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STUDY ON AN OBJECT-ORIENTED FEATURE-BASED CAD OF HYDRAULIC MANIFOLD BLOCK

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Chinese Journal of Mechanical Engineering 2000年第3期13卷 206-211页

作者： Wang Rongliang ye bing Qu Junsheng 浙江大学流体传动及控制国家重点实验室浙江杭州

The technique of object-oriented feature-based solid modeling andits application in the CAD of hydraulic manifold block (HMB) arediscussed. The research can greatly improve the convenience andefficiency of product des... 详细信息

关键词： CAD STUDY ON AN OBJECT-ORIENTED FEATURE-BASED CAD OF HYDRAULIC MANIFOLD BLOCK ACIS

FUZZY ECCENTRICITY AND GROSS ERROR IDENTIFICATION

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Chinese Journal of Mechanical Engineering 2006年第1期19卷 143-145页

作者： ye bing FEI yetai LIAO Benqiang School of Science Hefei University of Technology Hefei 230009 China School of Instrumentation Hefei University of Technology Hefei 230009 China

The dominant and recessive effect made by exceptional interferer is analyzed in measurement system based on responsive character, and the gross error model of fuzzy clustering based on fuzzy relation and fuzzy equipollance relation is built. The concept and calculate formula of fuzzy eccentricity are defined to deduce the evaluation rule and function ofgruss error, on the base of them, a fuzzy clustering method of separating and discriminating the gross error is found, utilized in the dynamic circular division measurement system, the method can identify and eliminate gross error in measured data, and reduce measured data dispersity. Experimental results indicate that the use of the method and model enables repetitive precision of the system to improve 80% higher than the foregoing system, to reach 3.5 s, and angle measurement error is less than 7 s.

关键词： Fuzzy clustering Gross error model Fuzzy eccentricity Repetitive precision improvement

Transcriptional regulators that differentially control dendrite and axon development

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Frontiers in Biology 2012年第4期7卷 292-296页

作者： Xin WANG bing ye Life Sciences Institute University of Michigan Ann Arbor MI 48109 USA Department of Cell and Developmental Biology University of Michigan Ann Arbor MI 48109 USA Department of Molecular Cellular and Developmental Biology University of Michigan Ann Arbor MI 48109 USA

Neurons are the basic units of connectivity in the nervous system. As a signature feature, neurons form polarized structures： dendrites and axons, which integrate either sensory stimuli or inputs from upstream neurons and send outputs to target cells, respectively. The separation of dendritic and axonal compartments is achieved in two steps during development： 1） dendrite and axon specification： how neurites are initially specified as dendrites and axons; and 2） dendrite and axon commitment： how dendrites and axons are committed to distinct compartmental fates and architectures. To understand neural circuit assembly and to correct erroneous dendrite or axon growth in a compartment-specific manner, it is essential to understand the regulatory mechanisms underlying dendrite and axon commitment. Compared to extensive studies on dendrite and axon specification, little is known about the molecular mechanisms exclusively dedicated to dendrite or axon commitment. Recent studies have uncovered the requirement of transcriptional regulation in this process. Here, we review the studies on transcriptional regulators： Darl, p300-SnoN, NeuroD, which have been shown to separate dendrite- and axon-specific growth of the same neuron type after compartmental fates are specified.

关键词： dendrite and axon commitment Darl p300-SnoN NeuroD

Friction and wear behavior of Mg–11Y–5Gd–2Zn–0.5Zr(wt%)alloy with oil lubricant

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Rare Metals 2013年第5期32卷 453-458页

作者： Li-Jie Cao Qu-Dong Wang Yu-Juan Wu bing ye College of Mechanical Engineering Shanghai University of Engineering Science National Engineering Research Center of Light Alloy Net Forming Shanghai Jiao Tong University

The sliding friction and wear behaviors of Mg-11Y-5Gd-2Zn-0.5Zr （wt%） alloy were investigated under oil lubricant condition by pin-on-disk configuration with a constant sliding distance of 1,000 m in the temperature range of 25-200℃. Results indicate that the volumetric wear rates and average friction coefficients decrease with the increase of sliding speeds, and increase with the increase of test temperature below 150℃. The hard and thermally stable Mg12（Y,Gd）Zn phase with long-period stacking order structure in the alloy presents significant wear resistance, The wear mechanism below 100℃ is abrasive wear as a result of plastic extrusion deformation. The corporate effects of severe abrasive, oxidative, and delaminating wear result in the tribological mechanism above 100℃.

