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Analytical and Experimental Studies on Critical Blank-holder Forces in Cylindrical cup deep drawing

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上海交通大学学报 2004年第Z2期38卷 101-107页

作者： lin Zhongqin sun Chengzhi Chen Guanlong Yu Haiyan School of Mechanical Engineering Shanghai Jiaotong University Shanghai200030 China School of Mechanical Engineering Shanghai Jiaotong University Shanghai200030 China School of Mechanical Engineering Shanghai Jiaotong University Shanghai200030 China School of Mechanical Engineering Shanghai Jiaotong University Shanghai200030 China

Based on the plastic deformation theory and energy method, the critical blank-holder forces (BHF) of wrinkling and fracture in the cylindrical cup deep-drawing are analyzed. The verify experiments were performed and compared with the theory analysis results. The predictions agree well with the experiment results. Thus, the validated presenttheoretical analysis model may be applied to determinate the suitable BHF.

关键词： blank-holder force wrinkle limit fracture limit sheet metal forming formability window

Optical-digital joint design method for Cassegrain optical system with large FOV

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Optoelectronics Letters 2022年第9期18卷 525-529页

作者： sun lin CUI Qingfeng School of Opto-Electronic Engineering Changchun University of Science and TechnologyChangchun 130022China

The field of view(FOV) of the traditional Cassegrain optical system is small, generally only 0.1°-0.2°. In order to enlarge the FOV, it is usually necessary to add correction groups or change the mirror type, but it introduces color difference and complicates the structure. In this study, an optical digital joint design method is put forward to expand the FOV of the Cassegrain optical system. First, the structural parameters of the system are optimized to control the aberration. Then, based on the wavefront aberration theory, the wavefront aberration model is constructed using Zernike polynomials, and the point spread function model is established using Fourier transform. Finally, the image is processed using the spatial transform deconvolution algorithm. The FOV of the Cassegrain optical system is expanded using only primary and secondary mirror structures. The simulation experiment of the Cassegrain optical system shows that the FOV is expanded approximately 6 times, and the imaging quality is improved. The simulation results indicate that our method is feasible.

关键词： structure system mirror

Case of early-onset Alzheimer’s disease with atypical manifestation

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General Psychiatry 2021年第1期34卷 49-52页

作者： lin Zhu Limin sun lin sun Shifu Xiao Department of Rehabilitation Medicine Shanghai No.3 Rehabilitation HospitalShanghaiChina Department of Rehabilitation Medicine Huashan Hospital Fudan UniversityShanghaiChina Department of Geriatric Psychiatry Shanghai Mental Health CenterShanghaiChina Alzheimer's Disease and Related Disorders Center Shanghai Jiao Tong UniversityShanghaiChina

Short-term memory decline is the typical clinical manifestation of Alzheimer’s disease(AD).However,early-onset AD usually has atypical symptoms and may get *** the present case study,we reported a patient who experienced symptoms of memory loss with progressive non-fluent aphasia accompanied by gradual social *** did not meet the diagnostic criteria of AD based on the clinical manifestation and brain ***,his cerebrospinal fluid examination showed a decreased level of beta-amyloid 42,and increased total tau and phosphorylated *** amyloid β-protein deposition by 11C-Pittsburgh positron emission tomography confirmed the diagnosis of frontal variant *** case indicated that early-onset AD may have progressive non-fluent aphasia as the core *** combination of individual and precision diagnosis would be beneficial for similar cases.

关键词： diagnosis Alzheimer tau

Electroacupuncture regulates the stress-injury-repair chain of events after cerebral ischemia/reperfusion injury

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Neural Regeneration Research 2017年第6期12卷 925-930页

作者： Peng Shi lin-lin sun Yi-shuo Lee Ya Tu School of Acupuncture-Moxibustion and Tuina Beijing University of Chinese Medicine

Inflammation after stroke is the main cause of cerebral ischemia/reperfusion injury. Cascading events after injury can lead to cell death. Heat shock protein 70 and other endogenous injury-signaling molecules are released by damaged cells, which can lead to systemic stress reactions. Protecting the brain through repair begins with the stress-injury-repair signaling chain. This study aimed to verify whether acupuncture acts through this chain to facilitate effective treatment of ischemic stroke. Rat models of cerebral ischemia/reperfusion injury were established by Zea Longa＇s method, and injury sites were identified by assessing neurological function, 2,3,5-triphenyltetrazolium chloride staining, and hematoxylin-eosin staining. Electroacupuncture at acupoints Baihui（DU20） and Zusanli（ST36） was performed in the model rats with dilatational waves, delivered for 20 minutes a day at 2–100 Hz and an amplitude of 2 m A. We analyzed the blood serum from the rats and found that inflammatory cytokines affected the levels of adrenotrophin and heat shock protein 70, each of which followed a similar bimodal curve. Specifically, electroacupuncture lowered the peak levels of adrenocorticotrophic hormone and heat shock protein 70. Thus, electroacupuncture was able to inhibit excessive stress, reduce inflammation, and promote the repair of neurons, which facilitated healing of ischemic stroke.

