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Note: This page contains sample records for the topic "nutrient dynamics trace" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


1

Soil Data Released from an LBA Nutrients Dynamics Team  

NLE Websites -- All DOE Office Websites (Extended Search)

data from two pasture chronosequences located on two ranches south of Santarem, Para, Brazil, and east of the Tapajos River. The data set is from a Nutrient Dynamics science...

2

Dynamic ray tracing and traveltime corrections for global seismic tomography  

Science Conference Proceedings (OSTI)

We present a dynamic ray tracing program for a spherically symmetric Earth that may be used to compute Frechet kernels for traveltime and amplitude anomalies at finite frequency. The program works for arbitrarily defined phases and background models. The numerical precisions of kinematic and dynamic ray tracing are optimized to produce traveltime errors under 0.1 s, which is well below the data uncertainty in global seismology. This tolerance level is obtained for an integration step size of about 20 km for the most common seismic phases. We also give software to compute ellipticity, crustal and topographic corrections and attenuation.

Tian Yue [Department of Geosciences, Guyot Hall, Princeton University, NJ 08544 (United States)], E-mail: ytian@princeton.edu; Hung, S.-H. [Department of Geosciences, National Taiwan University, Taipei 106, Taiwan (China); Nolet, Guust [Department of Geosciences, Guyot Hall, Princeton University, NJ 08544 (United States); Montelli, Raffaella [ExxonMobil Upstream Research Company, P.O. Box 22189, GW03-940A, Houston, TX 77252-2189 (United States); Dahlen, F.A. [Department of Geosciences, Guyot Hall, Princeton University, NJ 08544 (United States)

2007-09-10T23:59:59.000Z

3

The trace anomaly and dynamical vacuum energy in cosmology  

Science Conference Proceedings (OSTI)

The trace anomaly of conformal matter implies the existence of massless scalar poles in physical amplitudes involving the stress-energy tensor. These poles may be described by a local effective action with massless scalar fields, which couple to classical sources, contribute to gravitational scattering processes, and can have long range gravitational effects at macroscopic scales. In an effective field theory approach, the effective action of the anomaly is an infrared relevant term that should be added to the Einstein-Hilbert action of classical General Relativity to take account of macroscopic quantum effects. The additional scalar degrees of freedom contained in this effective action may be understood as responsible for both the Casimir effect in flat spacetime and large quantum backreaction effects at the horizon scale of cosmological spacetimes. These effects of the trace anomaly imply that the cosmological vacuum energy is dynamical, and its value depends on macroscopic boundary conditions at the cosmological horizon scale, rather than sensitivity to the extreme ultraviolet Planck scale.

Mottola, Emil [Los Alamos National Laboratory

2010-01-01T23:59:59.000Z

4

Dissolved Nutrient Retention Dynamics in River Networks: A Modeling Investigation of Transient Flow and Scale Effects  

Science Conference Proceedings (OSTI)

In this paper, we use a dynamic network flow model, coupled with a transient storage zone biogeochemical model, to simulate dissolved nutrient removal processes at the channel network scale. We have explored several scenarios in respect of the combination of rainfall variability, and the biological and geomorphic characteristics of the catchment, to understand the dominant controls on removal and delivery of dissolved nutrients (e.g., nitrate). These model-based theoretical analyses suggested that while nutrient removal efficiency is lower during flood events compared to during baseflow periods, flood events contribute significantly to bulk nutrient removal, whereas bulk removal during baseflow periods is less. This is due to the fact that nutrient supply is larger during flood events; this trend is even stronger in large rivers. However, the efficiency of removal during both periods decreases in larger rivers, however, due to (i) increasing flow velocities and thus decreasing residence time, and (ii) increasing flow depth, and thus decreasing nutrient uptake rates. Besides nutrient removal processes can be divided into two parts: in the main channel and in the hyporheic transient storage zone. When assessing their relative contributions the size of the transient storage zone is a dominant control, followed by uptake rates in the main channel and in the transient storage zone. Increasing size of the transient storage zone with downstream distance affects the relative contributions to nutrient removal of the water column and the transient storage zone, which also impacts the way nutrient removal rates scale with increasing size of rivers. Intra-annual hydrologic variability has a significant impact on removal rates at all scales: the more variable the streamflow is, compared to mean discharge, the less nutrient is removed in the channel network. A scale-independent first order uptake coefficient, ke, estimated from model simulations, is highly dependent on the relative size of the transient storage zone and how it changes in the downstream direction, as well as the nature of hydrologic variability.

Ye, Sheng; Covino, Timothy P.; Sivapalan, Murugesu; Basu, Nandita; Li, Hongyi; Wang, Shaowen

2012-06-30T23:59:59.000Z

5

Two Carbon Dynamics and Trace Gas Data Sets from LBA Released  

NLE Websites -- All DOE Office Websites (Extended Search)

Carbon Dynamics and Trace Gas Data Sets from LBA Released The ORNL DAAC and the LBA DIS announce the release of two data sets from the LBA-ECO component of the Large Scale...

6

High-sensitivity detection of trace gases using dynamic photoacoustic spectroscopy  

E-Print Network (OSTI)

Lincoln Laboratory of Massachusetts Institute of Technology has developed a technique known as dynamic photoacoustic spectroscopy (DPAS) that could enable remote detection of trace gases via a field-portable laser-based ...

Wynn, Charles M.

7

Heterogeneity and dynamicity of clouds at scale: Google trace analysis  

Science Conference Proceedings (OSTI)

To better understand the challenges in developing effective cloud-based resource schedulers, we analyze the first publicly available trace data from a sizable multi-purpose cluster. The most notable workload characteristic is heterogeneity: in resource ...

Charles Reiss; Alexey Tumanov; Gregory R. Ganger; Randy H. Katz; Michael A. Kozuch

2012-10-01T23:59:59.000Z

8

Agent-based chemical plume tracing using fluid dynamics  

Science Conference Proceedings (OSTI)

This paper presents a rigorous evaluation of a novel, distributed chemical plume tracing algorithm. The algorithm is a combination of the best aspects of the two most popular predecessors for this task. Furthermore, it is based on solid, formal principles ...

Dimitri Zarzhitsky; Diana Spears; David Thayer; William Spears

2004-04-01T23:59:59.000Z

9

Linear driving force models for dynamic adsorption of volatile organic compound traces by porous adsorbent beds  

Science Conference Proceedings (OSTI)

Models for the dynamic adsorption of volatile organic compound (VOC) traces in air are considered. They are based on the linear driving force approximation associated with various adsorption isotherms characteristic of the couple VOC-adsorbent (Langmuir, ... Keywords: Comsol, Dubinin-Astakhov isotherm, Dynamic adsorption modelling, Finite element

Agnès Joly; Alain Perrard

2009-08-01T23:59:59.000Z

10

Equations for static vacuum solutions arising from trace dynamics modifications to gravitation  

E-Print Network (OSTI)

We derive the equations governing static, spherically symmetric vacuum solutions to the Einstein equations as modified by the frame-dependent effective action arising from trace dynamics. We give several equivalent forms of the master second order, nonlinear differential equation implied by the trace dynamics effective action, and calculate the leading perturbative correction to the Schwarzschild metric. We then analyze the master equation in the regimes $r \\to 0$, $r \\to \\infty$, and $0symmetric case, we calculate the leading effective action corrections to the spatial components of the Einstein equations, which furnish the starting point for a similar analysis (yet to be done) of the static, axially symmetric case.

Stephen L. Adler

2013-08-07T23:59:59.000Z

11

Using Dynamic Tracing Sampling to Measure Long Running Programs  

Science Conference Proceedings (OSTI)

Detailed cache simulation can be useful to both system developers and application writers to understand an application's performance. However, measuring long running programs can be extremely slow. In this paper we present a technique to use dynamic ...

Jeffrey Odom; Jeffrey K. Hollingsworth; Luiz DeRose; Kattamuri Ekanadham; Simone Sbaraglia

2005-11-01T23:59:59.000Z

12

Seven Data Sets Released from LBA Carbon Dynamics and Trace Gas Teams  

NLE Websites -- All DOE Office Websites (Extended Search)

Data Sets Released from LBA Carbon Dynamics and Trace Gas Teams Data Sets Released from LBA Carbon Dynamics and Trace Gas Teams The ORNL DAAC and the LBA DIS announce the release of four data sets from the Carbon Dynamics teams and three data sets from the Trace Gas and Aerosol Fluxes science teams, components of the LBA-ECO Large Scale Biosphere-Atmosphere Experiment in Amazonia (LBA). LBA-ECO CD-02 C and N Isotopes in Leaves and Atmospheric CO2, Amazonas, Brazil . Data set prepared by A.C. de Araujo, J.P.H.B. Ometto, A.J. Dolman, B. Kruijt, M.J. Waterloo and J.R. Ehleringer. This data set reports delta 13C/12C results for leaf tissues and atmospheric carbon dioxide (CO2), delta 15N/14N ratios for leaf tissue, and leaf carbon and nitrogen concentrations along a topographical gradient in old-growth forests near Manaus, Amazonas, Brazil. Also included are coincident

13

Random walk of magnetic field lines in dynamical turbulence: A field line tracing method. I. Slab turbulence  

SciTech Connect

To study the wandering of magnetic field lines is an important subject in theoretical physics. Results of field line random walk theories can be applied in plasma physics as well as astrophysics. Previous investigations are based on magnetostatic models. These models have been used in analytical work as well as in computer simulations to warrant mathematical and numerical tractability. To replace the magnetostatic model by a dynamical turbulence model is a difficult task. In the present article, a field line tracing method is used to describe field line wandering in dynamical magnetic turbulence. As examples different models are employed, namely, the plasma wave model, the damping model of dynamical turbulence, and the random sweeping model. It is demonstrated that the choice of the turbulence model has a very strong influence on the field line structure. It seems that if dynamical turbulence effects are included, Markovian diffusion can be found for other forms of the wave spectrum as in the magnetostatic model. Therefore, the results of the present paper are useful to specify turbulence models. As a further application we consider charged particle transport at early times.

Shalchi, A. [Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2 (Canada)

2010-08-15T23:59:59.000Z

14

Modelling and real-trace-based evaluation of static and dynamic coalescing for energy efficient ethernet  

Science Conference Proceedings (OSTI)

The IEEE Standard 802.3az, namely Energy Efficient Ethernet (EEE), has been recently introduced to reduce the power consumed in LANs. Since then, researchers have proposed various traffic shaping techniques to leverage EEE in order to boost power saving. ... Keywords: bidirectional gigabit links, dynamic coalescing, energy efficient ethernet

Angelos Chatzipapas, Vincenzo Mancuso

2013-01-01T23:59:59.000Z

15

Trace Evidence  

Science Conference Proceedings (OSTI)

... Work with national and international ... 00 Optional Open House and Trace Analysis Lab Tours of ... Ethanol in Water Standard Reference Materials to ...

2012-12-06T23:59:59.000Z

16

Provenance Traces  

E-Print Network (OSTI)

Provenance is information about the origin, derivation, ownership, or history of an object. It has recently been studied extensively in scientific databases and other settings due to its importance in helping scientists judge data validity, quality and integrity. However, most models of provenance have been stated as ad hoc definitions motivated by informal concepts such as "comes from", "influences", "produces", or "depends on". These models lack clear formalizations describing in what sense the definitions capture these intuitive concepts. This makes it difficult to compare approaches, evaluate their effectiveness, or argue about their validity. We introduce provenance traces, a general form of provenance for the nested relational calculus (NRC), a core database query language. Provenance traces can be thought of as concrete data structures representing the operational semantics derivation of a computation; they are related to the traces that have been used in self-adjusting computation, but differ in impor...

Cheney, James; Ahmed, Amal

2008-01-01T23:59:59.000Z

17

Formulated 2-Traces - CECM  

E-Print Network (OSTI)

Nov 19, 1997 ... next · up · previous. Next: Characteristics of truth tables Up: Introduction to Traces Previous: Definition of the n-Trace ...

18

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)

Grass-dominated ecosystems in many regions around the world have experienced increased abundance of woody plants during the past 100 yrs. In the Rio Grande Plains of southern Texas, subtropical woodlands, dominated by C3 trees/shrubs capable of symbiotic N2-fixation, have become significant components of landscapes that were once dominated by C4 grasslands. Upland areas in this region now consist of small discrete clusters and large groves of woody vegetation embedded in a grassy matrix, while 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 patterns of soil ?13C in grids and transects traversing woody patches indicated larger woody groves were formed from small discrete clusters of woody plants that spread laterally and eventually coalesced. Soil ?13C contour maps revealed some clusters are currently growing rapidly towards each other and might coalesce into groves in the near future, while some clusters remained relatively stable. Kriged maps of soil ?13C provided a strong spatial context for future studies aimed at understanding the functional consequences of this change in landscape structure. The dominant invading woody plant, honey mesquite (Prosopis glandulosa), was important in determining the spatial pattern of soil ?13C, supporting the hypothesis that they serve as recruitment foci and facilitate the establishment of subordinate woody species. Leaf ?15N values suggested that the N2-fixing mesquite influenced the N nutrition of nearby non-N2-fixing shrubs, thus, suggesting a mechanism by which mesquite could facilitate establishment of other woody species. In closed-canopy drainage woodlands, however, spatial patterns of soil ?13C were no longer controlled by the presence of mesquite, but by the amount of soil organic carbon and soil texture. The positive correlation between silt+clay and soil ?13C indicates that the formation of organomineral complexes and microaggregates may slow SOC turnover rates and favor the persistence of C4-derived SOC from the original grassland. This study enhances our understanding of potential patterns, causes and consequences of grassland to woodland conversions which are underway today in many grass-dominated ecosystems around the world.

Bai, E

2007-08-01T23:59:59.000Z

19

Nutrient Cycling Study  

DOE Green Energy (OSTI)

The particular goal of this study is to develop measurement techniques for understanding how consortia of organisms from geothermal facilities utilize sulfur and iron for metabolic activity; and in turn, what role that activity plays in initiating or promoting the development of a biofilm on plant substrates. Sulfur cycling is of interest because sulfur is produced in the resource. Iron is found in some of the steel formulations used in plant components and is also added as chemical treatment for reducing sulfide emissions from the plants. This report describes the set-up and operation of a bioreactor for evaluating the response of colonies of geothermal organisms to changes in nutrient and environmental conditions. Data from initial experiments are presented and plans for future testing is discussed.

Peter A. Pryfogle

2005-09-01T23:59:59.000Z

20

Introduction to Traces - CECM  

E-Print Network (OSTI)

Nov 19, 1997 ... Section 2 describes patterns that arise in the construction of truth tables for traces and their theoretical interest for the completeness problem.

Note: This page contains sample records for the topic "nutrient dynamics trace" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

GPU ray tracing  

Science Conference Proceedings (OSTI)

The NVIDIA® OptiX™ ray tracing engine is a programmable system designed for NVIDIA GPUs and other highly parallel architectures. The OptiX engine builds on the key observation that most ray tracing algorithms can be implemented using a small ...

Steven G. Parker; Heiko Friedrich; David Luebke; Keith Morley; James Bigler; Jared Hoberock; David McAllister; Austin Robison; Andreas Dietrich; Greg Humphreys; Morgan McGuire; Martin Stich

2013-05-01T23:59:59.000Z

22

Trace element emissions  

SciTech Connect

The Energy & Environmental Research Center (EERC) is carrying out an investigation that will provide methods to predict the fate of selected trace elements in integrated gasification combined cycle (IGCC) and integrated gasification fuel cell (IGFC) systems to aid in the development of methods to control the emission of trace elements determined to be air toxics. The goal of this project is to identify the effects of critical chemical and physical transformations associated with trace element behavior in IGCC and IGFC systems. The trace elements included in this project are arsenic, chromium, cadmium, mercury, nickel, selenium, and lead. The research seeks to identify and fill, experimentally and/or theoretically, data gaps that currently exist on the fate and composition of trace elements. The specific objectives are to (1) review the existing literature to identify the type and quantity of trace elements from coal gasification systems, (2) perform laboratory-scale experimentation and computer modeling to enable prediction of trace element emissions, and (3) identify methods to control trace element emissions.

Benson, S.A.; Erickson, T.A.; Steadman, E.N.; Zygarlicke, C.J.; Hauserman, W.B.; Hassett, D.J.

1994-10-01T23:59:59.000Z

23

Ray tracing visualization toolkit  

Science Conference Proceedings (OSTI)

The Ray Tracing Visualization Toolkit (rtVTK) is a collection of programming and visualization tools supporting visual analysis of ray-based rendering algorithms. rtVTK leverages layered visualization within the spatial domain of computation, enabling ... Keywords: ray tracing, ray-based rendering, visualization

Christiaan Gribble; Jeremy Fisher; Daniel Eby; Ed Quigley; Gideon Ludwig

2012-03-01T23:59:59.000Z

24

HappyJIT: a tracing JIT compiler for PHP  

Science Conference Proceedings (OSTI)

Current websites are a combination of server-generated dynamic content with client-side interactive programs. Dynamically - typed languages have gained a lot of ground in both of these domains. The growth of Web 2.0 has introduced a myriad of websites ... Keywords: dynamically typed languages, interpreter, just-in-time compilation, php, pypy, rpython, tracing

Andrei Homescu; Alex ?uhan

2012-03-01T23:59:59.000Z

25

Sensor – Data Trace Communication  

This is a method and process for detecting, locating and quantifying physical phenomena using a “data” trace that may be incorporated and/or installed on structures including oil and gas pipes and bridges, buildings, etc.

26

Dynamic  

Office of Legacy Management (LM)

Dynamic Dynamic , and Static , Res.ponse of the Government Oil Shale Mine at ' , . , Rifle, Colorado, to the Rulison Event. , . ; . . DISCLAIMER Portions of this document may be illegible in electronic image products. Images are produced from the best available original document. p ( y c - - a 2-1 0 -4- REPORT AT (29-2) 914 USBM 1 0 0 1 UNITED STATES DEPARTMENT O F THE I NTERIOR BUREAU OF MINES e s.09 P. L. R U S S E L L RESEARCH D l RECTOR Februory 2, lB7O DYNAMIC AND STATIC RESPONSE 'OF THE GOVERNMENT OIL SHALE MINE A T RIFLE, COLORADO, T O THE, RULISON EVENT ORDER FROM CFSTl A S ~ B ~ &J C / This page intentionally left blank CONTENTS Page . . . . . . . . . . . . . . . . . . . . . . . . . H i s t o r i c . a l Des c r i p t i o n 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Summary 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Introduction 3

27

Tracing Geothermal Fluids  

DOE Green Energy (OSTI)

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.

Michael C. Adams Greg Nash

2004-03-31T23:59:59.000Z

28

Dynamics  

NLE Websites -- All DOE Office Websites (Extended Search)

Hydration Hydration Water on Rutile Studied by Backscattering Neutron Spectroscopy and Molecular Dynamics Simulation E. Mamontov,* ,† D. J. Wesolowski, ‡ L. Vlcek, § P. T. Cummings, §,| J. Rosenqvist, ‡ W. Wang, ⊥ and D. R. Cole ‡ Spallation Neutron Source, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6473, Chemical Sciences DiVision, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6110, Department of Chemical Engineering, Vanderbilt UniVersity, NashVille, Tennessee 37235-1604, Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6496, and EnVironmental Sciences DiVision, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6036 ReceiVed: December 20, 2007; ReVised Manuscript ReceiVed: June 4, 2008 The high energy resolution, coupled with the wide dynamic range, of the new backscattering

29

Automated nutrient analyses in seawater  

Science Conference Proceedings (OSTI)

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)

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

1981-02-01T23:59:59.000Z

30

CGC Trace Species Partitioning  

NLE Websites -- All DOE Office Websites (Extended Search)

Trace Species Partitioning as Affected Trace Species Partitioning as Affected by Cold Gas Cleanup Conditions: A Thermodynamic Analysis February 10, 2011 DOE/NETL-2011/1503 T r ace Species P ar titioning at C old G as C leanup C onditions Disclaimer This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name,

31

Multimedia Trace Elements Measurements  

Science Conference Proceedings (OSTI)

Current and future trace element regulations on flue gas emissions, water discharges, and solid waste disposal will result in increasingly stringent limits and substantially increased costs for energy companies. As a result, there is a critical need to address environmental pollutant releases in a holistic, multimedia manner so that a pollutant removed by a control technology in one medium (for example, flue gas) is properly managed in regard to discharges in the other media (water and solid waste). This...

2008-03-25T23:59:59.000Z

32

Flexible reference trace reduction for VM simulations  

Science Conference Proceedings (OSTI)

The unmanageably large size of reference traces has spurred the development of sophisticated trace reduction techniques. In this article we present two new algorithms for trace reduction: Safely Allowed Drop (SAD) and Optimal LRU Reduction ... Keywords: cache hierarchies, locality, reference traces, trace compression, trace reduction

Scott F. Kaplan; Yannis Smaragdakis; Paul R. Wilson

2003-01-01T23:59:59.000Z

33

Nutrient transport model in CHAHNIMEH manmade reservoirs  

Science Conference Proceedings (OSTI)

A Model for predicting nutrient transport to CHAHNIMEH reservoir is developed in this paper. Nitrogen and phosphorous have been simulated as the important parameters in evaluating water quality in the reservoir. Solar radiation and wind flow are considered ... Keywords: CHAHNIMEH, modeling, nutrient, reservoir, transport, water movement

Seyyed Ahmad Mirbagheri; Seyyed Arman Hashemi Monfared

2008-08-01T23:59:59.000Z

34

Trace metal transformation in gasification  

SciTech Connect

The Energy & Environmental Research Center (EERC) is carrying out an investigation that will provide methods to predict the fate of selected trace elements in integrated gasification combined cycle (IGCC) and integrated gasification fuel cell (IGFC) systems to aid in the development of methods to control the emission of trace elements determined to be air toxics. The goal of this project is to identify the effects of critical chemical and physical transformations associated with trace element behavior in IGCC and IGFC systems. The trace elements included in this project are arsenic, chromium, cadmium, mercury, nickel, selenium, and lead. The research seeks to identify and fill, experimentally and/or theoretically, data gaps that currently exist on the fate and composition of trace elements. The specific objectives are to 1) review the existing literature to identify the type and quantity of trace elements from coal gasification systems, 2) perform laboratory-scale experimentation and computer modeling to enable prediction of trace element emissions, and 3) identify methods to control trace element emissions.

Benson, S.A.; Erickson, T.A.; Zygarlicke, C.J.; O`Keefe, C.A.; Katrinak, K.A.; Allen, S.E.; Hassett, D.J.; Hauserman, W.B. [North Dakota Univ., Grand Forks, ND (United States). Energy and Environmental Research Center; Holcombe, N.T. [USDOE Morgantown Energy Technology Center, WV (United States)

1996-12-31T23:59:59.000Z

35

Trace metal transformations in gasification  

SciTech Connect

The Energy & Environmental Research Center (EERC) is carrying out an investigation that will provide methods to predict the fate of selected trace elements in integrated gasification combined cycle (IGCC) and integrated gasification fuel cell (IGFC) systems to aid in the development of methods to control the emission of trace elements determined to be air toxics. The goal of this project is to identify the effects of critical chemical and physical transformations associated with trace element behavior in IGCC and IGFC systems. The trace elements included in this project are arsenic, chromium, cadmium, mercury, nickel, selenium, and lead. The research seeks to identify and fill, experimentally and/or theoretically, data gaps that currently exist on the fate and composition of trace elements. The specific objectives are to (1) review the existing literature to identify the type and quantity of trace elements from coal gasification systems, (2) perform laboratory-scale experimentation and computer modeling to enable prediction of trace element emissions, and (3) identify methods to control trace element emissions.

Benson, S.; Erickson, T.A.; Zygarlicke, C.J. [and others

1995-12-01T23:59:59.000Z

36

Optimally profiling and tracing programs  

Science Conference Proceedings (OSTI)

This paper describes algorithms for inserting monitoring code to profile and trace programs. These algorithms greatly reduce the cost of measuring programs with respect to the commonly used technique of placing code in each basic block. Program profiling ... Keywords: control-flow graph, instruction tracing, instrumentation, profiling

Thomas Ball; James R. Larus

1994-07-01T23:59:59.000Z

37

Trace Anomaly in Geometric Discretization  

E-Print Network (OSTI)

I develop the simplest geometric-discretized analogue of two dimensional scalar field theory, which qualitatively reproduces the trace anomaly of the continuous theory. The discrete analogue provides an interpretation of the trace anomaly in terms of a non-trivial transformation of electric-magnetic duality-invariant modes of resistor networks that accommodate both electric and magnetic charge currents.

Czech, B

2007-01-01T23:59:59.000Z

38

Exploring the use of ray tracing for future games  

Science Conference Proceedings (OSTI)

Rasterization hardware and computer games have always been tightly connected: The hardware implementation of rasterization has made complex interactive 3D games possible while requirements for future games drive the development of increasingly parallel ... Keywords: dynamic scenes, games development, global illumination, graphics hardware, realtime ray tracing, simulation

Heiko Friedrich; Johannes Günther; Andreas Dietrich; Michael Scherbaum; Hans-Peter Seidel; Philipp Slusallek

2006-07-01T23:59:59.000Z

39

Four LBA-ECO Data Sets Released from the Carbon Dynamics and...  

NLE Websites -- All DOE Office Websites (Extended Search)

Carbon Dynamics and Trace Gas Teams. The ORNL DAAC and the LBA DIS announce the release of three data sets from Carbon Dynamics CD-06 team and one data set from the Trace Gas TG-07...

40

Tracing Geothermal Fluids  

DOE Green Energy (OSTI)

Geothermal water must be injected back into the reservoir after it has been used for power production. Injection is critical in maximizing the power production and lifetime of the reservoir. To use injectate effectively the direction and velocity of the injected water must be known or inferred. This information can be obtained by using chemical tracers to track the subsurface flow paths of the injected fluid. Tracers are chemical compounds that are added to the water as it is injected back into the reservoir. The hot production water is monitored for the presence of this tracer using the most sensitive analytic methods that are economically feasible. The amount and concentration pattern of the tracer revealed by this monitoring can be used to evaluate how effective the injection strategy is. However, the tracers must have properties that suite the environment that they will be used in. This requires careful consideration and testing of the tracer properties. In previous and parallel investigations we have developed tracers that are suitable from tracing liquid water. In this investigation, we developed tracers that can be used for steam and mixed water/steam environments. This work will improve the efficiency of injection management in geothermal fields, lowering the cost of energy production and increasing the power output of these systems.

Michael C. Adams; Greg Nash

2004-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "nutrient dynamics trace" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

ARM - Measurement - Trace gas concentration  

NLE Websites -- All DOE Office Websites (Extended Search)

govMeasurementsTrace gas concentration govMeasurementsTrace gas concentration ARM Data Discovery Browse Data Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Measurement : Trace gas concentration The amount per unit volume of trace gases other than carbon dioxide, ozone and water vapor, typically measured in conjunction with in situ aerosol measurements, e.g. carbon monoxide, nitrogen oxides, sulfur dioxide. Categories Atmospheric Carbon, Atmospheric State Instruments The above measurement is considered scientifically relevant for the following instruments. Refer to the datastream (netcdf) file headers of each instrument for a list of all available measurements, including those recorded for diagnostic or quality assurance purposes. ARM Instruments CO : Carbon Monoxide Mixing Ratio System

42

Trace 700 | Open Energy Information  

Open Energy Info (EERE)

Trace 700 Trace 700 Jump to: navigation, search Tool Summary LAUNCH TOOL Name: Trace 700 Agency/Company /Organization: Trane Sector: Energy Focus Area: Buildings, Energy Efficiency Topics: Technology characterizations Resource Type: Software/modeling tools Website: www.trane.com/Commercial/Dna/View.aspx?i=1136 References: http://www.trane.com/Commercial/Dna/View.aspx?i=1136 Detailed HVAC design tool. Can provide heating and cooling load calculation, system sizing, and energy use. A fairly thorough understanding of HVAC is necessary to use this tool. Tool Summary LAUNCH TOOL Name: Trace 700 Agency/Company /Organization: Trane Phase: Create a Vision, Determine Baseline, "Evaluate Options and Determine Feasibility" is not in the list of possible values (Bring the Right People Together, Create a Vision, Determine Baseline, Evaluate Options, Develop Goals, Prepare a Plan, Get Feedback, Develop Finance and Implement Projects, Create Early Successes, Evaluate Effectiveness and Revise as Needed) for this property.

43

The trace partitioning abstract domain  

Science Conference Proceedings (OSTI)

In order to achieve better precision of abstract interpretation-based static analysis, we introduce a new generic abstract domain, the trace partitioning abstract domain. We develop a theoretical framework allowing a wide range of instantiations of the ...

Xavier Rival; Laurent Mauborgne

2007-08-01T23:59:59.000Z

44

Trace species emissions for IGFC  

SciTech Connect

The objectives of this investigation are to study both the fate and distribution of at least five significant, coal-derived trace elements commonly present in coal-gas, in terms of their vaporization during gasification, their condensation and sorption during hot-gas cleanup, as well as their effects on fuel cells, gas turbines, and ultimately the environment. The definition here of trace does not include the major contaminants of sulfur and chlorine, etc., although the simultaneous presence of such major species is always considered in our thermochemical calculations. Of course, many other elements can vaporize in trace quantities from raw coal as either volatile, molecular compounds or as metallic vapors which, besides their deleterious action on the energy conversion systems, can also be detrimental to plant and animal life when emitted into the atmosphere. Hence, an understanding is sought of how the type and quantity of significant trace species in coal-gas changes from the coal pile through cleanup subsystems and the electric generators to the exhaust stack of an integrated system.

Pigeaud, A.E.; Helble, J.J.

1994-10-01T23:59:59.000Z

45

Understanding Ajax applications by connecting client and server-side execution traces  

Science Conference Proceedings (OSTI)

Ajax-enabled Web applications are a new breed of highly interactive, highly dynamic Web applications. Although Ajax allows developers to create rich Web applications, Ajax applications can be difficult to comprehend and thus to maintain. For this reason, ... Keywords: Ajax, Dynamic analysis, Program comprehension, Reverse engineering, Web applications, execution traces

Andy Zaidman; Nick Matthijssen; Margaret-Anne Storey; Arie Deursen

2013-04-01T23:59:59.000Z

46

Understanding reservoir mechanisms using phase and component streamline tracing  

E-Print Network (OSTI)

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. But they fail to capture some important signatures of reservoir dynamics, such as dominant phase in flow, appearance and disappearance of phases (e.g. gas), and flow of components like CO2. In the work being presented, we demonstrate the benefits of visualizing phase and component streamlines which are traced using phase and component fluxes respectively. Although the phase and component streamlines are not appropriate for simulation, as they might be discontinuous, they definitely have a lot of useful information about the reservoir processes and recovery mechanisms. In this research, phase and component streamline tracing has been successfully implemented in three-phase and compositional simulation and the additional information obtained using these streamlines have been explored. The power and utility of the phase and component streamlines have been demonstrated using synthetic examples and two field cases. The new formulation of streamline tracing provides additional information about the reservoir drive mechanisms. The phase streamlines capture the dominant phase in flow in different parts of the reservoir and the area swept corresponding to different phases can be identified. Based on these streamlines the appearance and disappearance of phases can be identified. Also these streamlines can be used for optimizing the field recovery processes like water injection and location of infill wells. Using component streamlines the movement of components like CO2 can be traced, so they can be used for optimizing tertiary recovery mechanisms and tracking of tracers. They can also be used to trace CO2 in CO2 sequestration project where the CO2 injection is for long term storage in aquifers or reservoirs. They have also other potential uses towards study of reservoir processes and behavior such as drainage area mapping for different phases, phase rate allocations to reservoir layers, etc.

Kumar, Sarwesh

2008-08-01T23:59:59.000Z

47

Trace Metals in Oil Laboratory Proficiency Program  

Science Conference Proceedings (OSTI)

Lab Proficiency Testing service for Trace Metals in Oil. Soybean oil sample to test for Iron, Copper, and Nickel using AOCS Official method Ca 18-79. Trace Metals in Oil Laboratory Proficiency Program Laboratory Proficiency Program (LPP) aocs applicants

48

Distributed trace using central performance counter memory  

SciTech Connect

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.

Satterfield, David L.; Sexton, James C.

2013-01-22T23:59:59.000Z

49

Distributed trace using central performance counter memory  

Science Conference Proceedings (OSTI)

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.

Satterfield, David L; Sexton, James C

2013-10-22T23:59:59.000Z

50

Trace Gas Emissions - Energy Information Administration  

U.S. Energy Information Administration (EIA)

This suggests that is appropriate to assume that removing corn stover from the field for use as a process fuel will increase erosion and deplete soil nutrients ...

51

Phytoremediation of Trace Elements by Wetland Plants  

Science Conference Proceedings (OSTI)

Some plants naturally absorb and hyperaccumulate trace elements in their tissues. In a process known as phytoremediation, scientists are harnessing this ability to remove toxic heavy metals and trace elements from contaminated soils and waters. This screening program quantified the capacity of various wetland plant species for removing trace elements from polluted water.

2001-08-23T23:59:59.000Z

52

Original article Belowground biomass and nutrient content in a  

E-Print Network (OSTI)

Original article Belowground biomass and nutrient content in a 47-year-old Douglas-fir plantation, France (Received 17 July 2000; accepted 6 October 2000) Abstract ­ Biomass and nutrient content and root biomass or nutrient content were observed. The root biomass was 58 t of dry matter, which was 18

Recanati, Catherine

53

Rural Development Department (RDV) The World Bank Integrated Nutrient Management Smallholders Generally Lack Adequate Nutrients for their Crops  

E-Print Network (OSTI)

Nutrients are essential for plant growth, but on smallholders ’ farms, an inadequate supply is a key impediment to sustainable food production. Integrated nutrient management (INM) utilizes available organic and inorganic nutrients to build ecologically sound and economically viable farming systems. INM optimizes all aspects of nutrient cycling — supply, uptake, and loss to the environment — to improve food production. This Note describes interventions that may be applied to a range of agroecological zones, cropping systems, and soil types. The interventions address a few key aspects of nutrient management, including improving organic matter in the soil, increasing plant-available nitrogen, and supplying both organic and inorganic fertilizers. These interventions have the

unknown authors

1999-01-01T23:59:59.000Z

54

Trace gases could double climate warming  

SciTech Connect

The atmospheric concentrations of several trace gases capable of changing the climate are increasing. Researchers are concerned about the trace gases despite their miniscule concentrations because they are such efficient absorbers of far-infrared radiation. The trace gases that concern climatologists are methane, nitrous oxide, and the chlorofluorocarbons or CFC's. The increase in atmospheric concentrations of these gases are discussed and atmospheric models predicting their greenhouse effect are described.

Kerr, R.A.

1983-06-24T23:59:59.000Z

55

Visualization and observations on traces - CECM  

E-Print Network (OSTI)

Nov 19, 1997 ... A similar quality appears in resulting columns of a 2-trace operation with the difference that the pattern now merges aspects of the truth table ...

56

Measurement of Trace Uranium Isotopes  

Science Conference Proceedings (OSTI)

The extent to which thermal ionization mass spectrometry (TIMS) can measure trace quantities of 233U and 236U in the presence of a huge excess of natural uranium is evaluated. This is an important nuclear non-proliferation measurement. Four ion production methods were evaluated with three mass spectrometer combinations. The most favorable combinations are not limited by abundance sensitivity; rather, the limitations are the ability to generate a uranium ion beam of sufficient intensity to obtain the required number of counts on the minor isotopes in relationship to detector background. The most favorable situations can measure isotope ratios in the range of E10 if sufficient sample intensity is available. These are the triple sector mass spectrometer with porous ion emitters (PIE) and the single sector mass spectrometer with energy filtering.

Matthew G. Watrous; James E. Delmore

2011-05-01T23:59:59.000Z

57

USDA National Nutrient Database for Standard Reference, Release 22 |  

NLE Websites -- All DOE Office Websites (Extended Search)

USDA National Nutrient Database for Standard Reference, Release 22 USDA National Nutrient Database for Standard Reference, Release 22 Agriculture Community Menu DATA APPS EVENTS DEVELOPER STATISTICS COLLABORATE ABOUT Agriculture You are here Data.gov » Communities » Agriculture » Data USDA National Nutrient Database for Standard Reference, Release 22 Dataset Summary Description The USDA Nutrient Database for Standard Reference, Release 22 (SR22) is the major source of food composition data in the United States and provides the foundation for most public and private sector databases. SR22 contains nutrient data for over 7,500 food items for up to 143 food components, such as vitamins, minerals, amino acids, and fatty acids. It replaces the previous release, Tags {"food composition","nutrient compostion"}

58

Modeling Guidance for Developing Site-specific Nutrient Goals  

Science Conference Proceedings (OSTI)

One of the highest-profile challenges facing states and the regulated community is the development of scientifically sound nutrient goals, such as total maximum daily loads and site-specific numeric nutrient criteria. Goals must recognize that responses of receiving water to nutrients depend on site-specific characteristics (that is, morphology, hydrology, turbidity, temperature, etc.), all of which vary in space and time. There is a need for practical, model-based approaches and guidance for ...

2013-12-16T23:59:59.000Z

59

Vineyard nutrient needs vary with rootstocks and soils  

E-Print Network (OSTI)

drain nutrients from sandy soils. CALIFORNIA AGRICULTURE •Chardonnay on Egbert clay (sandy loam variant) soils at onewas Zinfandel on a Sierra sandy loam soil. At all three

Lambert, Jean-Jacques; Anderson, Michael M; Wolpert, J A

2008-01-01T23:59:59.000Z

60

Mercury and Other Trace Metals in Coal  

Science Conference Proceedings (OSTI)

This document summarizes the trace metal analyses of more than 150 as-received bituminous, sub-bituminous, and lignite coal samples from full-scale power plants. Analyses for mercury, arsenic, beryllium, cadmium, chromium, copper, nickel, and lead offer a benchmark for utilities to compare and contrast their own estimates and measurements of trace element content in coal.

1997-02-25T23:59:59.000Z

Note: This page contains sample records for the topic "nutrient dynamics trace" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Diagnostic tracing for wireless sensor networks  

Science Conference Proceedings (OSTI)

Wireless sensor networks are typically deployed in harsh environments, thus post-deployment failures are not infrequent. An execution trace containing events in their order of execution could play a crucial role in postmortem diagnosis of these failures. ... Keywords: Embedded debugging, diagnosis, tracing, wireless sensor networks

Vinaitheerthan Sundaram; Patrick Eugster; Xiangyu Zhang; Vamsidhar Addanki

2013-07-01T23:59:59.000Z

62

Summer cover crops and soil amendments to improve growth and nutrient uptake of okra  

Science Conference Proceedings (OSTI)

A pot experiment with summer cover crops and soil amendments was conducted in two consecutive years to elucidate the effects of these cover crops and soil amendments on 'Clemson Spineless 80' okra (Abelmoschus esculentus) yields and biomass production, and the uptake and distribution of soil nutrients and trace elements. The cover crops were sunn hemp (Crotalaria juncea), cowpea (Vigna unguiculata), velvetbean (Mucuna deeringiana), and sorghum sudan-grass (Sorghum bicolor x S. bicolor var. sudanense) with fallow as the control. The organic soil amendments were biosolids (sediment from wastewater plants), N-Viro Soil (a mixture of biosolids and coal ash), coal ash (a combustion by-product from power plants), co-compost (a mixture of 3 biosolids: 7 yard waste), and yard waste compost (mainly from leaves and branches of trees and shrubs, and grass clippings) with a soil-incorporated cover crop as the control. As a subsequent vegetable crop, okra was grown after the cover crops, alone or together with the organic soil amendments, had been incorporated. All of the cover crops, except sorghum sudangrass in 2002-03, significantly improved okra fruit yields and the total biomass production. Both cover crops and soil amendments can substantially improve nutrient uptake and distribution. The results suggest that cover crops and appropriate amounts of soil amendments can be used to improve soil fertility and okra yield without adverse environmental effects or risk of contamination of the fruit. Further field studies will be required to confirm these findings.

Wang, Q.R.; Li, Y.C.; Klassen, W. [University of Florida, Homestead, FL (United States). Center for Tropical Research & Education

2006-04-15T23:59:59.000Z

63

TBBT: scalable and accurate trace replay for file server evaluation  

Science Conference Proceedings (OSTI)

This paper describes the design, implementation, and evaluation of TBBT, the first comprehensive NFS trace replay tool. Given an NFS trace, TBBT automatically detects and repairs missing operations in the trace, derives a file system image required to ...

Ningning Zhu; Jiawu Chen; Tzi-Cker Chiueh

2005-12-01T23:59:59.000Z

64

Easy system call tracing for Plan 9.  

SciTech Connect

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.

Minnich, Ronald G.

2010-09-01T23:59:59.000Z

65

The Seasonal and Latitudinal Behavior of Trace Gases and O3 as Simulated by a Two-Dimensional Model of the Atmosphere  

Science Conference Proceedings (OSTI)

A two-dimensional zonal-mean model with parameterized dynamics and an advanced photochemical scheme is used to simulate the stratospheric distributions of atmospheric trace gases including ozone. The model calculates the distributions of 37 ...

Malcolm K. W. Ko; Nien Dak Sze; Mikhail Livshits; Michael B. McElroy; John A. Pyle

1984-08-01T23:59:59.000Z

66

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 GEOTHERMAL ENERGYGeothermal Home Conference Proceedings: TRACING...

67

Accelerating ray tracing using constrained tetrahedralizations  

Science Conference Proceedings (OSTI)

In this paper we introduce the constrained tetrahedralization as a new acceleration structure for ray tracing. A constrained tetrahedralization of a scene is a tetrahedralization that respects the faces of the scene geometry. The closest intersection ...

Ares Lagae; Philip Dutré

2008-06-01T23:59:59.000Z

68

Definition of the n-Trace - CECM  

E-Print Network (OSTI)

Nov 19, 1997 ... Definition of the n-Trace. Suppose $\\Sigma$ is a set of inputs $\\Sigma = \\{\\ alpha_1,\\alpha_2,\\alpha_3.. . Then the set $\\wp(\\Sigma)$ ...

