UScholar Works
 
Filters: Date: "1998" Format: "application/pdf" Collection: "ir_uspace"
101 - 125 of 127
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CreatorTitleDescriptionSubjectDate
101 Morse, Michael DavidResonant two-photon ionization spectroscopy of jet-cooled RuCA resonant two-photon ionization study of the jet-cooled RuC molecule has identified the ground state as a 1?+ state arising from the 10?211?25rr42?4 configuration. The 3?i state arising from the 10?211?25rr42?312?1 configuration lies very low in energy, with the 3?3 and 3?2 components lying only 76...1998
102 Ehleringer, James R.Responses of boreal conifers to climate fluctuations: indications from tree-ring widths and carbon isotope analysesSpatial distribution and species composition of the boreal forest are expected to change under predicted climate change scenarios. Current research indicates that water limitations control the southern boundary of the central Canadian boreal forest and temperature limitations control the northern b...Boreal forests; Carbon budget; Picea mariana; Pinus banksiana; Carbon isotopes1998
103 Zick, Cathleen D.Review of the economics of family time useTime is a limited resource. Yet, it is also the one resource with which all individuals are equally endowed on any given day. Why then is there such wide variation in how each of us chooses to use that time? What factors guide our decisions about time spent working versus time spent with family and...1998
104 Kowaleski-Jones, LoriSex, contraception and childbearing among high-risk youth: do different factors influence males and females?During adolescence, many young people begin to experiment with new roles. One important area of exploration is sexual activity, which involves a certain amount of risk-taking.1998
105 Shirley, Peter S.; Parker, Steven G.Single sample soft shadowsA simple extension to ray tracing is presented that creates visually plausible "soft" shadows with little extra computation. Although these soft shadows are approximate, they are robust and have penumbra widths that behave in a believable way, including accurate placement of singularities where penu...Soft shadows; Ray tracing; Penumbra width; Image generation1998
106 Henderson, Thomas C.; Thompson, William B.Smart sensor snowWe propose to deploy and exploit and large number of inexpensive sensors to obtain information or trigger actions over a wide geographic area. Sensors may be of diverse physical natures: acoustic, IR, seismic, chemical, magnetic, thermal, etc. We describe here three major issues: (1) sensor distribu...Smart sensors1998
107 Veranth, John M.; Pershing, David W.; Sarofim, Adel F.Sources of unburned carbon in the fly ash produced from low-NOx pulverized coal combustionThe unburned carbon in the fly ash produced from low-NOx pulverized coal combustion is shown to consist of a mixture of soot and coal char. The soot was identified by the presence of chains or aggregates of 10-50-nm-diameter primary particles in electron microscope images of both laboratory sample...Unburned carbon; Char1998
108 Armentrout, Peter B.Statistical modeling of competitive threshold collision-induced dissociationCollision-induced dissociation of (R1OH)Li+(R2OH) with xenon is studied using guided ion beam mass spectrometry. R1OH and R2OH include the following molecules: water, methanol, ethanol, 1-propanol, 2-propanol, and 1-butanol. In all cases, the primary products formed correspond to endothermic loss of...Collision-induced dissociation; Xenon ions; Alcohols1998
109 Stringfellow, Gerald B.Step structure and ordering in GaInPPresents information from an experiment on the step structure and ordering in GalnP. Information on the step spacing and degree of order in the epitaxial layers; Details on the experiment; Results from the experiment.Physics; Ordering; Steps1998
110 Stringfellow, Gerald B.Step structure and ordering in Te-doped GaInPThe step structure and CuPt ordering in GaInP layers grown by organometallic vapor phase epitaxy on singular GaAs substrates have been investigated as a function of Te (DETe) doping using atomic force microscopy, and electrical and optical properties measurements. The degree of order decreases for T...Surfaces; Te doping; Bandgap energy1998
111 Miller, Joel StevenStructure and magnetic properties of MnII[N(CN)2]2(pyrazine). An antiferromagnet with an interpenetrating 3-D network structureMn[N(CN)2]2(pyz) (pyz = pyrazine) orders antiferromagnetically at low temperature and possesses intralayer u-NCNCN and interlayer u-pyz ligands that form a pseudo-ReO3 interpenetrating network structure.Dicyanamide; Polydentate; Temperature1998
112 Normann, Richard A.; Shah, Maulik R.Study of printed spiral coils for neuroprosthetic transcranial telemetry applicationsWe have explored the use of printed spiral coils (PSC's) for neuroprosthetic transcranial telemetry applications. We fabricated two-dimensional PSC's on a thin (25 microns) polyimide substrate using copper (35 microns) as a conducting material. All the coils had a fixed inner diameter of 1.0 cm. We ...Blindness; Neuroprosthesis; Transcranial Telemetry System; Prosthesis Design1998
113 Miller, Joel Steven; Epstein, Arthur J.Tetracyanoethylene-based organic magnetsSeveral classes of organic magnets based upon the tetracyanoethenide radical anion, [TCNE](.-), either unbound, (u), and (u4) bonded to zero, two and four metal sites have been reported. The putative (u4) bonded V(TCNE)x room temperature magnet has been extended to include M(TCNE)x(M = Mn, Fe, Co,...Magnetization; Magnetic ordering; Oxidation1998
