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Fabrication and characterization of 3D scaffold using 3D plotting system

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Chinese Science Bulletin 2010年第1期55卷 94-98页

作者： LEE Jun-Hee PARK Su-A PARK KoEun KIM Jae-Hyun KIM Kyung-Shik LEE Jihye Kim WanDoo Bio-mechatronics Team Division of Nano-Machinery Korea Institute of Machinery and Materials (KIMM) Nano-Mechanics Team Division of Nano-Machinery Korea Institute of Machinery and Materials (KIMM) Nano-mechatronics Team Division of Nano-Machinery Korea Institute of Machinery and Materials (KIMM)

In this paper, we design and fabricate a 3D scaffold using rapid prototyping (RP) technology for tissue engineering. The scaffold should have a three-dimensional interconnected pore network. We fabricate a polycaprolactone (PCL) scaffold with interconnecting pores and uniform porosity for cell ingrowth using a 3D plotting system. In order to keep the three dimensional shape under mechanical loading while implanted, we design an oscillating nozzle system to increase elastic modulus and yield strength of PCL strand. We characterize the influence of pore geometry, compressive modulus of the scaffold, elastic modulus and yield strength of the strand using SEM, dynamical mechanical analysis (DMA) and Nano-UTM. Finally the cell responses on scaffolds are observed.

关键词：三维形状绘图系统表征支架制作动态机械分析弹性模量细胞反应

Adaptive Neuro-Fuzzy Modeling of Mechanical Behavior for Vertically Aligned Carbon Nanotube Turfs

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Journal of Materials Science & Technology 2011年第4期27卷 301-308页

作者： Mohammad Al-Khedher Charles Pezeshki Jeanne McHale Fritz Knorr mechatronics division Al-Balqa Applied University School of Mechanical and Materials Engineering Washington State University Department of Chemistry Washington State University

Several characterization methods have been developed to investigate the mechanical and structural properties of vertically aligned carbon nanotubes （VACNTs）. Establishing analytical models at nanoscale to interpret these properties is complicated due to the nonuniformity and irregularity in quality of as-grown samples. In this paper, we propose a new methodology to investigate the correlation between indentation resistance of multi-wall carbon nanotube （MWCNT） turfs, Raman spectra and the geometrical properties of the turf structure using adaptive neuro-fuzzy phenomenological modeling. This methodology yields a novel approach for modeling at the nanoscale by evaluating the effect of structural morphologies on nanomaterial properties using Raman spectroscopy.

关键词： Adaptive neuro-fuzzy Carbon nanotubes Image analysis Nanoindentation Raman spectroscopy

Effects of Deflection on the Sio_2 Barrier Layer and Mo Back Electrode of Cu(In,Ga)Se_2 Thin-Film Solar Cells on Stainless Steel Substrates

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稀有金属材料与工程 2012年第S1期41卷 74-77页

作者： Shi Zonhong Liang Shihchang Department of mechatronics Engineering National Changhua University of EducationChanghua 50007TaiwanChina Materials and Electro-Optics Research division Chung-Shan Institute of Science and TechnologyTaoyuan CountyTaiwanChina

This paper studies the effects of deflection on the SiO2 barrier layer and molybdenum(Mo)back electrode of Cu(In,Ga)Se2 thin-film solar cells,prepared via magnetron sputtering on type SUS431 stainless steel *** surface micro-cracks and sheet resistance of thin films had been observed and measured for in-situ bend *** results show that increasing the thickness of the SiOx barrier has a better property to prevent cracks induced by bending *** sheet resistance of a Mo film increases alongside the bending of the curvature *** maximum allowed value of the curvature radius of the SiOx barrier layer,molybdenum electrodes,and the thin film CIGS absorbing layer should be 16 mm,20 mm,and 26 mm,***,the maximum curvature radius limit should be 26 mm or less for CIGS thin-film solar cells prepared via sputtering on type SUS431 stainless steel substrates.

