检索结果-南通市图书馆

Journal of Renewable Materials 2022年第7期10卷 1829-1844页

作者： Cuicui Wang Xin Wei Lee MSmith Ge Wang Shuangbao Zhang Haitao Cheng International Centre for Bamboo and Rattan Beijing100102China Department of Mechanical and Energy Engineering University of North TexasDenton76203USA Beijing Key Laboratory of Wood Science&Engineering College of Material Science&TechnologyBeijing Forestry UniversityBeijing100083China

In order to investigate the effect of the relative motion of nano CaCO_(3)reinforced bamboo pulp fiber(BPF)/HDPE composite components on the mechanical performance,a comparative study was performed.BPF was treated by nano CaCO_(3)blending(BM)and impregnation modification(IM)technology.The composites were produced using hot press(HPMP),extrusion(EMP)and injection molding process(IMP).The physical morphology of BPF was similar at different manufacturing processes.Compared to the samples manufactured by HPMP,a decrease in the(specific)flexural strength of BPF/HDPE composites and an increase in those of composites treated by nano CaCO_(3)manufactured by EMP and IMP were observed.The injection molded composites exhibited the best values in the(specific)impact strength,(specific)tensile properties.IM had a greater effect on the rheological behavior of the composites than BM,and nano CaCO_(3)treatment most effectively affected the performance of the extrusion molded composites.

关键词： Nano CaCO_(3) bamboo pulp fiber composites manufacturing process mechanical properties rheological properties

Starting materials, processes and characteristics of bio-based foams: A review

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Bioresources and Bioproducts 2024年第2期9卷 160-173页

作者： Xiaohan Wang Jinwon Jang Yanqun Su Jingang Liu Hongjie Zhang Zhibin He Yonghao Ni National Engineering Laboratory for Pulp and Paper China National Pulp and Paper Research Institute Co.Ltd.Beijing 100102China Limerick Pulp and Paper Centre and Department of Chemical Engineering University of New BrunswickNew Brunswick E3B 5A3Canada

Biofoam products have attracted considerable attention lately because there is a growing demand for green/sustainable products.To this end,various biobased foams have either been developed or are currently in development,e.g.,bio-based polyurethanes(PUs),polylactic acid(PLA),starch,and polyhydroxyalkanotates(PHAs).Indeed,significant progress has been made;however,chal-lenges still persist,for example,biobased foam products have poor processability,inferior com-patibility,thermal and strength properties.In this review,we focus on five biofoam products:namely bio-based PUs,PLA,starch,PHAs,and cellulose biofoam products,along with their prop-erties and performance,as well as their manufacturing processes.Further efforts are still needed to unlock the full potential of these bio-based products and meet the goal of complementing and gradually replacing some of their fossil-based counterparts.Finally,the challenges,as well as arising opportunities of future research directions are discussed.

关键词： Biofoam Bio-based polyurethanes Polylactic acid Polyhydroxyalkanotate Starch Cellulose manufacturing process

A Review of Basic Mechanical Properties of Bamboo Scrimber Based on Small-Scale Specimens

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2024年第4期12卷 869-894页

作者： Xin Xue Haitao Li Rodolfo Lorenzo College of Civil Engineering Nanjing Forestry UniversityNanjing210037China National-Provincial Joint Engineering Research Center of Biomaterials for MACHINERY PACKAGE Nanjing Forestry UniversityNanjing210037China Jiangsu Engineering Research Center of Bamboo and Wood Carbon FixationMaterials and Structures Nanjing Forestry UniversityNanjing210037China Department of Civil Environmental and Geomatic EngineeringUniversity College LondonLondonWC1E 6BTUK

This review summarizes the existing knowledge about the mechanical properties of bamboo scrimber(BS)in literature.According to literature reviews,the strength of BS under different load modes is affected by a series of factors,such as the type of original bamboo,growth position,resin content,treatment method and density.Therefore,different production processes can be adopted according to different requirements,and bamboo scrimbers can also be classified accordingly.In addition,this review summarizes the changes in different factors considered by scholars in the research on the mechanical properties of BS,so that readers can have an overall understanding of the existing research and make more innovative and valuable research on this basis.This review provides and discusses the conclusive observations,the current research gaps and future research directions on the mechanical properties of BS.

