National Library of Energy BETA

Sample records for nutrient dynamics trace

  1. Nutrient dynamics and nitrogen trace gas flux during ecosystem development in montane rain forest

    SciTech Connect (OSTI)

    Riley, R.H.; Vitousek, P.M.

    1995-01-01

    Patterns of nitrogen trace gas emissions, soil nitrogen flux, and nutrient availability were evaluated at five sites that form a chronosequence in Hawaiian montane rain forest. The estimated age of basaltic parent material from which soils developed at the Kilauea site was 200 yr, 6000 yr at the Puu Makaala site, 185000 yr at the Kohala site, 1.65 x 10{sup 6} yr at the Molokai site, and 4.5 x 10{sup 6} yr at the Kauai site. Peak net N mineralization and nitrification values were found in soils from the 185000-yr-old Kohala site. Nitrogen content of foliage and leaf litter was highest in the intermediate age sites (Puu Makaala and Kohala) and N and P retranslocation was lowest at the Puu Makaala site. Soil cores fertilized with nitrogen had significantly higher rates of root ingrowth than control cores at the two youngest sites (200 and 6000 yr old) but not in older sites (185000 and 4.5 x 10{sup 6}-yr-old sites) and total fine root growth into control cores was greatest at the Kohala site. The highest N{sub 2}O emissions were found at the 185000-yr-old Kohala site, while the highest combined flux of N{sub 2}O + NO was observed at the 4.5 x 10{sup 6}-yr-old Kauai site. While overall N{sub 2}O emission rates were correlated with rates of N transformations, soil water content appeared to influence the magnitude of emissions of N{sub 2}O and the ratios of emissions of NO vs. N{sub 2}O. N{sub 2}O emissions occurred when water-filled pore space (WFPS) values were >40%, with highest emissions in at least two sites observed at WFPS values of 75%. Among sites, high N{sub 2}O emissions were associated with high soil N transformation rates. Large NO fluxes were observed only at the Kauai site when WFPS values were <60%. 50 refs., 8 figs., 4 tabs.

  2. Trace Elements Greg Mullins, Extension Nutrient Management Specialist, Virginia Tech

    E-Print Network [OSTI]

    Liskiewicz, Maciej

    the plants. Manganese (Mn) Manganese deficiency has been found on soybeans and peanuts grown in VirginiaTrace Elements Greg Mullins, Extension Nutrient Management Specialist, Virginia Tech Steve Heckendorn, Soil Test Laboratory Manager, Virginia Tech Soil Test Note #4 Introduction Your Soil Test Report

  3. ORIGINAL PAPER Wood ash effects on nutrient dynamics and soil properties

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    ORIGINAL PAPER Wood ash effects on nutrient dynamics and soil properties under Mediterranean aims to evaluate the effects of wood ash application on nutrient dynamics and soil properties of an acidic forest soil (Arenosol). & Methods Treatments were loose and pelleted ash application (11 Mg ha-1

  4. Sediment water exchange of trace metals and nutrients in Galveston Bay, Texas 

    E-Print Network [OSTI]

    Warnken, Kent Wayne

    1998-01-01

    -10% Of PO-3 4 10-17% of Si(OH)4, 5-31 % of Mn, 39-49% of Ni and 25-38% of Zn could be attributed to diffusion. To gain a further understanding of the distribution of trace metals between solid sediment and porewater, sequential sediment leaching experiments...

  5. Nutrient acquisition in dinoflagellates: the role of phosphorus and trace metals on community composition in coastal California and the northern Gulf of Alaska

    E-Print Network [OSTI]

    Peacock, Melissa Blakely

    2013-01-01

    as Nutrients by Eukaryotic Microalgae: A Multidisciplinaryas Nutrients by Eukaryotic Microalgae: A Multidisciplinaryas Nutrients by Eukaryotic Microalgae: A Multidisciplinary

  6. TRACE3D. Interactive Beam-Dynamics Program

    SciTech Connect (OSTI)

    Singleton, L.; Yao, C.Y.

    1993-12-01

    TRACE3D is an interactive program that calculates the envelopes of a bunched beam, including linear space-charge forces, through a user-defined system. The transport system may consist of the following elements: drift, thin lens, quadrupole, permanent magnet quadrupole, solenoid, doublet, triplet, bending magnet, edge angle (for bend), RF gap, radio-frequency-quadrupole cell, RF cavity, coupled-cavity tank, user-desired element, coordinate rotation, and identical element. The beam is represented by a 6X6 matrix defining a hyper-ellipsoid in six-dimensional phase space. The projection of this hyperellipsoid on any two-dimensional plane is an ellipse that defines the boundary of the beam in that plane.

  7. Energy and Nutrient Dynamics of Forest Floors in Three Minnesota Forests Author(s): W. A. Reiners and N. M. Reiners

    E-Print Network [OSTI]

    Thomas, David D.

    Energy and Nutrient Dynamics of Forest Floors in Three Minnesota Forests Author(s): W. A. Reiners. http://www.jstor.org #12;497 ENERGY AND NUTRIENT DYNAMICS OF FOREST FLOORS IN THREE MINNESOTA FORESTS and subsequent utilization by heterotrophs is a major pathway of energy flow. Forest floors can also

  8. Nutrient acquisition in dinoflagellates: the role of phosphorus and trace metals on community composition in coastal California and the northern Gulf of Alaska

    E-Print Network [OSTI]

    Peacock, Melissa Blakely

    2013-01-01

    stratification. Vertical migration depth corresponds to thebefore vertical migration to depth is triggered (Paasche etdinoflagellates’ migration for nutrients from depth offers a

  9. Characterization of protein redox dynamics induced during light-to-dark transitions and nutrient limitation in cyanobacteria

    SciTech Connect (OSTI)

    Ansong, Charles; Sadler, Natalie C.; Hill, Eric A.; Lewis, Michael P.; Zink, Erika M.; Smith, Richard D.; Beliaev, Alex S.; Konopka, Allan; Wright, Aaron T.

    2014-07-03

    Protein redox chemistry constitutes a major void in knowledge pertaining to photoautotrophic system regulation and signaling processes. We have employed a chemical biology approach to analyze redox sensitive proteins in live Synechococcus sp. PCC 7002 cells in both light and dark periods, and to understand how cellular redox balance is disrupted during nutrient perturbation. The present work identified several novel putative redox-sensitive proteins that are involved in the generation of reductant, macromolecule synthesis, and carbon flux through central metabolic pathways, and may be involved in cell signaling and response mechanisms. Furthermore, our research suggests that dynamic redox changes in response to specific nutrient limitations contribute to the regulatory changes driven by a shift from light to dark. Taken together, these results contribute to the high-level understanding of post-translational mechanisms regulating flux distributions and therefore present potential metabolic engineering targets for redirecting carbon towards biofuel precursors.

  10. Nutrient dynamics in marsh sediments contaminated by an oil spill following a flood 

    E-Print Network [OSTI]

    Harris, Benjamin Cord

    1997-01-01

    This research involves a study of the natural recovery of a brackish marsh impacted by an oil spill and fire in which the area was naturally enhanced with elevated nutrient levels. Flood waters during October, 1994, ruptured a group of pipelines...

  11. JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 95, NO. B7, PAGES 11,301-11,315, JULY 10, 1990 Vertical Seismic Profile Synthetics by Dynamic Ray Tracing

    E-Print Network [OSTI]

    Cerveny, Vlastislav

    Seismic Profile Synthetics by Dynamic Ray Tracing in Laterally Varying Layered Anisotropic StructuresJOURNAL OF GEOPHYSICAL RESEARCH, VOL. 95, NO. B7, PAGES 11,301-11,315, JULY 10, 1990 VerticalSciences,Prague, Czechdovakia Dynamic ray tracing (DRT) is important in evaluating high-frequency seismic

  12. EDDY RESOLVING NUTRIENT ECODYNAMICS IN THE GLOBAL PARALLEL OCEAN PROGRAM AND CONNECTIONS WITH TRACE GASES IN THE SULFUR, HALOGEN AND NMHC CYCLES

    SciTech Connect (OSTI)

    S. CHU; S. ELLIOTT

    2000-08-01

    Ecodynamics and the sea-air transfer of climate relevant trace gases are intimately coupled in the oceanic mixed layer. Ventilation of species such as dimethyl sulfide and methyl bromide constitutes a key linkage within the earth system. We are creating a research tool for the study of marine trace gas distributions by implementing coupled ecology-gas chemistry in the high resolution Parallel Ocean Program (POP). The fundamental circulation model is eddy resolving, with cell sizes averaging 0.15 degree (lat/long). Here we describe ecochemistry integration. Density dependent mortality and iron geochemistry have enhanced agreement with chlorophyll measurements. Indications are that dimethyl sulfide production rates must be adjusted for latitude dependence to match recent compilations. This may reflect the need for phytoplankton to conserve nitrogen by favoring sulfurous osmolytes. Global simulations are also available for carbonyl sulfide, the methyl halides and for nonmethane hydrocarbons. We discuss future applications including interaction with atmospheric chemistry models, high resolution biogeochemical snapshots and the study of open ocean fertilization.

  13. Dynamics of the solar chromosphere. V. High-frequency modulation in ultraviolet image sequences from TRACE

    E-Print Network [OSTI]

    A. G. de Wijn; R. J. Rutten; T. D. Tarbell

    2007-06-13

    We search for signatures of high-frequency oscillations in the upper solar photosphere and low chromosphere in the context of acoustic heating of outer stellar atmospheres. We use ultraviolet image sequences of a quiet center-disk area from the Transition Region and Coronal Explorer (TRACE) mission which were taken with strict cadence regularity. The latter permits more reliable high-frequency diagnosis than in earlier work. Spatial Fourier power maps, spatially averaged coherence and phase-difference spectra, and spatio-temporal k-f decompositions all contain high-frequency features that at first sight seem of considerable intrinsic interest but actually are more likely to represent artifacts of different nature. Spatially averaged phase difference measurement provides the most sensitive diagnostic and indicates the presence of acoustic modulation up to f=20 mHz (periods down to 50 seconds) in internetwork areas.

  14. Microbial Metabolism Microbial nutrients,

    E-Print Network [OSTI]

    Huang, Ching-Tsan

    1 Microbial Metabolism Microbial nutrients, growth and cultivation Ching-Tsan Huang () Office: Agronomy Hall, Room 111 Tel: (02) 33664454 E-mail: cthuang@ntu.edu.tw #12;2 Microbial Nutrition Purpose To obtain energy and construct new cellular components Nutrient Requirement The major elements: C, O, H, N

  15. Spatial variations in soil and plant delta 13 C and delta 15 N values in a subtropical savanna: implications for vegetation change and nutrient dynamics 

    E-Print Network [OSTI]

    Bai, E

    2009-05-15

    lower-lying portions of the landscape are dominated by closed-canopy woodlands. I used soil ?13C in conjunction with aerial photography and geostatistics to quantify landscape-scale vegetation dynamics in uplands of this savanna parkland. Spatial...

  16. Event-driven multithreaded dynamic optimization

    E-Print Network [OSTI]

    Zhang, Weifeng

    2006-01-01

    Speci?c Optimizations . . . . . . . . . . . . . F.3. Trace Optimization Overhead . . . . . . . . . . . . . . .Dynamic Optimization . . . . . . .B. Optimizations with the

  17. Photon Maps Photon Tracing

    E-Print Network [OSTI]

    Lischinski, Dani

    Photon Maps Photon Tracing Simulating light propagation by shooting photons from the light sources. Photon Tracing Storing the incidences of photon's path. Implementing surface properties statistically. Russian Roulette. Photon Tracing Photon maps keep: Incidence point (in 3D). The normal at that point

  18. Scalable Communication Trace Compression

    SciTech Connect (OSTI)

    Krishnamoorthy, Sriram; Agarwal, Khushbu

    2010-05-17

    Characterizing the communication behavior of parallel programs through tracing can help understand an application’s characteristics, model its performance, and predict behavior on future systems. However, lossless communication traces can get prohibitively large, causing programmers to resort to variety of other techniques. In this paper, we present a novel approach to lossless communication trace compression. We augment the sequitur compression algorithm to employ it in communication trace compression of parallel programs. We present optimizations to reduce the memory overhead, reduce size of the trace files generated, and enable compression across multiple processes in a parallel program. The evaluation shows improved compression and reduced overhead over other approaches, with up to 3 orders of magnitude improvement for the NAS MG benchmark. We also observe that, unlike existing schemes, the trace files sizes and the memory overhead incurred are less sensitive to, if not independent of, the problem size for the NAS benchmarks.

  19. COURSE SYLLABUS ENVIRONMENTAL NUTRIENT MANAGEMENT

    E-Print Network [OSTI]

    Ma, Lena

    1 COURSE SYLLABUS ENVIRONMENTAL NUTRIENT MANAGEMENT SWS 4116 / 5115 3 Credits 2102 McCarty Hall. UNIVERSITY POLICIES A. STUDENTS REQUIRING SPECIAL ASSISTANCE: Students requesting classroom accommodations

  20. Effects of afforestation and forest management on soil carbon dynamics and trace gas emissions in a Sitka spruce (Picea sitchensis (Bong) Carr.) forest 

    E-Print Network [OSTI]

    Zerva, Argyro

    The establishment and intensive management of forests for the production of timber can have significant effects on the soil carbon dynamics. The establishment of forest on organic soils under grasslands may lead to ...

  1. Nutrient Management Module No. 14 Technological

    E-Print Network [OSTI]

    Lawrence, Rick L.

    Nutrient Management Module No. 14 Technological Advances in Nutrient Management by Susan Mc CCA 1 NM CEU #12;Module 14 · Technological Advances in Nutrient Management2 Background Innovations of nutrient management tools. Driving these technological advances is the growing awareness of soil nutrient

  2. Nutrient Management TrainingNutrient Management Training for Technical Service Providersfor Technical Service Providers

    E-Print Network [OSTI]

    Nutrient Management TrainingNutrient Management Training for Technical Service Providersfor Management Planning Technical Guidance.Management Planning Technical Guidance. Manure and Wastewater Handling Nutrient ManagementNutrient Management ­­ Record KeepingRecord Keeping ­­ Feed ManagementFeed Management

  3. Analyzing PICL trace data with MEDEA

    SciTech Connect (OSTI)

    Merlo, A.P.; Worley, P.H.

    1993-11-01

    Execution traces and performance statistics can be collected for parallel applications on a variety of multiprocessor platforms by using the Portable Instrumented Communication Library (PICL). The static and dynamic performance characteristics of performance data can be analyzed easily and effectively with the facilities provided within the MEasurements Description Evaluation and Analysis tool (MEDEA). This report describes the integration of the PICL trace file format into MEDEA. A case study is then outlined that uses PICL and MEDEA to characterize the performance of a parallel benchmark code executed on different hardware platforms and using different parallel algorithms and communication protocols.

  4. Tracing Geothermal Fluids

    SciTech Connect (OSTI)

    Michael C. Adams Greg Nash

    2004-03-31

    Chemical compounds have been designed under this contract that can be used to trace water that has been injected into vapor-dominated and two-phase geothermal fields. Increased knowledge of the injection flow is provided by the tracers, and this augments the power that can be produced. Details on the stability and use of these tracers are included in this report.

  5. Plant Available Nutrients, Barrow, Alaska, Ver. 1

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

    Sloan, Victoria; Liebig, Jenny; Curtis, Bryan; Hahn, Melanie; Iversen, Colleen; Siegrist, Julie

    This dataset consists of measurements of plant available nutrients made using Plant Root Simulator probes (Western Ag Innovations Inc.) during 2012 and 2013. In 2012, Ca, Mg, K, P, Fe, Mn, Cu, Zn, B, S, Pb, Al, Cd, NO3-N and NH4-N were measured during spring, summer and winter in the centers, edges and troughs of four polygons in each of four areas of contrasting moisture regime and polygon type. In 2013, probes were installed in centers, edges and troughs of four polygons in each of two areas (high-centered and low-centered polygons) at two-week intervals and at 3 soil depths to capture fine-scale season dynamics of NO3-N and NH4-N. PRS probes are ion exchange resin membranes held in plastic supports that are inserted into soil to measure ion supply in situ. The anion and cation exchange with the membrane is intended to mimic plant uptake and thus provide a relevant measure of soil nutrient bioavailability. Measurements are made per area of probe membrane and cannot be converted to concentrations or related to soil volume.

  6. Plant Available Nutrients, Barrow, Alaska, Ver. 1

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

    Sloan, Victoria; Liebig, Jenny; Curtis, Bryan; Hahn, Melanie; Iversen, Colleen; Siegrist, Julie

    2014-02-19

    This dataset consists of measurements of plant available nutrients made using Plant Root Simulator probes (Western Ag Innovations Inc.) during 2012 and 2013. In 2012, Ca, Mg, K, P, Fe, Mn, Cu, Zn, B, S, Pb, Al, Cd, NO3-N and NH4-N were measured during spring, summer and winter in the centers, edges and troughs of four polygons in each of four areas of contrasting moisture regime and polygon type. In 2013, probes were installed in centers, edges and troughs of four polygons in each of two areas (high-centered and low-centered polygons) at two-week intervals and at 3 soil depths to capture fine-scale season dynamics of NO3-N and NH4-N. PRS probes are ion exchange resin membranes held in plastic supports that are inserted into soil to measure ion supply in situ. The anion and cation exchange with the membrane is intended to mimic plant uptake and thus provide a relevant measure of soil nutrient bioavailability. Measurements are made per area of probe membrane and cannot be converted to concentrations or related to soil volume.

  7. Regulating nutrient allocation in plants

    DOE Patents [OSTI]

    Udvardi, Michael; Yang, Jiading; Worley, Eric

    2014-12-09

    The invention provides coding and promoter sequences for a VS-1 and AP-2 gene, which affects the developmental process of senescence in plants. Vectors, transgenic plants, seeds, and host cells comprising heterologous VS-1 and AP-2 genes are also provided. Additionally provided are methods of altering nutrient allocation and composition in a plant using the VS-1 and AP-2 genes.

  8. Multiple soil nutrient competition between plants, microbes,...

    Office of Scientific and Technical Information (OSTI)

    Journal Article: Multiple soil nutrient competition between plants, microbes, and mineral surfaces: model development, parameterization, and example applications in several...

  9. South CarolinaSouth Carolina Nutrient Management Rules,Nutrient Management Rules,

    E-Print Network [OSTI]

    's Animal Waste Management engineering software (v 2.1 or higher) AFOProAFOProTMTM #12;SC ManureSC ManureSouth CarolinaSouth Carolina Nutrient Management Rules,Nutrient Management Rules, Regulations, andManure Production Poultry ­ 40% Cow ­ 48% Swine ­ 12% #12;Nutrient Management ofNutrient Management of Confined

  10. Nutrient Management in TexasNutrient Management in Texas Sam FeagleySam Feagley

    E-Print Network [OSTI]

    Nutrient Management in TexasNutrient Management in Texas Sam FeagleySam Feagley Texas Cooperative ExtensionTexas Cooperative Extension #12;ObjectivesObjectives ·· 1. Describe the Nutrient Management Practice1. Describe the Nutrient Management Practice Standard process in TexasStandard process in Texas

  11. Automated nutrient analyses in seawater

    SciTech Connect (OSTI)

    Whitledge, T.E.; Malloy, S.C.; Patton, C.J.; Wirick, C.D.

    1981-02-01

    This manual was assembled for use as a guide for analyzing the nutrient content of seawater samples collected in the marine coastal zone of the Northeast United States and the Bering Sea. Some modifications (changes in dilution or sample pump tube sizes) may be necessary to achieve optimum measurements in very pronounced oligotrophic, eutrophic or brackish areas. Information is presented under the following section headings: theory and mechanics of automated analysis; continuous flow system description; operation of autoanalyzer system; cookbook of current nutrient methods; automated analyzer and data analysis software; computer interfacing and hardware modifications; and trouble shooting. The three appendixes are entitled: references and additional reading; manifold components and chemicals; and software listings. (JGB)

  12. Nutrient Shielding in Clusters of Cells

    E-Print Network [OSTI]

    Maxim O. Lavrentovich; John H. Koschwanez; David R. Nelson

    2013-06-13

    Cellular nutrient consumption is influenced by both the nutrient uptake kinetics of an individual cell and the cells' spatial arrangement. Large cell clusters or colonies have inhibited growth at the cluster's center due to the shielding of nutrients by the cells closer to the surface. We develop an effective medium theory that predicts a thickness $\\ell$ of the outer shell of cells in the cluster that receives enough nutrient to grow. The cells are treated as partially absorbing identical spherical nutrient sinks, and we identify a dimensionless parameter $\

  13. Analyzing PICL trace data with MEDEA

    SciTech Connect (OSTI)

    Merlo, A.P.; Worley, P.H.

    1994-04-01

    Execution traces and performance statistics can be collected for parallel applications on a variety of multiprocessor platforms by using the Portable Instrumented Communication Library (PICL). The static and dynamic performance characteristics of performance characteristics of performance data can be analyzed easily and effectively with the facilities provided within the MEasurements Description Evaluation and Analysis tool (MEDEA). A case study is then outlined that uses PICL and MEDEA to characterize the performance of a parallel benchmark code executed on different hardware platforms and using different parallel algorithms and communication protocols.

  14. Major Nutrient Recycling for Sustained Algal Production

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

    Project Peer Review Major Nutrient Recycling for Sustained Algal Production 3252015 Algae Technology Area Review Todd W. Lane Sandia National Laboratories This presentation...

  15. Nutrient Limitation in Northern Gulf of Mexico (NGOM): Phytoplankton Communities and Photosynthesis Respond to Nutrient Pulse 

    E-Print Network [OSTI]

    Zhao, Yan; Quigg, Antonietta

    2014-02-14

    Although the Mississippi-Atchafalaya River system exports large amounts of nutrients to the Northern Gulf of Mexico annually, nutrient limitation of primary productivity still occurs offshore, acting as one of the major ...

  16. REquirements TRacing On target (RETRO) Enhanced with an Automated Thesaurus Builder

    E-Print Network [OSTI]

    Hayes, Jane E.

    REquirements TRacing On target (RETRO) Enhanced with an Automated Thesaurus Builder: An Empirical of the tracing process, including use of a thesaurus. Some thesauri pre-exist and have been shown to improve that accepts textual artifacts as input and generates a thesaurus dynamically, we call it Thesaurus Builder. We

  17. Nutrient Needs at a Glance 

    E-Print Network [OSTI]

    Bielamowicz, Mary K.

    2003-02-10

    N :CD ,notgnihsa ,sserP ymedacA .2002-7991 yrateiD dednemmoceR W .de ht01 ,secnawollA lanoitaN :CD notgnihsa .9891 ,sserP ymedacA P ,lesnI renruT ,. ,noitirtuN gnirevocsiD .D ,ssoR .E .R , ehT citeteiD naciremA .noitaicossA .2002 ,srehsilbuP tteltra...B dna senoJ :notsoB ,tsilaicepS noitirtuN noisnetxE dna rosseforP ,zciwomaleiB yenniK yraM yb desiveR ehT saxeT .metsyS ytisrevinU M&A 5781-L 30-1 Estimated safe and adequate daily dietary intakes of selected vitamins and minerals Nutrient and other...

  18. Epidemic Contact Tracing via Communication Traces Katayoun Farrahi1

    E-Print Network [OSTI]

    interactions, where contagious outbreaks propagate. However, due to privacy constraints and noisy data traces may be a viable option to arrest contagious outbreaks. Citation: Farrahi K, Emonet R, Cebrian M

  19. San Francisco Bay Nutrient Management Strategy

    E-Print Network [OSTI]

    NUMBER 733 DEC 2014 San Francisco Bay Nutrient Management Strategy: Detailed Modeling Workplan-746-7334 (SFEI) · f: 510-746-7300 · www.sfei.org #12;THIS REPORT SHOULD BE CITED AS: SFEI (2014). San Francisco Bay Nutrient Management Strategy: Detailed Modeling Workplan for FY15-FY21. San Francisco Estuary

  20. Tracing Paleoclimate over the Past 25,000 Years Using Evidence from Radiogenic Isotopes 

    E-Print Network [OSTI]

    Xie, Ruifang

    2013-04-30

    investigated the dynamics of the Intertropical Convergence Zone (ITCZ) over the past 25 kyr in the eastern equatorial Pacific by fingerprinting dust provenance using radiogenic isotopes (Nd, Sr, Pb) and trace elements (Fe, Si, Ba) in the detrital fraction...

  1. Original article Biomass, litterfall and nutrient content in

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Original article Biomass, litterfall and nutrient content in Castanea sativa coppice stands November 1995) Summary - Aboveground biomass and nutrient content, litterfall and nutrient return) and Catania (Italy). Best regression equations for the aboveground biomass were obtained by applying the allo

  2. Treatment of Trace Organic Contaminants and Nutrients in Open-Water Unit Process Wetlands

    E-Print Network [OSTI]

    Jasper, Justin Thomas

    2014-01-01

    a shallow cell lined with geotextile fabric to prevent theshallow basins lined with a geotextile fabric to prevent thethese cells, concrete or geotextile liners are used on the

  3. Algae-to-Fuel: Integrating Thermochemical Conversion, Nutrient...

    Office of Environmental Management (EM)

    Algae-to-Fuel: Integrating Thermochemical Conversion, Nutrient Recycling, and Wastewater Algae-to-Fuel: Integrating Thermochemical Conversion, Nutrient Recycling, and Wastewater...

  4. Sandia Algae Researchers Cut Costs with Improved Nutrient Recycling...

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

    Sandia Algae Researchers Cut Costs with Improved Nutrient Recycling Sandia Algae Researchers Cut Costs with Improved Nutrient Recycling October 19, 2015 - 3:40pm Addthis Ryan Davis...

  5. Sandia Algae Researchers Cut Costs with Improved Nutrient Recycling...

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

    Sandia Algae Researchers Cut Costs with Improved Nutrient Recycling Sandia Algae Researchers Cut Costs with Improved Nutrient Recycling October 5, 2015 - 12:16pm Addthis Ryan Davis...

  6. Nutrient Requirements of the Cow and Calf. 

    E-Print Network [OSTI]

    Maddox, L. A. Jr.

    1965-01-01

    of the Cow and Calf TEXAS A&M UNIVERSITY TEXAS AGRICULTURAL EXTENSION SERVICE, J. E. Hutchison, Director College Station, Texas I contents I-. Energy Requirements, 3 Protein Requirements, 8 Daily Nutrient Requirements and Minimum Feed Quality, 9... and energy value of feeds antl nutrient requirements of If'. Information necessary to establish require- animals (Glossary of Energy Terms, 1962) . A :nts for several functions are limited and some- megacalorie is the same as a tllerm and is the pre- nes...

  7. Trace Estimates for Stable Processes

    E-Print Network [OSTI]

    2007-05-01

    May 1, 2007 ... In this paper we study the behaviour in time of the trace (the partition function) ... cess with independent and stationary increments and characteristic function. E0ei?Xt = e?t|?|? ... theory of heat semigroups as described in [14]. In fact, it follows ..... For bounded. C1,1 domains it is known that Ex(?D) ? c(D, ?)?.

  8. Nutrient ManagementNutrient Management Program in OklahomaProgram in Oklahoma

    E-Print Network [OSTI]

    Nutrient ManagementNutrient Management Program in OklahomaProgram in Oklahoma Hailin Zhang and Dan Storm Oklahoma State University Harold Springer, ODAFF Larry Poindexter, OK NRCS #12;The Diversified OklahomaThe Diversified Oklahoma Usually acidic Usually not acidic #12;#12;Major Commodities in Oklahoma

  9. Minnesota's Computer Industry: History, Legacies, Traces

    E-Print Network [OSTI]

    Sobelman, Gerald E.

    : payroll, taxes, suburban development History | Legacies | Traces #12;Control Data at Minnesota state fair | Legacies | Traces A. Univac West 7th (1956) 2750 Shepard Road, Saint Paul B. ERA plant #1 (1946) Midway

  10. Distributed trace using central performance counter memory

    DOE Patents [OSTI]

    Satterfield, David L; Sexton, James C

    2013-10-22

    A plurality of processing cores, are central storage unit having at least memory connected in a daisy chain manner, forming a daisy chain ring layout on an integrated chip. At least one of the plurality of processing cores places trace data on the daisy chain connection for transmitting the trace data to the central storage unit, and the central storage unit detects the trace data and stores the trace data in the memory co-located in with the central storage unit.

  11. Distributed trace using central performance counter memory

    DOE Patents [OSTI]

    Satterfield, David L.; Sexton, James C.

    2013-01-22

    A plurality of processing cores, are central storage unit having at least memory connected in a daisy chain manner, forming a daisy chain ring layout on an integrated chip. At least one of the plurality of processing cores places trace data on the daisy chain connection for transmitting the trace data to the central storage unit, and the central storage unit detects the trace data and stores the trace data in the memory co-located in with the central storage unit.

  12. Tracing the magmatic/hydrothermal transition in regional low-strain zones: The role of magma dynamics in strain localization at pluton roof, implications for intrusion-related gold

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    dynamics in strain localization at pluton roof, implications for intrusion-related gold deposits Eric features of a granite-pluton roof; large-scale dykes and a network of gold veins are intensively developed in this roof, recording a succession of mechanical instabilities. Our gravity survey underlines the presence

  13. Casimir Effect and Trace formula Andreas Wirzba

    E-Print Network [OSTI]

    Wirzba, Andreas - Helmholtz-Institut für Strahlen- und Kernphysik (HISKP)

    1 Casimir Effect and Trace formula Andreas Wirzba Institut f¨ur Kernphysik Forschungszentrum J¨ulich · · Andreas Wirzba Casimir effect and trace formula Copenhagen, 17 May 2006 #12;1 Casimir Effect and Trace formula Andreas Wirzba Institut f¨ur Kernphysik Forschungszentrum J¨ulich 1. Introduction to the Casimir

  14. Trace Explosive Detection Using Nanosensors

    SciTech Connect (OSTI)

    Senesac, Larry R [ORNL; Thundat, Thomas George [ORNL

    2008-01-01

    Selective and sensitive detection of explosives is very important in countering terrorist threats. Detecting trace explosives has become a very complex and expensive endeavor because of a number of factors, such as the wide variety of materials that can be used as explosives, the lack of easily detectable signatures, the vast number of avenues by which these weapons can be deployed, and the lack of inexpensive sensors with high sensitivity and selectivity. High sensitivity and selectivity, combined with the ability to lower the deployment cost of sensors using mass production, is essential in winning the war on explosives-based terrorism. Nanosensors have the potential to satisfy all the requirements for an effective platform for the trace detection of explosives.

  15. Carbon stable isotopes suggest that hippopotamus-vectored nutrients subsidize

    E-Print Network [OSTI]

    Lewison, Rebecca

    Carbon stable isotopes suggest that hippopotamus-vectored nutrients subsidize aquatic consumers that hippopotamus-vectored nutrients subsidize aquatic consumers in an East African river. Ecosphere 6(4):52. http

  16. Original article Biomass and nutrient cycling of a highly productive

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Original article Biomass and nutrient cycling of a highly productive Corsican pine stand on former 14 April; accepted 22 September 1997) Abstract - Biomass and nutrient cycling were examined in a 62 on a coarse and dry sandy soil with low exchangeable nutrient pools. Total aboveground biomass was estimated

  17. SEDIMENT AND NUTRIENT ACCUMULATION WITHIN LOWLAND BOTTOMLAND ECOSYSTEMS

    E-Print Network [OSTI]

    SEDIMENT AND NUTRIENT ACCUMULATION WITHIN LOWLAND BOTTOMLAND ECOSYSTEMS: AN EXAMPLE FROM THE ATCHAFALAYA RIVER BASIN, LOUISIANA C.R. Hupp1 and G.B. Noe1 ABSTRACT Sediment and nutrient deposition, storage and interpretation of sedimentation/nutrient processes remain incomplete. Our studies located in the Coastal Plain

  18. Nutrients and biomass allocation 1 Microcosm analysis of the impact of nutrients and allochthonous carbon on microbial production

    E-Print Network [OSTI]

    Vallino, Joseph J.

    Nutrients and biomass allocation 1 Microcosm analysis of the impact of nutrients and allochthonous MBL St., Woods Hole, MA 02543 19 December 2005 #12;Nutrients and biomass allocation 2 Abstract on the goal function of Maximum Entropy Production (MEP), I have hypothesized that living systems

  19. Traces on Module Categories over Fusion Categories

    E-Print Network [OSTI]

    Gregor Schaumann

    2015-01-27

    We consider traces on module categories over pivotal fusion categories which are compatible with the module structure. It is shown that such module traces characterise the Morita classes of special haploid symmetric Frobenius algebras. Moreover, they are unique up to a scale factor and they equip the dual category with a pivotal structure. This implies that for each pivotal structure on a fusion category over the complex numbers there exists a conjugate pivotal structure defined by the canonical module trace.

  20. Acceleration of the Retinal Vascular Tracing Algorithm

    E-Print Network [OSTI]

    Kepner, Jeremy

    Acceleration of the Retinal Vascular Tracing Algorithm using FPGAs Direction Filter Design FPGA along with image processing results at frame rate with low latency Results MEMORY 2 Results MEMORY 3 Memory Switching Design #12;Retinal Vascular Tracing Application Goal: Detection and enhancement

  1. The Natural Aerodynamic Sampling of Trace Explosives from the Human Body

    E-Print Network [OSTI]

    Settles, Gary S.

    The Natural Aerodynamic Sampling of Trace Explosives from the Human Body Gary S. Settles, Huban A. Gowadia, Sean B. Strine, and Timothy E. Johnson Gas Dynamics Lab, Mechanical Engineering Dept., 301D Reber developed for this purpose, their widespread use may be too slow for airport security use and may

  2. Tracing bottom water oxygenation with sedimentary Mn/Fe ratios in Lake Zurich, Switzerland

    E-Print Network [OSTI]

    Gilli, Adrian

    Tracing bottom water oxygenation with sedimentary Mn/Fe ratios in Lake Zurich, Switzerland and Management, Seestrasse 79, CH-6047 Kastanienbaum, Switzerland b ETH Zurich, Institute for Biogeochemistry and Pollution Dynamics, Universitaetstrasse 16, CH-8092 Zurich, Switzerland c ETH Zurich, Geological Institute

  3. Nutrient ManagementNutrient Management Program in OklahomaProgram in Oklahoma

    E-Print Network [OSTI]

    Beef Cattle Swine Poultry #12;Crop Land Livestock Manure Recycling nutrients #12;Soil Test PEducation Certified over 200 manure management planners Over 350 swine waste operators, 9-hr initial, 3-hr annual OverMajor Commodities in Oklahoma 2.4 58 5.4 Total # (Million) 29 8 3 11 11 4 National Rank 1756Milk Production 3335Hogs

  4. Easy system call tracing for Plan 9.

    SciTech Connect (OSTI)

    Minnich, Ronald G.

    2010-09-01

    Tracing system calls makes debugging easy and fast. On Plan 9, traditionally, system call tracing has been implemented with acid. New systems do not always implement all the capabilities needed for Acid, particularly the ability to rewrite the process code space to insert breakpoints. Architecture support libraries are not always available for Acid, or may not work even on a supported architecture. The requirement that Acid's libraries be available can be a problem on systems with a very small memory footprint, such as High Performance Computing systems where every Kbyte counts. Finally, Acid tracing is inconvenient in the presence of forks, which means tracing shell pipelines is particularly troublesome. The strace program available on most Unix systems is far more convenient to use and more capable than Acid for system call tracing. A similar system on Plan 9 can simplify troubleshooting. We have built a system calling tracing capability into the Plan 9 kernel. It has proven to be more convenient than strace in programming effort. One can write a shell script to implement tracing, and the C code to implement an strace equivalent is several orders of magnitude smaller.

  5. EIT and TRACE responses to flare plasma

    E-Print Network [OSTI]

    D. Tripathi; G. Del Zanna; H. E. Mason; C. Chifor

    2008-02-26

    Aims: To understand the contribution of active region and flare plasmas to the $\\lambda$195 channels of SOHO/EIT (Extreme-ultraviolet Imaging Telescope) and TRACE (Transition Region and Coronal Explorer). Methods: We have analysed an M8 flare simultaneously observed by the Coronal Diagnostic Spectrometer (CDS), EIT, TRACE and RHESSI. We obtained synthetic spectra for the flaring region and an outer region using the differential emission measures (DEM) of emitting plasma based on CDS and RHESSI observations and the CHIANTI atomic database. We then predicted the EIT and TRACE count rates. Results: For the flaring region, both EIT and TRACE images taken through the $\\lambda$195 filter are dominated by Fe ${\\rm XXIV}$ (formed at about 20 MK). However, in the outer region, the emission was primarily due to the Fe${\\rm XII}$, with substantial contributions from other lines. The average count rate for the outer region was within 25% the observed value for EIT, while for TRACE it was a factor of two higher. For the flare region, the predicted count rate was a factor of two (in case of EIT) and a factor of three (in case of TRACE) higher than the actual count rate. Conclusions: During a solar flare, both TRACE and EIT $\\lambda$195 channels are found to be dominated by Fe ${\\rm XXIV}$ emission. Reasonable agreement between predictions and observations is found, however some discrepancies need to be further investigated.

  6. Grazers, producer stoichiometry, and the light?: nutrient hypothesis revisited.

    E-Print Network [OSTI]

    Hall, Spencer R.; Leibold, Mathew A.; Lytle, David A.; Smith, Val H.

    2007-01-01

    ; nitrogen : phosphorus supply; ponds. INTRODUCTION Primary productivity in aquatic ecosystems depends critically both upon light availability and upon the supplies of nutrients such as nitrogen and phosphorus (Smith 1979). These key resources govern... govern fundamental processes in ecosystems, such as the transfer and allocation of energy and nutrients among trophic levels (Andersen 1997, Sterner et al. 1997, 1998, Sterner and Elser 2002). Most discussions of the light : nutrient hypothesis to date...

  7. Recycling of Nutrients and Water in Algal Biofuels Production

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

    not substantially improve nutrient solubilization after anaerobic and aerobic digestions. Biogas production increased by 15%, but that is insufficient to cover the energy input of...

  8. Trace Element Analysis At Nw Basin & Range Region (Coolbaugh...

    Open Energy Info (EERE)

    Trace Element Analysis At Nw Basin & Range Region (Coolbaugh, Et Al., 2010) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Trace Element...

  9. Trace Element Analysis At Central Nevada Seismic Zone Region...

    Open Energy Info (EERE)

    Trace Element Analysis At Central Nevada Seismic Zone Region (Coolbaugh, Et Al., 2010) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Trace...

  10. Nitrate and nutrient accumulation in two varieties of bermudagrass (Cynodon dactylon (L.) Pers.) as influenced by soil applied fertilizer nutrients 

    E-Print Network [OSTI]

    Lovelace, Dale Allen

    1968-01-01

    NITRATE AND NUTRIENT ACCUMULATION IN TWO VARIETIES OF BDRKIDllddlidd (C~d ~dt L (L. ) F . ) AS INFLUENCED BY SOIL APPLIED FERTILIZER NUTRIENTS A Thesis By DALE A. LOVELACE Submitted to the Graduate College of the TEXAS A6H UNIVERSITY... in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE January 1968 Major Subject: Agronomy NITRATE AND NUTRIENT ACCUMULATION IN TWO VARIETIES DP EEEEDDECEEEE EC~d ~dt L EL. ) P . ) AS INFLUENCED BY SOIL APPLIED FERTILIZER NUTRl...

  11. Extraction of trace metals from fly ash

    DOE Patents [OSTI]

    Blander, Milton (Palos Park, IL); Wai, Chien M. (Moscow, ID); Nagy, Zoltan (Woodridge, IL)

    1984-01-01

    A process for recovering silver, gallium and/or other trace metals from a fine grained industrial fly ash associated with a process for producing phosphorous, the fly ash having a silicate base and containing surface deposits of the trace metals as oxides, chlorides or the like, with the process being carried out by contacting the fly ash with AlCl.sub.3 in an alkali halide melt to react the trace metals with the AlCl.sub.3 to form compositions soluble in the melt and a residue containing the silicate and aluminum oxide or other aluminum precipitate, and separating the desired trace metal or metals from the melt by electrolysis or other separation techniques.

  12. Extraction of trace metals from fly ash

    DOE Patents [OSTI]

    Blander, M.; Wai, C.M.; Nagy, Z.

    1983-08-15

    A process is described for recovering silver, gallium and/or other trace metals from a fine grained industrial fly ash associated with a process for producing phosphorous. The fly ash has a silicate base and contains surface deposits of the trace metals as oxides, chlorides or the like. The process is carried out by contacting the fly ash with AlCl/sub 3/ in an alkali halide melt to react the trace metals with the AlCl/sub 3/ to form compositions soluble in the melt and a residue containing the silicate and aluminum oxide or other aluminum precipitate, and separating the desired trace metal or metals from the melt by electrolysis or other separation techniques.

  13. Traces on finite W-algebras

    E-Print Network [OSTI]

    Etingof, Pavel I.

    We compute the space of Poisson traces on a classical W-algebra, i.e., linear functionals invariant under Hamiltonian derivations. Modulo any central character, this space identifies with the top cohomology of the corresponding ...

  14. CP-violating CFT and trace anomaly

    E-Print Network [OSTI]

    Yu Nakayama

    2012-01-26

    It is logically possible that the trace anomaly in four dimension includes the Hirzebruch-Pontryagin density in CP violating theories. Although the term vanishes at free conformal fixed points, we realize such a possibility in the holographic renormalization group and show that it is indeed possible. The Hirzebruch-Pontryagin term in the trace anomaly may serve as a barometer to understand how much CP is violated in conformal field theories.