69

Extraction of trace metals from fly ash  

DOE Patents (OSTI)

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.

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

1984-01-01T23:59:59.000Z

70

Extraction of trace metals from fly ash  

DOE Patents (OSTI)

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.

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

1983-08-15T23:59:59.000Z

71

TRACE ELEMENT ANALYSES OF URANIUM MATERIALS  

SciTech Connect

The Savannah River National Laboratory (SRNL) has developed an analytical method to measure many trace elements in a variety of uranium materials at the high part-per-billion (ppb) to low part-per-million (ppm) levels using matrix removal and analysis by quadrapole ICP-MS. Over 35 elements were measured in uranium oxides, acetate, ore and metal. Replicate analyses of samples did provide precise results however none of the materials was certified for trace element content thus no measure of the accuracy could be made. The DOE New Brunswick Laboratory (NBL) does provide a Certified Reference Material (CRM) that has provisional values for a series of trace elements. The NBL CRM were purchased and analyzed to determine the accuracy of the method for the analysis of trace elements in uranium oxide. These results are presented and discussed in the following paper.

Beals, D; Charles Shick, C

2008-06-09T23:59:59.000Z

72

Prius: generic hybrid trace compression for wireless sensor networks  

Science Conference Proceedings (OSTI)

Several diagnostic tracing techniques (e.g., event, power, and control-flow tracing) have been proposed for run-time debugging and postmortem analysis of wireless sensor networks (WSNs). Traces generated by such techniques can become large, defying the ... Keywords: compression, sensor networks, tracing

Vinaitheerthan Sundaram; Patrick Eugster; Xiangyu Zhang

2012-11-01T23:59:59.000Z

73

PowerTracer: Tracing requests in multi-tier services to save cluster power consumption  

E-Print Network (OSTI)

As energy proportional computing has extended the success of DVFS (Dynamic voltage and frequency scaling) to the entire system, DVFS control algorithms will play a key role in reducing server clusters' power consumption. The focus of this paper is to provide accurate cluster-level DVFS control for power saving in a server cluster. To achieve this goal, we propose a request tracing approach that online classifies the major causal path patterns and monitors their performance data as a guide for accurate DVFS control. The request tracing approach significantly decreases the time cost of performance profiling experiments that aim to establish the empirical performance model. Moreover, it decreases the controller complexity so that we can introduce a much simpler feedback controller, which only relies on the single-node DVFS modulation at a time as opposed to varying multiple CPU frequencies simultaneously. Based on the request tracing approach, we present a hybrid DVFS control system that combines an empirical pe...

Yuan, Lin; Sang, Bo; Wang, Lei; Wang, Haining

2010-01-01T23:59:59.000Z

74

Energy Crop Chemical Fate and Nutrient Cycling Study  

SciTech Connect

This project has demonstrated that water yield and nutrient export from 8-9 year old hybrid poplar were similar to that of 22-to 34-year-old natural mixed aspen stands in northwestern Minnesota.

J.G. Isehrands

2004-11-19T23:59:59.000Z

75

Trace Element Analysis | Open Energy Information  

Open Energy Info (EERE)

Trace Element Analysis Trace Element Analysis Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Trace Element Analysis Details Activities (8) Areas (8) Regions (4) NEPA(0) Exploration Technique Information Exploration Group: Lab Analysis Techniques Exploration Sub Group: Fluid Lab Analysis Parent Exploration Technique: Fluid Lab Analysis Information Provided by Technique Lithology: Stratigraphic/Structural: Hydrological: Reconstructing the fluid circulation of a hydrothermal system Thermal: Cost Information Low-End Estimate (USD): 15.001,500 centUSD 0.015 kUSD 1.5e-5 MUSD 1.5e-8 TUSD / element Median Estimate (USD): 18.001,800 centUSD 0.018 kUSD 1.8e-5 MUSD 1.8e-8 TUSD / element High-End Estimate (USD): 106.0010,600 centUSD 0.106 kUSD 1.06e-4 MUSD 1.06e-7 TUSD / element

76

Tracing Noble Gas Radionuclides in the Environment  

E-Print Network (OSTI)

Trace analysis of radionuclides is an essential and versatile tool in modern science and technology. Due to their ideal geophysical and geochemical properties, long-lived noble gas radionuclides, in particular, 39Ar (t1/2 = 269 yr), 81Kr (t1/2 = 2.3x10^5 yr) and 85Kr (t1/2 = 10.8 yr), have long been recognized to have a wide range of important applications in Earth sciences. In recent years, significant progress has been made in the development of practical analytical methods, and has led to applications of these isotopes in the hydrosphere (tracing the flow of groundwater and ocean water). In this article, we introduce the applications of these isotopes and review three leading analytical methods: Low-Level Counting (LLC), Accelerator Mass Spectrometry (AMS) and Atom Trap Trace Analysis (ATTA).

P. Collon; W. Kutschera; Z. -T. Lu

2004-02-11T23:59:59.000Z

77

Trace Table Based Approach for Pipelined Microprocessor Verification  

E-Print Network (OSTI)

This paper presents several techniques for formally verifying pipelined microprocessor implementations that contain out-of-order execution and dynamic resolution of data-dependent hazards. Our principal technique models the trace of executed instructions using a tablebased representation called a MAETT. We express invariant properties of pipelined implementations by specifying relations between elds in the MAETT. To show the viability of this technique, we have proved the correctness of a simple out-of-order completion pipelined microprocessor design using the ACL2 theorem prover. This verication was performed incrementally by proving that the specied relations hold for all microarchitectural states reachable from a ushed implementation state, eventually permitting us to prove that the entire pipelined machine design implements its ISA specication.

Jun Sawada; Warren A. Hunt, Jr.

1997-01-01T23:59:59.000Z

78

Nutrient Signaling, Mammalian Target of Rapamycin and Ovine Conceptus Development  

E-Print Network (OSTI)

This research was conducted to test the hypothesis that select nutrients including glucose, leucine, arginine and glutamine stimulate conceptus development by activating mTOR (mammalian target of rapamycin; HGNC approved gene name: FRAP1, FK506 binding protein 12-rapamycin associated protein 1) signaling pathway. First, temporal changes in quantities of select nutrients (glucose, amino acids, glutathione, calcium, sodium and potassium) in uterine lumenal fluid from cyclic (Days 3 to 16) and pregnant (Days 10 to 16) ewes were determined. Total recoverable glucose, Arg, Gln, Leu, Asp, Glu, Asn, His, beta-Ala, Tyr, Trp, Met, Val, Phe, Ile, Lys, Cys, Pro, glutathione, calcium and sodium was greater in uterine fluid of pregnant compared to cyclic ewes between Days 10 and 16 after onset of estrus. Of note were remarkable increases in glucose, Arg, Leu and Gln in uterine flushings of pregnant ewes between Days 10 and 16 of pregnancy. Second, effects of the estrous cycle, pregnancy, progesterone (P4) and interferon tau (IFNT) on expression of both facilitative (SLC2A1, SLC2A3 and SLC2A4) and sodium-dependent (SLC5A1 and SLC5A11) glucose transporters, cationic amino acid transporters (SLC7A1, SLC7A2 and SLC7A3), neutral amino acid transporters (SLC1A4, SLC1A5, SLC3A1, SLC6A14, SLC6A19, SLC7A5, SLC7A6, SLC7A8, SLC38A3, SLC38A6 and SLC43A2) and acidic amino acid transporters (SLC1A1, SLC1A2 and SLC1A3) in ovine uterine endometria from Days 10 to 16 of the estrous cycle and Days 10 to 20 of pregnancy as well as in conceptuses from Days 13 to 18 of pregnancy were determined. Among these genes, SLC2A3 and SLC7A6 were detectable only in trophectoderm and endoderm of conceptuses. The abundance of mRNAs for SLC2A1, SLC2A4, SLC5A1, SLC5A11, SLC7A1, SLC7A2, SLC1A4, SLC1A5, SLC43A2 and SLC1A3 changed dynamically in ovine uterine endometria according to day of the estrous cycle and early pregnancy. Expression of mRNAs for SLC2A1, SLC5A11 and SLC7A1 in endometria was induced by P4 and further stimulated by IFNT with shortterm treatment (12 days), while expression of SLC7A1 and SLC1A5 in endometria required long-term treatment (20 days) with P4 and IFNT. Third, effects of the estrous cycle, pregnancy, P4 and IFNT on expression of nitric oxide synthase (NOS1, NOS2 and NOS3), GTP cyclohydrolase (GCH1), ornithine decarboxylase 1(ODC1), insulin-like growth factor II (IGF2), FRAP1 complexes (FRAP1, LST8, MAPKAP1, RAPTOR, RICTOR), regulators (TSC1, TSC2, RHEB) and an effector (EIF4EBP1) of FRAP1 signaling in ovine uterine endometria from Days 10 to 16 of the estrous cycle and Days 10 to 20 of pregnancy as well as in conceptuses from Days 13 to 18 of pregnancy were determined. All of these genes were expressed in ovine uterine endometrium and conceptuses. Among these genes, expression of NOS1, IGF2, RHEB and EIF4EBP1 changed dynamically due to day of the estrous cycle and early pregnancy. Progesterone stimulated NOS1 and GCH1 expression while IFNT inhibited NOS1 expression in uterine endometria, and P4 and IFNT stimulated expression of RHEB and EIF4EBP1 in uterine endometria. Collectively, these results indicate that: 1) the availability of select nutrients in the ovine uterine lumen increases to support the rapid growth and elongation of the conceptus during the peri-implantation stage of pregnancy; 2) P4 and/or IFNT stimulate(s) glucose and amino acid transporters to facilitate their transport from maternal tissues and/or blood into the uterine lumen during early pregnancy; 3) the FRAP1 cell signaling pathway mediates interactions between the maternal uterus and peri-implantation conceptus and both P4 and IFNT affect this pathway by regulating expression of RHEB and EIF4EBP1. Expression of NOS, ODC1 and IGF2 appear to be linked to FRAP1 signaling in both uteri and peri-implantation conceptuses.

Gao, Haijun

2009-05-01T23:59:59.000Z

79

Building Energy Software Tools Directory: TRACE 700  

NLE Websites -- All DOE Office Websites (Extended Search)

700 700 TRACE 700 logo. Trane's TRACE 700 software - the latest version of Trane Air Conditioning Economics - brings the algorithms recommended by the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE) to the familiar Windows operating environment. Use it to assess the energy and economic impacts of building-related selections such as architectural features, comfort-system design, HVAC equipment selections, operating schedules, and financial options. Flexible data entry, coupled with multiple views and "drag-and-drop" load assignments, simplify the modeling process and help you identify optimal zoning and plant configurations. Compare up to four alternatives for a single project by modeling various air distribution and mechanical

80

Unstable Radiative–Dynamical Interactions. Part I. Basic Theory  

Science Conference Proceedings (OSTI)

The interaction between trace shortwave radiative absorbers and the dynamical circulation is shown to be linearly unstable for horizontally uniform basic states with a vertical gradient in the basic-state absorber mixing ratio. Two types of ...

Steven J. Ghan

1989-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "nutrient dynamics trace" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Title Offline Trace Synchronization for Smartphone Energy Profiling  

E-Print Network (OSTI)

Energy profiling is a means to effectively understand the power behavior of smartphone applications. However, no tool that effectively combines portability, accuracy and automation has been proposed yet. In this thesis a new approach is proposed, which sets the basis for such a tool by solving a trace synchronization problem. TRAM (TRAce Merger) uses the event trace from a mobile device and the power trace from a measurement device. It synchronizes them offline, maps the mobile device events trace on the corresponding trace from the power measurement tool, and attributes energy consumption to smartphone functionalities. The event and power traces traces from these two systems contain timestamps based on the corresponding local clocks. Taking the aforementioned clocks inaccuracy and deviation into account, we synchronize these traces to extract useful information from their contents. We achieved energy consumption attribution to smartphone functionalities by solving this synchronization problem with milliseconds accuracy.

Ioannis Oikonomidis; Offline Trace; Synchronization Smartphone; Ioannis Oikonomidis; Msc Presentation

2013-01-01T23:59:59.000Z

82

Biological trace element measurements using synchrotron radiation  

SciTech Connect

The feasibility of performing x-ray fluorescence trace element determinations at concentrations substantially below the ppM level for biological materials is demonstrated. Conditions for achieving optimum sensitivity were ascertained. Results achieved for five standard reference materials were, in most cases, in excellent agreement with listed values. Minimum detectable limits of 20 ppM were measured for most elements.

Giauque, R.D.; Jaklevic, J.M.; Thompson, A.C.

1985-07-01T23:59:59.000Z

83

Spent fuel pool analysis using TRACE code  

SciTech Connect

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)

Sanchez-Saez, F.; Carlos, S.; Villanueva, J. F.; Martorell, S. [Dept. of Chemical and Nuclear Engineering, Universitat Politenica de Valencia, Cami de Vera s/n, 46021, Valencia (Spain)

2012-07-01T23:59:59.000Z

84

Stochastic path tracing on consumer graphics cards  

Science Conference Proceedings (OSTI)

We present a path tracer using the GPU of a consumers graphics card to render images. It is implemented in Java and GLSL using GroIMP as modelling platform and runtime environment. The path tracer is capable of rendering primitives like sphere, cone, ... Keywords: GPU, HDR, global illumination, path tracing, procedural texturing, raytracing, texture mapping

Thomas Huwe; Reinhard Hemmerling

2008-04-01T23:59:59.000Z

85

Method and apparatus for determining nutrient stimulation of biological processes  

DOE Patents (OSTI)

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.

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

1999-07-13T23:59:59.000Z

86

Method and apparatus for determining nutrient stimulation of biological processes  

DOE Patents (OSTI)

A method and apparatus 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 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.

Colwell, Frederick S. (Idaho Falls, ID); Geesey, Gill G. (Bozeman, MT); Gillis, Richard J. (Bozeman, MT); Lehman, R. Michael (Idaho Falls, ID)

1999-01-01T23:59:59.000Z

87

Method and apparatus for determining nutrient stimulation of biological processes  

DOE Patents (OSTI)

A method and apparatus 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.

Colwell, Frederick S. (Idaho Falls, ID); Geesey, Gill G. (Bozeman, MT); Gillis, Richard J. (Bozeman, MT); Lehman, R. Michael (Idaho Falls, ID)

1997-01-01T23:59:59.000Z

88

Method and apparatus for determining nutrient stimulation of biological processes  

DOE Patents (OSTI)

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.

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

1997-11-11T23:59:59.000Z

89

Tracefs: a file system to trace them all  

Science Conference Proceedings (OSTI)

File system traces have been used for years to analyze user behavior and system software behavior, leading to advances in file system and storage technologies. Existing traces, however, are difficult to use because they were captured for a specific use ...

Akshat Aranya; Charles P. Wright; Erez Zadok

2004-03-01T23:59:59.000Z

90

Bunker: a privacy-oriented platform for network tracing  

Science Conference Proceedings (OSTI)

ISPs are increasingly reluctant to collect and store raw network traces because they can be used to compromise their customers' privacy. Anonymization techniques mitigate this concern by protecting sensitive information. Trace anonymization can be performed ...

Andrew G. Miklas; Stefan Saroiu; Alec Wolman; Angela Demke Brown

2009-04-01T23:59:59.000Z

91

12.479 Trace-Element Geochemistry, Fall 2006  

E-Print Network (OSTI)

Focuses on element distribution in rocks and minerals using data obtained from natural and experimental systems. Emphasizes models describing trace-element partitioning and applications of trace-element geochemistry to ...

Frey, Frederick August

92

On the privacy risks of publishing anonymized IP network traces  

Science Conference Proceedings (OSTI)

Networking researchers and engineers rely on network packet traces for understanding network behavior, developing models, and evaluating network performance. Although the bulk of published packet traces implement a form of address anonymization to hide ...

D. Koukis; S. Antonatos; K. G. Anagnostakis

2006-10-01T23:59:59.000Z

93

Comparison of nutrient data from four potential OTEC sites  

DOE Green Energy (OSTI)

An in-progress assessment of nutrient chemical data (phosphate, nitrate, nitrite, and silicate) from four potential OTEC sites (Puerto Rico, the Gulf of Mexico, Hawaii, and the South Atlantic) show reasonable comparison with archival data. At this time sufficient data is available only at the Tampa site (Gulf of Mexico) to discern seasonal variations which show an influx of nutrient-rich water in February, which decreases with time to a minimum in December. Results show a greater potential for stimulation of primary productivity at the Hawaii site than in the northern Gulf of Mexico due to the discharge of the cold water pipe into the photic zone.

Quinby-Hunt, M.S.

1979-06-01T23:59:59.000Z

94

Development of NIST Standard Reference Materials for Trace ...  

Science Conference Proceedings (OSTI)

... analytical measurements, consideration of suitable packaging, and investigation of ... provides trace levels of the plastic explosive Composition C4 ...

2012-11-16T23:59:59.000Z

95

Trace element speciation under coal fired power station conditions  

Science Conference Proceedings (OSTI)

Coal combustion from power stations is one of the largest contributors of potentially toxic trace elements to the environment. Some trace elements may be released in range of valencies, often with varying toxicity and bioavailability. Hence, determination ... Keywords: arsenic, chromium, coal combustion, mercury, selenium, speciation, trace elements

Pushan Shah; Vladimir Strezov; Peter F. Nelson

2007-05-01T23:59:59.000Z

96

Ray-tracing Procedural Displacement Shaders  

E-Print Network (OSTI)

Displacement maps and procedural displacement shaders are a widely used approach of specifying geometric detail and increasing the visual complexity of a scene. While it is relatively straightforward to handle displacement shaders in pipeline based rendering systems such as the Reyes-architecture, it is much harder to efficiently integrate displacement-mapped surfaces in ray-tracers. Many commercial ray-tracers tessellate the surface into a multitude of small triangles. This introduces a series of problems such as excessive memory consumption and possibly undetected surface detail. In this paper we describe a novel way of ray-tracing procedural displacement shaders directly, that is, without introducing intermediate geometry. Affine arithmetic is used to compute bounding boxes for the shader over any range in the parameter domain. The method is comparable to the direct ray-tracing of B'ezier surfaces and implicit surfaces using B'ezier clipping and interval methods, respectively. Keyw...

Wolfgang Heidrich; Hans-peter Seidel

1998-01-01T23:59:59.000Z

97

Mineral Nutrient Recovery from Pyrolysis Co-Products  

E-Print Network (OSTI)

Pyrolysis is the thermo-chemical degradation of biomass in an oxygen-free environment to product liquid, gaseous, and solid co-products. The liquid co-product, known as bio-oil, can be used as a transportation fuel. The gaseous co-product, known as synthesis gas, can be used to power the pyrolysis reactor or other machinery. The solid co-product, known as bio-char, has been studied as an amendment to enhance soil physical and chemical properties and nutrient status. Although previous publications have described the beneficial effects of pyrolysis bio-char on soil physical and chemical properties, relatively little has been published on the recovery of mineral nutrients from pyrolysis co-products. This work quantified the recovery of feedstock nutrients (P, K, Ca, and Mg) and micronutrients (Na, Zn, Fe, Cu, and Mn) from pyrolysis co-products from various feedstocks using three distinct pyrolysis reactor designs. The reactors comprised a laboratory-scale fixed-bed reactor and two fluidized-bed reactors located in College Station, TX and Wyndmoor, PA. Nutrient recoveries, on a feedstock basis, were calculated for a comparison of reactor efficiencies. In addition to nutrient recoveries, physical and chemical properties of input biomass and of bio-char generated by each reactor were characterized through ultimate and proximate analyses. For the fixed-bed reactor, results revealed variation among feedstocks for the recoveries of feedstock sources of macronutrients and Na, Fe, and Cu in pyrolysis co-products. Variation among species was also detected for the recoveries of feedstock sources of P, K, Ca, Mg, and Fe in pyrolysis co-products for samples pyrolyzed using the Wyndmoor reactor. For the College Station reactor, recoveries of feedstock sources of P, K, Ca, and Mg in pyrolysis co-products did not vary among species, but Zn did vary. Ultimate and proximate analyses of biomass and bio-chars generated by the three reactors revealed variation among species. Additionally, the results showed that the recovery of feedstock nutrients varied by reactor design. Statistical analysis revealed high correlations and linear relationships between the recovery of nutrients and reactor mass and energy efficiency and feedstock fiber properties.

Wise, Jatara Rob

2012-05-01T23:59:59.000Z

98

ScalaTrace: Tracing, Analysis and Modeling of HPC Codes at Scale  

Science Conference Proceedings (OSTI)

Characterizing the communication behavior of large-scale applications is a difficult and costly task due to code/system complexity and their long execution times. An alternative to running actual codes is to gather their communication traces and then replay them, which facilitates application tuning and future procurements. While past approaches lacked lossless scalable trace collection, we contribute an approach that provides orders of magnitude smaller, if not near constant-size, communication traces regardless of the number of nodes while preserving structural information. We introduce intra- and inter-node compression techniques of MPI events, we develop a scheme to preserve time and causality of communication events, and we present results of our implementation for BlueGene/L. Given this novel capability, we discuss its impact on communication tuning and on trace extrapolation. To the best of our knowledge, such a concise representation of MPI traces in a scalable manner combined with time-preserving deterministic MPI call replay are without any precedence.

Mueller, F; Wu, X; Schulz, M; de Supinski, B; Gamblin, T

2010-03-31T23:59:59.000Z

99

EOS, TRANSACTIONS, AMERICAN GEOPHYSICAL UNION Nutrient Enrichment Drives  

E-Print Network (OSTI)

During most summers over the past 30 years, bottom dissolved oxygen across a large area of the Louisiana and upper Texas continental shelf declined to concentrations too low (hypoxia) for most fish and large invertebrate animals to survive. This area is one of the best known “dead zones ” proliferating around the world [Diaz and Rosenberg, 2008]. During July 2008, hypoxic bottom waters extended across 20,720 square kilometers (Figure 1), but they were probably even more extensive because winds from Hurricane Dolly mixed the waters off Texas before the survey could be completed. Increased inputs of nutrients (principally nitrogen and phosphorus) from the U.S. agricultural heartland within the Mississippi- Atchafalaya River Basin ( MARB) are implicated in the development and spread of hypoxia in the Gulf of Mexico. Consequently, the causes of, and solutions for, hypoxia have been subjects of extensive debate and analysis. An integrated scientific assessment led to a 2001 Action Plan [Mississippi River / Gulf of Mexico Watershed Nutrient Task Force, 2001] with a goal of reducing the area of the hypoxic zone to less than 5000 square kilometers by reducing nitrogen loading [Rabalais et al., 2007]. are primarily related to nutrient fluxes from the MARB ” [SAB, 2008, p. 2]. The reconfirmed consensus is that anthropogenic nutrients stimulate the production of planktonic organic matter, the decomposition of which depletes dissolved oxygen in bottom waters on the seasonally stratified inner shelf. Despite these two major scientific assessments supporting this consensus, skeptics [Dagg et al., 2007; Bianchi et al., 2008] have suggested alternative causes of hypoxia, including (1) oxidation of organic matter not derived from phytoplankton production, (2) physical processes affecting water column stability, and (3) coastal wetland loss and river controls. This article addresses these criticisms and demonstrates why they do not challenge the consensus on nutrient enrichment. Organic Matter Sources Seasonally recurring hypoxia developed on the shelf from the 1970s through the 1990s, coinciding with a tripling of nitrate

Gulf Of Mexico Hypoxia

2009-01-01T23:59:59.000Z

100

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

E-Print Network (OSTI)

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 ...

Noble, Abigail Emery

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "nutrient dynamics trace" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

The Mid-Quaternary Climatic Transition as the Free Response of a Three-Variable Dynamical Model  

Science Conference Proceedings (OSTI)

A simplified version of a previously described dynamical model governing global ice mass, atmospheric carbon dioxide, and mean ocean temperature (that may also be a proxy for some other CO2–controlling oceanic variable, e.g., nutrient supply) is ...

Barry Saltzman; Alfonso Sutera

1987-01-01T23:59:59.000Z

102

The Structure, Dynamics, and Origin of a Small-Scale Lens of Water in the Western North Atlantic Thermocline  

Science Conference Proceedings (OSTI)

A small-scale, isolated, anticyclonically rotating lens of water was observed in the western North Atlantic thermocline during the POLYMODE Local Dynamics Experiment. Using a combination of SOFAR float, hydrographic, nutrient, and moored current ...

Stephen C. Riser; W. Brechner Owens; H. Thomas Rossby; Curtis C. Ebbesmeyer

1986-03-01T23:59:59.000Z

103

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

Science Conference Proceedings (OSTI)

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.

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

2012-08-14T23:59:59.000Z

104

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

SciTech Connect

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.

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

2012-10-24T23:59:59.000Z

105

Artificial Neural Network estimation of soil erosion and nutrient concentrations in runoff from land application areas  

Science Conference Proceedings (OSTI)

The transport of sediment and nutrients from land application areas is an environmental concern. New methods are needed for estimating soil and nutrient concentrations of runoff from cropland areas on which manure is applied. Artificial Neural Networks ... Keywords: Artificial Neural Network (ANN), Land application, Manure runoff, Nitrogen, Nutrient losses, Phosphorus, Soil erosion, Water quality

Minyoung Kim; John E. Gilley

2008-12-01T23:59:59.000Z

106

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

E-Print Network (OSTI)

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

Bhaskaran, Usha Pankajam Dr.; Varghese, Thomas Dr

2009-01-01T23:59:59.000Z

107

ScalaTrace: Scalable Compression and Replay of Communication Traces for High Performance Computing  

Science Conference Proceedings (OSTI)

Characterizing the communication behavior of large-scale applications is a difficult and costly task due to code/system complexity and long execution times. While many tools to study this behavior have been developed, these approaches either aggregate information in a lossy way through high-level statistics or produce huge trace files that are hard to handle. We contribute an approach that provides orders of magnitude smaller, if not near-constant size, communication traces regardless of the number of nodes while preserving structural information. We introduce intra- and inter-node compression techniques of MPI events that are capable of extracting an application's communication structure. We further present a replay mechanism for the traces generated by our approach and discuss results of our implementation for BlueGene/L. Given this novel capability, we discuss its impact on communication tuning and beyond. To the best of our knowledge, such a concise representation of MPI traces in a scalable manner combined with deterministic MPI call replay are without any precedent.

Noeth, M; Ratn, P; Mueller, F; Schulz, M; de Supinski, B R

2008-05-16T23:59:59.000Z

108

Trace metals in sediments of coastal Siberia  

E-Print Network (OSTI)

For the work described in this thesis, a total of 218 samples from 104 cores from the East Siberian, Laptev, Kara, and Pechora Seas and the Ob and Yenisei Rivers were analyzed for the trace metals Ag, As, Ba, Cd, Cr, Cu, Fe, Hg, Ni, Pb, Sb, and Zn. To make comparisons between locations easier, the concentration of all elements was normalized to Fe to account for variability in grain size and mineralogy. For the metals Ag, Cd, and Hg there was poor correlation with Fe, likely partially due to analytical variations caused by the low concentrations of these elements. Copper, Ni and Zn showed good correlation with Fe, suggesting these elements are from natural inputs to the sediments. Arsenic, Ba, Cr, Pb, and Sb showed variable correlations, suggesting a more mafic (basaltic) mineral phase at some locations and/or diagenetic redistribution of these metals. No statistically significant differences were found between metal to Fe ratios at the surface (0-2.5 cm) of the sediment cores and the bottoms (5- 1 00 cm), with a few exceptions. There was also no statistically significant difference in the average metal to Fe ratios of the East Siberian and Laptev Seas. There was, however, a significant difference when these two seas were compared to the Kara and Pechora Seas, suggesting different mineralogy in the drainage basins of eastern and western Siberia. Sediment from the Kara Sea was similar in trace metal concentration to sediment from its likely source, the Ob and Yenisei rivers.

Esnough, Teresa Elizabeth

1996-01-01T23:59:59.000Z

109

Compile-Time Compaction Of Traces For Memory Simulation  

E-Print Network (OSTI)

This thesis examines compile-time compaction of program execution traces. It presents a new method for compacting traces for memory simulation. Further, it describes a tool prototype that implements the method. Experiments with the tool prototype show that the new method reduces the time needed in simulating the operation of memories. Memory simulation is needed in the performance analysis and in the design of programs. In high performance applications, the data transfer between different layers of memory is one of the main bottlenecks. A program execution trace is a list of memory references. Using traces as simulation inputs is a flexible way of analyzing the memory perfor...

Vesa Hirvisalo; Vesa Hirvisalo; Dr. Tech Esko Nuutila

1998-01-01T23:59:59.000Z

110

Leaching of Trace Elements From Highway Materials Stabilized ...  

Leaching of Trace Elements From Highway Materials Stabilized with Coal Fly Ash Craig H. Benson, PhD, PE Professor, Geo Engineering Program Dept. of ...

111

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

E-Print Network (OSTI)

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 where steam tracing is applied for simple freeze protection, recently developed products which reduce the heat transfer rate and thus the energy consumption of steam tracers will be discussed. This paper will provide several steam tracing examples that will exhibit the use of experimental data, mathematical analysis, and FEA/CFD numerical simulation techniques.

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

1999-05-01T23:59:59.000Z

112

Graphics: Atmospheric Trace Gases in Whole-Air Samples  

NLE Websites -- All DOE Office Websites (Extended Search)

Graphics graphics Graphics: Atmospheric Trace Gases in Whole-Air Samples The following links are for methane, nonmethane hydrocarbons, alkyl nitrates, and chlorinated carbon...

113

Method and apparatus for detecting and measuring trace impurities in flowing gases  

SciTech Connect

Trace impurities in flowing gases may be detected and measured by a dynamic atomic molecular emission spectrograph utilizing as its energy source the energy transfer reactions of metastable species, atomic or molecular, with the impurities in the flowing gas. An electronically metastable species which maintains a stable afterglow is formed and mixed with the flowing gas in a region downstream from and separate from the region in which the metastable species is formed. Impurity levels are determined quantitatively by the measurement of line and/or band intensity as a function of concentration employing emission spectroscopic techniques.

Taylor, Gene W. (Los Alamos, NM); Dowdy, Edward J. (Los Alamos, NM)

1979-01-01T23:59:59.000Z

114

Autonomous microexplosives subsurface tracing system final report.  

SciTech Connect

The objective of the autonomous micro-explosive subsurface tracing system is to image the location and geometry of hydraulically induced fractures in subsurface petroleum reservoirs. This system is based on the insertion of a swarm of autonomous micro-explosive packages during the fracturing process, with subsequent triggering of the energetic material to create an array of micro-seismic sources that can be detected and analyzed using existing seismic receiver arrays and analysis software. The project included investigations of energetic mixtures, triggering systems, package size and shape, and seismic output. Given the current absence of any technology capable of such high resolution mapping of subsurface structures, this technology has the potential for major impact on petroleum industry, which spends approximately $1 billion dollar per year on hydraulic fracturing operations in the United States alone.

Engler, Bruce Phillip; Nogan, John; Melof, Brian Matthew; Uhl, James Eugene; Dulleck, George R., Jr.; Ingram, Brian V.; Grubelich, Mark Charles; Rivas, Raul R.; Cooper, Paul W.; Warpinski, Norman Raymond; Kravitz, Stanley H.

2004-04-01T23:59:59.000Z

115

A data distributed, parallel algorithm for ray-traced volume rendering  

Science Conference Proceedings (OSTI)

This paper presents a divide-and-conquer ray-traced volume rendering algorithm and its implementation on networked workstations and a massively parallel computer, the Connection Machine CM-5. This algorithm distributes the data and the computational load to individual processing units to achieve fast, high-quality rendering of high-resolution data, even when only a modest amount of memory is available on each machine. The volume data, once distributed, is left intact. The processing nodes perform local ray-tracing of their subvolume concurrently. No communication between processing units is needed during this locally ray-tracing process. A subimage is generated by each processing unit and the final image is obtained by compositing subimages in the proper order, which can be determined a priori. Implementations and tests on a group of networked workstations and on the Thinking Machines CM-5 demonstrate the practicality of our algorithm and expose different performance tuning issues for each platform. We use data sets from medical imaging and computational fluid dynamics simulations in the study of this algorithm.

Ma, Kwan-Liu; Painter, J.S. [Utah Univ., Salt Lake City, UT (United States). Dept. of Computer Science; Hansen, C.D.; Krogh, M.F. [Los Alamos National Lab., NM (United States)

1993-03-30T23:59:59.000Z

116

Compact, fast and robust grids for ray tracing  

Science Conference Proceedings (OSTI)

The focus of research in acceleration structures for ray tracing recently shifted from render time to time to image, the sum of build time and render time, and also the memory footprint of acceleration structures now receives more attention. In this ... Keywords: acceleration structure, grid, perfect hashing, ray tracing, row displacement compression

Ares Lagae; Philip Dutré

2008-06-01T23:59:59.000Z

117

Effect of Trace Elements on Anaerobic Digestion of Coking Wastewater  

Science Conference Proceedings (OSTI)

The pretreatment of coking wastewater using ASBR was conducted at 35? in this paper. The addition of trace elements to the anaerobic reactor has positive effect on the anaerobic treatment of coking wastewater, but too much or too little of it will ... Keywords: trace elements, anaerobic digestion, coking wastewater

Yu-ying Li; Bing Li

2009-10-01T23:59:59.000Z

118

BorderPatrol: isolating events for black-box tracing  

Science Conference Proceedings (OSTI)

Causal request traces are valuable to developers of large concurrent and distributed applications, yet difficult to obtain. Traces show how a request is processed, and can be analyzed by tools to detect performance or correctness errors and anomalous ... Keywords: black box systems, causal paths, distributed systems, performance analysis, performance debugging

Eric Koskinen; John Jannotti

2008-04-01T23:59:59.000Z

119

A Beginner's Guide to the Use of the TRACE Program  

Science Conference Proceedings (OSTI)

With deregulation increasing the number of bulk power transfers, more utility planners will be evaluating multi-area power transfer capability with programs such as EPRI's Transfer Capability Evaluation (TRACE). This manual will help TRACE users, particularly first-time users, develop their expertise with this sophisticated application.

1997-05-30T23:59:59.000Z

120

RPU: a programmable ray processing unit for realtime ray tracing  

Science Conference Proceedings (OSTI)

Recursive ray tracing is a simple yet powerful and general approach for accurately computing global light transport and rendering high quality images. While recent algorithmic improvements and optimized parallel software implementations have increased ... Keywords: hardware architecture, programmable shading, ray processing unit, ray tracing

Sven Woop; Jörg Schmittler; Philipp Slusallek

2005-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "nutrient dynamics trace" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Naive ray-tracing: A divide-and-conquer approach  

Science Conference Proceedings (OSTI)

We present an efficient ray-tracing algorithm which, for the first time, does not store any data structures when performing spatial subdivisions, and directly computes intersections inside the scene. This new algorithm is often faster than comparable ... Keywords: Ray tracing, divide-and-conquer, global illumination, rendering

Benjamin Mora

2011-10-01T23:59:59.000Z

122

Four LBA-ECO Data Sets Released from the Nutrient Dynamics Teams  

NLE Websites -- All DOE Office Websites (Extended Search)

(LBA). LBA-ECO ND-02 Cation Leaching from Forest and Pasture Soils, Para, Brazil. Data set prepared by D. Markewitz, E.A. Davidson, R.D.O. Figueiredo, P.R. Moutinho and D.C....

123

Patch Dynamics of Nutrients, Fecal Indicator Bacteria and Chlorophyll near the Tijuana River  

E-Print Network (OSTI)

suggest that solar radiation was not a significant factorto shield FIB from solar radiation, which has repeatedly

Feddersen, Falk; Franks, Peter

2013-01-01T23:59:59.000Z

124

Four LBA-ECO Data Sets Released from the Nutrient Dynamics Teams  

NLE Websites -- All DOE Office Websites (Extended Search)

in Amazonia (LBA). LBA-ECO ND-02 CO2 Flux from Soils in Forests and Pastures, Acre, Brazil: 1999-2001. Data set prepared by C.I. Salimon, E.A. Davidson, R.L. Victoria, and...

125

Timing Affects Switchgrass Production, Forage Nutritive Value, and Nutrient Removal  

E-Print Network (OSTI)

Switchgrass (Panicum virgatum L.) has potential for both bioenergy and forage. The objectives of this experiment were to: i) determine whether switchgrass could be harvested for greater nutritive value during the vegetative stage relative to early reproductive growth (boot stage); ii) compare biomass yields of switchgrass harvested once versus twice per year for bioenergy; and iii) examine effects of N fertilizer rates on harvest systems. The experiment was a randomized complete block design with a split-plot arrangement of harvest system treatments as main plot (harvest once per year after frost, harvest twice per year first at vegetative or boot stage and regrowth after frost) and nitrogen (N) fertilizer rate as subplots (0, 90, 180, and 270 kg N ha-1). Biomass yield was greatest and nutrient concentrations were least in the one-cut system. For the two-cut system, nutritive values and yields were similar. Total annual biomass increased linearly with N fertilization. Across N rates, CP concentration for the two-cut systems was 50 % greater (71 g kg-1) and ADF and NDF concentrations were 20 % lesser (465 and 856 g kg-1, respectively) than switchgrass in the one-cut system. Switchgrass harvested at vegetative through boot stage and its regrowth could provide forage of acceptable nutritive value to beef cows. However, greater nutrient removal requires appropriate soil fertility evaluation and fertilizer management for sustainable yields.

unknown authors

2013-01-01T23:59:59.000Z

126

Trace Assessment for BWR ATWS Analysis  

SciTech Connect

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.

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

2010-04-22T23:59:59.000Z

127

Tracing the Impact of Bank Liquidity Shocks  

E-Print Network (OSTI)

While bank lending may fall in response to shocks to their liquidity, to what extent are such shocks transmitted to borrowing …rms? Tracing such transmission mechanisms has proven di ¢ cult in the past due to a lack of micro data linking banks to borrowing …rms and identi…cation concerns. This paper uses di¤erential liquidity shocks arising from unanticipated nuclear tests in Pakistan in 1998, and a dataset linking over 18; 000 …rms to all 145 banks to understand the full transmission mechanism. We isolate the causal impact of the bank lending channel by showing that for the same …rm borrowing from two di¤erent banks, its loan from the bank experiencing a 1 % larger decline in liquidity drops by an additional 0.6%. The liquidity shock also leads to large declines in the probability of continued lending to old clients, and extending credit to new ones. However, we …nd that …rms di¤er in their ability to compensate the bank lending channel shock. Larger …rms, while also facing a bank lending channel, are able to o¤set the adverse e¤ect by borrowing more from more liquid banks. Smaller …rms on the other hand are entiely unable to hedge out the bank lending channels. Consequently, a negative bank liquidity shock increases the

Asim Ijaz Khwaja; Atif Mian

2006-01-01T23:59:59.000Z

128

Using RFID for tracing cumulated resources and emissions in supply chain  

Science Conference Proceedings (OSTI)

The tracing of resources and emissions has been recognised increasingly important in supply chains. The developed traceability graph enables tracing of information associated with products and their parts. Tracing in a supply chain requires the three ...

Marko Junkkari; Antti Sirkka

2011-11-01T23:59:59.000Z

129

Comparative analysis of biogas slurry and urine as sustainable nutrient sources for hydroponic vertical farming.  

E-Print Network (OSTI)

?? Sustainable alternatives to using mined nutrients in agriculture must be found in order to limit environmental impacts such as eutrophication, habitat destruction and greenhouse… (more)

Dumitrescu, Vlad Andrei

2013-01-01T23:59:59.000Z

130

Factors influencing trace element composition in human teeth  

SciTech Connect

The authors recently compiled and reviewed the literature published in or after 1978 for 45 major, minor, and trace elements in human teeth as a part of an International Atomic Energy Agency (IAEA) study. The purpose of this paper is to discuss the various factors that influence the concentration levels of certain trace elements in human teeth. The sampling practices and analytical techniques that are applicable for trace element analysis are also discussed. It is also our intention to identify reference range of values, where data permit such conclusions. The scrutiny was designed to identify only the healthy permanent teeth, and values from teeth with fillings, caries, or periodontal diseases were eliminated.

Tandon, L. [Los Alamos National Lab., NM (United States); Iyengar, G.V. [Biomineral Sciences International, Inc., Bethesda, MD (United States)

1997-12-01T23:59:59.000Z

131

Algorithms and analysis for underwater vehicle plume tracing.  

SciTech Connect

The goal of this research was to develop and demonstrate cooperative 3-D plume tracing algorithms for miniature autonomous underwater vehicles. Applications for this technology include Lost Asset and Survivor Location Systems (L-SALS) and Ship-in-Port Patrol and Protection (SP3). This research was a joint effort that included Nekton Research, LLC, Sandia National Laboratories, and Texas A&M University. Nekton Research developed the miniature autonomous underwater vehicles while Sandia and Texas A&M developed the 3-D plume tracing algorithms. This report describes the plume tracing algorithm and presents test results from successful underwater testing with pseudo-plume sources.

Byrne, Raymond Harry; Savage, Elizabeth L. (Texas A& M University, College Station, TX); Hurtado, John Edward (Texas A& M University, College Station, TX); Eskridge, Steven E.

2003-07-01T23:59:59.000Z

132

The Algorithmic Beauty of Traces Using L-systems to Hilight Patterns ...  

E-Print Network (OSTI)

Nov 19, 1997 ... Characteristics of truth tables · Visualization of truth tables · L-systems · Visualization and observations on traces · A strategy for the 3-trace case.

