J. Paul Browning

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The hybrid MIMO phased array radar (HMPAR) is a notional concept for a multisensor radar architecture that combines elements of traditional phased-array radar with the emerging technology of multiple-input multiple output (MIMO) radar. A HMPAR comprises a large number, MP, of T/R elements, organized into M subarrays of P elements each. Within each subarray,(More)
Multiple-input multiple-output (MIMO) radar is a multiple aperture technology characterized by the ability to transmit diverse signals at each aperture. This is in contrast to traditional phased-array radar whereby a single signal is transmitted with a phase shift applied at each element to enable steering of the transmit beam. The hybrid MIMO phased-array(More)
Crack surveys of bridge decks, performed over a 10-year period in northeast Kansas as part of three studies, provide strong guidance in identifying the parameters that control cracking in these structures. The surveys involve steel girder bridges—bridges that are generally agreed to exhibit the greatest amount of cracking in the concrete decks. The surveys(More)
Highway Administration, and industry (9, 10). The study involves a combination of laboratory and field research to develop materials, construction, and structural specifications and to construct lowcracking, high-performance concrete (LC-HPC) bridge decks. To date, 20 bridge decks have been built, 14 in Kansas and six in partner states, using a full(More)
ACI Materials Journal, V. 106, No. 2, March-April 2009. MS No. M-2008-174 received May 30, 2008, and reviewed under Institute publication policies. Copyright © 2009, American Concrete Institute. All rights reserved, including the making of copies unless permission is obtained from the copyright proprietors. Pertinent discussion including authors’ closure,(More)
本文旨在介紹堪薩斯大學近期有關混凝土自由收縮行為之相關研究成果, 本研究係以養護時間、礦物摻料取代部分水泥比例與骨材種類等作為探討混凝 土自由收縮(free shrinkage)行為之參數。 研究中所使用的礦物摻料包括矽灰、水 淬高爐石粉與飛灰,分別以兩種重量比例取代部分水泥,並配合高吸水率 (2.5~3.0%)與低吸水率(小於 0.7%)之兩類粗骨材以拌製混凝土。研究結果顯示, 在使用高吸水率粗骨材的情形下,摻用矽灰或高爐石粉以取代部分水泥,會使 混凝土在所有齡期的收縮量均有降低的現象,至於摻用飛灰的情形,則會增加 混凝土早齡期的收縮量,在長齡期時則無明顯效應;在使用低吸水率粗骨材的 情形下,摻用矽灰或高爐石粉以取代部分水泥,會使僅溼養 7 天的混凝土之早 齡期收縮量有增加的趨勢,當溼養時間從 7 天延長至(More)
Recent work has shown that poly(3-hexylthiophene) (P3HT) and the surface-functionalized fullerene 1-(3-methyloxycarbonyl)propyl(1-phenyl[6,6])C(61) (PCBM) are much more miscible than originally thought, and the evidence of this miscibility requires a return to understanding the optimal morphology and structure of organic photovoltaic active layers. This(More)
Schoenoplectus rhodesicus (Podlech) Lye is re-described with attention drawn to its variable morphology as both semi-terrestrial and submerged aquatic. Two 'forms' are recognised, these reflecting habitat conditions; the semi-terrestrial 'form' developed on lake margins in soft wet mud, later likely to be inundated and submerged as water levels increase(More)
ACI Materials Journal, V. 108, No. 6, November-December 2011. MS No. M-2010-359 received November 12, 2010, and reviewed under Institute publication policies. Copyright © 2011, American Concrete Institute. All rights reserved, including the making of copies unless permission is obtained from the copyright proprietors. Pertinent discussion including author’s(More)