检索结果-内蒙古大学图书馆

作者： Wong, Chee Yong Chen, Shi-Kun Lo, An-Ya Tseng, Chuan-Ming Lin, Chiu-Yue Liu, Shang-Bin Department of Materials Science and Engineering Fong Chia University Taichung 40724 Taiwan Green Energy Development Center and Master's Program of Green Energy Science and Technology Fong Chia University Taichung 40724 Taiwan Institute of Physics Academia Sinica Taipei 11529 Taiwan Institute of Atomic and Molecular Sciences Academia Sinica Taipei 10617 Taiwan Department of Chemistry National Taiwan Normal University Taipei 11677 Taiwan

A comprehensive study has been made to explore the role of organic acids on electrocatalytic performances of platinum (Pt) nanoparticles supported on carbon porous materials (CPMs) in proton exchange membrane fuel cells (PEMFCs). In particular, the effects of carboxylic acids (R-COOH), viz. formic acid, acetic acid, propionic acid, and butyric acid on catalytic activity, stability, and durability of anodic Pt/CPM electrocatalyst in direct methanol fuel cells (DMFCs) were investigated. In the presence of doped carboxylic acids, the electrooxidative activity of Pt/CPM follows the trend: HCOOH 3COOH 2H5COOH 3H 7COOH, revealing a consistent increase in the severity of catalyst deactivation with the number of carbons on the alkyl chain of the dopant. The Pt/CPM was found to exhibit electrocatalytic performances and tolerance for poisoning than a commercial Pt/XC-72 catalyst with a similar Pt loading (20 wt%). Moreover, a notable increase in mass activity up to ca. 150% over the spent Pt/CPM catalyst was observed up on removing the organic acid in the feed stream, indicating that catalyst poisoning by deactivation may be revived, even to its "intrinsic" activity. © 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

关键词： Electrocatalysts

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Voltage holding ratio of a nematic liquid crystal cell under UV exposure

Voltage holding ratio of a nematic liquid crystal cell under...

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2010 Photonics Global Conference, PGC 2010

作者： Tang, Chen-Yu Lin, Yu-Chun Lee, Wei Master Program in Nanotechnology Chung Yuan Christian University Chung-Li 32023 Taiwan Department of Electronic Engineering Chung Yuan Christian University Chung-Li 32023 Taiwan Department of Physics Center for Nanotechnology Chung Yuan Christian University Chung-Li 32023 Taiwan

ISBN: (纸本)9781424498826

This study uses the time-evolved voltage holding ratio (VHR) to measure the influence of UV exposure on a nematic liquid-crystal cell. Apart from the real-time measurement during the exposure, the time-dependent recovery of VHR is also monitored after a certain amount of UV irradiation. Our experimental results show that the cell impregnated with an adequate content of the anatase TiO2 as a nano-additive possesses a higher VHR, which unambiguously implies that the TiO2 nanoparticles are capable of preventing the serious ion effect caused by the harmful UV. Achieving the "green" concept, this research suggests a new approach to reduce the ion effect and extend the life of LCD devices under sunlight.

关键词： Titanium dioxide

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Voltage holding ratio of a nematic liquid crystal cell under UV exposure

Voltage holding ratio of a nematic liquid crystal cell under...

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IEEE PhotonicsGlobal@Singapore, IPGC

作者： Chen-Yu Tang Yu-Chun Lin Wei Lee Master Program in Nanotechnology Chung Yuan Christian University Chung-Li Republic of China Department of Electronic Engineering Chung Yuan Christian University Chung-Li Republic of China Departrnent of Physics and Center for Nanotechnology Chung Yuan Christian University Chung-Li Republic of China

This study uses the time-evolved voltage holding ratio (VHR) to measure the influence of UV exposure on a nematic liquid-crystal cell. Apart from the real-time measurement during the exposure, the time-dependent recovery of VHR is also monitored after a certain amount of UV irradiation. Our experimental results show that the cell impregnated with an adequate content of the anatase TiO 2 as a nano-additive possesses a higher VHR, which unambiguously implies that the TiO 2 nanoparticles are capable of preventing the serious ion effect caused by the harmful UV. Achieving the "green" concept, this research suggests a new approach to reduce the ion effect and extend the life of LCD devices under sunlight.