133

Halocarbon and Other Atmospheric Trace Species (HATS) | Data.gov  

NLE Websites -- All DOE Office Websites (Extended Search)

Halocarbon and Other Atmospheric Trace Species (HATS) Halocarbon and Other Atmospheric Trace Species (HATS) Agriculture Community Menu DATA APPS EVENTS DEVELOPER STATISTICS COLLABORATE ABOUT Agriculture You are here Data.gov » Communities » Agriculture » Data Halocarbon and Other Atmospheric Trace Species (HATS) Dataset Summary Description The general mission of the Halocarbons and other Atmospheric Trace Species group is to quantify the distributions and magnitudes of sources and sinks for atmospheric nitrous oxide (N2O) and halogen containing compounds. HATS utilizes numerous types of platforms, including ground-based stations, towers, ocean vessels, aircraft, and balloons, to accomplish its mission. For a detailed mission statement, consult our FAQ. Tags {"nitrous oxide","sulfur hexaflouride",CFC-11,CFC-12,CFC-113,CCl4,CH3CCl3,CH3Cl,halon-1211,HCFC-22,HCFC-142b,halocarbons,chromatograph,aircraft,balloons,vessels,ships,towers,"natural resources",environment,air,"GHG "}

134

Interannual Variability of Trace Gases in the Subtropical Winter Stratosphere  

Science Conference Proceedings (OSTI)

Measurements of water vapor and methane from the Halogen Occultation Experiment instrument on board the Upper Atmosphere Research Satellite are used to study the interannual variability of trace gas distributions in the atmosphere. Particular ...

L. J. Gray; J. M. Russell Jr.

1999-04-01T23:59:59.000Z

135

Traces generation to simulate large-scale distributed applications  

Science Conference Proceedings (OSTI)

In order to study the performance of scheduling algorithms, simulators of parallel and distributed applications need accurate models of the application's behavior during execution. For this purpose, traces of low-level events collected during the actual ...

Olivier Dalle; Emilio P. Mancini

2011-12-01T23:59:59.000Z

136

Trace metal particulates in coal-fired power plant emissions.  

E-Print Network (OSTI)

??Since coal-fired power plants produce approximately 50% of U.S. energy, the toxic and environmental damaging effects of this energy source are important. Trace metals are… (more)

Marett, Lanette Simone

2007-01-01T23:59:59.000Z

137

Laboratory measurements and modeling of trace atmospheric species  

E-Print Network (OSTI)

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, ...

Sheehy, Philip M. (Philip Michael)

2005-01-01T23:59:59.000Z

138

High quality rendering using ray tracing and photon mapping  

Science Conference Proceedings (OSTI)

Ray tracing and photon mapping provide a practical way of efficiently simulating global illumination including interreflections, caustics, color bleeding, participating media and subsurface scattering in scenes with complicated geometry and advanced ...

Henrik Wann Jensen; Per Christensen

2007-08-01T23:59:59.000Z

139

A strategy for the 3-trace case - CECM  

E-Print Network (OSTI)

Nov 19, 1997 ... Figure 10 shows a 3-trace on 4-atom truth table and its correspondence as an L- system. Again transitions form 1's to 0's are highlighted. Similar ...

140

Trace Impurities and Activation Products in Base Metals  

Science Conference Proceedings (OSTI)

This report documents the results of research related to the concentrations of trace impurities and activation products in stainless steel alloys used for reactor vessels and internals. While present in extremely low concentrations, these trace elements and radionuclides can impact radioactive waste disposal of the components upon decommissioning.BackgroundThe primary basis of activity in a decommissioning source term is activated metals from the reactor and ...

2012-10-30T23:59:59.000Z

Note: This page contains sample records for the topic "nutrient dynamics trace" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

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

SciTech Connect

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.

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

2012-08-28T23:59:59.000Z

142

Global Nutrient Export from WaterSheds 2 (NEWS 2): Model development and implementation  

Science Conference Proceedings (OSTI)

Global NEWS is a global, spatially explicit, multi-element and multi-form model of nutrient exports by rivers. Here we present NEWS 2, the new version of Global NEWS developed as part of a Millennium Ecosystem Assessment scenario implementation from ... Keywords: Basin models, Coastal inputs, Global NEWS, Global river exports, Millennium ecosystem assessment scenarios, Nutrients

Emilio Mayorga; Sybil P. Seitzinger; John A. Harrison; Egon Dumont; Arthur H. W. Beusen; A. F. Bouwman; Balazs M. Fekete; Carolien Kroeze; Gerard Van Drecht

2010-07-01T23:59:59.000Z

143

Nutrient Removal Rates from Ruminoretic-ula of Cattle Grazing Kansas Flint Hillsn  

E-Print Network (OSTI)

Nutrient Removal Rates from Ruminoretic- ula of Cattle Grazing Kansas Flint Hillsn fcange J- val rates of forage nutrients from Kansas Flint Hills range over a 2-year period. Rumens were emptied may indicate that optimum utilization of native Flint Hills range forage is not being achieved

Owensby, Clenton E.

144

Spin tracking simulations in AGS based on ray-tracing methods - bare lattice, no snakes -  

SciTech Connect

This Note reports on the first simulations of and spin dynamics in the AGS using the ray-tracing code Zgoubi. It includes lattice analysis, comparisons with MAD, DA tracking, numerical calculation of depolarizing resonance strengths and comparisons with analytical models, etc. It also includes details on the setting-up of Zgoubi input data files and on the various numerical methods of concern in and available from Zgoubi. Simulations of crossing and neighboring of spin resonances in AGS ring, bare lattice, without snake, have been performed, in order to assess the capabilities of Zgoubi in that matter, and are reported here. This yields a rather long document. The two main reasons for that are, on the one hand the desire of an extended investigation of the energy span, and on the other hand a thorough comparison of Zgoubi results with analytical models as the 'thin lens' approximation, the weak resonance approximation, and the static case. Section 2 details the working hypothesis : AGS lattice data, formulae used for deriving various resonance related quantities from the ray-tracing based 'numerical experiments', etc. Section 3 gives inventories of the intrinsic and imperfection resonances together with, in a number of cases, the strengths derived from the ray-tracing. Section 4 gives the details of the numerical simulations of resonance crossing, including behavior of various quantities (closed orbit, synchrotron motion, etc.) aimed at controlling that the conditions of particle and spin motions are correct. In a similar manner Section 5 gives the details of the numerical simulations of spin motion in the static case: fixed energy in the neighboring of the resonance. In Section 6, weak resonances are explored, Zgoubi results are compared with the Fresnel integrals model. Section 7 shows the computation of the {rvec n} vector in the AGS lattice and tuning considered. Many details on the numerical conditions as data files etc. are given in the Appendix Section, pages A and sqs.

Meot F.; Ahrens& #44; L.; Glenn& #44; J.; Huang& #44; H.; Luccio& #44; A.; MacKay& #44; W.W.; Roser& #44; T.; Tsoupas& #44; N.

2009-09-01T23:59:59.000Z

145

Trace element fingerprinting of ancient Chinese gold with femtosecond laser  

NLE Websites -- All DOE Office Websites (Extended Search)

Trace element fingerprinting of ancient Chinese gold with femtosecond laser Trace element fingerprinting of ancient Chinese gold with femtosecond laser ablation-inductivity coupled mass spectrometry Title Trace element fingerprinting of ancient Chinese gold with femtosecond laser ablation-inductivity coupled mass spectrometry Publication Type Journal Article Year of Publication 2009 Authors Brostoff, Lynn B., Jhanis J. Gonzalez, Paul Jett, and Richard E. Russo Journal Journal of Archeological Science Volume 36 Start Page 461 Issue 2 Pagination 461-466 Date Published 02/2009 Keywords Ancient gold, femtosecond, la-icp-ms, Trace element Abstract In this collaborative investigation, femtosecond laser ablation-inductively coupled mass spectrometry (LA-ICP-MS) was applied to the study of a remarkable group of ancient Chinese gold objects in the Smithsonian's Freer Gallery of Art and Arthur M. Sackler Gallery. Taking advantage of the superior ablation characteristics and high precision of a femtosecond 266 nm Ti:sapphire laser at Lawrence Berkeley National Laboratory, major, minor and trace element concentrations in the gold fragments were quantified. Results validate use of femtosecond LA-ICP-MS for revealing ''fingerprints'' in minute gold samples. These fingerprints allow us to establish patterns based on the association of silver, palladium and platinum that support historical, technical and stylistic relationships, and shed new light on these ancient objects.

146

Brownian dynamics determine universality of charge transport in ionic liquids  

Science Conference Proceedings (OSTI)

Broadband dielectric spectroscopy is employed to investigate charge transport in a variety of glass-forming ionic liquids over wide frequency, temperature and pressure ranges. Using a combination of Einstein, Einstein-Smoluchowski, and Langevin relations, the observed universal scaling of charge transport in ionic liquids is traced back to the dominant role of Brownian dynamics.

Sangoro, Joshua R [ORNL; Iacob, Ciprian [University of Leipzig; Mierzwa, Michal [University of Silesia, Uniwersytecka, Katowice, Poland; Paluch, Marian [University of Silesia, Uniwersytecka, Katowice, Poland; Kremer, Friedrich [University of Leipzig

2012-01-01T23:59:59.000Z

147

Building Energy Software Tools Directory: TRACE Load 700  

NLE Websites -- All DOE Office Websites (Extended Search)

Load 700 Load 700 TRACE Load 700 logo. Use TRACE Load 700 software - the building and load design modules of TRACE 700, Trane Air Conditioning Economics - to evaluate the effect of building orientation, size, shape, and mass based on hourly weather data and the resulting heat-transfer characteristics of air and moisture. To assure calculation integrity, the program uses algorithms recommended by the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE). Choose from eight different ASHRAE cooling and heating methodologies, including the Exact Transfer Function. The program encourages "what if" analyses, allowing the user to enter construction details in any order and then easily change the resulting building model as the design progresses. Multiple project views and "drag-and-drop"

148

CSIRO GASLAB Network: Individual Flask Measurements of Atmospheric Trace  

NLE Websites -- All DOE Office Websites (Extended Search)

GASLAB Network GASLAB Network CSIRO GASLAB Network: Individual Flask Measurements of Atmospheric Trace Gases (April 2003) data Data Investigators L.P. Steele, P.R. Krummel, and R.L. Langenfelds Commonwealth Scientific and Industrial Research Organisation (CSIRO) DOI 10.3334/CDIAC/atg.db1021 Data are available for four atmospheric trace gases at nine stationary sites and one moving platform (aircraft over Cape Grim, Tasmania, and Bass Strait, between the Australian continent and Tasmania). The trace gases are carbon dioxide (CO2), methane (CH4), carbon monoxide (CO), and hydrogen (H2). Measurements of δ13C from CO2 are also included in this database. The nine stationary sites are, from north to south: Alert, Canada; Shetland Islands, Scotland; Estevan Point, Canada; Mauna Loa, Hawaii; Cape Ferguson,

149

AN OVERVIEW OF TOOL FOR RESPONSE ACTION COST ESTIMATING (TRACE)  

Science Conference Proceedings (OSTI)

Tools and techniques that provide improved performance and reduced costs are important to government programs, particularly in current times. An opportunity for improvement was identified for preparation of cost estimates used to support the evaluation of response action alternatives. As a result, CH2M HILL Plateau Remediation Company has developed Tool for Response Action Cost Estimating (TRACE). TRACE is a multi-page Microsoft Excel{reg_sign} workbook developed to introduce efficiencies into the timely and consistent production of cost estimates for response action alternatives. This tool combines costs derived from extensive site-specific runs of commercially available remediation cost models with site-specific and estimator-researched and derived costs, providing the best estimating sources available. TRACE also provides for common quantity and key parameter links across multiple alternatives, maximizing ease of updating estimates and performing sensitivity analyses, and ensuring consistency.

FERRIES SR; KLINK KL; OSTAPKOWICZ B

2012-01-30T23:59:59.000Z

150

Natchez Trace Elec Power Assn | Open Energy Information  

Open Energy Info (EERE)

Natchez Trace Elec Power Assn Natchez Trace Elec Power Assn Jump to: navigation, search Name Natchez Trace Elec Power Assn Place Mississippi Utility Id 13227 Utility Location Yes Ownership C NERC Location SERC NERC SERC Yes Activity Distribution Yes References EIA Form EIA-861 Final Data File for 2010 - File1_a[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Utility Rate Schedules Grid-background.png General Service (1001 kW-5000kW) Industrial General Service (50 kW and Under) Commercial General Service (51 kW-1000 kW) Commercial Outdoor Lighting HPS 100 W Lighting Outdoor Lighting HPS 100 W Dedicated Pole Lighting Outdoor Lighting HPS 100 W Dedicated Pole & Transformer Lighting Outdoor Lighting HPS 100 W Dedicated Transformer Lighting

151

Dislocation Dynamics  

Science Conference Proceedings (OSTI)

Mar 7, 2013 ... Recent Progress in Dislocation Dynamics: Sylvie Aubry1; Athanasios Arsenlis1; Wei Cai2; Steve Fitzgerald3; 1LLNL; 2Stanford University; ...

152

Modeling plankton dynamics during a Prymnesium parvum bloom: The importance of inflows and allelopathic relationships on bloom dynamics  

E-Print Network (OSTI)

Harmful algal blooms' global amplification has driven research on growth characteristics and instigating mechanisms. These blooms prosper under diverse environmental conditions, creating challenges identifying bloom initiation. The haptophyte, Prymnesium parvum, plagues the southwestern United States with massive system disruptions and huge fish kills caused by its toxin. Despite many abiotic factors' association with P. parvum blooms, low nutrient levels stress the alga increasing toxin production, eliminating nutrient competition, and alleviating grazing pressures. This model examines the relationship between nutrient availability and P. parvum toxin production against another phytoplankton and a single grazing zooplankton, using a Monod function relating population growth rate with limiting nutrient concentrations. Sensitivity analyses emphasize plankton biological parameters most influential in accumulating biomass. The impact of toxin production on zooplankton grazing rates underscores P. parvum's need for top-down control suppression. The toxin production equation increases production when P. parvum experiences low specific growth rates from nutrient availability and low biomass. This equation is analyzed against previously published allelopathic relationships, comparing plankton reactions and bloom endurance. The model's toxin production equation proves more ecologically feasible, incorporating competing phytoplankton species' mortality and variables easily verified through laboratory experiments. Though not intended for management strategy development, the model explores and supports the proposed strategy of incorporating hydraulic flushing, pulsed and continuous inflows, to eliminate biomass accumulation. Inflows relieve stressful nutrient-limiting conditions, introducing resources affecting bloom stability and plankton community dynamics. The faster-growing competing phytoplankton gains survival advantages when inflow rates fall lower than its maximum specific growth rate, but greater than P. Parvum's, emphasizing the accurate measuring of competitors' maximum specific growth rates and identifying a dilution rate range where P. parvum loses at nutrient intake. Inflows with various nutrient levels representing different source waters from freshwater lakes were tested for impacts on plankton dynamics. Adding any hydrological effect reduced P. parvum biomass. Disruptions create disturbance, removing P. parvum's system-dominating position, allowing the phytoplankton to exceed P. parvum's density. The model highlights the importance of P. parvum's toxin's presence to maintain dominance and emphasizes flushing agitation as potential and feasible management schemes to deter bloom continuation and increase species diversity.

Hewitt, Natalie Case

2011-05-01T23:59:59.000Z

153

Canola: Chemistry, Production, Processing and UtilizationChapter 8 Meal Nutrient Composition  

Science Conference Proceedings (OSTI)

Canola: Chemistry, Production, Processing and Utilization Chapter 8 Meal Nutrient Composition Processing eChapters Processing 3915C7717C575B3A3E7B822402B32741 AOCS Press Downloadable pdf of Chapter 8 Meal Nutr

154

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

E-Print Network (OSTI)

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 ...

Sancak, Yasemin S. (Yasemin Shechner)

2010-01-01T23:59:59.000Z

155

The Formation of Labrador Sea Water. Part III: The Evolution of Oxygen and Nutrient Concentration  

Science Conference Proceedings (OSTI)

Oxygen, nutrient, and tritium concentrations observed in the western Labrador Sea in March 1976 during deep convective renewal of Labrador Sea water are analyzed to show how a newly formed water mass obtains its characteristics. Common to other ...

R. Allyn Clarke; A. R. Coote

1988-03-01T23:59:59.000Z

156

Coupling of carbon, water, and nutrient interactions in woody plant soil systems. Program and presentation summaries  

DOE Green Energy (OSTI)

This report consists of 63 abstracts of presentations made at the International Symposium of Whole-Plant Physiology - coupling of carbon, water, and nutrient interactions in woody plant soil systems held in Knoxville, Tennessee on October 6-11, 1985.

Not Available

1985-10-01T23:59:59.000Z

157

Steal Tree: low-overhead tracing of work stealing schedulers  

Science Conference Proceedings (OSTI)

Work stealing is a popular approach to scheduling task-parallel programs. The flexibility inherent in work stealing when dealing with load imbalance results in seemingly irregular computation structures, complicating the study of its runtime behavior. ... Keywords: async-finish parallelism, tracing, work-stealing schedulers

Jonathan Lifflander; Sriram Krishnamoorthy; Laxmikant V. Kale

2013-06-01T23:59:59.000Z

158

Network traces of virtual worlds: measurements and applications  

Science Conference Proceedings (OSTI)

Although network traces of virtual worlds are valuable to ISPs (Internet service providers), virtual world software developers, and research communities, they do not exist in the public domain. In this work, we implement a complete testbed to efficiently ... Keywords: traffic measurement, traffic modeling, virtual world

Yichuan Wang; Cheng-Hsin Hsu; Jatinder Pal Singh; Xin Liu

2011-02-01T23:59:59.000Z

159

Trace Metal Source Terms in Carbon Sequestration Environments  

Science Conference Proceedings (OSTI)

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.

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

2013-01-01T23:59:59.000Z

160

Trace elements in oil shale. Progress report, 1976--1979  

DOE Green Energy (OSTI)

The overall objective of the program is to evaluate the environmental and health consequences of the release of toxic trace elements (As, B, F, Mo, Se) by shale oil production and use. Some of the particularly significant results are: 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. This implies that the number of analytical determinations required of processed shales is not large. 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 ae 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. Upon oxidation a drastic lowering in pH is observed. Preliminary data indicates that this oxidation is catalyzed by bacteria. Very high levels of B and Mo are taken up in some plants growing on processed shale with and without soil cover. These amounts depend upon the process and various site specific characteristics. In general, the amounts taken up decrease with increasing soil cover. On the other hand, we have not observed significant uptake of As, Se, and F into plants. 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. In particular, most of the Cd, Se, and Cr in shale oil is associated with the organic fraction containing most of the nitrogen-containing compounds.

Chappell, W.R.

1979-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "nutrient dynamics trace" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Specification and Verification of Dynamics in Cognitive Agent Models  

E-Print Network (OSTI)

Within many domains, among which biological and cognitive areas, multiple interacting processes occur among agents with dynamics that are hard to handle. Current approaches to analyse the dynamics of such processes, often based on differential equations, are not always successful. As an alternative to differential equations, this paper presents the predicate logical Temporal Trace Language (TTL) for the formal specification and analysis of dynamic properties. This language supports the specification of both qualitative and quantitative aspects, and therefore subsumes specification languages based on differential equations. A software environment has been developed for TTL, that supports editing TTL properties and enables the formal verification of properties against a set of traces. The TTL environment proved its value in a number of projects within different domains. 1.

Tibor Bosse; Catholijn M. Jonker; Lourens Van Der Meij; Alexei Sharpanskykh; Jan Treur

2006-01-01T23:59:59.000Z

162

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

Science Conference Proceedings (OSTI)

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.

Sam Alessi; Dennis Keiser

2012-10-01T23:59:59.000Z

163

In Situ Measurements of Long-Lived Trace Gases in the Lower Stratosphere by Gas Chromatography  

Science Conference Proceedings (OSTI)

Detailed information on the four-channel Airborne Chromatograph for Atmospheric Trace Species (ACATS-IV), used to measure long-lived atmospheric trace gases, is presented. Since ACATS-IV was last described in the literature, the temporal ...

P. A. Romashkin; D. F. Hurst; J. W. Elkins; G. S. Dutton; D. W. Fahey; R. E. Dunn; F. L. Moore; R. C. Myers; B. D. Hall

2001-07-01T23:59:59.000Z

164

A validation of a ray-tracing tool used to generate bi-directional...  

NLE Websites -- All DOE Office Websites (Extended Search)

A validation of a ray-tracing tool used to generate bi-directional scattering distribution functions for complex fenestration systems Title A validation of a ray-tracing tool used...

165

The role of trace gas flux networks in biogeosciences  

SciTech Connect

Vast networks of meteorological sensors ring the globe, providing continuous measurements of an array of atmospheric state variables such as temperature, humidity, rainfall, and the concentration of carbon dioxide [New etal., 1999; Tans etal., 1996]. These measurements provide input to weather and climate models and are key to detecting trends in climate, greenhouse gases, and air pollution. Yet to understand how and why these atmospheric state variables vary in time and space, biogeoscientists need to know where, when, and at what rates important gases are flowing between the land and the atmosphere. Tracking trace gas fluxes provides information on plant or microbial metabolism and climate-ecosystem interactions. The existence of trace gas flux networks is a relatively new phenomenon, dating back to research in 1984. The first gas flux measurement networks were regional in scope and were designed to track pollutant gases such as sulfur dioxide, ozone, nitric acid, and nitrogen dioxide. Atmospheric observations and model simulations were used to infer the depositional rates of these hazardous chemicals [Fowler etal., 2009; Meyers etal., 1991]. In the late 1990s, two additional trace gas flux measurement networks emerged. One, the United States Trace Gas Network (TRAGNET), was a short-lived effort that measured trace gas emissions from the soil and plants with chambers distributed throughout the country [Ojima etal., 2000]. The other, FLUXNET, was an international endeavor that brought many regional networks together to measure the fluxes of carbon dioxide, water vapor, and sensible heat exchange with the eddy covariance technique [Baldocchi etal., 2001]. FLUXNET, which remains active today, currently includes more than 400 tower sites, dispersed across most of the world's climatic zones and biomes, with sites in North and South America, Europe, Asia, Africa, and Australia. More recently, several specialized networks have emerged, including networks dedicated to urban areas (Urban Fluxnet), nitrogen compounds in Europe (NitroEurope), and methane (MethaneNet). Technical Aspects of Flux Networks Eddy covariance flux measurements are the preferred method by which biogeoscientists measure trace gas exchange between ecosystems and the atmosphere [Baldocchi, 2003].

Baldocch, Dennis [Department of Environmental Science, Policy and Management, University of California, Berkeley,; Reichstein, Markus [Max Planck Institute for Biogeochemistry; Papale, D. [University of Tuscia; KOTEEN, LAURIE [University of California, Berkeley; VARGAS, RODRIGO [Ensenada Center for Scientific Research and Higher Education (CICESE); Agarwal, D.A [Lawrence Berkeley National Laboratory (LBNL); Cook, Robert B [ORNL

2012-01-01T23:59:59.000Z

166

Matrix Optimization for the MALDI-TOF-MS Analysis of Trace Biodiesel Components (Poster)  

SciTech Connect

Trace biodiesel components that could reduce the fuel's operability in cold weather are analyzed using MALDI-TOF mass spectrometry.

McAlpin, C. R.; Voorhees, K. J.; Alleman, T. L.; McCormick, R. L.

2009-01-01T23:59:59.000Z

167

Surface kinetic model for isotopic and trace element fractionation during precipitation of calcite from aqueous solution  

SciTech Connect

A surface reaction kinetic model is developed for predicting Ca isotope fractionation and metal/Ca ratios of calcite as a function of rate of precipitation from aqueous solution. The model is based on the requirements for dynamic equilibrium; i.e. proximity to equilibrium conditions is determined by the ratio of the net precipitation rate (R{sub p}) to the gross forward precipitation rate (R{sub f}), for conditions where ionic transport to the growing crystal surface is not rate-limiting. The value of R{sub p} has been experimentally measured under varying conditions, but the magnitude of R{sub f} is not generally known, and may depend on several factors. It is posited that, for systems with no trace constituents that alter the surface chemistry, R{sub f} can be estimated from the bulk far-from-equilibrium dissolution rate of calcite (R{sub b} or k{sub b}), since at equilibrium R{sub f} = R{sub b}, and R{sub p} = 0. Hence it can be inferred that R{sub f} {approx} R{sub p} + R{sub b}. The dissolution rate of pure calcite is measureable and is known to be a function of temperature and pH. At given temperature and pH, equilibrium precipitation is approached when R{sub p} (= R{sub f} - R{sub b}) << R{sub b}. For precipitation rates high enough that R{sub p} >> R{sub b}, both isotopic and trace element partitioning are controlled by the kinetics of ion attachment to the mineral surface, which tend to favor more rapid incorporation of the light isotopes of Ca and discriminate weakly between trace metals and Ca. With varying precipitation rate, a transition region between equilibrium and kinetic control occurs near R{sub p} {approx} R{sub b} for Ca isotopic fractionation. According to this model, Ca isotopic data can be used to estimate R{sub f} for calcite precipitation. Mechanistic models for calcite precipitation indicate that the molecular exchange rate is not constant at constant T and pH, but rather is dependent also on solution saturation state and hence R{sub p}. Allowing R{sub b} to vary as R{sub p}{sup 1/2}, consistent with available precipitation rate studies, produces a better fit to some trace element and isotopic data than a model where R{sub b} is constant. This model can account for most of the experimental data in the literature on the dependence of {sup 44}Ca/{sup 40}Ca and metal/Ca fractionation in calcite as a function of precipitation rate and temperature, and also accounts for {sup 18}O/{sup 16}O variations with some assumptions. The apparent temperature dependence of Ca isotope fractionation in calcite may stem from the dependence of R{sub b} on temperature; there should be analogous pH dependence at pH < 6. The proposed model may be valuable for predicting the behavior of isotopic and trace element fractionation for a range of elements of interest in low-temperature aqueous geochemistry. The theory presented is based on measureable thermo-kinetic parameters in contrast to models that equire hyper-fast diffusivity in near-surface layers of the solid.

DePaolo, D.

2010-10-15T23:59:59.000Z

168

Jyotish: Constructive approach for context predictions of people movement from joint Wifi/Bluetooth trace  

Science Conference Proceedings (OSTI)

It is well known that people movement exhibits a high degree of repetition since people visit regular places and make regular contacts for their daily activities. This paper presents a novel framework named Jyotish, which constructs a predictive model ... Keywords: Bluetooth trace, People movement prediction, People movement trace, Wifi trace

Long Vu; Quang Do; Klara Nahrstedt

2011-12-01T23:59:59.000Z

169

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

E-Print Network (OSTI)

TRACE METAL CONTENT OF COAL AND ASH AS DETERMINED USING SCANNINGELECTRON MICROSCOPYWITE WAVELENGTH Grand Forks, ND 58202-9018 Keywords: scanning electron microscopy, trace metals, coal analysis ABSTRACT Scanningelectron microscopy with wavelength-dispersive spectrometry has been used to measure trace metals in coal

Laughlin, Robert B.

170

A New Paradigm for Intelligent Tutoring Systems: Example-Tracing Tutors  

Science Conference Proceedings (OSTI)

The Cognitive Tutor Authoring Tools (CTAT) support creation of a novel type of tutors called example-tracing tutors. Unlike other types of ITSs (e.g., model-tracing tutors, constraint-based tutors), exampletracing tutors evaluate student behavior by ... Keywords: ITS architectures, authoring tools, behavior of tutoring systems, cognitive tutors, example-tracing tutors, programming by demonstration

Vincent Aleven; Bruce M. Mclaren; Jonathan Sewall; Kenneth R. Koedinger

2009-04-01T23:59:59.000Z

171

A Reference Based Analysis Framework for Analyzing System Call Traces  

SciTech Connect

Reference based analysis (RBA) is a novel data mining tool for exploring a test data set with respect to a reference data set. The power of RBA lies in it ability to transform any complex data type, such as symbolic sequences and multi-variate categorical data instances, into a multivariate continuous representation. The transformed representation not only allows visualization of the complex data, which cannot be otherwise visualized in its original form, but also allows enhanced anomaly detection in the transformed feature space. We demonstrate the application of the RBA framework in analyzing system call traces and show how the transformation results in improved intrusion detection performance over state of art data mining based intrusion detection methods developed for system call traces.

Chandola, Varun [ORNL; Kumar, Vipin [University of Minnesota; Boriah, Shyam [University of Minnesota

2010-01-01T23:59:59.000Z

172

Tracing And Quantifying Magmatic Carbon Discharge In Cold Groundwaters-  

Open Energy Info (EERE)

source source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Page Edit History Facebook icon Twitter icon » Tracing And Quantifying Magmatic Carbon Discharge In Cold Groundwaters- Lessons Learned From Mammoth Mountain, Usa Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Tracing And Quantifying Magmatic Carbon Discharge In Cold Groundwaters- Lessons Learned From Mammoth Mountain, Usa Details Activities (3) Areas (1) Regions (0) Abstract: A major campaign to quantify the magmatic carbon discharge in cold groundwaters around Mammoth Mountain volcano in eastern California was carried out from 1996 to 1999. The total water flow from all sampled cold springs was >=1.8_107 m3/yr draining an area that receives an estimated

173

Apparatus and Method for Ultra-Sensitive trace Analysis  

DOE Patents (OSTI)

An apparatus and method for conducting ultra-sensitive trace element and isotope analysis. The apparatus injects a sample through a fine nozzle to form an atomic beam. A DC discharge is used to elevate select atoms to a metastable energy level. These atoms are then acted on by a laser oriented orthogonally to the beam path to reduce the traverse velocity and to decrease the divergence angle of the beam. The beam then enters a Zeeman slower where a counter-propagating laser beam acts to slow the atoms down. Then select atoms are captured in a magneto-optical trap where they undergo fluorescence. A portion of the scattered photons are imaged onto a photo-detector, and the results analyzed to detect the presence of single atoms of the specific trace elements.

Lu, Zhengtian; Bailey, Kevin G.; Chen, Chun Yen; Li, Yimin; O' Connor, Thomas P.; Young, Linda

2000-01-03T23:59:59.000Z

174

Ray tracing a three dimensional scene using a grid  

DOE Patents (OSTI)

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.

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

2013-02-26T23:59:59.000Z

175

Energy Efficient Steam Trapping of Trace Heating Systems  

E-Print Network (OSTI)

Since as many as 40-60% of a plant's steam traps may be used on steam tracer lines, it is essential to select the correct, properly sized 'traps'; to optimize the efficient removal of condensate while providing maximum heat transfer to maintain desired product temperatures and greatly reduce steam losses. Factors related to achieving uniform product temperatures and maximum heat transfer rates and energy efficiency are: 1.Types and Methods used for Steam Tracing; 2. Systematic heat balance required to achieve economic tracer lengths; 3. Maximum allowable trapping distance for specific applications 4.Data important to determine condensate loads; 5. Trap selection, sizing, good installation practices, and proper maintenance. Using an engineered approach to steam trapping of trace heating systems have resulted in stable tracer line temperatures while reducing steam consumption 10-50% with minimum maintenance.

Krueger, R. G.; Wilt, G. W.

1981-01-01T23:59:59.000Z

176

Electric Utility Trace Substances Synthesis Report: Volumes 1-4  

Science Conference Proceedings (OSTI)

A comprehensive evaluation of human health risks from trace substances in electric utility stack plumes was carried out for each of 600 U.S. power plants. Emissions estimates were based on measurements at 43 units. Under realistic assumptions of exposure and plant configuration, inhalation risks were well below one in one million for increased cancer likelihood to all individuals exposed to emissions from power plants. Mercury case studies at four power plants showed health risks lower than federal guide...

1995-01-11T23:59:59.000Z

177

Electric Utility Trace Substances Synthesis Report: Volumes 1-4  

Science Conference Proceedings (OSTI)

A comprehensive evaluation of human health risks from trace substances in electric utility stack plumes was carried out for each of 600 U.S. power plants. Emissions estimates were based on measurements at 43 units. Under realistic assumptions of exposure and plant configuration, inhalation risks were well below one in one million for increased cancer likelihood to all individuals exposed to emissions from power plants. Mercury case studies at four power plants showed health risks lower than federal guide...

1995-01-10T23:59:59.000Z

178

Sampling and analysis of natural gas trace constituents  

DOE Green Energy (OSTI)

Major and minor components of natural gas are routinely analyzed by gas chromatography (GC), using a thermal conductivity (TC). The best results obtained by these methods can report no better than 0.01 mole percent of each measured component. Even the extended method of analysis by flame ionization detector (FID) can only improve on the detection limit of hydrocarbons. The gas industry needs better information on all trace constituents of natural gas, whether native or inadvertently added during gas processing that may adversely influence the operation of equipment or the safety of the consumer. The presence of arsenic and mercury in some gas deposits have now been documented in international literature as causing not only human toxicity but also damaging to the field equipment. Yet, no standard methods of sampling and analysis exist to provide this much needed information. In this paper the authors report the results of a three-year program to develop an extensive array of sampling and analysis methods for speciation and measurement of trace constituents of natural gas. A cryogenic sampler operating at near 200 K ({minus}99 F) and at pipeline pressures up to 12.4 {times} 10{sup 6}Pa (1800 psig) has been developed to preconcentrate and recover all trace constituents with boiling points above butanes. Specific analytical methods have been developed for speciating and measurement of many trace components (corresponding to US EPA air toxics) by GC-AED and GC-MS, and for determining various target compounds by other techniques. Moisture, oxygen and sulfur contents are measured on site using dedicated field instruments. Arsenic, mercury and radon are sampled by specific solid sorbents for subsequent laboratory analysis.

Attari, A.; Chao, S.

1993-09-01T23:59:59.000Z

179

Trace Metals Determination in Flue Gas Desulfurization Water  

Science Conference Proceedings (OSTI)

Flue gas desulfurization (FGD) scrubbers are used on coal-fired power plants to reduce sulfur dioxide emissions to air. While effective for this purpose, wet FGD scrubbers produce an aqueous blowdown stream that contains trace levels of metals adsorbed from flue gas. Power plant owners need to measure concentrations of these metals for purposes of process control, discharge monitoring, or design and operation of wastewater treatment systems. FGD water has proven to be a very difficult matrix to analyze a...

2009-12-28T23:59:59.000Z

180

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

E-Print Network (OSTI)

Eutrophication is an increasingly recognized threat to the health of streams and rivers in the United States. This thesis presents two studies aimed at increasing the utility of periphyton analysis as a tool for water resource managers to address 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 Periphytometers. In two additional channels, nutrients were delivered by dosing water in the channel. The data showed that nutrient delivery via diffusion elicits a significantly greater periphyton response. The use of diffusing substrates for periphyton studies remains a viable tool for some objectives, but results should be extrapolated to natural conditions with caution. In the second study, modified Matlock Periphytometers and inexpensive light meters were used to investigate the relationship between periphyton growth and light availability in two fourth-order Texas streams. The data indicate that light availability explains 91.9 percent of the variability of observed periphyton growth under control conditions, and 99.7 percent under nutrient-enriched conditions. The strong correlation suggests that efforts to address eutrophication should recognize the importance of riparian shade. Equations to predict chlorophyll-a as a function of relative light intensity are also presented.

Murawski, Matthew Thomas

2001-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "nutrient dynamics trace" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Vascular flora and gradient analysis of the Natchez Trace Parkway  

E-Print Network (OSTI)

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 genera and 2196 species in 167 families. Five collection trips were made so as to include as much of the growing season as possible (August 2004, March, May, July and October 2005). Specimens were collected from 500 sites along the Parkway as well as at 50 quadrat locations. The largest families, by species numbers, are Asteraceae (298 species), Poaceae (236 species), Cyperaceae (148 species), Fabaceae (133 species) and Rosaceae (73 species), which accounted for 40.4% of the flora. A Detrended Correspondence Analysis (DCA) and TWINSPAN analysis were performed on data collected from 49 sites along the length of the Natchez Trace Parkway (NATR). It was found that the major environmental gradient (Axis 1) affecting the species composition of the site was to be the level of disturbance. The sites with high levels of disturbance were characterized as grassland field sites, while those areas with low levels of disturbance were characterized as forested sites. The TWINSPAN analysis produced 29 groupings, of which eight were found to be valid groupings. Through the course of the study, almost 450 new species were added to the current knowledge of the Natchez Trace Parkway by the NPS. In addition, one prospective endangered species was located, which will aid the NPS in future management practices within the park.

Phillips, Nena Mae Monique

2006-08-01T23:59:59.000Z

182

Impact of disturbance on arthropod community structure: Nutrient enrichment, fire and the invasive Chinese tallow tree (Sapium sebiferum) .  

E-Print Network (OSTI)

??Invasive species, fire suppression and nutrient deposition, as distinct disturbance factors, have altered Texas prairie communities. Arthropod diversity, abundance, and community composition may be modified… (more)

[No author

2006-01-01T23:59:59.000Z

183

Management practices to improve the use efficiency of nutrients and water in a sandy soil under rice based cropping system  

E-Print Network (OSTI)

Productivity of coarse textured sandy soil and loamy sandwater and nutrients. Onattukara sandy tract is a fluvial andthe physical constraints of sandy soil and to enhance the

Bhaskaran, Usha Pankajam Dr.; S, Pushkala. Dr; A.K., Sreelatha Dr; Aparna, B Dr.

2009-01-01T23:59:59.000Z

184

The PVM 3.4 tracing facility and XPVM 1.1  

SciTech Connect

One problem in developing a parallel program is monitoring its behavior for debugging and performance tuning. This paper discusses an enhanced tracing facility and tool for PVM (Parallel Virtual Machine), a message passing library for parallel processing in a heterogeneous environment. PVM supports mixed collections of workstation clusters, shared-memory multiprocessors, and massively parallel processors. The upcoming release of PVM, Version 3.4, contains a new, improved tracing facility which provides flexible, efficient access to run-time program information. This new tracing system supports a buffering mechanism to reduce perturbation of user applications caused by tracing, and a more flexible trace event definition scheme based on a self-defining data format. The new scheme expedites collection of program execution histories and allows for integration of user-defined custom trace events. Tracing instrumentation is built into the PVM library and allows on-the-fly adjustments to each task`s trace event mask, for control over the level of tracing detail. The graphical console and monitor XPVM have also been updated for better access to the new tracing functionality. Several new views have been implemented to utilize the additional tracing information now possible, including user-defined events. XPVM system has also been optimized for better real-time monitoring.

Kohl, J.A.; Geist, G.A.

1996-08-01T23:59:59.000Z

185

Tracing Fuel Component Carbon in the Emissions from Diesel Engines  

DOE Green Energy (OSTI)

The addition of oxygenates to diesel fuel can reduce particulate emissions, but the underlying chemical pathways for the reductions are not well understood. While measurements of particulate matter (PM), unburned hydrocarbons (HC), and carbon monoxide (CO) are routine, determining the contribution of carbon atoms in the original fuel molecules to the formation of these undesired exhaust emissions has proven difficult. Renewable bio-derived fuels (ethanol or bio-diesel) containing a universal distribution of contemporary carbon are easily traced by accelerator mass spectrometry (AMS). These measurements provide general information about the emissions of bio-derived fuels. Another approach exploits synthetic organic chemistry to place {sup 14}C atoms in a specific bond position in a specific fuel molecule. The highly labeled fuel molecule is then diluted in {sup 14}C-free petroleum-derived stock to make a contemporary petroleum fuel suitable for tracing. The specific {sup 14}C atoms are then traced through the combustion event to determine whether they reside in PM, HC, CO, CO{sub 2}, or other emission products. This knowledge of how specific molecular structures produce certain emissions can be used to refine chemical-kinetic combustion models and to optimize fuel composition to reduce undesired emissions. Due to the high sensitivity of the technique and the lack of appreciable {sup 14}C in fossil fuels, fuels for AMS experiments can be labeled with modern levels of {sup 14}C and still produce a strong signal. Since the fuel is not radioactive, emission tests can be conducted in any conventional engine lab, dynamometer facility, or on the open road.

Buchholz, B A; Mueller, C J; Martin, G C; Cheng, A S E; Dibble, R W; Frantz, B R

2002-10-14T23:59:59.000Z

186

Dynamic tariffs  

SciTech Connect

The general theoretical models of dynamic tariffs, such as spot pricing, are extended in this paper to include the issues of optimal response of industrial consumers and the effect of large scale penetration of these tariffs on the utility load curve. If such tariffs are to serve their purpose consumers need to acquire the ability for flexible and dynamic response. While the hardware for this is readily available the theoretical models and software systems are not. These issues are examined and correlated with industrial site studies. A systematic analysis of the effect of significant consumer response on the system load curve is next undertaken. A methodologically sound approach to system load and price forecasting is presented.

David, A.K.; Lee, Y.C.

1989-08-01T23:59:59.000Z

187

Automated system developed to control pH and concentration of nutrient solution evaluated in hydroponic lettuce production  

Science Conference Proceedings (OSTI)

Lettuce is one of the most widely consumed leaf vegetables. In hydroponic the growth depends upon the composition of nutrient solution. Due to its nutrient absorption, the conductivity and pH suffer continuous variations. This paper describes the development ... Keywords: Automated system, Conductivity and hydroponic lettuce, pH

Diego S. Domingues; Hideaki W. Takahashi; Carlos A. P. Camara; Suzana L. Nixdorf

2012-06-01T23:59:59.000Z

188

The Meridional Oceanic Transports of Heat and Nutrients in the South Atlantic  

Science Conference Proceedings (OSTI)

Meridional transports of mass, heat, nutrients, and carbon across coast-to-coast WOCE and pre-WOCE sections between 11°S and 45°S in the South Atlantic are calculated using an inverse model. Usually salt preservation is used as a condition in the ...

