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15th Gums and Stabilisers for the Food Industry Conference 2009

作者： Einhorn-Stoll, Ulrike Guyot, Christopher Rittweger, Carsten Food Science and Food Chemistry Food Quality and Material Science Technische Universitaet Berlin Koenigin-Luise-Strasse 22 D-14195 Berlin Germany Department for Food Process Engineering and Dairy Technology Technische Universität München Weihenstephaner Berg 1 D-85354 Freising Germany

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Control of Interfacial Structure of Potassium Niobate-Barium Titanate Ceramics and Their Dielectric Properties

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IOP Conference Series: materials Science and engineering 2011年第9期18卷

作者： K Yamashita S Shimizu I Fujii K Nakashima N Kumada T Tsukada T S Suzuki T Uchikoshi Y Sakka S Wada Material Science and Technology Interdisciplinary Graduate School of Medical and Engineering University of Yamanashi 4-4-37 Takeda Kofu Yamanashi 400-8510 Japan Materials Process Development Center TDK Co. Ltd. 570-2 Matsushita Minamihatori Narita Chiba 286-8588 Japan National Institute for Materials Science 1-2-1 Sengen Tsukuba Ibaraki 305-0047 Japan

ANbO3 – BaTiO3 (A = K, Na, or K0.5Na0.5) system ceramics were prepared using a conventional sintering method, and their dielectric properties were investigated. It was found that the dielectric constant of KNbO3-BaTiO3 system ceramics did not strongly depend on temperature between 20 and 400 °C, making them useful for capacitor application. However, the dielectric constant of KNbO3-BaTiO3 system ceramics was low. The high dielectric constant is attributable to a large area of interfaces between KN and BT grains. Ceramics sintered by spark plasma sintering (SPS) are expected to suppress a grain growth, increasing area of the interfacial layer. In this study, SPS method was employed to achieve a large area of the interfaces and to see how the dielectric properties change with the interfacial structure. The structure was controlled by changing sintering temperatures and time of the spark plasma sintering. As a result, X-ray diffraction patterns showed that perovskite single phase and their relative densities were greater than 97%. By contrast, the dielectric constant was decreased.

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Construction of TiO2 Nanotube-structured Functional materials and Its Sensing-behavior to Chemical Vapors

Construction of TiO2 Nanotube-structured Functional Material...

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第五届上海国际分析化学研讨会

作者： Xingfa Ma Xiaochun He Mingjun Gao Pengfei Ding Guang Li School of Environmental and Material Engineering Yantai University Yantai 264005 P. R.China State School of Environmental and Material Engineering Yantai University Yantai 264005 P. R.China National Laboratory of Industrial Control Technology Institute of Advanced Process ControlZhejiang

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Enhanced piezoelectric properties of lead-free piezoelectric materials by microstructure control

Enhanced piezoelectric properties of lead-free piezoelectric...

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12th International Meeting on Ferroelectricity, IMF-12 and the 18th IEEE International Symposium on Applications of Ferroelectrics, ISAF-18

作者： Wada, Satoshi Shimizu, Shigehito Pulpan, Petr Kumada, Nobuhiro Tanaka, Daisuke Furukawa, Masahito Moriyoshi, Chikako Kuroiwa, Yoshihiro Material Science and Technology Interdisciplinary Graduate School of Medical and Engineering University of Yamanashi 4-4-37 Takeda Kofu 400-8510 Japan Materials and Process Development Center TDK Co. Ltd. 70-2 Matsugashita Minamihatori Narita Chiba 286-8588 Japan Department of Physical Science Hiroshima University 1-3-1 Kagamiyama Higashihiroshima Hiroshima 739-8526 Japan

Barium titanate (BaTiO3, BT)potassium niobate (KNbO3, KN) solid solution system (0.5BT-0.5KN) ceramics with various microstructures were prepared by two-step sintering method, and their piezoelectric properties were investigated. For 0.5BT-0.5KN ceramics, two phases, ferroelectric tetragonal and ferroelectric orthorhombic, coexisted in different grains at room temperature, owing to the limited solid solution system. The volume fraction of interface region between BT-rich tetragonal and KN-rich orthorhombic grains was controlled by sintering temperatures, and increased with decreasing sintering temperatures. Apparent piezoelectric constant d33* was measured using slope of strain vs. electric field curves. As the results, the d 33* increased with decreasing sintering temperatures, which revealed that interface region between tetragonal and orthorhombic grains could contribute to enhancement of piezoelectric properties. Copyright © 2010 Taylor & Francis Group, LLC.

