Astronomy and Astrophysics Tata Institute of Fundamental Research Dipartimento di Fisica Universit?di Pisa&INFN INAF-Osservatorio Astrofisico di Arcetri INAF-Osservatorio Astronomico di Padova INFN-TIFPA Trento Ins

In this paper we describe the potential of the enhanced X-ray Timing and Polarimetry(eXTP) mission for studies related to accretion flows in the strong field gravity regime around both stellar-mass and supermassive black-holes. eXTP has the unique capability of using advanced "spectral-timing-polarimetry" techniques to analyze the rapid variations with three orthogonal diagnostics of the flow and its geometry, yielding unprecedented insight into the inner accreting regions, the effects of strong field gravity on the material within them and the powerful outflows which are driven by the accretion process.

关键词： X-ray black holes physics accretion

亚东地区高喜马拉雅结晶岩系部分熔融的时限:来自乃堆拉混合岩锆石U-Pb年代学的约束

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地球科学 2020年第8期45卷 2894-2904页

作者：苟正彬刘函段瑶瑶李俊张士贞中国地质调查局成都地质调查中心成都610081

高喜马拉雅结晶岩系由中-高级变质岩和淡色花岗岩组成,是研究喜马拉雅造山带形成与演化的天然实验室.高喜马拉雅结晶岩系混合岩和淡色花岗岩中锆石和独居石的定年结果往往是分散的,对这些定年结果的解释还存在争议,严重制约了对高喜马... 详细信息

高喜马拉雅结晶岩系由中-高级变质岩和淡色花岗岩组成,是研究喜马拉雅造山带形成与演化的天然实验室.高喜马拉雅结晶岩系混合岩和淡色花岗岩中锆石和独居石的定年结果往往是分散的,对这些定年结果的解释还存在争议,严重制约了对高喜马拉雅结晶岩系变质、部分熔融作用的起始时间和持续过程的理解.对造山带中段亚东地区高喜马拉雅结晶岩系上部构造层位的乃堆拉混合岩进行了锆石U-Pb年代学研究.研究结果显示,乃堆拉混合岩暗色体给出了29.1~24.7 Ma的进变质和部分熔融的时间,混合岩浅色体获得了25.0~13.7 Ma的退变质和熔体结晶的时间,表明亚东地区高喜马拉雅结晶岩系的部分熔融作用大约开始于30 Ma并持续到13 Ma,暗示它是一个长期、持续的过程.亚东地区高喜马拉雅结晶岩系发生部分熔融的时间明显早于藏南拆离系和主中央断裂开始活动的时间,部分熔融可能在高喜马拉雅结晶岩系俯冲过程中就已经发生了.相关成果为建立造山带构造演化模型提供了新信息.

关键词：高喜马拉雅结晶岩系部分熔融持续过程混合岩锆石U-Pb 地质年代学

六方氮化硼/环氧树脂复合材料热力学性能的分子动力学模拟

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高电压技术 2022年第4期48卷 1471-1479页

作者：郭蕾丁诗林袁帅勾小凤王路伽周利军西南交通大学电气工程学院成都611756 中国矿业大学电气与动力工程学院徐州221116

为了从微观角度分析六方氮化硼(h-BN)掺杂对环氧树脂(epoxy,EP)热力学性能的影响,以双酚A二缩水甘油醚和4,4’—二氨基二苯砜分别作为环氧树脂基体和固化剂,采用分子动力学的方法,研究分析h-BN改性环氧树脂材料在250~450K温度范围内改... 详细信息

为了从微观角度分析六方氮化硼(h-BN)掺杂对环氧树脂(epoxy,EP)热力学性能的影响,以双酚A二缩水甘油醚和4,4’—二氨基二苯砜分别作为环氧树脂基体和固化剂,采用分子动力学的方法,研究分析h-BN改性环氧树脂材料在250~450K温度范围内改性前后的热力学性能及微观结构参数变化。研究发现,在环氧树脂中加入h-BN可以提高环氧树脂材料的热导率、玻璃化转变温度、杨氏模量和剪切模量,减小热膨胀系数,达到改善环氧树脂导热性能、热学性能以及力学性能的目的。温度升高会提高环氧树脂及h-BN/EP复合材料的热导率,但升温对纯环氧树脂的热导率影响更大。同时,温度升高使环氧树脂和h-BN/EP复合材料的力学性能变差,但在干式车载牵引变压器的温升范围内h-BN/EP复合材料力学性能始终优于纯环氧树脂。在微观结构参数上,加入h-BN以后环氧树脂的均方位移明显更低,且随着温度升高h-BN/EP模型相比于EP模型的自由体积分布更不容易变得分散,表明h-BN的加入会阻碍环氧树脂分子链的运动。

关键词：环氧树脂 h-BN改性热导率热力学性能分子动力学模拟

新型N,O-配位吡啶氟硼化合物的合成及其光谱性质

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有机化学 2017年第3期37卷 704-710页

作者：吴云英苟高章伍贤学杨丽君傅文甫玉溪师范学院资源环境学院化学系玉溪653100 红河学院理学院理学院化学系蒙自661199 中国科学院理化技术研究所北京100190

以2-氨基吡啶衍生物为原料,通过简单而高效的两步反应合成了6个新型N,O-配位吡啶氟硼化合物2a^2f,其结构经~1H(^(13)C、^(19)F)NMR,ESI-MS,IR和X单晶衍射分析表征,并对其光谱性质进行实验和理论计算研究.结果表明,苯环(或吡啶环)上含给... 详细信息

以2-氨基吡啶衍生物为原料,通过简单而高效的两步反应合成了6个新型N,O-配位吡啶氟硼化合物2a^2f,其结构经~1H(^(13)C、^(19)F)NMR,ESI-MS,IR和X单晶衍射分析表征,并对其光谱性质进行实验和理论计算研究.结果表明,苯环(或吡啶环)上含给电子基的化合物2b,2c,2e,2f的最大吸收峰位于360~420 nm(λ_(abs)=368,400,365,418 nm),且具有较大的摩尔吸光系数(ε=28760,51980,25250,40750 L·mol^(-1)·cm^(-1)).明显不同的是,苯环对位无取代基的化合物2a和含吸电子基的化合物2d的最大吸收峰分别为340和337 nm.同时,化合物2b,2c,2e,2f具有一定的溶剂效应,随着溶剂极性的增加,发射光谱红移且荧光强度降低,说明这些化合物中存在着一定的分子内电荷转移(ICT)效应.此外,实验结果和理论计算验证了化合物2b,2c,2e,2f中存在ICT,并揭示了取代基对化合物的光谱性质具有显著影响.希望通过这些研究可为进一步发展ICT-型荧光染料及其应用打下良好基础.

关键词： N,O-配位吡啶氟硼化合物分子内电荷转移光谱性质