Long-Term Monitoring Using Deep Seafloor Boreholes Penetrating the Seismogenic Zone
Tsunogai, Urumu
Long-Term Monitoring Using Deep Seafloor Boreholes Penetrating the Seismogenic Zone Masanao, because it has, until now, been impossible to penetrate to such depths below the sea floor. The Integrated Ocean Drilling Program (IODP), scheduled to begin in ,**-, plans to drill boreholes beneath the ocean
Abiotic Oxidation Rate of Chalcopyrite: Implications for Seafloor Mining
Bilenker, Laura Danielle
2011-01-01T23:59:59.000Z
in Seawater: Implications for Mining Seafloor Hot Spring.American Institute of Mining, Metallurgical, and PetroleumImplications for Seafloor Mining A Thesis submitted in
Wavelet based similarity measurement algorithm for seafloor morphology
Darilmaz, ?lkay
2006-01-01T23:59:59.000Z
The recent expansion of systematic seafloor exploration programs such as geophysical research, seafloor mapping, search and survey, resource assessment and other scientific, commercial and military applications has created ...
Kinetics of Pyrrhotite Oxidation in Seawater: Implications for Mining Seafloor Hotsprings
Romano, Gina Yolanda
2012-01-01T23:59:59.000Z
implications for seafloor mining, University of California,J. , 2010, Deep- sea mining of seafloor massive sulfides,in Seawater: Implications for Mining Seafloor Hotsprings A
A Seafloor Microbial Biome Hosted within Incipient Ferromanganese...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Santelli, Orcutt et al. 2008). Yet microbially-mediated basalt alteration and energy conservation has not been directly demonstrated on the seafloor. By using synchrotron-based...
The submerged offshore breakwater and its effects on seafloor topography
Tallent, James Russell
1986-01-01T23:59:59.000Z
THE SUBMERGED OFFSHORE BREAKWATER AND ITS EFFECTS ON SEAFLOOR TOPOGRAPHY A Thesis by JAMES RUSSELL TALLENT Submitted to the Graduate College of Texas AGM University in partial fulfillment of the requirements for the degree of MASTER... OF SCIENCE December 19BG Major Subject: Civil Engineering THE SUBMERGEO OFFSHORE BREAKWATER AND ITS EFFECTS ON SEAFLOOR TOPOGRAPHY A Thesis by JAMES RUSSELL TALLENT Approved as to style and content by: John B. Herbich (Chairman) Lauriston R. King...
CX-009465: Categorical Exclusion Determination | Department of...
Broader source: Energy.gov (indexed) [DOE]
Categorical Exclusion Determination Temporal Characterization of Hydrates System Dynamics Beneath Seafloor Mounds: Integrating Time-Lapse CX(s) Applied: B3.6 Date: 10182012...
CX-009462: Categorical Exclusion Determination | Department of...
Broader source: Energy.gov (indexed) [DOE]
Categorical Exclusion Determination Temporal Characterization of Hydrates System Dynamics Beneath Seafloor Mounds: Integrating Time-Lapse CX(s) Applied: A9, A11 Date: 1018...
NETL F 451.1/1-1, Categorical Exclusion Designation Form
Broader source: Energy.gov (indexed) [DOE]
FY13 30 months Skip Pratt Abbeville, MS Temporal Characterization of Hydrates System Dynamics Beneath Seafloor Mounds: Integrating Time-Lapse Machine shop at the University of...
CX-009463: Categorical Exclusion Determination | Department of...
Broader source: Energy.gov (indexed) [DOE]
Categorical Exclusion Determination Temporal Characterization of Hydrates System Dynamics Beneath Seafloor Mounds: Integrating Time-Lapse CX(s) Applied: B3.6 Date: 10182012...
NETL F 451.1/1-1, Categorical Exclusion Designation Form
Broader source: Energy.gov (indexed) [DOE]
FY13 30 months Skip Pratt Waco, TX Temporal Characterization of Hydrates System Dynamics beneath Seafloor Mounds: Integrating Time-Lapse Office facilities will be used to...
NETL F 451.1/1-1, Categorical Exclusion Designation Form
Broader source: Energy.gov (indexed) [DOE]
30 months Skip Pratt University, MS Temporal Characterization of Hydrates System Dynamics Beneath Seafloor Mounds: Integrating Time-Lapse Office facilities will be used to...
CX-009464: Categorical Exclusion Determination | Department of...
Broader source: Energy.gov (indexed) [DOE]
Categorical Exclusion Determination Temporal Characterization of Hydrates System Dynamics beneath Seafloor Mounds: Integrating Time-Lapse CX(s) Applied: A9, A11 Date: 1018...
NETL F 451.1/1-1, Categorical Exclusion Designation Form
Broader source: Energy.gov (indexed) [DOE]
FY13 30 months Skip Pratt Wylie, TX Temporal Characterization of Hydrates System Dynamics Beneath Seafloor Mounds: Integrating Time-Lapse Specialty Devices, Inc. facility will...
Crust and Upper Mantle P Wave Velocity Structure Beneath Valles...
Crust and Upper Mantle P Wave Velocity Structure Beneath Valles Caldera, New Mexico- Results from the Jemez Teleseismic Tomography Experiment Jump to: navigation, search OpenEI...
Evidence For Gas And Magmatic Sources Beneath The Yellowstone...
of magma beneath the Yellowstone caldera. Authors Stephan Husen, Robert B. Smith and Gregory P. Waite Published Journal Journal of Volcanology and Geothermal Research,...
Anomalous shear wave attenuation in the shallow crust beneath...
Anomalous shear wave attenuation in the shallow crust beneath the Coso volcanic region, California Jump to: navigation, search OpenEI Reference LibraryAdd to library Journal...
Inferences On The Hydrothermal System Beneath The Resurgent Dome...
System Beneath The Resurgent Dome In Long Valley Caldera, East-Central California, USA, From Recent Pumping Tests And Geochemical Sampling Jump to: navigation, search OpenEI...
Structure and Stratigraphy Beneath a Young Phreatic Vent: South...
Caldera, California Jump to: navigation, search OpenEI Reference LibraryAdd to library Journal Article: Structure and Stratigraphy Beneath a Young Phreatic Vent: South Inyo Crater,...
DIVISION S-10--WETLAND SOILS Carbon Accumulation and Storage in Mineral Subsoil beneath Peat
Moore, Tim
DIVISION S-10--WETLAND SOILS Carbon Accumulation and Storage in Mineral Subsoil beneath Peat Tim R subsoil (Turunen and Moore, 2003). TheyWe showed that sandy subsoils beneath peat near Ramsey Lake conditions beneath the peat. soils beneath the forest, those beneath the peat contained similar In this paper
C1-Approximationof Seafloor Surfaces With Large Variations Christian Gout' and Dimitri Komatitsch2
Komatitsch, Dimitri
C1-Approximationof Seafloor Surfaces With Large Variations Christian Gout' and Dimitri Komatitsch2 ' Department of Applied Mathematics, IJniversit6 de Pau, E.R.S. 2055-CNRS, 64000 Pau, France, Christian.gout
Crowston, Kevin
contextualized and specific characteristics of primary work practice. Author Keywords Guides; instructions; ACM knowledge about work practices needed for good performance. Such tacit knowledge can be conveyed insteadPlanet Hunters and Seafloor Explorers: Legitimate Peripheral Participation Through Practice Proxies
Reeves, Eoghan
2010-01-01T23:59:59.000Z
This thesis presents the results of four discrete investigations into processes governing the organic and inorganic chemical composition of seafloor hydrothermal fluids in a variety of geologic settings. Though Chapters 2 ...
Bacteria beneath the West Antarctic Ice Sheet Brian Lanoil,1
Priscu, John C.
Bacteria beneath the West Antarctic Ice Sheet Brian Lanoil,1 * Mark Skidmore,1 John C. Priscu,2, particularly those that lie beneath polar ice sheets, are beginning to be recog- nized as an important part Vostok, Antarctica, no sub-ice sheet environments have been shown to support microbial ecosystems. Here
Melt generation, crystallization, and extraction beneath segmented oceanic transform faults
Gregg, Patricia M.
We examine mantle melting, fractional crystallization, and melt extraction beneath fast slipping, segmented oceanic transform fault systems. Three-dimensional mantle flow and thermal structures are calculated using a ...
Laboratory simulation of subsurface airflow beneath a building
Corsello, Joseph William
2014-01-01T23:59:59.000Z
Vapor intrusion is the vapor-phase migration of volatile organic compounds (VOCs) into buildings due to subsurface soil or groundwater contamination. Oxygen replenishment rates beneath a building are significant for ...
Mapping bedrock beneath glacial till using CDP seismic reflection methods
Keiswetter, Dean; Black, Ross A.; Steeples, Don W.
1994-03-01T23:59:59.000Z
This paper is a case history demonstrating the applicability of the common depth point (CDP) seismic reflection method to image bedrock beneath glacial till in northwestern Iowa. Reflections from the base of the 40-m thick glacial till are clearly...
Seismic evidence for a moderately thick lithosphere beneath the Siberian Platform
Seismic evidence for a moderately thick lithosphere beneath the Siberian Platform Keith Priestley-wavespeed tomographic model for the upper mantle beneath the Siberian platform and surrounding region derived from lithosphere is $200 km thick beneath most of the Siberian platform but may extend to $250 km depth beneath
Oxygen as a control on seafloor biological communities and their roles in sedimentary carbon cycling
Oxygen as a control on seafloor biological communities and their roles in sedimentary carbon experiments were conducted at sites spanning the steep oxygen, organic matter, and biological community gradients across the Arabian Sea oxygen minimum zone, in order to quantify the role that fauna play
Buoyant melting instabilities beneath extending lithosphere: 1. Numerical models
Tackley, Paul J.
Buoyant melting instabilities beneath extending lithosphere: 1. Numerical models John W. Hernlund,1,2 Paul J. Tackley,1,3 and David J. Stevenson4 Received 18 November 2006; revised 18 October 2007 diffusely extending lithosphere is studied using numerical convection models covering a wide range
Upper mantle flow beneath the Hangay dome, central Mongolia
Déverchère, Jacques
Upper mantle flow beneath the Hangay dome, central Mongolia Acknowledgements This work, A., Amarjargal, S. and Déverchère, J., 2003. GPS measurements of crustal deformation in the Baikal-Mongolia., 2002. Mantle structure and rifting processes in the Baikal-Mongolia region: geophysical data
Beneath the shadow of the Tower Soldiers' Tower
Beneath the shadow of the Tower Soldiers' Tower Schedule of Events October-November 2013 As of Oct. 21, 2013 Telephone: 416-978-3485 (office) E-mail: soldiers.tower@utoronto.ca Soldiers' Tower Web Site: www.alumni.utoronto.ca/tower Facebook: www.facebook.com/soldierstower U of T Events web site: www
Craddock, Paul R
2009-01-01T23:59:59.000Z
Systematic differences in trace element compositions (rare earth element (REE), heavy metal, metalloid concentrations) of seafloor vent fluids and related deposits from hydrothermal systems in the Manus back-arc basin ...
Searching for life where the sun don't shine : explorations to the seafloors of Earth and Europa
Fitzpatrick, Garret R
2012-01-01T23:59:59.000Z
Hydrothermal vents on Earth's seafloor host entire ecosystems that live off energy from chemosynthesis rather than photosynthesis. This energy process uses chemical reactions between metals and hot gases from inside Earth's ...
Electrical structure beneath the northern MELT line on the East Pacific Rise at 15450
Brest, Université de
Electrical structure beneath the northern MELT line on the East Pacific Rise at 15°450 S Kiyoshi] The electrical structure of the upper mantle beneath the East Pacific Rise (EPR) at 15°450 S is imaged structure beneath the northern MELT line on the East Pacific Rise at 15°450 S, Geophys. Res. Lett., 33, L
Sub-Seafloor Carbon Dioxide Storage Potential on the Juan de Fuca Plate, Western North America
Jerry Fairley; Robert Podgorney
2012-11-01T23:59:59.000Z
The Juan de Fuca plate, off the western coast of North America, has been suggested as a site for geological sequestration of waste carbon dioxide because of its many attractive characteristics (high permeability, large storage capacity, reactive rock types). Here we model CO2 injection into fractured basalts comprising the upper several hundred meters of the sub-seafloor basalt reservoir, overlain with low-permeability sediments and a large saline water column, to examine the feasibility of this reservoir for CO2 storage. Our simulations indicate that the sub-seafloor basalts of the Juan de Fuca plate may be an excellent CO2 storage candidate, as multiple trapping mechanisms (hydrodynamic, density inversions, and mineralization) act to keep the CO2 isolated from terrestrial environments. Questions remain about the lateral extent and connectivity of the high permeability basalts; however, the lack of wells or boreholes and thick sediment cover maximize storage potential while minimizing potential leakage pathways. Although promising, more study is needed to determine the economic viability of this option.
Meyers, Stephen R.
Late PleistoceneHolocene sedimentation surrounding an active seafloor gas-hydrate and cold 2010 Communicated by J.T. Wells Keywords: gas hydrate(s) cold or petroleum seep(s) Mississippi Canyon 118 (MC118) National Gas Hydrate Seafloor Observatory Gulf of Mexico Late Pleistocene Holocene
Moho topography beneath the Corinth Rift area (Greece) from inversion of gravity data
Demouchy, Sylvie
Moho topography beneath the Corinth Rift area (Greece) from inversion of gravity data C. Tiberi,1 to Miocene lithospheric instabilities. Key words: boudinage, continental rifts, gravity inversion, Greece
A Temperature Model Of The Crust Beneath The Barents Sea- Investigatio...
to: navigation, search OpenEI Reference LibraryAdd to library Journal Article: A Temperature Model Of The Crust Beneath The Barents Sea- Investigations Along Geotraverses...
Thermo-mechanical structure beneath the young orogenic belt of Taiwan
Ma, Kuo-Fong
Thermo-mechanical structure beneath the young orogenic belt of Taiwan Kuo-Fong Ma*, Teh-Ru Alex Abstract We investigate the thermo-mechanical properties beneath the young orogenic belt of Taiwan.V. All rights reserved. Keywords: Thermo-mechanical; Rheology; Seismicity; Strength profile; Composition
Niu, Fenglin
Mantle transition zone beneath the Caribbean-South American plate boundary and its tectonic seismic network of Venezuela to study the mantle transition zone structure beneath the Caribbean Caribbean, the 410-km is featured by a narrow (200 km EW) 25-km uplift extending in the NS direction around
Spatial distribution of melt conduits in the mantle beneath oceanic spreading ridges: Observations
accretion beneath the ridges. Dunite veins, composed of the minerals olivine and spinel, mark conduits that mantle melt extraction occurs in a fractal, branching network, and with recent results on formation] There are two essential observational con- straints on melt extraction from the mantle beneath oceanic spreading
Analysis of pumping-induced unsaturated regions beneath a perennial river
Zhou, Quanlin
Analysis of pumping-induced unsaturated regions beneath a perennial river Grace W. Su,1,2 James a streambed during groundwater pumping near streams can reduce the pumping capacity, change flow paths) the formation of an unsaturated region beneath the stream, (2) the pumping capacity, (3) stream water fluxes
Horizontal subduction and truncation of the Cocos Plate beneath central Mexico
Clayton, Robert W.
Horizontal subduction and truncation of the Cocos Plate beneath central Mexico Xyoli Pe from a trans-Mexico temporary broadband seismic network centered on Mexico City, we report that the subducting Cocos Plate beneath central Mexico is horizontal, and tectonically underplates the base
He, X; Wang, L; Su, Y
2013-01-01T23:59:59.000Z
bs_bs_banner Above the Roof, Beneath the Law: Perceivedmigrant workers perch on roof tops or towering construction
Coastal DEMs integrate seafloor bathymetry and land topography to depict Earth's solid surface Sheet What is a coastal DEM? A coastal DEM depicts Earth's land surface and ocean bottom. It is made
Ice-induced enhancement of solar radiation beneath overcast skies near Antarctica
Horvath, Nicholas Charles
1981-01-01T23:59:59.000Z
ICE-INDUCED ENHANCEMENT OF SOLAR RADIATION BENEATH OVERCAST SKIES NEAR ANTARCTICA A Thesis by NICHOLAS CHARLES HORVATH Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirement for the degree... of MASTER OF SCIFNCE May 1981 Major Subject: Meteorology ICE-INDUCED ENHANCEMENT OF SOLAR RADIATION BENEATH OVERCAST SKIES NEAR ANTARCTICA A Thesis by NICHOLAS CHARLES HORVATH Approsed as to style and content by: (Ch irman of Committee) (Member...
Basal melt rates beneath Whillans Ice Stream, West Antarctica
Beem, Lucas H.; Jezek, Ken C.; Van Der Veen, C. J.
2010-08-05T23:59:59.000Z
Basal water lubricates and enables the fast flow of the West Antarctic ice streams which exist under low gravitational driving stress. Identification of sources and rates of basal meltwater production can provide insight into the dynamics of ice...
Constraints on a plume in the mid-mantle beneath the Iceland region from seismic array data
Foulger, G. R.
of kilometres long, with P-wave speeds VPy0.5 per cent high, extend into the lower mantle beneath some, though of such a continuous low-wave-speed zone beneath a hotspot does not necessarily indicate a zone of upwelling traversing was investigated by Ji & Nataf (1998), who applied 2-D waveform tomography to scattered long-period P waves
Abarca, Elena
Detailed field measurements are combined with a numerical modeling to characterize the groundwater dynamics beneath the discharge zone at Waquoit Bay, Massachusetts. Groundwater salinity values revealed a saline circulation ...
Recalculated probability of M !!!!!! 7 earthquakes beneath the Sea of Marmara, Turkey
Recalculated probability of M !!!!!! 7 earthquakes beneath the Sea of Marmara, Turkey Tom Parsons U); KEYWORDS: earthquake probability, Sea of Marmara, seismic hazard, Turkey, stress interaction, North of Marmara, Turkey, J. Geophys. Res., 109, B05304, doi:10.1029/2003JB002667. 1. Introduction [2] The North
Sampling and Hydrogeology of the Vadose Zone Beneath the 300 Area Process Ponds
Bjornstad, Bruce N.
2004-08-31T23:59:59.000Z
Four open pits were dug with a backhoe into the vadose zone beneath the former 300 Area Process Ponds in April 2003. Samples were collected about every 2 feet for physical, chemical, and/or microbiological characterization. This reports presents a stratigraphic and geohydrologic summary of the four excavations.
Re^Os evidence for replacement of ancient mantle lithosphere beneath the North China craton
Rudnick, Roberta L.
Re^Os evidence for replacement of ancient mantle lithosphere beneath the North China craton Shan and was replaced by more fertile lithospheric mantle sometime after the Paleozoic. Moreover, lithospheric mantle crust (2700 Ma), suggesting that the original Archean lithosphere was replaced in the Proterozoic
RoBOT: "Rocks Beneath Our Toes" An experiential learning opportunity in mineralogy and geochemistry
Baxter, Ethan F.
RoBOT: "Rocks Beneath Our Toes" An experiential learning opportunity in mineralogy with Boston University undergraduates to analyze the mineralogy and unravel the unique story that each rock into modern scientific methods of geochemistry and mineralogy and to unlock for them the exciting
Niu, Fenglin
Natural Gas Institute, China University of Petroleum, Beijing, China b Department of Earth Science, RiceDistinct compositional thin layers at mid-mantle depths beneath northeast China revealed crust northeast China USArray a b s t r a c t We observe a clear seismic arrival at $35Â45 s after
Niu, Fenglin
Natural Gas Institute, China University of Petroleum, Beijing, China b Department of Earth Science, RiceDistinct compositional thin layers at mid-mantle depths beneath northeast China revealed February 2013 Keywords: S to P converted wave mid-mantle reflectors subducted oceanic crust northeast China
The structure of a Mesozoic basin beneath the Lake Tana area, Ethiopia, revealed by magnetotelluric of Mines, Addis Ababa, Ethiopia c Geological Survey of Ethiopia, Addis Ababa, Ethiopia Received 18 April 2006 Abstract The northwestern Plateau of Ethiopia is almost entirely covered with extensive Tertiary
Niu, Fenglin
Upper mantle structure beneath the Caribbean-South American plate boundary from surface wave velocity structure of the crust and upper mantle of the Caribbean-South American boundary region American continental lithosphere, the Venezuelan archipelago, and the Caribbean oceanic lithosphere
Upper mantle flow beneath and around the Hangay dome, Central Mongolia Guilhem Barruol a,
Déverchère, Jacques
Upper mantle flow beneath and around the Hangay dome, Central Mongolia Guilhem Barruol a, , Anne Academy of Sciences (RCAG), P.O. Box 51, Ulaanbaatar, Mongolia a b s t r a c ta r t i c l e i n f o-wave splitting upper mantle Mongolia Hangay dome Siberian craton Bogd fault Mongolia represents the northernmost
Office of Legacy Management (LM)
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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOn AprilA group currentBradleyTableSelling7111AWell: Gas productionDynamic , and Static ,
Determining the Fate of Methane Released from the Seafloor in Deep and Shallow Water Environments
Du, Mengran
2014-08-12T23:59:59.000Z
Marine gas seeps and accidental marine oil spills are sources of methane (CH_(4)) to the ocean, and potentially to the atmosphere, though the magnitude of the fluxes and dynamics of these systems are poorly defined. For example, the ultimate...
Determining the Fate of Methane Released from the Seafloor in Deep and Shallow Water Environments
Du, Mengran
2014-08-12T23:59:59.000Z
Marine gas seeps and accidental marine oil spills are sources of methane (CH_(4)) to the ocean, and potentially to the atmosphere, though the magnitude of the fluxes and dynamics of these systems are poorly defined. For example, the ultimate...
Oldenburg, Carl von Ossietzky UniversitÃ¤t
for the detection of dissolved and sunken pollutants. One of these instruments is the submarine lidar, combining: fluorescence lidar, range-gating video, seafloor monitoring 1. Submarine sensor network for pollution of Oldenburg, Laser Remote Sensing Group), Â· an acoustic sensor for measuring the acoustic impedance
Melt zones beneath five volcanic complexes in California: an assessment of shallow magma occurrences
Goldstein, N.E.; Flexser, S.
1984-12-01T23:59:59.000Z
Recent geological and geophysical data for five magma-hydrothermal systems were studied for the purpose of developing estimates for the depth, volume and location of magma beneath each area. The areas studied were: (1) Salton Trough, (2) The Geysers-Clear Lake, (3) Long Valley caldera, (4) Coso volcanic field, and (5) Medicine Lake volcano, all located in California and all selected on the basis of recent volcanic activity and published indications of crustal melt zones. 23 figs.
Gao, Stephen Shangxing
Mongolia: receiver function data and their possible geological implication Yu.A. Zorina,*, V.V. MordvinovaaBaikal, Paleozoic Mongolian, Early Mesozoic MongoliaOkhotsk fold areas, and beneath the Siberian platform
Soil stiffness beneath a rigid mass using non-destructive impact testing
Maxwell, James Christopher
1992-01-01T23:59:59.000Z
University Chair of Advisory Committee: Dr. Jean-Louis Briaud Research on the prediction of the soil stiffness beneath spread footings using non-destructive impact testing was conducted. Three sites having three different soils were investigated.... The soils tested were sand, clay and a landfill covered with a layer of gravel. Impact tests were performed on several footings resting on sand. These footings ranged in size from 0. 093 to 0. 836 m'. One small footing (0. 093 m') was used at several...
Distribution of stress in the oceanic lithosphere beneath the Lau-Havre Basin
Altman, Larry Wayne
1978-01-01T23:59:59.000Z
. If the material injected into the basin floor came from the upper edge of the down-going slab, then it should be andesitic in composition just like the rocks of the volcanic frontal arc which are thought to have the same source. The CI CI CI Cl I I I I... arcs. In this theory, the Benioff zones do not delineate great thrust faults in the classical sense, but rather, they reflect underthrusting or subduction of lithospheric plates into the mantle beneath the arcs. The Origin of Marginal Basins...
NUMERICAL MODELING OF SHOCK-INDUCED DAMAGE FOR GRANITE UNDER DYNAMIC LOADING
Stewart, Sarah T.
NUMERICAL MODELING OF SHOCK-INDUCED DAMAGE FOR GRANITE UNDER DYNAMIC LOADING H. A. Ai1 , T. J beneath impact crater in granite. Model constants are determined either directly from static uniaxial from Century Dynamics to simulate the shock-induced damage in granite targets impacted by projectiles
A comprehensive analysis of contaminant transport in the vadose zone beneath tank SX-109
Ward, A.L.; Gee, G.W.; White, M.D.
1997-02-01T23:59:59.000Z
The Vadose Zone Characterization Project is currently investigating the subsurface distribution of gamma-emitting radionuclides in S and SX Waste Management Area (WMA-S-SX) located in the 200 West Area of the US Department of Energy`s Hanford Site in southeastern Washington State. Spectral-gamma logging of boreholes has detected elevated {sup 137}Cs concentrations as deep as 38 m, a depth considered excessive based on the assumed geochemistry of {sup 137}Cs in Hanford sediments. Routine groundwater sampling under the Resource Conservation and Recovery Act (RCRA) have also detected elevated levels of site-specific contaminants downgradient of WMA-S-SX. The objective of this report is to explore the processes controlling the migration of {sup 137}Cs, {sup 99}Tc, and NO{sub 3} through the vadose zone of WMA-S-SX, particularly beneath tank SX-109.
Handford, C.R.; Kendall, A.C.; Dunham, J.B.; Logan, B.W.
1983-03-01T23:59:59.000Z
Research currently being conducted by the Sedimentology and Marine Geology Group, under Brian W. Logan at the University of Western Australia, has recently concentrated on Lake MacLeod, a 2000 km/sup 2/ (770 mi/sup 2/) coastal salina on the western coast of Australia. This work has shown that this evaporite basin, which is 3 to 4 m (10 to 13 ft) below sea level, is separated from the Indian Ocean by a topographic barrier, but seawater under hydrostatic head, seeps freely through the barrier and discharges from several vents and springs in a carbonate mud flat at the north end of the basin. From there, seawater flows slowly across the basin, evaporating and depositing carbonate, gypsum, and ephemeral halite. About 10 to 12 m (33 to 39 ft) of evaporites have been deposited in the past 5300 years. In July 1982, the authors visited the carbonate mud flats and discovered abundant aragonite pisolites and botryoidal-mammillary crusts of fibrous aragonite cement beneath lily-pad tepee slabs of cemented protodolomite. Thick aragonite crusts cover both the undersides of lily-pad slabs and the lithified floors of tepees. Crusts covering the floors are more botryoidal and consist of both aragonite nubs and mounds (0.2 to 2.5 cm, 0.08 to 1 in., in diameter), and a few scattered, loose pisolites, several millimeters in diameter. The manner in which crusts, pisolites, and tepees occur at Lake MacLeod raises the possibility that they and their ancient counterparts from the Permian basin share a common origin. Perhaps Permian pisolites and aragonite crusts formed beneath cemented slabs of peritidal sediments in tepees bathed by marine water which seeped across exposed portions of the shelf crest.
Scott Fendorf; Phil Jardine
2006-07-21T23:59:59.000Z
The goal of this research was to provide an improved understanding and predictive capability of coupled hydrological and geochemical mechanisms that are responsible for the accelerated migration and immobilization of radionuclides and toxic metals in the badose zone beneath the Hanford Tank Farms.
Wen, Lianxing
Seismic structure and ultra-low velocity zones at the base of the Earth's mantle beneath Southeast t We constrain seismic structure and ultra-low velocity zones near the Earth's core-mantle boundary that the strong scatterers represent ultra-low velocity zones (ULVZs). We suggest that the seismic structure
Neher, Deborah A.
Soil nematode communities are ecologically more mature beneath late- than early-successional stage biological soil crusts Brian J. Darby a,*, Deborah A. Neher a , Jayne Belnap b a Department of Plant and Soil; accepted 12 April 2006 Abstract Biological soil crusts are key mediators of carbon and nitrogen inputs
Demouchy, Sylvie
Density distribution of the India plate beneath the Tibetan plateau: Geophysical and petrological combine seismological and Bouguer anomaly data with thermo-kinematic and petrological modelling of its descent is reached. In an integrated geophysical and petrological approach, the temperature field
Smith, Jerome A.
mixed-layer energy [D'Asaro et al., 1995]. In this study we show that, even under weak wind and waveRapid generation of high-frequency internal waves beneath a wind and wave forced oceanic surface Received 7 March 2008; revised 9 May 2008; accepted 2 June 2008; published 8 July 2008. [1] High
, meltwater plume model to study interactions beneath ice shelves off the coast of West Antarctica.interactions beneath ice shelves off the coast of West Antarctica. Victoria Lee1 (v.lee@bristol.ac.uk), Tony Payne1 on the Antarctic Ice Sheet. Observational studies have shown that ice shelves off the coast of West Antarctica
Menke, William
-Frank-K, Observing seafloor tilt on Axial Segment, Juan de Fuca Ridge. Eos, Transactions, American Geophysical Union de Fuca Ridge. Geophysical Research Letters.22; 2, Pages 147-150. 1995. Baker-Edward-T; Fox eruption of Axial Volcano, Juan de Fuca Ridge. Geophysical Research Letters.26; 23, Pages 3445-3448. 1999
Bioremediation of RDX in the vadose zone beneath the Pantex Plant
Shull, T.L.; Speitel, G.E. Jr.; McKinney, D.C. [Univ. of Texas, Austin, TX (United States). Dept. of Civil Engineering] [Univ. of Texas, Austin, TX (United States). Dept. of Civil Engineering
1999-01-01T23:59:59.000Z
The presence of dissolved high explosives (HE), in particular RDX and HMX, is well documented in the perched aquifer beneath the Pantex Plant, but the distribution of HE in the vadose zone has not yet been well defined. Although current remediation activities focus on the contamination in the perched aquifer, eventually regulatory concern is likely to turn to the residual contamination in the vadose zone. Sources of HE include the infiltration of past wastewater discharges from several HE-processing facilities through the ditch drainage system and leachate from former Landfill 3. With limited existing data on the HE distribution in the vadose zone and without preventive action, it must be assumed that residual HE could be leached into infiltrating water, providing a continuing supply of contamination to the perched aquifer. The purpose of this project was to more closely examine the fate and transport of HE in the vadose zone through mathematical modeling and laboratory experimentation. In particular, this report focuses on biodegradation as one possible fate of HE. Biodegradation of RDX in the vadose zone was studied because it is both present in highest concentration and is likely to be of the greatest regulatory concern. This study had several objectives: determine if indigenous soil organisms are capable of RDX biodegradation; determine the impact of electron acceptor availability and nutrient addition on RDX biodegradation; determine the extent of RDX mineralization (i.e., conversion to inorganic carbon) during biodegradation; and estimate the kinetics of RDX biodegradation to provide information for mathematical modeling of fate and transport.
Garten Jr, Charles T [ORNL
2012-01-01T23:59:59.000Z
Abstract. A simple, multi-compartment model was developed to predict soil carbon sequestration beneath switchgrass (Panicum virgatum) plantations in the southeastern United States. Soil carbon sequestration is an important component of sustainable switchgrass production for bioenergy because soil organic matter promotes water retention, nutrient supply, and soil properties that minimize erosion. A literature review was included for the purpose of model parameterization and five model-based experiments were conducted to predict how changes in environment (temperature) or crop management (cultivar, fertilization, and harvest efficiency) might affect soil carbon storage and nitrogen losses. Predictions of soil carbon sequestration were most sensitive to changes in annual biomass production, the ratio of belowground to aboveground biomass production, and temperature. Predictions of ecosystem nitrogen loss were most sensitive to changes in annual biomass production, the soil C/N ratio, and nitrogen remobilization efficiency (i.e., nitrogen cycling within the plant). Model-based experiments indicated that 1) soil carbon sequestration can be highly site specific depending on initial soil carbon stocks, temperature, and the amount of annual nitrogen fertilization, 2) response curves describing switchgrass yield as a function of annual nitrogen fertilization were important to model predictions, 3) plant improvements leading to greater belowground partitioning of biomass could increase soil carbon sequestration, 4) improvements in harvest efficiency have no indicated effects on soil carbon and nitrogen, but improve cumulative biomass yield, and 5) plant improvements that reduce organic matter decomposition rates could also increase soil carbon sequestration, even though the latter may not be consistent with desired improvements in plant tissue chemistry to maximize yields of cellulosic ethanol.
