Search Results - (Author, Cooperation:A. Carlson)
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1Latest Papers from Table of Contents or Articles in PressSarah E. Graham, Richard D. Smith and Heather A. Carlson
American Chemical Society (ACS)
Published 2018Staff ViewPublication Date: 2018-01-17Publisher: American Chemical Society (ACS)Topics: Chemistry and PharmacologyPublished by: -
2Latest Papers from Table of Contents or Articles in PressStaff View
Publication Date: 2018-06-27Publisher: American Chemical Society (ACS)Topics: Chemistry and PharmacologyPublished by: -
3Latest Papers from Table of Contents or Articles in PressB. A. Carlson ; S. M. Hasan ; M. Hollmann ; D. B. Miller ; L. J. Harmon ; M. E. Arnegard
American Association for the Advancement of Science (AAAS)
Published 2011Staff ViewPublication Date: 2011-04-30Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: Animal Communication ; Animals ; *Biological Evolution ; Electric Fish/*anatomy & histology/classification/genetics/*physiology ; Electric Stimulation ; *Electricity ; *Genetic Speciation ; Mesencephalon/*anatomy & histology/cytology ; Organ Size ; Phylogeny ; Sense Organs ; Sensory Receptor Cells/*cytology ; Species SpecificityPublished by: -
4Latest Papers from Table of Contents or Articles in PressBrian J. Yanites, Nate A. Mitchell, Joshua C. Bregy, Grace A. Carlson, Kirstyn Cataldo, Margaret Holahan, Graham H. Johnston, Amelia Nelson, Jeffery Valenza, Matt Wanker
Wiley-Blackwell
Published 2018Staff ViewPublication Date: 2018-01-31Publisher: Wiley-BlackwellPrint ISSN: 0197-9337Electronic ISSN: 1096-9837Topics: GeographyGeosciencesPublished by: -
5Latest Papers from Table of Contents or Articles in PressD. Floudas ; M. Binder ; R. Riley ; K. Barry ; R. A. Blanchette ; B. Henrissat ; A. T. Martinez ; R. Otillar ; J. W. Spatafora ; J. S. Yadav ; A. Aerts ; I. Benoit ; A. Boyd ; A. Carlson ; A. Copeland ; P. M. Coutinho ; R. P. de Vries ; P. Ferreira ; K. Findley ; B. Foster ; J. Gaskell ; D. Glotzer ; P. Gorecki ; J. Heitman ; C. Hesse ; C. Hori ; K. Igarashi ; J. A. Jurgens ; N. Kallen ; P. Kersten ; A. Kohler ; U. Kues ; T. K. Kumar ; A. Kuo ; K. LaButti ; L. F. Larrondo ; E. Lindquist ; A. Ling ; V. Lombard ; S. Lucas ; T. Lundell ; R. Martin ; D. J. McLaughlin ; I. Morgenstern ; E. Morin ; C. Murat ; L. G. Nagy ; M. Nolan ; R. A. Ohm ; A. Patyshakuliyeva ; A. Rokas ; F. J. Ruiz-Duenas ; G. Sabat ; A. Salamov ; M. Samejima ; J. Schmutz ; J. C. Slot ; F. St John ; J. Stenlid ; H. Sun ; S. Sun ; K. Syed ; A. Tsang ; A. Wiebenga ; D. Young ; A. Pisabarro ; D. C. Eastwood ; F. Martin ; D. Cullen ; I. V. Grigoriev ; D. S. Hibbett
American Association for the Advancement of Science (AAAS)
Published 2012Staff ViewPublication Date: 2012-06-30Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: Basidiomycota/classification/*enzymology/*genetics ; Bayes Theorem ; *Evolution, Molecular ; *Genome, Fungal ; Indoles ; Lignin/*metabolism ; Peroxidases/*genetics/metabolism ; Wood/metabolismPublished by: -
6Articles: DFG German National LicensesStaff View
ISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: A variety of diagnostics measure fluctuating quantities at a small number of locations. A common method to estimate the wave-number spectrum S(k) at a given frequency is to make many measurements of the "local'' wave number kl, which is the phase difference between two locations divided by their separation. The random-phase model allows the synthesis of a typical signal from a given S(k). We apply local wave-number analysis to such synthetic signals and show that, in the limit of small separation, the power-weighted mean of kl accurately reflects the mean of S(k), and the width of the distribution is exactly (large-closed-square) times smaller than the width of S(k). We also show that no information on the shape of S(k) exists in the measurements. Finally, we generalize these results to finite separations, finite measurement volumes, and any number of locations.Type of Medium: Electronic ResourceURL: -
7Articles: DFG German National LicensesStaff View
ISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: The spatial and temporal variation of a fluctuating quantity can often be described with sufficient accuracy as a sum of independent modes, whose powers are given by a function S(k) for each frequency. Many diagnostics are restricted to making measurements at two points, so that a determination of S(k) by spatial Fourier transformation is not possible. Nevertheless, in the limit of point measurements with infinitesimal separation, the mean wave number k¯ and the rms deviation σ about the mean can be exactly determined by repeated measurements of the phase difference between the tips. If the separation is finite, the method can be extended in such a way that the correct results are obtained for any separation as long as S(k) is Gaussian. For other spectral shapes, the error in the measurement of k¯ may be of the order of σ, and the fractional error in the measurement of σ may be substantial. A finite measurement volume reduces the sensitivity to short wavelength modes. Under certain assumptions, the measured values can be adjusted to yield better estimates of k¯ and σ.Type of Medium: Electronic ResourceURL: -
8Articles: DFG German National LicensesStaff View
ISSN: 1089-7674Source: AIP Digital ArchiveTopics: PhysicsNotes: Standard Langmuir probe analysis interprets the entire voltage drop to occur in the sheath and neglects any voltage drop due to bulk resistivity. In a magnetized plasma this implies a strong mechanism to damp the E×B drift around the probe's flux tube. Application of linearized magnetohydrodynamics to the bulk plasma allows the consideration of a variety of geometries and damping mechanisms on an equal footing and the treatment of plasma turbulence without the inappropriate recourse to anomalous transport coefficients. An analytic expression for the apparent temperature determined by long flush mounted Langmuir probes can be found if the boundary conditions are also linearized. The friction on neutrals is always stronger than viscosity and is able to account for all the I–V characteristics measured in the ASDEX Upgrade [M. Kaufmann et al., Plasma Physics and Controlled Fusion 35, 205 (1993)] divertor. At all but the lowest densities, the polarization term associated with E×B drifts is stronger still. © 2001 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
9Articles: DFG German National LicensesStaff View
ISSN: 1089-7674Source: AIP Digital ArchiveTopics: PhysicsNotes: Due to the high heat flux to the target plates of present day divertor tokamaks, the use of thermally robust flush mounted Langmuir probes becomes more and more important. The surface normal of the probe defines a direction in space which is generally neither parallel nor perpendicular to the magnetic field, and the angle between these two vectors plays an important role for the physics in front of the probe. An analytic description of the sheath physics in front of a target plate is presented, and a model for the analysis of the I–V characteristics of such probes is derived therefrom. The model includes, on the one hand, considerably more physics than previous descriptions, and is, on the other hand, much simpler and more practical than numerical solutions and simulations. Subsequently the application of this model to triple probes is discussed. It will become evident that flush mounted probes can be used as reliably as domed probes to determine the plasma parameters in front of the target plates. © 1997 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
10Articles: DFG German National LicensesChandler, G. A. ; Aubert, J. ; Bailey, J. ; Carlson, A. ; Derzon, D. ; Derzon, M. ; Dukart, R. ; Humphreys, R. ; Hunter, J. ; Johnson, D. J. ; Matzen, M. K. ; Moats, A. ; Olson, R. ; Pantuso, J. ; Rockett, P. ; Ruiz, C. ; Sawyer, P. ; Torres, J. ; Hussey, T.
[S.l.] : American Institute of Physics (AIP)
Published 1992Staff ViewISSN: 1089-7623Source: AIP Digital ArchiveTopics: PhysicsElectrical Engineering, Measurement and Control TechnologyNotes: Particle Beam Fusion Accelerator II is a light-ion fusion accelerator that is presently capable of irradiating a 6-mm-diam sphere with ∼50 kJ of 5.5-MeV protons in ∼15 ns. An array of particle and x-ray diagnostics fielded on proton Inertial Confinement Fusion target experiments quantifies the incident particle beam and the subsequent target response. An overview of the ion and target diagnostic setup and capabilities will be given in the context of recent proton beam experiments aimed at studying soft x-ray emission from foam-filled targets and the hydrodynamic response of exploding-pusher targets. Ion beam diagnostics indicate ∼100 kJ of proton beam energy incident within a 1.2-cm radius of the center of the diode with an azimuthal uniformity which varied between 6% and 29%. Foam-filled target temperatures of 35 eV and closure velocities of 4 cm/μs were measured.Type of Medium: Electronic ResourceURL: -
11Articles: DFG German National LicensesLapin, S. N. ; Cooper, G. W. ; Davis, L. ; Bailey, J. E. ; Stygar, W. A. ; Carlson, A. ; Reyes, P.