关键词： electrochemical cell photosensing fill factor interface states photovoltage photocurrent

Machining characteristics of complex prism pattern on electroplated roll by copper

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中国有色金属学会会刊：英文版 2009年第B09期19卷 288-294页

作者： Tae-Jin JE Sang-Cheon PARK Kang-Won LEE Yeong-Eun YOO Doo-Sun CHOI Kyung-Hyun WHANG Myung-Chang KANG Nano-Machining Laboratory division of Nano-Mechanical Systems Korea Institute of Machinery and Materials Nano-mechatronics Department University of Science and TechnologySinseongnoYouseong-GuDaejeonKorea National Core Research Center for Hybrid Materials Solution Pusan National University

The BLU (back light unit) is the core component of the LCD for notebook, mobile-phone, navigation, as well as large sized TV, PID (public information display), etc. In order to enhance optical efficiency of LCD, optical films with the uniform prism patterns have been used for BLU by stacking two films up orthogonally. In this case, light interference-phenomenon occurred such as Morie, wet-out, u-turning, etc. It caused several problems such as low brightness, spots and stripes in LCD. Recently, the high-luminance micro complex prism patterns are actively studied to avoid the light interference-phenomenon and enhance the optical efficiency. In this study, the roll master to manufacture complex micro prism pattern film was machined by using the high precision lathe. The machined patterns on the roll master were 50, 45, 40, 35, 30, 25, 20, 15, 10 and 5 μm in the pitch with 25.0, 22.5, 20.0, 17.5, 15.0, 12.5, 10.0, 7.5, 5.0 and 2.5 μm in the peak height, respectively. The roll was 2 000 mm in length and 320 mm in diameter. The electroplated roll by copper and the natural single crystal diamond tool was used for machining the patterns. The cutting force was measured and analyzed for each cutting condition by using the dynamometer. The chips and the surfaces after being machined were analyzed by SEM and microscope.

关键词：车床加工微棱镜铜电镀特征光学效率光学薄膜笔记本电脑金刚石工具

The Design and Its Application of Cross-Coupled Controller in X-Y Table

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武汉理工大学学报 2006年第S3期28卷 783-787页

作者： XI Lei~1 WANG Xin~2 ZHANG Yi~1 (1.division of Control and mechatronics Engineering,Harbin Institute of Technology Shenzhen Graduate,Shenzhen 518055,China, 2.division of Mechanical Engineering & Automation,Harbin Institute of Technology Shenzhen Graduate,Shenzhen 518055,China) division of Control and mechatronics Engineering Harbin Institute of Technology Shenzhen GraduateShenzhen 518055China division of Mechanical Engineering & Automation Harbin Institute of Technology Shenzhen GraduateShenzhen 518055China

In conventional cross-coupled controller design,the method usually ignored the inherent characteristic of time-vary- ing parameters and model uncertainties in *** this paper,a cross-coupled controller(CCC)using an H~∞control scheme has been proposed to reduce the contouring error for an X-Y ***,the proposed CCC design,which is a typical Multi- Input Multi-Output(MIMO)system with linear time varying(LTV)characteristics,has been verified as being internally stable. The simulations are carried on Matlab simulink to verify the proposed method,and the results showed that the proposed method can reduce the contouring error significantly compared with the conventional one.

关键词： motion control cross-coupled control contour error H∞control

Nonlinear Dynamic MISO Identification in a Complex Noisy Environment

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Nonlinear Dynamic MISO Identification in a Complex Noisy Env...

Non-aqueous fractionation revealed changing subcellular metabolite distribution during apple fruit development

第二十七届中国控制会议

作者： Hametner Christoph Jakubek Stefan Institute of Mechanics and mechatronics Vienna University of Technology

ISBN: (纸本)9787900719706

An algorithm for nonlinear dynamic system identification using the Generalised Total Least Squares parameter estimation algorithm is presented in this *** many practical applications noise in measured input channels results in parameter estimates which are not consistent when conventional Least Squares parameter estimation methods are *** Least Squares methodologies are limited to situations where all inputs and the output respectively are corrupted by noise.A proper extension is the Generalised Total Least Squares algorithm which is able to cope with situations where some input channels of a MISO system are noise-free while others are taken from measurements and are thus subject to *** GTLS algorithm together with a well-tried model construction algorithm which is based on an hierarchical logistic discriminant tree results in an efficient algorithm for nonlinear dynamic identification.