  15. Diatom-bound 15 N: New support for enhanced nutrient

    E-Print Network [OSTI]

    Sigman, Daniel M.

    associated with sea ice melting. Enhanced nutrient consumption in the glacial subantarctic would have worked 2005. [1] Diatom-bound 15 N/14 N was used to reconstruct the glacial nutrient status of 5 to 6% during the Last Glacial Maximum and a decrease, coincident with the glacial termination

  16. Retention of Riverine Sediment and Nutrient Loads by Coastal Plain

    E-Print Network [OSTI]

    Retention of Riverine Sediment and Nutrient Loads by Coastal Plain Floodplains Gregory B. Noe for their cumulative retention of the annual river loads of nutrients or sediments. Here we report measurements of sediment accretion and associated carbon, nitrogen, and phosphorus accu- mulation as sedimentation over

  17. Nutrient export from freshwater ecosystems by anadromous sockeye salmon (Oncorhynchus

    E-Print Network [OSTI]

    Nutrient export from freshwater ecosystems by anadromous sockeye salmon (Oncorhynchus nerka that sockeye salmon (Oncorhynchus nerka) imported and exported from four major systems in Bristol Bay, Alaska into fresh waters. The percentage of parental nutrients that smolts exported varied through time and among

  18. Original article Changes in foliar nutrient content and resorption

    E-Print Network [OSTI]

    Boyer, Edmond

    Original article Changes in foliar nutrient content and resorption in Fraxinus excelsior L., Ulmus in the flooded forest, causes high fluctuations of water level and increases bioavailability of cer- tain the variability of the test species response (nutrient con- tent and resorption) to the soil and flood water

  19. Semi-classical formula beyond the Ehrenfest time in quantum chaos. (I) Trace formula

    E-Print Network [OSTI]

    Frederic Faure

    2007-03-19

    We consider a nonlinear area preserving Anosov map M on the torus phase space, which is the simplest example of a fully chaotic dynamics. We are interested in the quantum dynamics for long time, generated by the unitary quantum propagator Mq. The usual semi-classical Trace formula expresses Tr(Mq^t) for finite time t, in the limit hbar->0, in terms of periodic orbits of M of period t. Recent work reach time t<< tE/6 where tE=log(1/hbar)/lambda is the Ehrenfest time, and lambda is the Lyapounov coefficient. Using a semi-classical normal form description of the dynamics uniformly over phase space, we show how to extend the trace formula for longer time of the form t= C.tE where C is any constant, with an arbitrary small error.

  20. The trace formula The Langevin process in R

    E-Print Network [OSTI]

    Herrmann, Samuel

    The trace formula The Langevin process in R Symmetric spaces and the Malliavin calculus and the trace formula Jean-Michel Bismut Universit´e Paris-Sud, Orsay `A la m´emoire de Paul Malliavin Jean-Michel Bismut The Malliavin calculus and the trace formula #12;The trace formula The Langevin process in R

  1. Foundations of the Trace Assertion Method of Module Interface Specification

    E-Print Network [OSTI]

    Sekerinski, Emil

    states and the behaviors observed are fully described by traces built from access program invocations

  2. Multiple soil nutrient competition between plants, microbes, and mineral surfaces: model development, parameterization, and example applications in several tropical forests

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

    Zhu, Q.; Riley, W. J.; Tang, J.; Koven, C. D.

    2015-03-05

    Soil is a complex system where biotic (e.g., plant roots, micro-organisms) and abiotic (e.g., mineral surfaces) consumers compete for resources necessary for life (e.g., nitrogen, phosphorus). This competition is ecologically significant, since it regulates the dynamics of soil nutrients and controls aboveground plant productivity. Here we develop, calibrate, and test a nutrient competition model that accounts for multiple soil nutrients interacting with multiple biotic and abiotic consumers. As applied here for tropical forests, the Nutrient COMpetition model (N-COM) includes three primary soil nutrients (NH4+, NO3?, and POx (representing the sum of PO43?, HPO42?, and H2PO4?)) and five potential competitors (plantmore »roots, decomposing microbes, nitrifiers, denitrifiers, and mineral surfaces). The competition is formulated with a quasi-steady-state chemical equilibrium approximation to account for substrate (multiple substrates share one consumer) and consumer (multiple consumers compete for one substrate) effects. N-COM successfully reproduced observed soil heterotrophic respiration, N2O emissions, free phosphorus, sorbed phosphorus, and free NH4+ at a tropical forest site (Tapajos). The overall model posterior uncertainty was moderately well constrained. Our sensitivity analysis revealed that soil nutrient competition was primarily regulated by consumer-substrate affinity rather than environmental factors such as soil temperature or soil moisture. Our results imply that the competitiveness (from most to least competitive) followed this order: (1) for NH4+, nitrifiers ~ decomposing microbes > plant roots, (2) for NO3?, denitrifiers ~ decomposing microbes > plant roots, (3) for POx, mineral surfaces > decomposing microbes ~ plant roots. Although smaller, plant relative competitiveness is of the same order of magnitude as microbes. We then applied the N-COM model to analyze field nitrogen and phosphorus perturbation experiments in two tropical forest sites (in Hawaii and Puerto Rico) not used in model development or calibration. Under soil inorganic nitrogen and phosphorus elevated conditions, the model accurately replicated the experimentally observed competition among different nutrient consumers. Although we used as many observations as we could obtain, more nutrient addition experiments in tropical systems would greatly benefit model testing and calibration. In summary, the N-COM model provides an ecologically consistent representation of nutrient competition appropriate for land BGC models integrated in Earth System Models.« less

  3. Global Dynamics of Zooplankton and Harmful Algae in Flowing Habitats

    E-Print Network [OSTI]

    Hsu, Sze-Bi

    Global Dynamics of Zooplankton and Harmful Algae in Flowing Habitats Sze-Bi Hsu Feng-Bin Wang Xiao from the dynamics of harmful algae and zooplankton in flowing- water habitats where a main channel. For the system modeling the dynamics of algae and their toxin that contains little limiting nutrient, we

  4. Trace anomaly on a quantum spacetime manifold

    SciTech Connect (OSTI)

    Spallucci, Euro; Smailagic, Anais; Nicolini, Piero

    2006-04-15

    In this paper we investigate the trace anomaly in a space-time where single events are delocalized as a consequence of short distance quantum coordinate fluctuations. We obtain a modified form of heat kernel asymptotic expansion which does not suffer from short distance divergences. Calculation of the trace anomaly is performed using an IR regulator in order to circumvent the absence of UV infinities. The explicit form of the trace anomaly is presented and the corresponding 2D Polyakov effective action and energy-momentum tensor are obtained. The vacuum expectation value of the energy-momentum tensor in the Boulware, Hartle-Hawking and Unruh vacua is explicitly calculated in a rt section of a recently found, noncommutative inspired, Schwarzschild-like solution of the Einstein equations. The standard short distance divergences in the vacuum expectation values are regularized in agreement with the absence of UV infinities removed by quantum coordinate fluctuations.

  5. Paraxial ray-tracing approach for the simulation of ultrasonic inspection of welds

    SciTech Connect (OSTI)

    Gardahaut, Audrey; Jezzine, Karim [CEA, LIST, Digiteo Labs, Bât 565, PC 120, F-91191, Gif-sur-Yvette (France); Cassereau, Didier [CNRS, UMR 7623, LIP, 15 rue de l'école de médecine, 75006 Paris, France and ESPCI ParisTech, 10 rue Vauquelin, 75005 Paris (France)

    2014-02-18

    On-site inspection of bimetallic or austenitic welds can be very difficult to interpret owing to their internal structures. Skewing and splitting of the ultrasonic beam may occur due to the anisotropic and inhomogeneous properties of the welding material. In this paper, we present a ray-based method to simulate the propagation of ultrasonic waves in such structures. The formalism is based on dynamic ray tracing system in Cartesian coordinates along a reference ray. Standard ray tracing consists in the solution of a system of linear ordinary differential equations of the first order and is used to determine the trajectory of the ray. Likewise, dynamic ray tracing (DRT) also called paraxial ray tracing consists in the solution of an additional system of linear ordinary differential equations along the ray allowing paraxial quantities to be computed. It is used to evaluate the geometrical spreading and amplitude along the ray and in its vicinity. DRT is applied on a smooth representation of the elastic properties of the weld obtained thanks to an image processing technique applied on a macrograph of the weld. Simulation results are presented and compared to finite elements and experimental results.

  6. Nutrient load analysis of Lago de Yojoa, Honduras

    E-Print Network [OSTI]

    Trate, Tia M. (Tia Marie)

    2006-01-01

    Lake Yojoa, Honduras is an important natural resource to the people of Honduras. The lake's water quality has been a controversial subject. This thesis describes a nutrient load analysis performed to gain a better understanding ...

  7. COMPOST INFORMATION SHEET MSU SOIL & PLANT NUTRIENT LABORATORY

    E-Print Network [OSTI]

    Isaacs, Rufus

    COMPOST INFORMATION SHEET MSU SOIL & PLANT NUTRIENT LABORATORY 1066 BOGUE ST. ROOM A81 EAST LANSING _______________________________________________________________________ SAMPLE IDENTIFICATION:___________________________ COUNTY: ________________ COMPOST TYPE: LEAF COMPOST MSW COMPOST MANURE COMPOST OTHER: (specify) ____________________________________________________ TEST

  8. Spent fuel pool analysis using TRACE code

    SciTech Connect (OSTI)

    Sanchez-Saez, F.; Carlos, S.; Villanueva, J. F.; Martorell, S.

    2012-07-01

    The storage requirements of Spent Fuel Pools have been analyzed with the purpose to increase their rack capacities. In the past, the thermal limits have been mainly evaluated with conservative codes developed for this purpose, although some works can be found in which a best estimate code is used. The use of best estimate codes is interesting as they provide more realistic calculations and they have the capability of analyzing a wide range of transients that could affect the Spent Fuel Pool. Two of the most representative thermal-hydraulic codes are RELAP-5 and TRAC. Nowadays, TRACE code is being developed to make use of the more favorable characteristics of RELAP-5 and TRAC codes. Among the components coded in TRACE that can be used to construct the model, it is interesting to use the VESSEL component, which has the capacity of reproducing three dimensional phenomena. In this work, a thermal-hydraulic model of the Maine Yankee spent fuel pool using the TRACE code is developed. Such model has been used to perform a licensing calculation and the results obtained have been compared with experimental measurements made at the pool, showing a good agreement between the calculations predicted by TRACE and the experimental data. (authors)

  9. Privacy Vulnerability of Published Anonymous Mobility Traces

    E-Print Network [OSTI]

    2012-08-01

    Energy; and the National Natural Science Foundation of China (NSFC) under. Grant No. ... conversations, news articles, online social networks, or Web blogs, though the ... or transition probabilities of each user between locations. Chow et al. .... is reasonable if the objective of the adversary is to identify as many trace ...

  10. Privacy Vulnerability of Published Anonymous Mobility Traces

    E-Print Network [OSTI]

    2010-07-07

    Sep 20, 2010 ... a function of the nodal mobility (captured in both real and synthetic traces), the ... Systems; K.6.5 [Management of Computing and Infor- mation Systems]: Security and ..... We first describe them for case A1: (1) MLE Approach ...

  11. Nutrient Availability Alters the Effect of Autophagy on Sulindac Sulfide-Induced Colon Cancer Cell Apoptosis

    E-Print Network [OSTI]

    Chiou, Shiun-Kwei; Hoa, Neil; Ge, Lisheng; Jadus, Martin R

    2012-01-01

    Research Article Nutrient Availability Alters the Effect ofapoptosis depending on availability of nutri- ents in the

  12. Steam Tracing...New Technologies for the 21st Century 

    E-Print Network [OSTI]

    Pitzer, R. K.; Barth, R. E.; Bonorden, C.

    1999-01-01

    For decades, steam tracing has been an accepted practice in the heating of piping, vessels, and equipment. This paper presents recent product innovations such as "burn-safe" and "energy efficient" steam tracing products. For the many applications...

  13. 12.479 Trace-Element Geochemistry, Spring 2009

    E-Print Network [OSTI]

    Frey, Frederick

    The emphasis of this course is to use Trace Element Geochemistry to understand the origin and evolution of igneous rocks. The approach is to discuss the parameters that control partitioning of trace elements between phases ...

  14. Interplay between excitation kinetics and reaction-center dynamics in purple bacteria

    E-Print Network [OSTI]

    Felipe Caycedo-Soler; Ferney J. Rodríguez; Luis Quiroga; Neil F. Johnson

    2010-08-31

    Photosynthesis is arguably the fundamental process of Life, since it enables energy from the Sun to enter the food-chain on Earth. It is a remarkable non-equilibrium process in which photons are converted to many-body excitations which traverse a complex biomolecular membrane, getting captured and fueling chemical reactions within a reaction-center in order to produce nutrients. The precise nature of these dynamical processes -- which lie at the interface between quantum and classical behaviour, and involve both noise and coordination -- are still being explored. Here we focus on a striking recent empirical finding concerning an illumination-driven transition in the biomolecular membrane architecture of {\\it Rsp. Photometricum} purple bacteria. Using stochastic realisations to describe a hopping rate model for excitation transfer, we show numerically and analytically that this surprising shift in preferred architectures can be traced to the interplay between the excitation kinetics and the reaction center dynamics. The net effect is that the bacteria profit from efficient metabolism at low illumination intensities while using dissipation to avoid an oversupply of energy at high illumination intensities.

  15. Ambient methods and apparatus for rapid laser trace constituent analysis

    DOE Patents [OSTI]

    Snyder, Stuart C. (Idaho Falls, ID); Partin, Judy K. (Idaho Falls, ID); Grandy, Jon D. (Idaho Falls, ID); Jeffery, Charles L. (Blackfoot, ID)

    2002-01-01

    A method and apparatus are disclosed for measuring trace amounts of constituents in samples by using laser induced breakdown spectroscopy and laser induced fluorescence under ambient conditions. The laser induced fluorescence is performed at a selected wavelength corresponding to an absorption state of a selected trace constituent. The intensity value of the emission decay signal which is generated by the trace constituent is compared to calibrated emission intensity decay values to determine the amount of trace constituent present.

  16. Trace element concentrations in melanotic swine

    SciTech Connect (OSTI)

    Sherman, R.M.; Parkinson, T.F.; Veit, H.P.

    1983-10-01

    A number of investigations have been made on the role of certain trace elements in oncogenesis. In prior work, it was found that manganese and zinc concentrations in human skin cancers differed markedly from the values in normal tissue./sub 1/ The purpose of the present research was to determine trace element concentrations in skin and other tissues of normal and melanotic miniature swine. In-vivo determinations of skin tissue were carried out using x-ray fluorescence analysis (XRFA) while tissue biopsies were measured using instrumental neutron activation analysis (INAA). If significant differences between normal and cancerous skin tissues can be established, the former method should prove valuable as a rapid noninvasive diagnostic method.

  17. Trace anomaly of the conformal gauge field

    E-Print Network [OSTI]

    Sladkowski, J

    1993-01-01

    The proposed by Bastianelli and van Nieuwenhuizen new method of calculations of trace anomalies is applied in the conformal gauge field case. The result is then reproduced by the heat equation method. An error in previous calculation is corrected. It is pointed out that the introducing gauge symmetries into a given system by a field-enlarging transformation can result in unexpected quantum effects even for trivial configurations.

  18. Method and apparatus for determining nutrient stimulation of biological processes

    DOE Patents [OSTI]

    Colwell, F.S.; Geesey, G.G.; Gillis, R.J.; Lehman, R.M.

    1999-07-13

    A method and apparatus are disclosed for determining the nutrients to stimulate microorganisms in a particular environment. A representative sample of microorganisms from a particular environment are contacted with multiple support means wherein each support means has intimately associated with the surface of the support means a different nutrient composition for microorganisms in the sample. The multiple support means is allowed to remain in contact with the microorganisms in the sample for a time period sufficient to measure difference in microorganism effects for the multiple support means. Microorganism effects for the multiple support means are then measured and compared. The invention is particularly adaptable to being conducted in situ. The additional steps of regulating nutrients added to the particular environment of microorganisms can enhance the desired results. Biological systems particularly suitable for this invention are bioremediation, biologically enhanced oil recovery, biological leaching of metals, and agricultural bioprocesses. 5 figs.

  19. Method and apparatus for determining nutrient stimulation of biological processes

    DOE Patents [OSTI]

    Colwell, F.S.; Geesey, G.G.; Gillis, R.J.; Lehman, R.M.

    1997-11-11

    A method and apparatus is described for determining the nutrients to stimulate microorganisms in a particular environment. A representative sample of microorganisms from a particular environment are contacted with multiple support means wherein each support means has intimately associated with the surface of the support means a different nutrient composition for said microorganisms in said sample. The multiple support means is allowed to remain in contact with the microorganisms in the sample for a time period sufficient to measure differences in microorganism effects for the multiple support means. Microorganism effects for the multiple support means are then measured and compared. The invention is particularly adaptable to being conducted in situ. The additional steps of regulating nutrients added to the particular environment of microorganisms can enhance the desired results. Biological systems particularly suitable for this invention are bioremediation, biologically enhanced oil recovery, biological leaching of metals, and agricultural bioprocesses. 5 figs.

  20. Quasistatic dynamical systems

    E-Print Network [OSTI]

    Neil Dobbs; Mikko Stenlund

    2015-04-08

    We introduce the notion of a quasistatic dynamical system, which generalizes that of an ordinary dynamical system. Quasistatic dynamical systems are inspired by the namesake processes in thermodynamics, which are idealized processes where the observed system transforms (infinitesimally) slowly due to external influence, tracing out a continuous path of thermodynamic equilibria over an (infinitely) long time span. Time-evolution of states under a quasistatic dynamical system is entirely deterministic, but choosing the initial state randomly renders the process a stochastic one. In the prototypical setting where the time-evolution is specified by strongly chaotic maps on the circle, we obtain a description of the statistical behaviour as a stochastic diffusion process, under surprisingly mild conditions on the initial distribution, by solving a well-posed martingale problem. We also consider various admissible ways of centering the process, with the curious conclusion that the "obvious" centering suggested by the initial distribution sometimes fails to yield the expected diffusion.

  1. Toward an integration of landscape and food web ecology: The dynamics of spatially subsidized food webs

    E-Print Network [OSTI]

    Polis, Gary A.; Anderson, Wendy B.; Holt, Robert D.

    1997-01-01

    We focus on the implications of movement, landscape variables, and spatial heterogeneity for food web dynamics. Movements of nutrients, detritus, prey, and consumers among habitats are ubiquitous in diverse biomes and can ...

  2. 1. Introduction to the relative trace formula Give an idea of the relative trace formula along any of the sources [CPS90,

    E-Print Network [OSTI]

    Ould Ahmedou, Mohameden

    1. Introduction to the relative trace formula Give an idea of the relative trace formula along any (91h:11042) [Jac05] Herv´e Jacquet, A guide to the relative trace formula, Automorphic representations2192826 (2006g:11100) [Lap10] Erez M. Lapid, Some applications of the trace formula and the relative trace

  3. ORIGINAL PAPER Implication of nutrient and salinity interaction

    E-Print Network [OSTI]

    . Treatments consisted of four nutrient concentrations and four non-lethal salinity levels; plant response freshwater inflow. We propose salinity should remain a primary concern in restora- tion plans targeted wastewater effluent is the source (Alexander and Dunton 2006). Predicting the size and magnitude of effected

  4. Original article Belowground biomass and nutrient content in a

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    useful when using estimates of the aerial biomass of a stand to calculate the carbon storage content of the belowground compartment. Douglas-fir / root system / C sequestration / nutrient content carbone dans le compartiment souterrain, connaissant la biomasse aérienne d'un peuplement. Pour ce qui

  5. Nutrient Management Module No. 13 Regulation and Management

    E-Print Network [OSTI]

    Lawrence, Rick L.

    , as seen in Table 1. Additional manure characteristics can be found in NRCS's Agricultural Waste Management and swine manure contain about as much N as commercial fertilizer applied to cropland each year (DEQ, 1996Nutrient Management Module No. 13 Manure and Biosolids: Regulation and Management by Clain Jones

  6. Nutrient Management, Mississippi 2004 Larry Oldham, Ph.D.

    E-Print Network [OSTI]

    of Cropping Management Systems for the Brown Loam Area of Mississippi Animal By-Product Related Nutrient Pasteurized Broiler Litter Pellets for Tomato Production #12;Safety and Efficacy of Composted Broiler Litter Nematode Parasite in Cotton Composted Litter Safety and Efficacy on Truck Crops #12;Use of Breeder Litter

  7. Distribution and speciation of trace elements in iron and manganese oxide cave deposits

    SciTech Connect (OSTI)

    Frierdich, Andrew J.; Catalano, Jeffrey G. (WU)

    2012-10-24

    Fe and Mn oxide minerals control the distribution and speciation of heavy metals and trace elements in soils and aquatic systems through chemical mechanisms involving adsorption, incorporation, and electron transfer. The Pautler Cave System in Southwest Illinois, an analog to other temperate carbonate-hosted karst systems, contains Fe and Mn oxide minerals that form in multiple depositional environments and have high concentrations of associated trace elements. Synchrotron-based micro-scanning X-ray fluorescence ({mu}-SXRF) shows unique spatial distributions of Fe, Mn, and trace elements in mineral samples. Profile maps of Mn oxide cave stream pebble coatings show Fe- and As-rich laminations, indicating dynamic redox conditions in the cave stream. {mu}-SXRF maps demonstrate that Ni, Cu, and Zn correlate primarily with Mn whereas As correlates with both Mn and Fe; As is more enriched in the Fe phase. Zn is concentrated in the periphery of Mn oxide stream pebble coatings, and may be an indication of recent anthropogenic surface activity. X-ray absorption fine structure spectroscopy measurements reveal that As(V) occurs as surface complexes on Mn and Fe oxides whereas Zn(II) associated with Mn oxides is adsorbed to the basal planes of phyllomanganates in a tetrahedral coordination. Co(III) and Se(IV) are also observed to be associated with Mn oxides. The observation of Fe, Mn, and trace element banding in Mn oxide cave stream pebble coatings suggests that these materials are sensitive to and document aqueous redox conditions, similar to ferromanganese nodules in soils and in marine and freshwater sediments. Furthermore, speciation and distribution measurements indicate that these minerals scavenge trace elements and limit the transport of micronutrients and contaminants in karst aquifer systems while also potentially recording changes in anthropogenic surface activity and land-use.

  8. Influences on the oceanic biogeochemical cycling of the hybrid-type metals, cobalt, iron, and manganese

    E-Print Network [OSTI]

    Noble, Abigail Emery

    2012-01-01

    Trace metal cycling is one of many processes that influence ocean ecosystem dynamics. Cobalt, iron, and manganese are redox active trace metal micro-nutrients with oceanic distributions that are influenced by both biological ...

  9. Oceanic nutrient and oxygen transports and bounds on export production during the World Ocean Circulation Experiment

    E-Print Network [OSTI]

    Wunsch, Carl

    Oceanic nutrient and oxygen transports and bounds on export production during the World Ocean about 100 m). Because of correlations between errors, the export production becomes significant when cycling; 4863 Oceanography: Biological and Chemical: Sedimentation; KEYWORDS: export production, nutrient

  10. Research Article Effects of spawning salmon on dissolved nutrients and epilithon

    E-Print Network [OSTI]

    Lamberti, Gary A.

    and freshwater ecosystems. Through- out the northern Pacific Rim, millions of Pacific salmon (Oncorhynchus spp migrations of Pacific salmon (Oncorhynchus spp.) represent a significant nutrient pulse to freshwater. Pacific salmon; salmon-derived nutrients; estuaries; streams; water chemistry; epilithon. Introduction

  11. Evaluations of nutrient diffusing substrates and the primary importance of light in controlling periphyton 

    E-Print Network [OSTI]

    Murawski, Matthew Thomas

    2001-01-01

    eutrophication. In the first study, artificial channels were used to investigate the response of periphyton to different nutrient delivery mechanisms. In two channels, nutrients were delivered via diffusion to periphyton growth surfaces using modified Matlock...

  12. Workshop on L-functions and Trace Formula - Department of ...

    E-Print Network [OSTI]

    $author.value

    A working workshop, aimed at reporting the latest progress on the subject. ... of spectral terms in what I called the stabilization of the (hypothetical) r-trace formula

  13. TRACE IDENTIFICATION OF CESIUM AND SODIUM IN NEUTRAL BEAM RESEARCH

    E-Print Network [OSTI]

    Ruby, L.

    2010-01-01

    TRACE IDENTIFICATION OF CESIUM AND Lawrence Ruby LawrenceBerkeley, California 94720 Cesium and sodium in vapor formthe extent to which the cesium and sodium migrate in the

  14. Trace-Element Distribution In An Active Hydrothermal System,...

    Open Energy Info (EERE)

    trace-element dispersion patterns. Multielement analyses of surface rock samples, soil samples and drill cuttings from deep exploration wells provide a three-dimensional...

  15. Tracing Technologies: Prisoners' Views in the Era of CSI

    E-Print Network [OSTI]

    Cole, SA

    2013-01-01

    Tracing Technologies: Prisoners’ Views in the Era of CSI.Studies, they argue that prisoners have ‘professionalinterview study of Austrian prisoners. The study design was

  16. Potential trace element emissions from the gasification of Illinois...

    Office of Scientific and Technical Information (OSTI)

    the gasification of Illinois coals. Duplicate determinations of 34 elements in coal and ash samples Citation Details In-Document Search Title: Potential trace element emissions...

  17. Magnetic Field Line Tracing Calculations for Conceptual PFC Design...

    Office of Scientific and Technical Information (OSTI)

    Conference: Magnetic Field Line Tracing Calculations for Conceptual PFC Design in the National Compact Stellarator Experiment Citation Details In-Document Search Title: Magnetic...

  18. Aggregation methods in food chains with nutrient recycling B.W. Kooi a,

    E-Print Network [OSTI]

    Poggiale, Jean-Christophe

    Aggregation methods in food chains with nutrient recycling B.W. Kooi a, *, J.C. Poggiale b , P rights reserved. Keywords: Aggregation methods; Batch reactor; Chemostat; Food chains; Nutrient recycling recycling is taken into account. The food chain is formed by a nutrient and two populations, prey

  19. M.V.W. Caldeira et al.Quantification of nutrient content of Acacia Original article

    E-Print Network [OSTI]

    Boyer, Edmond

    M.V.W. Caldeira et al.Quantification of nutrient content of Acacia Original article Quantification of nutrient content in above-ground biomass of young Acacia mearnsii De Wild., provenance Bodalla Marcos 28 November 2001) Abstract ­ The present study deals with the quantification of the nutrient content

  20. Simulation of annual biogeochemical cycles of nutrient balance, phytoplankton bloom(s), and DO in Puget Sound using an unstructured grid model

    SciTech Connect (OSTI)

    Khangaonkar, Tarang; Sackmann, Brandon S.; Long, Wen; Mohamedali, Teizeen; Roberts, Mindy

    2012-08-14

    Nutrient pollution from rivers, nonpoint source runoff, and nearly 100 wastewater discharges is a potential threat to the ecological health of Puget Sound with evidence of hypoxia in some basins. However, the relative contributions of loads entering Puget Sound from natural and anthropogenic sources, and the effects of exchange flow from the Pacific Ocean are not well understood. Development of a quantitative model of Puget Sound is thus presented to help improve our understanding of the annual biogeochemical cycles in this system using the unstructured grid Finite Volume Coastal Ocean Model (FVCOM) framework and the Integrated Compartment Model (CE QUAL-ICM) water quality kinetics. Results based on 2006 data show that phytoplankton growth and die-off, succession between two species of algae, nutrient dynamics, and dissolved oxygen in Puget Sound are strongly tied to seasonal variation of temperature, solar radiation, and the annual exchange and flushing induced by upwelled Pacific Ocean waters. Concentrations in the mixed outflow surface layer occupying approximately 5?20 m of the upper water column show strong effects of eutrophication from natural and anthropogenic sources, spring and summer algae blooms, accompanied by depleted nutrients but high dissolved oxygen levels. The bottom layer reflects dissolved oxygen and nutrient concentrations of upwelled Pacific Ocean water modulated by mixing with biologically active surface outflow in the Strait of Juan De Fuca prior to entering Puget Sound over the Admiralty Inlet. The effect of reflux mixing at the Admiralty Inlet sill resulting in lower nutrient and higher dissolved oxygen levels in bottom waters of Puget Sound than the incoming upwelled Pacific Ocean water is reproduced. By late winter, with the reduction in algal activity, water column constituents of interest, were renewed and the system appeared to reset with cooler temperature, higher nutrient, and higher dissolved oxygen waters from the Pacific Ocean.

  1. The biogeochemistry of marine particulate trace metals

    E-Print Network [OSTI]

    Ohnemus, Daniel Chester

    2014-01-01

    Marine particles include all living and non-living solid components of seawater, representing an extremely dynamic and chemically diverse mixture of phases. The distributions of these phases are poorly constrained and ...

  2. Effect of submergence on alleviation of soil acidity and availability of nutrients in a rice-rice ecosystem

    E-Print Network [OSTI]

    Bhaskaran, Usha Pankajam Dr.; Varghese, Thomas Dr

    2009-01-01

    the kinetics of the availability of nutrients. Soil sampleswas noticed. Phosphorus availability increased in all soilsof Kerala to increase pH, availability of nutrients and to

  3. Spark discharge trace element detection system

    DOE Patents [OSTI]

    Adler-Golden, S.; Bernstein, L.S.; Bien, F.

    1988-08-23

    A spark discharge trace element detection system is provided which includes a spark chamber including a pair of electrodes for receiving a sample of gas to be analyzed at no greater than atmospheric pressure. A voltage is provided across the electrodes for generating a spark in the sample. The intensity of the emitted radiation in at least one primary selected narrow band of the radiation is detected. Each primary band corresponds to an element to be detected in the gas. The intensity of the emission in each detected primary band is integrated during the afterglow time interval of the spark emission and a signal representative of the integrated intensity of the emission in each selected primary bond is utilized to determine the concentration of the corresponding element in the gas. 12 figs.

  4. Can the trace formula describe weak localisation?

    E-Print Network [OSTI]

    Robert S. Whitney; Igor V. Lerner; Robert A. Smith

    1999-02-24

    We attempt to systematically derive perturbative quantum corrections to the Berry diagonal approximation of the two-level correlation function (TLCF) for chaotic systems. To this end, we develop a ``weak diagonal approximation'' based on a recent description of the first weak localisation correction to conductance in terms of the Gutzwiller trace formula. This semiclassical method is tested by using it to derive the weak localisation corrections to the TLCF for a semiclassically disordered system. Unfortunately the method is unable to correctly reproduce the ``Hikami boxes'' (the relatively small regions where classical paths are glued together by quantum processes). This results in the method failing to reproduce the well known weak localisation expansion. It so happens that for the first order correction it merely produces the wrong prefactor. However for the second order correction, it is unable to reproduce certain contributions, and leads to a result which is of a different form to the standard one.

  5. Holographic Trace Anomaly and Local Renormalization Group

    E-Print Network [OSTI]

    Rajagopal, Srivatsan; Zhu, Yechao

    2015-01-01

    The Hamilton-Jacobi method in holography has produced important results both at a renormalization group (RG) fixed point and away from it. In this paper we use the Hamilton-Jacobi method to compute the holographic trace anomaly for four- and six-dimensional boundary conformal field theories (CFTs), assuming higher-derivative gravity and interactions of scalar fields in the bulk. The scalar field contributions to the anomaly appear in CFTs with exactly marginal operators. Moving away from the fixed point, we show that the Hamilton-Jacobi formalism provides a deep connection between the holographic and the local RG. We derive the local RG equation holographically, and verify explicitly that it satisfies Weyl consistency conditions stemming from the commutativity of Weyl scalings. We also consider massive scalar fields in the bulk corresponding to boundary relevant operators, and comment on their effects to the local RG equation.

  6. Holographic Trace Anomaly and Local Renormalization Group

    E-Print Network [OSTI]

    Srivatsan Rajagopal; Andreas Stergiou; Yechao Zhu

    2015-08-19

    The Hamilton-Jacobi method in holography has produced important results both at a renormalization group (RG) fixed point and away from it. In this paper we use the Hamilton-Jacobi method to compute the holographic trace anomaly for four- and six-dimensional boundary conformal field theories (CFTs), assuming higher-derivative gravity and interactions of scalar fields in the bulk. The scalar field contributions to the anomaly appear in CFTs with exactly marginal operators. Moving away from the fixed point, we show that the Hamilton-Jacobi formalism provides a deep connection between the holographic and the local RG. We derive the local RG equation holographically, and verify explicitly that it satisfies Weyl consistency conditions stemming from the commutativity of Weyl scalings. We also consider massive scalar fields in the bulk corresponding to boundary relevant operators, and comment on their effects to the local RG equation.

  7. Food processing wastes as nutrient sources in algal growth

    SciTech Connect (OSTI)

    Wong, M-H; Chan, W-C; Chu, L-M

    1983-03-01

    Utilization of food processing wastes for biological production will ease part of the disposal problem, especially the potential hazards of eutrophication, andat the same time recycle the inherently rich plant nutrients in the waste materials. The present investigation is an attempt to study the feasibility of using five food processing wastes, including carrot, coconut, eggshell, soybean, and sugarcane, for culturing Chlorella pyrenoidosa (a unicellular green alga).

  8. HANKEL OPERATORS AND THE DIXMIER TRACE ON STRICTLY PSEUDOCONVEX DOMAINS

    E-Print Network [OSTI]

    Zhang, Genkai

    = [Tf2 , Tf1 ] . . . [Tf2n , Tf2n-1 ] is never trace-class if n > 1. 1991 Mathematics Subject research plan no. MSM4781305904, and the Swedish Research Council (VR). Typeset by AMS-TEX 1 #12;2 M) to the unit ball Bn , n > 1, in a different direction -- using the Dixmier trace. This may be notable

  9. Climate change and trace gases BY JAMES HANSEN

    E-Print Network [OSTI]

    Ford, Andrew

    Climate change and trace gases BY JAMES HANSEN 1,*, MAKIKO SATO 1 , PUSHKER KHARECHA 1 , GARY climate change that could run out of our control, with great dangers for humans and other creatures and the global environment. Keywords: climate change; trace gases; climate feedbacks; black carbon; sea level

  10. Coherent Ray Tracing for Complex Light Transport Effects

    E-Print Network [OSTI]

    Columbia University

    soft shadows from area light sources, large ray packets for real-time Whitted ray tracing, and adaptive lighting, depth of field, motion blur, and diffuse inter-reflections. This is an adaptive Monte CarloCoherent Ray Tracing for Complex Light Transport Effects Ryan S. Overbeck Advised by: Ravi

  11. ANIMAL TRACING: BENEFITS IN CATTLE INDUSTRY AND PRIVATE INCENTIVES

    E-Print Network [OSTI]

    McCarl, Bruce A.

    ANIMAL TRACING: BENEFITS IN CATTLE INDUSTRY AND PRIVATE INCENTIVES LEVAN ELBAKIDZE Assistant are those of the author and not necessarily the sponsor." #12;ANIMAL TRACING: BENEFITS IN CATTLE INDUSTRY major economic damages in the cattle industry. One of the strategies to mitigate potential outbreak

  12. Tracing Cattle Breeds with Principal Components Analysis Ancestry Informative SNPs

    E-Print Network [OSTI]

    Paschou, Peristera

    Tracing Cattle Breeds with Principal Components Analysis Ancestry Informative SNPs Jamey Lewis1 that can be used to trace the breed of unknown cattle samples. Taking advantage of the power of Principal the origin of individual cattle. In doing so, we present a thorough examination of population genetic

  13. Nutrients and Nutrient Nutrient cycles

    E-Print Network [OSTI]

    Mitchell, Randall J.

    : 38,000 Fossil Fuels:Fossil Fuels: 25,000,00025,000,000 Limestone,Limestone, Dolomite:Dolomite: 18 to atmosphere currently exceed outputs because of - Fossil fuel burning - Vegetation burning - Reduced primary

  14. Trace Assessment for BWR ATWS Analysis

    SciTech Connect (OSTI)

    Cheng, L.Y.; Diamond, D.; Arantxa Cuadra, Gilad Raitses, Arnold Aronson

    2010-04-22

    A TRACE/PARCS input model has been developed in order to be able to analyze anticipated transients without scram (ATWS) in a boiling water reactor. The model is based on one developed previously for the Browns Ferry reactor for doing loss-of-coolant accident analysis. This model was updated by adding the control systems needed for ATWS and a core model using PARCS. The control systems were based on models previously developed for the TRAC-B code. The PARCS model is based on information (e.g., exposure and moderator density (void) history distributions) obtained from General Electric Hitachi and cross sections for GE14 fuel obtained from an independent source. The model is able to calculate an ATWS, initiated by the closure of main steam isolation valves, with recirculation pump trip, water level control, injection of borated water from the standby liquid control system and actuation of the automatic depres-surization system. The model is not considered complete and recommendations are made on how it should be improved.

  15. Trace metal composition of suspended particulate matter in the water column of the Black Sea

    E-Print Network [OSTI]

    Murray, James W.

    Trace metal composition of suspended particulate matter in the water column of the Black Sea Ouz Keywords: Black Sea Geochemistry Biogeochemistry Biogeochemical cycle Trace metals Trace elements Tracers Particulates Suspended particulate matter Biogenic matter Biogenic material Plankton Planktonic metal

  16. Simulation of radiation damping in rings, using stepwise ray-tracing methods

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

    Meot, F.

    2015-06-26

    The ray-tracing code Zgoubi computes particle trajectories in arbitrary magnetic and/or electric field maps or analytical field models. It includes a built-in fitting procedure, spin tracking many Monte Carlo processes. The accuracy of the integration method makes it an efficient tool for multi-turn tracking in periodic machines. Energy loss by synchrotron radiation, based on Monte Carlo techniques, had been introduced in Zgoubi in the early 2000s for studies regarding the linear collider beam delivery system. However, only recently has this Monte Carlo tool been used for systematic beam dynamics and spin diffusion studies in rings, including eRHIC electron-ion collider projectmore »at the Brookhaven National Laboratory. Some beam dynamics aspects of this recent use of Zgoubi capabilities, including considerations of accuracy as well as further benchmarking in the presence of synchrotron radiation in rings, are reported here.« less

  17. Towards Dynamic Pricing-Based Collaborative Optimizations for Green Data Centers

    E-Print Network [OSTI]

    Plotkin, Joshua B.

    . Meanwhile, market penetration of intermittent renewable energy sources (e.g., wind and solar) is on the rise using real intermittent-energy-generation trace data. Modeling the dynamic price over this trace, we energy efficiency is therefore a shared problem between both electric utilities and data centers. Data

  18. Trace elements in oil shale. Progress report, 1979-1980

    SciTech Connect (OSTI)

    Chappell, W R

    1980-01-01

    The purpose of this research program is to understand the potential impact of an oil shale industry on environmental levels of trace contaminants in the region. The program involves a comprehensive study of the sources, release mechanisms, transport, fate, and effects of toxic trace chemicals, principally the trace elements, in an oil shale industry. The overall objective of the program is to evaluate the environmental and health consequences of the release of toxic trace elements by shale and oil production and use. The baseline geochemical survey shows that stable trace elements maps can be constructed for numerous elements and that the trends observed are related to geologic and climatic factors. Shale retorted by above-ground processes tends to be very homogeneous (both in space and in time) in trace element content. Leachate studies show that significant amounts of B, F, and Mo are released from retorted shales and while B and Mo are rapidly flushed out, F is not. On the other hand, As, Se, and most other trace elements are not present in significant quantities. Significant amounts of F and B are also found in leachates of raw shales. Very large concentrations of reduced sulfur species are found in leachates of processed shale. Very high levels of B and Mo are taken up in some plants growing on processed shale with and without soil cover. There is a tendency for some trace elements to associate with specific organic fractions, indicating that organic chelation or complexation may play an important role. Many of the so-called standard methods for analyzing trace elements in oil shale-related materials are inadequate. A sampling manual is being written for the environmental scientist and practicing engineer. A new combination of methods is developed for separating the minerals in oil shale into different density fractions. Microbial investigations have tentatively identified the existence of thiobacilli in oil shale materials such as leachates. (DC)

  19. Rapid and gradual modes of aerosol trace metal dissolution in seawater

    E-Print Network [OSTI]

    Mackey, KRM; Chien, CT; Post, AF; Saito, MA; Paytan, A

    2015-01-01

    Atlantic,” in Trace Metals in Seawater, NATO Conferencesolubility of trace metals from natural and anthropogenicresponses to atmospheric metal deposi- tion in the coastal

  20. L-?Functions and Trace Formula Workshop Schedule

    E-Print Network [OSTI]

    2015-05-11

    L-?Functions and Trace Formula Workshop Schedule. May 11 – May 13, 2015 at Purdue University. Monday, May 11. 9:15 am – 9:30 am: Casselman/Shahidi:.

  1. Tax Deduction Qualified Software: TRACE Version 6.3.2

    Broader source: Energy.gov [DOE]

    Provides required documentation that the TRACE version 6.3.2 meets Internal Revenue Code §179D (c)(1) and (d) Regulations Notice 2006-52, Section 6 requirements as amplified by Notice 2008-40, Section 4 requirements.

  2. Trace formulas for fourth order operators on unit interval, II

    E-Print Network [OSTI]

    Andrey Badanin; Evgeny Korotyaev

    2014-12-16

    We consider self-adjoint fourth order operators on the unit interval with the Dirichlet type boundary conditions. For such operators we determine few trace formulas, similar to the case of Gelfand--Levitan formulas for second order operators.

  3. Ichnotaxonomic assessment of Mazon Creek area trace fossils, Illinois, USA

    E-Print Network [OSTI]

    LoBue, David J.

    2010-08-12

    The Francis Creek Shale Member (FCSM) of the Mid-Pennsylvanian Carbondale Formation along Mazon Creek in northern Illinois is known for soft-bodied organisms preserved within siderite concretions. Trace fossils, though ...

  4. Laboratory measurements and modeling of trace atmospheric species

    E-Print Network [OSTI]

    Sheehy, Philip M. (Philip Michael)

    2005-01-01

    Trace species play a major role in many physical and chemical processes in the atmosphere. Improving our understanding of the impact of each species requires a combination of laboratory exper- imentation, field measurements, ...

  5. TRACING FLUID SOURCES IN THE COSO GEOTHERMAL SYSTEM USING FLUID...

    Open Energy Info (EERE)

    TRACING FLUID SOURCES IN THE COSO GEOTHERMAL SYSTEM USING FLUID-INCLUSION GAS CHEMISTRY Jump to: navigation, search OpenEI Reference LibraryAdd to library Conference Proceedings:...

  6. Vascular flora and gradient analysis of the Natchez Trace Parkway 

    E-Print Network [OSTI]

    Phillips, Nena Mae Monique

    2009-06-02

    Vascular plant collections were made on the Natchez Trace Parkway over a 15 month period beginning in August 2004. These collections along with previous work done by the National Park Service (NPS) produced a flora of 750 ...