关键词： Barium titanate

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Influence of New Sol-Gel Refractory Coating on the Casting Properties of Cold Box and Furan Cores for Grey Cast Iron

Influence of New Sol-Gel Refractory Coating on the Casting P...

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第69届世界铸造会议暨2010中国铸造活动周

作者： U.C.Nwaogu T.Poulsen C.Bischoff N.S.Tiedje Technical University of Denmark Department of Mechanical EngineeringInstitute of Production and Process TechnologyDK-2800 Kgs.LyngbyDenmark Danish Technological Institute Centre for Material TestingKongsvang Alle 298000 ArhusDenmark

New Sol-Gel coated sand cores made from coldbox and furan binder systems were *** idea of the coating was to improve the surface quality of *** iron was cast on the cores in a sand casting *** effect of the high temperature of the melt on the cores was assessed by measuring the heating *** viscosity of the coating,moisture content and the permeability of the cores were *** surface quality of the castings was investigated using SEM and *** results show that the moisture content of the cores affected the *** furan cores the vapour transport zone(VTZ) when in contact with the melt is larger than it is in a coldbox which means the furan cores have higher moisture *** new sol-gel coating has the potential for improving the surface quality of castings without negative effects on the graphite *** surface of castings made using the new sol-gel coated furan cores show better surface quality than those made using the coldbox.

关键词： heating curves permeability moisture content coldbox furan casting surface quality

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Microstructure Control of Barium Titanate - Potassium Niobate Solid Solution System Ceramics by MPB engineering and Their Piezoelectric Properties

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IOP Conference Series: materials Science and engineering 2011年第9期18卷

作者： Shigehito Shimizu Nobuhiro Kumada Kouichi Nakashima Ichiro Fujii Daisuke Tanaka Masahito Furukawa Yoshihiro Kuroiwa Tohru S Suzuki Tetsuo Uchikoshi Yoshio Sakka Satoshi Wada Material Science and Technology Interdisciplinary Graduate School of Medical and Engineering University of Yamanashi 4-4-37 Takeda Kofu Yamanashi 400-8510 Japan Materials Process Development Center TDK Co. Ltd. 570-2 Matsushita Minamihatori Narita Chiba 286-8588 Japan Department of Physical Science Hiroshima University 1-3-1 Kagamiyama Higashi-Hiroshima Hiroshima 739-8526 Japan National Institute for Materials Science 1-2-1 Sengen Tsukuba Ibaraki 305-0047 Japan

KBaTiNbO6, i.e., 0.5BT-0.5KN complete solid solution ceramics and barium titanate (BaTiO3, BT) - potassium niobate (KNbO3, KN) system (0.5BT-0.5KN) ceramics with various microstructures were prepared by conventional sintering method and two-step sintering method. The 0.5BT-0.5KN with diffusion of BT and KN completely were paraelectrics. Their microstructures were investigated using X-ray diffraction (XRD) measurement and scanning electron microscopy (SEM). KBaTiNbO6 at room temperature was assigned to cubic Pm3m symmetry. For the 0.5BT-0.5KN patially solid solution system ceramics, the control of the interface area between two phases was important to enhance piezoelectric property. Their piezoelectric property was measured, and the apparent piezoelectric constant d33* increased with increasing interface area.

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Die design for cold precision forging of bevel gear based on finite element method

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Journal of Central South University 2009年第4期16卷 546-551页

作者：金俊松夏巨谌王新云胡国安刘华 State Key Laboratory of Material Process and Die & Mould Technology Huazhong University of Science and Technology Metal Forming Division Zhengzhou Research Institute of Mechanical Engineering

The finite element analysis （FEA） software Ansys was employed to study the stress state of the dies of both plane and non-plane parting face structures with uniform interference and the die of plane parting face structure with non-uniform interference. Considering the symmetry of the die, a half gear tooth model of the two-ring assembled die with 2.5 GPa inner pressure was constructed. Four paths were defined to investigate the stress state at the bottom comer of the die where stress concentration was serious. FEA results show that the change of parting face from non-plane to plane can greatly reduce the stress at the teeth tips of the die so that the tip fracture is avoided. The interference structure of the die is the most important influencing factor for the stress concentration at the bottom comer. When non-uniform interference is adopted the first principal stress at the comer on the defined paths of the die is much lower than that with uniform interference. The bottom hole radius is another important influencing factor for the comer stress concentration. The first principal stress at the comer of the plane parting face die with non-uniform interference is reduced from 2.3 to 1.9 GPa when the hole radius increases from 12.5 to 16.0 mm. The optimization of the die structure increases the life of the die from 100 to 6 000 hits.