Jürgen Holfort; Gerold Siedler

2001-01-01T23:59:59.000Z

189

A comprehensive GIS-based poultry litter management system for nutrient management planning and litter transportation  

Science Conference Proceedings (OSTI)

Confined poultry (broiler) production in Alabama results in about 1.8 million tons of litter annually. Because poultry production mainly occurs in the Appalachian Plateau region of north Alabama, this region suffers from excessive land application of ... Keywords: Broiler litter, Comprehensive nutrient management plan, Decision support system, Geographic information system, Poultry litter, Transportation analysis

M. S. Kang; P. Srivastava; T. Tyson; J. P. Fulton; W. F. Owsley; K. H. Yoo

2008-12-01T23:59:59.000Z

190

BIOETHANOL PRODUCTION FROM WET OXIDSED CORN STOVER USING PRE-TREATED MANURE AS A NUTRIENT SOURCE  

E-Print Network (OSTI)

BIOETHANOL PRODUCTION FROM WET OXIDSED CORN STOVER USING PRE-TREATED MANURE AS A NUTRIENT SOURCE E (sugar-, and starch-containing) raw materials represent the major part of the total production cost- linked, rigid lignocellulose complex. This structure severely limits the biological conversion; therefore

191

Pilot-Scale Fermentation and Laboratory Nutrient Studies on Mixed-Acid Fermentation  

E-Print Network (OSTI)

Via mixed-culture fermentation, the MixAlcoTM produces carboxylic acids, which are chemically converted into industrial chemicals and hydrocarbon fuels. Using pilot fermentation data, The Continuum Particle Distribution Model (CPDM) overestimated acid concentration (30–90% error) but more closely estimated conversion (50%. To analyze fermentation data with semi-continuous streams, the Slope method calculates the average flowrate of material from the slope of the moving cumulative sum with respect to time. Although the Slope method does not significantly improve accuracy, it dramatically reduces error compared to traditional techniques (>40% vs. <2%). Nutrients are essential for microbial growth and metabolism. For a four-bottle fermentation train, five nutrient contacting patterns (single-point nutrient addition to Fermentors F1, F2, F3, F4, and multi-point parallel addition) were investigated. Compared to the traditional nutrient contacting method (all nutrients fed to F1), the near-optimal feeding strategies improved exit yield, culture yield, process yield, exit acetate-equivalent yield, conversion, and total acid productivity by approximately 31%, 39%, 46%, 31%, 100%, and 19%, respectively. To estimate nitrogen concentration profiles, a segregated-nitrogen model uses separate mass balances for solid- and liquid-phase nitrogen; the nitrogen reaction flux between phases is assumed to be zero. Using five fermentation trains, each with a different nutrient contacting pattern, the model predictions capture basic behavior; therefore, it is a reasonable tool for estimating and controlling nitrogen profiles. To determine the optimal scenario for mixed-acid fermentations, an array of batch fermentations was performed that independently varied the C/N ratio and the blend of carbohydrate (office paper) and nutrient (wet chicken manure (CM)). Reactant was defined as non-acid volatile solids (NAVS). C/N ratios were based on non-acid carbon (CNA). A blend of 93% paper and 7% wet CM (dry basis) with a C/N ratio of 37 g CNA/g N had the highest culture yield (0.21 g acidproduced/g NAVSinitial), total acid productivity (0.84 g acidproduced/(Lliq·d)), and conversion (0.43 g NAVSconsumed/g NAVSinitial).

Smith, Aaron Douglas

2011-05-01T23:59:59.000Z

192

Generalized Kraus Operators and Generators of Quantum Dynamical Semigroups  

E-Print Network (OSTI)

Quantum dynamical semigroups play an important role in the description of physical processes such as diffusion, radiative decay or other non-equilibrium events. Taking strongly continuous and trace preserving semigroups into consideration, we show that, under a special criterion, the generator of such a group admits a certain generalized standard form, thereby shedding new light on known approaches in this direction. Furthermore, we illustrate our analysis in concrete examples.

Sabina Alazzawi; Bernhard Baumgartner

2013-06-19T23:59:59.000Z

193

Trace metals in heavy crude oils and tar sand bitumens  

SciTech Connect

Fe, Ni, and V are considered trace impurities in heavy crude oils and tar sand bitumens. In order to understand the importance of these metals, we have examined several properties: (1) bulk metals levels, (2) distribution in separated fractions, (3) size behavior in feeds and during processing, (4) speciation as a function of size, and (5) correlations with rheological properties. Some of the results of these studies show: (1) V and Ni have roughly bimodal size distributions, (2) groupings were seen based on location, size distribution, and Ni/V ratio of the sample, (3) Fe profiles are distinctively different, having a unimodal distribution with a maximum at relatively large molecular size, (4) Fe concentrations in the tar sand bitumens suggest possible fines solubilization in some cases, (5) SARA separated fractions show possible correlations of metals with asphaltene properties suggesting secondary and tertiary structure interactions, and (6) ICP-MS examination for soluble ultra-trace metal impurities show the possibility of unexpected elements such as U, Th, Mo, and others at concentrations in the ppB to ppM range. 39 refs., 13 figs., 5 tabs.

Reynolds, J.G.

1990-11-28T23:59:59.000Z

194

Trace Elemental Variation in Dosidicus Gigas Statoliths Using LA-ICP-MS  

E-Print Network (OSTI)

Range expansion events of the Humboldt squid reveal our inadequate understanding of populations of this species. Despite recent hatching, reproductive, tagging, genetic and dietary studies of Dosidicus gigas, much speculation remains concerning geographic migration, stock assessment and habitat preferences. This study provides evidence that statolith trace elemental variations can be useful in distinguishing among geographic populations. Specimens were collected from the Galapagos Islands, southern California, and Washington State. A dissection method was recorded and published. By using laser ablation methods, discrete measurements of 10 elements were collected at 6 to 7 ablation sites covering embryonic, paralarval, juvenile and adult stages. Analysis of Variance revealed important ontogenic elemental variations among ablation locations. Multivariate Analysis of Variance, ordination techniques and discriminant function analysis with permutation testing were all utilized to compare and characterize the variations found in elemental concentrations. Significant ontogenic variations were found for 8 out of the 10 focus elements; this is the first report for 5 of these elements for this species. The geographic populations were effectively classified as distinct group for the first time using these methods. Elemental fingerprint signatures were found to be significantly different at multiple ontogenic growth regions of the statolith. Seattle and California paralarvae exhibited similar elemental signatures despite significant differences in those found in the embryonic core and juvenile regions of the statolith. These methods are a useful tool in providing stock assessment and can be improved for use in future population dynamics models.

Arbuckle, Nancy 1980-

2012-12-01T23:59:59.000Z

195

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

SciTech Connect

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.

J. Helble; Clara Smith; David Miller

2009-08-31T23:59:59.000Z

196

Tracing the behavior of parallel applications on extreme-scale systems |  

NLE Websites -- All DOE Office Websites (Extended Search)

Tracing the behavior of parallel applications on extreme-scale systems Tracing the behavior of parallel applications on extreme-scale systems January 3, 2014 Tweet EmailPrint Event-tracing tools have proved vital for understanding how parallel applications behave. But new challenges make the use of event tracing on extreme-scale machines problematic. Tracing tools generate large amounts of data, which can overload the parallel file system and skew the application being studied. To remedy this problem, researchers from Argonne National Laboratory, the Technische Universität Dresden in Germany, and Oak Ridge National Laboratory have devised a new technique that enables event tracing on exascale systems. Scientists who have been using existing performance analysis tools find that these frequently do not scale to large systems. And even if they do

197

Laboratory Evaluation of Novel Trace Element Removal Technologies for Wet FGD Wastewater  

Science Conference Proceedings (OSTI)

Wet flue gas desulfurization (FGD) systems can remove a wide range of trace elements, such as mercury, selenium, arsenic, and others from the flue gas. Some trace elements leave the FGD system with solid byproduct streams, but a portion generally leaves as dissolved species in the FGD chloride purge stream. The U.S. Environmental Protection Agency (EPA) effluent limitation guidelines and state or local regulations generally limit the quantities of these trace species in wastewater discharges from ...

2012-12-31T23:59:59.000Z

198

Adsorption of Trace Elements on Fresh and Weathered Coal Fly Ash  

Science Conference Proceedings (OSTI)

A variety of trace elements are associated with fly ash produced by coal combustion. These trace elements are potentially of concern for human health if they are released to the environment, and thus it is important to understand their mobility in coal fly ash management settings. In the fly ash management environment, the ash may react with meteoric fluid to release trace elements into groundwater or surface water. However, fly ash particles also have a relatively high surface area and have the ability ...

2012-05-23T23:59:59.000Z

199

VBR MPEG Video Traffic Dynamic Prediction Based on the Modeling and Forecast of Time Series  

Science Conference Proceedings (OSTI)

The variable-bit-rate traffic characteristic brings a large complication to the utilization of network resources, especially bandwidth. To solve this problem, this paper proposes a dynamic prediction scheme of MPEG video traffic. We first advance an ... Keywords: MPEG, video trace, forecast, time series, ARMA

Jun Dai; Jun Li

2009-08-01T23:59:59.000Z

200

DYNAMIC SIMULATION OF MONO-TUBE CAVITY RECEIVERS FOR DIRECT STEAM GENERATION  

E-Print Network (OSTI)

-tracing study of the heat flux distribution inside the steam receiver is used to spatially refine the modelDYNAMIC SIMULATION OF MONO-TUBE CAVITY RECEIVERS FOR DIRECT STEAM GENERATION José Zapata 1 , John dish has been in operation since 2010 with a mono-tube steam cavity receiver, the SG4 system

Note: This page contains sample records for the topic "nutrient dynamics trace" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

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

E-Print Network (OSTI)

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.

Gregor Tanner

2008-03-12T23:59:59.000Z

202

A model of the AGS based on stepwise ray-tracing through the measured field maps of the main magnets  

SciTech Connect

Two-dimensional mid-plane magnetic field maps of two of the main AGS magnets were produced, from Hall probe measurements, for a series of different current settings. The analysis of these data yielded the excitation functions [1] and the harmonic coefficients [2] of the main magnets which have been used so far in all the models of the AGS. The constant increase of the computation power makes it possible today to directly use a stepwise raytracing through these measured field maps with a reasonable computation time. We describe in detail how these field maps have allowed the generation of models of the 6 different types of AGS main magnets, and how they are being handled with the Zgoubi ray-tracing code [3]. We give and discuss a number of results obtained regarding both beam and spin dynamics in the AGS, and we provide comparisons with other numerical and analytical modelling methods.

Dutheil Y.; Meot, F.; Tsoupas, N.

2012-05-20T23:59:59.000Z

203

Evaluation of the impact of contaminant on trace metal content of compost.  

E-Print Network (OSTI)

??Literature reviews indicated that batteries, ferrous, non-ferrous materials, and electronic products are major contributors of trace metals in municipal solid waste (MSW). In order to… (more)

Zhou, Lixian

2010-01-01T23:59:59.000Z

204

Emissions of trace gases and aerosols during the open combustion of biomass in the laboratory  

E-Print Network (OSTI)

J. A. Brass, and V. G. Ambrosia (1988a), Trace gas emissionsA. Brass, and V. G. Ambrosia (1988b), Particulate-emissions

McMeeking, Gavin R.

2009-01-01T23:59:59.000Z

205

Sub-microradian Surface Slope Metrology with the ALS Developmental Long Trace Profiler  

E-Print Network (OSTI)

upgraded LTP-II at the ALS Optical Metrology Laboratory,”Slope Metrology with the ALS Developmental Long TraceAdvanced Light Source (ALS) Optical Metrology Laboratory (

Yashchuk, Valeriy V.

2009-01-01T23:59:59.000Z

206

A Novel Sorbent-Based Process for High Temperature Trace Metals...  

NLE Websites -- All DOE Office Websites (Extended Search)

Sorbent-Based Process for High Temperature Trace Metals Removal from Coal-Derived Syngas Description Gasification converts coal and other heavy feedstocks into synthesis gas...

207

Emissions of trace gases and aerosols during the open combustion of biomass in the laboratory  

E-Print Network (OSTI)

in press), Organic aerosols in the earth's atmosphere,loss, and trace gas and aerosol emissions during laboratoryproperties of biomass burn aerosols, Geophysical Research

McMeeking, Gavin R.

2009-01-01T23:59:59.000Z

208

AIR QUALITY: MERCURY, TRACE ELEMENTS, AND PARTICULATE MATTER CONFERENCE  

SciTech Connect

This final report summarizes the planning/preparation, facilitation, and outcome of the conference entitled ''Air Quality: Mercury, Trace Elements, and Particulate Matter'' that was held December 1-4, 1998, in McLean, Virginia (on the outskirts of Washington, DC). The goal of the conference was to bring together industry, government, and the research community to discuss the critical issue of how air quality can impact human health and the ecosystem, specifically hazardous air pollutants and fine airborne particles; available and developing control technologies; strategies and research needs; and an update on federal and state policy and regulations, related implementation issues, and the framework of the future.

John H. Pavlish; Steven A. Benson

1999-07-01T23:59:59.000Z

209

Standoff ultraviolet raman scattering detection of trace levels of explosives.  

Science Conference Proceedings (OSTI)

Ultraviolet (UV) Raman scattering with a 244-nm laser is evaluated for standoff detection of explosive compounds. The measured Raman scattering albedo is incorporated into a performance model that focused on standoff detection of trace levels of explosives. This model shows that detection at {approx}100 m would likely require tens of seconds, discouraging application at such ranges, and prohibiting search-mode detection, while leaving open the possibility of short-range point-and-stare detection. UV Raman spectra are also acquired for a number of anticipated background surfaces: tile, concrete, aluminum, cloth, and two different car paints (black and silver). While these spectra contained features in the same spectral range as those for TNT, we do not observe any spectra similar to that of TNT.

Kulp, Thomas J.; Bisson, Scott E.; Reichardt, Thomas A.

2011-10-01T23:59:59.000Z

210

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

E-Print Network (OSTI)

The objective of this dissertation is to apply radiogenic isotopes extracted from marine sediments to investigate aspects of global climate change over the past 25 kyr, especially ocean and atmospheric circulation, continental aridity, and hydrology. By focusing on the geochemical records from marine sediments and authigenic precipitates preserved in these sediments, I aim to better understand climate forcing and feedback mechanisms, which are critical to models of climate change. Firstly, I have 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 of marine sediments along a transect across the equator at 110ºW. Results from this study suggest no glacial-Holocene difference in the mean position of the ITCZ, but a more northerly, possibly stronger, deglacial ITCZ. Secondly, I have applied Nd isotope ratios from authigenic precipitates extracted from marine sediments and those from fish debris to trace past intermediate water circulation changes on glacial-interglacial and millennial timescales. The authigenic Nd isotope record from the Florida Straits suggests a reduced circulation of Antarctic Intermediate Water (AAIW) into the tropical North Atlantic during the Younger Dryas (YD) and Heinrich 1 (H1) events, associated with a significant reduction in AMOC. However, in the Southern Caribbean, apparent deviations in the Nd isotopic compositions between the acid-reductive leachate and the fish debris suggest that the leachate method is not reliable at this location and that it needs to be tested in more detail in various oceanic settings. In the Southern Caribbean, the fish debris Nd isotope results suggest a two-step recovery of the upper North Atlantic Deep Water during the last deglaciation. Comparing our new fish debris Nd isotope data to authigenic Nd isotope data for sediments from the Florida Straits and the Demarara Rise, we propose that glacial and deglacial AAIW does not penetrate beyond the lower depth limit of modern AAIW in the tropical North Atlantic. Both studies suggest a tight connection between Atlantic intermediate water circulation variability and high-latitude North Atlantic climate change.

Xie, Ruifang

2013-05-01T23:59:59.000Z

211

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

SciTech Connect

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.

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

2009-04-01T23:59:59.000Z

212

Comparison of techniques for preserving dissolved nutrients in open-ocean seawater samples  

Science Conference Proceedings (OSTI)

A survey of recent literature on methods for preserving nutrients indicates that the major factors which have been considered are: filtration and type of filter, material and history of storage containers, the influence of light, storage temperature and how it is achieved, the effectiveness of various acids, poisons, and preservatives, and the source of the sample. No comprehensive studies of open ocean seawater were found. A comprehensive study of nutrient preservation techniques was conducted on surface and deep seawater samples collected in the Gulf Stream east of Miami, Florida. No preservation techniques were found to be satisfactory for near-surface open ocean seawater. Results for deep water samples are found to be substantially better. The degree of preservation was not substantially improved by complex techniques involving freezing and chemical additives. Storage of filtered samples in aged polyethylene bottles at 2/sup 0/C in the dark is recommended for samples that must be stored. (LEW)

Morse, J. W.; Hunt, M.; Zullig, J.; Mucci, A.; Mendez, T.

1981-12-01T23:59:59.000Z

213

Expanding the Model-Tracing Architecture: A 3rd Generation Intelligent Tutor for Algebra Symbolization  

Science Conference Proceedings (OSTI)

Following Computer Aided Instruction systems, 2nd generation tutors are Model-Tracing Tutors (MTTs) (Anderson & Pelletier, 1991) which are intelligent tutoring systems that have been very successful at aiding student learning, but have not reached the ... Keywords: Intelligent tutoring systems, algebra, model-tracing, student learning, teaching strategies

Neil T. Heffernan; Kenneth R. Koedinger; Leena Razzaq

2008-04-01T23:59:59.000Z

214

Trace Element Remediation by Free-Living and Plant-Associated Microbes  

Science Conference Proceedings (OSTI)

Plants can accumulate, detoxify, and transform trace elements present in contaminated soil and water, leading to the phytoremediation of contaminated sites. This study considers the role of plant-associated microbes in the phytoremediation of trace elements, particularly selenium (Se), in the root zone (rhizosphere) as well as the isolation and characterization of free-living microbes for Se bioremediation.

2003-11-05T23:59:59.000Z

215

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

E-Print Network (OSTI)

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

Hopkins, William A.

216

Efficient hardware implementation of Ray Tracing based on an embedded software for intersection computation  

Science Conference Proceedings (OSTI)

Parallel implementations of Ray Tracing have been enabling real time performance, as the algorithm is embarrassingly parallel. However, in order to achieve both interactivity and real time performance, the algorithm should run at a high frame rates, ... Keywords: Computer graphics, FPGA, Parallel architecture, Ray Tracing

Alexandre S. Nery, Nadia Nedjah, Felipe M. G. FrançA

2013-03-01T23:59:59.000Z

217

Measurements of Trace Gas Fluxes by MAX-DOAS In Texas City, Texas spring 2009  

E-Print Network (OSTI)

Measurements of Trace Gas Fluxes by MAX- DOAS In Texas City, Texas ­ spring 2009 Elaina Shawver and NO2 from oil refineries in Texas City, TX by utilizing the spatial inhomogeneity of trace gas/hr, respectively. Determine facility averaged fluxes of NO2, HCHO, and SO2 in Texas City Determine source specific

Collins, Gary S.

218

Parallel radio-wave propagation modeling with image-based ray tracing techniques  

Science Conference Proceedings (OSTI)

Ray tracing is a technique based on the numerical simulation of geometrical optics and the uniform theory of diffraction, two well-known approximate methods for estimating a high-frequency electromagnetic field, based on the ray theory of field propagation. ... Keywords: Load balancing, Message passing interface, Performance evaluation, Radio-wave propagation, Ray tracing, Wireless communications

T. E. Athanaileas; G. E. Athanasiadou; G. V. Tsoulos; D. I. Kaklamani

2010-12-01T23:59:59.000Z

219

LaserSPECks:: laser SPECtroscopic trace-gas sensor networks - sensor integration and applications  

Science Conference Proceedings (OSTI)

We introduce a novel laser spectroscopic trace-gas sensor platform, LaserSPECks that integrates recently developed miniature quartz-enhanced photoacoustic spectroscopy (QE-PAS) gas sensing technology. This universal platform uses infrared laser spectroscopy ... Keywords: lasers, sensors, spectroscopy, trace gas sensing

Stephen So; Farinaz Koushanfar; Anatoliy Kosterev; Frank Tittel

2007-04-01T23:59:59.000Z

220

Enabling event tracing at leadership-class scale through I/O forwarding middleware  

Science Conference Proceedings (OSTI)

Event tracing is an important tool for understanding the performance of parallel applications. As concurrency increases in leadership-class computing systems, the quantity of performance log data can overload the parallel file system, perturbing the ... Keywords: I/O forwarding, atomic append, event tracing

Thomas Ilsche; Joseph Schuchart; Jason Cope; Dries Kimpe; Terry Jones; Andreas Knüpfer; Kamil Iskra; Robert Ross; Wolfgang E. Nagel; Stephen Poole

2012-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "nutrient dynamics trace" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

SecTTS: A secure track & trace system for RFID-enabled supply chains  

Science Conference Proceedings (OSTI)

Due to the highly sensitive business information communicated within RFID-enabled supply chain networks, there is an urgent need for a secure and effective track & trace system. In this paper, we aim to design and implement a secure track & trace system ... Keywords: EPCglobal network, RFID, Relay policy, Security, Supply chains

Jie Shi; Yingjiu Li; Wei He; Darren Sim

2012-08-01T23:59:59.000Z

222

Tool for Rapid Assessment of City Energy (TRACE) | Open Energy Information  

Open Energy Info (EERE)

Tool for Rapid Assessment of City Energy (TRACE) Tool for Rapid Assessment of City Energy (TRACE) Jump to: navigation, search Tool Summary LAUNCH TOOL Name: Tool for Rapid Assessment of City Energy (TRACE) Agency/Company /Organization: Energy Sector Management Assistance Program of the World Bank Sector: Climate Focus Area: Renewable Energy, Buildings, Energy Efficiency Topics: Low emission development planning, Pathways analysis Resource Type: Training materials, Software/modeling tools User Interface: Website Website: esmap.org/esmap/TRACE Cost: Free Equivalent URI: cleanenergysolutions.org/content/tool-rapid-assessment-city-energy-tra Language: English Policies: Deployment Programs DeploymentPrograms: Technical Assistance References: TRACE[1] This tool offers cities a quick and easy way to assess their energy

223

Trace Element Analysis At Walker-Lane Transitional Zone Region (Coolbaugh,  

Open Energy Info (EERE)

Trace Element Analysis At Walker-Lane Transitional Zone Region (Coolbaugh, Trace Element Analysis At Walker-Lane Transitional Zone Region (Coolbaugh, Et Al., 2010) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Trace Element Analysis At Walker-Lane Transitional Zone Region (Coolbaugh, Et Al., 2010) Exploration Activity Details Location Walker-Lane Transition Zone Geothermal Region Exploration Technique Trace Element Analysis Activity Date Usefulness useful DOE-funding Unknown Notes "This second paper provides more detailed documentation on water and rock geochemistries and describes diagnostic major and trace element ratios and concentrations that can be used to distinguish tufa columns formed from thermal waters from those that formed from non-thermal waters." "In addition to providing a potentially diagnostic lithogeochemical tool for

224

Enabling Event Tracing at Leadership-Class Scale through I/O Forwarding Middleware  

Science Conference Proceedings (OSTI)

Event tracing is an important tool for understanding the performance of parallel applications. As concurrency increases in leadership-class computing systems, the quantity of performance log data can overload the parallel file system, perturbing the application being observed. In this work we present a solution for event tracing at leadership scales. We enhance the I/O forwarding system software to aggregate and reorganize log data prior to writing to the storage system, significantly reducing the burden on the underlying file system for this type of traffic. Furthermore, we augment the I/O forwarding system with a write buffering capability to limit the impact of artificial perturbations from log data accesses on traced applications. To validate the approach, we modify the Vampir tracing tool to take advantage of this new capability and show that the approach increases the maximum traced application size by a factor of 5x to more than 200,000 processors.

Ilsche, Thomas [Technische Universitat Dresden; Schuchart, Joseph [Technische Universitat Dresden; Cope, Joseph [Argonne National Laboratory (ANL); Kimpe, Dries [Argonne National Laboratory (ANL); Jones, Terry R [ORNL; Knuepfer, Andreas [Technische Universitat Dresden; Iskra, Kamil [Argonne National Laboratory (ANL); Ross, Robert [Argonne National Laboratory (ANL); Nagel, Wolfgang E. [Technische Universitat Dresden; Poole, Stephen W [ORNL

2012-01-01T23:59:59.000Z

225

T-720: Blue Coat Director HTTP Trace Processing Flaw Permits Cross-Site  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

0: Blue Coat Director HTTP Trace Processing Flaw Permits 0: Blue Coat Director HTTP Trace Processing Flaw Permits Cross-Site Scripting Attacks T-720: Blue Coat Director HTTP Trace Processing Flaw Permits Cross-Site Scripting Attacks September 19, 2011 - 8:45am Addthis PROBLEM Blue Coat Director HTTP Trace Processing Flaw Permits Cross-Site Scripting Attacks. PLATFORM: All versions of Director prior to 5.5.2.3 are vulnerable. ABSTRACT: A vulnerability was reported in Blue Coat Director. A remote user can conduct cross-site scripting attacks. reference LINKS: Blue Coat Advisories ID: SA62 SecurityTracker Alert ID: 1026061 Blue Coat Director 510 Blue Coat SGME 5 IMPACT ASSESSMENT: Medium Discussion: An attacker can use the HTTP TRACE method to echo malicious script back to the client as part of a Cross Site Scripting (XSS) attack. No

226

V-011: IBM Tivoli Monitoring Web Server HTTP TRACE/TRACK Support Lets  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

1: IBM Tivoli Monitoring Web Server HTTP TRACE/TRACK Support 1: IBM Tivoli Monitoring Web Server HTTP TRACE/TRACK Support Lets Remote Users Obtain Potentially Sensitive Information V-011: IBM Tivoli Monitoring Web Server HTTP TRACE/TRACK Support Lets Remote Users Obtain Potentially Sensitive Information October 26, 2012 - 6:00am Addthis PROBLEM: IBM Tivoli Monitoring Web Server HTTP TRACE/TRACK Support Lets Remote Users Obtain Potentially Sensitive Information PLATFORM: Software version: 6.2.3, 6.2.3.1 ABSTRACT: A vulnerability was reported in IBM Tivoli Monitoring. REFERENCE LINKS: IBM Support Document: 1614003 IBM Support Portal SecurityTracker Alert ID: 1027692 IMPACT ASSESSMENT: High DISCUSSION: A remote user may be able to conduct HTTP TRACE and HTTP TRACK attacks to access sensitive information from the HTTP headers.

227

Trace Element Analysis At Nw Basin & Range Region (Coolbaugh, Et Al., 2010)  

Open Energy Info (EERE)

Trace Element Analysis At Nw Basin & Range Region (Coolbaugh, Et Al., 2010) Trace Element Analysis At Nw Basin & Range Region (Coolbaugh, Et Al., 2010) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Trace Element Analysis At Nw Basin & Range Region (Coolbaugh, Et Al., 2010) Exploration Activity Details Location Northwest Basin and Range Geothermal Region Exploration Technique Trace Element Analysis Activity Date Usefulness useful DOE-funding Unknown Notes "This second paper provides more detailed documentation on water and rock geochemistries and describes diagnostic major and trace element ratios and concentrations that can be used to distinguish tufa columns formed from thermal waters from those that formed from non-thermal waters." "In addition to providing a potentially diagnostic lithogeochemical tool for

228

Identifying the requirements of an agricultural robot for sensing and adjusting soil nutrient and pH levels  

E-Print Network (OSTI)

The nutrient requirements of soils using in agriculture for crop production were examined to determine the needs of a robotic system used to detect and regulate the nutrition levels of the soil. Nitrogen, phosphorus, and ...

Teague, Nicole (Nicole Dawn)

2011-01-01T23:59:59.000Z

229

A Feasibility Study: Mining Daily Traces for Home Heating Control  

E-Print Network (OSTI)

home time and dynamically controls the HVAC system [8]. In general, automated home heating control Department of Computer Science University of Virginia {hong, whitehouse}@virginia.edu ABSTRACT HVAC systems nationwide. Recent work has been focused on auto- mated control based on occupancy prediction, where some

Whitehouse, Kamin

230

The dynamic North Florida dairy farm model: A user-friendly computerized tool for increasing profits while minimizing N leaching under varying climatic conditions  

Science Conference Proceedings (OSTI)

This paper describes the computer implementation of the Dynamic North Florida Dairy farm model (DyNoFlo Dairy). The DyNoFlo Dairy is a decision support system that integrates nutrient budgeting, crop, and optimization models created to assess nitrogen ... Keywords: Climate, Dairy, Florida, Leaching, Markov chains, Optimization, User friendly

Victor E. Cabrera; Norman E. Breuer; Peter E. Hildebrand; David Letson

2005-11-01T23:59:59.000Z

231

Excursions in Chemical Dynamics  

E-Print Network (OSTI)

2009). [118] F. A. Cotton, Chemical Applications of GroupExcursions in Chemical Dynamics by Shervin Fatehi AFall 2010 Excursions in Chemical Dynamics Copyright 2010 by

Fatehi, Shervin

2010-01-01T23:59:59.000Z

232

Turbulence transmission in parallel modified shocks using ray tracing  

E-Print Network (OSTI)

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.

Joni Tammi; Rami Vainio

2006-09-14T23:59:59.000Z

233

TRACING SAGITTARIUS STRUCTURE WITH SDSS AND SEGUE IMAGING AND SPECTROSCOPY  

Science Conference Proceedings (OSTI)

We show that the Sagittarius dwarf tidal stream can be traced with very red K/M-giant stars, selected from Sloan Digital Sky Survey (SDSS) photometry. A subset of these stars are spectroscopically confirmed with SEGUE and SDSS spectra, and the distance scale of 2MASS and SDSS M giants is calibrated to the RR Lyrae distance scale. The absolute magnitude of the K/M-giant stars at the tip of the giant branch is M{sub g{sub 0}}=-1.0. The line-of-sight velocities of the M giant and blue horizontal-branch (BHB) stars that are spatially coincident with the Sgr dwarf tidal stream are consistent with those of previous authors, reinforcing the need for new models that can explain all of the Sgr tidal debris stream observations. We estimate stellar densities along the tidal tails that can be used to help constrain future models. The K/M giant, BHB, and F-turnoff stars in the lower surface brightness tidal stream that is adjacent to the main leading Sgr dwarf tidal tail have velocities and metallicities that are similar to those of the stars in the leading tidal tail. The ratio of K/M giants to BHBs and BHBs to F-turnoff stars are also similar for both branches of the leading tidal tail. We show that there is an additional low-metallicity tidal stream near the Sgr trailing tidal tail.

Yanny, Brian [Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510 (United States); Newberg, Heidi Jo [Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute Troy, NY 12180 (United States); Johnson, Jennifer A. [Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210 (United States); Lee, Young Sun; Beers, Timothy C. [Department of Physics and Astronomy, CSCE: Center for the Study of Cosmic Evolution, and JINA: Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, MI 48824 (United States); Bizyaev, Dmitry; Brewington, Howard; Malanushenko, Elena; Malanushenko, Viktor; Oravetz, Dan; Pan, Kaike; Simmons, Audrey; Snedden, Stephanie [Apache Point Observatory, P.O. Box 59, Sunspot, NM 88349 (United States); Fiorentin, Paola Re [Department of Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana (Slovenia); Harding, Paul [Department of Astronomy, Case Western Reserve University, Cleveland, OH 44106 (United States)], E-mail: paola.refiorentin@fmf.uni-lj.si

2009-08-01T23:59:59.000Z

234

Tracing Sagittarius Structure with SDSS and SEGUE Imaging and Spectroscopy  

E-Print Network (OSTI)

We show that the Sagittarius dwarf tidal stream can be traced with very red K/M-giant stars selected from SDSS photometry. A subset of these stars are spectroscopically confirmed with SEGUE and SDSS spectra, and the distance scale of 2MASS and SDSS M giants is calibrated to the RR Lyrae distance scale. The absolute g band magnitude of the K/M-giant stars at the tip of the giant branch is M_g=-1.0. The line-of-sight velocities of the M giant and BHB stars that are spatially coincident with the Sgr dwarf tidal stream are consistent with those of previous authors, reinforcing the need for new models that can explain all of the Sgr tidal debris stream observations. We estimate stellar densities along the tidal tails that can be used to help constrain future models. The K/M-giant, BHB, and F-turnoff stars in the lower surface brightness tidal stream that is adjacent to the main leading Sgr dwarf tidal tail have velocities and metallicities that are similar to those of the stars in the leading tidal tail. The ratio...

Yanny, Brian; Johnson, Jennifer A; Lee, Young Sun; Beers, Timothy C; Bizyaev, Dmitry; Brewington, Howard; Fiorentin, Paola Re; Harding, Paul; Malanushenko, Elena; Malanushenko, Viktor; Oravetz, Dan; Pan, Kaike; Simmons, Audrey; Snedden, Stephanie

2009-01-01T23:59:59.000Z

235

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

Science Conference Proceedings (OSTI)

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.

M.Y. Shpirt; S.A. Punanova [Institute for Fossil Fuels, Moscow (Russian Federation)

2007-10-15T23:59:59.000Z

236

Wool-waste as organic nutrient source for container-grown plants  

SciTech Connect

A container experiment was conducted to test the hypothesis that uncomposted wool wastes could be used as nutrient source and growth medium constituent for container-grown plants. The treatments were: (1) rate of wool-waste application (0 or unamended control, 20, 40, 80, and 120 g of wool per 8-in. pot), (2) growth medium constituents [(2.1) wool plus perlite, (2.2) wool plus peat, and (2.3) wool plus peat plus perlite], and (3) plant species (basil and Swiss chard). A single addition of 20, 40, 80, or 120 g of wool-waste to Swiss chard (Beta vulgaris L.) and basil (Ocimum basilicum L.) in pots with growth medium provided four harvests of Swiss chard and five harvests of basil. Total basil yield from the five harvests was 1.6-5 times greater than the total yield from the unamended control, while total Swiss chard yield from the four harvests was 2-5 times greater relative to the respective unamended control. The addition of wool-waste to the growth medium increased Swiss chard and basil tissue N, and NO{sub 3}-N and NH{sub 4}-N in growth medium relative to the unamended control. Scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) microanalysis of wool fibers sampled at the end of the experiments indicated various levels of decomposition, with some fibers retaining their original surface structure. Furthermore, most of the wool fibers' surfaces contained significant concentrations of S and much less N, P, or K. SEM/EDX revealed that some plant roots grow directly on wool-waste fibers suggesting either (1) root directional growth towards sites with greater nutrient concentration and/or (2) a possible role for roots or root exudates in wool decomposition. Results from this study suggest that uncomposted wool wastes can be used as soil amendment, growth medium constituent, and nutrient source for container-grown plants.

Zheljazkov, Valtcho D. [Mississippi State University, North Mississippi Research and Extension Center, Verona, MS 38879 (United States)], E-mail: vj40@pss.msstate.edu; Stratton, Glenn W. [Department of Plant and Animal Sciences and Department of Environmental Sciences, Nova Scotia Agricultural College, Truro, NS, B2N 5E3 (Canada); Pincock, James [Department of Chemistry, Dalhousie University, Halifax, NS, B3H 4J3 (Canada); Butler, Stephanie [Department of Plant and Animal Sciences and Department of Environmental Sciences, Nova Scotia Agricultural College, Truro, NS, B2N 5E3 (Canada); Jeliazkova, Ekaterina A. [Mississippi State University, Department of Plant and Soil Sciences, Mississippi State, MS 39762 (United States); Nedkov, Nedko K. [Research Institute for Roses and Aromatic Crops, 49 Osvobojdenie Blv., Kazanluk (Bulgaria); Gerard, Patrick D. [Department of Applied Economics and Statistics, Clemson University, Clemson, SC 29634 (United States)

2009-07-15T23:59:59.000Z

237

Biomass and nutrient accumulation in young Prosopis Juliflora at Mombasa, Kenya  

SciTech Connect

Data are presented for 6-yr old P. juliflora, grown for quarry reclamation on: biomass of stems, large branches, small branches and leaves; height and volume of stems and large branches. All were calculated from regressions on based diameter. Volume was 209 cubic m/ha (stems), 75 cubic m/ha (large branches). Total biomass was 216 t/ha (77% in stems and large branches). Leaves plus small branches (22.6% of biomass) contained over 50% of the pool of nutrients N, P, K and Mg. Implications are discussed for site depletion as a result of total tree use for fuelwood and fodder. 25 references.

Maghembe, J.A.; Kariuki, E.M.; Haller, R.D.

1983-01-01T23:59:59.000Z

238

Assessing Tracer Transport Algorithms and the Impact of Vertical Resolution in a Finite-Volume Dynamical Core  

Science Conference Proceedings (OSTI)

Modeling the transport of trace gases is an essential part of any atmospheric model. The tracer transport scheme in the Community Atmosphere Model finite-volume dynamical core (CAM-FV), which is part of the National Center for Atmospheric Research’...

James Kent; Christiane Jablonowski; Jared P. Whitehead; Richard B. Rood

2012-05-01T23:59:59.000Z

239

Hydrogen and helium traces in type Ib-c supernovae  

E-Print Network (OSTI)

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.

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

2005-12-22T23:59:59.000Z

240

Y8, Stress Mapping Analysis by Ray Tracing (SMART): A New ...  

Science Conference Proceedings (OSTI)

A fine grid made out of X-ray absorbing material is placed in the path of ... Stress Mapping Analysis by Ray Tracing (SMART), to fully determine the state of stress ...

Note: This page contains sample records for the topic "nutrient dynamics trace" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Trace-Element Distribution In An Active Hydrothermal System, Roosevelt Hot  

Open Energy Info (EERE)

Trace-Element Distribution In An Active Hydrothermal System, Roosevelt Hot Trace-Element Distribution In An Active Hydrothermal System, Roosevelt Hot Springs Thermal Area, Utah Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Trace-Element Distribution In An Active Hydrothermal System, Roosevelt Hot Springs Thermal Area, Utah Details Activities (3) Areas (1) Regions (0) Abstract: Chemical interaction of thermal fluids with reservoir rock in the Roosevelt Hot Springs thermal area, Utah, has resulted in the development of characteristic trace-element dispersion patterns. Multielement analyses of surface rock samples, soil samples and drill cuttings from deep exploration wells provide a three-dimensional perspective of chemical redistribution within this structurally-controlled hot-water geothermal system. Five distinctive elemental suites of chemical enrichment are

242

Trace Element Geochemical Zoning in the Roosevelt Hot Springs Thermal Area,  

Open Energy Info (EERE)

Page Page Edit with form History Facebook icon Twitter icon » Trace Element Geochemical Zoning in the Roosevelt Hot Springs Thermal Area, Utah Jump to: navigation, search OpenEI Reference LibraryAdd to library Conference Paper: Trace Element Geochemical Zoning in the Roosevelt Hot Springs Thermal Area, Utah Abstract Chemical interaction of thermal brines with reservoir rock in the Roosevelt Hot Springs thermal area has resulted in the development of distinctive trace element signatures. Geochemical analysis of soil sample, shallow temperature gradient drill hole cuttings and deep drill hole cutting provides a three dimensional perspective of trace element distributions within the system. Distributions of As, Hg and Li provide the clearest expression of hydrothermal activity. Comparison of these distribution

243

Atom Trap Trace Analysis at ANL | U.S. DOE Office of Science (SC)  

Office of Science (SC) Website

Atom Trap Trace Analysis at ANL Atom Trap Trace Analysis at ANL Nuclear Physics (NP) NP Home About Research Facilities Science Highlights Benefits of NP Spinoff Applications Spinoff Archives SBIR/STTR Applications of Nuclear Science and Technology Funding Opportunities Nuclear Science Advisory Committee (NSAC) News & Resources Contact Information Nuclear Physics U.S. Department of Energy SC-26/Germantown Building 1000 Independence Ave., SW Washington, DC 20585 P: (301) 903-3613 F: (301) 903-3833 E: sc.np@science.doe.gov More Information » Spinoff Archives Atom Trap Trace Analysis at ANL Print Text Size: A A A RSS Feeds FeedbackShare Page Application/instrumentation: Atom Trap Trace Analysis (ATTA) to determine isotopic abundances. Developed at: Argonne National Laboratory Developed in: 1999-current

244

The Transport of Trace Chemicals by Planetary Waves in the Stratosphere. Part 1: Steady Waves  

Science Conference Proceedings (OSTI)

When dissipation is present a forced planetary wave will interact with the zonal flow in the stratosphere and cause acceleration of the zonal wind, mean-zonal diabatic heating and net transport of trace chemicals. Quasi-geostrophic scaling is ...

Robert J. Kurzeja

1981-12-01T23:59:59.000Z

245

Theoretical investigation of selected trace elements in coal gasification plants. Final report Mar 78-Nov 79  

SciTech Connect

The report gives results of a theoretical investigation of the disposition of five volatile trace elements (arsenic, boron, lead, selenium, and mercury) in SNG-producing coal gasification plants. Three coal gasification processes (dry-bottom Lurgi, Koppers-Totzek, and HYGAS) were investigated to examine the possible effects of gasifier operation conditions on the speciation of the volatile trace elements. Results of this investigation suggest that none of the trace elements considered in this study will be present in the product SNG from a coal gasification plant, but will be removed from the fuel gas by various unit operations. Results also suggest that speciation of these volatile trace elements is not significantly affected by gasifier conditions.

Hill, A.H.; Anderson, G.L.; Fleming, D.K.

1983-08-01T23:59:59.000Z

246

Inversion of long-lived trace gas emissions using combined Eulerian and Lagrangian chemical transport models  

E-Print Network (OSTI)

We present a method for estimating emissions of long-lived trace gases from a sparse global network of high-frequency observatories, using both a global Eulerian chemical transport model and Lagrangian particle dispersion ...

Manning, A. J.

247

Numerical Modeling of the Turbulent Fluxes of Chemically Reactive Trace Gases in the Atmospheric Boundary Layer  

Science Conference Proceedings (OSTI)

Turbulent fluxes of chemically reactive trace gases in the neutral atmospheric boundary layer (ABL) were simulated with a one-dimensional, coupled diffusion-chemistry model. The effects of rapid chemical reactions were included with a suite of ...

