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Sample records for temporal flow variations

  1. Spatial and temporal variations in indoor environmental conditions...

    Office of Scientific and Technical Information (OSTI)

    conditions, human occupancy, and operational characteristics in a new hospital building Prev Next Title: Spatial and temporal variations in indoor environmental...

  2. Temporal Velocity Variations beneath the Coso Geothermal Field...

    Open Energy Info (EERE)

    Temporal Velocity Variations beneath the Coso Geothermal Field Observed using Seismic Double Difference Tomography of Compressional and Shear Wave Arrival Times Jump to:...

  3. Pedestrian flow characterization based on spatio-temporal Voronoi tessellations

    E-Print Network [OSTI]

    Bierlaire, Michel

    Pedestrian flow characterization based on spatio- temporal Voronoi tessellations Marija Nikoli Conference Monte Verità / Ascona, April 15 ­ 17, 2015 #12;Pedestrian flow characterization based on spatio-temporal Voronoi tessellations Transport and Mobility Laboratory, EPFL Pedestrian flow characterization based

  4. Temporal Geochemical Variations In Volatile Emissions From Mount...

    Open Energy Info (EERE)

    Temporal Geochemical Variations In Volatile Emissions From Mount St Helens, Usa, 1980-1994 Jump to: navigation, search OpenEI Reference LibraryAdd to library Journal Article:...

  5. Spatio-Temporal Optical Flow Statistics (STOFS) for Activity Classification

    E-Print Network [OSTI]

    California at Santa Barbara, University of

    al's 30-pixel man [5], and Roth and Black's idea [9] of learning optical flow statis- tics to learn flow statis- tics of activities. Specifically, this work concerns itself with learning Spatio-Temporal Optical Flow histogram Statis- tics(STOFS). It should be clarified that some recent work on optical flow

  6. Temporal and spatial variation of particulate matter and chlorophyll in the Arabian Sea 

    E-Print Network [OSTI]

    Gundersen, Jan Scott

    1997-01-01

    of the 1995 U.S. Joint Global Ocean Flux Study. Temporal and spatial variations of particulate matter (PM) and chlorophyll were determined via transrnissometers and fluorometers during a monsoonal cycle. Seasonal variations of the standing stock of PM...

  7. Spatial and temporal variations of the Kuroshio east of Taiwan, 19822005: A numerical study

    E-Print Network [OSTI]

    Wu, Chau-Ron

    Spatial and temporal variations of the Kuroshio east of Taiwan, 1982­2005: A numerical study Yi the spatial and temporal variations of the Kuroshio east of Taiwan. Between 22 and 25°N, the mean state of Taiwan and the branching of the Kuroshio northeast of Taiwan, are well reproduced by the model. Southeast

  8. Stress magnitude and its temporal variation at Mt. Asama Volcano, Japan, from seismic anisotropy and GPS

    E-Print Network [OSTI]

    Utrecht, Universiteit

    Stress magnitude and its temporal variation at Mt. Asama Volcano, Japan, from seismic anisotropy stress Japan The Earth's stress regime is fundamental to its physical processes, yet few methods can determine absolute stress, and measurements of temporal variations in stress are controversial. The Global

  9. Study of temporal variation of radon concentrations in public drinking water supplies

    SciTech Connect (OSTI)

    York, E.L. [Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Environmental Sciences and Engineering

    1995-12-31

    The Environmental Protection Agency (EPA) has proposed a Maximum Contaminant Level (MCL) for radon-222 in public drinking water supplies of 300 pCi/L. Proposed monitoring requirements include collecting quarterly grab samples for the first year, then annual samples for the remainder of the compliance cycle provided first year quarterly samples average below the MCL. The focus of this research was to study the temporal variation of groundwater radon concentrations to investigate how reliably one can predict an annual average radon concentration based on the results of grab samples. Using a {open_quotes}slow-flow{close_quotes} collection method and liquid scintillation analysis, biweekly water samples were taken from ten public water supply wells in North Carolina (6 month - 11 month sampling periods). Based on study results, temporal variations exist in groundwater radon concentrations. Statistical analysis performed on the data indicates that grab samples taken from each of the ten wells during the study period would exhibit groundwater radon concentrations within 30% of their average radon concentration.

  10. The spatio-temporal spectrum of turbulent flows

    E-Print Network [OSTI]

    di Leoni, P Clark; Mininni, P D

    2015-01-01

    Identification and extraction of vortical structures and of waves in a disorganized flow is a mayor challegen in the study of turbulence. We present a study of the spatio-temporal behavior of turbulent flows in the presence of different restitutive forces. We show how to compute and analyze the spatio-temporal spectrum from data stemming from numerical simulations and from laboratory experiments. Four cases are considered: homogeneous and isotropic turbulence, rotating turbulence, stratified turbulence, and water wave turbulence. For homogeneous and isotropic turbulence, the spectrum allows identification of random sweeping. For rotating and for stratified turbulence, the spectrum allows identification of the waves, quantification of the energy in the waves and in the turbulent eddies, and identification of physical mechanisms such as Doppler shift and wave absorption in critical layers. Finally, in water wave turbulence the spectrum shows a transition from gravity-capillary waves to bound waves as the amplit...

  11. Microfluidics: Kinetics of Hybridized DNA With Fluid Flow Variations...

    Office of Scientific and Technical Information (OSTI)

    Conference: Microfluidics: Kinetics of Hybridized DNA With Fluid Flow Variations. Citation Details In-Document Search Title: Microfluidics: Kinetics of Hybridized DNA With Fluid...

  12. An integrated experimental and numerical study: Developing a reaction transport model that couples chemical reactions of mineral dissolution/precipitation with spatial and temporal flow variations in CO2/brine/rock systems

    Broader source: Energy.gov [DOE]

    Project objectives: Generate and characterize mineral dissolution/precipitation reactions in supercritical CO2/brine/rock systems under pressure-temperature-chemistry conditions resembling CO2injection into EGS. Characterize three-dimensional spatial and temporal distributions of rock structures subject to mineral dissolution/precipitation processes by X-ray tomography, SEM imaging, and Microprobe analysis.

  13. Temporal Variation in Space and Resource Use of Macaws in the Southeastern Peruvian Amazon 

    E-Print Network [OSTI]

    Adamek, Krista Anne

    2012-07-16

    data on macaws in a region with relatively intact rainforest. Specific objectives were to (1) quantify space use, describe the spatial and temporal variation in movement patterns, explore habitat selection and spatial pattern of resources during the non...

  14. Supplementary Information for Methanol as a sensitive probe for spatial and temporal variations of the

    E-Print Network [OSTI]

    Supplementary Information for Methanol as a sensitive probe for spatial and temporal variations.757 0.68(5) Table I. Methanol (12 CH16 3 OH) maser transitions and accurate rest frequencies taken from

  15. Gradual Variation Analysis for Groundwater Flow

    E-Print Network [OSTI]

    Chen, Li

    2010-01-01

    Groundwater flow in Washington DC greatly influences the surface water quality in urban areas. The current methods of flow estimation, based on Darcy's Law and the groundwater flow equation, can be described by the diffusion equation (the transient flow) and the Laplace equation (the steady-state flow). The Laplace equation is a simplification of the diffusion equation under the condition that the aquifer has a recharging boundary. The practical way of calculation is to use numerical methods to solve these equations. The most popular system is called MODFLOW, which was developed by USGS. MODFLOW is based on the finite-difference method in rectangular Cartesian coordinates. MODFLOW can be viewed as a "quasi 3D" simulation since it only deals with the vertical average (no z-direction derivative). Flow calculations between the 2D horizontal layers use the concept of leakage. In this project, we have established a mathematical model based on gradually varied functions for groundwater data volume reconstruction. T...

  16. Application of a single step temporal imaging of magnetic induction tomography for metal flow visualization

    E-Print Network [OSTI]

    Adler, Andy

    and sensing coils. MIT has potential in visualization of metal flow for continuous casting mainly because of spatio-temporal resolution using the real metal flow in continuous casting. Results are comparedApplication of a single step temporal imaging of magnetic induction tomography for metal flow

  17. Spatial and temporal resolution of fluid flows: LDRD final report

    SciTech Connect (OSTI)

    Tieszen, S.R.; O`Hern, T.J.; Schefer, R.W.; Perea, L.D.

    1998-02-01

    This report describes a Laboratory Directed Research and Development (LDRD) activity to develop a diagnostic technique for simultaneous temporal and spatial resolution of fluid flows. The goal is to obtain two orders of magnitude resolution in two spatial dimensions and time simultaneously. The approach used in this study is to scale up Particle Image Velocimetry (PIV) and Planar Laser Induced Fluorescence (PLIF) to acquire meter-size images at up to 200 frames/sec. Experiments were conducted in buoyant, fully turbulent, non-reacting and reacting plumes with a base diameter of one meter. The PIV results were successful in the ambient gas for all flows, and in the plume for non-reacting helium and reacting methane, but not reacting hydrogen. No PIV was obtained in the hot combustion product region as the seed particles chosen vaporized. Weak signals prevented PLIF in the helium. However, in reacting methane flows, PLIF images speculated to be from Poly-Aromatic-Hydrocarbons were obtained which mark the flame sheets. The results were unexpected and very insightful. A natural fluorescence from the seed particle vapor was also noted in the hydrogen tests.

  18. Spatio-temporal variations of double-couple aftershock mechanisms and possible volumetric earthquake strain

    E-Print Network [OSTI]

    Ben-Zion, Yehuda

    Spatio-temporal variations of double-couple aftershock mechanisms and possible volumetric of the early focal mechanisms around the edges of the Landers rupture suggest possible volumetric earthquake volumetric earthquake strain, J. Geophys. Res. Solid Earth, 118, 2347­2355, doi:10.1002/jgrb.50202. 1

  19. Temporal integration of focus position signal during compensation for pursuit in optic flow

    E-Print Network [OSTI]

    Krekelberg, Bart

    Temporal integration of focus position signal during compensation for pursuit in optic flow Center in optic flow that specifies heading. Concurrent smooth pursuit causes distortion of the retinal flow on optic flow perception has received little attention. Here we separated the effects of velocity and gaze

  20. Relativistic Hydrodynamic Flows Using Spatial and Temporal Adaptive Structured Mesh Refinement

    E-Print Network [OSTI]

    Peng Wang; Tom Abel; Weiqun Zhang

    2007-12-31

    Astrophysical relativistic flow problems require high resolution three-dimensional numerical simulations. In this paper, we describe a new parallel three-dimensional code for simulations of special relativistic hydrodynamics (SRHD) using both spatially and temporally structured adaptive mesh refinement (AMR). We used the method of lines to discretize the SRHD equations spatially and a total variation diminishing (TVD) Runge-Kutta scheme for time integration. For spatial reconstruction, we have implemented piecewise linear method (PLM), piecewise parabolic method (PPM), third order convex essentially non-oscillatory (CENO) and third and fifth order weighted essentially non-oscillatory (WENO) schemes. Flux is computed using either direct flux reconstruction or approximate Riemann solvers including HLL, modified Marquina flux, local Lax-Friedrichs flux formulas and HLLC. The AMR part of the code is built on top of the cosmological Eulerian AMR code {\\sl enzo}. We discuss the coupling of the AMR framework with the relativistic solvers. Via various test problems, we emphasize the importance of resolution studies in relativistic flow simulations because extremely high resolution is required especially when shear flows are present in the problem. We also present the results of two 3d simulations of astrophysical jets: AGN jets and GRB jets. Resolution study of those two cases further highlights the need of high resolutions to calculate accurately relativistic flow problems.

  1. Temporal variations in space-time and progenitors of gamma ray burst and millisecond pulsars

    E-Print Network [OSTI]

    Preston Jones

    2007-08-31

    A time varying space-time metric is shown to be a source of electromagnetic radiation. The post-Newtonian approximation is used as a realistic model of the connection between the space-time metric and a time varying gravitational potential. Large temporal variations in the metric from the coalescence of colliding black holes and neutron stars are shown to be possible progenitors of gamma ray burst and millisecond pulsars.

  2. Multicomponent, multiphase flow in porous media with temperature variation

    SciTech Connect (OSTI)

    Wingard, J.S.; Orr, F.M. Jr.

    1990-10-01

    Recovery of hydrocarbons from porous media is an ongoing concern. Advanced techniques augment conventional recovery methods by injecting fluids that favorably interact with the oil. These fluids interact with the oil by energy transfer, in the case of steam injection, or by mass transfer, as in a miscible gas flood. Often both thermal and compositional considerations are important. An understanding of these injection methods requires knowledge of how temperature variations, phase equilibrium and multiphase flow in porous media interact. The material balance for each component and energy balance are cast as a system of non-strictly hyperbolic partial differential equations. This system of equations is solved using the method of characteristics. The model takes into account the phase behavior by using the Peng-Robinson equation of state to partition the individual components into different phases. Temperature effects are accounted for by the energy balance. Flow effects are modelled by using fractional flow curves and a Stone's three phase relative permeability model. Three problems are discussed. The first problem eliminates the phase behavior aspect of the problem by studying the flow of a single component as it undergoes an isothermal phase change. The second couples the effects of temperature and flow behavior by including a second component that is immiscible with the original component. Phase behavior is added by using a set of three partially miscible components that partition into two or three separate phases. 66 refs., 54 figs., 14 tabs.

  3. Methanol as a Sensitive Probe for Spatial and Temporal Variations of the Proton-to-Electron Mass Ratio

    E-Print Network [OSTI]

    Methanol as a Sensitive Probe for Spatial and Temporal Variations of the Proton-to-Electron Mass, corresponding to the 51 ! 60Aþ and 20 ! 3À1E transitions in methanol (CH3OH), respectively, are among transitions in the ground state of methanol to a variation of the proton-to- electron mass ratio. We show

  4. Some effects of small-scale metallicity variations in cooling flows

    E-Print Network [OSTI]

    R. Glenn Morris; A. C. Fabian

    2002-09-26

    In an attempt to reconcile recent spectral data with predictions of the standard cooling flow model, it has been suggested that the metals in the intracluster medium (ICM) might be distributed inhomogeneously on small scales. We investigate the possible consequences of such a situation within the framework of the cooling flow scenario. Using the standard isobaric cooling flow model, we study the ability of such metallicity variations to preferentially suppress low-temperature line emission in cooling flow spectra. We then use simple numerical simulations to investigate the temporal and spatial evolution of the ICM when the metals are distributed in such a fashion. Simulated observations are used to study the constraints real data can place on conditions in the ICM. The difficulty of ruling out abundance variations on small spatial scales with current observational limits is emphasized. We find that a bimodal distribution of metals may give rise to interesting effects in the observed abundance profile, in that apparent abundance gradients with central abundance drops and off-centre peaks, similar to those seen recently in some clusters, are produced. Different elements behave in different fashion as governed by the temperature dependence of their equivalent widths. Our overall conclusion is that, whilst this process alone seems unlikely to be able to account for the sharp reduction in low temperature emission lines seen in current spectral data, a contribution at some level is possible and difficult to rule out. The possibility of small-scale metallicity variations should be considered when analysing high resolution cluster X-ray spectra.

  5. Are non-magnetic mechanisms such as temporal solar diameter variations conceivable for an irradiance variability?

    E-Print Network [OSTI]

    J. P. Rozelot; S. Lefebvre; S. Pireaux; A. Ajabshirizadeh

    2006-01-05

    Irradiance variability has been monitored from space for more than two decades. Even if data are coming from different sources, it is well established that a temporal variability exists which can be set to as approximately 0.1%, in phase with the solar cycle. Today, one of the best explanation for such an irradiance variability is provided by the evolution of the solar surface magnetic fields. But if some 90 to 95% can be reproduced, what would be the origin of the 10 to 5% left? Non magnetic effects are conceivable. In this paper we will consider temporal variations of the diameter of the Sun as a possible contributor for the remaining part. Such an approach imposes strong constraints on the solar radius variability. We will show that over a solar cycle, variations of no more than 20 mas of amplitude can be considered. Such a variability (far from what is reported by observers conducting measurements by means of ground-based solar astrolabes) may explain a little part of the irradiance changes not explained by magnetic features. Further requirements are needed that may help to reach a conclusion. Dedicated space missions are necessary (for example PICARD, GOLF-NG or SDO, scheduled for a launch around 2008); it is also proposed to reactivate SDS flights for such a purpose.

  6. Simulations of Turbulent Flows with Strong Shocks and Density Variations

    SciTech Connect (OSTI)

    Zhong, Xiaolin

    2012-12-13

    In this report, we present the research efforts made by our group at UCLA in the SciDAC project ���¢��������Simulations of turbulent flows with strong shocks and density variations���¢�������. We use shock-fitting methodologies as an alternative to shock-capturing schemes for the problems where a well defined shock is present. In past five years, we have focused on development of high-order shock-fitting Navier-Stokes solvers for perfect gas flow and thermochemical non-equilibrium flow and simulation of shock-turbulence interaction physics for very strong shocks. Such simulation has not been possible before because the limitation of conventional shock capturing methods. The limitation of shock Mach number is removed by using our high-order shock-fitting scheme. With the help of DOE and TeraGrid/XSEDE super computing resources, we have obtained new results which show new trends of turbulence statistics behind the shock which were not known before. Moreover, we are also developing tools to consider multi-species non-equilibrium flows. The main results are in three areas: (1) development of high-order shock-fitting scheme for perfect gas flow, (2) Direct Numerical Simulation (DNS) of interaction of realistic turbulence with moderate to very strong shocks using super computing resources, and (3) development and implementation of models for computation of mutli-species non-quilibrium flows with shock-fitting codes.

  7. Estimating permeability from quasi-static deformation: Temporal variations and arrival time inversion

    SciTech Connect (OSTI)

    Vasco, D.W.; Ferretti, Alessandro; Novali, Fabrizio

    2008-05-01

    Transient pressure variations within a reservoir can be treated as a propagating front and analyzed using an asymptotic formulation. From this perspective one can define a pressure 'arrival time' and formulate solutions along trajectories, in the manner of ray theory. We combine this methodology and a technique for mapping overburden deformation into reservoir volume change as a means to estimate reservoir flow properties, such as permeability. Given the entire 'travel time' or phase field, obtained from the deformation data, we can construct the trajectories directly, there-by linearizing the inverse problem. A numerical study indicates that, using this approach, we can infer large-scale variations in flow properties. In an application to Interferometric Synthetic Aperture (InSAR) observations associated with a CO{sub 2} injection at the Krechba field, Algeria, we image pressure propagation to the northwest. An inversion for flow properties indicates a linear trend of high permeability. The high permeability correlates with a northwest trending fault on the flank of the anticline which defines the field.

  8. Temporal evolution characteristics of an annular-mode gliding arc discharge in a vortex flow

    SciTech Connect (OSTI)

    Zhao, Tian-Liang; Liu, Jing-Lin; Li, Xiao-Song; Liu, Jin-Bao; Song, Yuan-Hong; Xu, Yong; Zhu, Ai-Min

    2014-05-15

    An annular-mode gliding arc discharge powered by a 50?Hz alternating current (ac) supply was studied in a vortex flow of dry and humid air. Its temporal evolution characteristics were investigated by electrical measurement, temporally resolved imaging, and temporally resolved optical emission spectroscopic measurements. Three discharge stages of arc-ignition, arc-gliding, and arc-extinction were clearly observed in each half-cycle of the discharge. During the arc-gliding stage, the intensity of light emission from the arc root at the cathode was remarkably higher than that at other areas. The spectral intensity of N{sub 2}(C{sup 3}?{sub u}?B{sup 3}?{sub g}) during the arc-ignition stage was much higher than that during the arc-gliding stage, which was contrary to the temporal evolutions of spectral intensities for N{sub 2}{sup +}(B{sup 2}?{sub u}{sup +}?X{sup 2}?{sub g}{sup +}) and OH(A{sup 2}?{sup +}?X{sup 2}?{sub i}). Temporally resolved vibrational and rotational temperatures of N{sub 2} were also presented and decreased with increasing the water vapor content.

  9. Spatial and Temporal Variation in Stone Raw Material Provisioning in the Chivay Obsidian Source Area

    E-Print Network [OSTI]

    Tripcevich, Nicholas; MacKay, Alex

    2012-01-01

    Variations in Stone Raw Material Provisioning in the ChivayVariations in Stone Raw Material Provisioning in the Chivayof widely cir- culated raw materials provides an opportunity

  10. Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow

    E-Print Network [OSTI]

    Marchese, Francis

    Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow

  11. Temporal Entropy Generation in the Viscous Layers of Laterally-converging Duct Flows

    SciTech Connect (OSTI)

    Donald M. McEligot; Robert S. Brodkey; Helmut Eckelmann

    2008-12-01

    Since insight into entropy generation is a key to increasing efficiency and thereby reducing fuel consumption and/or waste and -- for wall-bounded flows -- most entropy is generated in the viscous layer, we examine the transient behavior of its dominant contributor there for a non-canonical flow. New measurements in oil flow are presented for the effects of favorable streamwise mean pressure gradients on temporal entropy generation rates and, in the process, on key Reynolds-stress-producing events such as sweep front passage and on the deceleration/outflow phase of the overall bursting process. Two extremes have been considered: (1) a high pressure gradient, nearing "laminarization," and (2), for comparison, a low pressure gradient corresponding to many earlier experiments. In both cases, the peak temporal entropy generation rate occurs shortly after passage of the ejection/sweep interface. Whether sweep and ejection rates appear to decrease or increase with the pressure gradient depends on the feature examined and the manner of sampling. When compared using wall coordinates for velocities, distances and time, the trends and magnitudes of the transient behaviors are mostly the same. The main effects of the higher pressure gradient are (1) changes in the time lag between detections -- representing modification of the shape of the sweep front and the sweep angle with the wall, (2) modification of the magnitude of an instantaneous Reynolds shear stress with wall distance and (3) enlarging the sweeps and ejections. Results new for both low and high pressure gradients are the temporal behaviors of the dominant contribution to entropy generation; it is found to be much more sensitive to distance from the wall than to streamwise pressure gradient.

  12. An analysis of spatial and temporal variation in fecal indicator concentrations in Singapore

    E-Print Network [OSTI]

    Shin, Suejung

    2012-01-01

    This study used extensive measurements of indicator concentrations to describe spatial and temporal patterns of four fecal indicators: E. coli, enterococci, total coliform, and human factor. Twenty twelve-hour time series ...

  13. Temporal and spatial variation in methyl bromide emissions from a salt marsh 

    E-Print Network [OSTI]

    Drewer, Julia; Heal, Mathew R; Heal, Kate V; Smith, Keith A

    2006-01-01

    Methyl bromide (CH3Br) is a trace gas involved in stratospheric ozone depletion with both anthropogenic and natural sources. Estimates of natural source strengths are highly uncertain. In this study, >320 highly temporally ...

  14. Variational principle for linear stability of flowing plasmas in Hall magnetohydrodynamics

    SciTech Connect (OSTI)

    Hirota, M.; Yoshida, Z.; Hameiri, E.

    2006-02-15

    Linear stability of equilibrium states with flow is studied by means of the variational principle in Hall magnetohydrodynamics (MHD). The Lagrangian representation of the linearized Hall MHD equation is performed by considering special perturbations that preserves some constants of motion (the Casimir invariants). The resultant equation has a Hamiltonian structure which enables the variational principle. There is however some difficulties in showing the positive definiteness of the quadratic form in the presence of flow. The dynamically accessible variation is a more restricted class of perturbations which, by definition, preserves all the Casimir invariants. For such variations, the quadratic form (the second variation of Hamiltonian) can be positive definite. Some conditions for stability are derived by applying this variational principle to the double Beltrami equilibrium.

  15. Effects of meridional flow variations on solar cycles 23 and 24

    SciTech Connect (OSTI)

    Upton, Lisa; Hathaway, David H. E-mail: lar0009@uah.edu

    2014-09-10

    The faster meridional flow that preceded the solar cycle 23/24 minimum is thought to have led to weaker polar field strengths, producing the extended solar minimum and the unusually weak cycle 24. To determine the impact of meridional flow variations on the sunspot cycle, we have simulated the Sun's surface magnetic field evolution with our newly developed surface flux transport model. We investigate three different cases: a constant average meridional flow, the observed time-varying meridional flow, and a time-varying meridional flow in which the observed variations from the average have been doubled. Comparison of these simulations shows that the variations in the meridional flow over cycle 23 have a significant impact (?20%) on the polar fields. However, the variations produced polar fields that were stronger than they would have been otherwise. We propose that the primary cause of the extended cycle 23/24 minimum and weak cycle 24 was the weakness of cycle 23 itself—with fewer sunspots, there was insufficient flux to build a big cycle. We also find that any polar counter-cells in the meridional flow (equatorward flow at high latitudes) produce flux concentrations at mid-to-high latitudes that are not consistent with observations.

  16. Blood Pressure and Blood Flow Variation during Postural Change from Sitting to Standing: Model

    E-Print Network [OSTI]

    1 Blood Pressure and Blood Flow Variation during Postural Change from Sitting to Standing: Model- tural change from sitting to standing involve complex interactions between the autonomic nervous system cerebral artery blood flow velocity during postural change from sitting to standing. Our cardiovascular

  17. Temporal and spatial variation in age-specific survival rates of a long-lived mammal,

    E-Print Network [OSTI]

    Aberdeen, University of

    for endangered Hawaiian monk seals (Monachus schauinslandi ) based on capture­recapture analyses of more than 85: Hawaiian monk seal; life history; survival; senescence; spatial variability; temporal variability 1 represent larger-scale patterns across the species range. The Hawaiian monk seal (Monachus schauinslandi

  18. Climate-linked mechanisms driving spatial and temporal variation in eelgrass (Zostera marina L.) growth and assemblage structure in Pacific Northwest estuaries, USA

    SciTech Connect (OSTI)

    Thom, Ronald M.; Southard, Susan L.; Borde, Amy B.

    2014-11-01

    Using laboratory experiments on temperature and leaf metabolism, and field data sets from Washington, between 1991 and 2013, we developed lines of evidence showing that variations in water temperature, mean sea level, and desiccation stress appear to drive spatial and temporal variations in eelgrass (Zostera marina).

  19. Supplementary Material Cover Sheet1 Temporal Variations of Organic Composition in the Tropical and Marine Atmosphere

    E-Print Network [OSTI]

    Meskhidze, Nicholas

    Supplementary Material Cover Sheet1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Temporal@nus.edu.sg Submitted to: Number of tables: 1 S1 #12;1. Background on forest and peat fires in Indonesia21 22 23 24 conditions of 1997-98 and 2006, thousands of fires raged in the peat swamps of Indonesia. Fires in peat

  20. Methanol as a Sensitive Probe for Spatial and Temporal Variations of the Proton-to-Electron Mass Ratio

    SciTech Connect (OSTI)

    Jansen, Paul; Ubachs, Wim; Bethlem, Hendrick L. [Institute for Lasers, Life and Biophotonics, VU University Amsterdam, De Boelelaan 1081, 1081 HV Amsterdam (Netherlands); Xu Lihong [Department of Physics and Centre for Laser, Atomic, and Molecular Sciences, University of New Brunswick, Saint John, New Brunswick E2L 4L5 (Canada); Kleiner, Isabelle [Laboratoire Interuniversitaire des Systemes Atmospheriques (LISA), CNRS UMR 7583 et Universites Paris 7 et Paris Est, 61 avenue du General de Gaulle, 94010 Creteil Cedex (France)

    2011-03-11

    The 6.7 and 12.2 GHz masers, corresponding to the 5{sub 1}{yields}6{sub 0}A{sup +} and 2{sub 0}{yields}3{sub -1}E transitions in methanol (CH{sub 3}OH), respectively, are among the brightest radio objects in the sky. We present calculations for the sensitivity of these and other transitions in the ground state of methanol to a variation of the proton-to-electron mass ratio. We show that the sensitivity is greatly enhanced due to a cancellation of energies associated with the hindered internal rotation and the overall rotation of the molecule. We find sensitivities of K{sub {mu}=}-42 and K{sub {mu}=}-33, for the 5{sub 1}{yields}6{sub 0}A{sup +} and 2{sub 0}{yields}3{sub -1}E transitions, respectively. The sensitivities of other transitions in the different isotopologues of methanol range from -88 to 330. This makes methanol a sensitive probe for spatial and temporal variations of the proton-to-electron mass ratio.

  1. Detection of embedded radiation sources using temporal variation of gamma spectral data.

    SciTech Connect (OSTI)

    Shokair, Isaac R.

    2011-09-01

    Conventional full spectrum gamma spectroscopic analysis has the objective of quantitative identification of all the isotopes present in a measurement. For low energy resolution detectors, when photopeaks alone are not sufficient for complete isotopic identification, such analysis requires template spectra for all the isotopes present in the measurement. When many isotopes are present it is difficult to make the correct identification and this process often requires many trial solutions by highly skilled spectroscopists. This report investigates the potential of a new analysis method which uses spatial/temporal information from multiple low energy resolution measurements to test the hypothesis of the presence of a target spectrum of interest in these measurements without the need to identify all the other isotopes present. This method is referred to as targeted principal component analysis (TPCA). For radiation portal monitor applications, multiple measurements of gamma spectra are taken at equally spaced time increments as a vehicle passes through the portal and the TPCA method is directly applicable to this type of measurement. In this report we describe the method and investigate its application to the problem of detection of a radioactive localized source that is embedded in a distributed source in the presence of an ambient background. Examples using simulated spectral measurements indicate that this method works very well and has the potential for automated analysis for RPM applications. This method is also expected to work well for isotopic detection in the presence of spectrally and spatially varying backgrounds as a result of vehicle-induced background suppression. Further work is needed to include effects of shielding, to understand detection limits, setting of thresholds, and to estimate false positive probability.

  2. THE SOLAR WIND AS A POSSIBLE SOURCE OF FAST TEMPORAL VARIATIONS OF THE HELIOSPHERIC RIBBON

    SciTech Connect (OSTI)

    Kucharek, H.; Lee, M. A.; Moebius, E.; Schwadron, N.; Fuselier, S. A.; McComas, D.; Wurz, P.; Pogorelov, N.; Borovikov, S.; Reisenfeld, D.; Funsten, H.

    2013-10-20

    We present a possible source of pickup ions (PUIs) the ribbon observed by the Interstellar Boundary EXplorer (IBEX). We suggest that a gyrating solar wind and PUIs in the ramp and in the near downstream region of the termination shock (TS) could provide a significant source of energetic neutral atoms (ENAs) in the ribbon. A fraction of the solar wind and PUIs are reflected and energized during the first contact with the TS. Some of the solar wind may be reflected propagating toward the Sun but most of the solar wind ions form a gyrating beam-like distribution that persists until it is fully thermalized further downstream. Depending on the strength of the shock, these gyrating distributions can exist for many gyration periods until they are scattered/thermalized due to wave-particle interactions at the TS and downstream in the heliosheath. During this time, ENAs can be produced by charge exchange of interstellar neutral atoms with the gyrating ions. In order to determine the flux of energetic ions, we estimate the solar wind flux at the TS using pressure estimates inferred from in situ measurements. Assuming an average path length in the radial direction of the order of a few AU before the distribution of gyrating ions is thermalized, one can explain a significant fraction of the intensity of ENAs in the ribbon observed by IBEX. With a localized source and such a short integration path, this model would also allow fast time variations of the ENA flux.

  3. Measurements of radon concentration in geothermal fluids at Cerro Prieto are evaluated with respect to spatial and temporal variations in reservoir thermodynamic conditions and

    E-Print Network [OSTI]

    Semprini, Lewis

    significantly suggesting an increase in the steam saturation in this part of the reservoir due to exploitation to spatial and temporal variations in reservoir thermodynamic conditions and the rock -- fluid mass ratio be attributed to the higher steam fraction in the reservoir fluid. Regression analysis of radon concentration

  4. HYDRODYNAMIC AND RADIATIVE MODELING OF TEMPORAL H{alpha} EMISSION V/R VARIATIONS CAUSED BY DISCONTINUOUS MASS TRANSFER IN BINARIES

    SciTech Connect (OSTI)

    Chadima, Pavel; Harmanec, Petr; Wolf, Marek; Firt, Roman; Ruzdjak, Domagoj; Bozic, Hrvoje; Koubsky, Pavel

    2011-07-15

    H{alpha} emission V/R variations caused by discontinuous mass transfer in interacting binaries with a rapidly rotating accreting star are modeled qualitatively for the first time. The program ZEUS-MP was used to create a non-linear three-dimensional hydrodynamical model of a development of a blob of gaseous material injected into an orbit around a star. It resulted in the formation of an elongated disk with a slow prograde revolution. The LTE radiative transfer program SHELLSPEC was used to calculate the H{alpha} profiles originating in the disk for several phases of its revolution. The profiles have the form of a double emission and exhibit V/R and radial velocity variations. However, these variations should be a temporal phenomenon since imposing a viscosity in the given model would lead to a circularization of the disk and fading-out of the given variations.

  5. Spatial and temporal variation of polynuclear aromatic hydrocarbons, pesticides, and polychlorinated biphenyls in Crassostrea virginica and sediments from Galveston Bay, Texas 

    E-Print Network [OSTI]

    Fox, Richard George

    1988-01-01

    , such as pesticides and polychlorinated biphenyls (PCBs), enter coastal environments from riverine discharge, coastal sewage effluents, industrial wastes, runoff, and as aerosols (NAS, 1979 and Rapaport et al. , 1985). Polynuclear aromatic hydrocarbons (PAHs...SPATIAL AND TEMPORAL VARIATION OF POLYNUCLEAR AROMATIC HYDROCARBONS, PESTICIDES, AND POLYCHLORINATED BIPHENYLS IN CRASSOSTREA VZRGINICA AND SEDIMENTS FROM GALVESTON BAY, TEXAS A Thesis by RICHARD GEORGE FOX Submitted to the Graduate College...

  6. An isogeometric variational multiscale method for large-eddy simulation of coupled multi-ion transport in turbulent flow

    SciTech Connect (OSTI)

    Bauer, Georg; Gamnitzer, Peter [Institute for Computational Mechanics, Technische Universität München, Boltzmannstr. 15, 85747 Garching (Germany)] [Institute for Computational Mechanics, Technische Universität München, Boltzmannstr. 15, 85747 Garching (Germany); Gravemeier, Volker, E-mail: vgravem@lnm.mw.tum.de [Institute for Computational Mechanics, Technische Universität München, Boltzmannstr. 15, 85747 Garching (Germany) [Institute for Computational Mechanics, Technische Universität München, Boltzmannstr. 15, 85747 Garching (Germany); Emmy Noether Research Group “Computational Multiscale Methods for Turbulent Combustion”, Technische Universität München, Boltzmannstr. 15, 85747 Garching (Germany); Wall, Wolfgang A. [Institute for Computational Mechanics, Technische Universität München, Boltzmannstr. 15, 85747 Garching (Germany)] [Institute for Computational Mechanics, Technische Universität München, Boltzmannstr. 15, 85747 Garching (Germany)

    2013-10-15

    Highlights: •We present a computational method for coupled multi-ion transport in turbulent flow. •The underlying formulation is a variational multiscale finite element method. •It is combined with the isogeometric concept for electrochemical systems. •Coupled multi-ion transport in fully turbulent Taylor–Couette flow is simulated. •This example is an important model problem for rotating cylinder electrodes. -- Abstract: Electrochemical processes, such as electroplating of large items in galvanic baths, are often coupled to turbulent flow. In this study, we propose an isogeometric residual-based variational multiscale finite element method for multi-ion transport in dilute electrolyte solutions under turbulent flow conditions. In other words, this means that the concepts of isogeometric discretization and variational multiscale methods are successfully combined for developing a method capable of simulating the challenging problem of coupled multi-ion transport in turbulent flow. We present a comprehensive three-dimensional computational method taking into account, among others, coupled convection–diffusion-migration equations subject to an electroneutrality constraint in combination with phenomenological electrode-kinetics modeling. The electrochemical subproblem is one-way coupled to turbulent incompressible flow via convection. Ionic mass transfer in turbulent Taylor–Couette flow is investigated, representing an important model problem for rotating-cylinder-electrode configurations. Multi-ion transport as considered here is an example for mass transport at high Schmidt number (Sc=1389). An isogeometric discretization is especially advantageous for the present problem, since (i) curved boundaries can be represented exactly, and (ii) it has been proven to provide very accurate solutions for flow quantities when being applied in combination with residual-based variational multiscale modeling. We demonstrate that the method is robust and provides results which are in good agreement with direct numerical simulation results as well as empirical mass-transfer correlations reported in literature.

  7. Soil respiration and microbial biomass in a savanna parkland landscape: spatio-temporal variation and environmental controls 

    E-Print Network [OSTI]

    McCulley, Rebecca Lynne

    1998-01-01

    ) in this region. The objective of this study was to quantify variation in soil respiration, soil microbial biomass (SMB), and potential C and N mineralization rates in relation to landscape heterogeneity and woody plant encroachment in this region. In addition...

  8. Spatial and temporal variations in indoor environmental conditions, human occupancy, and operational characteristics in a new hospital building

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Ramos, Tiffanie; Dedesko, Sandra; Siegel, Jeffrey A.; Gilbert, Jack A.; Stephens, Brent

    2015-03-02

    The dynamics of indoor environmental conditions, human occupancy, and operational characteristics of buildings influence human comfort and indoor environmental quality, including the survival and progression of microbial communities. A suite of continuous, long-term environmental and operational parameters were measured in ten patient rooms and two nurse stations in a new hospital building in Chicago, IL to characterize the indoor environment in which microbial samples were taken for the Hospital Microbiome Project. Measurements included environmental conditions (indoor dry-bulb temperature, relative humidity, humidity ratio, and illuminance) in the patient rooms and nurse stations; differential pressure between the patient rooms and hallways; surrogatemore »measures for human occupancy and activity in the patient rooms using both indoor air CO? concentrations and infrared doorway beam-break counters; and outdoor air fractions in the heating, ventilating, and air-conditioning systems serving the sampled spaces. Measurements were made at 5-minute intervals over consecutive days for nearly one year, providing a total of ~8×10? data points. Indoor temperature, illuminance, and human occupancy/activity were all weakly correlated between rooms, while relative humidity, humidity ratio, and outdoor air fractions showed strong temporal (seasonal) patterns and strong spatial correlations between rooms. Differential pressure measurements confirmed that all patient rooms were operated at neutral pressure. The patient rooms averaged about 100 combined entrances and exits per day, which suggests they were relatively lightly occupied compared to higher traffic environments (e.g., retail buildings) and more similar to lower traffic office environments. There were also clear differences in several environmental parameters before and after the hospital was occupied with patients and staff. Characterizing and understanding factors that influence these building dynamics is vital for hospital environments, where they can impact patient health and the survival and spread of healthcare associated infections.« less

  9. Carbonaceous aerosols recorded in a southeastern Tibetan glacier: analysis of temporal variations and model estimates of sources and radiative forcing

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Wang, Mo; Xu, B.; Cao, J.; Tie, X.; Wang, Hailong; Zhang, Rudong; Qian, Yun; Rasch, Philip J.; Zhao, Shuyu; Wu, Guangjian; et al

    2015-02-02

    High temporal resolution measurements of black carbon (BC) and organic carbon (OC) covering the time period of 1956–2006 in an ice core over the southeastern Tibetan Plateau show a distinct seasonal dependence of BC and OC with higher respective concentrations but a lower OC / BC ratio in the non-monsoon season than during the summer monsoon. We use a global aerosol-climate model, in which BC emitted from different source regions can be explicitly tracked, to quantify BC source–receptor relationships between four Asian source regions and the southeastern Tibetan Plateau as a receptor. The model results show that South Asia hasmore »the largest contribution to the present-day (1996–2005) mean BC deposition at the ice-core drilling site during the non-monsoon season (October to May) (81%) and all year round (74%), followed by East Asia (14% to the non-monsoon mean and 21% to the annual mean). The ice-core record also indicates stable and relatively low BC and OC deposition fluxes from the late 1950s to 1980, followed by an overall increase to recent years. This trend is consistent with the BC and OC emission inventories and the fuel consumption of South Asia (as the primary contributor to annual mean BC deposition). Moreover, the increasing trend of the OC / BC ratio since the early 1990s indicates a growing contribution of coal combustion and/or biomass burning to the emissions. The estimated radiative forcing induced by BC and OC impurities in snow has increased since 1980, suggesting an increasing potential influence of carbonaceous aerosols on the Tibetan glacier melting and the availability of water resources in the surrounding regions. Our study indicates that more attention to OC is merited because of its non-negligible light absorption and the recent rapid increases evident in the ice-core record.« less

  10. Spatial and temporal variations in indoor environmental conditions, human occupancy, and operational characteristics in a new hospital building

    SciTech Connect (OSTI)

    Ramos, Tiffanie; Dedesko, Sandra; Siegel, Jeffrey A.; Gilbert, Jack A.; Stephens, Brent

    2015-03-02

    The dynamics of indoor environmental conditions, human occupancy, and operational characteristics of buildings influence human comfort and indoor environmental quality, including the survival and progression of microbial communities. A suite of continuous, long-term environmental and operational parameters were measured in ten patient rooms and two nurse stations in a new hospital building in Chicago, IL to characterize the indoor environment in which microbial samples were taken for the Hospital Microbiome Project. Measurements included environmental conditions (indoor dry-bulb temperature, relative humidity, humidity ratio, and illuminance) in the patient rooms and nurse stations; differential pressure between the patient rooms and hallways; surrogate measures for human occupancy and activity in the patient rooms using both indoor air CO? concentrations and infrared doorway beam-break counters; and outdoor air fractions in the heating, ventilating, and air-conditioning systems serving the sampled spaces. Measurements were made at 5-minute intervals over consecutive days for nearly one year, providing a total of ~8×10? data points. Indoor temperature, illuminance, and human occupancy/activity were all weakly correlated between rooms, while relative humidity, humidity ratio, and outdoor air fractions showed strong temporal (seasonal) patterns and strong spatial correlations between rooms. Differential pressure measurements confirmed that all patient rooms were operated at neutral pressure. The patient rooms averaged about 100 combined entrances and exits per day, which suggests they were relatively lightly occupied compared to higher traffic environments (e.g., retail buildings) and more similar to lower traffic office environments. There were also clear differences in several environmental parameters before and after the hospital was occupied with patients and staff. Characterizing and understanding factors that influence these building dynamics is vital for hospital environments, where they can impact patient health and the survival and spread of healthcare associated infections.

