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Influences of homogenizing temperature and excess Si on age-hardening behavior of Al-Mg-Si alloys

Keikinzoku/Journal of Japan Institute of Light Metals 2009年第6期59卷 305-309页

作者： Sakurai, Takeo Komatsu, Shin-Ya Kono, Norio Material and Process Research Section Aluminum Sheets and Coils Research Department Kobe Steel Ltd. 15 Kinugaoka Moka-shi Tochigi 321-4367 Japan Faculty of Chemistry Materials and Bioengineering Kansai University Suita-shi Osaka Japan Faculty of Engineering Chiba Institute of Technology Narashino-shi Chiba Japan

Influences of homogenizing temperature and excess Si on age-hardening behavior of Al-0.93%Mg2Si alloy were investigated. From size distribution obtained by image analysis of secondary phase particles on SEM micrographs, amount of Mg-Si compound in the excess Si alloy was decreased from that in the as-cast state by homogenization at 823 K for 7.2 ks. The amount of Mg-Si compound after homogenization at 773 K lays between those in the as-cast and 823 K homogenized states. Estimating from the analyzed chemical composition, complete dissolving temperature of Mg and Si of the excess Si alloy is 782 K. Conductivity IACS% was decreased with elevating temperature of homogenization, confirming the decrease in amount of the Mg-Si compound and increase in solute concentration. Though the complete dissolving temperature of Mg and Si is elevated, excess addition of only 0.18%Si brings about a strengthening larger than the previously reported alloy containing 0.47 %Cu.

关键词： Silicon alloys

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Kinetic study on catalytic gasification of a modified sludge fuel

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Particuology 2008年第4期6卷 258-264页

作者： Byungho Song Dookie Kim Seungjae Lee Seokku Jeon Youngtai Choi Yoonseop Byoun Woonsig Moon Joonghee Lee Honggun Kim Hongki Lee Joongpyo Shim Department of Chemical Engineering Kunsan National University Department of Civil & Environmental Engineering Kunsan National University Korea Institute of Energy Research Process Plant Group Hyndai Engineering Co. Ltd. Korea Institute of Industrial Technology Micro Science Tech Co. Ltd. Core Technology Research Center for Fuel Cell Department of Mechanical & Auto. Engineering Jeonju University Department of Advanced Material Engineering Woosuk University

A new type of mixture fuel, sludge–oil–coal agglomerate (SOCA), was catalytically gasified with steam in a thermobalance reactor under atmospheric pressure. All the four catalysts studied (K2CO3, CaO, NiO and Fe2O3) were found capable of enhancing the steam gasification rate and significantly increasing the conversion of carbon. The ranking of catalytic activity was found to be K2CO3 CaO > NiO > Fe2O3. A modified volumetric-reaction model in the literature was used to describe the conversion behavior of the steam gasification studied by evaluating the kinetic parameters. Expressions of the apparent gasification rates for SOCA were presented for the design of catalytic gasification processes.

关键词： Sludge Coal Oil Steam gasification Catalyst Thermobalance Kinetics

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Fourier transform near infrared analysis of chemically delignified wheat and oat straw

Fourier transform near infrared analysis of chemically delig...

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2008 Nordic Wood Biorefinery Conference, NWBC 2008

作者： Krongtaew, Chularat Messner, Kurt Hinterstoisser, Barbara Fackler, Karin Institute of Chemical Engineering Vienna University of Technology Getreidemarkt 9/166-4 ViennaA-1060 Austria Department of Material Sciences and Process Engineering BOKU - University of Natural Resources and Applied Life Sciences Peter Jordan Strasse 82 ViennaA-1190 Austria

ISBN: (纸本)9789186018139

Wheat (Triticum L.) and oat (Avena L.) straw particles were subjected to delignifying pre-treatments to increase the accessibility of the polysaccharides. The pre-treated straw was digested by cell wall degrading enzymes to yield reducing sugars that may serve as precursor substances for bio-fuels. Fourier transform near infrared reflectance spectra were recorded and correlated to the total lignin content after pre-treatment and the amount of enzymatically released reducing sugars by means of partial least squares regression (PLSR). Lignin (7.9 - 20.7 %) and reducing sugars content (130 - 1000 mg/g) could be predicted in good correlation from near infrared spectra between 6900 and 5510 cm-1, a spectral region which is assigned to the 1st overtone of C-H, N-H, and O-H bond vibrations and assigned to lignin and polysaccharides of lignocellulosics.

