Powered by Deep Web Technologies
Note: This page contains sample records for the topic "discrete atmospheric conditions" 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

Discrete Packet Analysis for Improved Atmospheric Rejection on Modulated Laser Signals  

SciTech Connect (OSTI)

This slide-show discusses how the method of discrete packet analysis improves atmospheric compensation for quasi-CW fluorescence detection methods. This is key to improving remote sensing capabilities.

O'Neill, M., McKenna, I., DiBenedetto, J., Capelle, G., Trainham, R.

2012-07-19T23:59:59.000Z

2

HYPERsensarium : an archive of atmospheric conditions  

E-Print Network [OSTI]

HYPERsensarium proposes a tangible interface of atmospheres for public experience through an archive of historical and projected weathers. While architecture's purpose has long been to act as the technical boundary between ...

Shaw, Kelly E. (Kelly Evelyn)

2013-01-01T23:59:59.000Z

3

Discrete Group Actions on Spacetimes: Causality Conditions and the Causal Boundary  

E-Print Network [OSTI]

Suppose a spacetime $M$ is a quotient of a spacetime $V$ by a discrete group of isometries. It is shown how causality conditions in the two spacetimes are related, and how can one learn about the future causal boundary on $M$ by studying structures in $V$. The relations between the two are particularly simple (the boundary of the quotient is the quotient of the boundary) if both $V$ and $M$ have spacelike future boundaries and if it is known that the quotient of the future completion of $V$ is past-distinguishing. (That last assumption is automatic in the case of $M$ being multi-warped.)

Steven G. Harris

2003-10-14T23:59:59.000Z

4

atmospheric conditions influenced: Topics by E-print Network  

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

to optical depth perturbations. In Earth-type atmospheres sustained planetary greenhouse effect with a stable ground surface temperature can only exist at a particular...

5

atmospheric conditions controlling: Topics by E-print Network  

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

to optical depth perturbations. In Earth-type atmospheres sustained planetary greenhouse effect with a stable ground surface temperature can only exist at a particular...

6

Graph-theoretic analysis of discrete-phase-space states for condition change detection and quantification of information  

SciTech Connect (OSTI)

Data collected from devices and human condition may be used to forewarn of critical events such as machine/structural failure or events from brain/heart wave data stroke. By monitoring the data, and determining what values are indicative of a failure forewarning, one can provide adequate notice of the impending failure in order to take preventive measures. This disclosure teaches a computer-based method to convert dynamical numeric data representing physical objects (unstructured data) into discrete-phase-space states, and hence into a graph (structured data) for extraction of condition change.

Hively, Lee M.

2014-09-16T23:59:59.000Z

7

Econometric Analysis of Discrete-Valued Irregularly-Spaced Financial Transactions Data Using a New Autoregressive Conditional Multinomial Model  

E-Print Network [OSTI]

Lancaster, T. , 1990, The Econometric Analysis of TransitionDEPARTMENT OF ECONOMICS ECONOMETRIC ANALYSIS OF DISCRETE-PAPER 98-10 APRIL 1998 Econometric analysis of discrete-

Russell, Jeffrey; Engle, Robert F

1998-01-01T23:59:59.000Z

8

Description of Atmospheric Conditions at the Pierre Auger Observatory using the Global Data Assimilation System (GDAS)  

SciTech Connect (OSTI)

Atmospheric conditions at the site of a cosmic ray observatory must be known for reconstructing observed extensive air showers. The Global Data Assimilation System (GDAS) is a global atmospheric model predicated on meteorological measurements and numerical weather predictions. GDAS provides altitude-dependent profiles of the main state variables of the atmosphere like temperature, pressure, and humidity. The original data and their application to the air shower reconstruction of the Pierre Auger Observatory are described. By comparisons with radiosonde and weather station measurements obtained on-site in Malargue and averaged monthly models, the utility of the GDAS data is shown.

Abreu, P.; /Lisbon, IST; Aglietta, M.; /Turin U. /INFN, Turin; Ahlers, M.; /Wisconsin U., Madison; Ahn, E.J.; /Fermilab; Albuquerque, I.F.M.; /Sao Paulo U.; Allard, D.; /APC, Paris; Allekotte, I.; /Buenos Aires, CONICET; Allen, J.; /New York U.; Allison, P.; /Ohio State U.; Almela, A.; /Natl. Tech. U., San Nicolas /Buenos Aires, CONICET; Alvarez Castillo, J.; /Mexico U., ICN /Santiago de Compostela U.

2012-01-01T23:59:59.000Z

9

Sulfur capture by oil shale ashes under atmospheric and pressurized FBC conditions  

SciTech Connect (OSTI)

When oil shale contains large quantities of limestone, a significant auto-absorption of sulfur is possible under suitable conditions. The sulfur capture by oil shale ashes has been studied using a pressurized thermogravimetric apparatus. The chosen experimental conditions were typical for atmospheric and pressurized fluidized bed combustion. The Ca/S molar ratios in the two oil shales studied were 8 (Estonian) and 10 (Israeli). The samples were first burned in a gas atmosphere containing O{sub 2} and N{sub 2} (and CO{sub 2} if pressurized). After the combustion step, SO{sub 2} was added and sulfation started. The results with the oil shales were compared to those obtained with an oil shale cyclone ash from the Narva power plant in Estonia. In general, the results from the sulfur capture experiments under both atmospheric and pressurized conditions showed that the oil shale cannot only capture its own sulfur but also significant amounts of additional sulfur of another fuel if the fuels are mixed together. For example from the runs at atmospheric pressure, the conversion of CaO to CaSO{sub 4} was about 70% for Israeli oil shale and about 55% for Estonian oil shale (850 C). For the cyclone ash the corresponding conversion was about 20%. In comparison it could be mentioned that under the same conditions the conversions of natural limestones are about 30%. The reason the cyclone ash was a poor sulfur absorbent was probably due to its temperature history. In Narva the oil shale was burned at a significantly higher temperature (1,400 C) than was used in the experiments (750 C and 850 C). This caused the ash to sinter and the reactive surface area of the cyclone ash was therefore decreased.

Yrjas, K.P.; Hupa, M. [Aabo Akademi Univ., Turku (Finland). Dept. of Chemical Engineering; Kuelaots, I.; Ots, A. [Tallinn Technical Univ. (Estonia). Thermal Engineering Dept.

1995-12-31T23:59:59.000Z

10

IONIZATION IN ATMOSPHERES OF BROWN DWARFS AND EXTRASOLAR PLANETS. III. BREAKDOWN CONDITIONS FOR MINERAL CLOUDS  

SciTech Connect (OSTI)

Electric discharges were detected directly in the cloudy atmospheres of Earth, Jupiter, and Saturn, are debatable for Venus, and indirectly inferred for Neptune and Uranus in our solar system. Sprites (and other types of transient luminous events) have been detected only on Earth, and are theoretically predicted for Jupiter, Saturn, and Venus. Cloud formation is a common phenomenon in ultra-cool atmospheres such as in brown dwarf and extrasolar planetary atmospheres. Cloud particles can be expected to carry considerable charges which may trigger discharge events via small-scale processes between individual cloud particles (intra-cloud discharges) or large-scale processes between clouds (inter-cloud discharges). We investigate electrostatic breakdown characteristics, like critical field strengths and critical charge densities per surface, to demonstrate under which conditions mineral clouds undergo electric discharge events which may trigger or be responsible for sporadic X-ray emission. We apply results from our kinetic dust cloud formation model that is part of the DRIFT-PHOENIX model atmosphere simulations. We present a first investigation of the dependence of the breakdown conditions in brown dwarf and giant gas exoplanets on the local gas-phase chemistry, the effective temperature, and primordial gas-phase metallicity. Our results suggest that different intra-cloud discharge processes dominate at different heights inside mineral clouds: local coronal (point discharges) and small-scale sparks at the bottom region of the cloud where the gas density is high, and flow discharges and large-scale sparks near, and maybe above, the cloud top. The comparison of the thermal degree of ionization and the number density of cloud particles allows us to suggest the efficiency with which discharges will occur in planetary atmospheres.

Helling, Ch.; Jardine, M.; Stark, C. [SUPA, School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS (United Kingdom); Diver, D., E-mail: ch@leap2010.eu [SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ (United Kingdom)

2013-04-20T23:59:59.000Z

11

Monitoring and ANN modeling of coal stockpile behavior under different atmospheric conditions  

SciTech Connect (OSTI)

In this study, an industrial-sized stockpile of 5 m width, 4 m height, and 10 m length was built in a coal stock area to investigate coal stockpile behavior under different atmospheric conditions. The effective parameters on the coal stockpile that were time, weather temperature, atmospheric pressure, air humidity, velocity, and direction of wind values were automatically measured by means of a computer-aided measurement system to obtain Artificial Neural Network (ANN) input data. The coal stockpiles, which should be continuously observed, are capable of spontaneous combustion and then causing serious economical losses due to the mentioned parameters. Afterwards, these measurement values were used for training and testing of the ANN model. Comparison of the experimental and ANN results, accuracy rates of training, and testing were found as 98.6% and 98.7%, respectively. It is shown that possible coal stockpile behavior with this ANN model is powerfully estimated.

Ozdeniz, A.H.; Ozbay, Y.; Yilmaz, N.; Sensogut, C. [Selcuk University, Konya (Turkey). Engineering & Architecture Faculty

2008-07-01T23:59:59.000Z

12

Investigation of coal stockpiles of Tuncbilek thermal power plant with respect to time under atmospheric conditions  

SciTech Connect (OSTI)

Thermal power plants have delayed the coal that they will use at stockpiles mandatorily. If these coal stockpiles remain at the stockyards over a certain period of time, a spontaneous combustion can be started itself. Coal stocks under combustion threat can cost too much economically to coal companies. Therefore, it is important to take some precautions for saving the stockpiles from the spontaneous combustion. In this research a coal stockpile at Tuncbilek Thermal Power Plant which was formed in 5 m wide, 10 m long, and 3 m height with a weight of 120 tons to observe internal temperature changes with respect to time under normal atmospheric conditions. Later, internal temperature measurements were obtained at 20 points distributed all over two layers in the stockpile. The parameters, such as air temperature, humidity, atmosphere pressure, wind speed and direction, which are effective on the stockpiles, were measured and used to obtain the graphs of stockpiles' internal temperature.

Ozdeniz, A.H. [Selcuk University, Konya (Turkey). Dept. of Mining Engineering

2009-07-01T23:59:59.000Z

13

E-Print Network 3.0 - atmospheric stability conditions Sample...  

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

wind park model considering atmospheric stability. Wind... : A simple analytical wind park model considering atmospheric stability. Wind Energy, 13, 459-469. 12... : A...

14

Remote Raman - laser induced breakdown spectroscopy (LIBS) geochemical investigation under Venus atmospheric conditions  

SciTech Connect (OSTI)

The extreme Venus surface temperatures ({approx}740 K) and atmospheric pressures ({approx}93 atm) create a challenging environment for surface missions. Scientific investigations capable of Venus geochemical observations must be completed within hours of landing before the lander will be overcome by the harsh atmosphere. A combined remote Raman - LIBS (Laser Induced Breakdown Spectroscopy) instrument is capable of accomplishing the geochemical science goals without the risks associated with collecting samples and bringing them into the lander. Wiens et al. and Sharma et al. demonstrated that both analytical techniques can be integrated into a single instrument capable of planetary missions. The focus of this paper is to explore the capability to probe geologic samples with Raman - LIBS and demonstrate quantitative analysis under Venus surface conditions. Raman and LIBS are highly complementary analytical techniques capable of detecting both the mineralogical and geochemical composition of Venus surface materials. These techniques have the potential to profoundly increase our knowledge of the Venus surface composition, which is currently limited to geochemical data from Soviet Venera and VEGA landers that collectively suggest a surface composition that is primarily tholeiitic basaltic with some potentially more evolved compositions and, in some locations, K-rich trachyandesite. These landers were not equipped to probe the surface mineralogy as can be accomplished with Raman spectroscopy. Based on the observed compositional differences and recognizing the imprecise nature of the existing data, 15 samples were chosen to constitute a Venus-analog suite for this study, including five basalts, two each of andesites, dacites, and sulfates, and single samples of a foidite, trachyandesite, rhyolite, and basaltic trachyandesite under Venus conditions. LIBS data reduction involved generating a partial least squares (PLS) model with a subset of the rock powder standards to quantitatively determine the major elemental abundance of the remaining samples. PLS analysis suggests that the major element compositions can be determined with root mean square errors ca. 5% (absolute) for SiO{sub 2}, Al{sub 2}O{sub 3}, Fe{sub 2}O{sub 3}(total), MgO, and CaO, and ca. 2% or less for TiO{sub 2}, Cr{sub 2}O{sub 3}, MnO, K{sub 2}O, and Na{sub 2}O. Finally, the Raman experiments have been conducted under supercritical CO{sub 2} involving single-mineral and mixed-mineral samples containing talc, olivine, pyroxenes, feldspars, anhydrite, barite, and siderite. The Raman data have shown that the individual minerals can easily be identified individually or in mixtures.

Clegg, Sanuel M [Los Alamos National Laboratory; Barefield, James E [Los Alamos National Laboratory; Humphries, Seth D [Los Alamos National Laboratory; Wiens, Roger C [Los Alamos National Laboratory; Vaniman, D. T. [Los Alamos National Laboratory; Sharma, S. K. [UNIV OF HAWAII; Misra, A. K. [UNIV OF HAWAII; Dyar, M. D. [MT. HOLYOKE COLLEGE; Smrekar, S. E. [JET PROPULSION LAB.

2010-12-13T23:59:59.000Z

15

Comparison of optical emission from nanosecond and femtosecond laser produced plasma in atmosphere and vacuum conditions  

E-Print Network [OSTI]

for Materials Under eXtreme Environment, School of Nuclear Engineering, Purdue University, 500 Central Drive in an ambient atmosphere environment, the impact of low-pressure envi- ronments is also important for certain and atmosphere environments using identical laser fluences in order to better understand the differ- ences

Harilal, S. S.

16

Microwave plasma based single step method for free standing graphene synthesis at atmospheric conditions  

SciTech Connect (OSTI)

Microwave atmospheric pressure plasmas driven by surface waves were used to synthesize graphene sheets from vaporized ethanol molecules carried through argon plasma. In the plasma, ethanol decomposes creating carbon atoms that form nanostructures in the outlet plasma stream, where external cooling/heating was applied. It was found that the outlet gas stream temperature plays an important role in the nucleation processes and the structural quality of the produced nanostructures. The synthesis of few layers (from one to five) graphene has been confirmed by high-resolution transmission electron microscopy. Raman spectral studies were conducted to determine the ratio of the 2D to G peaks (>2). Disorder D-peak to G-peak intensity ratio decreases when outlet gas stream temperature decreases.

Tatarova, E.; Henriques, J.; Dias, A.; Ferreira, C. M. [Institute of Plasmas and Nuclear Fusion, Instituto Superior Técnico, Technical University of Lisbon (Portugal)] [Institute of Plasmas and Nuclear Fusion, Instituto Superior Técnico, Technical University of Lisbon (Portugal); Luhrs, C. C.; Phillips, J. [Department of Mechanical and Aerospace Engineering, Naval Postgraduate School, Monterey, California 93943 (United States)] [Department of Mechanical and Aerospace Engineering, Naval Postgraduate School, Monterey, California 93943 (United States); Abrashev, M. V. [Faculty of Physics, Sofia University, 1164 Sofia (Bulgaria)] [Faculty of Physics, Sofia University, 1164 Sofia (Bulgaria)

2013-09-23T23:59:59.000Z

17

Fluidized bed pyrolysis of bitumen-impregnated sandstone at sub-atmospheric conditions  

SciTech Connect (OSTI)

A 15.2 cm diameter fluidized bed reactor was designed, built, and operated to study the pyrolysis of oil sands at pressures slightly less than atmospheric. Fluidizing gas flow through the reactor was caused by reducing the pressure above the bed with a gas pump operating in the vacuum mode. Pyrolysis energy was supplied by a propane burner, and the hot propane combustion gases were used for fluidization. The fluidized bed pyrolysis at reduced pressure using combustion gases allowed the reactor to be operated at significantly lower temperatures than previously reported. At 450{degree}, over 80% of the bitumen fed was recovered as a liquid product, and the spent sand contained less than 1% coke. The liquid product recovery system, by design, yielded three liquid streams with distinctly different properties.

Fletcher, J.V.; Deo, M.D.; Hanson, F.V.

1993-03-01T23:59:59.000Z

18

Fluidized bed pyrolysis of bitumen-impregnated sandstone at sub-atmospheric conditions  

SciTech Connect (OSTI)

A 15.2 cm diameter fluidized bed reactor was designed, built, and operated to study the pyrolysis of oil sands at pressures slightly less than atmospheric. Fluidizing gas flow through the reactor was caused by reducing the pressure above the bed with a gas pump operating in the vacuum mode. Pyrolysis energy was supplied by a propane burner, and the hot propane combustion gases were used for fluidization. The fluidized bed pyrolysis at reduced pressure using combustion gases allowed the reactor to be operated at significantly lower temperatures than previously reported. At 450[degree], over 80% of the bitumen fed was recovered as a liquid product, and the spent sand contained less than 1% coke. The liquid product recovery system, by design, yielded three liquid streams with distinctly different properties.

Fletcher, J.V.; Deo, M.D.; Hanson, F.V.

1993-01-01T23:59:59.000Z

19

Bohmian Mechanics with Discrete Operators  

E-Print Network [OSTI]

A deterministic Bohmian mechanics for operators with continuous and discrete spectra is presented. Randomness enters only through initial conditions. Operators with discrete spectra are incorporated into Bohmian mechanics by associating with each operator a continuous variable in which a finite range of the continuous variable correspond to the same discrete eigenvalue. In this way Bohmian mechanics can handle the creation and annihilation of particles. Examples are given and generalizations are discussed.

R. A. Hyman; Shane A. Caldwell; Edward Dalton

2004-01-02T23:59:59.000Z

20

A STUDY ON LEGIONELLA PNEUMOPHILA, WATER CHEMISTRY, AND ATMOSPHERIC CONDITIONS IN COOLING TOWERS AT THE SAVANNAH RIVER SITE  

SciTech Connect (OSTI)

Legionnaires disease is a pneumonia caused by the inhalation of the bacterium Legionella pneumophila. The majority of illnesses have been associated with cooling towers since these devices can harbor and disseminate the bacterium in the aerosolized mist generated by these systems. Historically, Savannah River Site (SRS) cooling towers have had occurrences of elevated levels of Legionella in all seasons of the year and in patterns that are difficult to predict. Since elevated Legionella in cooling tower water are a potential health concern a question has been raised as to the best control methodology. In this work we analyze available chemical, biological, and atmospheric data to determine the best method or key parameter for control. The SRS 4Q Industrial Hygiene Manual, 4Q-1203, 1 - G Cooling Tower Operation and the SRNL Legionella Sampling Program, states that 'Participation in the SRNL Legionella Sampling Program is MANDATORY for all operating cooling towers'. The resulting reports include L. pneumophila concentration information in cells/L. L. pneumophila concentrations >10{sup 7} cells/L are considered elevated and unsafe so action must be taken to reduce these densities. These remedial actions typically include increase biocide addition or 'shocking'. Sometimes additional actions are required if the problem persists including increase tower maintenance (e.g. cleaning). Evaluation of 14 SRS cooling towers, seven water quality parameters, and five Legionella serogroups over a three-plus year time frame demonstrated that cooling tower water Legionella densities varied widely though out this time period. In fact there was no one common consistent significant variable across all towers. The significant factors that did show up most frequently were related to suspended particulates, conductivity, pH, and dissolved oxygen, not chlorine or bromine as might be expected. Analyses of atmospheric data showed that there were more frequent significant elevated Legionella concentrations when the dew point temperature was high--a summertime occurrence. However, analysis of the three years of Legionella monitoring data of the 14 different SRS Cooling Towers demonstrated that elevated concentrations are observed at all temperatures and seasons. The objective of this study is to evaluate the ecology of L. pneumophila including serogroups and population densities, chemical, and atmospheric data, on cooling towers at SRS to determine whether relationships exist among water chemistry, and atmospheric conditions. The goal is to more fully understand the conditions which inhibit or encourage L. pneumophila growth and supply this data and associated recommendations to SRS Cooling Tower personnel for improved management of operation. Hopefully this information could then be used to help control L. pneumophila growth more effectively in SRS cooling tower water.

Smith, C.; Brigmon, R.

2009-10-20T23:59:59.000Z

Note: This page contains sample records for the topic "discrete atmospheric conditions" 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

Observations of Secondary Organic Aerosol Production and Soot Aging under Atmospheric Conditions Using a Novel Environmental Aerosol Chamber  

E-Print Network [OSTI]

of the processes leading to SOA production under ambient gaseous and particulate concentrations as well as the impact these aerosol types have on climate is poorly understood. Although the majority of atmospheric aerosols scatter radiation either directly...

Glen, Crystal

2012-02-14T23:59:59.000Z

22

Adding Complex Terrain and Stable Atmospheric Condition Capability to the Simulator for On/Offshore Wind Farm Applications (SOWFA) (Presentation)  

SciTech Connect (OSTI)

This presentation describes changes made to NREL's OpenFOAM-based wind plant aerodynamics solver so that it can compute the stably stratified atmospheric boundary layer and flow over terrain. Background about the flow solver, the Simulator for Off/Onshore Wind Farm Applications (SOWFA) is given, followed by details of the stable stratification/complex terrain modifications to SOWFA, along with some preliminary results calculations of a stable atmospheric boundary layer and flow over a simple set of hills.

Churchfield, M. J.

2013-06-01T23:59:59.000Z

23

Fabrication of ZnO/Cu2O heterojunctions in atmospheric conditions: improved interface quality and solar cell performance  

E-Print Network [OSTI]

tail (Early view), Adv. Energy Mater. (2014). [8] A.J. Kronemeijer, V. Pecunia, D. Venkateshvaran, M. Nikolka, A. Sadhanala, J. Moriarty, M. Szumilo, H. Sirringhaus, Two-dimensional carrier distribution in top-gate polymer field-effect transistors... conditions and (b) optimized conditions of ZnO AALD deposition. Multiple whisker-, rod- and flower-like formations are present in the standard device. 0.1 0.2 0.3 0.4 0.5 ?8 ?7 ?6 ?5 ?4 ?3 ?2 ?1 0 Voltage V / V C ur re nt d en si ty J / m A cm ?2...

Ievskaya, Y.; Hoye, R. L. Z.; Sadhanala, A.; Musselman, K.; MacManus-Driscoll, J. L.

2014-01-01T23:59:59.000Z

24

Using Mesoscale Weather Model Output as Boundary Conditions for Atmospheric Large-Eddy Simulations and Wind-Plant Aerodynamic Simulations (Presentation)  

SciTech Connect (OSTI)

Wind plant aerodynamics are directly affected by the microscale weather, which is directly influenced by the mesoscale weather. Microscale weather refers to processes that occur within the atmospheric boundary layer with the largest scales being a few hundred meters to a few kilometers depending on the atmospheric stability of the boundary layer. Mesoscale weather refers to large weather patterns, such as weather fronts, with the largest scales being hundreds of kilometers wide. Sometimes microscale simulations that capture mesoscale-driven variations (changes in wind speed and direction over time or across the spatial extent of a wind plant) are important in wind plant analysis. In this paper, we present our preliminary work in coupling a mesoscale weather model with a microscale atmospheric large-eddy simulation model. The coupling is one-way beginning with the weather model and ending with a computational fluid dynamics solver using the weather model in coarse large-eddy simulation mode as an intermediary. We simulate one hour of daytime moderately convective microscale development driven by the mesoscale data, which are applied as initial and boundary conditions to the microscale domain, at a site in Iowa. We analyze the time and distance necessary for the smallest resolvable microscales to develop.

Churchfield, M. J.; Michalakes, J.; Vanderwende, B.; Lee, S.; Sprague, M. A.; Lundquist, J. K.; Moriarty, P. J.

2013-10-01T23:59:59.000Z

25

Analysis and experimental study on formation conditions of large-scale barrier-free diffuse atmospheric pressure air plasmas in repetitive pulse mode  

SciTech Connect (OSTI)

Atmospheric air diffuse plasmas have enormous application potential in various fields of science and technology. Without dielectric barrier, generating large-scale air diffuse plasmas is always a challenging issue. This paper discusses and analyses the formation mechanism of cold homogenous plasma. It is proposed that generating stable diffuse atmospheric plasmas in open air should meet the three conditions: high transient power with low average power, excitation in low average E-field with locally high E-field region, and multiple overlapping electron avalanches. Accordingly, an experimental configuration of generating large-scale barrier-free diffuse air plasmas is designed. Based on runaway electron theory, a low duty-ratio, high voltage repetitive nanosecond pulse generator is chosen as a discharge excitation source. Using the wire-electrodes with small curvature radius, the gaps with highly non-uniform E-field are structured. Experimental results show that the volume-scaleable, barrier-free, homogeneous air non-thermal plasmas have been obtained between the gap spacing with the copper-wire electrodes. The area of air cold plasmas has been up to hundreds of square centimeters. The proposed formation conditions of large-scale barrier-free diffuse air plasmas are proved to be reasonable and feasible.

Li, Lee, E-mail: leeli@mail.hust.edu.cn; Liu, Lun; Liu, Yun-Long; Bin, Yu; Ge, Ya-Feng; Lin, Fo-Chang [State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electric and Electronic Engineering, HuaZhong University of Science and Technology (HUST), Wuhan 430074 (China)

2014-01-14T23:59:59.000Z

26

optimization of discrete control systems with varying structure  

E-Print Network [OSTI]

(in russian). 4. Mansimov, K.B., Maharramov, Sh.F.: Necessary conditions of optimality for discrete system with variable structure and rolling right end of the path.

xx

2004-12-16T23:59:59.000Z

27

Scientific uncertainties in atmospheric mercury models III: Boundary and initial conditions, model grid resolution, and Hg(II) reduction mechanism  

SciTech Connect (OSTI)

In this study, the model response in terms of simulated mercury concentration and deposition to boundary condition (BC), initial condition (IC), model grid resolution (12 km versus 36 km), and two alternative Hg(II) reduction mechanisms, was investigated. The model response to the change of gaseous elemental mercury (GEM) concentration from 0 to 2 ngm3 in IC/BC is found to be very linear (r240.99) based on the results of sensitivity simulations in July 2001. An increase of 1 ngm3 of GEM in BC resulted in an increase of 0.81 ngm3 in the monthly average of total mercury concentration, and 1270 ngm2 in the monthly total deposition. IC has similar but weaker effects compared to those of BC. An increase of 1 ngm3 of GEM in IC resulted in an increase of 0.14 ngm3 in the monthly average of total mercury concentration, and 250 ngm2 in the monthly total deposition. Varying reactive gaseous mercury (RGM) or particulate mercury (PHg) in BC/IC has much less significant impact. Simulation results at different grid resolutions show good agreement (slope 0.950 1.026, r 0.816 0.973) in mercury concentration, dry deposition, and total deposition. The agreement in wet deposition is somewhat weaker (slope 0.770 0.794, r 0.685 0.892) due to the difference in emission dilution and simulated precipitation that subsequently change reaction rates in the aqueous phase. Replacing the aqueous Hg(II)-HO2 reduction by either RGM reduction by CO (51018cm3 molecule1 s1) or photoreduction of RGM (1105 s1) gives significantly better model agreement with the wet deposition measured by Mercury Deposition Network (MDN). Possible ranges of the reduction rates are estimated based on model sensitivity results. The kinetic estimate requires further verification by laboratory studies.

Lin, Che-Jen [ORNL; Pongprueksa, Pruek [Lamar University; Lindberg, Steven Eric [ORNL; Jang, Carey [U.S. Environmental Protection Agency, Raleigh, North Carolina; Braverman, Thomas [U.S. Environmental Protection Agency, Raleigh, North Carolina; Bullock, Russell O [NOAA; Ho, Thomas [ORNL; Chu, Hsing-Wei [Lamar University

2008-03-01T23:59:59.000Z

28

ASSESSMENT OF 90SR AND 137CS PENETRATION INTO REINFORCED CONCRETE (EXTENT OF 'DEEPENING') UNDER NATURAL ATMOSPHERIC CONDITIONS  

SciTech Connect (OSTI)

When assessing the feasibility of remediation following the detonation of a radiological dispersion device or improvised nuclear device in a large city, several issues should be considered including the levels and characteristics of the radioactive contamination, the availability of resources required for decontamination, and the planned future use of the city's structures and buildings. Currently, little is known about radionuclide penetration into construction materials in an urban environment. Knowledge in this area would be useful when considering costs of a thorough decontamination of buildings, artificial structures, and roads in an affected urban environment. Pripyat, a city substantially contaminated by the Chernobyl Nuclear Power Plant accident in April 1986, may provide some answers. The main objective of this study was to assess the depth of {sup 90}Sr and {sup 137}Cs penetration into reinforced concrete structures in a highly contaminated urban environment under natural weather conditions. Thirteen reinforced concrete core samples were obtained from external surfaces of a contaminated building in Pripyat. The concrete cores were drilled to obtain sample layers of 0-5, 5-10, 10-15, 15-20, 20-30, 30-40, and 40-50 mm. Both {sup 90}Sr and {sup 137}Cs were detected in the entire 0-50 mm profile of the reinforced cores sampled. In most of the cores, over 90% of the total {sup 137}Cs inventory and 70% of the total {sup 90}Sr inventory was found in the first 0-5 mm layer of the reinforced concrete. {sup 90}Sr had penetrated markedly deeper into the reinforced concrete structures than {sup 137}Cs.

Farfan, E.; Jannik, T.

2011-10-01T23:59:59.000Z

29

Discrete Element Modeling  

SciTech Connect (OSTI)

The Distinct Element Method (also frequently referred to as the Discrete Element Method) (DEM) is a Lagrangian numerical technique where the computational domain consists of discrete solid elements which interact via compliant contacts. This can be contrasted with Finite Element Methods where the computational domain is assumed to represent a continuum (although many modern implementations of the FEM can accommodate some Distinct Element capabilities). Often the terms Discrete Element Method and Distinct Element Method are used interchangeably in the literature, although Cundall and Hart (1992) suggested that Discrete Element Methods should be a more inclusive term covering Distinct Element Methods, Displacement Discontinuity Analysis and Modal Methods. In this work, DEM specifically refers to the Distinct Element Method, where the discrete elements interact via compliant contacts, in contrast with Displacement Discontinuity Analysis where the contacts are rigid and all compliance is taken up by the adjacent intact material.

Morris, J; Johnson, S

2007-12-03T23:59:59.000Z

30

Visibility in Discrete Geometry: an application to discrete geodesic paths  

E-Print Network [OSTI]

Visibility in Discrete Geometry: an application to discrete geodesic paths David Coeurjolly that are visible from a source pixel. Based on these definitions, we define discrete geodesic paths in dis- crete domain with obstacles. This allows us to introduce a new geodesic metric in discrete geometry

Paris-Sud XI, Université de

31

A discrete fractional random transform  

E-Print Network [OSTI]

We propose a discrete fractional random transform based on a generalization of the discrete fractional Fourier transform with an intrinsic randomness. Such discrete fractional random transform inheres excellent mathematical properties of the fractional Fourier transform along with some fantastic features of its own. As a primary application, the discrete fractional random transform has been used for image encryption and decryption.

Zhengjun Liu; Haifa Zhao; Shutian Liu

2006-05-20T23:59:59.000Z

32

XXZ scalar products, Miwa variables and discrete KP  

E-Print Network [OSTI]

We revisit the quantum/classical integrable model correspondence in the context of inhomogeneous finite length XXZ spin-1/2 chains with periodic boundary conditions and show that the Bethe scalar product of an arbitrary state and a Bethe eigenstate is a discrete KP tau-function. The continuous Miwa variables of discrete KP are the rapidities of the arbitrary state.

O. Foda; G. Schrader

2010-05-21T23:59:59.000Z

33

Atmospheric optical calibration system  

DOE Patents [OSTI]

An atmospheric optical calibration system is provided to compare actual atmospheric optical conditions to standard atmospheric optical conditions on the basis of aerosol optical depth, relative air mass, and diffuse horizontal skylight to global horizontal photon flux ratio. An indicator can show the extent to which the actual conditions vary from standard conditions. Aerosol scattering and absorption properties, diffuse horizontal skylight to global horizontal photon flux ratio, and precipitable water vapor determined on a real-time basis for optical and pressure measurements are also used to generate a computer spectral model and for correcting actual performance response of a photovoltaic device to standard atmospheric optical condition response on a real-time basis as the device is being tested in actual outdoor conditions. 7 figs.

Hulstrom, R.L.; Cannon, T.W.

1988-10-25T23:59:59.000Z

34

Discrete dark matter  

SciTech Connect (OSTI)

We propose a new motivation for the stability of dark matter (DM). We suggest that the same non-Abelian discrete flavor symmetry which accounts for the observed pattern of neutrino oscillations, spontaneously breaks to a Z{sub 2} subgroup which renders DM stable. The simplest scheme leads to a scalar doublet DM potentially detectable in nuclear recoil experiments, inverse neutrino mass hierarchy, hence a neutrinoless double beta decay rate accessible to upcoming searches, while {theta}{sub 13}=0 gives no CP violation in neutrino oscillations.

Hirsch, M.; Morisi, S.; Peinado, E.; Valle, J. W. F. [AHEP Group, Institut de Fisica Corpuscular--C.S.I.C./Universitat de Valencia, Edificio Institutos de Paterna, Apartado 22085, E-46071 Valencia (Spain)

2010-12-01T23:59:59.000Z

35

2D and 3D Visibility in Discrete Geometry: an application to discrete geodesic paths  

E-Print Network [OSTI]

1 2D and 3D Visibility in Discrete Geometry: an application to discrete geodesic paths D discrete geodesic paths in discrete domain with obstacles. This allows us to introduce a new geodesic metric in discrete geometry. Keywords: discrete visibility, geodesic path, distance transform, discrete

Boyer, Edmond

36

Pooling problems: relaxations and discretizations  

E-Print Network [OSTI]

In section 4, we consider a general BLP and discretize one variable in every ...... 1603. 2074. 517372. 50020. 2. 4600. 4099. 1. 329. 349. 48329. 37152. 28673.

2013-09-02T23:59:59.000Z

37

Thermodynamics of discrete quantum processes  

E-Print Network [OSTI]

We define thermodynamic configurations and identify two primitives of discrete quantum processes between configurations for which heat and work can be defined in a natural way. This allows us to uncover a general second law for any discrete trajectory that consists of a sequence of these primitives, linking both equilibrium and non-equilibrium configurations. Moreover, in the limit of a discrete trajectory that passes through an infinite number of configurations, i.e. in the reversible limit, we recover the saturation of the second law. Finally, we show that for a discrete Carnot cycle operating between four configurations one recovers Carnot's thermal efficiency.

Janet Anders; Vittorio Giovannetti

2012-11-01T23:59:59.000Z

38

The algebra of discrete torsion  

E-Print Network [OSTI]

Oct 1, 2004 ... ... of Vafa's and Douglas's picture of discrete torsion, J. High Energy ... Quasi Hopf algebras, group cohomology and orbifold models, Nuclear.

2004-10-13T23:59:59.000Z

39

Discrete-Gauss states and the generation of focussing dark beams  

E-Print Network [OSTI]

Discrete-Gauss states are a new class of gaussian solutions of the free Schr\\"odinger equation owning discrete rotational symmetry. They are obtained by acting with a discrete deformation operator onto Laguerre-Gauss modes. We present a general analytical construction of these states and show the necessary and sufficient condition for them to host embedded dark beams structures. We unveil the intimate connection between discrete rotational symmetry, orbital angular momentum, and the generation of focussing dark beams. The distinguishing features of focussing dark beams are discussed. The potential applications of Discrete-Gauss states in advanced optical trapping and quantum information processing are also briefly discussed.

Albert Ferrando

2014-03-25T23:59:59.000Z

40

Atmospheric Neutrinos  

E-Print Network [OSTI]

This paper is a brief overview of the theory and experimental data of atmospheric neutrino production at the fiftieth anniversary of the experimental discovery of neutrinos.

Thomas K. Gaisser

2006-12-11T23:59:59.000Z

Note: This page contains sample records for the topic "discrete atmospheric conditions" 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

Discrete generalized multigroup theory and applications  

E-Print Network [OSTI]

This study develops a fundamentally new discrete generalized multigroup energy expansion theory for the linear Boltzmann transport equation. Discrete orthogonal polynomials are used, in conjunction with the traditional ...

Zhu, Lei, Ph. D. Massachusetts Institute of Technology

2012-01-01T23:59:59.000Z

42

Modern theories of discrete time  

E-Print Network [OSTI]

We review some modern theories about the structure of space and time, in particular those related to discrete space and time. Following an epistemological method we start from theories which discuss discrete space and time as a mathematical tool to solve physical models. Antother theories look for physical content of the discrete structure of space and time, based in relational theories of space and time which are derived from the relations of some fundamental entities. Finally we present some philosophical positions who try to find the ontological foundation of the relational theories os space and time.

M. Lorente

2003-12-31T23:59:59.000Z

43

Discrete Structures for Computer Science  

E-Print Network [OSTI]

-5% Final Exam 40% #12;Why Discrete Math? Design efficient computer systems. ·How did Google manage to build issues. #12;16 Sub-Category Graph No Threshold New Science of Networks NYS Electric Power Grid (Thorp

Dragan, Feodor F.

44

On discretizations of axisymmetric systems  

E-Print Network [OSTI]

In this paper we discuss stability properties of various discretizations for axisymmetric systems including the so called cartoon method which was proposed by Alcubierre, Brandt et.al. for the simulation of such systems on Cartesian grids. We show that within the context of the method of lines such discretizations tend to be unstable unless one takes care in the way individual singular terms are treated. Examples are given for the linear axisymmetric wave equation in flat space.

