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Creator | Title | Description | Subject | Date |
| 1 |
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Miller, Joel Steven | 1H NMR investigation of the magnetic spin configuration in the molecule-based ferrimagnet [MnTFPP][TCNE] | 1H NMR line-shape measurements have been performed in the linear chain molecule-based ferrimagnet [MnTFPP][TCNE].xPhMe (TFPP=tetrakis(4-fluorophenyl)porphinato; TCNE=tetracyanoethylene) as a function of temperature. Hyperfine shifts of opposite sign were observed indicating the presence of two oppo... | Magnetization; Magnets; Paramagnetic | 2002 |
| 2 |
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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 |
| 3 |
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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 |
| 4 |
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Miller, Joel Steven | Charge transfer complexes of 2,4,6-tricyano-s-triazine with tetrathiafulvalene (TTF) and N,N,N' ,N'-tetramethyl-p-phenylenediamine (TMPD) | Reaction of 2,4,6-tricyano-s-triazine (TCT) with tetrathiafulvalene (TTF) and N,N,N',N'-tetramethylp-phenylenediamine (TMPD) leads to 1 : 1 charge transfer complexes. The crystal structures of the TTF[TCT], as well as the decomposition product due to hydrolysis of the [TMPD][TCT], i.e. HTMPD]+[2,4-d... | Electron; Solution; Hydrolysis | 2002 |
| 5 |
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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 |
| 6 |
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Coley, Phyllis D.; Kursar, Thomas A. | Effects of weather on fungal abundance and richness among 25 communities in the Intermountain West | Because moisture and temperature influence the growth of fungi, characterizing weather conditions favorable for fungi may be used to predict the abundance and richness of fungi in habitats with different climate conditions. To estimate habitat favorability to fungi, we examined the relationship of f... | Intermountain West; Utah; Microclimate; Fungal prevalence | 2002 |
| 7 |
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Ehleringer, James R. | Evaluación de la capacidad estacional de utilizar eventos de preciptación en tres especies de arbustos nativos de Chile con distintos sistemas radiculares | Se evaluó la capacidad estacional de utilizar un evento de precipitación en tres especies arbustivas con diferentes sistemas radiculares (dimórficos: Balbisia peduncularis, Senna cumingii; profundo: Haplopappus parvifolius) en la Quebrada El Romeral, norte-centro de Chile. El sitio posee un clima... | Fuentes de agua; Proporción de isótopos estables; Sistema radicular; Desertificación; Zonas áridas; Chile; Water sources; Stable isotopes ratio; Root system; Arid zone; Balbisia peduncularis; Senna cummingii; Haplopappus parvifolius | 2002 |
| 8 |
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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 |
| 9 |
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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 |
| 10 |
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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 |
| 11 |
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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 |
| 12 |
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Carrier, David R. | Functional tradeoffs in specialization for fighting versus running | Both locomotion and fighting are critical to survival and reproductive fitness in many vertebrate species. Yet, characters that make an individual good at fighting may, in many cases, limit locomotor performance and vice versa. Here I describe tests of three functional tradeoffs in the limb muscles ... | Greyhounds; Pit Bulls; Australopithecus; Homo; Fighting; Running; Male-male aggression; Limb muscles; Functional tradeoff | 2002 |
| 13 |
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Armentrout, Peter B. | Guided ion beam studies of the reaction of Nin+ (n=2-16) with D2: nickel cluster-deuteride bond energies | The kinetic-energy dependences of the reactions of Nin+ (n=2-16) with D2 are studied in a guided ion beam tandem mass spectrometer. The products observed are NinD+ for all clusters and NinD2 + for n=5-16. Reactions for formation of NinD+ are observed to exhibit thresholds, whereas cross sections for... | Metal clusters; Nickel ions; Bond energies; Deuterides; Collision-induced dissociation; Endothermic reactions | 2002 |
| 14 |
