1996 IEEE Aerospace Applications Conference. Proceedings最新文献_第5页

Fabrication of magnetic thin film structures for control of electromagnetic interference 控制电磁干扰的磁性薄膜结构的制备

1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.499678

C. Grimes

{"title":"Fabrication of magnetic thin film structures for control of electromagnetic interference","authors":"C. Grimes","doi":"10.1109/AERO.1996.499678","DOIUrl":"https://doi.org/10.1109/AERO.1996.499678","url":null,"abstract":"We are concerned with methods for the absorption of unwanted electromagnetic energy, which is commonly referred to as electromagnetic interference or EMI. High permeability magnetic metals used for the control of EMI have high conductivities and hence support eddy currents, which act to reflect the incident wave before it can be absorbed. Eddy currents can be reduced by fabricating the film in a multilayer design, with the magnetic layers separated by electrically insulating dielectric layers, and also by sectioning the film into electrically isolated regions. However magnetic properties are significantly affected by sample shape. In order to find high performance EMI absorbers, we examine the low frequency BH loop, magnetic flux density B versus applied magnetic field H, and complex permeability spectra of multilayer permalloy films laser processed to define stripes geometries upon the samples. The stripes are defined parallel to the as-deposited magnetic hard axis (perpendicular to the direction of magnetization). We begin by examining different laser energy densities for groove definition in films of different thicknesses. We find the sample geometry can compensate for the inherent anisotropy field of the as-deposited film, resulting in fabrication of films with precisely controlled permeabilities. We find that for multilayer thin films the demagnetizing field, which is a function of groove depth, is able to reorient the easy and hard axes from the initial orientation. At the point of re-orientation, the samples become isotropic with large permeabilities. As the groove becomes more clearly defined the hard axis permeability increases, while the easy axis permeability decreases. The role of stripe width and ambient processing atmosphere have been investigated and are reported.","PeriodicalId":262646,"journal":{"name":"1996 IEEE Aerospace Applications Conference. Proceedings","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122292165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Reverse engineering data requirements 逆向工程数据需求

1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.495931

Markus Hoffman, Carver

引用次数: 5

3D packaging technology overview and mass memory applications 3D封装技术概述及大容量存储器应用

1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.495988

R. Terrill, G.L. Beene

引用次数: 9

A multi-mission space avionics architecture 一种多任务空间航空电子系统架构

1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.495882

S. Chau, K. Reh, B. Cox, J. Barfield, W. Lockhart, M.L. McLelland

引用次数: 4

A reverse engineering toolkit for design recovery 用于设计恢复的逆向工程工具包

1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.495980

R. Erraguntla, D. Carver

引用次数: 2

PetaFLOPS scale computing systems, opportunities, and challenges 千万亿次浮点运算规模的计算系统，机遇和挑战

1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.496052

T. Sterling

{"title":"PetaFLOPS scale computing systems, opportunities, and challenges","authors":"T. Sterling","doi":"10.1109/AERO.1996.496052","DOIUrl":"https://doi.org/10.1109/AERO.1996.496052","url":null,"abstract":"Petaflops is a scale of computer performance equal to a million billion operations per second and is thousands of times more powerful than today's most powerful massively parallel processors. Although representative of a class of system far beyond feasibility with contemporary technology, petaflops computer architecture is the target of active investigation and the topic of government sponsored workshops. Realizing petaflops capability will depend on advances in device technology, architectural structures, and parallel algorithms for scientific and engineering applications. This paper describes the field of petaflops computing in terms of the evolution of enabling technologies, new architectures likely to deliver effective performance at the petaflops level, and examples of important applications that will be significantly advanced through the availability of future petaflops computers. A summary of the seminal findings of several recent workshops exploring this regime of computing systems will be presented in detail. Analysis of the critical technologies and their evolution will be used to support estimates of the likely timeframe in which such capability will become practical.","PeriodicalId":262646,"journal":{"name":"1996 IEEE Aerospace Applications Conference. Proceedings","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125720875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Database replication in a high up-time environment 高正常运行时间环境中的数据库复制