J. Frauendiener

2002-07-24T23:59:59.000Z

45

System for time-discretized vacuum ultraviolet spectroscopy of spark breakdown in air  

SciTech Connect (OSTI)

A system for time-discretized spectroscopic measurements of the vacuum ultraviolet (VUV) emission from spark discharges in the 60-160 nm range has been developed for the study of early plasma-forming phenomena. The system induces a spark discharge in an environment close to atmospheric conditions created using a high speed puff value, but is otherwise kept at high vacuum to allow for the propagation of VUV light. Using a vertical slit placed 1.5 mm from the discharge the emission from a small cross section of the discharge is allowed to pass into the selection chamber consisting of a spherical grating, with 1200 grooves/mm, and an exit slit set to 100 ?m. Following the exit slit is a photomultiplier tube with a sodium salicylate scintillator that is used for the time discretized measurement of the VUV signal with a temporal resolution limit of 10 ns. Results from discharges studied in dry air, Nitrogen, SF{sub 6}, and Argon indicate the emission of light with wavelengths shorter than 120 nm where the photon energy begins to approach the regime of direct photoionization.

Ryberg, D.; Fierro, A.; Dickens, J.; Neuber, A. [Center for Pulsed Power and Power Electronics, Department of Electrical and Computer Engineering and Department of Physics, Texas Tech University, Lubbock, Texas 79409 (United States)

2014-10-15T23:59:59.000Z

46

Environmental Conditions Environmental Conditions  

E-Print Network [OSTI]

Environmental Conditions Environmental Conditions Appendix II The unique geology, hydrology and instream habitat. This chapter examines how environmental conditions in the Deschutes watershed affect, the discussion characterizes the environmental conditions within three watershed areas: the Lower Deschutes

47

Description and validation of ERAD: An atmospheric dispersion model for high explosive detonations  

SciTech Connect (OSTI)

The Explosive Release Atmospheric Dispersion (ERAD) model is a three-dimensional numerical simulation of turbulent atmospheric transport and diffusion. An integral plume rise technique is used to provide a description of the physical and thermodynamic properties of the cloud of warm gases formed when the explosive detonates. Particle dispersion is treated as a stochastic process which is simulated using a discrete time Lagrangian Monte Carlo method. The stochastic process approach permits a more fundamental treatment of buoyancy effects, calm winds and spatial variations in meteorological conditions. Computational requirements of the three-dimensional simulation are substantially reduced by using a conceptualization in which each Monte Carlo particle represents a small puff that spreads according to a Gaussian law in the horizontal directions. ERAD was evaluated against dosage and deposition measurements obtained during Operation Roller Coaster. The predicted contour areas average within about 50% of the observations. The validation results confirm the model`s representation of the physical processes.

Boughton, B.A.; DeLaurentis, J.M.

1992-10-01T23:59:59.000Z

48

Numerical Valuation of Discrete Barrier Options with  

E-Print Network [OSTI]

Numerical Valuation of Discrete Barrier Options with the Adaptive Mesh Model and Other Competing for discrete barrier options such that many methods have been suggested and declared to price discrete barrier options fast and accurately but no one can tell exactly that what method is the best. We also make

Chu, Hao-hua

49

Discrete and Hybrid Nonholonomy Antonio Bicchi1  

E-Print Network [OSTI]

Discrete and Hybrid Nonholonomy Antonio Bicchi1 , Alessia Marigo2 , and Benedetto Piccoli3 1 Centro such as cars, trucks with trailers, rolling 3D objects, underactuated mechanisms, satellites, etc., has made of systems, allowing for discrete and hybrid (mixed continuous and discrete) configurations and transi- tions

Piccoli, Benedetto

50

Final Report for DOE grant DE-FG02-07ER64432 "New Grid and Discretization Technologies for Ocean and Ice Simulations"  

SciTech Connect (OSTI)

The work reported is in pursuit of these goals: high-quality unstructured, non-uniform Voronoi and Delaunay grids; improved finite element and finite volume discretization schemes; and improved finite element and finite volume discretization schemes. These are sought for application to spherical and three-dimensional applications suitable for ocean, atmosphere, ice-sheet, and other climate modeling applications.

Gunzburger, Max

2013-03-12T23:59:59.000Z

51

An Efficient Approach for Optical Radiative Transfer Tomography using the Spherical Harmonics Discrete Ordinates Method  

E-Print Network [OSTI]

This paper introduces a method to preform optical tomography, using 3D radiative transfer as the forward model. We use an iterative approach predicated on the Spherical Harmonics Discrete Ordinates Method (SHDOM) to solve the optimization problem in a scalable manner. We illustrate with an application in remote sensing of a cloudy atmosphere.

Levis, Aviad; Aides, Amit; Davis, Anthony B

2015-01-01T23:59:59.000Z

52

VARIATIONAL ESTIMATES FOR DISCRETE SCHR  

E-Print Network [OSTI]

­dimensional discrete SchrË?odinger operator. We prove that if # ess (H) # [-2, 2], then H-H 0 is compact and # ess (H V = 0. One of our main results in this paper is Theorem 1. If # ess (H) # [-2, 2], then V (n) # 0 that # ess (H) = [-2, 2] if and only if V (n) # 0. Our motivation for this result came from two sources

53

Discretized configurations and partial partitions  

E-Print Network [OSTI]

We show that the discretized configuration space of $k$ points in the $n$-simplex is homotopy equivalent to a wedge of spheres of dimension $n-k+1$. This space is homeomorphic to the order complex of the poset of ordered partial partitions of $\\{1,\\...,n+1\\}$ with exactly $k$ parts. We also compute the Euler characteristic in two different ways, thereby obtaining a topological proof of a combinatorial recurrence satisfied by the Stirling numbers of the second kind.

Abrams, Aaron; Hower, Valerie

2010-01-01T23:59:59.000Z

54

Atmosphere Model  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth (AOD)ProductssondeadjustsondeadjustAbout theOFFICEAmesApplication2ArgonneAssemblyDemandPlasma4 Medicare5Dust

55

Atmospheric Aerosol Systems | EMSL  

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

Science Themes Atmospheric Aerosol Systems Overview Atmospheric Aerosol Systems Biosystem Dynamics & Design Energy Materials & Processes Terrestrial & Subsurface Ecosystems...

56

Bell's Jump Process in Discrete Time  

E-Print Network [OSTI]

The jump process introduced by J. S. Bell in 1986, for defining a quantum field theory without observers, presupposes that space is discrete whereas time is continuous. In this letter, our interest is to find an analogous process in discrete time. We argue that a genuine analog does not exist, but provide examples of processes in discrete time that could be used as a replacement.

Jonathan Barrett; Matthew Leifer; Roderich Tumulka

2005-09-27T23:59:59.000Z

57

Dispersion Estimates for One-dimensional Discrete Schrödinger and Wave Equations  

E-Print Network [OSTI]

We derive dispersion estimates for solutions of the one-dimensional discrete perturbed Schr\\"odinger and wave equations. In particular, we improve upon previous works and weaken the conditions on the potentials. To this end we also provide new results concerning scattering for one-dimensional discrete perturbed Schr\\"odinger operators which are of independent interest. Most notably we show that the reflection and transmission coefficients belong to the Wiener algebra.

Iryna Egorova; Elena Kopylova; Gerald Teschl

2014-10-31T23:59:59.000Z

58

Towards Industrial Strength Discrete Optimization via Simulation...  

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

Towards Industrial Strength Discrete Optimization via Simulation: Multi-Fidelity Optimization and Data-Driven Robustness Event Sponsor: Mathematics and Computing Science - LANS...

59

Discrete particle transport in porous media : discrete observations of physical mechanisms influencing particle behavior  

E-Print Network [OSTI]

An understanding of how discrete particles in the micron to submicron range behave in porous media is important to a number of environmental problems. Discrete particle behavior in the interior of a porous medium is complex ...

Yoon, Joon Sik, 1973-

2005-01-01T23:59:59.000Z

60

Discrete analysis of stochastic NMR  

SciTech Connect (OSTI)

Stochastic NMR is an efficient technique for high field in vivo imaging and spectroscopic studies in cases where the peak rf power required may be prohibitively high for conventional pulsed NMR techniques. This dissertation presents a theoretical analysis of a stochastic NMR method of acquiring spectroscopy data. The spin system is excited with rf pulses where the flip angles or the phases of the pulses are samples of a discrete stochastic process. The method is formulated as a stochastic difference equation which is then converted to ordinary deterministic difference equations describing the input-output cross-correlation, average signal power and signal power spectrum. The solutions of these equations are used to evaluate the stochastic, technique in terms of peak rf power requirement, spectral distortions and signal-to-noise ratio. Experimental results are also presented which verify the results of the discrete analysis. The analysis shows that the maximum signal-to-noise ratio is achieved when the RMS flip angle is approximately the Ernst angle. When the RMS flip angle is below the Ernst angle, the input-output cross-correlation is a good estimate of the FID. Increase of excitation power causes line broadening. In addition, the use of random flip angle, fixed phase excitation causes a notch artifact and non-uniform response across the spectrum both of which are not found in two new types of excitation, the random phase excitation and the random quadrature excitation. The signal power spectrum is also a good estimate of the real spectrum. The approximation of the cross-correlation by a time average causes systematic noise. The amount of systematic noise is found to be significantly reduced when an entire maximum length sequence (MLS) is used for excitation. Noise-like distortion at high power MLS excitation is discovered to be related to the number of feedback paths in the MLS generator. 29 refs., 58 figs.

Wong, Sam Tak-Sum

1988-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "discrete atmospheric conditions" 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

Fast Computation Algorithm for Discrete Resonances among Gravity Waves  

E-Print Network [OSTI]

Traditionally resonant interactions among short waves, with large real wave-numbers, were described statistically and only a small domain in spectral space with integer wave-numbers, discrete resonances, had to be studied separately in resonators. Numerical simulations of the last few years showed unambiguously the existence of some discrete effects in the short-waves part of the wave spectrum. Newly presented model of laminated turbulence explains theoretically appearance of these effects thus putting a novel problem - construction of fast algorithms for computation of solutions of resonance conditions with integer wave-numbers of order $10^3$ and more. Example of such an algorithm for 4-waves interactions of gravity waves is given. Its generalization on the different types of waves is briefly discussed.

Elena Kartashova

2006-05-25T23:59:59.000Z

62

Verifying Volume Rendering Using Discretization Error Analysis  

E-Print Network [OSTI]

Verifying Volume Rendering Using Discretization Error Analysis Tiago Etiene, Daniel Jo¨nsson, Timo--We propose an approach for verification of volume rendering correctness based on an analysis of the volume rendering integral, the basis of most DVR algorithms. With respect to the most common discretization

Kirby, Mike

63

Introduction Discrete-time autoregressive process  

E-Print Network [OSTI]

Introduction Discrete-time autoregressive process Continuous-time Ornstein-Uhlenbeck process Sharp large deviations for the non-stationary Ornstein-Uhlenbeck process Bernard Bercu Bordeaux University-Uhlenbeck process 1 / 46 #12;Introduction Discrete-time autoregressive process Continuous-time Ornstein

Di Girolami, Cristina

64

Extreme events in discrete nonlinear lattices  

E-Print Network [OSTI]

We perform statistical analysis on discrete nonlinear waves generated though modulational instability in the context of the Salerno model that interpolates between the intergable Ablowitz-Ladik (AL) equation and the nonintegrable discrete nonlinear Schrodinger (DNLS) equation. We focus on extreme events in the form of discrete rogue or freak waves that may arise as a result of rapid coalescence of discrete breathers or other nonlinear interaction processes. We find power law dependence in the wave amplitude distribution accompanied by an enhanced probability for freak events close to the integrable limit of the equation. A characteristic peak in the extreme event probability appears that is attributed to the onset of interaction of the discrete solitons of the AL equation and the accompanied transition from the local to the global stochasticity monitored through the positive Lyapunov exponent of a nonlinear map.

A. Maluckov; Lj. Hadzievski; N. Lazarides; G. P. Tsironis

2009-01-22T23:59:59.000Z

65

A Discrete Event Simulation Model For Unstructured Supervisory Control  

E-Print Network [OSTI]

A Discrete Event Simulation Model For Unstructured Supervisory Control Of Unmanned Vehicles Committee #12;2 A Discrete Event Simulation Model For Unstructured Supervisory Control Of Unmanned multipleoperator multiplevehicle discrete event simulation model (MOMUVDES) is developed which captures

Cummings, Mary "Missy"

66

Harmonic pinnacles in the Discrete Gaussian model  

E-Print Network [OSTI]

The 2D Discrete Gaussian model gives each height function $\\eta : \\mathbb{Z}^2\\to\\mathbb{Z}$ a probability proportional to $\\exp(-\\beta \\mathcal{H}(\\eta))$, where $\\beta$ is the inverse-temperature and $\\mathcal{H}(\\eta) = \\sum_{x\\sim y}(\\eta_x-\\eta_y)^2$ sums over nearest-neighbor bonds. We consider the model at large fixed $\\beta$, where it is flat unlike its continuous analog (the Gaussian Free Field). We first establish that the maximum height in an $L\\times L$ box with 0 boundary conditions concentrates on two integers $M,M+1$ with $M\\sim \\sqrt{(1/2\\pi\\beta)\\log L\\log\\log L}$. The key is a large deviation estimate for the height at the origin in $\\mathbb{Z}^2$, dominated by "harmonic pinnacles", integer approximations of a harmonic variational problem. Second, in this model conditioned on $\\eta\\geq 0$ (a floor), the average height rises, and in fact the height of almost all sites concentrates on levels $H,H+1$ where $H\\sim M/\\sqrt{2}$. This in particular pins down the asymptotics, and corrects the order, in results of Bricmont, El-Mellouki and Fr\\"ohlich (1986), where it was argued that the maximum and the height of the surface above a floor are both of order $\\sqrt{\\log L}$. Finally, our methods extend to other classical surface models (e.g., restricted SOS), featuring connections to $p$-harmonic analysis and alternating sign matrices.

Eyal Lubetzky; Fabio Martinelli; Allan Sly

2014-05-20T23:59:59.000Z

67

From nothing to something: discrete integrable systems  

E-Print Network [OSTI]

Chinese ancient sage Laozi said that everything comes from `nothing'. Einstein believes the principle of nature is simple. Quantum physics proves that the world is discrete. And computer science takes continuous systems as discrete ones. This report is devoted to deriving a number of discrete models, including well-known integrable systems such as the KdV, KP, Toda, BKP, CKP, and special Viallet equations, from `nothing' via simple principles. It is conjectured that the discrete models generated from nothing may be integrable because they are identities of simple algebra, model-independent nonlinear superpositions of a trivial integrable system (Riccati equation), index homogeneous decompositions of the simplest geometric theorem (the angle bisector theorem), as well as the M\\"obious transformation invariants.

S Y Lou; Yu-qi Li; Xiao-yan Tang

2014-07-27T23:59:59.000Z

68

A discrete curvature on a planar graph  

E-Print Network [OSTI]

Given a planar graph derived from a spherical, euclidean or hyperbolic tessellation, one can define a discrete curvature by combinatorial properties, which after embedding the graph in a compact 2d-manifold, becomes the Gaussian curvature.

M. Lorente

2004-12-20T23:59:59.000Z

69

atmospheric pressure plasmas: Topics by E-print Network  

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

atmospheric conditions. Our module is capable of measuring temperature, pressure, wind speed, and particle concentration. The module will take measurements every minute and the...

70

atmospheric pressure radio: Topics by E-print Network  

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

atmospheric conditions. Our module is capable of measuring temperature, pressure, wind speed, and particle concentration. The module will take measurements every minute and the...

71

atmospheric pressure plasma: Topics by E-print Network  

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

atmospheric conditions. Our module is capable of measuring temperature, pressure, wind speed, and particle concentration. The module will take measurements every minute and the...

72

Port-Hamiltonian systems on discrete manifolds  

E-Print Network [OSTI]

This paper offers a geometric framework for modeling port-Hamiltonian systems on discrete manifolds. The simplicial Dirac structure, capturing the topological laws of the system, is defined in terms of primal and dual cochains related by the coboundary operators. This finite-dimensional Dirac structure, as discrete analogue of the canonical Stokes-Dirac structure, allows for the formulation of finite-dimensional port-Hamiltonian systems that emulate the behaviour of the open distributed-parameter systems with Hamiltonian dynamics.

Marko Seslija; Jacquelien M. A. Scherpen; Arjan van der Schaft

2012-01-27T23:59:59.000Z

73

Energy Levels of "Hydrogen Atom" in Discrete Time Dynamics  

E-Print Network [OSTI]

We analyze dynamical consequences of a conjecture that there exists a fundamental (indivisible) quant of time. In particular we study the problem of discrete energy levels of hydrogen atom. We are able to reconstruct potential which in discrete time formalism leads to energy levels of unperturbed hydrogen atom. We also consider linear energy levels of quantum harmonic oscillator and show how they are produced in the discrete time formalism. More generally, we show that in discrete time formalism finite motion in central potential leads to discrete energy spectrum, the property which is common for quantum mechanical theory. Thus deterministic (but discrete time!) dynamics is compatible with discrete energy levels.

Andrei Khrennikov; Yaroslav Volovich

2006-04-27T23:59:59.000Z

74

Green's function of a finite chain and the discrete Fourier transform  

E-Print Network [OSTI]

A new expression for the Green's function of a finite one-dimensional lattice with nearest neighbor interaction is derived via discrete Fourier transform. Solution of the Heisenberg spin chain with periodic and open boundary conditions is considered as an example. Comparison to Bethe ansatz clarifies the relation between the two approaches.

S. Cojocaru

2007-04-22T23:59:59.000Z

75

The inverse scattering problem for a discrete Sturm-Liouville equation on the line  

SciTech Connect (OSTI)

This paper investigates the inverse scattering problem for a discrete Sturm-Liouville equation on the entire line with coefficients that stabilize to zero in one direction. We derive a necessary and a sufficient condition on the scattering data so that the inverse problem is uniquely solvable. Bibliography: 23 titles.

Khanmamedov, Agil Kh [Baku State University, Baku (Azerbaijan)

2011-07-31T23:59:59.000Z

76

Climate Sciences: Atmospheric Thermodynamics  

E-Print Network [OSTI]

1 Climate Sciences: Atmospheric Thermodynamics Instructor: Lynn Russell, NH343 http://aerosol.ucsd.edu/courses.html Text: Curry & Webster Atmospheric Thermodynamics Ch1 Composition Ch2 Laws Ch3 Transfers Ch12 Energy Climate Sciences: Atmospheric Thermodynamics Instructor: Lynn Russell, NH343 http

Russell, Lynn

77

5, 60416076, 2005 Atmospheric  

E-Print Network [OSTI]

opportunity to examine atmospheric oxidation in a megacity that has more pollution than typical USACPD 5, 6041­6076, 2005 Atmospheric oxidation in the Mexico City Metropolitan Area T. R. Shirley et.atmos-chem-phys.org/acpd/5/6041/ SRef-ID: 1680-7375/acpd/2005-5-6041 European Geosciences Union Atmospheric Chemistry

Boyer, Edmond

78

Atmospheric sampling glow discharge ionization source  

DOE Patents [OSTI]

An atmospheric sampling glow discharge ionization source that can be used in combination with an analytical instrument which operates at high vacuum, such as a mass spectrometer. The atmospheric sampling glow discharge ionization source comprises a chamber with at least one pair of electrodes disposed therein, an inlet for a gaseous sample to be analyzed and an outlet communicating with an analyzer which operates at subatmospheric pressure. The ionization chamber is maintained at a pressure below atmospheric pressure, and a voltage difference is applied across the electrodes to induce a glow discharge between the electrodes, so that molecules passing through the inlet are ionized by the glow discharge and directed into the analyzer. The ionization source accepts the sample under atmospheric pressure conditions and processes it directly into the high vacuum instrument, bridging the pressure gap and drawing off unwanted atmospheric gases. The invention also includes a method for analyzing a gaseous sample using the glow discharge ionization source described above. 3 figs.

McLuckey, S.A.; Glish, G.L.

1989-07-18T23:59:59.000Z

79

AtmosphericAtmospheric Composition Introduction The division investigates the atmospheric  

E-Print Network [OSTI]

development on observation side was the installation of an ozone observation station in Surinam in close co-operation with the Surinam Meteorological Service. Processes in the tropical regions are important for the global climate and the global atmospheric composition. The participation in Indoex (Indian Ocean Experiment) and this Surinam

Haak, Hein

80

Discrete R Symmetries and Low Energy Supersymmetry  

E-Print Network [OSTI]

MN-2 )1/N+1 . (8) But the minimum near the origin persists, with positive energy ( f2), so the susyDiscrete R Symmetries and Low Energy Supersymmetry UC Davis, 2011 Michael Dine Department R Symmetries and Low Energy Supersymmetry #12;Plan for Today: "New, Improved" Models of Dynamical

California at Santa Cruz, University of

Note: This page contains sample records for the topic "discrete atmospheric conditions" 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

Discrete Optimization A simulated annealing approach  

E-Print Network [OSTI]

for the constrained and the unconstrained circular cutting problem based upon simulated annealing. We define an energyDiscrete Optimization A simulated annealing approach for the circular cutting problem Mhand Hifi corner of the initial rectangle. Such values of the energy correspond to configurations where pieces

Zissimopoulos, Vassilis

82

Massively Parallel Computation of Discrete Logarithms \\Lambda  

E-Print Network [OSTI]

an order of magnitude using such an analysis. Among the reasons for this are: ffl if a high­level language, keeping in mind that log g a is only determined modulo the multiplicative order of g. For general be extremely useful to chart the increase in difficulty of computing discrete logarithms as the field size

McCurley, Kevin

83

Massively Parallel Computation of Discrete Logarithms  

E-Print Network [OSTI]

an order of magnitude using such an analysis. Among the reasons for this are: · if a high-level language, keeping in mind that logg a is only determined modulo the multiplicative order of g. For general be extremely useful to chart the increase in difficulty of computing discrete logarithms as the field size

Gordon, Dan

84

Comment on ``Discrete Boltzmann Equation for Microfluidics''  

E-Print Network [OSTI]

Comment on ``Discrete Boltzmann Equation for Microfluidics'' In a recent Letter [1], Li and Kwok use a lattice Boltzmann equation (LBE) for microfluidics. Their main claim is that an LBE model for microfluidics can be constructed based on the ``Bhatnagar-Gross-Kooky [sic]'' model by including ``the

Luo, Li-Shi

85

Quantum Gravity Phenomenology, Lorentz Invariance and Discreteness  

E-Print Network [OSTI]

Quantum Gravity Phenomenology, Lorentz Invariance and Discreteness Fay Dowker #3; , Joe Henson y invariant, and we recall the reasons why. For illustration, we introduce a phenomenological model of massive { LLI violating phenomenological e#11;ects of quantum gravity { has grown up around this idea

Sorkin, Rafael Dolnick

86

Fast mix table construction for material discretization  

SciTech Connect (OSTI)

An effective hybrid Monte Carlo-deterministic implementation typically requires the approximation of a continuous geometry description with a discretized piecewise-constant material field. The inherent geometry discretization error can be reduced somewhat by using material mixing, where multiple materials inside a discrete mesh voxel are homogenized. Material mixing requires the construction of a 'mix table,' which stores the volume fractions in every mixture so that multiple voxels with similar compositions can reference the same mixture. Mix table construction is a potentially expensive serial operation for large problems with many materials and voxels. We formulate an efficient algorithm to construct a sparse mix table in O(number of voxels x log number of mixtures) time. The new algorithm is implemented in ADVANTG and used to discretize continuous geometries onto a structured Cartesian grid. When applied to an end-of-life MCNP model of the High Flux Isotope Reactor with 270 distinct materials, the new method improves the material mixing time by a factor of 100 compared to a naive mix table implementation. (authors)

Johnson, S. R. [Oak Ridge National Laboratory, Oak Ridge, TN 37831 (United States)

2013-07-01T23:59:59.000Z

87

All-optical discrete vortex switch  

SciTech Connect (OSTI)

We introduce discrete vortex solitons and vortex breathers in circular arrays of nonlinear waveguides. The simplest vortex breather in a four-waveguide coupler is a nonlinear dynamic state changing its topological charge between +1 and -1 periodically during propagation. We find the stability domain for this solution and suggest an all-optical vortex switching scheme.

Desyatnikov, Anton S. [Nonlinear Physics Center, Research School of Physics and Engineering, Australian National University, Canberra, ACT 0200 (Australia); Dennis, Mark R. [H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL (United Kingdom); Ferrando, Albert [Interdisciplinary Modeling Group, InterTech and Departament d'Optica, Universitat de Valencia, E-46100 Burjassot (Spain)

2011-06-15T23:59:59.000Z

88

On the discrete bicycle transformation S. Tabachnikov  

E-Print Network [OSTI]

On the discrete bicycle transformation S. Tabachnikov E. Tsukerman 1 Introduction The motivation for this paper comes from the study of a simple model of bicycle motion. The bicycle is modeled as an oriented segment in the plane of fixed length , the wheelbase of the bicycle. The motion is constrained so

Tabachnikov, Sergei

89

Discrete Spectral Transformations of Skew Orthogonal Polynomials and Associated Discrete Integrable Systems  

E-Print Network [OSTI]

Discrete spectral transformations of skew orthogonal polynomials are presented. From these spectral transformations, it is shown that the corresponding discrete integrable systems are derived both in 1+1 dimension and in 2+1 dimension. Especially in the (2+1)-dimensional case, the corresponding system can be extended to 2x2 matrix form. The factorization theorem of the Christoffel kernel for skew orthogonal polynomials in random matrix theory is presented as a by-product of these transformations.

Hiroshi Miki; Hiroaki Goda; Satoshi Tsujimoto

2012-02-29T23:59:59.000Z

90

Discrete spectral transformations of skew orthogonal polynomials and associated discrete integral systems  

E-Print Network [OSTI]

Discrete spectral transformations of skew orthognal polynomials are presented. From these spectral transformations, it is shown that the corresponding discrete integrable systems are derived both in 1+1 dimension and in 2+1 dimension. Especially in the 2+1 dimensional case, the corresponding system can be extended to 2x2 matrix form. The factorization theorem of the skew-Christoffel kernel in random matrix theory is presented as a by-product of these transformations.

Miki, Hiroshi; Tsujimoto, Satoshi

2011-01-01T23:59:59.000Z

91

Math 209 Discrete Mathematics Spring 2008 Instructor Amites Sarkar  

E-Print Network [OSTI]

Math 209 Discrete Mathematics Spring 2008 Instructor Amites Sarkar Text Discrete Mathematics, Tuesdays, Thursdays and Fridays, in 216 Bond Hall. My phone number is 650 7569 and my e-mail is amites.sarkar

Sarkar, Amites

92

Math 209 Discrete Mathematics Spring 2011 Instructor Dr. Amites Sarkar  

E-Print Network [OSTI]

Math 209 Discrete Mathematics Spring 2011 Instructor Dr. Amites Sarkar Text Discrete Mathematics, in 216 Bond Hall. My phone number is 650 7569 and my e-mail is amites.sarkar@wwu.edu #12;

Sarkar, Amites

93

Math 209 Discrete Mathematics Winter 2009 Instructor Amites Sarkar  

E-Print Network [OSTI]

Math 209 Discrete Mathematics Winter 2009 Instructor Amites Sarkar Text Discrete Mathematics, Tuesdays, Thursdays and Fridays, in 216 Bond Hall. My phone number is 650 7569 and my e-mail is amites.sarkar

Sarkar, Amites

94

Atmospheric Neutrino Fluxes  

E-Print Network [OSTI]

Starting with an historical review, I summarize the status of calculations of the flux of atmospheric neutrinos and how they compare to measurements.

Thomas K. Gaisser

2005-02-18T23:59:59.000Z

95

Thermal depinning of fluxons in discrete Josephson rings  

SciTech Connect (OSTI)

We study the thermal depinning of single fluxons in rings made of Josephson junctions. Due to thermal fluctuations a fluxon can be excited from its energy minima and move through the array, causing a voltage across each junction. We find that for the initial depinning, the fluxon behaves as a single particle and follows a Kramers-type escape law. However, under some conditions this single-particle description breaks down. At low values of the discreteness parameter and low values of the damping, the depinning rate is larger than what the single-particle result would suggest. In addition, for some values of the parameters the fluxon can undergo low-voltage diffusion before switching to the high-voltage whirling mode. This type of diffusion is similar to phase diffusion in a single junction but occurs without frequency-dependent damping. We study the switching to the whirling state as well.

Mazo, J. J. [Departamento de Fisica de la Materia Condensada, Universidad de Zaragoza, 50009 Zaragoza (Spain); Instituto de Ciencia de Materiales de Aragon, CSIC-Universidad de Zaragoza, 50009 Zaragoza (Spain); Naranjo, F. [Departamento de Fisica de la Materia Condensada, Universidad de Zaragoza, 50009 Zaragoza (Spain); Instituto de Ciencia de Materiales de Aragon, CSIC-Universidad de Zaragoza, 50009 Zaragoza (Spain); Universidad Pedagogica y Tecnologica de Colombia, Tunja (Colombia); Segall, K. [Department of Physics and Astronomy, Colgate University, Hamilton, New York 13346 (United States)

2008-11-01T23:59:59.000Z

96

Atmospheric Thermodynamics Composition  

E-Print Network [OSTI]

1 Atmospheric Thermodynamics Ch1 Composition Ch2 Laws Ch3 Transfers Ch12 EnergyBalance Ch4 Water Ch Sciences: Atmospheric Thermodynamics Instructor: Lynn Russell, NH343 http #12;2 Review from Ch. 1 · Thermodynamic quantities · Composition · Pressure · Density · Temperature

Russell, Lynn

97

Atmospheric Dynamics II Instructor  

E-Print Network [OSTI]

AT602 Atmospheric Dynamics II 2 credits Instructor: David W. J. Thompson davet: An Introduction to Dynamic Meteorology, 5th Edition, Academic Press (recommended) · Marshall, J., and Plumb, R. A., 2008: Atmosphere, Ocean, and Climate Dynamics: An Introductory Text, Academic Press. · Vallis, G. K

98

Discrete Abelian gauge symmetries and axions  

E-Print Network [OSTI]

We combine two popular extensions of beyond the Standard Model physics within the framework of intersecting D6-brane models: discrete Zn symmetries and Peccei-Quinn axions. The underlying natural connection between both extensions is formed by the presence of massive U(1) gauge symmetries in D-brane model building. Global intersecting D6-brane models on toroidal orbifolds of the type T6/Z2N and T6/Z2xZ2M with discrete torsion offer excellent playgrounds for realizing these extensions. A generation-dependent Z2 symmetry is identified in a global Pati-Salam model, while global left-right symmetric models give rise to supersymmetric realizations of the DFSZ axion model. In one class of the latter models, the axion as well as Standard Model particles carry a non-trivial Z3 charge.

Honecker, Gabriele

2015-01-01T23:59:59.000Z

99

Discrete Abelian gauge symmetries and axions  

E-Print Network [OSTI]

We combine two popular extensions of beyond the Standard Model physics within the framework of intersecting D6-brane models: discrete Zn symmetries and Peccei-Quinn axions. The underlying natural connection between both extensions is formed by the presence of massive U(1) gauge symmetries in D-brane model building. Global intersecting D6-brane models on toroidal orbifolds of the type T6/Z2N and T6/Z2xZ2M with discrete torsion offer excellent playgrounds for realizing these extensions. A generation-dependent Z2 symmetry is identified in a global Pati-Salam model, while global left-right symmetric models give rise to supersymmetric realizations of the DFSZ axion model. In one class of the latter models, the axion as well as Standard Model particles carry a non-trivial Z3 charge.

Gabriele Honecker; Wieland Staessens

2015-02-03T23:59:59.000Z

100

Fractional Zaslavsky and Henon Discrete Maps  

E-Print Network [OSTI]

This paper is devoted to the memory of Professor George M. Zaslavsky passed away on November 25, 2008. In the field of discrete maps, George M. Zaslavsky introduced a dissipative standard map which is called now the Zaslavsky map. G. Zaslavsky initialized many fundamental concepts and ideas in the fractional dynamics and kinetics. In this paper, starting from kicked damped equations with derivatives of non-integer orders we derive a fractional generalization of discrete maps. These fractional maps are generalizations of the Zaslavsky map and the Henon map. The main property of the fractional differential equations and the correspondent fractional maps is a long-term memory and dissipation. The memory is realized by the fact that their present state evolution depends on all past states with special forms of weights.

Vasily E. Tarasov

2011-07-26T23:59:59.000Z

Note: This page contains sample records for the topic "discrete atmospheric conditions" 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

A combinatorial approach to discrete geometry  

E-Print Network [OSTI]

We present a paralell approach to discrete geometry: the first one introduces Voronoi cell complexes from statistical tessellations in order to know the mean scalar curvature in term of the mean number of edges of a cell. The second one gives the restriction of a graph from a regular tessellation in order to calculate the curvature from pure combinatorial properties of the graph. Our proposal is based in some epistemological pressupositions: the macroscopic continuous geometry is only a fiction, very usefull for describing phenomena at certain sacales, but it is only an approximation to the true geometry. In the discrete geometry one starts from a set of elements and the relation among them without presuposing space and time as a background.

L. Bombelli; M. Lorente

2005-12-23T23:59:59.000Z

102

DOS: the discrete-ordinates system. [LMFBR  

SciTech Connect (OSTI)

The Discrete Ordinates System determines the flux of neutrons or photons due either to fixed sources specified by the user or to sources generated by particle interaction with the problem materials. It also determines numerous secondary results which depend upon flux. Criticality searches can be performed. Numerous input, output, and file manipulation facilities are provided. The DOS driver program reads the problem specification from an input file and calls various program modules into execution as specified by the input file.

Rhoades, W. A.; Emmett, M. B.

1982-09-01T23:59:59.000Z

103

An essay on discrete foundations for physics  

SciTech Connect (OSTI)

We base our theory of physics and cosmology on the five principles of finiteness, discreteness, finite computability, absolute non- uniqueness, and strict construction. Our modeling methodology starts from the current practice of physics, constructs a self-consistent representation based on the ordering operator calculus and provides rules of correspondence that allow us to test the theory by experiment. We use program universe to construct a growing collection of bit strings whose initial portions (labels) provide the quantum numbers that are conserved in the events defined by the construction. The labels are followed by content strings which are used to construct event-based finite and discrete coordinates. On general grounds such a theory has a limiting velocity, and positions and velocities do not commute. We therefore reconcile quantum mechanics with relativity at an appropriately fundamental stage in the construction. We show that events in different coordinate systems are connected by the appropriate finite and discrete version of the Lorentz transformation, that 3-momentum is conserved in events, and that this conservation law is the same as the requirement that different paths can ''interfere'' only when they differ by an integral number of deBroglie wavelengths. 38 refs., 12 figs., 3 tabs.

Noyes, H.P.; McGoveran, D.O.

1988-10-05T23:59:59.000Z

104

${\\mathbb{Z}}_N$ graded discrete Lax pairs and discrete integrable systems  

E-Print Network [OSTI]

We introduce a class of ${\\mathbb{Z}}_N$ graded discrete Lax pairs, with $N\\times N$ matrices, linear in the spectral parameter. We give a classification scheme for such Lax pairs and the associated discrete integrable systems. We present two potential forms and completely classify the generic case. Many well known examples belong to our scheme for $N=2$, so many of our systems may be regarded as generalisations of these. Even at $N=3$, several new integrable systems arise. Many of our equations are mutually compatible, so can be used together to form "coloured" lattices. We also present continuous isospectral deformations of our Lax pairs, giving compatible differential-difference systems, which play the role of continuous symmetries of our discrete systems. We present master symmetries and a recursive formulae for their respective hierarchies, for the generic case. We present two nonlocal symmetries of our discrete systems, which have a natural representation in terms of the potential forms. These give rise to the two-dimensional Toda lattice, with our nonlinear symmetries being the B\\"acklund transformations and our discrete system being the nonlinear superposition formula (for the generic case).

Allan P. Fordy; Pavlos Xenitidis

2014-11-22T23:59:59.000Z

105

An energy absorbing far-field boundary condition for the elastic wave equation  

SciTech Connect (OSTI)

The authors present an energy absorbing non-reflecting boundary condition of Clayton-Engquist type for the elastic wave equation together with a discretization which is stable for any ratio of compressional to shear wave speed. They prove stability for a second order accurate finite-difference discretization of the elastic wave equation in three space dimensions together with a discretization of the proposed non-reflecting boundary condition. The stability proof is based on a discrete energy estimate and is valid for heterogeneous materials. The proof includes all six boundaries of the computational domain where special discretizations are needed at the edges and corners. The stability proof holds also when a free surface boundary condition is imposed on some sides of the computational domain.

Petersson, N A; Sjogreen, B

2008-07-15T23:59:59.000Z

106

Atmospheric Pollution Research 1 (2010) 220228 Atmospheric Pollution Research  

E-Print Network [OSTI]

Atmospheric Pollution Research 1 (2010) 220228 Atmospheric Pollution Research www in modeling of the associated multiphase processes. Iron redox species are important pollutants. The oxidative capacity of the atmospheric cloud water decreases when dissolution is included

Boyer, Edmond

107

Novel coupling scheme to control dynamics of coupled discrete systems  

E-Print Network [OSTI]

We present a new coupling scheme to control spatio-temporal patterns and chimeras on 1-d and 2-d lattices and random networks of discrete dynamical systems. The scheme involves coupling with an external lattice or network of damped systems. When the system network and external network are set in a feedback loop, the system network can be controlled to a homogeneous steady state or synchronized periodic state with suppression of the chaotic dynamics of the individual units. The control scheme has the advantage that its design does not require any prior information about the system dynamics or its parameters and works effectively for a range of parameters of the control network. We analyze the stability of the controlled steady state or amplitude death state of lattices using the theory of circulant matrices and Routh-Hurwitz's criterion for discrete systems and this helps to isolate regions of effective control in the relevant parameter planes. The conditions thus obtained are found to agree well with those obtained from direct numerical simulations in the specific context of lattices with logistic map and Henon map as on-site system dynamics. We show how chimera states developed in an experimentally realizable 2-d lattice can be controlled using this scheme. We propose this mechanism can provide a phenomenological model for the control of spatio-temporal patterns in coupled neurons due to non-synaptic coupling with the extra cellular medium. We extend the control scheme to regulate dynamics on random networks and adapt the master stability function method to analyze the stability of the controlled state for various topologies and coupling strengths.

