Search Results - (Author, Cooperation:D. Rasmussen)

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  1. 1
    C. Eliasmith ; T. C. Stewart ; X. Choo ; T. Bekolay ; T. DeWolf ; Y. Tang ; D. Rasmussen
    American Association for the Advancement of Science (AAAS)
    Published 2012
    Staff View
    Publication Date:
    2012-12-01
    Publisher:
    American Association for the Advancement of Science (AAAS)
    Print ISSN:
    0036-8075
    Electronic ISSN:
    1095-9203
    Topics:
    Biology
    Chemistry and Pharmacology
    Computer Science
    Medicine
    Natural Sciences in General
    Physics
    Keywords:
    *Behavior ; Brain/anatomy & histology/*physiology ; Humans ; *Models, Neurological ; Neural Networks (Computer) ; *Software
    Published by:
    http://www.aaas.org/

    Latest Papers from Table of Contents or Articles in Press
  2. 2
    F. Yue ; Y. Cheng ; A. Breschi ; J. Vierstra ; W. Wu ; T. Ryba ; R. Sandstrom ; Z. Ma ; C. Davis ; B. D. Pope ; Y. Shen ; D. D. Pervouchine ; S. Djebali ; R. E. Thurman ; R. Kaul ; E. Rynes ; A. Kirilusha ; G. K. Marinov ; B. A. Williams ; D. Trout ; H. Amrhein ; K. Fisher-Aylor ; I. Antoshechkin ; G. DeSalvo ; L. H. See ; M. Fastuca ; J. Drenkow ; C. Zaleski ; A. Dobin ; P. Prieto ; J. Lagarde ; G. Bussotti ; A. Tanzer ; O. Denas ; K. Li ; M. A. Bender ; M. Zhang ; R. Byron ; M. T. Groudine ; D. McCleary ; L. Pham ; Z. Ye ; S. Kuan ; L. Edsall ; Y. C. Wu ; M. D. Rasmussen ; M. S. Bansal ; M. Kellis ; C. A. Keller ; C. S. Morrissey ; T. Mishra ; D. Jain ; N. Dogan ; R. S. Harris ; P. Cayting ; T. Kawli ; A. P. Boyle ; G. Euskirchen ; A. Kundaje ; S. Lin ; Y. Lin ; C. Jansen ; V. S. Malladi ; M. S. Cline ; D. T. Erickson ; V. M. Kirkup ; K. Learned ; C. A. Sloan ; K. R. Rosenbloom ; B. Lacerda de Sousa ; K. Beal ; M. Pignatelli ; P. Flicek ; J. Lian ; T. Kahveci ; D. Lee ; W. J. Kent ; M. Ramalho Santos ; J. Herrero ; C. Notredame ; A. Johnson ; S. Vong ; K. Lee ; D. Bates ; F. Neri ; M. Diegel ; T. Canfield ; P. J. Sabo ; M. S. Wilken ; T. A. Reh ; E. Giste ; A. Shafer ; T. Kutyavin ; E. Haugen ; D. Dunn ; A. P. Reynolds ; S. Neph ; R. Humbert ; R. S. Hansen ; M. De Bruijn ; L. Selleri ; A. Rudensky ; S. Josefowicz ; R. Samstein ; E. E. Eichler ; S. H. Orkin ; D. Levasseur ; T. Papayannopoulou ; K. H. Chang ; A. Skoultchi ; S. Gosh ; C. Disteche ; P. Treuting ; Y. Wang ; M. J. Weiss ; G. A. Blobel ; X. Cao ; S. Zhong ; T. Wang ; P. J. Good ; R. F. Lowdon ; L. B. Adams ; X. Q. Zhou ; M. J. Pazin ; E. A. Feingold ; B. Wold ; J. Taylor ; A. Mortazavi ; S. M. Weissman ; J. A. Stamatoyannopoulos ; M. P. Snyder ; R. Guigo ; T. R. Gingeras ; D. M. Gilbert ; R. C. Hardison ; M. A. Beer ; B. Ren
    Nature Publishing Group (NPG)
    Published 2014
    Staff View
    Publication Date:
    2014-11-21
    Publisher:
    Nature Publishing Group (NPG)
    Print ISSN:
    0028-0836
    Electronic ISSN:
    1476-4687
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Keywords:
    Animals ; Cell Lineage/genetics ; Chromatin/genetics/metabolism ; Conserved Sequence/genetics ; DNA Replication/genetics ; Deoxyribonuclease I/metabolism ; Gene Expression Regulation/genetics ; Gene Regulatory Networks/genetics ; Genome/*genetics ; Genome-Wide Association Study ; *Genomics ; Humans ; Mice/*genetics ; *Molecular Sequence Annotation ; RNA/genetics ; Regulatory Sequences, Nucleic Acid/genetics ; Species Specificity ; Transcription Factors/metabolism ; Transcriptome/genetics
    Published by:
    http://www.nature.com/