  11. Carbonaceous aerosols recorded in a southeastern Tibetan glacier: analysis of temporal variations and model estimates of sources and radiative forcing

    SciTech Connect (OSTI)

    Wang, Mo; Xu, B.; Cao, J.; Tie, X.; Wang, Hailong; Zhang, Rudong; Qian, Yun; Rasch, Philip J.; Zhao, Shuyu; Wu, Guangjian; Zhao, Huabiao; Joswiak, Daniel R.; Li, Jiule; Xie, Ying

    2015-01-01

    High temporal resolution measurements of black carbon (BC) and organic carbon (OC) covering the time period of 1956–2006 in an ice core over the southeastern Tibetan Plateau show a distinct seasonal dependence of BC and OC with higher respective concentrations but a lower OC / BC ratio in the non-monsoon season than during the summer monsoon. We use a global aerosol-climate model, in which BC emitted from different source regions can be explicitly tracked, to quantify BC source–receptor relationships between four Asian source regions and the southeastern Tibetan Plateau as a receptor. The model results show that South Asia has the largest contribution to the present-day (1996–2005) mean BC deposition at the ice-core drilling site during the non-monsoon season (October to May) (81%) and all year round (74%), followed by East Asia (14% to the non-monsoon mean and 21% to the annual mean). The ice-core record also indicates stable and relatively low BC and OC deposition fluxes from the late 1950s to 1980, followed by an overall increase to recent years. This trend is consistent with the BC and OC emission inventories and the fuel consumption of South Asia (as the primary contributor to annual mean BC deposition). Moreover, the increasing trend of the OC / BC ratio since the early 1990s indicates a growing contribution of coal combustion and/or biomass burning to the emissions. The estimated radiative forcing induced by BC and OC impurities in snow has increased since 1980, suggesting an increasing potential influence of carbonaceous aerosols on the Tibetan glacier melting and the availability of water resources in the surrounding regions. Our study indicates that more attention to OC is merited because of its non-negligible light absorption and the recent rapid increases evident in the ice-core record.

  12. GPR Surveys across a Prototype Surface Barrier to Determine Temporal and Spatial Variations in Soil Moisture Content

    SciTech Connect (OSTI)

    Clement, William P.; Ward, Anderson L.

    2008-06-10

    Engineered surface barriers are expected to play a critical role in the closure of waste sites within the DOE complex and currently require monitoring to verify performance. The most comprehensive approach to assess performance is by water balance evaluation, which requires knowledge of the soil water storage. However, water storage measurements are still made mostly by point sensors and as result field-scale estimates are subject to much uncertainty. The objective of this study was to assess the viability of using ground penetrating radar (GPR) to monitor changes in soil moisture distribution, and therefore water storage, at multiple scales. Profiles were collected at four times during the year March, May, September and the following January to track the decrease in storage from the spring to the summer followed by the increase in the winter. A series of 40-m long profiles were collected using 100-Mhz antennas with a sample interval of 0.8 ns and 500 samples per trace in a 400-ns window. A common midpoint (CMP) survey was first used to determine an optimal antenna separation (3.5 m) after which data were collected using a wide-offset reflection geometry. Travel times were used to calculate the electromagnetic velocities which were then used to calculate water content using the Topp’s equation. Changes in the GPR response were easily observed over the course of the study and indicated spatial differences in moisture, which owing to the relatively uniform soil, can be attributed to differences in water removal by evapotranspiration. Water content also showed a strong seasonal strong seasonal dependence that correlate well with seasonal changes in precipitation and plant water uptake. An investigation of the effects of soil water content on the amplitude of the ground wave showed weaker amplitudes in the drier spring and summer months than in the winter suggesting a correlation between amplitude and water content. Results show that GPR can provide accurate non-invasive estimates of spatial and temporal changes in water content and therefore soil water storage.

  13. Controls on spatial variations in flow resistance along steep mountain streams

    E-Print Network [OSTI]

    Bledsoe, Brian

    . Reachaverage velocities were measured at varying discharges with dye tracers and fluorometers. Multiple is hydraulic radius, D84 is the 84th percentile of the cumulative grain size distribution, and R2 is equal variables with flow period (a categorical variable) or dimensionless unit discharge (q*). Total resistance

  14. JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 96, NO; C10,PAGES 18,491-18,507,OCTOBER 15, 1991 Mean Flow and Variability in the Kuroshio Extension

    E-Print Network [OSTI]

    Qiu, Bo

    Exact RepeatMission(ERM), weinvestigatedthe mean flow and temporal and spatial variations of the Kuroshio the absolutesurfaceheight fieldsfor the first 2.5 yearsof the Geosat ERM. Both the mean and the instantaneous height fields

  15. Simulations of Turbulent Flows with Strong Shocks and Density Variations: Final Report

    SciTech Connect (OSTI)

    Sanjiva Lele

    2012-10-01

    The target of this SciDAC Science Application was to develop a new capability based on high-order and high-resolution schemes to simulate shock-turbulence interactions and multi-material mixing in planar and spherical geometries, and to study Rayleigh-Taylor and Richtmyer-Meshkov turbulent mixing. These fundamental problems have direct application in high-speed engineering flows, such as inertial confinement fusion (ICF) capsule implosions and scramjet combustion, and also in the natural occurrence of supernovae explosions. Another component of this project was the development of subgrid-scale (SGS) models for large-eddy simulations of flows involving shock-turbulence interaction and multi-material mixing, that were to be validated with the DNS databases generated during the program. The numerical codes developed are designed for massively-parallel computer architectures, ensuring good scaling performance. Their algorithms were validated by means of a sequence of benchmark problems. The original multi-stage plan for this five-year project included the following milestones: 1) refinement of numerical algorithms for application to the shock-turbulence interaction problem and multi-material mixing (years 1-2); 2) direct numerical simulations (DNS) of canonical shock-turbulence interaction (years 2-3), targeted at improving our understanding of the physics behind the combined two phenomena and also at guiding the development of SGS models; 3) large-eddy simulations (LES) of shock-turbulence interaction (years 3-5), improving SGS models based on the DNS obtained in the previous phase; 4) DNS of planar/spherical RM multi-material mixing (years 3-5), also with the two-fold objective of gaining insight into the relevant physics of this instability and aiding in devising new modeling strategies for multi-material mixing; 5) LES of planar/spherical RM mixing (years 4-5), integrating the improved SGS and multi-material models developed in stages 3 and 5. This final report is outlined as follows. Section 2 shows an assessment of numerical algorithms that are best suited for the numerical simulation of compressible flows involving turbulence and shock phenomena. Sections 3 and 4 deal with the canonical shock-turbulence interaction problem, from the DNS and LES perspectives, respectively. Section 5 considers the shock-turbulence inter-action in spherical geometry, in particular, the interaction of a converging shock with isotropic turbulence as well as the problem of the blast wave. Section 6 describes the study of shock-accelerated mixing through planar and spherical Richtmyer-Meshkov mixing as well as the shock-curtain interaction problem In section 7 we acknowledge the different interactions between Stanford and other institutions participating in this SciDAC project, as well as several external collaborations made possible through it. Section 8 presents a list of publications and presentations that have been generated during the course of this SciDAC project. Finally, section 9 concludes this report with the list of personnel at Stanford University funded by this SciDAC project.

  16. GEOPHYSICS, VOL. 64, NO. 4 (JULY-AUGUST, 1999); P. 11811192, 10 FIGS., 1 TABLE. Azimuthal variation in P-wave signatures due to fluid flow

    E-Print Network [OSTI]

    Edinburgh, University of

    the overburden using vertical seismic profiles (VSPs) (Horne and MacBeth, 1997) and in the labora- Published for attenuation in the upper crust at seismic frequencies is intracrack fluid flow. In cracked media period of the workshop on Azimuthal Variations in Seismic Signature (held in conjunction with the 1997

  17. Spatial and temporal scales of force and torque acting on wall-mounted spherical particles in open channel flow

    E-Print Network [OSTI]

    Chan-Braun, Clemens; Uhlmann, Markus

    2013-01-01

    Data from direct numerical simulation of open channel flow over a geometrically rough wall at a bulk Reynolds number of 2900, generated by Chan-Braun et al. ["Force and torque acting on particles in a transitionally rough open-channel flow", J. Fluid Mech. 684, 441--474 (2011), 10.1017/jfm.2011.311] are further analysed with respect to the time and length scales of force and torque acting on the wall-mounted spheres. For the two sizes of spheres in a square arrangement (11 and 49 wall units in diameter, yielding hydraulically smooth and transitionally rough flow, respectively), the spatial structure of drag, lift and spanwise torque is investigated. The auto-correlation and spectra in time as well as the space-time correlation and convection velocities are presented and discussed. It is found that the statistics of spanwise particle torque are similar to those of shear stress at a smooth wall. Particle drag and lift are shown to differ from spanwise particle torque, exhibiting considerably smaller time and le...

  18. Temporal implicatures

    E-Print Network [OSTI]

    Thomas, Guillaume (Guillaume Pierre Yves)

    2012-01-01

    This dissertation proposes a theory of temporal implicatures, and applies it to the study of tense in Mbyá Guaraní. It is composed of two parts. In the first one, I discuss the analyses of temporal implicatures developed ...

  19. A locally conservative variational multiscale method for the simulation of porous media flow with multiscale source terms

    E-Print Network [OSTI]

    Dub, Francois-Xavier

    2008-01-01

    Multiscale phenomena are ubiquitous to flow and transport in porous media. They manifest themselves through at least the following three facets: (1) effective parameters in the governing equations are scale dependent; (2) ...

  20. Bi-Annual Report 2010-2011: Shaping pulse flows to meet environmental and energy objectives

    SciTech Connect (OSTI)

    Jager, Yetta [ORNL

    2010-10-01

    This report describes a bioenergetic model developed to allocate seasonal pulse flows to benefit salmon growth. The model links flow with floodplain inundation and production of invertebrate prey eaten by juvenile Chinook salmon. A unique quantile modeling approach is used to describe temporal variation among juvenile salmon spawned at different times. Preliminary model outputs are presented and future plans to optimize flows both to maximize salmon growth and hydropower production are outlined.

  1. Source Characterization and Temporal Variation of Methane Seepage from Thermokarst Lakes on the Alaska North Slope in Response to Arctic Climate Change

    SciTech Connect (OSTI)

    2012-09-30

    The goals of this research were to characterize the source, magnitude and temporal variability of methane seepage from thermokarst lakes (TKL) within the Alaska North Slope gas hydrate province, assess the vulnerability of these areas to ongoing and future arctic climate change and determine if gas hydrate dissociation resulting from permafrost melting is contributing to the current lake emissions. Analyses were focused on four main lake locations referred to in this report: Lake Qalluuraq (referred to as Lake Q) and Lake Teshekpuk (both on Alaska?s North Slope) and Lake Killarney and Goldstream Bill Lake (both in Alaska?s interior). From analyses of gases coming from lakes in Alaska, we showed that ecological seeps are common in Alaska and they account for a larger source of atmospheric methane today than geologic subcap seeps. Emissions from the geologic source could increase with potential implications for climate warming feedbacks. Our analyses of TKL sites showing gas ebullition were complemented with geophysical surveys, providing important insight about the distribution of shallow gas in the sediments and the lake bottom manifestation of seepage (e.g., pockmarks). In Lake Q, Chirp data were limited in their capacity to image deeper sediments and did not capture the thaw bulb. The failure to capture the thaw bulb at Lake Q may in part be related to the fact that the present day lake is a remnant of an older, larger, and now-partially drained lake. These suggestions are consistent with our analyses of a dated core of sediment from the lake that shows that a wetland has been present at the site of Lake Q since approximately 12,000 thousand years ago. Chemical analyses of the core indicate that the availability of methane at the site has changed during the past and is correlated with past environmental changes (i.e. temperature and hydrology) in the Arctic. Discovery of methane seeps in Lake Teshekpuk in the northernmost part of the lake during 2009 reconnaissance surveys provided a strong impetus to visit this area in 2010. The seismic methods applied in Lake Teshekpuk were able to image pockmarks, widespread shallow gas in the sediments, and the relationship among different sediment packages on the lake?s bottom, but even boomer seismics did not detect permafrost beneath the northern part of the lake. By characterizing the biogeochemistry of shallow TKL with methane seeps we showed that the radical seasonal shifts in ice cover and temperature. These seasonal environmental differences result in distinct consumption and production processes of biologically-relevant compounds. The combined effects of temperature, ice-volume and other lithological factors linked to seepage from the lake are manifest in the distribution of sedimentary methane in Lake Q during icecovered and ice-free conditions. The biogeochemistry results illustrated very active methanotrophy in TKLs. Substantial effort was subsequently made to characterize the nature of methanotrophic communities in TKLs. We applied stable isotope probing approaches to genetically characterize the methanotrophs most active in utilizing methane in TKLs. Our study is the first to identify methane oxidizing organisms active in arctic TKLs, and revealing that type I methanotrophs and type II methanotrophs are abundant and active in assimilating methane in TKLs. These organisms play an important role in limiting the flux of methane from these sites. Our investigations indicate that as temperatures increase in the Arctic, oxidation rates and active methanotrophic populations will also shift. Whether these changes can offset predicted increases in methanogenesis is an important question underlying models of future methane flux and resultant climate change. Overall our findings indicate that TKLs and their ability to act as both source and sink of methane are exceedingly sensitive to environmental change.

  2. Deformation bands and their impact on fluid flow in sandstone reservoirs: the role of natural thickness variations

    E-Print Network [OSTI]

    Fossen, Haakon

    Deformation bands and their impact on fluid flow in sandstone reservoirs: the role of natural Cataclastic deformation bands, which are common in sandstone reservoirs and which may negatively affect fluid simulation of an array of cataclastic deformation bands in Cretaceous sandstones in in the Bassin de Sud

  3. Temporal variations in temperature over Northeastern Africa 

    E-Print Network [OSTI]

    Peterson, Robby Douglas

    1994-01-01

    unavailable data from Northeastern Africa from 1900 to 1950, the data are analyzed to determine whether thermal patterns are identifiable in maximum and minimum temperatures over smaller scales in the tropics and sub-tropics. First, the Alexandersson Test...

  4. Variational Principles for Water Waves

    E-Print Network [OSTI]

    Boris Kolev; David H. Sattinger

    2007-12-01

    We describe the Hamiltonian structures, including the Poisson brackets and Hamiltonians, for free boundary problems for incompressible fluid flows with vorticity. The Hamiltonian structure is used to obtain variational principles for stationary gravity waves both for irrotational flows as well as flows with vorticity.

  5. Anomalous diffusion in bounded temporally irregular flows

    E-Print Network [OSTI]

    Venkataramani, Shankar C.

    Department of Physics, Department of Electrical Engineering and Institute for Plasma Research, University

  6. Doing time : inducing temporal graphs

    E-Print Network [OSTI]

    Bramsen, Philip James

    2006-01-01

    We consider the problem of constructing a directed acyclic graph that encodes temporal relations found in a text. The unit of our analysis is a temporal segment, a fragment of text that maintains temporal coherence. The ...

  7. The role of magnetic islands in modifying long range temporal correlations of density fluctuations and local heat transport

    E-Print Network [OSTI]

    van Milligen, B Ph; Garcia, L; Bruna, D Lopez; Carreras, B A; Xu, Y; Ochando, M; Hidalgo, C; Reynolds-Barredo, J M; Fraguas, A Lopez

    2015-01-01

    This work explores the relation between magnetic islands, long range temporal correlations and heat transport. A low order rational surface ($\\iota/2\\pi = 3/2$) was purposely scanned outward through an Electron Cyclotron Resonance Heated (ECRH) plasma in the TJ-II stellarator. Density turbulence and the poloidal flow velocity (or radial electric field) were characterized using a two channel Doppler Reflectometer. Simultaneously, the ECRH power was modulated to characterize heat transport, using measurements from a 12 channel Electron Cyclotron Emission diagnostic. A systematic variation of the poloidal velocity was found to be associated with the stationary $\\iota/2\\pi = 3/2$ magnetic island. Inside from the rational surface, the Hurst coefficient, quantifying the nature of long-range correlations, was found to be significantly enhanced. Simultaneously, heat transport was enhanced as well, establishing a clear link between density fluctuations and anomalous heat transport. The variation of the Hurst coefficie...

  8. Temporal Aggregates and Temporal Universal Quantification in Standard SQL

    E-Print Network [OSTI]

    Libre de Bruxelles, Université

    Temporal Aggregates and Temporal Universal Quantification in Standard SQL Esteban Zim´anyi Dept that querying and updating time-varying information using stan- dard (i.e., non-temporal) SQL is a challenging task, the pro- posed temporal extensions of SQL have not reach accep- tance in the standardization

  9. Spatial and temporal variations in indoor environmental conditions...

    Office of Scientific and Technical Information (OSTI)

    beam-break counters; and outdoor air fractions in the heating, ventilating, and air-conditioning systems serving the sampled spaces. Measurements were made at 5-minute intervals...

  10. TEMPORAL VARIATIONS OF FRACTURE DIRECTIONS AND FRACTURE DENSITIES...

    Open Energy Info (EERE)

    DIRECTIONS AND FRACTURE DENSITIES IN THE COSO GEOTHERMAL FIELD FROM ANALYSES OF SHEAR-WAVE SPLITTING Jump to: navigation, search OpenEI Reference LibraryAdd to library Conference...

  11. Temporal Variation in Fish Communities off Santa Cruz Island, California

    E-Print Network [OSTI]

    Graves, Michelle R.; Larson, Ralph J.; Alevizon, William S.

    2006-01-01

    effects, understanding natural change in marine populations is critical for management of marine resources.

  12. Peer Reviewed Temporal Variation in Stable Carbon and Nitrogen

    E-Print Network [OSTI]

    Gillingham, Michael

    Columbia, Prince George, BC V2N 4Z9, Canada DOUGLAS C. HEARD,1 British Columbia Ministry of Environment, Prince George, BC V2N 1B3, Canada MICHAEL P. GILLINGHAM, Natural Resources and Environmental Studies, University of Northern British Columbia, Prince George, BC V2N 4Z9, Canada Abstract Animal diet

  13. Temporal Geochemical Variations In Volatile Emissions From Mount St Helens,

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page| Open Energy Information Serbia-EnhancingEt Al., 2013) | Opensource History View NewsourceUsa, 1980-1994 | Open Energy

  14. TEMPORAL VARIATIONS OF FRACTURE DIRECTIONS AND FRACTURE DENSITIES IN THE

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTION JEnvironmental Jump to:EA EIS ReportEuropeEnergySustainabilitySynapsenseSyracuse,TDK

  15. Temporal Velocity Variations beneath the Coso Geothermal Field Observed

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTION JEnvironmental Jump to:EA EISTJ Automation JumpSet RenewableFuelStandard Jump to:using Seismic

  16. Temporal Search Web Archives

    E-Print Network [OSTI]

    Waldmann, Uwe

    Temporal Search in Web Archives Dissertation zur Erlangung des Grades Doktor der 10.02.2010 (Klaus Lorenz Berberich) #12;vi #12;Abstract Web archives include both archives of contents originally published on the Web (e.g., the Internet Archive) but also archives of contents

  17. Macrosegregation Macrosegregation refers to variations in composition

    E-Print Network [OSTI]

    Beckermann, Christoph

    in casting processes: (i) Flow that feeds the solidification shrinkage and the contractions of the liquidMacrosegregation Macrosegregation refers to variations in composition that occur in alloy castings variations have a detrimental impact on the subsequent processing behavior and properties of cast materials

  18. Temporal Evolution of Free Magnetic Energy Associated with Four X-class Flares

    E-Print Network [OSTI]

    energy for much of the solar activity such as flares and coronal mass ejections (CMEs)(see, for review magnetic configuration for conversion into kinetic and/or thermal energy) and its temporal variationTemporal Evolution of Free Magnetic Energy Associated with Four X-class Flares Ju Jing1 , P. F

  19. The deep hydrogeologic flow system underlying the Oak Ridge Reservation -- Assessing the potential for active groundwater flow and origin of the brine

    SciTech Connect (OSTI)

    Nativ, R.; Halleran, A.; Hunley, A.

    1997-08-01

    The deep hydrogeologic system underlying the Oak Ridge Reservation (ORR) contains contaminants such as radionuclides, heavy metals, nitrates, and organic compounds. The groundwater in the deep system is saline and has been considered to be stagnant in previous studies. This study was designed to address the following questions: is groundwater in the deep system stagnant; is contaminant migration controlled by diffusion only or is advection a viable mechanism; where are the potential outlet points? On the basis of existing and newly collected data, the nature of saline groundwater flow and potential discharge into shallow, freshwater systems was assessed. Data used for this purpose included (1) spatial and temporal pressures and hydraulic heads measured in the deep system, (2) hydraulic parameters of the formations in question, (3) spatial and temporal temperature variations at depth, and (4) spatial and temporal chemical and isotopic composition of the saline groundwater. The observations suggest that the saline water contained at depth is old but not isolated (in terms of recharge and discharge) from the overlying active, freshwater-bearing units. Influx of recent water does occur. Groundwater volumes involved in this flow are likely to be small. The origin of the saline groundwater was assessed by using existing and newly acquired chemical and isotopic data. The proposed model that best fits the data is modification of residual brine from which halite has been precipitated. Other models, such as ultrafiltration and halite dissolution, were also evaluated.

  20. The deep hydrogeologic flow system underlying the Oak Ridge Reservation

    SciTech Connect (OSTI)

    Nativ, R.; Hunley, A.E.

    1993-07-01

    The deep hydrogeologic system underlying the Oak Ridge Reservation contains some areas contaminated with radionuclides, heavy metals, nitrates, and organic compounds. The groundwater at that depth is saline and has previously been considered stagnant. On the basis of existing and newly collected data, the nature of flow of the saline groundwater and its potential discharge into shallow, freshwater systems was assessed. Data used for this purpose included (1) spatial and temporal pressures and hydraulic heads measured in the deep system, (2) hydraulic parameters of the formations in question, (3) spatial temperature variations, and (4) spatial and temporal chemical and isotopic composition of the saline groundwater. In addition, chemical analyses of brine in adjacent areas in Tennessee, Kentucky, Ohio, Pennsylvania, and West Virginia were compared with the deep water underlying the reservation to help assess the origin of the brine. Preliminary conclusions suggest that the saline water contained at depth is old but not isolated (in terms of recharge and discharge) from the overlying active and freshwater-bearing units. The confined water (along with dissolved solutes) moves along open fractures (or man-made shortcuts) at relatively high velocity into adjacent, more permeable units. Groundwater volumes involved in this flow probably are small.

  1. Temporal Representation in Semantic Graphs

    SciTech Connect (OSTI)

    Levandoski, J J; Abdulla, G M

    2007-08-07

    A wide range of knowledge discovery and analysis applications, ranging from business to biological, make use of semantic graphs when modeling relationships and concepts. Most of the semantic graphs used in these applications are assumed to be static pieces of information, meaning temporal evolution of concepts and relationships are not taken into account. Guided by the need for more advanced semantic graph queries involving temporal concepts, this paper surveys the existing work involving temporal representations in semantic graphs.

  2. Models in Temporal Knowledge Representation and Temporal DBMS (90-8)

    E-Print Network [OSTI]

    Barrera, Renato; Al-Taha, Khaled K; NCGIA Maine Orono

    1990-01-01

    V. and P. D. e. al. "Designing DBMS Support for the TemporalRepresentation and Temporal DBMS. department of Surveyingof temporal reasoning and DBMS's in the literature. , ASDS

  3. Variational Information Theory

    E-Print Network [OSTI]

    Penny, Will

    Variational Inference Will Penny Information Theory Information Entropy Kullback-Liebler Divergence Summary References Variational Inference Will Penny Bayesian Inference Course, WTCN, UCL, March 2013 #12;Variational Inference Will Penny Information Theory Information Entropy Kullback-Liebler Divergence Gaussians

  4. Variational Methods for Computational Fluid Dynamics Annee 2013 -2014.

    E-Print Network [OSTI]

    Alouges, François

    are only valid for laminar flow at low Reynolds number. 4. Compute the flow rate F (the quantity of fluid that a fluid is flowing (from left to right) obeying Navier-Syokes equation. 1. Show that there is a stationary1 Variational Methods for Computational Fluid Dynamics Ann´ee 2013 - 2014. X2011. PC 1 Exercise 1

  5. Anisotropic flow

    E-Print Network [OSTI]

    S. A. Voloshin

    2002-11-20

    Recent experimental results on directed and elliptic flow, theoretical developments, and new techniques for anisotropic flow analysis are reviewed.

  6. Quantifying Cell-to-Cell Variation in Power-Law Rheology

    E-Print Network [OSTI]

    Cai, PingGen

    Among individual cells of the same source and type, the complex shear modulus G[subscript ?] exhibits a large log-normal distribution that is the result of spatial, temporal, and intrinsic variations. Such large distributions ...

  7. VARIATIONS IN THE HELIOSPHERIC POLAR ENERGETIC NEUTRAL ATOM FLUX OBSERVED BY THE INTERSTELLAR BOUNDARY EXPLORER

    E-Print Network [OSTI]

    Reisenfeld, D. B.

    The ecliptic poles are observed continuously by the Interstellar Boundary Explorer (IBEX); thus, it is possible to discern temporal variations in the energetic neutral atoms (ENAs) from the outer heliosphere on timescales ...

  8. 784 IEEE TRANSACTIONS ON PLASMA SCIENCE, VOL. 18. NO. 5, OCTOBER 1990 Temporal Evolution of Plasma From a Highly Ionized

    E-Print Network [OSTI]

    Rocca, Jorge J.

    -3 transitions of HeII has been observed following plasma recombination in a flowing arc jet [9]. However the low784 IEEE TRANSACTIONS ON PLASMA SCIENCE, VOL. 18. NO. 5, OCTOBER 1990 Temporal Evolution of Plasma the temporal ev- olution of a highly ionized helium plasma generated in a l-mm-diameter capillary by a fast (90

  9. Genome size variation of Gossypium hirsutum 

    E-Print Network [OSTI]

    Gomez, Martha I.

    1993-01-01

    . Flow cytometric determinations of DNA were performed in 32 races of the tetraploid cotton, Gossypium hirsutum L. About 19% variation in mean DNA content was found among the races of cotton analyzed. The range of mean DNA content was from 2C=5.08 pg...

  10. Observations and simulations of synoptic, regional, and local variations in atmospheric CO2

    E-Print Network [OSTI]

    Collett Jr., Jeffrey L.

    Observations and simulations of synoptic, regional, and local variations in atmospheric CO2 Jih] Synoptic events may play an important role in determining the CO2 spatial distribution and temporal 2001, which had the most significant CO2 concentration variation in our case pool. The CO2

  11. Seasonal variations in the equatorial thermospheric wind measured at Arequipa, Peru

    SciTech Connect (OSTI)

    Biondi, M.A.; Merriwether, J.W.; Fejer, B.G.; Gonzalez, S.A.

    1990-08-01

    Studies have been carried out Arequipa, Peru, of the seasonal variations in the thermospheric winds at moderate solar flux levels and geomagnetic activity. Fabry-Perot interferometer measurements of the doppler shifts in the 630.0 nm nightglow emission line from March to August 1983 and from April to October 1988 have yielded monthly-average meridional winds that are nearly zero (<50 m/s) and possible fluctuating in direction through much of the night but develop a southward flow at 50 - 100 m/s in the early and the late night from May onward. The average zonal winds are eastward throughout the night, reaching peak velocities before local midnight and then decreasing. The peak velocities increase to a maximum around the June solstice. The winds are generally stronger in 1988 than in 1983, even thought the solar EUV fluxes are comparable fro both years. Comparison of the present results with earlier satellite measurements, as embodied in the Horizontal Wind Model of Hedin et al., reveals generally satisfactory agreement at the equinox and June solstice, except for the June 1988 period. NCAR Therospheric General Circulation Model, calculated for similar solar flux levels, yields meridional and zonal wind variations which exhibit the same temporal behaviors but generally smaller values than the present measurements.

  12. Neutrino flux variations and solar activity

    E-Print Network [OSTI]

    Ikhsanov, R N

    2003-01-01

    We investigate temporal variations of the solar neutrino flux in 1970-1997. The periods of 11, 5 and 2 years have been found in the variations of the neutrino flux. The results indicate that a periodicity close to 5 years is the most significant in the data from both the Homestake and GALLEX experiments. Two groups of the solar activity indices have been distinguished regarding their interconnection with the neutrino flux series. The first group contains the indices showing predominantly 11-year period, while a periodicity at approximately 5 years is observed in the second group. The correlation coefficients between the neutrino flux and indices from the first group are negative, with their module not exceeding 0.5. The second group is characterized by positive correlation with the neutrino counting rates with coefficients not lower than 0.6. A discussion of findings is presented.

  13. Point-to-Point Car Racing: an Initial Study of Evolution Versus Temporal Difference Learning

    E-Print Network [OSTI]

    Togelius, Julian

    Point-to-Point Car Racing: an Initial Study of Evolution Versus Temporal Difference Learning Simon, jtogel}@essex.ac.uk Abstract-- This paper considers variations on an extremely simple form of car racing-evaluation neural networks, and these were greatly superior to human drivers. Keywords: Car racing, reinforcement

  14. Active Temporal Multiplexing of Photons

    E-Print Network [OSTI]

    Gabriel J. Mendoza; Raffaele Santagati; Jack Munns; Elizabeth Hemsley; Mateusz Piekarek; Enrique Martin-Lopez; Graham D. Marshall; Damien Bonneau; Mark G. Thompson; Jeremy L. O'Brien

    2015-08-12

    Photonic qubits constitute a leading platform to disruptive quantum technologies due to their unique low-noise properties. The cost of the photonic approach is the non-deterministic nature of many of the processes, including single-photon generation, which arises from parametric sources and negligible interaction between photons. Active temporal multiplexing - repeating a generation process in time and rerouting to single modes using an optical switching network - is a promising approach to overcome this challenge and will likely be essential for large-scale applications with greatly reduced resource complexity and system sizes. Requirements include the precise synchronization of a system of low-loss switches, delay lines, fast photon detectors, and feed-forward. Here we demonstrate temporal multiplexing of 8 'bins' from a double-passed heralded photon source and observe an increase in the heralding and heralded photon rates. This system points the way to harnessing temporal multiplexing in quantum technologies, from single-photon sources to large-scale computation.

  15. Active Temporal Multiplexing of Photons

    E-Print Network [OSTI]

    Gabriel J. Mendoza; Raffaele Santagati; Jack Munns; Elizabeth Hemsley; Mateusz Piekarek; Enrique Martin-Lopez; Graham D. Marshall; Damien Bonneau; Mark G. Thompson; Jeremy L. O'Brien

    2015-03-04

    Quantum information science promises powerful new technologies and fundamental scientific discoveries. Photonic qubits are appealing for their low noise properties-the cost is the non-deterministic nature of many processes, including photon generation and entanglement. Active multiplexing can increase the success probability of such processes above a required threshold, and spatial multiplexing of up to four heralded photon sources shows great promise. The cost is a proliferation of hardware. Temporal multiplexing-repeated use of the same hardware components-has been proposed as an alternative and is likely to be essential to greatly reduce resource complexity and system sizes. Requirements include the precise synchronization of a system of low-loss switches, delay lines, fast photon detectors, and feed-forward. Here we demonstrate multiplexing of 8 'bins'-four temporal and two spatial-from a heralded photon source. We show enhanced photon emission statistics, observing an increase in both the triggering and heralded photon rates. Despite its current limitations due to extrinsic sources of loss, this system points the way to harnessing temporal multiplexing in quantum technologies, from single-photon sources to large-scale computation.

  16. Self-regulating flow control device

    DOE Patents [OSTI]

    Humphreys, Duane A. (Pittsburgh, PA)

    1984-01-01

    A variable, self-regulating valve having a hydraulic loss coefficient proportional to a positive exponential power of the flow rate. The device includes two objects in a flow channel and structure which assures that the distance between the two objects is an increasing function of the flow rate. The range of spacing between the objects is such that the hydraulic resistance of the valve is an increasing function of the distance between the two objects so that the desired hydraulic loss coefficient as a function of flow rate is obtained without variation in the flow area.

  17. A Microfluidic Device for Temporally Controlled Gene Expression and Long-Term Fluorescent Imaging in

    E-Print Network [OSTI]

    Siggia, Eric

    A Microfluidic Device for Temporally Controlled Gene Expression and Long-Term Fluorescent Imaging of the cell cycle. Over the past ten years, microfluidic techniques in cell biology have emerged that allow a microfluidic flow cell to grow Saccharomyces Cerevisiae for more than 8 generations (

  18. Flow chamber

    DOE Patents [OSTI]

    Morozov, Victor (Manassas, VA)

    2011-01-18

    A flow chamber having a vacuum chamber and a specimen chamber. The specimen chamber may have an opening through which a fluid may be introduced and an opening through which the fluid may exit. The vacuum chamber may have an opening through which contents of the vacuum chamber may be evacuated. A portion of the flow chamber may be flexible, and a vacuum may be used to hold the components of the flow chamber together.

  19. Geological flows

    E-Print Network [OSTI]

    Yu. N. Bratkov

    2008-11-19

    In this paper geology and planetology are considered using new conceptual basis of high-speed flow dynamics. Recent photo technics allow to see all details of a flow, 'cause the flow is static during very short time interval. On the other hand, maps and images of many planets are accessible. Identity of geological flows and high-speed gas dynamics is demonstrated. There is another time scale, and no more. All results, as far as the concept, are new and belong to the author. No formulae, pictures only.

  20. Flow regimes

    SciTech Connect (OSTI)

    Liles, D.R.

    1982-01-01

    Internal boundaries in multiphase flow greatly complicate fluid-dynamic and heat-transfer descriptions. Different flow regimes or topological configurations can have radically dissimilar interfacial and wall mass, momentum, and energy exchanges. To model the flow dynamics properly requires estimates of these rates. In this paper the common flow regimes for gas-liquid systems are defined and the techniques used to estimate the extent of a particular regime are described. Also, the current computer-code procedures are delineated and introduce a potentially better method is introduced.

  1. An interesting temporalization of Gödel's ontological proof

    E-Print Network [OSTI]

    Gavriel Segre

    2009-04-24

    Recent theologies concerning God's death after Auschwitz are mathematically formalized through a suitable temporalization of G\\"{o}del's Ontological Proof.

  2. Harmonic generation with temporally focused ultrashort pulses

    E-Print Network [OSTI]

    Silberberg, Yaron

    Harmonic generation with temporally focused ultrashort pulses Dan Oron and Yaron Silberberg of harmonic generation with temporally focused ultrashort pulses are explored both theoreti- cally and experimentally. Analyzing the phase-matching conditions for harmonic generation we find a corre- spondence

  3. Handling Change Management using Temporal Active Repositories

    E-Print Network [OSTI]

    Gal, Avigdor

    Handling Change Management using Temporal Active Repositories Avigdor Gal and Opher Etzion and their management. In this paper we introduce an architecture of change man- agement using active temporal repositories. Flexible change management allows the support of information about past or future versions

  4. Hybrid Ockhamist Temporal Logic Patrick Blackburn

    E-Print Network [OSTI]

    Goranko, Valentin

    Hybrid Ockhamist Temporal Logic Patrick Blackburn INRIA, Lorraine Campus Scientifique, BP 239 Nancy Johannesburg, South Africa vfg@na.rau.ac.za Abstract We introduce hybrid Ockhamist temporal logic, which combines the mechanisms of hybrid logic with Ockhamist semantics by employing nominals, satisfaction

  5. MINING TEMPORAL SEQUENCES TO DISCOVER INTERESTING PATTERNS

    E-Print Network [OSTI]

    Holder, Lawrence B.

    MINING TEMPORAL SEQUENCES TO DISCOVER INTERESTING PATTERNS Edwin O. Heierman, III, G. Michael, Texas 76019-0015 {heierman, youngbld, cook@cse.uta.edu ABSTRACT When mining temporal sequences sequences. In this paper, we present a novel data mining technique based on the Minimum Description Length

  6. Temporal Multivariate Networks James Abello1

    E-Print Network [OSTI]

    Kobourov, Stephen G.

    Temporal Multivariate Networks James Abello1 , Daniel Archambault2 , Jessie Kennedy3 , Stephen. In a multivariate scenario, however, attributes play an important role and can also evolve over time. In this chapter, we characterize and survey methods for visualizing temporal multivariate networks. We also

  7. Variational transition state theory

    SciTech Connect (OSTI)

    Truhlar, D.G. [Univ. of Minnesota, Minneapolis (United States)

    1993-12-01

    This research program involves the development of variational transition state theory (VTST) and semiclassical tunneling methods for the calculation of gas-phase reaction rates and selected applications. The applications are selected for their fundamental interest and/or their relevance to combustion.

  8. Dynamic coupling of volcanic CO2 flow and wind at the HorseshoeLake tree kill, Mammoth Mountain, CA

    SciTech Connect (OSTI)

    Lewicki, J.L.; Hilley, G.E.; Tosha, T.; Aoyagi, R.; Yamamoto, K.; Benson, S.M.

    2006-11-20

    We investigate spatio-temporal relationships between soilCO2 flux (FCO2), meteorological variables, and topography over a ten-dayperiod (09/12/2006 to 09/21/2006) at the Horseshoe Lake tree kill,Mammoth Mountain, CA. Total CO2 discharge varied from 16 to 52 t d-1,suggesting a decline in CO2 emissions over decadal timescales. Weobserved systematic changes in FCO2 in space and time in association witha weather front with relatively high wind speeds from the west and lowatmospheric pressures. The largest FCO2 changes were observed inrelatively high elevation areas. The variations in FCO2 may be due todynamic coupling of wind-driven airflow through the subsurface and flowof source CO2 at depth. Our results highlight the influence of weatherfronts on volcanic gas flow in the near-surface environment and how thisinfluence can vary spatially within a study area.

