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Creator | Title | Description | Subject | Date |
476 |
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Khan, Faisal Habib | Start-up and dynamic modeling of the multilevel modular capacitor-clamped converter | This paper will present the analytical proof of concept of the multilevelmodular capacitor-clamped converter (MMCCC). The quantitative analysis of the charge transfer mechanism among the capacitors of the MMCCC explains the start-up and steadystate voltage balancing. Once these capacitor voltages a... | | 2010-02 |
477 |
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Furse, Cynthia M.; Gandhi, Om P. | State of the science regarding RF dosimetry, measurement and certification | Cellular 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 safety | 1996 |
478 |
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Furse, Cynthia M. | Statistical comparison of capacity predictions for realistic MIMO channels | The impact of antenna polarization on channel capacity is explored in multiple-input, multiple-output (MIMO) systems. An idealized polarization model involving branch power rations (BPR's) and channel cross-coupling is incorporated into channel-specific capacity calculations. Results are compared f... | | 2007-01-01 |
479 |
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Tasdizen, Tolga; Hansen, Charles D. | Statistically quantitative volume visualization | Visualization users are increasingly in need of techniques for assessing quantitative uncertainty and error in the images produced. Statistical segmentation algorithms compute these quantitative results, yet volume rendering tools typically produce only qualitative imagery via transfer functionbase... | | 2005 |
480 |
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Stringfellow, Gerald B. | Step structure and ordering in GaInP | Presents information from an experiment on the step structure and ordering in GalnP. Information on the step spacing and degree of order in the epitaxial layers; Details on the experiment; Results from the experiment. | Physics; Ordering; Steps | 1998 |
481 |
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Stringfellow, Gerald B. | Step structure and ordering in Te-doped GaInP | The step structure and CuPt ordering in GaInP layers grown by organometallic vapor phase epitaxy on singular GaAs substrates have been investigated as a function of Te (DETe) doping using atomic force microscopy, and electrical and optical properties measurements. The degree of order decreases for T... | Surfaces; Te doping; Bandgap energy | 1998 |
482 |
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Stringfellow, Gerald B. | Step structure and ordering in Zn-doped GaInP | Presents the results of a study of Zinc dopant effects on both step structure and ordering in GaInP in an effort to further clarify the disordering mechanism. Comparison of the results obtained for Zinc with those reported for tellurium; Experiment; Results; Discussion; Conclusion. | Gallium Compounds; Zinc; Ordering | 1999 |
483 |
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Myers, Chris J. | Stochastic cycle period analysis in timed circuits | This paper presents the stochastic cycle period as a performance metric for timed asynchronous circuits. The stochastic cycle period is a sum of weighted delays whose value represents the expected delay of a single cycle in the specification. Each weight denotes the amount of time a delay contribute... | | 1999 |
484 |
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Myers, Chris J. | Stochastic cycle period analysis in timed circuits | This paper presents a technique to estimate the stochastic cycle period (SCP), a performance metric for timed asynchronous circuits. This technique uses timed stochastic Petri nets (TSPN) which support choice and arbitrary delay distributions. The SCP is the delay of the average path in a TSPN when ... | | 1999 |
485 |
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Furse, Cynthia M. | Stochastic FDTD for analysis of statistical variation in electromagnetic fields | This paper describes a new stochastic finite difference time domain (S-FDTD) method for calculating the variance in the electromagnetic fields caused by variability or uncertainty in the electrical properties of the materials in the model. Details of the 1D derivation using truncated Taylor series a... | | 2012-01-01 |
486 |
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Mathews, V. John | Stochastic gradient adaptive filters with gradient adaptive step sizes | This paper presents two adaptive step-size gradient adaptive filters. The step sizes are changed using a gradient descent algorithm designed to minimize the squared estimation error. The first algorithm uses the same step-size sequence for all the filter coefficients whereas the second algorithm use... | | 1990 |
487 |
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Mathews, V. John | Stochastic mean-square performance analysis of an adaptive Hammerstein filter | ABSTRACT This paper presents an almost sure (a.s.) mean-square performance analysis of an adaptive Hammerstein filter for the case when the measurement noise in the desired response signal is a martingale difference sequence. The system model consists of a series connection of a memoryless nonlinea... | | 2004 |
488 |
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Mathews, V. John | Stochastic mean-square performance analysis of an adaptive Hammerstein filter | Abstract-This paper presents an almost sure mean-square performance analysis of an adaptive Hammerstein filter for the case when the measurement noise in the desired response signal is a martingale difference sequence. The system model consists of a series connection of a memoryless nonlinearity fol... | | 2006 |
489 |