Tokam, A K; Tabod, C T; Nyblade, A A; Julia, J; Wiens, D A; Pasyanos, M E
2010-02-18T23:59:59.000Z
The Cameroon Volcanic Line (CVL) is a major geologic feature that cuts across Cameroon from the south west to the north east. It is a unique volcanic lineament which has both an oceanic and a continental sector and consists of a chain of Tertiary to Recent, generally alkaline volcanoes stretching from the Atlantic island of Pagalu to the interior of the African continent. The oceanic sector includes the islands of Bioko (formerly Fernando Po) and Sao Tome and Principe while the continental sector includes the Etinde, Cameroon, Manengouba, Bamboutos, Oku and Mandara mountains, as well as the Adamawa and Biu Plateaus. In addition to the CVL, three other major tectonic features characterize the region: the Benue Trough located northwest of the CVL, the Central African Shear Zone (CASZ), trending N70 degrees E, roughly parallel to the CVL, and the Congo Craton in southern Cameroon. The origin of the CVL is still the subject of considerable debate, with both plume and non-plume models invoked by many authors (e.g., Deruelle et al., 2007; Ngako et al, 2006; Ritsema and Allen, 2003; Burke, 2001; Ebinger and Sleep, 1998; Lee et al, 1994; Dorbath et al., 1986; Fairhead and Binks, 1991; King and Ritsema, 2000; Reusch et al., 2010). Crustal structure beneath Cameroon has been investigated previously using active (Stuart et al, 1985) and passive (Dorbath et al., 1986; Tabod, 1991; Tabod et al, 1992; Plomerova et al, 1993) source seismic data, revealing a crust about 33 km thick at the south-western end of the continental portion of the CVL (Tabod, 1991) and the Adamawa Plateau, and thinner crust (23 km thick) beneath the Garoua Rift in the north (Stuart et al, 1985) (Figure 1). Estimates of crustal thickness obtained using gravity data show similar variations between the Garoua rift, Adamawa Plateau, and southern part of the CVL (Poudjom et al., 1995; Nnange et al., 2000). In this study, we investigate further crustal structure beneath the CVL and the adjacent regions in Cameroon using 1-D shear wave velocity models obtained from the joint inversion of Rayleigh wave group velocities and P-receiver functions for 32 broadband seismic stations. From the 1-D shear wave velocity models, we obtain new insights into the composition and structure of the crust and upper mantle across Cameroon. After briefly reviewing the geological framework of Cameroon, we describe the data and the joint inversion method, and then interpret variations in crustal structure found beneath Cameroon in terms of the tectonic history of the region.
Dynamics of Ferrofluidic Drops Impacting Superhydrophobic Surfaces
Bolleddula, D A; Alliseda, A; Bhosale, P; Berg, J C
2010-01-01T23:59:59.000Z
This is a fluid dynamics video illustrating the impact of ferrofluidic droplets on surfaces of variable wettability. Surfaces studied include mica, teflon, and superhydrophobic. A magnet is placed beneath each surface, which modifies the behavior of the ferrofluid by applying additional downward force apart from gravity resulting in reduced droplet size and increased droplet velocity. For the superhydrophobic droplet a jetting phenomena is shown which only occurs in a limited range of impact speeds, higher than observed before, followed by amplified oscillation due to magnetic field as the drop stabilizes on the surface.
Howat, Ian M.
on acceleration and ice loss -- through fast-moving outlet glaciers that connect the inland ice sheet to the ocean-cost technologies to track the flow of glaciers and get a glimpse of what lies beneath the ice. As ice melts, water-more- This news release accompanies the press conference, "Greenland Glaciers: What Lies Beneath
Jones, Peter JS
of Climate, 21, 638 Sriver & Huber, 2007, Observational evidence for an ocean heat pump induced by tropicalThe impact of tropical cyclones (TC) on global climate is still debated. They rapidly mix the water column beneath them, bringing cold water to the surface. One way to parameterise this process
Bureau of Economic Geology
2009-04-30T23:59:59.000Z
The Bureau of Economic Geology was contracted to develop technologies that demonstrate the value of multicomponent seismic technology for evaluating deep-water hydrates across the Green Canyon area of the Gulf of Mexico. This report describes the methodologies that were developed to create compressional (P-P) and converted-shear (P-SV) images of near-seafloor geology from four-component ocean-bottom-cable (4C OBC) seismic data and the procedures used to integrate P-P and P-SV seismic attributes with borehole calibration data to estimate hydrate concentration across two study areas spanning 16 and 25 lease blocks (or 144 and 225 square miles), respectively. Approximately 200 km of two-dimensional 4C OBC profiles were processed and analyzed over the course of the 3-year project. The strategies we developed to image near-seafloor geology with 4C OBC data are unique, and the paper describing our methodology was peer-recognized with a Best Paper Award by the Society of Exploration Geophysicists in the first year of the project (2006). Among the valuable research findings demonstrated in this report, the demonstrated ability to image deep-water near-seafloor geology with sub-meter resolution using a standard-frequency (10-200 Hz) air gun array on the sea surface and 4C sensors on the seafloor has been the accomplishment that has received the most accolades from professional peers. Our study found that hydrate is pervasive across the two study areas that were analyzed but exists at low concentrations. Although our joint inversion technique showed that in some limited areas, and in some geologic units across those small areas, hydrates occupied up to 40-percent of the sediment pore space, we found that when hydrate was present, hydrate concentration tended to occupy only 10-percent to 20-percent of the pore volume. We also found that hydrate concentration tended to be greater near the base of the hydrate stability zone than it was within the central part of the stability zone.
Mapping the Seafloor American Samoa
Wright, Dawn Jeannine
-foot survey boat. The sonar sys- tem operates at an acoustic frequency of 300 kHz, fanning out as many tanker that exploded and sank in the harbor in 1949, and may still be a source of water pollution (see
Owens, T.J.; Taylor, S.R.; Zandt, G.
1983-08-08T23:59:59.000Z
We have modeled teleseismic P-waveforms recorded at three Regional Seismic Test Network (RSTN) stations (RSCP, Cumberland Plateau Observatory, TN; RSSD, Black Hills, SD; RSNY, Adirondack Mtns, NY) to determine local crustal structures. After source effects are removed by deconvolution, seismograms from events clustered in both distance and back azimuth were stacked to enhance the signal and improve confidence in interpreting converted phases at each station. Preliminary analysis indicates that seismograms from RSCP and RSNY generally exhibit less well-developed converted and reflected phases from the crust-mantle boundary than are observed at RSSD and LLNL broadband station ELK (Elko, NV). These differences are likely due to a gradational crust-mantle boundary in the eastern United States. Comparisons of seismograms recorded at the RSTN stations indicate that the waveforms at RSSD and RSCP are much more complex than waveforms from RSNY. This complexity is largely due to low-velocity sedimentary layers at the RSSD and RSCP sites, whereas RSNY is located directly on crystalline basement. At RSCP, we find a crustal thickness of 41 km, which agrees with early refraction profiles in the area. Our data require a 10 km thick transition zone between the crust and upper mantle beneath RSCP. The crustal thickness determined at RSSD is 47 to 50 km. 14 references, 10 figures, 1 table.
Jackson, D.G. Jr.
2000-01-27T23:59:59.000Z
This report presents the second phase of a baseline mapping project conducted for the Environmental Restoration Department (ERD) at Savannah River Site. The purpose of this second phase is to map the structure and distribution of mud (clay and silt-sized sediment) within the vadose zone beneath A/M Area. The results presented in this report will assist future characterization and remediation activities in the vadose zone and upper aquifer zones in A/M Area.
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
and users are interested in understanding all of these large processes and more, by examining them at the size that matters most: the pore scale. Through creation of...
Paces, J.B. (Michigan Technological Univ., Houghton (USA)); Bell, K. (Carleton Univ., Ottawa, Ontario (Canada))
1989-08-01T23:59:59.000Z
Midcontinent Rift flood basalts represent a sample of the relatively shallow, sub-continental upper mantle beneath the Canadian Shield at 1.1 Ga. A thick sequence of olivine tholeiite lavas, including minor intermediate to rhyolitic lavas, from the Portage Lake Volcanics (PLV) in northern Michigan have initial Nd and Sr isotopic compositions which cluster near Bulk Earth values. The effects of assimilation of old LREE-enriched continental crust into mantle-derived fractionating liquids are isotopically discernible in evolved lavas as well as in olivine tholeiites from the lowest portion of the volcanic pile. However, the effects of crustal contamination decrease with stratigraphic height and are absent in more primitive lavas in the upper half of the section. The source for PLV tholeiites is substantially less depleted than previously reported mantle values from the Superior Province. An origin for the PLV source is compatible with either of several mantle evolution models. The PLV source may have been associated with upwelling of a LIL element-enriched, asthenospheric plume which emplaced non-depleted material from deeper sources into the shallow sub-continental mantle beneath the Midcontinent Rift during continental break-up. Alternatively, the PLV source may have originated by enrichment of refractory sub-continental lithospheric mantle which was previously depleted in incompatible trace elements during Archean-aged melt extraction and continental crust formation. Concurrent generation of carbonatite magmas in other areas beneath the Superior Province indicates the widespread presence of sub-continental mantle with substantially higher {epsilon}{sub Nd}(T) and lower {epsilon}{sub Sr}(T) than the PLV source.
Broader source: Energy.gov [DOE]
AIKEN, S.C. – Workers recently completed a multiyear project that removed more than 33,000 gallons of non-radioactive chemical solvents from beneath a portion of the Savannah River Site (SRS), preventing those pollutants from entering the local water table and helping the site avoid costs of more than $15 million.
Menke, William
Journal of Geology and Geophysics. 7; 3, Pages 529-542. 1964. Allen,-R-M., The mantle plume beneath-frequency traveltimes; I, Theory, Geophysical Journal International. 141; 1, Pages 157-174. 2000. Forsyth-D-W , Rayleigh Wave Phase Velocity Variations in a Regionalized Pacific, Eos, Transactions, American Geophysical Union
Complex Dynamics Bernardo Da Costa, Koushik Ramachandran, Jingjing Qu, and I had a two semester learning seminar in complex analysis and potential ...
Zeghib, Abdelghani
Introduction Results Linear Dynamics Lorentz Dynamics Actions of discrete groups on stationary Piccione) Geodeycos Meeting, Lyon, 28-30 April 2010 Abdelghani Zeghib Dynamics on Lorentz manifolds #12;Introduction Results Linear Dynamics Lorentz Dynamics Motivations and questions Examples 1 Introduction
Classification of Seafloor Habitats using Genetic Programming
Fernandez, Thomas
habitats. The initial motivation to use GP for this task came from a work on diesel engine diagnosis [11 are not made or distributed for profit or commercial advantage and that copies bear this notice and the full
A New Seafloor Gravimeter Glenn Sasagawa1
Nooner, Scott
, Paris, 75252, France. E-mail: crawford@sismo1.ipgp.jussieu.fr 3 Statoil Research and Development Centre
Deformation mechanisms beneath shallow foundations
McMahon, Brendan
2013-02-05T23:59:59.000Z
Nomenclature Roman Symbols A area b empirical exponent C methyl-cellulose concentration (%) C? secondary compression index cu undrained shear strength cv one-dimensional coefficient of consolidation D foundation diameter D10, D50, D90 sand grain diameter 10... . . . . . . . . . . . . . . . . . . . . 39 xiii LIST OF FIGURES 2.13 Method to find coefficient of secondary compression and time at end of primary consolidation (modified Augustesen et al., 2004) . . . . . . . . 42 2.14 Prandtl (1921) mechanism adopted for the displacement pattern (from...
Global ClimateGlobal Climate meets dynamics inmeets dynamics in
texture.texture. Here we will go to high latitudes for examples, whereHere we will go to high latitudes Arctic basin. From satellite passive microwave radiometer.meter. #12;Beneath the ocean surface, moisture flux, heat fluxwinds, moisture flux, heat flux meridionalmeridional energy transportenergy
Introduction to Dynamic Distributed
Roma "La Sapienza", Università di
Introduction to Dynamic Distributed SystemsSystems #12;Outline Introduction Churn Building Applications in Dynamic Distributed Systems RegistersRegisters Eventual Leader election Connectivity in Dynamic Distributed Systems #12;Dynamic Distributed Systems: Context & Motivations Advent of Complex Distributed
Michael Murray; for the BRAHMS Collaboration
2007-10-24T23:59:59.000Z
The purpose of BRAHMS is to survey the dynamics of relativistic heavy ion (as well as pp and d-A) collisions over a very wide range of rapidity and transverse momentum. The sum of these data may give us a glimpse of the initial state of the system, its transverse and longitudinal evolution and how the nature of the system changes with time. Here I will concentrate on the origin and dynamics of the light flavors, i.e. the creation and transport of the up, down and strange quarks. The results presented here are certainly not the end of the story. It is my hope that in a few years new detectors will reveal the rapidity dependence of the charm and bottom quarks.
Fisher, Andrew
records of formation properties The addition of logging while drilling technology where logging tools to exciting scientific discoveries through ocean drilling Essentially all studies of fluid flow within for new approaches or techniques The following highlights selected from recent studies of seafloor fluids
Hyperbolic Dynamics Todd Fisher
Fisher, Todd
Hyperbolic Dynamics Todd Fisher tfisher@math.umd.edu Department of Mathematics University of Maryland, College Park Hyperbolic Dynamics p. 1/3 #12;What is a dynamical system? Phase space X, elements possible states Hyperbolic Dynamics p. 2/3 #12;What is a dynamical system? Phase space X, elements
The Microscopic Linear Dynamics
Penny, Will
The Microscopic Brain Will Penny Linear Dynamics Exponentials Matrix Exponential Eigendecomposition Dynamical Modes Nodes State Space Saddles Oscillations Spirals Centres Offsets Retinal Circuit Nullclines Stability Spiking Neurons Fitzhugh-Nagumo Nonlinear Dynamics Linearization Nonlinear Oscillation Excitable
The Dynamics of Fluid Flow and Associated Chemical Fluxes at Active Continental Margins
Solomon, Evan A
2007-01-01T23:59:59.000Z
Hill: implications for gas-and hydrate-rich environments.injection of gas and hydrate/carbonate precipitation willwith a seafloor gas hydrate deposit on the northern Gulf of
The Dynamics of fluid flow and associated chemical fluxes at active continental margins
Solomon, Evan Alan
2007-01-01T23:59:59.000Z
Hill: implications for gas-and hydrate-rich environments.injection of gas and hydrate/carbonate precipitation willwith a seafloor gas hydrate deposit on the northern Gulf of
Protein Dynamics and Biocatalysis
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Protein Dynamics and Biocatalysis Protein Dynamics and Biocatalysis 1998 Annual Report Grand Challenge Projects biocatalysis.gif A model of the Michaelis complex for the TEM-1...
Knoll, Jörn
Dynamics of Resonances GSI, 18.05.2005 Motivations Thermal Equilibrium -N- vectormesons Di-leptons Towards dynamics Conserving -functional Gradient ap- proximation Quantum Kinetic Equation Summary Dynamics. Voskresensky1,3 1GSI 2Kurchatov Inst. (Moscow) 3Moscow Ins. for Physics and Engineering #12;Dynamics
Zeghib, Abdelghani
Dynamics on Lorentz manifolds Abdelghani Zeghib Introduction Motivations and questions Examples Results Results Previous results Linear Dynamics General considerations Furstenberg Lemma Lorentz Dynamics://www.umpa.ens-lyon.fr/~zeghib/ (joint work with Paolo Piccione) #12;Dynamics on Lorentz manifolds Abdelghani Zeghib Introduction
LaCasce, Joseph H.
Introduction Basic dynamics The Gulf Stream The thermohaline circulation Ocean currents: some misconceptions and some dynamics Joe LaCasce Dept. Geosciences October 30, 2012 Joe LaCasce Dept. Geosciences Ocean currents: some misconceptions and some dynamics #12;Introduction Basic dynamics The Gulf Stream
Should Thermostatted Ring Polymer Molecular Dynamics be used to calculate reaction rates?
Hele, Timothy J H
2015-01-01T23:59:59.000Z
We apply Thermostatted Ring Polymer Molecular Dynamics (TRPMD), a recently-proposed approximate quantum dynamics method, to the computation of thermal reaction rates. Its short-time Transition-State Theory (TST) limit is identical to rigorous Quantum Transition-State Theory, and we find that its long-time limit is independent of the location of the dividing surface. TRPMD rate theory is then applied to one-dimensional model systems, the atom-diatom bimolecular reactions H+H$_2$, D+MuH and F+H$_2$, and the prototypical polyatomic reaction H+CH$_4$. Above the crossover temperature, the TRPMD rate is virtually invariant to the strength of the friction applied to the internal ring-polymer normal modes, and beneath the crossover temperature the TRPMD rate generally decreases with increasing friction, in agreement with the predictions of Kramers theory. We therefore find that TRPMD is less accurate than Ring Polymer Molecular Dynamics (RPMD) for symmetric reactions, and in certain asymmetric systems closer to the q...
Tariffs with Dynamic Supply Response
Karp, Larry
1985-01-01T23:59:59.000Z
Giannini FDN iibrary TARIFFS WITH DYNAMIC SUPPLY RESWNSEpaper studies the optimal tariff in a dynamic framework. Thesellers, the optimal tariff is dynam- ically inconsistent;
Dynamics of structural priming
Malhotra, Gaurav
2009-01-01T23:59:59.000Z
for understanding various aspects of syntactic priming. Cognitive processes are modelled as dynamical systems that can change their behaviour when they process information. We use these dynamical systems to investigate how each episode of language comprehension...
Categorical Introduction to Dynamical Systems Symbolic Dynamical Systems
Kahng, Byung-Jay
Categorical Introduction to Dynamical Systems Symbolic Dynamical Systems Symbolic Embedding Examples Results Embeddings in Symbolic Dynamical Systems Jonathan Jaquette Swarthmore College July 22, 2009 Jonathan Jaquette Embeddings in Symbolic Dynamical Systems #12;Categorical Introduction
Eric Bergshoeff; Joaquim Gomis; Giorgio Longhi
2014-05-31T23:59:59.000Z
We investigate particles whose dynamics is invariant under the Carroll group. Although a single free such Carroll particle has no non-trivial dynamics (`the Carroll particle does not move') we show that there exists non-trivial dynamics for a set of interacting Carroll particles. Furthermore, we gauge the Carroll algebra and couple the Carroll particle to these gauge fields. It turns out that for such a coupled system even a single Carroll particle can have non-trivial dynamics.
Dynamics of Anisotropic Universes
Jerome Perez
2006-03-30T23:59:59.000Z
We present a general study of the dynamical properties of Anisotropic Bianchi Universes in the context of Einstein General Relativity. Integrability results using Kovalevskaya exponents are reported and connected to general knowledge about Bianchi dynamics. Finally, dynamics toward singularity in Bianchi type VIII and IX universes are showed to be equivalent in some precise sence.
Barrett, Jeffrey A.
Social Dynamics Introduction Part I: Correlation and the Social Contract Introduction to part I 1: University of Utah Press. 47-69. Part II: Importance of Dynamics Introduction to part II 1. Trust, Risk Significance of Some Simple Evolutionary Models (2000) Philosophy of Science 67: 94-113. 4. Dynamics
Atmospheric Dynamics II Instructor
AT602 Atmospheric Dynamics II 2 credits Instructor: David W. J. Thompson davet: An Introduction to Dynamic Meteorology, 5th Edition, Academic Press (recommended) Â· Marshall, J., and Plumb, R. A., 2008: Atmosphere, Ocean, and Climate Dynamics: An Introductory Text, Academic Press. Â· Vallis, G. K
Intramolecular and nonlinear dynamics
Davis, M.J. [Argonne National Laboratory, IL (United States)
1993-12-01T23:59:59.000Z
Research in this program focuses on three interconnected areas. The first involves the study of intramolecular dynamics, particularly of highly excited systems. The second area involves the use of nonlinear dynamics as a tool for the study of molecular dynamics and complex kinetics. The third area is the study of the classical/quantum correspondence for highly excited systems, particularly systems exhibiting classical chaos.
Cybersecurity Dynamics Shouhuai Xu
Xu, Shouhuai
Antonio ABSTRACT We explore the emerging field of Cybersecurity Dynamics, a candidate foundation been driving the study of security for decades -- the idea of cybersecurity dynamics emergedCybersecurity Dynamics Shouhuai Xu Department of Computer Science, University of Texas at San
17. METAPOPULATION DYNAMICS OF
17. METAPOPULATION DYNAMICS OF INFECTIOUS DISEASES Matt J. Keeling, Ottar N. Bjørnstad, and Bryan T resonances for the dynamics of parasites. This is particularly true for microparasitic infections" growth of the parasite population. Thus, at the scale of the host popu- lation, infectious dynamics bears
Slow dynamics and anomalous nonlinear fast dynamics in diverse solids
Slow dynamics and anomalous nonlinear fast dynamics in diverse solids Paul Johnsona) Geophysics study of anomalous nonlinear fast dynamics and slow dynamics in a number of solids. Observations are presented from seven diverse materials showing that anomalous nonlinear fast dynamics ANFD and slow dynamics
Crisman, D.P.; Jacobs, G.K.
1982-01-01T23:59:59.000Z
Copper deposits in the Portage Lake Volcanics of northern Michigan have been evaluated as a natural analogue for canister material to be emplaced in a nuclear waste repository located in the basalts beneath the Hanford Site near Richland, Washington. Te native copper, which precipitated from high temperature (200/sup 0/C to 300/sup 0/C) hydrothermal solutions between 500 and 800 million yr ago, has remained relatively unaltered in the Portage lake basalt-groundwater system. The results of this study illustrate the stability of copper in solutions of moderate pH, low to moderate Eh, and low total dissolved solids. Chemical trends and geochemical modeling of te near-surface waters suggestthat similarities (moderate pH, low E, low total dissolved solids) exist between the groundwater-basalt system of the Keweenaw Peninsula and the groundwater-basalt system at the Hanford Site. These similarities and the stability of copper in the Keweenswan basalts imply that copper alloys are adequate materials for nuclear waste canisters emplaced in a repository located in basalt.
Dynamical friction in modified Newtonian dynamics
C. Nipoti; L. Ciotti; J. Binney; P. Londrillo
2008-03-31T23:59:59.000Z
We have tested a previous analytical estimate of the dynamical friction timescale in Modified Newtonian Dynamics (MOND) with fully non-linear N-body simulations. The simulations confirm that the dynamical friction timescale is significantly shorter in MOND than in equivalent Newtonian systems, i.e. systems with the same phase-space distribution of baryons and additional dark matter. An apparent conflict between this result and the long timescales determined for bars to slow and mergers to be completed in previous N-body simulations of MOND systems is explained. The confirmation of the short dynamical-friction timescale in MOND underlines the challenge that the Fornax dwarf spheroidal poses to the viability of MOND.
Shape Dynamics. An Introduction
Julian Barbour
2011-05-01T23:59:59.000Z
Shape dynamics is a completely background-independent universal framework of dynamical theories from which all absolute elements have been eliminated. For particles, only the variables that describe the shapes of the instantaneous particle configurations are dynamical. In the case of Riemannian three-geometries, the only dynamical variables are the parts of the metric that determine angles. The local scale factor plays no role. This leads to a shape-dynamic theory of gravity in which the four-dimensional diffeomorphism invariance of general relativity is replaced by three-dimensional diffeomorphism invariance and three-dimensional conformal invariance. Despite this difference of symmetry groups, it is remarkable that the predictions of the two theories -- shape dynamics and general relativity -- agree on spacetime foliations by hypersurfaces of constant mean extrinsic curvature. However, the two theories are distinct, with shape dynamics having a much more restrictive set of solutions. There are indications that the symmetry group of shape dynamics makes it more amenable to quantization and thus to the creation of quantum gravity. This introduction presents in simple terms the arguments for shape dynamics, its implementation techniques, and a survey of existing results.
Lee, Ian
2012-01-01T23:59:59.000Z
SANTA CRUZ DYNAMIC INSTRUCTION FUSION A thesis submitted in4 2.2 Instruction Fusion & Complex10 3.1 Fusion Selection
Nanoindentation Under Dynamic Conditions
Wheeler, Jeffrey M
2009-05-22T23:59:59.000Z
............................................................................................ 98 6.3.1 Data Analysis ........................................................................................... 99 6.3.2 Dynamic Compliance ............................................................................. 103 6.3.3 Strain Rates...
Logunova, V.A.; Rudenko, V.V.; Radionov, A.K.; Sokolov, I.B.
1994-12-01T23:59:59.000Z
Recommendations for evaluating the dynamic strength of concrete structures at hydroelectric power stations are given. Both existing and planned structures are addressed. Equations are provided for determing the design compressive and tensile strength of concrete. A formula is provided for determining design dynamic strength of concrete of various ages under uniform compression. 3 refs., 1 fig., 2 tabs.
Relational Dynamic Bayesian Networks
Domingos, P; Weld, D; 10.1613/jair.1625
2011-01-01T23:59:59.000Z
Stochastic processes that involve the creation of objects and relations over time are widespread, but relatively poorly studied. For example, accurate fault diagnosis in factory assembly processes requires inferring the probabilities of erroneous assembly operations, but doing this efficiently and accurately is difficult. Modeled as dynamic Bayesian networks, these processes have discrete variables with very large domains and extremely high dimensionality. In this paper, we introduce relational dynamic Bayesian networks (RDBNs), which are an extension of dynamic Bayesian networks (DBNs) to first-order logic. RDBNs are a generalization of dynamic probabilistic relational models (DPRMs), which we had proposed in our previous work to model dynamic uncertain domains. We first extend the Rao-Blackwellised particle filtering described in our earlier work to RDBNs. Next, we lift the assumptions associated with Rao-Blackwellization in RDBNs and propose two new forms of particle filtering. The first one uses abstracti...
Los Alamos Dynamics Summer School
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
School The Sixteenth Los Alamos Dynamics Summer School EXTENDED DEADLINES Los Alamos Dynamics Summer School Overview Contact Institute Director Charles Farrar (505) 663-5330...
Studies in Nonlinear Dynamics & Econometrics
Studies in Nonlinear Dynamics & Econometrics Volume 8, Issue 3 2004 Article 1 The Long Memory in Nonlinear Dynamics & Econometrics is produced by The Berkeley Electronic Press (bepress). http
Dynamic Prediction of Concurrency Errors
Sadowski, Caitlin
2012-01-01T23:59:59.000Z
Relation 15 Must-Before Race Prediction 16 Implementation 17viii Abstract Dynamic Prediction of Concurrency Errors bySANTA CRUZ DYNAMIC PREDICTION OF CONCURRENCY ERRORS A
Predicting Groundwater Contamination beneath Stormwater Infiltration
Clark, Shirley E.
, Penn State Harrisburg Robert Pitt, University of Alabama Pollutants of Concern · Classes of stormwater
SCATTERING BY CRACKS BENEATH FLUIDSOLID INTERFACES
Craster, Richard
parameters relevant for watermetal and waterrock combinations are taken and far field scattering patterns the fluid. For line source excitation surface waves are generated that impinge upon defects near the surface with distance along the interface from its source of excitation. The light fluid loading limit is important f
Long Fingers of Heat Beneath Earth's Surface
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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Science (SC)Integrated Codes |Is Your HomeLatestCenterLogging in Logging inLogistics UserAbout
Clark, Andy
1997-01-01T23:59:59.000Z
Recent studies such as Thelen and Smith (1994), Kelso (1995), Van Gelder (1995), Beer (1995), and others have presented a forceful case for a dynamical systems approach to understanding cognition and adaptive behavior. ...
Dynamics in Formal Argumentation
Carbogim, Daniela Vasconcelos
by constructing and weighing up arguements intended to give support in favour or against alternative conclusions. In dynamic argumentation, such arguements may be revised and strengthened in order yo increase to decrease the acceptability of controversial...
Louis Reese; Anna Melbinger; Erwin Frey
2015-05-05T23:59:59.000Z
Here we study a driven lattice gas model for microtubule depolymerizing molecular motors, where traffic jams of motors induce stochastic switching between microtubule growth and shrinkage. We term this phenomenon \\enquote{traffic dynamic instability} because it is reminiscent of microtubule dynamic instability [T. Mitchison and M. Kirschner, Nature 312, 237 (1984)]. The intermittent dynamics of growth and shrinking emerges from the interplay between the arrival of motors at the microtubule tip, motor induced depolymerization, and motor detachment from the tip. The switching dynamics correlates with low and high motor density on the lattice. This leads to an effectively bistable particle density in the system. A refined domain wall theory predicts this transient appearance of different phases in the system. The theoretical results are supported by stochastic simulations.
Reese, Louis; Frey, Erwin
2015-01-01T23:59:59.000Z
Here we study a driven lattice gas model for microtubule depolymerizing molecular motors, where traffic jams of motors induce stochastic switching between microtubule growth and shrinkage. We term this phenomenon \\enquote{traffic dynamic instability} because it is reminiscent of microtubule dynamic instability [T. Mitchison and M. Kirschner, Nature 312, 237 (1984)]. The intermittent dynamics of growth and shrinking emerges from the interplay between the arrival of motors at the microtubule tip, motor induced depolymerization, and motor detachment from the tip. The switching dynamics correlates with low and high motor density on the lattice. This leads to an effectively bistable particle density in the system. A refined domain wall theory predicts this transient appearance of different phases in the system. The theoretical results are supported by stochastic simulations.
Dynamics of Nanoconfined Acetonitrile
Norton, Cassandra
2011-04-27T23:59:59.000Z
The results of dynamics simulations of confined acetonitrile are presented. Confinement is achieved by filling previously formed silica pores having hydroxyl-terminated head groups with liquid acetonitrile. These pores are of the same nominal radius...
Numerical model for steel catenary riser on seafloor support
You, Jung Hwan
2007-04-25T23:59:59.000Z
on catenary riser and stresses in riser pipe at the touch down point (TDP) was conducted over 3 months at Watchet Harbor in the west of England by the STRIDE ? JIP, 2H Offshore Engineering Ltd in 2000 (Willis and West, 2001). The purpose of the full... published data and data from the pipe and soil interaction experiments conducted within the STRIDE and CARISIMA JIP?s. They describe an example of the development of a pipe and soil interaction curve with an unloading and reloading cycle, as presented...
Seafloor anchoring for platforms in the Messina Strait
Manno, Antonioluca
2010-01-01T23:59:59.000Z
The importance of properly designing and selecting an anchor is key to reliable techniques for floating offshore platforms including power generation from marine currents. Numerous studies have demonstrated how the uplift ...
Numerical Modeling of Seafloor Interation with Steel Catenary Riser
You, Jung Hwan
2012-10-19T23:59:59.000Z
degradation it is possible to simulate the trench formation process and estimate deflections and moments along the riser length. The seabed model is used to perform parametric studies to assess the effects of stiffness, soil strength, amplitude of pipe...
MMS 2007-035 Seafloor Characteristics and Distribution
Mathis, Wayne N.
and 2005 MMS cruises; S. Bird, S. Munsell and J. Whitworth all from Oryx Energy Company, Dallas, Texas and graphics production, Carolyn Wood for graphics support and Greg Boland, the MMS COTR, for his initial
Physical properties of seafloor sediments from the Russian Pechora Sea
Sarmiento, Sergio Eduardo
1996-01-01T23:59:59.000Z
of Boulder Clay deposits within the study area, solving the long controversy regarding the marine or glacial origin for these late Pleistocene deposits in the Pechora area. An evaluation of the influence of the Novaya Zemlya and Scandinavian ice masses...
Microbial Life on the Seafloor: Where's the Energy?
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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHighand Retrievals fromprocess used in
Photochemical reaction dynamics
Moore, B.C. [Lawrence Berkeley Laboratory, Livermore, CA (United States)
1993-12-01T23:59:59.000Z
The purpose of the program is to develop a fundamental understanding of unimolecular and bimolecular reaction dynamics with application in combustion and energy systems. The energy dependence in ketene isomerization, ketene dissociation dynamics, and carbonyl substitution on organometallic rhodium complexes in liquid xenon have been studied. Future studies concerning unimolecular processes in ketene as well as energy transfer and kinetic studies of methylene radicals are discussed.
