Oil & Natural Gas Technology Temporal Characterization of Hydrates System Dynamics beneath Seafloor
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5(Million Cubic Feet) Oregon (Including Vehicle Fuel) (Million Cubic Feet) NaturalOctober October 2015unsteady aerodynamic andPriceThousandResearchOilOil
Microbes: Life Deep Beneath the Seafloor
Smith, David C.
to acceptor is captured to provide the energy to support basic metabolic functions. Microorganisms-dwelling organisms rely on oxygen, microbes use compounds of sulfur, manganese, iron, and carbon dioxide
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
Scholte waves generated by seafloor topography
Zheng, Yingcai
2012-01-01T23:59:59.000Z
Seafloor topography can excite strong interface waves called Scholte waves that are often dispersive and characterized by slow propagation but large amplitude. This type of wave can be used to invert for near seafloor shear ...
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 ...
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
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
Numerical model for steel catenary riser on seafloor support
You, Jung Hwan
2007-04-25T23:59:59.000Z
of development of a simplified seafloor support model. This model simulates the seafloor-pipe interaction as a flexible pipe supported on a bed of springs. Constants for the soil springs were derived from finite element studies performed in a separate, parallel...
Sensing Shallow Seafloor and Sediment Properties, Recent History
Harris, Michael M; Abelev, Andrei; Bentrem, Frank W; Bibee, L Dale
2008-01-01T23:59:59.000Z
Near surface seafloor properties are needed for recreational, commercial, and military applications. Construction projects on the ocean seafloors often require extensive knowledge about strength, deformability, hydraulic, thermal, acoustic, and seismic characteristics for locating stable environments and ensuring proper functioning of structures, pipelines, and other installations on the surface of and buried into the marine sediments. The military is also interested in a variety of seafloor properties as they impact sound propagation, mine impact burial, trafficability, bearing capacity, time-dependent settlement, and stability of objects on the seafloor. Point measurements of sediment properties are done using core samplers and sediment grab devices (with subsequent lab analysis) and in-situ probes. These techniques are expensive in terms of ship time and provide limited area coverage. Sub-bottom acoustic and electromagnetic sensors can provide profiles of near surface sediment information with improved cov...
Physical properties of seafloor sediments from the Russian Pechora Sea
Sarmiento, Sergio Eduardo
1996-01-01T23:59:59.000Z
PHYSICAL PROPERTIES OF SEAFLOOR SEDIMENTS FROM THE RUSSIAN PECHORA SEA A Thesis by SERGIO EDUARDO SARMIENTO Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree... of MASTER OF SCIENCE May 1996 Major Subject: Oceanography PHYSICAL PROPERTIES OF SEAFLOOR SEDIMENTS FROM THE RUSSIAN PECHORA SEA A Thesis by SERGIO EDUARDO SARMIENTO Submitted to Texas A&M University in partial fulfillment of the requirements...
Non-linear load-deflection models for seafloor interaction with steel catenary risers
Jiao, Yaguang
2009-05-15T23:59:59.000Z
The simulation of seafloor-steel catenary interaction and prediction of riser fatigue life required an accurate characterization of seafloor stiffness as well as realistic description of riser load-deflection (P-y) response. ...
Texas at Austin, University of
Multicomponent seismic data have unique value for studying near-seafloor geology in deepwater multicomponent seismic data acquired in deepwater with seafloor sensors show near- seafloor geology. The target zone for gas-hydrate exploration across the Gulf of Mexico consists of the upper several hundred
Imaging the mantle beneath Iceland using integrated seismological techniques
Foulger, G. R.
Imaging the mantle beneath Iceland using integrated seismological techniques Richard M. Allen,1 head, this study presents a tomographic image of the mantle structure beneath Iceland to 400 km depth velocity information for the uppermost mantle beneath Iceland. The average wave number for the Love wave
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:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article) |govInstrumentsmfrirtA Journey Inside the Complex and PowerfulJosephCenterCenterLong Fingers of Heat Beneath Earth's Surface
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...
