UScholar Works
 
Filters: Collection: "ir_uspace"
201 - 225 of 305
Number of results to display per page
CreatorTitleDescriptionSubjectDate
201 Vardeny, Zeev ValentineExperimental determination of the charge/neutral branching ratio η in the photoexcitation of ∏-conjugated polymers by broadband ultrafast spectroscopyWe demonstrate a long-sought reliable method for determining the important branching ratio η between photogenerated charged polarons and neutral excitons in ∏-conjugated polymer films and solutions, using femtosecond transient photomodulation spectroscopy with broad spectral range from 0.14 to ...pi-conjugated polymers; Charge/neutral branching ratio; Photoexcitation; nu value; Broadband ultrafast spectroscopy2007-02
202 Couldwell, William T.; Chin, Steven S.Extranodal NK/T-cell lymphoma presenting as a pituitary massExtranodal NK/T-cell lymphomas are uncommon neoplasms that are highly aggressive and show a strong association with Epstein-Barr virus. They most commonly affect the nasal cavity and paranasal sinuses; manifestation as a primary pituitary tumor has never been described. The authors report a case of ...2007-09
203 Bernstein, Paul S.HPLC measurement of ocular carotenoid levels in human donor eyes in the lutein supplementation era.PURPOSE: A substantial proportion of the population at risk for visual loss from age-related macular degeneration consumes supplements containing high doses of lutein, but clinical studies to date have shown only modest and variable increases in macular carotenoid pigments in response to supplementa...Chromatography, High Pressure Liquid; Dietary Supplements; Tissue Donors2007-02
204 Vardeny, Zeev Valentine; Ehrenfreund, Eitan A.Illumination-induced metastable polaron-supporting state in poly(p-phenylene vinylene) filmsWe found an illumination-induced metastable polaron-supporting state in films of a soluble derivative of poly-p-phenylene vinylene (MEH-PPV). Pristine, nonilluminated MEH-PPV polymer films do not show longlived photogenerated polarons. Prolonged UV illumination, however, is found to induce a revers...Metastable polaron-supporting state; Poly(p-phenylene vinylene); PPV; MEH-PPV; Excitons2007-07
205 Furse, Cynthia M.Improving communication skills through project-based learningIn 2006, a program geared towards integrating technical communication and teamwork within engineering at the University of Utah was initiated. The program's aim was to improve communication education using technical course assignments, thereby avoiding the addition of a technical elective to an alre...2007-06
206 Zhdanov, Michael S.Integral electric current method in 3-D electromagnetic modeling for large conductivity contrastAbstract-We introduce a new approach to 3-D electromagnetic (EM) modeling for models with large conductivity contrast. It is based on the equations for integral current within the cells of the discretization grid, instead of the electric field or electric current themselves, which are used in the c...Electromagnetic modeling; integral electric current method; 3-D modeling; high conductivity contrast; integral equations2007-05
207 Hansen, Charles D.; Wald, IngoInteractive isosurface ray tracing of time-varying tetrahedral volumesAbstract- We describe a system for interactively rendering isosurfaces of tetrahedral finite-element scalar fields using coherent ray tracing techniques on the CPU. By employing state-of-the art methods in polygonal ray tracing, namely aggressive packet/frustum traversal of a bounding volume hierarc...2007-11
208 Hansen, Charles D.; Wald, IngoInteractive ray tracing of arbitrary implicits with SIMD interval arithmeticWe present a practical and efficient algorithm for interactively ray tracing arbitrary implicit surfaces. We use interval arithmetic (IA) both for robust root computation and guaranteed detection of topological features. In conjunction with ray tracing, this allows for rendering literally any progr...2007-09
209 Goller, FranzLateralization as a symmetry breaking process in birdsongThe singing by songbirds is a most convincing example in the animal kingdom of functional lateralization of the brain, a feature usually associated with human language. Lateralization is expressed as one or both of the bird's sound sources being active during the vocalization. Normal songs require ...Lateralization; Syringeal muscles; Respiration; Gating2007-03
210 Balasubramonian, RajeevLeveraging 3D technology for improved reliabilityAggressive technology scaling over the years has helped improve processor performance but has caused a reduction in processor reliability. Shrinking transistor sizes and lower supply voltages have increased the vulnerability of computer systems towards transient faults. An increase in within-die an...Reliability; Redundant multi-threading, 3D die-stacking; Parameter variation; Soft errors; Dynamic timing errors; Power-efficient microarchitecture; On-chip temperature2007-12
211 Harrison, Reid R.Low-power STDR CMOS sensor for locating faults in aging aircraft wiringA CMOS sensor used to locate intermittent faults on live aircraft wires is presented. A novel architecture was developed to implement the Sequence Time Domain Reflectometry method on a 0.5- m integrated circuit. The sensor locates short or open circuits on active wires with an accuracy of +/-1 ft w...CMOS sensor; Pseudo-random noise; Reflectometry Methods; Spread spectrum; Wire fault location; Time Domain Vernier (TDV) method2007-01
212 Mattis, Daniel C.Magnetic susceptibilities of finite Ising chains in the presence of defect sitesAny antiferromagnet with zero net magnetic moment exhibits limited response to an external homogeneous magnetic field. This changes dramatically in the presence of defect sites, even those that carry no spin. We examine the excess susceptibilities, longitudinal and transverse, due to one or more d...Antiferromagnets; Defects; Ising chain; Longitudinal field; Transverse field2007-12