  7. Understanding reservoir mechanisms using phase and component streamline tracing 

    E-Print Network [OSTI]

    Kumar, Sarwesh

    2009-05-15

    Conventionally streamlines are traced using total flux across the grid cell faces. The visualization of total flux streamlines shows the movement of flood, injector-producer relationship, swept area and movement of tracer. ...

  8. Technique for identifying, tracing, or tracking objects in image data

    DOE Patents [OSTI]

    Anderson, Robert J. (Albuquerque, NM); Rothganger, Fredrick (Albuquerque, NM)

    2012-08-28

    A technique for computer vision uses a polygon contour to trace an object. The technique includes rendering a polygon contour superimposed over a first frame of image data. The polygon contour is iteratively refined to more accurately trace the object within the first frame after each iteration. The refinement includes computing image energies along lengths of contour lines of the polygon contour and adjusting positions of the contour lines based at least in part on the image energies.

  9. Trace determination of lead by helium-4 activation analysis 

    E-Print Network [OSTI]

    Vargas Bernal, Maria E.

    1984-01-01

    TRACE DETERMINATION OF LEAD BY HELIUM-4 ACTIVATION ANALYSIS A Thesis by MARIA E. VARGAS BERNAL Submitted to the Graduate College of Texas ARM University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE August... 1984 Major Subject: Chemistry TRACE DETERMINATION OF LEAD BY HELIUM-4 ACTIVATION ANALYSIS A Thesis by MARIA E. VARGAS BERNAL Approved as to style and format by: Emile A. Schweikert (Chairman of Committee) Marvin W. Rowe (Member) Gerald A. Sc...

  10. Algae-to-Fuel: Integrating Thermochemical Conversion, Nutrient Recycling, and Wastewater

    Broader source: Energy.gov [DOE]

    Breakout Session 2-C: Biogas and Beyond: Challenges and Opportunities for Advanced Biofuels from Wet-Waste FeedstocksAlgae-to-Fuel: Integrating Thermochemical Conversion, Nutrient Recycling, and...

  11. Arthur-Selberg trace formula CRM, June 30-July 3, 2009

    E-Print Network [OSTI]

    Lapid, Erez

    #12;#12;Arthur-Selberg trace formula Erez Lapid CRM, June 30-July 3, 2009 #12;Contents Applications of the Selberg Trace Formula 1. Weyl's law #12;Contents Applications of the Selberg Trace Formula 1. Weyl's law 2. Prime Geodesic Theorem #12;Contents Applications of the Selberg Trace Formula 1. Weyl's law 2. Prime

  12. Wastewater Discharge, Nutrient Loading, and Dissolved Oxygen Dynamics in a Shallow Texas Bay 

    E-Print Network [OSTI]

    Schroer, Lee Allen

    2014-05-07

    In Oso Bay, a wastewater treatment plant acts as a source of eutrophication and may have measureable impact on the health of the bay. The objectives of this study were to create a model for modeling dissolved oxygen concentrations over time...

  13. Irrigation Water Source: Effect on Soil Nutrient Dynamics and Microbial Community Composition 

    E-Print Network [OSTI]

    Holgate, Leon Carl

    2011-08-08

    Maintaining a supply of potable water is a growing concern in the USA, particularly in many southern and western states. One method of sustaining water supply in these areas is the use of greywater for commercial and residential landscape irrigation...

  14. Effects of geophagy on food intake, body mass, and nutrient dynamics of snowshoe hares (Lepus americanus)

    E-Print Network [OSTI]

    hares (Lepus americanus Erxleben, 1777) fed a formulated ration of feltleaf willow leaves (Salix'une ration formulée de feuilles de saule feutré (Salix alaxensis (Andersson) Coville), un aliment préféré des

  15. Carbon Dynamics in Aquatic Ecosystems in Response to Elevated Atmospheric CO2 and Altered Nutrients Availability

    E-Print Network [OSTI]

    Song, Chao

    2011-04-26

    Aquatic ecosystems will experience altered inorganic carbon, nitrogen and phosphorous availability in the future due to elevated atmospheric CO2, stronger stratification and anthropogenic activities. Despite its importance in modulating global...

  16. Tropical Pacific nutrient dynamics in the modern and pleistocene ocean : insights from the nitrogen isotope system

    E-Print Network [OSTI]

    Rafter, Patrick Anthony

    2009-01-01

    eastern equatorial Pacific Ocean during the past 3 M.Y. ,in the western tropical Pacific Ocean in the Holocene epoch,eastern tropical North Pacific Ocean, Mar. Chem. , 3, 271–

  17. Nutrient-stimulated biodegradation of aged refinery hydrocarbons in soil

    SciTech Connect (OSTI)

    Drake, E.N.; Stokley, K.E.; Calcavecchio, P.; Bare, R.E.; Rothenburger, S.J.; Prince, R.C. [Exxon Research and Engineering, Annandale, NJ (United States); Douglas, G.S. [Arthur D. Little, Inc., Cambridge, MA (United States)

    1995-12-31

    Aged hydrocarbon-contaminated refinery soil was amended with water and nutrients and tilled weekly for 1 year to stimulate biodegradation. Gas chromatography/mass spectrometry (GC/MS) analysis of polycyclic aromatic compounds (PAHs) and triterpane biomarkers, and Freon IR analysis of total petroleum hydrocarbons (TPH), were used to determine the extent of biodegradation. There was significant degradation of extractable hydrocarbon (up to 60%), but neither hopane, oleanane, nor the amount of polars decreased during this period of bioremediation, allowing them to be used as conserved internal markers for estimating biodegradation. Significant degradation of the more alkylated two- and three-ring compounds, and of the four-ring species pyrene and chrysene and their alkylated congeners, was seen. Substantial degradation (> 40%) of benzo(b)fluoranthene, benzo(k)fluoranthene, and benzo(a)pyrene also was seen. The results show that bioremediation can be a useful treatment in the cleanup of contaminated refinery sites.

  18. Effects of nutrient and CO2 availability on tolerance to herbivory in Brassica rapa

    E-Print Network [OSTI]

    Reekie, Ed

    by herbivores is generally thought to have a negative effect on plant fitness (Harper 1977; Belsky 1986; but seeEffects of nutrient and CO2 availability on tolerance to herbivory in Brassica rapa Carolyn B the effects of increased carbon and nutrient availability on the response of rapid cycling Brassica rapa

  19. LONG TERM RESIDUAL EFFECTS OF A NUTRIENT ADDITION ON A BARRIER ISLAND DUNE ECOSYSTEM

    E-Print Network [OSTI]

    Lawrence, Deborah

    LONG TERM RESIDUAL EFFECTS OF A NUTRIENT ADDITION ON A BARRIER ISLAND DUNE ECOSYSTEM by Susan M EFFECTS OF A NUTRIENT ADDITION ON A BARRIER ISLAND DUNE ECOSYSTEM Susan M. Heyel Old Dominion University, 2000 Director: Dr. Frank P. Day In 1991, 150 m2 were fertilized with nitrogen on three dunes on Hog

  20. Tracing interactions in HCGs through the HI

    E-Print Network [OSTI]

    L. Verdes-Montenegro; M. S. Yun; B. A. Williams; W. K. Huchtmeier; A. Del Olmo; J. Perea

    1999-09-02

    We present a global study of HI spectral line mapping for 16 Hickson Compact Groups (HCGs) combining new and unpublished VLA data, plus the analysis of the HI content of individual galaxies. Sixty percent of the groups show morphological and kinematical signs of perturbations (from multiple tidal features to concentration of the HI in a single enveloping cloud) and sixty five of the resolved galaxies are found to be HI deficient with respect to a sample of isolated galaxies. In total, 77% of the groups suffer interactions among all its members which provides strong evidence of their reality. We find that dynamical evolution does not always produce HI deficiency, but when this deficiency is observed, it appears to correlate with a high group velocity dispersion and in some cases with the presence of a first-ranked elliptical. The X-ray data available for our sample are not sensitive enough for a comparison with the HI mass; however this study does suggest a correlation between HI deficiency and hot gas since velocity dispersions are known from the literature to correlate with X-ray luminosity.

  1. Coral reef microbes : : the influences of benthic primary producers, nutrient availability, and anthropogenic stressors on community structure and metabolism

    E-Print Network [OSTI]

    Kelly, Linda Ellen Wegley

    2013-01-01

    a gradient of nutrient availability. Kelly, L.W. , C.E.for in situ O-2 availability. Marine Ecology-Progressa gradient of nutrient availability. In Preparation. Nelson,

  2. Trace metal mapping by laser-induced breakdown spectroscopy

    SciTech Connect (OSTI)

    Kaiser, Jozef [ORNL; Novotny, Dr. Karel [Masaryk University; Hrdlicka, A [Brno University of Technology, Czech Republic; Malina, R [Brno University of Technology, Czech Republic; Hartl, M [Brno University of Technology, Czech Republic; Kizek, R [Mendel University of Brno; Adam, V [Mendel University of Brno

    2012-01-01

    Abstract: Laser-Induced Breakdown Spectroscopy (LIBS) is a sensitive optical technique capable of fast multi-elemental analysis of solid, gaseous and liquid samples. The potential applications of lasers for spectrochemical analysis were developed shortly after its invention; however the massive development of LIBS is connected with the availability of powerful pulsed laser sources. Since the late 80s of 20th century LIBS dominated the analytical atomic spectroscopy scene and its application are developed continuously. Here we review the utilization of LIBS for trace elements mapping in different matrices. The main emphasis is on trace metal mapping in biological samples.

  3. New Horizons in Gravity: The Trace Anomaly, Dark Energy and Condensate Stars

    E-Print Network [OSTI]

    Mottola, Emil

    2010-01-01

    General Relativity receives quantum corrections relevant at macroscopic distance scales and near event horizons. These arise from the conformal scalar degrees of freedom in the extended effective field theory of gravity generated by the trace anomaly of massless quantum fields in curved space. The origin of these conformal scalar degrees of freedom as massless poles in two-particle intermediate states of anomalous amplitudes in flat space is exposed. At event horizons the conformal anomaly scalar degrees of freedom can have macroscopically large effects on the geometry, potentially removing the classical event horizon of black hole and cosmological spacetimes, replacing them with a quantum boundary layer where the effective value of the gravitational vacuum energy density can change. In the effective theory, the cosmological term becomes a dynamical condensate, whose value depends upon boundary conditions near the horizon. In the conformal phase where the anomaly induced fluctutations dominate, and the conden...

  4. The Effects of Tillage, Cropping and Fertilization on Extractable Soil Nutrients in Four Agro-Ecosystems in Ghana, West Africa 

    E-Print Network [OSTI]

    Davies, Benjamin

    2014-08-10

    and low in fertility due to general overuse, erosion and leaching of nutrients (Breman et al., 2001; Drechsel et al., 2001). In addition, rapid population growth along with inappropriate land use, poor management and lack of nutrient inputs have led... and increased nutrient toxicities due to the increasing intensity of cultivation resulting in soils susceptibility to leaching nutrients along with a high risk of erosion and overall low fertility. Traditional farming practices in Africa are characterized...

  5. Soil organic carbon and nutrient content in aggregate-size fractions of a subtropical rice soil under variable tillage

    E-Print Network [OSTI]

    Florida, University of

    Soil organic carbon and nutrient content in aggregate-size fractions of a subtropical rice soil The effects of tillage on soil organic carbon (SOC) and nutrient content of soil aggregates can vary spatially and temporally, and for different soil types and cropping systems. We assessed SOC and nutrient levels within

  6. Responses of Heterotrophic and Autotrophic Pico- and Nano-Plankton to Nutrient Availability and Enrichment across Marine Systems in the Northern Gulf of Mexico 

    E-Print Network [OSTI]

    Shepard, Alicia Kail

    2015-08-13

    relationships between inorganic nutrients and marine microbial communities. Correlations specifically indicated the importance of temperature, salinity and inorganic nutrients to changes in microbial physiological community structure. Heterotrophic microbes...

  7. Global Change and Mountain Lakes: Establishing Nutrient Criteria and Critical Loads for Sierra Nevada Lakes

    E-Print Network [OSTI]

    Heard, ANDREA Michelle

    2013-01-01

    distribution of characterized fly-ash particles and traceextraction of carbonaceous fly-ash particles from sediments.distribution of characterised fly-ash particles and trace

  8. Automated Tracing of Horizontal Neuron Processes During Retinal Development

    SciTech Connect (OSTI)

    Kerekes, Ryan A [ORNL; Martins, Rodrigo [St. Jude Children's Research Hospital; Dyer, Michael A [ORNL; Gleason, Shaun Scott [ORNL; Karakaya, Mahmut [ORNL; Davis, Denise [St. Jude Children's Research Hospital

    2011-01-01

    In the developing mammalian retina, horizontal neurons undergo a dramatic reorganization oftheir processes shortly after they migrate to their appropriate laminar position. This is an importantprocess because it is now understood that the apical processes are important for establishing theregular mosaic of horizontal cells in the retina and proper reorganization during lamination isrequired for synaptogenesis with photoreceptors and bipolar neurons. However, this process isdifficult to study because the analysis of horizontal neuron anatomy is labor intensive and time-consuming. In this paper, we present a computational method for automatically tracing the three-dimensional (3-D) dendritic structure of horizontal retinal neurons in two-photon laser scanningmicroscope (TPLSM) imagery. Our method is based on 3-D skeletonization and is thus able topreserve the complex structure of the dendritic arbor of these cells. We demonstrate theeffectiveness of our approach by comparing our tracing results against two sets of semi-automatedtraces over a set of 10 horizontal neurons ranging in age from P1 to P5. We observe an averageagreement level of 81% between our automated trace and the manual traces. This automatedmethod will serve as an important starting point for further refinement and optimization.

  9. Reconstructing Critical Paths from Execution Traces Martijn Hendriks

    E-Print Network [OSTI]

    Vaandrager, Frits

    Reconstructing Critical Paths from Execution Traces Martijn Hendriks Embedded Systems Institute of constructing critical paths from incomplete information. In general, a directed acyclic graph of tasks with their execution times (i.e., a task graph) is necessary to extract critical paths. We assume, however, that only

  10. Accurate Critical Path Analysis via Random Trace Construction

    E-Print Network [OSTI]

    Zilles, Craig

    Accurate Critical Path Analysis via Random Trace Construction Pierre Salverda Charles Tucker Craig to their profiled behavior. We demonstrate our technique in the context of critical path analysis, showing it can achieve the same accuracy as a hardware critical path predictor, but with lower hardware requirements. Key

  11. Effect of Microbial Activity on Trace Element Release from Sewage

    E-Print Network [OSTI]

    , and Department of Crop and Soil Sciences, Cornell University, Ithaca, New York 14853 The microbial role performed using thiosulfate as the sole energy source revealed the presence of both known and putative S-effective management alternative. Unfor- tunately, sewage sludge also contains potentially toxic trace elements

  12. Reflected and Transmitted Irradiance from Area Sources using Vertex Tracing

    E-Print Network [OSTI]

    Utah, University of

    Reflected and Transmitted Irradiance from Area Sources using Vertex Tracing Michael M. Stark irradiance analytically from polygonal luminaires in polygonal environments has proven effective for direct- ally used edge-based solutions to the irradiance integral; our previous work pre- sented a vertex

  13. BNL-65897-AB NEW DETECTABILITY IN ATMOSPHERIC PERFLUOROCARBON TRACING

    E-Print Network [OSTI]

    BNL-65897-AB NEW DETECTABILITY IN ATMOSPHERIC PERFLUOROCARBON TRACING Russell N. Dietz, Gunnar I-source releases initially impacted the coast over a 5- to 40-mile extent; the next day, in some cases.S. Department of Energy under Contract No. DE-AC02-98CH10886. #12;

  14. Parallel Seismic Ray Tracing in a Global Earth Model

    E-Print Network [OSTI]

    Genaud, Stéphane

    from the hypocenter (source) to one station. The #28;nal objective of the seismic tomography process1 Parallel Seismic Ray Tracing in a Global Earth Model Marc Grunberg * , Stéphane Genaud of the Earth interior, and seismic tomogra- phy is a means to improve knowledge in this #28;eld. In order

  15. Optimal Suspicion Functions for Tardos Traitor Tracing Schemes

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    Descriptors E.4 [Data]: Coding and Information Theory; G.1 [Mathematics of Computing]: Numerical Analysis; G.1 functions for Tardos traitor tracing schemes. In the simple decoder approach (computation of a score.6 [Numerical Analysis]: Optimization--Constrained optimization, Stochastic programming General Terms Design

  16. LANDFILL UNDERGROUND POLLUTION DETECTION AND CHARACTERIZATION USING INORGANIC TRACES

    E-Print Network [OSTI]

    Short, Daniel

    LANDFILL UNDERGROUND POLLUTION DETECTION AND CHARACTERIZATION USING INORGANIC TRACES M. O. LOOSER1 received 1 January 1998; accepted in revised form 1 January 1999) AbstractÐSince water is the main contamination arrow in the underground, it is necessary to get good indicators to be able to detect pollution

  17. Trace extensions, determinant bundles, and gauge group cocycles

    E-Print Network [OSTI]

    Joakim Arnlind; Jouko Mickelsson

    2002-09-04

    We study the geometry of determinant line bundles associated to Dirac operators on compact odd dimensional manifolds. Physically, these arise as (local) vacuum line bundles in quantum gauge theory. We give a simplified derivation of the commutator anomaly formula using a construction based on noncyclic trace extensions and associated multiplicative renormalized determinants.

  18. Realistic Performance Analysis of WSN Protocols Through Trace Based Simulation

    E-Print Network [OSTI]

    Han, Qi "Chee"

    Realistic Performance Analysis of WSN Protocols Through Trace Based Simulation Alan Marchiori, Lin It is a difficult endeavor to realistically evaluate the perfor- mance of wireless sensor network (WSN) protocols. Generic network simulators are often used, but they tend to rely on synthetic models. Because WSN

  19. TRACE FORMULAS AND BORGTYPE THEOREMS FOR MATRIXVALUED JACOBI AND DIRAC

    E-Print Network [OSTI]

    TRACE FORMULAS AND BORG­TYPE THEOREMS FOR MATRIX­VALUED JACOBI AND DIRAC FINITE DIFFERENCE­valued Jacobi opera­ tors H and supersymmetric Dirac di#erence operators D are proved. More precisely, assuming reflectionless matrix coe#cients A, B in the self­adjoint Jacobi operator H = AS + + A - S - + B (with

  20. Towards understanding heterogeneous clouds at scale: Google trace analysis

    E-Print Network [OSTI]

    , their distribution, and the actual resource utilization. Unlike previous scheduler traces we are aware of, this one comparison of actual resource utilization with the user-supplied resource estimates available to the cluster, Ericsson, Facebook, Fusion-IO, General Electric, Hewlett Packard, Hitachi, Huawei, IBM, Intel, Mark

  1. Trace Partitioning in Abstract Interpretation Based Static Analyzers

    E-Print Network [OSTI]

    Mauborgne, Laurent

    designing a tractable static analysis, one usually needs to approximate the trace semantics. This paper information about the execution order and the concrete flow paths is lost. However, this reachable states or -1 at the end of this piece of code; in par* *ticular sgn cannot be equal to 0. As a consequence

  2. Quantifying the Digital Traces of Hurricane Sandy on Flickr

    E-Print Network [OSTI]

    Stanley, H. Eugene

    Quantifying the Digital Traces of Hurricane Sandy on Flickr Tobias Preis1 *, Helen Susannah Moat1 social science. To investigate user attention to the Hurricane Sandy disaster in 2012, we analyze data to Hurricane Sandy bears a striking correlation to the atmospheric pressure in the US state New Jersey during

  3. Active Layer Soil Carbon and Nutrient Mineralization, Barrow, Alaska, 2012

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

    Stan D. Wullschleger; Holly M. Vander Stel; Colleen Iversen; Victoria L. Sloan; Richard J. Norby; Mallory P. Ladd; Jason K. Keller; Ariane Jong; Joanne Childs; Deanne J. Brice

    2015-10-29

    This data set consists of bulk soil characteristics as well as carbon and nutrient mineralization rates of active layer soils manually collected from the field in August, 2012, frozen, and then thawed and incubated across a range of temperatures in the laboratory for 28 day periods in 2013-2015. The soils were collected from four replicate polygons in each of the four Areas (A, B, C, and D) of Intensive Site 1 at the Next-Generation Ecosystem Experiments (NGEE) Arctic site near Barrow, Alaska. Soil samples were coincident with the established Vegetation Plots that are located in center, edge, and trough microtopography in each polygon. Data included are 1) bulk soil characteristics including carbon, nitrogen, gravimetric water content, bulk density, and pH in 5-cm depth increments and also by soil horizon, 2) carbon, nitrogen, and phosphorus mineralization rates for soil horizons incubated aerobically (and in one case both aerobically and anaerobically) for 28 days at temperatures that included 2, 4, 8, and 12 degrees C. Additional soil and incubation data are forthcoming. They will be available when published as part of another paper that includes additional replicate analyses.

  4. Trace metal levels in sediments of Pearl Harbor (Hawaii)

    SciTech Connect (OSTI)

    Ashwood, T.L.; Olsen, C.R.; Larsen, I.L.; Tamura, T.

    1986-09-01

    This study was conducted to measure the distribution of lead and other trace metals in the sediments of Pearl Harbon (Hawaii) to determine whether paint chips from vessels of the US Navy's Inactive Fleet have affected the environmental quality of Middle Loch. Sediment cores (ranging from 0.5 to 3.0 m long) were collected from Middle Loch near the Naval Inactive Ships Maintenance Facility and in an area of West Loch that is relatively isolated and unaffected by naval operations. Concentrations of copper, lead, and zinc averaged 180 ..mu..g/g, 49 ..mu..g/g, and 272 ..mu..g/g, respectively, in recent Middle Loch sediments. These concentrations are significantly higher than those in either historical Middle Loch sediments or recent West Loch sediments. However, except for lead, the concentrations in recent Middle Loch sediments are similar to those of older Middle Loch sediments, which indicates that the increase in trace metal contamination began before the onset of Inactive Fleet operations (about 1946). Increased trace metal levels in recent Middle Loch sediments might be expected to result from two potential sources: (1) sewage discharges and (2) paint from inactive vessels. Since paint contains elevated levels of lead and zinc but little copper, the elevated copper levels in Middle Loch sediments tend to implicate sewage as the source of trace metal contamination. Moreover, the lead:zinc ratio of recent Middle Loch sediments (0.18:1) is a factor of 10 lower than that measured in paint (2.1:1), and the Middle Loch lead:zinc ratio is not significantly greater than that measured in recent West Loch sediments (0.21:1). Hence, we suggest that sewage rather than paint is the major source of trace metal contamination of Middle Loch. This is consistent with the findings of a previous study by US navy personnel.

  5. Trace Metal Source Terms in Carbon Sequestration Environments

    SciTech Connect (OSTI)

    Karamalidis, Athanasios; Torres, Sharon G.; Hakala, Jacqueline A.; Shao, Hongbo; Cantrell, Kirk J.; Carroll, Susan A.

    2013-01-01

    ABSTRACT: Carbon dioxide sequestration in deep saline and depleted oil geologic formations is feasible and promising; however, possible CO2 or CO2-saturated brine leakage to overlying aquifers may pose environmental and health impacts. The purpose of this study was to experimentally define to provide a range of concentrations that can be used as the trace element source term for reservoirs and leakage pathways in risk simulations. Storage source terms for trace metals are needed to evaluate the impact of brines leaking into overlying drinking water aquifers. The trace metal release was measured from cements and sandstones, shales, carbonates, evaporites, and basalts from the Frio, In Salah, Illinois Basin, Decatur, Lower Tuscaloosa, Weyburn-Midale, Bass Islands, and Grand Ronde carbon sequestration geologic formations. Trace metal dissolution was tracked by measuring solution concentrations over time under conditions (e.g., pressures, temperatures, and initial brine compositions) specific to the sequestration projects. Existing metrics for maximum contaminant levels (MCLs) for drinking water as defined by the U.S. Environmental Protection Agency (U.S. EPA) were used to categorize the relative significance of metal concentration changes in storage environments because of the presence of CO2. Results indicate that Cr and Pb released from sandstone reservoir and shale cap rocks exceed the MCLs byan order of magnitude, while Cd and Cu were at or below drinking water thresholds. In carbonate reservoirs As exceeds the MCLs by an order of magnitude, while Cd, Cu, and Pb were at or below drinking water standards. Results from this study can be used as a reasonable estimate of the trace element source term for reservoirs and leakage pathways in risk simulations to further evaluate the impact of leakage on groundwater quality.

  6. HELSINKI UNIVERSITY OF TECHNOLOGY ENE-47.153 Trace elements and alkaliTrace elements and alkali

    E-Print Network [OSTI]

    Zevenhoven, Ron

    mg/m³STPSTP @ 11 % O22, dry Power plant Finland (1990+) MSW incinerator Finland (1994) MSW incinerator EU * (2000) Power plant Germany (1999) MSW incinerator Germany (1999) Waste incinerator USA (1995 UNIVERSITY OF TECHNOLOGY ENE-47.153 Gas turbine inlet specifications for trace elementsGas turbine inlet

  7. Delone dynamical systems and associated random operators

    E-Print Network [OSTI]

    Daniel Lenz; Peter Stollmann

    2002-05-13

    We carry out a careful study of basic topological and ergodic features of Delone dynamical systems. We then investigate the associated topological groupoids and in particular their representations on certain direct integrals with non constant fibres. Via non-commutative-integration theory these representations give rise to von Neumann algebras of random operators. Features of these algebras and operators are discussed. Restricting our attention to a certain subalgebra of tight binding operators, we then discuss a Shubin trace formula.

  8. Carotenoid In Planta Development, Storage, and Bioaccessibility: A Comprehensive Approach to Nutrient Analysis 

    E-Print Network [OSTI]

    Jeffery, Jennifer L.

    2010-01-14

    Plants contain a host of secondary metabolites that may be of dietary use to man. A comprehensive approach to plant-based nutrition would include investigating all aspects of a nutrient, from creation through storage and consumption. Here...

  9. Interactions between sorption and biodegradation: Exploring bioavailability and pulsed nutrient injection efficiency

    E-Print Network [OSTI]

    bioremediation of contaminated soils. This paper examines the interplay between sorption and bioavailability: Groundwater quality; KEYWORDS: sorption, bioavailability, bioremediation, pulsed injection, efficiency and biodegradation: Exploring bioavailability and pulsed nutrient injection efficiency, Water Resour. Res., 39

  10. Regulation of mTOR complex 1 in response to growth factors and nutrients

    E-Print Network [OSTI]

    Sancak, Yasemin S. (Yasemin Shechner)

    2010-01-01

    In multicellular organisms, cells ensure the simultaneous availability of growth factors and nutrients before they invest in cellular processes that lead to growth. The TOR kinase is a master regulator of cellular growth ...

  11. Regulation of the mTOR Complex 1 Pathway by Nutrients, Growth Factors, and Stress

    E-Print Network [OSTI]

    Sengupta, Shomit

    The large serine/threonine protein kinase mTOR regulates cellular and organismal homeostasis by coordinating anabolic and catabolic processes with nutrient, energy, and oxygen availability and growth factor signaling. Cells ...

  12. Effects of light and nutrients on seasonal phytoplankton succession in a temperate eutrophic coastal lagoon

    E-Print Network [OSTI]

    Drake, Jeana L.; Carpenter, Edward J.; Cousins, Mary; Nelson, Kara L.; Guido-Zarate, Alejandro; Loftin, Keith

    2010-01-01

    between pho- tosynthesis and light for natural assemblagesRESEARCH PAPER Effects of light and nutrients on seasonalkW m -2 d -1 ), water column light attenuation (max = 14 m -

  13. The Beef Nutrient Database Improvement Project: Retail Cuts From the Rib and Plate 

    E-Print Network [OSTI]

    May, Laura

    2011-02-22

    The purpose of this study was to collect and analyze retail cuts from the beef rib and plate that had been identified as needing nutrient composition updates in the United States Department of Agriculture’s (USDA) National ...

  14. A Geographical Approach to Tracking Escherichia coli and Nutrients in a Texas Coastal Plains Watershed 

    E-Print Network [OSTI]

    Harclerode, Cara

    2011-02-22

    Carters Creek in Brazos County, Texas, like many surface water reaches in the Texas Gulf Coast region, has been identified for bacteria and nutrient impairment on the Texas Commission on Environmental Quality (TCEQ) 303(d) ...

  15. Obfuscatory obscanturism: making workload traces of commercially-sensitive systems safe to release

    E-Print Network [OSTI]

    Cortes, Corinna

    such as traces, researchers must make assumptions, but these may be at odds with the actual workloads. For example, traces from Hadoop MapReduce analytics clusters at Facebook and Yahoo showed that small jobs

  16. Direct Painting Software for Tracing on 3D Brain Surfaces with

    E-Print Network [OSTI]

    Direct Painting Software for Tracing on 3D Brain Surfaces with Global Conformal Parameterization 1 4 Illustrates tracing on the brain surface with the direct painting software. (a) shows the global

  17. Combining sedimentological, trace metal (Mn, Mo) and molecular evidence for reconstructing past water-column

    E-Print Network [OSTI]

    Gilli, Adrian

    Combining sedimentological, trace metal (Mn, Mo) and molecular evidence for reconstructing past online 22 June 2013 Abstract Here, we present sedimentological, trace metal, and molecular evidence underscores the value of combining sedimentological, geochemical, and microbiological approaches

  18. Sandia Energy - Scattering Dynamics

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

    Scattering Dynamics Home Transportation Energy Predictive Simulation of Engines Combustion Chemistry Chemical Dynamics Scattering Dynamics Scattering DynamicsAshley...

  19. Trace Formula in Noncommutative Geometry and the Zeros of the Riemann Zeta Function

    E-Print Network [OSTI]

    Connes, Alain

    Trace Formula in Noncommutative Geometry and the Zeros of the Riemann Zeta Function Alain CONNES interpretation of the explicit formulas of number theory as a trace formula on the noncommutative space of Adele classes. This reduces the Riemann hypothesis to the validity of the trace formula and eliminates

  20. A RELATIVE TRACE FORMULA FOR A COMPACT RIEMANN KIMBALL MARTIN, MARK MCKEE, AND ERIC WAMBACH

    E-Print Network [OSTI]

    Martin, Kimball

    A RELATIVE TRACE FORMULA FOR A COMPACT RIEMANN SURFACE KIMBALL MARTIN, MARK MCKEE, AND ERIC WAMBACH Abstract. We study a relative trace formula for a compact Riemann surface with respect to a closed geodesic estimates on the lengths of geodesic segments which start and end orthogonally on C. Variant trace formulas

  1. RAY TRACING IN THE SMOOTHED ACOUSTIC SEG/EAGE SALT MODEL.

    E-Print Network [OSTI]

    Cerveny, Vlastislav

    RAY TRACING IN THE SMOOTHED ACOUSTIC SEG/EAGE SALT MODEL. PART 1: SEISMOGRAMS V â?? ACLAV BUCHA­waves in the smoothed acoustic SEG/EAGE Salt Model are computed. The shot­receiver configuration is derived from that the smoothed SEG/EAGE Salt Model is suitable for two­point ray tracing. KEY WORDS Velocity model, ray tracing

  2. The effects of shifting modality between study and test: a fuzzy-trace theory analysis 

    E-Print Network [OSTI]

    Gerkens, David Preston

    2001-01-01

    The present research was designed to test properties of the fuzzy-trace theory memory model. Fuzzy-trace theory is a global memory model that posits that multiple memory traces are formed for every experience. According to the theory there are two...

  3. From GPS Traces to a Routable Road Map Department of Computer Science

    E-Print Network [OSTI]

    Krumm, John

    pulls together traces that belong on the same road in response to simulated potential energy wellsFrom GPS Traces to a Routable Road Map Lili Cao Department of Computer Science University presents a method for automatically converting raw GPS traces from everyday vehicles into a routable road

  4. Trace element patterns in lichens following uranium mine closures

    SciTech Connect (OSTI)

    Fahselt, D.; Wu, T.W.; Mott, B. [Univ. of Western Ontario, London (Canada)

    1995-09-01

    Instrumental neutron activation analysis was used to determine trace elements in Cladina mitis (Sandst). Hale & Culb. along transects extending from uranium mines at Elliot Lake and Agnew Lake in central Ontario, Canada. Levels of 11 elements were reported and the presence of uranium (U) was confirmed, although U concentrations were much less than in Cladina rangiferina 10 years earlier. Among the elements identified in lichen thalli was Th, which occurred in higher concentrations than U. All trace elements, including the two radionuclides, were found in deteriorating thallus parts as well as living podetia, and five of these seem to have originated as airborne particulates from minesites. In spite of mine closures, levels of Th and U remained higher near sources of ore dust and there was little relationship between radionuclide concentrations in thallus and substrate. 24 refs., 4 figs., 3 tabs.

  5. Ray tracing a three dimensional scene using a grid

    DOE Patents [OSTI]

    Wald, Ingo; Ize, Santiago; Parker, Steven G; Knoll, Aaron

    2013-02-26

    Ray tracing a three-dimensional scene using a grid. One example embodiment is a method for ray tracing a three-dimensional scene using a grid. In this example method, the three-dimensional scene is made up of objects that are spatially partitioned into a plurality of cells that make up the grid. The method includes a first act of computing a bounding frustum of a packet of rays, and a second act of traversing the grid slice by slice along a major traversal axis. Each slice traversal includes a first act of determining one or more cells in the slice that are overlapped by the frustum and a second act of testing the rays in the packet for intersection with any objects at least partially bounded by the one or more cells overlapped by the frustum.

  6. Fast stereoscopic images with ray-traced volume rendering

    SciTech Connect (OSTI)

    Adelson, S.J.; Hansen, C.D.

    1994-05-01

    One of the drawbacks of standard volume rendering techniques is that is it often difficult to comprehend the three-dimensional structure of the volume from a single frame; this is especially true in cases where there is no solid surface. Generally, several frames must be generated and viewed sequentially, using motion parallax to relay depth. Another option is to generate a single spectroscopic pair, resulting in clear and unambiguous depth information in both static and moving images. Methods have been developed which take advantage of the coherence between the two halves of a stereo pair for polygon rendering and ray-tracing, generating the second half of the pair in significantly less time than that required to completely render a single image. This paper reports the results of implementing these techniques with parallel ray-traced volume rendering. In tests with different data types, the time savings is in the range of 70--80%.

  7. Physiological, ecological, and evolutionary studies of trace metal homeostasis in marine microbes

    E-Print Network [OSTI]

    Dupont, Christopher Lee

    2008-01-01

    homeostasis in marine microbes A dissertation submitted inhomeostasis in marine microbes by Christopher Lee Dupontbiomass by heterotrophic microbes at depth. The nutrient-

  8. Stress Tensors from Trace Anomalies in Conformal Field Theories

    E-Print Network [OSTI]

    Christopher P. Herzog; Kuo-Wei Huang

    2013-04-08

    Using trace anomalies, we determine the vacuum stress tensors of arbitrary even dimensional conformal field theories in Weyl flat backgrounds. We demonstrate a simple relation between the Casimir energy on the real line times a sphere and the type A anomaly coefficient. This relation generalizes earlier results in two and four dimensions. These field theory results for the Casimir are shown to be consistent with holographic predictions in two, four, and six dimensions.

  9. Lyapunov exponents for 2D ray tracing without interfaces

    E-Print Network [OSTI]

    Cerveny, Vlastislav

    Lyapunov exponents for 2­D ray tracing without interfaces LudŸek KlimeŸs Department of Geophysics@seis.karlov.mff.cuni.cz Summary The Lyapunov exponents asymptotically quantify the exponential divergence of rays. The ``Lyapunov exponent'' for a finite 2­D ray and the average ``Lyapunov exponents'' for a set of finite 2­D rays

  10. Trace elements in coal by glow discharge mass spectrometry

    SciTech Connect (OSTI)

    Jacobs, M.L.; Wilson, C.R.; Pestovich, J. Jr.

    1995-08-01

    A need and a demand exist for determining trace elements in coal and coal related by-products, especially those elements which may potentially be a health hazard. The provisions of the 1990 clean air act require that the EPA evaluate the emissions of electric utilities for trace elements and other potentially hazardous organic compounds. The coal fired electric utility industry supplies roughly 60% of the total generating capacity of 2,882,525 million kilowatt hours (nearly 3 trillion kilowatt hours) generated in the U.S. This is accomplished by 414 power plants scattered across the country that burned 813,508,000 short tons of coal in 1993. The relative volatility of some inorganic constituents in coal makes them more prone to be emitted to the atmosphere following combustion. The production of analytical data for trace elements is known to be a difficult task in coal and by-products of coal combustion (fly ash, bottom ash, gas streams, etc.), in terms of both sample collection and analytical determinations. There are several common analytical methods available to the analyst to determine trace elements in coal and coal by-products. In general analytical germs, the material to be analyzed can be totally solubilized (or extracted), or the elements analytes can be determined in the material as a solid. A relatively new elemental technique, Glow Discharge Mass Spectrometry (GDMS) can be used with solids as well. This new analytical technique had never before been applied directly to coal. The radio frequency-glow discharge quadropole mass spectrometer was used to analyze coal directly for the first time ever by rf-GDMS. The rf-GDMS technique is described.

  11. Trace Metal Source Terms in Carbon Sequestration Environments

    SciTech Connect (OSTI)

    Karamalidis, Athanasios K.; Torres, Sharon G.; Hakala, J. Alexandra; Shao, Hongbo; Cantrell, Kirk J.; Carroll, Susan

    2013-01-01

    Carbon dioxide sequestration in deep saline and depleted oil geologic formations is feasible and promising, however, possible CO{sub 2} or CO{sub 2}-saturated brine leakage to overlying aquifers may pose environmental and health impacts. The purpose of this study was to experimentally define trace metal source terms from the reaction of supercritical CO{sub 2}, storage reservoir brines, reservoir and cap rocks. Storage reservoir source terms for trace metals are needed to evaluate the impact of brines leaking into overlying drinking water aquifers. The trace metal release was measured from sandstones, shales, carbonates, evaporites, basalts and cements from the Frio, In Salah, Illinois Basin – Decatur, Lower Tuscaloosa, Weyburn-Midale, Bass Islands and Grand Ronde carbon sequestration geologic formations. Trace metal dissolution is tracked by measuring solution concentrations over time under conditions (e.g. pressures, temperatures, and initial brine compositions) specific to the sequestration projects. Existing metrics for Maximum Contaminant Levels (MCLs) for drinking water as defined by the U.S. Environmental Protection Agency (U.S. EPA) were used to categorize the relative significance of metal concentration changes in storage environments due to the presence of CO{sub 2}. Results indicate that Cr and Pb released from sandstone reservoir and shale cap rock exceed the MCLs by an order of magnitude while Cd and Cu were at or below drinking water thresholds. In carbonate reservoirs As exceeds the MCLs by an order of magnitude, while Cd, Cu, and Pb were at or below drinking water standards. Results from this study can be used as a reasonable estimate of the reservoir and caprock source term to further evaluate the impact of leakage on groundwater quality.

  12. Dairy Analytics and Nutrient Analysis (DANA) Prototype System User Manual

    SciTech Connect (OSTI)

    Sam Alessi; Dennis Keiser

    2012-10-01

    This document is a user manual for the Dairy Analytics and Nutrient Analysis (DANA) model. DANA provides an analysis of dairy anaerobic digestion technology and allows users to calculate biogas production, co-product valuation, capital costs, expenses, revenue and financial metrics, for user customizable scenarios, dairy and digester types. The model provides results for three anaerobic digester types; Covered Lagoons, Modified Plug Flow, and Complete Mix, and three main energy production technologies; electricity generation, renewable natural gas generation, and compressed natural gas generation. Additional options include different dairy types, bedding types, backend treatment type as well as numerous production, and economic parameters. DANA’s goal is to extend the National Market Value of Anaerobic Digester Products analysis (informa economics, 2012; Innovation Center, 2011) to include a greater and more flexible set of regional digester scenarios and to provide a modular framework for creation of a tool to support farmer and investor needs. Users can set up scenarios from combinations of existing parameters or add new parameters, run the model and view a variety of reports, charts and tables that are automatically produced and delivered over the web interface. DANA is based in the INL’s analysis architecture entitled Generalized Environment for Modeling Systems (GEMS) , which offers extensive collaboration, analysis, and integration opportunities and greatly speeds the ability construct highly scalable web delivered user-oriented decision tools. DANA’s approach uses server-based data processing and web-based user interfaces, rather a client-based spreadsheet approach. This offers a number of benefits over the client-based approach. Server processing and storage can scale up to handle a very large number of scenarios, so that analysis of county, even field level, across the whole U.S., can be performed. Server based databases allow dairy and digester parameters be held and managed in a single managed data repository, while allows users to customize standard values and perform individual analysis. Server-based calculations can be easily extended, versions and upgrades managed, and any changes are immediately available to all users. This user manual describes how to use and/or modify input database tables, run DANA, view and modify reports.

  13. A Fluid Dynamics Approach to Multi-Robot Chemical Plume Tracing Dimitri Zarzhitsky

    E-Print Network [OSTI]

    computational fluid dy- namics (CFD) grid for calculating derivatives of flow-field variables, such as wind the conservation of mass, New- ton's Second Law, and conservation of energy [1]. For real- istic flows of interest. Our algorithm takes advantage of the lattice formations formed by our robotic agents to simulate

  14. An Individualized Web-based Algebra Tutor Based on Dynamic Deep Model Tracing

    E-Print Network [OSTI]

    Refanidis, Ioannis

    and Ioannis Refanidis1 1 University of Macedonia, Department of Applied Informatics, Egnatia 156, P.O. Box

  15. Temporal variability in chemical cycling of the subterranean estuary and associated chemical loading to the coastal ocean

    E-Print Network [OSTI]

    Gonneea, Meagan Joan Eagle

    2014-01-01

    At the land-ocean interface, terrestrial groundwater interacts with seawater to form a subterranean estuary, which can play host to dynamic biogeochemical cycling of nutrients, trace metals and radionuclides. This chemically ...

  16. Stream ecological processes are modeled through a simple predator-prey model, which reproduces benthic algae and macro-invertebrates dynamics.