关键词： Neuro-fuzzy modelling Logistic discriminant tree Generalised total least squares Errors-in-variables model

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Horticulture Research 2019年第1期6卷 556-567页

作者： Wasiye F.Beshir Takayuki Tohge Mutsumi Watanabe Maarten L.A.TMHertog Rainer Hoefgen Alisdair R.Fernie Bart M.Nicolaï division of mechatronics Biostatistics and Sensors(MeBioS)Department of Biosystems(BIOSYST)KU LeuvenLeuvenBelgium Max Planck Institute of Molecular Plant Physiology(MPI-MP) Potsdam-GolmGermany Flanders Centre of Postharvest Technology(VCBT) LeuvenBelgium

In developing apple fruit,metabolic compartmentation is poorly understood due to the lack of experimental *** subcellular compartments in fruit using non-aqueous fractionation has been technically difficult due to the excess amount of sugars present in the different subcellular compartments limiting the resolution of the *** work described in this study represents the first attempt to apply non-aqueous fractionation to developing apple fruit,covering the major events occurring during fruit development(cell division,cell expansion,and maturation).Here we describe the non-aqueous fractionation method to study the subcellular compartmentation of metabolites during apple fruit development considering three main cellular compartments(cytosol,plastids,and vacuole).Evidence is presented that most of the sugars and organic acids were predominantly located in the vacuole,whereas some of the amino acids were distributed between the cytosol and the *** results showed a shift in the plastid marker from the lightest fractions in the early growth stage to the dense fractions in the later fruit growth *** implies that the accumulation of starch content with progressing fruit development substantially influenced the distribution of plastidial fragments within the non-aqueous density gradient *** from this study provide substantial baseline information on assessing the subcellular compartmentation of metabolites in apple fruit in general and during fruit growth in particular.

关键词： technique distribution sugar

Self-interstitials generated on silicon bulk surface

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Progress in Natural Science:Materials International 2011年第1期21卷 17-20页

作者： Yukihiro KATO Ryoji FUKUDA Yuta TAKENO Toshitada SHIMOZAKI Takahisa OKINO Department of Design Engineering Semiconductor Business DivisionMitsumi Electric Co.LtdAtugi 243-0004Japan Department of Architecture and mechatronics Faculty of EngineeringOita UniversityOita 870-1192Japan Department of Materials and Technology Kyushu Institute of TechnologyKitakyushu 804Japan

The self-interstitial atoms in silicon generated by the bulk surface oxidation diffuse into the bulk inside and affect the phenomena such as the diffusions and the stacking *** generation rate of self-interstitials(Rgen) depends on theωpower of the oxidation film growth rate dX0/*** physical quantityωis important to understand the material science relevant to self-interstitials in the silicon ***,the conclusiveωvalue is not reported,although variousωvalues to control the generation rate have been *** the present study,the chemical reaction equation is analytically solved,and using the result,the oxidation stacking fault radius(r) is analytically expressed against the oxidation time(t).Comparing the obtained relation of r=r(t) with the experimental results of the stacking faults,the analytical expression of co is determined and the physical meaning ofωis ***,the temperature dependence ofωis also numerically determined.

关键词： silicon self-interstitial vacancy oxide impurity diffusion stacking fault

A Review of Structural Health Monitoring Techniques as Applied to Composite Structures

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Structural Durability & Health Monitoring 2017年第2期11卷 91-147页

作者： Amafabia,Daerefa-a Mitsheal Montalvao,Diogo David-West,Opukuro Haritos,George division of Automotive Mechanical and Mechatronics EngineeringSchool of Engineering and TechnologyUniversity of HertfordshireHatfield AL109ABUnited Kingdom Department of Design and Engineering Faculty of Science and TechnologyBournemouth UniversityPoole BH125BBDorsetUnited Kingdom

Structural Health Monitoring(SHM)is the process of collecting,interpreting and analysing data from structures in order to determine its health status and the remaining life *** materials have been extensively use in recent years in several industries with the aim at reducing the total weight of structures while improving their mechanical ***,composite materials are prone to develop damage when subjected to low to medium impacts(i.e.1-10 m/s and 11-30 m/s respectively).Hence,the need to use SHM techniques to detect damage at the incipient initiation in composite materials is of high *** the availability of several SHM methods for the damage identification in composite structures,no single technique has proven suitable for all *** must be noted that the amount of techniques available nowadays is too extensive to be comprehensively reviewed in a single ***,the focus will be on techniques that can serve as a starting point for studies focusing on damage detection,localisation,assessment and prognosis on certain kinds of ***,the line of thought behind the search and the structure of this review is a result of objectives beyond the scope of the paper ***,it was considered that,once the above was understood,an updated synopsis such as this could also be useful for other researchers in the same field.

关键词： SHM composite structures damage identification failure mechanisms low impact techniques