W. Gao; M. L. Wesely

1994-07-01T23:59:59.000Z

248

The Gradient Genesis of Stratospheric Trace Species in the Subtropics and around the Polar Vortex  

Science Conference Proceedings (OSTI)

Mechanisms that control the formation and decay of meridional gradients in stratospheric trace species in the subtropics and around the polar vortex are investigated using a gradient genesis equation that uses mass-weighted isentropic zonal ...

Kazuyuki Miyazaki; Toshiki Iwasaki

2008-02-01T23:59:59.000Z

249

CARIBIC—Civil Aircraft for Global Measurement of Trace Gases and Aerosols in the Tropopause Region  

Science Conference Proceedings (OSTI)

The deployment of measurement equipment in passenger aircraft for the observation of atmospheric trace constituents is described. The package of automated instruments that is installed in a one-ton-capacity aircraft freight container positioned ...

C. A. M. Brenninkmeijer; P. J. Crutzen; H. Fischer; H. Güsten; W. Hans; G. Heinrich; J. Heintzenberg; M. Hermann; T. Immelmann; D. Kersting; M. Maiss; M. Nolle; A. Pitscheider; H. Pohlkamp; D. Scharffe; K. Specht; A. Wiedensohler

1999-10-01T23:59:59.000Z

250

Turbulent Transport and Heating of Trace Heavy Ions in Hot Magnetized Plasmas  

E-Print Network (OSTI)

Scaling laws for the transport and heating of trace heavy ions in low-frequency magnetized plasma turbulence are derived and compared with direct numerical simulations. The predicted dependences of turbulent fluxes and ...

Barnes, Michael

251

Fast Time Response Tunable Diode Laser Measurements of Atmospheric Trace Gases for Eddy Correlation  

Science Conference Proceedings (OSTI)

A fast-response, atmospheric trace gas monitor, based on the principle of tunable diode laser absorption spectroscopy, has been developed for making eddy correlation measurements of dry deposition fluxes. This system, which is capable of ...

G. L. Ogram; F. J. Northrup; G. C. Edwards

1988-08-01T23:59:59.000Z

252

Trace Element Analysis At Socorro Mountain Area (Owens, Et Al., 2005) |  

Open Energy Info (EERE)

Trace Element Analysis At Socorro Mountain Area (Owens, Et Al., 2005) Trace Element Analysis At Socorro Mountain Area (Owens, Et Al., 2005) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Trace Element Analysis At Socorro Mountain Area (Owens, Et Al., 2005) Exploration Activity Details Location Socorro Mountain Area Exploration Technique Trace Element Analysis Activity Date Usefulness not indicated DOE-funding Unknown Notes In order to determine which of the faults in these regions were active and open to hydrothermal fluid circulation, we have employed selective ion geochemistry that is a new geochemical method capable of detecting anomalous concentrations for up to 47 elements transported to soils by geochemical cells or low pressure vapors. Enzyme leach and Terrasol leach are two such techniques. This method has to datae been mostly applied to

253

Worldwide Measurements of Atmospheric CO2 and Other Trace Gas Species Using Commercial Airlines  

Science Conference Proceedings (OSTI)

New automated observation systems for use in passenger aircraft to measure atmospheric carbon dioxide (CO2) and other trace species have been developed and are described in this paper. The Continuous CO2 Measuring Equipment (CME) is composed ...

T. Machida; H. Matsueda; Y. Sawa; Y. Nakagawa; K. Hirotani; N. Kondo; K. Goto; T. Nakazawa; K. Ishikawa; T. Ogawa

2008-10-01T23:59:59.000Z

254

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

E-Print Network (OSTI)

The current research program was designed to evaluate the impact of various dietary and ingredient nutrient profiles and exogenous enzyme inclusion on growth performance and energy utilization in broilers. Experiment one was designed to observe 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 performance and nutrient utilization. In experiment one, DDGS concentration was increased from 0 to 15% in 5% increments and included the addition of an NSPase enzyme. Early broiler body weight and FCR was negatively affected with increasing DDGS concentration up to 15%. The decreased growth performance was associated with a decrease in energy and nitrogen utilization as a linear decrease was observed in IDE, INDC, and AMEn. Addition of the NSPase negated many of the negative effects on nutrient utilization as improvements in all digestibility measurements were observed. Interactions were observed with DDGS concentration and NSPase inclusion as the benefit of enzyme inclusion was augmented as DDGS level increase. Experiment two evaluated different corn crops from six geographical locations in the US in an effort to determine the effects of xylanase inclusion and corn nutrient variation on growth performance and nutrient utilization. Significant differences were observed in growth performance, IDE, and AMEn in broilers when fed corn. Corn source impacted early body weights, and FCR throughout the experiment. Energy utilization was also impacted on all measured parameters, following the starter phase (day 17) and at the conclusion of the trial (day 41) by corn source. Xylanase inclusion improved FCR during the finisher phase as well as the cumulative FCR (day 1-41). Digestibility data indicates that corn source impacts the xylanase effectiveness in young broilers, as improvements were not observed in all corn types. Xylanase inclusion, however, did increase IDE and AMEn in all corn sources on day 41 of age. Data from this research program confirm that ingredient nutrient content, through the presence of ingredients with anti-nutritive properties or the incidence of varying nutrient profiles, does impact observed growth performance as related to reduced nutrient digestibility. Additionally, the inclusion of a dietary exogenous enzyme does improve energy and nitrogen digestibility in broilers, ultimately improving growth performance of broilers and improving efficiency.

Campasino, Ashley 1989-

2012-12-01T23:59:59.000Z

255

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

DOE Green Energy (OSTI)

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.

Holderman, Charlie [Kootenai Tribe of Idaho Bonners

2009-02-19T23:59:59.000Z

256

Trace component analysis of process hydrogen streams at the Wilsonville Advanced Coal Liquefaction Facility  

DOE Green Energy (OSTI)

This report summarizes subcontracted work done by the Radian Corporation to analyze trace components in process hydrogen streams at the Advanced Coal Liquefaction Facility in Wilsonville, Alabama. The data will be used to help define whether the gas streams to be treated in the hydrogen processing unit in the SRC-I Demonstration Plant will require further treatment to remove trace contaminants that could be explosive under certain conditions. 2 references.

Bronfenbrenner, J.C.

1983-09-01T23:59:59.000Z

257

Hamiltonian surface shaping with information theory and exergy#47;entropy control for collective plume tracing  

Science Conference Proceedings (OSTI)

The goal of this paper is to design and analyse distributed decentralised control laws for a team of robots performing collective plume tracing based on Hamiltonian surface shaping, information theory, and exergy/entropy control. The process ... Keywords: Fisher information, Hamiltonian systems, collective plume tracing, collective systems, decentralised control, distributed control, entropy control, exergy control, information theory, kinetic control, robot collaboration, robot control, robot kinematics, robots, surface shaping

Rush D. Robinett, III; David G. Wilson

2010-01-01T23:59:59.000Z

258

Correlation between some selected trace metal concentrations in six species of fish from the Arabian Sea  

Science Conference Proceedings (OSTI)

The role of trace metals in marine ecosystems has been keenly investigated during recent years. It is known that abundance of essential trace metals regulates the metal content in the organisms by homeostatic control mechanisms, which when cease to function cause essential trace metals to act in an either acutely or chronically toxic manner. Therefore, a correlation study based on essential and non-essential trace metal concentrations is imperative for extending the existing knowledge of bioaccumulation of trace metals in marine organisms. An attempt has been made in the present investigation to bring out quantitative correlations between the concentrations of iron, copper, lead and zinc in the edible muscle tissue of six species of marine fish: Salmon (salmon sole); tuna (thunnus thynnus); pomfret silver (pampus argenteus); Pomfret black (formioniger); long tail tuna (thynnus tonggel) and Indian oil sardine (sardinella longiceps). These fish are abundantly available in Pakistan along the coastal line of the Arabian Sea and have great commercial value. The computational analysis on the trace metal correlation was conducted using an MSTAT statistical package.

Ashraf, M.; Jaffar, M.

1988-07-01T23:59:59.000Z

259

Long-term anaerobic digestion of food waste stabilized by trace elements  

SciTech Connect

Highlights: Black-Right-Pointing-Pointer Korean food waste was found to contain low level of trace elements. Black-Right-Pointing-Pointer Stable anaerobic digestion of food waste was achieved by adding trace elements. Black-Right-Pointing-Pointer Iron played an important role in anaerobic digestion of food waste. Black-Right-Pointing-Pointer Cobalt addition further enhanced the process performance in the presence of iron. - Abstract: The purpose of this study was to examine if long-term anaerobic digestion of food waste in a semi-continuous single-stage reactor could be stabilized by supplementing trace elements. Contrary to the failure of anaerobic digestion of food waste alone, stable anaerobic digestion of food waste was achieved for 368 days by supplementing trace elements. Under the conditions of OLR (organic loading rates) of 2.19-6.64 g VS (volatile solid)/L day and 20-30 days of HRT (hydraulic retention time), a high methane yield (352-450 mL CH{sub 4}/g VS{sub added}) was obtained, and no significant accumulation of volatile fatty acids was observed. The subsequent investigation on effects of individual trace elements (Co, Fe, Mo and Ni) showed that iron was essential for maintaining stable methane production. These results proved that the food waste used in this study was deficient in trace elements.

Zhang Lei, E-mail: wxzyfx@yahoo.com [Key Laboratory of Industrial Ecology and Environmental Engineering, School of Environmental Science and Technology, Dalian University of Technology, Linggong Road 2, Dalian 116024 (China); Jahng, Deokjin, E-mail: djahng@mju.ac.kr [Department of Environmental Engineering and Biotechnology, Myongji University, San 38-2, Namdong, Cheoin-Gu, Yongin, Gyeonggi-Do 449-728 (Korea, Republic of)

2012-08-15T23:59:59.000Z

260

Chemical Sensing for Buried Landmines - Fundamental Processes Influencing Trace Chemical Detection  

SciTech Connect

Mine detection dogs have a demonstrated capability to locate hidden objects by trace chemical detection. Because of this capability, demining activities frequently employ mine detection dogs to locate individual buried landmines or for area reduction. The conditions appropriate for use of mine detection dogs are only beginning to emerge through diligent research that combines dog selection/training, the environmental conditions that impact landmine signature chemical vapors, and vapor sensing performance capability and reliability. This report seeks to address the fundamental soil-chemical interactions, driven by local weather history, that influence the availability of chemical for trace chemical detection. The processes evaluated include: landmine chemical emissions to the soil, chemical distribution in soils, chemical degradation in soils, and weather and chemical transport in soils. Simulation modeling is presented as a method to evaluate the complex interdependencies among these various processes and to establish conditions appropriate for trace chemical detection. Results from chemical analyses on soil samples obtained adjacent to landmines are presented and demonstrate the ultra-trace nature of these residues. Lastly, initial measurements of the vapor sensing performance of mine detection dogs demonstrates the extreme sensitivity of dogs in sensing landmine signature chemicals; however, reliability at these ultra-trace vapor concentrations still needs to be determined. Through this compilation, additional work is suggested that will fill in data gaps to improve the utility of trace chemical detection.

PHELAN, JAMES M.

2002-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "nutrient dynamics trace" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Drum-boiler dynamics  

Science Conference Proceedings (OSTI)

A nonlinear dynamic model for natural circulation drum-boilers is presented. The model describes the complicated dynamics of the drum, downcomer, and riser components. It is derived from first principles, and is characterized by a few physical parameters. ...

K. J. íStröM; R. D. Bell

2000-03-01T23:59:59.000Z

262

Dynamic Residential Window prototype  

NLE Websites -- All DOE Office Websites (Extended Search)

to have dynamic seasonal solar control: high solar gains in the winter with high insulation and low solar gains in the summer. Dynamic, high performance products can be based...

263

General Dynamics, Electric Boat  

Science Conference Proceedings (OSTI)

General Dynamics, Electric Boat. NVLAP Lab Code: 100560-0. Address and Contact Information: 75 Eastern Point Road ...

2013-08-16T23:59:59.000Z

264

NIST Photovoltaic carrier dynamics  

Science Conference Proceedings (OSTI)

... carrier dynamics in novel electronic photovoltaic materials being considered and developed for future solar cell and energy capture applications. ...

2013-04-01T23:59:59.000Z

265

ADVANCED GASIFICATION MERCURY/TRACE METAL CONTROL WITH MONOLITH TRAPS  

SciTech Connect

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.

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

2010-07-31T23:59:59.000Z

266

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

DOE Green Energy (OSTI)

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.

Holderman, Charles

2009-02-19T23:59:59.000Z

267

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

Science Conference Proceedings (OSTI)

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.

Not Available

1980-01-01T23:59:59.000Z

268

Automated Tracing and Segmentation Tool for Migrating Neurons in 4D Confocal Imagery  

Science Conference Proceedings (OSTI)

Accurate tracing and segmentation of subcellular components of migrating neurons in confocal image sequences are prerequisite steps in many neurobiology studies to understand the biological machinery behind the movement of developing neurons. In this paper, we present an automated tracking, tracing, and segmentation tool for soma, leading, and trailing process of migrating neurons in time-lapse image stacks acquired with a confocal fluorescence microscope. In our approach, we first localize each neuron in the maximum intensity projection of the first frame using manual labeling of the soma and end points of the leading and trailing process. By using each soma position at the first frame, we automatically track the somas in rest of the frames. Then, leading and trailing process are traced in each frame from the soma center to the labeled end tip of the process by using fast marching algorithm. Finally, the soma, leading and trailing processes of each neuron are segmented by using the soma center and traces as seed points, and their boundaries are separated from each other. Based on qualitative results, we demonstrate the capability to automatically track, trace, and segment the soma, leading, and trailing processes of a migrating neuron with minimal user input.

Karakaya, Mahmut [ORNL; Kerekes, Ryan A [ORNL; Solecki, Dr. David [St. Jude Children's Research Hospital

2013-01-01T23:59:59.000Z

269

Langevin molecular dynamics derived from Ehrenfest dynamics  

E-Print Network (OSTI)

Stochastic Langevin molecular dynamics for nuclei is derived from quantum classical molecular dynamics, also called Ehrenfest dynamics, at positive temperature, assuming that the molecular bulk system is in equilibrium and that the initial data for the electrons is stochastically perturbed from the ground state. The initial electron probability distribution is derived from the Liouville equilibrium solution generated by the nuclei acting as a heat bath for the electrons. The diffusion and friction coefficients in the Langevin equation satisfy Einstein's fluctuation-dissipation relation. The fluctuating initial data yields, in addition to the fluctuating diffusion terms, also a contribution to the drift, modifying the standard ab initio Born-Oppenheimer solution at zero temperature, where the electrons are in their ground state for the current nuclear configuration. The dissipative friction mechanism comes from the evolution of the electron ground state, due to slow dynamics of the nuclei, while the modified d...

Szepessy, Anders

2007-01-01T23:59:59.000Z

270

AVESTAR® - Dynamic Modeling  

NLE Websites -- All DOE Office Websites (Extended Search)

Dynamic Modeling Dynamic Modeling The AVESTAR team is pursuing research on the dynamic modeling and simulation of advanced energy systems ranging from power plants to power grids. Dynamic models provide a continuous view of energy systems in action by calculating their transient behavior over time. Plant-wide Models For power plants, dynamic models are used to analyze a wide variety of operating scenarios, including normal base load operation, startup, shutdown, feedstock switchovers, cycling, and load-following. Dynamic process and control models are also essential for analyzing plant responses to setpoint changes and disturbances, as well as malfunctions and abnormal situations. Other applications of plant-wide dynamic models include controllability and operational flexibility analyses, environmental studies, safety evaluations, and risk mitigation.

271

ETHANOL PRODUCTION FROM DIFFERENT CARBON SOURCES USING ANAEROBICALLY DIGESTED AND WETOXIDISED MANURE AS NUTRIENT AND WATER SUPPLY  

E-Print Network (OSTI)

ETHANOL PRODUCTION FROM DIFFERENT CARBON SOURCES USING ANAEROBICALLY DIGESTED AND WETOXIDISED. The nutrients in anaerobically digested manure are sufficient for yeast fermentation, which means that the cost at 121o C was chosen as the most suitable method for pretreating anaerobically digested manure. Moreover

272

Estimating catchment-scale impacts of wildfire on sediment and nutrient loads using the E2 catchment modelling framework  

Science Conference Proceedings (OSTI)

Approximately 1.3 million ha of forested and agricultural land in south-eastern Australia was burnt by wildfires in early 2003. This paper describes a modelling process to assess the impacts of the fires on the quality of receiving waters and river systems ... Keywords: Catchment modelling, E2, Nutrient loads, Sediment loads, Water quality, Wildfire

Paul M. Feikema; Gary J. Sheridan; Robert M. Argent; Patrick N. J. Lane; Rodger B. Grayson

2011-07-01T23:59:59.000Z

273

Determination of Trace Element Concentrations at an Eastern Bituminous Coal Plant Employing an SCR and Wet FGD  

Science Conference Proceedings (OSTI)

Previous sampling has shown that air pollution control devices can have a significant impact on mercury and other trace elements. For example, selective catalytic reduction (SCR) can substantially increase the percentage of oxidized mercury that can then be removed by a wet flue gas desulfurization (FGD) system. The electrostatic precipitator (ESP) also readily captures most of the trace elements of interest. The emission of these trace elements is then directly related to the overall particulate collect...

2008-08-12T23:59:59.000Z

274

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

E-Print Network (OSTI)

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 11 cross-shelf (normal to bathymetry) transects from the Mississippi River Delta to Tampa Bay. The transects covered the shelf from the 10-m to the 1000-m isobath. In all three summers of 1998, 1999, and 2000, eddies over the continental margin induced strong, eastward anticyclonic flows over the outer shelf and slope. This flow strongly affected the distribution of coastal water on the shelf in all three years, drawing Mississippi River water into the circulation along the 1000-m isobath and reversing the normal offshore salinity gradient. The entrainment of low salinity river water resulted in anomalously high nutrient and chlorophyll a concentrations in the upper 10-20 m over the outer shelf and upper slope. This is in contrast to the typically low standing stocks of phytoplankton that occur over deep water in subtropical summertime conditions. Vertical nutrient distributions indicated that there was uplift of mid-depth water to shallower depth caused by the presence of either cyclones, regions of diverging flow at eddy peripheries, or bottom Ekman layer transport. Comparison of near-surface nutrient distributions in the low salinity entrainment features with those in the region of uplifted mid-depth water showed that the intrusion of an anticyclonic secondary eddy onto this subtropical continental margin caused deep water rich in nutrients to rise to depths as shallow as 35 or 10 m depending on the location and the intensity of the anticyclonic and cyclonic eddies. Thus, the impact of both Mississippi River water and anticyclonic and cyclonic eddies on nutrient distribution may be important in enhancing productivity over the study region during summer. On average, during each summer, the amount of nitrate reaching the outer shelf and slope in the nutrient-depleted, low-salinity river water transported by eddy circulation, provided 15 to 32 % as much nitrate as came from uplifted mid-depth water from either cyclones, diverging flow at eddy peripheries, or bottom Ekman layer transport.

Belabbassi, Leila

2001-01-01T23:59:59.000Z

275

Chemical Structure and Dynamics annual report 1997  

SciTech Connect

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.

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

1998-03-01T23:59:59.000Z

276

Trace Element Analysis At Northern Basin & Range Region (Coolbaugh, Et Al.,  

Open Energy Info (EERE)

At Northern Basin & Range Region (Coolbaugh, Et Al., At Northern Basin & Range Region (Coolbaugh, Et Al., 2010) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Trace Element Analysis At Northern Basin & Range Region (Coolbaugh, Et Al., 2010) Exploration Activity Details Location Northern Basin and Range Geothermal Region Exploration Technique Trace Element Analysis Activity Date Usefulness useful DOE-funding Unknown Notes "This second paper provides more detailed documentation on water and rock geochemistries and describes diagnostic major and trace element ratios and concentrations that can be used to distinguish tufa columns formed from thermal waters from those that formed from non-thermal waters." "In addition to providing a potentially diagnostic lithogeochemical tool for

277

TRACING FLUID SOURCES IN THE COSO GEOTHERMAL SYSTEM USING FLUID-INCLUSION  

Open Energy Info (EERE)

TRACING FLUID SOURCES IN THE COSO GEOTHERMAL SYSTEM USING FLUID-INCLUSION TRACING FLUID SOURCES IN THE COSO GEOTHERMAL SYSTEM USING FLUID-INCLUSION GAS CHEMISTRY Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Proceedings: TRACING FLUID SOURCES IN THE COSO GEOTHERMAL SYSTEM USING FLUID-INCLUSION GAS CHEMISTRY Details Activities (1) Areas (1) Regions (0) Abstract: Vein and alteration assemblages from eight Coso wells have been collected and their fluid-inclusion gases analyzed by quadrupole mass spectrometry. Four major types of alteration were sampled: 1) young calcite-hematite-pyrite veins; 2) wairakite or epidote veins and alteration that are spatially associated with deep reservoirs in the main field and eastern wells; 3) older sericite and pyrite wallrock alteration; and 4) stilbite-calcite veins that are common in cooler or marginal portions of

278

Trace Element Analysis At Roosevelt Hot Springs Area (Christensen, Et Al.,  

Open Energy Info (EERE)

Christensen, Et Al., Christensen, Et Al., 1983) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Trace Element Analysis At Roosevelt Hot Springs Area (Christensen, Et Al., 1983) Exploration Activity Details Location Roosevelt Hot Springs Area Exploration Technique Trace Element Analysis Activity Date Usefulness useful DOE-funding Unknown Notes Three of the recognized trace-element suites are characteristic of the surface and near-surface environment. These are: (1) concentrations of As, Sb, Be and Hg associated with siliceous material at the location of liquid discharge, fluid mixing, or at boiling interfaces; (2) deposits of Mn and Fe oxides containing concentrations of Ba, W, Be, Co, Cu, As, Sb and Hg formed by the oxidation of cooled brines; and (3) high concentrations of Hg

279

Patterns in the Cosmos Trace Evolution of the Universe | U.S. DOE Office of  

NLE Websites -- All DOE Office Websites (Extended Search)

Patterns in the Cosmos Trace Evolution of the Universe Patterns in the Cosmos Trace Evolution of the Universe High Energy Physics (HEP) HEP Home About Research Facilities Science Highlights Benefits of HEP Funding Opportunities Advisory Committees News & Resources Contact Information High Energy Physics U.S. Department of Energy SC-25/Germantown Building 1000 Independence Ave., SW Washington, DC 20585 P: (301) 903-3624 F: (301) 903-2597 E: sc.hep@science.doe.gov More Information » August 2013 Patterns in the Cosmos Trace Evolution of the Universe Detection of subtle polarization patterns in the Cosmic Microwave Background opens a new window on fundamental physics and cosmology. Print Text Size: A A A Subscribe FeedbackShare Page Click to enlarge photo. Enlarge Photo Image courtesy of Stephen Hoover (SPT Team member)

280

Trace Element Analysis At Central Nevada Seismic Zone Region (Coolbaugh, Et  

Open Energy Info (EERE)

Coolbaugh, Et Coolbaugh, Et Al., 2010) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Trace Element Analysis At Central Nevada Seismic Zone Region (Coolbaugh, Et Al., 2010) Exploration Activity Details Location Central Nevada Seismic Zone Geothermal Region Exploration Technique Trace Element Analysis Activity Date Usefulness useful DOE-funding Unknown Notes "This second paper provides more detailed documentation on water and rock geochemistries and describes diagnostic major and trace element ratios and concentrations that can be used to distinguish tufa columns formed from thermal waters from those that formed from non-thermal waters." "In addition to providing a potentially diagnostic lithogeochemical tool for geothermal exploration, the analysis of lithium and other elements in tufa

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281

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

DOE Data Explorer (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

282

Maps and inverse maps in open quantum dynamics  

Science Conference Proceedings (OSTI)

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 cannot have an inverse that is obtained from any dynamics described by any unitary operator for any states of a larger system.

Jordan, Thomas F., E-mail: tjordan@d.umn.ed [Physics Department, University of Minnesota, Duluth, MN 55812 (United States)

2010-10-15T23:59:59.000Z

283

Dynamic Deferral of Workload for Capacity Provisioning in Data Centers  

E-Print Network (OSTI)

Recent increase in energy prices has led researchers to find better ways for capacity provisioning in data centers to reduce energy wastage due to the variation in workload. This paper explores the opportunity for cost saving and proposes a novel approach for capacity provisioning under bounded latency requirements for the workload. We investigate how many servers to be kept active and how much workload to be delayed for energy saving while meeting every deadline. We present an offline LP formulation for capacity provisioning by dynamic deferral and give two online algorithms to determine the capacity of the data center and the assignment of workload to servers dynamically. We prove the feasibility of the online algorithms and show that their worst case performance are bounded by a constant factor with respect to the offline formulation. We validate our algorithms on synthetic workload generated from two real HTTP traces and show that they actually perform much better in practice than the worst case, resultin...

Adnan, Muhammad Abdullah; Sugihara, Ryo; Gupta, Rajesh

2011-01-01T23:59:59.000Z

284

Ray tracing a three-dimensional scene using a hierarchical data structure  

SciTech Connect

Ray tracing a three-dimensional scene made up of geometric primitives that are spatially partitioned into a hierarchical data structure. One example embodiment is a method for ray tracing a three-dimensional scene made up of geometric primitives that are spatially partitioned into a hierarchical data structure. In this example embodiment, the hierarchical data structure includes at least a parent node and a corresponding plurality of child nodes. The method includes a first act of determining that a first active ray in the packet hits the parent node and a second act of descending to each of the plurality of child nodes.

Wald, Ingo; Boulos, Solomon; Shirley, Peter

2012-09-04T23:59:59.000Z

285

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

Science Conference Proceedings (OSTI)

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.

Wang, Dali [ORNL; Domke, Jens [ORNL

2011-01-01T23:59:59.000Z

286

Life cycles on earth complicate climate research studies of trace gases  

SciTech Connect

The Exchange of Trace Gases between Atmosphere and Biosphere was the theme of the 57th workshop held by the Dahlem Conferences of the Stifterverband fuer die Deutsche Wissenschaft (Donors Association for the Promotion of Arts and Sciences in Germany), in which the experts focused their attention on the trace gases methane (CH{sub 4}) and the nitrous oxides (N{sub 2}O, NO, NO{sub 2}). Although these substances only exist in minute quantities in comparison to carbon dioxide, they contribute just as much to the greenhouse effect.

1989-08-01T23:59:59.000Z

287

Trace metal uptake and accumulation pathways in Kemp's ridley sea turtles (Lepidochelys kempii)  

E-Print Network (OSTI)

Little is known of trace metal concentrations and their possible role in the mortality of critically endangered Kemp??s ridley sea turtles (Lepidochelys kempii). Research described herein characterized concentrations of seven trace metals ?? Ag, Cd, 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 of 127 wild Kemp??s ridleys captured from the Gulf of Mexico and southeast Atlantic during 2000 to 2002. Blood, carapace, liver, kidney, and muscle tissues from live and/or stranded Kemp??s ridleys were analyzed for the aforementioned trace metals via graphite furnace atomic absorption spectrophotometer and cold vapor atomic fluorescence techniques conducted under class-100 clean laboratory conditions. Similar trace metal assessments were conducted on blue crab (Callinectes sapidus) prey to determine the role of food as a possible uptake pathway in Kemp??s ridleys. Overall, trace metal levels in live, captive as well as wild ridleys were higher in carapace tissue than in blood. Carapace concentrations of Ag, Cr and Hg in Kemp??s ridleys across all post-pelagic life stages increased with increasing straight carapace length (SCL). Carapace tissue of wild ridleys exhibited higher Cr, Hg, and Pb levels than their blue crab prey, regardless of study area; whereas, crabs yielded higher Ag and Cu concentrations. Dead stranded ridleys yielded higher Ag, Cr, Hg, Pb, Zn levels in carapace tissue, whereas, their liver exhibited higher Cd and Cu levels. This finding suggests carapace tissue could serve as a suitable surrogate sample source for internal organs/tissues when monitoring exposure of live Kemp??s ridleys to certain metals. The fact that larger, stranded ridleys exhibited higher Ag, Cd, Hg, Pb and Zn levels than did their smaller, live analogs from Texas and Louisiana implies that these older ridleys had increased opportunities to accumulate higher metal concentrations in their carapace tissue than did their younger conspecifics. This trend suggests that carapace tissue has the potential to accumulate trace metals while blood-borne concentrations reflect only recent exposure to trace metals.

Wang, Hui-Chen

2006-05-01T23:59:59.000Z

288

Chemical Structure and Dynamics  

NLE Websites -- All DOE Office Websites (Extended Search)

2154-3 2154-3 UC-400 Annual Report 2000 Chemical Structure and Dynamics Steven D. Colson, Associate Director Robin S. McDowell, Program Manager and the Staff of the Chemical Structure and Dynamics Program April 2001 Prepared for the U.S. Department of Energy under Contract DE-AC06-76RL01830 Chemical Structure and Dynamics 2000 Annual Report Contents Chemical Structure and Dynamics 2000 Annual Report Chemical Structure and Dynamics 2000 Annual Report 1. Introduction Chemical Structure and Dynamics Program......................................................... 1-3 2. Reaction Mechanisms at Liquid Interfaces Structure and Reactivity of Ice Surfaces and Interfaces G. A. Kimmel, Z. Dohnálek, K. P. Stevenson, R. S. Smith,

289

Potential for Microbial Stimulation in Deep Vadose Zone Sediments by Gas-Phase Nutrients  

Science Conference Proceedings (OSTI)

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.

Li, S.W.; Plymale, A. E.; Brockman, F.J.

2006-04-05T23:59:59.000Z

290

Dynamic Instruction Fusion  

E-Print Network (OSTI)

SANTA CRUZ DYNAMIC INSTRUCTION FUSION A thesis submitted in4 2.2 Instruction Fusion & Complex10 3.1 Fusion Selection

Lee, Ian

2012-01-01T23:59:59.000Z

291

Fundamentals of Dynamic Behavior  

Science Conference Proceedings (OSTI)

Feb 28, 2011 ... Atomistically-Informed Dislocation Dynamics Simulations of High Rate Deformation of Single fcc Crystals: Zhiqiang Wang1; 1University of North ...

292

Dynamic Windows.pdf  

NLE Websites -- All DOE Office Websites (Extended Search)

including products with improved fixed or static properties and products with dynamic solar heat gain proper- ties. Nine representative window products are examined in eight...

293

Partial Dynamical Symmetry and Mixed Dynamics  

E-Print Network (OSTI)

Partial dynamical symmetry describes a situation in which some eigenstates have a symmetry which the quantum Hamiltonian does not share. This property is shown to have a classical analogue in which some tori in phase space are associated with a symmetry which the classical Hamiltonian does not share. A local analysis in the vicinity of these special tori reveals a neighbourhood of phase space foliated by tori. This clarifies the suppression of classical chaos associated with partial dynamical symmetry. The results are used to divide the states of a mixed system into ``chaotic'' and ``regular'' classes.

A. Leviatan; N. D. Whelan

1996-08-24T23:59:59.000Z

294

Combining CSP and ObjectZ: Finite or Infinite Trace Semantics?  

E-Print Network (OSTI)

Combining CSP and Object­Z: Finite or Infinite Trace Semantics? Clemens Fischer Universit semantics as a means of combin­ ing 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

Smith, Graeme

295

Combining CSP and ObjectZ: Finite or Infinite Trace Semantics?  

E-Print Network (OSTI)

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

Olderog, Ernst-Rüdiger

296

Error traces in model-based debugging of hardware description languages  

Science Conference Proceedings (OSTI)

In this article we address the fault localization problem in HDLs, particularly in VHDL designs. Our approach relies on the model-based diagnosis paradigm and, unlike to other approaches that rely on the design's gate-level representation, we accurately ... Keywords: automated debugging, conditional dependency, error trace, fault localization, potential influence, software debugging, source-level debugging

Bernhard Peischl; Franz Wotawa

2005-09-01T23:59:59.000Z

297

Trace distance and linear entropy of qubit states: Role of initial qubit-environment correlations  

E-Print Network (OSTI)

The role of initial qubit-environment correlations on trace distance between two qubit states is studied in the framework of non--Markovian pure dephasing. The growth of mixedness of reduced state quantified by linear entropy is shown to be related to the degree of initial qubit--environment correlations.

Jerzy Dajka; Jerzy Luczka

2013-04-08T23:59:59.000Z

298

Trace metal speciation in saline waters affected by geothermal brines. Final technical report. [GEOCHEM  

DOE Green Energy (OSTI)

The computer program GEOCHEM was developed and applied to calculate the speciation of trace elements, such as Li, B, Mn, Co, Ni, Cu, Zn, Pb, and As, in mixtures of geothermal brines with soil waters. A typical speciation calculation involved the simultaneous consideration of about 350 inorganic and organic complexes and about 80 possible solid phases that could form among the macro- and microconstituents in the mixtures. The four geothermal brines chosen for study were from the East Mesa, Heber, and Salton Sea KGRA's. Two examples of East Mesa brine were employed in order to illustrate the effect of brine variability within a given KGRA. The soil waters chosen for study were the Holtville, Rosita, and Vint soil solutions and the Vail 4 drain water. These waters were mixed with the four brines to produce 1%, 5%, and 10% brine combinations. The combinations then were analyzed with the help of GEOCHEM and were interpreted in the context of two proposed general contamination scenarios. The results of the speciation calculations pointed to the great importance, in brine, of sulfide as a precipitating agent for trace metals and of borate as a trace metal-complexing ligand. In general, precipitation and/or exchange adsorption in soil were found to reduce the levels of trace metals well below harmful concentrations. The principal exceptions were Li and B, which did not precipitate and which were at or very hear harmful levels in the soil water-brine mixtures.

Sposito, G.

1979-07-01T23:59:59.000Z

299

A cost effective trace gas measurement program for long term monitoring of the stratospheric circulation  

Science Conference Proceedings (OSTI)

A stratospheric trace gas measurement program using balloon-based sonde and AirCore sampler techniques, is proposed as a way to monitor the strength of the stratospheric mean meridional, or Brewer-Dobson circulation. Modeling work predicts a strengthening ...

Fred L. Moore; Eric A. Ray; Karen H. Rosenlof; James W. Elkins; Pieter Tans; Anna Karion; Colm Sweeney

300

Tracing Medical Images Using Multi-Band Watermarks Mingyan Li, Sreeram Narayanan and Radha Poovendran  

E-Print Network (OSTI)

1 of 4 Tracing Medical Images Using Multi-Band Watermarks Mingyan Li, Sreeram Narayanan and Radha identify that there is a gap between current security solutions for the privacy protection of medical who distribute medical images illegally. We evaluate the suitability of some most widely used

Poovendran, Radha

Note: This page contains sample records for the topic "nutrient dynamics trace" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

On the Determination of Age of Air Trends from Atmospheric Trace Species  

Science Conference Proceedings (OSTI)

Trace chemical species have been used in numerical models to calculate the age of air (AOA), which is a measure of the strength of the mean meridional circulation. The trend in the AOA has also been computed and found to be negative in ...

Rolando R. Garcia; William J. Randel; Douglas E. Kinnison

2011-01-01T23:59:59.000Z

302

A circuit theory based load flow tracing method considering counter-flow contribution  

Science Conference Proceedings (OSTI)

A new method to trace the power flow based on the converged AC power flow solution is proposed in this paper. The method is formulated by using the transmission network structure, the equivalent-current-injection and the load- equivalent-admittances ... Keywords: equivalent current injection, equivalent load impedance, generator contribution, line loss allocation

Whei-Min Lin; Tung-Sheng Zhan; Cong-Hui Huang

2006-04-01T23:59:59.000Z

303

Runtime verification for multicore SoC with high-quality trace data  

Science Conference Proceedings (OSTI)

Multicore System-on-Chip (SoC) implementations of embedded systems are becoming very popular. In these systems it is possible to spread out computations over many cores. On one hand this leads to better energy efficiency if clock frequencies and core ... Keywords: Multicore SoC, embedded system, runtime verification, synchronisation, test driven development, trace data

Rico Backasch; Christian Hochberger; Alexander Weiss; Martin Leucker; Richard Lasslop

2013-03-01T23:59:59.000Z

304

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

E-Print Network (OSTI)

, and pipeline leak detection. Applications such as landfill emissions monitoring require measurements of gasRoom-temperature mid-infrared laser sensor for trace gas detection Thomas To¨ pfer, Konstantin P. Petrov, Yasuharu Mine, Dieter Jundt, Robert F. Curl, and Frank K. Tittel Design and operation

305

Tracing the Birth of an OSN: Social Graph and Profile Analysis in Google+  

E-Print Network (OSTI)

Tracing the Birth of an OSN: Social Graph and Profile Analysis in Google+ Doris Schi¨oberg Fabian of Google launch- ing the Google+ OSN. Through multiple crawls of the Google+ OSN, before and after of the birth of an OSN. Our findings underline the impact of peculiar aspects of Google+ such as (a) Google

Schmid, Stefan

306

Emission Factors Handbook: Guidelines for Estimating Trace Substance Emissions from Fossil Fuel Steam Electric Plants  

Science Conference Proceedings (OSTI)

The "Emission Factors Handbook" provides a tool for estimating trace substances emissions from fossil-fuel-fired power plants. The suggested emission factors are based on EPRI and Department of Energy (DOE) field measurements conducted at over 50 power plants using generally consistent sampling and analytical protocols. This information will help utility personnel estimate air toxic emissions for permitting purposes.

2002-04-10T23:59:59.000Z

307

An underwater acoustic channel model using ray tracing in ns-2  

Science Conference Proceedings (OSTI)

Underwater Acoustic Sensor Network (UASN) is the enabling technology for real-time underwater monitoring and data collection. The costly underwater trials and unknown underwater acoustic modem infrastructures increase the need and importance of a reliable ... Keywords: ns-2, ray tracing, sensor network, underwater

Tarik Çinar; M. Bülent Örencik

2009-12-01T23:59:59.000Z

308

Nuclear and Trace Ideals in Tensored \\LambdaCategories Samson Abramsky \\Lambda  

E-Print Network (OSTI)

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

Blute, Richard

309

Nuclear and Trace Ideals in Tensored \\LambdaCategories Samson Abramsky \\Lambda  

E-Print Network (OSTI)

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

Abramsky, Samson

310

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

Science Conference Proceedings (OSTI)

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.

Cuadra A.; Baek J.; Cheng, L.; Aronson, A.; Diamond, D.; Yarsky, P.

2013-11-10T23:59:59.000Z

311

JV Task 59-Demonstration of Accelerated In Situ Contaminant Degradation by Vacuum-Enhanced Nutrient Distribution  

Science Conference Proceedings (OSTI)

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.

Jaroslav Solc

2007-03-15T23:59:59.000Z

312

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

E-Print Network (OSTI)

The accumulation rates of sediments and trace metals (Co, Cr, Cu, Ni, Pb, Zn) were measured along with the concentrations of Al, Fe, Mn and organic carbon in four sediment cores from Sabine-Neches estuary, near Beaumont, Texas. A reliable 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 was estimated to be about 4-5 mm/yr. Due to the very low and variable activities of excess 21OPb in the sediments, the 21OPb dating method did not prove to be very useful in the study area. One difficulty had to do with the large variability of grain size parameters in the sediments. The amount of fines varied from 90% within a single core. The activities of excess 21OPb and the concentrations of Al, Fe, organic carbon, and trace metals varied as a function of the amount of fine particles. 21OPb at the bottom of the sediment cores was in secular equilibrium with 226Ra, 23OTh, and 234U in some cores, while in others, this was not the case. The reasons for disagreement between 21OPb and 226Ra concentrations at depth were investigated. The mixing rates of surface sediments were low and was about 0.16-0.40 cm2yr-1. Down core variations of aluminum normalized enrichment factors for trace metals demonstrated that, since 1860, the sediments of this estuary have remained relatively "pristine" with respect to trace metal concentrations. While the concentrations of Pb and Zn in some sections of the sediment column were slightly enriched, Co, Cr, Cu, and Ni were depleted in all sediment cores analyzed. No significant enrichment of light rare earth elements was observed. Enrichment might have been expected from inputs of cracking catalysts used in refineries. Therefore REEs could not be used as non-steady tracers. The lack of strong enrichment of trace metals, light rare earth elements, and low inventories of radioisotopes could be a result of the short residence time of the estuarine water, long removal residence times of trace metals and radioactive elements in the water column, low salinity conditions, and possibly, complexation of these metals with dissolved organic matter.

Ravichandran, Mahalingam

1994-01-01T23:59:59.000Z

313

Towards dynamic collaboration architectures  

Science Conference Proceedings (OSTI)

In this paper, we introduce the concept of dynamically changing between centralized, replicated, and hybrid collaboration architectures. It is implemented by providing users a function that dynamically changes the mapping between user-interface and program ... Keywords: ad-hoc collaboration, application sharing, collaboration architecture, latecomers, mobile collaboration

Goopeel Chung; Prasun Dewan

2004-11-01T23:59:59.000Z

314

Development of monitoring and control technology based on trace gas monitoring. Final report  

DOE Green Energy (OSTI)

Trace gases are generated by many biological reactions. During anaerobic decomposition, trace levels of hydrogen (H{sub 2}) and carbon monoxide (CO) gases are produced. It was shown previously that these trace gases are intrinsically related to the biochemical reactions occurring and, therefore, offer promise for on-line process monitoring and control. This work was designed to test how effectively hydrogen and CO could be to monitor high-rate anaerobic systems that has significant mass transfer and complex hydraulics. An experimental program was designed to examine the behavior of an upflow anaerobic sludge blanket (UASB) reactor system under steady state and in response to organic loading perturbations. The responses of trace gases CO and H{sub 2} were tracked using an on-line, real-time gas-monitoring system linked to a computer-controlled data acquisition package. Data on conventional process parameters such as pH, chemical oxygen demand (COD), volatile fatty acids (VFAs) were concurrently collected. Monitoring of conventional process indicators (i.e., pH, VFA, gas production) and trace gas (H{sub 2} and CO) indicators was conducted using a matrix of nine different steady-state OLRs (4-23 kg COD/m{sup 3} -d) and system HRTs (0.5 to 2.5 days) was performed to determine any correlation among the indicators. Of OLR, HRT, and influent COD, only OLR had any significant influence on the process indicators examined. All parameters except methane increased with increases in OLR; methane decreased with increased OLR. The OLR and gas production rate (GP) were observed to be linearly correlated.