关键词： Mg-11Y-5Gd-2Zn-0.5Zr alloy Long-period stacking order (LPSO) structure Lubricated Friction and wear

Further Understanding on the Three Domains of Isotactic Polypropylene by Investigating the Crystalline Morphologies Evolution after Treatment at Different Domains

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Chinese Journal of Polymer Science 2016年第3期34卷 344-358页

作者： ding-ding hu shi-bing ye fei yu 冯嘉春 State Key Laboratory of Molecular Engineering of Polymers Collaborative Innovation Center of Polymers and Polymer Composite Materials Department of Macromoleeular Science Fudan University Shanghai 200433 China

The introduction of concept of the three domains of isotactic polypropylene（iPP） by Wittmann and Lotz et al. is an important advance in understanding the influence of the melt structures on the crystallization behaviors and consequent properties. To further understand the physical nature of the melt structures, the crystalline structures of i PP after thermal treatment in the three domains are systematically investigated. It is found that after treated at different domains the crystal morphologies, including the sizes and birefringence of spherulitic, the proportion of radial and tangential lamellae, etc., have distinctly different features. Our study reveals that the ＂nuclei＂ at domain II compose of locally ordered chains and the induced memory effect could not be erased under annealing treatment, while the ＂nuclei＂ at domain III compose of crystal fragments, which will aggregate under annealing process. Based on our results, highly schematic diagrams are proposed to illustrate the probable physical characteristics of the melt structures at the three different domains.

关键词： Polypropylene Self-nucleating Annealing Crystallization morphology

Detection of pesticides on navel orange skin by surface-enhanced Raman spectroscopy coupled with Ag nanostructures

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International Journal of Agricultural and Biological Engineering 2016年第2期9卷 179-185页

作者： Liu Yande Zhang Yuxiang Wang Haiyang ye bing Institute of Optics-Mechanics-Electronics Technology and Application East China Jiaotong UniversityNanchang 330013China

Residual pesticides such as phosmet and chlorpyrifos in fruit have become a public concern problem in recent *** this study,surface-enhanced Raman spectroscopy(SERS)was used to detect and characterize pesticides extracted from navel orange *** colloid was prepared for getting the SERS of phosmet and *** Raman signals of phosmet over a concentration range of 5 mg/L to 30 mg/L and chlorpyrifos over a concentration range of 5 mg/L to 20 mg/L were *** least squares(PLS)regression combined with different data preprocessing methods was used to develop quantitative *** the second derivative data preprocessing,the best prediction model of phosmet pesticide was achieved with a correlation coefficient(r)of 0.852 and the root mean square error of prediction(RMSEP)of 5.177 mg/*** best prediction model of chlorpyrifos pesticide was achieved with r of 0.843 and the RMSEP of 2.992 mg/L using the multiplicative scatter correction(MSC)and first derivative data *** study indicated that SERS coupled with Ag nanostructures is a potential tool for analysis of phosmet and chlorpyrifos pesticide residues.