    E-Print Network [OSTI]

    reproduces benthic algae and macro-invertebrates dynamics. Algae biomass = growth - death loss - predation influences on algae and macro-invertebrates dynamics will be introduced in the predator-prey model: - at increasing flow velocity high nutrient availability, algae erosion and macro-invertebrate drag

  17. Design and application of a mobile ground-based observatory for continuous measurements of atmospheric trace gas and criteria pollutant species

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

    Bush, S. E.; Hopkins, F. M.; Randerson, J. T.; Lai, C.-T.; Ehleringer, J. R.

    2015-08-26

    Ground-based measurements of atmospheric trace gas species and criteria pollutants are essential for understanding emissions dynamics across space and time. Gas composition in the lower 50 m of the atmosphere has the greatest direct impacts on human health as well as ecosystem processes; hence data at this level are necessary for addressing carbon-cycle- and public-health-related questions. However, such surface data are generally associated with stationary measurement towers, where spatial representation is limited due to the high cost of establishing and maintaining an extensive network of measurement stations. We describe here a compact mobile laboratory equipped to provide high-precision, high-frequency, continuous,more »on-road synchronous measurements of CO2, CO, CH4, H2O, NOx, O3, aerosol, meteorological, and geospatial position data. The mobile laboratory has been deployed across the western USA. In addition to describing the vehicle and its capacity, we present data that illustrate the use of the laboratory as a powerful tool for investigating the spatial structure of urban trace gas emissions and criteria pollutants at spatial scales ranging from single streets to whole ecosystem and regional scales. We assess the magnitude of known point sources of CH4 and also identify fugitive urban CH4 emissions. We illustrate how such a mobile laboratory can be used to better understand emissions dynamics and quantify emissions ratios associated with trace gas emissions from wildfire incidents. Lastly, we discuss additional mobile laboratory applications in health and urban metabolism.« less

  18. Design and application of a mobile ground-based observatory for continuous measurements of atmospheric trace-gas and criteria pollutant species

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

    Bush, S. E.; Hopkins, F. M.; Randerson, J. T.; Lai, C.-T.; Ehleringer, J. R.

    2015-01-06

    Ground-based measurements of atmospheric trace gas species and criteria pollutants are essential for understanding emissions dynamics across space and time. Gas composition in the surface 50 m has the greatest direct impacts on human health as well as ecosystem processes, hence data at this level is necessary for addressing carbon cycle and public health related questions. However, such surface data are generally associated with stationary measurement towers, where spatial representation is limited due to the high cost of establishing and maintaining an extensive network of measurement stations. We describe here a compact mobile laboratory equipped to provide high-precision, high-frequency, continuous,more »on-road synchronous measurements of CO2, CO, CH4, H2O, NOx, O3, aerosol, meteorological, and geospatial position data. The mobile laboratory has been deployed across the western USA. In addition to describing the vehicle and its capacity, we present data that illustrate the use of the laboratory as a powerful tool for investigating the spatial structure of urban trace gas emissions and criteria pollutants at spatial scales ranging from single streets to whole ecosystem and regional scales. We identify fugitive urban CH4 emissions and assess the magnitude of CH4 emissions from known point sources. We illustrate how such a mobile laboratory can be used to better understand emissions dynamics and quantify emissions ratios associated with trace gas emissions from wildfire incidents. Lastly, we discuss additional mobile laboratory applications in health and urban metabolism.« less

  19. Natchez Trace Elec Power Assn | Open Energy Information

    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:QAsource History ViewMayo, Maryland:NPI Ventures Ltd Jump to: navigation,Naples, Maine:New York: EnergyNatchez Trace

  20. Trace-element zoning in garnets from sheared mantle xenoliths

    SciTech Connect (OSTI)

    Griffin, W.L.; Cousens, D.R.; Ryan, C.G.; Sie, S.H.; Suter, G.F. ); Smith, D. ); Boyd, F.R. )

    1989-02-01

    Proton-microprobe analyses of garnets from sheared high-temperature ultramafic xenoliths reveal marked zonation of trace elements, paralleling trends in major and minor elements. Garnet rims (600-1,000 {mu}m wide) are enriched in Fe, Ti, Zr, Y and Ga, and either enriched or depleted in Cr, relative to cores. Zoning profiles for Ti and Zr are S-shaped and extend further into the grains than the Cr and Ga gradients. The profiles are consistent with the formation of Ti, Zr, Y-enriched garnet overgrowths, followed by diffusive equilibration between rim and core over years to hundreds of years. This enrichment in Fe, Ca, Al and incompatible elements is ascribed to melt infiltration and consequent melt-crystal exchange and garnet growth, shortly before eruption. Zr/Y is 1 to 2 in garnet cores but 4 to 5 in rims, and so the infiltrating melt may have been relatively alkalic. Major and trace element concentrations in such high-temperature sheared xenoliths are not likely to resemble those of primitive mantle or of residual mantle depleted by melt extraction.

  1. The trace on the K-theory of group C Thomas Schick

    E-Print Network [OSTI]

    The trace on the K-theory of group C -algebras Thomas Schick FB Mathematik -- Uni M to be countable. The trace trG : CG C : gG gg 1 (where e-mail: thomas.schick@math.uni-muenster.de www: http #12;2 Thomas Schick 1 is the neutral element of G) extends to a trace on the reduced C-algebra of G

  2. Homogeneous and Heterogeneous Reaction and Transformation of Hg and Trace Metals in Combustion Systems

    SciTech Connect (OSTI)

    J. Helble; Clara Smith; David Miller

    2009-08-31

    The overall goal of this project was to produce a working dynamic model to predict the transformation and partitioning of trace metals resulting from combustion of a broad range of fuels. The information provided from this model will be instrumental in efforts to identify fuels and conditions that can be varied to reduce metal emissions. Through the course of this project, it was determined that mercury (Hg) and arsenic (As) would be the focus of the experimental investigation. Experiments were therefore conducted to examine homogeneous and heterogeneous mercury oxidation pathways, and to assess potential interactions between arsenic and calcium. As described in this report, results indicated that the role of SO{sub 2} on Hg oxidation was complex and depended upon overall gas phase chemistry, that iron oxide (hematite) particles contributed directly to heterogeneous Hg oxidation, and that As-Ca interactions occurred through both gas-solid and within-char reaction pathways. Modeling based on this study indicated that, depending upon coal type and fly ash particle size, vaporization-condensation, vaporization-surface reaction, and As-CaO in-char reaction all play a role in arsenic transformations under combustion conditions.

  3. TRACING THE CONTAMINANT HISTORY OF AN URBAN WATERSHED THROUGH AN EXAMINATION OF AQUATIC

    E-Print Network [OSTI]

    TRACING THE CONTAMINANT HISTORY OF AN URBAN WATERSHED THROUGH AN EXAMINATION OF AQUATIC SEDIMENTS DOE FRAP 1998-24 Prepared for: Environment Canada Environmental Conservation Branch Aquatic

  4. High Precision Load Current Sensing using On-Line Calibration of Trace Resistance

    E-Print Network [OSTI]

    Sanders, Seth

    . The voltage drop across a trace resistance at the output * cortr In is wh eletr l to the output is amplified

  5. PUBLISHED ONLINE: 6 APRIL 2014 | DOI: 10.1038/NCLIMATE2177 Nutrient availability as the key regulator of global

    E-Print Network [OSTI]

    Malhi, Yadvinder

    in net ecosystem production (NEP) on a global scale are, however, poorly known. As increasing nutrient role in determining NEP and ecosystem carbon-use e ciency (CUEe; that is, the ratio of NEP to gross primary production (GPP)). Forests with high GPP exhibited high NEP only in nutrient-rich forests (CUEe

  6. WATER QUALITY EFFECTS OF ABOVE-STREAM FISH FEEDERS IN LOW-NUTRIENT NORTH CAROLINA MOUNTAIN STREAMS

    E-Print Network [OSTI]

    Buckel, Jeffrey A.

    WATER QUALITY EFFECTS OF ABOVE-STREAM FISH FEEDERS IN LOW- NUTRIENT NORTH CAROLINA MOUNTAIN STREAMS EFFECTS OF ABOVE-STREAM FISH FEEDERS IN LOW- NUTRIENT NORTH CAROLINA MOUNTAIN STREAMS James F. Gilliam and Thomas A. Cady Department of Zoology College of Agriculture and Life Sciences North Carolina State

  7. PUBLISHED ONLINE: 6 APRIL 2014 | DOI: 10.1038/NCLIMATE2177 Nutrient availability as the key regulator of global

    E-Print Network [OSTI]

    LETTERS PUBLISHED ONLINE: 6 APRIL 2014 | DOI: 10.1038/NCLIMATE2177 Nutrient availability as the key availability increases the production of biomass per unit of photosynthesis2 and reduces heterotrophic3 study of 92 forests in di erent climate zones revealed that nutrient availability indeed plays a crucial

  8. Weakness in the band: nutrient-mediated trade-offs between migration and immunity of Mormon crickets, Anabrus simplex

    E-Print Network [OSTI]

    Lorch, Patrick D.

    Weakness in the band: nutrient-mediated trade-offs between migration and immunity of Mormon encapsulation life history lysozyme nutrition phenoloxidase Mormon crickets, Anabrus simplex, form large in Mormon cricket bands because of nutrient limitations. Members of a migratory band in Nevada, U

  9. CONTROL OF TRACE METAL EMISSIONS DURING COAL COMBUSTION

    SciTech Connect (OSTI)

    THOMAS C. HO

    1998-02-18

    Emissions of toxic trace metals in the form of metal fumes or submicron particulates from a coal-fired combustion source have received greater environmental and regulatory concern over the past years. Current practice of controlling these emissions is to collect them at the cold-end of the process by air-pollution control devices (APCDs) such as electrostatic precipitators and baghouses. However, trace metal fumes may not always be effectively collected by these devices because the formed fumes are extremely small. The proposed research is to explore the opportunities for improved control of toxic trace metal emissions, alternatively, at the hot-end of the coal combustion process, i.e., in the combustion chamber. The technology proposed is to prevent the metal fumes from forming during the process, which would effectively eliminate the metal emission problems. Specifically, the technology is to employ suitable sorbents to (1) reduce the amount of metal volatilization during combustion and (2) capture volatilized metal vapors. The objectives of the project are to demonstrate the technology and to characterize the metal capture process during coal combustion in a fluidized bed combustor. This final technical report details the work performed, the conclusions obtained, and the accomplishments achieved over the project performance period from July 1, 1994 through December 31, 1997. Specifically, this report consists of the following five chapters: Chapter 1. Executive Summary; Chapter 2. Metal Capture by Various Sorbents; Chapter 3. Simultaneous Metal and Sulfur Capture; Chapter 4. Sorption and Desorption of Mercury on Sorbents; and Chapter 5. Project Conclusions. In summary, the metals involved in the project were arsenic, cadmium, chromium, lead, mercury and selenium and the sorbents tested included bauxite, zeolite and calcined limestone. The three sorbents have been found to have various degree of metal capture capability on arsenic, cadmium, chromium and lead. Among them, calcined limestone is capable of simultaneouely capturing metals and sulfur. Mercury and selenium, however, can not be effectively retained by these sorbents under the combustion conditions. Mercury adsorption by sorbents at low temperatures was also investigated and the developed mass transfer model for mercury absorption appears to describe reasonably well the experimental results. Overall, the project has generated 18 presentations and/or publications in professional conferences and journals.

  10. The light : nutrient ratio in lakes: a test of hypothesized trends in bacterial

    E-Print Network [OSTI]

    Chrzanowski, Thomas H.

    -nutrient environment, bacteria would be driven towards carbon (C) limitation. We assessed the growth limitation of bacteria in two reservoirs of the southern U.S.A. using a mortality-corrected dilution-growth approach. We the elemental composition of autotrophs [the carbon : phosphorus (C : P) ratio], with attendant conse- quences

  11. Vincent Salters Research Projects Speciation of Metals and Nutrients in Natural Waters

    E-Print Network [OSTI]

    Weston, Ken

    nutrients or heavy metals is first manifested at the lowest levels in the food web, i.e. in the bacteria before dramatic changes occur. In addition, treatment ponds and wetlands can be engineered more (Vervoort et al., 2000; Vervoort et al., 1999). We will test this excellent correlation between Nd and Hf

  12. Nutrient-sensitized screening for drugs that shift energy metabolism from mitochondrial

    E-Print Network [OSTI]

    Beimel, Amos

    Nutrient-sensitized screening for drugs that shift energy metabolism from mitochondrial respiration energy metabolism. (a) Fibroblasts grown on glucose- or galactose-containing media are exposed and concomitant increase in ECAR in all cell types tested, including immortalized mouse striatal cells, human

  13. Nutrient Interactions and Toxicity The Amino Bisphosphonate Ibandronate Prevents Vitamin D Toxicity and

    E-Print Network [OSTI]

    Price, Paul A.

    Nutrient Interactions and Toxicity The Amino Bisphosphonate Ibandronate Prevents Vitamin D Toxicity and Inhibits Vitamin D-Induced Calcification of Arteries, Cartilage, Lungs and Kidneys in Rats1 Paul A. Price,2 treated with a toxic dose of vitamin D. These studies were prompted by the recent discovery

  14. Water Masses and Nutrient Sources to the Gulf of Maine5 David W. Townsend1

    E-Print Network [OSTI]

    Townsend, David W.

    1 2 3 4 Water Masses and Nutrient Sources to the Gulf of Maine5 6 7 8 9 10 11 David W Research33 34 35 36 37 38 39 1 / School of Marine Sciences, University of Maine, Orono, ME 04469;2 47 ABSTRACT48 49 The Gulf of Maine, a semi-enclosed basin on the continental shelf

  15. What Are Nutrient-Dense Fish Feeds and Their Importance in Aquaculture?1

    E-Print Network [OSTI]

    Hill, Jeffrey E.

    ; water, carbohydrates, lipids, proteins, minerals, and vitamins. Animals derive energy from three of these nutrients: lipids, proteins, and carbohydrates (the chemical energy or heat density available for the animal visit the EDIS website at http://edis.ifas.ufl.edu. 2. Richard D. Miles, professor, Animal Sciences

  16. Nutrient Loading and System Response in the Coastal Lagoons of the Delmarva Presented to

    E-Print Network [OSTI]

    Lawrence, Deborah

    Nutrient Loading and System Response in the Coastal Lagoons of the Delmarva Peninsula Approved by the Committee, April 2009 Committee Co-Chair/Co-Advisor Mark J. Brush, PhD. Committee Co-Chair/Co-Advisor a combination of watershed modeling and nitrogen source tracking

  17. Fog and Soil Weathering as Sources of Nutrients in a California Redwood Forest

    E-Print Network [OSTI]

    265 Fog and Soil Weathering as Sources of Nutrients in a California Redwood Forest Holly A. Ewing,1. Firestone,4 and Vanessa K.S. Boukili5 Abstract Fog water deposition is thought to influence the ecological from fog and rain, as well as the fate of these inputs, within a Sonoma County, California, coast

  18. Chapter 5 -Sediment, Nutrient, and Vegetation Trends Along the Tidal, Forested Pocomoke

    E-Print Network [OSTI]

    Chapter 5 - Sediment, Nutrient, and Vegetation Trends Along the Tidal, Forested Pocomoke River-tidal upstream sites. Floodplain sediments in the past W.H. Conner, T.W. Doyle, and K.W. Krauss (eds.), Ecology]). These sediments overlie hundreds of meters of Tertiary (2-65 mybp) greensands and clay- silt. The Tertiary

  19. A stream's role in watershed nutrient export Robert O. Hall, Jr.*

    E-Print Network [OSTI]

    Hall Jr., Robert O.

    A stream's role in watershed nutrient export Robert O. Hall, Jr.* Department of Zoology of research is that element export can dramatically increase after forest removal; e.g., ni- trate of the water- shed, and any modifications to element export by the stream itself are minimal relative

  20. Export of nutrients from the Arctic Ocean Sinhu Torres-Valds,1

    E-Print Network [OSTI]

    Naveira Garabato, Alberto

    Export of nutrients from the Arctic Ocean Sinhué Torres-Valdés,1 Takamasa Tsubouchi,2 Sheldon Bacon Strait, the Barents Sea Opening (BSO), and Bering Strait. We found that the major exports of all three budgets show that statistically robust net silicate and phosphate exports exist, while the net nitrate

  1. Body composition and nutrient metabolism in juvenile athletic horses treated with exogenous equine somatotropin 

    E-Print Network [OSTI]

    Sutfin, Jonathan Arthur

    2000-01-01

    . They were fed a balanced diet that met or exceeded NRC (1989) nutrient requirements for long-yearlings in training. Treatment with eST elevated plasma IGF-I concentrations by d 14 of treatment, which remained elevated until the end of the treatment period...

  2. The Brazil Eucalyptus Potential Productivity Project: Influence of water, nutrients and stand uniformity on wood production

    E-Print Network [OSTI]

    Anderson, Charles W.

    The Brazil Eucalyptus Potential Productivity Project: Influence of water, nutrients and stand, Brazil f Veracel Celulose, Eunapolis, Bahia, Brazil g International Paper do Brasil, Mogi Guacu, Sao Paulo, Brazil h Suzano Papel e Celulose, Teixeira de Freitas, Bahia, Brazil i CENIBRA, Ipatinga, Minas

  3. MICHIGAN'S SOIL NITRATE TEST FOR CORN MSU SOIL AND PLANT NUTRIENT LAB

    E-Print Network [OSTI]

    Isaacs, Rufus

    MICHIGAN'S SOIL NITRATE TEST FOR CORN MSU SOIL AND PLANT NUTRIENT LAB Michigan State University Extension Crop and Soil Sciences Department Michigan State University WHY TEST SOIL FOR NITRATES Nitrate testing of soil is an excellent and inexpensive way of evaluating the available nitrogen (N) status

  4. Soil Biology & Biochemistry 39 (2007) 21382149 Heterogeneity of soil nutrients and subsurface biota

    E-Print Network [OSTI]

    Neher, Deborah A.

    2007-01-01

    Author's personal copy Soil Biology & Biochemistry 39 (2007) 2138­2149 Heterogeneity of soil Laboratory, 999-W, Aiken, SC 29808, USA f Department of Plant & Soil Science, University of Vermont, Hills to have a highly heterogeneous distribution of nutrients and soil biota, with greater concentrations

  5. Nutrient Removal in a Cold-Region Wastewater Stabilization Pond: Importance of Ammonia Volatilization

    E-Print Network [OSTI]

    Rockne, Karl J.

    Nutrient Removal in a Cold-Region Wastewater Stabilization Pond: Importance of Ammonia through a three pond wastewater stabilization system WWSP was measured over the course of a year in a cold%, with most of the removal occurring in the primary pond. Algal carbon requirements were met by a combination

  6. Production and carbon allocation in a clonal Eucalyptus plantation with water and nutrient manipulations

    E-Print Network [OSTI]

    Anderson, Charles W.

    Production and carbon allocation in a clonal Eucalyptus plantation with water and nutrient on growth and carbon allocation in a fast-growing, clonal plantation of Eucalyptus grandis  urophylla, indicated a strong response of these Eucalyptus trees to both water supply and atmospheric humidity during

  7. TECHNICAL REPORTS Nutrient leaching in highly weathered tropical soils often poses

    E-Print Network [OSTI]

    Lehmann, Johannes

    for crop production. We investigated the effects of applying 20 t ha-1 biochar (BC) to a Colombian savanna additions were about one order of magnitude lower than at other depths, except for P. Biochar applications. Nutrient Leaching in a Colombian Savanna Oxisol Amended with Biochar Julie Major, Marco Rondon, Diego

  8. Rapid nutrient load reduction during infiltration of managed aquifer recharge in an agricultural groundwater basin

    E-Print Network [OSTI]

    Fisher, Andrew

    Rapid nutrient load reduction during infiltration of managed aquifer recharge in an agricultural% to 60% of the nitrate load being removed over the first 6 weeks of managed aquifer recharge operation Management Agency, Watsonville, CA, USA Abstract: Artificial recharge of groundwater is an increasingly

  9. The Beef Nutrient Database Improvement Study: Retail Cuts from the Loin and Round 

    E-Print Network [OSTI]

    Grimes, Haley

    2012-07-16

    of the Nutrient Database Improvement Project. A total of 20 carcasses were selected from three packing plants across the United States, and round and loin subprimals from these carcasses were collected and transported to Texas A&M University. These subprimals were...

  10. Industrialized Animal Production--A Major Source of Nutrient and Microbial Pollution

    E-Print Network [OSTI]

    Mallin, Michael

    and regionally. Individual concentrated animal feeding operations (CAFOs) now house hundreds to thousandsIndustrialized Animal Production--A Major Source of Nutrient and Microbial Pollution to Aquatic, and cattle are raised and fed in concen- trated animal feeding operations (CAFOs) owned by large, vertically

  11. Vegetated Treatment Area Effectiveness at Reducing Nutrient Runoff from Small Swine Operations in Central Texas 

    E-Print Network [OSTI]

    Higgs, Kori Denise

    2015-02-17

    substantial treatment of the swine facility runoff in terms of reduced NO3-N, NH4-N, PO4-P, TN, and TP mean concentrations (24% - 91%) and total loads (50%-96%), but VTA runoff was still higher in nutrients than the control site. Further research of design...

  12. Diagnosis & Correction of Soil Nutrient Limitations in Intensively managed southern pine forests

    SciTech Connect (OSTI)

    University of Florida

    2002-10-25

    Forest productivity is one manner to sequester carbon and it is a renewable energy source. Likewise, efficient use of fertilization can be a significant energy savings. To date, site-specific use of fertilization for the purpose of maximizing forest productivity has not been well developed. Site evaluation of nutrient deficiencies is primarily based on empirical approaches to soil testing and plot fertilizer tests with little consideration for soil water regimes and contributing site factors. This project uses mass flow diffusion theory in a modeling context, combined with process level knowledge of soil chemistry, to evaluate nutrient bioavailability to fast-growing juvenile forest stands growing on coastal plain Spodosols of the southeastern U.S. The model is not soil or site specific and should be useful for a wide range of soil management/nutrient management conditions. In order to use the model, field data of fast-growing southern pine needed to be measured and used in the validation of the model. The field aspect of the study was mainly to provide data that could be used to verify the model. However, we learned much about the growth and development of fast growing loblolly. Carbon allocation patterns, root shoot relationships and leaf area root relationships proved to be new, important information. The Project Objectives were to: (1) Develop a mechanistic nutrient management model based on the COMP8 uptake model. (2) Collect field data that could be used to verify and test the model. (3) Model testing.

  13. Treatability study of industrial waste using sanitary sewage to supply nutrients 

    E-Print Network [OSTI]

    Ferguson, James Ritchie

    1978-01-01

    Activated sludge Anaerobic digestion Centrifuging Chemical coagulation Chemical oxidation or reduction Distillation and stripping Extraction Fermentation Filtration Flotation (air) Incineration Stabilization ponds Wet oxidation Lagooning... treatment by biological treatment methods. The most effective biological process is the activated sludge process. To treat most petrochemical industrial wastewaters by the activated sludge process requires the addition of the nutrients nitrogen...

  14. Prediction of sediment-bound nutrient delivery from semi-arid California watersheds

    E-Print Network [OSTI]

    Gabet, Emmanuel "Manny"

    Prediction of sediment-bound nutrient delivery from semi-arid California watersheds Emmanuel J, University of California, Santa Barbara, California, USA Received 4 March 2005; revised 16 June 2005 in soil to account explicitly for hillslope sediment transport processes that yield sediment

  15. Nutrient Management in North Deanna L. Osmond, NCSU, Dept. Soil Science

    E-Print Network [OSTI]

    Nutrient Management in North Carolina Deanna L. Osmond, NCSU, Dept. Soil Science Carroll Pierce, NC Carolina 43 M Turkeys $ 452 M #1 US 712 M Broilers $ 1.7 B #4 US 9.6 M Swine $ 1.7 B #2 US #12;Crop Agriculture in North Carolina Tobacco $ 719 M Cotton $ 254 M Soybeans $185 M Corn $184 M #12;Crop Production

  16. vol. 171, no. 4 the american naturalist april 2008 Nutrient Recycling Affects Autotroph and

    E-Print Network [OSTI]

    Ostling, Annette

    a stoichiometrically explicit model of autotroph growth, incorporating Michaelis- Menten-Monod nutrient uptake kinetics, an aquatic, and two terrestrial ecosystems. Preferential P recycling, in conjunction with greater relative P constancy of C : N : P ratios within terrestrial biomes and throughout the world's oceans suggests

  17. Exploring structural definitions of mycorrhizas, with emphasis on nutrient-exchange interfaces1

    E-Print Network [OSTI]

    Massicotte, Hugues

    Exploring structural definitions of mycorrhizas, with emphasis on nutrient-exchange interfaces1 R for symbiotic associations of some leafy liverworts. An important feature of mycorrhizas is the interface and ectendomycorrhizas. In ectomycorrhizas, the apoplastic interface consists of plant cell wall and fungal cell wall

  18. Nutrient Bioaccumulation in Phragmites australis: Management Tool for Reduction of Pollution

    E-Print Network [OSTI]

    Murcia, Universidad de

    Phragmites australis . Nutrients . Bioaccumulation . Mar Menor. Water pollution 1 Introduction Reed in a wide range of aquatic habitats Water Air Soil Pollut (2010) 205:173­185 DOI 10.1007/s11270-009-0064-2 M commonly used in constructed wetlands for the enhancement of water quality in water treatment systems

  19. LineVISAR. A fringe-trace data analysis program

    SciTech Connect (OSTI)

    Furnish, Michael D.

    2014-02-01

    The line-imaging ORVIS or VISAR provides velocity as a function of position and time for a line on an experimental setup via a streak camera record of interference fringes. This document describes a Matlab-based program which guides the user through the process of converting these fringe data to a velocity surface. The data reduction is of the "fringe trace" type, wherein the changes in velocity at a given position on the line are calculated based on fringe motion past that point. The analyst must establish the fringe behavior up front, aided by peak-finding routines in the program. However, the later work of using fringe jumps to compensate for phase problems in other analysis techniques is greatly reduced. This program is not a standard GUI construction, and is prescriptive. At various points it saves the progress, allowing later restarts from those points.

  20. Micro-PIXE Analysis of Trace Elements in Sulfides

    SciTech Connect (OSTI)

    Hickmott, D.D.; Wetteland, C.; Stimac, J.; Larocque, A.C.L.; Brearley, A.

    2003-08-26

    Micro-scale Proton-induced X-ray Emission (PIXE) of trace elements (TE) in sulfides provides insights into geologic processes including magmatic system evolution, ore forming events, and fluid-flow processes. The Los Alamos nuclear microprobe was used to determine TE concentrations and ratios in sulfides from diverse geologic environments including hydrothermal ore deposits, coal seams, and metamorphic rocks. Pyrrhotite (Po) from silicic volcanics contains high Cu and Ni; Po from the Clear Lake volcanic field has higher Mo than does Po from other volcanic fields. Coal pyrites contain high Cu, As, Se, Mo and Pb, and show high As/Se and Mo/Se in marine influenced sulfides from the Lower Kittanning coal, but not in other marine-influenced coals. Sulfides are amenable to micro-PIXE studies because of the difficulties in obtaining the homogeneous standards required for many other TE microanalytical techniques.

  1. Time traces of individual kinesin motors suggest functional heterogeneity

    E-Print Network [OSTI]

    Reddy, Babu J N; Xu, Jing; Mattson, Michelle; Arabi, Karim; Vershinin, Michael; Gross, Steven; Hyeon, Changbong

    2015-01-01

    Conventional analysis of in vitro assays of motor proteins rests on the assumption that all proteins with the same chemical composition function identically; however molecule-to-molecule variation is often seen even in well-controlled experiments. In an effort to obtain a statistically meaningful set of time traces that simultaneously avoid any experimental artifacts, we performed quantum-dot labeled kinesin experiments on both surface and levitated microtubules. Similar to glassy systems, we found that mean velocities of individual kinesin motors vary widely from one motor to another, the variation of which is greater than that expected from the stochastic variation of stepping times. In the presence of heterogeneity, an ensemble-averaged quantity such as diffusion constant or randomness parameter is ill-defined. We propose to analyze heterogeneous data from single molecule measurements by decomposing them into homogeneous subensembles.

  2. Differential equations to compute $\\hbar$ corrections of the trace formula

    E-Print Network [OSTI]

    Gabor Vattay

    1994-09-19

    In this paper a new method for computation of higher order corrections to the saddle point approximation of the Feynman path integral is discussed. The saddle point approximation leads to local Schr\\"odinger problems around classical orbits. Especially, the saddle point approximation leads to Schr\\"odinger problems around classical periodic orbits when it is applied to the trace of Green's function. These local Schr\\"odinger problems, in semiclassical approximation, can be solved exactly on the basis of local analytic functions. Then the corrections of the semiclassical result can be treated perturbatively. The strength of the perturbation is proportional to $\\hbar$. The perturbation problem leads to ordinary differential equations. We propose these equations for numerical calculation of corrections, since they can easily be solved by computers. We give quantum mechanical generalizations of the semiclassical zeta functions. Two simple examples are included in order to demonstrate the effectiveness of the method.

  3. The behavior of trace metals in the Geum Estuary, Korea

    SciTech Connect (OSTI)

    Byrd, J.T.; Smith, R.G.; Windom, H.L. (Skidaway Inst. of Oceanography, Savannah, GA (United States)); Lee, Kwang, W. (Hanyang Univ. Ansan, Kyunggi (Korea)); Lee, Dong, S. (Korea Ocean Research and Development Inst., Ansan, Kyunggi (Korea))

    1991-05-01

    The distributions of trace metals in the Geum Estuary of western Korea were studied with regard to changes in other estuarine chemical parameters. Dissolved oxygen, pH, and alkalinity increased with increasing salinity. Dissolved aluminum concentrations increased at low salinities and were perhaps influenced by the solubility of particulate aluminosilicate phases. Iron, manganese, cobalt, and zinc are removed from solution in the low salinity end of the estuary. Cobalt and nickel have mid-estuary concentration maxima that may be due to an anthropogenic source. Cadmium, copper, lead, and zinc concentrations also increased in the estuary, possibly as th result of remobilization in the sediments. Cadmium increases are also linked to remineralization from tidal flat sediments in the outer estuary. The source of an increase in dissolved lead at low salinity is unclear, but may be due to release from particles.

  4. Adaptive Ray Tracing for Radiative Transfer around Point Sources

    E-Print Network [OSTI]

    Tom Abel; Benjamin D. Wandelt

    2001-11-01

    We describe a novel adaptive ray tracing scheme to solve the equation of radiative transfer around point sources in hydrodynamical simulations. The angular resolution adapts to the local hydrodynamical resolution and hence is of use for adaptive meshes as well as adaptive smooth particle hydrodynamical simulations. Recursive creation of rays ensures ease of implementation. The multiple radial integrations needed to solve the time dependent radiative transfer are sped up significantly using a quad-tree once the rays are cast. Simplifications advantageous for methods with one radiation source are briefly discussed. The suggested method is easily generalized to speed up Monte Carlo radiative transfer techniques. In summary a nearly optimal use of long characteristics is presented and aspects of its implementation and comparison to other methods are given.

  5. Farfield Tracing of a Point Source Discharge Plume in the Coastal

    E-Print Network [OSTI]

    , Florida 33004 Pathways and dilution of a point source ocean discharge in the farfield (10-66 km) were the relative contributions of potential terrestrial and oceanic sources to the nutrients

  6. Dynamic Reconstruction

    E-Print Network [OSTI]

    Horn, Berthold Klaus Paul

    Dynamic reconstruction is a method for generating images or image sequences from data obtained using moving radiation detection systems. While coded apertures are used as examples of the underlying information collection ...

  7. Green Algae as Model Organisms for Biological Fluid Dynamics

    E-Print Network [OSTI]

    Goldstein, Raymond E

    2014-01-01

    In the past decade the volvocine green algae, spanning from the unicellular $Chlamydomonas$ to multicellular $Volvox$, have emerged as model organisms for a number of problems in biological fluid dynamics. These include flagellar propulsion, nutrient uptake by swimming organisms, hydrodynamic interactions mediated by walls, collective dynamics and transport within suspensions of microswimmers, the mechanism of phototaxis, and the stochastic dynamics of flagellar synchronization. Green algae are well suited to the study of such problems because of their range of sizes (from 10 $\\mu$m to several millimetres), their geometric regularity, the ease with which they can be cultured and the availability of many mutants that allow for connections between molecular details and organism-level behavior. This review summarizes these recent developments and highlights promising future directions in the study of biological fluid dynamics, especially in the context of evolutionary biology, that can take advantage of these re...

  8. Green Algae as Model Organisms for Biological Fluid Dynamics

    E-Print Network [OSTI]

    Raymond E. Goldstein

    2014-09-08

    In the past decade the volvocine green algae, spanning from the unicellular $Chlamydomonas$ to multicellular $Volvox$, have emerged as model organisms for a number of problems in biological fluid dynamics. These include flagellar propulsion, nutrient uptake by swimming organisms, hydrodynamic interactions mediated by walls, collective dynamics and transport within suspensions of microswimmers, the mechanism of phototaxis, and the stochastic dynamics of flagellar synchronization. Green algae are well suited to the study of such problems because of their range of sizes (from 10 $\\mu$m to several millimetres), their geometric regularity, the ease with which they can be cultured and the availability of many mutants that allow for connections between molecular details and organism-level behavior. This review summarizes these recent developments and highlights promising future directions in the study of biological fluid dynamics, especially in the context of evolutionary biology, that can take advantage of these remarkable organisms.

  9. Trace Reduction for Virtual Memory Simulations Scott F. Kaplan, Yannis Smaragdakis, and Paul R. Wilson

    E-Print Network [OSTI]

    Smaragdakis, Yannis

    reduction techniques. In this paper we present two new algorithms for trace re- duction | Safely AllowedTrace Reduction for Virtual Memory Simulations Scott F. Kaplan, Yannis Smaragdakis, and Paul R Drop SAD and Optimal LRU Reduction OLR. Both achieve high reduction factors and guarantee exact

  10. Trace Reduction for Virtual Memory Simulations Scott F. Kaplan, Yannis Smaragdakis, and Paul R. Wilson \\Lambda

    E-Print Network [OSTI]

    Kaplan, Scott

    reduction techniques. In this paper we present two new algorithms for trace re­ duction --- Safely AllowedTrace Reduction for Virtual Memory Simulations Scott F. Kaplan, Yannis Smaragdakis, and Paul R Drop (SAD) and Optimal LRU Reduction (OLR). Both achieve high reduction factors and guarantee exact

  11. Trace Reduction for Virtual Memory Simulations Scott F. Kaplan, Yannis Smaragdakis, and Paul R. Wilson

    E-Print Network [OSTI]

    Kaplan, Scott

    reduction techniques. In this paper we present two new algorithms for trace re- duction | Safely AllowedTrace Reduction for Virtual Memory Simulations Scott F. Kaplan, Yannis Smaragdakis, and Paul R Drop (SAD) and Optimal LRU Reduction (OLR). Both achieve high reduction factors and guarantee exact

  12. Laser Spectroscopic Trace-Gas Sensor Networks for Atmospheric Monitoring Applications

    E-Print Network [OSTI]

    Zhong, Lin

    Laser Spectroscopic Trace-Gas Sensor Networks for Atmospheric Monitoring Applications Stephen So@princeton.edu ABSTRACT Laser-based atmospheric trace-gas sensors have great potential for long-term, real a laser based chemical sensing technology with wide-area autonomous wireless sensor networking

  13. Elevated Trace Element Concentrations in Southern Toads, Bufo terrestris, Exposed to Coal Combustion Waste

    E-Print Network [OSTI]

    Hopkins, William A.

    Elevated Trace Element Concentrations in Southern Toads, Bufo terrestris, Exposed to Coal, and behavioral abnormalities in amphibians to coal combustion wastes (coal ash). Few studies, however, have determined trace element concentrations in amphibians exposed to coal ash. In the current study we compare

  14. Gas Source Tracing With a Mobile Robot Using an Adapted Moth Strategy

    E-Print Network [OSTI]

    Zell, Andreas

    Gas Source Tracing With a Mobile Robot Using an Adapted Moth Strategy Achim Lilienthal, Denis,reiman,zell}@informatik.uni-tuebingen.de Abstract. As a sub-task of the general gas source localisation problem, gas source tracing is supposed to guide a gas-sensitive mobile system towards a source by using the cues determined from the gas

  15. Trace formula for systems with spin from the coherent state propagator

    E-Print Network [OSTI]

    de Aguiar, Marcus A. M.

    Trace formula for systems with spin from the coherent state propagator A. D. Ribeiroa Instituto de November 2007 We present a detailed derivation of the trace formula for a general Hamiltonian with two the semiclassical formula for the propagator in a basis formed by the product of a canonical and a spin coherent

  16. REGULAR TRACE FORMULA AND BASE CHANGE FOR GLn Yuval Z. Flicker

    E-Print Network [OSTI]

    Flicker, Yuval

    REGULAR TRACE FORMULA AND BASE CHANGE FOR GLn Yuval Z. Flicker Department of Mathematics, The Ohio aim here is to develop the regular trace formula of F2 from the context of GL2 to that of a reductive representations of GLn which have a supercuspidal component. Our motivation is the belief that a formula

  17. RAY TRACING IN THE SMOOTHED ACOUSTIC SEG/EAGE SALT MODEL.

    E-Print Network [OSTI]

    Cerveny, Vlastislav

    RAY TRACING IN THE SMOOTHED ACOUSTIC SEG/EAGE SALT MODEL. PART 2: MAPS OF REFLECTIONS V â?? ACLAV­wave reflected from the flat bottom interface in the smoothed acoustic SEG/EAGE Salt Model are calculated of the large shadow area below the trunk of the salt body is discussed. KEY WORDS Velocity model, ray tracing

  18. Generating Trace-Sets for Model-based Testing Birgitta Lindstrom

    E-Print Network [OSTI]

    Offutt, Jeff

    into a powerful technique for automatic formal ver- ification of transition systems. Researchers have devel- oped University Fairfax, VA 22030, USA E-mail: offutt@gmu.edu Abstract Model-checkers are powerful tools that can to a number of problems. Instead of individual traces, software testing needs sets of traces that satisfy

  19. A Compilation of New and Published Major and Trace Element Data for NIST SRM 610

    E-Print Network [OSTI]

    A Compilation of New and Published Major and Trace Element Data for NIST SRM 610 and NIST SRM 612. NIST however, only certifies up to eight elements in these glasses. Here we have compiled concentration laboratories. Compilations are presented for the matrix composition of these glasses and for fifty eight trace

  20. Detecting Climate Change in Multivariate Time Series Data by Novel Clustering and Cluster Tracing Techniques

    E-Print Network [OSTI]

    Detecting Climate Change in Multivariate Time Series Data by Novel Clustering and Cluster Tracing Aachen University, Germany {kremer, guennemann, seidl}@cs.rwth-aachen.de Abstract--Climate change can series, and trace the clusters over time. A climate pattern is categorized as a changing pattern

  1. MH-TRACE: MULTI-HOP TIME RESERVATION USING ADAPTIVE CONTROL FOR ENERGY EFFICIENCY

    E-Print Network [OSTI]

    Heinzelman, Wendi

    MH-TRACE: MULTI-HOP TIME RESERVATION USING ADAPTIVE CONTROL FOR ENERGY EFFICIENCY Bulent Tavli, Rochester, NY 14627 Abstract- Multi-Hop Time Reservation Using Adaptive Control for Energy Efficiency (MH-TRACE) is a distributed MAC protocol for energy efficient real-time packet broadcasting in a multi-hop radio network

  2. How Different Electrical Circuits of ECC Designs Influence the Shape of Power Traces measured on

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    How Different Electrical Circuits of ECC Designs Influence the Shape of Power Traces measured and the electrical circuit of devices, that are identical to the target, is analyzed. By side channel attacks usually of the electrical circuit of a cryptographic implementation on the shape of the resulting power trace, because

  3. TRACE METAL CONTENT OF COAL AND ASH AS DETERMINED USING SCANNINGELECTRON MICROSCOPYWITE

    E-Print Network [OSTI]

    Laughlin, Robert B.

    TRACE METAL CONTENT OF COAL AND ASH AS DETERMINED USING SCANNINGELECTRON MICROSCOPYWITE WAVELENGTH and ash. Hg, As. Ni, and Se have been detected in individualpyrite grains in Illinois#6 coal at levels up #6 coal. The same trace metals were detected in pyrite and clay grains from Pittsburgh #8 coal. Ash

  4. The trace on the Ktheory of group C # algebras Thomas Schick #

    E-Print Network [OSTI]

    The trace on the K­theory of group C # ­algebras Thomas Schick # FB Mathematik --- Uni M to be countable. The trace tr G : CG # C : P g#G # g g ## # 1 (where # e­mail: thomas.schick stay at Penn State University funded by the DAAD 1 #12; 2 Thomas Schick 1 is the neutral element of G

  5. Trace metal concentration and fish size: Variation among fish species in a Mediterranean river

    E-Print Network [OSTI]

    García-Berthou, Emili

    Trace metal concentration and fish size: Variation among fish species in a Mediterranean river 29 April 2014 Accepted 12 May 2014 Keywords: Bioaccumulation Heavy metals Llobregat River Mediterranean Cyprinid fish a b s t r a c t Concentration of trace metals (Al, Mn, Fe, Co, Ni, Cu, Zn, Cd, Pb

  6. A mixed dataflow algorithm for ray tracing on the CRAY T3E

    E-Print Network [OSTI]

    Nebel, Jean-Christophe

    -Etienne Cedex 2 FRANCE FRANCE Abstract The ray tracing scheme is one of the most complete and efficient promising way to improve ray traced pictures productions seems to be parallelization which offers both propose a mixed dataflow approach : each message will contain several pieces of information on both

  7. Microbial acidification and pH effects on trace element release from sewage sludge

    E-Print Network [OSTI]

    Microbial acidification and pH effects on trace element release from sewage sludge Shabnam Qureshia sludge (sewage biosolids) are potentially phyto- or zoo-toxic if present in sufficient concentration wastewater sludge appears to be that of acidification. Abstract Leaching of sludge-borne trace elements has

  8. Scaling plant nitrogen use and uptake efficiencies in response to nutrient addition in peatlands

    SciTech Connect (OSTI)

    Iversen, Colleen M [ORNL; Bridgham, Scott [University of Oregon; Kellogg, Laurie E. [University of Minnesota, St Paul

    2010-01-01

    Nitrogen (N) is the primary growth-limiting nutrient in many terrestrial ecosystems, and therefore plant production per unit N taken up (i.e., N use efficiency, NUE) is a fundamentally important component of ecosystem function. Nitrogen use efficiency comprises two components: N productivity (AN, plant production per peak biomass N content) and the mean residence time of N in plant biomass (MRTN). We utilized a five-year fertilization experiment to examine the manner in which increases in N and phosphorus (P) availability affected plant NUE at multiple biological scales (i.e., from leaf to community level). We fertilized a natural gradient of nutrient-limited peatland ecosystems in the Upper Peninsula of Michigan, USA, with 6 g Nm2yr1, 2 g Pm2yr1, or a combination of N and P. Our objectives were to determine how changes in carbon and N allocation within a plant to leaf and woody tissue and changes in species composition within a community, both above- and belowground, would affect (1) NUE; (2) the adaptive trade-off between the components of NUE; (3) the efficiency with which plants acquired N from the soil (N uptake efficiency); and (4) plant community production per unit soil N availability (N response efficiency, NRE). As expected, N and P addition generally increased aboveground production and N uptake. In particular, P availability strongly affected the way in which plants took up and used N. Nitrogen use efficiency response to nutrient addition was not straightforward. Nitrogen use efficiency differed between leaf and woody tissue, among species, and across the ombrotrophic minerotrophic gradient because plants and communities were adapted to maximize either AN or MRTN, but not both concurrently. Increased N availability strongly decreased plant and community N uptake efficiency, while increased P availability increased N uptake efficiency, particularly in a nitrogen-fixing shrub. Nitrogen uptake efficiency was more important in controlling overall plant community response to soil N availability than was NUE, and above- and belowground community N uptake efficiencies responded to nutrient addition in a similar manner. Our results demonstrate that plants respond to nutrient availability at multiple biological scales, and we suggest that N uptake efficiency may be a more representative measurement of plant responses to nutrient availability gradients than plant NUE.