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,...
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 ...
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
Recent advances and trends in subsea technologies and seafloor properties characterization
Djikpesse, Hugues
Following the 2012 SEG Annual Meeting in Las Vegas, the SEG Research Committee sponsored a post-convention research workshop on subsea technologies, in general, and on seafloor characterization in particular. The goal of ...
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
Mantle transition zone topography and structure beneath the Yellowstone hotspot
Dueker, Ken
Mantle transition zone topography and structure beneath the Yellowstone hotspot David Fee and Ken ± 1.6 km, with 3640 km of peak to peak topography. This topography is spatially uncorrelated, providing no evidence for a lower mantle plume currently beneath the hotspot. The topography suggests
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 ...
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 ...
Structure and Stratigraphy Beneath a Young Phreatic Vent: South...
H. Heiken and Kenneth H. Wohletz Published Journal Journal of Geophysical Research, 1988 DOI 10.1029JB093iB11p13208 Online Internet link for Structure and Stratigraphy Beneath...
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 ...
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
Measurement of Tidal Form Drag Using Seafloor Pressure Sensors SALLY J. WARNER AND PARKER MACCREADY
MacCready, Parker
tides. The tidally averaged power removed from the tidal currents by form drag was 0.2 W m22 , whichMeasurement of Tidal Form Drag Using Seafloor Pressure Sensors SALLY J. WARNER AND PARKER MACCREADY the tidal form drag on a sloping ridge in 200 m of water that forms a 1-km headland at the surface in Puget
Virtual Seafloor Reduces Internal Wave Generation by Tidal Flow Likun Zhang*
the applicability of linear theory to global predictions of the conversion of tidal energy into internal wave energy of the energy budget of the oceans requires a determination of the efficiency of conversion of tidal energyVirtual Seafloor Reduces Internal Wave Generation by Tidal Flow Likun Zhang* and Harry L. Swinney
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
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
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
Mantle structure beneath the western United States and its implications for convection processes
Allen, Richard M.
River Plain (ESRP) and the High Lava Plains, and a deep low velocity anomaly (>600 km) beneath the ESRP and dips toward the northwest; (3) shallow low velocity anomalies (upper 200 km) beneath the eastern Snake
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 ...
Imaging seismic velocity structure beneath the Iceland hot spot: A finite frequency approach
Shen, Yang
Imaging seismic velocity structure beneath the Iceland hot spot: A finite frequency approach Shu and S wave speeds extending from shallow mantle to 400 km depth beneath Iceland. In reality, seismic waves anomaly beneath Iceland and its geodynamic implications. We developed a tomographic method that utilizes
Basal melt rates beneath Whillans Ice Stream, West Antarctica
Beem, Lucas H.; Jezek, Ken C.; van der Veen, Cornelis J.
2010-08-05T23:59:59.000Z
thickness, and S=U(b)/U(h) is the sliding ratio which varies laterally across the shear margin. Basal drag, #2;b, basal velocity, U(b), basal temperature gradient, @T/@z(b), esti- mates of geothermal flux, G, plus knowledge of basal ice properties, density... of subglacial lakes situated beneath the Siple Coast ice streams (Fricker and others, 2007; Smith and others, 2009), along with changes in longitudinal stress gradients due to changes in terminal geometry (i.e. grounding line position, ice shelves) are the two...
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
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...
Buehler, Janine Sylvia
2013-01-01T23:59:59.000Z
SN), Mojave (M), Snake River Plain. (SRP), Northern Rockysplitting beneath the Snake River Plain suggests a mantleSierra Nevada (SN), Snake River Plain (SRP), Northern Rocky
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
On the tsunami-induced EM fields at the seafloor: Lessons learned from the 2006-2007 Kuril
Cerveny, Vlastislav
On the tsunami-induced EM fields at the seafloor: Lessons learned from the 2006-2007 Kuril and 2011 Tohoku tsunamis Hiroaki Toh, D.Sc. Graduate School of Science, Kyoto University, Japan Ctvrtek, 6. r with tsunamis from two earthquakes occurred along the Kuril Trench. Previous seismological analyses indicated
Seismic tomography shows that upwelling beneath Iceland is confined to the upper mantle
Allen, Richard M.
