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Vibration Source Number Estimation of A shell Structure

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仪器仪表学报 2013年第S1期34卷 142-146页

作者： Cheng Wei He Zhengjia Zhang Zhousuo State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong University

It has been challenging to correctly separate the mixed signals into source components when the source number is not known a *** reveal the complexity of the measured vibration signals,and provide the priori information for the blind source separation,in this paper,we propose a novel source number estimation based on independent component analysis(ICA)and clustering evaluation analysis,and then carry out experiment studies with typical mechanical vibration signals from a shell *** results demonstrate that the proposed ICA based source number estimation performs stably and robustly for the shell structure.

关键词： source number estimation source separation shell structure independent component analysis

Morphological structure of shell and expression patterns of five matrix protein genes during the shell regeneration process in Hyriopsis cumingii

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Aquaculture and Fisheries 2018年第6期3卷 225-231页

作者： Xiaojun Liu Can Jin Haoran Li Zhiyi Bai Jiale Li Key Laboratory of Freshwater Aquatic Genetic Resources Shanghai Ocean UniversityMinistry of AgricultureShanghai201306China National Demonstration Center for Experimental Fisheries Science Education Shanghai Ocean UniversityShanghai201306China Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources Ministry of EducationShanghai Ocean UniversityShanghai201306China College of Marine Science Shanghai Ocean UniversityShanghai201306China E-Institute of Shanghai Universities Shanghai Ocean UniversityShanghai201306China

shell biomineralization is a process in which inorganic minerals assemble under accuracy control of macromolecule,mainly the matrix proteins.A shell-notching assay was used in Hyriopsis cumingii and CaCO3 deposition during shell regeneration and the expression pattern of five shell matrix protein encoding genes,HcTyp-1,hic31,hic52,silkmapin and Hcperlucin were ***-and microscopic observation revealed that shell regeneration can be broadly separated into three stages.(1)The formative period of the periostracum(from 0th day to 6thday),the pellicle formed and covered the gap creating a sealed space for mineralized layer origin.(2)The period of prismatic layer mineralization(from 14 to 21 days),the periostracum continued to grow,and aragonite seeds originated from the organic membrane accumulated and grew laterally to cover the whole periostracum.(3)The growth period of the nacreous layer(from 29 to 39 days),the initial nacreous layer formed,and regular aragonite crystals deposited,nucleated and eventually grew to form a distinctive brick wall ***,the periodic high-expression of five shell matrix protein genes during periostracum formation and prismatic or nacreous layer mineralization suggested they had a dominant role in the programmed reparative *** observations contribute to understanding the molecular mechanism of shell formation.

关键词： Matrix protein shell Biomineralization Hyriopsis cumingii

Elastic deformation of ellipsoidal shell of different axis ratio under inner pressure

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Journal of Harbin Institute of Technology(New Series) 2000年第2期7卷 48-51页

作者：吴洪飞王仲仁 School of Material Science and Engineering Harbin Institute of Teclinology Harbin 150001 China

Discusses the elastic deformation of ellipsoidal shell of different axis ratio under inner pressure during hydraulic bulging forming with theoretical results in good agreement with actual result, thereby providing the... 详细信息

关键词： Ellipsoidal shell inner pressure axis ratio elastic deformation

Numerical Simulation Study on the Surface Deflection of Cylindrical Shallow shell

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武汉理工大学学报 2006年第S2期28卷 577-581页

作者： XING Zhongwen~1 BAO Jun~1 LIU Zhongyuan~1 YANG Yuying~2 SUN Zhenzhong~2 1.School of Mechanical and Electrical Engineering,Harbin Institute of Technology,Harbin 150001,China 2.School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China School of Mechanical and Electrical Engineering Harbin Institute of TechnologyHarbin 150001China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China

The increasing applications of new materials such as high strength low alloy (HSAL) steels and aluminum alloy sheets have lead to greater focus on the surface deflections of auto body panels in the automobile industry in recent *** finite element models of cylindrical shallow shell that can represent auto body panels are *** simulations of forming and unloading of cylindrical shallow shell are carried *** a measurement and evaluation method of the surface deflection is *** simulations of surface deflections with various blank homing forces (BHF) show great agreement with the experi- mental *** influence laws of sheet thickness and material properties such as yield strengthσs,strain-hardening exponent n,anisotropy parameter r and strength coefficient k on the surface deflection are achieved by simulations,which give a basic refer- ence for controlling surface deflections.

关键词： cylindrical shallow shell surface deflection numerical simulation material properties

Buckling of un-stiffened cylindrical shell under non-uniform axial compressive stress

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2002年第5期 21-32页

作者：宋昌永 DepartmentofCivilEngineering ZhejiangUniversity Hangzhou310027 China

This paper provides a review of recent research advances and trends in the area of stability of un stiffened circular cylindrical shells subjected to general non uniform axial compressive stresses. Only the more important and interesting aspects of the research, judged from a personal viewpoint, are discussed. They can be crudely classified into four categories: (1) shells subjected to non uniform loads; (2) shells on discrete supports; (3) shells with intended cutouts/holes; and (4) shells with non uniform settlements.