关键词： Liquid crystals Voltage measurement Ions Radiation effects Liquid crystal displays Nanoparticles

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The engineer as entrepreneur: Education for the 21st century at Rose-Hulman institute of technology

The engineer as entrepreneur: Education for the 21st century...

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2001 ASEE Annual Conference and Exposition: Peppers, Papers, Pueblos and Professors

作者： Mason, Thomas W. Western, Arthur B. Rose-Hulman Institute of Technology Entrepreneurship/Bus. P. Rose-Hulman Rose-Hulman Institute of Technology Terre Haute IN Institute's Master of Science Engineering Management Program Department of Physics Fac. Rose-Hulman Inst. of Technol.

Over the past five years, Rose-Hulman has invested over $40M dollars creating an environment to encourage entrepreneurship in its graduates. Components of the educational, organizational, and physical infrastructure are described. These components include a course in entrepreneurship, internships with entrepreneurial companies, the Technology and Entrepreneurship Development (TED) program, Rose-Hulman Ventures (RHV), and the John T. Myers Center for Technological Research with Industry. Case studies of recent successes are presented.

关键词： engineering education

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Developing a prototype concurrent design tool for composite topside structures

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NAVAL ENGINEERS JOURNAL 1997年第3期109卷 279-290页

作者： Dirlik, S Hambric, S Azarm, S Marquardt, M Hellman, A Bartlett, S Castelli, V Steve Dirlik:began his career at the Naval Surface Warfare Center Carderock Division in 1981 as an aerospace engineer co-op student. He completed his bachelor of science degree in aeropace and ocean engineering from Virginia Polytechnic Institute and State University in 1985 and his master of science degree in aerospace engineering from the University of Maryland in 1990. Mr. Dirlik recently completed a master of science program in applied physics at The Johns Hopins University and currently works in the Radar Cross Section and Target Physics Branch of the Signatures Directorate at the Naval Surface Warfare Center Corderoke Division. He has worked on Navy low observable programs since 1990. Stephen Hambric:is a research associate at the Applied Research Laboratory at The Pennsylvania State University. He received his B. S. and M.S. degree in mechanical engineering from Virginia Polytechnic Institute and State University and his D. Sc. in mechnical engineering from the George Washington University. He has worked on several computer aided multidiscikplinary design and optimization projects over the years including an automated propeller design system and a structural acoustic optimization capability. Dr. Shpour Azarm:is currently working as an associate professor with the Design and Manufacturing Group of the Department of Mechanical Engineering at the University of maryland at College Park. Dr Azarm's expertise is in the areas of optimization-based designed and concurrent design and optimization of multidisciplinary systems. He was a consultant at Black & Decker Corporation (summer 1996) and worked as a Navy senior summer faculty fellow (summer 1995) and a NASA summer faculty fellow (summer 1994). He was a visiting scientist at NASA Langley Research Center for Multidisciplinary Analysis and Applied Structural Optimzatiom at the University of Siegen in Germany (spring 1992) and the Design Institute of the Technical University of Denmark (summer 1990). Dr Azarm was an associate technical editor of the ASME Jour

A prototype concurrent engineering tool has been developed for the preliminary design of composite topside structures for modern navy warships. This tool, named GELS for the Concurrent engineering of Layered Structures, provides designers with an immediate assessment of the impacts of their decisions on several disciplines which are important to the performance of a modern naval topside structure, including electromagnetic interference effects (EMI), radar cross section (RCS), structural integrity, cost, and weight. Preliminary analysis modules in each of these disciplines are integrated to operate from a common set of design variables and a common materials database. Performance in each discipline and an overall fitness function for the concept are then evaluated. A graphical user interface (GUI) is used to define requirements and to display the results from the technical analysis modules. Optimization techniques, including feasible sequential quadratic programming (FSQP) and exhaustive search are used to modify the design variables to satisfy all requirements simultaneously. The development of this tool, the technical modules, and their integration are discussed noting the decisions and compromises required to develop and integrate the modules into a prototype conceptual design tool.

