Ray Garcia

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We explore high-impedance surfaces for use in low-profile, switched-beam diversity antennas for mobile communications. High-impedance surfaces provide two important advantages for low-profile antennas: (1) They suppress the propagation of surface currents. (2) Image currents appear inphase, rather than our-of-phase as on an ordinary metal ground plane. This(More)
The Geosynchronous Imaging Fourier Transform Spectrometer (GIFTS) instrument, under development for the NASA New Millennium Program, will serve as a valuable test bed for the evaluation of approaches to flight hardware and ground data processing in the years leading up to NOAA's operational Hyperspectral Environmental Suite (HES). The GIFTS sensor makes use(More)
For regulatory oversight and quality control of Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) actions, fish, mussels, and sediments were analyzed from the Peconic River system on Long Island, NY, downstream of the Brookhaven National Laboratory, as well as from control locations. The analyses were for photon-emitting(More)
In recent times, a rapid development in the production of less energy intensive cements and concretes with high performance (resistance and durability) has occurred. This has been accomplished by the use of industrial wastes or by-products (fly ash, slag, silica fume, rice husk) with considerable pozzolanic activity. The use of those secondary materials(More)
A lower limit of detection of 0.04 Bq L-1 for measuring 131I in milk or water with a gamma-ray spectrometer was achieved with a large 118% intrinsic germanium detector. Three-liter samples with 131I tracer in a reentrant beaker were counted within a lead shield for 12,000 to 55,000 s to demonstrate detection at this concentration. Samples of milk collected(More)
A novel broadside coplanar waveguide using both substrate sides, suitable for wide-band microwave and millimeter-wave integrated circuits, has been studied. The proposed broadside coplanar waveguide combines via-hole and air-bridge effects for ground equalization to suppress slotline mode. The wave concept combined with the Green's functions with boundary(More)
Ground calibration algorithms for a Geosynchronous Imaging FTS (GIFTS) are being developed at the University of Wisconsin-Madison Space Science and Engineering Center. This development is being conducted in support of NOAA's GOES-R Risk Reduction program with a focus on the hyperspectral sounder that is anticipated to be a part of the GOES-R Hyperspectral(More)
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