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作者： Kim, Chi Woo Jung, Jin Goo Choi, Jae Beom Kim, Deok Hui Yi, Chung Kim, Hye Dong Choi, Yun Ho Im, James Process Development Team 1 Samsung Mobile Display Co. Ltd. Cheonan-City Chungcheongnam-Do Korea Republic of Program in Materials Science and Engineering Department of Applied Physics and Applied Mathematics Columbia University New York NY 10027 United States

In this paper, we review various LTPS backplane technologies based on laser-crystallization and other related methods that have been applied to AMLCD and AMOLED displays. The TFT performances obtained by different melt-mediated crystallization methods with excimer laser and solid phase crystallization will be compared. The technical issues of the image quality and the resolution will be discussed. © 2011 SID.

关键词： Excimer lasers

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59.1:Invited Paper: LTPS Backplane Technologies for AMLCDs and AMOLEDs

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SID Symposium Digest of Technical Papers 2012年第1期42卷

作者： Chi Woo Kim Jin Goo Jung Jae Beom Choi Deok Hui Kim Chung Yi Hye Dong Kim Yun Ho Choi James Im Process Development Team 1 Samsung Mobile Display Co. Ltd. Cheonan-City Chungcheongnam-Do Process Development Team 2 Samsung Mobile Display Co. Ltd. Giheung-Gu Yongin-City Gyeonggi-Do Korea Program in Materials Science and Engineering Department of Applied Physics and Applied Mathematics Columbia University New York NY 10027 United States

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Invited paper: LTPS backplane technologies for AMLCDs and AMOLEDs

Invited paper: LTPS backplane technologies for AMLCDs and AM...

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49th Annual SID Symposium, Seminar, and Exhibition 2011, Display Week 2011

作者： Kim, Chi Woo Jung, Jin Goo Choi, Jae Beom Kim, Deok Hui Yi, Chung Kim, Hye Dong Choi, Yun Ho Im, James Process Development Team 1 Samsung Mobile Display Co. Ltd. Cheonan-City Chungcheongnam-Do Korea Republic of Process Development Team 2 Samsung Mobile Display Co. Ltd. Giheung-Gu Yongin-City Gyeonggi-Do Korea Republic of Program in Materials Science and Engineering Department of Applied Physics and Applied Mathematics Columbia University New York NY United States

ISBN: (纸本)9781618390967

关键词： Excimer lasers

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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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Microstructural development of porous β-Si3N4 ceramics prepared by pressureless-sintering compositions in the Si-Re-O-N quaternary systems (Re=La, Nd, Sm, Y, Yb)

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31st International Conference on Advanced Ceramics and Composites

作者： Quinlan, Mervin Heard, D. Plucknett, Kevin P. Garrido, Liliana Genova, Luis Materials Engineering Program Department of Process Engineering and Applied Science Dalhousie University 1360 Barrington Street Halifax NS B3J 1Z1 Canada M.B. Gonnet. Pcia De Buenos Aires Argentina IPEN Instituto de Pesquisas Energéticas e Nucleares CCTM Centro de Ciência e Technologia de Materiais Cidade Universitária Travessa R 400 05508-900 São Paulo Brazil

ISBN: (纸本)9780470196403

It has recently been demonstrated that porous β-Si3N 4 can be engineered to provide similar mechanical properties to dense β-Si3N4, with the additional benefits of reduced mass. Porous p-Si3N4 applications could potentially include filtration media, thermal shock resistant components and high-strength, lightweight structural components. Prior work in Japan has shown that flexural strengths exceeding 1 GPa can be achieved by tailoring the microstructure of the β-Si3N4 grains, such that moderately high aspect ratios are obtained after sintering (up to 10:1) with considerable anisotropic grain alignment, while maintaining porosity levels of ∼10-15 %. In the present study, β-Si3N4 ceramics containing higher porosity levels are generated via pressureless sintering in a nitrogen atmosphere, with the addition of single rare earth oxide sintering aids. The oxide additives have been chosen from both the lanthanide (La, Nd, Sm, Yb) and Group IIIB (Y) elements. In each case, the compositions were milled for 24 hours, cold isostatically pressed and then sintered in nitrogen (0.1 MPa) at temperatures ranging from 1500 to 1750°C. Post sinter microstructural characterization was performed using scanning electron microscopy and x-ray diffraction. It is noted that densification and phase transformation kinetics are both strongly influenced by the oxide chosen.