  9. A boundary integral formalism for stochastic ray tracing in billiards

    E-Print Network [OSTI]

    David J. Chappell; Gregor Tanner

    2014-11-06

    Determining the flow of rays or particles driven by a force or velocity field is fundamental to modelling many physical processes, including weather forecasting and the simulation of molecular dynamics. High frequency wave energy distributions can also be approximated using flow or transport equations. Applications arise in underwater and room acoustics, vibro-acoustics, seismology, electromagnetics, quantum mechanics and in producing computer generated imagery. In many practical applications, the driving field is not known exactly and the dynamics are determined only up to a degree of uncertainty. This paper presents a boundary integral framework for propagating flows including uncertainties, which is shown to systematically interpolate between a deterministic and a completely random description of the trajectory propagation. A simple but efficient discretisation approach is applied to model uncertain billiard dynamics in an integrable rectangular domain.

  10. Hyperspectral remote sensing analysis of short rotation woody crops grown with controlled nutrient and irrigation treatments.

    SciTech Connect (OSTI)

    Im, Jungho; Jensen, John R.; Coleman, Mark; Nelson, Eric

    2009-04-01

    Abstract - Hyperspectral remote sensing research was conducted to document the biophysical and biochemical characteristics of controlled forest plots subjected to various nutrient and irrigation treatments. The experimental plots were located on the Savannah River Site near Aiken, SC. AISA hyperspectral imagery were analysed using three approaches, including: (1) normalized difference vegetation index based simple linear regression (NSLR), (2) partial least squares regression (PLSR) and (3) machine-learning regression trees (MLRT) to predict the biophysical and biochemical characteristics of the crops (leaf area index, stem biomass and five leaf nutrients concentrations). The calibration and cross-validation results were compared between the three techniques. The PLSR approach generally resulted in good predictive performance. The MLRT approach appeared to be a useful method to predict characteristics in a complex environment (i.e. many tree species and numerous fertilization and/or irrigation treatments) due to its powerful adaptability.

  11. Nutrient Content of Beef Steaks as Influenced by USDA Quality Grade and Degree of Doneness 

    E-Print Network [OSTI]

    Smith, Amanda M.

    2010-07-14

    for the designation as UNDERGRADUATE RESEARCH SCHOLAR A Senior Scholars Thesis by AMANDA MARIAN SMITH Approved by: Co-Research Advisors: Jeffrey W. Savell Kerri B. Harris Associate Dean for Undergraduate Research: Robert C. Webb Major: Animal... QUALITY GRADE AND DEGREE OF DONENESS A Senior Scholars Thesis by AMANDA MARIAN SMITH iii ABSTRACT Nutrient Content of Beef Steaks as Influenced by USDA Quality Grade and Degree of Doneness. (April 2010) Amanda Marian Smith Department...

  12. Turbulence transmission in parallel modified shocks using ray tracing

    E-Print Network [OSTI]

    Joni Tammi; Rami Vainio

    2006-09-14

    We apply a semi-classical approach of handling waves as quasiparticle gas in a slowly varying flow -- analogous to ray tracing -- to calculate the Alfven wave transmission parameters, the resulting cross-helicity of the waves and the scattering-centre compression ratio, for cases where the shock thickness is large enough for the turbulent waves in the plasma to see the transition of the background flow parameters as smooth and slowly varying. For nonrelativistic shocks the wave transmission produces similar effects on the downstream turbulence and the scattering-centre compression ratio as does the transmission through a step shock: the downstream Alfven waves propagate predominantly towards the shock in the local plasma frame and, thus, the scattering-centre compression ratio is larger than the gas compression ratio. For thick relativistic shocks, however, we find qualitative differences with respect to the step-shock case: for low-Alfvenic-Mach-number shocks the downstream waves propagate predominantly away from the shock, and the scattering-centre compression ratio is lower than that of the gas. Thus, when taken into account, the Alfven wave transmission can decrease the efficiency of the first-order Fermi acceleration in a thick relativistic shock.

  13. Rate of gravitational inflaton decay via gauge trace anomaly

    E-Print Network [OSTI]

    Yuki Watanabe

    2011-04-26

    We analyze decay processes of the inflaton field, phi, during the coherent oscillation phase after inflation in f(phi)R gravity. It is inevitable that the inflaton decays gravitationally into gauge fields in the presence of f(phi)R coupling. We show a concrete calculation of the rate that the inflaton field decays into a pair of gauge fields via the trace anomaly. Comparing this new decay channel via the anomaly with the channels from the tree-level analysis, we find that the branching ratio crucially depends on masses and the internal multiplicities (flavor quantum number) of decay product particles. While the inflaton decays exclusively into light fields, heavy fields still play a role in quantum loops. We argue that this process in principle allows us to constrain the effects of arbitrary heavy particles in the reheating. We also apply our analysis to Higgs inflation, and find that the gravitational decay rate would never exceed gauge interaction decay rates if quantum gravity is unimportant.

  14. Speciation and distribution of arsenic and localization of nutrients in rice grains

    SciTech Connect (OSTI)

    Lombi, E.; Scheckel, K.G.; Pallon, J.; Carey, A.M.; Zhu, Y.G.; Meharg, A.A. (EPA); (UCopenhagen); (Aberdeen); (Lund); (Chinese Aca. Sci.)

    2012-09-05

    Arsenic (As) contamination of rice grains and the generally low concentration of micronutrients in rice have been recognized as a major concern for human health. Here, we investigated the speciation and localization of As and the distribution of (micro)nutrients in rice grains because these are key factors controlling bioavailability of nutrients and contaminants. Bulk total and speciation analyses using high-pressure liquid chromatography (HPLC)-inductively coupled plasma mass spectrometry (ICP-MS) and X-ray absorption near-edge spectroscopy (XANES) was complemented by spatially resolved microspectroscopic techniques ({mu}-XANES, {mu}-X-ray fluorescence ({mu}-XRF) and particle induced X-ray emission (PIXE)) to investigate both speciation and distribution of As and localization of nutrients in situ. The distribution of As and micronutrients varied between the various parts of the grains (husk, bran and endosperm) and was characterized by element-specific distribution patterns. The speciation of As in bran and endosperm was dominated by As(III)-thiol complexes. The results indicate that the translocation from the maternal to filial tissues may be a bottleneck for As accumulation in the grain. Strong similarities between the distribution of iron (Fe), manganese (Mn) and phosphorus (P) and between zinc (Zn) and sulphur (S) may be indicative of complexation mechanisms in rice grains.

  15. Neutron Emission Spectroscopy of Fuel Ion Rotation and Fusion Power Components Demonstrated in the Trace Tritium Experiments at JET

    E-Print Network [OSTI]

    Neutron Emission Spectroscopy of Fuel Ion Rotation and Fusion Power Components Demonstrated in the Trace Tritium Experiments at JET

  16. Development of a Novel Contamination Resistant Ionchamber for Process Tritium Measurement and use in the JET First Trace Tritium Experiment

    E-Print Network [OSTI]

    Development of a Novel Contamination Resistant Ionchamber for Process Tritium Measurement and use in the JET First Trace Tritium Experiment

  17. STRUCTURE ET ENREGISTREMENT DES TRACES LATENTES D'IONS ARGON ET FER DANS L'OLIVINE ET LE MICA MUSCOVITE

    E-Print Network [OSTI]

    Boyer, Edmond

    attaque chimique : l'enre- gistrement des traces n'apparaît pas lié à un mécanisme à seuil énergétique

  18. Determination of Method Detection Limits for Trace 232-Thorium and 238-Uranium in Copper using Ion Exchange and ICPMS

    SciTech Connect (OSTI)

    Hoppe, Eric W.; LaFerriere, Brian D.; Maiti, Tapas C.; Soin, Aleksandr

    2014-04-15

    Determination of Method Detection Limits for Trace 232-Thorium and 238-Uranium in Copper using Ion Exchange and ICPMS

  19. Chemical and dynamical discontinuity at the extratropical tropopause based on START08 and WACCM analyses

    E-Print Network [OSTI]

    Pan, Laura

    Chemical and dynamical discontinuity at the extratropical tropopause based on START08 and WACCM gas gradients of O3 and CO, the discontinuity in the chemical composition of the upper troposphere (UT good consistency between the chemical discontinuity in trace gas distributions and the PV gradientbased

  20. Dynamical patterns of cattle trade movements Paolo Bajardi1,2

    E-Print Network [OSTI]

    Barrat, Alain

    Dynamical patterns of cattle trade movements Paolo Bajardi1,2 , Alain Barrat2,3 , Fabrizio Natale4 cattle movements that reports the mobility of individual animals among farms on a daily basis cattle identification and tracing systems have also been implemented in other countries [5]. Detailed

  1. Scheduling Data Collection with Dynamic Traffic Patterns in Wireless Sensor Networks

    E-Print Network [OSTI]

    Tang, Xueyan

    collection. Experimental results using real- world data traces show that, compared with existing schedules and time efficiency of sensor data collection with dynamic traffic patterns. I. INTRODUCTION Energy networks. Energy efficiency concerns the amount of energy spent in data collection. Since sensor nodes

  2. Dynamical Energy Analysis - determining wave energy distributions in complex vibro-acoustical structures

    E-Print Network [OSTI]

    Gregor Tanner

    2008-03-12

    We propose a new approach towards determining the distribution of mechanical and acoustic wave energy in complex built-up structures. The technique interpolates between standard Statistical Energy Analysis (SEA) and full ray tracing containing both these methods as limiting case. By writing the flow of ray trajectories in terms of linear phase space operators, it is suggested here to reformulate ray-tracing algorithms in terms of boundary operators containing only short ray segments. SEA can now be identified as a low resolution ray tracing algorithm and typical SEA assumptions can be quantified in terms of the properties of the ray dynamics. The new technique presented here enhances the range of applicability of standard SEA considerably by systematically incorporating dynamical correlations wherever necessary. Some of the inefficiencies inherent in typical ray tracing methods can be avoided using only a limited amount of the geometrical ray information. The new dynamical theory - Dynamical Energy Analysis (DEA) - thus provides a universal approach towards determining wave energy distributions in complex structures.

  3. Comparative assessment of the trace-element composition of coals, crude oils, and oil shales

    SciTech Connect (OSTI)

    M.Y. Shpirt; S.A. Punanova

    2007-10-15

    A comparative analysis of the amounts of 42 trace elements in coals, crude oils, and oil and black shales was performed. The degree of concentration of trace elements by caustobioliths and their ashes relative to their abundance in argillaceous rocks and the Earth's crust was calculated. Typomorphic trace elements were distinguished, of which many turned out to be common for the different kinds of caustobioliths in question. The trace elements were classified according to their concentration factors in different caustobioliths. The ash of crude oils is enriched in trace elements (Cs, V, Mo, Cu, Ag, Au, Zn, Hg, Se, Cr, Co, Ni, U) to the greatest extent (concentration factor above 3.5) and that of oil shales is enriched to the least extent (Re, Cs, Hg, Se). The ratios between typomorphic trace elements in general strongly differ from those in the Earth's crust and argillaceous rocks and are not identical in different caustobioliths. Quantitative parameters that make it possible to calculate a change in these ratios on passing from one caustobiolith type to another were proposed and the relative trace-element affinity of different caustobioliths was estimated.

  4. The trace of the CNO cycle in the ring nebula NGC 6888

    SciTech Connect (OSTI)

    Mesa-Delgado, A.; Esteban, C.; García-Rojas, J.; Reyes-Pérez, J.; Morisset, C.; Bresolin, F.

    2014-04-20

    We present new results on the chemical composition of the Galactic ring nebula NGC 6888 surrounding the WN6(h) star WR136. The data are based on deep spectroscopical observations taken with the High Dispersion Spectrograph at the 8.2 m Subaru Telescope. The spectra cover the optical range from 3700 to 7400 Å. The effect of the CNO cycle is well-identified in the abundances of He, N, and O, while elements not involved in the synthesis such as Ar, S, and Fe present values consistent with the solar vicinity and the ambient gas. The major achievement of this work is the first detection of the faint C II ?4267 recombination line in a Wolf-Rayet nebula. This allows us to estimate the C abundance in NGC 6888 and therefore investigate for the first time the trace of the CNO cycle in a ring nebula around a Wolf-Rayet star. Although the detection of the C II line has a low signal-to-noise ratio, the C abundance seems to be higher than the predictions of recent stellar evolution models of massive stars. The Ne abundance also shows a puzzling pattern with an abundance of about 0.5 dex lower than the solar vicinity, which may be related to the action of the NeNa cycle. Attending to the constraints imposed by the dynamical timescale and the He/H and N/O ratios of the nebula, the comparison with stellar evolution models indicates that the initial mass of the stellar progenitor of NGC 6888 is between 25 M {sub ?} and 40 M {sub ?}.

  5. Chapter 2: Sources and Deposition of Trace Metals 2.1 Main Sources of Atmospheric Pollution...............................................7

    E-Print Network [OSTI]

    Short, Daniel

    5 Chapter 2: Sources and Deposition of Trace Metals 2.1 Main Sources of Atmospheric Pollution distances causing regional or global pollution. Fig. 2.1: Sources of trace metals in the environment. Contamination of the atmosphere by pollutant trace metals affects the environment directly through its impact

  6. Effects of Nutrient Supply and Cooling on Growth, Flower Bud Differentiation, and Propagation of the Nobile Dendrobium Orchid 

    E-Print Network [OSTI]

    Yen, Christine Yung-Ting

    2009-05-15

    Studies of Dendrobium Sea Mary ‘Snow King’ investigated the effect of nutrient termination (1 Aug., 1 Sept., or 1 Oct.) and reapplication [at the beginning, in the middle, immediately after, or 2 weeks after (relative to ...

  7. Community Metabolism Along Nutrient and Salinity Gradients of the Potomac River Estuary: An Application from Continuous Monitoring Sites

    E-Print Network [OSTI]

    Boynton, Walter R.

    Community Metabolism Along Nutrient and Salinity Gradients of the Potomac River Estuary to make metabolism estimates. We used data from 14 of these locations from March through October 2007

  8. The Role of Alternative Respiration Pathways and the Effect of Nutrient Loading on Peat Decomposition in Plum

    E-Print Network [OSTI]

    Vallino, Joseph J.

    1 The Role of Alternative Respiration Pathways and the Effect of Nutrient Loading on Peat by stimulating soil metabolism and increasing translocation of belowground resources to aboveground plant biomass

  9. Importance of physical processes on near-surface nutrient distributions in summer in the northeastern Gulf of Mexico 

    E-Print Network [OSTI]

    Belabbassi, Leila

    2001-01-01

    As part of the northeastern Gulf of Mexico chemical oceanography and hydrography study, data on salinity, nutrients, and surface chlorophyll were collected three times per year over the northeastern Gulf of Mexico along ...

  10. Effects of Varying Nutrient Profiles and Enzyme Supplementation in Broiler Diets on Growth Performance and Energy Digestibility 

    E-Print Network [OSTI]

    Campasino, Ashley Marie 1989-

    2012-11-16

    increasing levels of distillers’ dried grains with Solubles (DDGS) and a non-starch polysaccharide degrading enzyme (NSPase) on energy digestibility. Experiment two evaluated the influence nutrient variation in corn and xylanase supplementation on growth...

  11. Microbial Grazing Lab The microbial loop is responsible for the cycling of nutrients as well as potentially the support of

    E-Print Network [OSTI]

    Vallino, Joseph J.

    the flow of energy and mass to higher trophic levels via the postulated microbial loop. In orderMicrobial Grazing Lab The microbial loop is responsible for the cycling of nutrients as well

  12. Determining Sources of Dissolved Organic Carbon and Nutrients in an Urban Basin Using Novel and Traditional Methods 

    E-Print Network [OSTI]

    Govil, Krittika

    2014-01-03

    Water quality in urban ecosystems is sensitive to localized disturbances potentially affecting those mechanisms which influence nutrient cycles. The Carters Creek Basin has been reported to have elevated concentrations of dissolved organic carbon...

  13. Management of nitrogen and composted biosolids to cycle nutrients and enhance environmental quality during production and after transplanting turfgrass sod 

    E-Print Network [OSTI]

    Schnell, Ronnie Wayne

    2009-05-15

    -point source losses of sediment and nutrients from excavated soils to surface waters. Research objectives were developed to evaluate the options for cycling of MB through turfgrass sod during production and after transplanting. The first objective...

  14. Rory O. Maguire, Extension Nutrient Management Specialist, Virginia Tech Steven E. Heckendorn, Manager, Soil Testing Laboratory, Virginia Tech

    E-Print Network [OSTI]

    Liskiewicz, Maciej

    Rory O. Maguire, Extension Nutrient Management Specialist, Virginia Tech Steven E. Heckendorn, Manager, Soil Testing Laboratory, Virginia Tech Virginia Tech Soil Testing Laboratory Publication 452........................................................................................................6 Determination of P, K Ca, Mg, Zn, Mn, Cu, Fe, B, and Al

  15. Decoupling nutrient signaling from growth rate causes aerobic glycolysis and deregulation of cell size and gene expression

    E-Print Network [OSTI]

    Slavov, Nikolai G.

    To survive and proliferate, cells need to coordinate their metabolism, gene expression, and cell division. To understand this coordination and the consequences of its failure, we uncoupled biomass synthesis from nutrient ...

  16. Influence of inorganic and organic nutrients on aerobic biodegradation and on the adaptation response of subsurface microbial communities

    SciTech Connect (OSTI)

    Swindoll, C.M.; Aelion, C.M.; Pfaender, F.K.

    1988-01-01

    The influence of inorganic and organic amendments on the mineralization of ethylene dibromide, rho-nitrophenol, phenol, and toluene was examined in subsurface soil samples from a pristine aquifer near Lula, Oklahoma. The responses indicate that the metabolic abilities and nutrient requirements of ground water microorganisms vary substantially within an aquifer. In some samples, additions of inorganic nutrients resulted in a more rapid adaptation to the test substrate and a higher rate of metabolism, indicating that metabolism may have been limited by these nutrients. In other samples from the same aquifer layer, inorganic amendments had little or no influence on mineralization. In general, the addition of multiple inorganic nutrients resulted in a greater enhancement of degradation than did the addition of single substances. Additions of alternate carbon sources, such as glucose or amino acids, inhibited the mineralization of the xenobiotic substrates. This inhibition appears to be the result of the preferential utilization of the more easily degradable carbon amendments.

  17. Spatiotemporal focusing dynamics in plasmas at X-ray wavelength

    SciTech Connect (OSTI)

    Sharma, A., E-mail: a-physics2001@yahoo.com; Tibai, Z. [Institute of Physics, University of Pecs, Pecs–7624 (Hungary)] [Institute of Physics, University of Pecs, Pecs–7624 (Hungary); Hebling, J. [Institute of Physics, University of Pecs, Pecs–7624 (Hungary) [Institute of Physics, University of Pecs, Pecs–7624 (Hungary); Szentagothai Research Centre, University of Pecs, Pecs-7624 (Hungary); Mishra, S. K. [Institute for Plasma Research, Gandhinagar (India)] [Institute for Plasma Research, Gandhinagar (India)

    2014-03-15

    Using a finite curvature beam, we investigate here the spatiotemporal focusing dynamics of a laser pulse in plasmas at X-ray wavelength. We trace the dependence of curvature parameter on the focusing of laser pulse and recognize that the self-focusing in plasma is more intense for the X-ray laser pulse with curved wavefront than with flat wavefront. The simulation results demonstrate that spatiotemporal focusing dynamics in plasmas can be controlled with the appropriate choice of beam-plasma parameters to explore the high intensity effects in X-ray regime.

  18. A review of trace element emissions from the combustion of refuse-derived fuel with coal

    SciTech Connect (OSTI)

    Norton, G.A. )

    1992-05-01

    The effects of cocombusting refuse-derived fuel (RDF) with coal on stack emissions of trace elements in the ash stream were reviewed. The large number of variables and uncertainties involved precluded drawing definitive conclusions regarding many of the trace elements. However, it is evident that cocombustion resulted in increased emissions of Cd, Cu, Hg, Pb, and Zn. Emissions of As and Ni tended to decrease when RDF was fired with coal. Modeling studies indicated that ambient levels of trace elements during cocombustion should be within acceptable limits. However, periodic monitoring of Cd, Hg, and Pb may be warranted in some instances.

  19. Estimation of aboveground biomass and inorganic nutrient content of a 25-year-old loblolly pine (Pinus taeda L.) plantation 

    E-Print Network [OSTI]

    Houser, James Nelson

    1980-01-01

    ESTIMATION OF ABOVEGROUND BIOMASS AND INORGANIC NUTRIENT CONTENT OF A 25-YEAR-OLD LOBLOLLY PINE (PINUS TAEDA L. ) PLANTATION A Thesis by JAMES NELSON MOUSER Submitted to the Graduate College of Texas ARM University in partial fulfillment... of the requirement for the degree of MASTER OF SCIENCE August lqBO Major Si bject: Forestry ESTIMATION OF ABOVEGROUND BIOMASS AND INORGANIC NUTRIENT CONTENT OF A 25-YEAR-OLD LOBLOLLY PINE (PINUS TAEDA L. ) PLANTATION A Thesis by JAMES NELSON HOUSER Approved...

  20. Greenhouse and laboratory studies on the effects of an anaerobic digester sludge on growth and nutrient uptake of sorghum 

    E-Print Network [OSTI]

    Vincent, John Cooper

    1989-01-01

    GREENHOUSE AND LABORATORI STUDIES ON THE EFFECTS OF AN ANAEROBIC DIGESTER SLUDGE ON GROWTH AND NUTRIENT UPTAKE OF SORGHUM A Thesis By John Cooper Vincent Submitted to the Office of Graduate Studies Texas A&M University in partial fulfillment... of the requirements for the degree of MASTER OF SCIENCE December 1989 Major Subject: Agronomy GREENHOUSE AND LABORATORy STUDIES ON THE EFFECTS OF AN ANAEROBIC DIGESTER SLUDGE ON GROWTH AND NUTRIENT UPTAKE OF SORGHUM A Thesis by John Cooper Vincent Approved...

  1. Chemical structure and dynamics: Annual report 1996

    SciTech Connect (OSTI)

    Colson, S.D.; McDowell, R.S.

    1997-03-01

    The Chemical Structure and Dynamics (CS&D) program is a major component of the William R. Wiley Environmental Molecular Sciences Laboratory (EMSL) developed by Pacific Northwest National Laboratory (PNNL) to provide a state-of-the-art collaborative facility for studies of chemical structure and dynamics. We respond to the need for a fundamental, molecular-level understanding of chemistry at a wide variety of environmentally important interfaces by (1) extending the experimental characterization and theoretical description of chemical reactions to encompass the effects of condensed media and interfaces; (2) developing a multidisciplinary capability for describing interfacial chemical processes within which the new knowledge generated can be brought to bear on complex phenomena in environmental chemistry and in nuclear waste processing and storage; and (3) developing state-of-the-art analytical methods for characterizing waste tanks and pollutant distributions, and for detecting and monitoring trace atmospheric species.

  2. Chemical structure and dynamics. Annual report 1995

    SciTech Connect (OSTI)

    Colson, S.D.; McDowell, R.S.

    1996-05-01

    The Chemical Structure and Dynamics program is a major component of Pacific Northwest National Laboratory`s Environmental Molecular Sciences Laboratory (EMSL), providing a state-of-the-art collaborative facility for studies of chemical structure and dynamics. We respond to the need for a fundamental, molecular-level understanding of chemistry at a wide variety of environmentally important interfaces by (1) extending the experimental characterization and theoretical description of chemical reactions to encompass the effects of condensed media and interfaces; (2) developing a multidisciplinary capability for describing interfacial chemical processes within which the new knowledge generated can be brought to bear on complex phenomena in environmental chemistry and in nuclear waste processing and storage; and (3) developing state-of-the-art analytical methods for the characterization of waste tanks and pollutant distributions, and for detection and monitoring of trace atmospheric species.

  3. Hydrogen and helium traces in type Ib-c supernovae

    E-Print Network [OSTI]

    A. Elmhamdi; I. J. Danziger; D. Branch; B. Leibundgut; E. Baron; R. P. Kirshner

    2006-04-04

    The spectroscopic properties of a selected optical photospheric spectra of core collapse supernovae (CCSNe) are investigated.Special attention is devoted to traces of hydrogen at early phases. The generated spectra are found to match the observed ones reasonably well, including a list of only 23 candidate ions. Guided by SN Ib 1990I, the observed trough near 6300\\AA is attributed to H$\\alpha$ in almost all Type Ib events, although in some objects it becomes too weak to be discernible, especially at later phases. Alternative line identifications are discussed. Differences in the way hydrogen manifests its presence within CCSNe are highlighted. In Type Ib SNe, the H$\\alpha$ contrast velocity (i.e. line velocity minus the photospheric velocity) seems to increase with time at early epochs, reaching values as high as 8000 km s$^{-1}$ around 15-20 days after maximum and then remains almost constant. The derived photospheric velocities, indicate a lower velocity for Type II SNe 1987A and 1999em as compared to SN Ic 1994I and SN IIb 1993J, while Type Ib events display a somewhat larger variation. The scatter, around day 20, is measured to be $\\sim$5000 km s$^{-1}$. Following two simple approaches, rough estimates of ejecta and hydrogen masses are given. A mass of hydrogen of approximately 0.02 $M_\\odot$ is obtained for SN 1990I, while SNe 1983N and 2000H ejected $\\sim$0.008 $M_\\odot$ and $\\sim$0.08 $M_\\odot$ of hydrogen, respectively. SN 1993J has a higher hydrogen mass, $\\sim 0.7$ $M_\\odot$ with a large uncertainty. A low mass and thin hydrogen layer with very high ejection velocities above the helium shell, is thus the most likely scenario for Type Ib SNe. Some interesting and curious issues relating to oxygen lines suggest future investigations.

  4. RAPID 3D TRACING OF THE MOUSE BRAIN NEUROVASCULATURE WITH LOCAL MAXIMUM INTENSITY PROJECTION AND MOVING WINDOWS 

    E-Print Network [OSTI]

    Han, Dong Hyeop

    2011-10-21

    , I introduce an e ective and e cient ber tracing algorithm for 2D and 3D data. In 2D tracing, I have implemented a Moving Window (MW) method which leads to a mathematical simpli cation and noise robustness in determining the trace di- rection... contributions of this research are as follows. My 2D tracing algorithm is fast enough to analyze, with linear processing time based on ber length, large volumes of biological data and is good at handling branches. The new local MIP approach for 3D tracing...

  5. An inequality for the trace of matrix products, using absolute values

    E-Print Network [OSTI]

    Bernhard Baumgartner

    2011-09-01

    The absolute value of matrices is used in order to give inequalities for the trace of products. An application gives a very short proof of the tracial matrix Hoelder inequality

  6. Building Technologies Program: Tax Deduction Qualified Software- TRACE 700 version 6.2.9

    Broader source: Energy.gov [DOE]

    Provides required documentation that TRACE 700 version 6.2.9 meets Internal Revenue Code §179D, Notice 2006-52, dated June 2, 2006, for calculating commercial building energy and power cost savings.

  7. Building Technologies Program: Tax Deduction Qualified Software- TRACE 700 version 6.2.7

    Broader source: Energy.gov [DOE]

    Provides required documentation that TRACE 700 version 6.2.7 meets Internal Revenue Code §179D, Notice 2006-52, dated June 2, 2006, for calculating commercial building energy and power cost savings.

  8. Building Technologies Program: Tax Deduction Qualified Software- TRACE 700 version 6.2.8

    Broader source: Energy.gov [DOE]

    Provides required documentation that TRACE 700 version 6.2.8 meets Internal Revenue Code §179D, Notice 2006-52, dated June 2, 2006, for calculating commercial building energy and power cost savings.

  9. The Holey Grail A special score function for non-binary traitor tracing

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    The Holey Grail A special score function for non-binary traitor tracing B. Skori´c, J decreases with growing alphabet size. We regret to inform you that this grail has holes. I. INTRODUCTION A

  10. Efficient ray tracing algorithms based on wavefront construction and model based interpolation method 

    E-Print Network [OSTI]

    Lee, Kyoung-Jin

    2006-08-16

    Understanding and modeling seismic wave propagation is important in regional and exploration seismology. Ray tracing is a powerful and popular method for this purpose. Wavefront construction (WFC) method handles wavefronts ...

  11. Acquisition and processing pitfall associated with the clipping of near-surface seismic reflection traces

    E-Print Network [OSTI]

    Sloan, Steven D.; Steeples, Don W.; Malin, Peter E.

    2008-01-01

    The processing of clipped seismic traces may produce high-frequency wavelets that can be misinterpreted as reflections in filtered shot gathers and common-midpoint (CMP) stacked sections. To illustrate this effect, a near-surface CMP seismic...

  12. Role of nuclear analytical probe techniques in biological trace element research

    SciTech Connect (OSTI)

    Jones, K.W.; Pounds, J.G.

    1985-01-01

    Many biomedical experiments require the qualitative and quantitative localization of trace elements with high sensitivity and good spatial resolution. The feasibility of measuring the chemical form of the elements, the time course of trace elements metabolism, and of conducting experiments in living biological systems are also important requirements for biological trace element research. Nuclear analytical techniques that employ ion or photon beams have grown in importance in the past decade and have led to several new experimental approaches. Some of the important features of these methods are reviewed here along with their role in trace element research, and examples of their use are given to illustrate potential for new research directions. It is emphasized that the effective application of these methods necessitates a closely integrated multidisciplinary scientific team. 21 refs., 4 figs., 1 tab.

  13. Investigations on the sediment chronology and trace metal accumulation in Sabine-Neches estuary, Beaumont, Texas 

    E-Print Network [OSTI]

    Ravichandran, Mahalingam

    1994-01-01

    geochronology of sediments and reconstruction of the history of trace metal inputs into this shallow estuarine environment was possible because the 239,240pu profiles closely tracked the bomb fallout history into the environment. The sedimentation rate...

  14. Multivariate statistical evaluation of trace elements in groundwater in a coastal area in Shenzhen, China

    E-Print Network [OSTI]

    Jiao, Jiu Jimmy

    Multivariate statistical evaluation of trace elements in groundwater in a coastal area in Shenzhen August 2006; accepted 2 September 2006 Multivariate statistical analysis was used to investigate Multivariate statistical techniques are efficient ways to display complex relationships among many objects

  15. Removal Efficiencies of a Bioretention System for Trace Metals, PCBs, PAHs, and Dioxins in a Semiarid

    E-Print Network [OSTI]

    Removal Efficiencies of a Bioretention System for Trace Metals, PCBs, PAHs, and Dioxins (concentration or load reductions) were demonstrated for total Hg, polychlori- nated biphenols (PCBs) and dioxins); Metals; Mercury; Dioxins; Stormwater. Introduction Stormwater runoff from streets and parking lots

  16. The trace on the K-theory of group C* -algebras Thomas Schick*

    E-Print Network [OSTI]

    The trace on the K-theory of group C* -algebras Thomas Schick! ~1 (where ___________________________* e-mail: thomas.schick@math.uni-muenster.de www: http 1 #12; 2 Thomas Schick 1 is the neutral

  17. Physical Security and Systems ACCESS REQUEST FORM: Science Wing -TRACES Centre

    E-Print Network [OSTI]

    Boonstra, Rudy

    Status: Areas Requested TRACES Outer Door Level 1: Post Doc Fellow/Faculty SW139 Level 2: Grad Student/Staff SW140 Level 3: Undergrad Student Level 4: External Authorized Signature: (Tony Adamo or Ronald Soong

  18. Understanding the application of Raman spectroscopy to the detection of traces of life

    E-Print Network [OSTI]

    Marshall, Craig P.; Edwards, Howell G.M.; Jehlicka, Jan

    2010-03-01

    Investigating carbonaceous microstructures and material in Earth's oldest sedimentary rocks is an essential part of tracing the origins of life on our planet; furthermore, it is important for developing techniques to search ...

  19. The application of small amplitude square root of time potential pulses in electrochemical trace analysis 

    E-Print Network [OSTI]

    Cranston, Stacy Eugene

    1975-01-01

    THE APPLICATION OF SMALL AMPLITUDE SQUARE BOOT OF TIME POTENTIAL PULSES IN ELECTROCHEMICAL TRACE ANALYSIS A Thesis by STACY EUGENE CRANSTON Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirement... for the degree of MASTER OF SCIENCE December 1975 Ma]or Sub)ect: Chemistry THE APPLICATION OF SMALL AMPLITUDE SQUARE ROOT OF TIME POTENTIAL PULSES IN ELECTROCHEMICAL TRACE ANALYSIS A Thesis STACY EUGENE CRANSTON Approved as to style and content by...

  20. Trace fossils of Fort Hays Limestone Member of Niobrara Chalk (Upper Cretaceous), west-central Kansas

    E-Print Network [OSTI]

    Frey, R. W.

    1970-07-17

    THE UNIVERSITY OF KANSAS PALEONTOLOGICAL CONTRIBUTIONS ARTICLE 53 (CRETACEOUS 2) TRACE FOSSILS OF FORT HAYS LIMESTONE MEMBER OF NIOBRARA CHALK (UPPER CRETACEOUS), WEST-CENTRAL KANSAS ROBERT W. FREY University of Georgia Marine Institute, Sapelo... Figures, 10 Plates, 4 Tables TRACE FOSSILS OF FORT HAYS LIMESTONE MEMBER OF NIOBRARA CHALK (UPPER CRETACEOUS), WEST-CENTRAL KANSAS' ROBERT W. FREY University of Georgia Marine Institute, Sapelo Island, Georgia CONTENTS PAGE PAGE ABSTRACT 5 Thalassinoides...

  1. Trace element emissions. Semi-annual report, October 1994--February 1995

    SciTech Connect (OSTI)

    Pigeaud, A.; Maru, H.; Wilemski, G.; Helble, J.

    1995-02-01

    Many trace elements can exist in raw coal gas either in the form of metallic vapors or gaseous compounds which, besides their action on potentially ``very clean`` advanced power generating systems such as fuel cells and gas turbines, can also be detrimental to plant and animal life when released into the atmosphere. Therefore, volatile trace contaminants from coal which can also be toxic must be removed before they become detrimental to both power plant performance/endurance and the environment. Five trace elements were selected in this project based on: abundance in solid coal, volatility during gasification, effects on downstream systems and toxicity to plant and animal life. An understanding was sought in this investigation of the interactions of these five trace elements (and their high temperature species) with the different components in integrated cleanup and power generating systems, as well as the ultimate effects with respect to atmospheric emissions. Utilizing thermodynamic calculations and various experimental techniques, it was determined that a number of trace contaminants that exist in coal may be substantially removed by flyash, and after that by different sorbent systems. High temperature cleanup of contaminants by sorbents such as zinc titanate, primarily to remove sulfur, can also absorb some metallic contaminants such as cadmium and antimony. Further polishing will be required, however, to eliminate trace contaminant species incorporating the elements arsenic, selemium, lead, and mercury.

  2. The role of high-energy synchrotron radiation in biomedical trace element research

    SciTech Connect (OSTI)

    Pounds, J.G.; Long, G.J.; Kwiatek, W.M.; Jones, K.W.; Gordon, B.M.; Hanson, A.L.

    1987-01-01

    This paper will present the results of an investigation of the distribution of essential elements in the normal hepatic lobule. the liver is the organ responsible for metabolism and storage of most trace elements. Although parenchymal hepatocytes are rather uniform histologically, morphometry, histochemistry, immunohistochemistry, and microdissection with microchemical investigations have revealed marked heterogeneity on a functional and biochemical level. Hepatocytes from the periportal and perivenous zones of the liver parrenchyma differ in oxidative energy metabolism, glucose uptake and output, unreagenesis, biotransformation, bile acid secretion, and palsma protein synthesis and secretion. Although trace elements are intimately involved in the regulation and maintenance of these functions, little is known regarding the heterogeneity of trace element localization of the liver parenchyma. Histochemical techniques for trace elements generally give high spatial resolution, but lack specificity and stoichiometry. Microdissection has been of marginal usefulness for trace element analyses due to the very small size of the dissected parenchyma. The characteristics of the high-energy x-ray microscope provide an effective approach for elucidating the trace element content of these small biological structures or regions. 5 refs., 1 fig., 1 tab.

  3. View dependent fluid dynamics 

    E-Print Network [OSTI]

    Barran, Brian Arthur

    2006-08-16

    physically based rendering method known as photon mapping is used in conjunction with ray tracing to generate realistic images of water with caustics. These methods were implemented as a C++ application framework capable of simulating and rendering fluid in a...

  4. Hierarchical Dynamic Models

    E-Print Network [OSTI]

    Penny, Will

    Hierarchical Dynamic Models Will Penny OU Processes Embedding OU(2) process Dynamic Models Hierarchical Dynamic Models Will Penny 26th May 2011 #12;Hierarchical Dynamic Models Will Penny OU Processes Dynamic Models Will Penny OU Processes Embedding OU(2) process Dynamic Models Generalised coordinates

  5. Influence of contrasting Prosopis/Acacia communities on diet selection and nutrient intake of steers 

    E-Print Network [OSTI]

    Hanson, David Mark

    1987-01-01

    INFLUENCE OF CONTRASTING PROSOPIS/ACACIA COMMUNITIES ON DIET SELECTION AND llUTRIENT INTAKE OF STEERS A Thesis by DAVID MARK HANSON Submitterl 1'e the Graduate College of Texas ARM Danvers i '( '' 1f' f ar'tia1 f. l ' i 1 inert oi the rrnl... Characteristics Diet Characteristics Whole diet Contrasts c v t ~f0 p Diet Com osition Selection Ratio. Morphology of Dietary Frag)nents. Nutrient. Intake. Digestible Organic Matter, Crude Protein. I ecal Output Organic Maiter Intake. Digestible Energy...

  6. GnRH-induced LH release in heifers: effect of nutrient restriction during gestation 

    E-Print Network [OSTI]

    Killen, James Harold

    1983-01-01

    RH-Induced LH Release in Heif era: Effect of Nutrient Restriction During Gestation. (May 1983) James Harold Killen, B. S. , University of Arizona Co-Chairmen of Advisory Committee: Dr. David W. Forrest Dr. Paul G. Harms This study was undertaken.... 4+/-18. 4, 64. 9+/-16. 8, and 29. 6+/-12. 4 ng/ml (P&. 10) for pr spartum heifer s snd 18. 4+/-4. 7, 14. 6+/-S. 4 and 31. 7+/- 5. 7 ng/ml (P&. 10) f or postpartum heifers in the L, M snd G groups, r eepectively. LSM for plasma LH response and peak...

  7. Characterization of the Kootenai River Aquatic Macroinvertebrate Community before and after Experimental Nutrient Addition, 2003-2006. [Chapter 3

    SciTech Connect (OSTI)

    Holderman, Charlie [Kootenai Tribe of Idaho Bonners

    2009-02-19

    The Kootenai River ecosystem has experienced numerous ecological changes since the early 1900s. Some of the largest impacts to habitat, biological communities, and ecological function resulted from levee construction along the 120 km of river upstream from Kootenay Lake, completed by the 1950s, and the construction and operation of Libby Dam, completed in 1972 on the river near Libby Montana. Levee construction isolated tens of thousands of hectares of historic functioning floodplain habitat from the river channel, eliminating nutrient production and habitat diversity crucial to the functioning of a large river-floodplain ecosystem. Libby Dam continues to create large changes in the timing, duration, and magnitude of river flows, and greatly reduces sediment and nutrient transport to downstream river reaches. These changes have contributed to the ecological collapse of the post-development Kootenai River ecosystem and its native biological communities. In response to this artificial loss of nutrients, experimental nutrient addition was initiated in the Kootenay Lake's North Arm in 1992, the South Arm in 2004, and in the Kootenai River at the Idaho-Montana border during 2005. This report characterizes the macroinvertebrate community in the Kootenai River and its response to experimental nutrient addition during 2005 and 2006. This report also provides an initial evaluation of cascading trophic interactions in response to nutrient addition. Macroinvertebrates were sampled at 12 sites along a 325 km section of the Kootenai River, representing an upriver unimpounded reference reach, treatment and control canyon reach sites, and braided and meandering reach sites, all downstream from Libby Dam. Principle component analysis revealed that richness explained the greatest amount of variability in response to nutrient addition as did taxa from Acari, Coleoptera, Ephemeroptera, Plecoptera, and Trichoptera. Analysis of variance revealed that nutrient addition had a significant effect (p<0.0001) on invertebrate abundance, biomass, and richness at sites KR-9 and KR-9.1 combined (the zone of maximum biological response). Richness, a valuable ecological metric, increased more than abundance and biomass, which were subject to greater sampling bias. Cascading trophic interactions were observed as increased algal accrual, increased in-river invertebrate abundance, and increased invertebrate counts in mountain whitefish (Prosopium williamsonii) guts samples, but were not quantitatively tested. Sampling and analyses across trophic levels are currently ongoing and are expected to better characterize ecological responses to experimental nutrient addition in the Kootenai River.