Snehal M. Shekatkar; G. Ambika

2014-11-05T23:59:59.000Z

108

Discrete ordinates transport methods for problems with highly forward-peaked scattering  

SciTech Connect (OSTI)

The author examines the solutions of the discrete ordinates (S{sub N}) method for problems with highly forward-peaked scattering kernels. He derives conditions necessary to obtain reasonable solutions in a certain forward-peaked limit, the Fokker-Planck (FP) limit. He also analyzes the acceleration of the iterative solution of such problems and offer improvements to it. He extends the analytic Fokker-Planck limit analysis to the S{sub N} equations. This analysis shows that in this asymptotic limit the S{sub N} solution satisfies a pseudospectral discretization of the FP equation, provided that the scattering term is handled in a certain way (which he describes) and that the analytic transport solution satisfies an analytic FP equation. Similar analyses of various spatially discretized S{sub N} equations reveal that they too produce solutions that satisfy discrete FP equations, given the same provisions. Numerical results agree with these theoretical predictions. He defines a multidimensional angular multigrid (ANMG) method to accelerate the iterative solution of highly forward-peaked problems. The analyses show that a straightforward application of this scheme is subject to high-frequency instabilities. However, by applying a diffusive filter to the ANMG corrections he is able to stabilize this method. Fourier analyses of model problems show that the resulting method is effective at accelerating the convergence rate when the scattering is forward-peaked. The numerical results demonstrate that these analyses are good predictors of the actual performance of the ANMG method.

Pautz, S.D.

1998-04-01T23:59:59.000Z

109

Compartmentalization analysis using discrete fracture network models  

SciTech Connect (OSTI)

This paper illustrates how Discrete Fracture Network (DFN) technology can serve as a basis for the calculation of reservoir engineering parameters for the development of fractured reservoirs. It describes the development of quantitative techniques for defining the geometry and volume of structurally controlled compartments. These techniques are based on a combination of stochastic geometry, computational geometry, and graph theory. The parameters addressed are compartment size, matrix block size and tributary drainage volume. The concept of DFN models is explained and methodologies to compute these parameters are demonstrated.

La Pointe, P.R.; Eiben, T.; Dershowitz, W. [Golder Associates Inc., Redmond, WA (United States); Wadleigh, E. [Marathon Oil Company, Midland, TX (United States). Mid-Continent Region Production

1997-12-31T23:59:59.000Z

110

Compartmentalization analysis using discrete fracture network models  

SciTech Connect (OSTI)

This paper illustrates how Discrete Fracture Network (DFN) technology can serve as a basis for the calculation of reservoir engineering parameters for the development of fractured reservoirs. It describes the development of quantitative techniques for defining the geometry and volume of structurally controlled compartments. These techniques are based on a combination of stochastic geometry, computational geometry, and graph the theory. The parameters addressed are compartment size, matrix block size and tributary drainage volume. The concept of DFN models is explained and methodologies to compute these parameters are demonstrated.

La Pointe, P.R.; Eiben, T.; Dershowitz, W. [Golder Associates, Redmond, VA (United States); Wadleigh, E. [Marathon Oil Co., Midland, TX (United States)

1997-08-01T23:59:59.000Z

111

Unitary Evolution on a Discrete Phase Space  

E-Print Network [OSTI]

We construct unitary evolution operators on a phase space with power of two discretization. These operators realize the metaplectic representation of the modular group SL(2,Z_{2^n}). It acts in a natural way on the coordinates of the non-commutative 2-torus, T_{2^n}^2$ and thus is relevant for non-commutative field theories as well as theories of quantum space-time. The class of operators may also be useful for the efficient realization of new quantum algorithms.

E. G. Floratos; S. Nicolis

2005-10-06T23:59:59.000Z

112

Robustness of discrete-time control systems  

E-Print Network [OSTI]

. The Bilinear Approach s-Plane to z-Plane F. Overbounding and Testing for Stability G. Interlacing Properties of Interval Polynomials Interlacing Property for Continuous- Time Systems Interlacing Property for Discrete- Time Systems Page 26 27 29 33... of p(z) from F(+t) Calculation of s+q Calculation of s~i Calculation of the Minimum Distance of p(z) from P&? Calculation of s Calculation of s Calculation of the Minimum Distance of p(z) from Flsi Calculation of ss Calculation of ss E...

Aguirre, Gabriel

1989-01-01T23:59:59.000Z

113

Modified discrete random walk with absorption  

E-Print Network [OSTI]

We obtain expected number of arrivals, probability of arrival, absorption probabilities and expected time before absorption for a modified discrete random walk on the (sub)set of integers. In a [pqrs] random walk the particle can move one step forward or backward, stay for a moment in the same state or it can be absorbed immediately in the current state. M[pqrs] is a modified version, where probabilities on both sides of a multiple function barrier M are of different [pqrs] type.

Theo van Uem

2009-03-02T23:59:59.000Z

114

Effects of Changing Atmospheric Conditions on Wind Turbine Performance (Poster)  

SciTech Connect (OSTI)

Multi-megawatt, utility-scale wind turbines operate in turbulent and dynamic winds that impact turbine performance in ways that are gradually becoming better understood. This poster presents a study made using a turbulent flow field simulator (TurbSim) and a Turbine aeroelastic simulator (FAST) of the response of a generic 1.5 MW wind turbine to changing inflow. The turbine power output is found to be most sensitive to wind speed and turbulence intensity, but the relationship depends on the wind speed with respect to the turbine's rated wind speed. Shear is found to be poorly correlated to power. A machine learning method called 'regression trees' is used to create a simple model of turbine performance that could be used as part of the wind resource assessment process. This study has used simple flow fields and should be extended to more complex flows, and validated with field observations.

Clifton, A.

2012-12-01T23:59:59.000Z

115

Security Conditions  

Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

This Notice ensures that DOE uniformly meets the requirements of the Homeland Security Advisory System outlined in Homeland Security Presidential Directive-3, Threat Conditions and Associated Protective Measures, dated 3-11-02, and provides responses specified in Presidential Decision Directive 39, U.S. Policy on Counterterrorism (U), dated 6-21-95. It cancels DOE N 473.8, Security Conditions, dated 8-7-02. Extended until 7-7-06 by DOE N 251.64, dated 7-7-05 Cancels DOE N 473.8

2004-07-08T23:59:59.000Z

116

atmospheric aerosol limb: Topics by E-print Network  

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

coefficient is 0.5 and then 1.0 2. For the same conditions calculate the H Weber, Rodney 5 Secondary organic aerosol 1. Atmospheric chemical mechanism for production...

117

atmospheric aerosols recorded: Topics by E-print Network  

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

coefficient is 0.5 and then 1.0 2. For the same conditions calculate the H Weber, Rodney 4 Secondary organic aerosol 1. Atmospheric chemical mechanism for production...

118

atmospheric aerosols relation: Topics by E-print Network  

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

coefficient is 0.5 and then 1.0 2. For the same conditions calculate the H Weber, Rodney 4 Secondary organic aerosol 1. Atmospheric chemical mechanism for production...

119

Condition assessment of nonlinear processes  

DOE Patents [OSTI]

There is presented a reliable technique for measuring condition change in nonlinear data such as brain waves. The nonlinear data is filtered and discretized into windowed data sets. The system dynamics within each data set is represented by a sequence of connected phase-space points, and for each data set a distribution function is derived. New metrics are introduced that evaluate the distance between distribution functions. The metrics are properly renormalized to provide robust and sensitive relative measures of condition change. As an example, these measures can be used on EEG data, to provide timely discrimination between normal, preseizure, seizure, and post-seizure states in epileptic patients. Apparatus utilizing hardware or software to perform the method and provide an indicative output is also disclosed.

Hively, Lee M. (Philadelphia, TN); Gailey, Paul C. (Athens, OH); Protopopescu, Vladimir A. (Knoxville, TN)

2002-01-01T23:59:59.000Z

120

analyzing incomplete discrete: Topics by E-print Network  

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

Geometric Approach to ML Estimation With Incomplete Data: Application to Semi Reilly, James P. 94 Energy Levels of "Hydrogen Atom" in Discrete Time Dynamics Quantum Physics...

Note: This page contains sample records for the topic "discrete atmospheric conditions" 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

A quantitative description of mesh dependence for the discretization ...  

E-Print Network [OSTI]

that coming from a ferromagnetic spin energy. The critical case can be regarded as an interpolation between the two. Key words. spatial discretization, singularly

2012-07-09T23:59:59.000Z

122

Efficient energy stable schemes with spectral discretization in space ...  

E-Print Network [OSTI]

We construct energy stable schemes for the time discretization of the highly nonlinear ... shape) in order to achieve a well-defined energy for the system.

2012-04-03T23:59:59.000Z

123

2-D discrete element modeling of unconsolidated sandstones.  

E-Print Network [OSTI]

??In this work unconsolidated sands saturated with heavy oil were modeled using a discrete element numerical model, (DEM). The DEM code was built in Mathematica… (more)

Franquet Barbara, Javier Alejandro

2012-01-01T23:59:59.000Z

124

attila discrete ordinance: Topics by E-print Network  

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

recurrence satisfied by the Stirling numbers of the second kind. Abrams, Aaron; Hower, Valerie 2010-01-01 428 VARIATIONAL ESTIMATES FOR DISCRETE SCHR Mathematics Websites...

125

attila discrete ordinates: Topics by E-print Network  

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

recurrence satisfied by the Stirling numbers of the second kind. Abrams, Aaron; Hower, Valerie 2010-01-01 428 VARIATIONAL ESTIMATES FOR DISCRETE SCHR Mathematics Websites...

126

The robust stabilization problem for discrete-time descriptor systems  

E-Print Network [OSTI]

Sep 23, 2014 ... Abstract: We investigate the robust stabilization problem for the descriptor discrete-time systems and build an optimal solution in the case when ...

Claudiu Dinicu

2014-09-23T23:59:59.000Z

127

E-Print Network 3.0 - atmospheric moisture budget Sample Search...  

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

-deficient atmospheric column under dry surface conditions. By contrast, under high soil moisture (or energy... , and horizontal and vertical ... Source: Sobel, Adam -...

128

E-Print Network 3.0 - atmospheric moisture content Sample Search...  

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

York Collection: Geosciences 53 Direct and indirect effects of atmospheric conditions and soil moisture on surface energy partitioning revealed by a prolonged drought at a Summary:...

129

Growth Optimal Portfolios in Discrete-time Markets Under Transaction Costs  

E-Print Network [OSTI]

We investigate portfolio selection problem from a signal processing perspective and study how an investor should distribute wealth over two assets in order to maximize the cumulative wealth. We construct portfolios that provide the optimal growth in i.i.d. discrete time two-asset markets under proportional transaction costs. As the market model, we consider arbitrary discrete distributions on the price relative vectors, which can also be used to approximate a wide class of continuous distributions. To achieve optimal growth, we use threshold portfolios, where we introduce a recursive update to calculate the expected wealth. We then demonstrate that under the threshold rebalancing framework, the achievable set of portfolios elegantly form an irreducible Markov chain under mild technical conditions. We evaluate the corresponding stationary distribution of this Markov chain, which provides a natural and efficient method to calculate the cumulative expected wealth. Subsequently, the corresponding parameters are o...

Tunc, Sait; Kozat, Suleyman S

2012-01-01T23:59:59.000Z

130

Dynamics of Atmospheres  

E-Print Network [OSTI]

transfer ­ Solar heating of surface, and atmosphere via dust absorption ­ Infrared CO2 band cooling (especially around 667 cm-1) ­ nonLTE near-infrared heating of CO2 and nonLTE cooling effects above ~60-80 km. Baroclinic waves, scales, heat and momentum transport, seasonal occurrence. Qualitative treatment

Read, Peter L.

131

Dynamics of Planetary Atmospheres  

E-Print Network [OSTI]

pressure (bars) N2 82%; Ar 12%; CH4 6%CO2 96.5%; N2 3.5%Atmospheric composition 26177Orbital inclination (1992) orbiter ­ Winds from cloud-tracking and probe drifts ­ IR temperatures, solar-fixed tides, polar-Huygens mission (from 2005) ­ Doppler wind descent profile ­ IR temperature and composition maps ­ Visible, IR

Read, Peter L.

132

SHAPE MATCHING USING FUZZY DISCRETE PARTICLE SWARM OPTIMIZATION*  

E-Print Network [OSTI]

importantly, the recognition based on shape feature is also a central problem in those fields such as patternSHAPE MATCHING USING FUZZY DISCRETE PARTICLE SWARM OPTIMIZATION* Ji-Xiang Du1, 2 De-Shuang Huang1 based on fuzzy discrete particle swarm optimization (FDPSO) is proposed. Based on fuzzy theory and PSO

Hefei Institute of Intelligent Machines

133

Combined Delta-Nabla Sum Operator in Discrete Fractional Calculus  

E-Print Network [OSTI]

We introduce a more general discrete fractional operator, given by convex linear combination of the delta and nabla fractional sums. Fundamental properties of the new fractional operator are proved. As particular cases, results on delta and nabla discrete fractional calculus are obtained.

Bastos, Nuno R O

2010-01-01T23:59:59.000Z

134

University of Michigan and NBER "Identification of Discrete Choice  

E-Print Network [OSTI]

Presenter: Jeremy Fox University of Michigan and NBER "Identification of Discrete Choice Models;Identification of Discrete Choice Models for Bundles and Binary Games Jeremy T. Fox University of Michigan and NBER Natalia Lazzati University of Michigan March 2014 Abstract We study nonparametric identification

135

Cryptanalysing the Critical Group: Efficiently Solving Biggs's Discrete Logarithm Problem  

E-Print Network [OSTI]

Cryptanalysing the Critical Group: Efficiently Solving Biggs's Discrete Logarithm Problem Simon R Kingdom s.blackburn@rhul.ac.uk November 7, 2008 Abstract Biggs has recently proposed the critical group that the discrete log problem can be efficiently solved in Biggs's groups. Thus this class of groups is not suitable

136

Mechanical Integrators Derived from a Discrete Variational Principle  

E-Print Network [OSTI]

Mechanical Integrators Derived from a Discrete Variational Principle Jerey M. Wendlandt1;2 Mechanical Engineering, University of California at Berkeley, Berkeley, CA 94720, USA Jerrold E. Marsden3 for mechanical system simulation are created by using discrete algorithms to approximate the continuous equations

Marsden, Jerrold

137

Video Denoising and Simplification Via Discrete Regularization on Graphs  

E-Print Network [OSTI]

Video Denoising and Simplification Via Discrete Regularization on Graphs Mahmoud Ghoniem, Youssef algorithms for video de- noising and simplification based on discrete regularization on graphs. The main difference between video and image denoising is the temporal redundancy in video sequences. Recent works

Paris-Sud XI, Université de

138

Incorporating local boundary conditions into nonlocal theories  

E-Print Network [OSTI]

We study nonlocal equations from the area of peridynamics on bounded domains. In our companion paper, we discover that, on $\\mathbb{R}^n$, the governing operator in peridynamics, which involves a convolution, is a bounded function of the classical (local) governing operator. Building on this, we define an abstract convolution operator on bounded domains. The abstract convolution operator is a function of the classical operator, defined by a Hilbert basis available due to the purely discrete spectrum of the latter. As governing operator of the nonlocal equation we use a function of the classical operator, this allows us to incorporate local boundary conditions into nonlocal theories. For the homogeneous wave equation with the considered boundary conditions, we prove that continuity is preserved by time evolution. We give explicit solution expressions for the initial value problems with prominent boundary conditions such as periodic, antiperiodic, Neumann, and Dirichlet. In order to connect to the standard convolution, we give an integral representation of the abstract convolution operator. We present additional "simple" convolutionsbased on periodic and antiperiodic boundary conditions that lead Neumann and Dirichlet boundary conditions. We present a numerical study of the solutions of the wave equation. For discretization, we employ a weak formulation based on a Galerkin projection and use piecewise polynomials on each element which allows discontinuities of the approximate solution at the element borders. We study convergence order of solutions with respect to polynomial order and observe optimal convergence. We depict the solutions for each boundary condition.

Burak Aksoylu; Horst Reinhard Beyer; Fatih Celiker

2014-11-12T23:59:59.000Z

139

Simulated Arctic atmospheric feedbacks associated with late summer sea ice anomalies  

E-Print Network [OSTI]

Simulated Arctic atmospheric feedbacks associated with late summer sea ice anomalies A. Rinke,1,2 K depend on regional and decadal variations in the coupled atmosphere-ocean-sea ice system. Citation: Rinke to investigate feedbacks between September sea ice anomalies in the Arctic and atmospheric conditions in autumn

Moore, John

140

Discrete Exterior Geometry Approach to Structure-Preserving Discretization of Distributed-Parameter Port-Hamiltonian Systems  

E-Print Network [OSTI]

This paper addresses the issue of structure-preserving discretization of open distributed-parameter systems with Hamiltonian dynamics. Employing the formalism of discrete exterior calculus, we introduce a simplicial Dirac structure as a discrete analogue of the Stokes-Dirac structure and demonstrate that it provides a natural framework for deriving finite-dimensional port-Hamiltonian systems that emulate their infinite-dimensional counterparts. The spatial domain, in the continuous theory represented by a finite-dimensional smooth manifold with boundary, is replaced by a homological manifold-like simplicial complex and its augmented circumcentric dual. The smooth differential forms, in discrete setting, are mirrored by cochains on the primal and dual complexes, while the discrete exterior derivative is defined to be the coboundary operator. This approach of discrete differential geometry, rather than discretizing the partial differential equations, allows to first discretize the underlying Stokes-Dirac structure and then to impose the corresponding finite-dimensional port-Hamiltonian dynamics. In this manner, a number of important intrinsically topological and geometrical properties of the system are preserved.

Marko Seslija; Arjan van der Schaft; Jacquelien M. A. Scherpen

2012-02-27T23:59:59.000Z

Note: This page contains sample records for the topic "discrete atmospheric conditions" 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

Differential atmospheric tritium sampler  

DOE Patents [OSTI]

An atmospheric tritium sampler is provided which uses a carrier gas comprised of hydrogen gas and a diluting gas, mixed in a nonexplosive concentration. Sample air and carrier gas are drawn into and mixed in a manifold. A regulator meters the carrier gas flow to the manifold. The air sample/carrier gas mixture is pulled through a first moisture trap which adsorbs water from the air sample. The moisture then passes through a combustion chamber where hydrogen gas in the form of H/sub 2/ or HT is combusted into water. The manufactured water is transported by the air stream to a second moisture trap where it is adsorbed. The air is then discharged back into the atmosphere by means of a pump.

Griesbach, O.A.; Stencel, J.R.

1987-10-02T23:59:59.000Z

142

Differential atmospheric tritium sampler  

DOE Patents [OSTI]

An atmospheric tritium sampler is provided which uses a carrier gas comprised of hydrogen gas and a diluting gas, mixed in a nonexplosive concentration. Sample air and carrier gas are drawn into and mixed in a manifold. A regulator meters the carrier gas flow to the manifold. The air sample/carrier gas mixture is pulled through a first moisture trap which adsorbs water from the air sample. The mixture then passes through a combustion chamber where hydrogen gas in the form of H.sub.2 or HT is combusted into water. The manufactured water is transported by the air stream to a second moisture trap where it is adsorbed. The air is then discharged back into the atmosphere by means of a pump.

Griesbach, Otto A. (Langhorne, PA); Stencel, Joseph R. (Skillman, NJ)

1990-01-01T23:59:59.000Z

143

The changing atmosphere  

SciTech Connect (OSTI)

The chemistry of the atmosphere is changing, in large measure because of gases emitted by such human activities as farming, manufacturing, and the combustion of fossil fuels. The deleterious effects are increasingly evident; they may well become worse in the years ahead. This paper discusses the pollutants and the environmental perturbations with which they are associated. The authors believe the solution to the earth's environmental problems lies in a truly global effort.

Graedel, T.E.; Crutzen, P.J.

1989-09-01T23:59:59.000Z

144

Atmospheric model intercomparison project: Monsoon simulations  

SciTech Connect (OSTI)

The simulation of monsoons, in particular the Indian summer monsoon, has proven to be a critical test of a general circulation model`s ability to simulate tropical climate and variability. The Monsoon Numerical Experimentation Group has begun to address questions regarding the predictability of monsoon extremes, in particular conditions associated with El Nino and La Nina conditions that tend to be associated with drought and flood conditions over the Indian subcontinent, through a series of seasonal integrations using analyzed initial conditions from successive days in 1987 and 1988. In this paper the authors present an analysis of simulations associated with the Atmospheric Model Intercomparison Project (AMIP), a coordinated effort to simulate the 1979--1988 decade using standardized boundary conditions with approximately 30 atmospheric general circulation models. The 13 models analyzed to date are listed. Using monthly mean data from these simulations they have calculated indices of precipitation and wind shear in an effort to access the performance of the models over the course of the AMIP decade.

Sperber, K.R. [Lawrence Livermore National Lab., CA (United States). Program for Climate Model Diagnosis and Intercomparison; Palmer, T.N. [European Centre for Medium-Range Weather Forecasts, Reading (United Kingdom)

1994-06-01T23:59:59.000Z

145

Environmental Chemistry II (Atmospheric Chemistry)  

E-Print Network [OSTI]

Seinfeld, J. H. and Pandis, S. N. Atmospheric Chemistry and Physics: From Air Pollution to Climate ChangeSYLLABUS FOR Environmental Chemistry II (Atmospheric Chemistry) FCH 511 Fall 2013 Theodore S

Dibble, Theodore

146

Pluto's Atmosphere Does Not Collapse  

E-Print Network [OSTI]

Combining stellar occultation observations probing Pluto's atmosphere from 1988 to 2013 and models of energy balance between Pluto's surface and atmosphere, we conclude that Pluto's atmosphere does not collapse at any point in its 248-year orbit. The occultation results show an increasing atmospheric pressure with time in the current epoch, a trend present only in models with a high thermal inertia and a permanent N2 ice cap at Pluto's north rotational pole.

Olkin, C B; Borncamp, D; Pickles, A; Sicardy, B; Assafin, M; Bianco, F B; Buie, M W; de Oliveira, A Dias; Gillon, M; French, R G; Gomes, A Ramos; Jehin, E; Morales, N; Opitom, C; Ortiz, J L; Maury, A; Norbury, M; Ribas, F B; Smith, R; Wasserman, L H; Young, E F; Zacharias, M; Zacharias, N

2013-01-01T23:59:59.000Z

147

Information storage capacity of discrete spin systems  

SciTech Connect (OSTI)

Understanding the limits imposed on information storage capacity of physical systems is a problem of fundamental and practical importance which bridges physics and information science. There is a well-known upper bound on the amount of information that can be stored reliably in a given volume of discrete spin systems which are supported by gapped local Hamiltonians. However, all the previously known systems were far below this theoretical bound, and it remained open whether there exists a gapped spin system that saturates this bound. Here, we present a construction of spin systems which saturate this theoretical limit asymptotically by borrowing an idea from fractal properties arising in the Sierpinski triangle. Our construction provides not only the best classical error-correcting code which is physically realizable as the energy ground space of gapped frustration-free Hamiltonians, but also a new research avenue for correlated spin phases with fractal spin configurations. -- Highlights: •We propose a spin model with fractal ground states and study its coding properties. •We show that the model asymptotically saturates a theoretical limit on information storage capacity. •We discuss its relations to various theoretical physics problems.

Yoshida, Beni, E-mail: rouge@caltech.edu

2013-11-15T23:59:59.000Z

148

SNAP:SN (Discrete Ordinates) Application Proxy  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 -the Mid-Infrared0 ResourceAwards SAGE Awards ,#2446Small AngleFinalRates

149

ON THE STABILITY OF SUPER-EARTH ATMOSPHERES  

SciTech Connect (OSTI)

We investigate the stability of super-Earth atmospheres around M stars using a seven-parameter, analytical framework. We construct stability diagrams in the parameter space of exoplanetary radius versus semimajor axis and elucidate the regions in which the atmospheres are stable against the condensation of their major constituents, out of the gas phase, on their permanent nightside hemispheres. We find that super-Earth atmospheres that are nitrogen-dominated (Earth-like) occupy a smaller region of allowed parameter space, compared to hydrogen-dominated atmospheres, because of the dual effects of diminished advection and enhanced radiative cooling. Furthermore, some super-Earths which reside within the habitable zones of M stars may not possess stable atmospheres, depending on the mean molecular weight and infrared photospheric pressure of their atmospheres. We apply our stability diagrams to GJ 436b and GJ 1214b, and demonstrate that atmospheric compositions with high mean molecular weights are disfavored if these exoplanets possess solid surfaces and shallow atmospheres. Finally, we construct stability diagrams tailored to the Kepler data set, for G and K stars, and predict that about half of the exoplanet candidates are expected to harbor stable atmospheres if Earth-like conditions are assumed. We include 55 Cancri e and CoRoT-7b in our stability diagram for G stars.

Heng, Kevin [ETH Zuerich, Institute for Astronomy, Wolfgang-Pauli-Strasse 27, CH-8093, Zuerich (Switzerland); Kopparla, Pushkar [ETH Zuerich, Institute for Atmospheric and Climate Science, Universitaetstrasse 16, CH-8092, Zuerich (Switzerland)

2012-07-20T23:59:59.000Z

150

Multidimensional electron-photon transport with standard discrete ordinates codes  

SciTech Connect (OSTI)

A method is described for generating electron cross sections that are compatible with standard discrete ordinates codes without modification. There are many advantages of using an established discrete ordinates solver, e.g. immediately available adjoint capability. Coupled electron-photon transport capability is needed for many applications, including the modeling of the response of electronics components to space and man-made radiation environments. The cross sections have been successfully used in the DORT, TWODANT and TORT discrete ordinates codes. The cross sections are shown to provide accurate and efficient solutions to certain multidimensional electronphoton transport problems.

Drumm, C.R.

1995-12-31T23:59:59.000Z

151

An efficient permeability scaling-up technique applied to the discretized flow equations  

SciTech Connect (OSTI)

Grid-block permeability scaling-up for numerical reservoir simulations has been discussed for a long time in the literature. It is now recognized that a full permeability tensor is needed to get an accurate reservoir description at large scale. However, two major difficulties are encountered: (1) grid-block permeability cannot be properly defined because it depends on boundary conditions; (2) discretization of flow equations with a full permeability tensor is not straightforward and little work has been done on this subject. In this paper, we propose a new method, which allows us to get around both difficulties. As the two major problems are closely related, a global approach will preserve the accuracy. So, in the proposed method, the permeability up-scaling technique is integrated in the discretized numerical scheme for flow simulation. The permeability is scaled-up via the transmissibility term, in accordance with the fluid flow calculation in the numerical scheme. A finite-volume scheme is particularly studied, and the transmissibility scaling-up technique for this scheme is presented. Some numerical examples are tested for flow simulation. This new method is compared with some published numerical schemes for full permeability tensor discretization where the full permeability tensor is scaled-up through various techniques. Comparing the results with fine grid simulations shows that the new method is more accurate and more efficient.

Urgelli, D.; Ding, Yu [Institut Francais du Petrole, Rueil Malmaison (France)

1997-08-01T23:59:59.000Z

152

Atmospheric Aerosol Systems | EMSL  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary)morphinanInformation InInformationCenterResearch HighlightsTools PrintableCARIBU ProposalBeamAtmospheric

153

Atmospheric Radiation Measurement Program  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth (AOD)ProductssondeadjustsondeadjustAbout theOFFICEAmesApplication2ArgonneAssemblyDemandPlasma4August 1999 ARM

154

Atmospheric Radiation Measurement Program  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth (AOD)ProductssondeadjustsondeadjustAbout theOFFICEAmesApplication2ArgonneAssemblyDemandPlasma4August 1999

155

Atmospheric Radiation Measurement Program  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth (AOD)ProductssondeadjustsondeadjustAbout theOFFICEAmesApplication2ArgonneAssemblyDemandPlasma4August 1999July

156

Atmospheric Radiation Measurement Program  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth (AOD)ProductssondeadjustsondeadjustAbout theOFFICEAmesApplication2ArgonneAssemblyDemandPlasma4August

157

Atmospheric Radiation Measurement Program  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth (AOD)ProductssondeadjustsondeadjustAbout theOFFICEAmesApplication2ArgonneAssemblyDemandPlasma4August3 ARM 2003

158

Atmospheric Particulates | EMSL  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsruc DocumentationP-Series to someone byDear Friend,Arthur J. Nozik -GrownAn overheadAtmospheric

159

A Model of Intra-seasonal Oscillations in the Earth atmosphere  

E-Print Network [OSTI]

We suggest a way of rationalizing an intra-seasonal oscillations (IOs) of the Earth atmospheric flow as four meteorological relevant triads of interacting planetary waves, isolated from the system of all the rest planetary waves. Our model is independent of the topography (mountains, etc.) and gives a natural explanation of IOs both in the North and South Hemispheres. Spherical planetary waves are an example of a wave mesoscopic system obeying discrete resonances that also appears in other areas of physics.

Elena Kartashova; Victor S. L'vov

2007-04-04T23:59:59.000Z

160

Determining the significance of associations between two series of discrete events : bootstrap methods /  

SciTech Connect (OSTI)

We review and develop techniques to determine associations between series of discrete events. The bootstrap, a nonparametric statistical method, allows the determination of the significance of associations with minimal assumptions about the underlying processes. We find the key requirement for this method: one of the series must be widely spaced in time to guarantee the theoretical applicability of the bootstrap. If this condition is met, the calculated significance passes a reasonableness test. We conclude with some potential future extensions and caveats on the applicability of these methods. The techniques presented have been implemented in a Python-based software toolkit.

Niehof, Jonathan T.; Morley, Steven K.

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "discrete atmospheric conditions" 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

Methane present in an extrasolar planet atmosphere  

E-Print Network [OSTI]

Molecules present in exoplanetary atmospheres are expected to strongly influence the atmospheric radiation balance, trace dynamical and chemical processes, and indicate the presence of disequilibrium effects. Since molecules have the potential to reveal the exoplanet atmospheric conditions and chemistry, searching for them is a high priority. The rotational-vibrational transition bands of water, carbon monoxide, and methane are anticipated to be the primary sources of non-continuum opacity in hot-Jovian planets. Since these bands overlap in wavelength, and the corresponding signatures from them are weak, decisive identification requires precision infrared spectroscopy. Here we report on a near-infrared transmission spectrum of the planet HD 189733b showing the presence of methane. Additionally, a resolved water-vapour band at 1.9 microns confirms the recent claim of water in this object. On thermochemical grounds, carbon-monoxide is expected to be abundant in the upper atmosphere of hot-Jovian exoplanets; thus the detection of methane rather than carbon-monoxide in such a hot planet could signal the presence of a horizontal chemical gradient away from the permanent dayside, or it may imply an ill-understood photochemical mechanisms that leads to an enhancement of methane.

Mark R. Swain; Gautam Vasisht; Giovanna Tinetti

2008-02-07T23:59:59.000Z

162

Infrared Spectroscopy of Discrete Uranyl Anion Complexes  

SciTech Connect (OSTI)

The Free-Electron Laser for Infrared Experiments, FELIX, was used to study the wavelength-resolved multiphoton dissociation of discrete, gas phase uranyl (UO22+) complexes containing a single anionic ligand (A), with or without ligated solvent molecules (S). The apparent uranyl antisymmetric and symmetric stretching frequencies were measured for complexes with general formula [UO2A(S)n]+, where A was either hydroxide, methoxide or acetate, S was water, ammonia, acetone or acetonitrile, and n = 0-2. The values for the antisymmetric stretching frequency for uranyl ligated with only an anion ([UO2A]+) were as low or lower than measurements for [UO2]2+ ligated with as many as five strong neutral donor ligands, and are comparable to solution phase values. This result was surprising because initial DFT calculations using B3LYP predicted values that were 30 – 40 cm-1 higher, consistent with intuition but not with the data. Modification of the basis set and use of alternative functionals improved computational accuracy for the methoxide and acetate complexes, but calculated values for the hydroxide were greater than the measurement regardless of the computational method used. Attachment of a neutral donor ligand S to [UO2A]+ produced [UO2AS]+, which resulted only very modest changes to the uranyl frequency, and did not universally shift values lower. DFT calculations for [UO2AS]+ were in accord with trends in the data, and showed that attachment of the solvent was accommodated by weakening of the U-anion bond as well as the uranyl. When uranyl frequencies were compared for [UO2AS]+ species having different solvent neutrals, values decreased with increasing neutral nucleophilicity.

Gary S. Groenewold; Anita K. Gianotto; Michael E. McIlwain; Michael J. Van Stipdonk; Michael Kullman; Travis J. Cooper; David T. Moore; Nick Polfer; Jos Oomens; Ivan Infante; Lucas Visscher; Bertrand Siboulet; Wibe A. de Jong

2007-12-01T23:59:59.000Z

163

Infared Spectroscopy of Discrete Uranyl Anion Complexes  

SciTech Connect (OSTI)

The Free-Electron Laser for Infrared Experiments (FELIX) w 1 as used to study the wavelength-resolved multiple photon photodissociation of discrete, gas phase uranyl (UO2 2 2+) complexes containing a single anionic ligand (A), with or without ligated solvent molecules (S). The uranyl antisymmetric and symmetric stretching frequencies were measured for complexes with general formula [UO2A(S)n]+, where A was either hydroxide, methoxide, or acetate; S was water, ammonia, acetone, or acetonitrile; and n = 0-3. The values for the antisymmetric stretching frequency for uranyl ligated with only an anion ([UO2A]+) were as low or lower than measurements for [UO2]2+ ligated with as many as five strong neutral donor ligands, and are comparable to solution phase values. This result was surprising because initial DFT calculations predicted values that were 30–40 cm-1 higher, consistent with intuition but not with the data. Modification of the basis sets and use of alternative functionals improved computational accuracy for the methoxide and acetate complexes, but calculated values for the hydroxide were greater than the measurement regardless of the computational method used. Attachment of a neutral donor ligand S to [UO2A]+ produced [UO2AS]+, which produced only very modest changes to the uranyl antisymmetric stretch frequency, and did not universally shift the frequency to lower values. DFT calculations for [UO2AS]+ were in accord with trends in the data, and showed that attachment of the solvent was accommodated by weakening of the U-anion bond as well as the uranyl. When uranyl frequencies were compared for [UO2AS]+ species having different solvent neutrals, values decreased with increasing neutral nucleophilicity.

Groenewold, G. S.; Gianotto, Anita K.; McIIwain, Michael E.; Van Stipdonk, Michael J.; Kullman, Michael; Moore, David T.; Polfer, Nick; Oomens, Jos; Infante, Ivan A.; Visscher, Lucas; Siboulet, Bertrand; De Jong, Wibe A.

2008-01-24T23:59:59.000Z

164

2-D discrete element modeling of unconsolidated sandstones  

E-Print Network [OSTI]

developed in this thesis is compared to the results of triaxial tests performed in cylindrical core samples of unconsolidated sandstones saturated with heavy oil. The discrete element model treats the sand as a two dimensional assembly of particles...

Franquet Barbara, Javier Alejandro

2012-06-07T23:59:59.000Z

165

A piecewise linear finite element discretization of the diffusion equation  

E-Print Network [OSTI]

it discretizes the diffusion equation on an arbitrary polyhedral mesh. We implemented our method in the KULL software package being developed at Lawrence Livermore National Laboratory. This code previously utilized Palmer's method as its diffusion solver, which...

Bailey, Teresa S

2006-10-30T23:59:59.000Z

166

Optimization With Parity Constraints: From Binary Codes to Discrete Integration  

E-Print Network [OSTI]

Optimization With Parity Constraints: From Binary Codes to Discrete Integration Stefano Ermon guarantees on the quality of the solution found. Markov Chain Monte Carlo [17, 21, 32] and Importance

Bejerano, Gill

167

Embed and Project: Discrete Sampling with Universal Hashing  

E-Print Network [OSTI]

Embed and Project: Discrete Sampling with Universal Hashing Stefano Ermon, Carla P. Gomes Dept Markov Chain Monte Carlo (MCMC) methods. MCMC techniques are a specialized form of local search that only

Bejerano, Gill

168

Analysis of steel silo structures on discrete supports   

E-Print Network [OSTI]

The objective of this thesis is to broaden current knowledge of the strength and buckling/collapse of shells, with special reference to steel silo structures on discrete supports, and thus to provide design guidance of ...

Li, Hongyu

169

Resolution of grain scale interactions using the Discrete Element Method  

E-Print Network [OSTI]

Granular materials are an integral part of many engineering systems. Currently, a popular tool for numerically investigating granular systems is the Discrete Element Method (DEM). Nearly all implementations of the DEM, ...

Johnson, Scott M. (Scott Matthew), 1978-

2006-01-01T23:59:59.000Z

170

Discrete Feature Approach for Heterogeneous Reservoir Production Enhancement  

SciTech Connect (OSTI)

The report presents summaries of technology development for discrete feature modeling in support of the improved oil recovery (IOR) for heterogeneous reservoirs. In addition, the report describes the demonstration of these technologies at project study sites.

Dershowitz, William S.; Curran, Brendan; Einstein, Herbert; LaPointe, Paul; Shuttle, Dawn; Klise, Kate

2002-07-26T23:59:59.000Z

171

Isolation of Discrete Nanoparticle-DNA Conjugates for Plasmonic Applications  

SciTech Connect (OSTI)

Discrete DNA-gold nanoparticle conjugates with DNA lengths as short as 15 bases for both 5 nm and 20 nm gold particles have been purified by anion-exchange HPLC. Conjugates comprising short DNA (<40 bases) and large gold particles (>_ 20 nm) are difficult to purify by other means, and are potential substrates for plasmon coupling experiments. Conjugate purity is demonstrated by hybridizing complementary conjugates to form discrete structures, which are visualized by TEM.