Faruqui, Ahmad
2010-07-15T23:59:59.000Z
Dynamic pricing has garnered much interest among regulators and utilities, since it has the potential for lowering energy costs for society. But the deployment of dynamic pricing has been remarkably tepid. The underlying premise is that dynamic pricing is unfair. But the presumption of unfairness in dynamic pricing rests on an assumption of fairness in today's tariffs. (author)
CSE Master Specialization Fluid Dynamics
Lang, Annika
CSE Master Specialization Fluid Dynamics Course Semester Fluid Dynamics II HS Quantitative Flow Energie- und Verfahrenstechnik FS Biofluiddynamics FS #12;CSE in Fluid Dynamics: Very large high in Fluid Dynamics: Physiology of the inner ear MicroCT imaging Multilayer MFS for Stokes flow simulations
Dynamics and Equilibria Sergiu Hart
Dynamics and Equilibria Sergiu Hart Presidential Address, GAMES 2008 (July 2008) Revised and Expanded (November 2009) Revised (2010, 2011, 2012, 2013) SERGIU HART c 2008 p. #12;DYNAMICS.D. Dissertation, Princeton 1950 SERGIU HART c 2008 p. #12;Dynamics SERGIU HART c 2008 p. #12;Dynamics FACT
September 23, 2004 Volume 1, Issue 21
Rhode Island, University of
," she says. "Now the challenge is to bring those best practices into the classroom." More... University an ocean drilling expedition dedicated to the exploration of life beneath the seafloor. They discovered will feature a best-selling author, as well as discussions on computer crime, terrorism and the federal secret
L. R. G. Fontes; C. M. Newman; K. Ravishankar; E. Schertzer
2007-04-20T23:59:59.000Z
The dynamical discrete web (DDW), introduced in recent work of Howitt and Warren, is a system of coalescing simple symmetric one-dimensional random walks which evolve in an extra continuous dynamical parameter s. The evolution is by independent updating of the underlying Bernoulli variables indexed by discrete space-time that define the discrete web at any fixed s. In this paper, we study the existence of exceptional (random) values of s where the paths of the web do not behave like usual random walks and the Hausdorff dimension of the set of such exceptional s. Our results are motivated by those about exceptional times for dynamical percolation in high dimension by H\\"aggstrom, Peres and Steif, and in dimension two by Schramm and Steif. The exceptional behavior of the walks in DDW is rather different from the situation for dynamical random walks of Benjamini, H\\"aggstrom, Peres and Steif. In particular, we prove that there are exceptional values of s for which the walk from the origin S^s(n) has limsup S^s(n)/\\sqrt n \\leq K with a nontrivial dependence of the Hausdorff dimension on K. We also discuss how these and other results extend to the dynamical Brownian web, a natural scaling limit of DDW. The scaling limit is the focus of a paper in preparation; it was studied by Howitt and Warren and is related to the Brownian net of Sun and Swart.
Dynamical tunneling and control
Srihari Keshavamurthy
2011-07-25T23:59:59.000Z
This article summarizes the recent work on the influence of dynamical tunneling on the control of quantum systems. Specifically, two examples are discussed. In the first, it is shown that the bichromatic control of tunneling in a driven double well system is hampered by the phenomenon of chaos-assisted tunneling. The bichromatic control landscape exhibits several regions indicating lack of control with every such region involving chaos-assisted tunneling. The second example illustrates the failure of controlling the dissociation dynamics of a driven Morse oscillator due to the phenomenon of resonance-assisted tunneling. In particular, attempts to control the dissociation dynamics by rebuilding local phase space barriers are foiled due to resonance-assisted tunneling.
Sean A. Hayward
2009-02-28T23:59:59.000Z
This is a review of current theory of black-hole dynamics, concentrating on the framework in terms of trapping horizons. Summaries are given of the history, the classical theory of black holes, the defining ideas of dynamical black holes, the basic laws, conservation laws for energy and angular momentum, other physical quantities and the limit of local equilibrium. Some new material concerns how processes such as black-hole evaporation and coalescence might be described by a single trapping horizon which manifests temporally as separate horizons.
Substructured multibody molecular dynamics.
Grest, Gary Stephen; Stevens, Mark Jackson; Plimpton, Steven James; Woolf, Thomas B. (Johns Hopkins University, Baltimore, MD); Lehoucq, Richard B.; Crozier, Paul Stewart; Ismail, Ahmed E.; Mukherjee, Rudranarayan M. (Rensselaer Polytechnic Institute, Troy, NY); Draganescu, Andrei I.
2006-11-01T23:59:59.000Z
We have enhanced our parallel molecular dynamics (MD) simulation software LAMMPS (Large-scale Atomic/Molecular Massively Parallel Simulator, lammps.sandia.gov) to include many new features for accelerated simulation including articulated rigid body dynamics via coupling to the Rensselaer Polytechnic Institute code POEMS (Parallelizable Open-source Efficient Multibody Software). We use new features of the LAMMPS software package to investigate rhodopsin photoisomerization, and water model surface tension and capillary waves at the vapor-liquid interface. Finally, we motivate the recipes of MD for practitioners and researchers in numerical analysis and computational mechanics.
(Quantum Molecular Dynamics Method) (Classical Molecular Dynamics Method)
Maruyama, Shigeo
1-1 (Quantum Molecular Dynamics Method) (Classical Molecular Dynamics Method) 2) Verlet(Verlet's leap frog) (17)(18) ( ) i i ii m t t t t t t F vv + -= + 22 (17
Biological Interactions and Dynamics Workshop | EMSL
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Biological Interactions and Dynamics Workshop Biological Interactions and Dynamics Workshop Wiley HS, Kaplan S. 2011. "Biological Interactions and Dynamics Science Theme Advisory...
Introduction to Structure and Dynamics: Inaugural Issue
White, Douglas R.; Manlove, Robert; Colby, B. N.; Garfias, Robert; Bell, Duran
2005-01-01T23:59:59.000Z
the premier issue of Structure and Dynamics, an electronicFor this great boon, Structure and Dynamics in particular iselectronic journals, Structure and Dynamics will be widely
Weeks, Eric R.
NEWS & VIEWS Glass dynamics Diverging views on glass transition Gregory B. mc.mckenna@ttu.edu T he glass transition is one of the most intriguing phenomena in the world of soft condensed matter. Despite decades of study, many aspects of the behaviour of glass-forming liquids remain elusive
Electronic Spectroscopy & Dynamics
Mark Maroncelli, Nancy Ryan Gray
2010-06-08T23:59:59.000Z
The Gordon Research Conference (GRC) on Electronic Spectroscopy and Dynamics was held at Colby College, Waterville, NH from 07/19/2009 thru 07/24/2009. The Conference was well-attended with participants (attendees list attached). The attendees represented the spectrum of endeavor in this field coming from academia, industry, and government laboratories, both U.S. and foreign scientists, senior researchers, young investigators, and students. The GRC on Electronic Spectroscopy & Dynamics showcases some of the most recent experimental and theoretical developments in electronic spectroscopy that probes the structure and dynamics of isolated molecules, molecules embedded in clusters and condensed phases, and bulk materials. Electronic spectroscopy is an important tool in many fields of research, and this GRC brings together experts having diverse backgrounds in physics, chemistry, biophysics, and materials science, making the meeting an excellent opportunity for the interdisciplinary exchange of ideas and techniques. Topics covered in this GRC include high-resolution spectroscopy, biological molecules in the gas phase, electronic structure theory for excited states, multi-chromophore and single-molecule spectroscopies, and excited state dynamics in chemical and biological systems.
Tools for dynamic model development
Schaber, Spencer Daniel
2014-01-01T23:59:59.000Z
For this thesis, several tools for dynamic model development were developed and analyzed. Dynamic models can be used to simulate and optimize the behavior of a great number of natural and engineered systems, from the ...
Dynamical entanglement versus symmetry and dynamics of classical approximations
Buric, Nikola [Department of Physics and Mathematics, Faculty of Pharmacy, University of Beograd, Vojvode Stepe 450, 11000 Belgrade (Serbia and Montenegro)
2006-05-15T23:59:59.000Z
It is shown that dynamical entanglement between two qubits depends on the symmetry of the quantum model. On the other hand, the latter is reflected in the qualitative properties of the dynamics of a classical approximation of the quantum system. For generic separable pure initial states, the dynamical entanglement is larger if the system is less symmetric and its classical approximation is chaotic. The influence of different types of Markov environments on the established relation between the dynamical entanglement, symmetry and the classical dynamics is also studied.
Trade Liberalization And Poverty Dynamics
Paris-Sud XI, Université de
Trade Liberalization And Poverty Dynamics in Vietnam 2002-2006 Barbara COELLO World Bank Madior-28Mar2014 #12;1 Trade liberalization and poverty dynamics in Vietnam 2002-2006 Barbara Coello, the World liberalization and poverty dynamics in Vietnam 2002-2006 Abstract This paper shows the evolution of poverty
FLUCTUATIONS AND SIMPLE CHAOTIC DYNAMICS
FLUCTUATIONS AND SIMPLE CHAOTIC DYNAMICS J.P. CRUTCHFIELD and J.D. FARMER Physics Board of Studies FLUCTUATIONS AND SIMPLE CHAOTIC DYNAMICS J.P. CRUTCHFIELD and J.D. FARMER* Physics Board of Studies, Universiiy anharmonic oscillator 76 2. Dynamics in the absence of fluctuations 48 Appendix B. Characteristic exponents
Photodissociation Dynamics Laurie J. Butler*
Butler, Laurie J.
Photodissociation Dynamics Laurie J. Butler* Department of Chemistry, UniVersity of Chicago of photodissociation dynamics over the past 30 years are reviewed. An overview of experimental techniques that have of photodissociation dynamics has grown explo- sively in the past few decades. Spearheaded by developments in laser
Centre de recherche KNOWLEDGE DYNAMICS
Paris-Sud XI, Université de
Centre de recherche KNOWLEDGE DYNAMICS DURING PLANNING PRACTICES MARIE-LÉANDRE GOMEZ DR09011 or part of this document without the written consent of the authors. - DR 09011 - Knowledge Dynamics Hirsch, BP5021, 95021 CERGY PONTOISE, France. E-mail: gomez@essec.fr I #12;Knowledge Dynamics During
Galactic Dynamics James Binney and
Landweber, Laura
Galactic Dynamics James Binney and Scott Tremaine Two of the world's lead- ing astrophysicists describes our present un- derstanding of the struc- ture and dynamics of stellar systems such as galaxies and star clusters. Nicknamed "the Bible of galactic dynamics," this book has be- come a classic treatise
FPGA Acceleration of Discrete Molecular Dynamics Simulation
Herbordt, Martin
' & $ % FPGA Acceleration of Discrete Molecular Dynamics Simulation Joshua Model Thesis submitted UNIVERSITY COLLEGE OF ENGINEERING Thesis FPGA Acceleration of Discrete Molecular Dynamics Simulation Acceleration of Discrete Molecular Dynamics Simulation Joshua Model ABSTRACT Molecular dynamics simulation
Mesoscale ocean dynamics modeling
mHolm, D.; Alber, M.; Bayly, B.; Camassa, R.; Choi, W.; Cockburn, B.; Jones, D.; Lifschitz, A.; Margolin, L.; Marsden, L.; Nadiga, B.; Poje, A.; Smolarkiewicz, P. [Los Alamos National Lab., NM (United States); Levermore, D. [Arizona Univ., Tucson, AZ (United States)
1996-05-01T23:59:59.000Z
This is the final report of a three-year, Laboratory-Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). The ocean is a very complex nonlinear system that exhibits turbulence on essentially all scales, multiple equilibria, and significant intrinsic variability. Modeling the ocean`s dynamics at mesoscales is of fundamental importance for long-time-scale climate predictions. A major goal of this project has been to coordinate, strengthen, and focus the efforts of applied mathematicians, computer scientists, computational physicists and engineers (at LANL and a consortium of Universities) in a joint effort addressing the issues in mesoscale ocean dynamics. The project combines expertise in the core competencies of high performance computing and theory of complex systems in a new way that has great potential for improving ocean models now running on the Connection Machines CM-200 and CM-5 and on the Cray T3D.
Characterizing Microbial Community and Geochemical Dynamics at...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Microbial Community and Geochemical Dynamics at Hydrothermal Vents Using Osmotically Driven Continuous Fluid Characterizing Microbial Community and Geochemical Dynamics at...
Kuramoto dynamics in Hamiltonian systems
Dirk Witthaut; Marc Timme
2013-05-08T23:59:59.000Z
The Kuramoto model constitutes a paradigmatic model for the dissipative collective dynamics of coupled oscillators, characterizing in particular the emergence of synchrony. Here we present a classical Hamiltonian (and thus conservative) system with 2N state variables that in its action-angle representation exactly yields Kuramoto dynamics on N-dimensional invariant manifolds. We show that the synchronization transition on a Kuramoto manifold emerges where the transverse Hamiltonian action dynamics becomes unstable. The uncovered Kuramoto dynamics in Hamiltonian systems thus distinctly links dissipative to conservative dynamics.
Dynamical Methods in Algebra Dynamical Methods in Algebra [1] Dynamical Methods in Algebra
Coquand, Thierry
Dynamical Methods in Algebra Dynamical Methods in Algebra [1] Dynamical Methods in Algebra We present a possible realisation of Hilbert's program for (some part of) abstract algebra G in number theory) that cannot be eliminated Surprisingly this is not the case for abstract algebra 1 #12
Dynamic radioactive particle source
Moore, Murray E.; Gauss, Adam Benjamin; Justus, Alan Lawrence
2012-06-26T23:59:59.000Z
A method and apparatus for providing a timed, synchronized dynamic alpha or beta particle source for testing the response of continuous air monitors (CAMs) for airborne alpha or beta emitters is provided. The method includes providing a radioactive source; placing the radioactive source inside the detection volume of a CAM; and introducing an alpha or beta-emitting isotope while the CAM is in a normal functioning mode.
Ekdahl, Carl
2015-01-01T23:59:59.000Z
Beam dynamics issues are assessed for a new linear induction electron accelerator being designed for flash radiography of large explosively driven hydrodynamic experiments. Special attention is paid to equilibrium beam transport, possible emittance growth, and beam stability. It is concluded that a radiographic quality beam will be produced possible if engineering standards and construction details are equivalent to those on the present radiography accelerators at Los Alamos.
Modal aerosol dynamics modeling
Whitby, E.R.; McMurry, P.H.; Shankar, U.; Binkowski, F.S.
1991-02-01T23:59:59.000Z
The report presents the governing equations for representing aerosol dynamics, based on several different representations of the aerosol size distribution. Analytical and numerical solution techniques for these governing equations are also reviewed. Described in detail is a computationally efficient numerical technique for simulating aerosol behavior in systems undergoing simultaneous heat transfer, fluid flow, and mass transfer in and between the gas and condensed phases. The technique belongs to a general class of models known as modal aerosol dynamics (MAD) models. These models solve for the temporal and spatial evolution of the particle size distribution function. Computational efficiency is achieved by representing the complete aerosol population as a sum of additive overlapping populations (modes), and solving for the time rate of change of integral moments of each mode. Applications of MAD models for simulating aerosol dynamics in continuous stirred tank aerosol reactors and flow aerosol reactors are provided. For the application to flow aerosol reactors, the discussion is developed in terms of considerations for merging a MAD model with the SIMPLER routine described by Patankar (1980). Considerations for incorporating a MAD model into the U.S. Environmental Protection Agency's Regional Particulate Model are also described. Numerical and analytical techniques for evaluating the size-space integrals of the modal dynamics equations (MDEs) are described. For multimodal logonormal distributions, an analytical expression for the coagulation integrals of the MDEs, applicable for all size regimes, is derived, and is within 20% of accurate numerical evaluation of the same moment coagulation integrals. A computationally efficient integration technique, based on Gauss-Hermite numerical integration, is also derived.
Hamiltonian Dynamics of Preferential Attachment
Zuev, Konstantin; Krioukov, Dmitri
2015-01-01T23:59:59.000Z
Prediction and control of network dynamics are grand-challenge problems in network science. The lack of understanding of fundamental laws driving the dynamics of networks is among the reasons why many practical problems of great significance remain unsolved for decades. Here we study the dynamics of networks evolving according to preferential attachment, known to approximate well the large-scale growth dynamics of a variety of real networks. We show that this dynamics is Hamiltonian, thus casting the study of complex networks dynamics to the powerful canonical formalism, in which the time evolution of a dynamical system is described by Hamilton's equations. We derive the explicit form of the Hamiltonian that governs network growth in preferential attachment. This Hamiltonian turns out to be nearly identical to graph energy in the configuration model, which shows that the ensemble of random graphs generated by preferential attachment is nearly identical to the ensemble of random graphs with scale-free degree d...
Symmetries in open quantum dynamics
Thomas F. Jordan
2014-08-20T23:59:59.000Z
Simple examples are used to introduce and examine a Heisenberg picture of symmetries of open quantum dynamics that can be described by unitary operators. When the symmetries are for Hamiltonian dynamics of an entire system, and the spectrum of the Hamiltonian operator has a lower bound, the symmetry operators commute with the Hamiltonian operator. An example shows that symmetry operators need not commute with the Hamiltonian operator when the spectrum of the Hamiltonian does not have a lower bound. There are many more symmetries that are only for the open dynamics of a subsystem and are described by unitary operators that do not commute with the Hamiltonian for the dynamics of the entire system. Examples show how these symmetries alone can reveal properties of the dynamics and reduce what needs to be done to work out the dynamics. A symmetry of the open dynamics of a subsystem can imply properties of the dynamics for the entire system that are not implied by the symmetries of the dynamics of the entire system. The symmetries are generally not related to constants of the motion for the open dynamics of the subsystem. There are symmetries of the open dynamics of a subsystem that depend only on the dynamics. In the simplest examples, these are also symmetries of the dynamics of the entire system. There are many more symmetries, of a new kind, that also depend on correlations, or absence of correlations, between the subsystem and the rest of the entire system, or on the state of the rest of the entire system. Symmetries that depend on correlations generally cannot be seen in the Schr\\"{o}dinger picture as symmetries of dynamical maps of density matrices for the subsystem.
SDI: Statistical dynamic interactions
Blann, M.; Mustafa, M.G. (Lawrence Livermore National Lab., CA (USA)); Peilert, G.; Stoecker, H.; Greiner, W. (Frankfurt Univ. (Germany, F.R.). Inst. fuer Theoretische Physik)
1991-04-01T23:59:59.000Z
We focus on the combined statistical and dynamical aspects of heavy ion induced reactions. The overall picture is illustrated by considering the reaction {sup 36}Ar + {sup 238}U at a projectile energy of 35 MeV/nucleon. We illustrate the time dependent bound excitation energy due to the fusion/relaxation dynamics as calculated with the Boltzmann master equation. An estimate of the mass, charge and excitation of an equilibrated nucleus surviving the fast (dynamic) fusion-relaxation process is used as input into an evaporation calculation which includes 20 heavy fragment exit channels. The distribution of excitations between residue and clusters is explicitly calculated, as is the further deexcitation of clusters to bound nuclei. These results are compared with the exclusive cluster multiplicity measurements of Kim et al., and are found to give excellent agreement. We consider also an equilibrated residue system at 25% lower initial excitation, which gives an unsatisfactory exclusive multiplicity distribution. This illustrates that exclusive fragment multiplicity may provide a thermometer for system excitation. This analysis of data involves successive binary decay with no compressional effects nor phase transitions. Several examples of primary versus final (stable) cluster decay probabilities for an A = 100 nucleus at excitations of 100 to 800 MeV are presented. From these results a large change in multifragmentation patterns may be understood as a simple phase space consequence, invoking neither phase transitions, nor equation of state information. These results are used to illustrate physical quantities which are ambiguous to deduce from experimental fragment measurements. 14 refs., 4 figs.
Bachas, Constantin [Laboratoire de Physique Theorique de l'Ecole Normale Superieure, 24 rue Lhomond, 75231 Paris cedex (France); Bunster, Claudio [Centro de Estudios Cientificos (CECS), Avenida Arturo Prat 514, Valdivia (Chile); Henneaux, Marc [Physique Theorique et Mathematique, Universite Libre de Bruxelles and International Solvay Institutes, ULB Campus Plaine C.P. 231, 1050 Bruxelles (Belgium); Centro de Estudios Cientificos (CECS), Avenida Arturo Prat 514, Valdivia (Chile)
2009-08-28T23:59:59.000Z
In three spacetime dimensions the world volume of a magnetic source is a single point, an event. We make the event dynamical by regarding it as the imprint of a flux-carrying particle impinging from an extra dimension. This can be generalized to higher spacetime dimensions and to extended events. We exhibit universal observable consequences of the existence of events and argue that events are as important as particles or branes. We explain how events arise on the world volume of membranes in M theory, and in a Josephson junction in superconductivity.
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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadapInactiveVisitingContract ManagementDiscovering HowAnaDynamic Switching of the Spin
Coarse Grained Quantum Dynamics
Cesar Agon; Vijay Balasubramanian; Skyler Kasko; Albion Lawrence
2014-12-09T23:59:59.000Z
We consider coarse graining a quantum system divided between short distance and long distance degrees of freedom, which are coupled by the Hamiltonian. Observations using purely long distance observables can be described by the reduced density matrix that arises from tracing out the short-distance observables. The dynamics of this density matrix is that of an open quantum system, and is nonlocal in time, on the order of some short time scale. We describe these dynamics in a model system with a simple hierarchy of energy gaps $\\Delta E_{UV} > \\Delta E_{IR}$, in which the coupling between high-and low-energy degrees of freedom is treated to second order in perturbation theory. We then describe the equations of motion under suitable time averaging, reflecting the limited time resolution of actual experiments, and find an expansion of the master equation in powers of $\\Delta E_{IR}/\\Delta E_{UV}$, in which the failure of the system to be Hamiltonian or even Markovian appears at higher orders in this ratio. We compute the evolution of the density matrix in two specific examples -- coupled spins, and linearly coupled simple harmonic oscillators. Finally, we discuss the evolution of the density matrix using the path integral approach, computing the Feynman-Vernon influence functional for the IR degrees of freedom in perturbation theory, and argue that this influence functional is the correct analog of the Wilsonian effective action for this problem.
Cosmological dynamical systems
Genly Leon; Carlos R. Fadragas
2014-12-18T23:59:59.000Z
In this book are studied, from the perspective of the dynamical systems, several Universe models. In chapter 1 we give a bird's eye view on cosmology and cosmological problems. Chapter 2 is devoted to a brief review on some results and useful tools from the qualitative theory of dynamical systems. They provide the theoretical basis for the qualitative study of concrete cosmological models. Chapters 1 and 2 are a review of well-known results. Chapters 3, 4, 5 and 6 are devoted to our main results. In these chapters are extended and settled in a substantially different, more strict mathematical language, several results obtained by one of us in arXiv:0812.1013 [gr-qc]; arXiv:1009.0689 [gr-qc]; arXiv:0904.1577[gr-qc]; and arXiv:0909.3571 [hep-th]. In chapter 6, we provide a different approach to the subject discussed in astro-ph/0503478. Additionally, we perform a Poincar\\'e compactification process allowing to construct a global phase space containing all the cosmological information in both finite and infinite regions for all the models.
A. Jadczyk
1994-06-30T23:59:59.000Z
The paper consists of two parts. In the first part Schroedinger's equation for a charged quantum particle in a Galilei-Newton curved space-time is derived in a fully geometrical way. Gravitational and electromagnetic fields are coded into space metric and space-time connection. The fundamental geometrical object is a quantum connection in a Hermitian line bundle over the 7-dimensional jet space of 3-velocities. The secondary object is the bundle of Hilbert spaces over absolute time. Time appears as a superselection quantity while Shroedinger equation is interpreted as parallel transport in this bundle. In the second part the problem of measurement in quantum theory is discussed as a part of a more general problem of coupling between quantum and classical systems. The standard framework of quantum theory is extended so as to allow for dynamical central observables within dissipative dynamics. It is shown that within this approach one obtains not only Liouville equation that describes statistical ensembles, but also a piecewise-deterministic random process describing sequences of "events" that can be monitored by a continuous observation of the single, coupled classical system. It also describes "quantum jumps" or "wave packet reductions" that accompany these events. Two example are worked out in some details. The last one deals with the problem oof "how to determine the wave function ?".
Tonev, D. [Institute for Nuclear Research and Nuclear Energy, BAS, 1784 Sofia (Bulgaria); INFN, Laboratori Nazionali di Legnaro, 35020 Legnaro (Italy); Angelis, G. de [INFN, Laboratori Nazionali di Legnaro, 35020 Legnaro (Italy); Brant, S. [Department of Physics, Faculty of Science, University of Zagreb, 10000 Zagreb (Croatia); Petkov, P. [Institute for Nuclear Research and Nuclear Energy, BAS, 1784 Sofia (Bulgaria); Ventura, A. [ENEA, 40129 Bologna and INFN, Sezione di Bologna (Italy)
2009-08-26T23:59:59.000Z
The possible chiral interpretation of twin bands in odd-odd nuclei was investigated in the Interacting Boson Fermion-Fermion Model. The analysis of the wave functions has shown that the possibility for angular momenta of the valence proton, neutron and core to find themselves in the favorable, almost orthogonal geometry is present, but not dominant. Such behaviour is found to be similar in nuclei where both the level energies and the electromagnetic decay properties display the chiral pattern, as well as in those where only the energies of the corresponding levels in the twin bands are close together. The difference in the structure of the two types of chiral candidates nuclei can be attributed to different beta and gamma fluctuations, induced by the exchange boson-fermion interaction of the Interacting Boson Fermion-Fermion Model. In both cases the chirality is weak and dynamic. The existence of doublets of bands in {sup 134}Pr can be attributed to dynamic chirality dominated by shape fluctuations.
Nuclear Matter and Nuclear Dynamics
M Colonna
2009-02-26T23:59:59.000Z
Highlights on the recent research activity, carried out by the Italian Community involved in the "Nuclear Matter and Nuclear Dynamics" field, will be presented.
Particle Dynamics And Emergent Gravity
Amir H. Fatollahi
2008-05-08T23:59:59.000Z
The emergent gravity proposal is examined within the framework of noncommutative QED/gravity correspondence from particle dynamics point of view.
Three-nucleon interactions: dynamics
M. R. Robilotta
2008-03-04T23:59:59.000Z
A discussion is presented of the dynamics underlying three-body nuclear forces, with emphasis on changes which occurred over several decades.
Los Alamos Dynamics Summer School
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
School The Sixteenth Los Alamos Dynamics Summer School Program Information and Application Process Contact Institute Director Charles Farrar (505) 663-5330 Email Professional Staff...
LANL | Physics | Dynamic Plutonium Experiments
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Dynamic plutonium experiments Since the end of nuclear testing the nation has had to rely on sophisticated computer models to ensure the safety and reliability of the nuclear...
Dynamical Transition and Heterogeneous Hydration Dynamics in RNA
Jeseong Yoon; Jong-Chin Lin; Changbong Hyeon; D. Thirumalai
2014-04-24T23:59:59.000Z
Enhanced dynamical fluctuations of RNAs, facilitated by a network of water molecules with strong interactions with RNA, are suspected to be critical in their ability to respond to a variety of cellular signals. Using atomically detailed molecular dynamics simulations at various temperatures of purine (adenine)- and preQ$_1$ sensing riboswitch aptamers, we show that water molecules in the vicinity of RNAs undergo complex dynamics depending on the local structures of the RNAs. The overall lifetimes of hydrogen bonds (HBs) of surface bound waters are more than at least 1-2 orders of magnitude longer than bulk water. Slow hydration dynamics, revealed in non-Arrhenius behavior of the relaxation time, arises from high activation barriers to break water hydrogen bonds with a nucleotide and by reduced diffusion of water. The relaxation kinetics at specific locations in the two RNAs show a broad spectrum of time scales reminiscent of glass-like behavior, suggesting that the hydration dynamics is highly heterogeneous. Both RNAs undergo dynamic transition at $T = T_D \\gtrsim 200$ K as assessed by the mean square fluctuation of hydrogen atoms $\\langle x^2\\rangle$, which undergoes an abrupt harmonic-to-anharmonic transition at $T_D$. The near universal value of $T_D$ found for these RNAs and previously for tRNA is strongly correlated with changes in hydration dynamics as $T$ is altered. Hierarchical dynamics of waters associated with the RNA surface, revealed in the motions of distinct classes of water with well-separated time scales, reflects the heterogeneous local environment on the molecular surface of RNA. At low temperatures slow water dynamics predominates over structural transitions. Our study demonstrates that the complex interplay of dynamics between water and local environment in the RNA structures could be a key determinant of the functional activities of RNA.
Probing Single-Molecule Protein Conformational Dynamics. | EMSL
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Single-Molecule Protein Conformational Dynamics. Probing Single-Molecule Protein Conformational Dynamics. Abstract: Protein conformational fluctuations and dynamics, often...
Hamiltonian Dynamics of Preferential Attachment
Konstantin Zuev; Fragkiskos Papadopoulos; Dmitri Krioukov
2015-04-29T23:59:59.000Z
Prediction and control of network dynamics are grand-challenge problems in network science. The lack of understanding of fundamental laws driving the dynamics of networks is among the reasons why many practical problems of great significance remain unsolved for decades. Here we study the dynamics of networks evolving according to preferential attachment, known to approximate well the large-scale growth dynamics of a variety of real networks. We show that this dynamics is Hamiltonian, thus casting the study of complex networks dynamics to the powerful canonical formalism, in which the time evolution of a dynamical system is described by Hamilton's equations. We derive the explicit form of the Hamiltonian that governs network growth in preferential attachment. This Hamiltonian turns out to be nearly identical to graph energy in the configuration model, which shows that the ensemble of random graphs generated by preferential attachment is nearly identical to the ensemble of random graphs with scale-free degree distributions. In other words, preferential attachment generates nothing but random graphs with power-law degree distribution. The extension of the developed canonical formalism for network analysis to richer geometric network models with non-degenerate groups of symmetries may eventually lead to a system of equations describing network dynamics at small scales.
Perturbation Theory for Population Dynamics
Francisco M. Fernandez
2007-12-20T23:59:59.000Z
We prove that a recently proposed homotopy perturbation method for the treatment of population dynamics is just the Taylor expansion of the population variables about initial time. Our results show that this perturbation method fails to provide the global features of the ecosystem dynamics.
Effective equations for quantum dynamics
Benjamin Schlein
2012-08-01T23:59:59.000Z
We report on recent results concerning the derivation of effective evolution equations starting from many body quantum dynamics. In particular, we obtain rigorous derivations of nonlinear Hartree equations in the bosonic mean field limit, with precise bounds on the rate of convergence. Moreover, we present a central limit theorem for the fluctuations around the Hartree dynamics.
Status of dynamical ensemble generation
Chulwoo Jung
2010-01-06T23:59:59.000Z
I give an overview of current and future plans of dynamical QCD ensemble generation activities. A comparison of simulation cost between different discretizations is made. Recent developments in techniques and algorithms used in QCD dynamical simulations, especially mass reweighting, are also discussed.
Hierarchical Adaptive Dynamic Power Management
Chen, Yuanzhu Peter
Hierarchical Adaptive Dynamic Power Management Zhiyuan Ren, Member, IEEE, Bruce H. Krogh, Fellow, IEEE, and Radu Marculescu, Member, IEEE Abstract--Dynamic power management aims at extending battery management strategies can lead to poor performance or unnecessary power consumption when there are wide
Environment-induced dynamical chaos
Bidhan Chandra Bag; Deb Shankar Ray
2000-05-18T23:59:59.000Z
We examine the interplay of nonlinearity of a dynamical system and thermal fluctuation of its environment in the ``physical limit'' of small damping and slow diffusion in a semiclassical context and show that the trajectories of c-number variables exhibit dynamical chaos due to the thermal fluctuations of the bath.
FPGA ACCELERATION OF MOLECULAR DYNAMICS SIMULATIONS
Herbordt, Martin
' & $ % FPGA ACCELERATION OF MOLECULAR DYNAMICS SIMULATIONS YONGFENG GU Dissertation submitted;BOSTON UNIVERSITY COLLEGE OF ENGINEERING Dissertation FPGA ACCELERATION OF MOLECULAR DYNAMICS SIMULATIONS DYNAMICS SIMULATIONS (Order No. ) YONGFENG GU Boston University, College of Engineering, 2008 Major
Characterization of majorization monotone quantum dynamics
Haidong Yuan
2015-03-25T23:59:59.000Z
In this article I study the dynamics of open quantum system in Markovian environment. I give necessary and sufficient conditions for such dynamics to be majorization monotone, which are those dynamics always mixing the states.
Reptational dynamics in dissipative particle dynamics simulations of polymer melts
P. Nikunen; I. Vattulainen; M. Karttunen
2005-12-12T23:59:59.000Z
Understanding the complex viscoelastic properties of polymeric liquids remains a challenge in materials science and soft matter physics. Here, we present a simple and computationally efficient criterion for the topological constraints in polymeric liquids using the Dissipative Particle Dynamics (DPD). The same approach is also applicable in other soft potential models. For short chains the model correctly reproduces Rouse-like dynamics whereas for longer chains the dynamics becomes reptational as the chain length is increased - something that is not attainable using standard DPD or other coarse-grained soft potential methods. Importantly, no new length scales or forces need to be added.
Protein Dynamics Hit the Big Screen
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Protein Dynamics Hit the Big Screen Protein Dynamics Hit the Big Screen Now playing at a supercomputer near you: proteins in action June 29, 2005 Contact: Dan Krotz,...
Laser Driven Dynamic Loading of Condensed Matter
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Laser Driven Dynamic Loading of Condensed Matter Laser Driven Dynamic Loading of Condensed Matter Advanced diagnostics of experiments covering many orders of magnitude in strain...
Structure, Charge Distribution, and Electron Hopping Dynamics...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Charge Distribution, and Electron Hopping Dynamics in Magnetite (Fe3O4) (100) Surfaces from First Principles. Structure, Charge Distribution, and Electron Hopping Dynamics in...