1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.496073

D. Williamson

{"title":"Database replication in a high up-time environment","authors":"D. Williamson","doi":"10.1109/AERO.1996.496073","DOIUrl":"https://doi.org/10.1109/AERO.1996.496073","url":null,"abstract":"Database and transaction processing (TP) systems are two components of a high up-time environment that are critical to the continued commercial success of many large organizations. This paper addresses the technology and issues of database availability and replication in the context of a, high up-time environment. The high up-time environment may be labeled \"7/24 availability\" to indicate a need for systems that are available twenty four hours a day, seven days a week, and all year round. This paper discusses the demand for 7/24 systems that can survive earthquakes and other natural and/or man made disasters, through the use of hardware and software replication of databases in locations that are geographically distant from each other. The paper focuses in detail on the hardware, database and network software technology that is required to keep remote replication systems in a state of constant readiness. The paper then discusses the management issues of hardware system redundancy and the seven scenarios that must be played out when managing disaster situations. This paper draws from Bull's customer experience and requirements in the use of Remote Duplicate Database Facility 8 (RDDF 8) to maintain TP systems in a state of constant readiness. This technology is particularly appropriate for Aerospace logistics applications that have to maintain a global awareness of parts availability and readiness. This paper will help management evaluation of current situations and future directions in developing high availability systems.","PeriodicalId":262646,"journal":{"name":"1996 IEEE Aerospace Applications Conference. Proceedings","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116717505","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Measurements of upper tropospheric and lower stratospheric water substance content using ARES instrumentation 使用ARES仪器测量对流层上层和平流层下层水物质含量

1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.496059

A. T. Stair, C. Beeler, M. Gardner, C. H. Humphrey, S. Rappaport, R. Rieder, O. Shepherd, M. McElroy, K. D. Bishop, K. Emanuel, P. Joss, G. Macdonald

{"title":"Measurements of upper tropospheric and lower stratospheric water substance content using ARES instrumentation","authors":"A. T. Stair, C. Beeler, M. Gardner, C. H. Humphrey, S. Rappaport, R. Rieder, O. Shepherd, M. McElroy, K. D. Bishop, K. Emanuel, P. Joss, G. Macdonald","doi":"10.1109/AERO.1996.496059","DOIUrl":"https://doi.org/10.1109/AERO.1996.496059","url":null,"abstract":"Water plays a central role in the greenhouse effect in the Earth's atmosphere. The quantity of water substance (water vapor plus condensed water) in the upper troposphere and lower stratosphere (altitudes of approximately 6-18 km), is especially important to the modeling of the global climate. Of particular interest is the water substance in the vicinity of the tropopause. Empirical data concerning the mean water substance content and its spatial and temporal variability through this range of altitudes are extremely sparse; in fact, the available data are inadequate for meaningful comparison with the predictions of global climate models. The ARES program, which employs a WB-57F aircraft that can fly at a wide range of altitudes as high as 19 km, provides a powerful new resource for measuring the atmospheric water substance content through the critical range of interest. The primary instrument on board the ARES aircraft is the imaging spectrometer, which collects data in the 2-6.3 /spl mu/m wavelength region. The volume density of the atmospheric water substance is determined as a function of altitude by measuring the absorption of solar or lunar irradiance at several altitude increments from 6 km to 18 km. The use of the WB-57F aircraft for these data collections allows for the measurement of geographic and seasonal variations in the atmospheric water content. Upcoming flights will examine these variations and will include an instrument upgrade package that includes an ozone meter to determine the altitude of the tropopause, as well as Lyman-/spl alpha/ and chilled mirror hygrometers for independent verification of the water vapor densities measured by the ARES spectrophotometric data. This paper presents the results of a preliminary set of measurements obtained in May and December 1994, and describes plans for upcoming flights.","PeriodicalId":262646,"journal":{"name":"1996 IEEE Aerospace Applications Conference. Proceedings","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114180307","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Triple-triple redundant 777 primary flight computer 3 - 3冗余777主飞行计算机

1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.495891

Y. C. Yeh

引用次数: 301

Communication technology developments in Scotland: AbMAN

1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.496075

B. Murton

引用次数: 0