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Stringfellow, Gerald B. | Strain-enhanced doping in semiconductors: effects of dopant size and charge state | When a semiconductor host is doped by a foreign element, it is inevitable that a volume change will occur in the doped system. This volume change depends on both the size and charge state difference between the dopant and the host element. Unlike the ‘‘common expectation'' that if the host is de... | | 2010-11 |
490 |
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Mathews, V. John | Subband particle filtering for speech enhancement | ABSTRACT Particle filters have recently been applied to speech enhancement when the input speech signal is modeled as a time-varying autoregressive process with stochastically evolving parameters. This type of modeling results in a nonlinear and conditionally Gaussian statespace system that is not ... | | 2006 |
491 |
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Mathews, V. John | Subband vector quantization of images using hexagonal filter banks | Abstract Results of psychophysical experiments on human vision conducted in the last three decades indicate that the eye performs a multichannel decomposition of the incident images. This paper presents a subband vector quantization algorithm that employs hexagonal filter banks. The hexagonal filte... | | 1992 |
492 |
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Simpson, Jamesina J. | Subdiffraction optical resolution of a gold nanosphere located within the nanojet of a Mie-resonant dielectric microsphere | We theoretically investigate light scattering from a bi-sphere system consisting of a gold nanosphere and a lossless dielectric microsphere illuminated at a resonant optical wavelength of the microsphere. Using generalized multisphere Mie theory, we find that a gold nanosphere 100 times smaller than... | | 2007-01-01 |
493 |
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Simpson, Jamesina J. | Substrate integrated waveguides optimized for ultrahigh-speed digital interconnects | This paper reports an experimental and computational study of substrate integrated waveguides (SIWs) optimized for use as ultrahigh-speed bandpass waveguiding digital interconnects. The novelty of this study resides in our successful design, fabrication, and testing of low-loss SIWs that achieve 100... | | 2006-01-01 |
494 |
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Mathews, V. John | Sufficient stability bounds for slowly varying direct-form recursive linear filters and their applications in adaptive IIR filters | Abstract-This correspondence derives a sufficient time-varying bound on the maximum variation of the coefficients of an exponentially stable time-varying direct-form homogeneous linear recursive filter. The stability bound is less conservative than all previously derived bounds for time-varying IIR ... | | 1999 |
495 |
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Simpson, Jamesina J. | Super-enhanced optical energy concentration through a subwavelength aperture using a photonic nanojet | Optical transmission through resonant subwavelength apertures in optically thick metal films have received an explosion of interest for their ability to overcome the diffraction limit of light and concentrate light efficiently into a subwavelength volume. This achievement has attracted the use of su... | | 2014-01-01 |
496 |
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Stringfellow, Gerald B. | Surface photo-absorption studies of the chemical structure of GaInP grown by organometallic vapor phase epitaxy | The surface structure of Ga0.52In0.48P was studied by surface photoabsorption. An absorption peak due to P dimers on Ga0.52In0.48P was observed at 400 nm, shorter than for InP (430 nm). From comparison with results for GaAs and InP, the data are interpreted to indicate that at a tertiarybutylphos... | Absorption peak; Ordering; Substrate orientation | 1995 |
497 |
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Stringfellow, Gerald B. | Surface photoabsorption study of the effect of substrate misorientation on ordering in GaInP | Substrate orientation strongly affects Cu-Pt ordering in Ga0.5In0.5P layers grown by organometallic vapor phase epitaxy. In situ surface photoabsorption SPA measurements were used to measure the concentration of 1 10-oriented P dimers, characteristic of the 2 4 reconstructed surface, as a functio... | P-dimer concentration; Photoluminescence measurements; Surface reconstruction | 1996-04-15 |
498 |
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Stringfellow, Gerald B. | Surface photoabsorption study of the effect of V/III ratio on ordering in GaInP | Cu-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 microscopy | 1996 |
499 |
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Stringfellow, Gerald B. | Surface photoabsorption study of the effects of growth temperature and V/III ratio on ordering in GaInP | Surface photoabsorption (SPA) measurements were used to clarify the Cu-Pt ordering mechanism in Ga0.5In0.5P layers grown by organometallic vapor phase epitaxy. The Cu-Pt ordering is strongly affected by the growth temperature and the input partial pressure of the phosphorus precursor, i.e., the V/II... | P-dimer concentration; Oriented phosphorus dimers; Surface reconstruction | 1996-05-01 |
500 |
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Stringfellow, Gerald B. | Surface photoabsorption transients and ordering in GaInP | Heterostructures and quantum wells can be produced in GaInP without changing the solid composition by simply varying the order parameter. Since CuPt ordering reduces the band-gap energy, changes in the order parameter induced by changes in growth conditions result in heterostructures with band-ga... | Order parameters; Quantum wells; P-dimers | 1998-03-15 |