111,135 research outputs found

    Characteristics of ocean-reflected short radar pulses with application to altimetry and surface roughness determination

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    Current work related to geodetic altimetry is summarized. Special emphasis is placed on the effects of pulse length on both altimetry and sea-state estimation. Some discussion is also given of system tradeoff parameters and sea truth requirements to support scattering studies. The problem of analyzing signal characteristics and altimeter waveforms arising from rough surface backscattering is also considered

    Single-Stage Experimental Evaluation of Boundary Layer Blowing Techniques for High Lift Stator Blades. III - Data and Performance of Single-Slotted 0.65 Hub Diffusion Factor Stator

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    Test on overall and blade element performance of single slotted 0.65 hub diffusion factor stator with self energized blowing boundary layer contro

    Fourlined Plant Bug (Hemiptera: Miridae), a Reappraisal: Life History, Host Plants, and Plant Response to Feeding

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    Phenology of the fourlined plant bug, Poecilocapsus lineatus, is presented for southcen- tral Pennsylvania; life history and habits are re-examined. Although breeding was previously thought to occur only on woody plants, we found that nymphs develop on numerous herbs. An extensive list of hosts, more than 250 species in 57 families, is compiled from the literature and the authors\u27 observations; preferences are noted for plants in the Labiatae, Solanaceae, and Compositae. Damage consists of lesions on foliage, the size and shape of the spots varying with leaf texture, pubescence, and venation. Plant response to feeding is immediately visible, the lesions seeming to appear simultaneously with insertion of the bug\u27s stylets. Histolysis of plant tissues, the most rapid response to mind feeding yet reported, is attributed to a potent lipid enzyme whose active constituents are under investigation

    Pionic Color Transparency

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    We use a semi-classical approximation to investigate the effects of color transparency on pion electroproduction reactions. The resulting reduced nuclear interactions produce significant, but not dominating, differences with the results of conventional distorted-wave, Glauber-type treatments at kinematics accessible to Jefferson Laboratory. Nuclear effects that could mimic the influence of color transparency are also discussed.Comment: 10 pages, 6 figure

    Microwave backscattering theory and active remote sensing of the ocean surface

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    The status is reviewed of electromagnetic scattering theory relative to the interpretation of microwave remote sensing data acquired from spaceborne platforms over the ocean surface. Particular emphasis is given to the assumptions which are either implicit or explicit in the theory. The multiple scale scattering theory developed during this investigation is extended to non-Gaussian surface statistics. It is shown that the important statistic for the case is the probability density function of the small scale heights conditioned on the large scale slopes; this dependence may explain the anisotropic scattering measurements recently obtained with the AAFE Radscat. It is noted that present surface measurements are inadequate to verify or reject the existing scattering theories. Surface measurements are recommended for qualifying sensor data from radar altimeters and scatterometers. Additional scattering investigations are suggested for imaging type radars employing synthetically generated apertures

    Development of mathematical models for processing S-193 radar altimeter data

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    There are no author-identified significant results in this report

    Development of mathematical models for processing altimeter data

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    There are no author-identified significant results in this report

    The location of innovative activity in Europe

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    In this paper we use new data to describe how firms from 15 European countries organise their innovative activities. The data matches firm level accounting data with information on the patents that those firms and their subsidiaries have applied for at the European Patents Office. We describe the data in detail

    Acquisition of quick-look data from SL-2

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    There are no author-identified significant results in this report
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