    Latest Papers from Table of Contents or Articles in Press
  3. 3
    K. Lindblad-Toh ; M. Garber ; O. Zuk ; M. F. Lin ; B. J. Parker ; S. Washietl ; P. Kheradpour ; J. Ernst ; G. Jordan ; E. Mauceli ; L. D. Ward ; C. B. Lowe ; A. K. Holloway ; M. Clamp ; S. Gnerre ; J. Alfoldi ; K. Beal ; J. Chang ; H. Clawson ; J. Cuff ; F. Di Palma ; S. Fitzgerald ; P. Flicek ; M. Guttman ; M. J. Hubisz ; D. B. Jaffe ; I. Jungreis ; W. J. Kent ; D. Kostka ; M. Lara ; A. L. Martins ; T. Massingham ; I. Moltke ; B. J. Raney ; M. D. Rasmussen ; J. Robinson ; A. Stark ; A. J. Vilella ; J. Wen ; X. Xie ; M. C. Zody ; J. Baldwin ; T. Bloom ; C. W. Chin ; D. Heiman ; R. Nicol ; C. Nusbaum ; S. Young ; J. Wilkinson ; K. C. Worley ; C. L. Kovar ; D. M. Muzny ; R. A. Gibbs ; A. Cree ; H. H. Dihn ; G. Fowler ; S. Jhangiani ; V. Joshi ; S. Lee ; L. R. Lewis ; L. V. Nazareth ; G. Okwuonu ; J. Santibanez ; W. C. Warren ; E. R. Mardis ; G. M. Weinstock ; R. K. Wilson ; K. Delehaunty ; D. Dooling ; C. Fronik ; L. Fulton ; B. Fulton ; T. Graves ; P. Minx ; E. Sodergren ; E. Birney ; E. H. Margulies ; J. Herrero ; E. D. Green ; D. Haussler ; A. Siepel ; N. Goldman ; K. S. Pollard ; J. S. Pedersen ; E. S. Lander ; M. Kellis
    Nature Publishing Group (NPG)
    Published 2011
    Staff View
    Publication Date:
    2011-10-14
    Publisher:
    Nature Publishing Group (NPG)
    Print ISSN:
    0028-0836
    Electronic ISSN:
    1476-4687
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Keywords:
    Animals ; Disease ; *Evolution, Molecular ; Exons/genetics ; Genome/*genetics ; Genome, Human/*genetics ; Genomics ; Health ; Humans ; Mammals/*genetics ; Molecular Sequence Annotation ; Phylogeny ; RNA/classification/genetics ; Selection, Genetic/genetics ; Sequence Alignment ; Sequence Analysis, DNA
    Published by:
    http://www.nature.com/

    Latest Papers from Table of Contents or Articles in Press
  4. 4
    Nanna, L. C. ; Bush, R. L. ; Arajs, S. ; Rasmussen, D. H. ; Skodzinsky, M. J.