Los Alamos Dynamics Summer School Projects
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
School-Overview Los Alamos Dynamics Summer School Projects Los Alamos Dynamics Summer School Projects and Resources Contact Institute Director Charles Farrar (505) 663-5330 Email...
Dynamic stall on wind turbine blades
Butterfield, C.P.; Simms, D.; Scott, G. [National Renewable Energy Lab., Golden, CO (United States)] [National Renewable Energy Lab., Golden, CO (United States); Hansen, A.C. [Utah Univ., Salt Lake City, UT (United States)] [Utah Univ., Salt Lake City, UT (United States)
1991-12-01T23:59:59.000Z
Dynamic loads must be predicted accurately in order to estimate the fatigue life of wind turbines operating in turbulent environments. Dynamic stall contributes to increased dynamic loads during normal operation of all types of horizontal-axis wind turbine (HAWTs). This report illustrates how dynamic stall varies throughout the blade span of a 10 m HAWT during yawed and unyawed operating conditions. Lift, drag, and pitching moment coefficients during dynamics stall are discussed. Resulting dynamic loads are presented, and the effects of dynamic stall on yaw loads are demonstrated using a yaw loads dynamic analysis (YAWDYN). 12 refs., 22 figs., 1 tab.
Peraire, Jaume
Dynamics starts with fundamentals of Newtonian mechanics. Further topics include kinematics, particle dynamics, motion relative to accelerated reference frames, work and energy, impulse and momentum, systems of particles ...
Development of a Dynamic DOE Calibration Model
Broader source: Energy.gov (indexed) [DOE]
cell characterization * Train and validate dynamic models * Apply models for system optimization Results * Dynamic emissions models have been developed (validation error on the...
Fermionic Molecular Dynamics for nuclear dynamics and thermodynamics
K. H. O. Hasnaoui; Ph. Chomaz; F. Gulminelli
2008-12-02T23:59:59.000Z
A new Fermionic Molecular Dynamics (FMD) model based on a Skyrme functional is proposed in this paper. After introducing the basic formalism, some first applications to nuclear structure and nuclear thermodynamics are presented
Collective dynamics in sparse networks
Stefano Luccioli; Simona Olmi; Antonio Politi; Alessandro Torcini
2012-08-03T23:59:59.000Z
The microscopic and macroscopic dynamics of random networks is investigated in the strong-dilution limit (i.e. for sparse networks). By simulating chaotic maps, Stuart-Landau oscillators, and leaky integrate-and-fire neurons, we show that a finite connectivity (of the order of a few tens) is able to sustain a nontrivial collective dynamics even in the thermodynamic limit. Although the network structure implies a non-additive dynamics, the microscopic evolution is extensive (i.e. the number of active degrees of freedom is proportional to the number of network elements).
Dynamics of generalized tachyon field
Rong-Jia Yang; Jingzhao Qi
2012-08-06T23:59:59.000Z
We investigate the dynamics of generalized tachyon field in FRW spacetime. We obtain the autonomous dynamical system for the general case. Because the general autonomous dynamical system cannot be solved analytically, we discuss two cases in detail: $\\beta=1$ and $\\beta=2$. We find the critical points and study their stability. At these critical points, we also consider the stability of the generalized tachyon field, which is as important as the stability of critical points. The possible final states of the universe are discussed.
Chromospheric Dynamics and Line Formation
R. Hammer; P. Ulmschneider
2007-07-14T23:59:59.000Z
The solar chromosphere is very dynamic, due to the presence of large amplitude hydrodynamic waves. Their propagation is affected by NLTE radiative transport in strong spectral lines, which can in turn be used to diagnose the dynamics of the chromosphere. We give a basic introduction into the equations of NLTE radiation hydrodynamics and describe how they are solved in current numerical simulations. The comparison with observation shows that one-dimensional codes can describe strong brightenings quite well, but the overall chromospheric dynamics appears to be governed by three-dimensional shock propagation.
Dynamic simulation of voltage collapses
Deuse, J.; Stubbe, M. (Tractebel, Brussels (Belgium))
1993-08-01T23:59:59.000Z
Most of the time the voltage collapse phenomena are studied by means of computer programs designed for the calculation of steady state conditions. But in the real world, the simultaneous occurrences of losses of synchronism, of AVR dynamics or of transformer tap changes call for a full dynamic simulation of voltage phenomena. The present paper shows some examples of dynamic simulations of voltage phenomena using a new general purpose stability program (EUROSTAG), covering in a continuous way the classical fields of transient, mid-term and long-term stability, and also the quasi steady state conditions of a power system.
Connecting curves for dynamical systems
R. Gilmore; Jean-Marc Ginoux; Timothy Jones; C. Letellier; U. S. Freitas
2010-03-08T23:59:59.000Z
We introduce one dimensional sets to help describe and constrain the integral curves of an $n$ dimensional dynamical system. These curves provide more information about the system than the zero-dimensional sets (fixed points) do. In fact, these curves pass through the fixed points. Connecting curves are introduced using two different but equivalent definitions, one from dynamical systems theory, the other from differential geometry. We describe how to compute these curves and illustrate their properties by showing the connecting curves for a number of dynamical systems.
Fractal dynamics of earthquakes
Bak, P.; Chen, K. [Brookhaven National Lab., Upton, NY (United States). Dept. of Physics
1995-05-01T23:59:59.000Z
Many objects in nature, from mountain landscapes to electrical breakdown and turbulence, have a self-similar fractal spatial structure. It seems obvious that to understand the origin of self-similar structures, one must understand the nature of the dynamical processes that created them: temporal and spatial properties must necessarily be completely interwoven. This is particularly true for earthquakes, which have a variety of fractal aspects. The distribution of energy released during earthquakes is given by the Gutenberg-Richter power law. The distribution of epicenters appears to be fractal with dimension D {approx} 1--1.3. The number of after shocks decay as a function of time according to the Omori power law. There have been several attempts to explain the Gutenberg-Richter law by starting from a fractal distribution of faults or stresses. But this is a hen-and-egg approach: to explain the Gutenberg-Richter law, one assumes the existence of another power-law--the fractal distribution. The authors present results of a simple stick slip model of earthquakes, which evolves to a self-organized critical state. Emphasis is on demonstrating that empirical power laws for earthquakes indicate that the Earth`s crust is at the critical state, with no typical time, space, or energy scale. Of course the model is tremendously oversimplified; however in analogy with equilibrium phenomena they do not expect criticality to depend on details of the model (universality).
Sheldon Goldstein; Ward Struyve
2014-11-05T23:59:59.000Z
Non-relativistic de Broglie-Bohm theory describes particles moving under the guidance of the wave function. In de Broglie's original formulation, the particle dynamics is given by a first-order differential equation. In Bohm's reformulation, it is given by Newton's law of motion with an extra potential that depends on the wave function--the quantum potential--together with a constraint on the possible velocities. It was recently argued, mainly by numerical simulations, that relaxing this velocity constraint leads to a physically untenable theory. We provide further evidence for this by showing that for various wave functions the particles tend to escape the wave packet. In particular, we show that for a central classical potential and bound energy eigenstates the particle motion is often unbounded. This work seems particularly relevant for ways of simulating wave function evolution based on Bohm's formulation of the de Broglie-Bohm theory. Namely, the simulations may become unstable due to deviations from the velocity constraint.
Computational fluid dynamic applications
Chang, S.-L.; Lottes, S. A.; Zhou, C. Q.
2000-04-03T23:59:59.000Z
The rapid advancement of computational capability including speed and memory size has prompted the wide use of computational fluid dynamics (CFD) codes to simulate complex flow systems. CFD simulations are used to study the operating problems encountered in system, to evaluate the impacts of operation/design parameters on the performance of a system, and to investigate novel design concepts. CFD codes are generally developed based on the conservation laws of mass, momentum, and energy that govern the characteristics of a flow. The governing equations are simplified and discretized for a selected computational grid system. Numerical methods are selected to simplify and calculate approximate flow properties. For turbulent, reacting, and multiphase flow systems the complex processes relating to these aspects of the flow, i.e., turbulent diffusion, combustion kinetics, interfacial drag and heat and mass transfer, etc., are described in mathematical models, based on a combination of fundamental physics and empirical data, that are incorporated into the code. CFD simulation has been applied to a large variety of practical and industrial scale flow systems.
Dynamics of neural cryptography
Ruttor, Andreas; Kinzel, Wolfgang; Kanter, Ido [Institut fuer Theoretische Physik, Universitaet Wuerzburg, Am Hubland, 97074 Wuerzburg (Germany); Minerva Center and Department of Physics, Bar Ilan University, Ramat Gan 52900 (Israel)
2007-05-15T23:59:59.000Z
Synchronization of neural networks has been used for public channel protocols in cryptography. In the case of tree parity machines the dynamics of both bidirectional synchronization and unidirectional learning is driven by attractive and repulsive stochastic forces. Thus it can be described well by a random walk model for the overlap between participating neural networks. For that purpose transition probabilities and scaling laws for the step sizes are derived analytically. Both these calculations as well as numerical simulations show that bidirectional interaction leads to full synchronization on average. In contrast, successful learning is only possible by means of fluctuations. Consequently, synchronization is much faster than learning, which is essential for the security of the neural key-exchange protocol. However, this qualitative difference between bidirectional and unidirectional interaction vanishes if tree parity machines with more than three hidden units are used, so that those neural networks are not suitable for neural cryptography. In addition, the effective number of keys which can be generated by the neural key-exchange protocol is calculated using the entropy of the weight distribution. As this quantity increases exponentially with the system size, brute-force attacks on neural cryptography can easily be made unfeasible.
Ben-Zvi I.; Kuczewski A.; Altinbas, Z.; Beavis, D.; Belomestnykh,; Dai, J. et al
2012-07-01T23:59:59.000Z
The Collider-Accelerator Department at Brookhaven National Laboratory is building a high-brightness 500 mA capable Energy Recovery Linac (ERL) as one of its main R&D thrusts towards eRHIC, the polarized electron - hadron collider as an upgrade of the operating RHIC facility. The ERL is in final assembly stages, with injection commisioning starting in October 2012. The objective of this ERL is to serve as a platform for R&D into high current ERL, in particular issues of halo generation and control, Higher-Order Mode (HOM) issues, coherent emissions for the beam and high-brightness, high-power beam generation and preservation. The R&D ERL features a superconducting laser-photocathode RF gun with a high quantum efficiency photoccathode served with a load-lock cathode delivery system, a highly damped 5-cell accelerating cavity, a highly flexible single-pass loop and a comprehensive system of beam instrumentation. In this ICFA Beam Dynamics Newsletter article we will describe the ERL in a degree of detail that is not usually found in regular publications. We will discuss the various systems of the ERL, following the electrons from the photocathode to the beam dump, cover the control system, machine protection etc and summarize with the status of the ERL systems.
Scalability of dynamic traffic assignment
Wen, Yang, Ph. D. Massachusetts Institute of Technology
2009-01-01T23:59:59.000Z
This research develops a systematic approach to analyze the computational performance of Dynamic Traffic Assignment (DTA) models and provides solution techniques to improve their scalability for on-line applications for ...
Queuing models System dynamics models
Glushko, Robert J.
models Value chain models Business Model / Organizational Perspective Process Perspective Information#12;#12;#12;#12;Queuing models System dynamics models #12;#12;#12;#12;Blueprint or touchpoint
THz Dynamic Nuclear Polarization NMR
Nanni, Emilio Alessandro
Dynamic nuclear polarization (DNP) increases the sensitivity of nuclear magnetic resonance (NMR) spectroscopy by using high frequency microwaves to transfer the polarization of the electrons to the nuclear spins. The ...
Weston, R.E. Jr.; Sears, T.J.; Preses, J.M. [Brookhaven National Laboratory, Upton, NY (United States)
1993-12-01T23:59:59.000Z
Research in this program is directed towards the spectroscopy of small free radicals and reactive molecules and the state-to-state dynamics of gas phase collision, energy transfer, and photodissociation phenomena. Work on several systems is summarized here.
Faruqui, Ahmad; Hledik, Ryan; Tsoukalis, John
2009-04-15T23:59:59.000Z
Using data from a generic California utility, it can be shown that it is feasible to develop dynamic pricing rates for all customer classes. These rates have the potential to reduce system peak demands from 1 to 9 percent. (author)
Qubit dynamics under alternating controls
Aiello, Clarice Demarchi
2014-01-01T23:59:59.000Z
In this thesis, we discuss two problems of quantum dynamics in the presence of alternating controls. Alternating controls arise in many protocols designed to extend the duration over which a qubit is a useful computational ...
Dynamic Unawareness and Rationalizable Behavior
Niebur, Ernst
Dynamic Unawareness and Rationalizable Behavior Aviad Heifetz Martin Meier Burkhard C. Schipper 2007, LOFT 2008, Games 2008 and NSF/NBER/CEME 2009, and UECE Lisbon 2010. Aviad is grateful
Nuclear dynamics induced by antiprotons
Zhao-Qing Feng
2015-05-20T23:59:59.000Z
Reaction dynamics in collisions of antiprotons on nuclei is investigated within the Lanzhou quantum molecular dynamics model. The reaction channels of elastic scattering, annihilation, charge exchange and inelastic collisions of antiprotons on nucleons have been included in the model. Dynamics on particle production, in particular pions, kaons, antikaons and hyperons, is investigated in collisions of $\\overline{p}$ on $^{12}$C, $^{20}$Ne, $^{40}$Ca and $^{181}$Ta from a low to high incident momenta. It is found that the annihilations of $\\overline{p}$ on nucleons are of importance on the dynamics of particle production in phase space. Hyperons are mainly produced via meson induced reactions on nucleons and strangeness exchange collisions, which lead to the delayed emission in antiproton-nucleus collisions.
Actin Dynamics in Aspergillus nidulans
Quintanilla, Laura
2013-04-08T23:59:59.000Z
Actin is a major cytoskeletal protein required for the polarized growth of filamentous fungi. Recent studies have characterized the dynamics of actin polymers in growing Neurospora crassa and identified the presence of actin patches, cables...
Tactic behaviors in bacterial dynamics
Sekora, Michael David
2005-01-01T23:59:59.000Z
The locomotion of a wide class of motile bacteria can be mathematically described as a biased random walk in three-dimensional space. Fluid mechanics and probability theory are invoked to model the dynamics of bacteria ...
Rotational dynamics of entangled polymers
Jean-Charles Walter; Michiel Laleman; Marco Baiesi; Enrico Carlon
2014-09-01T23:59:59.000Z
Some recent results on the rotational dynamics of polymers are reviewed and extended. We focus here on the relaxation of a polymer, either flexible or semiflexible, initially wrapped around a rigid rod. We also study the steady polymer rotation generated by a constant torque on the rod. The interplay of frictional and entropic forces leads to a complex dynamical behavior characterized by non-trivial universal exponents. The results are based on extensive simulations of polymers undergoing Rouse dynamics and on an analytical approach using force balance and scaling arguments. The analytical results are in general in good agreement with the simulations, showing how a simplified approach can correctly capture the complex dynamical behavior of rotating polymers.
Nonlinear Dynamics of Dry Friction
Franz-Josef Elmer
1997-07-01T23:59:59.000Z
The dynamical behavior caused by dry friction is studied for a spring-block system pulled with constant velocity over a surface. The dynamical consequences of a general type of phenomenological friction law (stick-time dependent static friction, velocity dependent kinetic friction) are investigated. Three types of motion are possible: Stick-slip motion, continuous sliding, and oscillations without sticking events. A rather complete discussion of local and global bifurcation scenarios of these attractors and their unstable counterparts is present.
Dynamic Tides in Close Binaries
B. Willems
2005-11-10T23:59:59.000Z
The basic theory of dynamic tides in close binaries is reviewed. Particular attention is paid to resonances between dynamic tides and free oscillation modes and to the role of the apsidal-motion rate in probing the internal structure of binary components. The discussed effects are generally applicable to stars across the entire Hertzsprung-Russell diagram, including the binary OB-stars discussed at this meeting.
Dynamic response of monolithic and laminate/particulate reactive mixtures
Wei, Chung-Ting
2011-01-01T23:59:59.000Z
from high speed cinematography of dynamic compressionfrom high speed cinematography of dynamic compression
DYNAMIC MANAGEMENT OF POWER CONSUMPTION Tajana Simunic
Simunic, Tajana
Chapter 1 DYNAMIC MANAGEMENT OF POWER CONSUMPTION Tajana Simunic HP Labs Abstract Power consumption by adapting to changes in environment are proposed: dynamic power management and dynamic voltage scaling. Dynamic power management (DPM) algorithms aim to reduce the power consumption at the system level
Nonlinear Dynamics of Longitudinal Ground Vehicle Traction
Shaw, Steven W.
asphalt b) Wet asphalt c) Gravel d) Packed Snow Nonlinear Dynamics of Longitudinal Ground Vehicle Traction
Game dynamics and Nash equilibria Yannick Viossat
Paris-Sud XI, Université de
Game dynamics and Nash equilibria Yannick Viossat CEREMADE, Universit´e Paris-Dauphine Abstract in the support of this equilibrium are eliminated by the replicator dynamics and the best- reply dynamics. MSC classification. Primary: 91A22 ; Secondary: 34A34, 34A60. Keywords: Nash equilibrium, replicator dynamics, best
Event-driven multithreaded dynamic optimization
Zhang, Weifeng
2006-01-01T23:59:59.000Z
Speci?c Optimizations . . . . . . . . . . . . . F.3. Trace Optimization Overhead . . . . . . . . . . . . . . .Dynamic Optimization . . . . . . .B. Optimizations with the
METR 4133, Atmospheric Dynamics III: Mid-Latitude Synoptic-Scale Dynamics
Droegemeier, Kelvin K.
METR 4133, Atmospheric Dynamics III: Mid-Latitude Synoptic- Scale Dynamics Fall 2012 Instructor Dr and Thurs, 11:30 am 12:45 pm Required Texts Bluestein, H., 1992: Synoptic-Dynamic Meteorology in Mid-Latitudes, Volume I: Principles of Kinematics and Dynamics. Oxford Univ. Press, 431pp. Bluestein, H., 1993: Synoptic-Dynamic
Simple Dynamic Gasifier Model That Runs in Aspen Dynamics
Robinson, P.J.; Luyben, W.L. [Lehigh University, Bethlehem, PA (United States). Dept. of Chemical Engineering
2008-10-15T23:59:59.000Z
Gasification (or partial oxidation) is a vital component of 'clean coal' technology. Sulfur and nitrogen emissions can be reduced, overall energy efficiency is increased, and carbon dioxide recovery and sequestration are facilitated. Gasification units in an electric power generation plant produce a fuel for driving combustion turbines. Gasification units in a chemical plant generate gas, which can be used to produce a wide spectrum of chemical products. Future plants are predicted to be hybrid power/chemical plants with gasification as the key unit operation. The widely used process simulator Aspen Plus provides a library of models that can be used to develop an overall gasifier model that handles solids. So steady-state design and optimization studies of processes with gasifiers can be undertaken. This paper presents a simple approximate method for achieving the objective of having a gasifier model that can be exported into Aspen Dynamics. The basic idea is to use a high molecular weight hydrocarbon that is present in the Aspen library as a pseudofuel. This component should have the same 1:1 hydrogen-to-carbon ratio that is found in coal and biomass. For many plantwide dynamic studies, a rigorous high-fidelity dynamic model of the gasifier is not needed because its dynamics are very fast and the gasifier gas volume is a relatively small fraction of the total volume of the entire plant. The proposed approximate model captures the essential macroscale thermal, flow, composition, and pressure dynamics. This paper does not attempt to optimize the design or control of gasifiers but merely presents an idea of how to dynamically simulate coal gasification in an approximate way.
Thomas D. Kühne
2013-03-26T23:59:59.000Z
Computer simulation methods, such as Monte Carlo or Molecular Dynamics, are very powerful computational techniques that provide detailed and essentially exact information on classical many-body problems. With the advent of ab-initio molecular dynamics, where the forces are computed on-the-fly by accurate electronic structure calculations, the scope of either method has been greatly extended. This new approach, which unifies Newton's and Schr\\"odinger's equations, allows for complex simulations without relying on any adjustable parameter. This review is intended to outline the basic principles as well as a survey of the field. Beginning with the derivation of Born-Oppenheimer molecular dynamics, the Car-Parrinello method and the recently devised efficient and accurate Car-Parrinello-like approach to Born-Oppenheimer molecular dynamics, which unifies best of both schemes are discussed. The predictive power of this novel second-generation Car-Parrinello approach is demonstrated by a series of applications ranging from liquid metals, to semiconductors and water. This development allows for ab-initio molecular dynamics simulations on much larger length and time scales than previously thought feasible.
The Dynamics of Quintessence, The Quintessence of Dynamics
Eric V. Linder
2007-06-13T23:59:59.000Z
Quintessence theories for cosmic acceleration imbue dark energy with a non-trivial dynamics that offers hope in distinguishing the physical origin of the component. We review quintessence models with an emphasis on this dynamics and discuss classifications of the different physical behaviors. The pros and cons of various parameterizations are examined as well as the extension from scalar fields to other modifications of the Friedmann expansion equation. New results on the ability of cosmological data to distinguish among and between thawing and freezing fields are presented.
Plasticity of metal wires in torsion: molecular dynamics and dislocation dynamics simulations
Cai, Wei
Plasticity of metal wires in torsion: molecular dynamics and dislocation dynamics simulations-4040 Abstract The orientation dependent plasticity in metal nanowires is investigated using molecular dynamics metal wires controls the mechanisms of plastic deformation. For wires oriented along 110 , dislocations
Natural Dynamics for Combinatorial Optimization
Ovchinnikov, Igor V
2015-01-01T23:59:59.000Z
Stochastic and or natural dynamical systems (DSs) are dominated by sudden nonlinear processes such as neuroavalanches, gamma-ray bursts, solar flares, earthquakes etc. that exhibit scale-free statistics. These behaviors also occur in many nanosystems. On phase diagrams, these DSs belong to a finite-width phase that separates the phases of thermodynamic equilibrium and ordinary chaotic dynamics, and that is known under such names as intermittency, noise-induced chaos, and self-organized criticality. Within the recently formulated approximation-free cohomological theory of stochastic differential equations, the noise-induced chaos can be roughly interpreted as a noise-induced overlap between regular (integrable) and chaotic (non-integrable) deterministic dynamics so that DSs in this phase inherit the properties of the both. Here, we analyze this unique set of properties and conclude that such DSs must be the most efficient natural optimizers. Based on this understanding, we propose the method of the natural dyn...
Fissile solution dynamics: Student research
Hetrick, D.L.
1994-09-01T23:59:59.000Z
There are two research projects in criticality safety at the University of Arizona: one in dynamic simulation of hypothetical criticality accidents in fissile solutions, and one in criticality benchmarks using transport theory. We have used the data from nuclear excursions in KEWB, CRAC, and SILENE to help in building models for solution excursions. An equation of state for liquids containing gas bubbles has been developed and coupled to point-reactor dynamics in an attempt to predict fission rate, yield, pressure, and kinetic energy. It appears that radiolytic gas is unimportant until after the first peak, but that it does strongly affect the shape of the subsequent power decrease and also the dynamic pressure.
Kühne, Thomas D
2012-01-01T23:59:59.000Z
Computer simulations and molecular dynamics in particular, is a very powerful method to provide detailed and essentially exact informations of classical many-body problems. With the advent of \\textit{ab-initio} molecular dynamics, where the forces are computed on-the-fly by accurate electronic structure calculations, the scope of either method has been greatly extended. This new approach, which unifies Newton's and Schr\\"odinger's equations, allows for complex simulations without relying on any adjustable parameter. This review is intended to outline the basic principles as well as a survey of the field. Beginning with the derivation of Born-Oppenheimer molecular dynamics, the Car-Parrinello method as well as novel hybrid scheme that unifies best of either approach are discussed. The predictive power is demonstrated by a series of applications ranging from insulators to semiconductors and even metals in condensed phases.
Dynamics of Block Copolymer Nanocomposites
Mochrie, Simon G. J.
2014-09-09T23:59:59.000Z
A detailed study of the dynamics of cadmium sulfide nanoparticles suspended in polystyrene homopolymer matrices was carried out using X-ray photon correlation spectroscopy for temperatures between 120 and 180 °C. For low molecular weight polystyrene homopolymers, the observed dynamics show a crossover from diffusive to hyper-diffusive behavior with decreasing temperatures. For higher molecular weight polystyrene, the nanoparticle dynamics appear hyper-diffusive at all temperatures studied. The relaxation time and characteristic velocity determined from the measured hyper-diffusive dynamics reveal that the activation energy and underlying forces determined are on the order of 2.14 × 10?19 J and 87 pN, respectively. We also carried out a detailed X-ray scattering study of the static and dynamic behavior of a styrene– isoprene diblock copolymer melt with a styrene volume fraction of 0.3468. At 115 and 120 °C, we observe splitting of the principal Bragg peak, which we attribute to phase coexistence of hexagonal cylindrical and cubic double- gyroid structure. In the disordered phase, above 130 °C, we have characterized the dynamics of composition fluctuations via X-ray photon correlation spectroscopy. Near the peak of the static structure factor, these fluctuations show stretched-exponential relaxations, characterized by a stretching exponent of about 0.36 for a range of temperatures immediately above the MST. The corresponding characteristic relaxation times vary exponentially with temperature, changing by a factor of 2 for each 2 °C change in temperature. At low wavevectors, the measured relaxations are diffusive with relaxation times that change by a factor of 2 for each 8 °C change in temperature.
Statistics as a dynamical attractor
Michail Zak
2012-08-30T23:59:59.000Z
It is demonstrated that any statistics can be represented by an attractor of the solution to a corresponding systen of ODE coupled with its Liouville equation. Such a non-Newtonian representation allows one to reduce foundations of statistics to better established foundations of ODE. In addition to that, evolution to the attractor reveals possible micro-mechanisms driving random events to the final distribution of the corresponding statistical law. Special attention is concentrated upon the power law and its dynamical interpretation: it is demonstrated that the underlying dynamics supports a " violent reputation" of the power law statistics.
Accelerated dynamics simulations of nanotubes.
Uberuaga, B. P. (Blas Pedro); Stuart, S. J. (Steve J.); Voter, A. F.
2002-01-01T23:59:59.000Z
We report on the application of accelerated dynamics techniques to the study of carbon nanotubes. We have used the parallel replica method and temperature accelerated dynamics simulations are currently in progress. In the parallel replica study, we have stretched tubes at a rate significantly lower than that used in previous studies. In these preliminary results, we find that there are qualitative differences in the rupture of the nanotubes at different temperatures. We plan on extending this investigation to include nanotubes of various chiralities. We also plan on exploring unique geometries of nanotubes.
Fairness and dynamic pricing: comments
Hogan, William W.
2010-07-15T23:59:59.000Z
In ''The Ethics of Dynamic Pricing,'' Ahmad Faruqui lays out a case for improved efficiency in using dynamic prices for retail electricity tariffs and addresses various issues about the distributional effects of alternative pricing mechanisms. The principal contrast is between flat or nearly constant energy prices and time-varying prices that reflect more closely the marginal costs of energy and capacity. The related issues of fairness criteria, contracts, risk allocation, cost allocation, means testing, real-time pricing, and ethical policies of electricity market design also must be considered. (author)
Theoretical studies of combustion dynamics
Bowman, J.M. [Emory Univ., Atlanta, GA (United States)
1993-12-01T23:59:59.000Z
The basic objectives of this research program are to develop and apply theoretical techniques to fundamental dynamical processes of importance in gas-phase combustion. There are two major areas currently supported by this grant. One is reactive scattering of diatom-diatom systems, and the other is the dynamics of complex formation and decay based on L{sup 2} methods. In all of these studies, the authors focus on systems that are of interest experimentally, and for which potential energy surfaces based, at least in part, on ab initio calculations are available.
Dynamics of Protein Hydration Water
M. Wolf; S. Emmert; R. Gulich; P. Lunkenheimer; A. Loidl
2014-12-08T23:59:59.000Z
We present the frequency- and temperature-dependent dielectric properties of lysozyme solutions in a broad concentration regime, measured at subzero temperatures and compare the results with measurements above the freezing point of water and on hydrated lysozyme powder. Our experiments allow examining the dynamics of unfreezable hydration water in a broad temperature range including the so-called No Man's Land (160 - 235 K). The obtained results prove the bimodality of the hydration shell dynamics and are discussed in the context of the highly-debated fragile-to-strong transition of water.
Dynamic Transfer Capability Analysis with Wind Farms and Dynamic Loads
Pota, Himanshu Roy
. An investigation on the effect of dynamics loads, wind farms and flexible AC transmission system (FACTS) devices capability unnecessarily limits the power transfers and is a costly and inefficient use of a network with increasing loads, the need to transfer power over long transmission lines increases. Deregulation
Dynamical facilitation governs glassy dynamics in suspensions of colloidal ellipsoids
Chandan K. Mishra; K. Hima Nagamanasa; Rajesh Ganapathy; A. K. Sood; Shreyas Gokhale
2014-08-02T23:59:59.000Z
One of the greatest challenges in contemporary condensed matter physics is to ascertain whether the formation of glasses from liquids is fundamentally thermodynamic or dynamic in origin. While the thermodynamic paradigm has dominated theoretical research for decades, the purely kinetic perspective of the dynamical facilitation (DF) theory has attained prominence in recent times. In particular, recent experiments and simulations have highlighted the importance of facilitation using simple model systems composed of spherical particles. However, an overwhelming majority of liquids possess anisotropy in particle shape and interactions and it is therefore imperative to examine facilitation in complex glass-formers. Here, we apply the DF theory to systems with orientational degrees of freedom as well as anisotropic attractive interactions. By analyzing data from experiments on colloidal ellipsoids, we show that facilitation plays a pivotal role in translational as well as orientational relaxation. Further, we demonstrate that the introduction of attractive interactions leads to spatial decoupling of translational and rotational facilitation, which subsequently results in the decoupling of dynamical heterogeneities. Most strikingly, the DF theory can predict the existence of reentrant glass transitions based on the statistics of localized dynamical events, called excitations, whose duration is substantially smaller than the structural relaxation time. Our findings pave the way for systematically testing the DF approach in complex glass-formers and also establish the significance of facilitation in governing structural relaxation in supercooled liquids.
Los Alamos Dynamics Summer School-Past Programs
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Los Alamos Dynamics Summer School Los Alamos Dynamics Summer School Projects and Resources 2015 Los Alamos Dynamics Summer School Projects and Resources Contact Institute Director...
Benzene Dimer: Dynamic Structure and Thermodynamics Derived from...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Benzene Dimer: Dynamic Structure and Thermodynamics Derived from On-the-Fly ab initio DFT-D Molecular Dynamic Simulations. Benzene Dimer: Dynamic Structure and Thermodynamics...
DLFM library tools for large scale dynamic applications.
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
DLFM library tools for large scale dynamic applications DLFM library tools for large scale dynamic applications Large scale Python and other dynamic applications may spend huge...
Structure and Dynamics Vol.1 No.2: Editorial Commentary
White, Douglas R Institute of Mathematical Behavioral Science and Department of Anthropology; Manlove, Robert F.
2005-01-01T23:59:59.000Z
This issue of Structure and Dynamics is dedicated to thethe second issue of Structure and Dynamics with considerablein forthcoming issues of Structure and Dynamics. Color and
Dynamical friction on satellite galaxies
Michiko Fujii; Yoko Funato; Junichiro Makino
2006-06-23T23:59:59.000Z
For a rigid model satellite, Chandrasekhar's dynamical friction formula describes the orbital evolution quite accurately, when the Coulomb logarithm is chosen appropriately. However, it is not known if the orbital evolution of a real satellite with the internal degree of freedom can be described by the dynamical friction formula. We performed N-body simulation of the orbital evolution of a self-consistent satellite galaxy within a self-consistent parent galaxy. We found that the orbital decay of the simulated satellite is significantly faster than the estimate from the dynamical friction formula. The main cause of this discrepancy is that the stars stripped out of the satellite are still close to the satellite, and increase the drag force on the satellite through two mechanisms. One is the direct drag force from particles in the trailing tidal arm, a non-axisymmetric force that slows the satellite down. The other is the indirect effect that is caused by the particles remaining close to the satellite after escape. The force from them enhances the wake caused in the parent galaxy by dynamical friction, and this larger wake in turn slows the satellite down more than expected from the contribution of its bound mass. We found these two have comparable effects, and the combined effect can be as large as 20% of the total drag force on the satellite.
Relativistic dynamics without conservation laws
Bernhard Rothenstein; Stefan Popescu
2006-05-23T23:59:59.000Z
We show that relativistic dynamics can be approached without using conservation laws (conservation of momentum, of energy and of the centre of mass). Our approach avoids collisions that are not easy to teach without mnemonic aids. The derivations are based on the principle of relativity and on its direct consequence, the addition law of relativistic velocities.