Alivisatos, Paul; Claridge, Shelley A.; Liang, Huiyang W.; Basu, Sourav Roger; Frechet, Jean M.J.; Alivisatos, A. Paul

2008-04-11T23:59:59.000Z

172

Direct measurement of yield stress of discrete materials  

E-Print Network [OSTI]

We present a novel computational method for direct measurement of yield stress of discrete materials. The method is well-suited for the measurement of jamming phase diagram of a wide range of discrete particle systems such as granular materials, foams, and colloids. We further successfully apply the method to evaluate the jamming phase diagram of wet granular material in order to demonstrates the applicability of the model.

S. H. Ebrahimnazhad Rahbari; J. Vollmer; S. Herminghaus; M. Brinkmann

2012-06-09T23:59:59.000Z

173

Hamilton Operators, Discrete Symmetries, Brute Force and SymbolicC++  

E-Print Network [OSTI]

To find the discrete symmetries of a Hamilton operator $\\hat H$ is of central importance in quantum theory. Here we describe and implement a brute force method to determine the discrete symmetries given by permutation matrices for Hamilton operators acting in a finite-dimensional Hilbert space. Spin and Fermi systems are considered as examples. A computer algebra implementation in SymbolicC++ is provided.

Willi-Hans Steeb; Yorick Hardy

2012-08-23T23:59:59.000Z

174

Fractional Equations of Kicked Systems and Discrete Maps  

E-Print Network [OSTI]

Starting from kicked equations of motion with derivatives of non-integer orders, we obtain "fractional" discrete maps. These maps are generalizations of well-known universal, standard, dissipative, kicked damped rotator maps. The main property of the suggested fractional maps is a long-term memory. The memory effects in the fractional discrete maps mean that their present state evolution depends on all past states with special forms of weights. These forms are represented by combinations of power-law functions.

Vasily E. Tarasov; George M. Zaslavsky

2011-07-20T23:59:59.000Z

175

No-Arbitrage Pricing for Dividend-Paying Securities in Discrete-Time Markets with Transaction Costs  

E-Print Network [OSTI]

We prove a version of First Fundamental Theorem of Asset Pricing under transaction costs for discrete-time markets with dividend-paying securities. Specifically, we show that the no-arbitrage condition under the efficient friction assumption is equivalent to the existence of a risk-neutral measure. We derive dual representations for the superhedging ask and subhedging bid price processes of a derivative contract. Our results are illustrated with a vanilla credit default swap contract.

Bielecki, Tomasz R; Rodriguez, Rodrigo

2012-01-01T23:59:59.000Z

176

Atmospheric propagation of THz radiation.  

SciTech Connect (OSTI)

In this investigation, we conduct a literature study of the best experimental and theoretical data available for thin and thick atmospheres on THz radiation propagation from 0.1 to 10 THz. We determined that for thick atmospheres no data exists beyond 450 GHz. For thin atmospheres data exists from 0.35 to 1.2 THz. We were successful in using FASE code with the HITRAN database to simulate the THz transmission spectrum for Mauna Kea from 0.1 to 2 THz. Lastly, we successfully measured the THz transmission spectra of laboratory atmospheres at relative humidities of 18 and 27%. In general, we found that an increase in the water content of the atmosphere led to a decrease in the THz transmission. We identified two potential windows in an Albuquerque atmosphere for THz propagation which were the regions from 1.2 to 1.4 THz and 1.4 to 1.6 THz.

Wanke, Michael Clement; Mangan, Michael A.; Foltynowicz, Robert J.

2005-11-01T23:59:59.000Z

177

ATMOSPHERIC ELSEVIER AtmosphericResearch 44 (1997) 231-241  

E-Print Network [OSTI]

ATMOSPHERIC RESEARCH ELSEVIER AtmosphericResearch 44 (1997) 231-241 Error analysis of backscatter;accepted 14 February 1997 Abstract Ice sphere backscatter has been calculated using both Mie theory as a reasonable approximation for rv 1997 Elsevier Science B.V. 1. Introduction Cirrus clouds play

Reading, University of

178

ELSEVIER AtmosphericResearch 38 (1995) 207-235 ATMOSPHERIC  

E-Print Network [OSTI]

ELSEVIER AtmosphericResearch 38 (1995) 207-235 ATMOSPHERIC RESEARCH On the parameterization of ice and water substance mixing ratio fields were only strongly altered by turning off the ice phase of these schemes includes ice processes. But in mid- latitudes and also in tropics the ice phase is an important

Moelders, Nicole

179

7.10 MATLAB Experiment on Discrete-Time Systems Purpose: In this experiment, we analyze time responses of a higher-order linear discrete-  

E-Print Network [OSTI]

7.10 MATLAB Experiment on Discrete-Time Systems Purpose: In this experiment, we analyze time responses of a higher-order linear discrete- time system using MATLAB. We study system impulse, step-time dynamic systems using MATLAB. Consider the linear discrete-time system

Gajic, Zoran

180

Anomalous discrete chiral symmetry in the Gross-Neveu model and loop gas simulations  

E-Print Network [OSTI]

We investigate the discrete chiral transformation of a Majorana fermion on a torus. Depending on the boundary conditions the integration measure can change sign. Taking this anomalous behavior into account we define a chiral order parameter as a ratio of partition functions with differing boundary conditions. Then the lattice realization of the Gross-Neveu model with Wilson fermions is simulated using the recent `worm' technique on the loop gas or all-order hopping representation of the fermions. An algorithm is formulated that includes the Gross-Neveu interaction for N fermion species. The critical line m_c(g) is constructed for a range of couplings at N = 6 and for N = 2, the Thirring model, as examples.

Oliver Bär; Willi Rath; Ulli Wolff

2009-05-27T23:59:59.000Z

Note: This page contains sample records for the topic "discrete atmospheric conditions" 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

Polyport atmospheric gas sampler  

DOE Patents [OSTI]

An atmospheric gas sampler with a multi-port valve which allows for multi, sequential sampling of air through a plurality of gas sampling tubes mounted in corresponding gas inlet ports. The gas sampler comprises a flow-through housing which defines a sampling chamber and includes a gas outlet port to accommodate a flow of gases through the housing. An apertured sample support plate defining the inlet ports extends across and encloses the sampling chamber and supports gas sampling tubes which depend into the sampling chamber and are secured across each of the inlet ports of the sample support plate in a flow-through relation to the flow of gases through the housing during sampling operations. A normally closed stopper means mounted on the sample support plate and operatively associated with each of the inlet ports blocks the flow of gases through the respective gas sampling tubes. A camming mechanism mounted on the sample support plate is adapted to rotate under and selectively lift open the stopper spring to accommodate a predetermined flow of gas through the respective gas sampling tubes when air is drawn from the housing through the outlet port.

Guggenheim, S. Frederic (Teaneck, NJ)

1995-01-01T23:59:59.000Z

182

DOE research on atmospheric aerosols  

SciTech Connect (OSTI)

Atmospheric aerosols are the subject of a significant component of research within DOE`s environmental research activities, mainly under two programs within the Department`s Environmental Sciences Division, the Atmospheric Radiation Measurement (ARM) Program and the Atmospheric Chemistry Program (ACP). Research activities conducted under these programs include laboratory experiments, field measurements, and theoretical and modeling studies. The objectives and scope of these programs are briefly summarized. The ARM Program is the Department`s major research activity focusing on atmospheric processes pertinent to understanding global climate and developing the capability of predicting global climate change in response to energy related activities. The ARM approach consists mainly of testing and improving models using long-term measurements of atmospheric radiation and controlling variables at highly instrumented sites in north central Oklahoma, in the Tropical Western Pacific, and on the North Slope of Alaska. Atmospheric chemistry research within DOE addresses primarily the issue of atmospheric response to emissions from energy-generation sources. As such this program deals with the broad topic known commonly as the atmospheric source-receptor sequence. This sequence consists of all aspects of energy-related pollutants from the time they are emitted from their sources to the time they are redeposited at the Earth`s surface.

Schwartz, S.E.

1995-11-01T23:59:59.000Z

183

Space Science : Atmosphere Greenhouse Effect  

E-Print Network [OSTI]

Space Science : Atmosphere Greenhouse Effect Part-5a Solar + Earth Spectrum IR Absorbers Grey Atmosphere Greenhouse Effect #12;Radiation: Solar and Earth Surface B"(T) Planck Ideal Emission Integrate at the carbon cycle #12;However, #12;Greenhouse Effect is Complex #12;PLANETARY ENERGY BALANCE G+W fig 3-5

Johnson, Robert E.

184

Discrete canonical analysis of three dimensional gravity with cosmological constant  

E-Print Network [OSTI]

We discuss the interplay between standard canonical analysis and canonical discretization in three-dimensional gravity with cosmological constant. By using the Hamiltonian analysis, we find that the continuum local symmetries of the theory are given by the on-shell space-time diffeomorphisms, which at the action level, corresponds to the Kalb-Ramond transformations. At the time of discretization, although this symmetry is explicitly broken, we prove that the theory still preserves certain gauge freedom generated by a constant curvature relation in terms of holonomies and the Gauss's law in the lattice approach.

J. Berra-Montiel; J. E. Rosales-Quintero

2014-06-03T23:59:59.000Z

185

Discrete Intrinsic Redshifts from Quasars to Normal Galaxies  

E-Print Network [OSTI]

It is pointed out that the discrete velocities found by Tifft in galaxies are harmonically related to the discrete intrinsic redshifts found in quasars. All are harmonically related to the constant 0.062 +/- 0.001, and this is the fourth independent analysis in which the redshift increment 0.062 has been shown to be significant. It is concluded that there is a quantized component in the redshift of both quasars and galaxies that has a common origin and is unlikely to be Doppler-related.

M. B. Bell

2002-11-05T23:59:59.000Z

186

Discrete KP equation with self-consistent sources  

E-Print Network [OSTI]

We show that the discrete Kadomtsev-Petviashvili (KP) equation with sources obtained recently by the "source generalization" method can be incorporated into the squared eigenfunction symmetry extension procedure. Moreover, using the known correspondence between Darboux-type transformations and additional independent variables, we demonstrate that the equation with sources can be derived from Hirota's discrete KP equations but in a space of higher dimension. In this way we uncover the origin of the source terms as coming from multidimensional consistency of the Hirota system itself.

Adam Doliwa; Runliang Lin

2014-04-05T23:59:59.000Z

187

Discrete symmetry in graphene: the Dirac equation and beyond  

E-Print Network [OSTI]

In this pedagogical paper we review the discrete symmetries of the Dirac equation using elementary tools, but in a comparative order: the usual 3 + 1 dimensional case and the 2 + 1 dimensional case. Motivated by new applications of the 2d Dirac equation in condensed matter, we further analyze the discrete symmetries of a full tight-binding model in hexagonal lattices without conical approximations. We touch upon an effective CPT symmetry breaking that occurs when deformations and second-neighbor corrections are considered.

Sadurní, Emerson; Rosado, Alfonso

2014-01-01T23:59:59.000Z

188

Methodology for characterizing modeling and discretization uncertainties in computational simulation  

SciTech Connect (OSTI)

This research effort focuses on methodology for quantifying the effects of model uncertainty and discretization error on computational modeling and simulation. The work is directed towards developing methodologies which treat model form assumptions within an overall framework for uncertainty quantification, for the purpose of developing estimates of total prediction uncertainty. The present effort consists of work in three areas: framework development for sources of uncertainty and error in the modeling and simulation process which impact model structure; model uncertainty assessment and propagation through Bayesian inference methods; and discretization error estimation within the context of non-deterministic analysis.

ALVIN,KENNETH F.; OBERKAMPF,WILLIAM L.; RUTHERFORD,BRIAN M.; DIEGERT,KATHLEEN V.

2000-03-01T23:59:59.000Z

189

Oddelek za ziko Normal modes in the atmosphere  

E-Print Network [OSTI]

weather prediction. In section 3 I concentrate on the normal modes of a very simple model, shallow water #12;Numerical weather prediction is an initial condition problem. That means we need ini- tial-gravity waves just play their role, but in numerical models of the atmosphere, they can cause huge problems. 1

Â?umer, Slobodan

190

Turbulent heat transfer and friction in a square channel with discrete rib turbulators  

E-Print Network [OSTI]

in which two opposite walls are roughened with parallel and crossed arrays of full ribs, cross-cut discrete ribs, and beveled discrete ribs. The discrete ribs are staggered in alternate rows of three and two ribs The rib-roughened channel models..., 000 and 80, 000. Results are also obtained for parallel arrays of cross-cut discrete ribs with a = 45 and ? 45' on alternate rows. Both parallel angled cross-cut and beveled discrete ribs are superior to 90" discrete ribs and corresponding parallel...

McMillin, Robert Dale

1989-01-01T23:59:59.000Z

191

Wave-packet continuum discretization for quantum scattering  

E-Print Network [OSTI]

A general approach to a solution of few- and many-body scattering problems based on a continuum-discretization procedure is described in detail. The complete discretization of continuous spectrum is realized using stationary wave packets which are the normalized states constructed from exact non-normalized continuum states. Projecting the wave functions and all scattering operators like $t$-matrix, resolvent, etc. on such a wave-packet basis results in a formulation of quantum scattering problem entirely in terms of discrete elements and linear equations with regular matrices. It is demonstrated that there is a close relation between the above stationary wave packets and pseudostates which are employed often to approximate the scattering states with a finite $L_2$ basis. Such a fully discrete treatment of complicated few- and many-body scattering problems leads to significant simplification of their practical solution. Also we get finite-dimensional approximations for complicated operators like effective interactions between composite particles constructed via the Feshbach-type projection formalism. As illustrations to this general approach we consider several important particular problems including multichannel scattering and scattering in the three-nucleon system within the Faddeev framework.

O. A. Rubtsova; V. I. Kukulin; V. N. Pomerantsev

2015-01-15T23:59:59.000Z

192

Discrete Mathematics 110 (1992) 43-59 North-Holland  

E-Print Network [OSTI]

' or `combine' de Bruijn cycles? (vii) What are the analogues for larger alphabets (k symbols rather than 2Discrete Mathematics 110 (1992) 43-59 North-Holland 43 Universal structures Fan Chung cycles Revised 12 April 1991 Abstract Chung, F., P. Diaconis and R. Graham, Universal cycles for combinatorial

Diaconis, Persi

193

Discrete Ordinate Method for Solving Inhomogeneous Vector Radiative Transfer Equation  

E-Print Network [OSTI]

paper.. This type of equation appears when modeling radiative transport in plane parallel media. WeDiscrete Ordinate Method for Solving Inhomogeneous Vector Radiative Transfer Equation We describe here a solution method for equations of the type given by: µ I(,µ) +I(,µ)- () 2 1 -1 Z(,µ,µ )I(,µ )dµ

Pattanaik, Sumanta N.

194

Sparse Twisted Tensor Frame Discretization Parametric Transport Operators  

E-Print Network [OSTI]

Parametric, high-dimensional transport Equations such as Vlasov-Poisson, Boltzmann and Radiative Transfer associated with the transport equation and by subsequent Galerkin discretization with a novel, sparse tensor of the phase space. In [22], for a model parametric transport problem arising in radiative transport, the use

Grohs, Philipp

195

Two samples test for discrete power-law distributions  

E-Print Network [OSTI]

Power-law distributions occur in wide variety of physical, biological, and social phenomena. In this paper, we propose a statistical hypothesis test based on the log-likelihood ratio to assess whether two samples of discrete data are drawn from the same power-law distribution.

Bessi, Alessandro

2015-01-01T23:59:59.000Z

196

Continuous-Time Distributed Observers with Discrete Communication  

E-Print Network [OSTI]

Continuous-Time Distributed Observers with Discrete Communication Florian D¨orfler, Fabio-permissions@ieee.org. This material is based upon work supported by NSF grants IIS-0904501 and CPS-1135819. Florian D¨orfler, Fabio, University of California, Santa Barbara, {dorfler,fabiopas,bullo}@engineering.ucsb.edu Distributed observers

Bullo, Francesco

197

Physics in discrete spaces (A): Space-Time organization  

E-Print Network [OSTI]

We put forward a model of discrete physical space that can account for the structure of space- time, give an interpretation to the postulates of quantum mechanics and provide a possible explanation to the organization of the standard model of particles.

P. Peretto

2010-12-29T23:59:59.000Z

198

Topological horseshoes in travelling waves of discretized nonlinear wave equations  

SciTech Connect (OSTI)

Applying the concept of anti-integrable limit to coupled map lattices originated from space-time discretized nonlinear wave equations, we show that there exist topological horseshoes in the phase space formed by the initial states of travelling wave solutions. In particular, the coupled map lattices display spatio-temporal chaos on the horseshoes.

Chen, Yi-Chiuan, E-mail: YCChen@math.sinica.edu.tw [Institute of Mathematics, Academia Sinica, Taipei 10617, Taiwan (China)] [Institute of Mathematics, Academia Sinica, Taipei 10617, Taiwan (China); Chen, Shyan-Shiou, E-mail: sschen@ntnu.edu.tw [Department of Mathematics, National Taiwan Normal University, Taipei 11677, Taiwan (China)] [Department of Mathematics, National Taiwan Normal University, Taipei 11677, Taiwan (China); Yuan, Juan-Ming, E-mail: jmyuan@pu.edu.tw [Department of Financial and Computational Mathematics, Providence University, Shalu, Taichung 43301, Taiwan (China)] [Department of Financial and Computational Mathematics, Providence University, Shalu, Taichung 43301, Taiwan (China)

2014-04-15T23:59:59.000Z

199

Time-Variant Channel Equalization via Discrete Prolate Spheroidal Sequences  

E-Print Network [OSTI]

are processed by an inverse discrete Fourier transform (DFT) to obtain an orthogonal frequency division Devices department (RCD), part of the Siemens AG Austria, Program and System Engineering (PSE) and the Telecommunications Research Center Vienna (ftw.) in the I0 project. Thomas Zemen was with Siemens AG Austria when he

Zemen, Thomas

200

Discrete geodesic regression in shape space Benjamin Berkels1  

E-Print Network [OSTI]

Discrete geodesic regression in shape space Benjamin Berkels1 , P. Thomas Fletcher2 , Behrend Benedikt.Wirth@cims.nyu.edu Abstract. A new approach for the effective computation of geodesic re- gression curves in shape spaces is presented. Here, one asks for a geodesic curve on the shape manifold

Rumpf, Martin

Note: This page contains sample records for the topic "discrete atmospheric conditions" 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

Discrete wave turbulence of rotational capillary water waves  

E-Print Network [OSTI]

We study the discrete wave turbulent regime of capillary water waves with constant non-zero vorticity. The explicit Hamiltonian formulation and the corresponding coupling coefficient are obtained. We also present the construction and investigation of resonance clustering. Some physical implications of the obtained results are discussed.

Adrian Constantin; Elena Kartashova; Erik Wahlén

2010-05-12T23:59:59.000Z

202

Power Control for Discrete-Input Block-Fading Channels  

E-Print Network [OSTI]

. K. Rasmussen CUED / F-INFENG / TR 582 August 2007 #12;#12;1 Power Control for Discrete-Input Block-Fading Channels Khoa D. Nguyen, Albert Guill´en i F`abregas and Lars K. Rasmussen Abstract We consider power systems employing orthogonal frequency division multiplexing. K. D. Nguyen and L. K. Rasmussen

Guillén i Fàbregas, Albert

203

Simulation on Discrete Fracture Network Using Flexible Voronoi Gridding  

E-Print Network [OSTI]

........................................... 3 1.2.2 Gridding Techniques ............................................................. 4 1.2.2.1 Globally Orthogonal Grid ...................................... 5 1.2.2.2 Corner Point Grid... ................................................... 5 1.2.3 Locally Orthogonal Grid ....................................................... 6 1.3 Introduction to Discrete Fracture Network Simulation ................... 7 1.4 Introduction to Fracture Aperture Measurement Using X-Ray CT...

Syihab, Zuher

2011-02-22T23:59:59.000Z

204

3D discrete rotations using hinge angles Yohan Thibaulta,  

E-Print Network [OSTI]

3D discrete rotations using hinge angles Yohan Thibaulta, , Akihiro Sugimotob , Yukiko Kenmochia a of Informatics, Japan Abstract In this paper, we study 3D rotations on grid points computed by using only integers. For that purpose, we investigate the intersection between the 3D half- grid and the rotation

Paris-Sud XI, Université de

205

Fractal algebras of discretization sequences Steffen Roch (TU Darmstadt)  

E-Print Network [OSTI]

Abstract Fractal algebras of discretization sequences Steffen Roch (TU Darmstadt) First a warning: Fractality, in the sense of these lectures, has nothing to do with fractal geometries or broken dimensions or other involved things. Rather, the notion fractal algebra had been chosen in order to emphasize

Potts, Daniel

206

Controlling Wild Mobile Robots Using Virtual Gates and Discrete Transitions  

E-Print Network [OSTI]

Controlling Wild Mobile Robots Using Virtual Gates and Discrete Transitions Leonardo Bobadilla purposely design them to execute wild motions, which means each will strike every open set infinitely often, "wildly behaving" robots that move more-or-less straight until a wall is contacted. They then pick

LaValle, Steven M.

207

Discrete Applied Mathematics 121 (2002) 139153 NeST graphs  

E-Print Network [OSTI]

Discrete Applied Mathematics 121 (2002) 139­153 NeST graphs Ryan B. Haywarda; , Paul E. Kearneyb; received in revised form 14 March 2001; accepted 26 March 2001 Abstract We establish results on NeST graphs show the equivalence of proper NeST graphs and unit NeST graphs, the equivalence of ÿxed distance NeST

Hayward, Ryan B.

208

Energy-Efficient Discrete Cosine Transform on Ronald Scrofano  

E-Print Network [OSTI]

Energy-Efficient Discrete Cosine Transform on FPGAs Ronald Scrofano Department of Computer Science is brought to mobile devices, it becomes important that it is possible to calculate the DCT in an energy-efficient the DCT with a linear array of PEs. This design is optimized for energy efficiency. We analyze the energy

Jang, Ju-Wook

209

Discrete fracture modeling for fractured reservoirs using Voronoi grid blocks  

E-Print Network [OSTI]

or pseudofracture groups modeled in their own grid blocks. Discrete Fracture Modeling (DFN) is still a relatively new field, and most research on it up to this point has been done with Delaunay tessellations. This research investigates an alternative approach using...

Gross, Matthew Edward

2007-09-17T23:59:59.000Z

210

Coded Adaptive Linear Precoded Discrete Multitone Over PLC Channel  

E-Print Network [OSTI]

Coded Adaptive Linear Precoded Discrete Multitone Over PLC Channel Fahad Syed Muhammmad, Jean- DMT system is presented in the power line communication (PLC) context with a loading algorithm which spectral density constraint. Using a multipath model of PLC channel, it is shown that the proposed coded

Boyer, Edmond

211

Finite Element Discretization Strategies for the Inverse Electrocardiographic (ECG) Problem  

E-Print Network [OSTI]

Finite Element Discretization Strategies for the Inverse Electrocardiographic (ECG) Problem Dafang electrocardiographic (ECG) problems re- quires the ability to both quantify and minimize approxi- mation errors specifically for the inverse ECG prob- lem. By quantitatively analyzing the connection between the ill

Utah, University of

212

Extreme-Point Stability Tests for Discrete-Time Polynomials  

E-Print Network [OSTI]

TA9 -10:40 Extreme-Point Stability Tests for Discrete-Time Polynomials F. PCrez *, C been an increasinginterest in finding extreme- point results for the study of stability of uncertain in the coefficients space where Schur stability of the extremes im- plies the stability of the entire family 12). Our

213

GPU accelerated simulations of 3D deterministic particle transport using discrete ordinates method  

SciTech Connect (OSTI)

Graphics Processing Unit (GPU), originally developed for real-time, high-definition 3D graphics in computer games, now provides great faculty in solving scientific applications. The basis of particle transport simulation is the time-dependent, multi-group, inhomogeneous Boltzmann transport equation. The numerical solution to the Boltzmann equation involves the discrete ordinates (S{sub n}) method and the procedure of source iteration. In this paper, we present a GPU accelerated simulation of one energy group time-independent deterministic discrete ordinates particle transport in 3D Cartesian geometry (Sweep3D). The performance of the GPU simulations are reported with the simulations of vacuum boundary condition. The discussion of the relative advantages and disadvantages of the GPU implementation, the simulation on multi GPUs, the programming effort and code portability are also reported. The results show that the overall performance speedup of one NVIDIA Tesla M2050 GPU ranges from 2.56 compared with one Intel Xeon X5670 chip to 8.14 compared with one Intel Core Q6600 chip for no flux fixup. The simulation with flux fixup on one M2050 is 1.23 times faster than on one X5670.

Gong Chunye, E-mail: gongchunye@gmail.com [School of Computer Science, National University of Defense Technology, Changsha 410073 (China); Liu Jie, E-mail: liujie@nudt.edu.cn [School of Computer Science, National University of Defense Technology, Changsha 410073 (China); Chi Lihua [School of Computer Science, National University of Defense Technology, Changsha 410073 (China); Huang Haowei [Institut fuer Informatik, Technische Universitaet Muenchen, D-85748 Garching, Munich (Germany); Fang Jingyue [School of Physics and Mathematics, National University of Defense Technology, Changsha 410073 (China); Gong Zhenghu [School of Computer Science, National University of Defense Technology, Changsha 410073 (China)

2011-07-01T23:59:59.000Z

214

Atmospheric science and power production  

SciTech Connect (OSTI)

This is the third in a series of scientific publications sponsored by the US Atomic Energy Commission and the two later organizations, the US Energy Research and Development Adminstration, and the US Department of Energy. The first book, Meteorology and Atomic Energy, was published in 1955; the second, in 1968. The present volume is designed to update and to expand upon many of the important concepts presented previously. However, the present edition draws heavily on recent contributions made by atmospheric science to the analysis of air quality and on results originating from research conducted and completed in the 1970s. Special emphasis is placed on how atmospheric science can contribute to solving problems relating to the fate of combustion products released into the atmosphere. The framework of this book is built around the concept of air-quality modeling. Fundamentals are addressed first to equip the reader with basic background information and to focus on available meteorological instrumentation and to emphasize the importance of data management procedures. Atmospheric physics and field experiments are described in detail to provide an overview of atmospheric boundary layer processes, of how air flows around obstacles, and of the mechanism of plume rise. Atmospheric chemistry and removal processes are also detailed to provide fundamental knowledge on how gases and particulate matter can be transformed while in the atmosphere and how they can be removed from the atmosphere. The book closes with a review of how air-quality models are being applied to solve a wide variety of problems. Separate analytics have been prepared for each chapter.

Randerson, D. (ed.)

1984-07-01T23:59:59.000Z

215

Laser Atmospheric Studies with VERITAS  

E-Print Network [OSTI]

As a calibrated laser pulse propagates through the atmosphere, the amount of Rayleigh-scattered light arriving at the VERITAS telescopes can be calculated precisely. This technique was originally developed for the absolute calibration of ultra-high-energy cosmic-ray fluorescence telescopes but is also applicable to imaging atmospheric Cherenkov telescopes (IACTs). In this paper, we present two nights of laser data taken with the laser at various distances away from the VERITAS telescopes and compare it to Rayleigh scattering simulations.

C. M. Hui; for the VERITAS collaboration

2007-09-25T23:59:59.000Z

216

Removal of Pollutants by Atmospheric Non Thermal Plasmas Ahmed Khacef 1*  

E-Print Network [OSTI]

1 Removal of Pollutants by Atmospheric Non Thermal Plasmas Ahmed Khacef 1* , Jean Marie Cormier1]. The electron beam technique which is very efficient for removal of pollutants such NOx and VOCs has been first operating conditions (atmospheric pressure and room temperature), and relatively low maintenance

Paris-Sud XI, Université de

217

Overturning and wind driven circulation in a low-order ocean-atmosphere model  

E-Print Network [OSTI]

july 2002 Abstract A low-order ocean-atmosphere model is presented which combines coupling through heat exchange at the interface and wind stress forcing. The coupling terms are derived from the boundary conditions and the forcing terms of the constituents. Both the ocean and the atmosphere model are based

van Veen, Lennaert

218

Fragmentation Energetics of Clusters Relevant to Atmospheric...  

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

of Clusters Relevant to Atmospheric New Particle Formation. Fragmentation Energetics of Clusters Relevant to Atmospheric New Particle Formation. Abstract: The exact mechanisms by...

219

Analysis of Dual Consistency for Discontinuous Galerkin Discretizations of Source Terms  

E-Print Network [OSTI]

The effects of dual consistency on discontinuous Galerkin discretizations of solution and solution gradient dependent source terms are examined. Two common discretizations are analyzed: the standard weighting technique for ...

Darmofal, David L.

220

Linearisation of the (M,K)-reduced non-autonomous discrete periodic KP equation  

E-Print Network [OSTI]

The (M,K)-reduced non-autonomous discrete KP equation is linearised on the Picard group of an algebraic curve. As an application, we construct theta function solutions to the initial value problem of some special discrete KP equation.

Shinsuke Iwao

2009-12-17T23:59:59.000Z

Note: This page contains sample records for the topic "discrete atmospheric conditions" 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

An energy-preserving muscle tissue model: formulation and compatible discretizations  

E-Print Network [OSTI]

An energy-preserving muscle tissue model: formulation and compatible discretizations D. Chapelle ­ phenomena associated with these energy considerations. Keywords: muscle tissue modeling; myocardium; multiscale; energy balance; time and space discretizations 1 Introduction The modeling of the active

Paris-Sud XI, Université de

222

Representative Atmospheric Plume Development for Elevated Releases  

SciTech Connect (OSTI)

An atmospheric explosion of a low-yield nuclear device will produce a large number of radioactive isotopes, some of which can be measured with airborne detection systems. However, properly equipped aircraft may not arrive in the region where an explosion occurred for a number of hours after the event. Atmospheric conditions will have caused the radioactive plume to move and diffuse before the aircraft arrives. The science behind predicting atmospheric plume movement has advanced enough that the location of the maximum concentrations in the plume can be determined reasonably accurately in real time, or near real time. Given the assumption that an aircraft can follow a plume, this study addresses the amount of atmospheric dilution expected to occur in a representative plume as a function of time past the release event. The approach models atmospheric transport of hypothetical releases from a single location for every day in a year using the publically available HYSPLIT code. The effective dilution factors for the point of maximum concentration in an elevated plume based on a release of a non-decaying, non-depositing tracer can vary by orders of magnitude depending on the day of the release, even for the same number of hours after the release event. However, the median of the dilution factors based on releases for 365 consecutive days at one site follows a power law relationship in time, as shown in Figure S-1. The relationship is good enough to provide a general rule of thumb for estimating typical future dilution factors in a plume starting at the same point. However, the coefficients of the power law function may vary for different release point locations. Radioactive decay causes the effective dilution factors to decrease more quickly with the time past the release event than the dilution factors based on a non-decaying tracer. An analytical expression for the dilution factors of isotopes with different half-lives can be developed given the power law expression for the non-decaying tracer. If the power-law equation for the median dilution factor, Df, based on a non-decaying tracer has the general form Df=a?×t?^(-b) for time t after the release event, then the equation has the form Df=e^(-?t)×a×t^(-b) for a radioactive isotope, where ? is the decay constant for the isotope.

Eslinger, Paul W.; Lowrey, Justin D.; McIntyre, Justin I.; Miley, Harry S.; Prichard, Andrew W.

2014-03-03T23:59:59.000Z

223

Atmospheric Radiation Measurement Program Science Plan  

SciTech Connect (OSTI)

The Atmospheric Radiation Measurement (ARM) Program has matured into one of the key programs in the U.S. Climate Change Science Program. The ARM Program has achieved considerable scientific success in a broad range of activities, including site and instrument development, atmospheric radiative transfer, aerosol science, determination of cloud properties, cloud modeling, and cloud parameterization testing and development. The focus of ARM science has naturally shifted during the last few years to an increasing emphasis on modeling and parameterization studies to take advantage of the long time series of data now available. During the next 5 years, the principal focus of the ARM science program will be to: Maintain the data record at the fixed ARM sites for at least the next five years. Improve significantly our understanding of and ability to parameterize the 3-D cloud-radiation problem at scales from the local atmospheric column to the global climate model (GCM) grid square. Continue developing techniques to retrieve the properties of all clouds, with a special focus on ice clouds and mixed-phase clouds. Develop a focused research effort on the indirect aerosol problem that spans observations, physical models, and climate model parameterizations. Implement and evaluate an operational methodology to calculate broad-band heating rates in the atmospheric columns at the ARM sites. Develop and implement methodologies to use ARM data more effectively to test atmospheric models, both at the cloud-resolving model scale and the GCM scale. Use these methodologies to diagnose cloud parameterization performance and then refine these parameterizations to improve the accuracy of climate model simulations. In addition, the ARM Program is actively developing a new ARM Mobile Facility (AMF) that will be available for short deployments (several months to a year or more) in climatically important regions. The AMF will have much of the same instrumentation as the remote facilities at ARM's Tropical Western Pacific and the North Slope of Alaska sites. Over time, this new facility will extend ARM science to a much broader range of conditions for model testing.

Ackerman, T

2004-10-31T23:59:59.000Z

224

Retrieval of cloud-cleared atmospheric temperature profiles from hyperspectral infrared and microwave observations  

E-Print Network [OSTI]

This thesis addresses the problem of retrieving the temperature profile of the Earth's atmosphere from overhead infrared and microwave observations of spectral radiance in cloudy conditions. The contributions of the thesis ...

Blackwell, William Joseph, 1971-

2002-01-01T23:59:59.000Z

225

atmospheric aerosol source-receptor: Topics by E-print Network  

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

coefficient is 0.5 and then 1.0 2. For the same conditions calculate the H Weber, Rodney 6 Secondary organic aerosol 1. Atmospheric chemical mechanism for production...

226

Accounting for StreamAquifer Interactions in the State-Space Discretization of the  

E-Print Network [OSTI]

­Milyukov­Nash Cascade for Streamflow Forecasting Jozsef Szilagyi1 Abstract: A sample-data system discretization

Szilagyi, Jozsef

227

TIME DISCRETE GEODESIC PATHS IN THE SPACE OF IMAGES B. BERKELS, A. EFFLAND, M. RUMPF  

E-Print Network [OSTI]

TIME DISCRETE GEODESIC PATHS IN THE SPACE OF IMAGES B. BERKELS, A. EFFLAND, M. RUMPF Abstract and intensity variation. A robust and effective variational time discretization of geodesics paths is proposed requirements for the input images, the existence of discrete geodesic paths defined as minimizers

Rumpf, Martin

228

DISCRETE GEODESIC CALCULUS IN THE SPACE OF VISCOUS FLUIDIC MARTIN RUMPF AND BENEDIKT WIRTH  

E-Print Network [OSTI]

DISCRETE GEODESIC CALCULUS IN THE SPACE OF VISCOUS FLUIDIC OBJECTS MARTIN RUMPF AND BENEDIKT WIRTH cheap dissimilarity measure, a time discrete geodesic calculus is developed, and applications to shape in shape space. The notion of discrete geodesics defined as energy minimizing paths gives rise

Rumpf, Martin

229

A DUALITY APPROACH TO THE GENEALOGIES OF DISCRETE NON-NEUTRAL WRIGHT-FISHER MODELS  

E-Print Network [OSTI]

A DUALITY APPROACH TO THE GENEALOGIES OF DISCRETE NON-NEUTRAL WRIGHT-FISHER MODELS THIERRY E formu- lae still are of great use when considering discrete non-neutral Wright-Fisher models, Running title: Duality and Discrete Non-Neutral Wright-Fisher Models. Keywords: Wright-Fisher Models

Paris-Sud XI, Université de

230

CERNA WORKING PAPER SERIES Patent quality and value in discrete and cumulative innovation  

E-Print Network [OSTI]

1 CERNA WORKING PAPER SERIES Patent quality and value in discrete and cumulative innovation Justus,version2-16Nov2010 #12;2 Patent Quality and Value in Discrete and Cumulative Innovation Cerna Working the relationship between patent quality and patent value in discrete and cumulative innovation. Using factor

Paris-Sud XI, Université de

231

An Isometric Dynamics for a Causal Set Approach to Discrete Quantum Gravity  

E-Print Network [OSTI]

We consider a covariant causal set approach to discrete quantum gravity. We first review the microscopic picture of this approach. In this picture a universe grows one element at a time and its geometry is determined by a sequence of integers called the shell sequence. We next present the macroscopic picture which is described by a sequential growth process. We introduce a model in which the dynamics is governed by a quantum transition amplitude. The amplitude satisfies a stochastic and unitary condition and the resulting dynamics becomes isometric. We show that the dynamics preserves stochastic states. By "doubling down" on the dynamics we obtain a unitary group representation and a natural energy operator. These unitary operators are employed to define canonical position and momentum operators.

Stan Gudder

2014-09-12T23:59:59.000Z

232

Discrete-Time Pricing and Optimal Exercise of American Perpetual Warrants in the Geometric Random Walk Model  

SciTech Connect (OSTI)

An American option (or, warrant) is the right, but not the obligation, to purchase or sell an underlying equity at any time up to a predetermined expiration date for a predetermined amount. A perpetual American option differs from a plain American option in that it does not expire. In this study, we solve the optimal stopping problem of a perpetual American option (both call and put) in discrete time using linear programming duality. Under the assumption that the underlying stock price follows a discrete time and discrete state Markov process, namely a geometric random walk, we formulate the pricing problem as an infinite dimensional linear programming (LP) problem using the excessive-majorant property of the value function. This formulation allows us to solve complementary slackness conditions in closed-form, revealing an optimal stopping strategy which highlights the set of stock-prices where the option should be exercised. The analysis for the call option reveals that such a critical value exists only in some cases, depending on a combination of state-transition probabilities and the economic discount factor (i.e., the prevailing interest rate) whereas it ceases to be an issue for the put.