    [S.l.] : American Institute of Physics (AIP)
    Published 1991
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    A simple method of producing small nickel particles (〈1 μm) of narrow size distribution has been explored. The particles have been formed by stirring and heating (with reflux) a solution of nickel(II) chloride hexahydrate, sodium hydroxide, and a polyol (ethylene, tetraethylene, or polyethylene glycol) both in the presence and absence of an added surface active compound (polyvinylpyrrolidone). The polyol functions as a nonaqueous solvent and ultimately as a reducing agent through its thermal decomposition, reducing the nickel hydroxide suspension precipitated from the nickel(II) chloride hexahydrate with sodium hydroxide in solution. Sodium hydroxide serves also to catalyze the reductive reaction. Chief parameters influencing the mean size, distribution of sizes, and morphology of particles produced by this method are temperature of the reaction, selection of the solvent/reducing agent, concentration of the added surfactant, and concentrations of the reactants. The particles have been examined by scanning and transmission electron microscopies and x-ray diffraction. Magnetic measurements have been performed at room temperature in a vibrating sample magnetometer. Special consideration has been given to the coercivity and reduced remanence.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.348105

    Articles: DFG German National Licenses
  5. 5
    Staff View
    ISSN:
    1089-7623
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Electrical Engineering, Measurement and Control Technology
    Notes:
    The feasibility of electron density profile measurements using a heavy ion beam probe in high-temperature plasmas has been demonstrated earlier [J. Schwelberger et al., Bull. Am. Phys. Soc. 36, 2292 (1991); Yu. N. Dnestrovskij et al., Sov. J. Plasma Phys. 12, 130 (1986)]. Two algorithms were developed to obtain density profiles from the heavy ion beam probe on the Advanced Toroidal Facility (ATF). A comparison of the algorithms is presented with a detailed study of the errors involved in the measurements. The errors can be due to uncertainties in cross sections, electron temperature, the line average density measurement, and the ion trajectory calculations. The heavy ion beam probe density profile measurement is not very susceptible to errors as long as the electron temperature stays above 30 eV. If the electron temperature is below this value, a small uncertainty in the temperature introduces a large error in the density. Also, important for a good density profile measurement is the calculation of the correct ion trajectories. Examples of density profiles are shown for ECH plasmas on ATF together with a detailed error analysis. The heavy ion beam probe results are in good agreement with multichannel far-infrared laser interferometry and Thomson scattering results.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.1143671

    Articles: DFG German National Licenses
  6. 6
    Staff View
    ISSN:
    1089-7674
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    The Advanced Toroidal Facility (ATF) [Fusion Technol. 10, 179 (1986)] is the world's largest stellarator. It was designed and built to demonstrate high beta, steady-state operation in a toroidal confinement system. During its final operating period ATF achieved pulse lengths of over one hour (4667 s). The objectives of these experiments were (1) investigation of plasma performance at times that are long compared to the plasma/wall equilibrium time; (2) determination of plasma control and wall conditioning techniques; and (3) adaptation of plasma diagnostic and data acquisition systems to long-pulse operation. Other experiments have also extended earlier studies of dimensionless-parameter plasma confinement scaling. By employing two discrete electron cyclotron heating (ECH) frequencies (28 and 35 GHz), and by simultaneously modulating the ECH power, magnetic field, and plasma density, it has been possible to maintain fixed plasma beta and collisionality while modulating the normalized gyroradius. © 1995 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.871267

    Articles: DFG German National Licenses
  7. 7
    Goulding, R. H. ; Zinkle, S. J. ; Rasmussen, D. A. ; Stoller, R. E.

    [S.l.] : American Institute of Physics (AIP)
    Published 1996
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    A resonant cavity technique was used to measure the dielectric constant and loss tangent of ceramic insulators at a frequency near 100 MHz during pulsed fission reactor irradiation near room temperature. Tests were performed on single crystal and several different grades of polycrystalline Al2O3, MgAl2O4, AlN, and Si3N4. Lead shielding experiments were performed for some of the irradiations in order to examine the importance of gamma ray versus neutron irradiation effects. With the exception of AlN, the dielectric constant of all of the ceramics decreased slightly (〈0.2% change) during the pulsed fission reactor irradiation. The dielectric constant of AlN was observed to slightly increase during irradiation. Significant transient increases in the loss tangent to values as high as 6×10−3 occurred during pulsed reactor irradiation with peak ionizing and displacements per atom (dpa) radiation fields of 4.2×104 Gy/s and 2.4×10−6 dpa/s, respectively. The loss tangent measured during irradiation for the different ceramics did not show any correlation with the preirradiation or postirradiation values. Analysis of the results indicates that the transient increases in loss tangent are due to radiation induced increases in the electrical conductivity. The loss tangent increases were proportional to the ionizing dose rate in all materials except for AlN, which exhibited a dose rate exponent of ∼1.6. © 1996 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.361288