关键词： repair acupuncture hematoxylin eosin minutes endogenous Acupuncture neurological inflammation staining

Novel Photodetectors Based on Double-Walled Carbon Nanotube Film/TiO2 Nanotube Array Heterodimensional Contacts

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Nano Research 2011年第9期4卷 901-907页

作者： Mingjie Yang Jia-lin Zhu Wei Liu Jia-lin sun Department of Physics and State Key Lab of Low-Dimensional Quantum Physics Tsinghua University Beijing 100084 China Laboratory of Advanced Materials Department of Material Science and Engineering Tsinghua University Beijing 100084 China

A new kind of photodetector based on a double-walled carbon nanotube （DWCNT） film and a TiO2 nanotube array with hetrodimensional non-ohmic contacts has been fabricated. Due to the dimensionality difference effect, the DWCNT film/TiO2 nanotube array photodetector exhibits a much higher photocurrent-to-dark current ratio and photoresponse relative to an Au film/TiO2 nanotube array device, even at small bias voltage. The photocurrent-to-dark current ratio reached four orders of magnitude and a high photoresponse of 2467 A/W was found upon irradiation at 340 nm. Furthermore, the photosensitive regions could be extended into the visible range. The photocurrent-to-dark current ratio reached approximately three orders of magnitude upon irradiation at 532 nm, where the photon energy is much lower than the band gap of TiO2.

关键词： Photodetectors double-wailed carbon nanotube (DWCNT) films TiO2 nanotube arrays heterodimensional contacts

Forest Mapping and Classification with Compact PolinSAR Data

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Journal of Beijing Institute of Technology 2018年第3期27卷 391-398页

作者： Ningxiao sun Yuejin Zhao lin sun Qiongzhi Wu School of Optoelectronics Beijing Institute of Technology School of Information and Electronics Beijing Institute of Technology

An unsupervised classification method was applied to compact polarimetric-interferometric SAR（C-PolinSAR）data to investigate its potential for forest mapping and *** classification requires an initial class as a training *** this paper,the compact polarimetric entropy H and the optimal coherence spectrumA were computed,and their capabilities for initial classification were *** on the Hand A,apartition method was proposed to subdivide the H-A plane,and initial classes were hence ***,unsupervised C-PolinSAR segmentation procedures based on H-A and the complex coherence matrix J;were *** effectiveness of the unsupervised classification of C-PolinSAR data was demonstrated by using an E-SAR L-band PolinSAR dataset of the Traunstein test site.

关键词： forest mapping unsupervised classification Wishart classifier optimal coherence set com-pact polarimetric-interferometric SAR(C-PolinSAR)

Preparing Nano-ZnS by Solid State Reaction at Room Temperature

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Chinese Chemical Letters 2001年第2期12卷 187-188页

作者： Xiao lin sun Guang Yan HONG Laboratory of Rare Earth Chemistry and Physics Changchun Institute of Applied ChemistryChangchun 130022

ZnS nanoparticles were prepared by using solid-state reaction method at room temperature in agate mortar for the first time. The average particle size was about 20nm. This reaction is affected by the structure of reac... 详细信息

关键词： Zn nanoparticle solid-state reaction room temperature

On Total Colorings of Some Special 1-planar Graphs

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Acta Mathematicae Applicatae Sinica 2017年第3期33卷 607-618页

作者： lin sun Jian-liang WU Hua CAI Department of Mathematics Changji University School of Mathematics Shandong University

A graph is 1-planar if it can be drawn on the plane so that each edge is crossed by at most one other edge. In this paper, we verify the total coloring conjecture for every 1-planar graph G if either △（G） ≥9 and g（G）≥ 4, or △（G） ≥ 7 and g（G）≥5, where △（G） is the maximum degree of G and g（G） is the girth of G.

关键词： 1-planar graph total coloring discharging method girth r-minimal graph

A Totally(Δ+1)-colorable 1-planar Graph with Girth at Least Five

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Acta Mathematica Sinica,English Series 2016年第11期32卷 1337-1349页

作者： lin sun Jian Liang WU Hua CAI School of Mathematics Shandong University Ji'nan 250100 P. R. China Department of Mathematics Changji University Changji 831100 P. R. China

A graph is 1-planar if it can be drawn on the plane so that each edge is crossed by at most one other edge. In this paper, we prove that every 1-planar graph G with maximum degree △（G）〉 12 and girth at least five... 详细信息

关键词： 1-planar graph total coloring discharging method girth