UScholar Works
 
Filters: Date: "1997" Collection: "ir_uspace"
101 - 125 of 157
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CreatorTitleDescriptionSubjectDate
101 Vardeny, Zeev ValentineOptical probes of pristine and C60-doped silicon-bridged PT polymer; a novel highly luminescent, low bandgap polymerSilicon bridged PT polymer (PTSi) is a new soluble polymer with a strong luminescence in the infrared band (0-0 transition at 1.6 eV). We have applied various spectroscopies such as absorption, electroabsorption (EA), photo induced absorption (PA), electromodulated PA (EPA), photoluminescence (PL) a...Silicon bridged PT polymer; Low bandgap pi-conjugated polymer; C60 doping; Electric field induced exciton dissociation1997
102 Morse, Michael DavidOptical spectroscopy of jet-cooled FeC between 12 000 and 18 100 cm-?Iron monocarbide has been investigated between 12 000 and 18 100 cm21 in a supersonic expansion by resonant two-photon ionization spectroscopy. Six new electronic states have been identified for which origins relative to the ground state have been determined. Three of these possess ?"=3, one possess...1997
103 Vardeny, Zeev ValentineOptical studies of ordered and disordered α-sexithiophene filmsWe have studied α-sexithiophene (α-6T) films by photoinduced absorption (PA) and optically-detected magnetic resonance (ODMR). The PA of the disordered film is composed of two polaron PA bands and one bipolaron PA band, each with its own vibronic side bands. Measurements of an ordered film indicat...Optically detected magnetic resonance; Sexithiophene conjugated oligomer1997
104 Stringfellow, Gerald B.Order and surface processes in III-V semiconductor alloysSemiconductor alloys have become increasingly useful during the last four decades because, through the use of alloys, the properties of semiconductors can be tailored by varying the composition to precisely match the requirements for specific electronic and photonic devices.Semiconductor alloys; Transmission-electron-diffraction pattern; Organometallic Vaper-phase epitaxy1997
105 Miller, Jan D.Particle size segregation on a belt conveyorParticle size segregation is a common phenomenon in many particulate processes and has many undesirable effects. The size segregation which occurs on a belt conveyor causes a serious problem for on-line particle size measurement using image-based techniques. Whether particle size distributions mea...Particles; Size; Belt conveyors; Modelling1997
106 Chuaqui, Miguel BasimPenumbraI grew up in Chile during the 70's, and early 80's, a time of political upheaval and economic distress in Chile, and this has probably exerted as strong an influence on my musical outlook as any other aspect of Chilean culture. While I distrust "political art," I do have an abiding desire for my mu...1997
107 Mathews, V. JohnPerceptually lossless image compressionThere are many instances in which human observers are the final judges of the quality of a compressed image. In such situations, it is useful to incorporate a model of the human visual system (HVS) into the image compression system in order to reduce or even eliminate the visual distortions introdu...1997
108 Vardeny, Zeev Valentine; Ehrenfreund, Eitan A.Phonon spectroscopy in π-conjugated polymers; the role of the excited electronic statesThe Raman active vibrational modes in 7r-conjugated polymers are known to have different frequencies in different types of experiments. The best known examples are the resonant Raman scattering (RRS) and doping or photoinduced absorption infrared active vibrations (IRAV) measurements, in which the s...pi-conjugated polymers; Phonon spectroscopy; Resonant Raman scattering; ir-active phonons1997
109 Vardeny, Zeev ValentinePhotoexcitations in disubstituted acetylene polymersWe have used a variety of optical techniques to study the photoexcitations dynamics in several disubstituted acetylene polymer thin films. We found that although these polymers have a degenerate ground state, as determined by iodine doping and C6Q photodoping, they show strong photoluminescence (PL)...Photoexcitations; Disubstituted acetylene polymers; Trans-Polyacetylene; Electron-electron interactions1997
110 Bohs, Lynn A.Phylogenetic relationships in Solanum (Solanaceae) based on ndhF sequencesA phylogenetic analysis was conducted using sequence data from the chloroplast gene ndhF. Sequences were obtained from 25 species of Solanaceae, including 18 species of Solanum representing five of the seven conventionally recognized subgenera.Solanum; ndhF1997
111 Tasdizen, TolgaPIMs and invariant parts for shape recognitionWe present completely new very powerful solutions t o two fundamental problems central to computer vision. 1. Given data sets representing C objects to be stored in a database, and given a new data set for an object, determine the object in the database that is most like the object measured. We so...1997
112 Brown, Barbara B.Post-occupancy evaluation of wayfinding in a pediatric hospital: research findings and implications for instructionA post-occupancy evaluation (POE) of way finding in a new pediatric hospital pointed to a wide range of areas where wayfinding aids could be improved. After initial walk-through evaluation tours and meetings with administrators, five more systematic methods were used to assess problems: staff and vi...Hospitals; Wayfinding; Signage1997