  8. The combined effects of thinning and prescribed fire on carbon and nutrient budgets in a Jeffrey pine forest

    SciTech Connect (OSTI)

    Johnson, Dale W. [University of Nevada, Reno; Murphy, James D. [University of Nevada, Reno; Walker, Roger F. [University of Nevada, Reno; Miller, Watkins W. [University of Nevada, Reno; Glass, D. W. [University of Nevada, Reno; Todd Jr, Donald E [ORNL

    2008-09-01

    Both burning and harvesting cause carbon and nutrient removals from forest ecosystems, but few studies have addressed the combination of these effects. For a Pinus jeffreyii forest in the Sierra Nevada Mountains of California, we posed the question: what are the relative impacts of thinning and subsequent burning on carbon and nutrient removals? The thinning methods included whole-tree thinning (WT, where all aboveground biomass was removed) cut to length (CTL, where branches and foliage were left on site in a slash mat on top of skid trails) and no harvest (CONT). Total C and nutrient exports with thinning and burning were greater in the WT and CTL than in the CONT treatments. Total C and N removals were approximately equal for the WT and CTL treatments, although harvesting dominated exports in the WT treatment and burning dominated exports in the CTL treatment. Total removals of P, K, Ca, Mg and S were greatest in the WT treatments, where harvesting dominated removals. Comparisons of nutrient removals with ecosystem capital and calculations of potential replenishment by atmospheric deposition suggested that N is the nutrient likely to be most depleted by harvesting and burning treatments.

  9. ADVANCED GASIFICATION MERCURY/TRACE METAL CONTROL WITH MONOLITH TRAPS

    SciTech Connect (OSTI)

    Mark A. Musich; Michael L. Swanson; Grant E. Dunham; Joshua J. Stanislowski

    2010-07-31

    Two Corning monoliths and a non-carbon-based material have been identified as potential additives for mercury capture in syngas at temperatures above 400°F and pressure of 600 psig. A new Corning monolith formulation, GR-F1-2189, described as an active sample appeared to be the best monolith tested to date. The Corning SR Liquid monolith concept continues to be a strong candidate for mercury capture. Both monolith types allowed mercury reduction to below 5-?g/m3 (~5 ppb), a current U.S. Department of Energy (DOE) goal for trace metal control. Preparation methods for formulating the SR Liquid monolith impacted the ability of the monolith to capture mercury. The Energy & Environmental Research Center (EERC)-prepared Noncarbon Sorbents 1 and 2 appeared to offer potential for sustained and significant reduction of mercury concentration in the simulated fuel gas. The Noncarbon Sorbent 1 allowed sustained mercury reduction to below 5-?g/m3 (~5 ppb). The non-carbon-based sorbent appeared to offer the potential for regeneration, that is, desorption of mercury by temperature swing (using nitrogen and steam at temperatures above where adsorption takes place). A Corning cordierite monolith treated with a Group IB metal offered limited potential as a mercury sorbent. However, a Corning carbon-based monolith containing prereduced metallic species similar to those found on the noncarbon sorbents did not exhibit significant or sustained mercury reduction. EERC sorbents prepared with Group IB and IIB selenide appeared to have some promise for mercury capture. Unfortunately, these sorbents also released Se, as was evidenced by the measurement of H2Se in the effluent gas. All sorbents tested with arsine or hydrogen selenide, including Corning monoliths and the Group IB and IIB metal-based materials, showed an ability to capture arsine or hydrogen selenide at 400°F and 600 psig. Based on current testing, the noncarbon metal-based sorbents appear to be the most effective arsine and hydrogen selenide sorbents. The noncarbon sorbent was able to reduce the concentration to 0 ppb from a starting concentration of 120 ppb. This compares to the target value of 5 ppb (~17?g/m3). The EERC-prepared metal-based pellet and coprecipitate sorbents exhibited arsine reductions of 90% or greater, being below 10 ppb. Corning SR Liquid monoliths exhibited brief periods (<1 hour) of attaining 90% arsine reduction but were able to achieve greater than 80% reduction for several hours. With respect to hydrogen selenide, all Group IB and IIB metal-based sorbents tested exhibited 100% reduction from an inlet concentration of approximately 400 ppb. Corning SR Liquid monoliths exhibited an 82% reduction when two monoliths were tested simultaneously in series.

  10. Trace element analysis of soil type collected from the Manjung and central Perak

    SciTech Connect (OSTI)

    Azman, Muhammad Azfar Hamzah, Suhaimi; Rahman, Shamsiah Abdul; Elias, Md Suhaimi; Abdullah, Nazaratul Ashifa; Hashim, Azian; Shukor, Shakirah Abd; Kamaruddin, Ahmad Hasnulhadi Che

    2015-04-29

    Trace elements in soils primarily originated from their parent materials. Parents’ material is the underlying geological material that has been undergone different types of chemical weathering and leaching processes. Soil trace elements concentrations may be increases as a result of continuous input from various human activities, including power generation, agriculture, mining and manufacturing. This paper describes the Neutron Activation Analysis (NAA) method used for the determination of trace elements concentrations in part per million (ppm) present in the terrestrial environment soil in Perak. The data may indicate any contamination of trace elements contributed from human activities in the area. The enrichment factors were used to check if there any contamination due to the human activities (power plants, agricultural, mining, etc.) otherwise the values would serve as a baseline data for future study. The samples were collected from 27 locations of different soil series in the area at two different depths: the top soil (0-15cm) and the sub soil (15-30cm). The collected soil samples were air dried at 60°C and passed through 2 µm sieve. Instrumental Neutron Activation Analysis (NAA) has been used for the determination of trace elements. Samples were activated in the Nuclear Malaysia TRIGA Mark II reactor followed by gamma spectrometric analysis. By activating the stable elements in the samples, the elements can be determined from the intensities of gamma energies emitted by the respected radionuclides.

  11. Trace-element geochemistry of coal resource development related to environmental quality and health

    SciTech Connect (OSTI)

    Not Available

    1980-01-01

    This report assesses for decision makers and those involved in coal resource development the environmental and health impacts of trace-element effects arising from significant increases in the use of coal, unless unusual precautions are invoked. Increasing demands for energy and the pressing need for decreased dependence of the United States on imported oil require greater use of coal to meet the nation's energy needs during the next decade. If coal production and consumption are increased at a greatly accelerated rate, concern arises over the release, mobilization, transportation, distribution, and assimilation of certain trace elements, with possible adverse effects on the environment and human health. It is, therefore, important to understand their geochemical pathways from coal and rocks via air, water, and soil to plants, animals, and ultimately humans, and their relation to health and disease. To address this problem, the Panel on Trace Element Geochemistry of Coal Resource Development Related to Health (PECH) was established. Certain assumptions were made by the Panel to highlight the central issues of trace elements and health and to avoid unwarranted duplication of other studies. Based on the charge to the Panel and these assumptions, this report describes the amounts and distribution of trace elements related to the coal source; the various methods of coal extraction, preparation, transportation, and use; and the disposal or recycling of the remaining residues or wastes. The known or projected health effects are discussed at the end of each section.

  12. Reaction dynamics of atomic chlorine with methane: Importance of methane bending and torsional excitation in controlling reactivity

    E-Print Network [OSTI]

    Reaction dynamics of atomic chlorine with methane: Importance of methane bending and torsional with methane vibrationally excited in trace quantities into low-energy bending and torsional modes­7 and detailed the effect on reactivity of C­H stretch vibrational excitation.5­7 This paper concerns our most

  13. Root biomass and nutrient content of a 25-year-old loblolly pine (Pinus Taeda L.) plantation in East Texas 

    E-Print Network [OSTI]

    Tuttle, Charles LaGrone

    1978-01-01

    ROOT BIOMASS AND NUTRIENT CONTENT OF A 25-YEAR-OLD LOBLOLLY PINE (PINUP TAED!l LJ PIJIN ATION IN EAST TEIJIS A Thesis by Charles LaGrone Tuttle Submitted to the Graduate College of Texa s A & M University in partial, fulfillment... of the requirement for the degree of MASTER OF SCIENCE December 1978 iVIajor Subject: Forest S "ience ROOT BIOMASS AND NUTRIENT CONTENT OF A 25-YEAR-OLD LOBLOLLY PINE (PINUS TAEDA L. ) PLANTATION IN EAST TEXAS A Thesis by Charles LaGrone Tuttle Approved...

  14. Determination of trace impurities in uranium hexafluoride using inductively coupled plasma-atomic emission spectroscopy

    SciTech Connect (OSTI)

    Floyd, M.A.; Morrow, R.W.; Lazader, W.B.; Farrar, R.B.; Halouma, A.A.

    1982-06-01

    A procedure has been developed to determine 30 trace elements in high-purity uranium hexafluoride (UF/sub 6/) using inductively coupled plasma-atomic emission spectroscopy. The analytical method consists of a liquid-liquid extraction of the uranium from the trace impurities with a tri-(2-ethyl-hexyl)-phosphate (TEHP)-hexane mixture. A computer-controlled scanning monochromator system interfaced to an inductively coupled plasma (ICP) is then used to determine the levels of 30 trace elements present in the UF/sub 6/. A single sample dissolution procedure is used for all elements investigated. This preliminary report details experimental work done to date as part of a countinuing program to determine metallic impurities in uranium by ICP.

  15. Effects of trace metals on diatom export products from the euphotic zone and significance for biogeochemical cycles

    E-Print Network [OSTI]

    Richter, Daniel J.

    Geological considerations: export products of interest . . 4of production and particulate export in the surface ocean.of trace metals on diatom export products from the euphotic

  16. Oceanic Trace Gases Numeric Data Packages from the Carbon Dioxide Information Analysis Center (CDIAC)

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

    CDIAC products include numeric data packages, publications, trend data, atlases, models, etc. and can be searched for by subject area, keywords, authors, product numbers, time periods, collection sites, spatial references, etc. Most data sets or packages, many with numerous data files, are free to download from CDIAC's ftp area. CDIAC lists the following numeric data packages under the broad heading of Oceanic Trace Gases: Carbon Dioxide, Hydrographic, and Chemical Data Obtained during the R/V Ronald H. Brown Repeat Hydrography Cruise in the Atlantic Ocean: CLIVAR CO2 Section A16S_2005 ( 01/11/05 - 022405) • Determination of Carbon Dioxide, Hydrographic, and Chemical Parameters during the R/V Nathaniel B. Palmer Cruise in the Southern Indian Ocean (WOCE Section S04I, 050396 - 070496) • Inorganic Carbon, Nutrient, and Oxygen Data from the R/V Ronald H. Brown Repeat Hydrography Cruise in the Atlantic Ocean: CLIVAR CO2 Section A16N_2003a (060403 – 081103) • Carbon Dioxide, Hydrographic, and Chemical Data Obtained During the R/V Maurice Ewing Cruise in the Atlantic Ocean (WOCE Section A17, 010494 - 032194) • Global Ocean Data Analysis Project GLODAP: Results and Data • Carbon Dioxide, Hydrographic, and Chemical Data Obtained During the R/V Knorr Cruises in the North Atlantic Ocean on WOCE Sections AR24 (1102 – 120596) and A24, A20, and A22 (053097 – 090397) • Carbon Dioxide, Hydrographic and Chemical Data Obtained During the Nine R/V Knorr Cruises Comprising the Indian Ocean CO2 Survey (WOCE Sections I8SI9S, I9N, I8NI5E, I3, I5WI4, I7N, I1, I10, and I2; 120 194 – 012296) • Carbon Dioxide, Hydrographic, and Chemical Data Obtained During the R/V Meteor Cruise 28/1 in the South Atlantic Ocean (WOCE Section A8, 032994 - 051294) • Carbon Dioxide, Hydrographic, and Chemical Data Obtained During the R/V Knorr Cruise 138-3, -4, and -5 in the South Pacific Ocean (WOCE Sections P6E, P6C, and P6W, 050292 - 073092) • Global Distribution of Total Inorganic Carbon and Total Alkalinity below the deepest winter mixed layer depths • Carbon Dioxide, Hydrographic, and Chemical Data Obtained During the R/V John V. Vickers Cruise in the Pacific Ocean (WOCE Section P13, NOAA CGC92 Cruise, 080492 – 102192) • Carbon Dioxide, Hydrographic, and Chemical Data Obtained During the R/V Hesperides Cruise in the Atlantic Ocean (WOCE Section A5, 071492 - 081592) • Carbon Dioxide, Hydrographic, and Chemical Data Obtained During the R/V Thomas G. Thompson Cruise in the Pacific Ocean (WOCE Section P10, 100593 – 111093) • The International Intercomparison Exercise of Underway fCO2 Systems during the R/V Meteor Cruise 36/1 in the North Atlantic Ocean • Carbon Dioxide, Hydrographic, and Chemical Data Obtained during the R/V Meteor Cruise 22/5 in the South Atlantic Ocean (WOCE Section A10, Dec. 1992-Jan, 1993) • Carbon Dioxide, Hydrographic, and Chemical Data Obtained in the South Pacific Ocean (WOCE Sections P16A/P17A, P17E/P19S, and P19C, R/V Knorr , Oct. 1992-April 1993) • Surface Water and Atmospheric Underway Carbon Data Obtained During the World Ocean Circulation Experiment Indian Ocean Survey Cruises (R/V Knorr, Dec. 1994 – Jan, 1996) • Carbon Dioxide, Hydrographic, and Chemical Data Obtained During the R/V Akademik Ioffe Cruise in the South Pacific Ocean (WOCE Section S4P, Feb.-April 1992) • Carbon Dioxide, Hydrographic, and Chemical Data Obtained During the R/V Thomas Washington Cruise TUNES-1 in the Equatorial Pacific Ocean (WOCE section P17C) • Carbon Dioxide, Hydrographic, and Chemical Data Obtained During the R/V Thomas Washington Cruise TUNES-3 in the Equatorial Pacific Ocean (WOCE section P16C) • Carbon-14 Measurements in Surface Water CO2 from the Atlantic, Indian and Pacific Oceans, 1965-1994 • Carbon Dioxide, Hydrographic, and Chemical Data Obtained During R/V Meteor Cruise 18/1 in the North Atlantic Ocean (WOCE Section A1E) • Carbon Dioxide, Hydrographic, and Chemical Data Obtained in the Central South Pacific Ocean (WOCE Sections P17S and P16S) during the TUNES-2 Expedition of the R/V Th

  17. Sandia Energy - Chemical Dynamics

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

    Chemical Dynamics Home Transportation Energy Predictive Simulation of Engines Combustion Chemistry Chemical Dynamics Chemical DynamicsAshley Otero2015-10-28T02:45:37+00:00...

  18. Trace Anomaly and Dimension Two Gluon Condensate Above the Phase Transition

    SciTech Connect (OSTI)

    Megias,E.; Ruiz Arriola, E.; Salcedo, L.L.

    2008-02-04

    The dimension two gluon condensate has been used previously within a simple phenomenological model to describe power corrections from available lattice data for the renormalized Polyakov loop and the heavy quark-antiquark free energy in the deconfined phase of QCD. The QCD trace anomaly of gluodynamics also shows unequivocal inverse temperature power corrections which may be encoded as dimension two gluon condensate. We analyze lattice data of the trace anomaly and compare with other determinations of the condensate from previous references, yielding roughly similar numerical values.

  19. Runtime Tracing of The Community Earth System Model: Feasibility and Benefits

    SciTech Connect (OSTI)

    Wang, Dali [ORNL] [ORNL; Domke, Jens [ORNL] [ORNL

    2011-01-01

    Community Earth System Models (CESM) is one of US's leading earth system modeling systems, which has over decades of development history and embraced by large, active user communities. In this paper, we first review the history of CESM software development and layout the general objectives of performance analysis. Then we present an offline global community land model simulation within the CESM framework to demonstrate the procedure of runtime tracing of CESM using the Vampir toolset. Finally, we explain the benefits of runtime tracing to the general earth system modeling community. We hope those considerations can also be beneficial to many other modeling research programs involving legacy high-performance computing applications.

  20. The Effects of Trace Contaminants on Catalytic Processing of Biomass-Derived Feedstocks

    SciTech Connect (OSTI)

    Elliott, Douglas C.; Peterson, Keith L.; Muzatko, Danielle S.; Alderson, Eric V.; Hart, Todd R.; Neuenschwander, Gary G.

    2004-03-25

    Trace components in biomass feedstocks are potential catalyst poisons when catalytically processing these materials to value-added chemical products. Trace components include inorganic elements such as alkali metals and alkaline earths, phosphorus or sulfur, aluminum or silicon, chloride, or transition metals. Protein components in biomass feedstocks can lead to formation of peptide fractions (from hydrolysis) or ammonium ions (from more severe breakdown) both of which might interfere with catalysis. The effects of these components on catalytic hydrogenation processing has been studied in batch reactor processing tests

  1. Atmospheric Trace Gases from the Carbon Dioxide Information Analysis Center (CDIAC)

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

    CDIAC products are indexed and searchable through a customized interface powered by ORNL's Mercury search engine. Products include numeric data packages, publications, trend data, atlases, models, etc. and can be searched for by subject area, keywords, authors, product numbers, time periods, collection sites, spatial references, etc. Some of the collections may also be included in the CDIAC publication, Trends Online: A Compendium of Global Change Data. Most data sets, many with numerous data files, are free to download from CDIAC's ftp area. The collections under the CDIAC heading of Atmospheric Trace Gases include: Atmospheric Carbon Dioxide, Atmospheric Methane, Atmospheric Carbon Monoxide, Atmospheric Hydrogen, Isotopes in Greenhouse Gases, Radionuclides, Aerosols, and Other Trace Gases.

  2. Batch methods for enriching trace impurities in hydrogen gas for their further analysis

    DOE Patents [OSTI]

    Ahmed, Shabbir; Lee, Sheldon H.D.; Kumar, Romesh; Papdias, Dionissios D.

    2014-07-15

    Provided herein are batch methods and devices for enriching trace quantities of impurities in gaseous mixtures, such as hydrogen fuel. The methods and devices rely on concentrating impurities using hydrogen transport membranes wherein the time period for concentrating the sample is calculated on the basis of optimized membrane characteristics, comprising its thickness and permeance, with optimization of temperature, and wherein the enrichment of trace impurities is proportional to the pressure ratio P.sub.hi/P.sub.lo and the volume ratio V.sub.1/V.sub.2, with following detection of the impurities using commonly-available detection methods.

  3. Double-Trace Deformations and Entanglement Entropy in AdS

    E-Print Network [OSTI]

    Taiki Miyagawa; Noburo Shiba; Tadashi Takayanagi

    2015-11-30

    We compute the bulk entanglement entropy of a massive scalar field in a Poincare AdS with the Dirichlet and Neumann boundary condition when we trace out a half space. Moreover, by taking into account the quantum back reaction to the minimal surface area, we calculate how much the entanglement entropy changes under a double-trace deformation of a holographic CFT. In the AdS3/CFT2 setup, our result agrees with the known result in 2d CFTs. In higher dimensions, our results offer holographic predictions.

  4. Influence of rainfall on the retention of sludge trace metals by the leaves of forage crops 

    E-Print Network [OSTI]

    Jones, Stephen Grady

    1977-01-01

    INFLUENCE OF RAINFALL ON THE RETENTION OF SLUDGE TRACE METALS BY THE LEAVES OF FORAGE CROPS A Thesis STEPHEN GRADY JONES Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirement for the degree... of MASTER OF SCIENCE December 1977 Major Subject: Soil Science INFLUENCE OF RAINFALL ON THE RETENTION OF SLUDGE TRACE MFTALS BY THE LEAVES OF FORAGE CROPS A Thesis by STEPHEN GRADY JONES Approved a to style and content by: 1 (Chairman of Committee...

  5. Trace fossils and depositional environment of four clastic units, Upper Pennsylvanian megacyclothems, northeast Kansas

    E-Print Network [OSTI]

    Hakes, W. G.

    1976-04-29

    and bryozoans in the upper two meters (Ball et al., 1963, p. 36). The Stull Shale has been described in Douglas County to contain one or more thin coal beds and a sparse molluscan fauna, found south of the Wakarusa River (O'Connor, 1960, p. 42). Farther north... fossil horizons at the same locality desig- nated by a and b. Refer to Table 5. Geographic location of section in Fig. 4. For lithologie symbols see Fig. 5. 1 DISCUSSION BATHYMETRY OF TRACE FOSSILS Seilacher (1967) divided characteristic trace fossil as...

  6. Kootenai River Nutrient Dosing System and N-P Consumption: Year 2008.

    SciTech Connect (OSTI)

    Holderman, Charles

    2009-02-19

    In early 2006 we designed and built low energy consumption, pump-operated system, for dosing of the liquid nutrient in the summer 2006 season. This operated successfully, and the system was used again during the 2007 and 2008 seasons for dosing. During the early winter period, 2008, laboratory tests were made of the liquid nutrient pump system, and it was noted that small amounts of air were being entrained on the suction side of the pump, during conditions when the inlet pressure was low. It was believed that this was the cause of diurnal fluctuations in the flow supplied, characteristic of the 2007 year flow data. Replacement of '0' rings on the inlet side of the pumps was the solution to this problem, and when tested in the field during the summer season, the flow supplied was found to be stable. A decision was made by the IKERT committee at the meeting of 20th to 21st May 2008 (held in Coeur d'Alene, Idaho) to use an injection flow rate of liquid fertilizer (polyammonium phosphate 10-34-0) to achieve a target phosphorus concentration of 3.0 {micro}g/L, after complete mixing in the river. This target concentration was the same as that used in 2006 and 2007. The proposed starting date was as early as possible in June 2008. Plans were made to measure the dosing flow in three ways. Two of the three methods of flow measurement (1 and 2 below) are inter-dependent. These were: (1) Direct measurement of flow rate by diverting dosing flow into a 1000 mL volume standard flask. The flow rate was computed by dividing the flask volume by the time required to fill the flask. This was done a few times only during the summer period. (2) Adjusting the flow rate reading of the Gamma dosing pump using the 'calibration' function to achieve agreement with the flow rate computed by method 1 above. (3) Direct measurement by electrical signal from conductive fluid passing through a magnetic field (Seametrics meter, as used in previous years). Values were recorded every 4 minutes by a data-logger. This instrument has been shown to be reliable, and in agreement with method 1 to within the expected uncertainty (within 2%). Liquid nutrients were delivered to the site in late May, and system testing was done the same day. High concentrations of suspended sediment in the water column, as indicated by shallow Secchi depth readings, were present in the river in the last part of May, into June. A plan was made to delay the start up of nutrient addition to a date later than 1st June, because the aquatic productivity was almost certainly to be compromised by insufficient light availability. Daily monitoring of Secchi depths was done, showing declining turbidity in early June. A decision was made to start the system on 15th June, by which time conditions were good.

  7. 17 Koerselman, W. and Meuleman, A.F.M.The vegetation N:Pratio: a new tool to detect the nature of nutrient limitation, J.App!. Ecol.

    E-Print Network [OSTI]

    Kohn, Joshua R.

    Koerselman, W. (1992)The nature of nutrient limitation in Dutch dune slacks, in Coastal Dunes: GeomorphologyR E VIE WS 17 Koerselman, W. and Meuleman, A.F.M.The vegetation N:Pratio: a new tool to detect.G.M.and De Swart, E.O.A.M. (1994)Nutrientconcentrations in mire vegetation as a measure of nutrient

  8. Control of nutrient pollution to U.S. waterways is an urgent issue for the nation. In 2013, the U.S. Environmental Protection Agency

    E-Print Network [OSTI]

    Connors, Daniel A.

    sustainable solutions for reduction of nutrient pollution in the nation's water resources. The CLEAN CENTER The physical system The people and policy Decision making tools Wastewater Treatment Technologies Water ReuseControl of nutrient pollution to U.S. waterways is an urgent issue for the nation. In 2013, the U

  9. Impacts of mechanical site preparation on foliar nutrients of planted white spruce seedlings on mixed-wood

    E-Print Network [OSTI]

    Macdonald, Ellen

    Impacts of mechanical site preparation on foliar nutrients of planted white spruce seedlings Abstract The impacts of different methods of mechanical site preparation (MSP) on performance and foliar, moisture, root growth, and mycorrhizal relationships. Mechanical site preparation (MSP) is a widely

  10. DIVISION S-10--WETLAND SOILS Turnover of Detrital Organic Carbon in a Nutrient-Impacted Everglades Marsh

    E-Print Network [OSTI]

    Florida, University of

    of organic C in plant and soil detrital pools along a P enrichment gradient in an Everglades marsh-30 cmdepth)], potential C mineralization decreased down gradient from the source of nutrient loading to WCA-2 metabolism via denitrification, as well as through NH3 volatilization (Reddy and D'Angelo, 1994). In contrast

  11. The influence of specific stressors, such as nutrient enrichment and physical habitat degradation, on biotic integrity requires

    E-Print Network [OSTI]

    David, Mark B.

    ., 2000), yet some researchers have found that nutrients have the largest effect on stream organisms (e and stability and decreased organic matter retention have historically been identified as major det- rimental have been linked to poor biotic integrity in streams (Miltner and Rankin, 1998), and the mechanism

  12. Nutrient utilization ratios in the Polar Frontal Zone in the Australian sector of the Southern Ocean: A model

    E-Print Network [OSTI]

    Wang, Wendy

    Nutrient utilization ratios in the Polar Frontal Zone in the Australian sector of the Southern. The best model fit to the observations required an annual N/P utilization ratio of 13.2, but this low N/P ratio still overestimated the nitrate utilization during the summer. We considered three mechanisms

  13. NITRATE UTILIZATION BY PHYTOPLANKTON IN LAKE SUPERIOR IS IMPAIRED BY LOW NUTRIENT (P, Fe) AVAILABILITY AND SEASONAL LIGHT LIMITATION--

    E-Print Network [OSTI]

    Sterner, Robert W.

    NITRATE UTILIZATION BY PHYTOPLANKTON IN LAKE SUPERIOR IS IMPAIRED BY LOW NUTRIENT (P, Fe utilization in this oligotrophic system. Clean sampling methods were used to collect water from Lake Superior during spring and summer 2004, and nitrate utilization was measured by monitoring bioreporter

  14. Microbial Grazing Lab The microbial loop is responsible for the cycling of nutrients as well as the support of higher

    E-Print Network [OSTI]

    Vallino, Joseph J.

    Microbial Grazing Lab The microbial loop is responsible for the cycling of nutrients as well) and nanoplankton (eg. Flagellates 2-20 m) grazing of picoplankton (eg. Bacteria 0.2-2 m) provide the flow of energy and mass to higher trophic levels via the postulated microbial loop. In order to determine the grazing

  15. &p.1:Abstract We conducted an experimental study of the effects of nutrient addition on the susceptibility of two

    E-Print Network [OSTI]

    Orians, Colin

    on the susceptibility of two species of willows (Salix eriocephala and S. sericea) and their hybrid to a pathogen plant susceptibility · Hybrid performance · Logit modeling · Salix spp. · Soil nutrient heterogeneity; Christensen et al. 1995). Two common willows of eastern North America, Salix eriocephala and S. sericea

  16. Nutrient Crib Sheet (C) R.G. Smith (robretina.anatomy.upenn.edu) Please distribute freely. Feb, 2013

    E-Print Network [OSTI]

    Smith, Robert G.

    caused by nutrient deficiencies. By eating right, we can prevent common causes of heart disease. These nutritional deficiencies are the cause of much illness and suffering, but are easy to correct, because allergy and asthma. It is essential for most of the body's biochemical and protective processes, to hold

  17. Dynamic Patterns of Academic Forum Activities

    E-Print Network [OSTI]

    Zhao, Zhi-Dan; Cai, Shi-Min; Zhou, Tao

    2015-01-01

    A mass of traces of human activities show rich dynamic patterns. In this article, we comprehensively investigate the dynamic patterns of 50 thousands of researchers' activities in Sciencenet, the largest multi-disciplinary academic community in China. Through statistical analyses, we found that (i) there exists a power-law scaling between the frequency of visits to an academic forum and the number of corresponding visitors, with the exponent being about 1.33; (ii) the expansion process of academic forums obeys the Heaps' law, namely the number of distinct visited forums to the number of visits grows in a power-law form with exponent being about 0.54; (iii) the probability distributions of time interval and the number of visits taken to revisit the same academic forum both follow power-laws, indicating the existence of memory effect in academic forum activities. On the basis of these empirical results, we propose a dynamic model that incorporates the exploration, preferential return and memory effect, which ca...

  18. Heat flux dynamics in dissipative cascaded systems

    E-Print Network [OSTI]

    Salvatore Lorenzo; Alessandro Farace; Francesco Ciccarello; G. Massimo Palma; Vittorio Giovannetti

    2015-03-24

    We study the dynamics of heat flux in the thermalization process of a pair of identical quantum system that interact dissipatively with a reservoir in a {\\it cascaded} fashion. Despite the open dynamics of the bipartite system S is globally Lindbladian, one of the subsystems "sees" the reservoir in a state modified by the interaction with the other subsystem and hence it undergoes a non-Markovian dynamics. As a consequence, the heat flow exhibits a non-exponential time behaviour which can greatly deviate from the case where each party is independently coupled to the reservoir. We investigate both thermal and correlated initial states of $S$ and show that the presence of correlations at the beginning can considerably affect the heat flux rate. We carry out our study in two paradigmatic cases -- a pair of harmonic oscillators with a reservoir of bosonic modes and two qubits with a reservoir of fermionic modes -- and compare the corresponding behaviours. In the case of qubits and for initial thermal states, we find that the trace distance discord is at any time interpretable as the correlated contribution to the total heat flux.

  19. Measurements of trace element concentration profiles across the diameter of human hair with micro-pixe

    SciTech Connect (OSTI)

    Bos, A.J.J.; C.C.A.H.v.d. Stap.; Lenglet, W.J.M.; Valkovic, V.; Vis, R.D.

    1983-04-01

    Trace element distributions across single human hairs using a proton microbeam has been measured to study the origin of these elements in hair. A new way of concentration assignment for micro PIXE making use of both the Proton Induced characteristic X-rays and the Rutherford Backscattered protons is reported.

  20. Exploiting Collisions in Addition Chain-based Exponentiation Algorithms Using a Single Trace

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    Exploiting Collisions in Addition Chain-based Exponentiation Algorithms Using a Single Trace Neil. Public key cryptographic algorithms are typically based on group exponentiation algorithms where of the input to the exponentiation algorithm. These attacks would therefore be applicable to algorithms

  1. San Francisco Estuary Regional Monitoring Program for Trace Substances A Review of Urban Runoff Processes

    E-Print Network [OSTI]

    San Francisco Estuary Regional Monitoring Program for Trace Substances A Review of Urban RunoffKee Jon Leatherbarrow Sarah Pearce Jay Davis SFEI Contribution 66 September 2003 San Francisco Estuary Institute #12;A Review of Urban Runoff Processes in the San Francisco Bay Area: Existing knowledge

  2. San Francisco Estuary Regional Monitoring Program for Trace Substances SFEI Contribution 115

    E-Print Network [OSTI]

    San Francisco Estuary Regional Monitoring Program for Trace Substances SFEI Contribution 115 August 2004 San Francisco Estuary Institute A Simple Mass Balance Model for PAH Fate in the San Francisco Estuary Ben K. Greenfield Jay A. Davis #12;PAH fate in the San Francisco Estuary San Francisco Estuary

  3. San Francisco Estuary Regional Monitoring Program for Trace Substances Conceptual Framework and Rationale

    E-Print Network [OSTI]

    San Francisco Estuary Regional Monitoring Program for Trace Substances Conceptual Framework Anderson SFEI Contribution 317 November 2004 San Francisco Estuary Institute #12;Page 1 San Francisco Anderson San Francisco Estuary Institute, Oakland, CA SFEI Contribution #317 November, 2004 #12;Page 2

  4. San Francisco Estuary Regional Monitoring Program for Trace Substances Identification and Evaluation of

    E-Print Network [OSTI]

    San Francisco Estuary Regional Monitoring Program for Trace Substances Identification and Evaluation of Unidentified Organic Contaminants in the San Francisco Estuary Daniel R. Oros Nicole David SFEI Contribution 45 August 2002 San Francisco Estuary Institute #12;San Francisco Estuary Regional Monitoring

  5. San Francisco Estuary Regional Monitoring Program for Trace Substances Estimates of Suspended-sediment Flux

    E-Print Network [OSTI]

    San Francisco Estuary Regional Monitoring Program for Trace Substances Estimates of Suspended-sediment Flux Entering San Francisco Bay from the Sacramento and San Joaquin Delta Lester McKee Neil Ganju David Schoellhamer Jay Davis Don Yee Jon Leatherbarrow Rainer Hoenicke SFEI Contribution 65 December 2002 San

  6. EnergyBox: A Trace-driven Tool for Data Transmission Energy Consumption Studies

    E-Print Network [OSTI]

    .vergara, simin.nadjm-tehrani}@liu.se Abstract. Although evolving mobile technologies bring millions of users closer to the vision of information anywhere-anytime, device battery de- pletions hamper the quality-dependent laborious physical power measurements. Using real application transmission traces, we have validated Energy

  7. Rapid chain tracing of polypeptide backbones in electron-density maps

    SciTech Connect (OSTI)

    Terwilliger, Thomas C., E-mail: terwilliger@lanl.gov [Los Alamos National Laboratory, Los Alamos, NM 87545 (United States)

    2010-03-01

    A method for rapid chain tracing of polypeptide backbones at moderate resolution is presented. A method for the rapid tracing of polypeptide backbones has been developed. The method creates an approximate chain tracing that is useful for visual evaluation of whether a structure has been solved and for use in scoring the quality of electron-density maps. The essence of the method is to (i) sample candidate C{sup ?} positions at spacings of approximately 0.6 Å along ridgelines of high electron density, (ii) list all possible nonapeptides that satisfy simple geometric and density criteria using these candidate C{sup ?} positions, (iii) score the nonapeptides and choose the highest scoring ones, and (iv) find the longest chains that can be made by connecting nonamers. An indexing and storage scheme that allows a single calculation of most distances and density values is used to speed up the process. The method was applied to 42 density-modified electron-density maps at resolutions from 1.5 to 3.8 Å. A total of 21 428 residues in these maps were traced in 24 CPU min with an overall r.m.s.d. of 1.61 Å for C{sup ?} atoms compared with the known refined structures. The method appears to be suitable for rapid evaluation of electron-density map quality.

  8. LCTES'04, pages 95 --106, 2004 A Trace-based Binary Compilation Framework for

    E-Print Network [OSTI]

    Xue, Jingling

    the effects of individual optimisations on power and energy usage. There has been relatively little workLCTES'04, pages 95 -- 106, 2004 A Trace-based Binary Compilation Framework for Energy-Aware Computing Lian Li and Jingling Xue Compiler Research Group School of Computer Science and Engineering

  9. Evolution of the geothermal fluids at Los Azufres, Mexico, as traced by noble gas isotopes, 18

    E-Print Network [OSTI]

    Evolution of the geothermal fluids at Los Azufres, Mexico, as traced by noble gas isotopes, 18 O, D: Noble gases Strontium isotopes Helium isotopes Geothermal energy Los Azufres Araró Mexico Isotopes of noble gases, CO2, H2O and Sr were measured in 10 geothermal wells and 8 hot springs, fumaroles and mud

  10. Automated Neurovascular Tracing and Analysis of the Knife-Edge Scanning Microscope India Ink Data Set 

    E-Print Network [OSTI]

    Yang, Wenjie

    2014-10-30

    the large volume of data. To solve these issues, a novel automated neurovascular tracing and data analysis method with less processing time and high accuracy is developed in this thesis. First, an automated seed point selection algorithm was described in my...

  11. Ray tracing computations in the smoothed SEG/EAGE Salt Model

    E-Print Network [OSTI]

    Cerveny, Vlastislav

    Ray tracing computations in the smoothed SEG/EAGE Salt Model V#19;aclav Bucha Department to compute rays and synthetic seismograms of refracted and re ected P-waves in the smoothed SEG/EAGE Salt The original 3-D SEG/EAGE Salt Model (Aminzadeh et al. 1997) is very complex model and cannot be used for ray

  12. Ray tracing in the smoothed acoustic SEG/EAGE Salt Model.

    E-Print Network [OSTI]

    Cerveny, Vlastislav

    Ray tracing in the smoothed acoustic SEG/EAGE Salt Model. Part 2: Maps of re ections V#19;aclav of the P-wave re ected from the at bottom interface in the smoothed acoustic SEG/EAGE Salt Model. The illumination of the large shadow area below the trunk of the salt body is discussed. Keywords Velocity model

  13. TorScan: Tracing Long-lived Connections and Differential Scanning Attacks

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    successor of the original Onion Routing Project. The Tor network is a low-latency anonymity network whichTorScan: Tracing Long-lived Connections and Differential Scanning Attacks Alex Biryukov, Ivan Pustogarov, Ralf-Philipp Weinmann University of Luxembourg Abstract. Tor is a widely used anonymity network

  14. Room-temperature mid-infrared laser sensor for trace gas detection

    E-Print Network [OSTI]

    important atmospheric trace gases such as nitric oxide NO , carbon monoxide CO , nitrous ox- ide N2O , formaldehyde H2CO , methane CH4 , and sulfur dioxide SO2 . Applications that require such measurements include- bines high-speed, high-precision, remote sensing capabilities and convenient access to wavelengths

  15. An atom trap trace analysis system for measuring krypton contamination in xenon dark matter detectors

    E-Print Network [OSTI]

    Zelevinsky, Tanya

    An atom trap trace analysis system for measuring krypton contamination in xenon dark matter contamination in xenon dark matter detectors E. Aprile, T. Yoon,a) A. Loose, L. W. Goetzke, and T. Zelevinsky have similar laser cooling wavelengths, the apparatus has been tested with Ar to avoid contamination

  16. An atom trap trace analysis (ATTA) system for measuring ultra-low contamination by krypton in

    E-Print Network [OSTI]

    Zelevinsky, Tanya

    An atom trap trace analysis (ATTA) system for measuring ultra-low contamination by krypton in xenon ultra-low contamination by krypton in xenon dark matter detectors Tae Hyun Yoon The XENON dark matter of the experiment. In order to achieve the desired sensitivity, the contamination by krypton is reduced to the part

  17. ACT: Attachment Chain Tracing Scheme for Email Virus Detection and Control

    E-Print Network [OSTI]

    Paxson, Vern

    of viruses. We propose a progressive immunization strategy which uses transmission chain infor- mation, Algorithms Keywords worm defense, transmission chain, contact tracing 1. INTRODUCTION Today's society depends, 2004, Washington, DC, USA. Copyright 2004 ACM 1-58113-970-5/04/0010 ...$5.00. of information. Computer

  18. TraCE -TRANSPORTATION CENTER EPFL 09 Sep 2009 sonia.lavadinho@epfl.ch STRC Ascona

    E-Print Network [OSTI]

    Bierlaire, Michel

    & capillary walking (TUBE & WALK LONDON) #12;TraCE - TRANSPORTATION CENTER EPFL 09 Sep 2009 soniaTraCE - TRANSPORTATION CENTER EPFL 09 Sep 2009 sonia.lavadinho@epfl.ch STRC Ascona 11 Potentials for combining walking and public transport at the agglomeration scale THE MULTIMODAL WALKER #12;Tra

  19. Trace metal remobilization following the resuspension of estuarine sediments: Saguenay Fjord, Canada

    E-Print Network [OSTI]

    Long, Bernard

    Trace metal remobilization following the resuspension of estuarine sediments: Saguenay Fjord to the resuspension of the Fjord sediments, their exposure to an oxidising environment, and the remobilization the resuspension experiments re¯ect the reactivity of the carrier phases and the competing kinetics of the release

  20. Trace-Based Analysis and Prediction of Cloud Computing User Behavior Using the Fractal Modeling Technique

    E-Print Network [OSTI]

    Pedram, Massoud

    Trace-Based Analysis and Prediction of Cloud Computing User Behavior Using the Fractal Modeling and technology. In this paper, we investigate the characteristics of the cloud computing requests received the alpha- stable distribution. Keywords- cloud computing; alpha-stable distribution; fractional order

  1. Chemical and isotopic analysis of hydrocarbon gas at trace levels Methodology and results

    E-Print Network [OSTI]

    Chappellaz, Jérôme

    -C-IRMS) permits measurement of relative proportions of gaseous hydrocarbon (CH4 to C4H10) and CO2 of hydrocarbons (from 1 ppm to 1000 ppm), accurate measurement of isotope ratios is often impossible dueChemical and isotopic analysis of hydrocarbon gas at trace levels Methodology and results Yvon

  2. Solar Energy 74 (2003) 157173 Comparison between ray-tracing simulations and bi-directional

    E-Print Network [OSTI]

    2003-01-01

    Solar Energy 74 (2003) 157­173 Comparison between ray-tracing simulations and bi-Louis Scartezzini a Solar Energy and Building Physics Laboratory LESO-PB, Swiss Federal Institute of Technology EPFL Cyclotron Road, MS 2-300, Berkeley, CA 94720-8134, USA Abstract Evaluation of solar heat gain and daylight

  3. Export of Asian pollution during two cold front episodes of the TRACE-P experiment

    E-Print Network [OSTI]

    Palmer, Paul

    Export of Asian pollution during two cold front episodes of the TRACE-P experiment C. Mari how these cyclonic systems have impacted the export of pollution out of the Asian continent. We of pollution are met during flight 13 (i.e., the occurrences of the warm conveyor belt near the source regions

  4. Evaluating Trace Cache Energy Efficiency MICHELE CO, DEE A. B. WEIKLE, and KEVIN SKADRON

    E-Print Network [OSTI]

    Huang, Wei

    Evaluating Trace Cache Energy Efficiency MICHELE CO, DEE A. B. WEIKLE, and KEVIN SKADRON University of Virginia Future fetch engines need to be energy efficient. Much research has focused on improving fetch of basic blocks translates to significant energy-efficiency gains. We compare proces- sor performance

  5. TRACE/PARCS Core Modeling of a BWR/5 for Accident Analysis of ATWS Events

    SciTech Connect (OSTI)

    Cuadra A.; Baek J.; Cheng, L.; Aronson, A.; Diamond, D.; Yarsky, P.

