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Convergence of FBP Algorithm for Tomography

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Acta Mathematicae Applicatae Sinica 2016年第4期32卷 963-968页

作者： gang-rong QU School of Science Beijing Jiaotong University Beijing 100044 China Beijing Center for Mathematics and Information Interdisciplinary Sciences Beijing 100048 China

Filter back-projection （FBP） algorithms are available and extensively used methods for tomogra- phy. In this paper, we prove the convergence of FBP algorithms at any continuous point of image function, in L2-norm an... 详细信息

关键词： FBP algorithm convergence window function

On a Conformally Invariant Integral Equation Involving Poisson Kernel

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Acta Mathematica Sinica,English Series 2018年第4期34卷 681-690页

作者： Jin gang XIONG School of Mathematical sciences Beijing Normal University

We study a prescribing involving Poisson kernel on the unit of PDE. As in Nirenberg problem, solutions. We prove existence in the functions problem of a conformally invariant integral equation ball. This integral equation is not the dual of any standard type there exists a Kazdan-Warner type obstruction to existence of antipodal symmetry functions class.

关键词： Poisson kernel conformal invariance blow up analysis

The Harmonic Bergman Kernels for Punctured Domains

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Acta Mathematica Sinica,English Series 2014年第11期30卷 1977-1988页

作者： Zhen gang ZHAO Department of Mathematics Capital Normal University

We obtain the explicit formulae for the harmonic Bergman kernels of Bn／{0} and Rn／Bn and study the connection between harmonic Bergman kernel and weighted harmonic Bergman *** also get the explicit formula for the w... 详细信息

关键词： Harmonic Bergman kernel harmonic Bergman weighted harmonic Bergman kernel

Mass balance of the Antarctic Ice Sheet from 2013 to 2018 estimated using the input-output method with updated remote sensing products

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Science China Earth Sciences 2023年第7期66卷 1478-1492页

作者： Yuan CHENG gang HAI Xiangbin CUI Da LV gang QIAO Rongxing LI Institute for the Conservation of Cultural Heritage School of Cultural Heritage and Information ManagementShanghai UniversityShanghai 200444China Center for Spatial Information Science and Sustainable Development Tongji UniversityShanghai 200092China College of Surveying and Geo-Informatics Tongji UniversityShanghai 200092China Polar Research Institute of China Shanghai 200136China

The Antarctic Ice Sheet(AIS)has been losing ice mass and contributing to the rise in the global sea-level(GSL)for the last 4 decades,as quantified by using satellite *** developed a framework for implementing the state-of-the-art input-output(IO)method that has the advantage of explicit estimation of the mass balance of individual glaciers,basins and the *** estimated the mass balance of the AIS from 2013 to 2018 using improved observations and updated datasets recently made available,including annual ice flow velocity maps from the Inter-mission Time Series of Land Ice Velocity and Elevation(ITS_LIVE)dataset,the Bed Machine and the Princess Elizabeth Land(PEL)Earth System Science Data(ESSD)datasets,and the surface mass balance from the RACMO 2.3 *** example,using the improved ice thickness data,the proposed method for ice discharge estimation enables a 10%reduction of uncertainty in ice *** the period of 2013–2018,an ice discharge acceleration of 6.9±6.5 Gt yr^(–2)in West Antarctica(WA)was detected,which contributed significantly to the estimated mass loss of~1069 Gt(–178.2±108.9 Gt yr^(–1))in the *** the other hand,Queen Maud Land,East Antarctica(EA),showed clearly a mass gain rate of 56.0±10.0 Gt yr^(–1)due to the regional increase in surface mass *** results extended the estimation period by 3 years in comparison to the published study using the same annual velocity maps from the ITS_LIVE ***,our results,along with those from other studies using the IO method,reassures the acceleration of recent mass loss in WA and Wilkes Land in EA,which are caused by glacier thinning and ice shelf basal *** with the long-term mass balance record since 1979,our results suggest that the mass loss in AIS accelerated in the last *** developed framework can be modified for mass balance estimation of the AIS or for other ice sheets by using velocity maps from other satellite data or from differen

关键词： Antarctic Ice Sheet Mass balance Input-output method BedMachine ITS_LIVE

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研磨处理可注射牙髓细胞外基质促进牙髓再生

中国组织工程研究 2025年第22期29卷 4663-4670页

作者：杨毓茜李文俊赵健陈岗大连医科大学附属第一医院口腔科辽宁省大连市116011

背景:可注射细胞外基质材料用于牙髓组织再生时,首先需要经过胃蛋白酶消化,再与其他基质成分如水凝胶结合使用,而这也意味着天然细胞外基质材料所保留的微环境遭到破坏。目的:探讨研磨处理条件下制备的可注射牙髓细胞外基质材料用于牙... 详细信息

背景:可注射细胞外基质材料用于牙髓组织再生时,首先需要经过胃蛋白酶消化,再与其他基质成分如水凝胶结合使用,而这也意味着天然细胞外基质材料所保留的微环境遭到破坏。目的:探讨研磨处理条件下制备的可注射牙髓细胞外基质材料用于牙髓组织再生的效果。方法:(1)将获取的猪牙来源牙髓组织经过脱细胞处理后制备成牙髓脱细胞基质材料,经过液氮冷冻、高速研磨处理后,制备成可注射牙髓细胞外基质材料,比较可注射牙髓细胞外基质材料和天然牙髓细胞外基质在细胞黏附效率和微结构方面的差异,免疫组化分析可注射牙髓细胞外基质中的细胞外基质蛋白质成分;(2)将接种有牙髓干细胞的可注射牙髓细胞外基质材料注入到牙本质基质材料构建的牙髓腔中,植入裸鼠皮下1,3,5周后取材,观察可注射牙髓细胞外基质材料的体内改建速率及其在裸鼠皮下的异位牙髓组织再生能力。结果与结论:(1)与天然牙髓细胞外基质相比,可注射牙髓细胞外基质材料显著提高了细胞黏附率,并保留了与天然牙髓细胞外基质相似的多孔胶原结构;(2)与天然牙髓细胞外基质相比,免疫组化染色显示可注射牙髓细胞外基质材料中层粘连蛋白、Ⅰ型胶原蛋白和整合素β1的表达没有显著变化,而纤连蛋白的表达显著下降;(3)体内实验显示,可注射牙髓细胞外基质材料具有优异的成血管能力,并促进了牙髓样组织的形成。结果表明,研磨处理的可注射牙髓细胞外基质材料可促进牙髓再生。