关键词： pesticides residues detection silver colloid surface enhanced Raman spectroscopy navel orange food safety

Microstructure, tensile properties and creep behavior of Al-12Si-3.5Cu-2Ni-0.8Mg alloy produced by different casting technologies

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Journal of Materials Science & Technology 2018年第7期34卷 1222-1228页

作者： Lijie Zuo bing ye Jian Feng Xiangyang Kong Haiyan Jiang Wenjiang Ding National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai 200240 China Institute of Materials for Mobile Energy School of Materials Sdence and Engineering ShanghaiJiao Tong University Shanghai 200240 China

The relationship between the as-cast microstructure and mechanical properties of the ***- 2Ni-0.8Mg alloys produced by permanent mold casting （PMC） and high pressure die casting （HPDC） is investigated. The alloys in both PMC and HPDC consist of Al, Si, A15 Cu2 MgsSi6, Al3 CuNi, and Al Cu4Ni phase. However, the microstructure of the HPDC alloy is significantly refined. Compared to the PMC alloy, the ultimate tensile strength of the HPDC alloy is significantly increased from 244 MPa to 310 MPa, while the elongation shows a reverse trend at room temperature. At low stress and temperature range, slight variations of stress exponent and activation energy indicate that the minimum creep rate is controlled by the grain boundary creep. Then the minimum creep rate is higher for the specimen with the smaller grain size, where grain boundary creep is the dominant creep mechanism. At high stress region, the stress exponent for the PMC alloy and HPDC alloy is 5.18 and 3.07, respectively. The different stress exponents and activation energies measured at high stress and high temperature range indicates that the creep mechanism varies with the casting technologies.2017 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science ＆ Technology.

关键词： Microstructure Tensile properties CreepHigh pressure die casting

The role of Down syndrome cell adhesion molecule in Down syndrome

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Medical Review 2024年第1期4卷 31-41页

作者： Ty Hergenreder Tao Yang bing ye Life Sciences Institute and Department of Cell and Developmental Biology University of MichiganAnn ArborMIUSA Life Sciences Institute and Department of Cell and Developmental Biology University of Michigan210 Washtenaw AvenueRoom 5403Ann ArborMI48109USA

Down syndrome(DS)is caused by the presence of an extra copy of the entire or a portion of human chromosome 21(HSA21).This genomic alteration leads to elevated expression of numerous HSA21 genes,resulting in a variety of health issues in individuals with *** the genes located in the DS“critical region”of HSA21,Down syndrome cell adhesion molecule(DSCAM)plays an important role in neuronal *** is a growing body of evidence underscoring DSCAM’s involvement in various DS-related *** review aims to provide a concise overview of the established functions of DSCAM,with a particular focus on its implications in *** delve into the roles that DSCAM plays in DS-associated *** the concluding section of this review,we explore prospective avenues for future research to further unravel DSCAM’s role in DS and opportunities for therapeutic treatments.

关键词： Down syndrome DSCAM neuron axon GABAergic synapse

Effect of homogenization on the microstructure and mechanical properties of the repetitive-upsetting processed AZ91D alloy

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Journal of Materials Science & Technology 2017年第9期33卷 935-940页

作者： Li Zhang Qudong Wang Wenjun Liao Wei Guo bing ye Haiyan Jiang Wenjiang Ding National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University

The current research investigates the effect of homogenization on the microstructure and mechanical properties of the AZ91 D alloy processed by repetitive upsetting（RU）. Results show that during RU processing, the initial large Mg;Al;particles in the as-cast specimen accelerate the dynamic recrystallization（DRX） due to the particle stimulating nucleation（PSN） mechanism. With the progress of RU,the inherent large strain breaks the large second phases into small fragments, which indicates the PSN gradually disappears, while the pinning effect becomes obvious. As for the homogenized specimen, a pre-heat treatment leads to the absence of Mg;Al;particles but a uniform distribution of Al atoms in the Mg alloy. Though the subsequent RU promotes the precipitation of Mg;Al;particles, the relatively small particle size and the uniform distribution are more favorable to act as obstacles for grain growth than contributors to PSN. Finally, a more homogeneous and refined microstructure is obtained in the specimen with prior homogenization than the as-cast one.

关键词： Repetitive upsetting Magnesium alloy Microstructure Precipitates Mechanical properties