Liebowitz, B.

1997-07-01T23:59:59.000Z

315

Langevin molecular dynamics derived from Ehrenfest dynamics  

E-Print Network (OSTI)

Stochastic Langevin molecular dynamics for nuclei is derived from the Ehrenfest Hamiltonian system (also called quantum classical molecular dynamics) in a Kac-Zwanzig setting, with the initial data for the electrons stochastically perturbed from the ground state and the ratio, $M$, of nuclei and electron mass tending to infinity. The Ehrenfest nuclei dynamics is approximated by the Langevin dynamics with accuracy $o(M^{-1/2})$ on bounded time intervals and by $o(1)$ on unbounded time intervals, which makes the small $\\mathcal{O}(M^{-1/2})$ friction and $o(M^{-1/2})$ diffusion terms visible. The initial electron probability distribution is a Gibbs density at low temperture, derived by a stability and consistency argument: starting with any equilibrium measure of the Ehrenfest Hamiltonian system, the initial electron distribution is sampled from the equilibrium measure conditioned on the nuclei positions, which after long time leads to the nuclei positions in a Gibbs distribution (i.e. asymptotic stability); by consistency the original equilibrium measure is then a Gibbs measure.The diffusion and friction coefficients in the Langevin equation satisfy the Einstein's fluctuation-dissipation relation.

Anders Szepessy

2007-12-21T23:59:59.000Z

316

Nitrogen and Sulfur Requirements for Clostridium thermocellum and Caldicellulosiruptor bescii on Cellulosic Substrates in Minimal Nutrient Media  

Science Conference Proceedings (OSTI)

Growth media for cellulolytic Clostridium thermocellum and Caldicellulosiruptor bescii bacteria usually contain excess nutrients that would increase costs for consolidated bioprocessing for biofuel production and create a waste stream with nitrogen, sulfur and phosphate. C. thermocellum was grown on crystalline cellulose with varying concentrations of nitrogen and sulfur compounds, and growth rate and alcohol production response curves were determined. Both bacteria assimilated sulfate in the presence of ascorbate reductant, increasing the ratio of oxidized to reduced fermentation products. From these results, a low ionic strength, defined minimal nutrient medium with decreased nitrogen, sulfur, phosphate and vitamin supplements was developed for the fermentation of cellobiose, cellulose and acid-pretreated Populus. Carbon and electron balance calculations indicate the unidentified residual fermentation products must include highly reduced molecules. Both bacterial populations were maintained in co-cultures with substrates containing xylan or hemicellulose in defined medium with sulfate and basal vitamin supplements.

Kridelbaugh, Donna M [ORNL; Nelson, Josh C [ORNL; Engle, Nancy L [ORNL; Tschaplinski, Timothy J [ORNL; Graham, David E [ORNL

2013-01-01T23:59:59.000Z

317

Effects of CO{sub 2} and nitrogen fertilization on growth and nutrient content of juvenile ponderosa pine  

DOE Green Energy (OSTI)

This data set presents measured values of plant diameter and height, biomass of plant components, and nutrient (carbon, nitrogen, phosphorus, sulfur, potassium, calcium, magnesium, boron, copper, iron, manganese, and zinc) concentrations from a study of the effects of carbon dioxide and nitrogen fertilization on ponderosa pine (Pinus ponderosa Dougl. ex Laws.) conducted in open-top chambers in Placerville, California, from 1991 through 1996. This data set contains values from 1991 through 1993.

Johnson, D.W. [Desert Research Inst., Reno, NV (United States). Biological Sciences Center]|[Univ. of Nevada, Reno, NV (United States). Coll. of Agriculture; Ball, J.T. [Desert Research Inst., Reno, NV (United States). Biological Sciences Center; Walker, R.F. [Univ. of Nevada, Reno, NV (United States). Coll. of Agriculture; Cushman, R.M. [Oak Ridge National Lab., TN (United States). Carbon Dioxide Information Analysis Center

1998-03-01T23:59:59.000Z

318

Implementation of the Watershed Analysis Risk Management Framework (WARMF) Watershed Model for Nutrient Trading in the Ohio River Ba sin  

Science Conference Proceedings (OSTI)

As part of the Ohio River Water Quality Trading Program, the Scioto, Muskingum, and Allegheny watersheds were analyzed, using the Watershed Analysis Risk Management Framework (WARMF) model, to determine their capacity for nutrient trading. For consistency across the Ohio River Basin, the watershed models were implemented using the hydrological unit code (HUC) 10 delineation available from the United States Geological Survey. Data from the Ohio Environmental Protection Agency, Pennsylvania Department ...

2012-07-20T23:59:59.000Z

319

Use of respirometry to determine the effect of nutrient enhancement on JP-8 biodegradability. Master`s thesis  

Science Conference Proceedings (OSTI)

The purpose of this study was to use respirometry to measure the impact of nutrient combinations or treatments on JP - 8 biodegradation under simulated fuel spill soil conditions. The study was designed observe one soil type at a constant fuel exposure level of 1% and a constant moisture of 60% of field capacity. Three experiments conducted were of two and three factor designs with potassium nitrate and sodium phosphate addition levels serving as two factors and fuel serving as a third factor in Experiments 1 and 2. Cumulative oxygen values obtained by the respirometer were assumed to be a direct indicator of JP-8 biodegradation. Therefore, cumulative oxygen values were used as the response variable for statistical analysis to determine the impact of nutrient enhancement on biodegradation 0fJP - 8.O2 consumption and CO2 production rate data were collected to ensure respiration activity levels were declining or stable to allow for cumulative oxygen data interpretation. Nutrient enhancement was found not to have a positive impact on biodegradation under these conditions. Additionally, losses due to degradation of the JP - 8 were found to be less than losses from volatilization.

Totten, C.T.

1995-11-27T23:59:59.000Z

320

Solar Dynamics | Open Energy Information  

Open Energy Info (EERE)

Dynamics Jump to: navigation, search Name Solar Dynamics Place Ottumwa, Iowa Zip IA 52501 Sector Solar Product Solar Dynamics is a US-based solar powered attic roof vents...

Note: This page contains sample records for the topic "nutrient dynamics trace" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Advances in Conjugated Linoleic Acid Research, Vol 2Chapter 16 Conjugated Linoleic Acids as Anticancer Nutrients: Studies In Vivo and Cellular Mechanisms  

Science Conference Proceedings (OSTI)

Advances in Conjugated Linoleic Acid Research, Vol 2 Chapter 16 Conjugated Linoleic Acids as Anticancer Nutrients: Studies In Vivo and Cellular Mechanisms Health Nutrition Biochemistry eChapters Health - Nutrition - Biochemistry AOCS Pr

322

Dynamic Behavior of Materials V  

Science Conference Proceedings (OSTI)

Dynamic Characterization of Cast and Wrought Uranium-Niobium Metals · Dynamic Deformation Response of High-Strength Ni-Containing Steels.

323

Cirrus Outflow Dynamics  

Science Conference Proceedings (OSTI)

Cirrus outflow from deep convection are analyzed as dynamically and thermodynamically active systems. The initial outflow is considered as an analog to wake collapse, in which a neutrally buoyant flow intrusion is flattened and stretched by its ...

Douglas K. Lilly

1988-05-01T23:59:59.000Z

324

WORKSHOP ON NUCLEAR DYNAMICS  

E-Print Network (OSTI)

Complete Events in Medium-Energy Nuclear Collisions" C-Y.+ corrections. (A) The nuclear potential-energy problem isquantum dynamics in high-energy nuclear collisions. We have

Myers, W.D.

2010-01-01T23:59:59.000Z

325

Optical dynamic circuit services  

Science Conference Proceedings (OSTI)

IP service, leased-line service and POTS service have been the three long-standing communication service offerings of providers. Recently, both commercial and research-andeducation network providers have started offering optical dynamic circuit services. ...

Malathi Veeraraghavan; Mark Karol; George Clapp

2010-11-01T23:59:59.000Z

326

A Molecular Dynamics Simulation  

Science Conference Proceedings (OSTI)

Ab Initio Local Energy and Local Stress Calculations: Applications to Materials ... Computational Fluid Dynamics and Experimental Results for the Horizontal .... Films and Applications to a New Generation of Multifunctional Devices/Systems.

327

A Molecular Dynamics  

Science Conference Proceedings (OSTI)

A Tale of Two States and More: Modeling of New Generation of Lattice Stability from Zero ... Analysis of Nano Fluid Using CFD-A Hybrid Approach for Cooling Purpose ... Molecular Dynamics Simulations of Grain Boundary Free Energy and

328

A Molecular Dynamic Study  

Science Conference Proceedings (OSTI)

A Tale of Two States and More: Modeling of New Generation of Lattice Stability from Zero ... Analysis of Nano Fluid Using CFD-A Hybrid Approach for Cooling Purpose ... Molecular Dynamics Simulations of Grain Boundary Free Energy and

329

Frontal Geostrophic Dynamics  

Science Conference Proceedings (OSTI)

From the primitive equations simplified dynamics are derived that apply to frontal situations in which interface slopes are important. The formalism, which eliminates inertial motions, is not Unlike the derivation of the quasi-geostrophic ...

Benoit Cushman-Roisin

1986-01-01T23:59:59.000Z

330

Microsoft Word - qs_trace-700_v6-2-4.docx  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

2.4 2.4 On this page you'll find information about the TRACE 700 version 6.2.4 qualified computer software (www.buildings.energy.gov/qualified_software.html), which calculates energy and power cost savings that meet federal tax incentive requirements for commercial buildings. Date Documentation Received by DOE: 4 November 2009 Statements in quotes are from the software developer. Internal Revenue Code §179D (c)(1) and (d) Regulations Notice 2006-52, Section 6 requirements as amplified by Notice 2008-40, Section 4 requirements. (1) The name, address, and (if applicable) web site of the software developer; Trane 3600 Pammel Creek Road La Crosse, WI 54601 http://www.trane.com/trace (2) The name, email address, and telephone number of the person to contact for

331

Tracing Aerosol Impacts on South Asian Monsoons | U.S. DOE Office of  

NLE Websites -- All DOE Office Websites (Extended Search)

Science Highlights » 2013 Science Highlights » 2013 » Tracing Aerosol Impacts on South Asian Monsoons Biological and Environmental Research (BER) BER Home About Research Facilities Science Highlights Searchable Archive of BER Highlights External link Benefits of BER Funding Opportunities Biological & Environmental Research Advisory Committee (BERAC) News & Resources Contact Information Biological and Environmental Research U.S. Department of Energy SC-23/Germantown Building 1000 Independence Ave., SW Washington, DC 20585 P: (301) 903-3251 F: (301) 903-5051 E: sc.ber@science.doe.gov More Information » September 2013 Tracing Aerosol Impacts on South Asian Monsoons The effect of pollution aerosols on monsoons. Print Text Size: A A A Subscribe FeedbackShare Page Click to enlarge photo. Enlarge Photo

332

HPCT MPI Profiling and Tracing Library on BG/P Systems | Argonne Leadership  

NLE Websites -- All DOE Office Websites (Extended Search)

MPI Profiling and Tracing Library on BG/P Systems MPI Profiling and Tracing Library on BG/P Systems References IBM System Blue Gene Solution: High Performance Computing Toolkit for Blue Gene/P - IBM Redbook describing HPCT and other performance tools Introduction The HPC Toolkit provides a mechanism for obtain information about the use of MPI routines during a programs execution. This is done through the use of a library which intercepts calls to MPI routines, records information about the call, and then continues with the MPI call. When the program terminates use of MPI by calling MPI_Finalize the data gathered by the library is written to one or more files in the program execution directory. The the primary types of information that are gathered and writen by the library are: MPI Profile Data- A summary of MPI usage information typically

333

Tax Deduction Qualified Software TRACE 700 version 6.3.0  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

3.0 3.0 On this page you'll find information about the TRACE 700 version 6.3.0 qualified computer software (www.buildings.energy.gov/qualified_software.html), which calculates energy and power cost savings that meet federal tax incentive requirements for commercial buildings. Date Documentation Received by DOE: 11 September 2013 Statements in quotes are from the software developer. Internal Revenue Code §179D (c)(1) and (d) Regulations Notice 2006-52, Section 6 requirements as amplified by Notice 2008-40, Section 4 requirements. (1) The name, address, and (if applicable) web site of the software developer; Trane 3600 Pammel Creek Road La Crosse, WI 54601 http://www.trane.com/trace (2) The name, email address, and telephone number of the person to contact for

334

Trace Element Analysis At Long Valley Caldera Area (Klusman & Landress,  

Open Energy Info (EERE)

Klusman & Landress, Klusman & Landress, 1979) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Trace Element Analysis At Long Valley Caldera Area (Klusman & Landress, 1979) Exploration Activity Details Location Long Valley Caldera Area Exploration Technique Trace Element Analysis Activity Date Usefulness useful DOE-funding Unknown Notes This study involved the field collection and laboratory analysis of Al-horizon soil samples in the vicinity of a known geothermal source at Long Valley, California. The samples were analyzed for several constituents known to have influence on Hg retention by soils, including pH, hydrous Fe and Mn, and organic carbon, as well as Hg. The data compiled for these secondary parameters and the field-determined parameters of geology, soil

335

Tax Deduction Qualified Software: Trace 700 version 6.2.10  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

2.10 2.10 On this page you'll find information about the TRACE 700 version 6.2.10 qualified computer software (www.buildings.energy.gov/qualified_software.html), which calculates energy and power cost savings that meet federal tax incentive requirements for commercial buildings. Date Documentation Received by DOE: 11 March 2013 Statements in quotes are from the software developer. Internal Revenue Code §179D (c)(1) and (d) Regulations Notice 2006-52, Section 6 requirements as amplified by Notice 2008-40, Section 4 requirements. (1) The name, address, and (if applicable) web site of the software developer; Trane 3600 Pammel Creek Road La Crosse, WI 54601 http://www.trane.com/trace (2) The name, email address, and telephone number of the person to contact for

336

Dynamic neurotransmitter interactions measured with PET  

SciTech Connect

Positron emission tomography (PET) has become a valuable interdisciplinary tool for understanding physiological, biochemical and pharmacological functions at a molecular level in living humans, whether in a healthy or diseased state. The utility of tracing chemical activity through the body transcends the fields of cardiology, oncology, neurology and psychiatry. In this, PET techniques span radiochemistry and radiopharmaceutical development to instrumentation, image analysis, anatomy and modeling. PET has made substantial contributions in each of these fields by providing a,venue for mapping dynamic functions of healthy and unhealthy human anatomy. As diverse as the disciplines it bridges, PET has provided insight into an equally significant variety of psychiatric disorders. Using the unique quantitative ability of PET, researchers are now better able to non-invasively characterize normally occurring neurotransmitter interactions in the brain. With the knowledge that these interactions provide the fundamental basis for brain response, many investigators have recently focused their efforts on an examination of the communication between these chemicals in both healthy volunteers and individuals suffering from diseases classically defined as neurotransmitter specific in nature. In addition, PET can measure the biochemical dynamics of acute and sustained drug abuse. Thus, PET studies of neurotransmitter interactions enable investigators to describe a multitude of specific functional interactions in the human brain. This information can then be applied to understanding side effects that occur in response to acute and chronic drug therapy, and to designing new drugs that target multiple systems as opposed to single receptor types. Knowledge derived from PET studies can be applied to drug discovery, research and development (for review, see (Fowler et al., 1999) and (Burns et al., 1999)). Here, we will cover the most substantial contributions of PET to understanding biologically distinct neurochemical systems that interact to produce a variety of behaviors and disorders. Neurotransmitters are neither static nor isolated in their distribution. In fact, it is through interactions with other neurochemically distinct systems that the central nervous system (CNS) performs its vital role in sustaining life. Exclusive quantitative capabilities intrinsic to PET make this technology a suitable experimental tool to measure not only the regional distribution of specific receptors and their subtypes, but also the dynamic properties of neuroreceptors and their inherent influence on related neurotransmitter pathways. The ability to investigate dynamic properties in a non-invasive and reproducible manner provides a powerful tool that can extend our current knowledge of these interactions. Coupled with innovative paradigms including pharmacologic manipulations, physiologic models and reconstruction theories, knowledge derived from PET studies can greatly advance our understanding of normal and abnormal brain function.

Schiffer, W.K.; Dewey, S.L.

2001-04-02T23:59:59.000Z

337

Global tropospheric chemistry models for radiatively important trace species: Design and research recommendations  

SciTech Connect

Changes in the Earth`s climate could significantly affect regional and global concentrations of trace species that are criteria pollutants regulated by the US Environmental Protection Agency (EPA). The policy community also needs to know how changes in global natural and anthropogenic emissions of greenhouse gases, particulate aerosols, and aerosol precursors will affect the distribution and concentration of these pollutants. This report maps out one path for obtaining this information.

Barchet, W.R.; Brothers, A.J.; Berkowitz, C.M.; Easter, R.C.; Ghan, S.J.; Saylor, R.D.

1993-12-01T23:59:59.000Z

338

Atmospheric Deposition of Mercury, Trace Elements, and Major Ions Around a Coal-fired Power Plant  

Science Conference Proceedings (OSTI)

This report describes the results of a multiyear study to measure mercury (Hg), trace elements, and major ions in precipitation around Plant Crist, a four-unit coal-fired power plant in Pensacola, Florida. The main purpose of the study was to see if Hg emissions from Plant Crist could be detected and quantified in local wet deposition. Specifically, the study evaluated whether the significant reduction in Hg emissions that accompanied the installation of a wet flue gas desulfurization scrubber ...

2013-12-22T23:59:59.000Z

339

W.: Model Driven Instrumentation for Relational Event Traces. Radioelektronic and Computer Systems 6(18  

E-Print Network (OSTI)

Instrumentation of software is a part of debugging, performance evaluation and autonomic software systems. It enables the observability of program behaviour. However, instrumentation is costly and error prone. This paper presents an approach called Model Driven Instrumentation for Relational Event Traces. The approach enables the specification of system models and models for instrumentation as separate concerns, and allows to automatically generate instrumented systems from the models. Instrumentation, Model Driven Architecture

M. Boškovi?; T. Warns; W. Hasselbring

2006-01-01T23:59:59.000Z

340

Isotopic and trace element characteristics of rhyolites from the Valles Caldera, New Mexico. Final technical report  

DOE Green Energy (OSTI)

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.

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

1991-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "nutrient dynamics trace" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Laser ray tracing in a parallel arbitrary Lagrangian-Eulerian adaptive mesh refi  

NLE Websites -- All DOE Office Websites (Extended Search)

ray tracing in a parallel arbitrary Lagrangian-Eulerian adaptive mesh refinement ray tracing in a parallel arbitrary Lagrangian-Eulerian adaptive mesh refinement hydrocode This article has been downloaded from IOPscience. Please scroll down to see the full text article. 2010 J. Phys.: Conf. Ser. 244 032022 (http://iopscience.iop.org/1742-6596/244/3/032022) Download details: IP Address: 50.136.219.251 The article was downloaded on 18/04/2013 at 01:39 Please note that terms and conditions apply. View the table of contents for this issue, or go to the journal homepage for more Home Search Collections Journals About Contact us My IOPscience Laser Ray Tracing in a Parallel Arbitrary Lagrangian-Eulerian Adaptive Mesh Refinement Hydrocode N D Masters 1 , T B Kaiser 1 , R W Anderson 1 , D C Eder 1 , A C Fisher 1 , A E Koniges 2 1 Lawrence Livermore National Laboratory, Livermore, CA U.S.A. 2 National

342

Hierarchical probing for estimating the trace of the matrix inverse on toroidal lattices  

E-Print Network (OSTI)

The standard approach for computing the trace of the inverse of a very large, sparse matrix $A$ is to view the trace as the mean value of matrix quadratures, and use the Monte Carlo algorithm to estimate it. This approach is heavily used in our motivating application of Lattice QCD. Often, the elements of $A^{-1}$ display certain decay properties away from the non zero structure of $A$, but random vectors cannot exploit this induced structure of $A^{-1}$. Probing is a technique that, given a sparsity pattern of $A$, discovers elements of $A$ through matrix-vector multiplications with specially designed vectors. In the case of $A^{-1}$, the pattern is obtained by distance-$k$ coloring of the graph of $A$. For sufficiently large $k$, the method produces accurate trace estimates but the cost of producing the colorings becomes prohibitively expensive. More importantly, it is difficult to search for an optimal $k$ value, since none of the work for prior choices of $k$ can be reused.

Andreas Stathopoulos; Jesse Laeuchli; Kostas Orginos

2013-02-17T23:59:59.000Z

343

Simulation of a main steam line break with steam generator tube rupture using trace  

Science Conference Proceedings (OSTI)

A simulation of the OECD/NEA ROSA-2 Project Test 5 was made with the thermal-hydraulic code TRACE5. Test 5 performed in the Large Scale Test Facility (LSTF) reproduced a Main Steam Line Break (MSLB) with a Steam Generator Tube Rupture (SGTR) in a Pressurized Water Reactor (PWR). The result of these simultaneous breaks is a depressurization in the secondary and primary system in loop B because both systems are connected through the SGTR. Good approximation was obtained between TRACE5 results and experimental data. TRACE5 reproduces qualitatively the phenomena that occur in this transient: primary pressure falls after the break, stagnation of the pressure after the opening of the relief valve of the intact steam generator, the pressure falls after the two openings of the PORV and the recovery of the liquid level in the pressurizer after each closure of the PORV. Furthermore, a sensitivity analysis has been performed to know the effect of varying the High Pressure Injection (HPI) flow rate in both loops on the system pressures evolution. (authors)

Gallardo, S.; Querol, A.; Verdu, G. [Departamento de Ingenieria Quimica Y Nuclear, Universitat Politecnica de Valencia, Camino de Vera s/n, 46022, Valencia (Spain)

2012-07-01T23:59:59.000Z

344

Comparison of an impedance heating system to mineral insulated heat trace for power tower applications  

DOE Green Energy (OSTI)

A non-conventional type of heating system is being tested at Sandia National Laboratories for solar thermal power tower applications. In this system, called impedance heating, electric current flows directly through the pipe to maintain the desired temperature. The pipe becomes the resistor where the heat is generated. Impedance heating has many advantages over previously used mineral insulated (MI) heat trace. An impedance heating system should be much more reliable than heat trace cable since delicate junctions and cabling are not used and the main component, a transformer, is inherently reliable. A big advantage of impedance heating is the system can be sized to rapidly heat up the piping to provide rapid response times necessary in cyclic power plants such as solar power towers. In this paper, experimental results from testing an impedance heating system are compared to MI heat trace. The authors found impedance heating was able to heat piping rapidly and effectively. There were not significant stray currents and impedance heating did not affect instrumentation.

Pacheco, J.E.; Kolb, W.J.

1997-03-01T23:59:59.000Z

345

Trace-gas sensing using the compliance voltage of an external cavity quantum cascade laser  

SciTech Connect

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.

Phillips, Mark C.; Taubman, Matthew S.

2013-06-04T23:59:59.000Z

346

TRACE Model for Simulation of Anticipated Transients Without Scram in a BWR  

Science Conference Proceedings (OSTI)

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.

Cheng L. Y.; Baek J.; Cuadra,A.; Aronson, A.; Diamond, D.; Yarsky, P.

2013-11-10T23:59:59.000Z

347

Annual Report 1998: Chemical Structure and Dynamics  

SciTech Connect

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).

SD Colson; RS McDowell

1999-05-10T23:59:59.000Z

348

New methods for quantum mechanical reaction dynamics  

DOE Green Energy (OSTI)

Quantum mechanical methods are developed to describe the dynamics of bimolecular chemical reactions. We focus on developing approaches for directly calculating the desired quantity of interest. Methods for the calculation of single matrix elements of the scattering matrix (S-matrix) and initial state-selected reaction probabilities are presented. This is accomplished by the use of absorbing boundary conditions (ABC) to obtain a localized (L{sup 2}) representation of the outgoing wave scattering Green`s function. This approach enables the efficient calculation of only a single column of the S-matrix with a proportionate savings in effort over the calculation of the entire S-matrix. Applying this method to the calculation of the initial (or final) state-selected reaction probability, a more averaged quantity, requires even less effort than the state-to-state S-matrix elements. It is shown how the same representation of the Green`s function can be effectively applied to the calculation of negative ion photodetachment intensities. Photodetachment spectroscopy of the anion ABC{sup -} can be a very useful method for obtaining detailed information about the neutral ABC potential energy surface, particularly if the ABC{sup -} geometry is similar to the transition state of the neutral ABC. Total and arrangement-selected photodetachment spectra are calculated for the H{sub 3}O{sup -} system, providing information about the potential energy surface for the OH + H{sub 2} reaction when compared with experimental results. Finally, we present methods for the direct calculation of the thermal rate constant from the flux-position and flux-flux correlation functions. The spirit of transition state theory is invoked by concentrating on the short time dynamics in the area around the transition state that determine reactivity. These methods are made efficient by evaluating the required quantum mechanical trace in the basis of eigenstates of the Boltzmannized flux operator.

Thompson, W.H. [Univ. of California, Berkeley, CA (United States). Dept. of Chemistry]|[Lawrence Berkeley Lab., CA (United States)

1996-12-01T23:59:59.000Z

349

Improving Cotton Embryo Culture by Simulating In Ovulo Nutrient and Hormone Levels  

Science Conference Proceedings (OSTI)

Plant ovules provide zygotes with a physicochemical environment that supports embryo differentiation, growth, and maturation. The exact nature of this embryogenesis-enabling environment is not well characterized, as evidenced by failed attempts to induce normal embryony from zygotes or proembryos (precotyledonary) on defined media. To identify factors required for cotton (Gossypium hirsutum L.) zygotic embryony in vitro, we previously performed chemical and dissolved oxygen tension analyses of cotton ovule fluids and tissues at multiple stages of embryony in situ. Based on these analyses, we report herein the development of procedures that normalize embryo differentiation, growth, maturation, and germination in vitro, starting with proembryos. Our medium differed from Murashige and Skoog (MS) medium as follows (percentage of MS): N (30%, mostly from ten amino acids), P (815%), K (237%), Mg (85%), Ca (267%), S (506%), Fe (88%), and myoinositol (883%). Levels of other MS nutrients and vitamins, except sucrose, were kept at MS levels. Additionally, we included 100 mg L-1 casein hydrolysate plus the following (mmol L-1): d-glucose (1.8), fructose (4.7), sucrose (62.0), arabinose (7.1), melibiose (3.5), malic acid (11.6), and citric acid (3.8). Mannitol was added to achieve a medium osmotic potential of -1.10 MPa, and an atmospheric O2 tension of 3.3 mol m-3 at the surface of embryos was maintained during culture. When cultured on medium containing 8.0 µmol L-1 indole-3-acetic acid, 80-90% of proembryos (as small as 100 cells) of cultivars HS-26 and B-27 increased four- to eightfold in surface area during the first 18 d in culture and germinated thereafter to produce viable plants. Increases in surface area of proembryos cultured on a modified MS medium previously used for somatic embryogenesis were from 0.2- to 0.6-fold. The described embryo culture medium should be useful for studying nutritional and molecular aspects of early embryony and possibly for plant zygote transformation protocols.

Rodney Fuller; Vincent Liddiard; J. Hess; John Carman

2011-06-01T23:59:59.000Z

350

Large River Food Webs: Influence of Nutrients, Turbidity, and Flow, and Implications for Management  

E-Print Network (OSTI)

Humans impact rivers in many ways that modify ecological processes yielding ecosystem services. In order to mitigate anthropogenic impacts, scientists are challenged to understand interactions among physicochemical factors affecting large river food webs. An understanding of socioeconomic factors also is critical for ecosystem management. In this dissertation, I explore spatiotemporal patterns in floodplain river food webs and political barriers to management of environmental flows, an important factor influencing river ecology. In Chapter II, I reviewed the scientific literature to test conceptual models of river food webs and predictions of environmental factors that might produce variation in basal production sources supporting consumer biomass. My review indicates that algae are the predominant production source for large rivers worldwide, but consumers assimilate C3 plants in rivers 1) with high sediment loads and low transparency during high flow pulses, 2) with high dissolved organic matter concentrations, and 3) following periods of high discharge or leaf litter fall that increase the amount of terrestrial material in the particulate organic matter pool. In Chapter III, I descrobe field research conducted to examine relationships among hydrology, nutrient concentrations, turbidity, and algal primary production and biomass in the littoral zone of five rivers in Texas, Peru, and Venezuela differing in physicochemical conditions. I used stable isotope signatures to estimate contributions of algal-versus terrestrial-based production sources to consumers during different hydrologic periods. My research indicates that during flow pulses in floodplain rivers, a decrease in algal biomass and productivity, combined with increased inputs of terrestrial organic matter, can result in increased terrestrial support of metazoan consumers in the aquatic food web. In 2007, Texas Senate Bill 3 directed that environmental flow recommendations be developed for river basins. Despite emphasis on use of the "best available science" to develop environmental flow regimes and "stakeholder involvement" to address needs of all water users, for the first two basins to complete the SB3 process, final environmental flow rules did not mimic a natural flow regime. In Chapter IV, I reviewed this process, concluding that incentives for river authorities to increase compromise with diverse stakeholders should result in more sustainable management of freshwater.

Roach, Katherine

2012-08-01T23:59:59.000Z

351

Dynamic manipulability of multifingered grasping  

Science Conference Proceedings (OSTI)

In this paper, we extend the concept of dynamic manipulability to evaluate the dynamic property of multifingered grasping systems consisting of amultifingered hand and a grasped object, and propose a measure of dynamic manipulability of multifingered ... Keywords: dynamic manipulability, grasping, internal force, multifingered hand, omnidirectionality

Yasuyoshi Yokokohji; Jose San Martin; Masaki Fujiwara

2009-08-01T23:59:59.000Z

352

Trace Evidence  

Science Conference Proceedings (OSTI)

... Reference Material We are working with other areas of NIST to replenish the depleted NIST Standard Reference Material (SRM) stock, which is ...

2012-11-26T23:59:59.000Z

353

Observations of temperature, wind, cirrus, and trace gases in the tropical tropopause transition layer during the MJO  

Science Conference Proceedings (OSTI)

Satellite observations of temperature, optically thin cirrus clouds, and trace gases derived from the Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC), Cloud-Aerosol Lidar and Infrared Pathfinder Satellite ...

Katrina S. Virts; John M. Wallace

354

Inert Trace Constituent Transport in Sigma and Hybrid Isentropic–Sigma Models. Part II: Twelve Semi-Lagrangian Algorithms  

Science Conference Proceedings (OSTI)

Part I of this paper examined nine trace constituent advection algorithms as applied in channel versions of the University of Wisconsin hybrid isentropic–sigma (?–?) and sigma (?) models. This paper examines the performance of 12 semi-Lagrangian ...

Fred M. Reames; Tom H. Zapotocny

1999-02-01T23:59:59.000Z

355

Multi-physics coupled code reactor analysis with the U.S. NRC code system TRACE/PARCS  

SciTech Connect

This paper will focus on the PARCS code and some of the recent applications of the coupled TRACE/PARCS codes to OECD LWR benchmarks and to the Advanced CANDU Reactor, the ACR-700. (authors)

Xu, Y.; Downar, T.; Ward, A. [Purdue Univ. (United States); Kozlowski, T. [KTH, Nuclear Power Safety (Sweden); Ivanov, K. [Penn State Univ. (United States)

2006-07-01T23:59:59.000Z

356

Telling friends from foes : strontium isotope and trace element analysis of companion burials from Pusilhá, Toledo District, Belize  

E-Print Network (OSTI)

Powell 1972 Strontium Isotope Geology. Minerals, Rocks, andisotope ratios in an ecosystem are a factor of the local geology andisotope and trace element values in human bone vary depending on the geology

Somerville, Andrew D.

2010-01-01T23:59:59.000Z

357

Inert Trace Constituent Transport in Sigma and Hybrid Isentropic–Sigma Models. Part I: Nine Advection Algorithms  

Science Conference Proceedings (OSTI)

The University of Wisconsin hybrid isentropic–sigma (?–?) coordinate channel model and the nominally identical sigma (?) model are used to test the relative capabilities of nine trace constituent transport algorithms. The nine are “standard” ...

Fred M. Reames; Tom H. Zapotocny

1999-02-01T23:59:59.000Z

358

Ray tracing for anisotropic media in singular directions of S 9iFODY##9DYU\\XN  

E-Print Network (OSTI)

of a wavefield and in the geometry of wave surfaces (Alshits & Lothe 1979; Alshits, Sarychev & Shuvalov 1985 on the inspection of behaviour of polarization vector of the traced wave whenever the ray approaches the singularity

Cerveny, Vlastislav

359

Factors influencing algal biomass in hydrologically dynamic salt ponds in a subtropical salt marsh  

E-Print Network (OSTI)

The interface between land and water is often a dynamic zone that responds to relatively short-term climatic and hydrologic forces. Coastal salt marshes occupy this zone between land and sea and typically are comprised of vegetated marsh intersected by channels and shallow ponds that are subject to flooding by winds, tides, and storm surges. Coastal salt marshes are widely regarded as zones of high macrophyte productivity. However, microalgae may contribute more to salt marsh productivity than previously realized, underscoring the importance of understanding algal dynamics in such systems. Benthic and planktonic chlorophyll-a (surrogate for total algal biomass), sediment AFDW, total suspended solids, salinity, and nutrients were examined in marsh ponds in the subtropical Guadalupe Estuary, TX, USA to determine the effects of hydrologic connections on algal biomass in this system. From May 2005 – May 2006 there were several pond connection, disconnection, and desiccation events. During periods of disconnection, algal biomass was higher in both the benthos and the water column than during connection events when supposed flushing occurred. Connection events also flushed out high NH4 accumulating in pond surface waters, but did not increase NOx. Therefore, the primary source of DIN seemed to be nutrient cycling within the ponds. There was a temporal effect on surface water salinity, which increased throughout the sampling period as bay water levels and subsequent pond connections decreased, demonstrating interannual variability and the link between seasons (wet vs. dry) and marsh inundation patterns (high water periods vs. low water periods) in this estuary.

Miller, Carrie J.

2007-05-01T23:59:59.000Z

360

The Dynamical Discrete Web  

E-Print Network (OSTI)

The dynamical discrete web (DDW), introduced in recent work of Howitt and Warren, is a system of coalescing simple symmetric one-dimensional random walks which evolve in an extra continuous dynamical parameter s. The evolution is by independent updating of the underlying Bernoulli variables indexed by discrete space-time that define the discrete web at any fixed s. In this paper, we study the existence of exceptional (random) values of s where the paths of the web do not behave like usual random walks and the Hausdorff dimension of the set of such exceptional s. Our results are motivated by those about exceptional times for dynamical percolation in high dimension by H\\"aggstrom, Peres and Steif, and in dimension two by Schramm and Steif. The exceptional behavior of the walks in DDW is rather different from the situation for dynamical random walks of Benjamini, H\\"aggstrom, Peres and Steif. In particular, we prove that there are exceptional values of s for which the walk from the origin S^s(n) has limsup S^s(n)/\\sqrt n \\leq K with a nontrivial dependence of the Hausdorff dimension on K. We also discuss how these and other results extend to the dynamical Brownian web, a natural scaling limit of DDW. The scaling limit is the focus of a paper in preparation; it was studied by Howitt and Warren and is related to the Brownian net of Sun and Swart.

L. R. G. Fontes; C. M. Newman; K. Ravishankar; E. Schertzer

2007-04-20T23:59:59.000Z

Note: This page contains sample records for the topic "nutrient dynamics trace" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

The Allegheny Power Service Constructed Wetland at Springdale: The Role of Plants in the Removal of Trace Elements  

Science Conference Proceedings (OSTI)

Constructed wetlands are proving an effective technology for the removal of many aqueous contaminants. The ability of wetlands to remove contaminants such as trace elements appears to be a function of both the physical trapping of suspended materials and the biological and chemical processes occurring within the wetlands. Thus, wetlands are commonly described as "biogeochemical reactors." This report details a study of trace element removal and sequestration within a highly engineered wetland designed to...

2001-11-05T23:59:59.000Z

362

Degradation of polychlorinated biphenyl mixtures in soil using phanerochaete chrysosporium in nutrient rich, non-ligninolytic conditions  

DOE Patents (OSTI)

Substantial degradation of polychlorinated biphenyl (PCB) mixtures is carried out using the white rot fungus Phanerochaete chrysosporium, under nutrient, carbon and nitrogen source rich, non-ligninolytic conditions. The PCBs with various numbers of ortho, meta, and para chlorines were extensively degraded, indicating relative nonspecificity for the position of chlorine substitutions on the biphenyl ring. Maximal degradation of PCBs in a mixture was observed in malt extract medium (18.4% on a molar basis), in which most of the individual PCBs were degraded.

Yadav, Jagjit S. (Cincinnatti, OH); Reddy, Chilekampalli A. (East Lansing, MI); Quensen, John F. (Haslett, MI); Tiedje, James M. (Lansing, MI)

2000-01-01T23:59:59.000Z

363

BOILING WATER REACTOR TRANSIENT INSTABILITY STUDIES OF RINGHALS 1 REACTOR USING TRACE COUPLED WITH PARCS.  

E-Print Network (OSTI)

??Reactor plant design often incorporates data and insight ascertained from computer code simulations of plant dynamics and reactor core behavior. Increasing utilization of data gathered… (more)

Walls, Robert

2009-01-01T23:59:59.000Z

364

Surface Chemical Dynamics  

NLE Websites -- All DOE Office Websites (Extended Search)

Surface Chemical Dynamics Surface Chemical Dynamics The goal of the Surface Chemical Dynamics Program is to elucidate the underlying physical processes that determine the products (selectivity) and yield (efficiency) of chemical transformations relevant to energy-related chemistry on catalytic and nanostructured surfaces. Achieving this end requires understanding the evolution of the reactant-molecule/surface complex as molecules adsorb, bonds dissociate, surface species diffuse, new bonds form and products desorb. The pathways and time scales of these processes are ultimately determined by a multidimensional potential energy surface that is a function of the geometric and electronic structures of the surface and the reactant, product, intermediate and transition-state molecular and atomic species.

365

MAX Fluid Dynamics facility  

NLE Websites -- All DOE Office Websites (Extended Search)

MAX Fluid Dynamics facility MAX Fluid Dynamics facility Capabilities Engineering Experimentation Reactor Safety Testing and Analysis Overview Nuclear Reactor Severe Accident Experiments MAX NSTF SNAKE Aerosol Experiments System Components Laser Applications Robots Applications Other Facilities Other Capabilities Work with Argonne Contact us For Employees Site Map Help Join us on Facebook Follow us on Twitter NE on Flickr MAX Fluid Dynamics facility Providing high resolution data for development of computational tools that model fluid flow and heat transfer within complex systems such as the core of a nuclear reactor. 1 2 3 4 5 Hot and cold air jets are mixed within a glass tank while laser-based anemometers and a high-speed infrared camera characterize fluid flow and heat transfer behavior. Click on image to view larger size image.

366

An investigation of the sub-grid variability of trace gases and aerosols for global climate modeling  

Science Conference Proceedings (OSTI)

One fundamental property and limitation of grid based models is their inability to identify spatial details smaller than the grid cell size. While decades of work have gone into developing sub-grid treatments for clouds and land surface processes in climate models, the quantitative understanding of sub-grid processes and variability for aerosols and their precursors is much poorer. In this study, WRF-Chem is used to simulate the trace gases and aerosols over central Mexico during the 2006 MILAGRO field campaign, with multiple spatial resolutions and emission/terrain scenarios. Our analysis focuses on quantifying the sub-grid variability (SGV) of trace gases and aerosols within a typical global climate model grid cell, i.e. 75x75 km2. Our results suggest that a simulation with 3-km horizontal grid spacing adequately reproduces the overall transport and mixing of trace gases and aerosols downwind of Mexico City, while 75-km horizontal grid spacing is insufficient to represent local emission and terrain-induced flows along the mountain ridge, subsequently affecting the transport and mixing of plumes from nearby sources. Therefore, the coarse model grid cell average may not correctly represent aerosol properties measured over polluted areas. Probability density functions (PDFs) for trace gases and aerosols show that secondary trace gases and aerosols, such as O3, sulfate, ammonium, and nitrate, are more likely to have a relatively uniform probability distribution (i.e. smaller SGV) over a narrow range of concentration values. Mostly inert and long-lived trace gases and aerosols, such as CO and BC, are more likely to have broad and skewed distributions (i.e. larger SGV) over polluted regions. Over remote areas, all trace gases and aerosols are more uniformly distributed compared to polluted areas. Both CO and O3 SGV vertical profiles are nearly constant within the PBL during daytime, indicating that trace gases are very efficiently transported and mixed vertically by turbulence. But, simulated horizontal variability indicates that trace gases and aerosols are not well mixed horizontally in the PBL. During nighttime the SGV for trace gases is maximum at the surface, and quickly decreases with height. Unlike the trace gases, the SGV of BC and secondary aerosols reaches a maximum at the PBL top during the day. The SGV decreases with distance away from the polluted urban area, has a more rapid decrease for long-lived trace gases and aerosols than for secondary ones, and is greater during daytime than nighttime. The SGV of trace gases and aerosols is generally larger than for meteorological quantities. Emissions can account for up to 50% of the SGV over urban areas such as Mexico City during daytime for less-reactive trace gases and aerosols, such as CO and BC. The impact of emission spatial variability on SGV decays with altitude in the PBL and is insignificant in the free troposphere. The emission variability affects SGV more significantly during daytime (rather than nighttime) and over urban (rather than rural or remote) areas. The terrain, through its impact on meteorological fields such as wind and the PBL structure, affects dispersion and transport of trace gases and aerosols and their SGV.