114 Couldwell, William T.Transfacet pedicle-sparing approach for thoracic disc removal: cadaveric morphometric analysis and preliminary clinical experienceA number of operative techniques have been described for the treatment of herniated thoracic discs. The transfacet pedicle-sparing approach allows for complete disc removal with limited spinal column disruption and soft-tissue dissection. Fifteen cadaveric spinal columns were used for evaluation of...Thoracic spine; Herniated thoracic discs; Intervertebral disc herniation; Discectomy; Pedicle; Radiculopathy; Myelopathy1998
115 Williams, Clayton C.Two step dopant diffusion study performed in two dimensions by scanning capacitance microscopy and TSUPREM IVWe report the results of a two-step two- dimensional (2D) diffusion study by scanning capacitance microscopy (SCM) and 2D SUPREM IV process simulation. A quantitative 2D dopant profile of a gate-like structure is measured with the SCM on a cross-sectioned polished silicon wafer. The gate-like struct...Scanning capacitance microscopy; SCM; Doping1998
116 Morse, Michael DavidTwo-photon ionization spectroscopy and all-electron ab initio study of LiCaResonant two-photon ionization spectra of LiCa have been obtained from a laser vaporization, supersonic expansion source. The ground state of the molecule is confirmed to be X 2?+. Three band systems have been observed near 15 282, 19 310, and 22 250 cm-1 and the upper states have been assigned as 2...1998
117 Hymas, Weston C.Ultrasonic enhancement of antibiotic action on several species of bacteriaThe effect of the antibiotics gentamicin, streptomycin, kanamycin, tetracycline, and ampicillin on planktonic cultures of Enterobacter aerogenes, Serratia marcescens, Salmonella derby, Streptococcus mitis, and Staphylococcus epidermidis with and without an application of 70 kHz ultrasound was studi...Enterobacter aerogenes; Serratia marcescens; Salmonella derby; Streptococcus mitis; Staphylococcus epidermidis; Planktonic cultures; Gentamicin; Streptomycin; Kanamycin; Tetracycline; Ampicillin; Ultrasonic enhancement; Bioacoustic effect1998
118 Mattis, Daniel C.Uses of quantum field theory in diffusion-limited reactionsThe techniques of quantum field theory on a lattice are used to examine the diffusion and reaction processes of particles in a solid, such as vacancies or interstitials, or chemical species of all kinds which move by discrete random hopping processes and react in a prescribed way when they are in pr...Recombination; Dynamics; Equation1998
119 Martin, JimValidation of a mathematical model for road cycling powerThis investigation sought to determine if cycling power could be accurately modeled. A mathematical model of cycling power was derived, and values for each model parameter were determined. A bicycle-mounted power measurement system was validated by comparison with a laboratory ergometer.Aerodynamic drag; Rolling resistance; Air velocity; Gradient; Cycling power; Potential energy; Kinetic energy1998
120 Goller, FranzVibratory behavior of the sound generating structures of the bird syrinxRecent endoscopic studies of the bird syrinx during phonation suggest that sound is generated by vibrating membrane folds or labia (Goller and Larsen, J. exp. Biol., 200, 2165-2176, 1997; Goller and Larsen, Proc. Natl. Acad. Sci., 4,14787-14791, 1997) and not by a whistle mechanism (Nottebohm, J. ...Vocalization; Vibration detector; Whistle mechanism1998
121 Shirley, Peter S.; Thompson, William B.Visual glueOne key function of graphics systems is to present information about the 3-D structure of modeled environments. For real-time simulations, conveying a sense of contact between touching surfaces and relative position and motion between proximate objects is particularly critical. Neither stereo nor oc...Visual glue; 3-D structure1998
122 Battin, Margaret P.What are the potential cost savings from legalizing physician-assisted suicide?Quill decisions rejecting a constitutional right to physician-assisted suicide, the Supreme Court allowed each state to decide whether to legalize the intervention. In state legislatures rather than courtrooms, factual claims about the probable extent and implications of permitting physician-assi...Managed Care Programs; Cost of Illness; Home Care Services1998
123 Battin, Margaret P.What are the potential cost savings from legalizing physician-assisted suicide?IN the Washington v. Glucksberg and Vacco v. Quill decisions rejecting a constitutional right to physician-assisted suicide, the Supreme Court allowed each state to decide whether to legalize the intervention.1 In state legislatures rather than courtrooms, factual claims about the probable extent ...1998
124 Jorgensen, ErikWormwholes: a commentary on K. F. Schaffner's "Genes, behavior, and developmental emergentismAlthough Caenorhabditis elegans was chosen and modified to be an organism that would facilitate a reductionist program for neurogenetics, recent research has provided evidence for properties that are emergent from the neurons. While neurogenetic advances have been made using C elegans which may be u...Organism; Neurons; Genotype1998
125 Olivera, Baldomero M.; Hillyard, David R.; Gray, William Robertĸ-Conotoxin PVIIA is a peptide inhibiting the Shaker K+ channelĸ-Conotoxin PVIIA (k-PVIIA), a 27-amino acid toxin from Conus purpurascens venom that inhibits the Shaker potassium channel, was chemically synthesized in a biologically active form. The disulfide connectivity of the peptide was determined. ĸ-Conotoxin PVIIA has the following structure.Conotoxins; k-Conotoxin PVIIA; Conus purpurascens1998
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