关键词： Warships

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Operational systems, logistics engineering and technology insertion

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NAVAL ENGINEERS JOURNAL 1997年第3期109卷 205-220页

作者： Grubb, MJ Skolnick, A Michael J. Grubb:has perfomzed naval engineering at the Crane Division Naval Surface Warfare Center (NSWC) for more than twenty-five years. He currently the program manager for the Sustainable Hardware and Affordable Readiness Practice Program (SHARP). is a Navy-wide logistics research and development prgram aimed at the successful transiton of proved technologies inot the fleet. SHARP focuses on reducing acquisition performance capability reliability maintainability and readiness of these systems. Mr. Grubb has served as a department director for the past eleven years. His most recent assignment was as director of the Tactical Computer Resources and Test Equipment Department. This organization provided acquisition and in-service engineering support of the Navy's tectical embedded computers priphirals displays and mass memory storage devices. The organization also provided a complete range of product engineering and metrology engineerig services for SSP NevSeaSysCom and the Trident Program. Prior to this appointment Mr. Grubb was deptuy director psysical security programs department and site responsible for program management and system integration of ashore integrated security systems. Mr. Grubb holds a B.S. degree in industrial engineering from Iowa State Universtiy an M.S. degree in industrial engineering from Purdue University and has copleted the course work (Dec.'96 for a master's degree in public and environment affairs at Indiana University-Purdue Univeristy Indianapolis. Dr. Alfred Skolnick operates System Science Consultants (SSC) specilizing in strategic planning technical program definiton technology assessment and engineering analyses on selected matters of national interest. He has taught physics mathematics and management sciences at University of Virginia and Marymount University and is currently adjunct professor of mathematics at Northern Virginia Community College. Form 1985 to 1989 he was president of the American Society of Noval Engineers. Dr. Skolnick served at Applied Physic

In an era of fiscal austerity, downsizing and unforgiving pressure upon human and economic capital, it is an Augean task to identify resources for fresh and creative work. The realities of the day and the practical demands of more immediate fleet needs can often dictate higher priorities. Yet, the Navy must avoid eating its seed corn. Exercising both technical insight and management foresight, the fleet, the R&D community, the Office of the Chief of Naval Operations (OpNav) and the product engineering expertise of the Naval Surface Warfare Center (NSWC) are joined and underway with integrated efforts to marry new, fully demonstrated technologies and operational urgencies. Defense funding today cannot sponsor all work that can be mission-justified over the long term because budgets are insufficient to support product maturation within the classical development cycle. However, by rigorous technical filtering and astute engineering of both marketplace capabilities and currently available components, it is possible in a few select cases to compress and, in effect, integrate advanced development (6.3), engineering development (6.4), weapon procurement (WPN), ship construction (SCN), operation and maintenance (O&M,N) budgetary categories when fleet criticalities and technology opportunities can happily meet. In short, 6.3 funds can be applied directly to ''ripe gateways'' so modern technology is inserted into existing troubled or aging systems, sidestepping the lengthy, traditional development cycle and accelerating practical payoffs to recurrent fleet problems. To produce such constructive results has required a remarkable convergence of sponsor prescience and engineering workforce excellence. The paper describes, extensively, the philosophy of approach, transition strategy, polling of fleet needs, technology assessment, and management team requirements. The process for culling and selecting specific candidate tasks for SHARP sponsorship (matching operational need with t

