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Now showing items 2452024579 of 46383

Optical manipulation of helium(2(3)S) atoms with a diode laser
(1995)A commercial Spectra Diode Laboratories, 1.083 $\mu$m diode laser has been used to efficiently spin polarize an atomic beam of He(2$\sp3$S) metastable atoms by optical pumping on the $\rm 2\sp3S\sb1\rightarrow2\sp3P\sb1$ ... 
Optical manipulation of helium(2(3)S) atoms with a diode laser
(1995)A commercial Spectra Diode Laboratories, 1.083 $\mu$m diode laser has been used to efficiently spin polarize an atomic beam of He(2$\sp3$S) metastable atoms by optical pumping on the $\rm 2\sp3S\sb1\rightarrow2\sp3P\sb1$ ... 
Optical Molecular Imaging in the Gastrointestinal Tract
(201305)Recent developments in optical molecular imaging allow for realtime identification of morphological and biochemical changes in tissue associated with gastrointestinal neoplasia. This review summarizes widefield and high ... 
Optical Molecular Imaging of Multiple Biomarkers of Epithelial Neoplasia: Epidermal Growth Factor Receptor Expression and Metabolic Activity in Oral Mucosa
(201206)Biomarkers of cancer can indicate the presence of disease and serve as therapeutic targets. Our goal is to develop an optical imaging approach using molecularly targeted contrast agents to assess several centimeters of ... 
Optical properties of a spherical 2D electron gas in the presence of a uniform magnetic field
(2005)Using the RPA, we calculate the plasmon frequencies of an electron gas on a twodimensional spherical surface in the presence of a weak magnetic field. We show that the magnetic field results in a coupling between electronic ... 
Optical properties of novel structures of colloidal crystals
(2004)Photonic crystals are materials having a periodicity in their refractive index. This results in the inhibition of select frequencies of light from propagating within the crystal causing the formation of a gap in the photonic ... 
Optical Properties of StarShaped Gold Nanoparticles
(20060328) 
Optical Properties of Strongly Coupled PlasmonExciton Hybrid Nanostructures
(2012)Strongly coupled plasmonexciton hybrid nanostructures are fabricated and their optical properties are studied. The plasmonic and excitonic systems are gold nanoshells and Jaggregates, respectively. Gold nanoshells are ... 
Optical spectroscopy and imaging systems for gynecological cancers: from UltravioletC (UVC) to the Midinfrared
(2011)Optical spectroscopy and imaging has proving to be of diagnostic relevance in many organ sites. We use fluorescence and FTIR spectroscopy to study gynecological organ sites and develop classification algorithms for cancer ... 
Optical spectroscopy and numerical modeling of nonradiative shocks in supernova remnants
(2000)This thesis is an observational and theoretical study of the optical emission from nonradiative shocks in three supernova remnants: the Cygnus Loop, RCW 86 and Tycho, which together span a wide range of shock velocities ... 
Optical spectroscopy of singlewalled carbon nanotubes in high magnetic fields
(2007)Magnetic flux threading a singlewalled carbon nanotube (SWNT) is predicted to influence its electronic structure through the AharonovBohm (AB) effect, causing bandgap oscillations and absorption peaks splitting. In order ... 
Optical Spectroscopy of SingleWalled Carbon Nanotubes Under Extreme Conditions
(2012)Singlewalled carbon nanotubes (SWNTs) are one of the leading candidate materials to realize novel nanoscale photonic devices. In order to assess their performance characteristics as optoelectronic materials, it is crucial ... 
Optical Studies on Functionalized Graphene Systems
(20140505)Graphene, the ‘wonder material’, has received a lot of attention for its excellent electronic properties. However, the lack of a band gap severely limits its use, especially in optoelectronic applications. Therefore, opening ... 
Optical systems for pointofcare diagnostic instrumentation: analysis of imaging performance and cost
(2014)One of the key elements in pointofcare (POC) diagnostic test instrumentation is the optical system required for signal detection and / or imaging. Many tests which use fluorescence, absorbance, or colorimetric optical ... 
Optically detected terahertz resonance spectroscopy of semiconductor nanostructures
(2005)In this dissertation work we have developed an ultracompact opticallydetected terahertz resonance (ODTR) spectroscopy system, using quantum cascade lasers (QCLs). This system can be used for investigating various terahertz ... 
Opticallyabsorbing nanoparticles for enhanced tissue repair
(20040203)This invention is generally in the field of improved methods for the localized delivery of heat and the use thereof for the repair of tissue. The method involves localized induction of hyperthermia in tissue or materials ... 
Opticallyactive nanoparticles for use in therapeutic and diagnostic methods
(20030311)This invention is generally in the field of improved methods for the localized delivery of heat and the localized imaging of biological materials. The delivery may be in vitro or in vivo and is useful for the localized ... 