[S.l.] : American Institute of Physics (AIP)
Published 1992Staff ViewISSN: 1089-7623Source: AIP Digital ArchiveTopics: PhysicsElectrical Engineering, Measurement and Control TechnologyNotes: The CR-39/range-filter technique measures ion energy by determining the maximum filter thickness which ions can penetrate. CR-39 located behind the filter records the ions. This method is used to measure peak voltage in pulsed power accelerators. We investigated range and straggling effects in this diagnostic by exposing it to 8- and 15-MeV protons for both Al and Ta filters. The range agreed with published values to better than ±6%. The range straggling decreased for higher incident ion energy and lower atomic number, as expected, although there were differences up to a factor of 1.7 between the experimental values and predictions. The dependence of the track diameter distribution on ion energy enabled us to establish a signature which is characteristic of ions which penetrate a filter, via straggling. These results can be used to evaluate the errors present when this diagnostic is used to measure accelerator voltage.Type of Medium: Electronic ResourceURL: -
12Articles: DFG German National LicensesBailey, J. E. ; Adams, R. ; Carlson, A. L. ; Ching, C. H. ; Filuk, A. B. ; Lake, P.
[S.l.] : American Institute of Physics (AIP)
Published 1997Staff ViewISSN: 1089-7623Source: AIP Digital ArchiveTopics: PhysicsElectrical Engineering, Measurement and Control TechnologyNotes: Stark-shift measurements using emission spectroscopy are a powerful tool for advancing understanding in many plasma physics experiments. We use simultaneous two-dimensional space- and time-resolved spectra to study the electric field evolution in the 20 TW Particle Beam Fusion Accelerator II ion diode acceleration gap. Fiber optic arrays transport light from the gap to remote streaked spectrographs operated in a multiplexed mode that enables recording time-resolved spectra from eight spatial locations on a single instrument. Design optimization and characterization measurements of the multiplexed spectrograph properties include the astigmatism, resolution, dispersion, and sensitivity. A semiautomated line-fitting procedure determines the Stark shift and the related uncertainties. Fields up to 10 MV/cm are measured with an accuracy ±2%–4%. Detailed tests of the procedure confirm that the uncertainty in the wavelength-shift error bars is less than ±20%. Development of an active spectroscopy probe technique that uses laser-induced fluorescence from an injected atomic beam to obtain three-dimensional space- and time-resolved measurements of the electric and magnetic fields is in progress. © 1997 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
13Articles: DFG German National LicensesLeeper, R. J. ; Bailey, J. E. ; Carlson, A. L. ; Chandler, G. A. ; Derzon, M. S. ; Dukart, R. J. ; Hebron, D. E. ; Hunter, J. A. ; Mix, L. P. ; Moats, A. R. ; Nash, T. J. ; Olson, W. R. ; Rockett, P. D. ; Ruiz, C. L. ; Torres, J. A. ; Wenger, D. F. ; Olsen, R. W. ; Barber, T. L. ; Lake, P. W. ; Schmidlapp, F. A.
[S.l.] : American Institute of Physics (AIP)
Published 1995Staff ViewISSN: 1089-7623Source: AIP Digital ArchiveTopics: PhysicsElectrical Engineering, Measurement and Control TechnologyNotes: A review of the diagnostics used at Sandia National Laboratories to measure the parameters of intense lithium ion-beam hohlraum target experiments on Particle Beam Fusion Accelerator II will be presented. This diagnostic package contains an extensive suite of x-ray spectral and imaging diagnostics that enable measurements of target temperature and x-ray output. The x-ray diagnostics include time-integrated and time-resolved pinhole cameras, energy-resolved one-dimensional streaked imaging diagnostics, time-integrated and time-resolved grazing incidence spectrographs, a transmission grating spectrograph, an elliptical crystal spectrograph, a bolometer array, an 11- element x-ray diode array, and an 11-element PIN diode detector array. The incident Li beam symmetry and an estimate of incident Li beam power density can be measured from ion beam-induced characteristic x-ray line emission and neutron emission. © 1995 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
14Articles: DFG German National LicensesBailey, J. ; Carlson, A. L. ; Morrison, R. L. ; Maron, Y.