关键词： Naval vessels

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Architecting a missile system for navy theater ballistic missile defense

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NAVAL ENGINEERS JOURNAL 1997年第3期109卷 373-380页

作者： Patel, A Kjos, K Sasso, F Robinson, S Anant Patel:is senior project engineer for the Standard Missile LEAP Progrma (desgnated SM-X) in the Standard Missile/Vertical Launch System Program Office (PMS 422) of the Navy's Program Executive office for Theater Air Defense (PEO TAD). He is responsbile for the integration and test of the SM-X missile including the third stage rocket motor (TSRM) and the kinetic warhead (KW) assemblies. He received his bachelor of science in electrical engineering from the University of Pittsburgh in 1985 Prior to joining PMS 422 he was the project engineer for the shipboard targeting system used during the Terrier LEAP technology demonstration program. he was also tht project manager for the installation and integration of the new threat upgrade (NTU) and cooperative engagement capabilities (CEC) aboard USS Kidd (DDG 993) the first ship to receive CEC during its development test phase. Mr. Patel's other assignments as NTU development lead engineer uncluded providing development and technical direction for modifications to the NTU engagement system for Standard Missile II and III/IIIA compability. kathrin Kjos:is the program development team leader for Hughes Missile Systems Company. She worked on the initial flight demonstraction phase of the program integrating the kill vehicle and advanced solid axial stage into the SM2 Block III ER missile and served as co-chair of the System Safety Working Group. She has thirteen years of experience in system engineering. Previous experience includes missile systems engineering for the Advanced Air-to-Air Missile (AAAM) as well as for laser and radar surveillance systems. She has a bachelor of science degree in chemical engineering from the Illinois Institute of Technology a master of science degree in system engineering from the University of Southern California and is currently a doctoral candidate in systems architecting at the University of Southern California. Felix Sasso is a member of technical staff 11 at Hughes Missile System Company. He has three years of experience in op

While most of the theater ballistic missiles (TBM) in threat countries' inventories are of the shorter range SCUD varieties, mid- to long-range versions are currently in development in a number of third world countries. Threat potential exists in the following three battle spaces: endo-atmosphere (0-30 km), high endo-atmosphere (30-70 km) and exo-atmosphere (greater than 70 km). The inherent short range and low speed of endo-atmospheric threats match well with capabilities of SM-2 Block IVA, which equips the Navy with an area defense capability The exo-atmospheric TBMs are longer range and can threaten more targets which may be widely dispersed. Their higher velocities reduce response times dramatically Therefore, exo-atmospheric TBMs create the need for Standard Missile-3 (SM-3), which provides the Navy with theater wide defense capability. Defining its area and theater wide systems as clearly endo-atmospheric and exo-atmospheric systems allows the Navy to use derivatives of the Standard Missile Block IV to take full advantage of the conditions associated with each of these operating zones. Use of an existing missile and ship system baseline also allows use of the existing interface structure to minimize cost. To counter the endo-atmospheric TBMs, the SM-2 BLK TVA upgrades include an advanced imaging infrared (IIR) seeker, an improved fast-reaction auto pilot and a forward looking RE all in the same volume as the existing missile. The highly responsive SM-2 Block IVA missile, complemented with Aegis weapons systems modifications, provides capability against enemy aircraft and cruise missiles, as well as TBMs. Standard Missile-3 (SM-3) replaces the SM-2 Block TV warhead, radar and guidance section with a boosted third stage and an advanced kinetic warhead (KW). Operation in the exo-atmospheric region permits a KW design with autonomous guidance control and divert thrusters for high maneuverability and has the capability of achieving very high interceptor velocities.

关键词： Missiles

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Examination of photodoping phenomenon by in-situ ellipsometric observation

Examination of photodoping phenomenon by in-situ ellipsometr...