Optics and virtualization as data center network infrastructure
(2012)The emerging cloud services have motivated a fresh look at the design of data center network infrastructure in multiple layers. To transfer the huge amount of data generated by many data intensive applications, data center ... 
OPTIMAL APPROXIMATION ALGORITHMS FOR DIGITAL FILTER DESIGN
(1983)Several new algorithms are presented for the optimal approximation and design of various classes of digital filters. An iterative algorithm is developed for the efficient design of unconstrained and constrained infinite ... 
OPTIMAL ARRAYS FOR NARROWBAND BEAMFORMING
(1984)We develop equations describing the capability of arbitrary threedimensional arrays to resolve and detect two narrowband sources using conventional (CONV) beamforming, minimum energy (ME) adaptive beamforming, and linear ... 
Optimal binaural processing based on point process models of preprocessed cues
(1995)In localizing highfrequency tonal signals in the horizontal plane, the lateral superior olive (LSO) encodes the interaural level differences (ILD), the crucial cue for azimuthal angle extraction at some nuclei more central ... 
Optimal borehole communication using multicarrier modulation
(2007)Transmission of downhole measurements to the surface while the oil well is being drilled (logging while drillingLWDtelemetry) is the key to the efficient and successful recovery of hydrocarbon resources. The most promising ... 
Optimal Choice of the Kernel Function for the Parzen Kerneltype Density Estimators
(19750420)Let W<sub>p</sub><sup>(2)</sup> be the Sobolev space of probability density functions f(X) whose first derivative is absolutely continuous and whose second derivative is in L<sub>p</sub>( ∞ ,+ ∞), for p ∈ ... 
Optimal combat maneuvers of a nextgeneration jet fighter aircraft
(1998)This thesis deals with the optimization of four classes of combat maneuvers for a nextgeneration jet fighter aircraft: climb maneuvers, flytopoint maneuvers, popup attack maneuvers, and dive recovery maneuvers. For the ... 
Optimal contracts for trade restrictions
(1993)This paper addresses the question of how the government should elicit cost information from a high or low domestic industry to determine socially optimal levels of imports. The results are shown to depend on whether firms ... 
Optimal control of a class of realtime computational systems
(1991)In many computational systems, tasks comprising numerical or symbolic data arrive at a processor periodically. Processing of the $i\sp{th}$ task has to stop before processing of the ($i$ + 1)$\sp{th}$ task begins, causing ... 
Optimal control of ship maneuvers for course change, sidestep, and collision avoidance
(1999)We consider a ship subject to kinematic, dynamic, and moment equations and steered via the rudder under the assumptions that the rudder angle and rudder angle time rate are subject to upper and lower bounds. We formulate ... 
Optimal control of time evolution systems: Controllability investigations and numerical algorithms
(1995)Optimal control problems for partial differential equations of evolution, mostly of parabolic type, are considered. The means of control are a nonhomogeneous boundary condition or forcing term. A hierarchical control problem ... 
Optimal design problems for quasidisks and partially clamped drums: Existence, symmetrization, and numerical methods
(1997)It is shown that the class of quasidisks in the complex plane, with fixed quasicircle constant and area, is compact in both the Hausdorff metric and in the sense of Caratheodory convergence. Compactness for chordarc domains ... 
Optimal Detection Using Bilinear Time Frequency and Time Scale Representations
(19951220)Bilinear timefrequency representations (TFRs) and timescale representations (TSRs) are potentially very useful for detecting a nonstationary signal in the presence of nonstationary noise or interference. As quadratic ... 
Optimal digital communication of analog signals
(20050301)In this paper, the problem of optimally communicating analog sources using a bandwidth and power limited digital system is considered. We propose and analyze optimal combined sourcechannel coding schemes that jointly ... 
OPTIMAL ESTIMATION FOR BANDLIMITED SIGNALS
(1979)The problem of estimation for bandlimited signals is investigated. The desired estimate is based on a finite number of time samples taken from a measurement interval of length T(,M). With no additional information, the ... 
Optimal Kernels for Nonstationary Spectral Estimation
(19950220)Current theories of a timevarying spectrum of a nonstationary process all involve, either by definition or by difficulties in estimation, an assumption that the signal statistics vary slowly over time. This restrictive ... 
Optimal openloop CMG maneuvers
(2002)In this thesis, a general method was developed to solve the momentumoptimal attitude command trajectory for a given reorientation. The solution method relied on converting a standard twopoint boundaryvalue problem to ... 
Optimal parallel 2D FIR digital filter with separable terms
(19970501)This paper completely solves the optimal Weighted Least Mean Square (WLMS) design problem using sums of separable terms. For any fixed number of separable terms (less than or equal to the rank of the unconstrained solution), ... 