Seismic tomography shows that upwelling beneath Iceland is confined to the upper mantle G. R of Iceland, Bustadavegi 9, Reykjavik, Iceland 5 National Energy Authority, Grensasvegi 9, Reykjavik, Iceland of the highest-resolution teleseismic tomography study yet performed of the upper mantle beneath Iceland
Thermal, hydrous, and mechanical states of the mantle transition zone beneath southern Africa
Shen, Yang
Thermal, hydrous, and mechanical states of the mantle transition zone beneath southern Africa John cratons in southern Africa; consequently, the mantle transition zone is 20 km thicker than beneath post: lithosphere; upper mantle; transition zone; cratoni convection; Southern Africa 1. Introduction The upper
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
Demouchy, Sylvie
Belt-parallel mantle flow beneath a halted continental collision: The Western Alps Guilhem Barruol belts, is a particularly important objective of "mantle tectonics" that may bring a depth extent a coherent picture of upper mantle anisotropy beneath the belt. The large-scale anisotropy pattern
Influence of tides on melting and freezing beneath FilchnerRonne Ice Shelf, Antarctica
Holland, David
Influence of tides on melting and freezing beneath FilchnerRonne Ice Shelf, Antarctica Keith doubles. With tidal forcing, the spatial pattern and magnitude of basal melting and freezing generally), Influence of tides on melting and freezing beneath FilchnerRonne Ice Shelf, Antarctica, Geophys. Res. Lett
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
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
Grenville foreland thrust belt hidden beneath the eastern US midcontinent
Hauser, E.C. (Cornell Univ., Ithaca, NY (United States))
1993-01-01T23:59:59.000Z
Grenville foreland thrust structures are observed beneath the eastern US midcontinent on COCORP (Consortium for Continental Reflection Profiling) line OH-1 and a short seismic line in southwest Ohio. These structures represent the first evidence for a significant Grenville foreland thrust belt preserved in eastern North America. On the COCORP lines, the structures include a thrust ramp anticline and an associated asymmetric syncline. The Grenville front tectonic zone appears to truncate these foreland structures, indicating a later, second phase expressed as a deeply penetrating, out-of-sequence thrust zone associated with the main uplift of the Grenville province on the east. A short, shallow seismic line in southwestern Ohio reveals an east-dipping sequence of prominently layered rocks that may lie above a footwall ramp to a deeper Grenville thrust fault. A drill hole into the less reflective top of this dipping sequence encountered unmetamorphosed sedimentary rocks like those increasingly reported from other drill holes in southwestern Ohio and adjacent states. Although possibly part of a late Precambrian (Keweenawan ) rift, these clastic sedimentary rocks may instead preserve evidence of a heretofore unrecognized Grenville foreland basin in eastern North America. Alternatively these Precambrian sedimentary rocks together with an underlying, but yet undrilled, strongly layered sequence may correlate with similarly layered rocks observed on COCORP and industrial seismic lines within the Middle Proterozoic granite-rhyolite province to the west in Indiana and Illinois and indicate that unmetamorphosed sedimentary material is an important constituent of the granite-rhyolite province. 25 refs., 6 figs.
Imaging crust and upper mantle beneath Mount Fuji, Japan, by receiver functions
Aoki, Yosuke
, resulting in little knowledge about the seismic structure there. To gain more insight into the magma with magmatic differentiation is suppressed. Fujii [2007] concluded that the magma reservoir beneath Mount Fuji
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...
