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作者： Sasaki, A. Tezuka, N. Jiang, L. Sugimoto, S. Department of Materials Science Graduate School of Engineering Tohoku University 6-6-02 Aobayama Sendai 980-8579 Japan Global COE Program Material Integration Tohoku University Sendai Japan

We investigated postannealing temperature dependence of the structural and magnetic properties of Co2Ti0.5Mn0.5Al and Co2Ti0.5Mn0.5Si films. It was observed that the Co2Ti0.5Mn0.5Al film formed an ordered L2 1 structure and an ordered B2 structure after postannealing at above 873 K and below 773 K, respectively. The Co2Ti0.5Mn 0.5Si film deposited with substrate heating at above 473 K formed an ordered L21 structure. The obtained magnetoresistance ratio for a junction using an L21 ordered Co2Ti0.5Mn 0.5Si electrode was 12.5 at room temperature (RT). The estimated spin polarization of the Co2Ti0.5Mn0.5Si film was 0.14 at RT. The magnetoresistance ratios of a junction using a B2 ordered Co2Ti0.5Mn0.5Al electrode were 65.8 at RT and 128.4% at 7 K. The estimated spin polarizations of the Co2Ti 0.5Mn0.5Al film were 0.56 at RT and 0.78 at 7 K. © 2011 American Institute of Physics.

关键词： Room temperature

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Computer simulation of the direct iron reduction in MIDREX ovens

Computer simulation of the direct iron reduction in MIDREX o...

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35th International Symposium of Application of Computers and Operations Research in the Minerals Industry, APCOM

作者： Silva, A.C. Bernardes, A.T. Mining Engineering Department Federal University of Goias Campus Catalao Catalao GO 75704-020 Brazil Physics Department Federal University of Ouro Preto Ouro Preto MG 35400-000 Brazil Material Engineering Graduate Program REDEMAT Federal University of Ouro Preto Ouro Preto MG 35400-000 Brazil

ISBN: (纸本)9781921522512

Using the cellular automata computational technique it was possible to simulate the generation and discharge of an iron ore pellet pile inside a direct iron reduction oven, as well as to calculate the reduction degree of the pellets as they leave the oven. It allows simulation of the variation of operational parameters and verify the results of those variations in the pellet reduction degree. The simulated data was validated in two instances: for the dynamics of the pellet flow inside the oven it was used in an acrylic bi-dimensional silo;and data from direct reduction iron literature was used for validation of the pellet reduction. The simulated results were considered acceptable to describe the movement of the iron pellet inside the direct reduction iron oven and to describe the iron pellet reduction direct in the oven.

关键词： Iron ores

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Accelerated oxidation of silicon due to x-ray irradiation

Accelerated oxidation of silicon due to x-ray irradiation

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European Conference on Radiation and its Effects on Components and Systems (RADECS)

作者： Shweta Bhandaru En Xia Zhang Daniel M. Fleetwood Robert A. Reed Robert A. Weller Sharon M. Weiss Interdisciplinary Graduate Program in Material Science Vanderbilt University Nashville TN USA Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN USA

Enhanced rates of oxide growth have been observed on silicon when exposed to high-energy x-ray irradiation. This observed effect could potentially be utilized for remote total ionizing dose-sensing applications.

关键词： Silicon Radiation effects Oxidation Atomic measurements Temperature measurement Optical sensors Atomic layer deposition

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Responses of human fetal mesenchymal stem cells to various poly(Ε-caprolactone) films: A comparison study

Responses of human fetal mesenchymal stem cells to various p...

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2011 Defense Science Research Conference and Expo, DSR 2011

作者： Wang, Zu-Yong Jing, Lim Zhang, Qin-Yuan Teo, Erin Y. Chan, Jerry Hong, Ming-Hui Wen, Feng Teoh, Swee-Hin Department of Mechanical Engineering National University of Singapore Singapore Department of Obstetrics and Gynaecology National University of Singapore Singapore Department of Reproductive Medicine KK Women's and Children's Hospital Singapore Cancer and Stem Cell Biology Program Duke-NUS Graduate Medical School Singapore Department of Electrical and Computer Engineering National University of Singapore Singapore School of Material Science and Engineering Nanyang Technology University Singapore National University of Singapore Singapore

ISBN: (纸本)9781424492763

Poly(Ε-caprolactone) (PCL) films have been applied for vascular tissue engineering. However, few studies studied the effects of fabrication process of PCL film on vascular cell proliferation. In this study, we used different processing methods, incorporating stretching, to fabricate various PCL films. Thickness of films before and after stretch and proliferation ability of human fetal mesenchymal stem cells (hfMSCs) on these films were investigated. Our results showed that stretching significantly reduces the thickness of solvent cast, heat press and cast stretch films (0.22, 0.59, 0.60, p

关键词： Cell proliferation

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Micromachined anti-scatter grid fabricated using crystalline wet etching of (1 1 0) silicon and metal electroplating for X-ray imaging

Micromachined anti-scatter grid fabricated using crystalline...