113 Brunvand, Erik L.Practical advances in asynchronous designRecent practical advances in asynchronous circuit and system design have resulted in renewed interest by circuit designers. Asynchronous systems are being viewed as in increasingly viable alternative to globally synchronous system organization. This tutorial will present the current state of the art...1997
114 Gesteland, Raymond F.; Atkins, John F.; Felden, Brice; McCutcheon, John P.Probing the structure of the Escherichia coli 10Sa RNA (tmRNA)The conformation of the Escherichia coli 10Sa RNA (tmRNA) in solution was investigated using chemical and enzymatic probes. Single- and double-stranded domains were identified by hydrolysis of tmRNA in imidazole buffer and by lead(II)-induced cleavages. Ribonucleases T1 and S1 were used to map unpai...Covariation; Pseudoknot; Structural Probing; 10Sa RNA; tmRNA1997
115 Couldwell, William T.Prognostic variables in surgery for skull base meningiomasThe authors have retrospectively analyzed selected surgical and pathological observations made among a group of 20 patients harboring recurrent cranial base meningiomas in an attempt to reveal which factors may be important in predicting tumor recurrence. This cohort was compared with a group of 3...Skull base; Prognostic factor; Recurrence1997
116 Horch, Kenneth W.Proposed specifications for a lumbar spinal cord electrode array for control of lower extremities in paraplegiaThe goal of the study was to provide specifications for a stimulating electrode array to be implanted in the lumbosacral spinal cord as part of a functional neuromuscular stimulation (FNS) system for control of lower extremity muscles in paralyzed individuals. Dual channel stimulation of the qua...Stimulating electrode array; FNS; Functional neuromuscular stimulation1997
117 Francis, Leslie; Battin, Margaret P.; Botkin, Jeffrey R.; Jacobson, Jay A.Quick easy questions for analyzing medical ethical casesSometimes, traditional philosophical ways of analyzing medical-ethics cases seem just too cumbersome, particularly to people without training in ethical theory. The issues are important, interesting, often compellingly engaging. But it isn't the time for heavy jargon, or terms like "deontology" or ...1997
118 Battin, Margaret P.; Francis, Leslie P.; Jacobson, Jay A.Quick easy questions for analyzing medical ethics casesSometimes, traditional philosophical ways of analyzing medical-ethics cases seem just too cumbersome, particularly to people without training in ethical theory. The issues are important, interesting, often compellingly engaging. but it isn't the time for heavy jargon, or terms like "deontology" or "...1997
119 Vardeny, Zeev Valentine; Gellermann, WernerRaman scattering gain in DOO-PPV filmsWe have investigated the optical emission characteristics of poly(2,5-dioctyloxy-p-phenylenevinylene) (DOO-PPV) thin films under high intensity ps pulsed laser excitation (Ipump > 1 MW/ cm2). We observed that the emission spectrum consist of a spectrally narrowed emission (SNE) band (FWHM ~ 10 nm)...DOO-PPV; Raman scattering gain; Stimulated emission; Strongly coupled vibrations1997
120 Jacobson, HansRealizing burstmode circuits via STG speed independent synthesisThis report discusses the similarities and differences of STG and Burstmode specifications and synthesis methods. The first part of the report examines the applicability and efficiency of STG's single controller fork-join concurrency ability versus Burstmode's partitioned fork-join concurrency appr...Burstmode circuits; STG1997
121 Miller, Jan D.Removal of volatile organic compounds from contaminated water using air-sparged hydrocyclone stripping technologyThe air-sparged hydrocyclone (ASH) technology offers the unique opportunity to achieve efficient removal of volatile organic compounds (VOCs) from contaminated water at a high specific capacity, more than 100 times that of conventional air stripping technologies. VOC stripping is the first applicati...Air-sparged hydrocyclone; Air stripping; Contaminated water1997
122 Morse, Michael DavidResonant two-photon ionization spectroscopy of LiCuJet-cooled LiCu has been investigated using resonant two-photon ionization spectroscopy. A long vibrational progression was observed and identified as the [20.5] 1?+? X 1?+ band system. Ten bands of the system were rotationally resolved for 7Li63Cu, giving bond lengths of r0=2.2618(3) ? for the X 1?...1997
123 Bernstein, Paul S.Retinal tubulin binds macular carotenoidsPURPOSE: To investigate the biochemical mechanisms responsible for the specific uptake, concentration, and stabilization of the carotenoids lutein and zeaxanthin in the macula. METHODS: Soluble extracts of bovine retina mixed with radioactive carotenoids were purified by hydrophobic interaction, ion...Chromatography, Gel; Electrophoresis; Xanthophylls1997
124 White, Nicholas P.Review of Mary Margaret McCabe, "Plato's individualsThis book is an exploration of themes in Plato's metaphysics and epistemology from the Meno through his latest works. McCabe argues that Plato was interested, with increasing explicitness over his lifetime, in questions concerning what it is to be an individual. This interest led him, she maintains,...Individuality; Identity; Unity1997
125 Downes, Stephen M.Review of Peter Galison and David Stump, Disunity of scienceMost of the essays in this collection were originally delivered as papers at a conference on the disunity of science held at Stanford University in 1991.Ampere; Scientific work, Science in French society1997
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