检索结果-内蒙古大学图书馆

International Conference on Neural Networks

作者： O. Hoshino Y. Kashimori T. Kambara Department of Information Network Science Graduate School of Information Systems Japan Department of Applied Physics and Chemistry University of Electro-Communications Chofu Tokyo Japan

In order to clarify the neural mechanism by which olfactory features are extracted from mixed odor stimuli, we present a model in which each constituent molecule of odor is encoded into a spatial firing pattern in the olfactory bulb and the order of mixing ratio of the molecule is coded into the order of temporal sequence of the spatial patterns. That is, quality and intensity of each odor are encoded into a limit cycle attractor in the dynamical network of olfactory bulb. It depends on types of temporal fluctuation of constituent odor intensity what kinds of limit cycle attractors are formed under application of mixed odor stimulation. When the fluctuation of each odor in the mixture is independent of those of the other odors, each odor is encoded separately into each attractor. However, some odors with coherent fluctuation are encoded into a single limit cycle attractor, that is, recognized as a single feature.

关键词： Feature extraction Olfactory Neurons Data mining Limit-cycles Fluctuations Computer vision Intelligent networks Information systems physics

来源：评论

学校读者我要写书评

暂无评论

Developing a prototype concurrent design tool for composite topside structures

引用

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

来源：评论

学校读者我要写书评

暂无评论

The Anomalous Diffusion-limited Reaction Kinetics of a Phototrapping Reaction

引用

MRS Online Proceedings Library 1996年第1期464卷 257-262页

作者： Eric Monson Anna L. Lin Raoul Kopelman Applied Physics Program University of Michigan Ann Arbor USA Department of Chemistry University of Michigan Ann Arbor USA

A focused laser beam acts as both a "phototrap", bleaching fluorophore molecules which diffuse into the beam path, and as a confocal probe, detecting the excited, unbleached fluorophore molecules still present in the trap. With this focused laser beam, we observe anomalous asymptotic rate laws similar to those predicted for a diffusion-controlled elementary trapping reaction, A + T → T, in one and two dimensions. One dimensional diffusion-limited trapping kinetics are approached in capillaries with 10 fum diameters while two dimensional diffusion limited trapping kinetics are observed with unstirred samples having a quasi 2-D geometry. In the presence of stirring, the 2-D samples exhibit the classical, constant trapping rate over time.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Ferromagnetism of Pyrimidine - Bridged Copper(II) Complexes

引用

Molecular Crystals and Liquid Crystals 1996年第1期279卷 87-96页

作者： Takayuki Ismda Takashi Nogami Masanori Yasui Fujiko Iwasaki Hiizu Iwamura Naoya Takeda Masayasu Ishikawa Department of Applied Physics and Chemistry The University of Electro-Communications Chofu Tokyo 182 Japan Department of Chemistry Graduate School of Science The University of Tokyo Hongo Bunkyo-ku Tokyo 113 Japan Institute for Solid State Physics The University of Tokyo Roppongi Minato-ku Tokyo 106 Japan

The magnetic measurements of polymeric complexes [L·Cu(hfac)2]n, (L = pyrimidine, 4-methylpyrimdine, and quinazpline) revealed the presence of ferromagnetic interactions among the copper spins. The X-ray crystal-structure analysis of the pyrimidine and quinazoline complexes showed a copper-ligand alternating chain. The ferromagnetic transition of the quinazoline complex was observed at about 0.12 K. Pyrimidine2-Cu(ClO4)2complex was found to be a ferromagnet with a transition temperature of about 10 K.

关键词：

来源：评论

学校读者我要写书评

暂无评论

High-frequency analysis of radiation field excited by incident whispering-gallery mode over concave-to-convex boundary

引用

ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS 1996年第7期79卷 10-21页

作者： Goto, K Ishihara, T National Defense Academy Yokosuka Japan 239 Graduated in 1984 from the Department of Electrical Engineering National Defense Academy where he completed the graduate program in 1989. At present he is a Research Associate. He has been engaged in research on the propagation and scattering of the electromagnetic waves. Received his B.S. (equivalent) degree in Electrical Engineering from the National Defense Academy of Japan in 1970 his M.S. and Ph.D. degrees from the Polytechnic Institute of New York (presently the Polytechnic University) Farmingdale NY in 1975 and 1978 respectively and a Dr. of Eng. degree from Tohoku University Sendai Japan in 1983. From June to December 1978 he was a Research Fellow of the Polytechnic Institute of New York. From January 1979 to March 1982 he was with the Defense Research Center of the Defense Agency. In April 1982 he became a Lecturer at the National Defense Academy. From September 1984 through February 1985 he was a Visiting Scholar at the Polytechnic Institute of New York. In 1985 he became an Associate Professor at the National Defense Academy where he was promoted to Professor in 1990. He has been engaged in research on propagation and scattering of electromagnetic waves and acoustic waves. He is a member of the IEEE the Acoustic Society of Japan the Applied Physics Society and the Ocean Acoustic Society.