关键词： die gear precision forging finite element analysis optimized design

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Effect of Particle Properties on the Solid Flow Profile in a Blast Furnace

Effect of Particle Properties on the Solid Flow Profile in a...

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第五届国际炼铁科技大会

作者： R Safavi Nick A Tilliander T L I Jonsson P G Jnsson Division of Applied Process Metallurgy Department of Material Science and EngineeringRoyal Institute of Technology

An ironmaking blast furnace is one of the most complex reactors working with a multiphase flow involving gas, liquid and solid. The solid phase is the most important phase among these three phases. Consequently, investigating the velocity profile of solid particles as a primary phase in the blast furnace is one of the major research focus during the last decay. Since the major outbreak of computer development during the last twenty years, mathematical modeling and numerical solution plays an important role in the engineering development. Therefore, the solid particle behavior is modeled based on general conservation laws to investigate the profile of solid particles. The different properties of solid particles have different effect on the velocity profile of solid particles. Therefore, in this article, the effect of particle properties such as diameter, viscosity, density and volume fraction. on velocity profile of solid particles and blast furnace operation has been studied and reported.

关键词： blast furnace particle properties solid flow mathematical modeling

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Influence of nanoscale marble calcium carbonate CaC03) on properties of D600R surfacing electrode

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Welding Journal (Miami, Fla) 2009年第5期88卷 99-s-103-S页

作者： Chen, B. Han, F. Huang, Y. Lu, K. Liu, Y. Li, L. Wuhan University of Technology Department of Material Process Engineering Wuhan China Sinosteel Xingtai Machinery Mill Roll Co. Xingtai Hebei China Wuhan Anchor Welding Consumables Co. Wuhan China Department of Mechanical and Aerospace Engineering Utah State University Logan UT United States

the flux coating of D600R, a hardfac-ing shielded metal-arc welding electrode, was replaced by marble of nanoscale sizes for possible enhanced electrode characteristics. The mi-croscale marble was substituted with different proportions of nanoscale marble particles. An arc characteris-tics analyzer was used to measure the welding current, arc voltage, and short-drcuiting 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-fircuiting 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.

关键词： Hardness

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Tandem multimer expression of angiotensin I-converting enzyme inhibitory peptide in Escherichia coli

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Biotechnology Journal 2009年第9期4卷 1345-1356页

作者： Fida, Hasan M. Kumada, Yoichi Terashima, Masaaki Katsuda, Tomohisa Katoh, Shigeo Department of Molecular Science and Material Engineering Graduate School of Science and Technology Faculty of Engineering Kobe Japan Department of Chemistry and Materials Technology Kyoto Institute of Technology Kyoto Japan Department of Biosphere Sciences School of Human Science Kobe College Nishinomiya Japan Department of Chemical Engineering Hanyang University 1271 Sa-3-dong Sangrok-gu Ansan 426-791 Korea Republic of Department of Process Engineering and Applied Science Food Science and Technology Program Dalhousie University 1360 Barrington Street Halifax NS B3J 2X4 Canada

It is common for small tandem peptide multimer genes to be indirectly inserted into expression vectors and fused with a protein tag. In this study, a multimer of the tandem angiotensin I-converting enzyme inhibitory peptide (ACE-IP) gene was directly transferred to a commercially available vector and the designed gene was expressed as a repeated peptide in Escherichia coli BL21(DE3)pLysS. The process further developed in our study was the construction of six-repeated ACE-IP synthetic genes and their direct insertion. Protein expression in inclusion bodies was confirmed by SDS-PAGE and Western blot. Acid hydrolysis of inclusion bodies produced single-unit peptides through cleavage of the aspartyl-prolyl bonds. This cleaved recombinant peptide (rACE-IP) was purified using immuno-affinity chromatography followed by reversed phase-HPLC. 105-115 mg of the lyophilized recombinant peptide was obtained from 1 L E. coli culture. In vitro biological activity of rACE-IP was indistinguishable from that of the natural peptide produced by hydrolysis in artificial gastric juice or by acidic hydrolysis. The rACE-IP prepared by recombinant DNA technology and solid-phase synthesis methods showed a similar IC50. This strategy could be used for the expression of important peptides, which have N-terminal proline (P) and C-terminal aspartic acid residues (D) for commercial applications, e.g. functional foods and drinks. © 2009 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

关键词： Peptides

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