Qian, Yun; Gustafson, William I.; Fast, Jerome D.

2010-07-29T23:59:59.000Z

367

Substructured multibody molecular dynamics.  

SciTech Connect

We have enhanced our parallel molecular dynamics (MD) simulation software LAMMPS (Large-scale Atomic/Molecular Massively Parallel Simulator, lammps.sandia.gov) to include many new features for accelerated simulation including articulated rigid body dynamics via coupling to the Rensselaer Polytechnic Institute code POEMS (Parallelizable Open-source Efficient Multibody Software). We use new features of the LAMMPS software package to investigate rhodopsin photoisomerization, and water model surface tension and capillary waves at the vapor-liquid interface. Finally, we motivate the recipes of MD for practitioners and researchers in numerical analysis and computational mechanics.

Grest, Gary Stephen; Stevens, Mark Jackson; Plimpton, Steven James; Woolf, Thomas B. (Johns Hopkins University, Baltimore, MD); Lehoucq, Richard B.; Crozier, Paul Stewart; Ismail, Ahmed E.; Mukherjee, Rudranarayan M. (Rensselaer Polytechnic Institute, Troy, NY); Draganescu, Andrei I.

2006-11-01T23:59:59.000Z

368

Measuring Cellular-scale Nutrient Distribution in Algal Biofilms with Synchrotron Confocal Infrared Microspectroscopy  

Science Conference Proceedings (OSTI)

The microscope and infrared spectrometer are two of the most useful tools for the study of biological materials, and their combined analytical power far exceeds the sum of the two. Performing molecular spectroscopy through a microscope superimposes chemical information onto the physical microstructure obtained from the optical microscope when visible and infrared information are collected under the same conditions. The instrument developments that enable current infrared microspectroscopic studies began with the introduction of the first research-grade infrared microscope, patented in 1989 (1). By 1993, published reports using this method to determine macroalgae (seaweed) cell-wall composition appeared (2-4). Since these initial reports, the use of infrared microspectroscopy (IMS) in microalgal (single cells or groups of cells) research has grown. Primarily, cultured algae have been used to hone IMS methodology and evaluate its capabilities in algal research (5-8). Studies involving natural, mixed species assemblages, which can utilize the spatial resolution potential of this technique fully are rare (9-11). For instance, in a recent review of IMS microalgal ecological research (12), only 3 of the 29 peer-reviewed publications investigated natural algal assemblages. Both thermal and synchrotron infrared sources provide a resolution capable of measuring individual algae in mixed species assemblages, and each has its advantages. For example, thermal source IMS is more accessible, allowing more samples to be analyzed than synchrotron IMS. However, synchrotron IMS with confocal masking provides superior resolution, which can be critical in isolating small or contiguous cells. Algal ecology is the study of the interaction between algae and their environment. Infrared microspectroscopy addresses a major logistical problem in this field, obtaining species-specific cellular biochemical information from natural, mixed-species assemblages (11,12). Benthic (bottom-dwelling) algae, for example, grow in a three-dimensional matrix (biofilm) composed of different cell sizes, shapes, and configurations. The optical and ecological challenge of studying algae is apparent from Figure 1, which shows a photomicrograph of algal chlorophyll fluorescence on a rock. Several issues make it difficult to obtain single species measurements with standard techniques: cell sizes can vary over an order of magnitude; species can occur as single cells, long filaments, or globular colonies; a number of different species can be found within a few square millimeters; and fluorescence can vary across cells (that is, the physiological state varies across cells). Synchrotron IMS is a tool that can be used to begin to overcome these spatially related challenges by giving a species- and location-specific measurement of an individual alga's relative chemical composition and distribution. This technique enables algal ecologists to focus on new, ecologically relevant questions such as what level (that is, cell, colony, and population) best defines a species' response to environmental change. For instance, many species occur as single cells and thus can be measured as individual organisms. However, the variety of growth forms and sizes can make it difficult to define the best unit to measure multicellular groups in terms of its functional role such as primary productivity (that is, carbon incorporation) and nutrient cycling. Understanding how individual algal species within a diverse community respond to environmental changes can help predict how changes in assemblage structure will impact overall assemblage function.

J Murdock; W Dodds; J Reffner; D Wetzel

2011-12-31T23:59:59.000Z

369

UNIVERSITY OF WISCONSIN EXTENSION PUBLICATION A3794Whole-Farm Nutrient Management on Dairy Farms to Improve Profitability and Reduce Environmental Impacts  

E-Print Network (OSTI)

body of knowledge exists about livestock waste and nutrient management, but that the development and implementation of manure and animal waste best management practices is limited by lack of integration of research and extension information. A collaborative project was initiated to define and evaluate nutrient management tools developed and used in New York and Wisconsin that are applicable across regions, and tools or models that are region specific but whose approach and structure may be applicable across regions. This document is the final report of the project. It contains outlines of nine nutrient management tools used in New York or Wisconsin and provides readers with comparative reviews of the tools to aid in tool selection. Model developers and agricultural educators can use this information to improve their nutrient management research and teaching efforts. In addition to software evaluations, this project report describes the dairy production systems and state regulatory environments and gives an overview of three university courses developed to address nutrient management issues in New York and Wisconsin. The primary audiences for this project are researchers, extension personnel and other professionals that generate knowledge and provide assistance to dairy farmers in issues related to feed, fertilizer and manure management. Find out more about this project by visiting:

unknown authors

2004-01-01T23:59:59.000Z

370

Introduction to Accelerated Molecular Dynamics  

SciTech Connect

Molecular Dynamics is the numerical solution of the equations of motion of a set of atoms, given an interatomic potential V and some boundary and initial conditions. Molecular Dynamics is the largest scale model that gives unbiased dynamics [x(t),p(t)] in full atomistic detail. Molecular Dynamics: is simple; is 'exact' for classical dynamics (with respect to a given V); can be used to compute any (atomistic) thermodynamical or dynamical properties; naturally handles complexity -- the system does the right thing at the right time. The physics derives only from the interatomic potential.

Perez, Danny [Los Alamos National Laboratory

2012-07-10T23:59:59.000Z

371

Introduction to Accelerated Molecular Dynamics  

SciTech Connect

Molecular Dynamics is the numerical solution of the equations of motion of a set of atoms, given an interatomic potential V and some boundary and initial conditions. Molecular Dynamics is the largest scale model that gives unbiased dynamics [x(t),p(t)] in full atomistic detail. Molecular Dynamics: is simple; is 'exact' for classical dynamics (with respect to a given V); can be used to compute any (atomistic) thermodynamical or dynamical properties; naturally handles complexity -- the system does the right thing at the right time. The physics derives only from the interatomic potential.

Perez, Danny [Los Alamos National Laboratory

2012-07-10T23:59:59.000Z

372

Model for trace metal exposure in filter-feeding flamingos at alkaline Rift Valley Lake, Kenya  

SciTech Connect

Toxic trace metals have been implicated as a potential cause of recent flamingo kills at Lake Nakuru, Kenya. Chromium (Cr), copper (Cu), lead (Pb), and zinc (Zn) have accumulated in the lake sediments as a result of unregulated discharges and because this alkaline lake has no natural outlet. Lesser flamingos (Phoeniconaias minor) at Lake Nakuru feed predominantly on the cyanobacterium Spirulina platensis, and because of their filter-feeding mechanism, they are susceptible to exposure to particle-bound metals. Trace metal adsorption isotherms to lake sediments and S. platensis were obtained under simulated lake conditions, and a mathematical model was developed to predict metal exposure via filter feeding based on predicted trace metal phase distribution. Metal adsorption to suspended solids followed the trend Pb {much_gt} Zn > Cr > Cu, and isotherms were linear up to 60 {micro}g/L. Adsorption to S. platensis cells followed the trend Pb {much_gt} Zn > Cu > Cr and fit Langmuir isotherms for Cr, Cu and Zn and a linear isotherm for Pb. Predicted phase distributions indicated that Cr and Pb in Lake Nakuru are predominantly associated with suspended solids, whereas Cu and Zn are distributed more evenly between the dissolved phase and particulate phases of both S. platensis and suspended solids. Based on established flamingo feeding rates and particle size selection, predicted Cr and Pb exposure occurs predominantly through ingestion of suspended solids, whereas Cu and Zn exposure occurs through ingestion of both suspended solids and S. platensis. For the lake conditions at the time of sampling, predicted ingestion rates based on measured metal concentrations in lake suspended solids were 0.71, 6.2, 0.81, and 13 mg/kg-d for Cr, Cu, Pb, and Zn, respectively.

Nelson, Y.M.; DiSante, C.J.; Lion, L.W. [Cornell Univ., Ithaca, NY (United States). School of Civil and Environmental Engineering; Thampy, R.J.; Raini, J.A. [Worldwide Fund for Nature, Nakuru (Kenya). Lake Nakuru Conservation and Development Project; Motelin, G.K. [Egerton Univ., Njoro (Kenya). Dept. of Animal Health

1998-11-01T23:59:59.000Z

373

An Ocean Dynamical Thermostat  

Science Conference Proceedings (OSTI)

The role of ocean dynamics in the regulation of tropical sea surface temperatures (SSTs) is investigated using the Zebiak-Cane coupled occan-atmosphere model. The model is forced with a uniform heating, or cooling, varying between ±40 W m?2 into ...

Amy C. Clement; Richard Seager; Mark A. Cane; Stephen E. Zebiak

1996-09-01T23:59:59.000Z

374

Neutron Scattering and Dynamics  

Science Conference Proceedings (OSTI)

... "Molecule" H2O (N2)0.8(O2)0.2 Al Cd sigma_s barn 168.3 20.1 1.5 6.5 ... 31 Collective dynamics Animation courtesy of A. Zheludev (ORNL) ...

2009-09-15T23:59:59.000Z

375

Tropical Cyclone Eye Dynamics  

Science Conference Proceedings (OSTI)

A new perspective of the dynamics of a tropical cyclone eye is given in which eye subsidence and the adiabatic warming accompanying it are accounted for directly from the equations of motion. Subsidence is driven by an adverse, axial gradient of ...

R. K. Smith

1980-06-01T23:59:59.000Z

376

Bütschli dynamic droplet system  

Science Conference Proceedings (OSTI)

Dynamical oil-water systems such as droplets display lifelike properties and may lend themselves to chemical programming to perform useful work, specifically with respect to the built environment. We present Bütschli water-in-oil droplets as a model ... Keywords: Otto Bütschli, architecture, droplet, living technology, olive oil, origins of life

Rachel Armstrong; Martin Hanczyc

2013-10-01T23:59:59.000Z

377

BLOWER SYSTEM DYNAMICS  

SciTech Connect

An analysis is presented of the dynamics of a turboblower acting together with its connecting circuit. This is to be distinguished from the aero- thermodynamics involved in the design of the blower itself. The effect on system stability of blower and circuit characteristics is discussed. (auth)

Furgerson, W.T.

1958-04-16T23:59:59.000Z

378

Entanglement dynamics during decoherence  

Science Conference Proceedings (OSTI)

The evolution of the entanglement between oscillators that interact with the same environment displays highly non-trivial behavior in the long time regime. When the oscillators only interact through the environment, three dynamical phases were identified ... Keywords: 03.65.Yz, 03.67.Bg, 03.67.Mn, 05.40.Jc, Decoherence, Entanglement, Quantum Brownian Motion

Juan Pablo Paz; Augusto J. Roncaglia

2009-12-01T23:59:59.000Z

379

Method for determining trace quantities of chloride in polymeric materials using ion selective electrodes: Final report  

Science Conference Proceedings (OSTI)

A method for determining trace quantities of chloride in polymeric materials has been developed. Ion-selective electrodes and the standard addition method were used in all the analyses. The ion-selective electrode method was compared with neutron activation, ion chromatography and chloridometer titration. The ion-selective electrode technique results for chloride were similar to those of neutron activation, which is the acknowledged referee method. This ion-selective electrode method showed the highest standard recovery when compared with the ion chromatography and chloridometer titration methods.

Salary, J.

1987-02-01T23:59:59.000Z

380

Trace metal contamination of waters, sediments, and organisms of the Swan Lake area of Galveston Bay  

E-Print Network (OSTI)

Swan Lake is a sub-bay of the Galveston Bay system. The area received runoff from a tin smelter via the Wah Chang Ditch which ran through it in the past but the ditch is now cut off by a hurricane protection levee. An industrial waste disposal facility (Gulf Coast Waste Disposal Authority) is located north of the Wah Chang Ditch. Consequently there have been concerns about possible metal contamination in this area. I determined trace metal concentrations in water, sediments, and organisms (oyster, mussel, snail, crab, fish, shrimp, and spartina) in the area. Sediments and organisms were analyzed for total Ag, Al, As, Cd, Cu, Fe, Hg, Mn, Ni, Pb, Se, Sn, and Zn. Water samples were analyzed for Cd, Cu, Fe, Mn, and Sn. The variabilities and geographic trends in sediment trace metals indicated that waste disposal and airborne inputs from facilities located at the Tex Tin site were likely sources for metal pollution found in the sediments. Sediments in the study area showed elevated trace metals relative to Galveston Bay and other Texas bay sediments. Three different samplings of the Wah Chang Ditch showed no temporal patterns in metal distribution in the sediments. Lead especially was uniformly high on the three different trips, respectively averaging 1250 (Trip 1), 893 (Trip H), and 1350 ppm (Trip V). Metal enrichments at depth in the sediment column indicated that the Swan Lake area has recently received less input of metal contaminated sediment than in the past. Anthropogenic inputs did not greatly influence the natural concentrations of Fe, Al, and Ni in sediments either in the past or at present. Most organisms showed very small spatial variations. However, the oysters in Swan Lake are enriched in most metals relative to Galveston Bay and other U. S. Gulf of Mexico oysters. The mussels in this study do not reflect the unusually elevated environmental metal concentration in the sediments from which they were taken. Iron and Pb concentrations in oysters seemed to be directly related to sediment concentrations at each location. Oysters show higher concentrations in most metals than those in mussels. The Zn level was II 3 times higher in oysters. For organisms collected from the Swan Lake area trace metal concentrations were generally in the order oysters > snail > crab > shrimp > fish. Metal concentrations in Wah Chang Ditch water were very elevated relative to those of the Brazos River and Galveston Bay and closely reflect those in sediments of the Wah Chang Ditch.

Park, Junesoo

1995-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "nutrient dynamics trace" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Analytic formulae for centrifugal effects on turbulent transport of trace impurities in tokamak plasmas  

Science Conference Proceedings (OSTI)

A local gyrokinetic description of the centrifugal effects on impurity transport in tokamak plasmas is presented, which extends previous models with the inclusion of the gradient of the background toroidal angular velocity in the equilibrium distribution. The equations are implemented in a gyrokinetic code. An analytical model is derived and formulae are proposed which allow the calculation of centrifugal effects on impurity transport in the limit where centrifugal effects are large only for heavy impurities in trace concentration, but are negligible for the bulk plasma. The analytic formulae are shown to be in quantitative agreement with the numerical results and are proposed for complementing present transport models.

Angioni, C.; Casson, F. J.; Veth, C. [Max-Planck-Institut fuer Plasmaphysik, IPP-EURATOM Association, D-85748 Garching bei Muenchen (Germany); Peeters, A. G. [Physics Department, University of Bayreuth, 95440 Bayreuth (Germany)

2012-12-15T23:59:59.000Z

382

Sub-microradian Surface Slope Metrology with the ALS Developmental Long Trace Profiler  

Science Conference Proceedings (OSTI)

A new low budget slope measuring instrument, the Developmental Long Trace Profiler (DLTP), was recently brought to operation at the ALS Optical Metrology Laboratory. The design, instrumental control and data acquisition system, initial alignment and calibration procedures, as well as the developed experimental precautions and procedures are described in detail. The capability of the DLTP to achieve sub-microradian surface slope metrology is verified via cross-comparison measurements with other high performance slope measuring instruments when measuring the same high quality test optics. The directions of future work to develop a surface slope measuring profiler with nano-radian performance are also discussed.

Yashchuk, Valeriy V; Barber, Samuel; Domning, Edward E.; Kirschman, Jonathan L.; Morrison, Gregory Y.; Smith, Brian V; Siewert, Frank; Zeschke, Thomas; Geckeler, Ralf; Just, Andreas

2009-09-11T23:59:59.000Z

383

Trace metal speciation in saline waters affected by geothermal brines. [GEOCHEM  

DOE Green Energy (OSTI)

A description is given of the chemical equilibrium computer program GEOCHEM, which has been developed to calculate trace element speciation in soil, irrigation, drainage, or Salton Sea waters affected by geothermal brine. GEOCHEM is applied to irrigation water-brine mixtures and to Salton Sea water-brine mixtures in order to compute the chemical speciation of the elements Cd, Cu, Hg, Ni, Pb, and Zn, along with the oxyanions of As and B. The results suggest that the computer simulation can have an important effect on a program for managing brine spills. Appendices include published papers on related research.

Sposito, G.; Page, A.L.

1977-11-01T23:59:59.000Z

384

Water vapour H2O 0.3 Hydrogen Sulphide H2S Traces  

E-Print Network (OSTI)

A system approach to biogas technology from "Biogas technology: a training manual for extension " (FAO/CMS, 1996) Components of a biogas system Biogas technology is a complete system in itself with its set objectives (cost effective production of energy and soil nutrients), factors such as microbes, plant design, construction materials, climate, chemical and microbial characteristics of inputs, and the inter-relationships among these factors. Brief discussions on each of these factors or subsystems are presented in this section. Biogas This is the mixture of gas produced by methanogenic bacteria while acting upon biodegradable materials in an anaerobic condition. Biogas is mainly composed of 50 to 70 percent methane, 30 to 40 percent carbon dioxide (CO2) and low amount of other gases as shown in Table 1.

Source Yadav

1997-01-01T23:59:59.000Z

385

Cloud computing for dynamic systems  

Science Conference Proceedings (OSTI)

Cloud computing is a fast emerging model for enabling dynamic on-demand computing and IT-based services. It promotes dynamic properties and characteristics such as scalability, agility, flexibility, virtualised and distributed on-demand computing. However, ...

Khaled Sabry

2011-11-01T23:59:59.000Z

386

Dynamic Scaling of Manipulator Trajectories  

E-Print Network (OSTI)

A fundamental time-scaling property of manipulator dynamics has been identified that allows modification of movement speed without complete dynamics recalculation. By exploiting this property, it can be determined ...

Hollerbach, John M.

1983-01-01T23:59:59.000Z

387

NETL: Energy System Dynamics Focus Area  

NLE Websites -- All DOE Office Websites (Extended Search)

Energy System Dynamics Onsite Research Energy System Dynamics Energy System Dynamics (ESD) is a focus area of the National Energy Technology Laboratory's Office of Research and...

388

Shared and Dynamic Libraries on Edison  

NLE Websites -- All DOE Office Websites (Extended Search)

Shared and Dynamic Libraries Shared and Dynamic Libraries The Edison system can support applications that use dynamic shared libraries (DSL) on the compute nodes. Some...

389

Dynamic Worldwide Solar Energy | Open Energy Information  

Open Energy Info (EERE)

Dynamic Worldwide Solar Energy Jump to: navigation, search Name Dynamic Worldwide Solar Energy Sector Solar Product US-based solar developer and financer. References Dynamic...

390

Cell Dynamics and Process Control  

Science Conference Proceedings (OSTI)

ALUMINIUM REDUCTION TECHNOLOGY VII: Cell Dynamics And Process ... WITH RELEVANS TO POINT FEEDING ALUMINIUM CELL: Ove Kobbeltvedt, ...

391

Dynamic Behavior of Materials VI  

Science Conference Proceedings (OSTI)

Capturing Microstructural Features Related to Dynamic Damage Nucleation ... Structural Alumina during Low Velocity Impact Used in Protective Systems.

392

An in situ approach to study trace element partitioning in the laser heated diamond anvil cell  

Science Conference Proceedings (OSTI)

Data on partitioning behavior of elements between different phases at in situ conditions are crucial for the understanding of element mobility especially for geochemical studies. Here, we present results of in situ partitioning of trace elements (Zr, Pd, and Ru) between silicate and iron melts, up to 50 GPa and 4200 K, using a modified laser heated diamond anvil cell (DAC). This new experimental set up allows simultaneous collection of x-ray fluorescence (XRF) and x-ray diffraction (XRD) data as a function of time using the high pressure beamline ID27 (ESRF, France). The technique enables the simultaneous detection of sample melting based to the appearance of diffuse scattering in the XRD pattern, characteristic of the structure factor of liquids, and measurements of elemental partitioning of the sample using XRF, before, during and after laser heating in the DAC. We were able to detect elements concentrations as low as a few ppm level (2-5 ppm) on standard solutions. In situ measurements are complimented by mapping of the chemical partitions of the trace elements after laser heating on the quenched samples to constrain the partitioning data. Our first results indicate a strong partitioning of Pd and Ru into the metallic phase, while Zr remains clearly incompatible with iron. This novel approach extends the pressure and temperature range of partitioning experiments derived from quenched samples from the large volume presses and could bring new insight to the early history of Earth.

Petitgirard, S.; Mezouar, M. [European Synchrotron Radiation Facility (ESRF), 6 rue Jules Horowitz, BP 220, 38043 Grenoble (France); Borchert, M.; Appel, K.; Liermann, H.-P. [Deutsches Elektronen-Synchrotron (DESY), Notkestrasse 85, 22607 Hamburg (Germany); Andrault, D. [Universite Blaise Pascal, Laboratoire des Magmas and Volcans, 5 rue Kessler 63038, Clermont-Ferrand (France)

2012-01-15T23:59:59.000Z

393

TRACE/PARCS analysis of the OECD/NEA Oskarshamn-2 BWR stability benchmark  

Science Conference Proceedings (OSTI)

On February 25, 1999, the Oskarshamn-2 NPP experienced a stability event which culminated in diverging power oscillations with a decay ratio of about 1.4. The event was successfully modeled by the TRACE/PARCS coupled code system, and further analysis of the event is described in this paper. The results show very good agreement with the plant data, capturing the entire behavior of the transient including the onset of instability, growth of the oscillations (decay ratio) and oscillation frequency. This provides confidence in the prediction of other parameters which are not available from the plant records. The event provides coupled code validation for a challenging BWR stability event, which involves the accurate simulation of neutron kinetics (NK), thermal-hydraulics (TH), and TH/NK. coupling. The success of this work has demonstrated the ability of the 3-D coupled systems code TRACE/PARCS to capture the complex behavior of BWR stability events. The problem was released as an international OECD/NEA benchmark, and it is the first benchmark based on measured plant data for a stability event with a DR greater than one. Interested participants are invited to contact authors for more information. (authors)

Kozlowski, T. [Univ. of Illinois, Urbana-Champaign, IL (United States); Downar, T.; Xu, Y.; Wysocki, A. [Univ. of Michigan, Ann Arbor, MI (United States); Ivanov, K.; Magedanz, J.; Hardgrove, M. [Pennsylvania State Univ., Univ. Park, PA (United States); March-Leuba, J. [Oak Ridge National Laboratory, Oak Ridge, TN (United States); Hudson, N.; Woodyatt, D. [Nuclear Regulatory Commission, Rockville, MD (United States)

2012-07-01T23:59:59.000Z

394

Concentration of major and trace elements in the Miocene lignite from the Canakkale-Can coalfield  

SciTech Connect

This study focuses on major and trace element concentrations of three lignite samples, of which two are from the working lignite seam and one from a feed coal to an thermal power plant. The Canakkale-Can lignite deposit is currently being mined by open-cast mining methods despite its high sulfur content. The production lignites are mainly consumed by a fluidized-bed thermal power plant with 2 160 MW capacity and less domestic heating and industrial factories around Can. Major oxide compositions of the coal ash samples imply that the more abundant oxides are SiO{sub 2} and Al{sub 2}O{sub 3} and less CaO and Fe2O{sub 3}. Trace element concentrations in the samples on whole-coal basis show that three samples analyzed were enriched in V, and also concentrations of B, Sc, Sn, Th, Tl, and U in one sample that exceed the range values of most world coals.

Inaner, H.; Karayigit, A. [Dokuz Eylul University, Izmir (Turkey). Dept. of Geological Engineering

2008-07-01T23:59:59.000Z

395

Simulations of greenhouse trace gases using the Los Alamos chemical tracer model  

SciTech Connect

Through three-dimensional global model studies on atmospheric composition and transport, we are improving our quantitative understanding of the origins and behavior of trace gases that affect Earth's radiative energy balance and climate. We will focus, in this paper, on the simulations of three individual trace gases including CFC-11, methyl chloroform, and methane. We first used our chemical tracer model to study the global distribution and trend of chemically inert CFC-11 observed by the Atmospheric Lifetime Experiment. The results show that the model has the ability to reproduce the time-series of the observations. The purpose of this CFC-11 simulation was to test the transport of the model. We then used to model introduce methyl chloroform into the atmosphere according to the known emission patterns and iteratively varied OH fields so that the observed concentrations of methyl chloroform from the observations could be simulated well. The rationale behind this approach is that the reaction with OH is the dominant sink for metyl chloroform and the transport of the model has been tested in the previous CFC-11 study. Finally, using the inferred OH distributions, we conducted a steady-state simulation to reproduce the current methane distribution. The general agreement between the modeled an observed methane surface concentrations has laid a foundation for the simulation of the transient increase of methane.

Kao, C.Y.J.; Morz, E. (Los Alamos National Lab., NM (United States)); Tie, X. (Scripps Institution of Oceanography, San Diego, CA (United States))

1991-11-01T23:59:59.000Z

396

Simulations of greenhouse trace gases using the Los Alamos chemical tracer model  

SciTech Connect

Through three-dimensional global model studies on atmospheric composition and transport, we are improving our quantitative understanding of the origins and behavior of trace gases that affect Earth`s radiative energy balance and climate. We will focus, in this paper, on the simulations of three individual trace gases including CFC-11, methyl chloroform, and methane. We first used our chemical tracer model to study the global distribution and trend of chemically inert CFC-11 observed by the Atmospheric Lifetime Experiment. The results show that the model has the ability to reproduce the time-series of the observations. The purpose of this CFC-11 simulation was to test the transport of the model. We then used to model introduce methyl chloroform into the atmosphere according to the known emission patterns and iteratively varied OH fields so that the observed concentrations of methyl chloroform from the observations could be simulated well. The rationale behind this approach is that the reaction with OH is the dominant sink for metyl chloroform and the transport of the model has been tested in the previous CFC-11 study. Finally, using the inferred OH distributions, we conducted a steady-state simulation to reproduce the current methane distribution. The general agreement between the modeled an observed methane surface concentrations has laid a foundation for the simulation of the transient increase of methane.

Kao, C.Y.J.; Morz, E. [Los Alamos National Lab., NM (United States); Tie, X. [Scripps Institution of Oceanography, San Diego, CA (United States)

1991-11-01T23:59:59.000Z

397

Source characterization studies at the Paraho semiworks oil shale retort. [Redistribution of trace and major elements  

DOE Green Energy (OSTI)

In order to determine the redistribution of trace and major elements and species during aboveground oil shale retorting, a comprehensive program was carried out for the sampling and analysis of feedstock, products, effluents, and ambient particulates from the Paraho Semiworks Retort. Samples were obtained during two periods in 1977 when the retort was operating in the direct mode. The data were used to construct mass balances for 31 trace and major elements in various effluents, including the offgas. The computed mass balances indicated that approx. 1% or greater fractions of the As, Co, Hg, N, Ni, S, and Se were released during retorting and redistributed to the product oil, retort water, or product offgas. The fraction released for these seven elements ranged from approx. 1% for Co and Ni to 50 to 60% for Hg and N. Approximately 20% of the S and 5% each of the As and Se were released. Ambient aerosols were found to be elevated near the retorting facility and associated crushing and retorted shale disposal sites. Approximately 50% of these particles were in the respirable range (< 5 ..mu..m). The elevated dust loadings are presented very local, as indicated by relatively low aerosol loadings at background sites 100 to 200 m away. State-of-the-art dust control measures were not employed. 15 figures, 19 tables.

Fruchter, J.S.; Wilkerson, C.L.; Evans, J.C.; Sanders, R.W.; Abel, K.W.

1979-05-01T23:59:59.000Z

398

Trace formulae for non-equilibrium Casimir interactions, heat radiation and heat transfer for arbitrary objects  

E-Print Network (OSTI)

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.

Matthias Krüger; Giuseppe Bimonte; Thorsten Emig; Mehran Kardar

2012-07-02T23:59:59.000Z

399

Diagnostics of nitrogen plasma by trace rare-gas-optical emission spectroscopy  

SciTech Connect

Trace rare-gas-optical emission spectroscopy is carried out to characterize the nitrogen plasma as a function of discharge parameters. The functional dependence of N{sub 2}(C {sup 3}{pi}{sub u}) and N{sub 2}{sup +}(B {sup 2}{sigma}{sub u}{sup +}) excited states is monitored by measuring the emission intensities of the bandheads of second positive and first negative systems. The excited-state population density of N atoms and N{sub 2} molecules, extracted from their optical emission, is related to the ground-state population density after normalizing the changes for excitation cross section and electron energy distribution function by optical actinometry. The electron temperature is determined from the plasma-induced optical emission of trace rare gas by the line-to-line method. The obtained data may help us to adjust the optimum discharge conditions for the production of active species, which are considered to be important for the desired treatment of the samples.

Qayyum, A.; Zeb, Shaista; Naveed, M.A.; Ghauri, S.A.; Zakaullah, M.; Waheed, A. [Department of Physics, Quaid-i-Azam University, 45320 Islamabad (Pakistan); Pakistan Institute of Nuclear Science and Technology (PINSTECH), P.O. Box 2151, 44000 Islamabad (Pakistan)

2005-11-15T23:59:59.000Z

400

Interaction between economic dynamical systems  

Science Conference Proceedings (OSTI)

The paper considers economic dynamical systems, the state spaces being the Riemannian manifolds. Between two economic dynamical systems, global feedforward and the feedback interaction is defined and the connection between their linearization and prolongation ... Keywords: economic dynamical system, economic flow, feedback, feedforward, linearization, prolongation by derivation

Constantin Patrascoiu

2009-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "nutrient dynamics trace" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Accelerated Molecular Dynamics Methods  

NLE Websites -- All DOE Office Websites (Extended Search)

Dynamics Methods Dynamics Methods for Infrequent Events Arthur F. Voter Theoretical Division Los Alamos National Laboratory Los Alamos, New Mexico U.S. Department of Energy Theory Focus Session on Hydrogen Storage Materials Crystal City, VA May 18, 2006 Los Alamos Acknowledgments Blas P. Uberuaga (LANL, MST-8) Francesco Montalenti (U. Milano-Bicocca) Graeme Henkelman (U. Texas at Austin) Timothy C. Germann (LANL, X-7) James A. Sprague (NRL) Mads Sorensen (Novo Nordisk A/S, Copenhagen) Sriram Swaminarayan (LANL, MST-8) Steve Stuart (Clemson) David Sholl (Carnegie Mellon) John Hamilton (Sandia) Wolfgang Windl (Ohio State) Roger Smith (U. Loughborough) Robin Grimes (Imperial College) Kurt Sickafus (LANL, MST-8) Jacques Amar (U. Toledo) DOE Office of Basic Energy Sciences Motorola Intel Los Alamos Outline

402

Critical dynamics and decoherence  

SciTech Connect

We study dynamics of decoherence in a generic model where the environment is driven and undergoes a quantum phase transition. We model the environment by the Ising chain in the transverse field, and assume that the decohering system is a central spin-1/2. We found that when the environment is quenched slowly through the critical point, the decoherence factor of the central spin undergoes rapid decay that encodes the critical exponents of the environment. We also found that decoherence in a non-equilibrated, kink-contaminated, environment can be stronger than in a vacuum one. We derived a remarkably simple analytical expression that describes post-transition decoherence and predicts periodicities involving all system parameters. This research connects the fields of decoherence, quantum phase transitions, and Kibble-Zurek non-equilibrium dynamics.

Damski, Bogdan [Los Alamos National Laboratory; Quan, Haitao T [Los Alamos National Laboratory; Zurek, Wojciech H [Los Alamos National Laboratory

2009-01-01T23:59:59.000Z

403

Social Dynamics of Science  

E-Print Network (OSTI)

The birth and decline of disciplines are critical to science and society. However, no quantitative model to date allows us to validate competing theories of whether the emergence of scientific disciplines drives or follows the formation of social communities of scholars. Here we propose an agent-based model based on a \\emph{social dynamics of science,} in which the evolution of disciplines is guided mainly by the social interactions among scientists. We find that such a social theory can account for a number of stylized facts about the relationships between disciplines, authors, and publications. These results provide strong quantitative support for the key role of social interactions in shaping the dynamics of science. A "science of science" must gauge the role of exogenous events, such as scientific discoveries and technological advances, against this purely social baseline.

Sun, Xiaoling; Milojevi?, Staša; Flammini, Alessandro; Menczer, Filippo

2013-01-01T23:59:59.000Z

404

Dynamic radioactive particle source  

SciTech Connect

A method and apparatus for providing a timed, synchronized dynamic alpha or beta particle source for testing the response of continuous air monitors (CAMs) for airborne alpha or beta emitters is provided. The method includes providing a radioactive source; placing the radioactive source inside the detection volume of a CAM; and introducing an alpha or beta-emitting isotope while the CAM is in a normal functioning mode.

Moore, Murray E.; Gauss, Adam Benjamin; Justus, Alan Lawrence

2012-06-26T23:59:59.000Z

405

Speciation of Trace Elements in Biological and Environmental Samples by X-ray Absorption Spectroscopy: The Role of Plants and Microbes in Remediation  

Science Conference Proceedings (OSTI)

Plants can accumulate, detoxify, and transform trace elements present in contaminated soil and water, leading to the phytoremediation of contaminated sites. An important factor for consideration is the chemical form of trace elements accumulated in tissues of different plant species used for phytoremediation. This report describes the use of X-ray absorption spectroscopy (XAS) for successfully determining the speciation of trace elements in biological and environmental samples.

2001-11-21T23:59:59.000Z

406

A New Formulation of the Exchange of Mass and Trace Constituents between the Stratosphere and Troposphere  

Science Conference Proceedings (OSTI)

Using a dynamical definition of the tropopause, a diagnostic model of stratosphere–troposphere exchange is presented. The net transport across the tropopause is independent of the vertical coordinate. When the transport is partitioned into ...

Ming-Ying Wei

1987-10-01T23:59:59.000Z

407

Lithium chloride protects retinal neurocytes from nutrient deprivation by promoting DNA non-homologous end-joining  

SciTech Connect

Lithium chloride is a therapeutic agent for treatment of bipolar affective disorders. Increasing numbers of studies have indicated that lithium has neuroprotective effects. However, the molecular mechanisms underlying the actions of lithium have not been fully elucidated. This study aimed to investigate whether lithium chloride produces neuroprotective function by improving DNA repair pathway in retinal neurocyte. In vitro, the primary cultured retinal neurocytes (85.7% are MAP-2 positive cells) were treated with lithium chloride, then cultured with serum-free media to simulate the nutrient deprived state resulting from ischemic insult. The neurite outgrowth of the cultured cells increased significantly in a dose-dependent manner when exposed to different levels of lithium chloride. Genomic DNA electrophoresis demonstrated greater DNA integrity of retinal neurocytes when treated with lithium chloride as compared to the control. Moreover, mRNA and protein levels of Ligase IV (involved in DNA non-homologous end-joining (NHEJ) pathway) in retinal neurocytes increased with lithium chloride. The end joining activity assay was performed to determine the role of lithium on NHEJ in the presence of extract from retinal neurocytes. The rejoining levels in retinal neurocytes treated with lithium were significantly increased as compared to the control. Furthermore, XRCC4, the Ligase IV partner, and the transcriptional factor, CREB and CTCF, were up-regulated in retinal cells after treating with 1.0 mM lithium chloride. Therefore, our data suggest that lithium chloride protects the retinal neural cells from nutrient deprivation in vitro, which may be similar to the mechanism of cell death in glaucoma. The improvement in DNA repair pathway involving in Ligase IV might have an important role in lithium neuroprotection. This study provides new insights into the neural protective mechanisms of lithium chloride.

Zhuang Jing; Li Fan; Liu Xuan; Liu Zhiping; Lin Jianxian [State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, 54 S Xianlie Road, Guangzhou, Guangdong 510060 (China); Ge Yihong [Department of Stomatology, the Southern Medical University (China); Kaminski, Joseph M. [National Institute of Allergy and Infectious Diseases, Division of Allergy, Immunology, and Transplantation, University of South Alabama (United States); Summers, James Bradley [Department of Radiology, University of South Alabama (United States); Wang Zhichong [State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, 54 S Xianlie Road, Guangzhou, Guangdong 510060 (China); Ge Jian [State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, 54 S Xianlie Road, Guangzhou, Guangdong 510060 (China)], E-mail: gejian@mail.sysu.edu.cn; Yu Keming [State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, 54 S Xianlie Road, Guangzhou, Guangdong 510060 (China)], E-mail: yukeming@mail.sysu.edu.cn

2009-03-13T23:59:59.000Z

408

Abstracts from a workshop on processes determining the input, behavior and fate of radionuclides and trace elements in continental shelf environments  

Science Conference Proceedings (OSTI)

Abstracts of workshop presentations concerning input, behavior, and fate of trace metals and radionuclides in the marine system are presented. (ACR)

Not Available

1980-03-01T23:59:59.000Z

409

Meeting Residential Ventilation Standards Through Dynamic Control...  

NLE Websites -- All DOE Office Websites (Extended Search)

Meeting Residential Ventilation Standards Through Dynamic Control of Ventilation Systems Title Meeting Residential Ventilation Standards Through Dynamic Control of Ventilation...

410

Emissions of trace gases and aerosols during the open combustion of biomass  

NLE Websites -- All DOE Office Websites (Extended Search)

Emissions of trace gases and aerosols during the open combustion of biomass Emissions of trace gases and aerosols during the open combustion of biomass in the laboratory Title Emissions of trace gases and aerosols during the open combustion of biomass in the laboratory Publication Type Journal Article Year of Publication 2009 Authors McMeeking, Gavin R., Sonia M. Kreidenweis, Stephen Baker, Christian M. Carrico, Judith C. Chow, Jeffrey Collett L. Jr., Wei Min Hao, Amanda S. Holden, Thomas W. Kirchstetter, William C. Malm, Hans Moosmuller, Amy P. Sullivan, and Cyle E. Wold Journal Journal of Geophysical Research Volume 114 Abstract We characterized the gas- and speciated aerosol-phase emissions from the open combustion of 33 different plant species during a series of 255 controlled laboratory burns during the Fire Laboratory at Missoula Experiments (FLAME). The plant species we tested were chosen to improve the existing database for U.S. domestic fuels: laboratory-based emission factors have not previously been reported for many commonly burned species that are frequently consumed by fires near populated regions and protected scenic areas. The plants we tested included the chaparral species chamise, manzanita, and ceanothus, and species common to the southeastern United States (common reed, hickory, kudzu, needlegrass rush, rhododendron, cord grass, sawgrass, titi, and wax myrtle). Fire-integrated emission factors for gas-phase CO2, CO, CH4, C2-4 hydrocarbons, NH3, SO2, NO, NO2, HNO3, and particle-phase organic carbon (OC), elemental carbon (EC), SO4 2, NO3, Cl, Na+, K+, and NH4 + generally varied with both fuel type and with the fire-integrated modified combustion efficiency (MCE), a measure of the relative importance of flaming- and smoldering-phase combustion to the total emissions during the burn. Chaparral fuels tended to emit less particulate OC per unit mass of dry fuel than did other fuel types, whereas southeastern species had some of the largest observed emission factors for total fine particulate matter. Our measurements spanned a larger range of MCE than prior studies, and thus help to improve estimates of the variation of emissions with combustion conditions for individual fuels.

411

Conversion of the trace elements Zn, Cd, and Pb in the combustion of near-Moscow coals  

SciTech Connect

A model for the conversion of trace elements in the combustion of near-Moscow coals based on a complex approach combining the capabilities of geochemistry, chemical thermodynamics, phase analysis, and chemical kinetics is proposed. The conversion of the trace elements Zn, Cd, and Pb as the constituents of near-Moscow coal in the flow of coal combustion products along the line of the P-59 boiler at the Ryazanskaya Thermal Power Plant was calculated. Experimental data were used in the development of the model and in calculations.

E.V. Samuilov; L.N. Lebedeva; L.S. Pokrovskaya; M.V. Faminskaya [OAO Power Engineering Institute, Moscow (Russia)

2008-10-15T23:59:59.000Z

412

Investigation of exposure rates and radionuclide and trace metal distributions along the Hanford Reach of the Columbia River  

SciTech Connect

Studies have been conducted to investigate exposure rates, and radionuclide and trace metal distributions along the Columbia River where it borders the Hanford Site. The last major field study was conducted in 1979. With recently renewed interest in various land use and resource protection alternatives, it is important to have data that represent current conditions. Radionuclides and trace metals were surveyed in Columbia River shoreline soils along the Hanford Site (Hanford Reach). The work was conducted as part of the Surface Environmental Surveillance Project, Pacific Northwest Laboratory. The survey consisted of taking exposure rate measurements and soil samples primarily at locations known or expected to have elevated exposure rates.

Cooper, A.T.; Woodruff, R.K.