An asymptotic method of analysis is studied for the radiation field when the lowest-order whispering gallery (WG) modes propagating from the concave side of the concave-to-convex boundary with a variable radius of curvature are radiated into the free-space on the convex side. The modal ray congruences of the WG mode are radiated into the free space after being converted to geometrical rays. Both the caustics and the shadow boundaries are created in the space. As the expression of the radiated field near the caustic, the modal rays incident into the concave part are used for deriving the physical optics integral. By applying the high-frequency asymptotic analysis in the case of two saddle points closely spaced to the evaluation of the integral, the uniform asymptotic solution was derived. Also, as the radiating field on the sufficiently shadow side of the caustic, the complex ray solution was derived. On the other hand, as the radiating field in the transition region near the shadow boundary caused by the convex region, an asymptotic solution was derived in the form of an extension of the conventional UTD (Uniform GTD) to the case where the geometrical ray converted from the modal ray is incident to the boundary. The numerical results obtained by various asymptotic expressions are compared with the reference solution and the geometrical optics figure drawn by the modal ray tracing. The effectiveness of the asymptotic solution and the propagation and radiation phenomena of the WG mode were derived.

关键词： whispering-gallery mode concave-to-convex boundary radiating field high-frequency asymptotic analysis modal ray

来源：评论

学校读者我要写书评

暂无评论

INFLUENCE OF ION-BOMBARDMENT ON A-SI-H FILMS FABRICATED BY PLASMA CHEMICAL-VAPOR-DEPOSITION

引用

ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS 1995年第2期78卷 70-78页

作者： KATO, I YONEDA, T MATSUSHITA, T Member School of Science and Engineering Waseda University Tokyo Japan 169 Nonmembers Torn Matsushita:received his B.E. degree in 1993 from the Department of Electronic and Communications Waseda University where at present he is in the graduate program engaged in research on microwave plasma chemical vapor deposition. He is a member of the Applied Physics Society.

Plasma parameters of Ar/SiH4 plasma were measured as a function of de bias in a double-tubed coaxial line-type microwave plasma chemical vapor deposition (CVD) apparatus. The results indicate that it is possible to control the ion bombardment energy without affecting either the gas phase reaction or ion flux density incident to the substrate. Hydrogenated amorphous silicon films were deposited as a function of the ion bombardment energy and characteristics of the deposited films were investigated. The results indicate that the ion bombardment improves film density, bonding characteristics of hydrogen, and optical band gap but increases the concentration of dangling bonds due to Ar ion implantation. The ion bombardment not only causes the heating of the films but also induces sputtering and ion implantation.

关键词： PLASMA CVD A-SI, H DC BIAS VOLTAGE SHEATH VOLTAGE ION BOMBARDMENT

来源：评论

学校读者我要写书评

暂无评论

Stochastic Treatment of Adsorbate Local-Potential Effects on Surface-Ion Neutralization

引用

Physical Review Letters 1993年第24期71卷 4075-4075页

作者： Zoran L. Mišković Sydney G. Davison Frank O. Goodman Department of Applied Mathematics University of Waterloo Waterloo Ont. N2L 3G1 Canada Institute of Nuclear Sciences-Vinča Belgrade Department of Physics University of Waterloo Guelph-Waterloo Program for Graduate Work in Physics

The influence of a laterally inhomogeneous electrostatic potential of an adsorbate-covered surface on the resonant charge transfer in ion-surface scattering is investigated by means of the time-dependent Anderson-Newns Hamiltonian. The adsorbate-induced random modulation of the projectile orbital energy level is treated as a stochastic process, and its role in the charge transfer is evaluated analytically, in the Gaussian-process approximation, for low projectile speeds and low surface coverage by alkali atoms.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Bibliography to the Special Issue on Quality Systems in Performance Improvement

引用

Performance Improvement Quarterly 1993年第3期6卷

作者： Mel Silberberg Silberberg Associates Northern Essex Community College (NECC) Haverhill MA in January 1991 to devote himself to issues of education and governmental reform at all levels. A graduate of Harvard College and Boston University he taught high school chemistry and physics before joining the Polytechnic Institute of Brooklyn as graduate research fellow in 1951. He spent twenty years in private sector management and training before returning to public education in 1974 creating a pilot model training program for the state of Massachusetts then serving as the statewide coordinator for training for the Massachusetts Department of Education. Returning to NECC in 1984 he instituted perhaps the first‐in‐the‐country degree program in Total Quality Management for a two‐year public college and became interested in the applications of TQM to the public sector and in particular to education. Melvin is a founding board member of the National Educational Quality Initiative Inc. (NEQI) and of the Massachusetts Municipal Quality Network and a member of OAL/QPC AQP ASQC and the Total Quality Network (AASA). He currently provides consulting and training services primarily to municipalities and educational enterprises.