    Articles: DFG German National Licenses
  8. 8
    Kindsfather, R. R. ; Rasmussen, D. A. ; Murakami, M. ; Thomas, C. E. ; Painter, S. L. ; Hays, P. S. ; Morris, R. N. ; Tolnas, E. L.

    [S.l.] : American Institute of Physics (AIP)
    Published 1986
    Staff View
    ISSN:
    1089-7623
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Electrical Engineering, Measurement and Control Technology
    Notes:
    A two-dimensional Thomson scattering system is being designed for the Advanced Toroidal Facility (ATF) torsatron experiment. This system will provide electron temperature and density measurements at 15 points along a vertical chord with each shot from a two-dimensional Te and ne map of an ATF toroidal cross section can be obtained. The horizontal Thomson scattering viewing port is offset by 15° toriodally from the ports passing the vertical laser beam. Translating and rotating mirors will be used to relay light from the viewing port to the collection lens. This makes it possible to scan horizontally, view as much of the vertical laser beam as possible, and to use a fixed focal length, fixed position lens. Three sets of spectrometers optimized to three temperature ranges will be used. At the output of each spectrometer, dispersed light will be detected by an array of five, seven, or eight photomultiplier tubes, depending on the temperature range of the spectrometer.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.1139138

    Articles: DFG German National Licenses
  9. 9
    Staff View
    ISSN:
    1089-7623
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Electrical Engineering, Measurement and Control Technology
    Notes:
    Heating and current drive with ICRF is one of the major missions of TPX and is crucial to its success. In contrast to the integrated nature of core diagnostic programs, diagnostics that measure ICRF propagation and edge interactions are often assigned lower priority, have not been included in the base diagnositics set, or were included as upgrades. This can result in an incomplete and unoptimized set of measurements. Thus it is important that an integrated set of diagnostics (engineered along with the antenna design), capable of fully diagnosing the interaction, propagation, and absorption of the ICRF be available for TPX. The parameters of interest include: coupling of the ICRF antenna to the plasma, launched spectrum, wave propagation, edge plasma interactions, electron heating, and current drive, and fast ion power deposition and losses. The diagnostic set should be designed so it can be upgraded for control of loading and spectrum by providing feedback information for adjusting phase, power level, fuel gas injection, and plasma position. The proposed set focuses on wave propagation, launched spectrum, absorption, and measuring and comparing the plasma edge properties in the near vicinity of the antenna with that measured at a large toroidal distance from them; thus many would be installed as toroidally separated indentical sets. In addition to the planned core diagnostic set, the ICRF specific diagnostics proposed for TPX include: edge density reflectometers, RF fluctuation reflectometers, fixed and moveable Langmuir probes, visible and IR cameras with spectroscopic line filters, rf magnetic loop probes, local ion energy analyzer, direct ion loss detectors, charge exchange analyzers, fast response ECE, and edge temperature ECE. The anticipated approach is one in which individual diagnostics could be provided by industry, universities, or laboratories but overall coordination, driven by specific ICRF issues, would be required. © 1995 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.1146425

    Articles: DFG German National Licenses
  10. 10
    Hanson, G. R. ; Wilgen, J. B. ; Bigelow, T. S. ; Collazo, I. ; England, A. C. ; Murakami, M. ; Rasmussen, D. A. ; Wilson, J. R.