Layered rocks beneath the Phanerozoic platform of the US midcontinent
Hauser, E.C. (Cornell Univ., Ithaca, NY (United States))
1991-03-01T23:59:59.000Z
A thick sequence of layered rocks lies hidden beneath the Phanerozoic cover of the central US over large regions. A thick sequence of Precambrian layered rocks in imaged on the COCORP transect across southern Illinois and Indiana. The thickness of this layered sequence varies from 1-3 times the thickness of the overlying Phanerozoic section of the Illinois basin. The layered sequence is observed for close to 200 km in an east-west direction. Similar layered reflections are seen on the COCORP data from Hardeman Co., TX, and neighboring southwest Oklahoma. Both of these known occurrences lie within the region of the middle Proterozoic Granite/Rhyolite province of the US midcontinent, an area within which scattered wells to basement commonly encounter 1.3-1.5 Ga undeformed granite and/or compositionally similar rhyolite. Therefore, these layered assemblages may comprise a thick sequence of silicic volcanic and sedimentary rocks (perhaps also injected by mafic sills) between scattered volcanic-intrusive centers, such as exposed in the St. Francois Mountains of southeast Missouri. However, in places such as Illinois and Indiana, the near absence of deep wells leaves the possibility that the upper portion of these layered rocks may locally be of late Proterozoic or earliest Paleozoic age. The reprocessing of available industry data, analyzed in conjunction with the existing COCORP data, includes extended vibroseis correlation. These industry data are invaluable in the author's effort to expand the known distribution of these layered rocks (e.g., into north-central Illinois) and to map their structures.
The entrainment of oil droplets in flow beneath an oil slick
Chao, Chien-Hwa
1973-01-01T23:59:59.000Z
THE ENTRAINMENT OF OIL DROPLETS IN PLOW BENEATH AN OIL SLICK A Thesis by CHIEN-HWA CHAO Submitted to the Graduate College of Texas ASM University in partial fulfillment of the requirement for the degree of MASTER OP SCIENCE August 1973 Ma...)or Sub)ect: Mechanical Engineering THE ENTRAINMENT OF OIL DROPLETS IN FLOW BENEATH AN OIL SLICK A Thesis CHIEN-HWA CHAD Approved as to style and content by: ( hairman o Committee) (Head of De tment) C ( (Member) ber) (Member) August 1973...
Supergranular-scale magnetic flux emergence beneath an unstable filament
Palacios, J; Guerrero, A; Saiz, E; Cerrato, Y
2015-01-01T23:59:59.000Z
Here we report evidence of a large solar filament eruption on 2013, September 29. This smooth eruption, which passed without any previous flare, formed after a two-ribbon flare and a coronal mass ejection towards Earth. The coronal mass ejection generated a moderate geomagnetic storm on 2013, October 2 with very serious localized effects. The whole event passed unnoticed to flare-warning systems. We have conducted multi-wavelength analyses of the Solar Dynamics Observatory through Atmospheric Imaging Assembly (AIA) and Helioseismic and Magnetic Imager (HMI) data. The AIA data on 304, 193, 211, and 94 \\AA sample the transition region and the corona, respectively, while HMI provides photospheric magnetograms, continuum, and linear polarization data, in addition to the fully inverted data provided by HMI. [...] We have observed a supergranular-sized emergence close to a large filament in the boundary of the active region NOAA11850. Filament dynamics and magnetogram results suggest that the magnetic flux emergenc...
Evidence from P-to-S mantle converted waves for a flat b660-kmQ discontinuity beneath Iceland
Foulger, G. R.