  9. Understanding order flow

    E-Print Network [OSTI]

    Evans, MDD; Lyons, Richard K.

    2006-01-01

    consider, the proportion of the variation in excess returnsa signi…cant proportion of the variation in exchange ratesregressions; the proportion of excess return variation that

  10. Variational principle for optimal accelerated neutralized flow A. Fruchtman

    E-Print Network [OSTI]

    American Institute of Physics. DOI: 10.1063/1.1331567 I. INTRODUCTION Electric propulsion for space vehicles utilizes electric and magnetic fields to accelerate a propellant to a much higher velocity than chemical propulsion does, and, as a re- sult, the required propellant mass is reduced. Among electric

  11. Microfluidics: Kinetics of Hybridized DNA With Fluid Flow Variations.

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfate Reducing(JournalspectroscopyReport) |(Patent) |monitoring.(Patent) |method thereof

  12. High-resolution temporal record of Holocene ground-water chemistry: Tracing links between climate and hydrology

    E-Print Network [OSTI]

    Banner, Jay L.

    growth layers in Holocene spe- leothems from Barbados, West Indies, reveals high-resolution temporal. carbonate mineral reactions, as reflected in 87 Sr/86 Sr values of modern Barbados ground waters variations in rainfall on Barbados that are predicted by this hydrologic model. INTRODUCTION In spite

  13. DECORRELATION TIMES OF PHOTOSPHERIC FIELDS AND FLOWS

    SciTech Connect (OSTI)

    Welsch, B. T.; Kusano, K.; Yamamoto, T. T.; Muglach, K.

    2012-03-10

    We use autocorrelation to investigate evolution in flow fields inferred by applying Fourier local correlation tracking (FLCT) to a sequence of high-resolution (0.''3), high-cadence ({approx_equal} 2 minute) line-of-sight magnetograms of NOAA active region (AR) 10930 recorded by the narrowband filter imager of the Solar Optical Telescope aboard the Hinode satellite over 2006 December 12 and 13. To baseline the timescales of flow evolution, we also autocorrelated the magnetograms, at several spatial binnings, to characterize the lifetimes of active region magnetic structures versus spatial scale. Autocorrelation of flow maps can be used to optimize tracking parameters, to understand tracking algorithms' susceptibility to noise, and to estimate flow lifetimes. Tracking parameters varied include: time interval {Delta}t between magnetogram pairs tracked, spatial binning applied to the magnetograms, and windowing parameter {sigma} used in FLCT. Flow structures vary over a range of spatial and temporal scales (including unresolved scales), so tracked flows represent a local average of the flow over a particular range of space and time. We define flow lifetime to be the flow decorrelation time, {tau}. For {Delta}t > {tau}, tracking results represent the average velocity over one or more flow lifetimes. We analyze lifetimes of flow components, divergences, and curls as functions of magnetic field strength and spatial scale. We find a significant trend of increasing lifetimes of flow components, divergences, and curls with field strength, consistent with Lorentz forces partially governing flows in the active photosphere, as well as strong trends of increasing flow lifetime and decreasing magnitudes with increases in both spatial scale and {Delta}t.

  14. Variations on Remy's algorithm Nicolas Curien

    E-Print Network [OSTI]

    Borgs, Christian

    ... Variation 2 I heard about this variation from Luc Devroye (Barbados workshop, March 2011). We define

  15. STATIONARITY IN SOLAR WIND FLOWS

    SciTech Connect (OSTI)

    Perri, S.; Balogh, A. E-mail: a.balogh@imperial.ac.u

    2010-05-01

    By using single-point measurements in space physics it is possible to study a phenomenon only as a function of time. This means that we cannot have direct access to information about spatial variations of a measured quantity. However, the investigation of the properties of turbulence and of related phenomena in the solar wind widely makes use of an approximation frequently adopted in hydrodynamics under certain conditions, the so-called Taylor hypothesis; indeed, the solar wind flow has a bulk velocity along the radial direction which is much higher than the velocity of a single turbulent eddy embedded in the main flow. This implies that the time of evolution of the turbulent features is longer than the transit time of the flow through the spacecraft position, so that the turbulent field can be considered frozen into the solar wind flow. This assumption allows one to easily associate time variations with spatial variations and stationarity to homogeneity. We have investigated, applying criteria for weak stationarity to Ulysses magnetic field data in different solar wind regimes, at which timescale and under which conditions the hypothesis of stationarity, and then of homogeneity, of turbulence in the solar wind is well justified. We extend the conclusions of previous studies by Matthaeus and Goldstein to different parameter ranges in the solar wind. We conclude that the stationarity assumption in the inertial range of turbulence on timescales of 10 minutes to 1 day is reasonably satisfied in fast and uniform solar wind flows, but that in mixed, interacting fast, and slow solar wind streams the assumption is frequently only marginally valid.

  16. Flow cytometer

    DOE Patents [OSTI]

    Van den Engh, G.

    1995-11-07

    A Faraday cage is described which encloses the flow chamber of a cytometer. Ground planes associated with each field deflection plate inhibit electric fields from varying the charge on designated events/droplets and further concentrates. They also increase forces applied to a passing charged event for accurate focus while concomitantly inhibiting a potential shock hazard. 4 figs.

  17. The temporal efficiency of SO? emissions trading

    E-Print Network [OSTI]

    Ellerman, A. Denny

    2002-01-01

    This paper provides an empirical evaluation of the temporal efficiency of the U.S. Acid Rain Program, which implemented a nationwide market for trading and banking sulfur dioxide (SO2) emission allowances. We first develop ...

  18. TEMPORAL PATTERNS AND MODAL Johan van Benthem

    E-Print Network [OSTI]

    Amsterdam, University of

    temporal systems' is mixing the analysis of 'logical time' with standard physical engineering techniques process theories (dynamic logic, µ­calculus, process algebra), surveyed in Colin Stirling's contribution to this issue. (Cf. also Stirling 1

  19. A study of temporal visual composition

    E-Print Network [OSTI]

    Sun, Xiaohua, 1972-

    2007-01-01

    With the rapid growth of digital art, the temporal dimension is becoming a more and more important aspect of visual creations. This thesis is an effort to contribute to the construction of a disciplined basis for the ...

  20. CFD analysis of laminar oscillating flows

    SciTech Connect (OSTI)

    Booten, C. W. Charles W.); Konecni, S.; Smith, B. L.; Martin, R. A.

    2001-01-01

    This paper describes a numerical simulations of oscillating flow in a constricted duct and compares the results with experimental and theoretical data. The numerical simulations were performed using the computational fluid dynamics (CFD) code CFX4.2. The numerical model simulates an experimental oscillating flow facility that was designed to test the properties and characteristics of oscillating flow in tapered ducts, also known as jet pumps. Jet pumps are useful devices in thermoacoustic machinery because they produce a secondary pressure that can counteract an unwanted effect called streaming, and significantly enhance engine efficiency. The simulations revealed that CFX could accurately model velocity, shear stress and pressure variations in laminar oscillating flow. The numerical results were compared to experimental data and theoretical predictions with varying success. The least accurate numerical results were obtained when laminar flow approached transition to turbulent flow.

  1. Large scale structures in gas-liquid mixture flows

    SciTech Connect (OSTI)

    Davis, M.R.; Fungtamasan, B.

    1984-12-01

    Relatively slow variations in mixture void fraction in gas-liquid mixture flows are indicated by low pass filter averaging. The slow void fluctuations are found to have a regular characteristic frequency or scale in the churn flow regime or near the boundary with the dispersed bubble flow regime. These regular disturbances develop inherently in a vertical pipe flow in strength and in size and are not due to the method of flow mixing. There was no evidence of distinctive gas slugs in the flow, and the structures were identified as large clouds of bubbles which moved faster than the average velocity, growing in size and strength as they moved with the flow. The magnitude of the voidage fluctuations in the churn flow regime was on average 57% of the value for a slug flow. The large scale bubble clouds convect coherently over relatively long distances a up to 1.45 times the mean mixture flow velocity at a gas volume flow fraction of 0.4. In the bubbl flow regime, the slow voidage variations were more random in scale and were only approx. 10% of the slug flow (maximum possible) value. However, even in the bubble flow regime, the disturbances convected coherently over relatively long distances at a velocity of approx. 1.1 time the mean mixture velocity.

  2. Porosity, Permeability, And Fluid Flow In The Yellowstone Geothermal...

    Open Energy Info (EERE)

    section of the 0.6-Ma Lava Creek ash-flow tuff. In this core, the degree of welding appears to be responsible for most of the variations in porosity, matrix...

  3. Temporal Variations in the Effective Reproduction Number of the 2014 West Africa

    E-Print Network [OSTI]

    Leone, and Liberia up to September 8, 2014, and employ novel methodology to estimate how the rate to the outbreak data. Results We find that for Liberia and Guinea, the effective reproduction number rose, rather, Liberia, and Sierra Leone announced plans to impose a military- enforced mass quarantine of entire regions

  4. Estimating permeability from quasi-static deformation: Temporal variations and arrival time inversion

    E-Print Network [OSTI]

    Vasco, D.W.

    2008-01-01

    production and oil-related subsidence: in Tison, L. J. , (Ed. ), Land subsidence, 1 , Internat. Assoc. Sci. Hydrologyand Yen, T. F. , 1994, Subsidence due to ?uid withdrawal:

  5. Spatial and temporal variation in age and growth of king mackerel,

    E-Print Network [OSTI]

    . 1982. Fishery management plan, final environmental impact statement, regulatory impact re- view, final 1986 to 1992 from North Carolina to Yucatan, Mexico, and 2,033 collected in 1977 and 1978 from North-Atlantic Ocean. eastern Gulf of Mexico, and western Gulf-reflecting the currently recog- nized stocks. Maximum

  6. Spatial and temporal variations in trace metal concentrations in sediments and oysters from Galveston Bay, Texas 

    E-Print Network [OSTI]

    Jiann, Kuo-Tung

    1993-01-01

    along the adjacent coast, and 0. 06-0. 55 ppm outside the area (Takeuchi, 1972). Concentrations of 7-800 ppm of Cu, 5-500 ppm of Pb and 30-1200 ppm of Zn were found in southern California coast sediments (Katz and Kaplan, 1981). In the sediments from...H 7. 0, 1 M NaOAc at pH 5. 0 (adjusted by HOAc), 0. 3 M NazSz04+ 0. 175 M Na-citrate + 0. 025 M H-citrate, 0. 02 M HNOs and 30% HzOz at pH 2. 0 (adjusted with HNOs), 3. 2 M NH4OAc in 20% HNOs, and HF- HC104 mixture. Sequential extractions use...

  7. Patterns and Controls of Temporal Variation in CO2 Sequestration and Loss in Arctic Ecosystems

    SciTech Connect (OSTI)

    Oechel, Walter C.

    2002-03-21

    Determine seasonal and interannual patterns of net ecosystem CO2 flux from wet coastal and moist tussock tundra.

  8. Spatial and Temporal Variation in Stone Raw Material Provisioning in the Chivay Obsidian Source Area

    E-Print Network [OSTI]

    Tripcevich, Nicholas; MacKay, Alex

    2012-01-01

    Peru and its effects upon human use of the landscape. Quaternary International 2005 Preludes to power

  9. Individual, Sexual, Seasonal, and Temporal Variation in the Amount of Sagebrush Lizard Scent Marks

    E-Print Network [OSTI]

    Ord, Terry

    Behavior, Indiana University, Bloomington, IN 47405, USA J. Slaven I E. A. Housworth Department, Health Effects Laboratory Division, National Institute of Occupational Safety and Health, Centers graciosus . Behavior cycle . Reptilia . Iguania . Phrynosomatidae Introduction In many animals, the behavior

  10. Estimating permeability from quasi-static deformation: Temporal variations and arrival time inversion

    E-Print Network [OSTI]

    Vasco, D.W.

    2008-01-01

    uid saturation prediction in a multicomponent reservoir,saturation change. Furthermore, at the pressures within the Krechba reservoir

  11. Estimating permeability from quasi-static deformation: Temporal variations and arrival time inversion

    E-Print Network [OSTI]

    Vasco, D.W.

    2008-01-01

    Thermal Oper- ations and Heavy Oil Symposium, CHOA 97848,activity at the Cold Lake heavy oil ?eld, Alberta, Canada:

  12. Copeia,2000(2),pp. 587-592 Temporal Variation in Anuran Calling Behavior: Implications for

    E-Print Network [OSTI]

    Dorcas, Michael E.

    1997 at a Carolinabay on the U.S. Departmentof Energy'sSavannah River Site, South Carolina after sunset, and the entire route should be run, in- cluding travel time to and from the wetlands to develop models to optimize effectiveness of manual call surveys. We used ARS to quantify and evaluate tem

  13. Temporal variation overshadows the response of leaf litter microbial communities to simulated global change

    E-Print Network [OSTI]

    2015-01-01

    multi- ple experimental climate change drivers. Appl EnvironCEC (2003). Global Climate Change and California: Potential2008). The effects of climate change on plant phenology.

  14. "Method for Controlling of Spatial and Temporal Variations of Plasma

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home RoomPreservationBio-Inspired SolarAboutXuRod Hunt (208) 386-52542 120"Geek"Little

  15. Response of the bottom boundary layer over a sloping shelf to variations in alongshore wind

    E-Print Network [OSTI]

    to a great extent by flows in the surface and bottom boundary layers (BBL). Wind forcing generates crossResponse of the bottom boundary layer over a sloping shelf to variations in alongshore wind A boundary layer over a sloping shelf to variations in alongshore wind, J. Geophys. Res., 110, C10S09, doi:10

  16. Understanding order flow

    E-Print Network [OSTI]

    Evans, MDD; Lyons, Richard K.

    2006-01-01

    Understanding Order Flow October 2005 Martin D. D. Evans 1Rate Fundamentals and Order Flow, typescript, Georgetown2005), Customer Order Flow and Exchange Rate Movements: Is

  17. A Temporal Planning System for Time-Optimal Planning

    E-Print Network [OSTI]

    Garrido, Antonio

    the utility of our system for dealing with temporal planning problems. Key words: planning, temporal planningA Temporal Planning System for Time-Optimal Planning Antonio Garrido, Eva Onaindía and Federico with temporality on actions presents an important challenge to AI planning. Unlike Graphplan-based planners which

  18. Efficient Temporal Coalescing Query Support in Relational Database Systems

    E-Print Network [OSTI]

    Zaniolo, Carlo

    demand for temporal databases have only in- creased with time; unfortunately, DBMS vendors and standard by the lessons learned from the very history of temporal databases, where past proposals failed to gain much temporal query models with current DBMS engines [5]. Even if temporal database and query model can be well

  19. Environmental Flows in Water Availability Modeling 

    E-Print Network [OSTI]

    Wurbs, R.; Hoffpauir, R.

    2013-07-18

    Report No. 440 Texas Water Resources Institute The Texas A&M University System College Station, Texas 77843-2118 May 2013 TABLE OF CONTENTS Chapter 1 Introduction..., and alternative variations thereof. The Brazos WAM is large and complex, providing opportunities to explore a number of issues involved in integrating environmental flow, water supply, flood control, hydropower, multiple-reservoir system operations, and other...

  20. Groundwater flow to the coastal ocean Ann E. Mulligan and Matthew A. Charette

    E-Print Network [OSTI]

    of high hydraulic head to areas of low hydraulic head terrain, such as karst. In addition to typically low flow rates, groundwater discharge is temporally is driven by differences in energy ­ water flows from high energy areas to low energy. The energy content

  1. Model-Based Multi-view Fusion of Cinematic Flow and Optical Imaging

    E-Print Network [OSTI]

    Paragios, Nikos

    Model-Based Multi-view Fusion of Cinematic Flow and Optical Imaging Mickael Savinaud1,2,3 , Martin-view Fusion of Cinematic Flow and Optical Imaging 669 optical imaging devices are now able to image does not enable cinematic acquisition. The use of temporal information involves either animal tracking

  2. Automated Storage Reclamation Using Temporal Importance Annotations

    E-Print Network [OSTI]

    Gehani, Ashish

    Automated Storage Reclamation Using Temporal Importance Annotations Surendar Chandra, Ashish.edu Abstract This work focuses on scenarios that require the storage of large amounts of data. Such sys- tems require the ability to either continuously increase the storage space or reclaim space by deleting

  3. Enhancing Smart Home Algorithms Using Temporal Relations

    E-Print Network [OSTI]

    Cook, Diane J.

    Enhancing Smart Home Algorithms Using Temporal Relations Vikramaditya R. JAKKULA1 and Diane J COOK School of Electrical Engineering and Computer Science Abstract. Smart homes offer a potential benefit improves the performance of these algorithms and thus enhances the ability of smart homes to monitor

  4. Nordic Journal of Computing TEMPORAL CONCURRENT CONSTRAINT

    E-Print Network [OSTI]

    Palamidessi, Catuscia

    on this semantics, we develop a proof system for linear­temporal properties of these processes. The expressiveness of ntcc is illustrated by modeling cells, timed systems such as RCX controllers, multi­agent systems, Calculi for Concur­ rency, Program Specification, Timed Systems, Reactive Systems, Multi­Agent Sys­ tems

  5. Rechargeable Sensor Activation under Temporally Correlated Events

    E-Print Network [OSTI]

    Kar, Koushik

    -surveilled regions. For long term monitoring of such environments, sensors can be deployed with rechargeable their occurrences. Typically, sensors are heavily constrained in terms of energy, and thus energy usage optimally only if events are uncorrelated. Index Terms Rechargeable Sensors, Temporal Correlations, Node

  6. Mining Sequential Patterns from Temporal Streaming Data

    E-Print Network [OSTI]

    Malerba, Donato

    Mining Sequential Patterns from Temporal Streaming Data A. Marascu and F. Masseglia INRIA Sophia.Marascu,Florent.Masseglia}@sophia.inria.fr Abstract. In recent years, emerging applications introduced new con- straints for data mining methods of our knowledge, no method has been proposed for mining sequential patterns in data streams. We argue

  7. SEISMIC INTERFEROMETRY FOR TEMPORAL MONITORING Norimitsu Nakata

    E-Print Network [OSTI]

    Snieder, Roel

    SEISMIC INTERFEROMETRY FOR TEMPORAL MONITORING by Norimitsu Nakata #12;c Copyright by Norimitsu Seismic interferometry, where one computes coherency of waves between two or more receivers and averages from the first study related to seismic interferometry (although the name of seismic interferometry has

  8. Dynamics of soil gas radon concentration in a highly permeable soil based on a long-term high temporal resolution observation series

    E-Print Network [OSTI]

    Horváth, Ákos

    Dynamics of soil gas radon concentration in a highly permeable soil based on a long-term high University, Pázmány Péter sétány 1/C, 1117 Budapest, Hungary b Institute for Soil Sciences and Agricultural periodicity Time series analysis a b s t r a c t This paper studies the temporal variation of soil gas radon

  9. Evolution of transcription networks in response to temporal fluctuations

    E-Print Network [OSTI]

    Hespanha, João Pedro

    Evolution of transcription networks in response to temporal fluctuations Journal: Evolution, Evolution & Marine Biology Keywords: Population Genetics, Epistasis, Genetic Networks, Transcription Evolution: For Review Only #12;EVOLUTION OF TRANSCRIPTION NETWORKS IN RESPONSE TO TEMPORAL FLUCTUATIONS

  10. Determination of Transport Properties From Flowing Fluid Temperature LoggingIn Unsaturated Fractured Rocks: Theory And Semi-Analytical Solution

    SciTech Connect (OSTI)

    Mukhopadhyay, Sumit; Tsang, Yvonne W.

    2008-08-01

    Flowing fluid temperature logging (FFTL) has been recently proposed as a method to locate flowing fractures. We argue that FFTL, backed up by data from high-precision distributed temperature sensors, can be a useful tool in locating flowing fractures and in estimating the transport properties of unsaturated fractured rocks. We have developed the theoretical background needed to analyze data from FFTL. In this paper, we present a simplified conceptualization of FFTL in unsaturated fractured rock, and develop a semianalytical solution for spatial and temporal variations of pressure and temperature inside a borehole in response to an applied perturbation (pumping of air from the borehole). We compare the semi-analytical solution with predictions from the TOUGH2 numerical simulator. Based on the semi-analytical solution, we propose a method to estimate the permeability of the fracture continuum surrounding the borehole. Using this proposed method, we estimated the effective fracture continuum permeability of the unsaturated rock hosting the Drift Scale Test (DST) at Yucca Mountain, Nevada. Our estimate compares well with previous independent estimates for fracture permeability of the DST host rock. The conceptual model of FFTL presented in this paper is based on the assumptions of single-phase flow, convection-only heat transfer, and negligible change in system state of the rock formation. In a sequel paper [Mukhopadhyay et al., 2008], we extend the conceptual model to evaluate some of these assumptions. We also perform inverse modeling of FFTL data to estimate, in addition to permeability, other transport parameters (such as porosity and thermal conductivity) of unsaturated fractured rocks.

  11. A study of the minimum wetting rate of isothermal films flowing down on outer surface of vertical pipes

    SciTech Connect (OSTI)

    Koizumi, Yasuo; Ohtake, Hiroyasu; Ueda, Tatsuhiro

    1999-07-01

    The minimum wetting rate (MWR) was investigated experimentally with an isothermal water film flowing down on the outer surface of test pipes arranged vertically. A dry patch was generated by blowing a small air jet onto the film temporally, and observation was made to discriminate whether the dry patch was rewetted or not. The contact angle of the film at the top edge of the dry patch and the amplitude, length and velocity of large waves on the film were measured. The MWR decreased rapidly as the film flowed down and reached a nearly constant value at a position around 0.6 m down from the film inlet. There were large waves on the film. The tendency of the variation of MWR with the distance coincided well with the growth of the amplitude of large waves with the distance. The contact angle at the top edge of the dry patch varied periodically in a range synchronizing with the arrival of the waves. When the contact angle exceeded the maximum advancing contact angle, the rewetting of the dry patch was initiated. The existing correlations where the smooth surface film was assumed considerably over-predicted the MWR. The MWR was properly given by supposing that the dry patch is rewetted when the maximum of the fluctuating dynamic pressure of the film exceeds the upward component of the surface tension corresponding to the maximum advancing contact angle at the top edge of the dry patch.

  12. TEMPORAL PATTERN DISCOVERY FOR ANOMALY DETECTION IN A SMART HOME

    E-Print Network [OSTI]

    Cook, Diane J.

    TEMPORAL PATTERN DISCOVERY FOR ANOMALY DETECTION IN A SMART HOME Vikramaditya Jakkula , Diane J, cook}@eecs.wsu.edu Keywords: Knowledge discovery, smart homes, anomaly detection, temporal relations and relations on smart home datasets [10]. This paper describes a method of discovering temporal relations

  13. A Foundation for Conventional and Temporal Query Optimization

    E-Print Network [OSTI]

    Snodgrass, Richard T.

    substantially from built-in temporal support in the DBMS. To achieve this, temporal query representation DBMS architectures and ones where the temporal support is obtained via a layer on top of a conventional DBMS. This foundation captures duplicates and ordering for all queries, as well as coalescing

  14. Semantic-Based Temporal Text-Rule Mining Kjetil Nrvag

    E-Print Network [OSTI]

    Nørvåg, Kjetil

    is to find and/or verify temporal patterns: UK Bush Paris world weather dance Iraq dog Trondheim UK Bush Paris finances buy Iraq ISMIS university travel UK USA Enron money Time Temporal pattern (UK Bush) (Iraq) ? dance Iraq dog Trondheim In the example above, one possible temporal rule is the terms1 UK and Bush

  15. Propeller Flow Meter 

    E-Print Network [OSTI]

    Enciso, Juan; Santistevan, Dean; Hla, Aung K.

    2007-10-01

    Propeller flow meters are commonly used to measure water flow rate. They can also be used to estimate irrigation water use. This publication explains how to select, install, read and maintain propeller flow meters....

  16. Bacteria in shear flow

    E-Print Network [OSTI]

    Marcos, Ph.D. Massachusetts Institute of Technology

    2011-01-01

    Bacteria are ubiquitous and play a critical role in many contexts. Their environment is nearly always dynamic due to the prevalence of fluid flow: creeping flow in soil, highly sheared flow in bodily conduits, and turbulent ...

  17. Dispersed flow film boiling

    E-Print Network [OSTI]

    Yoder, Graydon L.

    1980-01-01

    Dispersed flow consists of small liquid droplets entrained in a flowing vapor. This flow regime can occur in cryogenic equipment, in steam generators, and during nuclear reactor loss of coolant accidents. A theoretical ...

  18. Optical monitor for observing turbulent flow

    DOE Patents [OSTI]

    Albrecht, Georg F. (Livermore, CA); Moore, Thomas R. (Rochester, NY)

    1992-01-01

    The present invention provides an apparatus and method for non-invasively monitoring turbulent fluid flows including anisotropic flows. The present invention uses an optical technique to filter out the rays travelling in a straight line, while transmitting rays with turbulence induced fluctuations in time. The output is two dimensional, and can provide data regarding the spectral intensity distribution, or a view of the turbulence in real time. The optical monitor of the present invention comprises a laser that produces a coherent output beam that is directed through a fluid flow, which phase-modulates the beam. The beam is applied to a temporal filter that filters out the rays in the beam that are straight, while substantially transmitting the fluctuating, turbulence-induced rays. The temporal filter includes a lens and a photorefractive crystal such as BaTiO.sub.3 that is positioned in the converging section of the beam near the focal plane. An imaging system is used to observe the filtered beam. The imaging system may take a photograph, or it may include a real time camera that is connected to a computer. The present invention may be used for many purposes including research and design in aeronautics, hydrodynamics, and combustion.

  19. Theory of solar luminosity variations

    E-Print Network [OSTI]

    H. C. Spruit

    2000-03-03

    The theory of stellar structure can be used to identify the most plausible mechanisms for the irradiance variations associated with the solar cycle. Changes in surface emissivity, i.e. the reduced cooling in spots and enhanced emission by small scale magnetic fields, are the most effective mechanisms and account for most of the observed variation. Helioseismology will soon be able to test the consequences of changes in surface emissivity, and distinguish them from other scenarios for irradiance variability.

  20. FLOW-THROUGH POROUS ELECTRODES

    E-Print Network [OSTI]

    Trainham, III, James Arthur

    2011-01-01

    configurations for flow redox battery applications: (i) theporous electrodes A flow-redox battery using flow-by poroustrue in battery applications, Flow..through porous

  1. Temporal evolution of multiple evaporating ribbon sources in a solar flare

    E-Print Network [OSTI]

    Graham, D R

    2015-01-01

    We present new results from the Interface Region Imaging Spectrograph showing the dynamic evolution of chromospheric evaporation and condensation in a flare ribbon, with the highest temporal and spatial resolution to date. IRIS observed the entire impulsive phase of the X-class flare SOL2014-09-10T17:45 using a 9.4 second cadence `sit-and-stare' mode. As the ribbon brightened successively at new positions along the slit, a unique impulsive phase evolution was observed for many tens of individual pixels in both coronal and chromospheric lines. Each activation of a new footpoint displays the same initial coronal up-flows of up to ~300 km/s, and chromospheric downflows up to 40 km/s. Although the coronal flows can be delayed by over 1 minute with respect to those in the chromosphere, the temporal evolution of flows is strikingly similar between all pixels, and consistent with predictions from hydrodynamic flare models. Given the large sample of independent footpoints, we conclude that each flaring pixel can be c...

  2. Multiphase flow calculation software

    DOE Patents [OSTI]

    Fincke, James R. (Idaho Falls, ID)

    2003-04-15

    Multiphase flow calculation software and computer-readable media carrying computer executable instructions for calculating liquid and gas phase mass flow rates of high void fraction multiphase flows. The multiphase flow calculation software employs various given, or experimentally determined, parameters in conjunction with a plurality of pressure differentials of a multiphase flow, preferably supplied by a differential pressure flowmeter or the like, to determine liquid and gas phase mass flow rates of the high void fraction multiphase flows. Embodiments of the multiphase flow calculation software are suitable for use in a variety of applications, including real-time management and control of an object system.

  3. Flow Distances on Open Flow Networks

    E-Print Network [OSTI]

    Guo, Liangzhu; Shi, Peiteng; Wang, Jun; Huang, Xiaohan; Zhang, Jiang

    2015-01-01

    Open flow network is a weighted directed graph with a source and a sink, depicting flux distributions on networks in the steady state of an open flow system. Energetic food webs, economic input-output networks, and international trade networks, are open flow network models of energy flows between species, money or value flows between industrial sectors, and goods flows between countries, respectively. Flow distances (first-passage or total) between any given two nodes $i$ and $j$ are defined as the average number of transition steps of a random walker along the network from $i$ to $j$ under some conditions. They apparently deviate from the conventional random walk distance on a closed directed graph because they consider the openness of the flow network. Flow distances are explicitly expressed by underlying Markov matrix of a flow system in this paper. With this novel theoretical conception, we can visualize open flow networks, calculating centrality of each node, and clustering nodes into groups. We apply fl...

  4. Polyakov loop renormalization with gradient flow

    E-Print Network [OSTI]

    Peter Petreczky; Hans-Peter Schadler

    2015-11-14

    We propose to use the gradient flow for the renormalization of Polyakov loops in various representations. We study Polyakov loops in 2+1 flavor QCD using the HISQ action and lattices with temporal extents $N_\\tau$=6, 8, 10 and 12 in various representations, including fundamental, sextet, adjoint, decuplet, 15-plet and 27-plet. This alternative renormalization procedure allows for the renormalization over a large temperature range from $T$=100 MeV - 800 MeV, with small errors not only for the fundamental, but also for the higher representations of the Polyakov loop. We discuss the results of this procedure and Casimir scaling of the Polyakov loop.

  5. Spatio-temporal self-organization in mudstones.

    SciTech Connect (OSTI)

    Dewers, Thomas A.

    2010-12-01

    Shales and other mudstones are the most abundant rock types in sedimentary basins, yet have received comparatively little attention. Common as hydrocarbon seals, these are increasingly being targeted as unconventional gas reservoirs, caprocks for CO2 sequestration, and storage repositories for waste. The small pore and grain size, large specific surface areas, and clay mineral structures lend themselves to rapid reaction rates, high capillary pressures, and semi-permeable membrane behavior accompanying changes in stress, pressure, temperature and chemical conditions. Under far from equilibrium conditions, mudrocks display a variety of spatio-temporal self-organized phenomena arising from nonlinear thermo-mechano-chemo-hydro coupling. Beginning with a detailed examination of nano-scale pore network structures in mudstones, we discuss the dynamics behind such self-organized phenomena as pressure solitons in unconsolidated muds, chemically-induced flow self focusing and permeability transients, localized compaction, time dependent well-bore failure, and oscillatory osmotic fluxes as they occur in clay-bearing sediments. Examples are draw from experiments, numerical simulation, and the field. These phenomena bear on the ability of these rocks to serve as containment barriers.

  6. AA DiscretizationDiscretization ProcedureProcedure forfor EvolutionaryEvolutionary VariationalVariational

    E-Print Network [OSTI]

    Nagurney, Anna

    Variational InequalitiesInequalities andand ApplicationsApplications toto aa FinancialFinancial ModelModel Patrizia Daniele VariationalD Variational InequalitiesInequalities EE QuasiQuasi--VariationalVariational InequalitiesInequalitiesVariational InequalitiesInequalities"",, Comm.Comm. PurePure ApplAppl.. MathMath..,, 2222, 493, 493--519.519. 2.2. Brezis

  7. Quantization of systems with temporally varying discretization. I. Evolving Hilbert spaces

    SciTech Connect (OSTI)

    Höhn, Philipp A.

    2014-08-15

    A temporally varying discretization often features in discrete gravitational systems and appears in lattice field theory models subject to a coarse graining or refining dynamics. To better understand such discretization changing dynamics in the quantum theory, an according formalism for constrained variational discrete systems is constructed. While this paper focuses on global evolution moves and, for simplicity, restricts to flat configuration spaces R{sup N}, a Paper II [P. A. Höhn, “Quantization of systems with temporally varying discretization. II. Local evolution moves,” J. Math. Phys., e-print http://arxiv.org/abs/arXiv:1401.7731 [gr-qc].] discusses local evolution moves. In order to link the covariant and canonical picture, the dynamics of the quantum states is generated by propagators which satisfy the canonical constraints and are constructed using the action and group averaging projectors. This projector formalism offers a systematic method for tracing and regularizing divergences in the resulting state sums. Non-trivial coarse graining evolution moves lead to non-unitary, and thus irreversible, projections of physical Hilbert spaces and Dirac observables such that these concepts become evolution move dependent on temporally varying discretizations. The formalism is illustrated in a toy model mimicking a “creation from nothing.” Subtleties arising when applying such a formalism to quantum gravity models are discussed.

  8. Portable wastewater flow meter

    DOE Patents [OSTI]

    Hunter, Robert M. (320 S. Wilson Ave., Bozeman, MT 59715)

    1999-02-02

    A portable wastewater flow meter particularly adapted for temporary use at a single location in measuring the rate of liquid flow in a circular entrance conduit of a sewer manhole both under free flow and submerged, open channel conditions and under fill pipe, surcharged conditions, comprising an apparatus having a cylindrical external surface and an inner surface that constricts the flow through the apparatus in such a manner that a relationship exists between (1) the difference between the static pressure head of liquid flowing through the entrance of the apparatus and the static pressure head of liquid flowing through the constriction, and (2) the rate of liquid flow through the apparatus.

  9. Portable wastewater flow meter

    DOE Patents [OSTI]

    Hunter, Robert M. (320 S. Wilson Ave., Bozeman, MT 59715)

    1990-01-01

    A portable wastewater flow meter particularly adapted for temporary use at a single location in measuring the rate of liquid flow in a circular entrance conduit of a sewer manhole both under free flow and submerged, open channel conditions and under full pipe, surcharged conditions, comprising an apparatus having a cylindrical external surface and an inner surface that constricts the flow through the apparatus in such a manner that a relationship exists between (1) the difference between the static pressure head of liquid flowing through the entrance of the apparatus and the static pressure head of liquid flowing through the constriction, and (2) the rate of liquid flow through the apparatus.

  10. Dynamic Multiscale Averaging (DMA) of Turbulent Flow

    SciTech Connect (OSTI)

    Richard W. Johnson

    2012-09-01

    A new approach called dynamic multiscale averaging (DMA) for computing the effects of turbulent flow is described. The new method encompasses multiple applications of temporal and spatial averaging, that is, multiscale operations. Initially, a direct numerical simulation (DNS) is performed for a relatively short time; it is envisioned that this short time should be long enough to capture several fluctuating time periods of the smallest scales. The flow field variables are subject to running time averaging during the DNS. After the relatively short time, the time-averaged variables are volume averaged onto a coarser grid. Both time and volume averaging of the describing equations generate correlations in the averaged equations. These correlations are computed from the flow field and added as source terms to the computation on the next coarser mesh. They represent coupling between the two adjacent scales. Since they are computed directly from first principles, there is no modeling involved. However, there is approximation involved in the coupling correlations as the flow field has been computed for only a relatively short time. After the time and spatial averaging operations are applied at a given stage, new computations are performed on the next coarser mesh using a larger time step. The process continues until the coarsest scale needed is reached. New correlations are created for each averaging procedure. The number of averaging operations needed is expected to be problem dependent. The new DMA approach is applied to a relatively low Reynolds number flow in a square duct segment. Time-averaged stream-wise velocity and vorticity contours from the DMA approach appear to be very similar to a full DNS for a similar flow reported in the literature. Expected symmetry for the final results is produced for the DMA method. The results obtained indicate that DMA holds significant potential in being able to accurately compute turbulent flow without modeling for practical engineering applications.

  11. Penetrative turbulence associated with mesoscale surface heat flux variations

    E-Print Network [OSTI]

    Alam, Jahrul M

    2015-01-01

    This article investigates penetrative turbulence in the atmospheric boundary layer. Using a large eddy simulation approach, we study characteristics of the mixed layer with respect to surface heat flux variations in the range from 231.48 W/m$^2$ to 925.92 W/m$^2$, and observe that the surface heterogeneity on a spatial scale of $20$ km leads to downscale turbulent kinetic energy cascade. Coherent fluctuations of mesoscale horizontal wind is observed at 100m above the ground. Such a surface induced temporal oscillations in the horizontal wind suggest a rapid jump in mesocale wind forecasts, which is difficult to parameterize using traditional one-dimensional ensemble-mean models. Although the present work is idealized at a typical scale (20km) of surface heterogeneity, the results help develop effective subgrid scale parameterization schemes for classical weather forecasting mesoscale models.

  12. Flow Equations for Hamiltonians from Continuous Unitary Transformations

    E-Print Network [OSTI]

    Bruce Henry Bartlett

    2003-05-19

    This thesis presents an overview of the flow equations recently introduced by Wegner. The little known mathematical framework of the flow in the manifold of unitarily equivalent matrices, as discovered in the mathematical literature before Wegner's paper, is established in the initial chapter and used as a background for the entire presentation. The application of flow equations to the Foldy-Wouthuysen transformation and to the elimination of the electron-phonon coupling in a solid is reviewed. Recent flow equations approaches to the Lipkin model are examined thoroughly, paying special attention to their utility near the phase change boundary. We present more robust schemes by requiring that expectation values be flow dependent; either through a variational or self-consistent calculation. The similarity renormalization group equations recently developed by Glazek and Wilson are also reviewed. Their relationship to Wegner's flow equations is investigated through the aid of an instructive model.

  13. Migration of semiflexible polymers in microcapillary flow

    E-Print Network [OSTI]

    Raghunath Chelakkot; Roland. G. Winkler; Gerhard Gompper

    2010-06-23

    The non-equilibrium structural and dynamical properties of a semiflexible polymer confined in a cylindrical microchannel and exposed to a Poiseuille flow is studied by mesoscale hydrodynamic simulations. For a polymer with a length half of its persistence length, large variations in orientation and conformations are found as a function of radial distance and flow strength. In particular, the polymer exhibits U-shaped conformations near the channel center. Hydrodynamic interactions lead to strong cross-streamline migration. Outward migration is governed by the polymer orientation and the corresponding anisotropy in its diffusivity. Strong tumbling motion is observed, with a tumbling time which exhibits the same dependence on Peclet number as a polymer in shear flow.

  14. Simple and efficient relaxation methods for interfaces separating compressible fluids, cavitating flows and

    E-Print Network [OSTI]

    , O. Le Metayer, A relaxation-projection method for compressible flows. Part II. The artificial heat speed causes inaccuracies in wave's transmission across interfaces. Moreover, volume fraction variation transmission of shocks across them. This formulation considerably simplifies numerical resolution. Following

  15. Reversals of fortune: path dependency, problem solving, and temporal cases

    E-Print Network [OSTI]

    Haydu, Jeffrey

    2010-01-01

    and as sequences of problem solving. American Journal ofpath dependency, problem solving, and temporal cases Jeffreyalternative: sequences of problem solving Putting actors at

  16. Temporal Relations of Volcanism and Hydrothermal Systems in Two...

    Open Energy Info (EERE)

    Geology, 1989 DOI Not Provided Check for DOI availability: http:crossref.org Online Internet link for Temporal Relations of Volcanism and Hydrothermal Systems in Two Areas of...

  17. Infrastructure Analysis Tools: A Focus on Cash Flow Analysis (Presentation)

    SciTech Connect (OSTI)

    Melaina, M.; Penev, M.