关键词： X ray diffraction

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Compositional design of porous β-Si3N4 prepared by pressureless-sintering compositions in the Si-Y-Mg-(Ca)-O-N system

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31st International Conference on Advanced Ceramics and Composites

作者： Quinlan, Mervin Plucknett, Kevin P. Garrido, Liliana Genova, Luis Materials Engineering Program Department of Process Engineering and Applied Science Dalhousie University 1360 Barrington Street Halifax NS B3J 1Z1 Canada M.B. Gonnet. Peia. De Buenos Aires Argentina IPEN Instituto de Pesquisas Energéticas e Nucleares CCTM Centro de Ciência e Technologia de Materiais Cidade Universitária Travessa R 400 05508-900 São Paulo Brazil

ISBN: (纸本)9780470196403

Porous β-Si3N4 can be microstructurally engineered to provide similar mechanical properties to dense β-Si 3N4 with the additional benefits of reduced mass. However, while flexural strengths exceeding 1 GPa can be achieved by tailoring the microstructure of the material, through alignment of anisotropic β-Si 3N4 grains, the porosity levels of such materials are still relatively low (3N4 structure (ideally 20-40 vol. % porosity) with high grain aspect ratios (i.e. >10:1). This approach makes use of a low volume fraction of multiple sintering aids, where each additive plays one or more roles in the sintering behavior of Si3N4 (i.e. densification aid, transformation aid and/or whisker growth aid). Compositions are based on various ratios of Y2O3:MgO, both with and without CaO additions. Sintering has been conducted in a nitrogen atmosphere (0.1 MPa) between 1400 and 1700°C. The effects of processing parameters (e.g. composition, sintering temperature and time) will be discussed, paying particular attention to microstructure development, including both the densification behavior and α- to β-Si3N4 transformation kinetics.

关键词： Silicon compounds

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Fatigue properties of high pressure die-cast magnesium AM60B alloy

Fatigue properties of high pressure die-cast magnesium AM60B...

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2007 World Congress

作者： Lu, Y. Taheri, F. Gharghouri, M. Materials Engineering Program Department of Process Engineering and Applied Science Dalhousie University Halifax NS B3J 2X4 Canada National Research Council Canada Canadian Neutron Beam Centre Chalk River Laboratories Chalk River ON K0J 1J0 Canada Department of Civil Engineering Dalhousie University 1360 Barrington Street Halifax NS B3J 1Z1 Canada

Magnesium castings are experiencing increased use in the transportation industry because of their high strength to weight ratio, high stiffness, and excellent castability. The casting characteristics allow complicated shapes to be cast to close tolerances with high reproducibility. As the use of magnesium castings increases, the need for research on this alloy is becomes more prevalent. Indeed, little research has been performed on magnesium alloys compared to aluminum castings. In the present study, the influence of the microstructure in a high pressure die casting AM60B magnesium auto component is investigated. Fatigue samples were removed from the component. Staircase fatigue testing was conducted first and the fracture surfaces were then examined with the scanning electron microscope. It was found that the majority of fatigue cracks initiated from sub-surface voids underneath machined surfaces, not the cast skins. Machining a specimen out of a casting causes internal voids to become sub-surface voids, which in turn causes premature fracture. In the region which is close to the fracture initiation site, extremely flat areas covered with fine fatigue striations can be easily observed. However, numerous randomly oriented serrated surfaces, indicative of rough fatigue crack growth were found near the regions farther away from the initiation site. Finally, the final fracture zone is characterized by a high level of porosity and dimples surrounding second phase particles. Copyright © 2007 SAE International.

关键词： Microstructure

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Synthesis and Catalytic Applications of Novel Mesoporous Aluminosilicate Molecular Sieves

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MRS Online Proceedings Library 1996年第1期454卷 125-137页

作者： Kondam Madhusudan Reddy Chunshan Song Laboratory for Hydrocarbon Process Chemistry and Fuel Science Program Department of Materials Science and Engineering The Pennsylvania State University University Park

This paper reports on the synthesis of four series of mesoporous aluminosilicate molecular sieves (Al-MCM-41) and their catalytic applications. Four different aluminum compounds were examined as Al source in the hydrothermal synthesis of the mesoporous aluminosilicates of MCM-41 type, including pseudo boehmite (alumina), aluminum sulfate, aluminum isopropoxide, and sodium aluminate. Each Al source was examined at three different feed Si/Al ratios in the synthesis. XRD results show that there are differences in the dioo-spacings for the samples prepared with different Al sources: sodium aluminate > Al isopropoxide > Al sulfate > pseudo boehmite. Such differences reveal that Al incorporation in the framework increases in the following order: pseudo boehmite < Al sulfate < Al isopropoxide < sodium aluminate. XRD also indicates that the synthesized Al-MCM-41 samples have different crystallinity. 27Al NMR and 29Si NMR reveal that most of the Al species in the samples prepared with pseudo boehmite were present in octahedral coordination, whereas in other samples nearly all the Al species are tetrahedral (in the framework). The acid characteristics of the synthesized molecular sieves were characterized by temperature-programmed desorption of n-butylamine, and by using 1,3,5-triisopropylbenzene hydrocracking as probe reaction. The results of TPD and probe reaction clearly indicate that the Al source used for synthesis has a major impact on the acidic and catalytic properties of Al-MCM-41. The samples prepared with Al isopropoxide and sodium aluminate are better as catalysts than those with Al sulfate and pseudo boehmite. We also explored the potential of mesoporous molecular sieves as support for noble metal hydrogenation catalysts and metal sulfide-based hydrotreating catalysts. Pd and Pt-loaded mesoporous molecular sieves were prepared and applied for hydrogenation of naphthalene and phenanthrene. The results show that mesoporous molecular sieve-supported catalysts are mu