213 Scarpulla, MichaelMagnetocrystalline anisotropy and magnetization reversal in Ga1-xMnxP synthesized by ion implantation and pulsed-laser meltingWe report the observation of ferromagnetic resonance (FMR) and the determination of the magnetocrystalline anisotropy in (100)-oriented single-crystalline thin film samples of Ga1−xMnxP with x=0.042. The contributions to the magnetic anisotropy were determined by measuring the angular and the te...Magnetocrystalline anisotropy; GaMnAs; Gallium arsenide2007-06
214 Liu, FengMechanism for nanotube formation from self-bending nanofilms driven by atomic-scale surface-stress imbalanceWe demonstrate, by theoretical analysis and molecular dynamics simulation, a mechanism for fabricating nanotubes by self-bending of nanofilms under intrinsic surface-stress imbalance due to surface reconstruction. A freestanding Si nanofilm may spontaneously bend itself into a nanotube without exter...Nanotube formation; Self-bending nanofilms; Surface-stress imbalance2007-04
215 Vardeny, Zeev Valentine; Nahata, AjayMidinfrared optical response and thermal emission from plasmonic lattices on Al filmsWe studied the midinfrared optical transmission and thermal light emission spectra of subwavelength hole arrays in the form of square lattice with 4 µm periodicity (plasmonic lattice) in aluminum films deposited on silicon substrates. The optical transmission of these films showed temperature inde...Plasmonic lattices; Midinfrared optical response; Thermal emission; Surface plasmon polaritons; Anomalous transmission; Extraordinary optical transmission; EOT2007-11
216 Gerton, JordanNanoscale fluorescence imaging using a single-wall carbon nanotubeA single-wall carbon nanotube attached to an AFM probe is used for near-field optical imaging of 20 nm diameter fluorescent spheres and 5 nm diameter CdSe quantum dots.2007-05
217 McElreath, RichardNew methods in quantitative ethnography: economic experiments and variation in the price of equalityA new method for quantitatively documenting concerns for economic fairness has the potential for identifying variation in prosociality within and across societies. Multiple dictator games conducted in two small-scale societies presented decision makers with a choice between an equitable and an ine...Inequality; Payoffs; Prosociality2007-12
218 Vardeny, Zeev ValentineNonlinear optical spectroscopy of excited states in polyfluoreneWe used a variety of nonlinear optical (NLO) spectroscopies to study the singlet excited-state order and primary photoexcitations in polyfluorene, an important blue-emitting ∏-conjugated polymer. The polarized NLO spectroscopies include ultrafast pump-probe photomodulation in a broad spectral rang...pi-conjugated polymers; Polyfluorene; Photoexcitations2007-03
219 Gerton, JordanOptimizing contrast of tip-enhanced fluorescence microscopy for imaging high-density samplesQuantum dots are imaged using tip-enhanced fluorescence microscopy. Optimization of the operation parameters leads to high-contrast images of high-density samples and a novel photon analysis improves contrast further.2007-05
220 Balasubramonian, RajeevOptimizing NUCA organizations and wiring alternatives for large caches with CACTI 6.0A significant part of future microprocessor real estate will be dedicated to L2 or L3 caches. These on-chip caches will heavily impact processor performance, power dissipation, and thermal management strategies. There are a number of interconnect design considerations that influence power/performanc...CACTI 6.0; Non-uniform cache architectures (NUCA); Cache models; Memory hierarchies; On-chip interconnects2007-12
221 Freire, JulianaOrganizing hidden-web databases by clustering visible web documentsIn this paper we address the problem of organizing hidden-Web databases. Given a heterogeneous set of Web forms that serve as entry points to hidden-Web databases, our goal is to cluster the forms according to the database domains to which they belong. We propose a new clustering approach that mode...Hidden-web databases; Web documents2007-04
222 Vardeny, Zeev Valentine; Ehrenfreund, Eitan A.Polaron spin-lattice relaxation time in ∏-conjugated polymers from optically detected magnetic resonanceWe describe a method for obtaining the polaron spin-lattice relaxation time TSL in ∏-conjugated polymers by measuring the optically detected magnetic resonance (ODMR) dynamics as a function of microwave power and laser intensity. The peculiar ODMR dynamics is well described by a spin dependent re...pi-conjugated polymers; Optically detected magnetic resonance; ODMR; MEH-PPV2007-10
223 Hall, ThadPoll workers and the vitality of democracy: an early assessmentThe aftermath of the 2000 election has been a time of constant learning in regards to election administration in the United States. Both scholars and policy makers initially focused primarily on voting technology and on which voting technologies were best at capturing votes. In early 2001, the Calte...2007-10
224 Balasubramonian, RajeevPower efficient approaches to redundant multithreadingNoise and radiation-induced soft errors (transient faults) in computer systems have increased significantly over the last few years and are expected to increase even more as we move toward smaller transistor sizes and lower supply voltages. Fault detection and recovery can be achieved through redund...Reliability; Power; Transient faults; Soft errors; Redundant multithreading (RMT); Heterogeneous chip multiprocessors dynamic frequency scaling2007-08
225 Freire, Juliana; Silva, Claudio T.Provenance for visualizations: reproducibility and beyondThe demand for the construction of complex visualizations is growing in many disciplines of science, as users are faced with ever increasing volumes of data to analyze. The authors present VisTrails, an open source provenance-management system that provides infrastructure for data exploration and ...Provenance management; Reproducibility; VisTrails; Pipelines2007-09
201 - 225 of 305