    2012-09-01

    NREL has developed and maintains a variety of infrastructure analysis models for the U.S. Department of Energy. Business case analysis has recently been added to this tool set. This presentation focuses on cash flow analysis. Cash flows depend upon infrastructure costs, optimized spatially and temporally, and assumptions about financing and revenue. NREL has incorporated detailed metrics on financing and incentives into the models. Next steps in modeling include continuing to collect feedback on regional/local infrastructure development activities and 'roadmap' dynamics, and incorporating consumer preference assumptions on infrastructure to provide direct feedback between vehicles and station rollout.

  18. Weak-strong clustering transition in renewing compressible flows

    E-Print Network [OSTI]

    Ajinkya Dhanagare; Stefano Musacchio; Dario Vincenzi

    2014-11-01

    We investigate the statistical properties of Lagrangian tracers transported by a time-correlated compressible renewing flow. We show that the preferential sampling of the phase space performed by tracers yields significant differences between the Lagrangian statistics and its Eulerian counterpart. In particular, the effective compressibility experienced by tracers has a non-trivial dependence on the time correlation of the flow. We examine the consequence of this phenomenon on the clustering of tracers, focusing on the transition from the weak- to the strong-clustering regime. We find that the critical compressibility at which the transition occurs is minimum when the time correlation of the flow is of the order of the typical eddy turnover time. Further, we demonstrate that the clustering properties in time-correlated compressible flows are non-universal and are strongly influenced by the spatio-temporal structure of the velocity field.

  19. Weak-strong clustering transition in renewing compressible flows

    E-Print Network [OSTI]

    Dhanagare, Ajinkya; Vincenzi, Dario

    2014-01-01

    We investigate the statistical properties of Lagrangian tracers transported by a time-correlated compressible renewing flow. We show that the preferential sampling of the phase space performed by tracers yields significant differences between the Lagrangian statistics and its Eulerian counterpart. In particular, the effective compressibility experienced by tracers has a non-trivial dependence on the time correlation of the flow. We examine the consequence of this phenomenon on the clustering of tracers, focusing on the transition from the weak- to the strong-clustering regime. We find that the critical compressibility at which the transition occurs is minimum when the time correlation of the flow is of the order of the typical eddy turnover time. Further, we demonstrate that the clustering properties in time-correlated compressible flows are non-universal and are strongly influenced by the spatio-temporal structure of the velocity field.

  20. Flow Field Flow Fractionation Method Development for Applied Bioanalysis

    E-Print Network [OSTI]

    Schachermeyer, Samantha Lynn

    2013-01-01

    E. ; Caldwell, K. , Field-Flow Fractionation Handbook. JohnJ. P. , Sedimentation field-flow-fractionation: emergence ofby sedimentation field-flow fractionation. Am. Lab. (

  1. Ultrasonic flow metering system

    DOE Patents [OSTI]

    Gomm, Tyler J. (Meridian, ID); Kraft, Nancy C. (Idaho Falls, ID); Mauseth, Jason A. (Pocatello, ID); Phelps, Larry D. (Pocatello, ID); Taylor, Steven C. (Idaho Falls, ID)

    2002-01-01

    A system for determining the density, flow velocity, and mass flow of a fluid comprising at least one sing-around circuit that determines the velocity of a signal in the fluid and that is correlatable to a database for the fluid. A system for determining flow velocity uses two of the inventive circuits with directional transmitters and receivers, one of which is set at an angle to the direction of flow that is different from the others.

  2. Elbow mass flow meter

    DOE Patents [OSTI]

    McFarland, Andrew R. (College Station, TX); Rodgers, John C. (Santa Fe, NM); Ortiz, Carlos A. (Bryan, TX); Nelson, David C. (Santa Fe, NM)

    1994-01-01

    Elbow mass flow meter. The present invention includes a combination of an elbow pressure drop generator and a shunt-type mass flow sensor for providing an output which gives the mass flow rate of a gas that is nearly independent of the density of the gas. For air, the output is also approximately independent of humidity.

  3. FLOW-THROUGH POROUS ELECTRODES

    E-Print Network [OSTI]

    Trainham, III, James Arthur

    2011-01-01

    Wilhelm. HBoundary conditions of a flow reactor. 1i Chemicala Packed-Bed Electrochemical Flow Reactor." Journal ofRichard, and Brian Gracon. "Flow-Through Porous Electrodes."

  4. Redox Flow Batteries, a Review

    E-Print Network [OSTI]

    Weber, Adam Z.

    2013-01-01

    Ltd." . Http://Plurionsystems.Com/Tech_Flow_Advantages.Html.plurionsystems.com/tech_flow_advantages.html [71] P. Leung,High Energy Density Redox Flow Device," ed: WO Patent

  5. Compositional Variation Within Hybrid Nanostructures

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration would like submit the following commentsMethodsCompositional Variation Within Hybrid

  6. Compositional Variation Within Hybrid Nanostructures

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration would like submit the following commentsMethodsCompositional Variation Within

  7. 113 Years of Physical Review: Using Flow Maps to Show Temporal and Topical Citation Patterns

    E-Print Network [OSTI]

    Indiana University

    Cyberinfrastructure for Network Science Center School of Library and Information Science, Indiana University. In 1977, the Physical Review introduced the Physics and Astronomy Classification Scheme (PACS) codes, revised, corrected and published; code(s) from the Physics and Astronomy Classification Scheme (PACS) [1

  8. Professional Human Capital Flows: Temporal Structure of Loss, Replacement and Contingent Bundling Effects on Firm Performance 

    E-Print Network [OSTI]

    Brymer, Rhett

    2012-10-19

    While resource based theory (RBT) addresses the importance of both possessing and orchestrating resources that have the potential of creating competitive advantage, it suggests little about the effects of unintentionally losing such resources...

  9. STQL --A SPATIO-TEMPORAL QUERY LANGUAGE Martin Erwig

    E-Print Network [OSTI]

    Erwig, Martin

    evolutions of spatial objects over time. We consider spatio- temporal operations that are particularly useful is to provide a DBMS data model and query language capable of handling such time-dependent geome- tries. Thereby. Our modeling also includes the sim- pler, discrete case where temporal evolutions are stepwise

  10. Negotiation for Automated Generation of Temporal Multimedia Presentations

    E-Print Network [OSTI]

    Hollerer, Tobias

    Negotiation for Automated Generation of Temporal Multimedia Presentations Mukesh Dalal, Steven, are involved. We de- scribe the design and implementation of a knowledge-based system that generates customized speech, written text, and graphics are generated and coordinated. Our emphasis is on how temporal media

  11. Network architecture and spatio-temporally symmetric dynamics

    E-Print Network [OSTI]

    Török, Andrew

    Network architecture and spatio-temporally symmetric dynamics Kresimir Josi´c Department such dynamics robustly. These characteristics of network architecture are not captured by the typical general architectures and dynamics. Key words: Spatio-temporal patterns, coupled cell network PACS: 05

  12. Spatio-temporal modelling of corrosion in an industrial furnace

    E-Print Network [OSTI]

    Little, John

    Spatio-temporal modelling of corrosion in an industrial furnace John Little, Michael Goldstein) 191 334 3051 Abstract Optimal inspection and maintenance of complex systems in modern industry-scale industrial furnace subject to corrosion will be considered. A suitable Bayesian spatio-temporal dynamic

  13. On Managing Temporal Information for Handling Durative Actions in LPG

    E-Print Network [OSTI]

    Gerevini, Alfonso E.

    On Managing Temporal Information for Handling Durative Actions in LPG Alfonso Gerevini, Alessandro Branze 38, 25123 Brescia, Italy fgerevini,saetti,serinag@ing.unibs.it Abstract. LPG is a recent planner good performance. This paper focuses on how LPG represents and manages temporal information to handle

  14. SALT--Structured Assertion Language for Temporal Logic

    E-Print Network [OSTI]

    Cengarle, María Victoria

    SALT--Structured Assertion Language for Temporal Logic Andreas Bauer, Martin Leucker , and Jonathan,leucker,streit}@informatik.tu-muenchen.de Abstract. This paper presents Salt. Salt is a general purpose speci- fication and assertion language other formalisms used for temporal specification of properties, Salt does not target a specific domain

  15. SALT---Structured Assertion Language for Temporal Logic

    E-Print Network [OSTI]

    Leucker, Martin

    SALT---Structured Assertion Language for Temporal Logic Andreas Bauer, Martin Leucker,leucker,streit}@informatik.tu­muenchen.de Abstract. This paper presents Salt. Salt is a general purpose speci­ fication and assertion language other formalisms used for temporal specification of properties, Salt does not target a specific domain

  16. Temporal Logic in Information Systems BRICS Minicourse Lecture Notes \\Lambda

    E-Print Network [OSTI]

    Toman, David

    Temporal Logic in Information Systems BRICS Mini­course Lecture Notes \\Lambda Jan Chomicki Dept the fundamental vari­ eties of temporal logic and describe their applications in information systems. Several of the Danish National Research Foundation, 1997. c fl Jan Chomicki and David Toman, 1997. Full version

  17. Temporal Support for Persistent Stored Modules Richard T. Snodgrass 1

    E-Print Network [OSTI]

    Snodgrass, Richard T.

    -complete portion of SQL, that of persistent stored modules (PSM). Our approach requires minor new syntax beyond that already in SQL/Temporal to define and to invoke PSM procedures and functions, thereby extending a transformation that converts Temporal SQL/PSM to conventional SQL/PSM. To support sequenced eval- uation

  18. TEMPORAL AND SPATIAL PREDICTION OF RADIOCAESIUM TRANSFER TO FOOD PRODUCTS

    E-Print Network [OSTI]

    Crout, Neil

    1 TEMPORAL AND SPATIAL PREDICTION OF RADIOCAESIUM TRANSFER TO FOOD PRODUCTS A.G. GILLETT1 , N #12;2 ABSTRACT A recently developed semi-mechanistic temporal model to is used predict food product (exchangeable K, pH, % clay and % organic matter content). A raster database of soil characteristics

  19. Adaptable Query Optimization and Evaluation in Temporal Middleware

    E-Print Network [OSTI]

    Snodgrass, Richard T.

    that such data- base applications may benefit substantially from built-in temporal support in the DBMS the DBMS proper or as a source level translation from temporal queries to conventional SQL. This paper proposes a new approach: using a middleware component on top of a conventional DBMS. This component accepts

  20. Implementing Temporal Integrity Constraints Using an Active DBMS

    E-Print Network [OSTI]

    Toman, David

    Implementing Temporal Integrity Constraints Using an Active DBMS David Toman Jan Chomicki constraints formu­ lated in past temporal logic into rules of the Starburst DBMS. During the compilation Logic; the constraint checking can then be done with­ out referring to the whole past history

  1. Handling Database Updates in Two-dimensional Temporal Logic

    E-Print Network [OSTI]

    Finger, Marcelo

    Handling Database Updates in Two-dimensional Temporal Logic Marcelo Finger y Department (Draft version 0.2) Abstract This paper deals with the description of the evolution of the understanding in database systems due to updates. For this purpose, we introduce a two-dimensional temporal logic

  2. Predicting Protein Folding Kinetics via Temporal Logic Model Checking

    E-Print Network [OSTI]

    Predicting Protein Folding Kinetics via Temporal Logic Model Checking Christopher James Langmead award from the U.S. Department of Energy. #12;Keywords: protein folding, model checking, temporal logic #12;Abstract We present a novel approach for predicting protein folding kinetics using techniques from

  3. Constraint Orientated Specification with CSP and Real Time Temporal Logic

    E-Print Network [OSTI]

    Kent, University of

    Constraint Orientated Specification with CSP and Real Time Temporal Logic Justin Pearson Department Processes (CSP) [Hoa85] and a version of Propositional Temporal Logic (PTL), derived from [Eme90]. CSP. The behaviour of a CSP process is dependent on its environment; it is therefore difficult to assert global

  4. Spatial Patterns and Temporal Trajectories of the Bog Ground Layer

    E-Print Network [OSTI]

    Benscoter, Brian W.

    Spatial Patterns and Temporal Trajectories of the Bog Ground Layer Along a Post-Fire Chronosequence following fire is poorly understood. Here we assess spatial and temporal changes in community composition along a chronosequence of post-fire bogs (1­105 years since fire) in north central Alberta, Canada. We

  5. Temporal Variability of Waves at the Proton Cyclotron Frequency Upstream from Mars: Implications for Mars Distant Hydrogen Exosphere

    E-Print Network [OSTI]

    Bertucci, Cesar; Chaufray, Jean-Yves; Gomez, Daniel; Mazelle, Christian; Delva, Magda; Modolo, Ronan; Gonzalez-Galindo, Francisco; Brain, David Andrew

    2013-01-01

    We report on the temporal variability of the occurrence of waves at the local proton cyclotron frequency upstream from the Martian bow shock from Mars Global Surveyor observations during the first aerobraking and science phasing orbit periods. Observations at high southern latitudes during minimum-to-mean solar activity show that the wave occurrence rate is significantly higher around perihelion southern summer solstice and lower around the same hemisphere's spring and autumn equinoxes. A similar trend is observed in the hydrogen (H) exospheric density profiles over the Martian South Pole obtained from a model including UV thermospheric heating effects. In spite of the complexity in the ion pick-up and plasma wave generation and evolution processes, these results support the idea that variations in the occurrence of waves could be used to study the temporal evolution of the distant Martian H corona and its coupling with the thermosphere at altitudes currently inaccessible to direct measurements.

  6. Variation of hydraulic conductance of some adult conifers under natural conditions

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Variation of hydraulic conductance of some adult conifers under natural conditions A. Granier, N; in the liquid phase, the flow depends upon water potential gradients and hydraulic conductance from the soil present here some evaluations of hydraulic conductance of trees growing under natural conditions. Data

  7. DNA Content Variation and Its Significance in the Evolution of the Genus Micrasterias (Desmidiales,

    E-Print Network [OSTI]

    in their evolutionary history. However, study of genome size variation in microalgae lags behind that of higher plants Micrasterias. We applied flow-cytometric techniques of DNA quantification to microalgae and mapped the importance of cell/life cycle studies for interpretation of DNA content measurements in microalgae. Citation

  8. Scatterometer observations of wind variations induced by oceanic islands: Implications for

    E-Print Network [OSTI]

    Scatterometer observations of wind variations induced by oceanic islands: Implications for wind-driven of the Hawaiian and Cabo Verde islands on the mean atmospheric flow. A wake of weak winds, flanked by accelerated winds, appears for each major island of both archipelagos. The resulting wind stress curl displays

  9. Lateral flow strip assay

    DOE Patents [OSTI]

    Miles, Robin R. (Danville, CA); Benett, William J. (Livermore, CA); Coleman, Matthew A. (Oakland, CA); Pearson, Francesca S. (Livermore, CA); Nasarabadi, Shanavaz L. (Livermore, CA)

    2011-03-08

    A lateral flow strip assay apparatus comprising a housing; a lateral flow strip in the housing, the lateral flow strip having a receiving portion; a sample collection unit; and a reagent reservoir. Saliva and/or buccal cells are collected from an individual using the sample collection unit. The sample collection unit is immersed in the reagent reservoir. The tip of the lateral flow strip is immersed in the reservoir and the reagent/sample mixture wicks up into the lateral flow strip to perform the assay.

  10. Free surface flows with large slopes: beyond lubrication theory

    E-Print Network [OSTI]

    Snoeijer, J H

    2006-01-01

    The description of free surface flows can often be simplified to thin film (or lubrication) equations, when the slopes of the liquid-gas interface are small. Here we present a long wavelength theory that remains fully quantitative for steep interface slopes, by expanding about Stokes flow in a wedge. For small capillary numbers, the variations of the interface slope are slow and can be treated perturbatively. This geometry occurs naturally for flows with contact lines: we quantify the difference with ordinary lubrication theory through a numerical example and analytically recover the full Cox-Voinov asymptotic solution.

  11. Low flow fume hood

    DOE Patents [OSTI]

    Bell, Geoffrey C. (Pleasant Hill, CA); Feustel, Helmut E. (Albany, CA); Dickerhoff, Darryl J. (Berkeley, CA)

    2002-01-01

    A fume hood is provided having an adequate level of safety while reducing the amount of air exhausted from the hood. A displacement flow fume hood works on the principal of a displacement flow which displaces the volume currently present in the hood using a push-pull system. The displacement flow includes a plurality of air supplies which provide fresh air, preferably having laminar flow, to the fume hood. The displacement flow fume hood also includes an air exhaust which pulls air from the work chamber in a minimally turbulent manner. As the displacement flow produces a substantially consistent and minimally turbulent flow in the hood, inconsistent flow patterns associated with contaminant escape from the hood are minimized. The displacement flow fume hood largely reduces the need to exhaust large amounts of air from the hood. It has been shown that exhaust air flow reductions of up to 70% are possible without a decrease in the hood's containment performance. The fume hood also includes a number of structural adaptations which facilitate consistent and minimally turbulent flow within a fume hood.

  12. Stratum Approaches to Temporal DBMS Implementation Kristian Torp Christian S. Jensen

    E-Print Network [OSTI]

    Snodgrass, Richard T.

    Stratum Approaches to Temporal DBMS Implementation Kristian Torp Christian S. Jensen Department temporal DBMSs have assumed that a temporal DBMS must be built from scratch, employing an integrated a temporal DBMS as a stratum on top of an existing non-temporal DBMS, rendering implementation more feasible

  13. Streaming potential measurements 2. Relationship between electrical and hydraulic flow

    E-Print Network [OSTI]

    Avouac, Jean-Philippe

    that variations of electric potential observed in a variety of geophysical contexts (geothermal fields, volcanoes gradient, is measured by recording the voltage across a sample through which an electrolyte is flowing to the pressure gradient and a quantity called the potential, which characterizes the structure of the EDL

  14. Spatial variation decomposition via sparse regression

    E-Print Network [OSTI]

    Zhang, Wangyang

    In this paper, we briefly discuss the recent development of a novel sparse regression technique that aims to accurately decompose process variation into two different components: (1) spatially correlated variation, and (2) ...

  15. SEASONAL VARIATIONS in TOXICITY of BUTTER CLAMS

    E-Print Network [OSTI]

    'iations in the toxicity of the clams from the different areas and the variation in tcxicity between the siphon

  16. Facet bending in the driven crystalline curvature flow in the plane

    E-Print Network [OSTI]

    Ikegami, Takashi

    Facet bending in the driven crystalline curvature flow in the plane Yoshikazu Giga1 , Piotr Rybka2, then they begin to bend. Key words: singular energies, bending of facets, driven curvature flow, variational prin- clidean curvature. In this paper we are interested in the case when is not C1, for example

  17. Compositional Variation Within Hybrid Nanostructures

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration would like submit the following commentsMethods forPortalCompositionCompositional Variation

  18. Compositional Variation Within Hybrid Nanostructures

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home Room News PublicationsAuditsCluster Compatibilitydefault Changes fromCompositional Variation Within

  19. Aero-Optical and Flow Measurements Over a Flat-Windowed Turret

    E-Print Network [OSTI]

    Gordeyev, Stanislav

    Aero-Optical and Flow Measurements Over a Flat-Windowed Turret Stanislav Gordeyev University the aircraft, referred to as the aero-optic problem [1], and the intervening, orders- propagation effects on the beam; however, both the spatial and temporal bandwidths of the aero-optic problem

  20. ENHANCEMENT OF PHOTOSPHERIC MERIDIONAL FLOW BY RECONNECTION PROCESSES L. A. Fisk,1

    E-Print Network [OSTI]

    Roussev, Ilia I.

    simulate the two-dimensional transport of the open magnetic flux on the surface of the Sun. The temporal: MHD -- Sun: activity -- Sun: corona -- Sun: magnetic fields -- Sun: photosphere 1. INTRODUCTION meridional flow was done by tracking the motions of magnetic features on the solar surface using magnetogram

  1. Anthropogenic carbon dioxide transport in the Southern Ocean driven by Ekman flow

    E-Print Network [OSTI]

    Miami, University of

    LETTERS Anthropogenic carbon dioxide transport in the Southern Ocean driven by Ekman flow T. Ito1 between oceanic carbon uptake and climate variability through the temporal variability of Ekman transport carbon fluxes are locally dominated by the imprint of mesoscale eddies, the Ekman transport

  2. Pipe Flow System Holly Guest

    E-Print Network [OSTI]

    Clement, Prabhakar

    Pipe Flow System Design Holly Guest #12;Problem · An engineer is asked to compute the flow rate · Flow type: Turbulent or Laminar flow · Flow rate · Frictional head loss · Optimal diameters if a pump · = - ( . + . ) · f = friction factor · = relative roughness = · = Reynolds Number = · Laminar flow: 2000

  3. Flow patterns in vertical two-phase flow

    SciTech Connect (OSTI)

    McQuillan, K.W.; Whalley, P.B.

    1985-03-01

    This paper is concerned with the flow patterns which occur in upwards gas-liquid two-phase flow in vertical tubes. The basic flow patterns are described and the use of flow patter maps is discussed. The transition between plug flow and churn flow is modelled under the assumption that flooding of the falling liquid film limits the stability of plug flow. The resulting equation is combined with other flow pattern transition equations to produce theoretical flow pattern maps, which are then tested against experimental flow pattern data. Encouraging agreement is obtained.

  4. Full waveform inversion of solar interior flows

    SciTech Connect (OSTI)

    Hanasoge, Shravan M.

    2014-12-10

    The inference of flows of material in the interior of the Sun is a subject of major interest in helioseismology. Here, we apply techniques of full waveform inversion (FWI) to synthetic data to test flow inversions. In this idealized setup, we do not model seismic realization noise, training the focus entirely on the problem of whether a chosen supergranulation flow model can be seismically recovered. We define the misfit functional as a sum of L {sub 2} norm deviations in travel times between prediction and observation, as measured using short-distance filtered f and p {sub 1} and large-distance unfiltered p modes. FWI allows for the introduction of measurements of choice and iteratively improving the background model, while monitoring the evolution of the misfit in all desired categories. Although the misfit is seen to uniformly reduce in all categories, convergence to the true model is very slow, possibly because it is trapped in a local minimum. The primary source of error is inaccurate depth localization, which, due to density stratification, leads to wrong ratios of horizontal and vertical flow velocities ({sup c}ross talk{sup )}. In the present formulation, the lack of sufficient temporal frequency and spatial resolution makes it difficult to accurately localize flow profiles at depth. We therefore suggest that the most efficient way to discover the global minimum is to perform a probabilistic forward search, involving calculating the misfit associated with a broad range of models (generated, for instance, by a Monte Carlo algorithm) and locating the deepest minimum. Such techniques possess the added advantage of being able to quantify model uncertainty as well as realization noise (data uncertainty).

  5. Quantization of systems with temporally varying discretization. II. Local evolution moves

    SciTech Connect (OSTI)

    Höhn, Philipp A.

    2014-10-15

    Several quantum gravity approaches and field theory on an evolving lattice involve a discretization changing dynamics generated by evolution moves. Local evolution moves in variational discrete systems (1) are a generalization of the Pachner evolution moves of simplicial gravity models, (2) update only a small subset of the dynamical data, (3) change the number of kinematical and physical degrees of freedom, and (4) generate a dynamical (or canonical) coarse graining or refining of the underlying discretization. To systematically explore such local moves and their implications in the quantum theory, this article suitably expands the quantum formalism for global evolution moves, constructed in Paper I [P. A. Höhn, “Quantization of systems with temporally varying discretization. I. Evolving Hilbert spaces,” J. Math. Phys. 55, 083508 (2014); e-print http://arxiv.org/abs/arXiv:1401.6062 [gr-qc

  6. Reward system and temporal pole contributions to affective evaluation during a first person shooter video game

    E-Print Network [OSTI]

    Mathiak, Krystyna A; Klasen, Martin; Weber, René; Ackermann, Hermann; Shergill, Sukhwinder S; Mathiak, Klaus

    2011-01-01

    Y: The Enigmatic temporal pole: a review of findings onS, Miyashita Y: Temporal pole activity during perception ofReward system and temporal pole contributions to affective

  7. Temporal evolution of long-timescale periodicities in ULX NGC 5408 X-1

    E-Print Network [OSTI]

    An, Tao; Wang, Jun-Yi

    2015-01-01

    Context. NGC 5408 X-1 is one of the few ultraluminous X-ray sources with an extensive monitoring program in X-rays (a temporal baseline of 4.2 yr), making it one of the most suitable candidates to study the long-timescale quasi-periodic oscillations (QPOs). Aims. Previous timing analysis of the Swift data of NGC 5408 X-1 led to detection of multiple periodicities ranging from 2.6 d to 230 d. In this paper, we focus on the statistical significance and the temporal evolution of these periodicities. Methods. A time-series analysis technique in the time-frequency domain, the weighted wavelet Z-transform (WWZ), was employed to identify the periodicities and trace their variations with time. Results. Three periodic components were detected from the WWZ periodogram, corresponding to periods of 2.65$\\pm$0.01 d, 115.4$\\pm$14.4 d and 189.1$\\pm$15.2 d. All three have statistical significance higher than 99.74%. The 2.65-d periodicity is quite stable in the majority of the light curve. The 115-d periodicity is the most p...

  8. Forced Granular Orifice Flow

    E-Print Network [OSTI]

    Zheng Peng; Hepeng Zheng; Yimin Jiang

    2009-09-06

    The flow of granular material through an orifice is studied experimentally as a function of force $F$ pushing the flow. It is found that the flow rate increases linearly with $F$ -- a new, unexpected result that is in contrast to the usual view that $F$, completely screened by an arch formed around the orifice, has no way of altering the rate. Employing energy balance, we show that this behavior results mainly from dissipation in the granular material.

  9. Turbulent flow in graphene

    E-Print Network [OSTI]

    Kumar S. Gupta; Siddhartha Sen

    2010-06-05

    We demonstrate the possibility of a turbulent flow of electrons in graphene in the hydrodynamic region, by calculating the corresponding turbulent probability density function. This is used to calculate the contribution of the turbulent flow to the conductivity within a quantum Boltzmann approach. The dependence of the conductivity on the system parameters arising from the turbulent flow is very different from that due to scattering.

  10. Solids mass flow determination

    DOE Patents [OSTI]

    Macko, Joseph E. (Hempfield Township, Westmoreland County, PA)

    1981-01-01

    Method and apparatus for determining the mass flow rate of solids mixed with a transport fluid to form a flowing mixture. A temperature differential is established between the solids and fluid. The temperature of the transport fluid prior to mixing, the temperature of the solids prior to mixing, and the equilibrium temperature of the mixture are monitored and correlated in a heat balance with the heat capacities of the solids and fluid to determine the solids mass flow rate.

  11. Surfactant-driven flow transitions in evaporating droplets

    E-Print Network [OSTI]

    Marin, Alvaro; Rossi, Massimiliano; Kähler, Christian J

    2015-01-01

    An evaporating droplet is a dynamic system in which flow is spontaneously generated to minimize the surface energy, dragging particles to the borders and ultimately resulting in the so-called "coffee-stain effect". The situation becomes more complex at the droplet's surface, where surface tension gradients of different nature can compete with each other yielding different scenarios. With careful experiments and with the aid of 3D particle tracking techniques, we are able to show that different types of surfactants turn the droplet's surface either rigid or elastic, which alters the evaporating fluid flow, either enhancing the classical coffee-stain effect or leading to a total flow inversion. Our measurements lead to unprecedented and detailed measurements of the surface tension difference along an evaporating droplet's surface with good temporal and spatial resolution.

  12. High-order temporal coherences of chaotic and laser light

    E-Print Network [OSTI]

    Berggren, Karl K.

    We demonstrate a new approach to measuring high-order temporal coherences that uses a four-element superconducting nanowire single-photon detector. The four independent, interleaved single-photon-sensitive elements parse ...

  13. Cineplastic : temporal paradox in the movement-image medium

    E-Print Network [OSTI]

    Hanks, Travis W. (Travis Wesley)

    2006-01-01

    It could be argued that the term 'digital' as a prefix to architecture is evidence that contemporary design practice is lost in time. Modernity's predilection of spatial constructs over temporal ones continues to cast a ...

  14. Temporally Scalable Visual SLAM using a Reduced Pose Graph

    E-Print Network [OSTI]

    Johannsson, Hordur

    2012-05-25

    In this paper, we demonstrate a system for temporally scalable visual SLAM using a reduced pose graph representation. Unlike previous visual SLAM approaches that use keyframes, our approach continually uses new measurements ...

  15. Temporally scalable visual SLAM using a reduced pose graph

    E-Print Network [OSTI]

    Johannsson, Hordur

    In this paper, we demonstrate a system for temporally scalable visual SLAM using a reduced pose graph representation. Unlike previous visual SLAM approaches that maintain static keyframes, our approach uses new measurements ...

  16. Learning temporal statistics for sensory predictions in mild cognitive impairment

    E-Print Network [OSTI]

    Di Bernardi Luft, Caroline; Baker, Rosalind; Bentham, Peter; Kourtzi, Zoe

    2015-06-18

    of processing and longer response times (Curran, 1997; Simon, Yokomizo, & Bottino, 2012). In contrast, using an explicit prediction test, we demonstrate that predictions related to identification of objects are facilitated by implicit knowledge of temporal...

  17. Spatio-Temporal Conceptual Models: Data Structures + Space + Time

    E-Print Network [OSTI]

    Libre de Bruxelles, Université

    facilities. Responses to such requirements may be found in Geographic Information Systems (GIS), in some DBMS are needed. Major DBMS tools are incorporating facilities for spatial or temporal data management (e

  18. Spatio-temporal resolution of primary processes of photosynthesis

    E-Print Network [OSTI]

    Junge, Wolfgang

    Spatio-temporal resolution of primary processes of photosynthesis Wolfgang Junge* Received 24th the founders of atomic and molecular physics convened in 1927 at the 5th Solvay Conference on "Electrons

  19. Predicting Protein Folding Kinetics via Temporal Logic Model Checking: Extended

    E-Print Network [OSTI]

    Langmead, Christopher James

    Predicting Protein Folding Kinetics via Temporal Logic Model Checking: Extended Abstract Abstract. We present a novel approach for predicting protein folding kinetics using techniques from checking. We tested our method on 19 test proteins. The quantitative predictions regarding folding rates

  20. On Temporal Planning as CSP Amol Dattatraya Mali

    E-Print Network [OSTI]

    Mali, Amol D.

    On Temporal Planning as CSP Amol Dattatraya Mali Electrical Engg. & Computer Science, University of Wisconsin, Milwaukee, WI 53211 mali@miller.cs.uwm.edu, Fax: 1­414­229­2769 Abstract (Appears as a regular

  1. On Temporal Planning as CSP Amol Dattatraya Mali

    E-Print Network [OSTI]

    Mali, Amol D.

    On Temporal Planning as CSP Amol Dattatraya Mali Electrical Engg. & Computer Science, University of Wisconsin, Milwaukee, WI 53211 mali@miller.cs.uwm.edu, Fax: 1-414-229-2769 Abstract (Appears as a regular

  2. Time-Varying Networks: Recovering Temporally Rewiring Genetic

    E-Print Network [OSTI]

    Murphy, Robert F.

    structures. Using a new machine learning method called Tesla, which builds on a novel temporal logistic regression technique, we report the first successful genome-wide reverse- engineering of the latent sequence

  3. In the study of olfactory orientation in insects to general, non-pheromonal odors, temporal and spatial variation in odor

    E-Print Network [OSTI]

    Getz, Wayne M.

    controlled by electromagnetic valves. The responses of sensory neurons were recorded using a tungsten and measuring the concentration of smoke passing through a light beam. Spike frequency varied with odorant

  4. THE INFLUENCE OF ENVIRONMENTAL FACTORS ON SPATIAL AND TEMPORAL VARIATION OF FISH ASSEMBLAGES IN THE LOWER BRAZOS RIVER, TEXAS 

    E-Print Network [OSTI]

    LI, RAYMOND Y.

    2003-01-01

    of willow Salix sp., eastern cottonwood Populus deltoides, and sycamore Platanus occidentalis extended along both banks for most of the reach. This river segment was selected because it contained representative habitats of the lower Brazos River...

  5. Temporal and spatial distribution of the black-legged tick, Ixodes scapularis, in Texas and its association with climate variation 

    E-Print Network [OSTI]

    Santelises, Joshua Steven

    2013-02-06

    of the tick vector, Ixodes scapularis. This study extracted more than 950 collection records of adult I. scapularis from the state-federal tick surveillance program conducted by the Texas Animal Health Commission and USDA, APHIS, Veterinary Services from 1990...

  6. Temporal and spatial variations of butyltin concentrations in bivalve and sediment samples from some coastal areas of the United States 

    E-Print Network [OSTI]

    Garcia-Romero, Bernardo

    1988-01-01

    . ) in sediments. Total butyltin concentrations ranged from &5 to 3760 (640 avg, ) and from &5 to 282 (36 avg. ) ng Sn/g dry weight in bivalve and sediment samples, respectively. Myri/us edulis (886 ng Sn/g) had higher average total butyltin concentrations than... Crassnstrea virginica (328 ng Sn/g). The range and average of thc concentration of total bulyltins in bivalves from the West coast were higher than in bivalves from the Gulf of Mexico or from the East coast. Butyltin contamination in the marine environment...

  7. Evaluation of an 18-year CMAQ simulation: Seasonal variations and long-term temporal changes in sulfate and nitrate

    E-Print Network [OSTI]

    largely captures the seasonal and long-term changes in sulfur compounds. The modeling system generally and measured concentrations of sulfur and nitrogen compounds in wet and dry deposition over an 18-year period resulted in large decreases in sulfur dioxide (SO2) emissions by 1995, and nitrogen oxide (NOx) trading

  8. Spatio-temporal variation in the pollination mode of Buxus balearica (Buxaceae), an ambophilous and selfing species: mainland-island

    E-Print Network [OSTI]

    Traveset, Anna

    and selfing species: mainland-island comparison. Á/ Ecography 28: 640Á/652. Mixed-pollination systems may of mixed-pollination systems, since island populations differ not only in genetical (Frank- man 1997, 1998 mainland-island comparisons of breeding systems and pollination modes (but see Larson and Barrett 1998

  9. Temporal variation in species recruitment and dendroecology of an old-growth white oak forest in the Virginia Piedmont, USA

    E-Print Network [OSTI]

    Abrams, Marc David

    Building, Pennsylvania State University, University Park, PA 16802, USA Received 18 November 1998; accepted, indicative of moderate- and small-scale disturbances occurred in most of the oldest trees during the last 200, periodicity and intensity of disturbance (such as wind, ®re and insect outbreaks), the impact of climate

  10. Spatial and temporal climate variations influencing medium-range temperature predictions over south-central European Russia 

    E-Print Network [OSTI]

    Johnson, Jeffrey Edward

    1990-01-01

    predictions than individual forecasts, alone. Considerable hindcast skill could be gained when combing two predictive schemes in an optimal (i. e. , error-minimizing) fashion. This method was applied to long-range forecasting ol' monthly mean tropical... Air Force, Air Force Institute of Technology. A final thanks to Jess f' or being there at the right time (actually, you were one year too late!). You made the final climb over the top worthwhile. Vii C'HAPTER TABLE OF CONTENTS P n'e I IV TRODI...

  11. Balanced Flow Geostrophic, Inertial, Gradient, and Cyclostrophic Flow

    E-Print Network [OSTI]

    Hennon, Christopher C.

    Balanced Flow Geostrophic, Inertial, Gradient, and Cyclostrophic Flow The types of atmospheric flows describe here have the following characteristics: 1) Steady state (meaning that the flows do surfaces) These are "idealized" flows, created by balances of horizontal forces. They provide a qualitative

  12. Productivity & Energy Flow

    E-Print Network [OSTI]

    Mitchell, Randall J.

    1 Productivity & Energy Flow Ecosystem approach, focuses: on flow of energy, water, and nutrients (capture) of energy by autotrophs Gross (total) Net (total ­ costs) Secondary productivity- capture of energy by herbivores http://sciencebitz.com/?page_id=204 What Controls the Primary Productivity

  13. Elbow mass flow meter

    DOE Patents [OSTI]

    McFarland, A.R.; Rodgers, J.C.; Ortiz, C.A.; Nelson, D.C.

    1994-08-16

    The present invention includes a combination of an elbow pressure drop generator and a shunt-type mass flow sensor for providing an output which gives the mass flow rate of a gas that is nearly independent of the density of the gas. For air, the output is also approximately independent of humidity. 3 figs.

  14. Microelectromechanical flow control apparatus

    SciTech Connect (OSTI)

    Okandan, Murat (NE Albuquerque, NM)

    2009-06-02

    A microelectromechanical (MEM) flow control apparatus is disclosed which includes a fluid channel formed on a substrate from a first layer of a nonconducting material (e.g. silicon nitride). A first electrode is provided on the first layer of the nonconducting material outside the flow channel; and a second electrode is located on a second layer of the nonconducting material above the first layer. A voltage applied between the first and second electrodes deforms the fluid channel to increase its cross-sectional size and thereby increase a flow of a fluid through the channel. In certain embodiments of the present invention, the fluid flow can be decreased or stopped by applying a voltage between the first electrode and the substrate. A peristaltic pumping of the fluid through the channel is also possible when the voltage is applied in turn between a plurality of first electrodes and the substrate. A MEM flow control assembly can also be formed by providing one or more MEM flow control devices on a common substrate together with a submicron filter. The MEM flow control assembly can optionally include a plurality of pressure sensors for monitoring fluid pressure and determining flow rates through the assembly.

  15. Effect of flow fluctuations and nonflow on elliptic flow methods

    E-Print Network [OSTI]

    Ollitrault, Jean-Yves

    2009-01-01

    24.10.Nz I. INTRODUCTION II. FLOW METHODS Elliptic ?ow hasin the participant plane. Flow methods involve variousow e?ects are negligible. Flow ?uctuations modify both the

  16. A Holistic Framework for Environmental Flows Determination in Hydropower Contexts

    SciTech Connect (OSTI)

    McManamay, Ryan A; Bevelhimer, Mark S

    2013-05-01

    Among the ecological science community, the consensus view is that the natural flow regime sustains the ecological integrity of river systems. This prevailing viewpoint by many environmental stakeholders has progressively led to increased pressure on hydropower dam owners to change plant operations to affect downstream river flows with the intention of providing better conditions for aquatic biological communities. Identifying the neccessary magnitude, frequency, duration, timing, or rate of change of stream flows to meet ecological needs in a hydropower context is challenging because the ecological responses to changes in flows may not be fully known, there are usually a multitude of competing users of flow, and implementing environmental flows usually comes at a price to energy production. Realistically, hydropower managers must develop a reduced set of goals that provide the most benefit to the identified ecological needs. As a part of the Department of Energy (DOE) Water Power Program, the Instream Flow Project (IFP) was carried out by Oak Ridge National Laboratory (ORNL), Pacific Northwest National Laboratory (PNNL), and Argon National Laboratory (ANL) as an attempt to develop tools aimed at defining environmental flow needs for hydropower operations. The application of these tools ranges from national to site-specific scales; thus, the utility of each tool will depend on various phases of the environmental flow process. Given the complexity and sheer volume of applications used to determine environmentally acceptable flows for hydropower, a framework is needed to organize efforts into a staged process dependent upon spatial, temporal, and functional attributes. By far, the predominant domain for determining environmental flows related to hydropower is within the Federal Energy Regulatory Commission (FERC) relicensing process. This process can take multiple years and can be very expensive depending on the scale of each hydropower project. The utility of such a framework is that it can expedite the environmental flow process by 1) organizing data and applications to identify predictable relationships between flows and ecology, and 2) suggesting when and where tools should be used in the environmental flow process. In addition to regulatory procedures, a framework should also provide the coordination for a comprehensive research agenda to guide the science of environmental flows. This research program has further reaching benefits than just environmental flow determination by providing modeling applications, data, and geospatial layers to inform potential hydropower development. We address several objectives within this document that highlight the limitations of existing environmental flow paradigms and their applications to hydropower while presenting a new framework catered towards hydropower needs. Herein, we address the following objectives: 1) Provide a brief overview of the Natural Flow Regime paradigm and existing environmental flow frameworks that have been used to determine ecologically sensitive stream flows for hydropower operations. 2) Describe a new conceptual framework to aid in determining flows needed to meet ecological objectives with regard to hydropower operations. The framework is centralized around determining predictable relationships between flow and ecological responses. 3) Provide evidence of how efforts from ORNL, PNNL, and ANL have filled some of the gaps in this broader framework, and suggest how the framework can be used to set the stage for a research agenda for environmental flow.