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LASER CLADDING REFURBISHMENT OF CATAPULT TROUGH COVERS

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NAVAL ENGINEERS JOURNAL 1993年第6期105卷 69-75页

作者： DENNEY, PE LOWRY, RW Paul E. Denney:has been involved with high-powered laser materials processing for over eight years. Mr. Denney received both his BS and MS degrees in metallurgy from MIT in 1980. He was employed for one year by CF&I Steel of Pueblo Colo. before joining the Naval Research Laboratory in Washington D.C. where he was involved with failure analyses and laser materials processing. From 1985 to 1988 Mr. Denney conducted laser materials processing at the Westinghouse Research and Development Center in Pittsburgh Pa. Since 1988 he has been at the Applied Research Laboratory at Pennsylvania State University (ARL Penn State) where he has assisted in the development of the laser metalworking technology transfer facility (in Johnstown Pa.) and the laser processing group within the ARL Penn State Manufacturing Science Department. Mr. Denney directs laser and other advanced thermal processing programs for the Navy Army and many private industrial sponsors. Robert W. Lowry:graduated from Virginia Polytechnic and State University with BS and MS degrees in metallurgical engineering in 1967. He has worked at the Naval Surface Warfare Center for 30 years and has been involved with laser process technology since 1979. Mr. Lowry has worked in fragmentation studies failure analysis materials testing and been associated with such Navy programs as Vertical Launch Standard Missile Guided Projectile and the In-Service Manufacturing Technology Advisory Group (MTAG) Metals Subcommittee. He has submitted two patent applications in laser processing and is current manager of NSWC's high power laser facility. Current emphasis is on laser welding for missile structures. Mr. Lowry has recently been selected as a participant in the Navy Science Advisory Program (NSAP) as a technical advisor at CinCLantFlt Norfolk for fleet maintenance.

A laser cladding process has been developed and is now in production for the cladding of new aircraft carrier catapult components. The Service Life Extension program (SLEP) Office of Naval Sea Systems Command (NavSea) suggested that this process be utilized for the refurbishment of catapult tracks. Early experiments were conducted by the Naval Surface Warfare Center in conjunction with the IIT Research Institute. The program was then transitioned to the Applied Research Laboratory, Pennsylvania State University (ARL Penn State) under the sponsorship of the Naval Air Systems Command (NavAir)/Navy MANTECH program, thus providing an effective solution to a NavSea/NavAir interface hardware problem. ARL Penn State was responsible for the production and evaluation of six laser clad aircraft carrier catapult tracks as part of a program sponsored and funded by NavAir Code 5512. Six catapult tracks that had been taken out of service because of excessive wear were laser clad at the Westinghouse Electric Research and Development Center (Now ''science and Technology Center'') for ARL Penn State. The composition of the clads was Inconel 625, Stellite 6/Stainless Steel 304, and Ferrelium 255. The tracks were machined and installed on the USS Constellation. Wear measurements were taken for the laser clad tracks and standard tracks ahead and behind the clad tracks. After 7,161 launches, the tracks were removed and returned to ARL Penn State for evaluation. The evaluation indicated that impact damage was observed on one track. No additional defects related to operations were found. Wear data indicated that the wear rate for it was 25%-50% less than non-clad. The results indicated that rejectable tracks (and one piece trough covers) could be successfully laser clad for extended operating life at acceptable costs. With emphasis for the future on a more affordable Navy, the need for viable refurbishment processes will be necessary for extending life and performance for the 21st century

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ELASTOHYDRODYNAMICS OF BLADE COATING

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AICHE JOURNAL 1990年第4期36卷 587-597页

作者： PRANCKH, FR SCRIVEN, LE Coating Process Fundamentals Program Department of Chemical Engineering & Materials Science University of Minnesota Minneapolis MN 55455

Blade coating is the most common method of coating paper, and it is applied in coating magnetic suspensions and adhesives. Typically, the blade's upstream edge is clamped into a rigid holder so that the blade and substrate form a converging wedge. The translating substrate drags liquid into the wedge, where liquid forces develop and deflect the elastic blade, but it is loaded externally to counteract the deflection. Liquid dragged past the blade and thus the coating thickness depend on the elastohydrodynamic interaction among blade, liquid, and loading. Shell theory and lubrication flow theory describe the interaction by means of differential equations that are shown to be equivalent to Saita and Scriven's (1985) earlier formulation but that lead to a computationally more efficient analysis. Predictions computed agree with those of the earlier formulation and with experiments. Moreover, the new predictions illustrate effects of normal force loading and broaden the theory of blade coating.

关键词： Coating Techniques

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