    2013-11-10

    The TRACE/PARCS computational package [1, 2] isdesigned to be applicable to the analysis of light water reactor operational transients and accidents where the coupling between the neutron kinetics (PARCS) and the thermal-hydraulics and thermal-mechanics (TRACE) is important. TRACE/PARCS has been assessed for itsapplicability to anticipated transients without scram(ATWS) [3]. The challenge, addressed in this study, is to develop a sufficiently rigorous input model that would be acceptable for use in ATWS analysis. Two types of ATWS events were of interest, a turbine trip and a closure of main steam isolation valves (MSIVs). In the first type, initiated by turbine trip, the concern is that the core will become unstable and large power oscillations will occur. In the second type,initiated by MSIV closure,, the concern is the amount of energy being placed into containment and the resulting emergency depressurization. Two separate TRACE/PARCS models of a BWR/5 were developed to analyze these ATWS events at MELLLA+ (maximum extended load line limit plus)operating conditions. One model [4] was used for analysis of ATWS events leading to instability (ATWS-I);the other [5] for ATWS events leading to emergency depressurization (ATWS-ED). Both models included a large portion of the nuclear steam supply system and controls, and a detailed core model, presented henceforth.

  6. Trace metal uptake and accumulation pathways in Kemp's ridley sea turtles (Lepidochelys kempii) 

    E-Print Network [OSTI]

    Wang, Hui-Chen

    2005-08-29

    , Cr, Cu, Hg, Pb and Zn ?? in the blood and carapace tissue of captive Kemp??s ridleys for use in assessing levels of these metals in wild counterparts. Concentrations of same trace metals were characterized in post-pelagic through adult life stages...

  7. The University of Arizona College of Agriculture and Life Sciences12 Trace Minerals for Cattle

    E-Print Network [OSTI]

    Guerriero, Vince

    The University of Arizona College of Agriculture and Life Sciences12 Trace Minerals for Cattle that Arizona cattle held in feedlots seem to contract more diseases. Some scientists linked the increases extension agent, led the research team that learned not only how cattle health is affected when their diet

  8. Awareness Predicts the Magnitude of Single-Cue Trace Eyeblink Conditioning

    E-Print Network [OSTI]

    Squire, Larry R.

    conditioned response; CR). In delay eyeblink conditioning, the tone remains on until the air puff has beenAwareness Predicts the Magnitude of Single-Cue Trace Eyeblink Conditioning Joseph R. Manns1 Robert conditioning (CS and CS- ) have demonstrated that successful conditioning requires awareness of the stimulus

  9. A compositional trace semantics for Orc Dimitrios Vardoulakis and Mitchell Wand

    E-Print Network [OSTI]

    Strickland, Stevie

    A compositional trace semantics for Orc Dimitrios Vardoulakis and Mitchell Wand Northeastern University dimvar@ccs.neu.edu wand@ccs.neu.edu Abstract. Orc [9] is a language for task orchestration. It has binding, and proving an adequacy theorem to relate them. Also, we investigate strong bisimulation in Orc

  10. A compositional trace semantics for Orc Dimitrios Vardoulakis and Mitchell Wand

    E-Print Network [OSTI]

    Tobin-Hochstadt, Sam

    A compositional trace semantics for Orc Dimitrios Vardoulakis and Mitchell Wand Northeastern University dimvar@ccs.neu.edu wand@ccs.neu.edu Abstract. Orc [9] is a language for task orchestration. It has validates some useful equivalences between Orc processes; since the se- mantics is compositional

  11. A compositional trace semantics for Orc Dimitrios Vardoulakis and Mitchell Wand

    E-Print Network [OSTI]

    Strickland, Stevie

    A compositional trace semantics for Orc Dimitrios Vardoulakis and Mitchell Wand Northeastern University dimvar@ccs.neu.edu wand@ccs.neu.edu Abstract. Orc [6] is a language for task orchestration. It has treatment of variable binding, and proving an adequacy theorem to relate them. 1 Introduction Orc [6

  12. TRACER: A Trace Replay Tool to Evaluate Energy-Efficiency of Mass Storage Systems

    E-Print Network [OSTI]

    Qin, Xiao

    TRACER: A Trace Replay Tool to Evaluate Energy-Efficiency of Mass Storage Systems Zhuo Liu1 , Fei for Optoelectronics 1 Key Laboratory of Data Storage Systems,Ministry of Education of China 1 School of Computer Sci://www.eng.auburn.edu/xqin * Corresponding Author: wufei@hust.edu.cn Abstract--Improving energy efficiency of mass storage systems has become

  13. Trace metal concentration in blood of the Kemp's ridley sea turtle (Lepidochelys kempii) 

    E-Print Network [OSTI]

    Orvik, Lisa Marie

    1997-01-01

    characterized the level of five trace metals in Kemp's ridleys and compared these levels in headstart and wild cohorts as well as between the sexes. Overall, copper, lead, mercury, silver and zinc levels in the blood of Kemp's ridleys were: copper (range = 215...

  14. The trace on the K-theory of group C* -algebras Thomas Schick*

    E-Print Network [OSTI]

    Schick, Thomas

    The trace on the K-theory of group C* -algebras Thomas Schick to a homomorphism trG:K0(C*rG) ! R. ___________________________* e-mail: thomas.schick Thomas Schick If G is torsion free, we have the commutative diagram K0(BG

  15. Stray light calculation methods with optical ray trace software Gary L. Peterson

    E-Print Network [OSTI]

    Bechtold, Jill

    Stray light calculation methods with optical ray trace software Gary L. Peterson Breault Research print or electronic copies for personal use only are allowed. Systematic or multiple reproduction, better, and cheaper computers make it seem as if any optical calculation can be performed. However

  16. Statistical analysis of aerosol species, trace gasses, and meteorology in Chicago

    E-Print Network [OSTI]

    O'Brien, Timothy E.

    ) and principal component analysis (PCA) were applied to atmospheric aerosol and trace gas concentrations and Schmeling 2006, 2007; Shen et al. 2009). The composition of aerosols is region-specific and encompasses inorganic and organic species of natural and anthropogenic ori- gin, present due to primary emission

  17. Direct Painting Software for Tracing on 3D Brain Surfaces with Global Conformal Parameterization

    E-Print Network [OSTI]

    Thompson, Paul

    Direct Painting Software for Tracing on 3D Brain Surfaces with Global Conformal Parameterization-resolution models proves difficult, and often requires expensive visualization or animation software. We therefore developed a convenient software toolkit that enables users to draw curves and label surface subregions

  18. Beryllium and Other Trace Elements in Paragneisses and Anatectic Veins of the

    E-Print Network [OSTI]

    Sandiford, Mike

    Beryllium and Other Trace Elements in Paragneisses and Anatectic Veins of the Ultrahigh-bearing paragneisses. KEY WORDS: Antarctica; beryllium; granulite facies; microprobe; sapphirine INTRODUCTION Beryllium in granitic pegmatites where beryllium minerals, most com- monly beryl, are found (e.g. London & Evensen, 2002

  19. Trace-element evidence for the origin of desert varnish by direct aqueous atmospheric deposition

    E-Print Network [OSTI]

    Lee, Cin-Ty Aeolus

    , Ni, Pb and the rare-earth elements (REEs). In particular, they have anomalously high Ce/La and low Y Nivedita Thiagarajan, Cin-Ty Aeolus Lee* Department of Earth Science, MS-126, Rice University, Houston, TX elemental fractionations. One remaining possibility is that the Fe, Mn and trace metals in varnish

  20. ON THE ECONOMIC PAYOFF OF FORENSIC SYSTEMS WHEN USED TO TRACE COUNTERFEITED SOFTWARE AND

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    ON THE ECONOMIC PAYOFF OF FORENSIC SYSTEMS WHEN USED TO TRACE COUNTERFEITED SOFTWARE AND CONTENT the scope of this paper to the economic e¤ects of forensic systems on counterfeiting. Enforcement mechanisms and phrases. Counterfeiting, Piracy, forensics, economics. 1 #12;2 YACOV YACOBI magnitude of the whole theft

  1. Nuclear and Trace Ideals in Tensored \\LambdaCategories Samson Abramsky \\Lambda

    E-Print Network [OSTI]

    Blute, Richard

    Nuclear and Trace Ideals in Tensored \\Lambda­Categories Samson Abramsky \\Lambda Department of his 60th birthday. Abstract We generalize the notion of nuclear maps from functional analysis by defining nuclear ideals in tensored \\Lambda­categories. The motivation for this study came from attempts

  2. Nuclear and Trace Ideals in Tensored \\LambdaCategories Samson Abramsky \\Lambda

    E-Print Network [OSTI]

    Abramsky, Samson

    Nuclear and Trace Ideals in Tensored \\Lambda­Categories Samson Abramsky \\Lambda Department 60th birthday. Abstract We generalize the notion of nuclear maps from functional analysis by defining nuclear ideals in tensored \\Lambda­categories. The motivation for this study came from attempts

  3. Trace Elements in Tree Rings: Evidence of Recent and Historical Air Pollution

    E-Print Network [OSTI]

    Baes, Fred

    Trace Elements in Tree Rings: Evidence of Recent and Historical Air Pollution C. F. Baes III and S and Historical Air Pollution Abstract. Annual growth rinks from short-leaf pine trees in the Great Smoky years, a period when regional fossil fuel combustion emissions increased about 200 percent. Metals

  4. Evolution of the geothermal fluids at Los Azufres, Mexico, as traced by noble gas isotopes, 18

    E-Print Network [OSTI]

    Long, Bernard

    following over 25 years of geothermal fluid exploitation. Mantle helium dominates in fluids from the north field has been extensively studied in the past 30 years for its geological and tectonic features (DobsonEvolution of the geothermal fluids at Los Azufres, Mexico, as traced by noble gas isotopes, 18 O, D

  5. Combining CSP and ObjectZ: Finite or Infinite Trace Semantics?

    E-Print Network [OSTI]

    Olderog, Ernst-Rüdiger

    Combining CSP and Object­Z: Finite or Infinite Trace Semantics? Clemens Fischer Universit semantics as a means of com­ bining CSP with Object­Z. The purpose of this combination is to more effectively specify complex, concurrent systems: while CSP is ideal for modelling systems of concurrent

  6. seari.mit.edu 2009 Massachusetts Institute of Technology 1 Using Pareto Trace to Determine

    E-Print Network [OSTI]

    de Weck, Olivier L.

    ) and minimize aggregate cost (lifecycle cost) #12;seari.mit.edu © 2009 Massachusetts Institute of Technology 7seari.mit.edu © 2009 Massachusetts Institute of Technology 1 Using Pareto Trace to Determine System Conference March 25, 2009 #12;seari.mit.edu © 2009 Massachusetts Institute of Technology 2 Managing System

  7. Modeling Impacts of Management on Carbon Sequestration and Trace Gas Emissions in Forested

    E-Print Network [OSTI]

    Modeling Impacts of Management on Carbon Sequestration and Trace Gas Emissions in Forested Wetland-DNDC, was modified to enhance its capacity to predict the impacts of management practices on carbon sequestration nonnegligible roles in mitigation in comparison with carbon sequestration. Forests are recognized for having

  8. Tracing Genealogical Data with TimeNets Nam Wook Kim, Stuart K. Card, Jeffrey Heer

    E-Print Network [OSTI]

    Heer, Jeffrey

    Tracing Genealogical Data with TimeNets Nam Wook Kim, Stuart K. Card, Jeffrey Heer Computer ScienceNets, a new visualization technique for ge- nealogical data. Most genealogical diagrams prioritize the display Interfaces Keywords: Visualization, genealogy, timelines, TimeNets INTRODUCTION The combination of networking

  9. Interactive Albedo Editing in Path-Traced Volumetric Materials MILO S HA SAN and RAVI RAMAMOORTHI

    E-Print Network [OSTI]

    California at San Diego, University of

    Interactive Albedo Editing in Path-Traced Volumetric Materials MILO S HA SAN and RAVI RAMAMOORTHI-reflection. This complexity can be handled by simulating the full volumetric light transport within these ma- terials by Monte by simulating the full volumetric light transport within these materials by Monte Carlo algorithms. E

  10. Probabilistic vessel axis tracing and its application to vessel segmentation with stream surfaces and minimum cost paths

    E-Print Network [OSTI]

    Chung, Albert C. S.

    Probabilistic vessel axis tracing and its application to vessel segmentation with stream surfaces May 2007 Available online 2 June 2007 Abstract We propose a novel framework to segment vessels on their cross-sections. It starts with a probabilistic vessel axis tracing in a gray-scale three

  11. STRATIGRAPHIC DISTRIBUTION AND PALEOENVIRONMENTAL IMPLICATIONS OF PEDOGENIC FEATURES AND TRACE FOSSILS FROM THE LOWER PERMIAN OF KANSAS

    E-Print Network [OSTI]

    Counts, John W.

    2012-12-31

    .....................................................................122 Figure 33. Pupation chambers produced in Experiment..............................................................123 Figure 34. Adult beetle traces produced in Experiment 2...........................................................124 Figure 35. Traces... produced in Experiment 3...............................................................................125 Figure 36. Steps in burrowing mechanism used by masked chafer larvae..................................126 Figure 37. Adult masked chafer beetle...

  12. Dynamically adjustable annular laser trapping based on axicons

    SciTech Connect (OSTI)

    Shao, Bing; Esener, Sadik C.; Nascimento, Jaclyn M.; Botvinick, Elliot L.; Berns, Michael W

    2006-09-01

    To study the chemotactic response of sperm to an egg and to characterize sperm motility, an annular laser trap based on axicons is designed, simulated with the ray-tracing tool, and implemented. The diameter of the trapping ring can be adjusted dynamically for a range of over 400 {mu}m by simply translating one axicon along the optical axis. Trapping experiments with microspheres and dog sperm demonstrate the feasibility of the system,and the power requirement agrees with theoretical expectation. This new type of laser trapping could provide a prototype of a parallel, objective, and quantitative tool for animal fertility and biotropism study.

  13. Potential for Microbial Stimulation in Deep Vadose Zone Sediments by Gas-Phase Nutrients

    SciTech Connect (OSTI)

    Li, S.W.; Plymale, A. E.; Brockman, F.J.

    2006-04-05

    Viable microbial populations are low, typically 10{sup 4} cells per gram, in deep vadose zones in arid climates. There is evidence that microbial distribution in these environments is patchy. In addition, infiltration or injection of nutrient-laden water has the potential to spread and drive contaminants downward to the saturated zone. For these reasons, there are uncertainties regarding the feasibility of bioremediation of recalcitrant contaminants in deep vadose zones. The objectives of this study were to investigate the occurrence of denitrifying activity and gaseous carbon-utilizing activity in arid-climate deep vadose zone sediments contaminated with, and/or affected by past exposure to, carbon tetrachloride (CT). These metabolisms are known to degrade CT and/or its breakdown product chloroform under anoxic conditions. A second objective was to determine if CT would be degraded in these sediments under unsaturated, bulk-phase aerobic incubation conditions. Both denitrifier population (determined by MPN) and microbial heterotrophic activity (measured by mineralization of 14-C labeled glucose and acetate) were relatively low and the sediments with greater in situ moisture (10-21% versus 2-7%) tended to have higher activities. When sediments were amended with gaseous nutrients (nitrous oxide and triethyl/tributyl phosphate) and gaseous C sources (a mixture of methane, ethane, propylene, propane, and butane) and incubated for 6 months, approximately 50% of the samples showed removal of one or more gaseous C sources, with butane most commonly used (44% of samples), followed by propylene (42%), propane (31%), ethane (22%), and methane (4%). Gaseous N and gaseous P did not stimulate removal of gaseous C substrates compared to no addition of N and P. CT and gaseous C sources were spiked into the sediments that removed gaseous C sources to determine if hydrocarbon-degraders have the potential to degrade CT under unsaturated conditions. In summary, gaseous C sources--particularly butane and propylene--have promise for increasing the numbers and activity of indigenous microbial populations in arid-climate deep vadose zone sediments.

  14. Phosphorus availability, phytoplankton community dynamics, and taxon-specific phosphorus status in the Gulf of Aqaba, Red Sea

    E-Print Network [OSTI]

    Mackey, Katherine R. M; Labiosa, Rochelle G; Calhoun, Mike; Street, Joseph H; Post, Anton F; Paytan, Adina

    2007-01-01

    Inc. E Phosphorus availability, phytoplankton communitythat orthophosphate availability influences phytoplanktonby nutrient 1 Corresponding availability, and which nutrient

  15. JV Task 59-Demonstration of Accelerated In Situ Contaminant Degradation by Vacuum-Enhanced Nutrient Distribution

    SciTech Connect (OSTI)

    Jaroslav Solc

    2007-03-15

    The Energy & Environmental Research Center (EERC) conducted remediation of hydrocarbon-contaminated soils and groundwater at a former Mohler Oil site in Bismarck, North Dakota. The remedial strategy was based on the application of two innovative concepts: (1) design and deployment of the mobile extraction, treatment, and injection units to overcome site limitations associated with urban settings in high-traffic areas and (2) vacuum-controlled nutrient injection within and on the periphery of an induced hydraulic and pneumatic depression. Combined contaminant recovery since the beginning of the project in June 2003 totals over 13,600 lb ({approx}6,170 kg) of hydrocarbons, equivalent to 2176 gallons (8236 l) of product. In situ delivery of 1504 Ib (682 kg) of ionic nitrate and 540 Ib (245 kg) of dissolved oxygen translates into further reduction of about 489 Ib (222 kg) of benzene for the same period and provides for long-term stimulation of the natural attenuation process. In addition to contaminant recovered by extraction and reduced by in situ biodegradation, a total of 4136 Ib (1876 kg) of oxygen was delivered to the saturated zone, resulting in further in situ reduction of an estimated 1324 lb (600 kg) of dissolved-phase hydrocarbons. Based on the results of the EERC demonstration, the North Dakota Department of Health approved site abandonment and termination of the corrective action.

  16. Dynamical Instability of Spherical Star in $f(R,T)$ gravity

    E-Print Network [OSTI]

    Ifra Noureen; M. Zubair

    2014-11-20

    This work is based on stability analysis of spherically symmetric collapsing star surrounding in locally anisotropic environment in $f(R,T)$ gravity, where $R$ is Ricci scalar and $T$ corresponds to the trace of energy momentum tensor. Field equations and dynamical equations are presented in the context of $f(R,T)$ gravity. Perturbation schem is employed on dynamical equations to find the collapse equation. Furthermore, condition on adiabatic index $\\Gamma$ is constructed for Newtonian and post-Newtonian eras to address instability problem. Some constraints on physical quantities are imposed to maintain stable stellar configuration. The results in this work are in accordance with $f(R)$ gravity for specific case.

  17. Behavior of trace and companion elements of ULC-IF steel grades during RH-treatment

    SciTech Connect (OSTI)

    Jungreithmeier, A.; Viertauer, A.; Presslinger, H. [Voest-Alpine Stahl Linz GmbH (Austria)

    1996-12-31

    A large number of metallurgical reactions are caused by lowering the partial pressure during vacuum treatment. One of these reactions is the volatilization of elements with high vapor pressure. The concentration of trace and companion elements during RH-treatment mostly changes because of cooling scrap, deoxidation agents and ferro-alloy additions, slag/metal reactions, vaporization and also because of reactions with the RH-vessel lining. These changes in the concentration of trace and companion elements during RH-treatment are exemplified for ULC-IF (ultra low carbon--interstitial free) steel grades. The elements which are considered are chromium, nickel, molybdenum, copper, vanadium, tin, zinc, lead, phosphorus, sulfur and nitrogen. Calculations of the theoretical equilibrium solubility using thermodynamic data--in dependence of pressure and temperature--correspond well with the values obtained during steel production operations. 67 refs.

  18. Experimental test of a trace formula for two-dimensional dielectric resonators

    E-Print Network [OSTI]

    S. Bittner; E. Bogomolny; B. Dietz; M. Miski-Oglu; P. Oria Iriarte; A. Richter; F. Schäfer

    2010-06-21

    Resonance spectra of two-dimensional dielectric microwave resonators of circular and square shapes have been measured. The deduced length spectra of periodic orbits were analyzed and a trace formula for dielectric resonators recently proposed by Bogomolny et al. [Phys. Rev. E 78, 056202 (2008)] was tested. The observed deviations between the experimental length spectra and the predictions of the trace formula are attributed to a large number of missing resonances in the measured spectra. We show that by taking into account the systematics of observed and missing resonances the experimental length spectra are fully understood. In particular, a connection between the most long-lived resonances and certain periodic orbits is established experimentally.

  19. 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.

  20. MCViNE -- An object oriented Monte Carlo neutron ray tracing simulation package

    E-Print Network [OSTI]

    Lin, Jiao Y Y; Granroth, Garrett E; Abernathy, Douglas L; Lumsden, Mark D; Winn, Barry; Aczel, Adam A; Aivazis, Michael; Fultz, Brent

    2015-01-01

    MCViNE (Monte-Carlo VIrtual Neutron Experiment) is a versatile Monte Carlo (MC) neutron ray-tracing program that provides researchers with tools for performing computer modeling and simulations that mirror real neutron scattering experiments. By adopting modern software engineering practices such as using composite and visitor design patterns for representing and accessing neutron scatterers, and using recursive algorithms for multiple scattering, MCViNE is flexible enough to handle sophisticated neutron scattering problems including, for example, neutron detection by complex detector systems, and single and multiple scattering events in a variety of samples and sample environments. In addition, MCViNE can take advantage of simulation components in linear-chain-based MC ray tracing packages widely used in instrument design and optimization, as well as NumPy-based components that make prototypes useful and easy to develop. These developments have enabled us to carry out detailed simulations of neutron scatteri...

  1. Mass angular momentum inequality for axisymmetric vacuum data with small trace

    E-Print Network [OSTI]

    Zhou, Xin

    2012-01-01

    In this paper, we proved the mass angular momentum inequality\\cite{D1}\\cite{ChrusLiWe}\\cite{SZ} for axisymmetric, asymptotically flat, vacuum constraint data sets with small trace. Given an initial data set with small trace, we construct a boost evolution spacetime of the Einstein vacuum equations as \\cite{ChOM}. Then a perturbation method is used to solve the maximal surface equation in the spacetime under certain growing condition at infinity. When the initial data set is axisymmetric, we get an axisymmetric maximal graph with the same ADM mass and angular momentum as the given data. The inequality follows from the known results\\cite{D1}\\cite{ChrusLiWe}\\cite{SZ} about the maximal graph.

  2. Trace elements in Illinois coals before and after conventional coal preparation

    SciTech Connect (OSTI)

    Demir, I.; Harvey, R.D.; Ruch, R.R.; Steele, J.D. [Illinois State Geological Survey, Champaign, IL (United States)] [and others

    1994-12-31

    Responding to recent technological advances and renewed environmental concerns requires improved characterization of Illinois and other US coals. Much of the existing trace element data on Illinois coals are on channel samples; these data need to be supplemented with data on an-shipped coals. Such data will provide a factual basis for the assessment of noxious emissions at coal-fired electric power plants. The purpose of this study was to determine the trace element concentration in as-shipped coals from Illinois mines, and compare the results to data on channel samples thast represent coal in place prior to mining. Radioactivity of the as-shipped samples was calculated from concentrations of uranium, thorium, and potassium in the samples.

  3. Integration of stable isotope and trace contaminant concentration for enhanced forensic acetone discrimination

    SciTech Connect (OSTI)

    Moran, James J.; Ehrhardt, Christopher J.; Wahl, Jon H.; Kreuzer, Helen W.; Wahl, Karen L.

    2013-07-18

    We analyzed 21 neat acetone samples from 15 different suppliers to demonstrate the utility of a coupled stable isotope and trace contaminant strategy for distinguishing forensically-relevant samples. By combining these two pieces of orthogonal data we could discriminate all of the acetones that were produced by the 15 different suppliers. Using stable isotope ratios alone, we were able to distinguish 9 acetone samples, while the remaining 12 fell into four clusters with highly similar signatures. Adding trace chemical contaminant information enhanced discrimination to 13 individual acetones with three residual clusters. The acetones within each cluster shared a common manufacturer and might, therefore, not be expected to be resolved. The data presented here demonstrates the power of combining orthogonal data sets to enhance sample fingerprinting and highlights the role disparate data could play in future forensic investigations.

  4. Some aspects of nutrient utilization by Burchell's zebra (Equus burchelli bohmi Matschie) in the Serengeti-Mara region, East Africa 

    E-Print Network [OSTI]

    Gogan, Peter John Patrick

    1973-01-01

    . Locations of observations on zebra feeding behavior and activity patterns (stippled) in the Serengeti-Mara region, East Africa. 26 binoculars (7 x 35) or a variable 20 ? 60 power spotting scope were used to facilitate work. 2ebra activities were...SOME ASPECTS OF NUTRIENT UTILIZATION BY BURCHELL'S ZEBRA (EOUUS BURCHELLI BOHMI MATSCHIE) IN THE SERENGETI-MARA REGION, EAST AFRICA A Thesis by PETER JOHN PATRICK GOGAN Submitted to the Graduate College of Texas ASM University in partial...

  5. A field study on the trace metal behavior in atmospheric circulating fluidized-bed coal combustion

    SciTech Connect (OSTI)

    Lind, T.; Kauppinen, E.I.; Jokiniemi, J.K.; Maenhaut, W.

    1994-12-31

    Trace element behavior in atmospheric circulating fluidized-bed combustion (CFBC) of Venezuelan bituminous coal was studied by determining particle size distributions in the CFBC flue gas. The size distributions of calcium, iron, aluminium, and 21 trace elements, Sc, V, Cr, Mn, Co, Ni, Zn, Ga, As, Se, Sr, Cd, Sb, Cs, Ba, La, Ce, Sm, Lu, Pb, and Th, in the size range 0.01--70{micro}m, were determined by collecting aerosols with a low-pressure impactor-cyclone sampling train from the flue gases of an 80-MW(th) CFBC boiler upstream of the electrostatic precipitator. The collected samples were analyzed gravimetrically and with instrumental neutron activation analysis (INAA), particle-induced X-ray emission analysis (PIXE), and inductively coupled plasma mass spectrometry (ICP-MS). The number size distributions of the aerosols were determined with a differential electrical mobility method in the size range 0.01--0.8 {micro}m. In the ultrafine particle mode, i.e., D{sub p} < 0.1 {micro}m, the CFBC number concentrations varied strongly during the experiments, being one to two orders of magnitude lower than those observed in pulverized coal combustion. For all of the elements studied, 75% or more were found in particles larger than 5{micro}m. None of the studied elements showed significant vaporization and subsequent chemical surface reaction or condensation in the CFBC. The Sr, Se, V, Zn, Ga, Cs, Ba, La, Sm, Lu, and Th size distributions resembled those of aluminium, suggesting their occurrence in aluminosilicate-rich particles in the fly ash. The association of the trace elements with aluminium in the fly ash particles may result from reactions of the trace elements with the aluminosilicate mineral particles inside the burning coal particles, or their initial occurrence in association with these minerals.

  6. Effect of Trace Mineral Supplementation on Gastric Ulcers in Exercising Yearling Horses 

    E-Print Network [OSTI]

    Hayes, Alexa Dawn

    2010-10-12

    MINERAL SUPPLEMENTATION ON GASTRIC ULCERS IN EXERCISING YEARLING HORSES A Thesis by ALEXA DAWN HAYES Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER... OF SCIENCE August 2009 Major Subject: Animal Science EFFECT OF TRACE MINERAL SUPPLEMENTATION ON GASTRIC ULCERS IN EXERCISING YEARLING HORSES A Thesis by ALEXA DAWN HAYES Submitted to the Office of Graduate Studies of Texas A...

  7. Stein's method, heat kernel, and traces of powers of elements of compact Lie groups

    E-Print Network [OSTI]

    Jason Fulman

    2010-05-07

    Combining Stein's method with heat kernel techniques, we show that the trace of the jth power of an element of U(n,C), USp(n,C) or SO(n,R) has a normal limit with error term of order j/n. In contrast to previous works, here j may be growing with n. The technique should prove useful in the study of the value distribution of approximate eigenfunctions of Laplacians.

  8. Sensitive Multi-Species Emissions Monitoring: Infrared Laser-Based Detection of Trace-Level Contaminants.

    SciTech Connect (OSTI)

    Steill, Jeffrey D

    2015-01-01

    This report summarizes our development of spectroscopic chemical analysis techniques and spectral modeling for trace-gas measurements of highly-regulated low-concentration species present in flue gas emissions from utility coal boilers such as HCl under conditions of high humidity. Detailed spectral modeling of the spectroscopy of HCl and other important combustion and atmospheric species such as H 2 O, CO 2 , N 2 O, NO 2 , SO 2 , and CH 4 demonstrates that IR-laser spectroscopy is a sensitive multi-component analysis strategy. Experimental measurements from techniques based on IR laser spectroscopy are presented that demonstrate sub-ppm sensitivity levels to these species. Photoacoustic infrared spectroscopy is used to detect and quantify HCl at ppm levels with extremely high signal-to-noise even under conditions of high relative humidity. Additionally, cavity ring-down IR spectroscopy is used to achieve an extremely high sensitivity to combustion trace gases in this spectral region; ppm level CH 4 is one demonstrated example. The importance of spectral resolution in the sensitivity of a trace-gas measurement is examined by spectral modeling in the mid- and near-IR, and efforts to improve measurement resolution through novel instrument development are described. While previous project reports focused on benefits and complexities of the dual-etalon cavity ring-down infrared spectrometer, here details on steps taken to implement this unique and potentially revolutionary instrument are described. This report also illustrates and critiques the general strategy of IR- laser photodetection of trace gases leading to the conclusion that mid-IR laser spectroscopy techniques provide a promising basis for further instrument development and implementation that will enable cost-effective sensitive detection of multiple key contaminant species simultaneously.

  9. Isotopic and trace element characteristics of rhyolites from the Valles Caldera, New Mexico. Final technical report

    SciTech Connect (OSTI)

    Self, S.; Sykes, M.L. [Hawaii Univ., Honolulu, HI (United States). Dept. of Geology and Geophysics; Wolff, J.A. [Texas Univ., Arlington, TX (United States). Dept. of Geology; Skuba, C.E. [McMaster Univ., Hamilton, ON (Canada). Dept. of Geology

    1991-09-01

    This report is a summary of work supported by DOE grant No. DE-FGO5-87ER13795 that was completed or is still in progress. The stated purpose of this grant was to collect geochemical information (trace element, radiogenic isotope and stable oxygen and hydrogen isotope) on samples from core holes VC-I and VC-2a in the Valles caldera in order to establish a consistent detailed intracaldera stratigraphy and relate this to extracaldera volcanic rock units of the Jemez Mountains. Careful stratigraphic control of the intracaldera units is necessary to evaluate models of caldera formation, ignimbrite deposition, and resurgence. Combined stable and radiogenic isotope and trace element data will also provide major insights to petrogenesis of the Bandelier magma system. The composition of non-hydrothermally altered samples from outflow units of the Bandelier Tuff and related volcanics must be known to assess isotopic variations of intracaldera ignimbrite samples. On detailed examination of the VC-2a core samples, it became apparent that hydrothermal alteration is so extensive that no geochemical information useful for stratigraphic fingerprinting or petrogenesis could be obtained, and that correlation with other intracaldera units and extracaldera units must be made on the basis of stratigraphic position and gross lithologic characteristics. Accordingly, we emphasize geochemical data from the extracaldera Bandelier Tuffs and related units which will be useful for comparison with proposed drill hole VC-4 and for any future studies of the region. The stable isotope, radiogenic isotope and trace element data obtained from this project, combined with existing major and trace element data for volcanic rocks from this area, provide an extensive data base essential to future Continental Scientific Drilling Program projects in the Jemez Mountains of New Mexico.

  10. Merger Signatures in the Dynamics of Star-forming Gas

    E-Print Network [OSTI]

    Hung, Chao-Ling; Smith, Howard A; Ashby, Matthew L N; Lanz, Lauranne; Martínez-Galarza, Juan R; Sanders, D B; Zezas, Andreas

    2015-01-01

    Spatially resolved kinematics have been used to determine the dynamical status of star-forming galaxies with ambiguous morphologies, and constrain the importance of galaxy interactions during the assembly of galaxies. However, measuring the importance of interactions or galaxy merger rates requires knowledge of the systematics in kinematic diagnostics and the visible time with merger indicators. We analyze the dynamics of star-forming gas in a set of binary merger hydrodynamic simulations with stellar mass ratios of 1:1 and 1:4. We find that the evolution of kinematic asymmetries traced by star-forming gas mirrors morphological asymmetries derived from mock optical images, in which both merger indicators show the largest deviation from isolated disks during strong interaction phases. Based on a series of simulations with various initial disk orientations, orbital parameters, gas fractions, and mass ratios, we find that the merger signatures are visible for ~0.2-0.4 Gyr with kinematic merger indicators but can...

  11. SEASONAL CHANGES IN TITAN'S POLAR TRACE GAS ABUNDANCE OBSERVED BY CASSINI

    SciTech Connect (OSTI)

    Teanby, N. A. [Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queen's Road, Bristol BS8 1RJ (United Kingdom); Irwin, P. G. J. [Atmospheric, Oceanic and Planetary Physics, Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU (United Kingdom); De Kok, R. [SRON, Sorbonnelaan 2, 3584 CA Utrecht (Netherlands); Nixon, C. A., E-mail: n.teanby@bristol.ac.u [Department of Astronomy, University of Maryland, College Park, MD 20742 (United States)

    2010-11-20

    We use a six-year data set (2004-2010) of mid-infrared spectra measured by Cassini's Composite InfraRed Spectrometer to search for seasonal variations in Titan's atmospheric temperature and composition. During most of Cassini's mission Titan's northern hemisphere has been in winter, with an intense stratospheric polar vortex highly enriched in trace gases, and a single south-to-north circulation cell. Following northern spring equinox in mid-2009, dramatic changes in atmospheric temperature and composition were expected, but until now the temporal coverage of polar latitudes has been too sparse to discern trends. Here, we show that during equinox and post-equinox periods, abundances of trace gases at both poles have begun to increase. We propose that increases in north polar trace gases are due to a seasonal reduction in gas depletion by horizontal mixing across the vortex boundary. A simultaneous south polar abundance increase suggests that Titan is now entering, or is about to enter, a transitional circulation regime with two branches, rather than the single branch circulation pattern previously observed.

  12. TRACE Model for Simulation of Anticipated Transients Without Scram in a BWR

    SciTech Connect (OSTI)

    Cheng L. Y.; Baek J.; Cuadra,A.; Aronson, A.; Diamond, D.; Yarsky, P.

    2013-11-10

    A TRACE model has been developed for using theTRACE/PARCS computational package [1, 2] to simulate anticipated transients without scram (ATWS) events in a boiling water reactor (BWR). The model represents a BWR/5 housed in a Mark II containment. The reactor and the balance of plant systems are modeled in sufficient detail to enable the evaluation of plant responses and theeffectiveness of automatic and operator actions tomitigate this beyond design basis accident.The TRACE model implements features thatfacilitate the simulation of ATWS events initiated by turbine trip and closure of the main steam isolation valves (MSIV). It also incorporates control logic to initiate actions to mitigate the ATWS events, such as water levelcontrol, emergency depressurization, and injection of boron via the standby liquid control system (SLCS). Two different approaches have been used to model boron mixing in the lower plenum of the reactor vessel: modulate coolant flow in the lower plenum by a flow valve, and use control logic to modular.

  13. Computational and experimental research on infrared trace by human being contact

    SciTech Connect (OSTI)

    Xiong Zonglong; Yang Kuntao; Ding Wenxiu; Zhang Nanyangsheng; Zheng Wenheng

    2010-06-20

    The indoor detection of the human body's thermal trace plays an important role in the fields of infrared detecting, scouting, infrared camouflage, and infrared rescuing and tracking. Currently, quantitative description and analysis for this technology are lacking due to the absence of human infrared radiation analysis. To solve this problem, we study the heating and cooling process by observing body contact and removal on an object, respectively. Through finite-element simulation and carefully designed experiments, an analytical model of the infrared trace of body contact is developed based on infrared physics and heat transfer theory. Using this model, the impact of body temperature on material thermal parameters is investigated. The sensitivity of material thermal parameters, the thermal distribution, and the changes of the thermograph's contrast are then found and analyzed. Excellent matching results achieved between the simulation and the experiments demonstrate the strong impact of temperature on material thermal parameters. Conclusively, the new model, simulation, and experimental results are beneficial to the future development and implementation of infrared trace technology.

  14. Trace-gas sensing using the compliance voltage of an external cavity quantum cascade laser

    SciTech Connect (OSTI)

    Phillips, Mark C.; Taubman, Matthew S.

    2013-06-04

    Quantum cascade lasers (QCLs) are increasingly being used to detect, identify, and measure levels of trace gases in the air. External cavity QCLs (ECQCLs) provide a broadly-tunable infrared source to measure absorption spectra of chemicals and provide high detection sensitivity and identification confidence. Applications include detecting chemical warfare agents and toxic industrial chemicals, monitoring building air quality, measuring greenhouse gases for atmospheric research, monitoring and controlling industrial processes, analyzing chemicals in exhaled breath for medical diagnostics, and many more. Compact, portable trace gas sensors enable in-field operation in a wide range of platforms, including handheld units for use by first responders, fixed installations for monitoring air quality, and lightweight sensors for deployment in unmanned aerial vehicles (UAVs). We present experimental demonstration of a new chemical sensing technique based on intracavity absorption in an external cavity quantum cascade laser (ECQCL). This new technique eliminates the need for an infrared photodetector and gas cell by detecting the intracavity absorption spectrum in the compliance voltage of the laser device itself. To demonstrate and characterize the technique, we measure infrared absorption spectra of chemicals including water vapor and Freon-134a. Sub-ppm detection limits in one second are achieved, with the potential for increased sensitivity after further optimization. The technique enables development of handheld, high-sensitivity, and high-accuracy trace gas sensors for in-field use.

  15. The Microscopic Linear Dynamics

    E-Print Network [OSTI]

    Penny, Will

    The Microscopic Brain Will Penny Linear Dynamics Exponentials Matrix Exponential Eigendecomposition References The Microscopic Brain Will Penny 7th April 2011 #12;The Microscopic Brain Will Penny Linear;The Microscopic Brain Will Penny Linear Dynamics Exponentials Matrix Exponential Eigendecomposition

  16. Maps and inverse maps in open quantum dynamics

    E-Print Network [OSTI]

    Thomas F. Jordan

    2008-07-08

    Two kinds of maps that describe evolution of states of a subsystem coming from dynamics described by a unitary operator for a larger system, maps defined for fixed mean values and maps defined for fixed correlations, are found to be quite different for the same unitary dynamics in the same situation in the larger system. An affine form is used for both kinds of maps to find necessary and sufficient conditions for inverse maps. All the different maps with the same homogeneous part in their affine forms have inverses if and only if the homogeneous part does. Some of these maps are completely positive; others are not, but the homogeneous part is always completely positive. The conditions for an inverse are the same for maps that are not completely positive as for maps that are. For maps defined for fixed mean values, the homogeneous part depends only on the unitary operator for the dynamics of the larger system, not on any state or mean values or correlations. Necessary and sufficient conditions for an inverse are stated several different ways: in terms of the maps of matrices, basis matrices, density matrices, or mean values. The inverse maps are generally not tied to the dynamics the way the maps forward are. A trace-preserving completely positive map that is unital can not have an inverse that is obtained from any dynamics described by any unitary operator for any states of a larger system.

  17. [CII] dynamics in the S140 region

    SciTech Connect (OSTI)

    Dedes, C.; Röllig, M.; Okada, Y.; Ossenkopf, V.; Mookerjea, B.; Collaboration: WADI Team

    2015-01-22

    We report the observation of [C II] emission in a cut through the S140 region together with single pointing observations of several molecular tracers, including hydrides, in key regions of the photon-dominated region (PDR) and molecular cloud [1]. At a distance of 910 pc, a BOV star ionizes the edge of the molecular cloud L1204, creating S140. In addition, the dense molecular cloud hosts a cluster of embedded massive young stellar objects only 75' from the H II region [e.g. 2, 3]. We used HIFI on Herschel to observe [CII] in a strip following the direction of the impinging radiation across the ionisation front and through the cluster of embedded YSOs. With [C II], we can trace the ionising radiation and, together with the molecular tracers such as CO isotopologues and HCO{sup +}, study the dynamical processes in the region. Combining HIFIs high spectral resolution data with ground based molecular data allows us to study the dynamics and excitation conditions both in the ionization front and the dense molecular star forming region and model their physical conditions [4].

  18. Chemical Structure and Dynamics annual report 1997

    SciTech Connect (OSTI)

    Colson, S.D.; McDowell, R.S.

    1998-03-01

    The Chemical Structure and Dynamics (CS and D) program is a major component of the William R. Wiley Environmental Molecular Sciences Laboratory (EMSL), developed by Pacific Northwest National Laboratory (PNNL) to provide a state-of-the-art collaborative facility for studies of chemical structure and dynamics. The authors respond to the need for a fundamental, molecular level understanding of chemistry at a wide variety of environmentally important interfaces by: (1) extending the experimental characterization and theoretical description of chemical reactions to encompass the effects of condensed media and interfaces; (2) developing a multidisciplinary capability for describing interfacial chemical processes within which the new knowledge generated can be brought to bear on complex phenomena in environmental chemistry and in nuclear waste processing and storage; and (3) developing state-of-the-art analytical methods for characterizing complex materials of the types found in stored wastes and contaminated soils, and for detecting and monitoring trace atmospheric species. The focus of the research is defined primarily by DOE`s environmental problems: fate and transport of contaminants in the subsurface environment, processing and storage of waste materials, cellular effects of chemical and radiological insult, and atmospheric chemistry as it relates to air quality and global change. Twenty-seven projects are described under the following topical sections: Reaction mechanisms at interfaces; High-energy processes at environmental interfaces; Cluster models of the condensed phase; and Miscellaneous.