关键词： Bamboo scrimber manufacturing process mechanical properties failure modes constitutive model

Research on Crucial manufacturing process of Rigid-Flex PCB

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Electronic Science and Technology of China 2006年第1期4卷 24-28页

作者：汪洋何为何波龙海荣刘美才吴苏 School of Microelectronics and Information Engineering University of Electronic Science and Technology of China Chengdu 610054 China Zhuhai Topsun Electric Technology Co. LTD. Zhuhai 519060 Guangdong China College of chemistry and Environment Protection Engineering Southwest University for Nationalities Chengdu 610041 China

The main characteristics, applications, the emphases of manufacturing process are introduced, and the research of new product of rigid-flex Printed Circuit Board （PCB） is also described. In particular, the plasma desmear process, which is the crucial problems of manufacturing process, is discussed in detail. Samsung 4-layer rigid-flex PCB has been developed successfully, and the qualification rate reaches to 89.4%.

关键词： Printed Circuit Borad （PCB） rigid-flex PCB manufacturing process plasma desmear process

Effect of Measurement Error on the Multivariate CUSUM Control Chart for Compositional Data

在线全文

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2023年第8期136卷 1207-1257页

作者： Muhammad Imran Jinsheng Sun Fatima Sehar Zaidi Zameer Abbas Hafiz Zafar Nazir School of Automation Nanjing University of Science and TechnologyNanjing210094China School of Economics and Statistics Guangzhou UniversityGuangzhou510006China Department of Mathematics and Statistics East China Normal UniversityShanghai200062China Department of Statistics Government Ambala Muslim Graduate CollegeSargodha40100Pakistan Department of Statistics University of SargodhaSargodha40100Pakistan

Control charts(CCs)are one of the main tools in Statistical process Control that have been widely adopted in manufacturing sectors as an effective strategy for malfunction detection throughout the previous decades.Measurement errors(M.E’s)are involved in the quality characteristic of interest,which can effect the CC’s performance.The authors explored the impact of a linearmodel with additive covariate M.E on the multivariate cumulative sum(CUSUM)CC for a specific kind of data known as compositional data(CoDa).The average run length(ARL)is used to assess the performance of the proposed chart.The results indicate that M.E’s significantly affects themultivariate CUSUM-CoDaCCs.The authors haveused theMarkov chainmethod to study the impact of different involved parameters using six different cases for the variance-covariance matrix(VCM)(i.e.,uncorrelated with equal variances,uncorrelated with unequal variances,positively correlated with equal variances,positively correlated with unequal variances,negatively correlatedwith equal variances and negatively correlated with unequal variances).The authors concluded that the error VCM has a negative impact on the performance of themultivariate CUSUM-CoDa CC,as the ARL increases with an increase in the value of the error VCM.The subgroup size m and powering operator b positively impact the proposed CC,as the ARL decreases with an increase in m or b.The number of variables p also has a negative impact on the performance of the proposed CC,as the values of ARL increase with an increase in p.For the implementation of the proposal,two illustrated examples have been reported formultivariate CUSUM-CoDaCCs inthe presence ofM.E’s.Onedealswith themanufacturingprocessof uncoated aspirin tablets,and the other is based on monitoring the machines involved in the muesli manufacturing process.

关键词： MCUSUM chart CoDa measurement error manufacturing process performance

PEDOT:PSS:From conductive polymers to sensors

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nanotechnology and Precision Engineering 2021年第4期4卷 89-107页

作者： Xiaoshuang Zhang Wentuo Yang Hainan Zhang Mengying Xie Xuexin Duan State Key Laboratory of Precision Measuring Technology and Instruments Tianjin UniversityTianjin 300072China

PEDOT:PSS conductive polymers have received tremendous attention over the last two decades owing to their high conductivity,ease of processing,and biocompatibility.As a flexible versatile material,PEDOT:PSS can be developed into various forms and has had a significant impact on emerging sensing applications.This review covers the development of PEDOT:PSS from material to physical sensors.We focus on the morphology of PEDOT:PSS in the forms of aqueous dispersions,solid films,and hydrogels.manufacturing processes are summarized,including coating,printing,and lithography,and there is particular emphasis on nanoimprinting lithography that enables the production of PEDOT:PSS nanowires with superior sensing performance.Applications to various physical sensors,for humidity,temperature,pressure,and strain,are demonstrated.Finally,we discuss the challenges and propose new directions for the development of PEDOT:PSS.

