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| Creator | Title | Description | Subject | Date | ||
|---|---|---|---|---|---|---|
| 1 |
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Saam, Brian | 3He spin exchange cells for magnetic resonance imaging | We present a protocol for the consistent fabrication of glass cells to provide hyperpolarized (HP) 3He for pulmonary magnetic resonance imaging. The method for producing HP 3He is spin-exchange optical pumping. The valved cells must hold of order 1 atm.L of gas at up to 15 atm pressure. Because char... | 3He; Spin exchange cells; Hyperpolarized 3He; Pulmonary magnetic resonance imaging; Spin-exchange optical pumping; SEOP; Glass cells | 2002 |
| 2 |
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Lupton, John Mark | Bright electroluminescence from a conjugated dendrimer | Photoluminescence and electroluminescence (EL) from a conjugated dendrimer consisting of three distyrylbenzene units linked by a central nitrogen atom as core and meta-linked biphenyl units as dendrons were investigated. The conjugated dendrimer emits green light and shows photoluminescence quantum ... | Conjugated dendrimer | 2002 |
| 3 |
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Ailion, David Charles | Dynamics of the pinned modulation wave in incommensurate bis (4-chlorophenyl) sulfone (BCPS) | We show that both the anomalously huge resonance-frequency dependence of the 3 5Cl nuclear quadrupole resonance (NQR) spin-lattice relaxation time in BCPS, reported here for the first time, and its anomalous temperature dependence can be explained by large-scale fluctuations of the pinned modulation... | NQR; Spin-lattice; Relaxation-time; Pinned modulation wave | 2002 |
| 4 |
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Vardeny, Zeev Valentine; Raikh, Mikhail E. | Evidence for braggoriton excitations in opal photonic crystals infiltrated with highly polarizable dyes | We studied angle-dependent reflectivity spectra of opal photonic crystals infiltrated with cyanine dye aggregates, which are highly polarizable media with very large Rabi frequency. We show that, at resonance condition between the exciton-polariton of the dye aggregate and the Bragg gap, the Bragg s... | Braggoriton excitations; Opal photonic crystals; Cyanine dye aggregates; Bragg; Photonic band-gap; PBG; Polarizable dyes | 2002 |
| 5 |
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Vardeny, Zeev Valentine; Raikh, Mikhail E. | Excitations in opal photonic crystals infiltrated with polarizable media | Photonic crystals (PC) are a class of artificial structures with a periodic dielectric function. PCs can be a laboratory for testing fundamental processes involving interactions of radiation with matter in novel conditions. We have studied the optical properties of opal PCs that are infiltrated with... | Opal photonic crystals; Polarizable media; Bragg gap; Polaritonic gap; Photonic stop band | 2002 |
| 6 |
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Lupton, John Mark | Exciton confinement in organic dendrimer quantum wells for opto-electronic applications | Organic dendrimers are a fascinating new class of materials for opto-electronic applications. We present coupled electronic oscillator calculations on novel nanoscale conjugated dendrimers for use in organic light-emitting diodes. Strong confinement of excitations at the center of the dendrimers is ... | Exciton confinement; Opto-electronic applications; Coupled electronic oscillator | 2002 |
| 7 |
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Lupton, John Mark | Frequency up-conversion as a temperature probe of organic opto-electronic devices | Frequency up-conversion is demonstrated in a polyfluorene-based conjugated polymer. Up-converted emission is observed upon excitation to the red of the 0-0 luminescence band. The emission intensity depends strongly on temperature and provides an accurate probe of the operating temperature of organic... | Frequency up-conversion; Organic opto-electronic devices | 2002 |
| 8 |
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Sokolsky, Pierre | High Resolution Fly's Eye - status and preliminary results on cosmic ray composition above 10^18 eV | We describe the current status of the High Resolution Fly's Eye detector. Event reconstruction and associated systematics for stereo reconstruction are discussed and recent preliminary results on the study of the composition of ultra-high energy cosmic rays by the Xmax method are presented. These r... | Ultra-high energy cosmic rays; Fluorescence; Stereo detection | 2002 |
| 9 |
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Boehme, Christoph | Light-intensity and temperature dependence of trap-dangling bond recombination in hydrogenated microcrystalline silicon | A quantitative study of the trap-dangling bond tunneling recombination in hydrogenated microcrystalline silicon (μc-Si:H) is presented. The transition coefficients were measured at various light exposures and temperatures between T= 10 K and T= 140 K using time-domain measurements of spin-dependen... | Hydrogenated microcrystalline silicon; Spin-dependent recombination | 2002 |
| 10 |
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Dawson, Kyle | Masses of high-redshift clusters via SZ effect observations | We present Sunyaev-Zel'dovich Effect (SZE) observations of distant, highly X-ray luminous clusters of galaxies. We use the SZE data to constrain their total masses, independent of X-ray observations. To do this, we assume the clusters have the same gas mass fraction as that derived from SZE measure... | Sunyaev-Zel'dovich Effect; X-rays; Redshift | 2002 |
| 11 |
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Lupton, John Mark | Molecular thermometer based on long-lived emission from platinum octaethyl porphyrin | A highly sensitive molecular thermometer based on platinum octaethyl porphyrin, which can be employed in a range of environments, is presented. The thermal activation of the emission spectrum results in a change in emission intensity by an order of magnitude over a temperature range of 45 K about ro... | Molecular thermometer; Platinum octaethyl porphyrin | 2002 |
| 12 |
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Vardeny, Zeev Valentine | Multiple resonances in microdisk lasers of ∏-conjugated polymers | We have fabricated microdisk lasers from p-conjugated polymers that show multiline emission spectrum upon optical excitation. Using Fourier transform analysis, each emission line is assigned integer to an interger Bessel function that helps to estimate the field distribution inside the photoexcited ... | Multiple resonances; Microdisks; Microdisk lasers; pi-conjugated polymers | 2002 |
| 13 |
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Lupton, John Mark | On-chain defect emission in electroluminescent polyfluorenes | We present time-resolved photoluminescence measurements on a range of poly- and oligofluorenes with different molecular weights in both dilute solution and thin films. The commonly observed parasitic broad green emission band, which has previously been attributed to an excimer, is identified in all... | Defect emission; Parasitic broad green emission band | 2002 |
| 14 |
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Williams, Clayton C. | Single electron tunneling to insulator surfaces detected by electrostatic force | The detection of single-electron tunneling events between a metallic scanning probe tip and an insulating surface is demonstrated by an electrostatic force method. When a voltage-biased oscillating atomic force microscopy tip is placed within tunneling range of the surface of an insulator, single... | Single electron; Tunneling events; Scanning tunneling microscope | 2002 |
| 15 |
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Symko, Orest George | Size considerations in interfacing thermoacoustic coolers with electronics | Small thermoacoustic coolers heat pumps show much promise for heat management in microcircuits, especially since they can be miniaturized for interfacing with circuits. Usually they are operated in the resonant mode with sound pumping heat; the device dimensions are reduced when the acoustic pump fr... | Thermoacoustic coolers; Heat management; Microcircuits; Miniturization | 2002 |
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