Optimal Phase Kernels for TimeFrequency Analysis
(19960501)We consider the design of kernels for timefrequency distributions through the phase, rather than amplitude, response. While phase kernels do not attenuate troublesome crosscomponents, they can translate them in the ... 
Optimal Phase Kernels for TimeFrequency Analysis
(19960101)We consider the design of kernels for timefrequency distributions through the phase, rather than amplitude, response. While phase kernels do not attenuate troublesome crosscomponents, they can translate them in the ... 
OPTIMAL RECOVERY OF SIGNALS FROM LINEAR MEASUREMENTS AND PRIOR KNOWLEDGE (EXTRAPOLATION, DETERMINISTIC, BANDLIMITED, SPECTRAL, ESTIMATION)
(1985)The problem of bandlimited extrapolation is studied in a general framework of estimation of a signal in an ellipsoidal signal class from the value of a linear transformation. The dissertation deals with finitelength ... 
Optimal Reduced Rank TimeFrequency/Time Scale Quadratic Detectors
(19960120)Optimal detectors based on timefrequency/timescale representations (TFRs/TSRs) admit a representation in terms of a bank of spectrograms/scalograms that yields a large class of detectors. These range from the conventional ... 
Optimal reorientation of spacecraft using only control moment gyroscopes
(2007)Spacecraft reorientation can require propellant even when using gyroscopes since these have momentum saturation limits at which control is lost until thrusters are fired to desaturate them. To eliminate this need and thereby ... 
Optimal Routing and Power Allocation for Wireless Networks with Imperfect FullDuplex Nodes
(20130724)We study a wireless fullduplex network with imperfect interference cancellation and solve the routing and power allocation problem in this network. We use a model that focuses on the effects of fullduplex by including ... 
Optimal Sampling Strategies for Multiscale Models with Application to Network Traffic Estimation
(20031001)This paper considers the problem of determining which set of 2<sup><i>p</i></sup> leaf nodes on a binary multiscale tree model of depth N (<i>N</i>><i>p</i>) gives the best linear minimum meansquared estimator of the ... 
Optimal Sampling Strategies for Multiscale Stochastic Processes
(20060115)In this paper, we determine which nonrandom sampling of fixed size gives the best linear predictor of the sum of a finite spatial population. We employ different multiscale superpopulation models and use the minimum ... 
Optimal Sampling Strategies for Multiscale Stochastic Processes
(20041201)This paper studies multiscale stochastic processes which are random processes organized on the nodes of a tree. The random variables at different levels on the tree represent time series of samples of a stochastic process ... 
Optimal sensor placement for parameter identification
(2007)This thesis surveys methods for determining sensor locations which maximize the achievable accuracy in parameter estimation of differential equations. The approach considers the placement of sensors as an experimental ... 
Optimal Signaling Strategies for Symmetric and Asymmetric BitRate Communication Services in the Presence of Crosstalk
(19990115)We have invented a new modem technology for transmitting data on conventional telephone lines (twisted pairs) at high speeds. This discovery is timely, as new standards are being developed for this Digital Subscriber Line ... 
Optimal signaling techniques for crosstalkdominated communication channels
(2000)In many communication systems, multiple users share a precious resourcetransmission bandwidth. Proximity of user channels and suboptimal usage of transmission bandwidth leads to significant multiuser interference or ... 
Optimal starting conditions for the rendezvous maneuver: Analytical and computational approach
(2008)The threedimensional rendezvous between two spacecraft is considered: a target spacecraft on a circular orbit around the Earth and a chaser spacecraft initially on some elliptical orbit yet to be determined. The chaser ... 
Optimal stimulus coding by neural populations using rate codes
(20020920)We create a framework based on Fisher information for determining the most effective population coding scheme for representing a continuousvalued stimulus attribute over its entire range. Using this scheme, we derive ... 
OPTIMAL TRAJECTORIES FOR AEROASSISTED, NONCOPLANAR ORBITAL TRANSFER
(1987)This thesis considers both classical and minimax problems of optimal control arising in the study of noncoplanar, aeroassisted orbital transfer. The maneuver considered involves the transfer from a high planetary orbit to ... 
Optimal trajectories for hypervelocity flight
(1989)This thesis discusses optimal trajectories for hypervelocity flight of interest in aeroassisted orbital transfer. Both coplanar orbital transfer and noncoplanar orbital transfer are studied. For these cases, the GEOtoLEO ... 
Optimal trajectories for the aeroassisted flight experiment
(1993)The aeroassisted flight experiment (AFE) is to simulate a transfer from a geosynchronous Earth orbit (GEO) to a low Earth orbit (LEO). Specifically, the AFE spacecraft is released from the Space Shuttle and is accelerated ...