关键词： PEDOT:PSS Conductive polymer Sensor Physical sensor manufacturing process Morphology

Micro-scale Realization of Compliant Mechanisms:manufacturing processes and Constituent Materials-A Review

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2021年第4期34卷 20-41页

作者： Minchang Wang Daohan Ge Liqiang Zhang Just L.Herder Institute of Intelligent Flexible Mechatronics Jiangsu UniversityZhenjiang 212013China Department of Precision and Microsystems Engineering Faculty of MechanicalMaritime and Materials EngineeringDelft University of TechnologyMekelweg 22628CD DelftThe Netherlands

Compliant micromechanisms(CMMs)acquire mobility from the deflection of elastic members and have been proven to be robust by millions of silicon MEMS devices.However,the limited deflection of silicon impedes the realization of more sophisticated CMMs,which often require larger deflections.Recently,some novel manufacturing processes have emerged but are not well known by the community.In this paper,the realization of CMMs is reviewed,aiming to provide help to mechanical designers to quickly find the proper realization method for their CMM designs.To this end,the literature surveyed was classified and statistically analyzed,and representative processes were summarized individually to reflect the state of the art of CMM manufacturing.Furthermore,the features of each process were collected into tables to facilitate the reference of readers,and the guidelines for process selection were discussed.The review results indicate that,even though the silicon process remains dominant,great progress has been made in the development of polymer-related and composite-related processes,such as micromolding,SU-8 process,laser ablation,3D printing,and the CNT frameworking.These processes result in constituent materials with a lower Young’s modulus and larger maximum allowable strain than silicon,and therefore allow larger deflection.The geometrical capabilities(e.g.,aspect ratio)of the realization methods should also be considered,because different types of CMMs have different requirements.We conclude that the SU-8 process,3D printing,and carbon nanotube frameworking will play more important roles in the future owing to their excellent comprehensive capabilities.

关键词： Compliant micromechanism manufacturing process Constituent material

An Industrial Perspective on Magnesium Alloy Wheels: A process and Material Design

在线全文

学校读者我要写书评

暂无评论

Materials Sciences and Applications 2023年第1期14卷 20-44页

作者： Miaomiao Wang China Copper Institute of Engineering and Technology Beijing China Kunming Metallurgical Research Institute Co. Ltd. Beijing Branch Beijing China

Light weights wheels improve vehicle performance with respect to road handling, cornering as well providing fuel economy and reduced greenhouse gas emissions. Aluminum wheels are currently used in many models and are produced usually by low pressure assisted gravity casting. Important property requirements are fatigue strength, pressure tightness, tensile strength, impact resistance, and corrosion resistance. Many attempts have been made to convert aluminum road wheels to magnesium. Race cars and some of the high end models (Porsche, Ferrari, etc.) have used magnesium wheels. These wheels have been gravity cast or forged. Viable corrosion protection systems have been developed and magnesium wheels have been used with success on these models. To use magnesium on more modest models is a challenge due to cost issues. Higher productivity casting processes or more cost effective coating systems need to be utilized. The project consists of selecting magnesium alloys for road wheels, examining the possible cost effective casting processes and corrosion protection systems, evaluating the cost per one wheel and comparing it to aluminum wheel costs. The wheels will also be compared with respect to fatigue and impact properties, pressure tightness, and corrosion.

关键词： manufacturing process Die-Casting Corrosion Resistance Economic Viability

manufacturing cost optimization and estimation combined computer of composite-stiffened panels

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Harbin Institute of Technology(New Series) 2010年第3期17卷 369-375页

作者：叶金蕊张博明白光辉 Center for Composites & Structure Harbin Institute of Technology

The primary goal of this study is to fully grasp the production flow of the new processing technologies for manufacturing composite stiffened panels incorporating cost as one of the design variables early in the design process. An approach is presented to determine the optimum process for cost as objective function. A cost estimation model is established based on the integrally molding process. In the model,the cost drivers which are related to the manufacture processes in terms of material,labor,tool and equipment costs are taken into account. At the same time,estimation software combined computer is developed to aid optimization design. A case of manufacturing composite stiffened panels with T-shaped stiffeners is examined. Excellent agreement shows the optimum process for cost is obtained for the composite stiffened panel with cocuring. It is also revealed that the estimation software combined computer is efficient. The estimation methodology is valid to guide design of the manufacturing process for the composite-stiffened panel.

关键词： composite-stiffened panel manufacturing process optimization cost

Advances of physics-based precision modeling and simulation for manufacturing processes

在线全文

学校读者我要写书评

暂无评论

Advances in manufacturing 2013年第1期1卷 75-81页

作者： Gang Wang Yi-Ming Rong Department of Precision Instruments and Mechanology Tsinghua University Department of Mechanical Engineering Worcester Polytechnic Institute

The development of manufacturing process concerns precision, comprehensiveness, agileness, high efficiency and low cost. The numerical simulation has become an important method for process design and optimization. Physics-based modeling was proposed to promote simulations with a high accuracy. In this paper, three cases, on material properties, precise boundary conditions, and micro-scale physical models, have been discussed to demonstrate how physics-based modeling can improve manufacturing simulation. By using this method, manu- facturing process can be modeled precisely and optimized for getting better performance.

关键词： Material properties Multiscale analysis Physics-based modeling manufacturing process