关键词： shell Buckling Axial compression Non uniform stress

An equivalent-boundary method for the shell analysis of buried pipelines under fault movement

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Acta Seismologica Sinica(English Edition) 2004年第Z1期17卷 150-156页

作者： LIU Ai-wen(刘爱文) HU Yu-xian(胡聿贤) ZHAO Feng-xin(赵凤新) LI Xiao-jun(李小军) Takada Shiro(高田至郎) ZHAO Lei(赵雷) Institute of Geophysics China Earthquake Administration Beijing 100081 China Institute of Geophysics China Earthquake Administration Beijing 100081 China Institute of Geophysics China Earthquake Administration Beijing 100081 China Institute of Geophysics China Earthquake Administration Beijing 100081 China Kobe University Kobe 6570013 Japan Institute of Geophysics China Earthquake Administration Beijing 100081 China

A new shell finite element method (FEM) model with an equivalent boundary is presented for estimating the re- sponse of a buried pipeline under large fault movement. The length of affected pipeline under fault movement is usually too long for a shell-mode calculation because of the limitation of memory and time of computers. In this study, only the pipeline segment near fault is modeled with plastic shell elements to study the local buckling and the large section deformation in pipe. The material property of pipe segment far away from the fault is considered as elastic, and nonlinear spring elements at equivalent boundaries are obtained and applied to two ends of shell model. Compared with the fixed-boundary shell model, the shell model with an equivalent boundary proposed by the study can remarkably reduce the needed memory and calculating time.

关键词： buried pipeline fault movement shell analysis equivalent boundary

SOLID-shell TRANSIENT ELEMENT WITH shell STRAIN-SIRESS STATE

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Chinese Journal of Aeronautics 1994年第2期7卷 118-125页

作者： Yin Zeyong Yang Zhiguo Lu Bo(Nanhua Powerplant Research Institute, Zhuzhou, China, 412002)

AbstractThe solid-shell transient elements established before will cause an unrealistic highlevel of stress because of using the wrong expression for the initial thermal strain and re-stricting Poisaon's effect of the material in the element. For solving both of the problems, anew formulation for 15-node solid-shell transient element is given by choosing the shellstrain-stress state as the strain-stress state of the transient element. The expression forthe coordinate, the displacement, the strain and stress in the local coordinate system, thestiffness matrix, and the load vector are derived in detail. The numerical examples for theturbine rotor blades of two aeroengines are given to show the effectiveness of this new kindof transient element. The result of one of the examples is compared with the correspondingexperimental result. The present technique can also be applied to other kinds of transientelements and methods dealing with solid-shell combined structures.

关键词： shell SOLID

shell下行水激冷气化炉灰水系统带渣原因及处理思路浅析

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云南化工 2023年第3期50卷 117-120页

作者：孙晓宇呼伦贝尔金新化工有限公司内蒙古呼伦贝尔021000

结合金新壳牌(shell)下行水激冷气化炉灰水系统带渣期间工况的异常变化,探讨带渣对装置稳定运行造成的影响,分析灰水系统带渣的原因,并提出相应的处理方案及调整思路,为今后的装置运行维护及优化调整提供一定的参考。

关键词： shell 下行水激冷灰水系统带渣

Negative Parity States in ^(39)Cl Configured by Crossing Major shell Orbits

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Chinese Physics Letters 2019年第6期36卷 17-20页

作者：陶龙春 Y.Ichikawa 袁岑溪 Y.Ishibashi A.Takamine A.Gladkov T.Fujita K.Asahi T.Egami C.Funayama K.Imamura 楼建玲 T.Kawaguchi S.Kojima T.Nishizaka T.Sato D.Tominaga 杨晓菲 H.Yamazaki 叶沿林 H.Ueno School of Physics and State Key Laboratory of Nuclear Physics and Technology Peking University RIKEN Nishina Center Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen University Department of Physics University of Tsukuba Department of Physics Kyungpook National University Department of Physics Osaka University Department of Physics Tokyo Institute of Technology Department of Advanced Sciences Hosei University Department of Physics Meiji University

Traditional "magic numbers" were once regarded as immutable throughout the nuclear chart. However, unexpected changes were found for unstable nuclei around N = 20. With both proton and neutron numbers around the magic number of 20, the neutron-rich ^(39)Cl isotope provides a good test case for the study of the quantumstate evolution across the major shell. In the present work, the negative parity states in ^(39)Cl are investigated through the β decay spectroscopy of 39 S. Newly observed γ transitions together with a new state are assigned into the level scheme of ^(39)Cl. The spin parity of 5/2^- for the lowest negative parity state in ^(39)Cl is reconfirmed using the combined γ transition information. These systematic observations of the negative parity states in ^(39)Cl allow a comprehensive comparison with the theoretical descriptions. The lowest 5/2^- state in ^(39)Cl remains exotic in terms of comparisons with existing theoretical calculations and with the neighboring isotopes having similar single-particle configurations. Further experimental and theoretical investigations are suggested.

关键词： Negative Parity States Crossing Major shell Orbits immutable throughout