    [S.l.] : American Institute of Physics (AIP)
    Published 1995
    Staff View
    ISSN:
    1089-7623
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Electrical Engineering, Measurement and Control Technology
    Notes:
    Edge electron density profile measurements, including the scrape-off layer, have been made during ion cyclotron range of frequency (ICRF) heating with the two-frequency differential-phase reflectometer installed on an ICRF antenna on the Tokamak fusion test reactor (TFTR). This system probes the plasma using the extraordinary mode with two signals swept from 90 to 118 GHz, while maintaining a fixed-difference frequency of 125 MHz. The extraordinary mode is used to obtain density profiles in the range of 1×1011–3×1013 cm−3 in high-field (4.5–4.9 T) full-size (R0=2.62 m, a=0.96 m) TFTR plasmas. The reflectometer launcher is located in an ICRF antenna and views the plasma through a small penetration in the center of the Faraday shield. A 26-m-long overmoded waveguide run connects the launcher to the reflectometer microwave electronics. Profile measurements made with this reflectometer system will be presented along with a discussion of the characteristics of this differential phase reflectometer and data analysis. © 1995 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.1146187

    Articles: DFG German National Licenses
  11. 11
    Rasmussen, D. A. ; Kindsfather, R. R. ; Thomas, C. E. ; Gormley, R. P. ; Painter, S. L.

    [S.l.] : American Institute of Physics (AIP)
    Published 1988
    Staff View
    ISSN:
    1089-7623
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Electrical Engineering, Measurement and Control Technology
    Notes:
    The standard laser Thomson scattering calibration technique involves the convolving of density and wavelength response calibrations. This usually includes an in situ Rayleigh scattering from neutral gas for an absolute density calibration at the laser wavelength. In addition, a spectral calibration (i.e., a National Bureau of Standards traceable lamp and white reflective plate) is required to determine the relative wavelength channel responses for the combination of collection optics, spectrometers, and associated detectors. This technique involves a considerable amount of time and effort in two-dimensional scattering systems because of the number of spectrometers/detectors and the large range of scattering and collection angles. An alternative technique employing a nominal 40-mJ, small-divergence tunable dye laser substituted into the Thomson scattering laser beam path is proposed. Rayleigh scattering (from ∼10-Torr H2) measurements are made at a high repetition rate (1–10 Hz) while the dye laser output wavelength is scanned. This includes in one step the in situ density and channel response calibrations.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.1139689

    Articles: DFG German National Licenses
  12. 12
    Bell, G. L. ; Gandy, R. F. ; Wilgen, J. B. ; Rasmussen, D. A.

    [S.l.] : American Institute of Physics (AIP)
    Published 1988
    Staff View
    ISSN:
    1089-7623
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Electrical Engineering, Measurement and Control Technology
    Notes:
    Electron cyclotron emission (ECE) from the Advanced Toroidal Facility (ATF) torsatron will allow measurement of plasma electron temperature. For low-field operation (0.95 T) the second harmonic is cut off at a relatively low density; therefore, third-harmonic emission from 67 to 83 GHz is used to yield central electron temperatures. At high-field operation (1.9 T) second-harmonic emission from 82 to 114 GHz is optically thick and can provide Te(r) information. A vertical view of the saddle-point geometry of the ATF mod B spatial contours provides a line of sight along which the mod B contours are symmetric with respect to flux surfaces. A single horn–lens viewing beam system with a vertical view is designed to cover the entire 67–114-GHz range, providing a spot size on the order of 6 cm. Radiation will be delivered to one of three waveguide mixers by C-band waveguide. Each of the three mixers covers a 16-GHz segment of the emission spectrum, downconverting it to the 2–18-GHz intermediate-frequency band, where it is processed by a 16-channel array of bandpass filters, providing 1-GHz frequency resolution.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.1140163

    Articles: DFG German National Licenses
  13. 13
    Seth, Jayshree ; Padiyath, R. ; Rasmussen, D. H. ; Babu, S. V.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 1993
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    Diamond crystallites were deposited on single-crystal (100) silicon substrates by the KrF (248 nm) excimer laser ablation of pyrolytic graphite in an argon rf plasma ambient. No external heating or seeding of the rf biased substrates was used. The rf plasma ambient caused surface restructuring of the silicon substrate, presumably via sputtering, which facilitated the nucleation of 0.01–0.15 μm diamond crystallites. The diamond cubic structure was confirmed by transmission electron diffraction analysis. However, the Raman 1332 cm−1 mode, characteristic of diamond, was not detected. The rf bias accelerates the ions in the laser-induced plume and rf plasma discharge towards the substrate likely facilitate nucleation of the diamond phase on the restructured and roughened silicon substrate.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.110028

    Articles: DFG German National Licenses
  14. 14
    Rasmussen, D. A. ; Bigelow, T. S. ; Batchelor, D. B. ; Hillis, D. L. ; Haste, G. R. ; Quon, B. H. ; Hankins, O. E.