  17. Bedrock Erosion by Granular Flow

    E-Print Network [OSTI]

    Hsu, Leslie

    2010-01-01

    of boulders later in the flow when the matrix has thickenedMaximum height of the flow is 3.3 m. Appendix A true storyThe physics of debris flows, Reviews of Geophysics 35(3),

  18. Magnetically stimulated fluid flow patterns

    SciTech Connect (OSTI)

    Martin, Jim; Solis, Kyle

    2014-03-06

    Sandia National Laboratories' Jim Martin and Kyle Solis explain research on the effects of magnetic fields on fluid flows and how they stimulate vigorous flows. Fluid flow is a necessary phenomenon in everything from reactors to cooling engines in cars.

  19. Magnetically stimulated fluid flow patterns

    ScienceCinema (OSTI)

    Martin, Jim; Solis, Kyle

    2014-08-06

    Sandia National Laboratories' Jim Martin and Kyle Solis explain research on the effects of magnetic fields on fluid flows and how they stimulate vigorous flows. Fluid flow is a necessary phenomenon in everything from reactors to cooling engines in cars.

  20. Redox Flow Batteries, a Review

    E-Print Network [OSTI]

    Weber, Adam Z.

    2013-01-01

    of a Vanadium Redox-Flow Battery to Maintain Power Quality,"Fuel System Using Redox Flow Battery," ed: WO Patentand D. B. Hickey, "Redox Flow Battery System for Distributed

  1. Composition Pulse Time-Of-Flight Mass Flow Sensor

    DOE Patents [OSTI]

    Mosier, Bruce P. (San Francisco, CA); Crocker, Robert W. (Fremont, CA); Harnett, Cindy K. (Livermore, CA) l

    2004-01-13

    A device for measuring fluid flow rates over a wide range of flow rates (<1 nL/min to >10 .mu.L/min) and at pressures at least as great as 10,000 psi. The invention is particularly adapted for use in microfluidic systems. The device operates by producing compositional variations in the fluid, or pulses, that are subsequently detected downstream from the point of creation to derive a flow rate. Each pulse, comprising a small fluid volume, whose composition is different from the mean composition of the fluid, can be created by electrochemical means, such as by electrolysis of a solvent, electrolysis of a dissolved species, or electrodialysis of a dissolved ionic species. Measurements of the conductivity of the fluid can be used to detect the arrival time of the pulses, from which the fluid flow rate can be determined

  2. Plasma flow at a high Mach-number

    SciTech Connect (OSTI)

    Yu, Bing; Hameiri, Eliezer

    2013-09-15

    Unlike the case of static magnetohydrodynamic (MHD) equilibria, where an expansion in large aspect ratio of toroidal devices is common, cases of MHD equilibria with flow are rarely treated this way, and when this is done the expansion tends to be only partial. The main reason for the difference seems to be the difficulty of expanding the larger system of equilibrium equations with flow. Here, we use a recent expansion technique which employs a variational principle to simplify the process [E. Hameiri, Phys. Plasmas 20, 024504 (2013)]. We treat four cases of MHD equilibria with flow, developing their asymptotic expansions in full, and for an application consider the effect of the flow on the Shafranov shift.

  3. Query Plans for Conventional and Temporal Queries Involving Duplicates and Ordering

    E-Print Network [OSTI]

    Snodgrass, Richard T.

    substantially from built- in temporal support in the DBMS. To achieve this, temporal query representation for providing temporal support both via a stand-alone temporal DBMS and via a layer on top of a conventional DBMS. By capturing duplicate removal and retention and order preservation for all queries, as well

  4. Enviro Hurdles: Instream Flow | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Hurdles: Instream Flow Enviro Hurdles: Instream Flow Enviro Hurdles: Instream Flow 76enviornlbevelhimer4.pptx More Documents & Publications Instream Flow Project Development and...

  5. Flow Map Manager 

    E-Print Network [OSTI]

    Moya, Maria J

    2011-11-24

    Long-distance bus companies, operate services along routes which have a flow of passengers. Along a route some passengers will leave the bus while others join. To monitor demand sufficiently well a tool is required which can help estimate...

  6. Complex Flow Workshop Report

    SciTech Connect (OSTI)

    none,

    2012-05-01

    This report documents findings from a workshop on the impacts of complex wind flows in and out of wind turbine environments, the research needs, and the challenges of meteorological and engineering modeling at regional, wind plant, and wind turbine scales.

  7. Optical flow switching

    E-Print Network [OSTI]

    Chan, Vincent W. S.

    Present-day networks are being challenged by dramatic increases in bandwidth demand of emerging applications. We will explore a new transport, ldquooptical flow switchingrdquo, that will enable significant growth and ...

  8. Parallel flow diffusion battery

    DOE Patents [OSTI]

    Yeh, H.C.; Cheng, Y.S.

    1984-01-01

    A parallel flow diffusion battery for determining the mass distribution of an aerosol has a plurality of diffusion cells mounted in parallel to an aerosol stream, each diffusion cell including a stack of mesh wire screens of different density.

  9. Parallel flow diffusion battery

    DOE Patents [OSTI]

    Yeh, Hsu-Chi (Albuquerque, NM); Cheng, Yung-Sung (Albuquerque, NM)

    1984-08-07

    A parallel flow diffusion battery for determining the mass distribution of an aerosol has a plurality of diffusion cells mounted in parallel to an aerosol stream, each diffusion cell including a stack of mesh wire screens of different density.

  10. Single- and Two-Phase Diversion Cross-Flows Between Triangle Tight Lattice Rod Bundle Subchannels - Data on Flow Resistance and Interfacial Friction Coefficients for the Cross-Flow

    SciTech Connect (OSTI)

    Tatsuya Higuchi; Akimaro Kawahara; Michio Sadatomi; Hiroyuki Kudo [Kumamoto University, 39-1, Kurokami 2-chome, Kumamoto 860-8555 (Japan)

    2006-07-01

    Single- and two-phase diversion cross-flows arising from the pressure difference between tight lattice subchannels are our concern in this study. In order to obtain a correlation of the diversion cross-flow, we conducted adiabatic experiments using a vertical multiple-channel with two subchannels simplifying the triangle tight lattice rod bundle for air-water flows at room temperature and atmospheric pressure. In the experiments, data were obtained on the axial variations in the pressure difference between the subchannels, the ratio of flow rate in one subchannel to the whole channel, the void fraction in each subchannel for slug-churn and annular flows in two-phase flow case. These data were analyzed by use of a lateral momentum equation based on a two-fluid model to determine both the cross-flow resistance coefficient between liquid phase and channel wall and the gas-liquid interfacial friction coefficient. The resulting coefficients have been correlated in a way similar to that developed for square lattice subchannel case by Kano et al. (2002); the cross-flow resistance coefficient data can be well correlated with a ratio of the lateral velocity due to the cross-flow to the axial one irrespective of single- and two-phase flows; the interfacial friction coefficient data were well correlated with a Reynolds number, which is based on the relative velocity between gas and liquid cross-flows as the characteristic velocity. (authors)

  11. Electrochemical flow capacitors

    DOE Patents [OSTI]

    Gogotsi, Yury; Presser, Volker; Kumbar, Emin Caglan

    2015-11-05

    The present invention generally relates to devices for energy storage technologies, and more particularly to electrochemical flow capacitor systems and applications. In some aspects, these flow capacitors have at least one electrode comprising a non-stationary solid or semi-solid composition comprising supercapacitive particles and an electrolytic solvent in electrical communication with at least one current collector, and energy is stored and/or released by charging and/or discharging the electrode(s).

  12. Electrochemical flow capacitors

    DOE Patents [OSTI]

    Gogotsi, Yury; Presser, Volker; Kumbur, Emin Caglan

    2015-10-27

    The present invention generally relates to devices for energy storage technologies, and more particularly to electrochemical flow capacitor systems and applications. In some aspects, these flow capacitors have at least one electrode comprising a non-stationary solid or semi-solid composition comprising supercapacitive particles and an electrolytic solvent in electrical communication with at least one current collector, and energy is stored and/or released by charging and/or discharging the electrode(s).

  13. Mechanical Systems with Symmetry, Variational Principles,

    E-Print Network [OSTI]

    Marsden, Jerrold

    Mechanical Systems with Symmetry, Variational Principles, and Integration Algorithms Jerrold E@cds.caltech.edu and Jeffrey M. Wendlandt Mechanical Engineering University of California at Berkeley Berkeley, CA 94720 wents. Birkh¨auser, 1997, 219­261. Abstract This paper studies variational principles for mechanical systems

  14. A Fitting Robot for Variational Analysis

    E-Print Network [OSTI]

    Alan Ó Cais; Derek Leinweber; Selim Mahbub; Tony Williams

    2008-12-18

    We develop a robot algorithm to maximise the number of distinct states reliably extracted from correlator data using the variational analysis method. The robot explores the variational parameter space and attempts to remove, as far as possible, the human element from the fitting of the subsequent orthogonalised data.

  15. Developmental Variation in Ecogeographic Body Proportions

    E-Print Network [OSTI]

    Auerbach, Benjamin M.

    Developmental Variation in Ecogeographic Body Proportions Libby W. Cowgill,1 * Courtney D. Eleazer; Bergmann's and Allen's rule; body proportions ABSTRACT While ecogeographic variation in adult human body proportions has been extensively explored, relatively less attention has been paid to the effect of Bergmann

  16. Conjugate flow action functionals

    E-Print Network [OSTI]

    Daniele Venturi

    2013-10-15

    We present a new general method to construct an action functional for a non-potential field theory. The key idea relies on representing the governing equations of the theory relative to a diffeomorphic flow of curvilinear coordinates which is assumed to be functionally dependent on the solution field. Such flow, which will be called the conjugate flow of the theory, evolves in space and time similarly to a physical fluid flow of classical mechanics and it can be selected in order to symmetrize the Gateaux derivative of the field equations with respect to suitable local bilinear forms. This is equivalent to requiring that the governing equations of the field theory can be derived from a principle of stationary action on a Lie group manifold. By using a general operator framework, we obtain the determining equations of such manifold and the corresponding conjugate flow action functional. In particular, we study scalar and vector field theories governed by second-order nonlinear partial differential equations. The identification of transformation groups leaving the conjugate flow action functional invariant could lead to the discovery of new conservation laws in fluid dynamics and other disciplines.

  17. Systems for controlling the intensity variations in a laser beam and for frequency conversion thereof

    DOE Patents [OSTI]

    Skupsky, S.; Craxton, R.S.; Soures, J.

    1990-10-02

    In order to control the intensity of a laser beam so that its intensity varies uniformly and provides uniform illumination of a target, such as a laser fusion target, a broad bandwidth laser pulse is spectrally dispersed spatially so that the frequency components thereof are spread apart. A disperser (grating) provides an output beam which varies spatially in wavelength in at least one direction transverse to the direction of propagation of the beam. Temporal spread (time delay) across the beam is corrected by using a phase delay device (a time delay compensation echelon). The dispersed beam may be amplified with laser amplifiers and frequency converted (doubled, tripled or quadrupled in frequency) with nonlinear optical elements (birefringent crystals). The spectral variation across the beam is compensated by varying the angle of incidence on one of the crystals with respect to the crystal optical axis utilizing a lens which diverges the beam. Another lens after the frequency converter may be used to recollimate the beam. The frequency converted beam is recombined so that portions of different frequency interfere and, unlike interference between waves of the same wavelength, there results an intensity pattern with rapid temporal oscillations which average out rapidly in time thereby producing uniform illumination on target. A distributed phase plate (also known as a random phase mask), through which the spectrally dispersed beam is passed and then focused on a target, is used to provide the interference pattern which becomes nearly modulation free and uniform in intensity in the direction of the spectral variation. 16 figs.

  18. Fluid Flow Estimation Through Integration of Physical Flow Configurations

    E-Print Network [OSTI]

    Garbe, Christoph S.

    Fluid Flow Estimation Through Integration of Physical Flow Configurations Christoph S. Garbe IWR, University of Heidelberg Christoph.Garbe@iwr.uni-heidelberg.de Abstract. The measurement of fluid flows is an emerging field for op- tical flow computation. In a number of such applications, a tracer is visualized

  19. Air-flow regulation system for a coal gasifier

    DOE Patents [OSTI]

    Fasching, George E. (Morgantown, WV)

    1984-01-01

    An improved air-flow regulator for a fixed-bed coal gasifier is provided which allows close air-flow regulation from a compressor source even though the pressure variations are too rapid for a single primary control loop to respond. The improved system includes a primary controller to control a valve in the main (large) air supply line to regulate large slow changes in flow. A secondary controller is used to control a smaller, faster acting valve in a secondary (small) air supply line parallel to the main line valve to regulate rapid cyclic deviations in air flow. A low-pass filter with a time constant of from 20 to 50 seconds couples the output of the secondary controller to the input of the primary controller so that the primary controller only responds to slow changes in the air-flow rate, the faster, cyclic deviations in flow rate sensed and corrected by the secondary controller loop do not reach the primary controller due to the high frequency rejection provided by the filter. This control arrangement provides at least a factor of 5 improvement in air-flow regulation for a coal gasifier in which air is supplied by a reciprocating compressor through a surge tank.

  20. Studies of vertical annular gas-liquid flows

    SciTech Connect (OSTI)

    Zabaras, G.J.

    1985-01-01

    Three types of vertical flowing films were studied. These are the free falling film, the falling film in the presence of countercurrent gas flow, and the upward moving film due to concurrent flow of gas. An experimental program was performed based on a new electrochemical method for the dynamic measurement of the magnitude and the direction of the wall shear stress, and on a conductance wire probe for the simultaneous measurement of the film thickness. Pressure drop was measured over a short distance with a differential pressure transducer. The data obtained for the free falling film reveal a strong length effect on the wavy-film structure. The measured variation of the wall shear stress along a wave suggests that a mixing vortex exists in the wave front followed by the development of a hydrodynamic boundary layer in the wave back. Analysis of the data taken with counter current flow of gas shows that even at the flooding condition, the film flow is controlled by downward wave motion. Measured wall shear stress was found to be upward directed and decreasing in magnitude with increasing gas rate. Analyses of the upward film flow data in a variety of ways suggest that, at low gas rates, the motion of the interface is controlled by a process of switching between possible steady states of the system. This condition is usually designated as churn flow but bridging of the liquid across the pipe as associated with churning does not occur.

  1. Classical Propagation of Light in Spatio-Temporal Periodic Media

    E-Print Network [OSTI]

    Alexandrov, B S; Findikoglu, A T; Bishop, A R; Kostadinov, I Z

    2006-01-01

    We analyze the propagation of electromagnetic waves in media where the dielectric constants undergo rapid temporal periodic modulation. Both spatially homogeneous and periodic media are studied. Fast periodic temporal modulation of the dielectric constant of a homogeneous medium leads to existence of photonic band-gap like phenomena. In the presence of both spatial and tem- poral periodicity the electromagnetic spectrum is described in a four-dimensional cube, defining an effective Brillouin zone. In the case of incommensurability between space and time periodicities, completely dispersed point spectra exist.

  2. Photon temporal modes: a complete framework for quantum information science

    E-Print Network [OSTI]

    B. Brecht; Dileep V. Reddy; C. Silberhorn; M. G. Raymer

    2015-07-30

    Field-orthogonal temporal modes of photonic quantum states provide a new framework for quantum information science (QIS). They intrinsically span a high-dimensional Hilbert space and lend themselves to integration into existing single-mode fiber communication networks. We show that the three main requirements to construct a valid framework for QIS -- the controlled generation of resource states, the targeted and highly efficient manipulation of temporal modes and their efficient detection -- can be fulfilled with current technology. We suggest implementations of diverse QIS applications based on this complete set of building blocks.

  3. Energy Flow Energy Flow Energy Flow A.Ukleja, T.Tymieniecka, I.Skillicorn 1 Azimuthal asymmetry

    E-Print Network [OSTI]

    Energy Flow Energy Flow Energy Flow A.Ukleja, T.Tymieniecka, I.Skillicorn 1 Azimuthal asymmetry using energy flow method Azimuthal angle distribution at Q2 >100 GeV2 Energy flow method.Ukleja on behalf of the ZEUS Collaboration #12; Energy Flow Energy Flow Energy Flow A.Ukleja, T.Tymieniecka, I

  4. Systematic characterization of degas-driven flow for poly(dimethylsiloxane) microfluidic devices

    SciTech Connect (OSTI)

    Liang, David Y. [Univ. of California, Berkeley, CA (United States) Biomolecular Nanotechnology Center, Berkeley Sensor and Actuator Center; Tentori, Augusto M. [Univ. of California, Berkeley, CA (United States) Biomolecular Nanotechnology Center, Berkeley Sensor and Actuator Center; Dimov, Ivan K. [Univ. of California, Berkeley, CA (United States) Biomolecular Nanotechnology Center, Berkeley Sensor and Actuator Center; Univ. de Valapariso, Valapariso (Chile); Lee, Luke P. [Univ. of California, Berkeley, CA (United States) Biomolecular Nanotechnology Center, Berkeley Sensor and Actuator Center

    2011-01-01

    Degas-driven flow is a novel phenomenon used to propel fluids in poly(dimethylsiloxane) (PDMS)-based microfluidic devices without requiring any external power. This method takes advantage of the inherently high porosity and air solubility of PDMS by removing air molecules from the bulk PDMS before initiating the flow. The dynamics of degas-driven flow are dependent on the channel and device geometries and are highly sensitive to temporal parameters. These dependencies have not been fully characterized, hindering broad use of degas-driven flow as a microfluidic pumping mechanism. Here, we characterize, for the first time, the effect of various parameters on the dynamics of degas-driven flow, including channel geometry, PDMS thickness, PDMS exposure area, vacuum degassing time, and idle time at atmospheric pressure before loading. We investigate the effect of these parameters on flow velocity as well as channel fill time for the degas-driven flow process. Using our devices, we achieved reproducible flow with a standard deviation of less than 8% for flow velocity, as well as maximum flow rates of up to 3 nL/s and mean flow rates of approximately 1-1.5 nL/s. Parameters such as channel surface area and PDMS chip exposure area were found to have negligible impact on degas-driven flow dynamics, whereas channel cross-sectional area, degas time, PDMS thickness, and idle time were found to have a larger impact. In addition, we develop a physical model that can predict mean flow velocities within 6% of experimental values and can be used as a tool for future design of PDMS-based microfluidic devices that utilize degas-driven flow.

  5. Systematic characterization of degas-driven flow for poly(dimethylsiloxane) microfluidic devices

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Lee, Luke P.; Liang, David Y.; Tentori, Augusto M.; Dimov, Ivan K. [Universidad de Valparaiso (Chile)

    2011-06-02

    Degas-driven flow is a novel phenomenon used to propel fluids in poly(dimethylsiloxane) (PDMS)-based microfluidic devices without requiring any external power. This method takes advantage of the inherently high porosity and air solubility of PDMS by removing air molecules from the bulk PDMS before initiating the flow. The dynamics of degas-driven flow are dependent on the channel and device geometries and are highly sensitive to temporal parameters. These dependencies have not been fully characterized, hindering broad use of degas-driven flow as a microfluidic pumping mechanism. Here, we characterize, for the first time, the effect of various parameters on the dynamics of degas-driven flow, including channel geometry, PDMS thickness, PDMS exposure area, vacuum degassing time, and idle time at atmospheric pressure before loading. We investigate the effect of these parameters on flow velocity as well as channel fill time for the degas-driven flow process. Using our devices, we achieved reproducible flow with a standard deviation of less than 8% for flow velocity, as well as maximum flow rates of up to 3 nL/s and mean flow rates of approximately 1-1.5 nL/s. Parameters such as channel surface area and PDMS chip exposure area were found to have negligible impact on degas-driven flow dynamics, whereas channel cross-sectional area, degas time, PDMS thickness, and idle time were found to have a larger impact. In addition, we develop a physical model that can predict mean flow velocities within 6% of experimental values and can be used as a tool for future design of PDMS-based microfluidic devices that utilize degas-driven flow.

  6. Systematic characterization of degas-driven flow for poly(dimethylsiloxane) microfluidic devices

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Liang, David Y.; Tentori, Augusto M.; Dimov, Ivan K.; Lee, Luke P.

    2011-01-01

    Degas-driven flow is a novel phenomenon used to propel fluids in poly(dimethylsiloxane) (PDMS)-based microfluidic devices without requiring any external power. This method takes advantage of the inherently high porosity and air solubility of PDMS by removing air molecules from the bulk PDMS before initiating the flow. The dynamics of degas-driven flow are dependent on the channel and device geometries and are highly sensitive to temporal parameters. These dependencies have not been fully characterized, hindering broad use of degas-driven flow as a microfluidic pumping mechanism. Here, we characterize, for the first time, the effect of various parameters on the dynamics ofmore »degas-driven flow, including channel geometry, PDMS thickness, PDMS exposure area, vacuum degassing time, and idle time at atmospheric pressure before loading. We investigate the effect of these parameters on flow velocity as well as channel fill time for the degas-driven flow process. Using our devices, we achieved reproducible flow with a standard deviation of less than 8% for flow velocity, as well as maximum flow rates of up to 3 nL/s and mean flow rates of approximately 1-1.5 nL/s. Parameters such as channel surface area and PDMS chip exposure area were found to have negligible impact on degas-driven flow dynamics, whereas channel cross-sectional area, degas time, PDMS thickness, and idle time were found to have a larger impact. In addition, we develop a physical model that can predict mean flow velocities within 6% of experimental values and can be used as a tool for future design of PDMS-based microfluidic devices that utilize degas-driven flow.« less

  7. Flow Batteries A Historical Perspective

    E-Print Network [OSTI]

    Flow Batteries A Historical Perspective Robert F. Savinell Case Western Reserve University Department of Chemical Engineering DOE Flow Battery Workshop March 2012 #12;2 OUTLINE ·The first flow cell? ·Review articles- documented progress ·Early NASA Work- some learning ·Fuel Cell and Flow Battery

  8. Two-phase flow studies

    SciTech Connect (OSTI)

    Hanold, R.J.

    1983-12-01

    The two-phase flow program is directed at understanding the hydrodynamics of two-phase flows. The two-phase flow regime is characterized by a series of flow patterns that are designated as bubble, slug, churn, and annular flow. Churn flow has received very little scientific attention. This lack of attention cannot be justified because calculations predict that the churn flow pattern will exist over a substantial portion of the two-phase flow zone in producing geothermal wells. The University of Houston is experimentally investigating the dynamics of churn flow and is measuring the holdup over the full range of flow space for which churn flow exists. These experiments are being conducted in an air/water vertical two-phase flow loop. Brown University has constructed and is operating a unique two-phase flow research facility specifically designed to address flow problems of relevance to the geothermal industry. An important feature of the facility is that it is dedicated to two-phase flow of a single substance (including evaporation and condensation) as opposed to the case of a two-component two-phase flow. This facility can be operated with horizontal or vertical test sections of constant diameter or with step changes in diameter to simulate a geothermal well profile.

  9. Short-term Variations in the Galactic Environment of the Sun

    E-Print Network [OSTI]

    Priscilla C. Frisch; Jonathan D. Slavin

    2006-01-17

    The galactic environment of the Sun varies over short timescales as the Sun and interstellar clouds travel through space. Small variations in the dynamics, ionization, density, and magnetic field strength of the interstellar medium (ISM) surrounding the Sun yield pronounced changes in the heliosphere. We discuss essential information required to understand short-term variations in the galactic environment of the Sun, including the distribution and radiative transfer properties of nearby ISM, and variations in the boundary conditions of the heliosphere as the Sun traverses clouds. The most predictable transitions are when the Sun emerged from the Local Bubble interior and entered the cluster of local interstellar clouds flowing past the Sun, within the past 140,000 years, and again when the Sun entered the local interstellar cloud now surrounding and inside of the solar system, sometime during the past 44,000 years.

  10. Micro-scale mass-transfer variations during electrodeposition

    SciTech Connect (OSTI)

    Sutija, D.P.

    1991-08-01

    Results of two studies on micro-scale mass-transfer enhancement are reported: (1) Profiled cross-sections of striated zinc surfaces deposited in laminar channel flow were analyzed with fast-fourier transforms (FFT) to determine preferred striation wavelengths. Striation frequency increases with current density until a minimum separation between striae of 150 {mu}m is reached. Beyond this point, independent of substrate used, striae meld together and form a relatively smooth, nodular deposit. Substrates equipped with artificial micron-sized protrusions result in significantly different macro-morphology in zinc deposits. Micro-patterned electrodes (MPE) with hemispherical protrusions 5 {mu}m in diameter yield thin zinc striae at current densities that ordinarily produce random nodular deposits. MPEs with artificial hemi-cylinders, 2.5 {mu}m in height and spaced 250 {mu}m apart, form striae with a period which matches the spacing of micron-sized ridges. (2) A novel, corrosion-resistant micromosaic electrode was fabricated on a silicon wafer. Measurements of mass-transport enhancement to a vertical micromosaic electrode caused by parallel bubble streams rising inside of the diffusion boundary-layer demonstrated the presence of two co-temporal enhancement mechanisms: surface-renewal increases the limiting current within five bubble diameters of the rising column, while bubble-induced laminar flows cause weaker enhancement over a much broader swath. The enhancement caused by bubble curtains is predicted accurately by linear superposition of single-column enhancements. Two columns of smaller H{sub 2} bubbles generated at the same volumetric rate as a single column of larger bubbles cause higher peak and far-field enhancements. 168 refs., 96 figs., 6 tabs.

  11. Piezoelectric axial flow microvalve

    DOE Patents [OSTI]

    Gemmen, Randall; Thornton, Jimmy; Vipperman, Jeffrey S.; Clark, William W.

    2007-01-09

    This invention is directed to a fuel cell operable with a quantity of fuel and a quantity of an oxidizer to produce electrical power, the fuel cell including a fuel cell body including a labyrinth system structured to permit the fuel and the oxidizer to flow therethrough; at least a first catalyst in fluid communication with the labyrinth; and at least a first microvalve operably disposed within at least a portion of the labyrinth. The microvalve utilizes a deflectable member operable upon the application of a voltage from a voltage source. The microvalve includes an elongated flow channel formed therein and extending substantially longitudinally between the first and second ends to permit substantially longitudinal flow of the fluid therethrough and between the first and second ends; and the deflectable member disposed on the valve body, the deflectable member including at least a first piezoelectric portion that is piezoelectrically operable to deflect the deflectable member between an open position and a closed position upon the application of a voltage, the deflectable member in the closed position being operable to resist the flow of the fluid through the flow channel.

  12. NO TRANSIT TIMING VARIATIONS IN WASP-4

    SciTech Connect (OSTI)

    Petrucci, R.; Schwartz, M.; Buccino, A. P.; Mauas, P. J. D.; Jofré, E.; Cúneo, V.; Gómez, M.; Martínez, C.

    2013-12-20

    We present six new transits of the system WASP-4. Together with 28 light curves published in the literature, we perform a homogeneous study of its parameters and search for variations in the transits' central times. The final values agree with those previously reported, except for a slightly lower inclination. We find no significant long-term variations in i or R{sub P} /R {sub *}. The O-C mid-transit times do not show signs of transit timing variations greater than 54 s.

  13. Accounting for population variation in targeted proteomics

    SciTech Connect (OSTI)

    Fujimoto, Grant M.; Monroe, Matthew E.; Rodriguez, Larissa M.; Wu, Chaochao; MacLean, Brendan; Smith, Richard D.; MacCoss, Michael; Payne, Samuel H.

    2014-01-03

    Individual proteomes typically differ from the reference human proteome at ~10,000 single amino acid variants. When viewed at the population scale, this individual variation results in a wide variety of protein sequences. In targeted proteomics experiments, such variability would confound accurate protein quantification. To facilitate researchers in identifying target peptides with high variability within the human population we have created the Population Variation plug-in for Skyline, which provides easy access to the polymorphisms stored in dbSNP. Given a set of peptides, the tool reports minor allele frequency for common polymorphisms. We highlight the importance of considering genetic variation by applying the tool to public datasets.

  14. Assessment of Controlling Processes for Field-Scale Uranium Reactive Transport under Highly Transient Flow Conditions

    SciTech Connect (OSTI)

    Ma, Rui; Zheng, Chunmiao; Liu, Chongxuan; Greskowiak, Janek; Prommer, Henning; Zachara, John M.

    2014-02-13

    This paper presents the results of a comprehensive model-based analysis of a uranium tracer test conducted at the U.S Department of Energy Hanford 300 Area (300A) IFRC site. A three-dimensional multi-component reactive transport model was employed to assess the key factors and processes that control the field-scale uranium reactive transport. Taking into consideration of relevant physical and chemical processes, the selected conceptual/numerical model replicates the spatial and temporal variations of the observed U(VI) concentrations reasonably well in spite of the highly complex field conditions. A sensitivity analysis was performed to interrogate the relative importance of various processes and factors for reactive transport of U(VI) at the field-scale. The results indicate that multi-rate U(VI) sorption/desorption, U(VI) surface complexation reactions, and initial U(VI) concentrations were the most important processes and factors controlling U(VI) migration. On the other hand, cation exchange reactions, the choice of the surface complexation model, and dual-domain mass transfer processes, which were previously identified to be important in laboratory experiments, played less important roles under the field-scale experimental condition at the 300A site. However, the model simulations also revealed that the groundwater chemistry was relatively stable during the uranium tracer experiment and therefore presumably not dynamic enough to appropriately assess the effects of ion exchange reaction and the choice of surface complexation models on U(VI) sorption and desorption. Furthermore, it also showed that the field experimental duration (16 days) was not sufficiently long to precisely assess the role of a majority of the sorption sites that were accessed by slow kinetic processes within the dual domain model. The sensitivity analysis revealed the crucial role of the intraborehole flow that occurred within the long-screened monitoring wells and thus significantly affected both field-scale measurements and simulated U(VI) concentrations as a combined effect of aquifer heterogeneity and highly dynamic flow conditions. Overall, this study, which provides one of the few detailed and highly data-constrained uranium transport simulations, highlights the difference in controlling processes between laboratory and field scale that prevent a simple direct upscaling of laboratory-scale models.

  15. Multiphase cooling flows

    E-Print Network [OSTI]

    Peter A. Thomas

    1996-08-20

    I discuss the multiphase nature of the intracluster medium whose neglect can lead to overestimates of the baryon fraction of clusters by up to a factor of two. The multiphase form of the cooling flow equations are derived and reduced to a simple form for a wide class of self-similar density distributions. It is shown that steady-state cooling flows are \\emph{not} consistent with all possible emissivity profiles which can therefore be used as a test of the theory. In combination, they provide strong constraints on the mass distribution within the cooling radius.

  16. Variable Refrigerant Flow HVAC 

    E-Print Network [OSTI]

    Jones, S.

    2013-01-01

    Variable refrigerant flow technology HVAC CATEE 2013 San Antonio, TX ESL-KT-13-12-33 CATEE 2013: Clean Air Through Energy Efficiency Conference, San Antonio, Texas Dec. 16-18 What is the acronym VRF? ? Variable Refrigerant Flow Operates like a... heat pump utilizing VFD Inverter Compressors and LEV’s Unlike conventional commercial and residential HVAC systems in the USA The predominate method of cooling and heating in the world ESL-KT-13-12-33 CATEE 2013: Clean Air Through Energy Efficiency...

  17. Temporal Information Extraction Xiao Ling and Daniel S. Weld

    E-Print Network [OSTI]

    Temporal Information Extraction Xiao Ling and Daniel S. Weld Department of Computer Science and Engineering University of Washington Seattle, WA 98195-2350, U.S.A. {xiaoling, weld- supervised probabilistic sequential models (Banko et al. 2007; Wu and Weld 2007), and numerous other ap

  18. TEMPORAL PERFORMANCE EVALUATION OF CONTROL ARCHITECTURE IN AUTOMATION

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    TEMPORAL PERFORMANCE EVALUATION OF CONTROL ARCHITECTURE IN AUTOMATION SYSTEMS Pascal Meunier, Bruno, France pascal.meunier@lurpa.ens-cachan.fr (Pascal Meunier) Abstract The performances of automation are the merger of a hardware structure ­ industrial computers and logic controllers connected to networks

  19. A Spatio-Temporal Point Process Model for Ambulance Demand

    E-Print Network [OSTI]

    Woodard, Dawn B.

    (EMS) managers need accurate demand estimates to mini- mize response times to emergencies and keep. Several studies have modeled aggregate ambulance demand as a temporal process. Channouf et al. (2007) use by combining a dynamic latent factor structure with integer time series models. Other aggregate demand studies

  20. Incorporating Temporal Reasoning into Activity Recognition for Smart Home Residents

    E-Print Network [OSTI]

    Cook, Diane J.

    Incorporating Temporal Reasoning into Activity Recognition for Smart Home Residents Geetika Singla be employed for valuable functions such as at- home health monitoring. In this project, we are using smart-2752 {gsingla, djcook, schmitter-e}@wsu.edu Abstract Smart environments rely on artificial intelligence

  1. On the Expressive Power of Temporal Concurrent Constraint Programming Languages

    E-Print Network [OSTI]

    Valencia, Frank D.

    On the Expressive Power of Temporal Concurrent Constraint Programming Languages Mogens Nielsen behavior have been proposed in the literature. In this paper we study the expressive power of some programming, timed systems, expressiveness The contribution of Mogens Nielsen and Frank D. Valen- cia

  2. MOBILE PHONE USE AND TEMPORAL SKIN HEAT SENSATION

    E-Print Network [OSTI]

    Boyer, Edmond

    in the phone by the battery currents and running of the radiofrequency (RF) electronic circuits measured the temperature of the temporal skin due to GSM 1800 MHz MP radiated power (125 mW). We suppressed of the heat produced in the phone by the battery currents and running of the radiofrequency (RF) electronic

  3. Does blending of chlorophyll data bias temporal trend?

    E-Print Network [OSTI]

    Myers, Ransom A.

    Does blending of chlorophyll data bias temporal trend? ARISING FROM D. G. Boyce, M. R. Lewis & B of the bias component. To obtain a larger and longer data set, Boyce et al.1 pooled estimates of local, CT 5 457 D22.37 . Blending of data types can introduce error unless their expected values E(CT) and E

  4. Temporal Index Sharding for Space-Time Efficiency

    E-Print Network [OSTI]

    Waldmann, Uwe

    each index list with almost zero increase in index size but still minimizes the cost of reading indexTemporal Index Sharding for Space-Time Efficiency in Archive Search Avishek Anand Srikanta Bedathur involve slicing either the entire collection [19] or individual index lists [9] along the time-axis. Both

  5. Spatio-Temporal Signal Recovery from Political Tweets in Indonesia

    E-Print Network [OSTI]

    Davulcu, Hasan

    Spatio-Temporal Signal Recovery from Political Tweets in Indonesia Anisha Mazumder, Arun Das activity in the provinces of Indonesia. Based on analysis of radical/counter radical sentiments expressed in tweets by Twitter users, we create a Heat Map of Indonesia which visually demonstrates the degree

  6. Using Temporal Logics to Express Search Control Knowledge for Planning

    E-Print Network [OSTI]

    Kabanza, Froduald

    of hierarchical task network (HTN) planners have been stud- ied in the literature and utilized in planning systemsUsing Temporal Logics to Express Search Control Knowledge for Planning Fahiem Bacchus Dept kabanza@dmi.usherb.ca June 7, 1999 Abstract Over the years increasingly sophisticated planning algorithms

  7. Temporal Conditions and Integrity Constraints in Active Database Systems \\Lambda

    E-Print Network [OSTI]

    Wolfson, Ouri E.

    to specify conditions that involve both, events and database states, and their evolution over time. BasicallyTemporal Conditions and Integrity Constraints in Active Database Systems \\Lambda A. Prasad Sistla, for specifying conditions and events in the rules for active database sys­ tem. This language permits

  8. The GLIMS Glacier Database: a spatio-temporal database

    E-Print Network [OSTI]

    Raup, Bruce H.

    The GLIMS Glacier Database: a spatio-temporal database implemented using Open Source tools Bruce countries #12;#12;#12;#12;#12;System components PostgreSQL (relational database) PostGIS (geospatial) GDAL (Geospatial Data Abstraction Library) Perl, PHP, Shapelib, ... #12;GLIMS Glacier Database System

  9. Football analysis using spatio-temporal tools Joachim Gudmundsson

    E-Print Network [OSTI]

    Wolle, Thomas

    Football analysis using spatio-temporal tools Joachim Gudmundsson University of Sydney and NICTA, Australia thomas.wolle@gmail.com ABSTRACT Analysing a football match is without doubt an important task specifically for analysing the performance of football players and teams. The aim, functionality

  10. Spatio-Temporal Credit Assignment in Neuronal Population Learning

    E-Print Network [OSTI]

    Senn, Walter

    provides a viable mechanism for temporal credit assignment. Further, learning speeds up with increasing). The funders had no role in study design, data collection and analysis, decision to publish, or preparation they are adaptive, synapses may be viewed as the elementary decision making entities in the brain

  11. Scaling Behavior in the Temporal Context Model Marc W. Howard

    E-Print Network [OSTI]

    Howard, Marc

    Scaling Behavior in the Temporal Context Model Marc W. Howard Department of Psychology Syracuse numerous helpful comments on an earlier draft. Supported by 2-RO1 MH55687. Corre- spondence to Marc Howard, Syracuse University, Department of Psychology, 430 Huntington Hall, Syracuse, NY 13244-2340, or marc

  12. JournalofCellScience ERK and phosphoinositide 3-kinase temporally

    E-Print Network [OSTI]

    Amaya, Enrique

    JournalofCellScience ERK and phosphoinositide 3-kinase temporally coordinate different modes and distinct downstream targets. The sequential activation of ERK and phosphoinositide 3-kinase (PI3K) signalling divides Xenopus embryonic wound healing into two phases. In the first phase, activated ERK

  13. University of Alberta Gradient Temporal-Difference Learning Algorithms

    E-Print Network [OSTI]

    Sutton, Richard S.