Vanderbei, Robert J., E-mail: rvdb@princeton.edu [Princeton University, Department of Operations Research and Financial Engineering (United States); P Latin-Small-Letter-Dotless-I nar, Mustafa C., E-mail: mustafap@bilkent.edu.tr [Bilkent University, Department of Industrial Engineering (Turkey); Bozkaya, Efe B. [Sabanc Latin-Small-Letter-Dotless-I University, Faculty of Administrative Sciences (Turkey)] [Sabanc Latin-Small-Letter-Dotless-I University, Faculty of Administrative Sciences (Turkey)

2013-02-15T23:59:59.000Z

233

Monte Carlo solution of a semi-discrete transport equation  

SciTech Connect (OSTI)

The authors present the S{sub {infinity}} method, a hybrid neutron transport method in which Monte Carlo particles traverse discrete space. The goal of any deterministic/stochastic hybrid method is to couple selected characters from each of the methods in hopes of producing a better method. The S{sub {infinity}} method has the features of the lumped, linear-discontinuous (LLD) spatial discretization, yet it has no ray-effects because of the continuous angular variable. They derive the S{sub {infinity}} method for the solid-state, mono-energetic transport equation in one-dimensional slab geometry with isotropic scattering and an isotropic internal source. They demonstrate the viability of the S{sub {infinity}} method by comparing their results favorably to analytic and deterministic results.

Urbatsch, T.J.; Morel, J.E.; Gulick, J.C.

1999-09-01T23:59:59.000Z

234

A discrete model for compressible flows in heterogeneous media  

SciTech Connect (OSTI)

This work deals with the building of a discrete model able to describe and to predict the evolution of complex gas flows in heterogeneous media. In many physical applications, large scales numerical simulation is no longer possible because of a lack of computing resources. Indeed the medium topology may be complex due to the presence of many obstacles (walls, pipes, equipments, geometric singularities etc.). Aircraft powerplant compartments are examples where topology is complex due to the presence of pipes, ducts, coolers and other equipment. Other important examples are gas explosions and large scale dispersion of hazardous materials in urban places, cities or underground involving obstacles such as buildings and various infrastructures. In all cases efficient safety responses are required. Then a new discrete model is built and solved in reasonable execution times for large cells volumes including such obstacles. Quantitative comparisons between experimental and numerical results are shown for different significant test cases, showing excellent agreement.

Le Metayer, O., E-mail: Olivier.Lemetayer@polytech.univ-mrs.f [IUSTI, UMR CNRS 6595, Universite Aix-Marseille I, Technopole de Chateau Gombert, 5 Rue E. Fermi, 13453 Marseille Cedex 13 (France); SMASH project, INRIA, 2004 route des Lucioles, 06902 Sophia Antipolis (France); Massol, A., E-mail: Alexandre.Massol@airbus.co [AIRBUS Operations SAS, Coc Powerplant, EDET30, M0112/5, 316 Route de Bayonne, 31060 Toulouse Cedex 09 (France); Favrie, N., E-mail: Nicolas.Favrie@polytech.univ-mrs.f [IUSTI, UMR CNRS 6595, Universite Aix-Marseille I, Technopole de Chateau Gombert, 5 Rue E. Fermi, 13453 Marseille Cedex 13 (France); SMASH project, INRIA, 2004 route des Lucioles, 06902 Sophia Antipolis (France); Hank, S., E-mail: Sarah.Hank@polytech.univ-mrs.f [IUSTI, UMR CNRS 6595, Universite Aix-Marseille I, Technopole de Chateau Gombert, 5 Rue E. Fermi, 13453 Marseille Cedex 13 (France); SMASH project, INRIA, 2004 route des Lucioles, 06902 Sophia Antipolis (France)

2011-04-01T23:59:59.000Z

235

Weakly bound molecules trapped with discrete scaling symmetries  

E-Print Network [OSTI]

When the scattering length is proportional to the distance from the center of the system, two particles are shown to be trapped about the center. Furthermore, their spectrum exhibits discrete scale invariance, whose scale factor is controlled by the slope of the scattering length. While this resembles the Efimov effect, our system has a number of advantages when realized with ultracold atoms. We also elucidate how the emergent discrete scaling symmetry is violated for more than two bosons, which may shed new light on Efimov physics. Our system thus serves as a tunable model system to investigate universal physics involving scale invariance, quantum anomaly, and renormalization group limit cycle, which are important in a broad range of quantum physics.

Yusuke Nishida; Dean Lee

2012-09-12T23:59:59.000Z

236

The Discrete Geometry of a Small Causal Diamond  

E-Print Network [OSTI]

We study the discrete causal set geometry of a small causal diamond in a curved spacetime using the average abundance of k-element chains or total orders in the underlying causal set C. We begin by obtaining the first order curvature corrections to the flat spacetime expression for the abundance using Riemann normal coordinates. For fixed spacetime dimension this allows us to find a new expression for the discrete scalar curvature of C as well as the time-time component of its Ricci tensor in terms of the abundances of k-chains. We also find a new dimension estimator for C which replaces the flat spacetime Myrheim-Meyer estimator in generic curved spacetimes.

Mriganko Roy; Debdeep Sinha; Sumati Surya

2012-12-04T23:59:59.000Z

237

The discrete Kalman filtering approach for seismic signals deconvolution  

SciTech Connect (OSTI)

Seismic signals are a convolution of reflectivity and seismic wavelet. One of the most important stages in seismic data processing is deconvolution process; the process of deconvolution is inverse filters based on Wiener filter theory. This theory is limited by certain modelling assumptions, which may not always valid. The discrete form of the Kalman filter is then used to generate an estimate of the reflectivity function. The main advantage of Kalman filtering is capability of technique to handling continually time varying models and has high resolution capabilities. In this work, we use discrete Kalman filter that it was combined with primitive deconvolution. Filtering process works on reflectivity function, hence the work flow of filtering is started with primitive deconvolution using inverse of wavelet. The seismic signals then are obtained by convoluting of filtered reflectivity function with energy waveform which is referred to as the seismic wavelet. The higher frequency of wavelet gives smaller wave length, the graphs of these results are presented.

Kurniadi, Rizal; Nurhandoko, Bagus Endar B. [Departement of Physics Intitut Teknologi Bandung, Jl. Ganesha 10 Bandung (Indonesia)

2012-06-20T23:59:59.000Z

238

Quantum Mechanics and Discrete Time from "Timeless" Classical Dynamics  

E-Print Network [OSTI]

We study classical Hamiltonian systems in which the intrinsic proper time evolution parameter is related through a probability distribution to the physical time, which is assumed to be discrete. - This is motivated by the ``timeless'' reparametrization invariant model of a relativistic particle with two compactified extradimensions. In this example, discrete physical time is constructed based on quasi-local observables. - Generally, employing the path-integral formulation of classical mechanics developed by Gozzi et al., we show that these deterministic classical systems can be naturally described as unitary quantum mechanical models. The emergent quantum Hamiltonian is derived from the underlying classical one. It is closely related to the Liouville operator. We demonstrate in several examples the necessity of regularization, in order to arrive at quantum models with bounded spectrum and stable groundstate.

H. -T. Elze

2003-07-03T23:59:59.000Z

239

Renormalized waves and discrete breathers in $?$-FPU chains  

E-Print Network [OSTI]

We demonstrate via numerical simulation that in the \\textit{strongly} nonlinear limit, the $\\beta$-FPU system in thermal equilibrium behaves surprisingly like weakly nonlinear waves in properly renormalized normal variables. This arises because the collective effect of strongly nonlinear interactions effectively renormalizes linear dispersion frequency and leads to effectively weak interaction among these renormalized waves. Furthermore, we show that the dynamical scenario for thermalized $\\beta$-FPU chains is spatially highly localized discrete breathers riding chaotically on spatially extended, renormalized waves.

Boris Gershgorin; Yuri V. Lvov; David Cai

2005-08-20T23:59:59.000Z

240

Discrete quadratic solitons with competing second-harmonic components  

SciTech Connect (OSTI)

We describe families of discrete solitons in quadratic waveguide arrays supported by competing cascaded nonlinear interactions between one fundamental and two second-harmonic modes. We characterize the existence, stability, and excitation dynamics of these solitons and show that their features may resemble those of solitons in saturable media. Our results also demonstrate that a power threshold may appear for soliton formation, leading to a suppression of beam self-focusing which explains recent experimental observations.

Setzpfandt, Frank; Pertsch, Thomas [Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller-Universitaet Jena, Max-Wien-Platz 1, D-07743 Jena (Germany); Sukhorukov, Andrey A. [Nonlinear Physics Center, Research School of Physics and Engineering, Australian National University, Canberra, 0200 ACT (Australia)

2011-11-15T23:59:59.000Z

Note: This page contains sample records for the topic "discrete atmospheric conditions" 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

Heuristic Optimization for the Discrete Virtual Power Plant Dispatch Problem  

SciTech Connect (OSTI)

We consider a virtual power plant, which is given the task of dispatching a fluctuating power supply to a portfolio of flexible consumers. The flexible consumers are modeled as discrete batch processes, and the associated optimization problem is denoted the discrete virtual power plant dispatch problem (DVPPDP). First, the nondeterministic polynomial time (NP)-completeness of the discrete virtual power plant dispatch problem is proved formally. We then proceed to develop tailored versions of the meta-heuristic algorithms hill climber and greedy randomized adaptive search procedure (GRASP). The algorithms are tuned and tested on portfolios of varying sizes. We find that all the tailored algorithms perform satisfactorily in the sense that they are able to find sub-optimal, but usable, solutions to very large problems (on the order of 105 units) at computation times on the scale of just 10 s, which is far beyond the capabilities of the optimal algorithms we have tested. In particular, GRASP sorted shows with the most promising performance, as it is able to find solutions that are both agile (sorted) and well balanced, and consistently yields the best numerical performance among the developed algorithms.

Petersen, Mette K.; Hansen, Lars H.; Bendtsen, Jan; Edlund, Kristian; Stoustrup, Jakob

2014-10-17T23:59:59.000Z

242

SIO 217a Atmospheric and Climate Sciences I: Atmospheric Thermodynamics  

E-Print Network [OSTI]

. Radiant Energy. Radiative Transfer. Transport.) 10-Oct W 3 More Transfer Processes 15-Oct M 4 4 Gas. Equation of State. Hydrostatic Equilibrium.) 3-Oct W 2 2.11 First and Second Laws and Characteristics. Precipitation Processes. Radiative Transfer in a Cloudy Atmosphere. Fogs, Stratus

Russell, Lynn

243

Linked Environments for Atmospheric Discovery Linked Environments for Atmospheric  

E-Print Network [OSTI]

Unidata Program Center #12;Linked Environments for Atmospheric Discovery The Team: 9 institutions and 105 MethodologyTraditional NWP Methodology STATIC OBSERVATIONS Radar Data Mobile Mesonets Surface Observations Satellites The Process is Entirely Prescheduled and Serial; It Does NOT Respond to the Weather! The Process

244

NETL SOFC: Atmospheric Pressure Systems  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Opticalhttp://www.fnal.gov/directorate/nalcal/nalcal02_07_05_files/nalcal.gifA Comparison95519LocalizedWaterTerryAtmospheric

245

A Thermal Discrete Element Analysis of EU Solid Breeder Blanket subjected to Neutron Irradiation  

E-Print Network [OSTI]

Due to neutron irradiation, solid breeder blankets are subjected to complex thermo-mechanical conditions. Within one breeder unit, the ceramic breeder bed is composed of spherical-shaped lithium orthosilicate pebbles, and as a type of granular material, it exhibits strong coupling between temperature and stress fields. In this paper, we study these thermo-mechanical problems by developing a thermal discrete element method (Thermal-DEM). This proposed simulation tool models each individual ceramic pebble as one element and considers grain-scale thermo-mechanical interactions between elements. A small section of solid breeder pebble bed in HCPB is modelled using thousands of individual pebbles and subjected to volumetric heating profiles calculated from neutronics under ITER-relevant conditions. We consider heat transfer at the grain-scale between pebbles through both solid-to-solid contacts and the interstitial gas phase, and we calculate stresses arising from thermal expansion of pebbles. The overall effective conductivity of the bed depends on the resulting compressive stress state during the neutronic heating. The thermal-DEM method proposed in this study provides the access to the grain-scale information, which is beneficial for HCPB design and breeder material optimization, and a better understanding of overall thermo-mechanical responses of the breeder units under fusion-relevant conditions.

Yixiang Gan; Francisco Hernandez; Dorian Hanaor; Ratna Annabattula; Marc Kamlah; Pavel Pereslavtsev

2014-06-17T23:59:59.000Z

246

HEATING THE ATMOSPHERE ABOVE SUNSPOTS  

E-Print Network [OSTI]

become fragmented and twisted, and where they generate the necessary energy to heat the solar coronaHEATING THE ATMOSPHERE ABOVE SUNSPOTS David Alexander and Neal E. Hurlburt Lockheed Martin Solar, University of Cambridge, Cambridge, CB3 9EW, UK Abstract We present our results of a hybrid model of sunspots

Rucklidge, Alastair

247

13, 90179049, 2013 Stable atmospheric  

E-Print Network [OSTI]

ACPD 13, 9017­9049, 2013 Stable atmospheric methane in the 2000s I. Pison et al. Title Page Utrecht, Utrecht University, Utrecht, the Netherlands 3 SRON Netherlands Institute for Space Research, Utrecht, the Netherlands 4 Vrije Universiteit, Department of Systems Ecology, Amsterdam, the Netherlands 5

Paris-Sud XI, Université de

248

Space Science: Atmosphere Thermal Structure  

E-Print Network [OSTI]

Space Science: Atmosphere Part -2 Thermal Structure Review tropospheres Absorption of Radiation Adiabatic Lapse Rate ~ 9 K/km Slightly smaller than our estimate Pressure ~3000ft under ocean surface thickness (positive up) is the solar zenith angle Fs is the solar energy flux at frequency (when

Johnson, Robert E.

249

ARM ARM Atmospheric Radiation Measurement Atmospheric Radiation Measurement  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth (AOD)Productssondeadjustsondeadjust Documentation DataProductswsicloudwsicloudsummarygifAOS Processing

250

Equilibria and Instabilities of a Slinky: Discrete Model  

E-Print Network [OSTI]

The Slinky is a well-known example of a highly flexible helical spring, exhibiting large, geometrically nonlinear deformations from minimal applied forces. By considering it as a system of coils that act to resist axial, shearing, and rotational deformations, we develop a discretized model to predict the equilibrium configurations of a Slinky via the minimization of its potential energy. Careful consideration of the contact between coils enables this procedure to accurately describe the shape and stability of the Slinky under different modes of deformation. In addition, we provide simple geometric and material relations that describe a scaling of the general behavior of flexible, helical springs.

Douglas P. Holmes; Andy D. Borum; Billy F. Moore III; Raymond H. Plaut; David A. Dillard

2014-03-26T23:59:59.000Z

251

A discrete-event simulation model for seaport operations.  

SciTech Connect (OSTI)

Discrete-event simulation has been used to assess detailed processes at seaports. Seaport operations are labor-intensive and require extensive use of personnel and machinery. The ability to conduct seaport operations efficiently can be improved significantly through proper utilization of seaport assets. The simulation described has been written in MODSIM II and addresses seaport operations in the context of military mobility. The simulation allows for multiple cargo types as well as multiple ship types. The overall goal of the simulation has been to determine seaport throughput capability.

Nevins, M. R.; Macal, C. M.; Joines, J.; Decision and Information Sciences; Transportation Engineering Agency

1998-01-01T23:59:59.000Z

252

Distributed mean curvature on a discrete manifold for Regge calculus  

E-Print Network [OSTI]

The integrated mean curvature of a simplicial manifold is well understood in both Regge Calculus and Discrete Differential Geometry. However, a well motivated pointwise definition of curvature requires a careful choice of volume over which to uniformly distribute the local integrated curvature. We show that hybrid cells formed using both the simplicial lattice and its circumcentric dual emerge as a remarkably natural structure for the distribution of this local integrated curvature. These hybrid cells form a complete tessellation of the simplicial manifold, contain a geometric orthonormal basis, and are also shown to give a pointwise mean curvature with a natural interpretation as a fractional rate of change of the normal vector.

Rory Conboye; Warner A. Miller; Shannon Ray

2015-02-26T23:59:59.000Z

253

Magnus force in discrete and continuous two-dimensional superfluids  

SciTech Connect (OSTI)

Motion of vortices in two-dimensional superfluids in the classical limit is studied by solving the Gross-Pitaevskii equation numerically on a uniform lattice. We find that, in the presence of a superflow directed along one of the main lattice periods, vortices move with the superflow on fine lattices but perpendicular to it on coarse ones. We interpret this result as a transition from the full Magnus force in a Galilean-invariant limit to vanishing effective Magnus force in a discrete system, in agreement with the existing experiments on vortex motion in Josephson junction arrays.

Gecse, Z.; Khlebnikov, S. [Department of Physics, Purdue University, West Lafayette, Indiana 47907 (United States)

2005-08-01T23:59:59.000Z

254

AtmoHEAD 2013 workshop / Atmospheric Monitoring for High-Energy Astroparticle Detectors  

E-Print Network [OSTI]

A 3-day international workshop on atmospheric monitoring and calibration for high-energy astroparticle detectors, with a view towards next-generation facilities. The atmosphere is an integral component of many high-energy astroparticle detectors. Imaging atmospheric Cherenkov telescopes and cosmic-ray extensive air shower detectors are the two instruments driving the rapidly evolving fields of very-high- and ultra-high-energy astrophysics. In these instruments, the atmosphere is used as a giant calorimeter where cosmic rays and gamma rays deposit their energy and initiate EASs; it is also the medium through which the resulting Cherenkov light propagates. Uncertainties in real-time atmospheric conditions and in the fixed atmospheric models typically dominate all other systematic errors. With the improved sensitivity of upgraded IACTs such as H.E.S.S.-II and MAGIC-II and future facilities like the Cherenkov Telescope Array (CTA) and JEM-EUSO, statistical uncertainties are expected to be significantly reduced, leaving the atmosphere as the limiting factor in the determination of astroparticle spectra. Varying weather conditions necessitate the development of suitable atmospheric monitoring to be integrated in the overall instrument calibration, including Monte Carlo simulations. With expertise distributed across multiple collaborations and scientific domains, an interdisciplinary workshop is being convened to advance progress on this critical and timely topic.

K. Bernlöhr; G. Bellassai; O. Blanch; M. Bourgeat; P. Bruno; M. Buscemi; C. Cassardo; P. M. Chadwick; R. Chalme-Calvet; F. Chouza; M. Cilmo; M. Coco; J. Colombi; M. Compin; M. K. Daniel; R. De Los Reyes; J. Ebr; R. D'Elia; C. Deil; A. Etchegoyen; M. Doro; S. Ferrarese; M. Fiorini; LL. Font; D. Garrido; H. Gast; M. Gaug; F. Gonzales; A. Grillo; F. Guarino; J. Hahn; M. Hrabovsky; K. Kosack; P. Krüger; G. La Rosa; G. Leto; Y. T. E. Lo; A. López-Oramas; K. Louedec; M. C. Maccarone; D. Mandat; V. Marandon; E. Martinetti; M. Martinez; M. de Naurois; A. Neronov; S. J. Nolan; L. Otero; M. Palatka; J. Pallotta; M. Pech; G. Puhlhofer; M. Prouza; E. Quel; D. Raul; P. Ristori; M. D. Rodriguez Frias; S. Rivoire; C. B. Rulten; P. Schovanek; A. Segreto; G. Sottile; L. Stringhetti; J. -P. Tavernet; A. S. Tonachini; S. Toscano; P. Travnicek; L. Valore; G. Vasileiadis; S. Vincent; S. Wada; L. Wiencke; M. Will

2014-03-19T23:59:59.000Z

255

Atmospheric-pressure plasma jet  

DOE Patents [OSTI]

Atmospheric-pressure plasma jet. A .gamma.-mode, resonant-cavity plasma discharge that can be operated at atmospheric pressure and near room temperature using 13.56 MHz rf power is described. Unlike plasma torches, the discharge produces a gas-phase effluent no hotter than 250.degree. C. at an applied power of about 300 W, and shows distinct non-thermal characteristics. In the simplest design, two concentric cylindrical electrodes are employed to generate a plasma in the annular region therebetween. A "jet" of long-lived metastable and reactive species that are capable of rapidly cleaning or etching metals and other materials is generated which extends up to 8 in. beyond the open end of the electrodes. Films and coatings may also be removed by these species. Arcing is prevented in the apparatus by using gas mixtures containing He, which limits ionization, by using high flow velocities, and by properly shaping the rf-powered electrode. Because of the atmospheric pressure operation, no ions survive for a sufficiently long distance beyond the active plasma discharge to bombard a workpiece, unlike low-pressure plasma sources and conventional plasma processing methods.

Selwyn, Gary S. (Los Alamos, NM)

1999-01-01T23:59:59.000Z

256

Air conditioning system  

DOE Patents [OSTI]

An air conditioner comprises a plurality of plates arranged in a successively stacked configuration with portions thereof having a spaced apart arrangement, and defining between successive adjacent pairs of plates at the spaced apart portions a first and second series of discrete alternating passages wherein a first air stream is passed through the first series of passages and a second air stream is passed through the second series of passages; and said stacked configuration of plates forming integrally therewith a liquid delivery means for delivering from a source a sufficient quantity of a liquid to the inside surfaces of the first series of fluid passages in a manner which provides a continuous flow of the liquid from a first end to a second end of the plurality of plates while in contact with the first air stream.

Lowenstein, Andrew; Miller, Jeffrey; Gruendeman, Peter; DaSilva, Michael

2005-02-01T23:59:59.000Z

257

Sulfuryl fluoride in the global atmosphere  

E-Print Network [OSTI]

The first calibrated high-frequency, high-precision, in situ atmospheric and archived air measurements of the fumigant sulfuryl fluoride (SO[subscript 2]F[subscript 2]) have been made as part of the Advanced Global Atmospheric ...

Muhle, J.

258

Discrete magic angle turning system, apparatus, and process for in situ magnetic resonance spectroscopy and imaging  

DOE Patents [OSTI]

Described are a "Discrete Magic Angle Turning" (DMAT) system, devices, and processes that combine advantages of both magic angle turning (MAT) and magic angle hopping (MAH) suitable, e.g., for in situ magnetic resonance spectroscopy and/or imaging. In an exemplary system, device, and process, samples are rotated in a clockwise direction followed by an anticlockwise direction of exactly the same amount. Rotation proceeds through an angle that is typically greater than about 240 degrees but less than or equal to about 360 degrees at constant speed for a time applicable to the evolution dimension. Back and forth rotation can be synchronized and repeated with a special radio frequency (RF) pulse sequence to produce an isotropic-anisotropic shift 2D correlation spectrum. The design permits tubes to be inserted into the sample container without introducing plumbing interferences, further allowing control over such conditions as temperature, pressure, flow conditions, and feed compositions, thus permitting true in-situ investigations to be carried out.

Hu, Jian Zhi (Richland, WA); Sears, Jr., Jesse A. (Kennewick, WA); Hoyt, David W. (Richland, WA); Wind, Robert A. (Kennewick, WA)

2009-05-19T23:59:59.000Z

259

Radar range measurements in the atmosphere.  

SciTech Connect (OSTI)

The earth's atmosphere affects the velocity of propagation of microwave signals. This imparts a range error to radar range measurements that assume the typical simplistic model for propagation velocity. This range error is a function of atmospheric constituents, such as water vapor, as well as the geometry of the radar data collection, notably altitude and range. Models are presented for calculating atmospheric effects on radar range measurements, and compared against more elaborate atmospheric models.

Doerry, Armin Walter

2013-02-01T23:59:59.000Z

260

Quantitative determination of atmospheric hydroperoxyl radical  

DOE Patents [OSTI]

A method for the quantitative determination of atmospheric hydroperoxyl radical comprising: (a) contacting a liquid phase atmospheric sample with a chemiluminescent compound which luminesces on contact with hydroperoxyl radical; (b) determining luminescence intensity from the liquid phase atmospheric sample; and (c) comparing said luminescence intensity from the liquid phase atmospheric sample to a standard luminescence intensity for hydroperoxyl radical. An apparatus for automating the method is also included.

Springston, Stephen R. (Upton, NY); Lloyd, Judith (Westbury, NY); Zheng, Jun (Stony Brook, NY)

2007-10-23T23:59:59.000Z

Note: This page contains sample records for the topic "discrete atmospheric conditions" 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

A Method for Treating Discretization Error in Nondeterministic Analysis  

SciTech Connect (OSTI)

A response surface methodology-based technique is presented for treating discretization error in non-deterministic analysis. The response surface, or metamodel, is estimated from computer experiments which vary both uncertain physical parameters and the fidelity of the computational mesh. The resultant metamodel is then used to propagate the variabilities in the continuous input parameters, while the mesh size is taken to zero, its asymptotic limit. With respect to mesh size, the metamodel is equivalent to Richardson extrapolation, in which solutions on coarser and finer meshes are used to estimate discretization error. The method is demonstrated on a one dimensional prismatic bar, in which uncertainty in the third vibration frequency is estimated by propagating variations in material modulus, density, and bar length. The results demonstrate the efficiency of the method for combining non-deterministic analysis with error estimation to obtain estimates of total simulation uncertainty. The results also show the relative sensitivity of failure estimates to solution bias errors in a reliability analysis, particularly when the physical variability of the system is low.

Alvin, K.F.

1999-01-27T23:59:59.000Z

262

Fractured reservoir discrete feature network technologies. Final report, March 7, 1996 to September 30, 1998  

SciTech Connect (OSTI)

This report summarizes research conducted for the Fractured Reservoir Discrete Feature Network Technologies Project. The five areas studied are development of hierarchical fracture models; fractured reservoir compartmentalization, block size, and tributary volume analysis; development and demonstration of fractured reservoir discrete feature data analysis tools; development of tools for data integration and reservoir simulation through application of discrete feature network technologies for tertiary oil production; quantitative evaluation of the economic value of this analysis approach.

Dershowitz, William S.; Einstein, Herbert H.; LaPoint, Paul R.; Eiben, Thorsten; Wadleigh, Eugene; Ivanova, Violeta

1998-12-01T23:59:59.000Z

263

Atmospheric Radiation Measurement Radiative Atmospheric Divergence using ARM Mobile  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth (AOD)ProductssondeadjustsondeadjustAbout theOFFICEAmesApplication2ArgonneAssemblyDemandPlasma4August3Radiative

264

Atmospheric Radiation Measurement (ARM) Climate Research Facility and Atmospheric  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsruc DocumentationP-Series to someone byDear Friend,Arthur J. Nozik -GrownAnAtmospheric Radiation

265

Atmospheric Lifetime of Fossil Fuel Carbon Dioxide  

E-Print Network [OSTI]

Atmospheric Lifetime of Fossil Fuel Carbon Dioxide David Archer,1 Michael Eby,2 Victor Brovkin,3 released from combustion of fossil fuels equilibrates among the various carbon reservoirs of the atmosphere literature on the atmospheric lifetime of fossil fuel CO2 and its impact on climate, and we present initial

Scherer, Norbert F.

266

Impacts of Atmospheric Anthropogenic Nitrogen on the  

E-Print Network [OSTI]

anthropogenic carbon dioxide may result from this atmospheric nitrogen fertilization, leading to a decreaseImpacts of Atmospheric Anthropogenic Nitrogen on the Open Ocean R. A. Duce,1 * J. LaRoche,2 K quantities of atmospheric anthropogenic fixed nitrogen entering the open ocean could account for up to about

Ward, Bess

267

Ch4. Atmosphere and Surface Energy Balances  

E-Print Network [OSTI]

than red light. #12;The Electromagnetic Spectrum 8% 47% 45% 100% solar radiation #12;Blue Sky, Red;Energy Pathways #12;Solar radiation transfer in the atmosphere Solar radiation Reflection Atmosphere or performing any work. #12;Solar radiation transfer in the atmosphere Solar radiation Reflection Transmission

Pan, Feifei

268

Proof of the Atmospheric Greenhouse Effect  

E-Print Network [OSTI]

A recently advanced argument against the atmospheric greenhouse effect is refuted. A planet without an infrared absorbing atmosphere is mathematically constrained to have an average temperature less than or equal to the effective radiating temperature. Observed parameters for Earth prove that without infrared absorption by the atmosphere, the average temperature of Earth's surface would be at least 33 K lower than what is observed.

Smith, Arthur P

2008-01-01T23:59:59.000Z

269

ATS621, Fall 2013 Atmospheric Chemistry  

E-Print Network [OSTI]

ATS621, Fall 2013 Atmospheric Chemistry Tuesdays and Thursdays, 10 ­ 10:50, 212B ACRC) 491-8587 Teaching Assistant: Lauren Potter Atmospheric Chemistry Bldg., Room 11 Lepotter, transport, chemistry and deposition impact atmospheric chemical composition; 2) Explain the chemical

270

ATS621, Fall 2014 Atmospheric Chemistry  

E-Print Network [OSTI]

ATS621, Fall 2014 Atmospheric Chemistry Monday and Wednesday, 9 ­ 9:50, 212B ACRC Instructor: Prof) Understand quantitatively how emissions, transport, chemistry and deposition impact atmospheric chemical to Atmospheric Chemistry, D.J. Jacob Princeton University Press, 1999 PDF versions of the chapters can

Collett Jr., Jeffrey L.

271

Evaluation of Health Risks of Atmospheric Pollutants  

E-Print Network [OSTI]

4 5- (DRAFT) Evaluation of Health Risks of Atmospheric Pollutants Guy Landrieu INERIS Institut, Stuttgart : Germany (1995)" #12;INERIS: Evaluation of health risks of atmospheric pollutants (DRAFT may 1995) Evaluation of health risks of atmospheric pollutants Summary 1 Introduction 2 Background 3 Harmfulness

Paris-Sud XI, Université de

272

Ionisation in atmospheres of brown dwarfs and extrasolar planets VI: Properties of large-scale discharge events  

E-Print Network [OSTI]

Mineral clouds in substellar atmospheres play a special role as a catalyst for a variety of charge processes. If clouds are charged, the surrounding environment becomes electrically activated, and ensembles of charged grains are electrically discharging (e.g. by lightning), which significantly infuences the local chemistry creating conditions similar to those thought responsible for life in early planetary atmospheres. We note that such lightning discharges contribute also to the ionisation state of the atmosphere. We apply scaling laws for electrical discharge processes from laboratory measurements and numerical experiments to Drift-Phoenix model atmosphere results to model the discharge's propagation downwards (as lightning) and upwards (as sprites) through the atmospheric clouds. We evaluate the spatial extent and energetics of lightning discharges. The atmospheric volume affected (e.g. by increase of temperature or electron number) is larger in a brown dwarf atmosphere ($10^8 -~10^{10}$m$^3$) than in a gi...

Bailey, R L; Hodos, G; Bilger, C; Stark, C R

2013-01-01T23:59:59.000Z

273

Taming the Curse of Dimensionality: Discrete Integration by Hashing and Optimization  

E-Print Network [OSTI]

Taming the Curse of Dimensionality: Discrete Integration by Hashing and Optimization Stefano Ermon but without a tightness guarantee. Markov Chain Monte Carlo (MCMC) methods for sampling are asymptotically

Bejerano, Gill

274

all-atom discrete molecular: Topics by E-print Network  

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

recurrence satisfied by the Stirling numbers of the second kind. Abrams, Aaron; Hower, Valerie 2010-01-01 244 VARIATIONAL ESTIMATES FOR DISCRETE SCHR Mathematics Websites...

275

Terms and Conditions  

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

Testbed Results Current Testbed Research Proposal Process Terms and Conditions Dark Fiber Testbed Performance (perfSONAR) Software & Tools Development Partnerships...

276

Atmospheric Sciences Program Department of Marine, Earth and Atmospheric Sciences (MEAS)  

E-Print Network [OSTI]

atmospheric chemistry/air quality, boundary layer and air pollution meteorology, regional/global climatology MODELING OF MULTIPLE AIR POLLUTANTS AT URBAN AND REGIONAL SCALES Our atmosphere is a complex systemAtmospheric Sciences Program Department of Marine, Earth and Atmospheric Sciences (MEAS) (http

Parker, Matthew D. Brown

277

atmospheric nitrogen fluorescence: Topics by E-print Network  

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

Websites Summary: Greenhouse Effect and Atmospheric Warming Atmosphere absorbs heat energy A real greenhouse traps heatCh4. Atmosphere and Surface Energy Balances...

278

atmospheric pressure surface: Topics by E-print Network  

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

K. 27 Ch4. Atmosphere and Surface Energy Balances Geosciences Websites Summary: Greenhouse Effect and Atmospheric Warming Atmosphere absorbs heat energy A real greenhouse traps...

279

Sandia National Laboratories: atmospheric chemistry  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1development Sandia, NREL Release Wavearc-fault circuit interrupterchemistry

280

Sandia National Laboratories: atmospheric research  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1development Sandia, NREL Release Wavearc-fault circuit interrupterchemistryresearch

Note: This page contains sample records for the topic "discrete atmospheric conditions" 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.


281

Atmosphere to Electrons Program Overview  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:YearRound-Up fromDepartmentTie Ltd: Scope Change #1Impacts |Services SubcommitteeAtmosphere to

282

When Does Aid Conditionality Work?  

E-Print Network [OSTI]

institutions may tailor conditions for success because theytailor their conditions for success, and they are especially

Montinola, Gabriella R.

2010-01-01T23:59:59.000Z

283

Schur-decomposition for 3D matrix equations and its application in solving radiative discrete ordinates equations discretized by Chebyshev collocation spectral method  

SciTech Connect (OSTI)

The Schur-decomposition for three-dimensional matrix equations is developed and used to directly solve the radiative discrete ordinates equations which are discretized by Chebyshev collocation spectral method. Three methods, say, the spectral methods based on 2D and 3D matrix equation solvers individually, and the standard discrete ordinates method, are presented. The numerical results show the good accuracy of spectral method based on direct solvers. The CPU time cost comparisons against the resolutions between these three methods are made using MATLAB and FORTRAN 95 computer languages separately. The results show that the CPU time cost of Chebyshev collocation spectral method with 3D Schur-decomposition solver is the least, and almost only one thirtieth to one fiftieth CPU time is needed when using the spectral method with 3D Schur-decomposition solver compared with the standard discrete ordinates method.

Li Benwen [Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern University, P.O. Box 314, Shenyang, Liaoning 110004 (China)], E-mail: heatli@hotmail.com; Tian Shuai; Sun Yasong; Hu, Zhang-Mao [Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern University, P.O. Box 314, Shenyang, Liaoning 110004 (China)

2010-02-20T23:59:59.000Z

284

MSW effect with flavor changing interactions and the atmospheric neutrino problem  

E-Print Network [OSTI]

We consider flavor changing effective neutrino interactions in the context of massive neutrinos in the issue of atmospheric neutrinos. Assuming as usual that this is an indication of the oscillation of muon neutrinos into tau neutrinos we show that there is a set of parameters which is consistent with the MSW resonance condition for the typical Earth density and atmospheric neutrino energies. In particular we show that even if the vacuum mixing angle vanishes it is still possible to have a resonance which is compatible with the atmospheric neutrino data. We also briefly consider the case of the solar neutrino problem.

J. C. Montero; V. Pleitez

2000-05-08T23:59:59.000Z

285

Public key Steganography Using Discrete Cross-Coupled Chaotic Maps  

E-Print Network [OSTI]

By cross-coupling two logistic maps a novel method is proposed for the public key steganography in JPEG image. Chaotic maps entail high complexity in the used algorithm for embedding secret data in a medium. In this paper, discrete cross- coupled chaotic maps are used to specifying the location of the different parts of the secret data in the image. Modifying JPEG format during compressing and decompressing, and also using public key enhanced difficulty of the algorithm. Simulation results show that in addition to excessive capacity, this method has high robustness and resistance against hackers and can be applicable in secret communication. Also the PSNR value is high compared to the other works.

Sodeif Ahadpour; Mahdiyeh Majidpour; Yaser Sadra

2012-11-01T23:59:59.000Z

286

Spectra of Discrete Schrödinger Operators with Primitive Invertible Substitution Potentials  

E-Print Network [OSTI]

We study the spectral properties of discrete Schr\\"odinger operators with potentials given by primitive invertible substitution sequences (or by Sturmian sequences whose rotation angle has an eventually periodic continued fraction expansion, a strictly larger class than primitive invertible substitution sequences). It is known that operators from this family have spectra which are Cantor sets of zero Lebesgue measure. We show that the Hausdorff dimension of this set tends to $1$ as coupling constant $\\lambda$ tends to $0$. Moreover, we also show that at small coupling constant, all gaps allowed by the gap labeling theorem are open and furthermore open linearly with respect to $\\lambda$. Additionally, we show that, in the small coupling regime, the density of states measure for an operator in this family is exact dimensional. The dimension of the density of states measure is strictly smaller than the Hausdorff dimension of the spectrum and tends to $1$ as $\\lambda$ tends to $0$.

May Mei

2014-07-02T23:59:59.000Z

287

Discrete Boltzmann modeling of liquid-vapor system  

E-Print Network [OSTI]

We further probe the Discrete Boltzmann Modeling(DBM) of the single-component two phase flows or the liquid-vapor system. There are two kinds of nonequilibrium effects in the system. The first is the Mechanical NonEquilibrium(MNE). The second is the Thermodynamic NonEquilibrium(TNE). The MNE is well described in the traditional fluid dynamic theory. The description of TNE resorts to the gas kinetic theory. Since based on the Boltzmann equation, the DBM makes possible to analyze both the MNE and TNE. The TNE is the main discussion of this work. A major purpose of this work is to show that the DBM results can be used to confirm and/or improve the macroscopic modeling of complex system.