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作者： Jeong, Dae-Hun Myung Kim, Jae Noh, Do Young Hyun Kim, Kwang Lee, Jong-Hyun 261 Cheomdan-gwagiro Buk-gu 500-712 Gwangju Korea Republic of School of Material Science and Engineering GIST 261 Cheomdan-gwagiro Buk-gu 500-712 Gwangju Korea Republic of Department of Biomedical Engineering Jungwon University #5 Goesan-eup Goesan-gun 367-805 Chungcheongbuk-do Korea Republic of Graduate-program of Medical System Engineering GIST 261 Cheomdan-gwagiro Buk-gu 500-712 Gwangju Korea Republic of

Two-dimensional micromachined anti-scatter grids were fabricated using MEMS technology, including crystalline wet etching of (1 1 0) silicon and metal electroplating for X-ray imaging. The core sizes of the square grids were 100, 200, and 300 μm with 2.2 mm height and 50 μm septa thickness. To prepare the etch mask for crystalline wet etching, silicon nitride was deposited using low pressure chemical vapor deposition (LPCVD). The grid patterns, which are aligned parallel to the vertical (1 1 1) plane of the (1 1 0) silicon, were transferred from the photomask onto the photoresist using deep ultraviolet (DUV) photolithography, and consecutively onto the silicon nitride using reactive ion etching (RIE). A (1 1 0) silicon substrate was then etched in a tetramethyl ammonium hydroxide (TMAH) solution to form a skeleton for the septa structure. Chrome was sputtered to provide a seed layer for nickel electroplating, where nickel grows on the sidewalls of the skeleton of the septa structure. Finally, two-dimensional septa with various grid ratios were constructed by cross-stacking several layers of the patterned (1 1 0) silicon wafer. Anti-scattering ability was experimentally characterized in terms of X-ray transmission by one-dimensional scanning of incident angle. © 2010 Elsevier B.V.

关键词： Photoresists

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Applicability of Carbonated Electric Arc Furnace Slag to Mortar

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Journal of Physics: Conference Series 2012年第1期352卷

作者： S Yokoyama R Arisawa M N N Hisyamudin K Murakami A Maegawa M Izaki Department of Mechanical Engineering Toyohashi University of Technology Hibarigaoka Tempaku-cho Toyohashi Aichi 441-8105 Japan Graduate Program of Mechanical Engineering for Master's Degree Toyohashi University of Technology Hibarigaoka Tempaku-cho Toyohashi Aichi 441-8105 Japan Faculty of Mechanical and Manufacturing Engineering University Tun Hussein Onn Malaysia 86400 Parit Raja Batu Pahat Johor Malaysia Research Section of Material Technology Mie Prefecture Industrial Research Institute Takacyaya Tsu Mie 514-0819 Japan

Authors have been studying the absorption of CO2 in the steelmaking slag. In this study, an application of the electric arc furnace slag after the carbonation to admixture of mortar was investigated with the JIS (A6206-1997) method for ground granulated blast-furnace slag for concrete. The percent flows for the test mortar were smaller than that for the standard mortar. The percent flow of the carbonated slag whose average particle size of more than approximately 4 μm increased with an increase in the average size of the particles. Because the compressive strengths of the test mortar cured for 91 days were almost the same as those cured 28 days, the slag after the carbonation was thought not to have self-hardening property for a medium and long term. The compressive strength for the test mortar was almost unchanged within a range of approximately 2 to 7 μm of the average particle size, and it in this range was highest. The activity indexes for the test mortar prepared with the slag after the carbonation ranged from approximately 40 to 60 %.

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Phonon transport and thermoelectricity in defect-engineered InAs nanowires

Phonon transport and thermoelectricity in defect-engineered ...

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2011 MRS Fall Meeting

作者： Weathers, Annie Moore, Arden L. Pettes, Michael T. Salta, Daniel Kim, Jaehyun Dick, Kimberly Samuelson, Lars Linke, Heiner Caroff, Philippe Shi, Li Department of Mechanical Engineering University of Texas at Austin Austin TX United States Material Science and Engineering Graduate Program University of Texas at Austin Austin TX United States Center for Nano and Molecular Science University of Texas at Austin Austin TX United States Division of Solid State Physics Lund University S-22100 Lund Sweden Polymer and Materials Chemistry Lund University S-22100 Lund Sweden Institut d'Electronique de Microelectronique et de Nanotechnologie UMR CNRS 8520 F-59652 Villeneuve d'Ascq France

ISBN: (纸本)9781627482219

There have been reports of improvements in the thermoelectric figure of merit through the use of nanostructured materials to suppress the lattice thermal conductivity. Here, we report on a fundamental study of the combined effects of defect planes and surface scattering on phonon transport and thermoelectric properties of defect-engineered InAs nanowires. A microfabricated device is employed to measure the thermal conductivity and thermopower of individual suspended indium arsenide nanowires grown by metal organic vapor phase epitaxy. The four-probe measurement device consists of platinum resistance thermometers and electrodes patterned on two adjacent SiNx membranes. A nanowire was suspended between the two membranes, and electrical contact between the nanowire and the platinum electrodes was made with the evaporation of a Ni/Pd film through a shadow mask. The exposed back side of the device substrate allows for characterization of the crystal structure of the suspended nanowire with transmission electron microscopy (TEM) following measurement. The 100-200 nm diameter zincblende (ZB) InAs nanowire samples were grown with randomly spaced twin defects, stacking faults, or phases boundaries perpendicular to the nanowire growth direction, as revealed by transmission electron microscopy (TEM) analysis. Compared to single-crystal ZB InAs nanowires with a similar lateral dimension, the thermal conductivity of the defect-engineered nanowires is reduced by fifty percent at room temperature. © 2012 materials Research Society.

关键词： Nanowires

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Phonon Transport and Thermoelectricity in Defect-Engineered InAs Nanowires

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MRS Online Proceedings Library 2011年第1期1404卷 36-43页

作者： Weathers, Annie Moore, Arden L. Pettes, Michael T. Salta, Daniel Kim, Jaehyun Dick, Kimberly Samuelson, Lars Linke, Heiner Caroff, Philippe Shi, Li Department of Mechanical Engineering The University of Texas at Austin Austin USA Center for Nano and Molecular Science The University of Texas at Austin Austin USA Material Science and Engineering Graduate Program The University of Texas at Austin Austin USA The Nanometer Structure Consortium (nmC@LU) and Division of Solid State Physics Lund University Lund Sweden Polymer & Materials Chemistry Lund Sweden Institut d’Electronique de Microelectronique et de Nanotechnologie UMR CNRS 8520 France

关键词： thermoelectric nanostructure thermal conductivity

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Silica nanochannel device for pH sensing based on surface charge density changes

Silica nanochannel device for pH sensing based on surface ch...

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2010 10th IEEE Conference on Nanotechnology, NANO 2010

作者： Lee, Sang Young Yoon, Sang Youl Lee, Kyeong-Hwan Yang, Sung Department of Nanobio Material and Electronics School of Information and Mechatronics GIST Korea Republic of Graduate- Program of Medical System Engineering Biomedical Micro/Nano Device Laboratory GIST Korea Republic of

ISBN: (纸本)9781424470334

This paper demonstrates a novel micro/nano fluidic device for continuous pH sensing of small fluid volumes. The working principle of the device is based on the change of the surface charge density within the silica nano channels with respect to the pH levels of the electrolyte. In order to measure pH levels of various solutions, AC potential is applied along the silica nanochannels which have 50 nm depth, 2 μm width, and 30 μm length. The running current along the nanofluidic channels is directly measured with respect to pH levels. It was found that the running current is inversely proportional to pH levels regardless of ion concentrations. ©2010 IEEE.

关键词： Electrolytes

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A novel fabrication of Cu-Mn alloy films by chemical displacement process

A novel fabrication of Cu-Mn alloy films by chemical displac...

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Copper Interconnects, New Contact Metallurgies/Structures, and Low-K Inter-Level Dielectrics - 214th ECS Meeting

作者： Lin, Li-Min Yang, Wen-Luh Dai, Ming-Jie Yang, Tsong-Jen Yang, Chin-Hao Huang, Fang-Tse Wang, Chin-An Huang, Shin-Yi Graduate Institute of Electrical and Communications Engineering Ph.D. Program Feng Chia University Taiwan Department of Electronic Engineering Feng Chia University Taiwan Department of Material Science Feng Chia University Taiwan P. O. BOX 25-239 Taichung 40724 Taiwan

ISBN: (纸本)9781615672936

The Cu-Mn alloy films have been successfully fabricated by a novel chemical displacement process. The surface morphologies and displacement rate of Cu-Mn with pH values and temperatures are investigated in this paper. Furthermore, this chemical displacement is a selective deposition between Si and SiO 2, this predominance can apply to self-formed metal layer. The chemical displacement process provides a solution to satisfy for 32 nm node Cu-Mn alloy self-formed barrier requirement. ©The Electrochemical Society.

关键词： Manganese alloys

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