    University of Alberta Gradient Temporal-Difference Learning Algorithms by Hamid Reza Maei A thesis, Alberta Permission is hereby granted to the University of Alberta Libraries to reproduce single copies the thesis is converted to, or otherwise made available in digital form, the University of Alberta

  14. Temporal coupled-mode theory for resonant Lieven Verslegers,1,

    E-Print Network [OSTI]

    Fan, Shanhui

    are concepts that are fundamentally important for character- izing electromagnetic properties of individualTemporal coupled-mode theory for resonant apertures Lieven Verslegers,1, * Zongfu Yu,1 Peter B 9, 2010 We develop the coupled-mode theory for nanoscale resonant apertures. We show

  15. Multivariate Receptor Modeling for Temporally Correlated Data by Using MCMC

    E-Print Network [OSTI]

    Washington at Seattle, University of

    Multivariate Receptor Modeling for Temporally Correlated Data by Using MCMC Eun Sug Park Peter Protection Agency which provides the Center's primary funding. #12;Multivariate Receptor Modeling Multivariate receptor modeling aims to estimate pollution source profiles and the amounts of pollution based

  16. A Case Study of Temporal Data By Richard T. Snodgrass,

    E-Print Network [OSTI]

    Snodgrass, Richard T.

    determine when the erroneous data were stored (a transaction time), rollback the table to that point of the table, with all the data directly at hand. The alternatives ­ going back through paper recordsA Case Study of Temporal Data By Richard T. Snodgrass, Professor of Computer Science, University

  17. Circuit Area Optimization in Energy Temporal Sparse Scenarios for

    E-Print Network [OSTI]

    Politècnica de Catalunya, Universitat

    Circuit Area Optimization in Energy Temporal Sparse Scenarios for Multiple Harvester Powered.alarcon@upc.edu Abstract--Multi-source energy harvesters are gaining interest as a robust alternative to power wireless sensors, since the sensor node can maintain its operation regardless of the fact that one of its energy

  18. A Temporal Threshold for Formaldehyde Crosslinking and Fixation

    E-Print Network [OSTI]

    MacDonald, Andrew

    A Temporal Threshold for Formaldehyde Crosslinking and Fixation Lars Schmiedeberg. , Pete Skene, United Kingdom Abstract Background: Formaldehyde crosslinking is in widespread use as a biological in the microscope after formaldehyde fixation, though they are obvious in live cells. The stark contrast between

  19. University of Alberta Gradient Temporal-Difference Learning Algorithms

    E-Print Network [OSTI]

    Sutton, Richard S.

    of convergence--in on-policy problems. #12;Acknowledgements This PhD thesis is developed through collaboration;Abstract We present a new family of gradient temporal-difference (TD) learning methods with func- tion- proximation. In particular, convergence cannot be guaranteed for these methods when they are used with off-policy

  20. HOMOGENEOUS TEMPORAL ACTIVITY PATTERNS IN A LARGE ONLINE

    E-Print Network [OSTI]

    Gómez, Vicenç

    technology-news website Slashdot has been studied. We have concentrated on the dynamics of message production-mails, loan registers, credit card transactions, blogs, etc. This huge amount of generated data allows the temporal patterns of the many-to-many social interaction on a technology-related news-website which

  1. NEURAL CODING OF TEMPORAL INFORMATION IN AUDITORY THALAMUS AND CORTEX

    E-Print Network [OSTI]

    Wang, Xiaoqin

    to our understanding of mecha- nisms underlying speech processing. Time-varying signals are fundamental. LU,1 D. BENDOR1 AND E. BARTLETT1 Laboratory of Auditory Neurophysiology, Department of Biomedical 21205, USA Abstract--How the brain processes temporal information embedded in sounds is a core question

  2. Revista Electrnica Nova Scientia Propagacin temporal de algunas enfermedades

    E-Print Network [OSTI]

    Cipolatti, Rolci

    Revista Electrónica Nova Scientia Propagación temporal de algunas enfermedades bacterianas: un: a mathematical model Revista Electrónica Nova Scientia, Nº 8 Vol. 4 (2), 2012. ISSN 2007 - 0705. pp: 42 - 65 - 43;Cipolatti, R. et al. Revista Electrónica Nova Scientia, Nº 8 Vol. 4 (2), 2012. ISSN 2007 - 0705. pp: 42 ­ 65

  3. The Post Anachronism: The Temporal Dimension of Facebook Privacy

    E-Print Network [OSTI]

    Bauer, Lujo

    The Post Anachronism: The Temporal Dimension of Facebook Privacy Lujo Bauer , Lorrie Faith Cranor the audience and emphasis of Facebook posts change over time. In a 63-participant longitudinal study, par- ticipants gave their audience and emphasis preferences for up to ten of their Facebook posts in the week

  4. Ground surface temperatures in Canada: Spatial and temporal variability

    E-Print Network [OSTI]

    Long, Bernard

    show that the ground has warmed about 0.7 K in the last 100 years. Spatial variability is significant temperatures in Canada: Spatial and temporal variability, Geophys. Res. Lett., 30(10), 1499, doi:10.1029/2003GL inferred from geothermal data have shown that the study of perturbations to the Earth's energy balance

  5. Optimal Control with Weighted Average Costs and Temporal Logic Specifications

    E-Print Network [OSTI]

    Murray, Richard M.

    Optimal Control with Weighted Average Costs and Temporal Logic Specifications Eric M. Wolff Control and Dynamical Systems California Institute of Technology Pasadena, California 91125 Email: ewolff@caltech.edu Ufuk Topcu Control and Dynamical Systems California Institute of Technology Pasadena, California 91125

  6. Shaping Biphoton Temporal Waveforms with Modulated Classical Fields

    SciTech Connect (OSTI)

    Chen, J. F.; Zhang Shanchao; Yan Hui; Loy, M. M. T.; Wong, G. K. L.; Du Shengwang [Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon (Hong Kong)

    2010-05-07

    We experimentally demonstrate a technique for shaping the temporal quantum waveform of narrow-band biphotons generated in a cold atomic ensemble via four-wave mixing by periodically modulating the two input classical lasers. We show that it is possible to generate nonclassical paired photons with a predesigned shape of the correlation function.

  7. Precipitation event distribution in Central Argentina: spatial and temporal patterns

    E-Print Network [OSTI]

    Nacional de San Luis, Universidad

    Precipitation event distribution in Central Argentina: spatial and temporal patterns Patricio N, C1417DSE Buenos Aires, Argentina ABSTRACT The annual amount of precipitation inputs received, these inputs have to escape runoff, favoured by large and less frequent precipitation events, and evaporation

  8. Density variations and anomalies in palladium compacts

    SciTech Connect (OSTI)

    Back, D.; Jones, T.; Ransick, M.; Walburg, T.; Werkmeister, D.

    1992-05-14

    Low-density compacts of palladium powder have relative densities of about 30{plus minus}10% TD. The variations in density are of concern for operations such as chemical/hydrogen pump systems because heat, mass, and momentum transport properties can be affected. Variations in density result from the inherent nature and interacting forces of UASA compaction of powder in cylinders. In addition to these expected variations, discontinuous density anomalies, such as cracks or high density ridges, are also found. An anomaly of particular concern was found to resemble a steer's head.'' it is a symmetrical region of low density located at or near the center of a compact. Typically, this region is surrounded by a band of high density, compacted palladium that sometimes exceeds the density of the surrounding compact matrix by a factor of three. This report examines these density variations and anomalies both theoretically and empirically.

  9. Density variations and anomalies in palladium compacts

    SciTech Connect (OSTI)

    Back, D.; Jones, T.; Ransick, M.; Walburg, T.; Werkmeister, D.

    1992-05-14

    Low-density compacts of palladium powder have relative densities of about 30{plus_minus}10% TD. The variations in density are of concern for operations such as chemical/hydrogen pump systems because heat, mass, and momentum transport properties can be affected. Variations in density result from the inherent nature and interacting forces of UASA compaction of powder in cylinders. In addition to these expected variations, discontinuous density anomalies, such as cracks or high density ridges, are also found. An anomaly of particular concern was found to resemble a ``steer`s head.`` it is a symmetrical region of low density located at or near the center of a compact. Typically, this region is surrounded by a band of high density, compacted palladium that sometimes exceeds the density of the surrounding compact matrix by a factor of three. This report examines these density variations and anomalies both theoretically and empirically.

  10. Convergence Conditions for Variational Inequality Algorithms

    E-Print Network [OSTI]

    Magnanti, Thomas L.

    Within the extensive variational inequality literature, researchers have developed many algorithms. Depending upon the problem setting, these algorithms ensure the convergence of (i) the entire sequence of iterates, (ii) ...

  11. Predictive modeling of integrated circuit manufacturing variation

    E-Print Network [OSTI]

    Muddu, Swamy V.

    2007-01-01

    CD Variation in 65nm Node with PSM Processes STI TopographyIn sub-65nm technologies, PSM is a mainstream technique toDi?erent combination of OPC, PSM and OAI are used by

  12. Testing a method for modelling pronunciation variation

    E-Print Network [OSTI]

    Kessens, Judith M; Wester, Mirjam; Cucchiarini, Catia; Strik, Helmer

    1997-01-01

    In this paper we describe a method for improving the performance of a continuous speech recognizer by modelling pronunciation variation. Although the results obtained with this method are in line with those reported by ...

  13. Variational Asymptotic Micromechanics Modeling of Heterogeneous Piezoelectric

    E-Print Network [OSTI]

    Yu, Wenbin

    piezoelectric materials are usually a better technical solution in the case of many applications such 1Variational Asymptotic Micromechanics Modeling of Heterogeneous Piezoelectric Materials Tian Tang properties and local fields of heterogeneous piezoelectric materials using the vari- ational asymptotic

  14. On the Kalman Filter and Its Variations

    E-Print Network [OSTI]

    Lindsey, Theodore S.

    2014-05-31

    The objective of this paper is to explore the standard Kalman filter and two non-linear variations. Additionally, we will discuss the derivation of the Kalman filter using Newton's method. Next we will consider the implementation of both...

  15. Improving recognition performance by modelling pronunciation variation

    E-Print Network [OSTI]

    Kessens, Judith M; Wester, Mirjam

    1997-01-01

    This paper describes a method for improving the performance of a continuous speech recognizer by modelling pronunciation variation. Although the improvements obtained with this method are small, they are in line with those ...

  16. Managing Milk Composition: Normal Sources of Variation 

    E-Print Network [OSTI]

    Stokes, Sandra R.; Jordan, Ellen R.; Looper, Mike; Waldner, Dan

    2000-12-11

    Sources of Variation Sandra R. Stokes, Dan N. Waldner, Ellen R. Jordan, and Michael L. Looper* Many factors influence the composition of milk, the major components of which are water, fat, protein, lactose and minerals. Nutrition or dietary influences...

  17. Curved plate damper test and simulations with snubbers, through- flow, and flexible plate effects 

    E-Print Network [OSTI]

    Gadangi, Ravindra Kumar

    1992-01-01

    through- flow, implying that tbe exit orifice is closed during the dynamic excitation of the damper plate. The energy is dissipated by the viscous shear of the fluid and orifice pressure drop. Damping coefficient is estimated by using a least...) . 3. 2 Comparison of results (concentrated load at the center) 3. 3 Comparison of results(fluid element model) 3. 4 Comparison oi' flows 4. 1 EfFects of variation of inlet orifice diameter 4. 2 EfFects of variation of damper clearance 4. 3 Ef...

  18. Flow cytometry apparatus

    DOE Patents [OSTI]

    Pinkel, Daniel (Walnut Creek, CA)

    1991-01-01

    An obstruction across the flow chamber creates a one dimensional convergence of a sheath fluid. A passageway in the construction directs flat cells near to the area of one dimensional convergence in the sheath fluid to provide proper orientation of flat cells at fast rates.

  19. US energy flow, 1991

    SciTech Connect (OSTI)

    Borg, I.Y.; Briggs, C.K.

    1992-06-01

    Trends in energy consumption and assessment of energy sources are discussed. Specific topics discussed include: energy flow charts; comparison of energy use with 1990 and earlier years; supply and demand of fossil fuels (oils, natural gas, coal); electrical supply and demand; and nuclear power.

  20. Flow cytometry apparatus

    DOE Patents [OSTI]

    Pinkel, D.

    1987-11-30

    An obstruction across the flow chamber creates a one-dimensional convergence of a sheath fluid. A passageway in the obstruction directs flat cells near to the area of one-dimensional convergence in the sheath fluid to provide proper orientation of flat cells at fast rates. 6 figs.

  1. ENERGY FLOWS CLIMATE CHANGE

    E-Print Network [OSTI]

    Schwartz, Stephen E.

    ENERGY FLOWS FORCINGS CLIMATE CHANGE A REALLY TOUGH PROBLEM Stephen E. Schwartz, BNL, 7-20-11 www average temperature 15°C or 59°F #12;ATMOSPHERIC RADIATION Power per area Energy per time per area Unit" temperature to radiative flux. #12;GLOBAL ENERGY BALANCE Global and annual average energy fluxes in watts per

  2. Characterization of the reactive flow field dynamics in a gas turbine injector using high frequency PIV

    E-Print Network [OSTI]

    Barbosa, Séverine; Ducruix, Sébastien

    2008-01-01

    The present work details the analysis of the aerodynamics of an experimental swirl stabilized burner representative of gas turbine combustors. This analysis is carried out using High Frequency PIV (HFPIV) measurements in a reactive situation. While this information is usually available at a rather low rate, temporally resolved PIV measurements are necessary to better understand highly turbulent swirled flows, which are unsteady by nature. Thanks to recent technical improvements, a PIV system working at 12 kHz has been developed to study this experimental combustor flow field. Statistical quantities of the burner are first obtained and analyzed, and the measurement quality is checked, then a temporal analysis of the velocity field is carried out, indicating that large coherent structures periodically appear in the combustion chamber. The frequency of these structures is very close to the quarter wave mode of the chamber, giving a possible explanation for combustion instability coupling.

  3. Accounting for Variation of Diminutive Formation in Porteño Spanish

    E-Print Network [OSTI]

    Norrmann-Vigil, Ingrid

    2012-01-01

    the Real Proportion; thus, accounting for as much variationPredicted Proportion. Accounting for Variation of Diminutiveproportion of occurrence for every candidate; thus yielding a very significant account for the variation

  4. Modeling Pronunciation Variation for a Dutch CSR: Testing Three Methods 

    E-Print Network [OSTI]

    Wester, Mirjam; Kessens, Judith M; Strik, Helmer

    This paper describes how the performance of a continuous speech recognizer for Dutch has been improved by modeling pronunciation variation. We used three methods to model pronunciation variation. First, within-word variation ...

  5. Opposed-flow virtual cyclone for particle concentration

    DOE Patents [OSTI]

    Rader, Daniel J. (Lafayette, CA); Torczynski, John R. (Albuquerque, NM)

    2000-12-05

    An opposed-flow virtual cyclone for aerosol collation which can accurately collect, classify, and concentrate (enrich) particles in a specific size range. The opposed-flow virtual cyclone is a variation on the virtual cyclone and has its inherent advantages (no-impact particle separation in a simple geometry), while providing a more robust design for concentrating particles in a flow-through type system. The opposed-flow virtual cyclone consists of two geometrically similar virtual cyclones arranged such that their inlet jets are inwardly directed and symmetrically opposed relative to a plane of symmetry located between the two inlet slits. A top plate bounds both jets on the "top" side of the inlets, while the other or lower wall curves "down" and away from each inlet jet. Each inlet jet will follow the adjacent lower wall as it turns away, and that particles will be transferred away from the wall and towards the symmetry plane by centrifugal action. After turning, the two jets merge smoothly along the symmetry line and flow parallel to it through the throat. Particles are transferred from the main flows, across a dividing streamline, and into a central recirculating region, where particle concentrations become greatly increased relative to the main stream.

  6. Internal thermal coupling in direct-flow coaxial vacuum tube collectors

    SciTech Connect (OSTI)

    Glembin, J.; Rockendorf, G.; Scheuren, J.

    2010-07-15

    This investigation covers the impact of low flow rates on the efficiency of coaxial vacuum tube collectors. Measurements show an efficiency reduction of 10% if reducing the flow rate from 78 kg/m{sup 2} h to 31 kg/m{sup 2} h for a collector group with 60 parallel vacuum tubes with a coaxial flow conduit at one-sided connection. For a more profound understanding a model of the coaxial tube was developed which defines the main energy fluxes including the internal thermal coupling. The tube simulations show a non-linear temperature profile along the tube with the maximum temperature in the outer pipe. Due to heat transfer to the entering flow this maximum is not located at the fluid outlet. The non-linearity increases with decreasing flow rates. The experimentally determined flow distribution allows simulating the measured collector array. The simulation results confirm the efficiency decrease at low flow rates. The flow distribution has a further impact on efficiency reduction, but even at an ideal uniform flow, a considerable efficiency reduction at low flow rates is to be expected. As a consequence, low flow rates should be prevented for coaxial tube collectors, thus restricting the possible operation conditions. The effect of constructional modifications like diameter or material variations is presented. Finally the additional impact of a coaxial manifold design is discussed. (author)

  7. A Corticostriatal Neural System Enhances Auditory Perception through Temporal Context Processing

    E-Print Network [OSTI]

    Geiser, Eveline

    The temporal context of an acoustic signal can greatly influence its perception. The present study investigated the neural correlates underlying perceptual facilitation by regular temporal contexts in humans. Participants ...

  8. Undecidability and temporal logic: some landmarks from Turing to the present

    E-Print Network [OSTI]

    Goranko, Valentin

    . INTRODUCTION Temporal logic was born in the mid 1950s, right after the death of Alan Turing in temporal logic was essentially Alan Turing's celebrated Undecidability of the Halting problem of (what

  9. Classification and volumetric analysis of temporal bone pneumatization using cone beam computed tomography

    E-Print Network [OSTI]

    Terasaki, Mark

    Classification and volumetric analysis of temporal bone pneumatization using cone beam computed Objective. This study performed volumetric analysis and classified different repeated patterns of temporal. Volumetric analysis of the pneumatization was performed using a window thresholding procedure on multiplanar

  10. Quark mass variation constraints from Big Bang nucleosynthesis...

    Office of Scientific and Technical Information (OSTI)

    Quark mass variation constraints from Big Bang nucleosynthesis Citation Details In-Document Search Title: Quark mass variation constraints from Big Bang nucleosynthesis We study...

  11. Regional Variation in Residential Heat Pump Water Heater Performance...

    Energy Savers [EERE]

    Regional Variation in Residential Heat Pump Water Heater Performance in the United States Regional Variation in Residential Heat Pump Water Heater Performance in the United States...

  12. Accounting for Variation of Diminutive Formation in Porteño Spanish

    E-Print Network [OSTI]

    Norrmann-Vigil, Ingrid

    2012-01-01

    Accounting for Variation of Diminutive Formation in Porteñobase, the inclusion Accounting for Variation of Diminutiveas additive, thus accounting for cumulativity effects” (2).

  13. Applied Studies and Technology: The Third Dimension-Variation...

    Energy Savers [EERE]

    Applied Studies and Technology: The Third Dimension-Variation in Groundwater Aquifers Applied Studies and Technology: The Third Dimension-Variation in Groundwater Aquifers October...

  14. Weak Variations Optimal Boundary Control of Hyperbolic PDEs with Application to Traffic Flow and Delay Systems

    E-Print Network [OSTI]

    Moura, Scott J

    2012-01-01

    Stabilization of slugging in oil production facilities withchemical reactors, and oil production systems. We derivereactors [4], oil production systems [5], thermostat- ically

  15. Decadal scale variations in ice flow along Whillans Ice Stream and its tributaries, West Antarctica

    E-Print Network [OSTI]

    Stearns, Leigh; Jezek, Kenneth C.; van der Veen, Cornelis J.

    2005-01-05

    We investigate velocity changes occurring along Whillans Ice Stream (WIS) by comparing velocities derived from repeat aerial photographs acquired in 1985–89 (average date of 1987) to interferometric satellite radar (InSAR) ...

  16. Decadal-scale variations in ice flow along Whillans Ice Stream and its tributaries, West Antarctica

    E-Print Network [OSTI]

    Stearns, Leigh; Jezek, K.A.; van der Veen, Cornelis J.

    2005-01-01

    We investigate velocity changes occurring along Whillans Ice Stream (WIS) by comparing velocities derived from repeat aerial photographs acquired in 1985–89 (average date of 1987) to interferometric satellite radar (InSAR) ...

  17. The effect of laser pulse shape variations on the adiabat of NIF capsule implosions

    SciTech Connect (OSTI)

    Robey, H. F.; MacGowan, B. J.; Landen, O. L.; LaFortune, K. N.; Widmayer, C.; Celliers, P. M.; Moody, J. D.; Ross, J. S.; Ralph, J.; LePape, S.; Berzak Hopkins, L. F.; Spears, B. K.; Haan, S. W.; Clark, D.; Lindl, J. D.; Edwards, M. J. [LLNL, Livermore, California 94550 (United States)] [LLNL, Livermore, California 94550 (United States)

    2013-05-15

    Indirectly driven capsule implosions on the National Ignition Facility (NIF) [Moses et al., Phys. Plasmas 16, 041006 (2009)] are being performed with the goal of compressing a layer of cryogenic deuterium-tritium (DT) fuel to a sufficiently high areal density (?R) to sustain the self-propagating burn wave that is required for fusion power gain greater than unity. These implosions are driven with a temporally shaped laser pulse that is carefully tailored to keep the DT fuel on a low adiabat (ratio of fuel pressure to the Fermi degenerate pressure). In this report, the impact of variations in the laser pulse shape (both intentionally and unintentionally imposed) on the in-flight implosion adiabat is examined by comparing the measured shot-to-shot variations in ?R from a large ensemble of DT-layered ignition target implosions on NIF spanning a two-year period. A strong sensitivity to variations in the early-time, low-power foot of the laser pulse is observed. It is shown that very small deviations (?0.1% of the total pulse energy) in the first 2 ns of the laser pulse can decrease the measured ?R by 50%.

  18. Supercritical flow in rectangular expansions 

    E-Print Network [OSTI]

    Walsh, Peter.

    1968-01-01

    In recent years the occasions for design of channels to contain supercritical flow has increased considerably. Consequently there has developed a need for a method of predicting the physical characteristics of such flow based on theory...

  19. Radial flow pulse jet mixer

    DOE Patents [OSTI]

    VanOsdol, John G.

    2013-06-25

    The disclosure provides a pulse jet mixing vessel for mixing a plurality of solid particles. The pulse jet mixing vessel is comprised of a sludge basin, a flow surface surrounding the sludge basin, and a downcoming flow annulus between the flow surface and an inner shroud. The pulse jet mixing vessel is additionally comprised of an upper vessel pressurization volume in fluid communication with the downcoming flow annulus, and an inner shroud surge volume separated from the downcoming flow annulus by the inner shroud. When the solid particles are resting on the sludge basin and a fluid such as water is atop the particles and extending into the downcoming flow annulus and the inner shroud surge volume, mixing occurs by pressurization of the upper vessel pressurization volume, generating an inward radial flow over the flow surface and an upwash jet at the center of the sludge basin.

  20. HYDROLYZED WOOD SLURRY FLOW MODELING

    E-Print Network [OSTI]

    Wrathall, Jim

    2012-01-01

    LBL-10090 UC-61 HYDROLYZED WOOD SLURRY FLOW MODELING JimLBL-10090 HYDROLYZED WOOD SLURRY FLOW MODELING Jim Wrathallconversion of hydrolyzed wood slurry to fuel oil, Based on

  1. Modeling Temporal Primitives: Back to Basics Iqbal A. Goralwalla, Yuri Leontiev, M. Tamer Ozsu and Duane Szafron

    E-Print Network [OSTI]

    Szafron, Duane

    Modeling Temporal Primitives: Back to Basics Iqbal A. Goralwalla, Yuri Leontiev, M. Tamer ¨Ozsu of the design space of any temporal model since it is comprised of the basic temporal features that un- derlie

  2. Study of flow fields induced by surface dielectric barrier discharge actuator in low-pressure air

    SciTech Connect (OSTI)

    Che, Xueke E-mail: st@mail.iee.ac.cn; Nie, Wansheng; Tian, Xihui; Hou, Zhiyong; He, Haobo; Zhou, Penghui; Zhou, Siyin; Yang, Chao; Shao, Tao E-mail: st@mail.iee.ac.cn

    2014-04-15

    Surface dielectric barrier discharge (SDBD) is a promising method for a flow control. Flow fields induced by a SDBD actuator driven by the ac voltage in static air at low pressures varying from 1.0 to 27.7?kPa are measured by the particle image velocimetry method. The influence of the applied ac voltage frequency and magnitude on the induced flow fields is studied. The results show that three different classes of flow fields (wall jet flow field, complex flow field, and vortex-shape flow field) can be induced by the SDBD actuator in the low-pressure air. Among them, the wall jet flow field is the same as the tangential jet at atmospheric pressure, which is, together with the vertical jet, the complex flow field. The vortex-shape flow field is composed of one vertical jet which points towards the wall and two opposite tangential jets. The complex and the vortex-shape flow fields can be transformed to the wall jet flow field when the applied ac voltage frequency and magnitude are changed. It is found that the discharge power consumption increases initially, decreases, and then increases again at the same applied ac voltage magnitude when the air pressure decreases. The tangential velocity of the wall jet flow field increases when the air pressure decreases. It is however opposite for the complex flow field. The variation of the applied ac voltage frequency influences differently three different flow fields. When the applied ac voltage magnitude increases at the same applied ac voltage frequency, the maximal jet velocity increases, while the power efficiency increases only initially and then decreases again. The discharge power shows either linear or exponential dependences on the applied ac voltage magnitude.

  3. Structural power flow measurement

    SciTech Connect (OSTI)

    Falter, K.J.; Keltie, R.F.

    1988-12-01

    Previous investigations of structural power flow through beam-like structures resulted in some unexplained anomalies in the calculated data. In order to develop structural power flow measurement as a viable technique for machine tool design, the causes of these anomalies needed to be found. Once found, techniques for eliminating the errors could be developed. Error sources were found in the experimental apparatus itself as well as in the instrumentation. Although flexural waves are the carriers of power in the experimental apparatus, at some frequencies longitudinal waves were excited which were picked up by the accelerometers and altered power measurements. Errors were found in the phase and gain response of the sensors and amplifiers used for measurement. A transfer function correction technique was employed to compensate for these instrumentation errors.

  4. Modeling Temporal-Spatial Earthquake and Volcano Clustering at Yucca Mountain, Nevada

    SciTech Connect (OSTI)

    T. Parsons; G.A. Thompson; A.H. Cogbill

    2006-05-31

    The proposed national high-level nuclear repository at Yucca Mountain is close to Quaternary faults and cinder cones. The frequency of these events is low, with indications of spatial and temporal clustering, making probabilistic assessments difficult. In an effort to identify the most likely intrusion sites, we based a 3D finite element model on the expectation that faulting and basalt intrusions are primarily sensitive to the magnitude and orientation of the least principal stress in extensional terranes. We found that in the absence of fault slip, variation in overburden pressure caused a stress state that preferentially favored intrusions at Crater Flat. However, when we allowed central Yucca Mountain faults to slip in the model, we found that magmatic clustering was not favored at Crater Flat or in the central Yucca Mountain block. Instead, we calculated that the stress field was most encouraging to intrusions near fault terminations, consistent with the location of the most recent volcanism at Yucca Mountain, the Lathrop Wells cone. We found this linked fault and magmatic system to be mutually reinforcing in the model in that dike inflation favored renewed fault slip.

  5. Disentangling multidimensional spatio-temporal data into their common and aberrant responses

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Chang, Young Hwan; Korkola, James; Amin, Dhara N.; Moasser, Mark M.; Carmena, Jose M.; Gray, Joe W.; Tomlin, Claire J.; Lisacek, Frederique

    2015-04-22

    With the advent of high-throughput measurement techniques, scientists and engineers are starting to grapple with massive data sets and encountering challenges with how to organize, process and extract information into meaningful structures. Multidimensional spatio-temporal biological data sets such as time series gene expression with various perturbations over different cell lines, or neural spike trains across many experimental trials, have the potential to acquire insight about the dynamic behavior of the system. For this potential to be realized, we need a suitable representation to understand the data. A general question is how to organize the observed data into meaningful structures andmore »how to find an appropriate similarity measure. A natural way of viewing these complex high dimensional data sets is to examine and analyze the large-scale features and then to focus on the interesting details. Since the wide range of experiments and unknown complexity of the underlying system contribute to the heterogeneity of biological data, we develop a new method by proposing an extension of Robust Principal Component Analysis (RPCA), which models common variations across multiple experiments as the lowrank component and anomalies across these experiments as the sparse component. We show that the proposed method is able to find distinct subtypes and classify data sets in a robust way without any prior knowledge by separating these common responses and abnormal responses. Thus, the proposed method provides us a new representation of these data sets which has the potential to help users acquire new insight from data.« less

  6. BRICSLS-97-1Chomicki&Toman:TemporalLogicinInformationSystems BRICSBasic Research in Computer Science

    E-Print Network [OSTI]

    Toman, David

    BRICSLS-97-1Chomicki&Toman:TemporalLogicinInformationSystems BRICSBasic Research in Computer Science Temporal Logic in Information Systems Jan Chomicki David Toman BRICS Lecture Series LS-97-1 ISSN/1/ #12;Temporal Logic in Information Systems Jan Chomicki David Toman #12;#12;Jan Chomicki Dept

  7. Author's personal copy Temporal and spatial trends of total petroleum hydrocarbons in the seawater

    E-Print Network [OSTI]

    Ma, Lena

    Author's personal copy Temporal and spatial trends of total petroleum hydrocarbons in the seawater hydrocarbons Bohai Bay Temporal and spatial trends Seawater a b s t r a c t The temporal and spatial distribution of total petroleum hydrocarbons (TPH) in the seawater of Tianjin Bohai Bay during 1996

  8. ECEM/EAML 2004 Segmentation of paleoecological spatio-temporal count data

    E-Print Network [OSTI]

    Toivonen, Hannu

    ECEM/EAML 2004 Segmentation of paleoecological spatio-temporal count data Kari Vasko1 , Hannu will consider applications of segmentation analysis towards analysis of paleoecological spatio-temporal time framework for the spatio-temporal segmentation problems that occurs in paleoecology and discuss

  9. IEEE TRANSACTIONS ON EVOLUTIONARY COMPUTATION, VOL. 13, NO. 1, FEBRUARY 2009 169 Optimization of Temporal Processes

    E-Print Network [OSTI]

    Kusiak, Andrew

    , nonlinear temporal process, optimization. NOMENCLATURE Vector of controllable variables of a process. th of Temporal Processes: A Model Predictive Control Approach Zhe Song and Andrew Kusiak, Member, IEEE Abstract--A dynamic predictive-control model of a nonlinear and temporal process is considered. Evolutionary

  10. Ricci flow and quantum theory

    E-Print Network [OSTI]

    Robert Carroll

    2007-11-05

    We show some relations between Ricci flow and quantum theory via Fisher information and the quantum potential.

  11. Flow dynamics of the Moon

    E-Print Network [OSTI]

    Yu. N. Bratkov

    2010-04-03

    Flow analysis of big basins is given. Internal structure of flows is considered. Correlations between flows are calculated. For example, Mare Orientale is a moving basin. Orientale and Imbrium continental basins are introduced and are considered. Olbers ray crater is a result of precise interaction of the two basins. Flows of the Tycho type are studied. Two Antarctidae, an Indian Ocean, and an America are demonstrated.

  12. Formation of the compression zone in a plasma flow generated by a magnetoplasma compressor

    SciTech Connect (OSTI)

    Solyakov, D. G. Petrov, Yu. V.; Garkusha, I. E.; Chebotarev, V. V.; Ladygina, M. S.; Cherednichenko, T. N.; Morgal’, Ya. I.; Kulik, N. V.; Stal’tsov, V. V.; Eliseev, D. V.

    2013-12-15

    Processes occurring in a plasma flow generated by a magnetoplasma compressor (MPC) during the formation of the compression zone are discussed. The paper presents results of measurements of the spatial distribution of the electric current in the plasma flow, the temporal and spatial (along the flow) distributions of the plasma density, and the profiles of the velocity of individual flow layers along the system axis. The spatial distribution of the electromagnetic force in the flow is analyzed. It is shown that the plasma flow is decelerated when approaching the compression zone and reaccelerated after passing it. In this case, the plasma flow velocity decreases from ? = (2–3) × 10{sup 7} cm/s at the MPC output to ? < 10{sup 6} cm/s in the region of maximum compression and then again increases to 10{sup 7} cm/s at a distance of 15–17 cm from the MPC output. In some MPC operating modes, a displacement of the magnetic field from the compression zone and the formation of toroidal electric current vortices in the plasma flow after passing the compression zone were detected.

  13. Spatial-temporal event detection in climate parameter imagery.

    SciTech Connect (OSTI)

    McKenna, Sean Andrew; Gutierrez, Karen A.

    2011-10-01

    Previously developed techniques that comprise statistical parametric mapping, with applications focused on human brain imaging, are examined and tested here for new applications in anomaly detection within remotely-sensed imagery. Two approaches to analysis are developed: online, regression-based anomaly detection and conditional differences. These approaches are applied to two example spatial-temporal data sets: data simulated with a Gaussian field deformation approach and weekly NDVI images derived from global satellite coverage. Results indicate that anomalies can be identified in spatial temporal data with the regression-based approach. Additionally, la Nina and el Nino climatic conditions are used as different stimuli applied to the earth and this comparison shows that el Nino conditions lead to significant decreases in NDVI in both the Amazon Basin and in Southern India.

  14. Multi-Photon Interference and Temporal Distinguishability of Photons

    E-Print Network [OSTI]

    Z. Y. Ou

    2007-08-24

    A number of recent interference experiments involving multiple photons are reviewed. These experiments include generalized photon bunching effects, generalized Hong-Ou-Mandel interference effects and multi-photon interferometry for demonstrations of multi-photon de Broglie wavelength. The multi-photon states used in these experiments are from two pairs of photons in parametric down-conversion. We find that the size of the interference effect in these experiments, characterized by the visibility of interference pattern, is governed by the degree of distinguishability among different pairs of photons. Based on this discovery, we generalize the concept of multi-photon temporal distinguishability and relate it to a number of multi-photon interference effects. Finally, we make an attempt to interpret the coherence theory by the multi-photon interference via the concept of temporal distinguishability of photons.

  15. Temporal Intermittency of Energy Dissipation in Magnetohydrodynamic Turbulence

    E-Print Network [OSTI]

    Zhdankin, Vladimir; Boldyrev, Stanislav

    2015-01-01

    Energy dissipation in magnetohydrodynamic (MHD) turbulence is known to be highly intermittent in space, being concentrated in sheet-like coherent structures. Much less is known about intermittency in time, another fundamental aspect of turbulence which has great importance for observations of solar flares and other space/astrophysical phenomena. In this Letter, we investigate the temporal intermittency of energy dissipation in numerical simulations of MHD turbulence. We consider four-dimensional spatiotemporal structures, "flare events", responsible for a large fraction of the energy dissipation. We find that although the flare events are often highly complex, they exhibit robust power-law distributions and scaling relations. We find that the probability distribution of dissipated energy has a power law index close to -1.75, similar to observations of solar flares, indicating that intense dissipative events dominate the heating of the system. We also discuss the temporal asymmetry of flare events as a signatu...

  16. TEP process flow diagram

    SciTech Connect (OSTI)

    Wilms, R Scott; Carlson, Bryan; Coons, James; Kubic, William

    2008-01-01

    This presentation describes the development of the proposed Process Flow Diagram (PFD) for the Tokamak Exhaust Processing System (TEP) of ITER. A brief review of design efforts leading up to the PFD is followed by a description of the hydrogen-like, air-like, and waterlike processes. Two new design values are described; the mostcommon and most-demanding design values. The proposed PFD is shown to meet specifications under the most-common and mostdemanding design values.

  17. Convective heat flow probe

    DOE Patents [OSTI]

    Dunn, J.C.; Hardee, H.C.; Striker, R.P.

    1984-01-09

    A convective heat flow probe device is provided which measures heat flow and fluid flow magnitude in the formation surrounding a borehole. The probe comprises an elongate housing adapted to be lowered down into the borehole; a plurality of heaters extending along the probe for heating the formation surrounding the borehole; a plurality of temperature sensors arranged around the periphery of the probe for measuring the temperature of the surrounding formation after heating thereof by the heater elements. The temperature sensors and heater elements are mounted in a plurality of separate heater pads which are supported by the housing and which are adapted to be radially expanded into firm engagement with the walls of the borehole. The heat supplied by the heater elements and the temperatures measured by the temperature sensors are monitored and used in providing the desired measurements. The outer peripheral surfaces of the heater pads are configured as segments of a cylinder and form a full cylinder when taken together. A plurality of temperature sensors are located on each pad so as to extend along the length and across the width thereof, with a heating element being located in each pad beneath the temperature sensors. An expansion mechanism driven by a clamping motor provides expansion and retraction of the heater pads and expandable packet-type seals are provided along the probe above and below the heater pads.

  18. Microgravity Flow Regime Transition Modeling 

    E-Print Network [OSTI]

    Shephard, Adam M.

    2010-07-14

    Flow regime transitions and the modeling thereof underlie the design of microgravity two-phase systems. Through the use of the zero-g laboratory, microgravity two-phase flows can be studied. Because microgravity two-phase flows exhibit essentially...

  19. The Calculus of Variations The variational principles of mechanics are firmly rooted in the

    E-Print Network [OSTI]

    Hunter, John K.

    LECTURE 3 The Calculus of Variations The variational principles of mechanics are firmly rooted in the soil of that great century of Liberalism which starts with Descartes and ends with the French, from geometry to optimization to mechanics, and it has grown so large that it is difficult to describe

  20. Generator Response to Load Variation The below table summarizes the way that load variation is

    E-Print Network [OSTI]

    McCalley, James D.

    1 Generator Response to Load Variation The below table summarizes the way that load variation is allocated to generators in a power system. In these notes, we derive the proximity effect, the inertial, constant impedance loads, and the network reduced to generator internal nodes. This expression was: { }00

  1. Modeling shrouded stator cavity flows in axial-flow compressors

    SciTech Connect (OSTI)

    Wellborn, S.R.; Tolchinsky, I.; Okiishi, T.H.

    2000-01-01

    Experiments and computational analyses were completed to understand the nature of shrouded stator cavity flows. From this understanding, a one-dimensional model of the flow through shrouded stator cavities was developed. This model estimates the leakage mass flow, temperature rise, and angular momentum increase through the cavity, given geometry parameters and the flow conditions at the interface between the cavity and primary flow path. This cavity model consists of two components, one that estimates the flow characteristics through the labyrinth seals and the other that predicts the transfer of momentum due to windage. A description of the one-dimensional model is given. The incorporation and use of the one-dimensional model in a multistage compressor primary flow analysis tool is described. The combination of this model and the primary flow solver was used to reliably simulate the significant impact on performance of the increase of hub seal leakage in a twelve-stage axial-flow compressor. Observed higher temperatures of the hub region fluid, different stage matching, and lower overall efficiencies and core flow than expected could be correctly linked to increased hub seal clearance with this new technique. The importance of including these leakage flows in compressor simulations is shown.

  2. Mechanical annealing in the flow of supercooled metallic liquid

    SciTech Connect (OSTI)

    Zhang, Meng [State Key Lab of Materials Processing and Die and Mold Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074 (China); State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190 (China); Dai, Lan Hong [State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190 (China); Liu, Lin, E-mail: lliu2000@mail.hust.edu.cn [State Key Lab of Materials Processing and Die and Mold Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074 (China)

    2014-08-07

    Flow induced structural evolution in a supercooled metallic liquid Vit106a (Zr{sub 58.5}Cu{sub 15.6}Al{sub 10.3}Ni{sub 12.8}Nb{sub 2.8}, at.?%) was investigated via uni-axial compression combined with differential scanning calorimeter (DSC). Compression tests at strain rates covering the transition from Newtonian flow to non-Newtonian flow and at the same strain rate 2?×?10{sup ?1} s{sup ?1} to different strains were performed at the end of glass transition (T{sub g-end}?=?703?K). The relaxation enthalpies measured by DSC indicate that the samples underwent non-Newtonian flow contain more free volume than the thermally annealed sample (703?K, 4?min), while the samples underwent Newtonian flow contain less, namely, the free volume of supercooled metallic liquids increases in non-Newtonian flow, while decreases in Newtonian flow. The oscillated variation of the relaxation enthalpies of the samples deformed at the same strain rate 2?×?10{sup ?1} s{sup ?1} to different strains confirms that the decrease of free volume was caused by flow stress, i.e., “mechanical annealing.” Micro-hardness tests were also performed to show a similar structural evolution tendency. Based on the obtained results, the stress-temperature scaling in the glass transition of metallic glasses are supported experimentally, as stress plays a role similar to temperature in the creation and annihilation of free volume. In addition, a widening perspective angle on the glass transition of metallic glasses by exploring the 3-dimensional stress-temperature-enthalpy phase diagram is presented. The implications of the observed mechanical annealing effect on the amorphous structure and the work-hardening mechanism of metallic glasses are elucidated based on atomic level stress model.

  3. A Database and Meta-Analysis of Ecological Responses to Flow in the South Atlantic Region

    SciTech Connect (OSTI)

    McManamay, Ryan A [ORNL; Orth, Dr. Donald J [Virginia Polytechnic Institute and State University (Virginia Tech); Davis, Dr, Mary [Southeastern Aquatic Resources Partnership; Kauffman, John [John Kauffman LLC.