  19. Quantum speed-up transition in open system dynamics

    E-Print Network [OSTI]

    Xiang Hao; Wenjiong Wu

    2015-10-20

    The rate of the trace distance is used to evaluate quantum speed-up for arbitrary mixed states. Compared with some present methods, the approach based on trace distance can provide an optimal bound to the speed of the evolution. The dynamical transition from no speed-up region to speed-up region takes on in the spontaneous decay of an two-level atom with detuning. The evolution is characteristic of the alternating behavior between quantum speed-up and speed-down in the strong system-reservoir coupling regime. Under the o?ff-resonance condition, the dynamical evolution can be accelerated for short previous times and then decelerated to a normal process either in the weak or strong coupling regime. From the time-energy uncertainty relation, we demonstrate that the potential capacity for quantum speed-up evolution is closely related to the energy flow-back from the reservoir to the system. The negative decay rate for short time intervals leads to the speed-up process where the photons previously emitted by the atom are reabsorbed at a later time. The values of the spontaneous decay rate becomes positive after a long enough time, which results in the normal evolution with no speed-up potential.

  20. Categorical Introduction to Dynamical Systems Symbolic Dynamical Systems

    E-Print Network [OSTI]

    Kahng, Byung-Jay

    Categorical Introduction to Dynamical Systems Symbolic Dynamical Systems Symbolic Embedding Examples Results Embeddings in Symbolic Dynamical Systems Jonathan Jaquette Swarthmore College July 22, 2009 Jonathan Jaquette Embeddings in Symbolic Dynamical Systems #12;Categorical Introduction

  1. Promoting catalysis and high-value product streams by in situ hydroxyapatite crystallization during hydrothermal liquefaction of microalgae cultivated with reclaimed nutrients v

    E-Print Network [OSTI]

    Roberts, Griffin W.; Sturm, Belinda; Hamdeh, Umar; Stanton, Gabriel E.; Rocha, Alejandra; Kinsella, Tiffany L.; Fortier, Marie-Odile P.; Sazdar, Shayan; Detamore, Michael; Stagg-Williams, Susan M.

    2015-02-20

    convert algae, grown with reclaimed nutrients, into pure-phase substituted hydroxyapatite nanocrystals and a petroleum-like biocrude. The hydroxyapatite contains substitutions of carbonate, silicate, and magnesium, and can be easily modified to produce...

  2. Field-scale investigation of enhanced petroleum hydrocarbon biodegradation in the vadose zone combining soil venting as an oxygen source with moisture and nutrient addition. Appendices. Doctoral thesis

    SciTech Connect (OSTI)

    Miller, R.N.

    1990-01-01

    This document contains appendices regarding a reprint on a field scale investigation of enhanced petroleum hydrocarbon biodegradation in the vadose zone combining soil venting as a oxygen source with moisture and nutrient addition.

  3. Intramolecular and nonlinear dynamics

    SciTech Connect (OSTI)

    Davis, M.J. [Argonne National Laboratory, IL (United States)

    1993-12-01

    Research in this program focuses on three interconnected areas. The first involves the study of intramolecular dynamics, particularly of highly excited systems. The second area involves the use of nonlinear dynamics as a tool for the study of molecular dynamics and complex kinetics. The third area is the study of the classical/quantum correspondence for highly excited systems, particularly systems exhibiting classical chaos.

  4. Engineering, Nutrient Removal, and Feedstock Conversion Evaluations of Four Corn Stover Harvest Scenarios

    SciTech Connect (OSTI)

    Reed L. Hoskinson; Douglas L. Karlen; Stuart J. Birrell; Corey W. Radtke; W.W. Wilhelm

    2007-02-01

    Crop residue has been identified as a near-term source of biomass for renewable fuel, heat, power, chemicals and other bio-materials. Replicated plots were established in a corn (Zea mays L.) field near Ames, IA to evaluate four harvest scenarios (low cut, high-cut top, high-cut bottom, and normal cut). A prototype one-pass harvest system was used to collect the residue samples. High-cut top and high-cut bottom samples were obtained from the same plots in two separate operations. Chemical composition, dilute acid pretreatment response, ethanol conversion efficiency and gasification parameters for each scenario were determined. Mean grain yield (10.1 Mg ha-1 dry weight) was representative of the area. The four harvest scenarios removed 6.7, 4.9, 1.7, and 5.1 Mg ha-1 of dry matter. Expressed as harvest indices (HI) the values were 0.60 for low cut, 0.66 for normal cut, and 0.61 for the total high-cut (top + bottom) scenarios, which are probably realistic for machine harvest and current hybrids. The macro-nutrient replacement value for the normal harvest scenario under our conditions was $57.36 ha-1 or $11.27 Mg-1. Harvesting stalk bottoms increased the water content, the risk of combine damage, the transportation costs, and left insufficient soil cover, while also producing a problematic feedstock. Harvesting stover at current combine height (~40 cm) would be best for farmers and ethanol producers because of better harvest speed and efficiency as well as the quality of the ethanol feedstock.

  5. Mycorrhizae and phosphorus fertilization effects on survival, growth, total biomass and leaf nutrient levels of two-year old Leucaena leucocephala 

    E-Print Network [OSTI]

    Mbugua, David Kahuria

    1985-01-01

    MYCORRHIZAE AND PHOSPHORUS FERTILIZATION EFFECTS ON SURVIVAL, GRONTH& TOTAL BIOMASS AND LEAF NUTRIENT LEVELS OF TWO-YEAR CLD LEUCAENA LEUCOCEPHALA A Thesis by DAVID KAHURIA MBUGUA Submitted to the Graduate College of Texas A&M University... in partial fulfillment of the requirement for the degree of MASTER OF SCIENCE August 1985 Major Subject: Forestry MYCORRHIZAE AND PHOSPHORUS FERTILIZATION EFFECTS ON SURVIVAL, GROWTH& TOTAL BIOMASS AND LEAF NUTRIENT LEVELS OF TWO-YEAR OLD LEUCAENA...

  6. The potential of positron emission tomography for intratreatment dynamic lung tumor tracking: A phantom study

    SciTech Connect (OSTI)

    Yang, Jaewon [Department of Electrical Engineering, Stanford University, Stanford, California 94305 and Department of Radiation Oncology, Stanford University, Stanford, California 94305 (United States)] [Department of Electrical Engineering, Stanford University, Stanford, California 94305 and Department of Radiation Oncology, Stanford University, Stanford, California 94305 (United States); Yamamoto, Tokihiro [Department of Radiation Oncology, University of California Davis, Sacramento, California 95817 (United States)] [Department of Radiation Oncology, University of California Davis, Sacramento, California 95817 (United States); Mazin, Samuel R. [RefleXion Medical, Inc., Burlingame, California 94010 (United States)] [RefleXion Medical, Inc., Burlingame, California 94010 (United States); Graves, Edward E. [Department of Radiation Oncology, Stanford University, Stanford, California 94305 (United States)] [Department of Radiation Oncology, Stanford University, Stanford, California 94305 (United States); Keall, Paul J., E-mail: paul.keall@sydney.edu.au [Radiation Physics Laboratory, University of Sydney, Sydney, NSW 2006 (Australia)

    2014-02-15

    Purpose: This study aims to evaluate the potential and feasibility of positron emission tomography for dynamic lung tumor tracking during radiation treatment. The authors propose a center of mass (CoM) tumor tracking algorithm using gated-PET images combined with a respiratory monitor and investigate the geometric accuracy of the proposed algorithm. Methods: The proposed PET dynamic lung tumor tracking algorithm estimated the target position information through the CoM of the segmented target volume on gated PET images reconstructed from accumulated coincidence events. The information was continuously updated throughout a scan based on the assumption that real-time processing was supported (actual processing time at each frame ?10?s). External respiratory motion and list-mode PET data were acquired from a phantom programmed to move with measured respiratory traces (external respiratory motion and internal target motion) from human subjects, for which the ground truth target position was known as a function of time. The phantom was cylindrical with six hollow sphere targets (10, 13, 17, 22, 28, and 37 mm in diameter). The measured respiratory traces consisted of two sets: (1) 1D-measured motion from ten healthy volunteers and (2) 3D-measured motion from four lung cancer patients. The authors evaluated the geometric accuracy of the proposed algorithm by quantifying estimation errors (Euclidean distance) between the actual motion of targets (1D-motion and 3D-motion traces) and CoM trajectories estimated by the proposed algorithm as a function of time. Results: The time-averaged error of 1D-motion traces over all trajectories of all targets was 1.6 mm. The error trajectories decreased with time as coincidence events were accumulated. The overall error trajectory of 1D-motion traces converged to within 2 mm in approximately 90 s. As expected, more accurate results were obtained for larger targets. For example, for the 37 mm target, the average error over all 1D-motion traces was 1.1 mm; and for the 10 mm target, the average error over all 1D-motion traces was 2.8 mm. The overall time-averaged error of 3D-motion traces was 1.6 mm, which was comparable to that of the 1D-motion traces. There were small variations in the errors between the 3D-motion traces, although the motion trajectories were very different. The accuracy of the estimates was consistent for all targets except for the smallest. Conclusions: The authors developed an algorithm for dynamic lung tumor tracking using list-mode PET data and a respiratory motion signal, and demonstrated proof-of-principle for PET-guided lung tumor tracking. The overall tracking error in phantom studies is less than 2 mm.

  7. A Measure of Non-Markovianity for Unital Quantum Dynamical Maps

    E-Print Network [OSTI]

    S. Haseli; S. Salimi; A. S. Khorashad

    2015-09-22

    One of the most important topics in the study of the dynamics of open quantum system is information exchange between system and environment. Based on the features of a back-flow information from an environment to a system, an approach is provided to detect non-Markovianity for unital dynamical maps. The method takes advantage of non-contractive property of the von Neumann entropy under completely positive and trace preserving unital maps. Accordingly, for the dynamics of a single qubit as an open quantum system, the sign of the time-derivative of the density matrix eigenvalues of the system determines the non-Markovianity of unital quantum dynamical maps. The main characteristics of the measure is to make the corresponding calculations and optimization procedure simpler.

  8. Introduction Dynamical properties of (-)-transformation Dynamical properties of

    E-Print Network [OSTI]

    /04/2010 Digital expansions, dynamics and tilings, Aussois Dynamical properties of the (-)-transformation 1/17 #12 of (-)-transformation Digital expansions, dynamics and tilings, Aussois Dynamical properties of the (-)-transformation 2/17 #12;Introduction Dynamical properties of (-)-transformation Introduction Digital expansions, dynamics

  9. An Efficient Format for Nearly Constant-Time Access to Arbitrary Time Intervals in Large Trace Files

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

    Chan, Anthony; Gropp, William; Lusk, Ewing

    2008-01-01

    A powerful method to aid in understanding the performance of parallel applications uses log or trace files containing time-stamped events and states (pairs of events). These trace files can be very large, often hundreds or even thousands of megabytes. Because of the cost of accessing and displaying such files, other methods are often used that reduce the size of the tracefiles at the cost of sacrificing detail or other information. This paper describes a hierarchical trace file format that provides for display of an arbitrary time window in a time independent of the total size of the file and roughlymore »proportional to the number of events within the time window. This format eliminates the need to sacrifice data to achieve a smaller trace file size (since storage is inexpensive, it is necessary only to make efficient use of bandwidth to that storage). The format can be used to organize a trace file or to create a separate file ofannotationsthat may be used with conventional trace files. We present an analysis of the time to access all of the events relevant to an interval of time and we describe experiments demonstrating the performance of this file format.« less

  10. Using a scalar parameter to trace dislocation evolution in atomistic modeling

    SciTech Connect (OSTI)

    Yang, Jinbo [ORNL; Zhang, Z F [Shenyang National Laboratory for Materials Science; Osetskiy, Yury N [ORNL; Stoller, Roger E [ORNL

    2015-01-01

    A scalar gamma-parameter is proposed from the Nye tensor. Its maximum value occurs along a dislocation line, either straight or curved, when the coordinate system is purposely chosen. This parameter can be easily obtained from the Nye tensor calculated at each atom in atomistic modeling. Using the gamma-parameter, a fully automated approach is developed to determine core atoms and the Burgers vectors of dislocations simultaneously. The approach is validated by revealing the smallest dislocation loop and by tracing the whole formation process of complicated dislocation networks on the fly.

  11. Flow, Salts, and Trace Elements in the Rio Grande: A Review 

    E-Print Network [OSTI]

    Miyamoto, S.; Fenn, L. B.; Swietlik, D.

    1995-01-01

    injection, unless ocean or inland lake disposals are feasible. Future research should include the development of cost-effective and ecologically sound saline wa- ter disposal options, including such options as saline solar ponds and salt mining. Another... stream_source_info tr169.pdf.txt stream_content_type text/plain stream_size 135875 Content-Encoding UTF-8 stream_name tr169.pdf.txt Content-Type text/plain; charset=UTF-8 FLOW, SALTS, AND TRACE ELEMENTS IN THE RIO GRANDE...

  12. Determination of selected trace elements in human head hair by neutron activation analysis 

    E-Print Network [OSTI]

    Courson, Leonard Austin

    1981-01-01

    ) Leonard Austin Courson, B. S. , Auburn University Chairman of Adv1sory Committee: Dr. Richard D. Neff Trace element determination utilizing neutron activation analysis (NAA) has been shown to be a powerful tool in the 1nvesti gati on of human head hair...- culate a probab1lity that two different hair samples are of common origin. By sampling 299 members of the population of the Central Texas area and uti li z1 ng NAA to determine the concentrations of the short lived activation products, such a data base...

  13. The use of solvent extraction in trace metal analysis by atomic absorption spectroscopy 

    E-Print Network [OSTI]

    Eddy, Raymond Douglas

    1968-01-01

    of the mcouir'amer. ts cr the ceSr ee o J "" . uar'&I Major S&uh&oct: Chemis'. ":y THE USE OF SOLVENT EXTRACTION IN TRACE METAL ANALYSIS BY ATOMIC ABSORPTION SPECTROSCOPY A Thesis By Raymond Douglas Eddy Approved as to style and content by (Chai n of Co... the lower limit o! detection of most metais is in tne range of 0. 0q to 1. . 0 ppm (1). T. ie lower limit of detectio. for iron sr d nickel iwas re" artsd by Bar: as (;2) as 0. 05 porn. Ar is ofi, en i, h case the ans. - lyi icai chemi s; is see...

  14. Characteristic emission enhancement in the atmosphere with Rn trace using metal assisted LIBS

    SciTech Connect (OSTI)

    Hashemi, M. M.; Parvin, P. Moosakhani, A.; Mortazavi, S. Z.; Reyhani, A.; Majdabadi, A.; Abachi, S.

    2014-06-15

    Several characteristic emission lines from the metal targets (Cu, Zn and Pb) were investigated in trace presence of radon gas in the atmospheric air, using Q-SW Nd:YAG laser induced plasma inside a control chamber. The emission lines of metal species are noticeably enhanced in (Rn+air), relative to those in the synthetic air alone. Similar spectra were also taken in various sub-atmospheric environments in order to determine the optimum pressure for enhancement. Solid-state nuclear track detectors were also employed to count the tracks due to alpha particles for the activity assessment.

  15. Trace Gas Emissions Data from the Carbon Dioxide Information Analysis Center (CDIAC)

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

    CDIAC products are indexed and searchable through a customized interface powered by ORNL's Mercury search engine. Products include numeric data packages, publications, trend data, atlases, and models and can be searched for by subject area, keywords, authors, product numbers, time periods, collection sites, spatial references, etc. Some of the collections may also be included in the CDIAC publication Trends Online: A Compendium of Global Change Data. Most data sets, many with numerous data files, are free to download from CDIAC's ftp area. Collections under the broad heading of Trace Gas Emissions are organized as Fossil-Fuel CO2 Emissions, Land-Use CO2 Emissions, Soil CO2 Emissions, and Methane.

  16. Atom Trap Trace Analysis at ANL | U.S. DOE Office of Science (SC)

    Office of Science (SC) Website

    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 AdministrationRobust,Field-effectWorkingLosThe 26thIWalter H.4OfficeArizona Regions NationalAtom Trap Trace

  17. Laser ray tracing in a parallel arbitrary Lagrangian-Eulerian adaptive mesh refi

    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 likeUniverseIMPACTThousand CubicResourcelogo and- Energy InnovationLaserLaser ray tracing

  18. Dynamical principles in neuroscience

    SciTech Connect (OSTI)

    Rabinovich, Mikhail I.; Varona, Pablo; Selverston, Allen I.; Abarbanel, Henry D. I.

    2006-10-15

    Dynamical modeling of neural systems and brain functions has a history of success over the last half century. This includes, for example, the explanation and prediction of some features of neural rhythmic behaviors. Many interesting dynamical models of learning and memory based on physiological experiments have been suggested over the last two decades. Dynamical models even of consciousness now exist. Usually these models and results are based on traditional approaches and paradigms of nonlinear dynamics including dynamical chaos. Neural systems are, however, an unusual subject for nonlinear dynamics for several reasons: (i) Even the simplest neural network, with only a few neurons and synaptic connections, has an enormous number of variables and control parameters. These make neural systems adaptive and flexible, and are critical to their biological function. (ii) In contrast to traditional physical systems described by well-known basic principles, first principles governing the dynamics of neural systems are unknown. (iii) Many different neural systems exhibit similar dynamics despite having different architectures and different levels of complexity. (iv) The network architecture and connection strengths are usually not known in detail and therefore the dynamical analysis must, in some sense, be probabilistic. (v) Since nervous systems are able to organize behavior based on sensory inputs, the dynamical modeling of these systems has to explain the transformation of temporal information into combinatorial or combinatorial-temporal codes, and vice versa, for memory and recognition. In this review these problems are discussed in the context of addressing the stimulating questions: What can neuroscience learn from nonlinear dynamics, and what can nonlinear dynamics learn from neuroscience?.

  19. Dynamic Instruction Fusion

    E-Print Network [OSTI]

    Lee, Ian

    2012-01-01

    SANTA CRUZ DYNAMIC INSTRUCTION FUSION A thesis submitted in4 2.2 Instruction Fusion & Complex10 3.1 Fusion Selection

  20. Elliptical Galaxy Dynamics

    E-Print Network [OSTI]

    David Merritt

    1998-11-06

    A review of elliptical galaxy dynamics, with a focus on nonintegrable models. Topics covered include torus construction; modelling axisymmetric galaxies; triaxiality; collisionless relaxation; and collective instabilities.

  1. Trace Elements in Hair from Tanzanian Children: Effect of Dietary Factor

    SciTech Connect (OSTI)

    Mohammed, Najat K.; Spyrou, Nicholas M.

    2009-04-19

    Trace elements in certain amounts are essential for childrens' health, because they are present in tissues participating in metabolic reactions of organisms. Deficiency of the essential elements may result in malnutrition, impaired body immunity, and poor resistance to disease. These conditions might be enhanced against a background of additional adverse environmental factors such as toxic elements. The analysis of elements in childrens' hair will give information on the deficiency of essential elements and excess of toxic elements in relation to their diet. In this study, 141 hair samples from children (girls and boys) living in two regions of Tanzanian mainland (Dar es Salaam and Moshi) and the island of Zanzibar have been analysed for trace elements in relation to food consumption habits. The analysis was carried out using long and short irradiation instrumental neutron activation analysis (INAA) of the Nuclear Physics Institute at Rez, Czech Republic. Arithmetic and geometric means with their respective standard deviations are presented for 19 elements. Subgroups were formed according to age, gender, and geographic regions from which the samples were collected. Differences in concentrations for the groups and with other childhood populations were explored and discussed.

  2. Bioturbating animals control the mobility of redox-sensitive trace elements in organic-rich mudstone

    SciTech Connect (OSTI)

    Harazim, Dario; McIlroy, Duncan; Edwards, Nicholas P.; Wogelius, Roy A.; Manning, Phillip L.; Poduska, Kristin M.; Layne, Graham D.; Sokaras, Dimosthenis; Alonso-Mori, Roberto; Bergmann, Uwe

    2015-10-07

    Bioturbating animals modify the original mineralogy, porosity, organic content, and fabric of mud, thus affecting the burial diagenetic pathways of potential hydrocarbon source, seal, and reservoir rocks. High-sensitivity, synchrotron rapid scanning X-ray fluorescence elemental mapping reveals that producers of phycosiphoniform burrows systematically partition redox-sensitive trace elements (i.e., Fe, V, Cr, Mn, Co, Ni, Cu, and As) in fine-grained siliciclastic rocks. Systematic differences in organic carbon content (total organic carbon >1.5 wt%) and quality (?13Corg~0.6‰) are measured between the burrow core and host sediment. The relative enrichment of redox-sensitive elements in the burrow core does not correlate with significant neo-formation of early diagenetic pyrite (via trace metal pyritization), but is best explained by physical concentration of clay- and silt-sized components. A measured loss (~–15%) of the large-ionic-radius elements Sr and Ba from both burrow halo and core is most likely associated with the release of Sr and Ba to pore waters during biological (in vivo) weathering of silt- to clay-sized lithic components and feldspar. In conclusion, this newly documented effect has significant potential to inform the interpretation of geochemical proxy and rock property data, particularly from shales, where elemental analyses are commonly employed to predict reservoir quality and support paleoenvironmental analysis.

  3. Bioturbating animals control the mobility of redox-sensitive trace elements in organic-rich mudstone

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

    Harazim, Dario; McIlroy, Duncan; Edwards, Nicholas P.; Wogelius, Roy A.; Manning, Phillip L.; Poduska, Kristin M.; Layne, Graham D.; Sokaras, Dimosthenis; Alonso-Mori, Roberto; Bergmann, Uwe

    2015-10-07

    Bioturbating animals modify the original mineralogy, porosity, organic content, and fabric of mud, thus affecting the burial diagenetic pathways of potential hydrocarbon source, seal, and reservoir rocks. High-sensitivity, synchrotron rapid scanning X-ray fluorescence elemental mapping reveals that producers of phycosiphoniform burrows systematically partition redox-sensitive trace elements (i.e., Fe, V, Cr, Mn, Co, Ni, Cu, and As) in fine-grained siliciclastic rocks. Systematic differences in organic carbon content (total organic carbon >1.5 wt%) and quality (?13Corg~0.6‰) are measured between the burrow core and host sediment. The relative enrichment of redox-sensitive elements in the burrow core does not correlate with significant neo-formation ofmore »early diagenetic pyrite (via trace metal pyritization), but is best explained by physical concentration of clay- and silt-sized components. A measured loss (~–15%) of the large-ionic-radius elements Sr and Ba from both burrow halo and core is most likely associated with the release of Sr and Ba to pore waters during biological (in vivo) weathering of silt- to clay-sized lithic components and feldspar. In conclusion, this newly documented effect has significant potential to inform the interpretation of geochemical proxy and rock property data, particularly from shales, where elemental analyses are commonly employed to predict reservoir quality and support paleoenvironmental analysis.« less

  4. LASER SPECTROSCOPY AND TRACE ELEMENT ANALYSIS Chapter from the Energy and Environment Division Annual Report 1980

    SciTech Connect (OSTI)

    Various, Authors

    1981-05-01

    In order to control pollutants resulting from energy production and utilization, adequate methods are required for monitoring the level of various substances often present at low concentrations. The Energy and Environment Division Applied Research in Laser Spectroscopy & Analytical Techniques Program is directed toward meeting these needs, Emphasis is on the development of physical methods, as opposed to conventional chemical analysis techniques. The advantages, now widely recognized, include ultra-high sensitivity coupled with minimal sample preparation. In some instances physical methods provide multi-parameter measurements which often provide the only means of achiev·ing the sensitivity necessary for the detection of trace contaminants. Work is reported in these areas: APPLIED PHYSICS AND LASER SPECTROSCOPY RESEARCH; MICROPROCESSOR CONTROLLER ANODIC STRIPPING VOLTAMETER FOR TRACE METALS ANALYSIS IN WATER; THE SURVEY OF INSTRUMENTATION FOR ENVIRONMENTAL MONITORING; THE POSSIBLE CHRONDRITIC NATURE OF THE DANISH CRETACEOUS~TERTIARY BOUNDARY; IMPROVEMENT OF THE SENSITIVITY AND PRECISION OF NEUTRON ACTIVATION ANALYSIS OF SOME ELEMENTS IN PLANKTON AND PLANKTONIC FISH; and SOURCES OF SOME SECONDARILY WORKED OBSIDIAN ARTIFACTS FROM TIKAL, GUATEMALA.

  5. Trace formulae for non-equilibrium Casimir interactions, heat radiation and heat transfer for arbitrary objects

    E-Print Network [OSTI]

    Matthias Krüger; Giuseppe Bimonte; Thorsten Emig; Mehran Kardar

    2012-07-16

    We present a detailed derivation of heat radiation, heat transfer and (Casimir) interactions for N arbitrary objects in the framework of fluctuational electrodynamics in thermal non-equilibrium. The results can be expressed as basis-independent trace formulae in terms of the scattering operators of the individual objects. We prove that heat radiation of a single object is positive, and that heat transfer (for two arbitrary passive objects) is from the hotter to a colder body. The heat transferred is also symmetric, exactly reversed if the two temperatures are exchanged. Introducing partial wave-expansions, we transform the results for radiation, transfer and forces into traces of matrices that can be evaluated in any basis, analogous to the equilibrium Casimir force. The method is illustrated by (re)deriving the heat radiation of a plate, a sphere and a cylinder. We analyze the radiation of a sphere for different materials, emphasizing that a simplification often employed for metallic nano-spheres is typically invalid. We derive asymptotic formulae for heat transfer and non-equilibrium interactions for the cases of a sphere in front a plate and for two spheres, extending previous results. As an example, we show that a hot nano-sphere can levitate above a plate with the repulsive non-equilibrium force overcoming gravity -- an effect that is not due to radiation pressure.

  6. Novel Sorbent-Based Process for High Temperature Trace Metal Removal

    SciTech Connect (OSTI)

    Gokhan Alptekin

    2008-09-30

    The objective of this project was to demonstrate the efficacy of a novel sorbent can effectively remove trace metal contaminants (Hg, As, Se and Cd) from actual coal-derived synthesis gas streams at high temperature (above the dew point of the gas). The performance of TDA's sorbent has been evaluated in several field demonstrations using synthesis gas generated by laboratory and pilot-scale coal gasifiers in a state-of-the-art test skid that houses the absorbent and all auxiliary equipment for monitoring and data logging of critical operating parameters. The test skid was originally designed to treat 10,000 SCFH gas at 250 psig and 350 C, however, because of the limited gas handling capabilities of the test sites, the capacity was downsized to 500 SCFH gas flow. As part of the test program, we carried out four demonstrations at two different sites using the synthesis gas generated by the gasification of various lignites and a bituminous coal. Two of these tests were conducted at the Power Systems Demonstration Facility (PSDF) in Wilsonville, Alabama; a Falkirk (North Dakota) lignite and a high sodium lignite (the PSDF operator Southern Company did not disclose the source of this lignite) were used as the feedstock. We also carried out two other demonstrations in collaboration with the University of North Dakota Energy Environmental Research Center (UNDEERC) using synthesis gas slipstreams generated by the gasification of Sufco (Utah) bituminous coal and Oak Hills (Texas) lignite. In the PSDF tests, we showed successful operation of the test system at the conditions of interest and showed the efficacy of sorbent in removing the mercury from synthesis gas. In Test Campaign No.1, TDA sorbent reduced Hg concentration of the synthesis gas to less than 5 {micro}g/m{sup 3} and achieved over 99% Hg removal efficiency for the entire test duration. Unfortunately, due to the relatively low concentration of the trace metals in the lignite feed and as a result of the intermittent operation of the PSDF gasifier (due to the difficulties in the handling of the low quality lignite), only a small fraction of the sorbent capacity was utilized (we measured a mercury capacity of 3.27 mg/kg, which is only a fraction of the 680 mg/kg Hg capacity measured for the same sorbent used at our bench-scale evaluations at TDA). Post reaction examination of the sorbent by chemical analysis also indicated some removal As and Se (we did not detect any significant amounts of Cd in the synthesis gas or over the sorbent). The tests at UNDEERC was more successful and showed clearly that the TDA sorbent can effectively remove Hg and other trace metals (As and Se) at high temperature. The on-line gas measurements carried out by TDA and UNDEERC separately showed that TDA sorbent can achieve greater than 95% Hg removal efficiency at 260 C ({approx}200g sorbent treated more than 15,000 SCF synthesis gas). Chemical analysis conducted following the tests also showed modest amounts of As and Se accumulation in the sorbent bed (the test durations were still short to show higher capacities to these contaminants). We also evaluated the stability of the sorbent and the fate of mercury (the most volatile and unstable of the trace metal compounds). The Synthetic Ground Water Leaching Procedure Test carried out by an independent environmental laboratory showed that the mercury will remain on the sorbent once the sorbent is disposed. Based on a preliminary engineering and cost analysis, TDA estimated the cost of mercury removal from coal-derived synthesis gas as $2,995/lb (this analysis assumes that this cost also includes the cost of removal of all other trace metal contaminants). The projected cost will result in a small increase (less than 1%) in the cost of energy.

  7. Electromagnetic Wave Dynamics in

    E-Print Network [OSTI]

    Kaiser, Robin

    Mesoscopic Electromagnetic Wave Dynamics in Ultracold Atomic Gases Robin Kaiser and Mark D. Havey Mesoscopic Electromagnetic Wave Dynamics in Ultracold Atomic Gases #12;39 E xperimental developments permit in the transport proper- ties of electromagnetic radiation in strongly scattering random media. Even in weakly

  8. Evaluation of a portable x-ray fluorescence survey meter for the quantitative determination of trace metals in welding fumes 

    E-Print Network [OSTI]

    Fehrenbacher, Mary Catherine

    1984-01-01

    EVALUATION OF A PORTABLE X-RAY FLUORE~ SURVEY METER FOR TIIE QUANTITATIVE DEPERMINATI(gq OF TRACE METALS IN WELDING FIJvtES A THESIS by MARY CATHERINE FEHRENBACHER Submitted to the Graduate College of Texas A%M University in partial... fulfillment of the requirement for the degree of MASTER OF SCIENCE May, 1984 MAJOR SUBJECI': INDUSTRIAL HYGIENE EVALUATION OF A PORTABLE X-RAY FLUORES~ SURVEY METER FOR THE QUANTITATIVE DETERMINATIGN OF TRACE METALS IN WELDING FIJvtES A THESIS by h...

  9. {sup 39}Ar Detection at the 10{sup -16} Isotopic Abundance Level with Atom Trap Trace Analysis

    SciTech Connect (OSTI)

    Jiang, W.; Williams, W.; Bailey, K.; O'Connor, T. P.; Mueller, P.; Davis, A. M.; Hu, S.-M.; Sun, Y. R.; Lu, Z.-T.; Purtschert, R.; Sturchio, N. C.

    2011-03-11

    Atom trap trace analysis, a laser-based atom counting method, has been applied to analyze atmospheric {sup 39}Ar (half-life=269 yr), a cosmogenic isotope with an isotopic abundance of 8x10{sup -16}. In addition to the superior selectivity demonstrated in this work, the counting rate and efficiency of atom trap trace analysis have been improved by 2 orders of magnitude over prior results. The significant applications of this new analytical capability lie in radioisotope dating of ice and water samples and in the development of dark matter detectors.

  10. Annual Report 1998: Chemical Structure and Dynamics

    SciTech Connect (OSTI)

    SD Colson; RS McDowell

    1999-05-10

    The Chemical Structure and Dynamics (CS&D) program is a major component of the William R. Wiley Environmental Molecular Sciences Labo- ratory (EMSL), developed by Pacific Northwest National Laboratory (PNNL) to provide a state-of- the-art collaborative facility for studies of chemical structure and dynamics. We respond to the need for a fundamental, molecular-level understanding of chemistry at a wide variety of environmentally important interfaces by (1) extending the experimental characterization and theoretical description of chemical reactions to encompass the effects of condensed media and interfaces; (2) developing a multidisciplinary capability for describing interracial chemical processes within which the new knowledge generated can be brought to bear on complex phenomena in envi- ronmental chemistry and in nuclear waste proc- essing and storage; and (3) developing state-of- the-art analytical methods for characterizing com- plex materials of the types found in stored wastes and contaminated soils, and for detecting and monitoring trace atmospheric species. Our program aims at achieving a quantitative understanding of chemical reactions at interfaces and, more generally, in condensed media, compa- rable to that currently available for gas-phase reactions. This understanding will form the basis for the development of a priori theories for pre- dicting macroscopic chemical behavior in con- densed and heterogeneous media, which will add significantly to the value of field-scale envi- ronmental models, predictions of short- and long- term nuclear waste storage stabilities, and other areas related to the primary missions of the U.S. Department of Energy (DOE).

  11. Skyrmion Dynamics for Spintronic Devices

    E-Print Network [OSTI]

    Liu, Yizhou

    2013-01-01

    Skyrmion Dynamics for Spintronic Devices A Thesis submittedSkyrmion Dynamics for Spintronic Devices by Yizhou Liua candidate for future spintronic devices. However, Skyrmion

  12. Beyond Contact Tracing: Community-Based Early Detection for Ebola Response

    E-Print Network [OSTI]

    Cooney, Daniel; Bar-Yam, Yaneer

    2015-01-01

    The 2014 Ebola outbreak in west Africa raised many questions about the control of infectious disease in an increasingly connected global society. Limited availability of contact information has made contact tracing difficult or impractical in combating the outbreak. We consider the development of multi-scale public health strategies and simulate policies for community-level response aimed at early screening of communities rather than individuals, as well as travel restrictions to prevent community cross-contamination. Our analysis shows community screening to be effective even at a relatively low level of compliance. In our simulations, 40% of individuals conforming to this policy is enough to stop the outbreak. Simulations with a 50% compliance rate are consistent with the case counts in Liberia during the period of rapid decline after mid September, 2014. We also find the travel restriction policies to be effective at reducing the risks associated with compliance substantially below the 40% level, shortenin...

  13. Introducing GAMER: A fast and accurate method for ray-tracing galaxies using procedural noise

    SciTech Connect (OSTI)

    Groeneboom, N. E.; Dahle, H.

    2014-03-10

    We developed a novel approach for fast and accurate ray-tracing of galaxies using procedural noise fields. Our method allows for efficient and realistic rendering of synthetic galaxy morphologies, where individual components such as the bulge, disk, stars, and dust can be synthesized in different wavelengths. These components follow empirically motivated overall intensity profiles but contain an additional procedural noise component that gives rise to complex natural patterns that mimic interstellar dust and star-forming regions. These patterns produce more realistic-looking galaxy images than using analytical expressions alone. The method is fully parallelized and creates accurate high- and low- resolution images that can be used, for example, in codes simulating strong and weak gravitational lensing. In addition to having a user-friendly graphical user interface, the C++ software package GAMER is easy to implement into an existing code.

  14. COMPACT QEPAS SENSOR FOR TRACE METHANE AND AMMONIA DETECTION IN IMPURE HYDROGEN

    SciTech Connect (OSTI)

    Wright, J; Ferguson, B; Peters, B; Mcwhorter, S

    2011-11-02

    A compact two-gas sensor based on quartz enhanced photoacoustic spectroscopy (QEPAS) was developed for trace methane and ammonia quantification in impure hydrogen. The sensor is equipped with a micro-resonator to confine the sound wave and enhance QEPAS signal. The normalized noise-equivalent absorption coefficients (1{sigma}) of 2.45 x 10{sup -8} cm{sup -1}W/{radical}Hz and 9.1 x 10{sup -9} cm{sup -1}W/{radical}Hz for CH{sub 4} detection at 200 Torr and NH{sub 3} detection at 50 Torr were demonstrated with the QEPAS sensor configuration, respectively. The influence of water vapor on the CH{sub 4} channel was also investigated.

  15. Tracing explosive in solvent using quantum cascade laser with pulsed electric discharge system

    SciTech Connect (OSTI)

    Park, Seong-Wook; Tian, Chao; Martini, Rainer; Chen, Gang; Chen, I-chun Anderson

    2014-11-03

    We demonstrated highly sensitive detection of explosive dissolved in solvent with a portable spectroscopy system (Q-MACS) by tracing the explosive byproduct, N{sub 2}O, in combination with a pulsed electric discharge system for safe explosive decomposition. Using Octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX), the gas was monitored and analyzed by Q-MACS and the presence of the dissolved explosive clearly detected. While HMX presence could be identified directly in the air above the solutions even without plasma, much better results were achieved under the decomposition. The experiment results give an estimated detection limit of 10?ppb, which corresponds to a 15?pg of HMX.

  16. Trace element geochemistry of ordinary chondrite chondrules: the type I/type II chondrule dichotomy

    E-Print Network [OSTI]

    Jacquet, Emmanuel; Gounelle, Matthieu

    2015-01-01

    We report trace element concentrations of silicate phases in chondrules from LL3 ordinary chondrites Bishunpur and Semarkona. Results are similar to previously reported data for carbonaceous chondrites, with rare earth element (REE) concentrations increasing in the sequence olivine ~ 10 K/h) than type I chondrules. Appreciable Na concentrations (3-221 ppm) are measured in olivine from both chondrule types; type II chondrules seem to have behaved as closed systems, which may require chondrule formation in the vicinity of protoplanets or planetesimals. At any rate, higher solid concentrations in type II chondrule forming regions may explain the higher oxygen fugacities they record compared to type I chondrules. Type I and type II chondrules formed in different environments and the correlation between high solid concentrations and/or oxygen fugacities with rapid cooling rates is a key constraint that chondrule formation models must account for.

  17. Surface Cleaning Techniques: Ultra-Trace ICP-MS Sample Preparation and Assay of HDPE

    SciTech Connect (OSTI)

    Overman, Nicole R.; Hoppe, Eric W.; Addleman, Raymond S.

    2013-06-01

    The world’s most sensitive radiation detection and assay systems depend upon ultra-low background (ULB) materials to reduce unwanted radiological backgrounds. Herein, we evaluate methods to clean HDPE, a material of interest to ULB systems and the means to provide rapid assay of surface and bulk contamination. ULB level material and ultra-trace level detection of actinide elements is difficult to attain, due to the introduction of contamination from sample preparation equipment such as pipette tips, sample vials, forceps, etc. and airborne particulate. To date, literature available on the cleaning of such polymeric materials and equipment for ULB applications and ultra-trace analyses is limited. For these reasons, a study has been performed to identify an effective way to remove surface contamination from polymers in an effort to provide improved instrumental detection limits. Inductively Coupled Plasma Mass Spectroscopy (ICP-MS) was utilized to assess the effectiveness of a variety of leachate solutions for removal of inorganic uranium and thorium surface contamination from polymers, specifically high density polyethylene (HDPE). HDPE leaching procedures were tested to optimize contaminant removal of thorium and uranium. Calibration curves for thorium and uranium ranged from 15 ppq (fg/mL) to 1 ppt (pg/mL). Detection limits were calculated at 6 ppq for uranium and 7 ppq for thorium. Results showed the most effective leaching reagent to be clean 6 M nitric acid for 72 hour exposures. Contamination levels for uranium and thorium found in the leachate solutions were significant for ultralow level radiation detection applications.

  18. Incorporation of trace elements in Portland cement clinker: Thresholds limits for Cu, Ni, Sn or Zn

    SciTech Connect (OSTI)

    Gineys, N.; Aouad, G.; Sorrentino, F.; Damidot, D.

    2011-11-15

    This paper aims at defining precisely, the threshold limits for several trace elements (Cu, Ni, Sn or Zn) which correspond to the maximum amount that could be incorporated into a standard clinker whilst reaching the limit of solid solution of its four major phases (C{sub 3}S, C{sub 2}S, C{sub 3}A and C{sub 4}AF). These threshold limits were investigated through laboratory synthesised clinkers that were mainly studied by X-ray Diffraction and Scanning Electron Microscopy. The reference clinker was close to a typical Portland clinker (65% C{sub 3}S, 18% C{sub 2}S, 8% C{sub 3}A and 8% C{sub 4}AF). The threshold limits for Cu, Ni, Zn and Sn are quite high with respect to the current contents in clinker and were respectively equal to 0.35, 0.5, 0.7 and 1 wt.%. It appeared that beyond the defined threshold limits, trace elements had different behaviours. Ni was associated with Mg as a magnesium nickel oxide (MgNiO{sub 2}) and Sn reacted with lime to form a calcium stannate (Ca{sub 2}SnO{sub 4}). Cu changed the crystallisation process and affected therefore the formation of C{sub 3}S. Indeed a high content of Cu in clinker led to the decomposition of C{sub 3}S into C{sub 2}S and of free lime. Zn, in turn, affected the formation of C{sub 3}A. Ca{sub 6}Zn{sub 3}Al{sub 4}O{sub 15} was formed whilst a tremendous reduction of C{sub 3}A content was identified. The reactivity of cements made with the clinkers at the threshold limits was followed by calorimetry and compressive strength measurements on cement paste. The results revealed that the doped cements were at least as reactive as the reference cement.

  19. Dynamic Positioning Simulator Dynamic Positioning Simulator

    E-Print Network [OSTI]

    Vuik, Kees

    to the ocean floor, without using anchors accomplished by two or more propulsive devices controlled by inputs Dynamic Positioning: No tugboats needed; Offshore set-up is quick; Power saving; Precision situations more on Ship: Wind Force Fw = 1 2 air V 2 rw CXw (rw )AT 1 2 air V 2 rw CYw (rw )AL Mw = 1 2 air V 2 rw CMw (rw

  20. Drawing the Free Rigid Body Dynamics According to Jacobi

    E-Print Network [OSTI]

    Pina, Eduardo G

    2015-01-01

    Guided by the Jacobi's work published the year before his death about the rotation of a rigid body, the behavior of the rotation matrix describing the dynamics of the free rigid body is studied. To illustrate this dynamics one draws on a unit sphere the trace of the three unit vectors, in the body system along the principal directions of inertia. A minimal set of properties of Jacobi's elliptic functions are used, those which allow to compute with the necessary precision the dynamics of the rigid body without torques, the so called Euler's top. Emphasis is on the paper published by Jacobi in 1850 on the explicit expression for the components of the rotation matrix. The tool used to compute the trajectories to be drawn are the Jacobi's Fourier series for {\\sl theta} and {\\sl eta} functions with extremely fast convergence. The Jacobi's {\\sl sn}, {\\sl cn} and {\\sl dn} functions, which are better known, are used also as ratios of {\\sl theta} functions which permit quick and accurate computation. Finally the main ...