    [S.l.] : American Institute of Physics (AIP)
    Published 1985
    Staff View
    ISSN:
    1089-7666
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    The use of multiple-frequency microwave power for electron-cyclotron heating significantly increased the ring stored energy in the SM-1 simple mirror device. Multiple-frequency electron-cyclotron heating (MFECH) was used on the ELMO Bumpy torus (EBT) in an effort to increase its hot-electron beta. No substantial improvement in the ring parameters was observed in a series of two-frequency ECH experiments, with frequency separations up to 90 MHz, in contrast to the dramatic improvement found in the axisymmetric SM-1 experiment. The toroidal canting of the EBT mirror sectors introduces asymmetries that destroy the superadiabatic behavior of the energetic electrons, reduce microwave heating efficiency, and produce additional ring losses. These effects qualitatively explain the different multiple-frequency heating results obtained in EBT and SM-1.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.864937

    Articles: DFG German National Licenses
  15. 15
    Staff View
    ISSN:
    1089-7666
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    The ELMO Bumpy Torus (EBT) [Plasma Physics and Controlled Nuclear Fusion (IAEA, Vienna, 1975), Vol. II, p. 141] normally has an energetic electron ring in each of its 24 mirror sectors. The original intention of using this hot-electron population was to provide an average local minimum in the magnetic field (through its diamagnetism) to stabilize the simple interchange and flute modes, which otherwise are theoretically inherent in a closed-field-line bumpy torus. To study the confinement properties of a bumpy torus without the influence of hot-electron rings, a water-cooled stainless steel limiter in each mirror sector was extended into the plasma to the ring location; this eliminated the hot-electron ring population. These limiters were aptly named "ring killers.'' Electron temperature, density, space potential, and plasma fluctuations have been measured during the ring killer experiment and are compared to standard EBT operation. The results of these experiments indicate that the hot-electron rings in EBT do enhance the core plasma properties of EBT and do, in fact, reduce plasma fluctuations; however, these improvements are not large in magnitude. These measurements and recent theoretical models suggest that simple interchange/flute modes are stabilized, or fluctuation levels reduced, well before that condition is obtained for average minimum-B stabilization. Several possible mechanisms for this stabilization are discussed.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.865205

    Articles: DFG German National Licenses
  16. 16
    Rasmussen, D. H.

    College Park, Md. : American Institute of Physics (AIP)
    Published 1986
    Staff View
    ISSN:
    1089-7690
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Chemistry and Pharmacology
    Notes:
    Regular solution theory is used to develop the concentration dependence for both the equilibrium and dynamic surface tension of water–alcohol binary solutions. The equilibrium surface tensions of methanol–water, ethanol–water, and n-propanol–water binary solutions are used to fit the parameters of the theory and the dynamic surface tension is calculated. The dynamic surface tension compares favorably with the surface tension which fits classical nucleation theory vs composition at a nucleation rate of one nuclei per cubic centimeter per second.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.451123

    Articles: DFG German National Licenses
  17. 17
    Rasmussen, D. H.

    College Park, Md. : American Institute of Physics (AIP)
    Published 1986
    Staff View
    ISSN:
    1089-7690
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Chemistry and Pharmacology
    Notes:
    The energetics of cluster formation is evaluated for a supersaturated binary liquid–liquid system. Regular solution thermodynamics are combined with dynamic surface tension evaluation to determine cluster stability. The composition and size of the critical nucleus is predicted for several parent phase supersaturations at a reduced temperature of 0.9. These results while quite similar to the results of Reiss and Shugard are not in total agreement with this prior analysis. The results substantiate the need for a curvature dependent dynamic surface tension in nucleation theory.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.451124

