UScholar Works
 
Filters: Date: "1996" Department: "Electrical & Computer Engineering" Collection: "ir_uspace"
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CreatorTitleDescriptionSubjectDate
1 Mathews, V. JohnAdaptive realization of a maximum likelihood time delay estimatorABSTRACT This paper presents an adaptive maximum likelihood method for estimating the time difference of arrival of a source signal at two spatially separate sensors. It is well-known that the maximum likelihood technique achieves the Cramer-Rao lower bound for time delay estimation error for ce...1996
2 Mathews, V. JohnAdaptive volterra filters using orthogonal structuresAbstract-This paper presents an adaptive Volterra filter that empolys a recently developed orthogonalization procedure of Gaussian signals for Volterra system identification. The algorithm is capable of handling arbitrary orders of nonlinearity P as well as arbitrary lengths of memory N for the syst...1996
3 Furse, Cynthia M.; Gandhi, Om P.Calculation of electric fields and currents induced in a millimeter-resolution human model at 60 Hz using the FDTD method with a novel time-to-frequency-domain conversionThe finite-difference time-domain (FDTD) method has previously been used to calculate induced currents in anatomically based models of the human body at frequencies ranging from 20 to 915 MHz and resolutions down to 1.31 cm . Calculations at lower frequencies and higher resolutions have been preclu...Finite-difference time-domain method; FDTD; Induced currents; Human body model1996
4 Stringfellow, Gerald B.Correlation between surface structure and ordering in GaInPGa and In atoms in Ga0.52In0.48P layers spontaneously segregate to form alternating In- and Ga-rich {111} monolayers during organometallic vapor phase epitaxial (OMVPE) growth on (001) oriented GaAs substrates, thus forming the CuPt ordered structure. This ordering phenomenon is believed to be drive...Transformations; Absorbtion spectra; Surface Properties1996
5 Furse, Cynthia M.; Lazzi, Gianluca; Gandhi, Om P.Electrical energy absorption in the human head from a cellular telephoneThe antenna of a cellular telephone in close proximity to the human head for a variety of time periods raises questions. This research uses finite-difference time-domain (FDTD) method to calculate the power deposition from a cellular telephone on a high-resolution model of a human head as measured b...Finite-difference time-domain method; FDTD; Power deposition; Human head model; Electrical energy absorption; Specific absorption rate1996
6 Furse, Cynthia M.; Gandhi, Om P.; Lazzi, GianlucaFDTD computation of power deposition in the head for cellular telephonesThe finite-difference time-domain method is used to calculate radiation pattern and specific absorption rate (SAR) in the human head due to cellular telephones. For realistic simulation of the ordinary positions of holding the phone, the ear of the model is pressed against the head, the head is tilt...Finite-difference time-domain method; FDTD; Specific absorption rate; Radiation patterns; Human head model; Power deposition1996
7 Mathews, V. JohnParallel-cascade realizations and approximations of truncated volterra systemsAbstract This paper introduces parallel-cascade realizations of truncated Volterra systems with arbitrary, but finite order of nonlinearity. Parallel-cascade realizations implement higher-order Volterra systems using parallel and multiplicative combinations of lower-order Volterra systems. Such rea...1996
8 Stringfellow, Gerald B.Solid phase immiscibility in GaInNThe large difference in interatomic spacing between GaN and InN is found to give rise to a solid phase miscibility gap. The temperature dependence of the binodal and spinodal lines in the Ga1xInxN system was calculated using a modified valence-force-field model where the lattice is allowed to relax ...Interatomic spacing; Valence-force field; epitaxial growth1996
9 Furse, Cynthia M.; Gandhi, Om P.State of the science regarding RF dosimetry, measurement and certificationCellular telephones and wireless personal communication systems (PCS) are being introduced into society at a very rapid rate. Whereas the present-day cellular telephones in the United States operate at midband transmission frequencies of about 835 MHz (about 900 MHz in Europe), higher frequencies o...RF dosimetry; Cell phone safety1996
10 Stringfellow, Gerald B.Surface photoabsorption study of the effect of V/III ratio on ordering in GaInPCu-Pt ordering is widely observed in Ga0.5In0.5P layers grown by organometallic vapor phase epitaxy. The degree of order is a strong function of the input partial pressure of the phosphorus precursor, i.e., the V/III ratio, during growth. By observing the surface structure using in situ surface p...Degree of order; Photoluminescence; Transmission electron microscopy1996
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