关键词： Polysaccharides

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Optimal Hybridization in Two Parallel Hybrid Electric Vehicles using Dynamic Programming

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IFAC Proceedings Volumes 2008年第2期41卷 4642-4647页

作者： Olle Sundström Lino Guzzella Patrik Soltic Department of Mechanical and Process Engineering ETH Zurich 8092 Zurich Switzerland EMPA Material Science and Technology Überlandstrasse 129 8600 Dübendorf Switzerland

This study explores different hybridization ratios of two types of parallel hybrid electric vehicles, a torque assist parallel hybrid and a full parallel hybrid, with equal power-to-weight ratio. The powertrain consist of an internal combustion engine, an electric motor, and a NiMH battery. The different hybridization ratios are compared by their optimal fuel consumption for eight different drive cycles. The optimal fuel consumption is determined using dynamic programming for each of the different hybridization ratios. In the full parallel hybrid the engine and motor can be decoupled while in the torque assist hybrid the engine and motor are always mechanically connected. Results show that there are not only lower fuel consumption for the full hybrid but the need for hybridization is lower than in the torque assist hybrid for all eight cycles. The hybridization ratio where a full hybrid have the same fuel consumption as the optimal torque assist hybrid can differ as much as 51%.

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Influence of nanoscale marble (calcium carbonate CaCO3) on properties of D600R surfacing electrode

Influence of nanoscale marble (calcium carbonate CaCO3) on p...

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materials Science and technology Conference and Exhibition, MS and T'08

作者： Bingquan, Chen Fang, Han Yongxi, Huang Kuiqing, Lu Yushuang, Liu Li, Leijun Wuhan University of Technology Department of Material Process Engineering Wuhan China Sinosteel Xingtai Machinery and Mill Roll Co. Xingtai Hebei China Wuhan Anchor Welding Consumables Co. Wuhan China Department of Mechanical and Aerospace Engineering Utah State University Logan UT 84322-4130 United States

ISBN: (纸本)9781605606217

Conventional micro-scale marble in the flux coating of D600R, a hardfacing shielded metal-arc welding electrode, was replaced by marble of nanoscale sizes for possible enhanced electrode characteristics. The micro-scale marble was substituted with different proportions of nanoscale marble particles. An arc characteristics analyzer was used to measure the welding current, arc voltage, and short-circuiting characteristics of the electrode under various welding conditions. Hardness and wear resistance properties of the weld deposit were characterized. The results show that the smaller marble particle sizes in the flux coating produced lower short-circuiting voltage, lower short-circuiting current, and shorter short-circuiting time. A significantly improved arc stability resulted in better welding characteristics of the electrode. The nanoscale marble particles in flux coating produced greater metal deposition efficiency, as well as increased hardness and wear resistance of the deposit. © 2008 MS&T'O8 ®.

关键词： Calcium carbonate

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Preparation and study on electroosmosis performance of photo-active glass-ceramic/PDMS microfluidic chips

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Weixi Jiagong Jishu/Microfabrication technology 2008年第5期 24-26页

作者： Cheng, Li-Li Wang, Sheng-Gao Deng, Xiao-Qing Yu, Dong-Dong Li, Yan-Qiong Wang, Jian-Hua Provincial Key Laboratory of Plasma Chemistry and Advanced Materials Wuhan 430073 China School of Material Science and Engineering Wuhan Institute of Technology Wuhan 430073 China Key Laboratory for Green Chemical Process Wuhan 430073 China

Through the photo-chemical machining process and plasma modification, the microfluidic chips were prepared with photo-active glass-ceramic as substrate and poly (dimethylsiloxane) (PDMS) as cover plate. The results show that the fabrication process of the microfluided chip is simplified, and the electroosmosis property is steady. The velocity of the electroosmosis of the microfluided chip is growing with the increasing of the buffer concentration, and the using of surfactants could improve the velocity of the electroosmosis. The voltage within 1800 V has good line relationship with the velocity of the electroosmosis.