Anholonomic frames in constrained dynamics
M. Crampin; T. Mestdag
2009-09-23T23:59:59.000Z
We demonstrate the usefulness of anholonomic frames in the contexts of nonholonomic and vakonomic systems. We take a consistently differential-geometric approach. As an application, we investigate the conditions under which the dynamics of the two systems will be consistent. A few illustrative examples confirm the results.
Complex Dynamics Effect on Distributions
Mehmet Tekkoyun
2009-01-09T23:59:59.000Z
In this study, Lagrangian and Hamiltonian systems, which are mathematical models of mechanical systems, were introduced on the horizontal and the vertical distributions of tangent and cotangent bundles. Finally, some geometrical and physical results related to Lagrangian and Hamiltonian dynamical systems were deduced.
Behavioral Dynamics of Human Locomotion
Gibson (1979) argued that "control lies not in the brain, but in the animal- environment system." To make with a structured environment guided by occurrent information. Here we attempt to model the behavioral dynam- ics of human walking and show how locomotor paths emerge "online" from simple laws for steering and obstacle
Water Dynamics at Rough Interfaces
Markus Rosenstihl; Kerstin Kämpf; Felix Klameth; Matthias Sattig; Michael Vogel
2014-07-21T23:59:59.000Z
We use molecular dynamics computer simulations and nuclear magnetic resonance experiments to investigate the dynamics of water at interfaces of molecular roughness and low mobility. We find that, when approaching such interfaces, the structural relaxation of water, i.e., the $\\alpha$ process, slows down even when specific attractive interactions are absent. This prominent effect is accompanied by a smooth transition from Vogel to Arrhenius temperature dependence and by a growing importance of jump events. Consistently, at protein surfaces, deviations from Arrhenius behavior are weak when free water does not exist. Furthermore, in nanoporous silica, a dynamic crossover of liquid water occurs when a fraction of solid water forms near 225 K and, hence, the liquid dynamics changes from bulk-like to interface-dominated. At sufficiently low temperatures, water exhibits a quasi-universal $\\beta$ process, which is characterized by an activation energy of $E_a\\!=\\!0.5$ eV and involves anisotropic reorientation about large angles. As a consequence of its large amplitude, the faster $\\beta$ process destroys essentially all orientational correlation, rendering observation of a possible slower $\\alpha$ process difficult in standard experiments. Nevertheless, we find indications for the existence of structural relaxation down to a glass transition of interfacial water near 185 K. Hydrated proteins show a highly restricted backbone motion with an amplitude, which decreases upon cooling and vanishes at comparable temperatures, providing evidence for a high relevance of water rearrangements in the hydration shell for secondary protein relaxations.
Dynamical systems probabilistic risk assessment.
Denman, Matthew R.; Ames, Arlo Leroy
2014-03-01T23:59:59.000Z
Probabilistic Risk Assessment (PRA) is the primary tool used to risk-inform nuclear power regulatory and licensing activities. Risk-informed regulations are intended to reduce inherent conservatism in regulatory metrics (e.g., allowable operating conditions and technical specifications) which are built into the regulatory framework by quantifying both the total risk profile as well as the change in the risk profile caused by an event or action (e.g., in-service inspection procedures or power uprates). Dynamical Systems (DS) analysis has been used to understand unintended time-dependent feedbacks in both industrial and organizational settings. In dynamical systems analysis, feedback loops can be characterized and studied as a function of time to describe the changes to the reliability of plant Structures, Systems and Components (SSCs). While DS has been used in many subject areas, some even within the PRA community, it has not been applied toward creating long-time horizon, dynamic PRAs (with time scales ranging between days and decades depending upon the analysis). Understanding slowly developing dynamic effects, such as wear-out, on SSC reliabilities may be instrumental in ensuring a safely and reliably operating nuclear fleet. Improving the estimation of a plant's continuously changing risk profile will allow for more meaningful risk insights, greater stakeholder confidence in risk insights, and increased operational flexibility.
Dynamical Spacetimes from Numerical Hydrodynamics
Allan Adams; Nathan Benjamin; Arvin Moghaddam; Wojciech Musial
2014-11-07T23:59:59.000Z
We numerically construct dynamical asymptotically-AdS$_4$ metrics by evaluating the fluid/gravity metric on numerical solutions of dissipative hydrodynamics in (2+1) dimensions. The resulting numerical metrics satisfy Einstein's equations in (3+1) dimensions to high accuracy.
Mesoscale Dynamics Spring Semester 2012
Birner, Thomas
ATS 735 Mesoscale Dynamics (3 cr) Spring Semester 2012 Instructor: Richard H. Johnson, Room ATS 305: There are no required texts. The recent book Mesoscale Meteorology in Midlatitudes by Markowski and Richardson covers with mesoscale-related research. A set of notes will be made available for the course, although we will not cover
Mesoscale Dynamics Spring Semester 2014
ATS 735 Mesoscale Dynamics (3 cr) Spring Semester 2014 Instructor: Richard H. Johnson, Room ATS 305: There are no required texts. The recent book Mesoscale Meteorology in Midlatitudes by Markowski and Richardson covers with mesoscale-related research. A set of notes will be made available for the course, although we will not cover
Climate Dynamics Observational, Theoretical and
Dong, Xiquan
1 23 Climate Dynamics Observational, Theoretical and Computational Research on the Climate System.6, and -22.5 Wm-2 , respectively, indicating a net cooling effect of clouds on the TOA radiation budget-2 , respectively, resulting in a larger net cooling effect of 2.9 Wm-2 in the model simu- lations
A Note on Tubular Brane Dynamics
Jose J. Blanco-Pillado
2005-04-19T23:59:59.000Z
We present new time dependent solutions for the dynamics of tubular D2-branes. We comment on the connection to cosmic string dynamics and explicitly give a few simple examples of oscillating and rotating brane configurations.
Analyzing the Dynamics of Chemical Networking Protocols
Vetter, Thomas
from several well-established fields, such as model linearization proposed in Metabolic Control congestion control protocol and highlight formerly unknown protocol features. Keywords: dynamic analysis;1 Introduction Predicting and controlling the dynamics of communication protocols are difficult but important
Lab experiences for teaching undergraduate dynamics
Lilienkamp, Katherine A. (Katherine Ann), 1969-
2003-01-01T23:59:59.000Z
This thesis describes several projects developed to teach undergraduate dynamics and controls. The materials were developed primarily for the class 2.003 Modeling Dynamics and Control I. These include (1) a set of ActivLab ...
Dynamic Nonprehensile Manipulation: Controllability, Planning, and Experiments
Mason, Matthew T.
Dynamic Nonprehensile Manipulation: Controllability, Planning, and Experiments Kevin M. Lynch 1 describes controllability, planning, and implementation of planar dynamic nonpre hensile manipulation. We with respect to the class of manipulable parts. It also allows a manipulator to control multiple parts
The nonlinear dynamics of the sea breeze
Walter, Kevin Robert
2004-11-15T23:59:59.000Z
The response of the land and sea breeze circulation to two highly simplified dynamical models is presented. The first dynamical model is the explicit specification of an oscillating interior heat source analogous to that from Rotunno (1983...
MIDDLE ATMOSPHERE DYNAMICS AT707 (3 credits)
., Holton, J. R., Leovy, C. B., Academic Press, 489 pp. Â· Atmospheric and Oceanic Fluid Dynamics, 2006 Review Articles: Â· Haynes, P. H., 2005: Stratospheric Dynamics. Annu. Rev. Fluid Mech., 37, 263Â 293
Bayesian inference of stochastic dynamical models
Lu, Peter Guang Yi
2013-01-01T23:59:59.000Z
A new methodology for Bayesian inference of stochastic dynamical models is developed. The methodology leverages the dynamically orthogonal (DO) evolution equations for reduced-dimension uncertainty evolution and the Gaussian ...
Two-Parameter Dynamics and Geometry
Zhi Hu; Mulin Yan; Sen Hu
2015-01-10T23:59:59.000Z
In this paper we present the two-parameter dynamics which is implied by the law of inertia in flat spacetime. A remarkable perception is that (A)dS4 geometry may emerge from the two-parameter dynamics, which exhibits some phenomenon of dynamics/ geometry correspondence. We also discuss the Unruh effects within the context of two-parameter dynamics. In the last section we construct various invariant actions with respect to the broken symmetry groups.
Granular Dynamics in Pebble Bed Reactor Cores
Laufer, Michael Robert
2013-01-01T23:59:59.000Z
a simulant fluid to match the dynamics of fuel pebbles andfuel pebbles through reactor cores with and without coupled fluid
Dynamics of similar populations Geza Meszena1
Meszéna, Géza
Dynamics of similar populations G´eza Mesz´ena1 , Mats Gyllenberg2 , Frans J. Jacobs3 , Hans A. J. Metz3,4 1 E¨otv¨os Univerity, Budapest 2 University of Helsinki 3 Leiden University 4 Adaptive Dynamics by population dynamics: dni dt = ri (n1, n2, . . . , nL) ni i = 1, 2, . . . , L ni 0 for losers. Dynamics
Dynamic Screening and Thermonuclear Reaction Rates
Andrei V. Gruzinov
1997-02-06T23:59:59.000Z
We show that there are no dynamic screening corrections to the Salpeter's enhancement factor in the weak-screening limit.
Dynamical instability of collapsing radiating fluid
Sharif, M., E-mail: msharif.math@pu.edu.pk; Azam, M., E-mail: azammath@gmail.com [University of the Punjab, Department of Mathematics (Pakistan)
2013-06-15T23:59:59.000Z
We take the collapsing radiative fluid to investigate the dynamical instability with cylindrical symmetry. We match the interior and exterior cylindrical geometries. Dynamical instability is explored at radiative and non-radiative perturbations. We conclude that the dynamical instability of the collapsing cylinder depends on the critical value {gamma} < 1 for both radiative and nonradiative perturbations.
Dynamics of Clouds Fall Semester 2012
ATS712 Dynamics of Clouds Fall Semester 2012 Meeting Times: T/Th: 9-10:15am Room: ATS 101-2pm Course Description: This class focuses on the general dynamics of cloud systems. Models of fog and other Tools / Skills Cotton, W.R., G.H. Bryan, and S.C. van den Heever, 2010: Storm and Cloud Dynamics
Vortex dynamics in 4 Banavara N. Shashikanth
Shashikanth, Banavara N.
Vortex dynamics in 4 Banavara N. Shashikanth Citation: J. Math. Phys. 53, 013103 (2012); doi: 10 OF MATHEMATICAL PHYSICS 53, 013103 (2012) Vortex dynamics in R4 Banavara N. Shashikantha) Mechanical and Aerospace dynamics of Euler's equations for a constant density fluid flow in R4 is studied. Most of the paper focuses
Spatiotemporal Dynamics of Insect-Fire Interactions
Moorcroft, Paul R.
Spatiotemporal Dynamics of Insect-Fire Interactions A thesis presented by Heather Joan Lynch Heather Joan Lynch Spatiotemporal Dynamics of Insect-Fire Interactions Abstract Insect outbreaks on the dynamics and composition of forest ecosystems. Although it has long been speculated that forest fires
FACILITATORY NEURAL DYNAMICS FOR PREDICTIVE EXTRAPOLATION
Choe, Yoonsuck
FACILITATORY NEURAL DYNAMICS FOR PREDICTIVE EXTRAPOLATION A Dissertation by HEE JIN LIM Submitted DYNAMICS FOR PREDICTIVE EXTRAPOLATION A Dissertation by HEE JIN LIM Submitted to Texas A&M University: Computer Science #12;iii ABSTRACT Facilitatory Neural Dynamics for Predictive Extrapolation. (August 2006
Dynamics of Dirac Fermions in Topological Insulators
Arnold, Anton
Dynamics of Dirac Fermions in Topological Insulators R. Hammer1 , C. Ertler1 , W. PÂ¨otz1 , and A.hammer@uni-graz.at Abstract We study the coherent dynamics of Dirac fermions on the surface of topological insulators in one topological insulators (TI) we investigate theoretically the dynamics of Dirac fermion wave packets on their 2
Socio-economic dynamics of biofuel
i Socio-economic dynamics of biofuel development in Asia Pacific Christina Schott Jakarta, 2009 #12;ii Socio-economic dynamics of biofuel development in Asia Pacific Socio-economic dynamics of biofuel of many biofuels has turned out to be far from sustainable. The carbon balance often proves to be negative
An Infrastructure for Adaptive Dynamic Optimization
Amarasinghe, Saman
An Infrastructure for Adaptive Dynamic Optimization Derek Bruening, Timothy Garnett, and Saman,timothyg,saman}@lcs.mit.edu Abstract Dynamic optimization is emerging as a promising ap- proach to overcome many of the obstacles static optimizations, there are very few for developing dynamic optimizations. We present a framework
Calculating Evolutionary Dynamics in Structured Populations
Nowak, Martin A.
Calculating Evolutionary Dynamics in Structured Populations Charles G. Nathanson1. , Corina E. Here we provide a general formula for calculating evolutionary dynamics in a wide class of structured) Calculating Evolutionary Dynamics in Structured Populations. PLoS Comput Biol 5(12): e1000615. doi:10
Origin and Structure of Dynamic Cooperative Networks
Hauert, Christoph
Origin and Structure of Dynamic Cooperative Networks Lucas Wardil & Christoph Hauert Department the local structure of the social network. Here we propose a simple theoretical framework to model dynamic among coop- erators24 . Social networks represent a dynamical abstraction of social structures
Routes to wild dynamics Lorenzo J. DIAZ
Ruiz, JesÃºs M.
Routes to wild dynamics Lorenzo J. DÂ´IAZ Departamento de MatemÂ´atica PontifÂ´icia Universidade Cat to wild dynamics. We first discuss the C2 persistent coexistence of infinitely many sinks associated (but good) idea of LÂ´opez de SÂ´a, we studied a paper on wild dynamics, the so-called Newhouse
Zevenhoven, Ron
Introduction to Computational Fluid Dynamics 424512 E #1 - rz Introduction to Computational Fluid Dynamics (iCFD) 424512.0 E, 5 sp / 3 sw 1. Introduction; Fluid dynamics (lecture 1 of 5) Ron Zevenhoven Ã?bo to Computational Fluid Dynamics 424512 E #1 - rz april 2013 Ã?bo Akademi Univ - Thermal and Flow Engineering
Dynamic Power ... Abbasian et. al.1 Wavelet-Based Dynamic Power Management for
Pedram, Massoud
Dynamic Power ... Abbasian et. al.1 Wavelet-Based Dynamic Power Management for Non and Phrases: Dynamic Power Management, Wavelet based prediction, non-stationary service request. Low Power and frequency scaling (DVFS) and dynamic power management (DPM), use runtime behavior of the system to reduce
2013-01-01T23:59:59.000Z
#12;THE JOURNAL OF CHEMICAL PHYSICS 139, 175101 (2013) Dynamic neutron scattering from, a conformational dynamics theory of dynamical neutron and X-ray scattering is developed, follow- ing our previous spectroscopy (dynamic neutron scattering) probes time correlations on the sub pico- to microsec- ond timescales
Dynamical Systems and Applications of Nonlinear Functional Analysis to Dynamical Systems
Zhang, Meirong
Dynamical Systems and Applications of Nonlinear Functional Analysis to Dynamical Systems Meirong consists of three parts. In Part 1 we introduce some basic concepts in dynamical systems, including limit sets, nonwandering sets, topological conjugacy, clas- sification of discrete dynamical systems under
Dynamical aspects of isotopic scaling
Veselsky, M
2006-01-01T23:59:59.000Z
Investigation of the effect of dynamical stage established that the increasing width of initial Gaussian distributions is reflected by significant modification of the slope of final isoscaling plots after de-excitation. For narrow initial Gaussian distributions, the slope of isoscaling plots assumes the limiting value for two individual initial nuclei while for wide initial Gaussian distributions the slope for hot fragments approaches the initial value. The slopes of isoscaling plots for final cold fragments increase due to secondary emission. The experimentally observed evolution of the isoscaling parameter in the multifragmentation of hot quasiprojectiles at 50 AMeV, fragmentation of 86Kr beam at 25 AMeV and multifragmentation of target spectator at relativistic energies was reproduced by the simulation with dynamical stage described using the appropriate model (deep inelastic transfer and incomplete fusion for Fermi energy domain and spectator-participant model for relativistic energies) and de-excitation ...
Predissociation dynamics of lithium iodide
Schmidt, H; Stienkemeier, F; Bogomolov, A S; Baklanov, A V; Reich, D M; Skomorowski, W; Koch, C P; Mudrich, M
2015-01-01T23:59:59.000Z
The predissociation dynamics of lithium iodide (LiI) in the first excited A-state is investigated for molecules in the gas phase and embedded in helium nanodroplets, using femtosecond pump-probe photoionization spectroscopy. In the gas phase, the transient Li+ and LiI+ ion signals feature damped oscillations due to the excitation and decay of a vibrational wave packet. Based on high-level ab initio calculations of the electronic structure of LiI and simulations of the wave packet dynamics, the exponential signal decay is found to result from predissociation predominantly at the lowest avoided X-A potential curve crossing, for which we infer a coupling constant V=650(20) reciprocal cm. The lack of a pump-probe delay dependence for the case of LiI embedded in helium nanodroplets indicates fast droplet-induced relaxation of the vibrational excitation.
Dynamic imaging with electron microscopy
Campbell, Geoffrey; McKeown, Joe; Santala, Melissa
2014-05-30T23:59:59.000Z
Livermore researchers have perfected an electron microscope to study fast-evolving material processes and chemical reactions. By applying engineering, microscopy, and laser expertise to the decades-old technology of electron microscopy, the dynamic transmission electron microscope (DTEM) team has developed a technique that can capture images of phenomena that are both very small and very fast. DTEM uses a precisely timed laser pulse to achieve a short but intense electron beam for imaging. When synchronized with a dynamic event in the microscope's field of view, DTEM allows scientists to record and measure material changes in action. A new movie-mode capability, which earned a 2013 R&D 100 Award from R&D Magazine, uses up to nine laser pulses to sequentially capture fast, irreversible, even one-of-a-kind material changes at the nanometer scale. DTEM projects are advancing basic and applied materials research, including such areas as nanostructure growth, phase transformations, and chemical reactions.
Interface dynamics for layered structures
Takao Ohta; David Jasnow
1997-07-17T23:59:59.000Z
We investigate dynamics of large scale and slow deformations of layered structures. Starting from the respective model equations for a non-conserved system, a conserved system and a binary fluid, we derive the interface equations which are a coupled set of equations for deformations of the boundaries of each domain. A further reduction of the degrees of freedom is possible for a non-conserved system such that internal motion of each domain is adiabatically eliminated. The resulting equation of motion contains only the displacement of the center of gravity of domains, which is equivalent to the phase variable of a periodic structure. Thus our formulation automatically includes the phase dynamics of layered structures. In a conserved system and a binary fluid, however, the internal motion of domains turns out to be a slow variable in the long wavelength limit because of concentration conservation. Therefore a reduced description only involving the phase variable is not generally justified.
Spin dynamics simulations at AGS
Huang, H.; MacKay, W.W.; Meot, F.; Roser, T.
2010-05-23T23:59:59.000Z
To preserve proton polarization through acceleration, it is important to have a correct model of the process. It has been known that with the insertion of the two helical partial Siberian snakes in the Alternating Gradient Synchrotron (AGS), the MAD model of AGS can not deal with a field map with offset orbit. The stepwise ray-tracing code Zgoubi provides a tool to represent the real electromagnetic fields in the modeling of the optics and spin dynamics for the AGS. Numerical experiments of resonance crossing, including spin dynamics in presence of the snakes and Q-jump, have been performed in AGS lattice models, using Zgoubi. This contribution reports on various results so obtained.
Simulation of Complex Fluids using Dissipative Particle Dynamics
Title: Simulation of Complex Fluids using Dissipative Particle Dynamics Abstract: Dissipative Particle Dynamics (DPD) is a relatively new mesoscopic method ...
Recent developments in dynamic fracture: Some perspectives
Fineberg, Jay
2015-01-01T23:59:59.000Z
We briefly review a number of important recent experimental and theoretical developments in the field of dynamic fracture. Topics include experimental validation of the equations of motion for straight tensile cracks (in both infinite media and strip geometries), validation of a new theoretical description of the near-tip fields of dynamic cracks incorporating weak elastic nonlinearities, a new understanding of dynamic instabilities of tensile cracks in both 2D and 3D, crack front dynamics, and the relation between frictional motion and dynamic shear cracks. Related future research directions are briefly discussed.
Recent developments in dynamic fracture: Some perspectives
Jay Fineberg; Eran Bouchbinder
2015-04-19T23:59:59.000Z
We briefly review a number of important recent experimental and theoretical developments in the field of dynamic fracture. Topics include experimental validation of the equations of motion for straight tensile cracks (in both infinite media and strip geometries), validation of a new theoretical description of the near-tip fields of dynamic cracks incorporating weak elastic nonlinearities, a new understanding of dynamic instabilities of tensile cracks in both 2D and 3D, crack front dynamics, and the relation between frictional motion and dynamic shear cracks. Related future research directions are briefly discussed.
Dynamic load balancing of applications
Wheat, S.R.
1997-05-13T23:59:59.000Z
An application-level method for dynamically maintaining global load balance on a parallel computer, particularly on massively parallel MIMD computers is disclosed. Global load balancing is achieved by overlapping neighborhoods of processors, where each neighborhood performs local load balancing. The method supports a large class of finite element and finite difference based applications and provides an automatic element management system to which applications are easily integrated. 13 figs.
Earth materials and earth dynamics
Bennett, K; Shankland, T. [and others
2000-11-01T23:59:59.000Z
In the project ''Earth Materials and Earth Dynamics'' we linked fundamental and exploratory, experimental, theoretical, and computational research programs to shed light on the current and past states of the dynamic Earth. Our objective was to combine different geological, geochemical, geophysical, and materials science analyses with numerical techniques to illuminate active processes in the Earth. These processes include fluid-rock interactions that form and modify the lithosphere, non-linear wave attenuations in rocks that drive plate tectonics and perturb the earth's surface, dynamic recrystallization of olivine that deforms the upper mantle, development of texture in high-pressure olivine polymorphs that create anisotropic velocity regions in the convecting upper mantle and transition zone, and the intense chemical reactions between the mantle and core. We measured physical properties such as texture and nonlinear elasticity, equation of states at simultaneous pressures and temperatures, magnetic spins and bonding, chemical permeability, and thermal-chemical feedback to better characterize earth materials. We artificially generated seismic waves, numerically modeled fluid flow and transport in rock systems and modified polycrystal plasticity theory to interpret measured physical properties and integrate them into our understanding of the Earth. This is the final report of a three-year, Laboratory-Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL).
Semiclassical analysis of quantum dynamics
Siyang Yang
2011-11-15T23:59:59.000Z
Simulating the molecular dynamics (MD) using classical or semi-classical trajectories provides important details for the understanding of many chemical reactions, protein folding, drug design, and solvation effects. MD simulations using trajectories have achieved great successes in the computer simulations of various systems, but it is difficult to incorporate quantum effects in a robust way. Therefore, improving quantum wavepacket dynamics and incorporating nonadiabatic transitions and quantum effects into classical and semi-classical molecular dynamics is critical as well as challenging. In this paper, we present a MD scheme in which a new set of equations of motion (EOM) are proposed to effectively propagate nuclear trajectories while conserving quantum mechanical energy which is critical for describing quantum effects like tunneling. The new quantum EOM is tested on a one-state one-dimensional and a two-state two-dimensional model nonadiabatic systems. The global quantum force experienced by each trajectory promotes energy redistribution among the bundle of trajectories, and thus helps the individual trajectory tunnel through the potential barrier higher than the energy of the trajectory itself. Construction of the new quantum force and EOM also provides a better way to treat the issue of back-reaction in mixed quantum-classical (MQC) methods, i.e. self-consistency between quantum degrees of freedom (DOF) and classical DOF.
Dynamics of evaporative colloidal patterning
C. Nadir Kaplan; Ning Wu; Shreyas Mandre; Joanna Aizenberg; L. Mahadevan
2014-12-04T23:59:59.000Z
Drying suspensions often leave behind complex patterns of particulates, as might be seen in the coffee stains on a table. Here we consider the dynamics of periodic band or uniform solid film formation on a vertical plate suspended partially in a drying colloidal solution. Direct observations allow us to visualize the dynamics of the band and film deposition, and the transition in between when the colloidal concentration is varied. A minimal theory of the liquid meniscus motion along the plate reveals the dynamics of the banding and its transition to the filming as a function of the ratio of deposition and evaporation rates. We also provide a complementary multiphase model of colloids dissolved in the liquid, which couples the inhomogeneous evaporation at the evolving meniscus to the fluid and particulate flows and the transition from a dilute suspension to a porous plug. This allows us to determine the concentration dependence of the bandwidth and the deposition rate. Together, our findings allow for the control of drying-induced patterning as a function of the colloidal concentration and evaporation rate.
Brownian dynamics without Green's functions
Delong, Steven; Donev, Aleksandar, E-mail: donev@courant.nyu.edu [Courant Institute of Mathematical Sciences, New York University, New York, New York 10012 (United States)] [Courant Institute of Mathematical Sciences, New York University, New York, New York 10012 (United States); Usabiaga, Florencio Balboa; Delgado-Buscalioni, Rafael [Departamento de Física Teórica de la Materia Condensada and Condensed Matter Physics Center (IFIMAC), Univeridad Autónoma de Madrid, Madrid 28049 (Spain)] [Departamento de Física Teórica de la Materia Condensada and Condensed Matter Physics Center (IFIMAC), Univeridad Autónoma de Madrid, Madrid 28049 (Spain); Griffith, Boyce E. [Courant Institute of Mathematical Sciences, New York University, New York, New York 10012 (United States) [Courant Institute of Mathematical Sciences, New York University, New York, New York 10012 (United States); Leon H. Charney Division of Cardiology, Department of Medicine, New York University School of Medicine, New York, New York 10016 (United States)
2014-04-07T23:59:59.000Z
We develop a Fluctuating Immersed Boundary (FIB) method for performing Brownian dynamics simulations of confined particle suspensions. Unlike traditional methods which employ analytical Green's functions for Stokes flow in the confined geometry, the FIB method uses a fluctuating finite-volume Stokes solver to generate the action of the response functions “on the fly.” Importantly, we demonstrate that both the deterministic terms necessary to capture the hydrodynamic interactions among the suspended particles, as well as the stochastic terms necessary to generate the hydrodynamically correlated Brownian motion, can be generated by solving the steady Stokes equations numerically only once per time step. This is accomplished by including a stochastic contribution to the stress tensor in the fluid equations consistent with fluctuating hydrodynamics. We develop novel temporal integrators that account for the multiplicative nature of the noise in the equations of Brownian dynamics and the strong dependence of the mobility on the configuration for confined systems. Notably, we propose a random finite difference approach to approximating the stochastic drift proportional to the divergence of the configuration-dependent mobility matrix. Through comparisons with analytical and existing computational results, we numerically demonstrate the ability of the FIB method to accurately capture both the static (equilibrium) and dynamic properties of interacting particles in flow.
Brownian Dynamics without Green's Functions
S. Delong; F. Balboa Usabiaga; R. Delgado-Buscalioni; B. E. Griffith; A. Donev
2015-05-27T23:59:59.000Z
We develop a Fluctuating Immersed Boundary (FIB) method for performing Brownian dynamics simulations of confined particle suspensions. Unlike traditional methods which employ analytical Green's functions for Stokes flow in the confined geometry, the FIB method uses a fluctuating finite-volume Stokes solver to generate the action of the response functions "on the fly". Importantly, we demonstrate that both the deterministic terms necessary to capture the hydrodynamic interactions among the suspended particles, as well as the stochastic terms necessary to generate the hydrodynamically-correlated Brownian motion, can be generated by solving the steady Stokes equations numerically only once per time step. This is accomplished by including a stochastic contribution to the stress tensor in the fluid equations consistent with fluctuating hydrodynamics. We develop novel temporal integrators that account for the multiplicative nature of the noise in the equations of Brownian dynamics and the strong dependence of the mobility on the configuration for confined systems. Notably, we propose a random finite difference approach to approximating the stochastic drift proportional to the divergence of the configuration-dependent mobility matrix. Through comparisons with analytical and existing computational results, we numerically demonstrate the ability of the FIB method to accurately capture both the static (equilibrium) and dynamic properties of interacting particles in flow.
From dynamical systems to renormalization
Menous, Frédéric [Département de Mathématiques, Bât. 425, UMR 8628, CNRS, Université Paris-Sud, 91405 Orsay Cedex (France)] [Département de Mathématiques, Bât. 425, UMR 8628, CNRS, Université Paris-Sud, 91405 Orsay Cedex (France)
2013-09-15T23:59:59.000Z
In this paper we study logarithmic derivatives associated to derivations on completed graded Lie algebra, as well as the existence of inverses. These logarithmic derivatives, when invertible, generalize the exp-log correspondence between a Lie algebra and its Lie group. Such correspondences occur naturally in the study of dynamical systems when dealing with the linearization of vector fields and the non linearizability of a resonant vector fields corresponds to the non invertibility of a logarithmic derivative and to the existence of normal forms. These concepts, stemming from the theory of dynamical systems, can be rephrased in the abstract setting of Lie algebra and the same difficulties as in perturbative quantum field theory (pQFT) arise here. Surprisingly, one can adopt the same ideas as in pQFT with fruitful results such as new constructions of normal forms with the help of the Birkhoff decomposition. The analogy goes even further (locality of counter terms, choice of a renormalization scheme) and shall lead to more interactions between dynamical systems and quantum field theory.
Understanding what lies beneath: Groundwater critical to Texas water
Wythe, Kathy
2008-01-01T23:59:59.000Z
, driller, construction and comple- tion data, aquifer, water level, and water quality data. Of the 1,000,000 plus water wells drilled in Texas over the past 100 years, more than 130,000 have been inventoried and the data entered into the TWDB... the National Water-Quality Assessment (NAWQA) Program in 1991. More information can be obtained at http://water.usgs.gov/nawqa/studies/praq/. Other USGS groundwater Web sites include: Ground-Water Data for Texas: (http...
Beneath the valley of the noncommutative arithmetic-geometric ...
2012-02-19T23:59:59.000Z
mean inequality: conjectures, case-studies, and consequences. Benjamin ... We provide a deterministic worst-case bound on the gap between the discrep-.
Beneath the Surface of Giant Planets: Evolution, Structure, and Composition
Kelly Miller, Neil L.
2013-01-01T23:59:59.000Z
tidal power to luminosity, describes how important tidal effects are to the energytidal power is uniformly deposited into the envelope of the planet. The net energy
Intermittent upwelling of asthenosphere beneath the Gregory Rift, Kenya
Tatsumi, Yoshiyuki (Univ. of Tasmania (Australia) Kyoto Univ. (Japan)); Kimura, Nobukazu (Kyoto Univ. (Japan)); Itaya, Tetsumaru (Okayama Univ. of Science (Japan)); Koyaguchi, Takehiro (Kumamoto Univ. (Japan)); Suwa, Kanenori (Nagoya Univ. (Japan))
1991-06-01T23:59:59.000Z
K-Ar dates and chemical compositions of basalts in the Gregory Rift, Kenya, demonstrate marked secular variation of lava chemistry. Two magmatic cycles characterized by incompatible element relative depletion are recognized; both occurring immediately after the peak of basaltic volcanism and coeval with both trachyte/phonolite volcanism and domal uplift of the region. These cycles may be attributed to increasing degree of partial melting of mantle source material in association with thinning of the lithosphere by thermal erosion through contact with hot upwelling asthenospheric mantle. Cyclic variation in asthenosphere upwelling may be considered an important controlling process in the evolution of the Gregory Rift.
Beneath the Surface of Giant Planets: Evolution, Structure, and Composition
Kelly Miller, Neil L.
2013-01-01T23:59:59.000Z
iii of Giant Expolanets 3.3.2 PlanetEvolution of Giant Planets . . . . . . . . . . . 2 Coupled3 Applications of Giant Planet Thermal Evolution Model 3.1
Beneath the Surface of Giant Planets: Evolution, Structure, and Composition
Kelly Miller, Neil L.
2013-01-01T23:59:59.000Z
thermal evolution model, including energy-limited mass loss,Evaporative Mass Loss Model For energy-limited evaporativeradii. Using an energy-limited escape model, we estimate a
Mapping the Hydrothermal System Beneath the Western Moat of Long...
shallow coreholes in the caldera, and DOEDGT is considering the initiation of a multiphase program to drill a deep hole for geophysical observations and sampling of the near...
aquifer beneath yucca: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AQUIFER BIBI. IOGRAPHY... Wauters, John F 2012-06-07 38 Modelling Bioremediation of Uranium Contaminated Aquifers Edinburgh, University of - Research Archive Summary:...