Aiguo Xu; Guangcai Zhang; Yanbiao Gan

2014-03-15T23:59:59.000Z

288

Cavity QED implementation of the discrete quantum Fourier transform  

E-Print Network [OSTI]

scheme relies on the passage of a series of suitably chosen atoms through a sequence of classical fields and high- Q cavities. The QFT maps each state ua& into a superposition given by NQFTua&5 1A2q (c50 2q21 e2piac/2 quc&, ~1! where q..., we therefore require q qubits to represent ua& . 1u1 j,0k&^1 j,0ku1eihu1 j,1k&^1 j,1ku, ~4! and since u0&^0u5(11sz)/2 and u1&^1u5(12sz)/2, Eq. ~4! has the matrix representation Qh511122 1 4 ~12e ih!~1112211sz22sz1121sz1sz2!. ~5! The discrete...

Scully, Marlan O.; Zubairy, M. Suhail

2002-01-01T23:59:59.000Z

289

Anomalies of discrete symmetries in various dimensions and group cohomology  

E-Print Network [OSTI]

We study 't Hooft anomalies for discrete global symmetries in bosonic theories in 2, 3 and 4 dimensions. We show that such anomalies may arise in gauge theories with topological terms in the action, if the total symmetry group is a nontrivial extension of the global symmetry by the gauge symmetry. Sometimes the 't Hooft anomaly for a d-dimensional theory with a global symmetry G can be canceled by anomaly inflow from a (d+1)-dimensional topological gauge theory with gauge group G. Such d-dimensional theories can live on the surfaces of Symmetry Protected Topological Phases. We also give examples of theories with more severe 't Hooft anomalies which cannot be canceled in this way.

Anton Kapustin; Ryan Thorngren

2014-04-16T23:59:59.000Z

290

A Mixed Finite-Element Discretization of the Energy-Transport Model for Semiconductors  

E-Print Network [OSTI]

A Mixed Finite-Element Discretization of the Energy-Transport Model for Semiconductors Stefan Holst #12;tting mixed #12;nite-element method is used to discretize the stationary energy. Energy-transport models describe the ow of electrons through a semi- conductor device, in uenced by di

Pietra, Paola

291

Some unusual discrete VLF emissions observed at a low-latitude ground station at Agra  

E-Print Network [OSTI]

Some unusual discrete VLF emissions observed at a low-latitude ground station at Agra B. Singh February 1997 / Accepted: 17 February 1997 Abstract. A detailed analysis of the VLF emissions data obtained°1¢ N, L = 1.15) has yielded some unusual discrete VLF emissions of the rising type. These include (1

Paris-Sud XI, Université de

292

Convergence of the Approximation Scheme to American Option Pricing via the Discrete Morse Semiflow  

SciTech Connect (OSTI)

We consider the approximation scheme to the American call option via the discrete Morse semiflow, which is a minimizing scheme of a time semi-discretized variational functional. In this paper we obtain a rate of convergence of approximate solutions and the convergence of approximate free boundaries. We mainly apply the theory of variational inequalities and that of viscosity solutions to prove our results.

Ishii, Katsuyuki, E-mail: ishii@maritime.kobe-u.ac.jp [Kobe University, Graduate School of Maritime Sciences (Japan); Omata, Seiro, E-mail: omata@kenroku.kanazawa-u.ac.jp [Kanazawa University, School of Mathematics and Physics, Institute of Science and Engineering (Japan)

2011-12-15T23:59:59.000Z

293

Discrete Barium Strontium Titanate (BST) Thin-Film Interdigital Varactors on Alumina: Design, Fabrication, Characterization, and  

E-Print Network [OSTI]

Discrete Barium Strontium Titanate (BST) Thin-Film Interdigital Varactors on Alumina: Design, Raleigh, NC-27695-7914, USA. Email:jayeshnath@ieee.org Abstract -- Discrete Barium Strontium Titanate (BST, capacitors, BST, ferroelectric, thin-film, barium strontium titanate, bandpass filter, IP3, ACPR, temperature

294

The construction of discretely conservative finite volume schemes that also globally conserve energy or entropy  

E-Print Network [OSTI]

for the dissipation of energy by the shock waves. These results are extended to systems of conservation laws that if the conservation law has an accompanying energy estimate, it should be possible to construct discrete schemes whichThe construction of discretely conservative finite volume schemes that also globally conserve

Stanford University

295

Area and Throughput Trade-Offs in the Design of Pipelined Discrete Wavelet Transform Architectures  

E-Print Network [OSTI]

Area and Throughput Trade-Offs in the Design of Pipelined Discrete Wavelet Transform Architectures wavelet transform (DWT) as a linear space-to-frequency transform of the image domain in an irreversible compression. This irreversible discrete wavelet transform is implemented by FIR filter using 9/7 Daubechies

Boyer, Edmond

296

Linear diffusion-wave channel routing using a discrete Hayami convolution method  

E-Print Network [OSTI]

method that neglects the acceleration terms, and the kinematic-wave method that neglects bothLinear diffusion-wave channel routing using a discrete Hayami convolution method Li Wang a, , Joan-in-Chief, with the assistance of Baxter E. Vieux, Associate Editor Keywords: Linear diffusion-wave channel routing Discrete

297

PARALLEL COMPUTATIONS OF RADIATIVE HEAT TRANSFER USING THE DISCRETE ORDINATES METHOD  

E-Print Network [OSTI]

the radiative transport equation on parallel computers. Mathematical libraries developed by third parties the discrete ordi- nates method. They observed that the global nature of radiative transport resultedPARALLEL COMPUTATIONS OF RADIATIVE HEAT TRANSFER USING THE DISCRETE ORDINATES METHOD Gautham

Utah, University of

298

Stability of discrete memory states to stochastic fluctuations in neuronal systems  

E-Print Network [OSTI]

endowed with feedback loops, for short-term memory. Fluctuations are due to highly irregular spike firing on an autophosphorylation mechanism of calcium/calmodulin-dependent protein kinase II CaMKII molecules. There, fluctuations in calcium concentration can lead to discrete changes in the number of ions bound to a protein5 and discrete

Wang, Xiao-Jing

299

Resonant plasmon scattering by discrete breathers in Josephson junction ladders A. E. Miroshnichenko,1  

E-Print Network [OSTI]

Resonant plasmon scattering by discrete breathers in Josephson junction ladders A. E scattering by discrete breathers in Josephson junction ladders. DOI: 10.1103/PhysRevB.71.174306 PACS number Josephson junction systems,2 coupled nonlinear optical waveguides,3 lattice vi- brations in crystals,4

Flach, Sergej

300

Resonant plasmon scattering by discrete breathers in Josephson junction ladders A. E. Miroshnichenko,1  

E-Print Network [OSTI]

Resonant plasmon scattering by discrete breathers in Josephson junction ladders A. E in Josephson junction ladders. We predict the existence of Fano resonances, and find them by computing in the plasmon scattering by discrete breathers in Josephson junction ladders. DOI: 10.1103/PhysRevB.71

Note: This page contains sample records for the topic "discrete atmospheric conditions" 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

Rank Tests for the Observability of Discrete-Time Jump Linear Systems with Inputs  

E-Print Network [OSTI]

Rank Tests for the Observability of Discrete-Time Jump Linear Systems with Inputs Ehsan Elhamifar of rank tests on the parameters of the JLS when the discrete state sequence is arbitrary. Our key verify observ- ability by checking a number of rank tests that is only quadratic in the number

302

Rapid gravity and gravity gradiometry terrain corrections via an adaptive quadtree mesh discretization  

E-Print Network [OSTI]

Rapid gravity and gravity gradiometry terrain corrections via an adaptive quadtree mesh discretization Kristofer Davis1,2 M. Andy Kass1 Yaoguo Li1 1 Center for Gravity, Electrical, and Magnetic Studies of gravity gradiometry surveys utilising an adaptive quadtree mesh discretization. The data- and terrain

303

Discrete ultrahigh-pressure domains in the Western Gneiss Region, Norway: implications for formation and exhumation  

E-Print Network [OSTI]

Discrete ultrahigh-pressure domains in the Western Gneiss Region, Norway: implications of Norway, Leiv Erikssons vei 39, 7491 Trondheim, Norway 4 Division of Geological and Planetary Sciences Ar ages within the Western Gneiss Region of Norway define three discrete ultrahigh-pressure (UHP

Hacker, Bradley R.

304

Friction dependence of shallow granular flows from discrete par-ticle simulations  

E-Print Network [OSTI]

Friction dependence of shallow granular flows from discrete par- ticle simulations Anthony Thornton relation for the macroscopic bed friction or basal roughness obtained from micro-scale discrete particle simulations of steady flows. We systematically vary the bed friction by changing the contact friction

Al Hanbali, Ahmad

305

Thermodynamics and phase transitions of electrolytes on lattices with different discretization parameters  

E-Print Network [OSTI]

Thermodynamics and phase transitions of electrolytes on lattices with different discretization February 2005; in final form 14 April 2005) Lattice models are crucial for studying thermodynamic thermodynamics and the nature of phase transitions in systems with charged particles. A discretization parameter

306

ORIGINAL PAPER A new discrete electromagnetism-based meta-heuristic  

E-Print Network [OSTI]

ORIGINAL PAPER A new discrete electromagnetism-based meta-heuristic for solving Electromagnetism-like Mechanism (SEM) is one of the swarm-based optimization methods which is examined Electromagnetism-like Mechanism is proposed which utilizes Genetic Algorithm (GA) operators to work in discrete

Li, Xiaodong

307

An Exposition of Structural Estimation of Discrete Dynamic Decision Processes1  

E-Print Network [OSTI]

An Exposition of Structural Estimation of Discrete Dynamic Decision Processes1 Bill Provencher, Springer 2005. 1 #12;An Exposition of Structural Estimation of Discrete Dynamic Decision Processes I economists directly employed their structural dynamic models in the pursuit of the positive question, What

Provencher, R. William

308

A New Approach to Fuzzy Modeling and Control of Discrete-Time Systems  

E-Print Network [OSTI]

], the advantage of fuzzy logic in modeling and control is in the ability to combine modeling (constructingA New Approach to Fuzzy Modeling and Control of Discrete-Time Systems Michael Margaliot and Gideon Langholz #3; Abstract We present a new approach to fuzzy modeling and control of discrete-time sys- tems

Margaliot, Michael

309

Discrete thermal element modelling of heat conduction in particle systems: Basic formulations  

E-Print Network [OSTI]

methodology, termed the discrete thermal element method (DTEM), for the effec- tive modelling of heat rights reserved. Keywords: Discrete thermal element method; Circular particle; Thermal contact; Heat conduction; Boundary (integral) equation/element 1. Introduction Heat transfer in particle systems can

Martin, Ralph R.

310

A Discrete Event Simulation Model for "Efficient Selection of Relay Vehicles for  

E-Print Network [OSTI]

1 A Discrete Event Simulation Model for "Efficient Selection of Relay Vehicles for Broadcasting discrete event-driven simulation model for DIB and EDIB protocols on VANET. We define six types of events the ACK message to the sender. The following variables are used in the simulation model: · vehs stores

Lin, Jason Yi-Bing

311

Nonlinear Schrodinger equations and their spectral semi-discretizations over long times  

E-Print Network [OSTI]

of a convolution potential avoids resonances among the frequencies (eigen- values) of the linearized systemNonlinear Schr¨odinger equations and their spectral semi-discretizations over long times Ludwig¨odinger equations with small initial data (or small nonlinearity) and their spec- tral semi-discretizations in space

Tübingen, Universität

312

CONDITIONS OF PURCHASE  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth7-1D: Vegetation Proposed New Substation Sites Proposed Route BTRICGEGR-N Goods PO 1 of 8 GE Global Research

313

CONDITIONS OF PURCHASE  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth7-1D: Vegetation Proposed New Substation Sites Proposed Route BTRICGEGR-N Goods PO 1 of 8 GE Global Researchof

314

Terms and Conditions  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear SecurityTensile Strain Switched Ferromagnetism in Layered NbS2 and NbSe2 . Tensile Strain SwitchedJ.Properties

315

Stability measurements of PPL atmospheric pressure arc  

SciTech Connect (OSTI)

Experiments on the stability of atmospheric pressure arcs have been started at PPL to understand and improve the performance of arc furnaces used for processing applications in metallurgy and hazardous waste treatment. Previous studies have suggested that the violent instabilities in such arcs may be due to kink modes. A 30 kW, 500 Amp CW DC experimental arc furnace was constructed with a graphite cathode and a molten steel anode. The arc plasma is diagnosed with 4000 frames/sec digital camera, Hall probes, and voltage and current monitors. Under certain conditions, the arc exhibits an intermittent helical instability, with the helix rotating at {approx}600 Hz. The nature of the instability is investigated. A possible instability mechanism is the self-magnetic field of the arc, with saturation occurring due to inhomogeneous heating in a helical arc. The effect of external DC and AC magnetic fields on the instability is investigated. Additionally, arc deflection due to external transverse magnetic field is investigated. The deflection angle is found to be proportional to the applied field, and is in good agreement with a simple model of the {rvec J} x {rvec b} force on the arc jet.

Roquemore, L.; Zweben, S.J. [Princeton Plasma Physics Lab., NJ (United States); Wurden, G.A. [Los Alamos National Lab., NM (United States)

1997-12-31T23:59:59.000Z

316

Regional forecasting with global atmospheric models; Final report  

SciTech Connect (OSTI)

The purpose of the project was to conduct model simulations for past and future climate change with respect to the proposed Yucca Mtn. repository. The authors report on three main topics, one of which is boundary conditions for paleo-hindcast studies. These conditions are necessary for the conduction of three to four model simulations. The boundary conditions have been prepared for future runs. The second topic is (a) comparing the atmospheric general circulation model (GCM) with observations and other GCMs; and (b) development of a better precipitation data base for the Yucca Mtn. region for comparisons with models. These tasks have been completed. The third topic is preliminary assessments of future climate change. Energy balance model (EBM) simulations suggest that the greenhouse effect will likely dominate climate change at Yucca Mtn. for the next 10,000 years. The EBM study should improve rational choice of GCM CO{sub 2} scenarios for future climate change.

Crowley, T.J.; Smith, N.R. [Applied Research Corp., College Station, TX (United States)

1994-05-01T23:59:59.000Z

317

atmospheric research community: Topics by E-print Network  

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

University Corporation for Atmospheric Research Geosciences Websites Summary: University Corporation for Atmospheric Research CIGNA DENTAL PREFERRED PROVIDER INSURANCE EFFECTIVE...

318

An Infrared Spectral Library for Atmospheric Environmental Monitoring...  

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

An Infrared Spectral Library for Atmospheric Environmental Monitoring. An Infrared Spectral Library for Atmospheric Environmental Monitoring. Abstract: Infrared (IR) spectroscopy...

319

Parallization of Stellar Atmosphere Codes  

E-Print Network [OSTI]

Parallel computing has turned out to be the enabling technology to solve complex physical systems. However, the transition from shared memory, vector computers to massively parallel, distributed memory systems and, recently, to hybrid systems poses new challenges to the scientist. We want to present a cook-book (with a very strong, personal bias) based on our experience with parallization of our existing codes. Some of the general tools and communication libraries are discussed. Our approach includes a mixture of algorithm, domain and physical module based parallization. The advantages, scalability and limitations of each are discussed at some examples. We want show that it becomes easier to write parallel code with increasing complexity of the physical problem making stellar atmosphere codes beyond the classical assumptions very suitable.

P. Hoeflich

2002-09-19T23:59:59.000Z

320

Conditional data watchpoint management  

DOE Patents [OSTI]

A method, system and computer program product for managing a conditional data watchpoint in a set of instructions being traced is shown in accordance with illustrative embodiments. In one particular embodiment, the method comprises initializing a conditional data watchpoint and determining the watchpoint has been encountered. Upon that determination, examining a current instruction context associated with the encountered watchpoint prior to completion of the current instruction execution, further determining a first action responsive to a positive context examination; otherwise, determining a second action.

Burdick, Dean Joseph (Austin, TX); Vaidyanathan, Basu (Austin, TX)

2010-08-24T23:59:59.000Z

Note: This page contains sample records for the topic "discrete atmospheric conditions" 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

Time dependences of atmospheric Carbon dioxide fluxes  

E-Print Network [OSTI]

Understanding the lifetime of CO2 in the atmosphere is critical for predictions regarding future climate changes. A simple mass conservation analysis presented here generates tight estimations for the atmosphere's retention time constant. The analysis uses a leaky integrator model that combines the observed deficit (only less than 40% of CO2 produced from combustion of fossil fuels is actually retained in the atmosphere, while more than 60% is continuously shed) with the exponential growth of fossil fuel burning. It reveals a maximum characteristic time of less than 23 year for the transfer of atmospheric CO2 to a segregation sink. This time constant is further constrained by the rapid disappearance of 14C after the ban of atmospheric atomic bomb tests, which provides a lower limit of 18 years for this transfer. The study also generates evaluations of other CO2 fluxes, exchange time constants and volumes exchanged. Analysis of large harmonic oscillations of atmospheric CO2 concentration, often neglected in th...

DeSalvo, Riccardo

2014-01-01T23:59:59.000Z

322

IPR Conditions, 25 January 2006 1 Intellectual Property Rights Conditions  

E-Print Network [OSTI]

IPR Conditions, 25 January 2006 1 Intellectual Property Rights Conditions for Collaborative Research Projects (IPR Conditions) I. GENERAL PRINCIPLES These rules should promote the protection guarantee the protection of the participants' intellectual assets. These IPR Conditions establish rules

De Cindio, Fiorella

323

12.815 Atmospheric Radiation, Fall 2005  

E-Print Network [OSTI]

Introduction to the physics of atmospheric radiation and remote sensing including use of computer codes. Radiative transfer equation including emission and scattering, spectroscopy, Mie theory, and numerical solutions. ...

Prinn, Ronald G.

324

Urban Atmospheres captures a unique, synergistic moment  

E-Print Network [OSTI]

Urban Atmospheres captures a unique, synergistic moment ­ expanding urban populations, rapid EDITORS Eric Paulos Intel Research eric@paulos.net Tom Jenkins Royal College of Art thomas

Paulos, Eric

325

Atmospheric and Surface Science Research Laboratory  

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

Atmospheric and Surface Science Research Laboratory Idaho National Laboratory (INL) researchers are contributing to the scientific understanding of contaminant transport through...

326

atmospheres: Topics by E-print Network  

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

to optical depth perturbations. In Earth-type atmospheres sustained planetary greenhouse effect with a stable ground surface temperature can only exist at a particular...

327

atmosphere: Topics by E-print Network  

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

to optical depth perturbations. In Earth-type atmospheres sustained planetary greenhouse effect with a stable ground surface temperature can only exist at a particular...

328

atmospherics: Topics by E-print Network  

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

to optical depth perturbations. In Earth-type atmospheres sustained planetary greenhouse effect with a stable ground surface temperature can only exist at a particular...

329

Discrete Event Modeling of Algae Cultivation and Harvesting at Commercial Scale: Capital Costs, Operating Costs, and System Bottlenecks  

SciTech Connect (OSTI)

Discrete Event Modeling of Algae Cultivation and Harvesting at Commercial Scale: Capital Costs, Operating Costs, and System Bottlenecks

Lacey, Ph.D, P.E., Ronald E. [Texas A& M University

2012-07-16T23:59:59.000Z

330

Response of global soil consumption of atmospheric methane to changes in atmospheric climate and nitrogen deposition  

E-Print Network [OSTI]

Soil consumption of atmospheric methane plays an important secondary role in regulating the atmospheric CH4 budget, next to the dominant loss mechanism involving reaction with the hydroxyl radical (OH). Here we used a ...

Zhuang, Qianlai

331

The plateau in mnemonic resolution across large set sizes indicates discrete resource limits in visual working memory  

E-Print Network [OSTI]

The plateau in mnemonic resolution across large set sizes indicates discrete resource limits, discrete-resource models, which assert a relatively small item limit for WM storage, predict that precision have been proposed to characterize the nature of capacity limits in WM. Discrete- resource models

Oregon, University of

332

Mineralogy under extreme conditions  

SciTech Connect (OSTI)

We have performed measurements of minerals based on the synchrotron source for single crystal and powder X-ray diffraction, inelastic scattering, spectroscopy and radiography by using diamond anvil cells. We investigated the properties of iron (Fe), iron-magnesium oxides (Fe, Mg)O, silica(SiO{sub 2}), iron-magnesium silicates (Fe, Mg)SiO{sub 3} under simulated high pressure-high temperature extreme conditions of the Earth's crust, upper mantle, low mantle, core-mantle boundary, outer core, and inner core. The results provide a new window on the investigation of the mineral properties at Earth's conditions.

Shu, Jinfu (CIW)

2012-02-07T23:59:59.000Z

333

Thermal Neutron Detectors with Discrete Anode Pad Readout  

SciTech Connect (OSTI)

A new two-dimensional thermal neutron detector concept that is capable of very high rates is being developed. It is based on neutron conversion in {sup 3}He in an ionization chamber (unity gas gain) that uses only a cathode and anode plane; there is no additional electrode such as a Frisch grid. The cathode is simply the entrance window, and the anode plane is composed of discrete pads, each with their own readout electronics implemented via application specific integrated circuits. The aim is to provide a new generation of detectors with key characteristics that are superior to existing techniques, such as higher count rate capability, better stability, lower sensitivity to background radiation, and more flexible geometries. Such capabilities will improve the performance of neutron scattering instruments at major neutron user facilities. In this paper, we report on progress with the development of a prototype device that has 48 x 48 anode pads and a sensitive area of 24cm x 24cm.

Yu,B.; Schaknowski, N.A., Smith, G.C., DeGeronimo, G., Vernon, E.O.

2008-10-19T23:59:59.000Z

334

Lossy compression of discrete sources via Viterbi algorithm  

E-Print Network [OSTI]

We present a new lossy compressor for discrete-valued sources. For coding a sequence $x^n$, the encoder starts by assigning a certain cost to each possible reconstruction sequence. It then finds the one that minimizes this cost and describes it losslessly to the decoder via a universal lossless compressor. The cost of each sequence is a linear combination of its distance from the sequence $x^n$ and a linear function of its $k^{\\rm th}$ order empirical distribution. The structure of the cost function allows the encoder to employ the Viterbi algorithm to recover the minimizer of the cost. We identify a choice of the coefficients comprising the linear function of the empirical distribution used in the cost function which ensures that the algorithm universally achieves the optimum rate-distortion performance of any stationary ergodic source in the limit of large $n$, provided that $k$ diverges as $o(\\log n)$. Iterative techniques for approximating the coefficients, which alleviate the computational burden of find...

Jalali, Shirin; Weissman, Tsachy

2010-01-01T23:59:59.000Z

335

Discreteness effects in cosmological N-body simulations  

E-Print Network [OSTI]

An estimate of the convergence radius of a simulated CDM halo is obtained under the assumption that the peak phase-space density in the system is set by discreteness effects that operate prior to relaxation. The predicted convergence radii are approximately a factor 2 larger than those estimated for numerical convergence studies. A toy model is used to study the formation of sheets of the cosmic web, from which DM haloes form later. This model demonstrates the interplay between phase mixing and violent relaxation that must also be characteristic of spherical collapse. In the limit that sheets contain arbitrarily many particles, it seems that power-law profiles are established in both distance and energy. When only a finite number of particles is employed, relaxation is prematurely terminated and the power laws are broken. In a given simulation, the sheets with the highest peak phase-space densities are those that form from the longest waves. Hence simulations with little small-scale power are expected to form the cuspiest haloes.

James Binney

2003-11-06T23:59:59.000Z

336

Some challenges of middle atmosphere data assimilation  

E-Print Network [OSTI]

Some challenges of middle atmosphere data assimilation 1234567 89A64BC7DEF72B4 8629EEC7C72DEEE5.1256/qj.05.87 Some challenges of middle atmosphere data assimilation By S. POLAVARAPU1,2, T. G. SHEPHERD2 Data assimilation is employed at operational weather forecast centres to combine measurements and model

Wirosoetisno, Djoko

337

OCEAN-ATMOSPHERE INTERACTION AND TROPICAL CLIMATE  

E-Print Network [OSTI]

radiation is the ultimate source of energy for motions in the atmosphere and ocean. Most absorption of solar radiation takes place on the Earth surface, the majority of which is occupied by oceans. Thus oceanic modulate surface radiative flux. Thus, the ocean and atmosphere are a coupled system and their interaction

Xie, Shang-Ping

338

Doctoral Programs Atmospheric, Oceanic & Space Sciences  

E-Print Network [OSTI]

University of Michigan Space Research Building 2455 Hayward Street Ann Arbor, MI 48109-2143 aoss Katherine E. White, Ann Arbor ©The Regents of the University of Michigan Research areas Atmospheric Science Atmospheric Dynamics Climate, Climate Modeling & Climate Change Clouds & Precipitation Paleoclimate, Ice

Eustice, Ryan

339

United States Department Atmospheric and Biospheric Interactions  

E-Print Network [OSTI]

United States Department Atmospheric and Biospheric Interactions of Agriculture Forest Service coordinator. 1997. Atmospheric and biospheric interactions of gases and energy in the Pacific region century have caused a dramatic increase in global air pollution. This process has accelerated in the past

Standiford, Richard B.

340

Atmospheric Chemistry, Modeling, and Biogeochemistry of Mercury  

E-Print Network [OSTI]

Atmospheric Chemistry, Modeling, and Biogeochemistry of Mercury Noelle Eckley Selin *Reprinted from Mercury in the Environment: Pattern and Process (Chapter 5) pp. 73-80 Copyright © 2012 with kind, and Biogeochemistry of Mercury NOELLE ECKLEY SELIN and their distribution in the atmosphere. This includes

Note: This page contains sample records for the topic "discrete atmospheric conditions" 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

Extremes and Atmospheric Data Eric Gilleland  

E-Print Network [OSTI]

Extremes and Atmospheric Data Eric Gilleland Research Applications Laboratory National Center for Atmospheric Research 2007-08 Program on Risk Analysis, Extreme Events and Decision Theory, opening workshop 16-19 September, North Carolina #12;Extremes · Interest in making inferences about large, rare, extreme phenomena

Gilleland, Eric

342

A discrete analogue of periodic delta Bose gas and affine Hecke algebra  

E-Print Network [OSTI]

We consider an eigenvalue problem for a discrete analogue of the Hamiltonian of the non-ideal Bose gas with delta-potentials on a circle. It is a two-parameter deformation of the discrete Hamiltonian for joint moments of the partition function of the O'Connell-Yor semi-discrete polymer. We construct the propagation operator by using integral-reflection operators, which give a representation of the affine Hecke algebra. We also construct eigenfunctions by means of the Bethe ansatz method.

Yoshihiro Takeyama

2014-03-12T23:59:59.000Z

343

A SEARCH FOR MAGNESIUM IN EUROPA'S ATMOSPHERE  

SciTech Connect (OSTI)

Europa's tenuous atmosphere results from sputtering of the surface. The trace element composition of its atmosphere is therefore related to the composition of Europa's surface. Magnesium salts are often invoked to explain Galileo Near Infrared Mapping Spectrometer spectra of Europa's surface, thus magnesium may be present in Europa's atmosphere. We have searched for magnesium emission in the Hubble Space Telescope Faint Object Spectrograph archival spectra of Europa's atmosphere. Magnesium was not detected and we calculate an upper limit on the magnesium column abundance. This upper limit indicates that either Europa's surface is depleted in magnesium relative to sodium and potassium, or magnesium is not sputtered as efficiently resulting in a relative depletion in its atmosphere.

Hoerst, S. M. [Cooperative Institute for Research in Environmental Sciences, University of Colorado-Boulder, Boulder, CO (United States); Brown, M. E., E-mail: sarah.horst@colorado.edu [Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA (United States)

2013-02-20T23:59:59.000Z

344

Chapter 9.1: Department of Atmospheric Science1 The Department of Atmospheric Science was founded in 1962 within the College of Engineering as  

E-Print Network [OSTI]

in first place among departments of atmosphere and ocean sciences in the nation. Strategic Planning Areas, or full professor levels) in atmospheric dynamics, climate dynamics, atmospheric radiation, atmospheric

345

ON THE EXISTENCE OF SHOCKS IN IRRADIATED EXOPLANETARY ATMOSPHERES  

SciTech Connect (OSTI)

Supersonic flows are expected to exist in the atmospheres of irradiated exoplanets, but the question of whether shocks develop lingers. Specifically, it reduces to whether continuous flow in a closed loop may become supersonic and if some portions of the supersonic flow steepen into shocks. We first demonstrate that continuous, supersonic flow may exist in two flavors: isentropic and non-isentropic, with shocks being included in the latter class of solutions. Supersonic flow is a necessary but insufficient condition for shocks to develop. The development of a shock requires the characteristics of neighboring points in a flow to intersect. We demonstrate that the intersection of characteristics may be quantified via the knowledge of the Mach number. Finally, we examine three-dimensional simulations of hot Jovian atmospheres and demonstrate that shock formation is expected to occur mostly on the dayside hemisphere, upstream of the substellar point, because the enhanced temperatures near the substellar point provide a natural pressure barrier for the returning flow. Understanding the role of shocks in irradiated exoplanetary atmospheres is relevant to correctly modeling observables such as the peak offsets of infrared phase curves.

Heng, Kevin [Institute for Astronomy, ETH Zuerich, Wolfgang-Pauli-Strasse 27, CH-8093 Zuerich (Switzerland)

2012-12-10T23:59:59.000Z

346

Images reveal that atmospheric particles can undergo liquid-liquid phase separations  

SciTech Connect (OSTI)

A large fraction of submicron atmospheric particles contains both organic material and inorganic salts. As the relative humidity cycles in the atmosphere, these mixed particles can undergo a range of phase transitions, possibly including liquid-liquid phase separation. If liquid-liquid phase separation occurs, the gas-particle partitioning of atmospheric semi-volatile organic compounds, the scattering and absorption of solar radiation, and the uptake of reactive gas species on atmospheric particles will be affected, with important implications for climate predictions. The actual occurrence of these types of phase transitions within individual atmospheric particles has been considered uncertain, in large part because of the absence of observations for real-world samples. Here, using optical and fluorescence microscopy, we observe the coexistence of two non-crystalline phases in particles generated from real-world samples collected on multiple days in Atlanta, Georgia, and in particles generated in the laboratory using atmospheric conditions. These results reveal that atmospheric particles can undergo liquid-liquid phase separations. Using a box model, we show that liquid-liquid phase separation can result in increased concentrations of gas-phase NO3 and N2O5 in the Atlanta region, due to decreased particle uptake of N2O5.

You, Yuan; Renbaum-Wolff, Lindsay; Carreras-Sospedra, Marc; Hanna, Sarah; Hiranuma, Naruki; Kamal, Saeid; Smith, Mackenzie L.; Zhang, Xiaolu; Weber, Rodney; Shilling, John E.; Dabdub, Donald; Martin, Scot T.; Bertram, Allan K.

2012-07-30T23:59:59.000Z

347

$N$-boson spectrum from a Discrete Scale Invariance  

E-Print Network [OSTI]

We present the analysis of the $N$-boson spectrum computed using a soft two-body potential the strength of which has been varied in order to cover an extended range of positive and negative values of the two-body scattering length $a$ close to the unitary limit. The spectrum shows a tree structure of two states, one shallow and one deep, attached to the ground-state of the system with one less particle. It is governed by an unique universal function, $\\Delta(\\xi)$, already known in the case of three bosons. In the three-particle system the angle $\\xi$, determined by the ratio of the two- and three-body binding energies $E_3/E_2=\\tan^2\\xi$, characterizes the Discrete Scale Invariance of the system. Extending the definition of the angle to the $N$-body system as $E_N/E_2=\\tan^2\\xi$, we study the $N$-boson spectrum in terms of this variable. The analysis of the results, obtained for up to $N=16$ bosons, allows us to extract a general formula for the energy levels of the system close to the unitary limit. Interestingly, a linear dependence of the universal function as a function of $N$ is observed at fixed values of $a$. We show that the finite-range nature of the calculations results in the range corrections that generate a shift of the linear relation between the scattering length $a$ and a particular form of the universal function. We also comment on the limits of applicability of the universal relations.

A. Kievsky; N. K. Timofeyuk; M. Gattobigio

2014-05-10T23:59:59.000Z

348

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

SciTech Connect (OSTI)

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

Höhn, Philipp A., E-mail: phoehn@perimeterinstitute.ca [Perimeter Institute for Theoretical Physics, 31 Caroline Street North, Waterloo, Ontario N2L 2Y5 (Canada)

2014-10-15T23:59:59.000Z

349

From Discrete Space-Time to Minkowski Space: Basic Mechanisms, Methods and Perspectives  

E-Print Network [OSTI]

This survey article reviews recent results on fermion system in discrete space-time and corresponding systems in Minkowski space. After a basic introduction to the discrete setting, we explain a mechanism of spontaneous symmetry breaking which leads to the emergence of a discrete causal structure. As methods to study the transition between discrete space-time and Minkowski space, we describe a lattice model for a static and isotropic space-time, outline the analysis of regularization tails of vacuum Dirac sea configurations, and introduce a Lorentz invariant action for the masses of the Dirac seas. We mention the method of the continuum limit, which allows to analyze interacting systems. Open problems are discussed.

Felix Finster

2008-02-22T23:59:59.000Z

350

Macroscopic behavior and discrete dynamo in high-[Theta] reversed-field pinch discharges  

SciTech Connect (OSTI)

The magnetohydrodynamic (MHD) activity and the discrete dynamo in high-[Theta] reversed-field pinch (RFP) discharges are studied through comparisons with those in normal-[Theta] RFP discharges, where [Theta]=[ital B][sub [theta

Arimoto, H.; Nakamura, A.; Sato, K.I.; Nagata, A.; Ando, T.; Kubota, S.; Masamune, S.; Nagatsu, M.; Tsukishima, T. (Plasma Science Center, Nagoya University, Chikusa-ku, Nagoya 464-01 (Japan))

1993-06-01T23:59:59.000Z

351

Matrix-F5 algorithms over finite-precision complete discrete valuation fields  

E-Print Network [OSTI]

Matrix-F5 algorithms over finite-precision complete discrete valuation fields Tristan Vaccon that are purely over K, instead of methods over K to solve problems over Q or Fp. Following the works of Taylor

Boyer, Edmond

352

Room-Temperature Gas Sensing Based on Electron Transfer between Discrete Tin Oxide Nanocrystals and  

E-Print Network [OSTI]

Room-Temperature Gas Sensing Based on Electron Transfer between Discrete Tin Oxide Nanocrystals and the response time. Rutile-structured tin oxide (SnO2) is an n-type semiconducting material widely used in gas

Chen, Junhong

353

A comparison of time-discretization/linearization approaches for the incompressible NavierStokes equations  

E-Print Network [OSTI]

.g., in the simulation of crystal growth [1] or of fuel cells [2]. The numerical solution of the time-dependent Navier results. Even for the two-dimen- sional laminar regime, the question of an optimal discretization approach

John, Volker

354

FREQUENCY IMPLEMENTATION OF DISCRETE WAVELET TRANSFORMS FiC. Tayand J.P Havlicek  

E-Print Network [OSTI]

FREQUENCY IMPLEMENTATION OF DISCRETE WAVELET TRANSFORMS FiC. Tayand J.P Havlicek School of Electrical and ComputerEngineering University of Oklahoma,Norman, OK USA Peter.C.Tay

Havlicek, Joebob

355

Global Consensus for Discrete-time Multi-Agent Systems with Input Saturation Constraints  

E-Print Network [OSTI]

; Yu, Chen, and Cao, 2010; Yang, Roy, Wan, and Saberi, 2011; Seyboth, Dimarogonas, and Johansson, 2013; Grip, Yang, Saberi, and Stoorvogel, 2012). The studies on the discrete-time case are rather limited

Dimarogonas, Dimos

356

A LARGE SCALE CONTINUUM-DISCRETE NUMERICAL MODELLING: APPLICATION TO OVERBURDEN DAMAGE OF A SALT CAVERN  

E-Print Network [OSTI]

CAVERN SOULEY Mountaka1 , MERCERAT Diego2 , DRIAD-LEBEAU Lynda1 , BERNARD Pascal2 1 INERIS, Ecole des collapse). KEYWORDS: cavern, numerical modelling, continuum-discrete, overburden, damage. RĂ?SUMĂ?: Dans l

Boyer, Edmond

357

Lattice discretization effects on the critical parameters of model nonpolar and polar fluids  

E-Print Network [OSTI]

Lattice discretization effects on the critical parameters of model nonpolar and polar fluids Sarvin Moghaddam Department of Chemical Engineering, University of Maryland, College Park, Maryland 20742 Athanassios Z. Panagiotopoulosa) Department of Chemical Engineering, Princeton University, Princeton, New

358

DISCRETIZED CONFIGURATIONS AND PARTIAL AARON ABRAMS, DAVID GAY, AND VALERIE HOWER  

E-Print Network [OSTI]

DISCRETIZED CONFIGURATIONS AND PARTIAL PARTITIONS AARON ABRAMS, DAVID GAY, AND VALERIE HOWER to have the homotopy type of a wedge of spheres [2]. 1 #12;2 AARON ABRAMS, DAVID GAY, AND VALERIE HOWER

Abrams, Aaron

359

Math 309 Introduction to Proof in Discrete Mathematics Summer 2014 Instructor Amites Sarkar  

E-Print Network [OSTI]

Math 309 Introduction to Proof in Discrete Mathematics Summer 2014 Instructor Amites Sarkar Text, in 216 Bond Hall. My phone number is 650 7569 and my e-mail is amites.sarkar@wwu.edu #12;

Sarkar, Amites

360

2D/3D Discrete Duality Finite Volume Scheme (DDFV) applied to ECG simulation.  