Evidence from P-to-S mantle converted waves for a flat b660-kmQ discontinuity beneath Iceland Z. Du; accepted 19 September 2005 Available online 22 November 2005 Editor: R.D. van der Hilst Abstract Iceland discontinuity beneath central Iceland is shallow relative to peripheral regions and this was interpreted
Shen, Yang
P-wave velocity structure of the crust and uppermost mantle beneath Iceland from local earthquake and uppermost mantle beneath Iceland, the keys to understanding the magma plumbing system of the hotspot develop a three-dimensional P-wave velocity model of the Icelandic crust and uppermost mantle from
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
Seismic evidence for a tilted mantle plume and north^south mantle ow beneath Iceland
Shen, Yang
Seismic evidence for a tilted mantle plume and north^south mantle £ow beneath Iceland Yang Shen a.W., Washington, DC 20015, USA c Science Institute, University of Iceland, Reykjavik, Iceland d Department, Grensasvegi 9, Reykjavik, Iceland f Meteorological O/ce of Iceland, Bustadavegi 9, Reykjavik, Iceland g US
Montagner, Jean-Paul
geochemistry beneath eastern Africa Jean-Paul Montagner,1 Bernard Marty,2 Ele´onore Stutzmann,1 De for North and East Africa using a high resolution three-dimensional anisotropic tomographic model derived from seismic data of a French experiment ``Horn of Africa'' and existing broadband data. The joint
Mantle flow beneath northwestern Venezuela: Seismic evidence for a deep origin of the Mrida Andes
Niu, Fenglin
Mantle flow beneath northwestern Venezuela: Seismic evidence for a deep origin of the Mérida Andes University, Houston, TX, USA b Fundación de Investigaciones Simológicas (FUNVISIS), Caracas, Venezuela a b wave splitting from SKS data recorded by the national seismic network of Venezuela and a linear
The magmatic plumbing system beneath Santiaguito Volcano, Guatemala Jeannie A.J. Scott a,
Rose, William I.
The magmatic plumbing system beneath Santiaguito Volcano, Guatemala Jeannie A.J. Scott a, , Tamsin, Guatemala City, Guatemala a b s t r a c ta r t i c l e i n f o Article history: Received 9 September 2011 storage Ascent path The silicic dome complex of Santiaguito, Guatemala, has exhibited continuous extrusive
Distinctive upper mantle anisotropy beneath the High Lava Plains and Eastern Snake River Plain,
Distinctive upper mantle anisotropy beneath the High Lava Plains and Eastern Snake River Plain and continuing with the still- ongoing volcanism in the High Lava Plains (HLP) and eastern Snake River Plain (SRP waves; shear wave splitting; high lava plains; Snake River Plain; Yellowstone. Index Terms: 8137
On the vertical extent of the large low shear velocity province beneath the South Pacific Superswell
Barruol, Guilhem
, the southwestern Pacific events recorded by seismic arrays in southeastern Asia sample its western rim [Takeuchi et the western rim to the southern rim of the Pacific LLSVP is proposed as a result of forward modeling [HeOn the vertical extent of the large low shear velocity province beneath the South Pacific
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
A Post-Perovskite Lens and D Heat Flux Beneath the Central Pacific
Garnero, Ed
A Post-Perovskite Lens and Dµ Heat Flux Beneath the Central Pacific Thorne Lay,1 * John Hernlund,2 are attributed to a phase change from perovskite to post-perovskite and then back to perovskite as the temperature increases with depth. Iron enrichment could explain the occurrence of post-perovskite several
Injection of carbon from the shelf to offshore beneath the euphotic zone in the California Current
Balasubramanian, Ravi
Injection of carbon from the shelf to offshore beneath the euphotic zone in the California Current concentrations of chlorophyll are found in the California Current System over 300 km offshore, far from the coast and transported offshore in the meandering California Current jet. Chlorophyll is forced downward
Supplemental Figures Seismic imaging of the laterally varying D" region beneath the Cocos Plate
Garnero, Ed
Supplemental Figures Seismic imaging of the laterally varying D" region beneath the Cocos Plate-474-1882 Fax: 907-474-5618 Email: mthorne@gi.alaska.edu #12;Supplement A. Transverse component velocity.9982 at 80Âº. #12;Supplement B. Transverse component displacement synthetics are shown. Synthetics for PREM
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 ...
Niu, Fenglin
regions on Earth's surface due to the collision from the India plate and the suctions induced seismicity of the area, we conducted a Pn traveltime tomography to estimate the compressive wave speed. In each region, stable blocks tend to have high Pn velocity while the boundary regions, which show a high
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.