Frequency-magnitude distribution of microearthquakes beneath the 9500
Bohnenstiehl, Delwayne
at shallow depths and relatively high stress levels (or low pore pressures) observed away from the axial zone there also exists significant spatial variability. This indicates that stress conditions and/or structural. As a byproduct of this b value analysis, the detection capabilities of the array are assessed empirically
Temporal Velocity Variations beneath the Coso Geothermal Field...
Field Observed using Seismic Double Difference Tomography of Compressional and Shear Wave Arrival Times Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference...
A Preparation Zone For Volcanic Explosions Beneath Naka-Dake...
a characteristic cycle of activity that consists of the formation of a crater lake, drying-up of the lake water, and finally a Strombolian-type eruption. Recent observations...
Flow Beneath a Ship at Small Underkeel Clearance Tim Gourlay
the leading order squat and wave resistance of a ship traveling in calm water, in the case where the water in this case) kinematic viscosity of the fluid (we will consider salt water at 20 deg C, for which 1.04 Ã? 10 THEORETICAL RESEARCH has been done into the flow around a ship operating in shallow water, using Prandtl
Inferences On The Hydrothermal System Beneath The Resurgent Dome...
Usa, From Recent Pumping Tests And Geochemical Sampling Jump to: navigation, search OpenEI Reference LibraryAdd to library Journal Article: Inferences On The Hydrothermal System...
3-D Seismic Methods for Shallow Imaging Beneath Pavement
Miller, Brian
2013-05-31T23:59:59.000Z
The research presented in this dissertation focuses on survey design and acquisition of near-surface 3D seismic reflection and surface wave data on pavement. Increased efficiency for mapping simple subsurface interfaces through a combined use...
The 1989 Earthquake Swarm Beneath Mammoth Mountain, California...
extension of the youthful Mono-Inyo volcanic chain, which last erupted 500 to 600 years ago, point to a magmatic source for the modest but persistent influx of strain energy...
Understanding what lies beneath: Groundwater critical to Texas water
Wythe, Kathy
2008-01-01T23:59:59.000Z
of organizations and programs associated with groundwater in Texas: Aquifers: Geological formations that can store, transmit, and yield groundwater to a well or spring. Groundwater comes from nine major and 21 minor aquifers in Texas. Confined aquifer: Layer... of water that is held between two layers of clay. The recharge area is limited to land surface where the aquifer?s geologic material is exposed to the land surface. Unconfined aquifer: Layer of water that has a confining layer on bottom and a layer...
Characterization of secondary collection system flows beneath synthetic composite liners
Groenleer, M.E. [Wenck Associates, Inc., Grand Rapids, MI (United States)
1995-12-31T23:59:59.000Z
Secondary liner systems for landfills are becoming more common. Subtitle D may be construed to require secondary liners to meet monitorability requirements for new units. Michigan requires secondary liners in many situations, most commonly at previously contaminated sites to allow for differential monitoring of the new cell(s). Much work has been done in characterizing the flow of liquids through FML/clay composite liners but less is known about flows through FML/geosynthetic clay liner (GCL) composite liners or through isolated FMLs. Flow and chemical data are examined from two Michigan landfills employing different configurations of all synthetic primary and secondary liners. The data is examined for apparent trends. Conclusions are drawn about the application of generic action flow rates as a regulatory standard to these systems and the chemical characteristics of the liquids in secondary systems. Calculations are presented to achieve a realistic action leakage rate for these systems.
Melt Zones Beneath Five Volcanic Complexes in California: An...
(2) The Geysers-Clear Lake, (3) Long Valley caldera, (4) Coso volcanic field, and (5) Medicine Lake volcano, all located in California and all selected on the basis of recent...
Melt zones beneath five volcanic complexes in California: an...
(2) The Geysers-Clear Lake, (3) Long Valley caldera, (4) Coso volcanic field, and (5) Medicine Lake volcano, all located in California and all selected on the basis of recent...
Temperatures at the Base of the Seismogenic Crust Beneath Long...
Activities (2) Ground Gravity Survey At Long Valley Caldera Geothermal Area (Battaglia, Et Al., 2003) Modeling-Computer Simulations At Long Valley Caldera Geothermal Area...
arc plutons beneath: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Websites Summary: -grade metasediments, with the following succession: leucocratic granites, biotite-granodiorites (monzodiorites), hornblende-granodiorites...
Evidence For Gas And Magmatic Sources Beneath The Yellowstone Volcanic
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Structure and Stratigraphy Beneath a Young Phreatic Vent: South Inyo
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Temporal Velocity Variations beneath the Coso Geothermal Field Observed
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The 1989 Earthquake Swarm Beneath Mammoth Mountain, California: An Initial
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 onYou are now leaving Energy.gov You are now leaving Energy.gov YouKizildere IRaghuraji Agro Industries PvtStratosolarTharaldson Ethanol LLC Jump to: navigation, searchLook at the 4 May
Brownian Dynamics Simulation of Protein Solutions: Structural and Dynamical Properties
Mereghetti, Paolo; Gabdoulline, Razif; Wade, Rebecca C.
2010-12-01T23:59:59.000Z
The study of solutions of biomacromolecules provides an important basis for understanding the behavior of many fundamental cellular processes, such as protein folding, self-assembly, biochemical reactions, and signal transduction. Here, we describe a Brownian dynamics simulation procedure and its validation for the study of the dynamic and structural properties of protein solutions. In the model used, the proteins are treated as atomically detailed rigid bodies moving in a continuum solvent. The protein-protein interaction forces are described by the sum of electrostatic interaction, electrostatic desolvation, nonpolar desolvation, and soft-core repulsion terms. The linearized Poisson-Boltzmann equation is solved to compute electrostatic terms. Simulations of homogeneous solutions of three different proteins with varying concentrations, pH, and ionic strength were performed. The results were compared to experimental data and theoretical values in terms of long-time self-diffusion coefficients, second virial coefficients, and structure factors. The results agree with the experimental trends and, in many cases, experimental values are reproduced quantitatively. There are no parameters specific to certain protein types in the interaction model, and hence the model should be applicable to the simulation of the behavior of mixtures of macromolecules in cell-like crowded environments.
A Relativistic Dynamical Collapse Model
Philip Pearle
2014-12-21T23:59:59.000Z
A model is discussed where all operators are constructed from a quantum scalar field whose energy spectrum takes on all real values. The Schr\\"odinger picture wave function depends upon space and time coordinates for each particle, as well as an inexorably increasing evolution parameter $s$ which labels a foliation of space-like hypersurfaces. The model is constructed to be manifestly Lorentz invariant in the interaction picture. Free particle states and interactions are discussed in this framework. Then, the formalism of the CSL (Continuous Spontaneous Localization) theory of dynamical collapse is applied. The collapse-generating operator is chosen to to be the particle number space-time density. Unlike previous relativistically invariant models, the vacuum state is not excited. The collapse dynamics depends upon two parameters, a parameter $\\Lambda$ which represents the collapse rate/volume and a scale factor $\\ell$. A common example of collapse dynamics, involving a clump of matter in a superposition of two locations, is analyzed. The collapse rate is shown to be identical to that of non-relativistic CSL when the GRW-CSL choice of $\\ell=a=10^{-5}$cm, is made, along with $\\Lambda=\\lambda/a^{3}$ (GRW-CSL choice $\\lambda=10^{-16}s^{-1}$). However, it is also shown that the change of mass of a nucleon over the age of the universe is then unacceptably large. The case where $\\ell$ is the size of the universe is then considered. It is shown that the collapse behavior is satisfactory and the change of mass over the age of the universe is acceptably small, when $\\Lambda= \\lambda/\\ell a^{2}$.
Why quantum dynamics is linear
Thomas F. Jordan
2007-02-16T23:59:59.000Z
Quantum dynamics is linear. How do we know? From theory or experiment? The history of this question is reviewed. Nonlinear generalizations of quantum mechanics have been proposed. They predict small but clear nonlinear effects, which very accurate experiments have not seen. Is there a reason in principle why nonlinearity is not found? Is it impossible? Does quantum dynamics have to be linear? Attempts to prove this have not been decisive, because either their assumptions are not compelling or their arguments are not conclusive. The question has been left unsettled. There is a simple answer, based on a simple assumption. It was found in two steps separated by 44 years. They are steps back to simpler and more compelling assumptions. A proof of the assumptions of the Wigner-Bargmann proof has been known since 1962. It assumes that the maps of density matrices in time are linear. For this step, it is also assumed that density matrices are mapped one-to-one onto density matrices. An alternative is to assume that pure states are mapped one-to-one onto pure states and that entropy does not decrease. In a step taken in 2006, it is proved that the maps of density matrices in time are linear. It is assumed, as in the earlier step, that at each time the physical quantities and states are described by the usual linear structures of quantum mechanics, so the question is only about how things change in time. Beyond that, the proof assumes only that the dynamics does not depend on anything outside the system, but must allow the system to be described as part of a larger system.
Dynamic reduction, Version 1. 0
Rogers, G.J.; Wong, D.Y.; Ottevangers, J.; Wang, L. (Ontario Hydro, Toronto, ON (Canada))
1993-04-01T23:59:59.000Z
This report describes the theoretical background of the EPRI Dynamic Reduction DYNRED V 1.0. EPRI initiated research under project RP763 to develop the original reduction program DYNEQU. This program was the first to be based on the concept of aggregating of coherent groups of synchronous generators into a single equivalent generator model. While technically advanced, DYNEQU proved difficult to use. Since then, the stability problems encountered in power system planning and operations have changed. The emphasis on first swing transient stability has been replaced by emphasis on inter-area oscillations and voltage stability. The method of identification of coherent generators used in DYNEQU is based on the comparison of rotor angle swings, in a linearized system model, following a fault. It has been shown that this method of coherency identification is good for first swing stability. For inter-area oscillation studies, this method of generator aggregation is less accurate. Far better, are identification methods based on the structure of the power system. Because of these changes in the requirements for reduced order power system models, a new dynamic reduction program (DYNRED) has been developed under EPRI project RP2447-1. It is coherency based, as is DYNEQU, but it has structurally based coherency identification methods in addition to the method used in DYNEQU. This report describes the techniques used in DYNRED, that is: Coherency Identification; Network Reduction; Method of Aggregation, Generator Aggregation, Excitation Aggregation, Primemover/Governor Aggregation. An example of the application of DYNRED to the reduction of a large interconnected power system model is also presented. DYNRED uses the special modeling and network solution techniques developed to enable systems having up to 12,000 bus to be studied. Dynamic data is completely compatible between MASS, PEALS, and the EPRI Extended Transient Midterm Stability Program (ETMSP).
Competitive Dynamics of Web Sites
Sebastian M. Maurer; Bernardo A. Huberman
2000-03-17T23:59:59.000Z
We present a dynamical model of web site growth in order to explore the effects of competition among web sites and to determine how they affect the nature of markets. We show that under general conditions, as the competition between sites increases, the model exhibits a sudden transition from a regime in which many sites thrive simultaneously, to a "winner take all market" in which a few sites grab almost all the users, while most other sites go nearly extinct. This prediction is in agreement with recent measurements on the nature of electronic markets.
The dynamic sphere test problem
Chabaud, Brandon M. [Los Alamos National Laboratory; Brock, Jerry S. [Los Alamos National Laboratory; Smith, Brandon M. [Los Alamos National Laboratory
2012-05-16T23:59:59.000Z
In this manuscript we define the dynamic sphere problem as a spherical shell composed of a homogeneous, linearly elastic material. The material exhibits either isotropic or transverse isotropic symmetry. When the problem is formulated in material coordinates, the balance of mass equation is satisfied automatically. Also, the material is assumed to be kept at constant temperature, so the only relevant equation is the equation of motion. The shell has inner radius r{sub i} and outer radius r{sub o}. Initially, the shell is at rest. We assume that the interior of the shell is a void and we apply a time-varying radial stress on the outer surface.
Dynamically cured thermoplastic olefin polymers
Hazelton, D.R.; Puydak, R.C.; Booth, D.A.
1986-08-19T23:59:59.000Z
A thermoplastic composition is described comprising a polyolefin resin, a first rubber component selected from the group consisting of polyisobutylene, and ethylene propylene copolymer (EPM) and EPDM and a second rubber component selected from the group consisting of halogenated butyl rubber and polychoroprene, the second rubber component being cured utilizing a curative other than a peroxide, which is a vulcanizing agent for the second rubber but not for the first rubber, the second rubber being cured to a fully vulcanized state by dynamic vulcanization in the presence of the polyolefin resin and first rubber compound.
Gas Dynamics in Galaxy Mergers
Joshua E. Barnes
2000-10-07T23:59:59.000Z
In interacting and merging galaxies, gas is subject to direct hydrodynamic effects as well as tidal forces. One consequence of interactions is the rapid inflows of gas which may fuel starbursts and AGN. But gas dynamics is not limited to inflows; a small survey of equal-mass and unequal-mass encounters produces a wide variety of features, including plumes between galaxies, extended disks formed by infall of tidal debris, and counterrotating nuclear disks. An even richer spectrum of behavior awaits better thermodynamic models for gas in merging galaxies.
Dynamically Responsive Infrared Window Coatings
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
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Solar Dynamics | Open Energy Information
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Predictive Dynamic Security Assessment through Advanced Computing
Huang, Zhenyu; Diao, Ruisheng; Jin, Shuangshuang; Chen, Yousu
2014-11-30T23:59:59.000Z
Abstract— Traditional dynamic security assessment is limited by several factors and thus falls short in providing real-time information to be predictive for power system operation. These factors include the steady-state assumption of current operating points, static transfer limits, and low computational speed. This addresses these factors and frames predictive dynamic security assessment. The primary objective of predictive dynamic security assessment is to enhance the functionality and computational process of dynamic security assessment through the use of high-speed phasor measurements and the application of advanced computing technologies for faster-than-real-time simulation. This paper presents algorithms, computing platforms, and simulation frameworks that constitute the predictive dynamic security assessment capability. Examples of phasor application and fast computation for dynamic security assessment are included to demonstrate the feasibility and speed enhancement for real-time applications.
Dynamical Heterogeneities in Grains and Foams
Olivier Dauchot; Douglas J. Durian; Martin van Hecke
2010-10-05T23:59:59.000Z
Dynamical heterogeneities have been introduced in the context of the glass transition of molecular liquids and the lengthscale associated with them has been argued to be at the origin of the observed quasi-universal behaviour of glassy systems. Dense amorphous packings of granular media and foams also exhibit slow dynamics, intermittency and heterogeneities. We review a number of recent experimental studies of these systems, where one has direct access to the relevant space-time dynamics, allowing for direct visualisations of the dynamical heterogeneities. On one hand these visualisations provide a unique opportunity to access the microscopic mechanisms responsible for the growth of dynamical correlations. On the other hand focussing on the differences in these heterogeneities in microscopically different systems allows to discuss the range of the analogies between molecular thermal glasses and athermal glasses such as granular media and foams. Finally this review is the opportunity to discuss various approaches to actually extract quantitatively the dynamical lengthscale from experimental data.
Reservoir cross-over in entanglement dynamics
L. Mazzola; S. Maniscalco; K. -A. Suominen; B. M. Garraway
2009-08-28T23:59:59.000Z
We study the effects of spontaneous emission on the entanglement dynamics of two qubits interacting with a common Lorentzian structured reservoir. We assume that the qubits are initially prepared in a Bell-like state. We focus on the strong coupling regime and study the entanglement dynamics for different regions of the spontaneous emission decay parameter. This investigation allows us to explore the cross-over between common and independent reservoirs in entanglement dynamics.
Dynamical analysis of highly excited molecular spectra
Kellman, M.E. [Univ. of Oregon, Eugene (United States)
1993-12-01T23:59:59.000Z
The goal of this program is new methods for analysis of spectra and dynamics of highly excited vibrational states of molecules. In these systems, strong mode coupling and anharmonicity give rise to complicated classical dynamics, and make the simple normal modes analysis unsatisfactory. New methods of spectral analysis, pattern recognition, and assignment are sought using techniques of nonlinear dynamics including bifurcation theory, phase space classification, and quantization of phase space structures. The emphasis is chaotic systems and systems with many degrees of freedom.
Quantum discord dynamics in structured reservoirs
Z. -K. Su; S. -J. Jiang
2011-05-25T23:59:59.000Z
The non-Markovian master equations are derived to study quantum discord dynamics of two qubits coupled to a common reservoir and two independent reservoirs, respectively. We compare the dynamics under different parameters, such as reservoir spectra and resonant parameters, at high temperature and at zero temperature. The results indicate that the dynamics at these two extreme temperatures share similar characters, as well as differences.
Radiation in molecular dynamic simulations
Glosli, J; Graziani, F; More, R; Murillo, M; Streitz, F; Surh, M
2008-10-13T23:59:59.000Z
Hot dense radiative (HDR) plasmas common to Inertial Confinement Fusion (ICF) and stellar interiors have high temperature (a few hundred eV to tens of keV), high density (tens to hundreds of g/cc) and high pressure (hundreds of Megabars to thousands of Gigabars). Typically, such plasmas undergo collisional, radiative, atomic and possibly thermonuclear processes. In order to describe HDR plasmas, computational physicists in ICF and astrophysics use atomic-scale microphysical models implemented in various simulation codes. Experimental validation of the models used to describe HDR plasmas are difficult to perform. Direct Numerical Simulation (DNS) of the many-body interactions of plasmas is a promising approach to model validation but, previous work either relies on the collisionless approximation or ignores radiation. We present a new numerical simulation technique to address a currently unsolved problem: the extension of molecular dynamics to collisional plasmas including emission and absorption of radiation. The new technique passes a key test: it relaxes to a blackbody spectrum for a plasma in local thermodynamic equilibrium. This new tool also provides a method for assessing the accuracy of energy and momentum exchange models in hot dense plasmas. As an example, we simulate the evolution of non-equilibrium electron, ion, and radiation temperatures for a hydrogen plasma using the new molecular dynamics simulation capability.
Dynamic Testing of Gasifier Refractory
Michael D. Mann; Devdutt Shukla; Xi Hong; John P. Hurley
2004-09-27T23:59:59.000Z
The University of North Dakota (UND) Chemical Engineering Department in conjunction with the UND Energy & Environmental Research Center (EERC) have initiated a program to thoroughly examine the combined chemical (reaction and phase change) and physical (erosion) effects experienced by a variety of refractory materials during both normal operation and thermal cycling under slagging coal gasification conditions. The goal of this work is to devise a mechanism of refractory loss under these conditions. The controlled-atmospheric dynamic corrodent application furnace (CADCAF) is being utilized to simulate refractory/slag interactions under dynamic conditions that more realistically simulate the environment in a slagging coal gasifier than any of the static tests used previously by refractory manufacturers and researchers. Shakedown testing of the CADCAF has been completed. Samples of slag and refractory from the Tampa Electric Polk Power Station have been obtained for testing in the CADCAF. The slag has been dried and sieved to the size needed for our flowing slag corrosion tests. Screening tests are in currently in progress. Detailed analysis of corrosion rates from the first tests is in progress.
Dynamic Testing of Gasifier Refractory
Michael D. Mann; Devdutt Shukla; John P. Hurley
2003-09-27T23:59:59.000Z
The University of North Dakota (UND) Chemical Engineering Department in conjunction with the UND Energy & Environmental Research Center (EERC) have initiated a program to thoroughly examine the combined chemical (reaction and phase change) and physical (erosion) effects experienced by a variety of refractory materials during both normal operation and thermal cycling under slagging coal gasification conditions. The goal of this work is to devise a mechanism of refractory loss under these conditions. The controlled-atmospheric dynamic corrodent application furnace (CADCAF) is being utilized to simulate refractory/slag interactions under dynamic conditions that more realistically simulate the environment in a slagging coal gasifier than any of the static tests used previously by refractory manufacturers and researchers. Shakedown testing of the CADCAF is in progress. Samples of slag and refractory from the Tampa Electric Polk Power Station have been obtained for testing in the CADCAF. The slag has been dried and sieved to the size needed for our flowing slag corrosion tests. Testing is expected to begin in October.
Dynamics of hydrogen in silicon
Shirai, Koun [ISIR, Osaka University, 8-1, Mihogaoka, Ibaraki, Osaka 567-0047 (Japan); Hamada, Ikutaro [International Center for Materials Nanoarchitectonics, NIMS, 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan); Katayama-Yoshida, Hiroshi [Grad. School of Eng. Sci., Osaka University, 1-3, Machikaneyama, Toyonaka 560-8531 (Japan)
2014-02-21T23:59:59.000Z
The frequency of local hydrogen vibration in silicon and its decay process have been studied theoretically. It is believed that the H in Si is located at the bond center in equilibrium. By analyzing the discrepancy between the frequency of the antisymmetric stretching mode in a frozen-phonon calculation and the frequency in a molecular dynamic simulation, it is found that the Si–H–Si bond is dynamically bending. The reason is that the adiabatic potential along a direction perpendicular to the bond axis is so flat that random thermal motion of atoms easily scatters the H atom from the axis. A fast relaxation (?1 ps) around the axis hides this bending from observation by slow-response measurements. One consequence of the bending is that it renders the frequency of the symmetric stretching mode higher than when the bond is not bent. Another, more interesting consequence of this bending is the fast decay rate of the antisymmetric stretching mode, in spite of its local-mode character. Again, the ease of conversion of the H motion from parallel to perpendicular to the bond axis is the cause of this fast decay, which is otherwise difficult to explain by a simple combination law of frequencies.
Kinetic limits of dynamical systems
Jens Marklof
2014-08-06T23:59:59.000Z
Since the pioneering work of Maxwell and Boltzmann in the 1860s and 1870s, a major challenge in mathematical physics has been the derivation of macroscopic evolution equations from the fundamental microscopic laws of classical or quantum mechanics. Macroscopic transport equations lie at the heart of many important physical theories, including fluid dynamics, condensed matter theory and nuclear physics. The rigorous derivation of macroscopic transport equations is thus not only a conceptual exercise that establishes their consistency with the fundamental laws of physics: the possibility of finding deviations and corrections to classical evolution equations makes this subject both intellectually exciting and relevant in practical applications. The plan of these lectures is to develop a renormalisation technique that will allow us to derive transport equations for the kinetic limits of two classes of simple dynamical systems, the Lorentz gas and kicked Hamiltonians (or linked twist maps). The technique uses the ergodic theory of flows on homogeneous spaces (homogeneous flows for short), and is based on joint work with Andreas Str\\"ombergsson.
Ultrafast studies of solution dynamics
Woodruff, W.H.; Dyer, R.B. [Los Alamos National Lab., NM (United States); Callender, R.H. [City Univ. of New York, NY (United States). Dept. of Physics
1997-10-01T23:59:59.000Z
This is the final report of a one-year, Laboratory Directed Research and Development (LDRD) project at Los Alamos National Laboratory (LANL). Fast chemical dynamics generally must be initiated photochemically. This limits the applicability of modern laser methods for following the structural changes that occur during chemical and biological reactions to those systems that have an electronic chromophore that has a significant yield of photoproduct when excited. This project has developed a new and entirely general approach to ultrafast initiation of reactions in solution: laser-induced temperature jump (T-jump). The results open entire new fields of study of ultrafast molecular dynamics in solution. The authors have demonstrated the T-jump technique on time scales of 50 ps and longer, and have applied it to study of the fast events in protein folding. They find that a general lifetime of alpha-helix formation is ca 100 ns, and that tertiary folds (in apomyoglobin) form in ca 100 {mu}s.
Dynamics of the Galaxy's Satellites
James Binney
2000-06-28T23:59:59.000Z
The Milky Way's satellites provide unique information about the density of the Galactic halo at large radii. The inclusion of even a few rather inaccurate proper motions resolves an ambiguity in older mass estimates in favour of higher values. Many of the satellites are concentrated into streams. The dynamics of the Magellanic Stream provided an early indication that the halo reaches out to beyond 100 kpc. Tidal forces between the Clouds are currently disturbing the Clouds' internal dynamics. One would expect this damage to worsen rapidly as the tidal field of the MW excites the eccentricity of the Clouds' mutual orbit. This process, which has yet to be completely modelled, is important for understanding the degree of self-lensing in searches for gravitational lensing events. The Sagittarius Dwarf galaxy very likely contributes significantly to the Galactic warp. The direction of the warp's line of nodes is incorrectly predicted by the simplest models of the Dwarf's orbit. More sophisticated models, in which a complex distribution of stripped dark matter is predicted, may be more successful.
Dynamic Portfolio Optimization with Transaction Costs: Heuristics ...
2011-02-03T23:59:59.000Z
Aug 10, 2010 ... Dynamic Portfolio Optimization with Transaction. Costs: Heuristics and Dual Bounds. David B. Brown and James E. Smith?. Fuqua School of ...
Fractal diffusion coefficient from dynamical zeta functions
G. Cristadoro
2005-09-28T23:59:59.000Z
Dynamical zeta functions provide a powerful method to analyze low dimensional dynamical systems when the underlying symbolic dynamics is under control. On the other hand even simple one dimensional maps can show an intricate structure of the grammar rules that may lead to a non smooth dependence of global observable on parameters changes. A paradigmatic example is the fractal diffusion coefficient arising in a simple piecewise linear one dimensional map of the real line. Using the Baladi-Ruelle generalization of the Milnor-Thurnston kneading determinant we provide the exact dynamical zeta function for such a map and compute the diffusion coefficient from its smallest zero.
The Dynamics of Moonlighting in Pakistan
Hyder, Asma; Ahmed, Ather Maqsood
2011-01-01T23:59:59.000Z
of Sciences and Technology, Pakistan January 2011 10945 LeDynamics of Moonlighting in Pakistan Asma Hyder and Ather18 March, 2010 Islamabad, Pakistan Institute of Development
A Molecular Dynamics Investigation of Hydrolytic Polymerization...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Hydrolytic Polymerization in a Metal-Hydroxide Gel. A Molecular Dynamics Investigation of Hydrolytic Polymerization in a Metal-Hydroxide Gel. Abstract: The early stages of the...
Modal dynamics for positive operator measures
Jay Gambetta; H. M. Wiseman
2007-04-06T23:59:59.000Z
The modal interpretation of quantum mechanics allows one to keep the standard classical definition of realism intact. That is, variables have a definite status for all time and a measurement only tells us which value it had. However, at present modal dynamics are only applicable to situations that are described in the orthodox theory by projective measures. In this paper we extend modal dynamics to include positive operator measures (POMs). That is, for example, rather than using a complete set of orthogonal projectors, we can use an overcomplete set of nonorthogonal projectors. We derive the conditions under which Bell's stochastic modal dynamics for projective measures reduce to deterministic dynamics, showing (incidentally) that Brown and Hiley's generalization of Bohmian mechanics [quant-ph/0005026, (2000)] cannot be thus derived. We then show how {\\em deterministic} dynamics for positive operators can also be derived. As a simple case, we consider a Harmonic oscillator, and the overcomplete set of coherent state projectors (i.e. the Husimi POM). We show that the modal dynamics for this POM in the classical limit correspond to the classical dynamics, even for the nonclassical number state $\\ket{n}$. This is in contrast to the Bohmian dynamics, which for energy eigenstates, the dynamics are always non-classical.
The shape dynamics description of gravity
Tim Koslowski
2015-01-13T23:59:59.000Z
Classical gravity can be described as a relational dynamical system without ever appealing to spacetime or its geometry. This description is the so-called shape dynamics description of gravity. The existence of relational first principles from which the shape dynamics description of gravity can be derived is a motivation to consider shape dynamics (rather than GR) as the fundamental description of gravity. Adopting this point of view leads to the question: What is the role of spacetime in the shape dynamics description of gravity? This question contains many aspects: Compatibility of shape dynamics with the description of gravity in terms of spacetime geometry, the role of local Minkowski space, universality of spacetime geometry and the nature of quantum particles, which can no longer be assumed to be irreducible representations of the Poincare group. In this contribution I derive effective spacetime structures by considering how matter fluctuations evolve along with shape dynamics. This evolution reveals an "experienced spacetime geometry." This leads (in an idealized approximation) to local Minkowski space and causal relations. The small scale structure of the emergent geometric picture depends on the specific probes used to experience spacetime, which limits the applicability of effective spacetime to describe shape dynamics. I conclude with discussing the nature of quantum fluctuations (particles) in shape dynamics and how local Minkowski spacetime emerges from the evolution of quantum particles.
Shape Dynamics in 2+1 Dimensions
Timothy Budd; Tim Koslowski
2011-07-07T23:59:59.000Z
Shape Dynamics is a formulation of General Relativity where refoliation invariance is traded for local spatial conformal invariance. In this paper we explicitly construct Shape Dynamics for a torus universe in 2+1 dimensions through a linking gauge theory that ensures dynamical equivalence with General Relativity. The Hamiltonian we obtain is formally a reduced phase space Hamiltonian. The construction of the Shape Dynamics Hamiltonian on higher genus surfaces is not explicitly possible, but we give an explicit expansion of the Shape Dynamics Hamiltonian for large CMC volume. The fact that all local constraints are linear in momenta allows us to quantize these explicitly, and the quantization problem for Shape Dynamics turns out to be equivalent to reduced phase space quantization. We consider the large CMC-volume asymptotics of conformal transformations of the wave function. We then use the similarity of Shape Dynamics on the 2-torus with the explicitly constructible strong gravity (BKL) Shape Dynamics Hamiltonian in higher dimensions to suggest a quantization strategy for Shape Dynamics.
Zeno Dynamics for Open Quantum Systems
J. E. Gough
2014-04-09T23:59:59.000Z
In this paper we formulate limit Zeno dynamics of general open systems as the adiabatic elimination of fast components. We are able to exploit previous work on adiabatic elimination of quantum stochastic models to give explicitly the conditions under which open Zeno dynamics will exist. The open systems formulation is further developed as a framework for Zeno master equations, and Zeno filtering (that is, quantum trajectories based on a limit Zeno dynamical model). We discuss several models from the point of view of quantum control. For the case of linear quantum stochastic systems we present a condition for stability of the asymptotic Zeno dynamics.
Molecular dynamics simulation studies of electrolytes andelectrolyte...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
Merit Review and Peer Evaluation Meeting, May 18-22, 2009 -- Washington D.C. es40smith.pdf More Documents & Publications Molecular Dynamics Simulation Studies of...
Dynamic Network Utility Maximization with Delivery Contracts
Nikolaos Trichakis
2007-09-30T23:59:59.000Z
Sep 30, 2007 ... Dynamic Network Utility Maximization with Delivery Contracts. Nikolaos ... We briefly describe a heuristic, based on model predictive control, ...
Dynamic surface topography influences cell function
Kiang, Jennifer Deng
2012-01-01T23:59:59.000Z
A) Relative surface topography of hydrogel over a wire (B)oscillating surface topography on cell morphology. In FigureSAN DIEGO Dynamic Surface Topography Influences Cell
Navigating the complexities of dynamic ecosystem change
Rhodes, Jonathan R.
2013-01-01T23:59:59.000Z
Navigating the complexities of dynamic ecosystem change Novel Ecosystems: Intervening in the New Ecological World www.wiley.com The world’s ecosystems have always been
Optimization Online - Dynamic Generation of Scenario Trees
G. Ch. Pflug
2014-09-03T23:59:59.000Z
Sep 3, 2014 ... Abstract: We present new algorithms for the dynamic generation of scenario trees for multistage stochastic optimization. The different methods ...
Molecular dynamics simulation of threshold displacement energies...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
experimental estimates in ceramics. Citation: Moreira PA, R Devanathan, J Yu, and WJ Weber.2009."Molecular dynamics simulation of threshold displacement energies in...
A Dynamic Platform for Runtime Adaptation
Pham, Hubert
We present a middleware platform for assembling pervasive applications that demand fault-tolerance and adaptivity in distributed, dynamic environments. Unlike typical adaptive middleware approaches, in which sophisticated ...
Event-driven multithreaded dynamic optimization
Zhang, Weifeng
2006-01-01T23:59:59.000Z
percent dynamic loads Hits-prefetched Partial-prefetchedlead to partial prefetching. That is, the load la- tency ispartial monitoring window. After all of the delinquent loads
Electronic Relaxation Dynamics in Coupled Metal Nanoparticles
Scherer, Norbert F.
of hot electrons for photoelectrochemical processes, including solar energy conversion or organic wasteElectronic Relaxation Dynamics in Coupled Metal Nanoparticles Mark J. Feldstein, Christine D
COLLOQUIUM: Controlling Quantum Dynamics | Princeton Plasma Physics...
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Controlling Quantum Dynamics Professor Herschel Rabitz Princeton University Contact Information Coordinator(s): Miss Carol Ann Au caustin@pppl.gov Host(s): Dr. Elena Belova ebelova...