关键词：研磨人牙髓干细胞细胞外基质可注射牙髓组织再生支架材料

“劳淋病”古代中医药文献记载及现代治疗现状

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陕西中医 2025年第1期46卷 142-144,F0003页

作者：袁港龚学忠上海中医药大学附属市中医医院肾病科上海201401

“劳淋病”常因劳倦而发,迁延不愈,是临床常见难治性疾病,其现代医学病名对应的是复发性尿路感染。现代医学的主流治疗劳淋的抗生素疗法仍存在诸多局限性,中医药疗法历史悠久、潜力巨大、优势显著。本文通过整理中国古代关于淋证的记载... 详细信息

“劳淋病”常因劳倦而发,迁延不愈,是临床常见难治性疾病,其现代医学病名对应的是复发性尿路感染。现代医学的主流治疗劳淋的抗生素疗法仍存在诸多局限性,中医药疗法历史悠久、潜力巨大、优势显著。本文通过整理中国古代关于淋证的记载以及近年来中医药治疗劳淋的相关文献,从历代文献记载、现代医家对于劳淋的认识、中医验方、中医外治法等方面进行概括总结,对未来研究进行展望,以期为劳淋的临床治疗提供些许参考。

关键词：劳淋病复发性尿路感染肾虚湿热辨证论治外治法

A leakage particle-wall impingement based vibro-acoustic characterization of the leaked sand-gas pipe flow

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Particuology 2021年第2期19卷 84-93页

作者： Kai Wang Yinan Hu Min Qin gang Liu Yichen Li gang Wang School of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580China Metering Test Center China Academy of Engineering PhysicsMianyang 621900China

Solid particle leakage detection in double-wall pipes is industrially important,especially in chemical and petroleum ***,we developed vibration and acoustic sensor approaches for the characterization and comparative study of the applicability of leakage sand particle detection from the flow of gas pipes.A specific wideband vibration sensor and pressure-field microphone were selected to identify the vibro-acoustic characteristics within 50 kHz of the particle *** vibro-acoustic time-behaviours and characteristic frequencies of particle leakage were observed by the time-frequency *** leakage gas flow noise was verified by coherence analysis and minimized by a digital bandpass and band-elimination *** experiments were performed,and good agreement was found between the release pressures(0.1-0.3 MPa)with different leak sizes(0-8 mm)under different sand masses(120μm)and vibro-acoustic Root-Mean-Square(RMS)*** the comparison of the two methods,the vibration method has a better frequency response for the leakage flow and is good for identifying whether there are particle *** acoustic method has a time behaviour response and is good for establishing the relationship between the particle mass and *** addition,the acoustic method has frequency shift features with a better signal to noise *** acoustic method lays the foundation for future work of more complex leakage detection combining the advantages of vibration and the acoustic method.

关键词： Solid particle detection Vibration and acoustic Sand-gas flow Pipe leak

Intelligent CPS: features and challenges

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Science China(Information Sciences) 2016年第5期59卷 8-9页

作者： gang YANG Xingshe ZHOU School of Computer Northwestern Polytechnical University

Cyber–physical systems(CPS)have become a hot research area in the past few years[1].Existing studies focus on unified model construction,service-based design methods,integrated support tools,and verification methods in specific application areas[2–4].We designate this as CPS *** the new features and requirements from intelligent manufacturing[5],intelligent transportation,and smart grid[6],as well as the rapid development of Mobile Internet and Cloud Computing

关键词： CPS features and challenges

A Lattice Non-Perturbative Definition of an SO(10) Chiral Gauge Theory and Its Induced Standard Model

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Chinese Physics Letters 2013年第11期30卷 54-58页

作者： WEN Xiao-gang Perimeter Institute for Theoretical Physics WaterlooOntario N2L 2Y5Canada Department of Physics Massachusetts Institute of TechnologyCambridgeMassachusetts 02139USA

The standard model is a chiral gauge theory where the gauge fields couple to the right-hand and the left-hand fermions *** standard model is defined perturbatively and describes all elementary particles(except gravitons)very ***,for a long time,we do not know if we can have a non-perturbative definition of the standard model as a Hamiltonian quantum mechanical *** we propose a way to give a modified standard model(with 48 two-component Weyl fermions)a non-perturbative definition by embedding the modified standard model into an SO(10)chiral gauge *** show that the SO(10)chiral gauge theory can be put on a lattice(a 3D spatial lattice with a continuous time)if we allow fermions to *** a non-perturbatively defined standard model is a Hamiltonian quantum theory with a finite-dimensional Hilbert space for a finite space *** generally,using the defining connection between gauge anomalies and the symmetry-protected topological orders,one can show that any truly anomaly-free chiral gauge theory can be non-perturbatively defined by putting it on a lattice in the same dimension.

关键词： theory gauge chiral