    2013-01-01

    Generalized and quantitative relationships between flow and ecology are pivotal to developing environmental flow standards based on socially acceptable ecological conditions. Informing management at regional scales requires compiling sufficient hydrologic and ecological sources of information, identifying information gaps, and creating a framework for hypothesis development and testing. We compiled studies of empirical and theoretical relationships between flow and ecology in the South Atlantic region (SAR) of the United States to evaluate their utility for the development of environmental flow standards. Using database searches, internet searches, and agency contacts, we gathered 186 sources of information that provided a qualitative or quantitative relationship between flow and ecology within states encompassing the SAR. A total of 109 of the 186 sources had sufficient information to support quantitative analyses. Ecological responses to natural changes in flow magnitude, frequency, and duration were highly variable regardless of the direction and magnitude of changes in flow. In contrast, the majority of ecological responses to anthropogenic-induced flow alterations were negative. Fish consistently showed negative responses to anthropogenic flow alterations whereas other ecological groups showed somewhat variable responses (e.g. macroinvertebrates and riparian vegetation) and even positive responses (e.g. algae). Fish and organic matter had sufficient sample sizes to stratify natural flow-ecology relationships by specific flow categories (e.g. high flow, baseflows) or by region (e.g. coastal plain, uplands). After stratifying relationships, we found that significant correlations existed between changes in natural flow and ecological responses. In addition, a regression tree explained 57% of the variation in fish responses to anthropogenic and natural changes in flow. Because of some ambiguity in interpreting the directionality in ecological responses, we utilized ecological gains or losses, where each represents a benefit or reduction to ecosystem services, respectively. Variables explained 49% of the variation in ecological gains and losses for all ecological groups combined. Altogether, our results suggested that the source of flow change and the ecological group of interest played primary roles in determining the direction and magnitude of ecological responses. Furthermore, our results suggest that developing broadly generalized relationships between ecology and changes in flow at a regional scale is unlikely unless relationships are placed within meaningful contexts, such as environmental flow components or by geomorphic setting.

  4. A Categorial Variation Database for English Nizar Habash

    E-Print Network [OSTI]

    Dorr, Bonnie

    A Categorial Variation Database for English Nizar Habash Institute for Advanced Computer Studies variation in multilin- gual applications, our categorial-variation re- source may serve as an integral part that focuses on categorial variations.1 In the rest of this paper, we discuss other available re- sources

  5. Seasonal ozone variations in the upper mesosphere

    SciTech Connect (OSTI)

    Thomas, R.J. (Univ. of Colorado, Boulder (United States))

    1990-05-20

    The global daytime ozone was measured by the Solar Mesosphere Explorer satellite (SME) for 5 years. The measurements extend through the mesosphere, covering from 50 km to over 90 km. The ozone in the upper mesosphere varies annually by up to a factor of 3. The observed seasonal variations may be summarized in several different ways. From year to year there is a great deal of repeatability of these variations. This repeatability occurs in most of the upper mesosphere outside the tropics. Near 0.01 mbar (80 km) the mid- and high-latitude mixing ratio peaks each year in mid-April. A secondary maximum in the altitude profile of ozone density usually occurs near 85 km. Changes in this structure are directly related to the April maximum and other seasonal changes seen at 0.01 mbar. The changing seasonal structure produces a bump at the ozone mixing ratio minimum that is largest just after spring equinox. This perturbation to the mixing ratio profile seems to move upward during the first half of the year. The seasonal changes of ozone were analyzed in terms of annual and semiannual structure. The variations generally have both an annual and semiannual component depending on altitude and latitude. The phases of the variations change quickly with both altitude and latitude. The semiannual component peaks in April, over most of the upper mesosphere.

  6. Overcoming Variations in Nanometer-Scale Technologies

    E-Print Network [OSTI]

    Sapatnekar, Sachin

    -- Nanometer-scale circuits are fundamentally different from those built in their predecessor technologies, both in terms of performance analysis and optimization. This paper presents an overview of the root such as supply voltage changes, thermal effects, and radiation-induced soft errors. · Aging variations reflect

  7. Symplectic-energy-momentum preserving variational integrators

    E-Print Network [OSTI]

    Ortiz, Michael

    to AIP license or copyright, see http://ojps.aip.org/jmp/jmpcr.jsp #12;than energy preservationSymplectic-energy-momentum preserving variational integrators C. Kane Graduate Aeronautical mechanical systems that are symplectic and energy and momentum conserving. To do this, a space­time view

  8. Variational functions in degenerate open quantum systems

    SciTech Connect (OSTI)

    Jakob, Matthias; Stenholm, Stig [Laser Physics and Quantum Optics, Royal Institute of Technology (KTH), Alba Nova, Roslagstullsbacken 21, SE-10691 Stockholm (Sweden)

    2004-04-01

    We have derived a Lyapunov functional for a degenerate open atomic system. This functional develops monotonically towards its stationary state. The open system is described by a Lindblad-type master equation. For the construction of the variational functional it is necessary that the Lindblad operator can be diagonalized. Since the generator of motion is non-Hermitian, diagonalization is, in general, only possible if the eigenvalues are nondegenerate. In this paper, we propose that in a physical system the biorthogonal eigenbasis of the Lindblad operator remains complete even when degeneracy is present. Thus diagonalization of the Lindblad operator, and consequently the construction of the variational functional, is still possible. We discuss the reasons and illustrate the theory of the variational functional for a driven {lambda}-type three-level atom with degenerate ground state. The degeneracy has interesting effects on the variational functional in the steady state with respect to its interpretation as an entropic quantity. In case of the driven three-level atom, the dark state turns out to be an isentropic state.

  9. Equilibria, Supernetworks, and Evolutionary Variational Inequalities

    E-Print Network [OSTI]

    Nagurney, Anna

    -Verlag, Heidelberg, Germany. #12;The Supply Chain Network Equilibrium Model with Fixed Demands Commodities with price Electric Power Supply Chains and Transportation Networks: An Evolutionary Variational Inequality The static multitiered network equilibrium models ­ Supply chain networks with fixed demand ­ Electric power

  10. A Variational Approach to MR Bias Correction

    E-Print Network [OSTI]

    Willsky, Alan S.

    sequences, the MR signal is given by: We can target , T1, and T2 measurements through appropriate selectionA Variational Approach to MR Bias Correction Ayres Fan Stochastic Systems Group Research Qualifying Exam June 10, 2003 #12;Outline 1. Introduction to bias correction 2. Magnetic resonance imaging 3

  11. A Variational Approach to MR Bias Correction

    E-Print Network [OSTI]

    Willsky, Alan S.

    A Variational Approach to MR Bias Correction Ayres Fan Stochastic Systems Group July 17, 2003 With W. Wells, J. Fisher, M. Cetin, S. Haker, R. Mulkern, C. Tempany, A. Willsky #12;Outline 1 inhomogeneity that corrupts magnetic resonance (MR) images. Correcting for the bias field makes both human

  12. A Variational Approach to MR Bias Correction

    E-Print Network [OSTI]

    Willsky, Alan S.

    A Variational Approach to MR Bias Correction Ayres Fan, W. Wells, J. Fisher, M. Cetin, S. Haker, A that corrupts magnetic resonance (MR) images. Correcting for the bias field makes both human analysis (e that encourages smoothness in b and piecewise smoothness in f: We generally choose p 1 to help preserve edges D

  13. GENETIC DIVERSITY, POPULATION SUBDIVISION AND GENE FLOW IN MORELET'S CROCODILE (CROCODYLUS MORELETII) FROM BELIZE, CENTRAL

    E-Print Network [OSTI]

    Dever, Jennifer A.

    , microsatellites, conservation Suggested Running Head: Gene flow in Morelet's crocodile populations Manuscript, New River and New River Lagoon, may form an important source for genetic variation for smaller. moreletii for other drainages in Belize and will be useful in optimizing future management programs for C

  14. Flow Battery Technology

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home Room NewsInformation Current HABFES OctoberEvanServices »First ObservationFast(ER1)Flow Battery

  15. Composition pulse time-of-flight mass flow sensor

    DOE Patents [OSTI]

    Harnett, Cindy K. (Livermore, CA); Crocker, Robert W. (Fremont, CA); Mosier, Bruce P. (San Francisco, CA); Caton, Pamela F. (Berkeley, CA); Stamps, James F. (Livermore, CA)

    2007-06-05

    A device for measuring fluid flow rates over a wide range of flow rates (<1 nL/min to >10 .mu.L/min) and at pressures at least as great as 2,000 psi. The invention is particularly adapted for use in microfluidic systems. The device operates by producing compositional variations in the fluid, or pulses, that are subsequently detected downstream from the point of creation to derive a flow rate. Each pulse, comprising a small fluid volume, whose composition is different from the mean composition of the fluid, can be created by electrochemical means, such as by electrolysis of a solvent, electrolysis of a dissolved species, or electrodialysis of a dissolved ionic species. Measurements of the conductivity of the fluid can be used to detect the arrival time of the pulses, from which the fluid flow rate can be determined. A pair of spaced apart electrodes can be used to produce the electrochemical pulse. In those instances where it is desired to measure a wide range of fluid flow rates a three electrode configuration in which the electrodes are spaced at unequal distances has been found to be desirable.

  16. Influence of Atmospheric Pressure and Water Table Fluctuations on Gas Phase Flow and Transport of Volatile Organic Compounds (VOCs) in Unsaturated Zones 

    E-Print Network [OSTI]

    You, Kehua

    2013-04-19

    solution in a three-layered unsaturated zone in response to field atmospheric pressure fluctuations at the Hanford site in Richland, Washington... ................................................................................................. 92 4.3 Comparison of gas flow rate calculated by the ML solution with measured flow rates in a three-layered unsaturated zone in response to field atmospheric pressure variations at the Hanford site in Richland...

  17. A STUDY OF LIQUID METAL FILM FLOW, UNDER FUSION RELEVANT MAGNETIC FIELDS M. Narula, A. Ying and M.A. Abdou

    E-Print Network [OSTI]

    Abdou, Mohamed

    A STUDY OF LIQUID METAL FILM FLOW, UNDER FUSION RELEVANT MAGNETIC FIELDS M. Narula, A. Ying and M of the fluid film, unwanted flow deflection, creation of bare spots with no fluid protection, creation of regions of thick stagnant fluid leading to hot spots, stream wise and span wise variation of fluid film

  18. Spiral Laminar Flow: A revolution in understanding?

    E-Print Network [OSTI]

    Greenaway, Alan

    Blood Flow Spiral laminar flow #12;Spiral flow in the Aorta (MRI) Computational Fluid Dynamics 0 10 20Spiral Laminar Flow: A revolution in understanding? Reintroduction of natural blood flow Laminar Flow through Runoff (3months) Proximal Anastomosis SLF TM Graft Distal Anastomosis Post-op Angios

  19. Radial flow heat exchanger

    DOE Patents [OSTI]

    Valenzuela, Javier (Hanover, NH)

    2001-01-01

    A radial flow heat exchanger (20) having a plurality of first passages (24) for transporting a first fluid (25) and a plurality of second passages (26) for transporting a second fluid (27). The first and second passages are arranged in stacked, alternating relationship, are separated from one another by relatively thin plates (30) and (32), and surround a central axis (22). The thickness of the first and second passages are selected so that the first and second fluids, respectively, are transported with laminar flow through the passages. To enhance thermal energy transfer between first and second passages, the latter are arranged so each first passage is in thermal communication with an associated second passage along substantially its entire length, and vice versa with respect to the second passages. The heat exchangers may be stacked to achieve a modular heat exchange assembly (300). Certain heat exchangers in the assembly may be designed slightly differently than other heat exchangers to address changes in fluid properties during transport through the heat exchanger, so as to enhance overall thermal effectiveness of the assembly.

  20. Fluid flow monitoring device

    DOE Patents [OSTI]

    McKay, M.D.; Sweeney, C.E.; Spangler, B.S. Jr.

    1993-11-30

    A flow meter and temperature measuring device are described comprising a tube with a body centered therein for restricting flow and a sleeve at the upper end of the tube to carry several channels formed longitudinally in the sleeve to the appropriate axial location where they penetrate the tube to allow pressure measurements and temperature measurements with thermocouples. The high pressure measurement is made using a channel penetrating the tube away from the body and the low pressure measurement is made at a location at the widest part of the body. An end plug seals the end of the device and holes at its upper end allow fluid to pass from the interior of the tube into a plenum. The channels are made by cutting grooves in the sleeve, the grooves widened at the surface of the sleeve and then a strip of sleeve material is welded to the grooves closing the channels. Preferably the sleeve is packed with powdered graphite before cutting the grooves and welding the strips. 7 figures.

  1. Fluid flow monitoring device

    DOE Patents [OSTI]

    McKay, Mark D. (1426 Socastee Dr., North Augusta, SC 29841); Sweeney, Chad E. (3600 Westhampton Dr., Martinez, GA 30907-3036); Spangler, Jr., B. Samuel (2715 Margate Dr., Augusta, GA 30909)

    1993-01-01

    A flow meter and temperature measuring device comprising a tube with a body centered therein for restricting flow and a sleeve at the upper end of the tube to carry several channels formed longitudinally in the sleeve to the appropriate axial location where they penetrate the tube to allow pressure measurements and temperature measurements with thermocouples. The high pressure measurement is made using a channel penetrating the tube away from the body and the low pressure measurement is made at a location at the widest part of the body. An end plug seals the end of the device and holes at its upper end allow fluid to pass from the interior of the tube into a plenum. The channels are made by cutting grooves in the sleeve, the grooves widened at the surface of the sleeve and then a strip of sleeve material is welded to the grooves closing the channels. Preferably the sleeve is packed with powdered graphite before cutting the grooves and welding the strips.

  2. Comparative study of laminar and turbulent flow model with different operating parameters for radio frequency-inductively coupled plasma torch working at 3??MHz frequency at atmospheric pressure

    SciTech Connect (OSTI)

    Punjabi, Sangeeta B.; Sahasrabudhe, S. N.; Das, A. K.; Joshi, N. K.; Mangalvedekar, H. A.; Kothari, D. C.

    2014-01-15

    This paper provides 2D comparative study of results obtained using laminar and turbulent flow model for RF (radio frequency) Inductively Coupled Plasma (ICP) torch. The study was done for the RF-ICP torch operating at 50?kW DC power and 3?MHz frequency located at BARC. The numerical modeling for this RF-ICP torch is done using ANSYS software with the developed User Defined Function. A comparative study is done between laminar and turbulent flow model to investigate how temperature and flow fields change when using different operating conditions such as (a) swirl and no swirl velocity for sheath gas flow rate, (b) variation in sheath gas flow rate, and (c) variation in plasma gas flow rate. These studies will be useful for different material processing applications.

  3. Helium and Deuterium Abundances as a Test for the Time Variation of the Fine Structure Constant and the Higgs Vacuum Expectation Value

    E-Print Network [OSTI]

    Nidal Chamoun; Susana J. Landau; Mercedes E. Mosquera; Hector Vucetich

    2006-12-21

    We use the semi-analytic method of \\citet{Esma91} to calculate the abundances of Helium and Deuterium produced during Big Bang nucleosynthesis assuming the fine structure constant and the Higgs vacuum expectation value may vary in time. We analyze the dependence on the fundamental constants of the nucleon mass, nuclear binding energies and cross sections involved in the calculation of the abundances. Unlike previous works, we do not assume the chiral limit of QCD. Rather, we take into account the quark masses and consider the one-pion exchange potential, within perturbation theory, for the proton-neutron scattering. However, we do not consider the time variation of the strong interactions scale but attribute the changes in the quark masses to the temporal variation of the Higgs vacuum expectation value. Using the observational data of the helium and deuterium, we put constraints on the variation of the fundamental constants between the time of nucleosynthesis and the present time.

  4. Single-shot 35 fs temporal resolution electron shadowgraphy

    SciTech Connect (OSTI)

    Scoby, C. M.; Li, R. K.; Threlkeld, E.; To, H.; Musumeci, P. [Department of Physics and Astronomy, UCLA, Los Angeles, California 90095 (United States)] [Department of Physics and Astronomy, UCLA, Los Angeles, California 90095 (United States)

    2013-01-14

    We obtain single-shot time-resolved shadowgraph images of the electromagnetic fields resulting from the interaction of a high intensity ultrashort laser pulse with a metal surface. Using a high brightness relativistic electron beam and a high streaking speed radiofrequency deflector, we report <35 fs temporal resolution enabling a direct visualization of the retarded-time dominated field evolution which follows the laser-induced charge emission. A model including the finite signal propagation speed well reproduces the data and yields measurements of fundamental parameters in short pulse laser-matter interaction such as the amount of emitted charge and the emission time scale.

  5. Active combustion flow modulation valve

    DOE Patents [OSTI]

    Hensel, John Peter; Black, Nathaniel; Thorton, Jimmy Dean; Vipperman, Jeffrey Stuart; Lambeth, David N; Clark, William W

    2013-09-24

    A flow modulation valve has a slidably translating hollow armature with at least one energizable coil wound around and fixably attached to the hollow armature. The energizable coil or coils are influenced by at least one permanent magnet surrounding the hollow armature and supported by an outer casing. Lorentz forces on the energizable coils which are translated to the hollow armature, increase or decrease the flow area to provide flow throttling action. The extent of hollow armature translation depends on the value of current supplied and the direction of translation depends on the direction of current flow. The compact nature of the flow modulation valve combined with the high forces afforded by the actuator design provide a flow modulation valve which is highly responsive to high-rate input control signals.

  6. Drains Debubbler Transport Liq. Flow

    E-Print Network [OSTI]

    Weber, Rodney

    Drains Debubbler Transport Liq. Flow (LiF) aq. Anion Cation Waste Vacuum Pump LiF H2 O Pure H2 O 1 Denuders Cyclon 16 L/min 2.5 µm cut Sample Tubing ColourFlow, mL/minTubing green/green-1 green/green-2, and Liquid Flow Rates Are Possible Cation: metrosep 2100B-100x4.0mm Eluent: 0.250g/L Dipicolinic acid 1000 u

  7. A Query Calculus for Spatio-Temporal Object Databases Tony Griffiths, Alvaro A. A. Fernandes, Nassima Djafri, Norman W. Paton

    E-Print Network [OSTI]

    Paton, Norman

    the development of a com- plete spatio-temporal DBMS. This has given rise to a sub- stantial collection of results and aspatial data. ODMG Model Temporal Types Spatial Types Histories Spatio-Temporal Algebra Spatio using histories. A history is a set of timestamp-value pairs, where the timestamp is of a temporal type

  8. A Query Calculus for SpatioTemporal Object Databases Tony Griffiths, Alvaro A. A. Fernandes, Nassima Djafri, Norman W. Paton

    E-Print Network [OSTI]

    Fernandes, Alvaro A. A.

    the development of a com­ plete spatio­temporal DBMS. This has given rise to a sub­ stantial collection of results and aspatial data. ODMG Model Temporal Types Spatial Types Histories Spatio-Temporal Algebra Spatio using histories. A history is a set of timestamp­value pairs, where the timestamp is of a temporal type

  9. A Variational Formulation of Dissipative Quasicontinuum Methods

    E-Print Network [OSTI]

    Rokoš, Ond?ej; Zeman, Jan; Peerlings, Ron H J

    2016-01-01

    Lattice systems and discrete networks with dissipative interactions are successfully employed as meso-scale models of heterogeneous solids. As the application scale generally is much larger than that of the discrete links, physically relevant simulations are computationally expensive. The QuasiContinuum (QC) method is a multiscale approach that reduces the computational cost of direct numerical simulations by fully resolving complex phenomena only in regions of interest while coarsening elsewhere. In previous work (Beex et al., J. Mech. Phys. Solids 64, 154-169, 2014), the originally conservative QC methodology was generalized to a virtual-power-based QC approach that includes local dissipative mechanisms. In this contribution, the virtual-power-based QC method is reformulated from a variational point of view, by employing the energy-based variational framework for rate-independent processes (Mielke and Roub\\'{i}\\v{c}ek, Rate-Independent Systems: Theory and Application, Springer-Verlag, 2015). By construction...

  10. On seismic signatures of rapid variation

    E-Print Network [OSTI]

    G. Houdek; D. O. Gough

    2006-12-01

    We present an improved model for an asteroseismic diagnostic contained in the frequency spacing of low-degree acoustic modes. By modelling in a realistic manner regions of rapid variation of dynamically relevant quantities, which we call acoustic glitches, we can derive signatures of the gross properties of those glitches. In particular, we are interested in measuring properties that are related to the helium ionization zones and to the rapid variation in the background state associated with the lower boundary of the convective envelope. The formula for the seismic diagnostic is tested against a sequence of theoretical models of the Sun, and is compared with seismic diagnostics published previously by Monteiro & Thompson (1998, 2005) and by Basu et al. (2004).

  11. Elliptic Flow at Large Viscosity

    E-Print Network [OSTI]

    Volker Koch

    2009-09-18

    In this contribution we present an alternative scenario for the large elliptic flow observed in relativistic heavy ion collisions. Motivated by recent results from Lattice QCD on flavor off-diagonal susceptibilities we argue that the matter right above $T_{c}$ can be described by single-particle dynamics in a repulsive single-particle potential, which in turn gives rise to elliptic flow. These ideas can be tested experimentally by measuring elliptic flow of heavy quarks, preferably via the measurement of $J/\\Psi$ elliptic flow.

  12. Module bay with directed flow

    SciTech Connect (OSTI)

    Torczynski, John R. (Albuquerque, NM)

    2001-02-27

    A module bay requires less cleanroom airflow. A shaped gas inlet passage can allow cleanroom air into the module bay with flow velocity preferentially directed toward contaminant rich portions of a processing module in the module bay. Preferential gas flow direction can more efficiently purge contaminants from appropriate portions of the module bay, allowing a reduced cleanroom air flow rate for contaminant removal. A shelf extending from an air inlet slit in one wall of a module bay can direct air flowing therethrough toward contaminant-rich portions of the module bay, such as a junction between a lid and base of a processing module.

  13. Intrinsic Storage Valuation by Variational Analysis

    E-Print Network [OSTI]

    Dmitry Lesnik

    2015-06-22

    The mathematical problem concerning intrinsic storage optimisation is formulated and solved by means of variational analysis. The solution, though obtained in implicit form, still sheds light on many important features of the optimal exercise strategy. It is shown how the solution depends on different constraint types including carry cost and cycle constraint. Additionally, the relationship between intrinsic and stochastic solutions is investigated. In particular, we show that the optimal stochastic exercise decision is always close to the intrinsic one.

  14. Optimal Control of Evolution Mixed Variational Inclusions

    SciTech Connect (OSTI)

    Alduncin, Gonzalo, E-mail: alduncin@geofisica.unam.mx [Universidad Nacional Autónoma de México, Departamento de Recursos Naturales, Instituto de Geofísica (Mexico)

    2013-12-15

    Optimal control problems of primal and dual evolution mixed variational inclusions, in reflexive Banach spaces, are studied. The solvability analysis of the mixed state systems is established via duality principles. The optimality analysis is performed in terms of perturbation conjugate duality methods, and proximation penalty-duality algorithms to mixed optimality conditions are further presented. Applications to nonlinear diffusion constrained problems as well as quasistatic elastoviscoplastic bilateral contact problems exemplify the theory.

  15. Kauai Groundwater Flow Model

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Nicole Lautze

    2015-01-01

    Groundwater flow model for Kauai. Data is from the following sources: Whittier, R. and A.I. El-Kadi. 2014. Human and Environmental Risk Ranking of Onsite Sewage Disposal Systems For the Hawaiian Islands of Kauai, Molokai, Maui, and Hawaii – Final. Prepared by the University of Hawaii, Dept. of Geology and Geophysics for the State of Hawaii Dept. of Health, Safe Drinking Water Branch. September 2014.; and Whittier, R.B., K. Rotzoll, S. Dhal, A.I. El-Kadi, C. Ray, G. Chen, and D. Chang. 2004. Hawaii Source Water Assessment Program Report – Volume IV – Island of Kauai Source Water Assessment Program Report. Prepared for the Hawaii Department of Health, Safe Drinking Water Branch. University of Hawaii, Water Resources Research Center. Updated 2015.

  16. Determination of Bulk Dimensional Variation in Castings

    SciTech Connect (OSTI)

    Dr. James F. Cuttino Dr. Edward P. Morse

    2005-04-14

    The purpose of this work is to improve the efficiency of green sand foundries so that they may continue to compete as the most cost-effective method of fabrication while meeting tightening constraints on near-net shape manufacturing. In order to achieve this objective, the study is divided into two major components. The first component concentrated on identifying which processes control surface finish on the castings and which provide potential reductions in variations. The second component identified metrological methods that effectively discern between the geometry of bulk material versus surface finish in order to more accurately determine the quality of a part. The research resulted in the determination of an empirical relationship relating pouring parameters to dimensional variation, with an R2 value of greater than 0.79. A significant difference in variations obtained from vertical vs. horizontal molding machines was also noticed. When analyzed separately, however, the resulting empirical relationships for horizontal and vertical machines had reduced R2 values, probably due to the reduced data sets. Significant parameters when considering vertical and horizontal molding machines together included surface roughness, pattern type, iron type, pouring rate, copper content, amount of Western Bentonite, and permeability.

  17. Non--Atomic Components of Data Flow Diagrams: Stores, Persistent Flows,

    E-Print Network [OSTI]

    Symanzik, Jürgen

    Non--Atomic Components of Data Flow Diagrams: Stores, Persistent Flows, and Tests for Empty Flows J NON--ATOMIC COMPONENTS OF DATA FLOW DIAGRAMS: STORES, PERSISTENT FLOWS, AND TESTS FOR EMPTY FLOWS of these common features of traditional Data Flow Diagrams elevates the expressive power of FDFD's, or whether

  18. Temporally and spatially resolved characterization of microwave induced argon plasmas: Experiment and modeling

    SciTech Connect (OSTI)

    Baeva, M., E-mail: baeva@inp-greifswald.de; Andrasch, M.; Ehlbeck, J.; Loffhagen, D.; Weltmann, K.-D. [INP Greifswald, Felix-Hausdorff-Str. 2, 17489 Greifswald (Germany)

    2014-04-14

    Experiments and modeling of the plasma-microwave interaction have been performed in a coaxial microwave plasma source at a field frequency of 2.45 GHz generating argon plasmas at pressures of 20 and 40 millibars and a ratio of flow rate to pressure of 0.125 sccm/Pa. The incident microwave power between 100?W and 300?W is supplied in a regime of a pulse-width modulation with cycle duration of 110?ms and a power-on time of 23?ms. The experiments are based on heterodyne reflectometry and microwave interferometry at 45.75?GHz. They provide the temporal behaviour of the complex reflection coefficient, the microwave power in the plasma, as well as the electron density in the afterglow zone of the discharge. The self-consistent spatially two-dimensional and time-dependent modeling complements the analysis of the plasma-microwave interaction delivering the plasma and electromagnetic field parameters. The consolidating experimental observations and model predictions allow further characterizing the plasma source. The generated plasma has a core occupying the region close to the end of the inner electrode, where maximum electron densities above 10{sup 20}?m{sup ?3} and electron temperatures of about 1?eV are observed. Due to a longer outer electrode of the coaxial structure, the plasma region is extended and fills the volume comprised by the outer electrode. The electron density reaches values of the order of 10{sup 19}?m{sup ?3}. The heating of the gas occurs in its great part due to elastic collisions with the plasma electrons. However, the contribution of the convective heating is important especially in the extended plasma region, where the gas temperature reaches its maximum values up to approximately 1400?K. The temporally and spatially resolved modeling enables a thorough investigation of the plasma-microwave interaction which clearly shows that the power in-coupling occurs in the region of the highest electron density during the early stage of the discharge. In the steady state phase, however, the power in-coupling occurs close to the source walls where the electron density is significantly lower than on the discharge axis.

  19. Induced defect nucleation and side-band instabilities in hexagons with rotation and mean flow

    E-Print Network [OSTI]

    Yuan-Nan Young; Hermann Riecke

    2002-07-30

    The combined effect of mean flow and rotation on hexagonal patterns is investigated using Ginzburg-Landau equations that include nonlinear gradient terms as well as the nonlocal coupling provided by the mean flow. Long-wave and short-wave side-band instabilities are determined. Due to the nonlinear gradient terms and enhanced by the mean flow, the penta-hepta defects can become unstable to the induced nucleation of dislocations in the defect-free amplitude, which can lead to the proliferation of penta-hepta defects and persistent spatio-temporal chaos. For individual penta-hepta defects the nonlinear gradient terms enhance climbing or gliding motion, depending on whether they break the chiral symmetry or not.

  20. Large Matched-Index-of-Refraction (MIR) Flow Systems for International Collaboration In Fluid Mechanics

    SciTech Connect (OSTI)

    Donald M. McEligot; Stefan Becker; Hugh M. McIlroy, Jr.

    2010-07-01

    In recent international collaboration, INL and Uni. Erlangen have developed large MIR flow systems which can be ideal for joint graduate student education and research. The benefit of the MIR technique is that it permits optical measurements to determine flow characteristics in complex passages and around objects to be obtained without locating a disturbing transducer in the flow field and without distortion of the optical paths. The MIR technique is not new itself; others employed it earlier. The innovation of these MIR systems is their large size relative to previous experiments, yielding improved spatial and temporal resolution. This report will discuss the benefits of the technique, characteristics of the systems and some examples of their applications to complex situations. Typically their experiments have provided new fundamental understanding plus benchmark data for assessment and possible validation of computational thermal fluid dynamic codes.

  1. Power flow tracing in a simplified highly renewable European electricity network

    E-Print Network [OSTI]

    Tranberg, Bo; Rodriguez, Rolando A; Andresen, Gorm B; Schäfer, Mirko; Greiner, Martin

    2015-01-01

    The increasing transmission capacity needs in a future energy system raise the question how associated costs should be allocated to the users of a strengthened power grid. In contrast to straightforward oversimplified methods, a flow tracing based approach provides a fair and consistent nodal usage and thus cost assignment of transmission investments. This technique follows the power flow through the network and assigns the link capacity usage to the respective sources or sinks using a diffusion-like process, thus taking into account the underlying network structure and injection pattern. As a showcase, we apply power flow tracing to a simplified model of the European electricity grid with a high share of renewable wind and solar power generation, based on long-term weather and load data with an hourly temporal resolution.

  2. Numerical simulation of water flow around a rigid fishing net

    E-Print Network [OSTI]

    Roger Lewandowski; Géraldine Pichot

    2006-12-20

    This paper is devoted to the simulation of the flow around and inside a rigid axisymmetric net. We describe first how experimental data have been obtained. We show in detail the modelization. The model is based on a Reynolds Averaged Navier-Stokes turbulence model penalized by a term based on the Brinkman law. At the out-boundary of the computational box, we have used a "ghost" boundary condition. We show that the corresponding variational problem has a solution. Then the numerical scheme is given and the paper finishes with numerical simulations compared with the experimental data.

  3. Data-flow algorithms for parallel matrix computations

    SciTech Connect (OSTI)

    O'Leary, D.P.; Stewart, G.W.

    1985-08-01

    This document develops some algorithms and tools for solving matrix problems on parallel-processing computers. Operations are synchronized through data-flow alone, which makes global synchronization unnecessary and enables the algorithms to be implemented on machines with very simple operating systems and communication protocols. As examples, the authors present algorithms that form the main modules for solving Liapounov matrix equations. They compare this approach to wave-front array processors and systolic arrays, and note its advantages in handling mis-sized problems, in evaluating variations of algorithms or architectures, in moving algorithms from system to system, and in debugging parallel algorithms on sequential machines.

  4. Spectro-temporal shaping of seeded free-electron laser pulses

    E-Print Network [OSTI]

    Gauthier, David; De Ninno, Giovanni; Allaria, Enrico; Cinquegrana, Paolo; Danailov, Miltcho Boyanov; Demidovich, Alexander; Ferrari, Eugenio; Giannessi, Luca; Mahieu, Benoît; Penco, Giuseppe

    2015-01-01

    We demonstrate the ability to control and shape the spectro-temporal content of extreme-ultraviolet (XUV) pulses produced by a seeded free-electron laser (FEL). The control over the spectro-temporal properties of XUV light was achieved by precisely manipulating the linear frequency chirp of the seed laser. Our results agree with existing theory, which allows retrieving the temporal properties (amplitude and phase) of the FEL pulse from measurements of the spectra as a function of the FEL operating parameters. Furthermore, we show the first direct evidence of the full temporal coherence of FEL light and generate Fourier limited pulses by fine-tuning the FEL temporal phase. The possibility to tailor the spectro-temporal content of intense short-wavelength pulses represents the first step towards efficient nonlinear optics in the XUV to X-ray spectral region and will enable precise manipulation of core-electron excitations using the methods of coherent quantum control.

  5. Detection and quantitation of single nucleotide polymorphisms, DNA sequence variations, DNA mutations, DNA damage and DNA mismatches

    DOE Patents [OSTI]

    McCutchen-Maloney, Sandra L. (Pleasanton, CA)

    2002-01-01

    DNA mutation binding proteins alone and as chimeric proteins with nucleases are used with solid supports to detect DNA sequence variations, DNA mutations and single nucleotide polymorphisms. The solid supports may be flow cytometry beads, DNA chips, glass slides or DNA dips sticks. DNA molecules are coupled to solid supports to form DNA-support complexes. Labeled DNA is used with unlabeled DNA mutation binding proteins such at TthMutS to detect DNA sequence variations, DNA mutations and single nucleotide length polymorphisms by binding which gives an increase in signal. Unlabeled DNA is utilized with labeled chimeras to detect DNA sequence variations, DNA mutations and single nucleotide length polymorphisms by nuclease activity of the chimera which gives a decrease in signal.

  6. Renormalization of the Polyakov loop with gradient flow

    E-Print Network [OSTI]

    P. Petreczky; H. -P. Schadler

    2015-11-24

    We use the gradient flow for the renormalization of the Polyakov loop in various representations. Using 2+1 flavor QCD with highly improved staggered quarks and lattices with temporal extents of $N_\\tau=6$, $8$, $10$ and $12$ we calculate the renormalized Polyakov loop in many representations including fundamental, sextet, adjoint, decuplet, 15-plet, 24-plet and 27-plet. This approach allows for the calculations of the renormalized Polyakov loops over a large temperature range from $T=116$ MeV up to $T=815$ MeV, with small errors not only for the Polyakov loop in fundamental representation, but also for the Polyakov loops in higher representations. We compare our results with standard renormalization schemes and discuss the Casimir scaling of the Polyakov loops.

  7. Fluctuations around Bjorken Flow and the onset of turbulent phenomena

    E-Print Network [OSTI]

    Floerchinger, Stefan

    2011-01-01

    We study how fluctuations in fluid dynamic fields can be dissipated or amplified within the characteristic spatio-temporal structure of a heavy ion collision. The initial conditions for a fluid dynamic evolution of heavy ion collisions may contain significant fluctuations in all fluid dynamical fields, including the velocity field and its vorticity components. We formulate and analyze the theory of local fluctuations around average fluid fields described by Bjorken's model. For conditions of laminar flow, when a linearized treatment of the dynamic evolution applies, we discuss explicitly how fluctuations of large wave number get dissipated while modes of sufficiently long wave-length pass almost unattenuated or can even be amplified. In the opposite case of large Reynold's numbers (which is inverse to viscosity), we establish that (after suitable coordinate transformations) the dynamics is governed by an evolution equation of non-relativistic Navier-Stokes type that becomes essentially two-dimensional at late...

  8. The propagation of kinetic energy across scales in turbulent flows

    E-Print Network [OSTI]

    Cardesa, José I; Dong, Siwei; Jiménez, Javier

    2015-01-01

    A temporal study of energy transfer across length scales is performed in 3D numerical simulations of homogeneous shear flow and isotropic turbulence, at Reynolds numbers in the range $Re_{\\lambda}=107-384$. The average time taken by perturbations in the energy flux to travel between scales is measured and shown to be additive, as inferred from the agreement between the total travel time from a given scale to the smallest dissipative motions, and the time estimated from successive jumps through intermediate scales. Our data suggests that the propagation of disturbances in the energy flux is independent of the forcing and that it defines a `velocity' that determines the energy flux itself. These results support that the cascade is, on average, a scale-local process where energy is continuously transmitted from one scale to the next in order of decreasing size.

  9. Redox Flow Batteries, a Review

    SciTech Connect (OSTI)

    U. Tennessee Knoxville; U. Texas Austin; McGill U; Weber, Adam Z.; Mench, Matthew M.; Meyers, Jeremy P.; Ross, Philip N.; Gostick, Jeffrey T.; Liu, Qinghua

    2011-07-15

    Redox flow batteries are enjoying a renaissance due to their ability to store large amounts of electrical energy relatively cheaply and efficiently. In this review, we examine the components of redox flow batteries with a focus on understanding the underlying physical processes. The various transport and kinetic phenomena are discussed along with the most common redox couples.

  10. Mean Curvature Driven Ricci Flow

    E-Print Network [OSTI]

    Victor Tapia

    2009-03-11

    We obtain the evolution equations for the Riemann tensor, the Ricci tensor and the scalar curvature induced by the mean curvature flow. The evolution for the scalar curvature is similar to the Ricci flow, however, negative, rather than positive, curvature is preserved. Our results are valid in any dimension.

  11. FLOW CONDITIONING DESIGN IN TURBULENT

    E-Print Network [OSTI]

    California at San Diego, University of

    , or liquid sheets, create protective pocket to shield chamber side walls · Lattice of stationary sheets shield front/back walls while allowing beam propagation and target injection (High-Yield Lithium conditioner configurations #12;5 Flow Loop A Pump H 400 gal tank B Bypass line I Butterfly valve C Flow meter

  12. Network Flow Optimization under Uncertainty

    E-Print Network [OSTI]

    Tesfatsion, Leigh

    , production, generation, transportation, trade, storage injections and withdrawals of coal, gas?) xij is flow along arc (i, j), from node i to node j cij is cost per unit of flow along (i, j Network model in words Minimize the cost of satisfying demands for electric energy By: imports, exports

  13. Variational sequences, representation sequences and applications in physics

    E-Print Network [OSTI]

    M. Palese; O. Rossi; E. Winterroth; J. Musilova

    2015-08-07

    This paper is a review containing new original results on the finite order variational sequence and its different representations with emphasis on applications in the theory of variational symmetries and conservation laws in physics.

  14. Superspreading and the impact of individual variation on disease emergence

    E-Print Network [OSTI]

    Getz, Wayne M.

    1 Superspreading and the impact of individual variation on disease emergence Supplementary.................................................................................................................................. 4 1.1 Factors contributing to variation in infectiousness 2.2.2 Parameter estimation from mean and proportion of zeros .................................... 8

  15. Variational sequences, representation sequences and applications in physics

    E-Print Network [OSTI]

    M. Palese; O. Rossi; E. Winterroth; J. Musilova

    2015-09-21

    This paper is a review containing new original results on the finite order variational sequence and its different representations with emphasis on applications in the theory of variational symmetries and conservation laws in physics.

  16. Statistical static timing analysis considering process variations and crosstalk 

    E-Print Network [OSTI]

    Veluswami, Senthilkumar

    2005-11-01

    Increasing relative semiconductor process variations are making the prediction of realistic worst-case integrated circuit delay or sign-off yield more difficult. As process geometries shrink, intra-die variations have ...

  17. Variations in the manufacturing of Rockwell test blocks

    E-Print Network [OSTI]

    Vora, Jairaj Deepak

    2009-01-01

    This research analyzes the variations occurring in the manufacturing of Rockwell hardness test blocks. Test blocks of different materials and hardness were analyzed and the variations were identified using the Ishikawa ...