[S.l.] : American Institute of Physics (AIP)
Published 1990Staff ViewISSN: 1089-7623Source: AIP Digital ArchiveTopics: PhysicsElectrical Engineering, Measurement and Control TechnologyNotes: We describe a new visible spectroscopy diagnostic system for measuring plasma properties in the PBFA II applied-B ion diode. The system transports light from the ion diode to a remote screen room where it is recorded by a spectrograph coupled to a streak camera. We developed extensive calibration techniques for measuring the collection efficiency into the fiber link, the effects of the background bremsstrahlung radiation on the fibers, the fiber transmission as a function of wavelength, and the absolute streaked-spectrograph sensitivity as a function of wavelength. We have recorded time-dependent spectral line profiles and intensities from the PBFA II plasma opening switch, the beam-transport gas cell, and the anode plasma. The Stark shift of the LiI 2s-2p transition observed on LiF-anode shots shows that the time-resolved electric field peaks at 7–8 MV/cm, the highest field ever measured using the Stark effect. The potential of these measurements to expand our knowledge of ion-diode physics is being explored.Type of Medium: Electronic ResourceURL: -
15Articles: DFG German National LicensesDerzon, M. ; Aubert, J. ; Bailey, J. ; Carlson, A. ; Chandler, G. ; Derzon, D. ; Dukart, R. ; Humphreys, R. ; Hunter, J. ; Johnson, D. ; Matzern, K. ; Mix, P. ; Moats, A. ; Olson, R. ; Pantuso, J. ; Rockett, P. ; Ruiz, C. ; Sawyer, P. ; Torres, J. ; Hussey, T.
[S.l.] : American Institute of Physics (AIP)
Published 1992Staff ViewISSN: 1089-7623Source: AIP Digital ArchiveTopics: PhysicsElectrical Engineering, Measurement and Control TechnologyNotes: We performed experiments using proton beams to heat foam-filled cylinders on the Particle Beam Fusion Acceleration II. Preliminary analysis of these diagnostic results provides reasonable agreement between prediction and experiment. The diagnostic package allowed us to benchmark target response as well as diagnose driver performance. Soft x-ray images, both time and space resolved, and the results of broadband spectral measurements on bolometers and x-ray diodes provide qualitative agreement with LASNEX predictions of target features such as Au motion and soft x-ray emission profile. The analysis is consistent with a total beam deposition of 40–50 kJ and power depositions of approximately 180 TW/g. Estimates of target motion confirm the ability of the foam to retard wall motion.Type of Medium: Electronic ResourceURL: -
16Articles: DFG German National LicensesStaff View
ISSN: 1750-3841Source: Blackwell Publishing Journal Backfiles 1879-2005Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, NutritionProcess Engineering, Biotechnology, Nutrition TechnologyType of Medium: Electronic ResourceURL: -
17Articles: DFG German National LicensesWynberg, Hans ; Meijer, E. W. ; Hummelen, J. C. ; Dekkers, H. P. J. M. ; Schippers, P. H. ; Carlson, A. D.
[s.l.] : Nature Publishing Group
Published 1980Staff ViewISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] Firefly larvae (Fig. 1) were gathered in the US and sent by airmail to The Netherlands. They were alive up to and during most of the experiments. In our first attempts to detect polarization of luminescence, we measured the total light emission from both lanterns of the larvae. The results were ...Type of Medium: Electronic ResourceURL: -
18Articles: DFG German National LicensesStaff View
ISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] Fig. 1 Effects of isosmotic dilution on action and resting potentials. Isosmicity (1,024 mOsm) was maintained by addition of sucrose to the physiological saline. The intracellular recordings were made with conventional glass microelectrodes (10-20 MO tip resistance) from the paired giant axons (30 ...Type of Medium: Electronic ResourceURL: -
19Articles: DFG German National LicensesStaff View
ISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] MEN of science at the symposium on "Life at High Altitudes and Aviation Medicine" held at the University of Chicago on September 23 as part of the University's fiftieth anniversary celebration heard dissertations ranging from a description of an "Altitude Human Race" to the physiology of the free ...Type of Medium: Electronic ResourceURL: -
20Articles: DFG German National LicensesStaff View
ISSN: 0021-9673Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: Chemistry and PharmacologyType of Medium: Electronic ResourceURL: