106 research outputs found

    Electromagnetic Analysis of Plane Wave Illumination Effects Onto Passive and Active Circuit Topologies

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    Abstract-In this letter, the finite element-boundary integral method, incorporating the multilevel fast multipole method to reduce the storage cost of the boundary integral matrix, is applied to the analysis of two microstrip filter circuits illuminated via a plane wave. Simulated results indicate that significant voltages are induced across the output ports close to filters' resonances. This study is further extended to a microstrip low-noise amplifier circuit. It will be shown that at certain field strengths, the plane wave illuminating the microstrip amplifier circuit can introduce considerable gain deviation and nonlinearity to its operation. Index Terms-Boundary integral, electromagnetic compatibility/interference (EMC/EMI), finite element, harmonic balance method, method of moments (MoM)

    Crack determination from boundary measurements—Reconstruction using experimental data

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    In this work we assess the effectiveness of Electrical Impedance Tomography for determining the presence and the location of an interior crack from boundary measurements. Electrical Impedance Tomography uses boundary voltages and currents to image the interior of a region. We collect the data needed for this nondestructive evaluation technique by laboratory experiments and apply two numerical inversion algorithms to the data. Our experiments show that the data collected are sufficient to give good estimates of crack locations and crack sizes.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/45002/1/10921_2004_Article_BF00567084.pd

    Active Seismic Experiment accuracy of velocity measurement

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    The following is an analysis of the accuracy of redundant (Photographic) means of measuring grenade velocity as planned during ASE grenade firings at WSMR.prepared by L. V. Liepa

    Digital worlds and civic opportunities : connecting online and offline activism in Lithuania

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    Although democratization via new media technologies has received considerable attention in recent years, empirical research is lacking. The opportunities offered by Internet engagement must be studied at the user-level, looking at individuals’ own grassroots participation. Lithuania serves as an interesting case study, as civic culture is developing simultaneously with the spread of new technologies. The purpose of this study was to examine the types of Internet participation and the civic attitudes that contribute to offline engagement in organizations, local community activities, and political discussions among Lithuanian university students. A 2012 web-based survey of 580 18- to 30-year-olds from five major Lithuanian universities provided evidence that strong associations exist between Internet engagement and structural features of society, civic attitudes, and civic activism offline. Internet activities, centred on social networking, information exchange, and political expression, provide opportunities for creative construction of communities and involvement in civil society. Such online experiences play an important role in shaping young adults’ social environments, where they experiment with interests and identities. By choosing the ways that they engage online, youth are active agents in their civic development

    Surface Field Measurements on Scale Model E-4 Aircraft

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    http://deepblue.lib.umich.edu/bitstream/2027.42/21389/2/rl2265.0001.001.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/21389/1/rl2265.0001.001.tx

    Magentostatic exterior electromagnetic response of EMPTAC aircraft

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    http://deepblue.lib.umich.edu/bitstream/2027.42/6291/5/bac8985.0001.001.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/6291/4/bac8985.0001.001.tx

    Sweep frequency surface field measurements

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    http://deepblue.lib.umich.edu/bitstream/2027.42/6299/5/bac9111.0001.001.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/6299/4/bac9111.0001.001.tx

    EC-135 Surface Field Measurements at Oblique Incidence

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    http://deepblue.lib.umich.edu/bitstream/2027.42/21392/2/rl2268.0001.001.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/21392/1/rl2268.0001.001.tx
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