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17th Congress of the International-Commission-for-Optics - Optics for Science and New Technology

作者： Lee, J Ogawa, T Wakaki, M Miyanishi, Y Kawabata, S Department of Physics Kunsan National University South Korea Institute of Applied Physics University of Tsukuba Japan Department of Electro-Photo-Optics Engineering Tokai University Japan Master's Program in Education University of Tsukuba Japan Faculty of Engineering Tokyo Institute of Polytechnics Japan

Phenomenon due to Ag photodoping into amorphous As2S3 was examined with an ellipsometric method. Obtained values of ellipsometric parameters ψ and Δ were fitted by using multilayer model. It was found that each thic... 详细信息

ISBN: (纸本)0819421642

Phenomenon due to Ag photodoping into amorphous As₂S₃ was examined with an ellipsometric method. Obtained values of ellipsometric parameters ψ and Δ were fitted by using multilayer model. It was found that each thickness of Ag, Ag: As₂S₃ and As ₂S₃ layers showed a time dependent change during the diffusion process in photodoping and the optical constants of As ₂S₃ change remarkably by Ag photodoping. These behaviors were explained in relation with photodoping mechanism. Copyright © 1996. The Society of Photo-Optical Instrumentation Engineers.

关键词： Silver

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Waveguiding properties of As2S3 optical waveguide doped with ag by photodoping technique

Waveguiding properties of As2S3 optical waveguide doped with...

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17th Congress of the International Commission for Optics: Optics for Science and New Technology, ICO 1996

作者： Ogawa, Tsutomu Wakaki, Moriaki Tatumi, Shunpei Miya-Nishi, Yuka Lee, Jaeman Institute of Applied Physics University of Tsukuba Japan Department of Electro-Photo-Optics Engineering Tokai University Japan Master's program in Education University of Tsukuba Japan Department of Physics Kunsan National University Korea Republic of

ISBN: (纸本)0819421642

Amorphous As2S3 shows a remarkable volume expansion and an increase of refractive index by the diffusion of Ag. The feasibilty of application of Ag photodoping effect to the fabrication of micro optical elements in an As2S3 waveguide was investigated. It was found that a small Ag doped area and a small amount of Ag doping had large effects on waveguiding Properties. Copyright © 1996. The Society of Photo-Optical Instrumentation Engineers.

关键词： Silver

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Degradation mechanism of contact resistance during window formation

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ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS 1996年第1期79卷 93-100页

作者： Sekine, M Kakuhara, Y Kikkawa, T Nonmember NEC ULSI Device Development Laboratory Sagamihara Japan 229 Graduated in 1985 from Department of Metal Materials Osaka University where he received his Master's degree in 1988. He joined NEC in 1988. Graduated in 1984 from the Department of Electrical Engineering Aoyama Gakuin University and she received her Master's degree from Shinshu University in 1986. She joined NEC in 1986. She is a member of the Applied Physics Society. Graduated in 1974 from the Department of Electrical Engineering Shizuoka University where he received his Master's degree in 1976. He received his Ph.D. degree from Tokai University. He joined NEC in 1976. He is engaged in research and development of semiconductor LSI device and process. He was a Visiting Researcher at MIT from 1983 to 1984. He is currently a director of multilayer wire formation program ULSI Device Development Institute. He is a member of IEEE ICS and Applied Physics Society.

This paper describes a contact degradation mechanism during window formation followed by selective tungsten chemical vapor deposition (W-CVD). Contact resistances by using selective W-CVD were increased as the overetching rate increased. Surface analysis made it clear that the Si surface at the bottom of contact was damaged and oxygen atoms from dielectrics were introduced during window etching. These damage and oxygen atoms break Si-Si bonds and make Si-O bonds after additional ion implantation. The Si-O bonds degrade the valence-band density of states of the Si surface. Such a damaged surface will not react with WF6. This inactivation is the reason for contact degradation. Controlling the Si surface state by using the chemical dry etching (CDE) technique solves this problem.

关键词： selective W-CVD contact chemical dry etch

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