    Articles: DFG German National Licenses
  18. 18
    Staff View
    ISSN:
    1089-7666
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    Runaway electron formation and confinement occur readily in pulsed torsatrons and heliotrons because of the high loop voltages during initiation and termination of the helical and vertical fields ("field ramping'') and the inherently good containment of the electrons on the flux surfaces in the vacuum fields. This has been confirmed for the Advanced Toroidal Facility (AFT) [Fusion Technol. 10, 179 (1986)] and other stellarators by orbit calculations. Since runaway electrons can cause an unacceptable level of hard x rays near the machine, a runaway electron suppression system was incorporated in ATF. The main component of the system is a movable paddle, which is normally left in the center of the plasma chamber during the field ramps. This device, in conjunction with programmed vertical field ramping, which reduces the volume of good flux surfaces, has proved to be very effective in reducing the runaway electron population. Measurements of hard x rays from ATF have shown that the runaway electrons are produced primarily during the field ramping but that there is usually also a small steady-state runaway electron component during the"flat-top'' portion of the fields. The paddle is the main source of the hard x radiation (thick-target bremsstrahlung). There is evidence that some of the runaway electrons may be confined to islands. The maximum x-ray energy found by pulse height analysis is ∼12–15 MeV. The mean energy appears to be a few million electron volts. There is a noticeable forward peaking of the bremsstrahlung from the paddle. The limiters do not appear to be major sources of x rays.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.859687

    Articles: DFG German National Licenses
  19. 19
    Staff View
    ISSN:
    1089-7666
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    The midplane microwave heating system in the ELMO Bumpy Torus (EBT) [in Proceedings of the Sixth International Conference on Plasma Physics and Controlled Nuclear Fusion Research, 1976 (IAEA, Vienna, 1977), Vol. II, p. 145] was supplemented with power launched from the high-field side of the fundamental resonance by an antenna in the magnet coil throat. Up to 43 kW of polarized (extraordinary mode), 28 GHz power was successfully launched with one antenna. Measurements were made of changes in the core and hot-electron ring plasma parameters when throat-launch power was added. In sharp contrast to initial expectations, the bulk core-plasma parameters were degraded while the ring parameters, in the launch cavity, were improved. These results are consistent with a modified picture of electron-cyclotron heating (ECH) in EBT. A picture of localized microwave absorption and particle losses is supported by additional measurements.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.865943

    Articles: DFG German National Licenses
  20. 20
    Rossmanith, W. G. ; Yen, S. S. C. ; Rasmussen, D. D.

    Oxford, UK : Blackwell Publishing Ltd
    Published 1990
    Staff View
    ISSN:
    1365-2826
    Source:
    Blackwell Publishing Journal Backfiles 1879-2005
    Topics:
    Medicine
    Notes:
    An in vitro perifusion system employing very frequent (30 s) perifusate collectionswas utilized to investigate the relationship between pulsatile release of luteinizing hormone (LH) and immunoreactive β-endorphin (iβ-END) during individual perifusions of adult human anterior hemipituitaries. Each of six hemipituitaries released LH and iβ-END in a distinctlypulsatile fashion, with pulses occurring approximately every 3.2 min for each. Power spectral analysis revealed that pulsatile release of both LH and iβ-END occurred in a rhythmic pattern, with a periodicity of 3.1 and 3.2 min, respectively, and that the periodicity of pulsatile LH and iβ-END release was correlated within individual perifusions. Moreover, the relative amplitudes (% change) of the synchronous LH and iβ-END pulses were correlated. The effluent fractions from two of the perifusions were also assessed for thyrotropin, and it was determinedthat thyrotropin pulses were synchronized to both LH and iβ-END pulses. These studies confirm that LH and iβ-END are released from human anterior pituitaries in vitro in an intrinsically pulsatile fashion, and demonstrate that the LH and iβ-END pulses tend to occur rhythmically and in synchrony and proportion with each other. Furthermore, correlation of thyrotropin pulses to both the LH and iβ-END pulses suggests a common fundamental intrapituitary pulse generating mechanism.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1111/j.1365-2826.1990.tb00398.x

    Articles: DFG German National Licenses