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Your search keyword '"Parent, Mark G."' showing total 13 results
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13 results on '"Parent, Mark G."'

1. RADAR DETECTION OF INDIVIDUAL RAINDROPS

Author

Schmidt, Jerome M., Flatau, Piotr J., Harasti, Paul R., Yates, Robert. D., Delene, David J., Gapp, Nicholas J., Kohri, William J., Vetter, Jerome R., Nachamkin, Jason E., Parent, Mark G., Hoover, Joshua D., Anderson, Mark J., Green, Seth, and Bennett, James E.

Published
2019

2. Terrestrial Microwave Power Beaming

Author

Rodenbeck, Christopher T., primary, Tierney, Brian B., additional, Park, James, additional, Parent, Mark G., additional, DePuma, Christopher B., additional, Bauder, Chandler J., additional, Pizzillo, Thomas J., additional, Jaffe, Paul I., additional, Simakauskas, Brian H., additional, and Mayhan, Trevor, additional

Published
2022
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10. Preliminary Investigations of a Low-Cost Ultrawideband Array Concept.

Author

Kindt, Rick W., Kragalott, Mark, Parent, Mark G., and Tavik, Gregory C.

Subjects
ULTRA-wideband antennas, COST effectiveness, BANDWIDTHS, APERTURE antennas, NUMERICAL analysis, NOTCHED bar testing, POLARIZATION (Electricity)
Abstract

A design concept is presented that achieves ultrawideband (UWB) array performance with significantly fewer elements than the traditional approach of using a single wideband antenna element type to fully populate the array. Starting from a conventional 8:1 bandwidth array design of a given aperture size, an array of equivalent aperture and bandwidth is created using scaled elements of three different sizes. This wavelength-scaled equivalent array has fewer than 18% of the original element count, i.e., roughly 6-times fewer elements, a similar reduction in weight, and most importantly, a significant reduction in electronics required to feed the array. If proven viable, array architectures of this type could make UWB arrays significantly more cost effective. In this preliminary numerical study, rigorous full-wave simulation tools are used to test the performance of small but informative wavelength-scaled array configurations of flared-notch radiators for the single-polarization case. [ABSTRACT FROM AUTHOR]

Published
2009
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12. Response to Exercise after Withdrawal from Chronic Alcoholism

Author

Moskowitz, Ralph M., Parent, Mark G., Marshall, Robert C., Barnett, Charles A., and Errichetti, Anthony J.

Abstract

To test for early evidence of alcoholic cardiomyopathy and to assess changes in exercise response after abstinence, 12 asymptomatic alcoholic men (group 1) underwent maximal upright bicycle exercise radionuclide ventriculography two to six days after alcohol withdrawal. Six of these patients (group 1A) had similar testing two to four weeks later. Six control subjects (group 2) had repeated exercise tests without isotope study. Croup 1 left ventricular ejection fraction response (LVEF) was normal. LVEF at similar workloads did not differ in group 1A (p = NS). However, unlike group 2 results, the linear regression line relating double product to exercise stage in group 1A was higher at first exercise (p<0.05), probably due to the effects of alcohol withdrawal. We conclude that radionuclide left ventriculographic findings in these patients do not support the concept of a preclinical alcoholic cardiomyopathy made apparent by exercise, and exercise very early after alcohol withdrawal is associated with an increased myocardial oxygen demand at any given workload.

Published
1988
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13. Perturbed square ring slot antenna with reconfigurable polarization

Author

The United States of America as represented by the Secretary of Agriculture, Virginia Tech Intellectual Properties, Inc., Zaghloul, Amir I., Parent, Mark G., and Dorsey, W. Mark

Subjects
H01Q21/245, 343/769, H01Q19/005
Abstract

A reconfigurable polarization antenna includes a microwave dielectric substrate having a ground plane that has a centrally located slot with five conducting patches, four of which form an evenly spaced apart perimeter group with a gap between each and the fifth, centrally positioned conducting patch. A conducting pad is positioned in each gap and is connected via a switch to the ground plane. A microstrip feed line including a short stub is positioned on the opposite side of the substrate and electromagnetically coupled to the slot. The polarization of the antenna is reconfigured by a selection of an on or off state of each of said switches.

Published
2009

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