Dynamic coupling drives conformational evolution of branched...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Materials Characterization Dynamic coupling drives conformational evolution of branched polymers in solutions March 06, 2015 Inter-particle collision time (filled circles) and...
Quantitative Modeling of High Temperature Magnetization Dynamics
Zhang, Shufeng
2009-03-01T23:59:59.000Z
Final Technical Report Project title: Quantitative Modeling of High Temperature Magnetization Dynamics DOE/Office of Science Program Manager Contact: Dr. James Davenport
Dynamically orthogonal field equations for stochastic fluid flows and particle dynamics
Sapsis, Themistoklis P
2011-01-01T23:59:59.000Z
In the past decades an increasing number of problems in continuum theory have been treated using stochastic dynamical theories. This is because dynamical systems governing real processes always contain some elements ...
Some Mathematical and Numerical Issues in Geophysical Fluid Dynamics and Climate Dynamics
Jianping Li; Shouhong Wang
2007-11-12T23:59:59.000Z
In this article, we address both recent advances and open questions in some mathematical and computational issues in geophysical fluid dynamics (GFD) and climate dynamics. The main focus is on 1) the primitive equations (PEs) models and their related mathematical and computational issues, 2) climate variability, predictability and successive bifurcation, and 3) a new dynamical systems theory and its applications to GFD and climate dynamics.
BEAM DYNAMICS IN NS-FFAG EMMAWITH DYNAMICAL MAPS
Giboudot, Y; Edgecock, R; Wolski, A
2010-01-01T23:59:59.000Z
The Non Scaling Fixed Field Alternating Gradient EMMA has a compact linear lattice. Effect of Fringe Field on the beam has to be studied carefully. A numerical magnetic field map is generated by magnet measurements or magnet design softwares. We developed a technique that produces from the numerical field map, a dynamical map for a particle travelling in the entire EMMA cell for a reference energy without acceleration. Since the beam dynamics change with energy, a set of maps have been produce with different reference energies between 10 and 20MeV. For each reference energy, simulated tune and time of flight (TOF) have been compared with results in Zgoubi - tracking directly through numerical field map. The range of validity of a single map has been investigated by tracking particle with large energy deviation. From that, a ...
Dynamic Positioning System as Dynamic Energy Storage on Diesel-Electric Ships
Johansen, Tor Arne
1 Dynamic Positioning System as Dynamic Energy Storage on Diesel-Electric Ships Tor A. Johansen in order to implement energy storage in the kinetic and potential energy of the ship motion using the DP in order to relate the dynamic energy storage capacity to the maximum allowed ship position deviation
Wichmann, Felix
Abschlußbericht Mixed Signal Baugruppen 2006/7 Gitarrenverstärker WILDCAT Dynamic Compressor Seite 7-1 Der WILDCAT Dynamic Compressor Von René Fischer, Stefan Straube und Henry Westphal #12;Abschlußbericht Mixed Signal Baugruppen 2006/7 Gitarrenverstärker WILDCAT Dynamic Compressor Seite 7-2 Die Idee
Albert, Réka
with a random network with a given degree distribution P(k). Mark edges with probability T. DisregardThe two faces of network dynamics Evolving network models describe the dynamics (assembly, evolution) OF networks by the addition/removal of nodes and edges. It is possible to have network dynamics
Fayer, Michael D.
Phenol-benzene complexation dynamics: Quantum chemistry calculation, molecular dynamics simulations the nature and dynamics of the phenol-benzene complex in the mixed solvent, benzene/CCl4. Under thermal used for the phenol-benzene interaction in the MD simulations is in good accord with the highest level
Fayer, Michael D.
Myoglobin-CO Substate Structures and Dynamics: Multidimensional Vibrational Echoes and Molecular to establishing the relationships between protein structure and protein function.1-5 Protein dynamics occur structural specificity to assign these dynamics to particular atomic motions. Computational tech- niques
Plasticity of metal wires in torsion: Molecular dynamics and dislocation dynamics simulations
Cai, Wei
Plasticity of metal wires in torsion: Molecular dynamics and dislocation dynamics simulations t The orientation dependent plasticity in metal nanowires is investigated using molecular dynamics and dislocation wires controls the mechanisms of plastic deformation. For wires oriented along /1 1 0S, dislocations
September 11, 2008 12:55 Dynamical Systems monotonereacs Dynamical Systems
Banaji,. Murad
September 11, 2008 12:55 Dynamical Systems monotonereacs Dynamical Systems Vol. 00, No. 00, Month 200x, 1Â30 RESEARCH ARTICLE Monotonicity in chemical reaction systems Murad Banajia, a Department) This paper discusses the question of when the dynamical systems arising from chemical reac- tion networks
Dynamical Friction on extended perturbers
O. Esquivel; B. Fuchs
2008-04-01T23:59:59.000Z
Following a wave-mechanical treatment we calculate the drag force exerted by an infinite homogeneous background of stars on a perturber as this makes its way through the system. We recover Chandrasekhar's classical dynamical friction (DF) law with a modified Coulomb logarithm. We take into account a range of models that encompasses all plausible density distributions for satellite galaxies by considering the DF exerted on a Plummer sphere and a perturber having a Hernquist profile. It is shown that the shape of the perturber affects only the exact form of the Coulomb logarithm. The latter converges on small scales, because encounters of the test and field stars with impact parameters less than the size of the massive perturber become inefficient. We confirm this way earlier results based on the impulse approximation of small angle scatterings.
Elemer E Rosinger
2010-04-09T23:59:59.000Z
What makes sets, or more precisely, the category {\\bf Set} important in Mathematics are the well known {\\it two} specific ways in which arbitrary mappings $f : X \\longrightarrow Y$ between any two sets $X, Y$ can {\\it fail} to be bijections. Namely, they can fail to be injective, and/or to be surjective. As for bijective mappings they are rather trivial, since with some relabeling of their domains or ranges, they simply become permutations, or even identity mappings. \\\\ To the above, one may add the {\\it third} property of sets, namely that, between any two nonvoid sets there exist mappings. \\\\ These three properties turn out to be at the root of much of the interest which the category {\\bf Set} has in Mathematics. Specifically, these properties create a certain {\\it dynamics}, or for that matter, lack of it, on the level of the category {\\bf Set} and of some of its subcategories.
Coherent control of plasma dynamics
He, Z -H; Lebailly, V; Nees, J A; Krushelnick, K; Thomas, A G R
2015-01-01T23:59:59.000Z
Coherent control of a system involves steering an interaction to a final coherent state by controlling the phase of an applied field. Plasmas support coherent wave structures that can be generated by intense laser fields. Here, we demonstrate the coherent control of plasma dynamics in a laser wakefield electron acceleration experiment. A genetic algorithm is implemented using a deformable mirror with the electron beam signal as feedback, which allows a heuristic search for the optimal wavefront under laser-plasma conditions that is not known a priori. We are able to improve both the electron beam charge and angular distribution by an order of magnitude. These improvements do not simply correlate with having the `best' focal spot, since the highest quality vacuum focal spot produces a greatly inferior electron beam, but instead correspond to the particular laser phase that steers the plasma wave to a final state with optimal accelerating fields.
Dynamical transitions of turing patterns.
Kaper, H. G.; Wang, S.; Yari, M.; Mathematics and Computer Science; Indiana Univ.
2009-01-01T23:59:59.000Z
This paper is concerned with the formation and persistence of spatiotemporal patterns in binary mixtures of chemically reacting species, where one of the species is an activator, the other an inhibitor of the chemical reaction. The system of reaction-diffusion equations is reduced to a finite system of ordinary differential equations by a variant of the centre-manifold reduction method. The reduced system fully describes the local dynamics of the original system near transition points at the onset of instability. The attractor-bifurcation theory is used to give a complete characterization of the bifurcated objects in terms of the physical parameters of the problem. The results are illustrated for the Schnakenberg model.
Dynamical failure of Turing patterns
Alon Manor; Nadav M. Shnerb
2006-05-21T23:59:59.000Z
The emergence of stable disordered patterns in reactive system on spatially homogenous substrate is studied in the context of vegetation patterns in the semi-arid climatic zone. It is shown that reaction-diffusion systems that allow for Turing instability may exhibit heterogeneous "glassy" steady state, with no characteristic wavelength, if the diffusion rate associated with the "slow" reactant is very small. Upon decreasing the diffusion constant of the slow reactant three phases are identified: strong diffusion yields a stable homogenous phase, intermediate diffusion implies Turing (crystal like) patterns while in the slow diffusion limit the glassy state is the generic stable solution. In this disordered phase the dynamics is of crucial importance, with strong differences between local and global initiation.
Rubber friction and tire dynamics
B. N. J. Persson
2010-07-16T23:59:59.000Z
We propose a simple rubber friction law, which can be used, e.g., in models of tire (and vehicle) dynamics. The friction law is tested by comparing numerical results to the full rubber friction theory (B.N.J. Persson, J. Phys.: Condensed Matter 18, 7789 (2006)). Good agreement is found between the two theories. We describe a two-dimensional (2D) tire model which combines the rubber friction model with a simple mass-spring description of the tire body. The tire model is very flexible and can be used to calculate accurate mu-slip (and the self-aligning torque) curves for braking and cornering or combined motion (e.g., braking during cornering). We present numerical results which illustrate the theory. Simulations of Anti-Blocking System (ABS) braking are performed using two simple control algorithms.
Optimal prediction in molecular dynamics
Benjamin Seibold
2008-08-22T23:59:59.000Z
Optimal prediction approximates the average solution of a large system of ordinary differential equations by a smaller system. We present how optimal prediction can be applied to a typical problem in the field of molecular dynamics, in order to reduce the number of particles to be tracked in the computations. We consider a model problem, which describes a surface coating process, and show how asymptotic methods can be employed to approximate the high dimensional conditional expectations, which arise in optimal prediction. The thus derived smaller system is compared to the original system in terms of statistical quantities, such as diffusion constants. The comparison is carried out by Monte-Carlo simulations, and it is shown under which conditions optimal prediction yields a valid approximation to the original system.
Combustion fume structure and dynamics
Flagan, R.C.
1992-08-01T23:59:59.000Z
The focus of this research program is on elucidating the fundamental processes that determine the particle size distribution, composition, and agglomerate structures of coal ash fumes. The ultimate objective of this work is the development and validation of a model for the dynamics of combustion fumes, describing both the evolution of the particle size distribution and the particle morphology. The study employs model systems to address the fundamental questions and to provide rigorous validation of the models to be developed. This first phase of the project has been devoted to the development of a detailed experimental strategy that will allow agglomerates with a broad range of fractal dimensions to be studied in the laboratory. (VC)
Dynamics of assembly production flow
Ezaki, Takahiro; Nishinari, Katsuhiro
2015-01-01T23:59:59.000Z
Despite recent developments in management theory, maintaining a manufacturing schedule remains difficult because of production delays and fluctuations in demand and supply of materials. The response of manufacturing systems to such disruptions to dynamic behavior has been rarely studied. To capture these responses, we investigate a process that models the assembly of parts into end products. The complete assembly process is represented by a directed tree, where the smallest parts are injected at leaves and the end products are removed at the root. A discrete assembly process, represented by a node on the network, integrates parts, which are then sent to the next downstream node as a single part. The model exhibits some intriguing phenomena, including overstock cascade, phase transition in terms of demand and supply fluctuations, nonmonotonic distribution of stockout in the network, and the formation of a stockout path and stockout chains. Surprisingly, these rich phenomena result from only the nature of distr...
Dynamic Testing of Gasifier Refractory
Michael D. Mann; John P. Hurley
2002-09-27T23:59:59.000Z
As DOE continues to advance new power systems, materials issues are often pivotal in determining the ultimate efficiency that can be reached in the system. Refractory performance in slagging gasification represents one of these issues. The University of North Dakota (UND) Chemical Engineering Department in conjunction with the UND Energy & Environmental Research Center (EERC) have initiated a program to thoroughly examine the combined chemical (reaction and phase change) and physical (erosion) effects experienced by a variety of refractory materials during both normal operation and thermal cycling under slagging coal gasification conditions. The goal of this work is to devise a mechanism of refractory loss under these conditions. The focus of the proposed work is to test the corrosion resistance of commercially available refractories to flowing coal slag, and propose the mechanisms of corrosion for the conditions studied. Corrosion is the degradation of material surfaces or grain boundaries by chemical reactions with melts, liquids, or gases, causing loss of material and consequently a decrease in strength of the structure. In order to develop methods of reducing corrosion, the microstructure that is attacked must be identified along with the mechanism and rates of attack. Once these are identified, methods for reducing corrosion rates can be developed. The work will take advantage of equipment and experimental techniques developed at the EERC under funding from several DOE programs. The controlled-atmospheric dynamic corrodent application furnace (CADCAF) will be utilized to simulate refractory/slag interactions under dynamic conditions that more realistically simulate the environment in a slagging coal gasifier than any of the static tests used previously by refractory manufacturers and researchers. To date, efforts have focused on final shakedown of the CADCAF and obtaining representative samples of slag and refractory for testing.
EXPERIMENTAL VERIFICATION OF DYNAMIC OPERATION OF
Skogestad, Sigurd
- ponent mixtures can be separated into a number of product fractions, whereas in continuous distillationEXPERIMENTAL VERIFICATION OF DYNAMIC OPERATION OF CONTINUOUS AND MULTIVESSEL BATCH DISTILLATION to the paper "Evaluation of Dynamic Models of Distillation Columns with Emphasis on the Initial Response
Environmental Regulation and Industry Dynamics Aditi Sengupta
Edwards, Paul N.
on the dynamic struc- ture of a deterministic competitive industry with endogenous entry and exit where ...rms, pro- duction scale, investment behavior, as well as entry and exit decisions of ...rms. One signi such investments, in turn, a¤ect the entry and exit decisions of ...rms and more generally, the dynamic structure
OPTIMAL CONTROL WITH ADAPTIVE INTERNAL DYNAMICS MODELS
Vijayakumar, Sethu
. The optimal feedback control law for systems with non-linear dynamics and non-quadratic costs can be foundOPTIMAL CONTROL WITH ADAPTIVE INTERNAL DYNAMICS MODELS Djordje Mitrovic, Stefan Klanke, and Sethu, optimal control, adaptive control, robot simulation Abstract: Optimal feedback control has been proposed
WebGL for Dynamic Virtual Globes
Plotkin, Joshua B.
WebGL for Dynamic Virtual Globes Patrick Cozzi Analytical Graphics, Inc. pcozzi@agi.com @pjcozzi #12;No anisotropic filtering Overview Cesium A WebGL virtual globe for visualizing dynamic data-side #12;Cesium Architecture - Renderer Scene Renderer Core Renderer - a thin abstraction over Web
DYNAMIC RISK MANAGEMENT IN ELECTRICITY PORTFOLIO OPTIMIZATION
Eichhorn, Andreas
DYNAMIC RISK MANAGEMENT IN ELECTRICITY PORTFOLIO OPTIMIZATION VIA POLYHEDRAL RISK FUNCTIONALS the dynamic decision structure appropriately. In energy risk management, which is typically carried out ex, for integrating risk management into a stochastic optimization framework, risk has to be quantified in a definite
Thwarted dynamics by partial projective measurements
Bruno Bellomo; Giuseppe Compagno; Hiromichi Nakazato; Kazuya Yuasa
2009-09-19T23:59:59.000Z
The dynamics of a system, made of a particle interacting with a field mode, thwarted by the action of repeated projective measurements on the particle, is examined. The effect of the partial measurements is discussed by comparing it with the dynamics in the absence of the measurements.
Dynamics of Bose-Einstein Condensates
Benjamin Schlein
2007-04-05T23:59:59.000Z
We report on some recent results concerning the dynamics of Bose-Einstein condensates, obtained in a series of joint papers with L. Erdos and H.-T. Yau. Starting from many body quantum dynamics, we present a rigorous derivation of a cubic nonlinear Schroedinger equation known as the Gross-Pitaevskii equation for the time evolution of the condensate wave function.
Brain dynamics promotes function Carlos Lourenco
Lisboa, Universidade Técnica de
Brain dynamics promotes function Carlos Louren¸co 1 Faculty of Sciences of the University of Lisbon, 1049-001 Lisboa - Portugal Abstract. Dynamical structure in the brain promotes biological func- tion. Computational scientists have new opportunities to receive 'algorithmic' inspiration from brain processes
Dynamic Correlation Length Scales under Isochronal Conditions
R. Casalini; D. Fragiadakis; C. M. Roland
2014-11-24T23:59:59.000Z
The origin of the dramatic changes in the behavior of liquids as they approach their vitreous state - increases of many orders of magnitude in transport properties and dynamic time scales - is a major unsolved problem in condensed matter. These changes are accompanied by greater dynamic heterogeneity, which refers to both spatial variation and spatial correlation of molecular mobilities. The question is whether the changing dynamics is coupled to this heterogeneity; that is, does the latter cause the former? To address this we carried out the first nonlinear dielectric experiments at elevated hydrostatic pressures on two liquids, to measure the third-order harmonic component of their susceptibilities. We extract from this the number of dynamically correlated molecules for various state points, and find that the dynamic correlation volume for non-associated liquids depends primarily on the relaxation time, sensibly independent of temperature and pressure. We support this result by molecular dynamic simulations showing that the maximum in the four-point dynamic susceptibility of density fluctuations varies less than 10% for molecules that do not form hydrogen bonds. Our findings are consistent with dynamic heterogeneity serving as the principal control parameter for the slowing down of molecular motions in supercooled materials.
Dynamic defense workshop : from research to practice.
Crosby, Sean Michael; Doak, Justin E.; Haas, Jason J.; Helinski, Ryan; Lamb, Christopher C.
2013-02-01T23:59:59.000Z
On September 5th and 6th, 2012, the Dynamic Defense Workshop: From Research to Practice brought together researchers from academia, industry, and Sandia with the goals of increasing collaboration between Sandia National Laboratories and external organizations, de ning and un- derstanding dynamic, or moving target, defense concepts and directions, and gaining a greater understanding of the state of the art for dynamic defense. Through the workshop, we broadened and re ned our de nition and understanding, identi ed new approaches to inherent challenges, and de ned principles of dynamic defense. Half of the workshop was devoted to presentations of current state-of-the-art work. Presentation topics included areas such as the failure of current defenses, threats, techniques, goals of dynamic defense, theory, foundations of dynamic defense, future directions and open research questions related to dynamic defense. The remainder of the workshop was discussion, which was broken down into sessions on de ning challenges, applications to host or mobile environments, applications to enterprise network environments, exploring research and operational taxonomies, and determining how to apply scienti c rigor to and investigating the eld of dynamic defense.
Modelling and Dynamic Simulation for Process Control
Skogestad, Sigurd
principles for model development are outlined, and these principles are applied to a simple ash tank (which. In this paper we consider dynamic process models obtained using fundamental principles (eg. based reactor, a simple trend analysis using temperature measurements may be suÆcient. Dynamic models
Solar Dynamics, Rotation, Convection and Overshoot
Hanasoge, S; Roth, M; Schou, J; Schuessler, M; Thompson, M J
2015-01-01T23:59:59.000Z
We discuss recent observational, theoretical and modeling progress made in understanding the Sun's internal dynamics, including its rotation, meridional flow, convection and overshoot. Over the past few decades, substantial theoretical and observational effort has gone into appreciating these aspects of solar dynamics. A review of these observations, related helioseismic methodology and inference and computational results in relation to these problems is undertaken here.
The ideal energy of classical lattice dynamics
Margolus, Norman
2015-01-01T23:59:59.000Z
We define, as local quantities, the least energy and momentum allowed by quantum mechanics and special relativity for physical realizations of some classical lattice dynamics. These definitions depend on local rates of finite-state change. In two example dynamics, we see that these rates evolve like classical mechanical energy and momentum.
Roadmapbased Motion Planning in Dynamic Environments
Utrecht, Universiteit
Roadmapbased Motion Planning in Dynamic Environments Jur P. van den Berg Mark H. Overmars.cs.uu.nl #12; Roadmapbased Motion Planning in Dynamic Environments Jur P. van den Berg Mark H. Overmars April obstacles. We propose a practical algorithm based on a roadmap that is created for the static part
Idealized Test Cases for Dynamical Core Experiments
Jablonowski, Christiane
Idealized Test Cases for Dynamical Core Experiments Christiane Jablonowski (University of Michigan-13/2006 #12;Motivation · Test cases for 3D dynamical cores on the sphere are hard to find in the literature groups lack standardized & easy-to-use analysis techniques · Idea: Establish a collection of test cases
Dynamic Power Management for Nonstationary Service Requests
De Micheli, Giovanni
Dynamic Power Management for Nonstationary Service Requests Eui-Young Chung, Luca Benini, Alessandro Bogliolo, Yung-Hsiang Lu, and Giovanni De Micheli, Fellow, IEEE Abstract--Dynamic Power Management selective shutdown of idle system resources. The effectiveness of a power management scheme depends
Dynamics and Bifurcations on a Circle
Beer, Randall D.
Dynamics and Bifurcations on a Circle Reading: Chapter 4 #12;IU/COGS-Q580/Beer A Dynamical System;IU/COGS-Q580/Beer Uniform Oscillator (identify) f ( ) f ( ) } Flow Vector Field t( ) =0 +t mod2( ) T = 2 ! = f ;( ) = #12;IU/COGS-Q580/Beer Nonuniform Oscillator ! = f ;,a( ) = - asin (Assume > 0
DYNAMIC WORKCELL FOR INDUSTRIAL ROBOTS A Dissertation
Hoover, Adam
DYNAMIC WORKCELL FOR INDUSTRIAL ROBOTS A Dissertation Presented to the Graduate School of Clemson: This dissertation entitled "Dynamic Workcell for Industrial Robots" and written by Yanfei Liu is presented present a novel approach to workcell design for enhanced per- formance of industrial robot manipulators
Distributed Termination Detection for Dynamic Systems
Dhamdhere, Dhananjay Madhav
Distributed Termination Detection for Dynamic Systems D. M. Dhamdhere \\Lambda Sridhar R. Iyer E for detecting the termination of a disÂ tributed computation is presented. The algorithm does not require global are provided. Keywords Distributed algorithms, Distributed computation, Distributed termination, Dynamic
Planar Multicontact Locomotion Using Hybrid Zero Dynamics
Lack, Jordan Thomas
2013-11-26T23:59:59.000Z
the dynamics during the impacts are modeled assuming perfectly plastic impacts in which the ground imparts an impulsive force on the impacting link. Using the dynamic model of the planar bipedal robot Amber 2, a seven link biped, a human-inspired optimization...
Distributed Compressed Sensing in Dynamic Networks
Eldar, Yonina
Distributed Compressed Sensing in Dynamic Networks Stacy Patterson Department of Computer Science theoretical results to develop a distributed version of IHT for dynamic networks. Evaluations show that our throughout the network, it is desirable to perform this recovery within the network in a distributed fashion
Carbon and Nitrogen Dynamics in Agricultural Soils
Carbon and Nitrogen Dynamics in Agricultural Soils Model Applications at Different Scales in Time Print: SLU Service/Repro, Uppsala 2012 #12;Carbon and Nitrogen Dynamics in Agricultural Soils. Model Applications at Different Scales in Time and Space Abstract An understanding of soil organic carbon (C
Field Theory Approaches to Nonequilibrium Dynamics
Täuber, Uwe Claus
0435, USA email: tauber@vt.edu Financial support: National Science Foundation, Division of Materials September 2005 i #12; Lecture I: Critical dynamics 1. Introduction: critical slowing down 2. Field theory, critical exponents 5. Critical dynamics with reversible modecouplings 6. Critical relaxation, initial slip
Engineering mesoscale structures with distinct dynamical implications
Engineering mesoscale structures with distinct dynamical implications Anne-Ly Do1 , Johannes H that there are certain mesoscale subgraphs that have precise and distinct consequences for the system-level dynamics. In particular, if mesoscale symmetries are present then eigenvectors of the Jacobian localise on the symmetric
World-Systems as Dynamic Networks
White, Douglas R.
World-Systems as Dynamic Networks Christopher Chase-Dunn Institute for Research on World-Systems on comparative world-systems for the workshop on `analyzing complex macrosystems as dynamic networks" at the Santa Fe Institute, April 29- 30, 2004. (8341 words) v. 4-22-04 1 #12;The comparative world-systems
Collective dynamics of active cytoskeletal networks
Simone Köhler; Volker Schaller; Andreas R. Bausch
2011-05-23T23:59:59.000Z
Self organization mechanisms are essential for the cytoskeleton to adapt to the requirements of living cells. They rely on the intricate interplay of cytoskeletal filaments, crosslinking proteins and molecular motors. Here we present an in vitro minimal model system consisting of actin filaments, fascin and myosin-II filaments exhibiting pulsative collective long range dynamics. The reorganizations in the highly dynamic steady state of the active gel are characterized by alternating periods of runs and stalls resulting in a superdiffusive dynamics of the network's constituents. They are dominated by the complex competition of crosslinking molecules and motor filaments in the network: Collective dynamics are only observed if the relative strength of the binding of myosin-II filaments to the actin network allows exerting high enough forces to unbind actin/fascin crosslinks. The feedback between structure formation and dynamics can be resolved by combining these experiments with phenomenological simulations based on simple interaction rules.
Dynamics of Gas-Fluidized Granular Rods
L. J. Daniels; Y. Park; T. C. Lubensky; D. J. Durian
2008-11-17T23:59:59.000Z
We study a quasi-two-dimensional monolayer of granular rods fluidized by a spatially and temporally homogeneous upflow of air. By tracking the position and orientation of the particles, we characterize the dynamics of the system with sufficient resolution to observe ballistic motion at the shortest time scales. Particle anisotropy gives rise to dynamical anisotropy and superdiffusive dynamics parallel to the rod's long axis, causing the parallel and perpendicular mean squared displacements to become diffusive on different timescales. The distributions of free times and free paths between collisions deviate from exponential behavior, underscoring the non-thermal character of the particle motion. The dynamics show evidence of rotational-translational coupling similar to that of an anisotropic Brownian particle. We model rotational-translation coupling in the single-particle dynamics with a modified Langevin model using non-thermal noise sources. This suggests a phenomenological approach to thinking about collections of self-propelling particles in terms of enhanced memory effects.
Implementing Turing Machines in Dynamic Field Architectures
Graben, Peter beim
2012-01-01T23:59:59.000Z
Cognitive computation such as e.g. language processing, is conventionally regarded as Turing computation, and Turing machines can be uniquely implemented as nonlinear dynamical systems using generalized shifts and subsequent G\\"odel encoding of the symbolic repertoire. The resulting nonlinear dynamical automata (NDA) are piecewise affine-linear maps acting on the unit square that is partitioned into rectangular domains. Iterating a single point, i.e. a microstate, by the dynamics yields a trajectory of, in principle, infinitely many points scattered through phase space. Therefore, the NDAs microstate dynamics does not necessarily terminate in contrast to its counterpart, the symbolic dynamics obtained from the rectangular partition. In order to regain the proper symbolic interpretation, one has to prepare ensembles of randomly distributed microstates with rectangular supports. Only the resulting macrostate evolution corresponds then to the original Turing machine computation. However, the introduction of rand...
The structure of tame minimal dynamical systems
Eli Glasner
2006-09-18T23:59:59.000Z
A dynamical version of the Bourgain-Fremlin-Talagrand dichotomy shows that the enveloping semigroup of a dynamical system is either very large and contains a topological copy of $\\beta \\N$, or it is a "tame" topological space whose topology is determined by the convergence of sequences. In the latter case the dynamical system is called tame. We use the structure theory of minimal dynamical systems to show that, when the acting group is Abelian, a tame metric minimal dynamical system (i) is almost automorphic (i.e. it is an almost 1-1 extension of an equicontinuous system), and (ii) admits a unique invariant probability measure such that the corresponding measure preserving system is measure theoretically isomorphic to the Haar measure system on the maximal equicontinuous factor.
Zhou, Ning; Huang, Zhenyu; Meng, Da; Elbert, Stephen T.; Wang, Shaobu; Diao, Ruisheng
2014-03-31T23:59:59.000Z
With the increasing complexity resulting from uncertainties and stochastic variations introduced by intermittent renewable energy sources, responsive loads, mobile consumption of plug-in vehicles, and new market designs, more and more dynamic behaviors are observed in everyday power system operation. To operate a power system efficiently and reliably, it is critical to adopt a dynamic paradigm so that effective control actions can be taken in time. The dynamic paradigm needs to include three fundamental components: dynamic state estimation; look-ahead dynamic simulation; and dynamic contingency analysis (Figure 1). These three components answer three basic questions: where the system is; where the system is going; and how secure the system is against accidents. The dynamic state estimation provides a solid cornerstone to support the other 2 components and is the focus of this study.
Aerospace & Energetics Research Program -University of Washington Plasma Dynamics Group
Shumlak, Uri
- University of Washington Plasma Dynamics Group q The Boltzmann equation is seven dimensional. qAerospace & Energetics Research Program - University of Washington Plasma Dynamics Group Plasma Research Program - University of Washington Plasma Dynamics Group Abstract Many current plasma simulation
Dynamics of galaxy cores and supermassive black holes
David Merritt
2006-05-02T23:59:59.000Z
Recent work on the dynamical evolution of galactic nuclei containing supermassive black holes is reviewed. Topics include galaxy structural properties; collisionless and collisional equilibria; loss-cone dynamics; and dynamics of binary and multiple supermassive black holes.
Preface to Structure and Dynamics:1#3
Manlove, Robert F.; Garfias, Robert; Colby, Benjamin N.; Bell, Duran
2005-01-01T23:59:59.000Z
As editors of Structure and Dynamics, we now establish adissertation in Structure and Dynamics as a separate numberin this issue of Structure and Dynamics, Camille Roth’s Co-
Evolutionary dynamics in set structured populations Corina E. Tarnitaa
Nowak, Martin A.
Evolutionary dynamics in set structured populations Corina E. Tarnitaa , Tibor Antala , Hisashi a powerful method to study dynamical population structure: evolutionary set theory. The individuals of popu- lation structure on evolutionary and ecological dynamics. These approaches include spatial models
Dynamics of excess electrons in atomic and molecular clusters
Young, Ryan Michael
2011-01-01T23:59:59.000Z
Time-Resolved Dynamics in Acetonitrile Cluster Anions (CH 3Time-resolved dynamics in acetonitrile clusters anions (CH 3resolved dynamics in acetonitrile clusters anions (CH 3 CN)
Berger, Thomas E.; Slater, Gregory; Hurlburt, Neal; Shine, Richard; Tarbell, Theodore; Title, Alan [Lockheed Martin Solar and Astrophysics Laboratory, B/252, 3251 Hanover Street, Palo Alto, CA 94304 (United States); Lites, Bruce W. [High Altitude Observatory, University Center for Atmospheric Research, Boulder, CO (United States); Okamoto, Takenori J.; Ichimoto, Kiyoshi; Katsukawa, Yukio; Magara, Tetsuya; Suematsu, Yoshinori [National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588 (Japan); Shimizu, Toshifumi, E-mail: berger@lmsal.co [Institute of Space and Astronautical Science/Japan Aerospace Exploration Agency, Sagamihara, Kanagawa 229-8510 (Japan)
2010-06-20T23:59:59.000Z
Hinode/Solar Optical Telescope (SOT) observations reveal two new dynamic modes in quiescent solar prominences: large-scale (20-50 Mm) 'arches' or 'bubbles' that 'inflate' from below into prominences, and smaller-scale (2-6 Mm) dark turbulent upflows. These novel dynamics are related in that they are always dark in visible-light spectral bands, they rise through the bright prominence emission with approximately constant speeds, and the small-scale upflows are sometimes observed to emanate from the top of the larger bubbles. Here we present detailed kinematic measurements of the small-scale turbulent upflows seen in several prominences in the SOT database. The dark upflows typically initiate vertically from 5 to 10 Mm wide dark cavities between the bottom of the prominence and the top of the chromospheric spicule layer. Small perturbations on the order of 1 Mm or less in size grow on the upper boundaries of cavities to generate plumes up to 4-6 Mm across at their largest widths. All plumes develop highly turbulent profiles, including occasional Kelvin-Helmholtz vortex 'roll-up' of the leading edge. The flows typically rise 10-15 Mm before decelerating to equilibrium. We measure the flowfield characteristics with a manual tracing method and with the Nonlinear Affine Velocity Estimator (NAVE) 'optical flow' code to derive velocity, acceleration, lifetime, and height data for several representative plumes. Maximum initial speeds are in the range of 20-30 km s{sup -1}, which is supersonic for a {approx}10,000 K plasma. The plumes decelerate in the final few Mm of their trajectories resulting in mean ascent speeds of 13-17 km s{sup -1}. Typical lifetimes range from 300 to 1000 s ({approx}5-15 minutes). The area growth rate of the plumes (observed as two-dimensional objects in the plane of the sky) is initially linear and ranges from 20,000 to 30,000 km{sup 2} s{sup -1} reaching maximum projected areas from 2 to 15 Mm{sup 2}. Maximum contrast of the dark flows relative to the bright prominence plasma in SOT images is negative and ranges from -10% for smaller flows to -50% for larger flows. Passive scalar 'cork movies' derived from NAVE measurements show that prominence plasma is entrained by the upflows, helping to counter the ubiquitous downflow streams in the prominence. Plume formation shows no clear temporal periodicity. However, it is common to find 'active cavities' beneath prominences that can spawn many upflows in succession before going dormant. The mean flow recurrence time in these active locations is roughly 300-500 s (5-8 minutes). Locations remain active on timescales of tens of minutes up to several hours. Using a column density ratio measurement and reasonable assumptions on plume and prominence geometries, we estimate that the mass density in the dark cavities is at most 20% of the visible prominence density, implying that a single large plume could supply up to 1% of the mass of a typical quiescent prominence. We hypothesize that the plumes are generated from a Rayleigh-Taylor instability taking place on the boundary between the buoyant cavities and the overlying prominence. Characteristics, such as plume size and frequency, may be modulated by the strength and direction of the cavity magnetic field relative to the prominence magnetic field. We conclude that buoyant plumes are a source of quiescent prominence mass as well as a mechanism by which prominence plasma is advected upward, countering constant gravitational drainage.