E-Print Network [OSTI]

2D/3D Discrete Duality Finite Volume Scheme (DDFV) applied to ECG simulation. DDFV scheme part, the method is used for the resolution of a problem arising in bio-mathematics: the ECG

Coudière, Yves

Note: This page contains sample records for the topic "discrete atmospheric conditions" 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

Discretization of continuous ECG based risk metrics using asymmetric and warped entropy measures  

E-Print Network [OSTI]

We investigate several entropy based approaches to finding cut points for discretizing continuous ECG-based risk metrics. We describe two existing approaches, Shannon entropy and asymmetric entropy, and one new approach, ...

Singh, Anima

362

Effects of atmospheric conditions and control surface deflections on vortex characteristics  

E-Print Network [OSTI]

7, SST Ci'rcorde, C-SA, and others, induce 'tr. ailing r, ing iiI! vor'-ic, s ?aiich pr: sent a hazard Lo stnal1er ait craft. In this Itir!Osti(dation such vr. i tex charac'ieristics as I!ave Fornations, r;0!e Ienrgths, b(eak t&1es, and vortex...''1(is r! ' 0 . L'I' I i I 21, I r'. . r ot' j(IS Ls I'rtn(. 'cst b'r'('1';s OLCLII'I'0 I 11r!01 ' 'I; ' rlr'rr. 'X:' ". :: ":I, '. L '. I'Il . IrI rI(:cray occurred in aparoximately 1/2 the time of a si. -iilsr vortex ! nduced ;. i th ~ head...

Shenkir, Calvin Edward

2012-06-07T23:59:59.000Z

363

E-Print Network 3.0 - atmosphere conditions-an interdisciplinary...  

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

Sciences and Ecology ; Geosciences 2 Nitrogen Cycling in the Earth's System (Biol 544 and SoilS 544; 3 credits, Fall 2011, MWF 8:10-9 am; Johnson 204) Summary: of Sciences,...

364

An investigation of the atmospheric physical conditions associated with microwave propagation  

E-Print Network [OSTI]

of Dopartasat) Jsauary 1958 I 4 8 I t/0 C 5 I I 1 I'I u I' t ! I I I II III I The ?riter ?ishes to ackno?ledge the kind assistaace of all the nonhero of tbe gadar Meteorology Seccion of chs Depart?ant of Oceanography and Meteorology in tha... bees foesos4 saisly es ?bat e4ght bs tarss4 wsisgla ysth yroysgacios. " This ayyrosob ~- ylatsly fails is oossi4srstioa sf eoa4itioss else?hers Aas ia ths Lsse4iaco ares or is chs yath ower ?hiah the obserwscioss sro ?a4e. sloe siecle ro4iosos4s...

Riggs, Lowell Pogue

2012-06-07T23:59:59.000Z

365

Leaf water potential in Pinus taeda L. as related to fluctuating soil water and atmospheric conditions  

E-Print Network [OSTI]

growing on Bienville loamy fine sand near Rusk, Texas. The average available water storage capacity was 9. 50 inches in the 8-foot profile. Siruiltaneous measurements of leaf water potential and environmental variables were made weekly at two hour... pressure 2 deficit, temperature, and wind (R 0. 78). A regression equation relating total daily water stress to only vapor pressure deficit and soil water content in the 0- to 4-foot soil layer was also signifi- 2= cant (R = 0. 76). The total daily...

Ellison, Stanley Lee

1969-01-01T23:59:59.000Z

366

High voltage pulse conditioning  

DOE Patents [OSTI]

Apparatus for conditioning high voltage pulses from particle accelerators in order to shorten the rise times of the pulses. Flashover switches in the cathode stalk of the transmission line hold off conduction for a determinable period of time, reflecting the early portion of the pulses. Diodes upstream of the switches divert energy into the magnetic and electrostatic storage of the capacitance and inductance inherent to the transmission line until the switches close.

Springfield, Ray M. (Sante Fe, NM); Wheat, Jr., Robert M. (Los Alamos, NM)

1990-01-01T23:59:59.000Z

367

Fuel gas conditioning process  

DOE Patents [OSTI]

A process for conditioning natural gas containing C.sub.3+ hydrocarbons and/or acid gas, so that it can be used as combustion fuel to run gas-powered equipment, including compressors, in the gas field or the gas processing plant. Compared with prior art processes, the invention creates lesser quantities of low-pressure gas per unit volume of fuel gas produced. Optionally, the process can also produce an NGL product.

Lokhandwala, Kaaeid A. (Union City, CA)

2000-01-01T23:59:59.000Z

368

Discrete Sampling Test Plan for the 200-BP-5 Operable Unit  

SciTech Connect (OSTI)

The Discrete Groundwater Sampling Project is conducted by the Pacific Northwest National Laboratory (PNNL) on behalf of CH2M HILL Plateau Remediation Company. The project is focused on delivering groundwater samples from proscribed horizons within select groundwater wells residing in the 200-BP-5 Operable Unit (200-BP-5 OU) on the Hanford Site. This document provides the scope, schedule, methodology, and other details of the PNNL discrete sampling effort.

Sweeney, Mark D.

2010-02-04T23:59:59.000Z

369

Discrete and continuous exponential transforms of simple Lie groups of rank two  

E-Print Network [OSTI]

We develop and describe continuous and discrete transforms of class functions on compact simple Lie group $G$ as their expansions into series of uncommon special functions, called here $\\E$-functions in recognition of the fact that the functions generalize common exponential functions. The rank of $G$ is the number of variables in the $\\E$-functions. A uniform discretization of the decomposition problem is described on lattices of any density and symmetry admissible for the Lie group $G$.

Iryna Kashuba; Jiri Patera

2007-02-05T23:59:59.000Z

370

Effects of ethanol on evoked unit activity in discrete layers of the hippocampus in rabbits  

E-Print Network [OSTI]

EFFECTS OF ETHANOL ON EVOKED UNIT ACTIVITY IN DISCRETE LAYERS OF THE HIPPOCAMPUS IN RABBITS A Thesis by NILLIAM RAY FOLGER Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirement for the degree... of MASTER OF SCIENCE December 1976 Major Subject: Biology EFFECTS OF ETHANOL ON EVOKED UNIT ACTIVITY IN DISCRETE LAYERS OF THE HIPPOCAMPUS IN RABBITS A Thesis by WILLIAM RAY FOLGER Approved as to style and content by: W. R. Klemm Chairman...

Folger, William Ray

1976-01-01T23:59:59.000Z

371

Time Step Sensitivity of Nonlinear Atmospheric Models: Numerical Convergence, Truncation Error Growth, and Ensemble Design  

E-Print Network [OSTI]

1973; Oran and Boris 1987; Murray 1989; Gershenfeld 1999). Weather and climate prediction models, which to the initial conditions, which is a major source of uncertainty in Numerical Weather Prediction (NWP; eTime Step Sensitivity of Nonlinear Atmospheric Models: Numerical Convergence, Truncation Error

Judd, Kevin

372

Effect of atmosphere change paths on the induced chemical expansion Valentin O.  

E-Print Network [OSTI]

and the steady-state stress distribution in a membrane reactor for partial oxidation of methane (POM) have been simulated in various conditions. The stress field depends on the atmosphere change history. The calculation and reducing side. At membrane reactor scale these chemo- mechanical stresses affect the mechanical reliability

Boyer, Edmond

373

Atmospheric Environment 36 (2002) 51855196 FTIR measurements of functional groups and organic mass in  

E-Print Network [OSTI]

the National Center for Atmospheric Research C-130 aircraft during the passing efficiency of a low, with higher Al/Ca ratios in the boundary layer. Organic compounds were present in high and low dust conditions or may condense onto pre- existing particles. Partly as a result of this vapor-to- particle conversion

Russell, Lynn

374

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

SciTech Connect (OSTI)

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

Höhn, Philipp A., E-mail: phoehn@perimeterinstitute.ca [Perimeter Institute for Theoretical Physics, 31 Caroline Street North, Waterloo, Ontario N2L 2Y5 (Canada)

2014-08-15T23:59:59.000Z

375

Conditions of Employment Modern Apprentice  

E-Print Network [OSTI]

Conditions of Employment Modern Apprentice 1. GENERAL CONDITIONS Members of staff are subject. Modern Apprentices are required under this agreement to undertake training, attend courses and carry out

Strathclyde, University of

376

Space Science: Atmospheres Evolution of planets  

E-Print Network [OSTI]

;Atmospheres / Evolution Heat Sources Compressional Energy Trapped Radioactive Material Tidal Interactions, same A) the surface temperature,Tg, increases. WOW! Simple #12;Temperature vs. time in an Early Epoch

Johnson, Robert E.

377

The porous atmosphere of eta Carinae  

E-Print Network [OSTI]

We analyze the wind generated by the great 20 year long super-Eddington outburst of eta-Carinae. We show that using classical stellar atmospheres and winds theory, it is impossible to construct a consistent wind model in which a sufficiently small amount of mass, like the one observed, is shed. One expects the super-Eddington luminosity to drive a thick wind with a mass loss rate substantially higher than the observed one. The easiest way to resolve the inconsistency is if we alleviate the implicit notion that atmospheres are homogeneous. An inhomogeneous atmosphere, or "porous", allows more radiation to escape while exerting a smaller average force. Consequently, such an atmosphere yields a considerably lower mass loss rate for the same total luminosity. Moreover, all the applications of the Eddington Luminosity as a strict luminosity limit should be revised, or at least reanalyzed carefully.

Nir J. Shaviv

2000-02-09T23:59:59.000Z

378

Azores Global Atmosphere Monitoring Complex 1. INTRODUCTION  

E-Print Network [OSTI]

to the accuracy of European weather forecasts. Today, they provide a unique base for studies of atmospheric levels. Measurements in the free troposphere (FT) are particularly useful, because trace gas and particle

Honrath, Richard E.

379

Adaptive control for Mars atmospheric flight  

E-Print Network [OSTI]

landing accuracy requirements for a manned space vehicle make it necessary to ?y a controlled entry trajectory rather than a more robust ballistic entry trajectory used for some robotic missions. The large variations in Mars atmospheric properties make a...

Restrepo, Carolina Isabel

2009-05-15T23:59:59.000Z

380

Atomic Force and Scanning Electron Microscopy of Atmospheric Particles  

E-Print Network [OSTI]

conducted so as to characterize atmospheric aerosols from anthropogenic (pollution) and natural (sea saltAtomic Force and Scanning Electron Microscopy of Atmospheric Particles ZAHAVA BARKAY,1 * AMIT 69978, Israel KEY WORDS atmospheric aerosols; atomic force microscopy; scanning electron microscopy

Shapira, Yoram

Note: This page contains sample records for the topic "discrete atmospheric conditions" 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

Adjoint modeling for atmospheric pollution process sensitivity at regional scale  

E-Print Network [OSTI]

Adjoint modeling for atmospheric pollution process sensitivity at regional scale Laurent Menut; 0345 Atmospheric Composition and Structure: Pollution--urban and regional (0305); 3210 Mathematical: atmospheric pollution, tropospheric ozone, urban pollution peaks, adjoint modeling, sensitivity Citation

Menut, Laurent

382

Computer aided analysis and synthesis for discrete robust control systems  

E-Print Network [OSTI]

necessary and sufficient conditions to check the stability of a real linear interval control system described by the polytopic family of characteristic polynomials [ ] Where the Qi(z) are fixed and the Pi(z) are interval polynomial, i = 1, 2, 3......... n...

Setijawan, Bambang

1994-01-01T23:59:59.000Z

383

Air Activation Following an Atmospheric Explosion  

SciTech Connect (OSTI)

In addition to thermal radiation and fission products, nuclear explosions result in a very high flux of unfissioned neutrons. Within an atmospheric nuclear explosion, these neutrons can activate the various elemental components of natural air, potentially adding to the radioactive signature of the event as a whole. The goal of this work is to make an order-of-magnitude estimate of the total amount of air activation products that can result from an atmospheric nuclear explosion.

Lowrey, Justin D.; McIntyre, Justin I.; Prichard, Andrew W.; Gesh, Christopher J.

2013-03-13T23:59:59.000Z

384

Atmospheric State, Cloud Microphysics and Radiative Flux  

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

Atmospheric thermodynamics, cloud properties, radiative fluxes and radiative heating rates for the ARM Southern Great Plains (SGP) site. The data represent a characterization of the physical state of the atmospheric column compiled on a five-minute temporal and 90m vertical grid. Sources for this information include raw measurements, cloud property and radiative retrievals, retrievals and derived variables from other third-party sources, and radiative calculations using the derived quantities.

Mace, Gerald

385

CO oxidation trends on Pt-group metals from ultrahigh vacuum to near atmospheric pressures: A combined in situ PM-IRAS and reaction kinetics study  

E-Print Network [OSTI]

oxidation Polarization modulation Infrared reflection absorption spectroscopy Reaction kinetics a b s t rCO oxidation trends on Pt-group metals from ultrahigh vacuum to near atmospheric pressures3 Torr) and near atmospheric (1­102 Torr) pressures in a batch reactor under steady-state conditions

Goodman, Wayne

386

Sea ice loss and the changing atmospheric CO2 uptake capacity of the Arctic Ocean: Insights1 from the southeastern Canada Basin2  

E-Print Network [OSTI]

Sea ice loss and the changing atmospheric CO2 uptake capacity of the Arctic Ocean: Insights1 from (Arctic Ocean) to act as an atmospheric CO2 sink under the summertime ice-free conditions12 expected in the near future. Beneath a heavily decayed ice cover, we found surprisingly high13 pCO2sw (~290-320 atm

Paris-Sud XI, Université de

387

Comparative Analysis of Urban Atmospheric Aerosol by Particle...  

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

Analysis of Urban Atmospheric Aerosol by Particle-Induced X-ray Emission (PIXE), Proton Elastic Scattering Analysis Comparative Analysis of Urban Atmospheric Aerosol by...

388

atmospheric dispersion coefficient: Topics by E-print Network  

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

the earth surface. In general, the atmospheric motion is driven by the intense solar energy arriving at the equator 3 A GIS-based atmospheric dispersion model Computer...

389

atmospheric dispersion calculations: Topics by E-print Network  

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

the earth surface. In general, the atmospheric motion is driven by the intense solar energy arriving at the equator 4 A GIS-based atmospheric dispersion model Computer...

390

atmospheric dispersion experiment: Topics by E-print Network  

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

the earth surface. In general, the atmospheric motion is driven by the intense solar energy arriving at the equator 2 A GIS-based atmospheric dispersion model Computer...

391

atmospheric ion measurements: Topics by E-print Network  

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

the Atmospheric CERN Preprints Summary: We report the first observation in a high energy neutrino telescope of cascades induced by atmospheric electron neutrinos and by...

392

Atmospheric Solids Analysis Probe Mass Spectrometry: A New Approach...  

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

Atmospheric Solids Analysis Probe Mass Spectrometry: A New Approach for Airborne Particle Analysis. Atmospheric Solids Analysis Probe Mass Spectrometry: A New Approach for Airborne...

393

Fehner and Gosling, Atmospheric Nuclear Weapons Testing, 1951...  

Energy Savers [EERE]

Atmospheric Nuclear Weapons Testing, 1951-1963. Battlefield of the Cold War: The Nevada Test Site, Volume I Fehner and Gosling, Atmospheric Nuclear Weapons Testing, 1951-1963....

394

An Infrared Spectral Library for Atmospheric Environmental Monitoring...  

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

Library for Atmospheric Environmental Monitoring. An Infrared Spectral Library for Atmospheric Environmental Monitoring. Abstract: Infrared (IR) spectroscopy is one of several...

395

atmospheric pressure ionization: Topics by E-print Network  

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

for Atmospheric Pressure, in Vivo, and Imaging Mass. For example, atmospheric pressure infrared MALDI (AP IR-MALDI), capable of producing ions from small ionization (DESI),5...

396

Oxygen detected in atmosphere of Saturn's moon Dione  

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

Oxygen detected in atmosphere of Saturn's moon Dione Oxygen detected in atmosphere of Saturn's moon Dione Scientists and an international research team have announced discovery of...

397

A Volcanologist'S Review Of Atmospheric Hazards Of Volcanic Activity...  

Open Energy Info (EERE)

atmospheric hazards caused by explosive volcanic activity. The hazard posed by fine silicate ash with long residence time in the atmosphere is probably much less serious than...

398

atmospheric co2 content: Topics by E-print Network  

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

Of Physics Version 4 Gerlich and Ralf D. Tscheuschner Abstract The atmospheric greenhouse effect, an idea that many authors Of The Atmospheric CO2 Greenhouse Effects . . . 3...

399

atmospheric sciences exposure: Topics by E-print Network  

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

annual reviews of faculty performance in accordance 8 Space Science : Atmosphere Greenhouse Effect Physics Websites Summary: Space Science : Atmosphere Greenhouse Effect Part-5a...

400

atmospheric co2 concentrations: Topics by E-print Network  

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

Of Physics Version 4 Gerlich and Ralf D. Tscheuschner Abstract The atmospheric greenhouse effect, an idea that many authors Of The Atmospheric CO2 Greenhouse Effects . . . 3...

Note: This page contains sample records for the topic "discrete atmospheric conditions" 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

atmospheric co2 concentration: Topics by E-print Network  

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

Of Physics Version 4 Gerlich and Ralf D. Tscheuschner Abstract The atmospheric greenhouse effect, an idea that many authors Of The Atmospheric CO2 Greenhouse Effects . . . 3...

402

atmospheric loading effects: Topics by E-print Network  

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

large solar proton Paris-Sud XI, Universit de 7 Space Science : Atmosphere Greenhouse Effect Physics Websites Summary: Space Science : Atmosphere Greenhouse Effect Part-5a...

403

atmospheric co2 measurements: Topics by E-print Network  

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

Of Physics Version 4 Gerlich and Ralf D. Tscheuschner Abstract The atmospheric greenhouse effect, an idea that many authors Of The Atmospheric CO2 Greenhouse Effects . . . 3...

404

atmospheric co2 variations: Topics by E-print Network  

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

Of Physics Version 4 Gerlich and Ralf D. Tscheuschner Abstract The atmospheric greenhouse effect, an idea that many authors Of The Atmospheric CO2 Greenhouse Effects . . . 3...

405

atmospheric sciences: Topics by E-print Network  

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

annual reviews of faculty performance in accordance 8 Space Science : Atmosphere Greenhouse Effect Physics Websites Summary: Space Science : Atmosphere Greenhouse Effect Part-5a...

406

atmospheric co2 mixing: Topics by E-print Network  

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

Of Physics Version 4 Gerlich and Ralf D. Tscheuschner Abstract The atmospheric greenhouse effect, an idea that many authors Of The Atmospheric CO2 Greenhouse Effects . . . 3...

407

atmospheric aerosols basic: Topics by E-print Network  

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

of atmospheric aerosol. Aplin, KL 2012-01-01 13 1. Introduction The atmospheric greenhouse effect is the basic mechanism Environmental Sciences and Ecology Websites Summary: 1....

408

Conditional sterility in plants  

DOE Patents [OSTI]

The present disclosure provides methods, recombinant DNA molecules, recombinant host cells containing the DNA molecules, and transgenic plant cells, plant tissue and plants which contain and express at least one antisense or interference RNA specific for a thiamine biosynthetic coding sequence or a thiamine binding protein or a thiamine-degrading protein, wherein the RNA or thiamine binding protein is expressed under the regulatory control of a transcription regulatory sequence which directs expression in male and/or female reproductive tissue. These transgenic plants are conditionally sterile; i.e., they are fertile only in the presence of exogenous thiamine. Such plants are especially appropriate for use in the seed industry or in the environment, for example, for use in revegetation of contaminated soils or phytoremediation, especially when those transgenic plants also contain and express one or more chimeric genes which confer resistance to contaminants.

Meagher, Richard B. (Athens, GA); McKinney, Elizabeth (Athens, GA); Kim, Tehryung (Taejeon, KR)

2010-02-23T23:59:59.000Z

409

Initial Cladding Condition  

SciTech Connect (OSTI)

The purpose of this analysis is to describe the condition of commercial Zircaloy clad fuel as it is received at the Yucca Mountain Project (YMP) site. Most commercial nuclear fuel is encased in Zircaloy cladding. This analysis is developed to describe cladding degradation from the expected failure modes. This includes reactor operation impacts including incipient failures, potential degradation after reactor operation during spent fuel storage in pool and dry storage and impacts due to transportation. Degradation modes include cladding creep, and delayed hydride cracking during dry storage and transportation. Mechanical stresses from fuel handling and transportation vibrations are also included. This Analysis and Model Report (AMR) does not address any potential damage to assemblies that might occur at the YMP surface facilities. Ranges and uncertainties have been defined. This analysis will be the initial boundary condition for the analysis of cladding degradation inside the repository. In accordance with AP-2.13Q, ''Technical Product Development Planning'', a work plan (CRWMS M&O 2000c) was developed, issued, and utilized in the preparation of this document. There are constraints, caveats and limitations to this analysis. This cladding degradation analysis is based on commercial Pressurized Water Reactor (PWR) fuel with Zircaloy cladding but is applicable to Boiling Water Reactor (BWR) fuel. Reactor operating experience for both PWRs and BWRs is used to establish fuel reliability from reactor operation. It is limited to fuel exposed to normal operation and anticipated operational occurrences (i.e. events which are anticipated to occur within a reactor lifetime), and not to fuel that has been exposed to severe accidents. Fuel burnup projections have been limited to the current commercial reactor licensing environment with restrictions on fuel enrichment, oxide coating thickness and rod plenum pressures. The information provided in this analysis will be used in evaluating the post-closure performance of the Monitored Geologic Repository (MGR) in relation to waste form degradation.

E. Siegmann

2000-08-22T23:59:59.000Z

410

The medieval metal industry was the cradle of modern large-scale atmospheric lead pollution in northern Europe  

SciTech Connect (OSTI)

There is great concern for contamination of sensitive ecosystems in high latitudes by long-range transport of heavy metals and other pollutants derived from industrial areas in lower latitudes. Atmospheric pollution of heavy metals has a very long history, and since metals accumulate in the environment, understanding of present-day pollution conditions requires knowledge of past atmospheric deposition. The authors use analyses of lead concentrations and stable lead isotopes ({sup 206}Pb/{sup 207}Pb ratios) of annually laminated sediments from four lakes in northern Sweden to provide a decadal record of atmospheric lead pollution for the last 3000 years. There is a clear signal in the sediments of airborne pollution from Greek and Roman cultures 2000 years ago, followed by a period of clean conditions 400--900 A.D. From 900 A.D. there was a conspicuous, permanent increase in atmospheric lead pollution fallout, The sediments reveal peaks in atmospheric lead pollution at 1200 and 1530 A.D. comparable to present-day levels. These peaks match the history of metal production in Europe. This study indicates that the contemporary atmospheric pollution climate in northern Europe was established in Medieval time, rather than in the industrial period. Atmospheric lead pollution deposition did not, when seen in a historical perspective, increase as much as usually assumed with the Industrial Revolution.

Braennvall, M.L.; Bindler, R.; Renberg, I.; Emteryd, O.; Bartnicki, J.; Billstroem, K.

1999-12-15T23:59:59.000Z

411

Inverse scattering transform for the focusing nonlinear Schrödinger equation with nonzero boundary conditions  

SciTech Connect (OSTI)

The inverse scattering transform for the focusing nonlinear Schrödinger equation with non-zero boundary conditions at infinity is presented, including the determination of the analyticity of the scattering eigenfunctions, the introduction of the appropriate Riemann surface and uniformization variable, the symmetries, discrete spectrum, asymptotics, trace formulae and the so-called theta condition, and the formulation of the inverse problem in terms of a Riemann-Hilbert problem. In addition, the general behavior of the soliton solutions is discussed, as well as the reductions to all special cases previously discussed in the literature.

Biondini, Gino [Department of Mathematics, State University of New York at Buffalo, Buffalo, New York 14260 (United States)] [Department of Mathematics, State University of New York at Buffalo, Buffalo, New York 14260 (United States); Kova?i?, Gregor [Department of Mathematical Sciences, Rensselaer Polytechnic Institute, Troy, New York 12180 (United States)] [Department of Mathematical Sciences, Rensselaer Polytechnic Institute, Troy, New York 12180 (United States)

2014-03-15T23:59:59.000Z

412

Using high-order methods on adaptively refined block-structured meshes - discretizations, interpolations, and filters.  

SciTech Connect (OSTI)

Block-structured adaptively refined meshes (SAMR) strive for efficient resolution of partial differential equations (PDEs) solved on large computational domains by clustering mesh points only where required by large gradients. Previous work has indicated that fourth-order convergence can be achieved on such meshes by using a suitable combination of high-order discretizations, interpolations, and filters and can deliver significant computational savings over conventional second-order methods at engineering error tolerances. In this paper, we explore the interactions between the errors introduced by discretizations, interpolations and filters. We develop general expressions for high-order discretizations, interpolations, and filters, in multiple dimensions, using a Fourier approach, facilitating the high-order SAMR implementation. We derive a formulation for the necessary interpolation order for given discretization and derivative orders. We also illustrate this order relationship empirically using one and two-dimensional model problems on refined meshes. We study the observed increase in accuracy with increasing interpolation order. We also examine the empirically observed order of convergence, as the effective resolution of the mesh is increased by successively adding levels of refinement, with different orders of discretization, interpolation, or filtering.

Ray, Jaideep; Lefantzi, Sophia; Najm, Habib N.; Kennedy, Christopher A.

2006-01-01T23:59:59.000Z

413

Importance of Design Conditions for Sizing Air-Conditioning Plant  

E-Print Network [OSTI]

. The proposed design conditions specific to the location and the application are drastically different than currently used single design conditions for all application and locations. Cooling load estimates fro two building located in Kuwait have been analyzed...

Shaban, N.; Maheshwari, G. P.; Suri, R. K.

2000-01-01T23:59:59.000Z

414

Semiclassical energy conditions and wormholes  

E-Print Network [OSTI]

We consider the nonlinear energy conditions and their quantum extensions. These new energy conditions behave much better than the usual pointwise energy conditions in the presence of semiclassical quantum effects. Analogous quantum extensions for the linear energy conditions are not always satisfied as one enters the quantum realm, but they can be used to constrain the violation of the classical conditions. Thus, the existence of wormholes supported by a fluid which violates the null energy condition in a controlled way is of particular interest.

Prado Martin-Moruno

2014-11-17T23:59:59.000Z

415

Atmospheric chemistry impacts and feedbacks on the global carbon cycle  

E-Print Network [OSTI]

prediction. Issues to be addressed include the quantification of the impact of the atmospheric oxidation and the oxidative state of the atmosphere. The end goal is to create a model that can quantitatively predict is required to: Predict 3-D atmospheric CO2 production as a function of the CCSM3 atmospheric chemistry module

416

New nonlinear mechanisms of midlatitude atmospheric low-frequency variability  

E-Print Network [OSTI]

and Atmospheric Research Utrecht, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands Abstract

417

Atmospheric Pressure Plasma Process And Applications  

SciTech Connect (OSTI)

This paper provides a general discussion of atmospheric-pressure plasma generation, processes, and applications. There are two distinct categories of atmospheric-pressure plasmas: thermal and nonthermal. Thermal atmospheric-pressure plasmas include those produced in high intensity arcs, plasma torches, or in high intensity, high frequency discharges. Although nonthermal plasmas are at room temperatures, they are extremely effective in producing activated species, e.g., free radicals and excited state atoms. Thus, both thermal and nonthermal atmosphericpressure plasmas are finding applications in a wide variety of industrial processes, e.g. waste destruction, material recovery, extractive metallurgy, powder synthesis, and energy conversion. A brief discussion of recent plasma technology research and development activities at the Idaho National Laboratory is included.

Peter C. Kong; Myrtle

2006-09-01T23:59:59.000Z

418

Magnetized Atmospheres around Accreting Neutron Stars  

E-Print Network [OSTI]

We present a detailed investigation of atmospheres around accreting neutron stars with high magnetic field ($B\\gtrsim 10^{12}$ G) and low luminosity ($L\\lesssim 10^{33}$ erg/s). We compute the atmospheric structure, intensity and emergent spectrum for a plane-parallel, pure hydrogen medium by solving the transfer equations for the normal modes coupled to the hydrostatic and energy balance equations. The hard tail found in previous investigations for accreting, non-magnetic neutron stars with comparable luminosity is suppressed and the X-ray spectrum, although still harder than a blackbody at the star effective temperature, is nearly planckian in shape. Spectra from accreting atmospheres, both with high and low fields, are found to exhibit a significant excess at optical wavelengths above the Rayleigh-Jeans tail of the X-ray continuum.

S. Zane; R. Turolla; A. Treves

2000-02-01T23:59:59.000Z

419

Comparison of discrete and continuous thermal neutron scattering treatments in MCNP5  

SciTech Connect (OSTI)

The standard discrete thermal neutron S({alpha},{beta}) scattering treatment in MCNP5 is compared with a continuous S({alpha},{beta}) scattering treatment using a criticality suite of 119 benchmark cases and ENDF/B-VII.0 nuclear data. In the analysis, six bound isotopes are considered: beryllium metal, graphite, hydrogen in water, hydrogen in polyethylene, beryllium in beryllium oxide and oxygen in beryllium oxide. Overall, there are only small changes in the eigenvalue (k{sub eff}) between discrete and continuous treatments. In the comparison of 64 cases that utilize S({alpha},{beta}) scattering, 62 agreed at the 95% confidence level, and the 2 cases with differences larger than 3 {sigma} agreed within 1 {sigma} when more neutrons were run in the calculations. The results indicate that the changes in eigenvalue between continuous and discrete treatments are random, small, and well within the uncertainty of measured data for reactor criticality experiments. (authors)

Pavlou, A. T. [Univ. of Michigan, Dept. of Nuclear Engineering and Radiological Sciences, 2355 Bonisteel Boulevard, Ann Arbor, MI 48109 (United States); Brown, F. B. [Los Alamos National Laboratory, Monte Carlo Codes Group, MS A143, PO Box 1663, Los Alamos, NM 87545 (United States); Martin, W. R. [Univ. of Michigan, Dept. of Nuclear Engineering and Radiological Sciences, 2355 Bonisteel Boulevard, Ann Arbor, MI 48109 (United States); Kiedrowski, B. C. [Los Alamos National Laboratory, Monte Carlo Codes Group, MS A143, PO Box 1663, Los Alamos, NM 87545 (United States)

2012-07-01T23:59:59.000Z

420

A Community Atmosphere Model with Superparameterized Clouds  

SciTech Connect (OSTI)

In 1999, National Center for Atmospheric Research (NCAR) scientists Wojciech Grabowski and Piotr Smolarkiewicz created a "multiscale" atmospheric model in which the physical processes associated with clouds were represented by running a simple high-resolution model within each grid column of a lowresolution global model. In idealized experiments, they found that the multiscale model produced promising simulations of organized tropical convection, which other models had struggled to produce. Inspired by their results, Colorado State University (CSU) scientists Marat Khairoutdinov and David Randall created a multiscale version of the Community Atmosphere Model (CAM). They removed the cloud parameterizations of the CAM, and replaced them with Khairoutdinov's high-resolution cloud model. They dubbed the embedded cloud model a "super-parameterization," and the modified CAM is now called the "SP-CAM." Over the next several years, many scientists, from many institutions, have explored the ability of the SP-CAM to simulate tropical weather systems, the day-night changes of precipitation, the Asian and African monsoons, and a number of other climate processes. Cristiana Stan of the Center for Ocean-Land-Atmosphere Interactions found that the SP-CAM gives improved results when coupled to an ocean model, and follow-on studies have explored the SP-CAM's utility when used as the atmospheric component of the Community Earth System Model. Much of this research has been performed under the auspices of the Center for Multiscale Modeling of Atmospheric Processes, a National Science Foundation (NSF) Science and Technology Center for which the lead institution is CSU.

Randall, David; Branson, Mark; Wang, Minghuai; Ghan, Steven J.; Craig, Cheryl; Gettelman, A.; Edwards, Jim

2013-06-18T23:59:59.000Z

Note: This page contains sample records for the topic "discrete atmospheric conditions" 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

Calibration of LSST Instrumental and Atmospheric Photometric Passbands  

SciTech Connect (OSTI)

The Large Synoptic Survey Telescope (LSST) will continuously image the entire sky visible from Cerro Pachon in northern Chile every 3-4 nights throughout the year. The LSST will provide data for a broad range of science investigations that require better than 1% photometric precision across the sky (repeatability and uniformity) and a similar accuracy of measured broadband color. The fast and persistent cadence of the LSST survey will significantly improve the temporal sampling rate with which celestial events and motions are tracked. To achieve these goals, and to optimally utilize the observing calendar, it will be necessary to obtain excellent photometric calibration of data taken over a wide range of observing conditions - even those not normally considered 'photometric'. To achieve this it will be necessary to routinely and accurately measure the full optical passband that includes the atmosphere as well as the instrumental telescope and camera system. The LSST mountain facility will include a new monochromatic dome illumination projector system to measure the detailed wavelength dependence of the instrumental passband for each channel in the system. The facility will also include an auxiliary spectroscopic telescope dedicated to measurement of atmospheric transparency at all locations in the sky during LSST observing. In this paper, we describe these systems and present laboratory and observational data that illustrate their performance.

Burke, David L.; /SLAC; Axelrod, T.; /Arizona U., Astron. Dept. - Steward Observ.; Barrau, Aurelien; Baumont, Sylvain; /LPSC, Grenoble; Blondin, Stephane; /Marseille, CPPM; Claver, Chuck; /NOAO, Tucson; Gorecki, Alexia; /LPSC, Grenoble; Ivezic, Zeljko; Jones, Lynne; /Washington U., Seattle, Astron. Dept.; Krabbendam, Victor; Liang, Ming; Saha, Abhijit; /NOAO, Tucson; Smith, Allyn; /Austin Peay State U.; Smith, R.Chris; /Cerro-Tololo InterAmerican Obs.; Stubbs, Christopher W.; /Harvard-Smithsonian Ctr. Astrophys.

2011-07-06T23:59:59.000Z

422

Controlled atmosphere for fabrication of cermet electrodes  

DOE Patents [OSTI]

A process is disclosed for making an inert electrode composite wherein a metal oxide and a metal are reacted in a gaseous atmosphere at an elevated temperature of at least about 750 C. The metal oxide is at least one of the nickel, iron, tin, zinc and zirconium oxides and the metal is copper, silver, a mixture of copper and silver or a copper-silver alloy. The gaseous atmosphere has an oxygen content that is controlled at about 5--3000 ppm in order to obtain a desired composition in the resulting composite. 2 figs.

Ray, S.P.; Woods, R.W.

1998-08-11T23:59:59.000Z

423

Controlled atmosphere for fabrication of cermet electrodes  

DOE Patents [OSTI]

A process for making an inert electrode composite wherein a metal oxide and a metal are reacted in a gaseous atmosphere at an elevated temperature of at least about 750.degree. C. The metal oxide is at least one of the nickel, iron, tin, zinc and zirconium oxides and the metal is copper, silver, a mixture of copper and silver or a copper-silver alloy. The gaseous atmosphere has an oxygen content that is controlled at about 5-3000 ppm in order to obtain a desired composition in the resulting composite.

Ray, Siba P. (Murrysville, PA); Woods, Robert W. (New Kensington, PA)

1998-01-01T23:59:59.000Z

424

The Atmospheric Radiation Measurement Program Video  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear SecurityTensile Strain Switched Ferromagnetism in Layered NbS2 and NbSe2 .2004The Atmospheric Radiation Measurement

425

DOCTORAL TRAINING GRANT (DTG) SCHEME TERMS AND CONDITIONS A Doctoral Training Grant (DTG) is a grant paid by a Research Council to a Research  

E-Print Network [OSTI]

DOCTORAL TRAINING GRANT (DTG) SCHEME TERMS AND CONDITIONS A Doctoral Training Grant (DTG. Doctoral Training Grants aim to: · assist the Research Organisation to attract the best people into postgraduate research and training; · allow a maximum of local discretion in managing and organising doctoral

426

Condition Monitoring System for Reinforced  

E-Print Network [OSTI]

containing dissolved ionic species such as chlorides. Since concrete is a porous material, with timeCondition Monitoring System for Reinforced Concrete Structures PROBLEM THIS TECHNOLOGY SOLVES: Patent pending concrete condition monitoring system providing `real-time' information on temperature

Painter, Kevin

427

Phenomena of oscillations in atmospheric pressure direct current glow discharges  

SciTech Connect (OSTI)

Self-sustained oscillations in a dc glow discharge with a semiconductor layer at atmospheric pressure were investigated by means of a one-dimensional fluid model. It is found that the dc glow discharge initially becomes unstable in the subnormal glow region and gives rise to oscillations of plasma parameters. A variety of oscillations with one or more frequencies have been observed under different conditions. The discharge oscillates between the glow discharge mode and the Townsend discharge mode in the oscillations with large amplitude while operates in the subnormal glow discharge mode all the while in the oscillations with small amplitude. Fourier Transform spectra of oscillations reveal the transition mechanism between different oscillations. The effects of semiconductor conductivity on the oscillation frequency of the dominant mode, gas voltage, as well as the discharge current have also been analyzed.

Liu, Fu-cheng [College of Physics Science and Technology, Hebei University, Baoding 071002 (China)] [College of Physics Science and Technology, Hebei University, Baoding 071002 (China); Yan, Wen; Wang, De-zhen [School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024 (China)] [School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024 (China)

2013-12-15T23:59:59.000Z

428

An advanced open-path atmospheric pollution monitor for large areas  

SciTech Connect (OSTI)

Large amounts of toxic waste materials, generated in manufacturing fuel for nuclear reactors, are stored in tanks buried over large areas at DOE sites. Flammable and hazardous gases are continually generated by chemical reactions in the waste materials. To prevent explosive concentrations of these gases, the gases are automatically vented to the atmosphere when the pressure exceeds a preset value. Real-time monitoring of the atmosphere above the tanks with automatic alarming is needed to prevent exposing workers to unsafe conditions when venting occurs. This project is to design, develop, and test an atmospheric pollution monitor which can measure concentrations of DOE-specified and EPA-specified hazardous gases over ranges as long as 4km. A CO{sub 2} laser to measure absorption spectra and to determine the distance over which the measurements are made, is combined with an acousto-optic tunable filter (AOTF) to measure thermal emission spectra.