关键词： Electroosmosis Microfluidic chips PDMS Photo-active glass-ceramic

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A kinetic study of nickel coating on boron nitride micro-particles

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Zeitschrift fuer Metallkunde/materials Research and Advanced Techniques 2007年第6期98卷 526-534页

作者： Li, Fan Zhang, Dengjun Sichen, Du Department of Material Science and Engineering Royal Institute of Technology Brinellvägen 23 StockholmSE 10044 Sweden Institute of Process Engineering Chinese Academy of Sciences Beijing China

In the present work, the mechanism of nickel coating on BN particles by hydrazine reduction was studied. A nickel sulfate - ammonium sulfate - ammonia - hydrazine hydrate plating system was employed. It was found that Pd on the surface of BN particles acted as an active center for nickel deposition at the initial stage of the process. Thereafter, Ni itself would act as an active center to catch Ni from the solution through the reaction: Ni2+ + 2Had∗ = > Ni + 2H+. The rate of the process was found to be controlled by the reaction at the interface under the present experimental conditions. A kinetic model was proposed on the basis of the experimental results. The model predictions were found to be in agreement with the experimental data.

关键词： Kinetics

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A statistical verification method in modeling mass customization in a production system of asynchronous stochastic learning curves

A statistical verification method in modeling mass customiza...

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IIE Annual Conference and Expo 2007 - Industrial engineering's Critical Role in a Flat World

作者： Lu, Roberto F. Storch, Richard L. Commercial Airplanes Material and Process Technology Boeing Company Mail Code: 19-FA P.O. Box 3707 Seattle WA 98124-2207 United States Industrial Engineering University of Washington Box 352650 Seattle WA 98195-2650 United States

The recent trend in mass customization (MC) has been in practice in many industries from on-line T-shirt shops all the way to boats, cars, and airplanes. One of the challenges in exercising mass customization is to manage unequal lead times among all associated partners in the production system. Asynchronous unequal lead times combined with the nature of the learning effect create asynchronous stochastic learning curves (ASLC) among partners in a mass customization production system. Mass customized products demand unequal amount of configuration and production times that can be difficult to plan by traditional deterministic scheduling methods. Discrete event simulation modeling is one of the capable tools to present such system. This work is to address one statistical method that can be applied to verify discrete event modeling of a mass customized production system of ASLCs.

关键词： Discrete event simulation

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A study on the robust stability of multirate systems

A study on the robust stability of multirate systems

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IEEE International Conference on Robotics and Biomimetics

作者： Jian Yang Jie Sheng Institute of Chemical Engineering Process and Machinery Department of Material and Chemical Engineering University of Zhejiang Hangzhou China Department of Electrical and Computer Engineering School of Science DigiPen Institute of Technology Redmond WA USA

ISBN: (纸本)9781424417612

This paper studies the stability robustness of a multirate system where sensing data are obtained n (n > 1 is an integer) times slower than the control variables are updated. The robust controller is designed for such systems by using the H infin technique. The procedure to check the robust stability of the controlled system is presented; and an illustrative example is given to show the effects of the value n on the robust stability of the system with the designed H infin controller.

关键词： Robust stability Control systems Chemical sensors Intelligent sensors Switches Sensor systems Chemical engineering Robust control Chemical industry Intelligent robots

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Corrigendum to “Transport mechanism of chromium(III) through the unmixed bulk liquid membrane containing dinonylnaphthalenesulfonic acid as a carrier” [J. Membr. Sci. 289 (2007) 187–190]

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Journal of Membrane Science 2007年第1-2期296卷 195-195页

作者： R. Gawroński P. Religa Faculty of Chemical and Process Engineering Warsaw University of Technology Waryńskiego 1 Warsaw Poland Faculty of Material Science and Footwear Technology Radom University of Technology Chrobrego 27 Radom Poland

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