A Dynamic Traveling Salesman Problem with Stochastic Arc Costs
Alejandro Toriello
2012-08-31T23:59:59.000Z
Aug 31, 2012 ... Abstract: We propose a dynamic traveling salesman problem (TSP) with stochastic arc costs motivated by applications, such as dynamic ...
General Dynamics and Nissan Case Studies Highlight Benefits of...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
General Dynamics and Nissan Case Studies Highlight Benefits of Superior Energy Performance General Dynamics and Nissan Case Studies Highlight Benefits of Superior Energy...
ITP Chemicals: Technology Roadmap for Computational Fluid Dynamics...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
Fluid Dynamics, January 1999 ITP Chemicals: Technology Roadmap for Computational Fluid Dynamics, January 1999 cfdroadmap.pdf More Documents & Publications A Workshop to Identify...
Efficient and Dynamic ? The BMW Group Roadmap for the Application...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
and Dynamic The BMW Group Roadmap for the Application of Thermoelectric Generators Efficient and Dynamic The BMW Group Roadmap for the Application of Thermoelectric...
advanced dynamic neutron: Topics by E-print Network
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M. Ali Alpar 2005-05-04 11 THE JOURNAL OF CHEMICAL PHYSICS 139, 175101 (2013) Dynamic neutron scattering from conformational dynamics. I. Theory Biology and Medicine Websites...
Molecular dynamics simulation and ab intio studies of electrolytes...
Broader source: Energy.gov (indexed) [DOE]
Molecular dynamics simulation and ab intio studies of electrolytes and electrolyteelectrode interfaces Molecular dynamics simulation and ab intio studies of electrolytes and...
Molecular Dynamics Simulation of the AgCl/Electrolyte Interfacial...
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Simulation of the AgClElectrolyte Interfacial Capacity. Molecular Dynamics Simulation of the AgClElectrolyte Interfacial Capacity. Abstract: Molecular dynamics simulation of the...
Molecular Dynamics Study of the Proposed Proton Transport Pathways...
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Dynamics Study of the Proposed Proton Transport Pathways in FeFe-Hydrogenase. Molecular Dynamics Study of the Proposed Proton Transport Pathways in FeFe-Hydrogenase. Abstract:...
Probing the Dynamics of a Protein Hydrophobic Core by Deutron...
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Dynamics of a Protein Hydrophobic Core by Deutron Solid-State Nuclear Magnetic Resonance Spectroscopy . Probing the Dynamics of a Protein Hydrophobic Core by Deutron Solid-State...
Coherent Vibrational Dynamics and High-Resolution Nonlinear Spectrosco...
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Vibrational Dynamics and High-Resolution Nonlinear Spectroscopy: A Comparison with the AirDMSO Liquid Interface. Coherent Vibrational Dynamics and High-Resolution Nonlinear...
Atomic detail brownian dynamics simulations of concentrated protein...
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detail brownian dynamics simulations of concentrated protein solutions with a mean field treatment of hydrodynamic Atomic detail brownian dynamics simulations of concentrated...
Molecular dynamics simulation and ab intio studies of electrolytes...
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DFT calculations on molecular clusters and electrode surfaces, reactive molecular dynamics simulations allowing modeling of SEI formation, and classical molecular dynamics...
Comparative molecular dynamics analysis of tapasin-dependent...
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molecular dynamics analysis of tapasin-dependent and -independent MHC class I alleles. Comparative molecular dynamics analysis of tapasin-dependent and -independent MHC class I...
Vehicle Technologies Office Merit Review 2014: Dynamic Feasibility...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
Dynamic Feasibility Study Vehicle Technologies Office Merit Review 2014: Dynamic Feasibility Study Presentation given by Oak Ridge National Laboratory at 2014 DOE Hydrogen and Fuel...
analysis structural dynamics: Topics by E-print Network
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computational dynamical model and with experiments E approach. An extension to the probabilistic case of the input error methodology for modal analysis dynamical systems with...
autonomous nonlinear dynamical: Topics by E-print Network
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origins Kockelman, Kara M. 176 Uncertain nonlinear dynamical systems subjected to seismic loads C. Desceliers, C. Soize Physics Websites Summary: Uncertain nonlinear dynamical...
Dynamic Complexity Theory Revisited Volker Weber Thomas Schwentick
Schwentick, Thomas
Dynamic Complexity Theory Revisited Volker Weber Thomas Schwentick Fachbereich Informatik, UniversitÂ¨at Dortmund D-44227 Dortmund, Germany {Volker.Weber,Thomas.Schwentick}@udo.edu Abstract Dynamic
arctic ice dynamics: Topics by E-print Network
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W. F. Vincent (2008), Seasonal dynamics of bacterial Vincent, Warwick F. 168 Dynamics of artificial spin ice: a continuous honeycomb network MIT - DSpace Summary: We model the...
Dynamic Switching of the Spin Circulation in Tapered Magnetic...
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Dynamic Switching of the Spin Circulation in Tapered Magnetic Nanodisks Dynamic Switching of the Spin Circulation in Tapered Magnetic Nanodisks Print Monday, 22 April 2013 12:09...
Possible Dynamically Gated Conductance along Heme Wires in Bacterial...
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Possible Dynamically Gated Conductance along Heme Wires in Bacterial Multiheme Cytochromes. Possible Dynamically Gated Conductance along Heme Wires in Bacterial Multiheme...
Conformational Dynamics and Proton Relay Positioning in Nickel...
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Dynamics and Proton Relay Positioning in Nickel Catalysts for Hydrogen Production and Oxidation. Conformational Dynamics and Proton Relay Positioning in Nickel Catalysts for...
Structure and Dynamics of Polymer Nanocomposites by Grazing-Incidence...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
Structure and Dynamics of Polymer Nanocomposites by Grazing-Incidence X-Ray Techniques (Presentation) Structure and Dynamics of Polymer Nanocomposites by Grazing-Incidence X-Ray...
Salt Dynamics in Non-Riparian Freshwater Wetlands
Stacey, Mark T
2007-01-01T23:59:59.000Z
Resources Center Project “Salt Dynamics in Non-RiparianTechnical Completion Report “Salt Dynamics in Non-Riparianindicate that the flux of salt between the soil and water
Intermittent Single-Molecule Interfacial Electron Transfer Dynamics...
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Intermittent Single-Molecule Interfacial Electron Transfer Dynamics. Intermittent Single-Molecule Interfacial Electron Transfer Dynamics. Abstract: We report on single molecule...
EMSL Biological Interactions and Dynamics Science Theme Advisory...
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Biological Interactions and Dynamics Science Theme Advisory Panel Workshop EMSL Biological Interactions and Dynamics Science Theme Advisory Panel Workshop "Biological Interactions...
Characterizing and controlling the inherent dynamics of cyclophilin...
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and controlling the inherent dynamics of cyclophilin-A. Characterizing and controlling the inherent dynamics of cyclophilin-A. Abstract: With the recent advances in NMR relaxation...
Site-Specific Raman Spectroscopy and Chemical Dynamics of Nanoscale...
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Raman Spectroscopy and Chemical Dynamics of Nanoscale Interstitial Systems. Site-Specific Raman Spectroscopy and Chemical Dynamics of Nanoscale Interstitial Systems. Abstract:...
Flagella-Mediated Differences in Deposition Dynamics for Azotobacter...
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Flagella-Mediated Differences in Deposition Dynamics for Azotobacter vinelandii in Porous Media. Flagella-Mediated Differences in Deposition Dynamics for Azotobacter vinelandii in...
Atomistic Simulation of Nafion Membrane: 2. Dynamics of Water...
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2. Dynamics of Water Molecules and Hydronium Ions. Atomistic Simulation of Nafion Membrane: 2. Dynamics of Water Molecules and Hydronium Ions. Abstract: We have performed a...
Characterization of Dynamic Loads on Solar Modules with Respect...
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Characterization of Dynamic Loads on Solar Modules with Respect to Fracture of Solar Cells Characterization of Dynamic Loads on Solar Modules with Respect to Fracture of Solar...
Mineral Association Changes the Secondary Structure and Dynamics...
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Dynamics of Murine Amelogenin. Mineral Association Changes the Secondary Structure and Dynamics of Murine Amelogenin. Abstract: Biomineralization proteins, present during the...
HyDIVE (Hydrogen Dynamic Infrastructure and Vehicle Evolution...
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HyDIVE (Hydrogen Dynamic Infrastructure and Vehicle Evolution) Model Analysis HyDIVE (Hydrogen Dynamic Infrastructure and Vehicle Evolution) Model Analysis Presentation by NREL's...
An efficient parallelization scheme for molecular dynamics simulations...
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efficient parallelization scheme for molecular dynamics simulations with many-body, flexible, polarizable empirical An efficient parallelization scheme for molecular dynamics...
A Birkhoff theorem for Shape Dynamics
Henrique Gomes
2014-04-02T23:59:59.000Z
Shape Dynamics is a theory of gravity that replaces refoliation invariance for spatial Weyl invariance. Those solutions of the Einstein equations that have global, constant mean curvature slicings, are mirrored by solutions in Shape Dynamics. However, there are solutions of Shape Dynamics that have no counterpart in General relativity, just as there are solutions of GR that are not completely foliable by global constant mean curvature slicings (such as the Schwarzschild spacetime). It is therefore interesting to analyze directly the equations of motion of Shape Dynamics in order to find its own solutions, irrespective of properties of known solutions of GR. Here I perform a first study in this direction by utilizing the equations of motion of Shape Dynamics in a spherically symmetric, asymptotically flat ansatz to derive an analogue of the Birkhoff theorem. There are two significant differences with respect to the usual Birkhoff theorem in GR. The first regards the construction of the solution: the spatial Weyl gauge freedom of shape dynamics is used to simplify the problem, and boundary conditions are required. In fact the derivation is simpler than the usual Birkhof theorem as no Christoffel symbols are needed. The second, and most important difference is that the solution obtained is uniquely the isotropic wormhole solution, in which no singularity is present, as opposed to maximally extended Schwarzschild. This provides an explicit example of the breaking of the duality between General relativity and Shape Dynamics, and exhibits some of its consequences.
Dynamics of Kr in dense clathrate hydrates.
Klug, D. D.; Tse, J. S.; Zhao, J. Y.; Sturhahn, W.; Alp, E. E.; Tulk, C. A. (X-Ray Science Division); (National Research Council of Canada); (Univ. of Saskatchewan); (ORNL)
2011-01-01T23:59:59.000Z
The dynamics of Kr atoms as guests in dense clathrate hydrate structures are investigated using site specific {sup 83}Kr nuclear resonant inelastic x-ray scattering (NRIXS) spectroscopy in combination with molecular dynamics simulations. The dense structure H hydrate and filled-ice structures are studied at high pressures in a diamond anvil high-pressure cell. The dynamics of Kr in the structure H clathrate hydrate quench recovered at 77 K is also investigated. The Kr phonon density of states obtained from the experimental NRIXS data are compared with molecular dynamics simulations. The temperature and pressure dependence of the phonon spectra provide details of the Kr dynamics in the clathrate hydrate cages. Comparison with the dynamics of Kr atoms in the low-pressure structure II obtained previously was made. The Lamb-Mossbauer factor obtained from NRIXS experiments and molecular dynamics calculations are in excellent agreement and are shown to yield unique information on the strength and temperature dependence of guest-host interactions.
New insights on the Dynamic Cellular Metabolism
Ildefonso M. De la Fuente
2015-01-09T23:59:59.000Z
A large number of studies have shown the existence of metabolic covalent modifications in different molecular structures, able to store biochemical information that is not encoded by the DNA. Some of these covalent mark patterns can be transmitted across generations (epigenetic changes). Recently, the emergence of Hopfield-like attractor dynamics has been observed in the self-organized enzymatic networks, which have the capacity to store functional catalytic patterns that can be correctly recovered by the specific input stimuli. The Hopfield-like metabolic dynamics are stable and can be maintained as a long-term biochemical memory. In addition, specific molecular information can be transferred from the functional dynamics of the metabolic networks to the enzymatic activity involved in the covalent post-translational modulation so that determined functional memory can be embedded in multiple stable molecular marks. Both the metabolic dynamics governed by Hopfield-type attractors (functional processes) and the enzymatic covalent modifications of determined molecules (structural dynamic processes) seem to represent the two stages of the dynamical memory of cellular metabolism (metabolic memory). Epigenetic processes appear to be the structural manifestation of this cellular metabolic memory. Here, a new framework for molecular information storage in the cell is presented, which is characterized by two functionally and molecularly interrelated systems: a dynamic, flexible and adaptive system (metabolic memory) and an essentially conservative system (genetic memory). The molecular information of both systems seems to coordinate the physiological development of the whole cell.
Kobara, Shinichi
2011-02-22T23:59:59.000Z
by SHINICHI KOBARA Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY Approved by: Co-Chairs of Committee, William D. Heyman Anthony M. Filippi.... (December 2009) Shinichi Kobara, B.A., Soka University of Japan; M.Eng., Soka University of Japan Co-Chairs of Advisory Committee: Dr. William D. Heyman Dr. Anthony M. Filippi Overfishing of stock and decreasing biodiversity are grave...
Non-linear load-deflection models for seafloor interaction with steel catenary risers
Jiao, Yaguang
2009-05-15T23:59:59.000Z
or attached to the riser would be washed away. 10 2.1.4 Model Tests of Steel Catenary Riser A full scale mode test of a steel catenary riser was conducted as part of the STRIDE III JIP, by 2H Offshore Engineering Ltd to investigate the effects of fluid...) developed advanced soil stiffness and soil suction models using STRIDE and CARISIMA JIP test data and other published literature data. This newer model describes the load-deflection response of the soil-pipe interaction associated with the riser vertical...
Seafloor geodetic measurements and modeling of Nazca-South America plate convergence
Gagnon, Katie L.
2007-01-01T23:59:59.000Z
Increased ?uid pressure allows stable sliding by decreasinghigh ?uid pressures may contribute to stable sliding (Brownsliding is likely caused by a combination of di- agenetic, metamorphic and ?uid pressure
Using seafloor geodesy to monitor volcanic collapse on the south flank of Kilauea Volcano, Hawaii
Phillips, Kathleen A.
2006-01-01T23:59:59.000Z
Photo of PXP on deck with pressure sensorPhoto of a benchmark on deck with pressure sensorII.4 Photo of PXP on deck with pressure sensor rigging.
archean seafloor-hydrothermal systems: Topics by E-print Network
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together all its disorders. The systemic destruction involves adaptation and self-organization processes in the locomotor system, whose side effects introduce a positive...
Ignisca, Anamaria
Recently reported declines in the population of Atlantic cod have led to calls for additional survey methods for stock assessments. In combination with conventional line-transect methods that may have ambiguities in sampling ...
seafloor anoxia during the mid-Proterozoic was expanded compared to today during at
Coates, Michael
. Petrol. Geol. Bull. 72, 1495 (1988). 33. T. H. Donnelly, M. J. Jackson, Sediment. Geol. 58, 145 (1988
New Hampshire, University of
is developing a battery-powered buoy which houses the sounder, navigation receiver, data acquisition system, radiotelemetry system, and battery power sufficient for about three years of operation. Alternatively the depth sounder, by itself, can be incorporated into other multi-instrument moorings or buoys. During 1994
Using seafloor geodesy to monitor volcanic collapse on the south flank of Kilauea Volcano, Hawaii
Phillips, Kathleen A.
2006-01-01T23:59:59.000Z
seismic interpretation . . . . . . . . . . . . . . . . . . . .Figure I.16 shows the seismic interpretation from Morgan etMorgan et al. seismic interpretation. Figure from (Morgan et
Seismic Structure of Shallow Lithosphere at Locations of Distinctive Seafloor Spreading /
Henig, Ashlee Shae
2013-01-01T23:59:59.000Z
Lithologic interpretations of our seismic results are guidedx and z. Interpretation of the 2D seismic velocity models (to aid in interpretation of rock type from seismic velocity.
Kobara, Shinichi
2011-02-22T23:59:59.000Z
Cayo Diego P?rez Cayo Lanzanillo Cayo Avalos Cayo Fragoso Punta Franc?s Cayo Calm?n Grande Cayos Los Indios Cayo Pared?n Cayo San Felipe Cayo Sabinal Cabo Corrientes Cayman Islands 6 GC Sand Caye GC Northeast end 1, 2, 14...
GULF OF MEXICO SEAFLOOR STABILITY AND GAS HYDRATE MONITORING STATION PROJECT
J. Robert Woolsey; Thomas M. McGee; Robin C. Buchannon
2004-11-01T23:59:59.000Z
The gas hydrates research Consortium (HRC), established and administered at the University if Mississippi's Center for Marine Research and Environmental Technology (CMRET) has been active on many fronts in FY 03. Extension of the original contract through March 2004, has allowed completion of many projects that were incomplete at the end of the original project period due, primarily, to severe weather and difficulties in rescheduling test cruises. The primary objective of the Consortium, to design and emplace a remote sea floor station for the monitoring of gas hydrates in the Gulf of Mexico by the year 2005 remains intact. However, the possibility of levering HRC research off of the Joint Industries Program (JIP) became a possibility that has demanded reevaluation of some of the fundamental assumptions of the station format. These provisions are discussed in Appendix A. Landmark achievements of FY03 include: (1) Continuation of Consortium development with new researchers and additional areas of research contribution being incorporated into the project. During this period, NOAA's National Undersea Research Program's (NURP) National Institute for Undersea Science and Technology (NIUST) became a Consortium funding partner, joining DOE and Minerals Management Service (MMS); (2) Very successful annual and semiannual meetings in Oxford Mississippi in February and September, 2003; (3) Collection of piston cores from MC798 in support of the effort to evaluate the site for possible monitoring station installation; (4) Completion of the site evaluation effort including reports of all localities in the northern Gulf of Mexico where hydrates have been documented or are strongly suspected to exist on the sea floor or in the shallow subsurface; (5) Collection and preliminary evaluation of vent gases and core samples of hydrate from sites in Green Canyon and Mississippi Canyon, northern Gulf of Mexico; (6) Monitoring of gas activity on the sea floor, acoustically and thermally; (7) Design, construction, and successful deployment of an in situ pore-water sampling device; (8) Improvements to the original Raman spectrometer (methane sensor); (9) Laboratory demonstration of the impact of bacterially-produced surfactants' rates of hydrate formation; (10) Construction and sea floor emplacement and testing--with both watergun and ship noise sources--of the prototypal vertical line array (VLA); (11) Initiation of studies of spatial controls on hydrates; (12) Compilation and analyses of seismic data, including mapping of surface anomalies; (13) Additional field verification (bottom samples recovered), in support of the site selection effort; (14) Collection and preliminary analyses of gas hydrates from new sites that exhibit variant structures; (15) Initial shear wave tests carried out in shallow water; (16) Isolation of microbes for potential medicinal products development; (17) Preliminary modeling of occurrences of gas hydrates.
Blue and fin whales observed on a seafloor array in the Northeast Pacific
McDonald, Mark A.; Hildebrand, John A; Webb, Spahr C.
1995-01-01T23:59:59.000Z
Clark,C. W. (1994). "Blue deepvoices: Insights fromIhe Navy1971). "Underwater sounds from the blue whale,BalaenopteraK. , and Leatherwood, (1985). "Blue Whale: Bah•enoptera S.
Automated artifact-free seafloor surface reconstruction with two-step ODETLAP (Ph.D. Showcase)
Franklin, W. Randolph
, represents the depth and features of the ocean floor. This piece of data helps solve not only applications water which masks the penetration of electromagnetic waves. The altimeter method is an attempt for wide-area coverage. The method exploits the fact that the ocean surface has broad bumps and dips that mimic
Seafloor ripples created by waves from hurricane Ivan on the west Florida shelf
Bowers, Colleen Marie
2006-01-01T23:59:59.000Z
Recent studies have shown that the presence of sand ripples on the seabed improves sonar detection of buried mines at sub-critical angles. Sidescan sonar data of ripples off on the west Florida shelf were collected as part ...
Converted wave imaging in anisotropic media using sea-floor seismic data
Mancini, Fabio
velocity ratio is derived conventionally by event matching in the P-wave and converted wave stacks. I present an attempt to use well-log derived velocity ratios to avoid this interpretative step. The velocity ratio derived from 4C seismic data is about 30...
TRACKING CODE DEVELOPMENT FOR BEAM DYNAMICS OPTIMIZATION
Yang, L.
2011-03-28T23:59:59.000Z
Dynamic aperture (DA) optimization with direct particle tracking is a straight forward approach when the computing power is permitted. It can have various realistic errors included and is more close than theoretical estimations. In this approach, a fast and parallel tracking code could be very helpful. In this presentation, we describe an implementation of storage ring particle tracking code TESLA for beam dynamics optimization. It supports MPI based parallel computing and is robust as DA calculation engine. This code has been used in the NSLS-II dynamics optimizations and obtained promising performance.
Dynamics of the Aharonov-Bohm effect
Neven Simicevic
2010-03-24T23:59:59.000Z
The time-dependent Dirac equation is solved using the three-dimensional Finite Difference-Time Domain (FDTD) method. The dynamics of the electron wave packet in a vector potential is studied in the arrangements associated with the Aharonov-Bohm effect. The solution of the Dirac equation showed a change in the velocity of the electron wave packet even in a region where no fields of the unperturbed solenoid acted on the electron. The solution of the Dirac equation qualitatively agreed with the prediction of classical dynamics under the assumption that the dynamics was defined by the conservation of generalized or canonical momentum of the electron.
On the Dynamics of Inclined Neptune's Trojans
Li-Yong Zhou; Rudolf Dvorak; Yi-Sui Sun
2008-11-17T23:59:59.000Z
The dynamics of artificial asteroids on the Trojan-like orbits around Neptune is investigated in this paper. We describe the dependence of the orbital stability on the initial semimajor axis a and inclination i by constructing a dynamical map on the (a,i)-plane. Rich details are revealed in the dynamical map, especially a unstable gap at i=45 deg is determined and the mechanism triggering chaos in this region is figured out. Our investigation can be used to guide the observations.
Protein viscoelastic dynamics: a model system
Craig Fogle; Joseph Rudnick; David Jasnow
2015-02-02T23:59:59.000Z
A model system inspired by recent experiments on the dynamics of a folded protein under the influence of a sinusoidal force is investigated and found to replicate many of the response characteristics of such a system. The essence of the model is a strongly over-damped oscillator described by a harmonic restoring force for small displacements that reversibly yields to stress under sufficiently large displacement. This simple dynamical system also reveals unexpectedly rich behavior, exhibiting a series of dynamical transitions and analogies with equilibrium thermodynamic phase transitions. The effects of noise and of inertia are briefly considered and described.
Global Dynamics in Galactic Triaxial Systems I
Pablo M. Cincotta; Claudia M. Giordano; Josefa Perez; .
2006-04-21T23:59:59.000Z
In this paper we present a theoretical analysis of the global dynamics in a triaxial galactic system using a 3D integrable Hamiltonian as a simple representation. We include a thorough discussion on the effect of adding a generic non--integrable perturbation to the global dynamics of the system. We adopt the triaxial Stackel Hamiltonian as the integrable model and compute its resonance structure in order to understand its global dynamics when a perturbation is introduced. Also do we take profit of this example in order to provide a theoretical discussion about diffussive processes taking place in phase space.
Analysis of Dynamic Multiplicity Fluctuations at PHOBOS
Zhengwei Chai; for the PHOBOS Collaboration
2005-09-20T23:59:59.000Z
This paper presents the analysis of the dynamic fluctuations in the inclusive charged particle multiplicity measured by PHOBOS for Au+Au collisions at sqrt(s_NN)=200$GeV within the pseudo-rapidity range of -3analysis is presented, together with the discussion of their physics meaning. Then the procedure for the extraction of dynamic fluctuations is described. Some preliminary results are included to illustrate the correlation features of the fluctuation observable. New dynamic fluctuations results will be available in a later publication.
SIAM conference on applications of dynamical systems
Not Available
1992-01-01T23:59:59.000Z
A conference (Oct.15--19, 1992, Snowbird, Utah; sponsored by SIAM (Society for Industrial and Applied Mathematics) Activity Group on Dynamical Systems) was held that highlighted recent developments in applied dynamical systems. The main lectures and minisymposia covered theory about chaotic motion, applications in high energy physics and heart fibrillations, turbulent motion, Henon map and attractor, integrable problems in classical physics, pattern formation in chemical reactions, etc. The conference fostered an exchange between mathematicians working on theoretical issues of modern dynamical systems and applied scientists. This two-part document contains abstracts, conference program, and an author index.
Non-Markovian dynamics of quantum discord
Fanchini, F. F.; Caldeira, A. O. [Instituto de Fisica Gleb Wataghin, Universidade Estadual de Campinas, Post Office Box 6165, 13083-970, Campinas, SP (Brazil); Werlang, T. [Departamento de Fisica, Universidade Federal de Sao Carlos, Post Office Box 676, 13565-905, Sao Carlos, SP (Brazil); Brasil, C. A.; Arruda, L. G. E. [Instituto de Fisica de Sao Carlos, Universidade de Sao Paulo, Post Office Box 369, 13560-970, Sao Carlos, SP (Brazil)
2010-05-15T23:59:59.000Z
We evaluate the quantum discord dynamics of two qubits in independent and common non-Markovian environments. We compare the dynamics of entanglement with that of quantum discord. For independent reservoirs the quantum discord vanishes only at discrete instants whereas the entanglement can disappear during a finite time interval. For a common reservoir, quantum discord and entanglement can behave very differently with sudden birth of the former but not of the latter. Furthermore, in this case the quantum discord dynamics presents sudden changes in the derivative of its time evolution which is evidenced by the presence of kinks in its behavior at discrete instants of time.
Dynamic structure factors of a dense mixture
Supurna Sinha
2005-05-22T23:59:59.000Z
We compute the dynamic structure factors of a dense binary liquid mixture. These describe dynamics on molecular length scales, where structural relaxation is important. We find that the presence of a few large particles in a dense fluid of small particles slows down the dynamics considerably. We also observe a deep narrowing of the spectrum for a disordered mixture composed of a nearly equal packing of the two species. In contrast, a few small particles diffuse easily in the background of a dense fluid of large particles. We expect our results to describe neutron scattering from a dense mixture.
Dynamical clustering of counterions on flexible polyelectrolytes
Tak Shing Lo; Boris Khusid; Joel Koplik
2007-07-31T23:59:59.000Z
Molecular dynamics simulations are used to study the local dynamics of counterion-charged polymer association at charge densities above and below the counterion condensation threshold. Surprisingly, the counterions form weakly-interacting clusters which exhibit short range orientational order, and which decay slowly due to migration of ions across the diffuse double layer. The cluster dynamics are insensitive to an applied electric field, and qualitatively agree with the available experimental data. The results are consistent with predictions of the classical theory only over much longer time scales.
Geometric algebra and particle dynamics
Jose B. Almeida
2005-07-12T23:59:59.000Z
In a recent publication the I showed how the geometric algebra ${G}_{4,1}$, the algebra of 5-dimensional space-time, can generate relativistic dynamics from the simple principle that only null geodesics should be allowed. The same paper showed also that Dirac equation could be derived from the condition that a function should be monogenic in that algebra; this construction of the Dirac equation allows a choice for the imaginary unit and it was suggested that different imaginary units could be assigned to the various elementary particles. An earlier paper had already shown the presence of standard model gauge group symmetry in complexified ${G}_{1,3}$, an algebra isomorphic to ${G}_{4,1}$. In this presentation I explore the possible choices for the imaginary unit in the Dirac equation to show that SU(3) and SU(2) symmetries arise naturally from such choices. The quantum numbers derived from the imaginary units are unusual but a simple conversion allows the derivation of electric charge and isospin, quantum numbers for two families of particles. This association to elementary particles is not final because further understanding of the role played by the imaginary unit is needed.
Robustness of Controlled Quantum Dynamics
Andy Koswara; Raj Chakrabarti
2014-09-29T23:59:59.000Z
Control of multi-level quantum systems is sensitive to implementation errors in the control field and uncertainties associated with system Hamiltonian parameters. A small variation in the control field spectrum or the system Hamiltonian can cause an otherwise optimal field to deviate from controlling desired quantum state transitions and reaching a particular objective. An accurate analysis of robustness is thus essential in understanding and achieving model-based quantum control, such as in control of chemical reactions based on ab initio or experimental estimates of the molecular Hamiltonian. In this paper, theoretical foundations for quantum control robustness analysis are presented from both a distributional perspective - in terms of moments of the transition amplitude, interferences, and transition probability - and a worst-case perspective. Based on this theory, analytical expressions and a computationally efficient method for determining the robustness of coherently controlled quantum dynamics are derived. The robustness analysis reveals that there generally exists a set of control pathways that are more resistant to destructive interferences in the presence of control field and system parameter uncertainty. These robust pathways interfere and combine to yield a relatively accurate transition amplitude and high transition probability when uncertainty is present.
Dynamical generation of hadronic resonances
Thomas Wolkanowski
2014-10-26T23:59:59.000Z
One type of dynamical generation consists in the formation of multiple hadronic resonances from single seed states by incorporating hadronic loop contributions on the level of $s$-wave propagators. Along this line, we study the propagator poles within two models of scalar resonances and report on the status of our work: (i) Using a simple quantum field theory describing the decay of $f_{0}(500)$ into two pions, we may obtain a second, additional pole on the first Riemann sheet below the pion-pion threshold (i.e., a stable state can emerge). (ii) We perform a numerical study of the pole(s) of $a_{0}(1450)$ by using as an input the results obtained in the extended Linear Sigma Model (eLSM). Here, we do not find any additional pole besides the original one, thus we cannot obtain $a_{0}(980)$ as an emerging state. (iii) We finally demonstrate that, although the coupling constants in typical effective models might be large, the next-to-leading-order contribution to the decay amplitude is usually small and can be neglected.
Vortex driven flame dynamics and combustion instability
Altay, Hurrem Murat
2005-01-01T23:59:59.000Z
Combustion instability in premixed combustors mostly arises due to the coupling between heat release rate dynamics and system acoustics. It is crucial to understand the instability mechanisms to design reliable, high ...
A Dynamic Theory of Resource Wars
Acemoglu, Daron
2010-12-31T23:59:59.000Z
We develop a dynamic theory of resource wars and study the conditions under which such wars can be prevented. The interaction between the scarcity of resources and the incentives for war in the presence of limited commitment ...
Optimal control with adaptive internal dynamics models
Mitrovic, Djordje; Klanke, Stefan; Vijayakumar, Sethu
2008-01-01T23:59:59.000Z
Optimal feedback control has been proposed as an attractive movement generation strategy in goal reaching tasks for anthropomorphic manipulator systems. The optimal feedback control law for systems with non-linear dynamics ...
The Dynamics and Predictability of Tropical Cyclones
Sippel, Jason A.
2010-01-15T23:59:59.000Z
Through methodology unique for tropical cyclones in peer-reviewed literature, this study explores how the dynamics of moist convection affects the predictability of tropical cyclogenesis. Mesoscale models are used to perform short-range ensemble...
A Dynamic Defense Force for Japan
TAKAHASHI, Sugio
2012-01-01T23:59:59.000Z
Japan Self-Defense Forces (SDF). Along with the new NDPG,set a direction for the SDF in the post-9/11 inter- nationalsituation also requires the SDF take on these “dynamic”
Inertial Particle Dynamics in a Hurricane
Sapsis, Themistoklis
The motion of inertial (i.e., finite-size) particles is analyzed in a three-dimensional unsteady simulation of Hurricane Isabel. As established recently, the long-term dynamics of inertial particles in a fluid is governed ...