  18. The dynamics of genetic and morphological variation on volcanic islands

    E-Print Network [OSTI]

    Thorpe, Roger Stephen

    : volcanism; phylogeography; geographical variation; natural selection; Canary islands; Tarentola 1 and Canary islands). It has been argued that population extinctions, recolonizations and associ- ated a role in shaping geographical variation. The islands of the Canary Archipelago provide an excellent

  19. Vertical flow chemical detection portal

    DOE Patents [OSTI]

    Linker, Kevin L. (Albuquerque, NM); Hannum, David W. (Albuquerque, NM); Conrad, Frank James (Russellville, SC)

    1999-01-01

    A portal apparatus for screening objects or persons for the presence of trace amounts of chemical substances such as illicit drugs or explosives. The apparatus has a test space, in which a person may stand, defined by two generally upright sides spanned by a horizontal transom. One or more fans in the transom generate a downward air flow (uni-directional) within the test space. The air flows downwardly from a high pressure upper zone, past the object or person to be screened. Air moving past the object dislodges from the surface thereof both volatile and nonvolatile particles of the target substance. The particles are entrained into the air flow which continues flowing downward to a lower zone of reduced pressure, where the particle-bearing air stream is directed out of the test space and toward preconcentrator and detection components. The sides of the portal are specially configured to partially contain and maintain the air flow.

  20. Vertical flow chemical detection portal

    DOE Patents [OSTI]

    Linker, K.L.; Hannum, D.W.; Conrad, F.J.

    1999-06-22

    A portal apparatus is described for screening objects or persons for the presence of trace amounts of chemical substances such as illicit drugs or explosives. The apparatus has a test space, in which a person may stand, defined by two generally upright sides spanned by a horizontal transom. One or more fans in the transom generate a downward air flow (uni-directional) within the test space. The air flows downwardly from a high pressure upper zone, past the object or person to be screened. Air moving past the object dislodges from the surface thereof both volatile and nonvolatile particles of the target substance. The particles are entrained into the air flow which continues flowing downward to a lower zone of reduced pressure, where the particle-bearing air stream is directed out of the test space and toward preconcentrator and detection components. The sides of the portal are specially configured to partially contain and maintain the air flow. 3 figs.

  1. Three-dimensional hippocampal atrophy maps distinguish two common temporal lobe

    E-Print Network [OSTI]

    Thompson, Paul

    Three-dimensional hippocampal atrophy maps distinguish two common temporal lobe seizure ictal onset patterns (Engel, 1990). Hyper- synchronous (HYP) onsets consist of long-lasting (>5-s

  2. The Importance of High Temporal Resolution in Modeling Renewable Energy Penetration Scenarios

    E-Print Network [OSTI]

    Nicolosi, Marco

    2011-01-01

    P. E. (2008): Wind Power in the Danish liberalized powereconomics of large-scale wind power in a carbon constraineddifferences. Keywords: Wind power integration, temporal-

  3. Two-dimensional spatio-temporal signal processing for dispersion compensation in time-stretched ADC

    E-Print Network [OSTI]

    Tarighat, Alireza; Gupta, Shalabh; Sayed, Ali H.; Jalali, Bahrain

    2007-01-01

    SPATIO-TEMPORAL SIGNAL PROCESSING [4] P. W. Juodawlkis, J.are in communication theory and signal processing, includingon Acoustics, Speech, and Signal Processing, 2008. Bahram

  4. Improving microbial fitness in the mammalian gut by in vivo temporal functional metagenomics

    E-Print Network [OSTI]

    Yaung, Stephanie J.

    Elucidating functions of commensal microbial genes in the mammalian gut is challenging because many commensals are recalcitrant to laboratory cultivation and genetic manipulation. We present Temporal FUnctional Metagenomics ...

  5. Flow rule of dense granular flows down a rough incline

    E-Print Network [OSTI]

    Tamas Borzsonyi; Robert E. Ecke

    2007-07-09

    We present experimental findings on the flow rule for granular flows on a rough inclined plane using various materials including sand and glass beads of various sizes and four types of copper particles with different shapes. We characterize the materials by measuring $h_s$ (the thickness at which the flow subsides) as a function of the plane inclination $\\theta$ on various surfaces. Measuring the surface velocity $u$ of the flow as a function of flow thickness $h$, we find that for sand and glass beads the Pouliquen flow rule $u/\\sqrt{gh} \\sim \\beta h/h_s$ provides reasonable but not perfect collapse of the $u(h)$ curves measured for various $\\theta$ and mean particle diameter $d$. Improved collapse is obtained for sand and glass beads by using a recently proposed scaling of the form $u/\\sqrt{gh} =\\beta \\cdot h \\tan^2\\theta /h_s\\ \\tan^2\\theta_1$ where $\\theta_1$ is the angle at which the $h_s(\\theta)$ curves diverge. Measuring the slope $\\beta$ for ten different sizes of sand and glass beads, we find a systematic, strong increase of $\\beta$ with the divergence angle $\\theta_1$ of $h_s$. The copper materials with different shapes are not well described by either flow rule with $u \\sim h^{3/2}$.

  6. Recurrent flow analysis in spatiotemporally chaotic 2-dimensional Kolmogorov flow

    E-Print Network [OSTI]

    Dan Lucas; Rich Kerswell

    2015-04-01

    Motivated by recent success in the dynamical systems approach to transitional flow, we study the efficiency and effectiveness of extracting simple invariant sets (recurrent flows) directly from chaotic/turbulent flows and the potential of these sets for providing predictions of certain statistics of the flow. Two-dimensional Kolmogorov flow (the 2D Navier-Stokes equations with a sinusoidal body force) is studied both over a square [0, 2{\\pi}]2 torus and a rectangular torus extended in the forcing direction. In the former case, an order of magnitude more recurrent flows are found than previously (Chandler & Kerswell 2013) and shown to give improved predictions for the dissipation and energy pdfs of the chaos via periodic orbit theory. Over the extended torus at low forcing amplitudes, some extracted states mimick the statistics of the spatially-localised chaos present surprisingly well recalling the striking finding of Kawahara & Kida (2001) in low-Reynolds-number plane Couette flow. At higher forcing amplitudes, however, success is limited highlighting the increased dimensionality of the chaos and the need for larger data sets. Algorithmic developments to improve the extraction procedure are discussed.

  7. Flow calculations for Yucca Mountain groundwater travel time (GWTT-95)

    SciTech Connect (OSTI)

    Altman, S.J.; Arnold, B.W.; Barnard, R.W.; Barr, G.E.; Ho, C.K.; McKenna, S.A.; Eaton, R.R.

    1996-09-01

    In 1983, high-level radioactive waste repository performance requirements related to groundwater travel time were defined by NRC subsystem regulation 10 CFR 60.113. Although DOE is not presently attempting to demonstrate compliance with that regulation, understanding of the prevalence of fast paths in the groundwater flow system remains a critical element of any safety analyses for a potential repository system at Yucca Mountain, Nevada. Therefore, this analysis was performed to allow comparison of fast-path flow against the criteria set forth in the regulation. Models developed to describe the conditions for initiation, propagation, and sustainability of rapid groundwater movement in both the unsaturated and saturated zones will form part of the technical basis for total- system analyses to assess site viability and site licensability. One of the most significant findings is that the fastest travel times in both unsaturated and saturated zones are in the southern portion of the potential repository, so it is recommended that site characterization studies concentrate on this area. Results support the assumptions regarding the importance of an appropriate conceptual model of groundwater flow and the incorporation of heterogeneous material properties into the analyses. Groundwater travel times are sensitive to variation/uncertainty in hydrologic parameters and in infiltration flux at upper boundary of the problem domain. Simulated travel times are also sensitive to poorly constrained parameters of the interaction between flow in fractures and in the matrix.

  8. Wavy flow cooling concept for turbine airfoils

    DOE Patents [OSTI]

    Liang, George (Palm City, FL)

    2010-08-31

    An airfoil including an outer wall and a cooling cavity formed therein. The cooling cavity includes a leading edge flow channel located adjacent a leading edge of the airfoil and a trailing edge flow channel located adjacent a trailing edge of the airfoil. Each of the leading edge and trailing edge flow channels define respective first and second flow axes located between pressure and suction sides of the airfoil. A plurality of rib members are located within each of the flow channels, spaced along the flow axes, and alternately extending from opposing sides of the flow channels to define undulating flow paths through the flow channels.

  9. A Variational Principle for Asymptotically Randall-Sundrum Black Holes

    E-Print Network [OSTI]

    Scott Fraser; Douglas M. Eardley

    2015-07-28

    We prove the following variational principle for asymptotically Randall-Sundrum (RS) black holes, based on the first law of black hole mechanics: Instantaneously static initial data that extremizes the mass yields a static black hole, for variations at fixed apparent horizon area, AdS curvature length, cosmological constant, brane tensions, and RS brane warp factors. This variational principle is valid with either two branes (RS1) or one brane (RS2), and is applicable to variational trial solutions.

  10. US energy flow - 1984

    SciTech Connect (OSTI)

    Briggs, C.K.; Borg, I.Y.

    1985-07-01

    The 1984 energy flow diagram for the USA has been constructed using Department of Energy data. It is a convenient graphical device to show supply and demand as well as the size of end-use sectors. A 4% increase in overall energy consumption represented a reversal in a downward trend started in 1979. All indicators pointed to more healthy industrial and farm economies in 1984 than in the previous two years, which accounted for some part of the increase in energy use. While domestic crude oil production remained stable, oil imports rose eight percent also reversing a long-standing trend. Seventy-two million barrels of oil primarily from Mexico and the United Kingdom were added to the Strategic Petroleum Reserve bringing the total oil stored at year end to 451 million barrels. At the same time 49 million barrels of oil were produced from the government-owned Naval Petroleum Reserve No. 1 (Elk Hills, CA). Energy use in all end-use sectors grew in 1984 which is in keeping with increases in use of all types of fossil fuels as well as electricity. Increase in electrical power demand continued to exceed forecasts, and during 1984 contracts for imports to the northeast US were negotiated with Canada. Nuclear power contributed 15% of total power generated in the US. At year end there were 86 licensed reactors and 44 in either start-up or construction stages. Six were canceled or abandoned during construction during the year. 11 refs., 4 figs., 3 tabs.

  11. ( sup 14 C)iodoantipyrine and microsphere blood flow estimates in cat brain

    SciTech Connect (OSTI)

    Schuier, F.J.; Jones, S.C.; Fedora, T.; Reivich, M. (Univ. of Pennsylvania, Philadelphia (USA))

    1987-11-01

    A comparison of local cerebral blood flow estimates with the microsphere and the 4-(N-methyl-{sup 14}C)iodoantipyrine (({sup 14}C)IAP) techniques has been performed in cats. Good correlation of ({sup 14}C)IAP with microsphere flow estimates in the gray matter was found. In the white matter, however, ({sup 14}C)IAP flow estimates were consistently lower than microsphere flow estimates. Error analysis of both techniques and comparison with previous studies suggest that peculiarities of white matter arterial vasculature with preferential microsphere accumulation may lead to this discrepancy. Microspheres did not interfere with flow as shown by the normal appearance of subsequent ({sup 14}C)IAP autoradiograms. The number of microspheres seen on autoradiograms was used for an estimate of microvessels blocked by spheres and found to be negligible. The study also demonstrates that ({sup 14}C)IAP is not diffusion limited up to the observed flow values of 2 ml {center dot} g{sup {minus}1} {center dot} min{sup {minus}1}. Both techniques might be used together for a combination of their respective advantages, which are temporal and spatial resolution for microsphere and ({sup 14}C)IAP, respectively.

  12. HYPERBOLIC SYSTEMS OF THREE-PHASE FLOW

    E-Print Network [OSTI]

    Patzek, Tadeusz W.

    HYPERBOLIC SYSTEMS OF THREE-PHASE FLOW IN POROUS MEDIA Gordon Conference on Flow and Transport SINTEF IKT, Dept. Applied Mathematics, Norway #12;2 WHY THREE-PHASE FLOW + Three-phase flow is the rule: ! Exceptionally accurate, fast numerical solutions to realistic three-phase flows in porous media + Approach

  13. Mathematical Model Analysis for Hg Flow

    E-Print Network [OSTI]

    McDonald, Kirk

    Mathematical Model Analysis for Hg Flow Yan Zhan SUNYSB April 20th, 2010 #12;Outline · Introduction ­ Mechanism of Jet Breakup & Atomization ­ Dynamic Problems in Hg Target Flow · Mathematical Model for Hg Flow ­ Parameters ­ Incompressible Flow (No MHD) ­ Incompressible Flow (MHD) ­ Proton Beam Energy Conversion

  14. Stochastic Power Grid Analysis Considering Process Variations Praveen Ghanta

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Stochastic Power Grid Analysis Considering Process Variations Praveen Ghanta Sarma Vrudhula of interconnect and de- vice process variations on voltage fluctuations in power grids. We consider random variations in the power grid's electrical parame- ters as spatial stochastic processes and propose a new

  15. Summertime total ozone variations over middle and polar latitudes

    E-Print Network [OSTI]

    Wirosoetisno, Djoko

    Summertime total ozone variations over middle and polar latitudes Article Published Version Fioletov, V. E. and Shepherd, T. G. (2005) Summertime total ozone variations over middle and polar's research outputs online #12;Summertime total ozone variations over middle and polar latitudes Vitali E

  16. Variations on a Theme Issue 8 

    E-Print Network [OSTI]

    Piacentini, Valerie; Clark, Sheila

    1984-01-01

    lot of the farm animals went wild, too, when the people left .. l1 "I'm not sure I like the sound of that," McCoy said dubiously. "Wild country, scattered population, possibly dangerous animals roaming around ... It "Just like Vulcan," k:irk said..., Sheila Clark, Valerie Piacentini Printing of masters - Janet Quartan Printing - Warped Out Publications Distracting - Shan a (Don't you get tired of playing with paper?) Var-iations on a Theme 8, in which Kirk and Spack find their leave less r...

  17. Variations on a Theme Issue 4 

    E-Print Network [OSTI]

    Piacentini, Valerie; Clark, Sheila

    1980-01-01

    and Sheila Clark covel' by Roo illustrations by Virginia Lee Smith Variations on a Theme 4, priCG ?1. 25 inside the U.K., is put out by the ST!,H 'mEK Action Group and is available from Sheila Clark 6 Craig111ill Cottages Strathmartino by Dundee... Scotland. Foreign rates - \\\\6.00 US airmail, $3.50 surface (?2.50 airmail, ?1.50 surface) Australia, ?2.75 airmail, ?1.50 surface Europe, ?1.50. If you pay by dollar cheque, bank draft, please add $1.00 per total order to cover bank charges. STAG...

  18. ANTI-PARALLEL EUV FLOWS OBSERVED ALONG ACTIVE REGION FILAMENT THREADS WITH HI-C

    SciTech Connect (OSTI)

    Alexander, Caroline E.; Walsh, Robert W.; Régnier, Stéphane; Cirtain, Jonathan; Winebarger, Amy R.; Golub, Leon; Korreck, Kelly; Weber, Mark; Kobayashi, Ken; Platt, Simon; Mitchell, Nick; DePontieu, Bart; Title, Alan; DeForest, Craig; Kuzin, Sergey

    2013-09-20

    Plasma flows within prominences/filaments have been observed for many years and hold valuable clues concerning the mass and energy balance within these structures. Previous observations of these flows primarily come from H? and cool extreme-ultraviolet (EUV) lines (e.g., 304 Å) where estimates of the size of the prominence threads has been limited by the resolution of the available instrumentation. Evidence of 'counter-steaming' flows has previously been inferred from these cool plasma observations, but now, for the first time, these flows have been directly imaged along fundamental filament threads within the million degree corona (at 193 Å). In this work, we present observations of an AR filament observed with the High-resolution Coronal Imager (Hi-C) that exhibits anti-parallel flows along adjacent filament threads. Complementary data from the Solar Dynamics Observatory (SDO)/Atmospheric Imaging Assembly (AIA) and Helioseismic and Magnetic Imager are presented. The ultra-high spatial and temporal resolution of Hi-C allow the anti-parallel flow velocities to be measured (70-80 km s{sup –1}) and gives an indication of the resolvable thickness of the individual strands (0.''8 ± 0.''1). The temperature of the plasma flows was estimated to be log T (K) = 5.45 ± 0.10 using Emission Measure loci analysis. We find that SDO/AIA cannot clearly observe these anti-parallel flows or measure their velocity or thread width due to its larger pixel size. We suggest that anti-parallel/counter-streaming flows are likely commonplace within all filaments and are currently not observed in EUV due to current instrument spatial resolution.

  19. Spatio-temporal characteristics of Trichel pulse at low pressure

    SciTech Connect (OSTI)

    He, Shoujie, E-mail: hedajingdian@126.com [College of Physics Science and Technology, Hebei University, Baoding (China)] [College of Physics Science and Technology, Hebei University, Baoding (China); Jing, Ha [Institute of Science, Hebei Agriculture University, Baoding (China)] [Institute of Science, Hebei Agriculture University, Baoding (China)

    2014-01-15

    Trichel pulses are investigated using a needle-to-plane electrode geometry at low pressure. The evolution of current and voltage, the spatio-temporal discharge images of Trichel pulse are measured. The rising time and duration time in a pulse are about 10??s and several tens of microseconds, respectively. One period of pulse can be divided into three stages: the stage preceding cathode breakdown, cathode glow formation, and discharge decaying process. Besides a cathode glow and a dark space, an anode glow is also observed. The emission spectra mainly originate from the C{sup 3}?{sub u} ? B{sup 3}?{sub g} transition for nitrogen. In addition, the capacitances in parallel connected with the discharge cell have important influence on the pulsing frequency.

  20. Turbine blade tip flow discouragers

    DOE Patents [OSTI]

    Bunker, Ronald Scott (Niskayuna, NY)

    2000-01-01

    A turbine assembly comprises a plurality of rotating blade portions in a spaced relation with a stationery shroud. The rotating blade portions comprise a root section, a tip portion and an airfoil. The tip portion has a pressure side wall and a suction side wall. A number of flow discouragers are disposed on the blade tip portion. In one embodiment, the flow discouragers extend circumferentially from the pressure side wall to the suction side wall so as to be aligned generally parallel to the direction of rotation. In an alternative embodiment, the flow discouragers extend circumferentially from the pressure side wall to the suction side wall so as to be aligned at an angle in the range between about 0.degree. to about 60.degree. with respect to a reference axis aligned generally parallel to the direction of rotation. The flow discouragers increase the flow resistance and thus reduce the flow of hot gas flow leakage for a given pressure differential across the blade tip portion so as to improve overall turbine efficiency.

  1. The transition from two phase bubble flow to slug flow

    E-Print Network [OSTI]

    Radovcich, Nick A.

    1962-01-01

    The process of transition from bubble to slug flow in a vertical pipe has been studied analytically and experimentally. An equation is presented which gives the agglomeration time as a function of void fraction, channel ...

  2. Variational Calculations of Positronium Scattering with Hydrogen

    E-Print Network [OSTI]

    Woods, Denton

    2015-01-01

    Positronium-hydrogen (Ps-H) scattering is of interest, as it is a fundamental four-body Coulomb problem. We have investigated low-energy Ps-H scattering below the Ps(n=2) excitation threshold using the Kohn variational method and variants of the method with a trial wavefunction that includes highly correlated Hylleraas-type short-range terms. We give an elegant formalism that combines all Kohn-type variational methods into a single form. Along with this, we have also developed a general formalism for Kohn-type matrix elements that allows us to evaluate arbitrary partial waves with a single codebase. Computational strategies we have developed and use in this work are also discussed. With these methods, we have computed phase shifts for the first six partial waves for both the singlet and triplet states. The $^{1,3}$S and $^{1,3}$P phase shifts are highly accurate results and could potentially be viewed as benchmark results. Resonance positions and widths for the $^1$S-, $^1$P-, $^1$D-, and $^1$F-waves have bee...

  3. BPS dyons and Hesse flow

    E-Print Network [OSTI]

    Dieter Van den Bleeken

    2012-02-03

    We revisit BPS solutions to classical N=2 low energy effective gauge theories. It is shown that the BPS equations can be solved in full generality by the introduction of a Hesse potential, a symplectic analog of the holomorphic prepotential. We explain how for non-spherically symmetric, non-mutually local solutions, the notion of attractor flow generalizes to gradient flow with respect to the Hesse potential. Furthermore we show that in general there is a non-trivial magnetic complement to this flow equation that is sourced by the momentum current in the solution.

  4. Transient eddy current flow metering

    E-Print Network [OSTI]

    Forbriger, Jan

    2015-01-01

    Measuring local velocities or entire flow rates in liquid metals or semiconductor melts is a notorious problem in many industrial applications, including metal casting and silicon crystal growth. We present a new variant of an old technique which relies on the continuous tracking of a flow-advected transient eddy current that is induced by a pulsed external magnetic field. This calibration-free method is validated by applying it to the velocity of a spinning disk made of aluminum. First tests at a rig with a flow of liquid GaInSn are also presented.

  5. The Ricci Flow on Riemannian Groupoids

    E-Print Network [OSTI]

    Hilaire, Christian

    2015-01-01

    3.2 Application: Immortal Ricci flow solutions on closedand Dan Knopf. The Ricci flow: an introduction. Vol. 110.and Lei Ni. Hamilton’s Ricci flow. Vol. 77. Graduate Studies

  6. Insertable fluid flow passage bridgepiece and method

    DOE Patents [OSTI]

    Jones, Daniel O. (Glenville, NV)

    2000-01-01

    A fluid flow passage bridgepiece for insertion into an open-face fluid flow channel of a fluid flow plate is provided. The bridgepiece provides a sealed passage from a columnar fluid flow manifold to the flow channel, thereby preventing undesirable leakage into and out of the columnar fluid flow manifold. When deployed in the various fluid flow plates that are used in a Proton Exchange Membrane (PEM) fuel cell, bridgepieces of this invention prevent mixing of reactant gases, leakage of coolant or humidification water, and occlusion of the fluid flow channel by gasket material. The invention also provides a fluid flow plate assembly including an insertable bridgepiece, a fluid flow plate adapted for use with an insertable bridgepiece, and a method of manufacturing a fluid flow plate with an insertable fluid flow passage bridgepiece.

  7. Cash Flow Projection for Operating Loan Determination 

    E-Print Network [OSTI]

    Klinefelter, Danny A.; McCorkle, Dean

    2009-02-04

    A cash flow statement is simply a record of the dollars coming in and the dollars going out of a business. This publication briefly discusses cash flow and gives a cash flow projection for operating loan determination.

  8. Flow field computation of the NREL S809 airfoil using various turbulence models

    SciTech Connect (OSTI)

    Chang, Y.L.; Yang, S.L.; Arici, O. [Michigan Technological Univ., Houghton, MI (United States). Mechanical Engineering-Engineering Mechanics Dept.

    1996-10-01

    Performance comparison of three popular turbulence models, namely Baldwin-Lomas algebraic model, Chien`s Low-Reynolds-Number {kappa}-{epsilon} model, and Wilcox`s Low-Reynolds-Number {kappa}-{omega} model, is given. These models were applied to calculate the flow field around the National Renewable Energy Laboratory S809 airfoil using Total Variational Diminishing scheme. Numerical results of C{sub P}, C{sub L}, and C{sub D} are presented along with the Delft experimental data. It is shown that all three models perform well for attached flow, i.e., no flow separation at low angles of attack. However, at high angles of attack with flow separation, convergence characteristics show Wilcox`s model outperforms the other models. Results of this study will be used to guide the authors in their dynamic stall research.

  9. Estimating mutation parameters, population history and genealogy simultaneously from temporally spaced

    E-Print Network [OSTI]

    Nicholls, Geoff

    Estimating mutation parameters, population history and genealogy simultaneously from temporally and population size that incorporates the uncertainty in the genealogy of such temporally spaced sequences features of this approach on a genealogy of HIV-1 envelope (env) partial sequences. #12;1 Introduction One

  10. Long-range temporal correlations of ocean surface currents Yosef Ashkenazy1

    E-Print Network [OSTI]

    Ashkenazy, Yossi "Yosef"

    Long-range temporal correlations of ocean surface currents Yosef Ashkenazy1 and Hezi Gildor2 of ocean surface currents, J. Geophys. Res., 114, C09009, doi:10.1029/2008JC005235. 1. Introduction [2 study the temporal correlations of sea surface currents at the Gulf of Eilat (also known as Gulf

  11. Experimental quiescent drifting dusty plasmas and temporal dust acoustic wave growth

    E-Print Network [OSTI]

    Merlino, Robert L.

    Experimental quiescent drifting dusty plasmas and temporal dust acoustic wave growth J. R. Heinrich quiescent drifting dusty plasmas and temporal dust acoustic wave growth J. R. Heinrich, S.-H. Kim, J. K report on dust acoustic wave growth rate measurements taken in a dc (anode glow) discharge plasma device

  12. Fast Gradient-Descent Methods for Temporal-Difference Learning with Linear Function Approximation

    E-Print Network [OSTI]

    Szepesvari, Csaba

    Fast Gradient-Descent Methods for Temporal-Difference Learning with Linear Function Approximation with both linear function ap- proximation and off-policy training, and whose complexity scales only linearly requirements. 1. Motivation Temporal-difference methods based on gradient descent and linear function

  13. Challenges for Temporal Planning with Uncertain Durations Mausam and Daniel S. Weld

    E-Print Network [OSTI]

    Challenges for Temporal Planning with Uncertain Durations Mausam and Daniel S. Weld Dept of Computer Science and Engineering University of Washington Seattle, WA-98195 {mausam,weld temporal model is used in TGP (Smith & Weld 1999). TGP-style actions require preconditions to be true

  14. Autologistic Regression Analysis of Spatial-Temporal Binary Data via Monte Carlo

    E-Print Network [OSTI]

    Aukema, Brian

    Autologistic Regression Analysis of Spatial-Temporal Binary Data via Monte Carlo Maximum Likelihood regression analysis of binary data that are measured on a spatial lattice and repeatedly over discrete time points. We propose a spatial- temporal autologistic regression model and draw statistical inference via

  15. Spatial and Temporal Distribution of the Vibrionaceae in Coastal Waters of Hawaii, Australia, and France

    E-Print Network [OSTI]

    Ruby, Edward G.

    Microbial Ecology Spatial and Temporal Distribution of the Vibrionaceae in Coastal Waters of Hawaii and temporal distribution of the Vibrionaceae with respect to V. fischeri and V. logei in Hawaii, southeastern (temperature) and biotic (host distribution) factors both influence popula- tion dynamics. In Hawaii, three

  16. Reconstruction of Missing Data in Social Networks Based on Temporal Patterns of Interactions

    E-Print Network [OSTI]

    Bertozzi, Andrea L.

    Reconstruction of Missing Data in Social Networks Based on Temporal Patterns of Interactions Alexey events in the future. Such event #12;Reconstruction of Missing Data Based on Temporal Patterns 2 the missing data about the participants based on the behavioral model. t t t Figure 2. Graphical

  17. Reconstruction of Missing Data in Social Networks Based on Temporal Patterns of Interactions

    E-Print Network [OSTI]

    Soatto, Stefano

    Reconstruction of Missing Data in Social Networks Based on Temporal Patterns of Interactions Alexey events in the future. Such event #12;Reconstruction of Missing Data Based on Temporal Patterns 2 Angeles E-mail: alexey@math.ucla.edu, mbshort@math.ucla.edu, bertozzi@math.ucla.edu Abstract. We discuss

  18. Radiation dose reduction in computed tomography perfusion using spatial-temporal Bayesian methods

    E-Print Network [OSTI]

    Chen, Tsuhan

    in mean-square-error (MSE) of 40% at low dose radiation of 43mA. Keywords: spatial-temporal, BayesianRadiation dose reduction in computed tomography perfusion using spatial-temporal Bayesian methods-ray radiation dose is of significant concern to patients and operators, especially CT perfusion (CTP) imaging

  19. EXEMPLAR-BASED UNIT SELECTION FOR VOICE CONVERSION UTILIZING TEMPORAL INFORMATION

    E-Print Network [OSTI]

    Virtanen, Tuomas

    EXEMPLAR-BASED UNIT SELECTION FOR VOICE CONVERSION UTILIZING TEMPORAL INFORMATION Zhizheng Wu1 methods. Index Terms-- Voice conversion, unit selection, multi-frame exemplar, temporal information 1 shown to play an important role in perception, most of the voice conversion ap- proaches assume

  20. Passive spatial and temporal integration of excitatory synaptic inputs in cerebellar Purkinje cells of young rats

    E-Print Network [OSTI]

    Passive spatial and temporal integration of excitatory synaptic inputs in cerebellar Purkinje cells linearly independent of the spatial and temporal separation of inputs. Summation of inputs in a passive. Keywords: Dendritic integration; Parallel fiber; Excitation; Timing; Synchrony; Rat Based on a passive

  1. Temporal Relations in Geographic Information Systems: A Workshop at the University of Maine,

    E-Print Network [OSTI]

    California at Santa Barbara, University of

    Temporal Relations in Geographic Information Systems: A Workshop at the University of Maine, Orono and Analysis Report 91-4 #12;Abstract A workshop on temporal relations in Geographic Information Systems (GIS of Surveying Engineering University of Maine Orono, ME 04469 National Center for Geographic Information

  2. Spatial-temporal mesoscale modelling of rainfall intensity using gage and radar data

    E-Print Network [OSTI]

    Reich, Brian J.

    values. We use spatial logistic regression to model the probability of rain for both sources of data modelling, spatial logistic regression, spatial temporal models. 1 #12;and allows the temporal evolution detailed spatial structure of rain fields is costly and their maintenance is time-consuming. Remote sensing

  3. Using the Context-enhanced Additive Heuristic for Temporal and Numeric Planning

    E-Print Network [OSTI]

    Vetter, Thomas

    , the main dif- ference lies in the heuristic: Sapa utilizes a temporal version of planning graphs firstUsing the Context-enhanced Additive Heuristic for Temporal and Numeric Planning Patrick Eyerich,mattmuel,roeger}@informatik.uni-freiburg.de Abstract Planning systems for real-world applications need the abil- ity to handle concurrency and numeric

  4. Spatio-TemporalDatabases in Practice: Directly Supporting Previously Developed Data using Tripod

    E-Print Network [OSTI]

    Paton, Norman

    University of Staffordshire UK 1 Introduction This demo presents a complete spatio-temporal object DBMS of fusion, fission or reallocation that must be catered for in tracking the life histories of individual The Tripod System The demo focuses on the benefits arising from use of a spatio-temporal DBMS on an important

  5. Managing Schema Evolution using a Temporal Object Model Iqbal A. Goralwalla, Duane Szafron, M. Tamer Ozsu

    E-Print Network [OSTI]

    Szafron, Duane

    of schema evolution and temporal support for many object database management systems applications can be used to investigate advanced database features such as schema evolution. GivenManaging Schema Evolution using a Temporal Object Model Iqbal A. Goralwalla, Duane Szafron, M

  6. The Temporal Dimension of Dynamic Function Allocation Michael Hildebrandt and Michael Harrison

    E-Print Network [OSTI]

    Harrison, Michael

    1 The Temporal Dimension of Dynamic Function Allocation Michael Hildebrandt and Michael Harrison.Harrison}@cs.york.ac.uk Abstract Current Dynamic Function Allocation methods are designed to switch adaptively between levels a temporal perspective on function allocation by discussing how functions can be scheduled on a joint human

  7. Greening Effect of Spatio-Temporal Power Sharing Policies in Cellular Networks with Energy Constraints

    E-Print Network [OSTI]

    Yi, Yung

    1 Greening Effect of Spatio-Temporal Power Sharing Policies in Cellular Networks with Energy greening, from which we first develop four IM schemes governed by different power sharing: no sharing, only the spatial and/or temporal power sharing policies, (ii) tighter greening regulation (i.e., smaller total

  8. Impact of Spatio-Temporal Power Sharing Policies on Cellular Network Greening

    E-Print Network [OSTI]

    Yi, Yung

    Impact of Spatio-Temporal Power Sharing Policies on Cellular Network Greening Jeongho Kwak, Kyuho in IM schemes on cellular network greening, where different spatio-temporal power sharing policies with greening, from which we first develop four IM schemes with different power sharing policies. Through

  9. Single-heartbeat electromechanical wave imaging with optimal strain estimation using temporally unequispaced acquisition sequences

    E-Print Network [OSTI]

    Konofagou, Elisa E.

    Single-heartbeat electromechanical wave imaging with optimal strain estimation using temporally-heartbeat electromechanical wave imaging with optimal strain estimation using temporally unequispaced acquisition sequences Published 1 February 2012 Online at stacks.iop.org/PMB/57/1095 Abstract Electromechanical Wave Imaging (EWI

  10. Identify Temporal Websites Based on User Behavior Analysis Yong Wang, Yiqun Liu,

    E-Print Network [OSTI]

    proportion of temporal pages are published by a small number of web sites providing news services, which temporal pages can be picked up with a small overhead of untemporal pages. With this method, web crawlers can focus on these web sites and download pages from them with high priority. 1 Introduction Many web

  11. An energy-momentum-conserving temporal discretization scheme for adhesive contact problems

    E-Print Network [OSTI]

    An energy-momentum-conserving temporal discretization scheme for adhesive contact problems Sachin S' knowledge, none have been proposed for adhesive contact problems. In this work, an energy-momentum-conserving temporal discretization scheme for adhesive contact problems is proposed. A contact criterion is also

  12. Intro Temporal Tests Declustering Methods Tests on SCEC data Spatiotemporal Test Discussion Testing for Poisson Behavior

    E-Print Network [OSTI]

    Stark, Philip B.

    Intro Temporal Tests Declustering Methods Tests on SCEC data Spatiotemporal Test Discussion Testing Seismological Society of America Annual Meeting San Diego, CA #12;Intro Temporal Tests Declustering Methods Tests on SCEC data Spatiotemporal Test Discussion Quake Physics versus Quake Statistics · Distribution

  13. Spatio-temporal availability of soft mast in clearcuts in the Southern Appalachians

    E-Print Network [OSTI]

    Mitchell, Mike

    Spatio-temporal availability of soft mast in clearcuts in the Southern Appalachians Melissa J availability of soft mast though time is not fully understood. We tested a theoretical model of temporal availability of soft mast in clearcuts using empirical data on percent cover and berry production

  14. Measuring marine fish biodiversity: temporal changes in abundance, life history and

    E-Print Network [OSTI]

    Hutchings, Jeffrey A.

    Measuring marine fish biodiversity: temporal changes in abundance, life history and demography, B3H 4J1 Canada Patterns in marine fish biodiversity can be assessed by quantifying temporal), sole (Solea solea) and pelagic sharks. Combining population data across regions and species, marine

  15. Spatio-temporal precipitation modeling based on time-varying regressions Oleg Makhnin

    E-Print Network [OSTI]

    Borchers, Brian

    Spatio-temporal precipitation modeling based on time-varying regressions Oleg Makhnin Department on monthly precipitation data from gauge measurements. The model accounts for orographic effects in northern New Mexico. We assess spatio-temporal variability and also trace the dependence of precipitation

  16. High speed flow cytometer droplet formation system and method

    DOE Patents [OSTI]

    Van den Engh, Ger (Seattle, WA)

    2000-01-01

    A droplet forming flow cytometer system allows high speed processing without the need for high oscillator drive powers through the inclusion of an oscillator or piezoelectric crystal such as within the nozzle volume or otherwise unidirectionally coupled to the sheath fluid. The nozzle container continuously converges so as to amplify unidirectional oscillations which are transmitted as pressure waves through the nozzle volume to the nozzle exit so as to form droplets from the fluid jet. The oscillator is directionally isolated so as to avoid moving the entire nozzle container so as to create only pressure waves within the sheath fluid. A variation in substance concentration is achieved through a movable substance introduction port which is positioned within a convergence zone to vary the relative concentration of substance to sheath fluid while still maintaining optimal laminar flow conditions. This variation may be automatically controlled through a sensor and controller configuration. A replaceable tip design is also provided whereby the ceramic nozzle tip is positioned within an edge insert in the nozzle body so as to smoothly transition from nozzle body to nozzle tip. The nozzle tip is sealed against its outer surface to the nozzle body so it may be removable for cleaning or replacement.

  17. Population genetic variation in gene expression is associated withphenotypic variation in Saccharomyces cerevisiae

    SciTech Connect (OSTI)

    Fay, Justin C.; McCullough, Heather L.; Sniegowski, Paul D.; Eisen, Michael B.

    2004-02-25

    The relationship between genetic variation in gene expression and phenotypic variation observable in nature is not well understood. Identifying how many phenotypes are associated with differences in gene expression and how many gene-expression differences are associated with a phenotype is important to understanding the molecular basis and evolution of complex traits. Results: We compared levels of gene expression among nine natural isolates of Saccharomyces cerevisiae grown either in the presence or absence of copper sulfate. Of the nine strains, two show a reduced growth rate and two others are rust colored in the presence of copper sulfate. We identified 633 genes that show significant differences in expression among strains. Of these genes,20 were correlated with resistance to copper sulfate and 24 were correlated with rust coloration. The function of these genes in combination with their expression pattern suggests the presence of both correlative and causative expression differences. But the majority of differentially expressed genes were not correlated with either phenotype and showed the same expression pattern both in the presence and absence of copper sulfate. To determine whether these expression differences may contribute to phenotypic variation under other environmental conditions, we examined one phenotype, freeze tolerance, predicted by the differential expression of the aquaporin gene AQY2. We found freeze tolerance is associated with the expression of AQY2. Conclusions: Gene expression differences provide substantial insight into the molecular basis of naturally occurring traits and can be used to predict environment dependent phenotypic variation.

  18. Drainage capture and discharge variations driven by glaciation in the Southern Alps, New Zealand

    SciTech Connect (OSTI)

    Ann V. Rowan; Mitchell A. Plummer; Simon H. Brocklehurst; Merren A. Jones; David M. Schultz

    2013-02-01

    Sediment flux in proglacial fluvial settings is primarily controlled by discharge, which usually varies predictably over a glacial–interglacial cycle. However, glaciers can flow against the topographic gradient to cross drainage divides, reshaping fluvial drainage networks and dramatically altering discharge. In turn, these variations in discharge will be recorded by proglacial stratigraphy. Glacial-drainage capture often occurs in alpine environments where ice caps straddle range divides, and more subtly where shallow drainage divides cross valley floors. We investigate discharge variations resulting from glacial-drainage capture over the past 40 k.y. for the adjacent Ashburton, Rangitata, and Rakaia basins in the Southern Alps, New Zealand. Although glacial-drainage capture has previously been inferred in the range, our numerical glacier model provides the first quantitative demonstration that this process drives larger variations in discharge for a longer duration than those that occur due to climate change alone. During the Last Glacial Maximum, the effective drainage area of the Ashburton catchment increased to 160% of the interglacial value with drainage capture, driving an increase in discharge exceeding that resulting from glacier recession. Glacial-drainage capture is distinct from traditional (base level–driven) drainage capture and is often unrecognized in proglacial deposits, complicating interpretation of the sedimentary record of climate change.

  19. Acoustic concentration of particles in fluid flow

    DOE Patents [OSTI]

    Ward, Michael D. (Los Alamos, NM); Kaduchak, Gregory (Los Alamos, NM)

    2010-11-23

    An apparatus for acoustic concentration of particles in a fluid flow includes a substantially acoustically transparent membrane and a vibration generator that define a fluid flow path therebetween. The fluid flow path is in fluid communication with a fluid source and a fluid outlet and the vibration generator is disposed adjacent the fluid flow path and is capable of producing an acoustic field in the fluid flow path. The acoustic field produces at least one pressure minima in the fluid flow path at a predetermined location within the fluid flow path and forces predetermined particles in the fluid flow path to the at least one pressure minima.

  20. Integrated Nozzle Flow, Spray, Combustion, & Emission Modeling...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Nozzle Flow, Spray, Combustion, & Emission Modeling using KH-ACT Primary Breakup Model & Detailed Chemistry Integrated Nozzle Flow, Spray, Combustion, & Emission Modeling using...