来源：评论

学校读者我要写书评

暂无评论

HARD X-RAY PHOTOACOUSTIC-SPECTROSCOPY IN CU ALLOYS AND COMPOUNDS

HARD X-RAY PHOTOACOUSTIC-SPECTROSCOPY IN CU ALLOYS AND COMPO...

引用

1991 ULTRASONICS SYMP

作者： TOYODA, T MASUJIMA, T SHIWAKU, H ANDO, M Department of Applied Physics and Chemistry University of Electro-Communications Chofu Tokyo 182 Japan Institute of Pharmaceutical Sciences Hiroshima University Hiroshima 734 Japan Department of Synchrotron Radiation Sciences Graduate University for Advanced Studies Tsukuba Ibaraki 305 Japan Photon Factory National Laboratory for High Energy Physics(KEK) Tsukuba Ibaraki 305 Japan

The hard X-ray spectra of Cu alloys (brass and phosphor bronze) and Cu compounds (CuInSe2, CuO, Cu2O, CuCl, CuBr, and CuI) have been measured at X-ray absorption near-edge structure(XANES) regions with a photoacoustic... 详细信息

The hard X-ray spectra of Cu alloys (brass and phosphor bronze) and Cu compounds (CuInSe₂, CuO, Cu₂O, CuCl, CuBr, and CuI) have been measured at X-ray absorption near-edge structure(XANES) regions with a photoacoustic detector using synchrotron radiation. It is shown that the information derived from XANES is also included in the X-ray photoacoustic spectrum which reflects the heat production processes in these Cu alloys and compounds. However, the results showed that the increases and changes of the photoacoustic signal were different from those of the X-ray absorption coefficient at the photon energy regions. Those differences between the X-ray photoacoustic signal and the X-ray absorption coefficient at the XANES regions suggest the importance of the electron-phonon interaction of those materials. © 1991 IEEE.

关键词： X ray absorption

来源：评论

学校读者我要写书评

暂无评论

FLAMMABILITY AND TOXICITY OF COMPOSITE-MATERIALS FOR MARINE VEHICLES

引用

NAVAL ENGINEERS JOURNAL 1990年第5期102卷 45-54页

作者： SEVART, JL GRIFFIN, OH GURDAL, Z WARNER, GA Jeffrey L. Sevart:is a native of Kansas and a 1985 graduate of Kansas State University with a B.S. in mechanical engineering (magna cum laude). After working as a stress analysis engineer at Boeing Military Airplane Company in Wichita Kans. he attended Virginia Polytechnic Institute and State University and received an M.S. in engineering mechanics in February 1988. He currently resides in Akron Ohio working as a research engineer in tire composites research at The Goodyear Tire and Rubber Company. O. Hayden Griffin Jr.:received his B.S. and M.S. in mechanical engineering from Texas Tech University in 1970 and 1971 respectively. He received his Ph.D. in engineering mechanics from Virginia Polytechnic Institute and State University in 1980. Prior to joining the faculty of Virginia Polytechnic Institute and State University as associate professor of engineering science and mechanics in September 1985 he was employed at the U.S. Naval Surface Warfare Center (Dahlgren Virginia) BF Goodrich Tire Group (Akron Ohio) the Bendix Advanced Technology Center (Columbia Maryland) and the Johns Hopkins University Applied Physics Laboratory (Laurel Maryland). He is currently an associate director of the Virginia Institute for Material Systems. He is a registered professional engineer in Virginia and is a member of the American Society of Mechanical Engineers and the American Society for Composites. Zafer Gürdal:received his M.S. in mechanical and aerospace engineering from Illinois Institute of Technology in 1981 and his Ph.D. in aerospace engineering from Virginia Polytechnic Institute and State University in 1985. He worked as a research associate in the Aerospace and Ocean Engineering Department at Virginia Tech before joining the Engineering Science and Mechanics Department as an assistant professor in September 1985. Professor Gürdal's research interests include: composite structures failure mechanics of composites structural optimization and damage tolerant design. He is a member of the American Institute

Characteristics of both thermoplastic and thermoset composite materials as they pertain to marine vehicle applications are discussed. Comparison of various material selection factors such as strength, damage and moisture resistance, and flammability and toxicity as well as cost and availability of thermoset and thermoplastic composite materials are presented. Methods for testing and reducing the flammability and toxicity are discussed. Many commercially available composite systems are reported to provide favorable characteristics for marine applications. Although there seems to be a need for improved production technology for thermoplastics, they present potential advantages in physical properties over thermoset composites.

关键词： Composite Materials

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：