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Armentrout, Peter B. | Guided ion beam studies of the reactions of Vn+ (n = 2-13) with D2: cluster-deuteride bond energies as a chemical probe of cluster electronic structure | The kinetic energy dependencies of the reactions of Vn+ (n=2 - 13) with D2 are studied in a guided ion beam tandem mass spectrometer. Products observed are VnD1 for all clusters and VnD2 + for n=4 - 13. All reactions are observed to exhibit thresholds, except for formation of VnD2 + for n =4,5,7,9,1... | Metal clusters; Vanadium ions; Bond energies; Endothermic reactions; Collision-induced dissociation; Transition metal ions; Deuterides | 2002 |
| 15 |
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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 |
| 16 |
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Clayton, Dale H. | Influence of bill shape on ectoparasite load in Western Scrub-Jays | Populations of the Western Scrub-Jay (Aphelocoma californica) have bills specialized for feeding in their respective habitats. Populations in oak habitat have hooked bills, whereas those in pinyon habitat have pointed bills with a reduced maxillary overhang. Work on other bird species shows that the... | Ectoparasite load; Bill shape; Aphelocoma californica | 2002 |
| 17 |
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Miller, Joel Steven | Innovation in crystal engineering | The first CrystEngComm discussion meeting on crystal engineering has demonstrated that the field has reached maturity in some areas (for example: design strategies, characterization of solid compounds, topological analysis of weak and strong non-covalent interactions), while the quest for novel pro... | Research; Design; Molecular | 2002 |
| 18 |
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Ehleringer, James R. | Interspecific competition and resource pulse utilization in a cold desert community | In desert ecosystems a large proportion of water and nitrogen is supplied in rain-induced pulses. It has been suggested that competitive interactions among desert plants would be most intense during these pulse periods of high resource availability. We tested this hypothesis with three cold desert s... | Atriplex confertifolia; Chrysothamnus nauseosus; Colorado Plateau; desert; Gutierrezia sarothrae; Neighbor removal; Plant competition; Resource pulses; Pulse utilization; Stable isotopes; Water uptake | 2002 |
| 19 |
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Miller, Joel Steven | Isolation of two salts from the reduction of TCNE with [(n-C3H7)4N]I. A further example of long 2.87 Ã pi-C-C bonding in pi-[TCNE]22- | Reduction of tetracyanoethylene, TCNE, with tetrakis(n-propyl)ammonium iodide, [Pr4N]I, results in a new example of long pi*-CC bonded pi-[TCNE]22- dimers with a 2.870(4) A(°) intradimer CC bond, which is structurally and spectroscopically characterized. This reaction also results in isolation of ... | Synthesis; Intradimer; Crystals | 2002 |
| 20 |
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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 |
| 21 |
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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 |
| 22 |
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Beckerle, Mary C. | Members of the zyxin family of LIM proteins interact with members of the p130cas family of signal transducers | Integrin binding to extracellular matrix proteins induces formation of signaling complexes at focal adhesions. Zyxin co-localizes with integrins at sites of cellsubstratum adhesion and is postulated to serve as a docking site for the assembly of multimeric protein complexes involved in regulating ce... | Zyxin; Actin; LIM domains; Trip6; Focal adhesions | 2002 |
| 23 |
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Capecchi, Mario R. | Mice lacking endothelial angiotensin-converting enzyme have a normal blood pressure | To test the hypothesis that local vascular production of angiotensin II is necessary for the normal regulation of blood pressure, we engineered a new line of genetically altered mice that lack endothelial angiotensin-converting enzyme (ACE). This was accomplished using a novel strategy of targeted... | | 2002 |
| 24 |
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Seger, Jon | Models of sex ratio evolution | Our understanding of sex ratio evolution depends strongly on models that identify: (1) constraints on the production of male and female offspring, and (2) fitness consequences entailed by the production of different attainable brood sex ratios. Verbal and mathematical arguments by, among others, D... | Fitness; Species; Sex-allocation | 2002 |
| 25 |
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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 |