1993-09-01T23:59:59.000Z

413

Dynamics and constraints of the unified dark matter flat cosmologies  

SciTech Connect

We study the dynamics of the scalar field Friedmann-Lemaitre-Robertson-Walker flat cosmological models within the framework of the unified dark matter (UDM) scenario. In this model we find that the main cosmological functions such as the scale factor of the Universe, the scalar field, the Hubble flow, and the equation of state parameter are defined in terms of hyperbolic functions. These analytical solutions can accommodate an accelerated expansion, equivalent to either the dark energy or the standard {lambda} models. Performing a joint likelihood analysis of the recent supernovae type Ia data and the baryonic acoustic oscillations traced by the Sloan Digital Sky Survey galaxies, we place tight constraints on the main cosmological parameters of the UDM cosmological scenario. Finally, we compare the UDM scenario with various dark energy models namely {lambda} cosmology, parametric dark energy model and variable Chaplygin gas. We find that the UDM scalar field model provides a large and small scale dynamics which are in fair agreement with the predictions by the above dark energy models although there are some differences especially at high redshifts.

Basilakos, Spyros [Academy of Athens, Research Center for Astronomy and Applied Mathematics, Soranou Efesiou 4, GR-11527, Athens (Greece); Lukes-Gerakopoulos, Georgios [Academy of Athens, Research Center for Astronomy and Applied Mathematics, Soranou Efesiou 4, GR-11527, Athens (Greece); University of Athens, Department of Physics, Section of Astrophysics, Astronomy and Mechanics (Greece)

2008-10-15T23:59:59.000Z

414

Anaerobic Digestion of Algal Biomass Residues with Nutrient Recycle Microalgae are currently considered as a renewable source of liquid and gaseous biofuels and  

E-Print Network (OSTI)

#12;1 Anaerobic Digestion of Algal Biomass Residues with Nutrient Recycle Background Microalgae a lower- value use and simpler processing approach representative of anaerobic digestion (AD) (Sialve et-in replacements of gasoline, diesel, and jet fuel (Jones & Mayfield, 2012; Regalbuto, 2009), and anaerobically

Collins, Gary S.

415

The dynamics of internal gravity waves in the ocean: theory and applications  

E-Print Network (OSTI)

In this paper we consider fundamental processes of the disturbance and propagation of internal gravity waves in the ocean modeled as a vertically stratified, horizontally non-uniform, and non-stationary medium. We develop asymptotic methods for describing the wave dynamics by generalizing the spatiotemporal ray-tracing method (a geometrical optics method). We present analytical and numerical algorithms for calculating the internal gravity wave fields using actual ocean parameters such as physical characteristics of the sea water, topography of its floor, etc. We demonstrate that our mathematical models can realistically describe the internal gravity wave dynamics in the ocean. Our numerical and analytical results show that the internal gravity waves have a significant impact on underwater objects in the ocean.

Bulatov, Vitaly V

2013-01-01T23:59:59.000Z

416

The dynamics of internal gravity waves in the ocean: theory and applications  

E-Print Network (OSTI)

In this paper we consider fundamental processes of the disturbance and propagation of internal gravity waves in the ocean modeled as a vertically stratified, horizontally non-uniform, and non-stationary medium. We develop asymptotic methods for describing the wave dynamics by generalizing the spatiotemporal ray-tracing method (a geometrical optics method). We present analytical and numerical algorithms for calculating the internal gravity wave fields using actual ocean parameters such as physical characteristics of the sea water, topography of its floor, etc. We demonstrate that our mathematical models can realistically describe the internal gravity wave dynamics in the ocean. Our numerical and analytical results show that the internal gravity waves have a significant impact on underwater objects in the ocean.

Vitaly V. Bulatov; Yuriy V. Vladimirov

2013-08-16T23:59:59.000Z

417

Definition: Dynamic Interchange Schedule Or Dynamic Schedule | Open Energy  

Open Energy Info (EERE)

Schedule Or Dynamic Schedule Schedule Or Dynamic Schedule Jump to: navigation, search Dictionary.png Dynamic Interchange Schedule Or Dynamic Schedule A telemetered reading or value that is updated in real time and used as a schedule in the AGC/ACE equation and the integrated value of which is treated as a schedule for interchange accounting purposes. Commonly used for scheduling jointly owned generation to or from another Balancing Authority Area.[1] Related Terms balancing authority, balancing authority area, smart grid References ↑ Glossary of Terms Used in Reliability Standards An in LikeLike UnlikeLike You like this.Sign Up to see what your friends like. line Glossary Definition Retrieved from "http://en.openei.org/w/index.php?title=Definition:Dynamic_Interchange_Schedule_Or_Dynamic_Schedule&oldid=502492

418

Trace gases, CO/sub 2/, climate, and the greenhouse effect  

SciTech Connect

Weather is driven by the sun's energy input and the difference between insolation per unit area of the poles and the equator. The energy flux of the Earth is in long-term balance: as much is radiated away by the Earth as is absorbed, or the mean temperature would have to increase or decrease steadily (and, of course, this is not observed). CO/sub 2/ and other ''trace gases'' can cause the Earth's mean temperature to rise through the Greenhouse Effect. The mean temperature in the Little Ice Age was only 1 /sup 0/C cooler, but large effects were felt, especially toward the poles. The CO/sub 2/ which stays in the atmosphere will raise Earth's mean temperature, with effects which are relatively certain: a lot of warming at the poles, and a very small amount of warming at the equator.

Aubrecht G.J. II

1988-03-01T23:59:59.000Z

419

COLLOQUIUM: On Tracing the Origins of the Solar Wind | Princeton Plasma  

NLE Websites -- All DOE Office Websites (Extended Search)

January 8, 2014, 4:00pm to 5:30pm January 8, 2014, 4:00pm to 5:30pm Colloquia MBG Auditorium COLLOQUIUM: On Tracing the Origins of the Solar Wind Dr. Sarah McGregor Boston University The Sun emits a constant flow of particles from its surface. Mainly composed of Protons and electrons, and dragging with it magnetic fields, this Solar Wind expands outwards from the sun, interacting with planets and spacecraft alike. Since the 1960s, in situ observations have shown that the solar wind is comprised of two distinct states: slow (300550 km/s) and fast (600800 km/s). Temperature, density, and compositional variations between the two suggest different sources for the fast and slow solar wind. Using state of the art models and observations I find that the solar wind observations used to distinguish between fast and slow solar wind are not

420

Building Technologies Program: Tax Deduction Qualified Software - TRACE 700 version 6.1.2  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

2 2 On this page you'll find information about the TRACE 700 version 6.1.2 qualified computer software (www.buildings.energy.gov/qualified_software.html), which calculates energy and power cost savings that meet federal tax incentive requirements for commercial buildings (www.buildings.energy.gov/commercial/). Date Documentation Received by DOE: 9 November 2007 Statements in quotes are from the software developer. Internal Revenue Code §179D (c)(1) and (d) Regulations Notice 2006-52, Section 6 requirements (1) The name, address, and (if applicable) web site of the software developer; TRANE, A Division of American Standard 3600 Pammel Creek Road LaCrosse, Wisconsin 54601 www.tranecds.com (2) The name, email address, and telephone number of the person to contact for further

Note: This page contains sample records for the topic "nutrient dynamics trace" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Double-Trace Deformations, Mixed Boundary Conditions and Functional Determinants in AdS/CFT  

E-Print Network (OSTI)

According to the AdS/CFT dictionary, perturbing the large N boundary theory by a relevant double-trace deformation of the form f O^2 corresponds in the bulk to imposing ``mixed'' boundary conditions for the field dual to O. In this note we address various aspects of this correspondence. The change c_{UV} - c_{IR} of the central charge between the UV ad IR fixed points is known from explicit calculations (hep-th/0210093, hep-th/0212138) to be exactly the same in the bulk and in the boundary theories. By comparing the appropriate bulk and boundary functional determinants, we give a simple ``kinematic'' explanation for this universal agreement. We also clarify the prescription for computing AdS/CFT correlators with Delta_- boundary conditions.

Hartman, T; Hartman, Thomas; Rastelli, Leonardo

2008-01-01T23:59:59.000Z

422

Double-Trace Deformations, Mixed Boundary Conditions and Functional Determinants in AdS/CFT  

E-Print Network (OSTI)

According to the AdS/CFT dictionary, perturbing the large N boundary theory by a relevant double-trace deformation of the form f O^2 corresponds in the bulk to imposing ``mixed'' boundary conditions for the field dual to O. In this note we address various aspects of this correspondence. The change c_{UV} - c_{IR} of the central charge between the UV ad IR fixed points is known from explicit calculations (hep-th/0210093, hep-th/0212138) to be exactly the same in the bulk and in the boundary theories. By comparing the appropriate bulk and boundary functional determinants, we give a simple ``kinematic'' explanation for this universal agreement. We also clarify the prescription for computing AdS/CFT correlators with Delta_- boundary conditions.

Thomas Hartman; Leonardo Rastelli

2006-02-10T23:59:59.000Z

423

An Approach to Evaluate Scientist Support in Abstract Workflows and Provenance Traces  

Science Conference Proceedings (OSTI)

Abstract workflows are useful to bridge the gap between scientists and technologists towards using computer systems to carry out scientific processes. Provenance traces provide evidence required to validate results and support their reuse. Assuming both technologies are based on formal semantics, a knowledge-based system that consistently merges both technologies is useful for scientists that produce data to document their data collecting and transformation processes; it is also useful for scientists that reuse data to assess scientific processes and resulting datasets produced by others. While evaluation of each technology is necessary for a given application, this work discusses their combined evaluation. The claim is that both technologies should complement each other and align consistently to a scientist’s perspective in order to be effective for science. Evaluation criteria are proposed based on lessons learned and exemplified for discussion.

Salayandia, Leonardo; Gates, Ann Q.; Pinheiro da Silva, Paulo

2012-11-02T23:59:59.000Z

424

Improved measurement accuracy in a Long Trace Profiler: Compensation for laser pointing instability  

SciTech Connect

Laser pointing instability adds to the error of slope measurements taken with the Long Trace Profiler (LTP). As with carriage pitch error, this laser pointing error must be accounted for and subtracted from the surface under test (SUT) slope measurement. In the past, a separate reference beam (REF) allowed characterization of the component of slope error from carriage pitch. However, the component of slope error from laser pointing manifests itself differently in the SUT measured slope. An analysis of angle error propagation is given, and the effect of these errors on measured slope is determined. Then a method is proposed for identifying these errors and subtracting them from the measured SUT slope function. Separate measurements of carriage pitch and laser pointing instability isolate these effects, so that the effectiveness of the error identification algorithm may be demonstrated.

Irick, S.C.

1993-08-02T23:59:59.000Z

425

Effects of coal-derived trace species on the performance of molten carbonate fuel cells  

DOE Green Energy (OSTI)

The overall objective of the present study was to determine in detail the interaction effects of 10 simultaneously present, coal-gas contaminants, both on each other and on components of the Carbonate Fuel Cell. The primary goal was to assess underlying chemistries and reaction mechanisms which may cause decay in fuel cell performance or endurance as a result of both physics-chemical and/or mechanical interactions with the cell components and internal fuel cell parts. It was found, both from theory and cell test evidence, that trace contaminant interactions may occur with: Fuel-cell Electrodes (e.g., in this study with the Ni-anode), Lithium/Potassium Carbonate Electrolyte, Nickel and SS-Hardware, and by Mechanical Obstruction of Gas Flow in the Anode Plenum.

Pigeaud, A.

1991-10-01T23:59:59.000Z

426

Problems of trace-element ratios and geothermometry in a gravel geothermal-aquifer system  

DOE Green Energy (OSTI)

The system studied is a Tertiary-age, block-faulted basin in which a Pleistocene gravel bed acts as a confined aquifer and permits the lateral dispersion of the geothermal fluids. Vertical movement of the hot water is currently believed to be controlled by faults on the east side of the valley. An aerial magnetic anomaly and a Bouguer gravity anomaly appear to correspond with thoese eastern faults. Basic data on the geology and trace element halos has been presented previously. Evaluation of the mixing phenomena in this system was attempted using a dissolved silica-enthalpy graph. A chalcedony curve is also plotted. An enthalpy versus chloride plot, suggests that either conductive cooling occurs before mixing or that higher chloride content background waters are available for mixing. (MHR)

Sonderegger, J.L.; Donovan, J.J.

1982-01-01T23:59:59.000Z

427

COMPACT QEPAS SENSOR FOR TRACE METHANE AND AMMONIA DETECTION IN IMPURE HYDROGEN  

DOE Green Energy (OSTI)

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.

Wright, J; Ferguson, B; Peters, B; Mcwhorter, S

2011-11-02T23:59:59.000Z

428

Building Technologies Program: Tax Deduction Qualified Software - TRACE 700 version 6.1.0.0  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

0.0 0.0 On this page you'll find information about the TRACE 700 version 6.1.0.0 qualified computer software (www.buildings.energy.gov/qualified_software.html), which calculates energy and power cost savings that meet federal tax incentive requirements for commercial buildings (www.buildings.energy.gov/commercial/). Date Documentation Received by DOE: 18 December 2006 Statements in quotes are from the software developer. Internal Revenue Code §179D (c)(1) and (d) Regulations Notice 2006-52, Section 6 requirements (1) The name, address, and (if applicable) web site of the software developer; TRANE, A Division of American Standard 3600 Pammel Creek Road LaCrosse, Wisconsin 54601 www.tranecds.com (2) The name, email address, and telephone number of the person to contact for further

429

Building Technologies Program: Tax Deduction Qualified Software - TRACE 700 version 6.1.1.0  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

1.0 1.0 On this page you'll find information about the TRACE 700 version 6.1.1.0 qualified computer software (www.buildings.energy.gov/qualified_software.html), which calculates energy and power cost savings that meet federal tax incentive requirements for commercial buildings (www.buildings.energy.gov/commercial/). Date Documentation Received by DOE: 26 June 2007 Statements in quotes are from the software developer. Internal Revenue Code §179D (c)(1) and (d) Regulations Notice 2006-52, Section 6 requirements (1) The name, address, and (if applicable) web site of the software developer; TRANE, A Division of American Standard 3600 Pammel Creek Road LaCrosse, Wisconsin 54601 www.tranecds.com (2) The name, email address, and telephone number of the person to

430

Heat transfer dynamics  

Science Conference Proceedings (OSTI)

As heat transfer technology increases in complexity, it becomes more difficult for those without thermal dynamics engineering training to choose between competitive heat transfer systems offered to meet their drying requirements. A step back to the basics of heat transfer can help professional managers and papermakers make informed decisions on alternative equipment and methods. The primary forms of heat and mass transfer are reviewed with emphasis on the basics, so a practical understanding of each is gained. Finally, the principles and benefits of generating infrared energy by combusting a gaseous hydrocarbon fuel are explained.

Smith, T.M. (Marsden, Inc., Pennsauken, NJ (United States))

1994-08-01T23:59:59.000Z

431

Zero-order trace element distribution model for the Great Plains Coal Gasification Plant: Topical report  

SciTech Connect

The Morgantown Energy Technology Center of the US DOE is developing a series for models of environmental systems. Both zero-order and detailed models are being developed. Detailed models are based on fundamental engineering principles and the use of detailed physical and chemical property data; reliance on empirical relationships and correlations is minimized. The key advantage of detailed models is their predictive capabilities and utility in performing valid comparative analyses. An important prerequisite to the development of detailed models in the availability of representative, long-term process and environmental data. These data are needed both to develop the models as well as to validate them. Zero-order models are less rigorous and have less predictive capability than detailed models since they are based on empirical estimates and simple correlations. However, they can be developed relatively quickly and are significantly less expensive to develop and use compared to detailed models. Zero-order models are useful in identifying potential environmental or control technology problems. As such, they can help direct future research and development efforts. They can provide useful information when comprehensive data are unavailable for detailed modeling, and can be used as a screening tool to identify process alternatives which appear to warrant more detailed modeling. This report describes a zero-order trace element distribution model for the Great Plains Coal Gasification Plant located near Beulah, North Dakota. The model estimates how trace elements entering the plant in the feed coal are distributed to the plant's process and waste streams. Elements that may be introduced to the plant's waste streams from sorbents and/or catalysts (e.g., Vanadium in makeup Stretford solution) are not considered in the model. 13 refs.

Thomas, W.C.; Page, G.C.; Magee, R.A.

1987-04-01T23:59:59.000Z

432

Biological processes for concentrating trace elements from uranium mine waters. Technical completion report  

Science Conference Proceedings (OSTI)

Waste water from uranium mines in the Ambrosia Lake district near Grants, New Mexico, USA, contains uranium, selenium, radium and molybdenum. The Kerr-McGee Corporation has a novel treatment process for waters from two mines to reduce the concentrations of the trace contaminants. Particulates are settled by ponding, and the waters are passed through an ion exchange resin to remove uranium; barium chloride is added to precipitate sulfate and radium from the mine waters. The mine waters are subsequently passed through three consecutive algae ponds prior to discharge. Water, sediment and biological samples were collected over a 4-year period and analyzed to assess the role of biological agents in removal of inorganic trace contaminants from the mine waters. Some of the conclusions derived from this study are: (1) The concentrations of soluble uranium, selenium and molybdenum were not diminished in the mine waters by passage through the series of impoundments which constituted the mine water treatment facility. Uranium concentrations were reduced but this was due to passage of the water through an ion exchange column. (2) The particulate concentrations of the mine water were reduced at least ten-fold by passage of the waters through the impoundments. (3) The sediments were anoxic and enriched in uranium, molybdenum and selenium. The deposition of particulates and the formation of insoluble compounds were proposed as mechanisms for sediment enrichment. (4) The predominant algae of the treatment ponds were the filamentous Spirogyra and Oscillatoria, and the benthic alga, Chara. (5) Adsorptive processes resulted in the accumulation of metals in the algae cells. (6) Stimulation of sulfate reduction by the bacteria resulted in retention of molybdenum, selenium, and uranium in sediments. 1 figure, 16 tables.

Brierley, C.L.; Brierley, J.A.

1981-12-01T23:59:59.000Z

433

Sub-microradian Surface Slope Metrology with the ALS Developmental Long Trace Profiler  

Science Conference Proceedings (OSTI)

Development of X-ray optics for 3rd and 4th generation X-ray light sources with a level of surface slope precision of 0.1-0.2 {micro}rad requires the development of adequate fabrication technologies and dedicated metrology instrumentation and methods. Currently, the best performance of surface slope measurement has been achieved with the NOM (Nanometer Optical Component Measuring Machine) slope profiler at BESSY (Germany) [1] and the ESAD (Extended Shear Angle Difference) profiler at the PTB (Germany) [2]. Both instruments are based on electronic autocollimators (AC) precisely calibrated for the specific application [3] with small apertures of 2.5-5 mm in diameter. In the present work, we describe the design, initial alignment and calibration procedures, the instrumental control and data acquisition system, as well as the measurement performance of the Developmental Long Trace Profiler (DLTP) slope measuring instrument recently brought into operation at the Advanced Light Source (ALS) Optical Metrology Laboratory (OML). Similar to the NOM and ESAD, the DLTP is based on a precisely calibrated autocollimator. However, this is a reasonably low budget instrument used at the ALS OML for the development and testing of new measuring techniques and methods. Some of the developed methods have been implemented into the ALS LTP-II (slope measuring long trace profiler [4]) which was recently upgraded and has demonstrated a capability for 0.25 {micro}rad surface metrology [5]. Performance of the DLTP was verified via a number of measurements with high quality reference mirrors. A comparison with the corresponding results obtained with the world's best slope measuring instrument, the BESSY NOM, proves the accuracy of the DLTP measurements on the level of 0.1-0.2 {micro}rad depending on the curvature of a surface under test. The directions of future work to develop a surface slope measuring profiler with nano-radian performance are also discussed.

Yashchuk, Valeriy V.; Barber, Samuel; Domning, Edward E.; Kirschman, Jonathan L.; Morrison, Gregory Y.; Smith, Brian V.; Siewert, Frank; Zeschke, Thomas; Geckeler, Ralf; Just, Andreas

2009-06-15T23:59:59.000Z

434

The application of a synchrotron radiation microprobe to trace element analysis  

SciTech Connect

Synchrotron radiation is light emitted by electrons when accelerated in a circular orbit. Properties of synchrotron radiation important to trace element analysis by x-ray fluorescence analysis include a broad, continuous and tunable energy spectrum for K- and L-shell excitation of all elements; a linearly polarized source reducing the scattered radiation backgrounds; low energy deposition in the target; and an appreciable flux in narrow energy bandwidths for chemical speciation. Experiments to date have generally used ''white'' continuous spectra with a low energy absorber and no focussing, but future runs will use focussing mirrors which increase intensities by a factor of more than 1000. Monochromators will be used to select the energy and bandwidths appropriate to the experiment. Detection limits for thin biomedical samples using a solid-state detector, a 0.5 mm beam and a 5 min counting interval were in the range of 30 ppB for calcium to 50 ppB for zinc. A prototype wet cell was designed, constructed and tested using cat cardiac myocytes with the result that major trace elements such as iron could be quantitated in single myocytes. The x-ray microprobe was used to localize gallium in fetal rat bone explants after being cultured in BGJ media containing 25 ..mu..M Ga(NO/sub 3/)/sub 3/. The high brightness of x rays from a synchrotron source makes possible the development of computerized tomography on a micrometer scale. A tomogram of a freeze-dried caterpillar head was produced in a 50 min scan. The pixel size was 30 ..mu..m using a 20-..mu..m beam. 2 refs., 1 fig.

Gordon, B.M.; Hanson, A.L.; Jones, K.W.; Kwiatek, W.M.; Long, G.J.; Pounds, J.G.; Schidlovsky, G.; Spanne, P.; Rivers, M.L.; Sutton, S.R.

1987-01-01T23:59:59.000Z

435

Marine microbial intact polar diacylglycerolipids and their application in the study of nutrient stress and bacterial production  

E-Print Network (OSTI)

Intact polar diacylglycerolipids (IP-DAGs) were used to study microbial dynamics in the surface ocean. IP-DAGs from surface ocean seawater were quantified using high performance liquid chromatography-mass spectrometry ...

Popendorf, Kimberly J. (Kimberly Julia)

2013-01-01T23:59:59.000Z

436

Dynamic Chirality in Nuclei  

SciTech Connect

The possible chiral interpretation of twin bands in odd-odd nuclei was investigated in the Interacting Boson Fermion-Fermion Model. The analysis of the wave functions has shown that the possibility for angular momenta of the valence proton, neutron and core to find themselves in the favorable, almost orthogonal geometry is present, but not dominant. Such behaviour is found to be similar in nuclei where both the level energies and the electromagnetic decay properties display the chiral pattern, as well as in those where only the energies of the corresponding levels in the twin bands are close together. The difference in the structure of the two types of chiral candidates nuclei can be attributed to different beta and gamma fluctuations, induced by the exchange boson-fermion interaction of the Interacting Boson Fermion-Fermion Model. In both cases the chirality is weak and dynamic. The existence of doublets of bands in {sup 134}Pr can be attributed to dynamic chirality dominated by shape fluctuations.

Tonev, D. [Institute for Nuclear Research and Nuclear Energy, BAS, 1784 Sofia (Bulgaria); INFN, Laboratori Nazionali di Legnaro, 35020 Legnaro (Italy); Angelis, G. de [INFN, Laboratori Nazionali di Legnaro, 35020 Legnaro (Italy); Brant, S. [Department of Physics, Faculty of Science, University of Zagreb, 10000 Zagreb (Croatia); Petkov, P. [Institute for Nuclear Research and Nuclear Energy, BAS, 1784 Sofia (Bulgaria); Ventura, A. [ENEA, 40129 Bologna and INFN, Sezione di Bologna (Italy)

2009-08-26T23:59:59.000Z

437

Gas-Phase Molecular Dynamics  

NLE Websites -- All DOE Office Websites (Extended Search)

Gas-Phase Molecular Dynamics Gas-Phase Molecular Dynamics The Gas-Phase Molecular Dynamics Group is dedicated to developing and applying spectroscopic and theoretical tools to challenging problems in chemical physics related to reactivity, structure, dynamics and kinetics of transient species. Recent theoretical work has included advances in exact variational solution of vibrational quantum dynamics, suitable for up to five atoms in systems where large amplitude motion or multiple strongly coupled modes make simpler approximations inadequate. Other theoretical work, illustrated below, applied direct dynamics, quantum force trajectory calculations to investigate a series of reactions of the HOCO radical. The potential energy surface for the OH + CO/ H + CO2 reaction, showing two barriers (TS1 and TS2) and the deep HOCO well along the minimum energy pathway. The inset figure shows the experimental and calculated reactivity of HOCO with selected collision partners. See J.S. Francisco, J.T. Muckerman and H.-G. Yu, "HOCO radical chemistry,"

438

Fungal, bacterial, and archaeal communities mediating C cycling and trace gas flux in peatland ecosystems subject to climate change  

E-Print Network (OSTI)

Fungal, bacterial, and archaeal communities mediating C cycling and trace gas flux in peatland microbial community profiling in a network of natural peatland ecosystems spanning large-scale climate the drivers of microbial community composition via metagenomic and metatranscriptomic analysis of samples from

439

Accumulation of trace elements and growth responses in Corbicula fluminea downstream of a coal-fired power plant  

E-Print Network (OSTI)

Accumulation of trace elements and growth responses in Corbicula fluminea downstream of a coal 2009 Keywords: Corbicula fluminea Coal-fired power plant Selenium Mercury Glutathione Condition index Bioaccumulation a b s t r a c t Lentic organisms exposed to coal-fired power plant (CFPP) discharges can have

Hopkins, William A.

440

An Evaluation of Calibration Techniques for In Situ Carbon Dioxide Measurements Using a Programmable Portable Trace-Gas Measuring System  

Science Conference Proceedings (OSTI)

The construction and deployment of a portable trace-gas measurement system (TGaMS) is described. The air-collection system (dubbed HYDRA) collects air samples from 18 different locations and was connected to either one or two LI-COR LI-7000 gas ...

Sean P. Burns; Anthony C. Delany; Jielun Sun; Britton B. Stephens; Steven P. Oncley; Gordon D. Maclean; Steven R. Semmer; Joel Schröter; Johannes Ruppert

2009-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "nutrient dynamics trace" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Carbon dioxide Information Analysis Center and World Data Center: A for Atmospheric trace gases. Annual progress report, FY 1994  

SciTech Connect

This report summarizes the activities and accomplishments made by the Carbon Dioxide Information Analysis Center and World Data Center-A for Atmospheric Trace Gases during the fiscal year 1994. Topics discussed in this report include; organization and staff, user services, systems, communications, Collaborative efforts with China, networking, ocean data and activities of the World Data Center-A.

Burtis, M.D. [comp.] [Tennessee Univ., Knoxville, TN (United States). Energy, Environment and Resources Center; Cushman, R.M.; Boden, T.A.; Jones, S.B.; Nelson, T.R.; Stoss, F.W. [Oak Ridge National Lab., TN (United States)

1995-03-01T23:59:59.000Z

442

www.elsevier.com/locate/fuel Trace elements in coal derived liquids: analysis by ICP-MS and  

E-Print Network (OSTI)

Concentrations of trace elements in coal derived liquids have been investigated by inductively coupled plasma-mass spectrometry (ICP-MS) and by Mössbauer spectroscopy. Liquefaction extracts prepared from the Argonne Premium Coals and a coal tar pitch have been examined. Microwave digestion in concentrated nitric acid has been shown as a suitable method for determining trace element concentrations in coal derived liquids by ICP-MS—for sample sizes as small as 3–20 mg. High concentrations of Fe were found for all extract samples (?265–1474 ppm). Ti, Cr, Mn, Co, Ga, Sb, Cs and Ba were measurable. Concentration distributions of trace elements found in the extracts bore little relation to the corresponding distributions in the original coals. The proportions of individual trace elements present in the original coals and found in the extracts, varied widely. Mössbauer spectroscopy of the extracts indicated that the high Fe-concentrations corresponded to the presence of organometallic-Fe compounds—and not to pyritic iron. There is evidence suggesting the presence of material derived from iron-storage proteins such as ferritin, but final proof is lacking. Our data suggest that other metallic ions detected in these coal derived liquids may be present in association with the organic material. Concentrations of paramagnetic metal species were found to be of the same order of magnitude as ESR spin-densities already found in coal liquids. Both types of paramagnetic species are suspected of causing loss of signal in

Mössbauer Spectroscopy; R. Richaud A; H. Lachas A; M. -j. Lazaro A; L. J. Clarke B; K. E. Jarvis B; A. A. Herod A; T. C. Gibb C; R. Kandiyoti A

1999-01-01T23:59:59.000Z

443

Concentrations and Origins of Atmospheric Lead and Other Trace Species at a Rural Site in Northern China  

E-Print Network (OSTI)

grade HNO3 (6 mL) and HCl (2 mL) for 40 min, using a microwave sample digestion system (PerkinElmer Life factor of 2 is applied to the Al concentration. An inductively coupled plasma mass spectrometer (ICP), The fate of trace elements during coal combustion and gasification: an overview, Fuel, 72, 731-736. Díaz

Dickerson, Russell R.

444

High precision trace element and organic constituent analysis of oil shale and solvent-refined coal materials  

DOE Green Energy (OSTI)

The application of a number of sensitive and precise methods for the determination of trace elements, heavy element species and organic compounds in materials from an oil shale research retort process and from a solvent-refined coal pilot plant operation are discussed. The methods were chosen both for their sensitivity, and also for their relative freedom from interference effects. Coal liquids contain much higher concentrations of aromatic compounds, including polynuclear aromatic hydrocarbons (PNA's). A larger relative fraction of the pna's in shale oil are alkyl substituted. Coal liquids are also considerably higher in phenols (28 percent) than is shale oil (2 percent). N-heterocyclics are present in higher concentration (greater than 8 percent) in shale oil due to the high nitrogen content of the raw shale. Hydroaromatics are common in coal liquids but negligible in shale oil. Inorganic elements and speciation measurements indicate significant amounts of the toxic heavy elements Hg, As, Zn, and Se in effluent oil water and gas streams. In addition, the process water contains significant Co, Br, Sb, and U. Raw oil shale is highly enriched in Se, As and Sb and somewhat enriched in U, Pb, Cs, Hg and Zn. Solvent-refined coal liquids were found to be relatively low in most trace elements. The majority of trace elements are concentrated by the process into the mineral residue. Only Br and Hg are not depleted in solvent-refined coal. Other trace elements still remaining in significant amounts are U, Ta, Cr, and Zn.

Fruchter, J.S.; Petersen, M.R.; Laul, J.C.; Ryan, P.W.

1976-11-01T23:59:59.000Z

445

A General, Cryogenically-Based Analytical Technique for the Determination of Trace Quantities of Volatile Organic Compounds in the Atmosphere  

Science Conference Proceedings (OSTI)

An analytical technique for the determination of trace (sub-ppbv) quantities of volatile organic compounds in air was developed. A liquid nitrogen-cooled trap operated at reduced pressures in series with a Dupont Nafion-based drying tube and a ...

Randolph A. Coleman; Wesley R. Cofer III; Robert A. Edahl Jr.

1985-09-01T23:59:59.000Z

446

Emission Factors Handbook Addendum 2: Guidelines for Estimating Trace Substance Emissions from Fossil Fuel Steam Electric Power Plan ts  

Science Conference Proceedings (OSTI)

This handbook provides a tool for estimating trace substances emissions from fossil-fuel-fired power plants. The suggested emission factors are based on EPRI and U.S. Department of Energy (DOE) field measurements conducted at 51 power plants using generally consistent sampling and analytical protocols. This information will help utility personnel estimate air toxic emissions for permitting purposes.

2000-12-22T23:59:59.000Z

447

Global trace asymptotics in the self-generated magnetic field in the case of Coulomb-like singularities  

E-Print Network (OSTI)

We consider a semiclassical asymptotics of local trace for the 3D-Schroedinger operator with self-generated magnetic field in the case when electric potential has one or several Coulomb-like singularities; it is given by Weyl expression plus (magnetic) Scott correction term with O(h^{-4/3}) error provided distance between singularities is large enough.

Ivrii, Victor

2011-01-01T23:59:59.000Z

448

Particle Dynamics And Emergent Gravity  

E-Print Network (OSTI)

The emergent gravity proposal is examined within the framework of noncommutative QED/gravity correspondence from particle dynamics point of view.

Amir H. Fatollahi

2008-05-08T23:59:59.000Z

449

Nuclear Matter and Nuclear Dynamics  

E-Print Network (OSTI)

Highlights on the recent research activity, carried out by the Italian Community involved in the "Nuclear Matter and Nuclear Dynamics" field, will be presented.

M Colonna

2009-02-26T23:59:59.000Z

450

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

E-Print Network (OSTI)

Land application of large, volume-based rates of municipal biosolids (MB) enhances soil physical properties and provides an alternative to disposal in landfills. Yet, topdressing or incorporation of the volume-based rates can increase non-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 was to compare the production of Tifway bermudagrass sod between fields grown with and without MB under increasing rates of supplemental fertilizer N. The second objective was to compare runoff losses between soils constructed with and without MB before planting to sprigs or sod transplanted from turfgrass grown in soil with and without incorporation of MB. Incorporation of 25% by volume of MB in soil enhanced (p < 0.001) turfgrass coverage of the soil surface compared to soil without MB. In addition, amending soil with MB reduced wet and dry sod weights (p < 0.001) and increased soil water content (p < 0.001) at harvest compared to sod without MB. Runoff concentrations and mass loss of total dissolved P (TDP) were significantly greater (P=0.001) for MB-amended compared to un-amended sod. In addition, a linear relationship (R2 = 0.94) was observed between water extractable soil P within the 0- to 2-cm depth and concentrations and mass loss of TDP in runoff. Similarly, runoff loss of NO3-N was greater (P = 0.05) for soil mixed with 25% by volume of MB than soil alone and variation of NO3-N loss among treatments was directly related to soil NO3-N concentration within the 0- to 5-cm depth. In contrast, runoff concentrations of NH4-N were directly related to inputs of N from turf clippings returned to soil rather than soil NH4-N concentrations. Total Kjeldahl N (TKN) concentration in runoff was unrelated to soil N concentrations, but was linearly related to mass loss of sediment in runoff. Transplanted sod reduced sediment loss compared to sprigged soil during turfgrass establishment and MB-amended soil reduced sediment loss compared to soil without MB. In addition, the MB imported in sod or incorporated in soil before sprigging increased soil organic carbon and mean soil water content compared to sod or soil without MB over a 92 day period. Incorporation of MB within soil prior to planting fertilizer grown turfgrass sod enhanced water conservation and reduced nutrient loss compared to planting MB-grown sod on un-amended soils.

Schnell, Ronnie Wayne

2007-05-01T23:59:59.000Z

451

and Industry Dynamics  

E-Print Network (OSTI)

We assess the long-run dynamic implications of market-based regulation of carbon dioxide emissions in the US Portland cement industry. We consider several alternative policy designs, including mechanisms that use production subsidies to partially offset compliance costs and border tax adjustments to penalize emissions associated with foreign imports. Our results highlight two general countervailing market distortions. First, following Buchanan (1969), reductions in product market surplus and allocative inefficiencies due to market power in the domestic cement market counteract the social benefits of carbon abatement. Second, tradeexposure to unregulated foreign competitors leads to emissions “leakage ” which offsets domestic emissions reductions. Taken together, these forces result in social welfare losses under policy regimes that fully internalize the emissions externality. In contrast, market-based policies that incorporate design features to mitigate the exercise of market power and emissions leakage can deliver welfare gains. 1

Meredith Fowlie; Mar Reguant; Stephen P. Ryan; Meredith Fowlie; Mar Reguant; Stephen P. Ryan

2013-01-01T23:59:59.000Z

452

Dynamic Radiographic Imaging  

Science Conference Proceedings (OSTI)

A radiographic system recently developed by American and Russian collaborators is designed to capture multiple images of a dynamic event lasting less than 10 microseconds. Various optical and electro-optical components were considered and their performance compared. The final system employed a solid crystal of lutetium oxyorthosilicate doped with cerium (LSO:Ce or LSO) for X-ray-to-light conversion with a coherent fiber optic bundle to relay the scintillator image to a streak camera with charge coupled device (CCD) readout. Resolution and sensitivity studies were carried out for this system on two different sources of X-rays: a 20 MeV microtron and a 70 MeV betatron.

Volkov, A.; Turley, D.; Veeser, L.; Lukyanov, N.; Yegorov, N.; Baker, S.A.; Mirenko, V.; Lewis, W.; Kuropatkin, Y.

1999-06-01T23:59:59.000Z

453

The Origin of Temporal Variance in Long-Lived Trace Constituents in the Summer Stratosphere  

Science Conference Proceedings (OSTI)

Temporal variances in the concentrations of N2O, CF2Cl2, CFCl3 and CH4 in the summer stratosphere at a midlatitude location have been measured by Ehhalt and others. A simple dynamical model is used to argue that these variances are created by ...

Peter G. Hess; James R. Holton

1985-07-01T23:59:59.000Z

454

Dynamic Vnodes - design and implementation  

Science Conference Proceedings (OSTI)

Dynamic vnodes make the UNIX kernel responsive to a varying demand for vnodes, without a need to rebuild the kernel. It also optimizes the usage of memory by deallocating excess vnodes. This paper describes the design and implementation of dynamic vnodes ...

Aju John

1995-01-01T23:59:59.000Z

455

Dynamic model for hydraulic dissipators  

Science Conference Proceedings (OSTI)

The authors propose a mathematical model of a hydraulic link with energy dissipation, the device working reversibly to the alternative traction and compression movement. The dynamic behavior of the energy hydraulic dissipater depends on the instantaneous ... Keywords: dissipater's control, dynamic behavior, hydraulic dissipater, mathematical model

Adrian S. Axinti; Gavril Axinti

2009-03-01T23:59:59.000Z

456

Fluctuations in molecular dynamics simulations  

Science Conference Proceedings (OSTI)

Statistical fluctuations of a system about its equilibrium state, monitored in a molecular dynamics simulation, are an effective means of computing the thermodynamic and kinetic properties of interfaces in metals and alloys. In this work, three applications ... Keywords: Fluctuations, Grain boundaries, Interfaces, Interfacial free energy, Mobility, Molecular dynamics

J. J. Hoyt; Z. T. Trautt; M. Upmanyu

2010-03-01T23:59:59.000Z

457

Dynamic spectrum management using GA  

Science Conference Proceedings (OSTI)

Thousands of equipments of the wireless network and the mobile devices are widely used and the demand of dynamic spectrum resources is significantly growing. How to maximize the social utility in modern technique becomes an important issue. In this paper, ... Keywords: Shannon utility, background interference, crosstalk, dynamic spectrum management, genetic algorithm

Ping-Liang Chen; Chia-Liang Peng; Shin-Jia Chen; Yu-Cheng Lin

2011-12-01T23:59:59.000Z

458

Periodicity estimation of Dynamic Textures  

Science Conference Proceedings (OSTI)

Dynamic Textures (DTs) are image sequences of natural events like fire, smoke, water etc., that possesses regular motion patterns. Periodicity is a widely used tool to analyse regular structures of periodic one dimensional signals as well as two dimensional ... Keywords: co-occurrence matrix, dynamic textures, image sequences, image texture analysis, motion patterns, natural events, periodicity estimation, temporal textures

Khalid Zaman Bijon; Ahmed Hasan; Ashfaqur Rahman; Manzur Murshed

2008-03-01T23:59:59.000Z

459

Grating light reflection spectroelectrochemistry for detection of trace amounts of aromatic hydrocarbons in water  

SciTech Connect

Grating light reflection spectroscopy (GLRS) is an emerging technique for spectroscopic analysis and sensing. A transmission diffraction grating is placed in contact with the sample to be analyzed, and an incident light beam is directed onto the grating. At certain angles of incidence, some of the diffracted orders are transformed from traveling waves to evanescent waves. This occurs at a specific wavelength that is a function of the grating period and the complex index of refraction of the sample. The intensities of diffracted orders are also dependent on the sample's complex index of refraction. The authors describe the use of GLRS, in combination with electrochemical modulation of the grating, for the detection of trace amounts of aromatic hydrocarbons. The diffraction grating consisted of chromium lines on a fused silica substrate. The depth of the grating lines was 1 {micro}m, the grating period was 1 {micro}m, and the duty cycle was 50%. Since chromium was not suitable for electrochemical modulation of the analyte concentration, a 200 nm gold layer was deposited over the entire grating. This gold layer slightly degraded the transmission of the grating, but provided satisfactory optical transparency for the spectroelectrochemical experiments. The grating was configured as the working electrode in an electrochemical cell containing water plus trace amounts of the aromatic hydrocarbon analytes. The grating was then electrochemically modulated via cyclic voltammetry waveforms, and the normalized intensity of the zero order reflection was simultaneously measured. The authors discuss the lower limits of detection (LLD) for two analytes, 7-dimethylamino-1,2-benzophenoxazine (Meldola's Blue dye) and 2,4,6-trinitrotoluene (TNT), probed with an incident HeNe laser beam ({lambda} = 543.5 nm) at an incident angle of 52.5{degree}. The LLD for 7-dimethylamino-1,2-benzophenoxazine is approximately 50 parts per billion (ppb), while the LLD for TNT is approximately 50 parts per million (ppm). The possible factors contributing to the differences in LLD for these analytes are discussed. This is the final report for a Sandia National Laboratories Laboratory Directed Research and Development (LDRD) project conducted during fiscal years 1998 and 1999 (case number 3518.190).

KELLY,MICHAEL J.; SWEATT,WILLIAM C.; KEMME,SHANALYN A.; KASUNIC,K.J.; BLAIR,DIANNA S.; ZAIDI,S.H.; MCNEIL,J.R.; BURGESS,L.W.; BRODSKY,A.M.; SMITH,S.A.

2000-04-01T23:59:59.000Z

460

STRUCTURE AND DYNAMICS IN PHOTOSYSTEM I Craig Charles Jolley  

E-Print Network (OSTI)

the use of domestic wood for energy. The greater demand for forest biomass resulted in a trend toward more's of severe nutrient depletion in New England from clearcutting and biomass harvesting have recent of the above- ground biomass (boles and branches), raising con- cerns about nutrient removals and impacts

Thorpe, Michael

Note: This page contains sample records for the topic "nutrient dynamics trace" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.