Taylor, L.

1995-12-31T23:59:59.000Z

429

Atmospheric and Wake Turbulence Impacts on Wind Turbine Fatigue Loading: Preprint  

SciTech Connect (OSTI)

Large-eddy simulations of atmospheric boundary layers under various stability and surface roughness conditions are performed to investigate the turbulence impact on wind turbines. In particular, the aeroelastic responses of the turbines are studied to characterize the fatigue loading of the turbulence present in the boundary layer and in the wake of the turbines. Two utility-scale 5 MW turbines that are separated by seven rotor diameters are placed in a 3 km by 3 km by 1 km domain. They are subjected to atmospheric turbulent boundary layer flow and data is collected on the structural response of the turbine components. The surface roughness was found to increase the fatigue loads while the atmospheric instability had a small influence. Furthermore, the downstream turbines yielded higher fatigue loads indicating that the turbulent wakes generated from the upstream turbines have significant impact.

Lee, S.; Churchfield, M.; Moriarty, P.; Jonkman, J.; Michalakes, J.

2011-12-01T23:59:59.000Z

430

Clathrate hydrates as a sink of noble gases in Titan's atmosphere  

E-Print Network [OSTI]

We use a statistical thermodynamic approach to determine the composition of clathrate hydrates which may form from a multiple compound gas whose composition is similar to that of Titan's atmosphere. Assuming that noble gases are initially present in this gas phase, we calculate the ratios of xenon, krypton and argon to species trapped in clathrate hydrates. We find that these ratios calculated for xenon and krypton are several orders of magnitude higher than in the coexisting gas at temperature and pressure conditions close to those of Titan's present atmosphere at ground level. Furthermore we show that, by contrast, argon is poorly trapped in these ices. This trapping mechanism implies that the gas-phase is progressively depleted in xenon and krypton when the coexisting clathrate hydrates form whereas the initial abundance of argon remains almost constant. Our results are thus compatible with the deficiency of Titan's atmosphere in xenon and krypton measured by the {\\it Huygens} probe during its descent on J...

Thomas, C; Ballenegger, V; Picaud, Sylvain

2007-01-01T23:59:59.000Z

431

Energy conditions and their implications  

E-Print Network [OSTI]

Energy conditions and their implications Matt Visser Physics Department Washington University Saint;#16;s (Los Alamos) Midwest Relativity 9 November 1999. #12; Abstract: The energy conditions of general- itational #12;elds and cosmological geometries. However, the energy conditions are beginning to look a lot

Visser, Matt

432

Twilight for the energy conditions?  

E-Print Network [OSTI]

Twilight for the energy conditions? Matt Visser Physics Department Washington University Saint;#16;s (CAB, Madrid) Marcel Grossmann 9 Roma July 2000 #12; Abstract: The energy conditions of general relativity per- mit one to deduce very powerful and general theorems. However, the energy conditions are now

Visser, Matt

433

DISCRETE ELEMENT MODELING OF BLADE–STRIKE FREQUENCY AND SURVIVAL OF FISH PASSING THROUGH HYDROKINETIC TURBINES  

SciTech Connect (OSTI)

Evaluating the consequences from blade-strike of fish on marine hydrokinetic (MHK) turbine blades is essential for incorporating environmental objectives into the integral optimization of machine performance. For instance, experience with conventional hydroelectric turbines has shown that innovative shaping of the blade and other machine components can lead to improved designs that generate more power without increased impacts to fish and other aquatic life. In this work, we used unsteady computational fluid dynamics (CFD) simulations of turbine flow and discrete element modeling (DEM) of particle motion to estimate the frequency and severity of collisions between a horizontal axis MHK tidal energy device and drifting aquatic organisms or debris. Two metrics are determined with the method: the strike frequency and survival rate estimate. To illustrate the procedure step-by-step, an exemplary case of a simple runner model was run and compared against a probabilistic model widely used for strike frequency evaluation. The results for the exemplary case showed a strong correlation between the two approaches. In the application case of the MHK turbine flow, turbulent flow was modeled using detached eddy simulation (DES) in conjunction with a full moving rotor at full scale. The CFD simulated power and thrust were satisfactorily comparable to experimental results conducted in a water tunnel on a reduced scaled (1:8.7) version of the turbine design. A cloud of DEM particles was injected into the domain to simulate fish or debris that were entrained into the turbine flow. The strike frequency was the ratio of the count of colliding particles to the crossing sample size. The fish length and approaching velocity were test conditions in the simulations of the MHK turbine. Comparisons showed that DEM-based frequencies tend to be greater than previous results from Lagrangian particles and probabilistic models, mostly because the DEM scheme accounts for both the geometric aspects of the passage event ---which the probabilistic method does--- as well as the fluid-particle interactions ---which the Lagrangian particle method does. The DEM-based survival rates were comparable to laboratory results for small fish but not for mid-size fish because of the considerably different turbine diameters. The modeling framework can be used for applications that aim at evaluating the biological performance of MHK turbine units during the design phase and to provide information to regulatory agencies needed for the environmental permitting process.

Romero Gomez, Pedro DJ; Richmond, Marshall C.

2014-04-17T23:59:59.000Z

434

Connectivity To Atmospheric Release Advisory Capability  

Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

To establish DOE and NNSA connectivity to Atmospheric Release Advisory Capability (ARAC) for sites and facilities that have the potential for releasing hazardous materials sufficient to generate certain emergency declarations and to promote efficient use of resources for consequence assessment activities at DOE sites, facilities, operations, and activities in planning for and responding to emergency events. No cancellations.

2001-02-26T23:59:59.000Z

435

Exploring the Deep... Ocean-Atmosphere  

E-Print Network [OSTI]

Climate oscillations 97 #12;Storing energy To understand how solar radiation affects large-scale processes), and biosphere (living organisms) that are driven by solar energy. The ocean and the atmosphere have the greatest on the others. To fully understand the dynamics of our climate, we must examine the global energy balance

Wright, Dawn Jeannine

436

Atmospheric Data Package for the Composite Analysis  

SciTech Connect (OSTI)

The purpose of this data package is to summarize our conceptual understanding of atmospheric transport and deposition, describe how this understanding will be simplified for numerical simulation as part of the Composite Analysis (i.e., implementation model), and finally to provide the input parameters needed for the simulations.

Napier, Bruce A.; Ramsdell, James V.

2005-09-01T23:59:59.000Z

437

THE LOWER SOLAR ATMOSPHERE ROBERT J. RUTTEN  

E-Print Network [OSTI]

THE LOWER SOLAR ATMOSPHERE ROBERT J. RUTTEN Sterrekundig Instituut, Postbus 80 000, NL­3508 TA, Utrecht, The Netherlands Abstract. This "rapporteur" report discusses the solar photosphere and low does not seem to jeopardize precise determination of solar abundances in classical fashion. It is still

Rutten, Rob

438

MIDDLE ATMOSPHERE DYNAMICS ATS 708 (3 credits)  

E-Print Network [OSTI]

Academic Integrity Policy as found in the General Catalog (http://www.catalog.colostate.edu/FrontPDF/1, 1987, Andrews, Holton, Leovy, Academic Press. · Atmospheric and Oceanic Fluid Dynamics, 2006, Vallis Articles (alphabetically): · Baldwin et al., 2001: The quasi-biennial oscillation. Rev. Geophys., 39, 1979

439

MIDDLE ATMOSPHERE DYNAMICS AT707 (3 credits)  

E-Print Network [OSTI]

., Holton, J. R., Leovy, C. B., Academic Press, 489 pp. · Atmospheric and Oceanic Fluid Dynamics, 2006 Review Articles: · Haynes, P. H., 2005: Stratospheric Dynamics. Annu. Rev. Fluid Mech., 37, 263­ 293­Dobson Circulation, Residual (Diabatic) Circulations 7.1 Discovery 7.2 Eliassen's Balanced Response to a Mechanical

440

Analysis methods for Atmospheric Cerenkov Telescopes  

E-Print Network [OSTI]

Three different analysis techniques for Atmospheric Imaging System are presented. The classical Hillas parameters based technique is shown to be robust and efficient, but more elaborate techniques can improve the sensitivity of the analysis. A comparison of the different analysis techniques shows that they use different information for gamma-hadron separation, and that it is possible to combine their qualities.

Mathieu de Naurois

2006-07-12T23:59:59.000Z

Note: This page contains sample records for the topic "discrete atmospheric conditions" 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

TETTERSTO NATURE Pre-industrial atmospheric  

E-Print Network [OSTI]

, starting with the Greek and Roman cultures3'4.The cumulative deposition from anthropogenicsourcesin preTETTERSTO NATURE Pre-industrial atmospheric lead contamination detected in Swedish lake sediments for pre-industrial atmospherictrace-metalcontaminationt''it is commonlyassumed that air pollution

Short, Daniel

442

Microlensing Effects in Atmospheres of Substars  

E-Print Network [OSTI]

The purpose of the present work is the study of focusing properties of atmospheres of substars that is necessary for adequate interpreting of observational data and for solving the inverse problem consisting in recovery parameters of 'microlenses' (substars) and sources (quasars). Amplification factor for a quasar image as projected onto the field of microlenses-substars was computed for optical and radio wavelengths.

L. A. Berdina; A. A. Minakov

2007-12-10T23:59:59.000Z

443

Propagation of strangelets in the Earth's atmosphere  

E-Print Network [OSTI]

A new model for the description of the behaviour of strangelets in the Earth's atmosphere is presented. Strangelet fission induced by collision with air nuclei is included. It is shown that strangelets with certain parameters of initial mass and energy may reach depths near sea level, which can be examined by ground-based experiments.

Fei Wu; Ren-Xin Xu; Bo-Qiang Ma

2007-02-13T23:59:59.000Z

444

White Dwarf Spectra and Atmosphere Models  

E-Print Network [OSTI]

We describe the spectral classification of white dwarfs and some of the physical processes important for their understanding. In the major part of this paper we discuss the input physics and computational methods for one of the most widely used stellar atmosphere codes for white dwarfs.

Detlev Koester

2008-12-02T23:59:59.000Z

445

1999 Gordon Research Conference on Atmospheric Chemistry  

SciTech Connect (OSTI)

The Gordon Research Conference (GRC) on Atmospheric Chemistry was held at Salve Regina University in Newport, Rhode Island, June 13-18, 1999. The conference was well attended with 151 participants. The attendees represented the spectrum of endeavor in this field coming from academia, industry, and government laboratories, both US and foreign scientists, senior researchers, young investigators, and students.

Storm, C.

2000-08-01T23:59:59.000Z

446

Atmospheric dispersion in mountain valleys and basins  

SciTech Connect (OSTI)

The primary goal of the research is to further characterize and understand dispersion in valley and basin atmospheres. A secondary, and related goal, is to identify and understand the dominant physical processes governing this dispersion. This has been accomplished through a review of the current literature, and analyses of recently collected data from two field experiments. This work should contribute to an improved understanding of material transport in the atmospheric boundary layer. It was found that dispersion in a freely draining valley (Brush Creek valley, CO) atmosphere is much greater than in an enclosed basin (Roanoke, VA) atmosphere primarily because of the greater wind speeds moving past the release point and the greater turbulence levels. The development of a cold air pool in the Roanoke basin is the dominant process governing nighttime dispersion in the basin, while the nighttime dispersion in the Brush Creek valley is dominated by turbulent diffusion and plume confinement between the valley sidewalls. The interaction between valley flows and above ridgetops flows is investigated. A ventilation rate'' of material transport between the valley and above ridgetop flows is determined. This is important in regional air pollution modeling and global climate modeling. A simple model of dispersion in valleys, applicable through a diurnal cycle, is proposed.

Allwine, K.J.

1992-01-01T23:59:59.000Z

447

Atmospheric dispersion in mountain valleys and basins  

SciTech Connect (OSTI)

The primary goal of the research is to further characterize and understand dispersion in valley and basin atmospheres. A secondary, and related goal, is to identify and understand the dominant physical processes governing this dispersion. This has been accomplished through a review of the current literature, and analyses of recently collected data from two field experiments. This work should contribute to an improved understanding of material transport in the atmospheric boundary layer. It was found that dispersion in a freely draining valley (Brush Creek valley, CO) atmosphere is much greater than in an enclosed basin (Roanoke, VA) atmosphere primarily because of the greater wind speeds moving past the release point and the greater turbulence levels. The development of a cold air pool in the Roanoke basin is the dominant process governing nighttime dispersion in the basin, while the nighttime dispersion in the Brush Creek valley is dominated by turbulent diffusion and plume confinement between the valley sidewalls. The interaction between valley flows and above ridgetops flows is investigated. A ``ventilation rate`` of material transport between the valley and above ridgetop flows is determined. This is important in regional air pollution modeling and global climate modeling. A simple model of dispersion in valleys, applicable through a diurnal cycle, is proposed.

Allwine, K.J.

1992-01-01T23:59:59.000Z

448

JournalofGeophysicalResearch: Atmospheres RESEARCH ARTICLE  

E-Print Network [OSTI]

convection to start from more levels · Simple modification of convective parameterization Correspondence to of the Community Atmosphere Model (CAM4), we show that the overall accuracy in the diurnal simulation of convective rise to diurnal cycles in cloud amount [May et al., 2012] and relative humidity [Soden, 2000] which

Folkins, Ian

449

Cooperative Institute for Research in the Atmosphere  

E-Print Network [OSTI]

#12;2 Cooperative Institute for Research in the Atmosphere Contents 3 Heavy Snowfall regulations designed to elimi- nate human-caused haze in Big Bend and 155 other National Parks), and the Electric Power Research Institute (EPRI), among others. In support of BRAVO, NPS and CIRA scientists

Collett Jr., Jeffrey L.

450

AT 715 (2 Credits) Atmospheric Oxidation Processes  

E-Print Network [OSTI]

: 1. Develop an understanding of kinetic and equilibrium aspects of important chemical pathways, Journal of Geophysical Research, Atmospheric Chemis- try and Physics (on-line), Journal of the Air: reactions of isoprene oxidation products. Environ. Sci. Tech. 40, 4956-4960. #12;

451

Doctoral Programs Atmospheric, Oceanic & Space Sciences  

E-Print Network [OSTI]

Professor; Recipient, Teaching Innovation Prize; Michigan Distinguished Professor of the Year Allison Mission to Comet 67P / Churyumov- Gerasimenko · Solar and Heliospheric Physics Group · STEREO Mission,OceanicandSpaceSciences Atmospheric, Oceanic & Space Sciences University of Michigan Space Research Building 2455 Hayward Street Ann

Eustice, Ryan

452

Land and Atmospheric Science GRAD STUDENT HANDBOOK  

E-Print Network [OSTI]

, transport, and fate of pollutants in soil, air, and water; improving and protecting land, air, and water, Policy and Management Agricultural Industries and Marketing The Department occupies the entire Soil are predominantly occupied by Soil Morphology and Genesis, Environmental Biophysics, and Atmospheric Sciences, plus

Minnesota, University of

453

Sommerfeld radiation condition at threshold  

E-Print Network [OSTI]

We prove Besov space bounds of the resolvent at low energies in any dimension for a class of potentials that are negative and obey a virial condition with these conditions imposed at infinity only. We do not require spherical symmetry. The class of potentials includes in dimension $\\geq3$ the attractive Coulomb potential. There are two boundary values of the resolvent at zero energy which we characterize by radiation conditions. These radiation conditions are zero energy versions of the well-known Sommerfeld radiation condition.

Erik Skibsted

2011-06-23T23:59:59.000Z

454

Atmospheric Circulation and Tides of "51Peg b-like" Planets  

E-Print Network [OSTI]

We examine the properties of the atmospheres of extrasolar giant planets at orbital distances smaller than 0.1 AU from their stars. We show that these ``51Peg b-like'' planets are rapidly synchronized by tidal interactions, but that small departures from synchronous rotation can occur because of fluid-dynamical torques within these planets. Previous radiative-transfer and evolution models of such planets assume a homogeneous atmosphere. Nevertheless, we show using simple arguments that, at the photosphere, the day-night temperature difference and characteristic wind speeds may reach ~500 K and ~2 km/s, respectively. Substantial departures from chemical equilibrium are expected. The cloud coverage depends sensitively on the dynamics; clouds could exist predominantly either on the dayside or nightside, depending on the circulation regime. Radiative-transfer models that assume homogeneous conditions are therefore inadequate in describing the atmospheric properties of 51Peg b-like planets. We present preliminary three-dimensional, nonlinear simulations of the atmospheric circulation of HD209458b that indicate plausible patterns for the circulation and generally agree with our simpler estimates. Furthermore, we show that kinetic energy production in the atmosphere can lead to the deposition of substantial energy in the interior, with crucial consequences for the evolution of these planets. Future measurements of reflected and thermally-emitted radiation from these planets will help test our ideas.

Adam P. Showman; Tristan Guillot

2002-02-12T23:59:59.000Z

455

A discrete particle approach to simulate the combined effect of blast and sand impact loading of steel plates  

E-Print Network [OSTI]

A discrete particle approach to simulate the combined effect of blast and sand impact loading March 2011 Keywords: Blast loads Experimental tests Sand ejecta Discrete particles Numerical simulations a b s t r a c t The structural response of a stainless steel plate subjected to the combined blast

Wadley, Haydn

456

H Gain Scheduling for Discrete-Time Systems with Control Delays and Time-Varying Parameters: a BMI Approach  

E-Print Network [OSTI]

H Gain Scheduling for Discrete-Time Systems with Control Delays and Time-Varying Parameters: a BMI. By using a memory at the feedback loop, a discrete gain scheduled controller which minimizes an upper bound, there is no denying the fact that gain scheduling has represented an important issue within control system theory [1

457

DISCRETE AND CONTINUOUS doi:10.3934/dcds.2014.34.1099 DYNAMICAL SYSTEMS  

E-Print Network [OSTI]

, energy method. This research was supported by the Marsden Fund of the Royal Society of New Zealand 2014 pp. 1099­1104 DISCRETE GRADIENT METHODS HAVE AN ENERGY CONSERVATION LAW Robert I. Mc. W. Quispel Department of Mathematics and Statistics La Trobe University, Melbourne, VIC 3086

McLachlan, Robert

458

Mathematical Geology, Vol. 34, No. 1, January 2002 ( C 2002) On Modelling Discrete Geological Structures  

E-Print Network [OSTI]

Mathematical Geology, Vol. 34, No. 1, January 2002 ( C 2002) On Modelling Discrete Geological there is a large amount of missing observations, which often is the case in geological applications. We make,predictions,MarkovchainMonteCarlo,simulatedannealing,incomplete observations. INTRODUCTION In many geological applications, there is an interest in predicting properties

Baran, Sándor

459

A New Incompressibility Discretization for a Hybrid Particle MAC Grid Representation with Surface Tension  

E-Print Network [OSTI]

implicit surface tension for our novel hybrid discretization, we demonstrate preliminary results for both. Surface tension forces exacerbate the situation by imposing a strict t = O(x3/2 ) time step restriction formulation of surface tension by looking at the changes of curvature over time. This was simplified in [26

Fedkiw, Ron

460

Discrete Mathematics 233 (2001) 175182 www.elsevier.com/locate/disc  

E-Print Network [OSTI]

Discrete Mathematics 233 (2001) 175­182 www.elsevier.com/locate/disc Some remarks on cycles on cycles of graphs and directed graphs of the following form: `Does there exist a set of cycles with a property P that generates all the cycles by operation O?'. c 2001 Published by Elsevier Science B.V. 1

Matamala, MartĂ­n

Note: This page contains sample records for the topic "discrete atmospheric conditions" 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.


461

-transform MATLAB Laboratory Experiment Purpose: This experiment presents the frequency domain analysis of discrete-time  

E-Print Network [OSTI]

5.6 -transform MATLAB Laboratory Experiment Purpose: This experiment presents the frequency domain analysis of discrete-time systems using MATLAB. The impulse, step, sinusoidal, and exponential on the ¡ -transform. In addition, MATLAB will be used to perform the partial fraction expansion and to find

Gajic, Zoran

462

OPTIMAL RELIABILITY ALLOCATION IN SERIES-PARALLEL SYSTEMS FROM COMPONENTS' DISCRETE COST -RELIABILITY DATA SETS  

E-Print Network [OSTI]

OPTIMAL RELIABILITY ALLOCATION IN SERIES-PARALLEL SYSTEMS FROM COMPONENTS' DISCRETE COST - RELIABILITY DATA SETS: A NESTED SIMULATED ANNEALING APPROACH Subba Rao V. Majety# , Srikanth It is generally accepted that a component's cost is an increasing function of its reliability. Most researchers

Smith, Alice E.

463

Experimental Evaluation of Inventory-Based Discrete-Updating Market Maker for Intra-Firm Prediction  

E-Print Network [OSTI]

an inventory-based updating logic according to the transactions in the market. Laboratory experimentsExperimental Evaluation of Inventory-Based Discrete- Updating Market Maker for Intra-Firm Prediction Market System Using VIPS Hajime Mizuyama1 , Morio Ueda, Katsunobu Asada and Yu Tagaya 1 Department

Boyer, Edmond

464

Discrete-Time Model of an IPMSM Based on Variational Integrators  

E-Print Network [OSTI]

as automobile traction drives for electric and hybrid electric vehicles. Since motor control is commonly. INTRODUCTION Interior permanent magnet synchronous motors (IPMSM) provide a high efficiency besides very high and thus motivate the need of exact discrete- time motor models. Furthermore, the electrical frequency

Paderborn, Universität

465

Active Preference Learning with Discrete Choice Data Anonymous Author(s)  

E-Print Network [OSTI]

Abstract We propose an active learning algorithm that learns a continuous valuation model from discrete improvement at each query without accurately modelling the entire valuation sur- face, which would demonstrate the effectiveness of the new algorithm compared to related active learning methods. We also embed

de Freitas, Nando

466

Finite-element discretization of a linearized 2 -D model for lubricated oil transportation  

E-Print Network [OSTI]

Finite-element discretization of a linearized 2 - D model for lubricated oil transportation V acts as a lubricant by coating the wall of the pipeline, thus preventing the oil from adhering is devoted to the numerical simulation of a linearized model for the lubricated trans- portation of heavy

Frey, Pascal

467

Local Heating of Discrete Droplets Using Magnetic Porous Silicon-Based Photonic Crystals  

E-Print Network [OSTI]

of conventional microfluidic channel and heating systems. Introduction Much of the work on microfluidics to dateLocal Heating of Discrete Droplets Using Magnetic Porous Silicon-Based Photonic Crystals Ji-Ho Park and Technology (HarVard-MIT) and Department of Electrical Engineering and Computer Science, Massachusetts

Bhatia, Sangeeta

468

Discrete-ordinates solution of short-pulsed laser transport in two-dimensional turbid media  

E-Print Network [OSTI]

of the hyperbolic transient radiative-transport equation are not known. Ku- mar et al.4 considered the solution-pulsed laser transport is transient radiative-transfer theory. Complete an- alytical solutionsDiscrete-ordinates solution of short-pulsed laser transport in two-dimensional turbid media

Guo, Zhixiong "James"

469

D I M A C S Center for Discrete Mathematics and Theoretical Computer Science  

E-Print Network [OSTI]

­DIMATIA­Renyi Project on Combinatorial Methods . . . . . . . . . . . . 80 4.6 Project on Computer Science and Decision­LAMSADE Project on Computer Science and Decision Theory: Applica­ tions of Notions of ConsensusD I M A C S Center for Discrete Mathematics and Theoretical Computer Science 2002­2003 Annual

470

A test for second order stationarity of a time series based on the Discrete Fourier Transform  

E-Print Network [OSTI]

A test for second order stationarity of a time series based on the Discrete Fourier Transform property, we construct a Portmanteau type test statistic for testing stationarity of the time series. It is shown that under the null of stationarity, the test statistic is approximately a chi square distribution

Subba Rao, Suhasini

471

Symbolic Dynamic Programming for Discrete and Continuous State MDPs Scott Sanner  

E-Print Network [OSTI]

k + xi > 100 : 0 If our objective is to maximize the long-term value V (i.e., the sum of rewardsSymbolic Dynamic Programming for Discrete and Continuous State MDPs Scott Sanner NICTA & the ANU-theoretic planning for DC- MDPs, optimal solutions have only been defined so far for limited settings, e.g., DC

Sanner, Scott

472

Symbolic Variable Elimination for Discrete and Continuous Graphical Models Scott Sanner  

E-Print Network [OSTI]

Symbolic Variable Elimination for Discrete and Continuous Graphical Models Scott Sanner NICTA & ANU, e.g., estimating the position and pose of entities from measurements in robotics, or radar track Intelligence (www.aaai.org). All rights reserved. n xx1 ...x2 d 10 d 0 100 P(d) = P(x |d) = d x i i Figure 1

Sanner, Scott

473

SOURCE SEPARATION USING SPARSE DISCRETE PRIOR MODELS Radu Balan, Justinian Rosca  

E-Print Network [OSTI]

SOURCE SEPARATION USING SPARSE DISCRETE PRIOR MODELS Radu Balan, Justinian Rosca Siemens Corporate Research 755 College Road East Princeton, NJ 08540 e-mail: radu.balan,justinian.rosca¡ @siemens, in their origi- nal domain, or transformed domain (e.g. frequency domain). The mixing model is either

Balan, Radu V.

474

A chosen text attack on the RSA cryptosystem and some discrete logarithm schemes  

E-Print Network [OSTI]

A chosen text attack on the RSA cryptosystem and some discrete logarithm schemes Y. Desmedt. Odlyzko AT&T Bell Laboratories Murray Hill, NJ 07974, USA ABSTRACT A new attack on the RSA cryptosystem is presented. This attack assumes less than previous chosen ciphertext attacks, since the cryptanalyst has

Odlyzko, Andrew M.

475

Generalising the GHS Attack on the Elliptic Curve Discrete Logarithm Problem  

E-Print Network [OSTI]

Generalising the GHS Attack on the Elliptic Curve Discrete Logarithm Problem F. Hess Technical succumb to the basic GHS attack, thereby weakening curves over F2155 further. We also discuss other possible extensions or variations of the GHS attack and conclude that they are not likely to yield further

Hess, Florian

476

Using Discrete-Event Simulation to Model Situational Awareness of Unmanned-Vehicle Operators  

E-Print Network [OSTI]

but delegated to the automation onboard the unmanned vehicles (Sheridan, 1992). Reduced workload afforded1 Using Discrete-Event Simulation to Model Situational Awareness of Unmanned-Vehicle Operators Carl vehicles becomes increasingly realizable, the impact on operator situational awareness of such a paradigm

Cummings, Mary "Missy"

477

Numerical study of natural convection in a vertical porous annulus with discrete heating  

E-Print Network [OSTI]

­10]. Among the finite enclosures, free convective heat transfer in a differentially heated vertical porous in a vertical annular enclosure for a wide range of radius and aspect ratios, and also used an approximateNumerical study of natural convection in a vertical porous annulus with discrete heating M. Sankar

Lopez, John M.

478

A mixed finite element discretization scheme for a concrete carbonation model with concentration-dependent porosity  

E-Print Network [OSTI]

A mixed finite element discretization scheme for a concrete carbonation model with concentration/unsaturated porous media. The special features of our problem are twofold: the reaction produces water and therefore for the case of concrete carbonation ­ one of the most important physico-chemical processes affecting

Suciu, Nicolae

479

PHYSICAL REVIEW E 86, 011108 (2012) Nonequilibrium discrete nonlinear Schrodinger equation  

E-Print Network [OSTI]

PHYSICAL REVIEW E 86, 011108 (2012) Nonequilibrium discrete nonlinear Schr¨odinger equation Stefano Iubini,1,2 Stefano Lepri,1,* and Antonio Politi3,1 1 Consiglio Nazionale delle Ricerche, Istituto dei irreversible thermodynamics. Monte Carlo thermostats are implemented to impose a given temperature and chemical

Politi, Antonio

480

The Discrete LegendreFenchel Transform and its application to phase  

E-Print Network [OSTI]

. . . . . . . . . . . . . . . . . . . . . 18 3. The double Discrete Legendre-Fenchel Transform 21 3.1. Properties of the double DLFT-dimensional functions 28 4.1. Factorization of the DLFT . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 4.2. Factorization of the double DLFT with alternating dimensions . . . . . . . 29 4.3. Estimation of the dual set

Paris-Sud XI, Université de

Note: This page contains sample records for the topic "discrete atmospheric conditions" 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.


481

A one-mesh method for the cell-centered discretization of slide lines , B. Despresb  

E-Print Network [OSTI]

A one-mesh method for the cell-centered discretization of slide lines G. Claira, , B. Despresb , E is described to handle slide lines in cell-centered Lagrangian schemes for the modeling of sliding problems on the minimization of an objective function over a specific set that models the sliding constraint. We illustrate

Paris-Sud XI, Université de

482

Abstract--In this paper, we propose an overall optimization of discrete multi-tone transmissions  

E-Print Network [OSTI]

-- Discrete Multi-tone; Polymer Optical Fiber; Light Emitting Diode; System Optimization; Bit-linearity phenomenon in resonant cavity light emitting diode (RC-LED) causes distortions to DMT signals [19 emitting diode (RC-LED) dynamic non-linearity performance, and analog-to-digital converters effective

Boyer, Edmond

483

An Inverse Problem for Toeplitz Matrices and the Synthesis of Discrete Transmission Lines  

E-Print Network [OSTI]

An Inverse Problem for Toeplitz Matrices and the Synthesis of Discrete Transmission Lines Russel E and inverse problems for a transmission line which consists of piecewise constant components. Knowing the impulse response of the transmission line, we can calculate the capaci- tance taper of the line, and vice

Allen, Jont

484

Discrete-Time Dataflow Models for Visual Simulation in Ptolemy II  

E-Print Network [OSTI]

in Ptolemy II is a timed extension of the Synchronous Dataflow (SDF) domain. Although not completely backward compatible with SDF, DT keeps most of the desirable properties of SDF like static scheduling, regular in Ptolemy II 3.2 Synchronous Dataflow (SDF) Domain 3.3 Discrete Event (DE) Domain 3.4 Continuous Time (CT

485

Perturb-and-MAP Random Fields: Using Discrete Optimization to Learn and Sample from Energy Models  

E-Print Network [OSTI]

Perturb-and-MAP Random Fields: Using Discrete Optimization to Learn and Sample from Energy Models, the deterministic viewpoint on MRF modeling as energy minimization problem has im- portant limitations as it does bridge the gap be- tween the probabilistic and the energy minimization ap- proaches to MRF modeling. We

Yuille, Alan L.

486

Europhysics Letters PREPRINT Exploring the lower part of discrete polymer model energy  

E-Print Network [OSTI]

Europhysics Letters PREPRINT Exploring the lower part of discrete polymer model energy landscapes simple spin glass models to biopolymer folding. In this picture, energy is viewed as an explicit function EUROPHYSICS LETTERS among them ±J spin models [10], potential energy surfaces (PES) for protein folding [8

Stadler, Peter F.

487

Reconstructing Polyatomic Structures from Discrete XRays: NPCompleteness Proof for Three Atoms  

E-Print Network [OSTI]

of an algorithmic problem belonging to discrete tomography, the area of mathematics and computer science that deals tomography problem that arises in the study of the atomic structure of crystal lattices. A polyatomic and column sums. \\Lambda Department of Computer Science, University of California, Riverside, CA 92521

Chrobak, Marek

488

Conservative one-dimensional finite volume discretization of a new cavitation model for pistonring lubrication  

E-Print Network [OSTI]

Conservative one-dimensional finite volume discretization of a new cavitation model for piston Cavitation Elrod­Adams model Piston­rings a b s t r a c t This paper presents a conservative numerical implementation of a new cavitation model that is well suited for lubrication problems with cavitated regions

Buscaglia, Gustavo C.

489

Sparse signal reconstruction from polychromatic X-ray CT measurements via mass attenuation discretization  

SciTech Connect (OSTI)

We propose a method for reconstructing sparse images from polychromatic x-ray computed tomography (ct) measurements via mass attenuation coefficient discretization. The material of the inspected object and the incident spectrum are assumed to be unknown. We rewrite the Lambert-Beer’s law in terms of integral expressions of mass attenuation and discretize the resulting integrals. We then present a penalized constrained least-squares optimization approach for reconstructing the underlying object from log-domain measurements, where an active set approach is employed to estimate incident energy density parameters and the nonnegativity and sparsity of the image density map are imposed using negative-energy and smooth ?{sub 1}-norm penalty terms. We propose a two-step scheme for refining the mass attenuation discretization grid by using higher sampling rate over the range with higher photon energy, and eliminating the discretization points that have little effect on accuracy of the forward projection model. This refinement allows us to successfully handle the characteristic lines (Dirac impulses) in the incident energy density spectrum. We compare the proposed method with the standard filtered backprojection, which ignores the polychromatic nature of the measurements and sparsity of the image density map. Numerical simulations using both realistic simulated and real x-ray ct data are presented.

Gu, Renliang; Dogandži?, Aleksandar [Iowa State University, Center for Nondestructive Evaluation, 1915 Scholl Road, Ames, IA 50011 (United States)

2014-02-18T23:59:59.000Z

490

Management of a Smart Grid with Controlled-Delivery of Discrete Power Levels  

E-Print Network [OSTI]

Management of a Smart Grid with Controlled-Delivery of Discrete Power Levels Roberto Rojas of Technology Newark, NJ 07102 {rojas, yx63, grebel}@njit.edu Abstract--The present electrical grid uses two to power amounts. These two properties, although functional and practical, expose the grid to overload

Rojas-Cessa, Roberto

491

ON THE SYNTHESIS OF OPTIMAL SCHEDULERS IN DISCRETE EVENT CONTROL PROBLEMS WITH MULTIPLE GOALS  

E-Print Network [OSTI]

ON THE SYNTHESIS OF OPTIMAL SCHEDULERS IN DISCRETE EVENT CONTROL PROBLEMS WITH MULTIPLE GOALS HERV to modify if necessary and piece together, or schedule, all of the controllers built in the first step, optimal control, scheduler, traveling salesman problem AMS subject classifications. 93A99, 49-XX, 90C27

Paris-Sud XI, Université de

492

Waves and propagation failure in discrete space models with nonlinear coupling and  

E-Print Network [OSTI]

Waves and propagation failure in discrete space models with nonlinear coupling and feedback Markus by the linearisation ahead of the wave front. Wave propagation (and failure) is studied when the homogeneous dynamics are bistable. Simulations show that waves may propagate in either direction, or may be pinned. A Lyapunov

493

Discrete Nonlinear Schrodinger Equation, Solitons and Organizing Principles for Protein Folding  

E-Print Network [OSTI]

We introduce a novel generalization of the discrete nonlinear Schr\\"odinger equation. It supports solitons that describe how proteins fold. As an example we scrutinize the villin headpiece HP35, an archetypal protein for testing both experimental and theoretical approaches to protein folding. Using explicit soliton profiles we construct its carbon backbone with an unprecedented accuracy.

Nora Molkenthin; Shuangwei Hu; Antti J. Niemi

2010-09-06T23:59:59.000Z

494

The Subcritical Collapse of Predator Populations in Discrete-Time Predator-Prey Models  

E-Print Network [OSTI]

The Subcritical Collapse of Predator Populations in Discrete-Time Predator-Prey Models MICHAEL G undergo a subcritical flip bifurcation with a concomitant crash in the predator's popula- tion. We review a technique for distinguishing between subcritical and supercritical flip bifurcations and provide examples

de Aguiar, Marcus A. M.

495

Dot Density Maps Dot density maps, or dot maps, portray the geographic distribution of discrete phenomena  

E-Print Network [OSTI]

Dot Density Maps Dot density maps, or dot maps, portray the geographic distribution of discrete for representing geographic patterns. Dot density maps are particularly useful for understanding global distribution of the mapped phenomenon and comparing relative densities of different regions on the map. Dot

Klippel, Alexander

496

Using machine learning techniques to interpret results from discrete event simulation  

E-Print Network [OSTI]

Using machine learning techniques to interpret results from discrete event simulation Dunja Mladeni machine learning techniques. The results of two simulators were processed as machine learning problems. In the experiments, the simulation results were interpreted by two attribute­ based learning programs Retis

Mladenic, Dunja

497

Hybrid Systems and Biology. Continuous and Discrete Modeling for Systems Biology  

E-Print Network [OSTI]

Hybrid Systems and Biology. Continuous and Discrete Modeling for Systems Biology Luca Bortolussi1 (IGA) alberto.policriti@appliedgenomics.org Abstract. Hybrid Systems are dynamical systems presenting both dis- crete and continuous evolution. Hybrid Automata are a formal model for hybrid systems

Bortolussi, Luca

498

Decision making in fuzzy discrete event systems F. Lin a,c,*, H. Ying a  

E-Print Network [OSTI]

includes a FDES decision model, a fuzzy objective generator for generating optimal control objectives Elsevier Inc. All rights reserved. Keywords: Discrete event systems; Fuzzy logic; Decision making; HIV ``good'' to ``bad''. For such applications, we need to introduce fuzzy logic to DES. In a conference

Lin, Feng

499

QUANTITATIVE BOUNDS ON THE DISCRETE SPECTRUM OF NON SELF-ADJOINT QUANTUM  

E-Print Network [OSTI]

A55. Key words and phrases. Non self-adjoint relatively compact perturbations of self- adjoint compact perturbation with respect to the self- adjoint operator H0, then the Weyl's criterionQUANTITATIVE BOUNDS ON THE DISCRETE SPECTRUM OF NON SELF-ADJOINT QUANTUM MAGNETIC HAMILTONIANS

Boyer, Edmond

500

Discrete Convexity and Equilibria in Economies with Indivisible Goods and Money  

E-Print Network [OSTI]

Discrete Convexity and Equilibria in Economies with Indivisible Goods and Money Vladimir Danilov (numeraire or money). The objective of this paper is to clarify a general mathematical mechanism which of indivisible goods and one perfectly divisible good (numeraire or money). This means that the commodity space