Analysis of Fracture in Cores from the Tuff Confining Unit beneath Yucca Flat, Nevada Test Site
Lance Prothro
2008-03-01T23:59:59.000Z
The role fractures play in the movement of groundwater through zeolitic tuffs that form the tuff confining unit (TCU) beneath Yucca Flat, Nevada Test Site, is poorly known. This is an important uncertainty, because beneath most of Yucca Flat the TCU lies between the sources of radionuclide contaminants produced by historic underground nuclear testing and the regional carbonate aquifer. To gain a better understanding of the role fractures play in the movement of groundwater and radionuclides through the TCU beneath Yucca Flat, a fracture analysis focusing on hydraulic properties was performed on conventional cores from four vertical exploratory holes in Area 7 of Yucca Flat that fully penetrate the TCU. The results of this study indicate that the TCU is poorly fractured. Fracture density for all fractures is 0.27 fractures per vertical meter of core. For open fractures, or those observed to have some aperture, the density is only 0.06 fractures per vertical meter of core. Open fractures are characterized by apertures ranging from 0.1 to 10 millimeter, and averaging 1.1 millimeter. Aperture typically occurs as small isolated openings along the fracture, accounting for only 10 percent of the fracture volume, the rest being completely healed by secondary minerals. Zeolite is the most common secondary mineral occurring in 48 percent of the fractures observed.
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
van der Lee, Suzan
beneath southern Africa D. E. James,1 M. J. Fouch,1,2 J. C. VanDecar,1,3 S. van der Lee4 and Kaapvaal Seismic Group5 Abstract. P-wave and S-wave delay times from the broad- band data of the southern Africa in the mantle beneath southern Africa. High velocity mantle roots appear to extend to depths of at least 250 km
Hauser, E.C.
1993-02-01T23:59:59.000Z
A thick sequence of layered rocks occurs beneath the Phanerozoic platform strata which blanket the US midcontinent. Observed on COCORP deep reflection data in southern Illinois and Indiana and in SW Oklahoma and adjacent Texas, this sequence is locally 1--3 times as thick as the overlying Paleozoic cover, but the origin of this sequence and its ultimate lateral extent are unknown. However, the occurrences of Precambrian layered rocks on both the COCORP profiles and reprocessed industry seismic reflection data from the region lie within regions of generally low amplitude and low frequency aeromagnetic anomaly, suggesting an even greater distribution. Unmetamorphosed Precambrian sedimentary rocks have been recovered from drill holes in southwest Ohio and adjacent northern Kentucky and southwesternmost Indiana. These Precambrian sedimentary rocks lie above and may be part of an underlying package of strongly layered rocks imaged on a short and shallow seismic profile in southwest Ohio. These Precambrian sedimentary rocks were originally viewed as part of a late Precambrian (Keweenawan?) rift; however, in light of Grenville foreland structures seen on the COCORP profile to the north in west central Ohio, these Precambrian strata may (1) be part of a heretofore unrecognized Grenville foreland basin, or (2) indicate that unmetamorphosed Precambrian sedimentary material may be an important constituent of the layered rocks observed on COCORP beneath southern Illinois and Indiana.
Stratified precambrian rocks (sedimentary ) beneath the midcontinent region of the US
Hauser, E.C.
1993-02-01T23:59:59.000Z
A thick sequence of layered rocks occurs beneath the Phanerozoic platform strata which blanket the US midcontinent. Observed on COCORP deep reflection data in southern Illinois and Indiana and in SW Oklahoma and adjacent Texas, this sequence is locally 1--3 times as thick as the overlying Paleozoic cover, but the origin of this sequence and its ultimate lateral extent are unknown. However, the occurrences of Precambrian layered rocks on both the COCORP profiles and reprocessed industry seismic reflection data from the region lie within regions of generally low amplitude and low frequency aeromagnetic anomaly, suggesting an even greater distribution. Unmetamorphosed Precambrian sedimentary rocks have been recovered from drill holes in southwest Ohio and adjacent northern Kentucky and southwesternmost Indiana. These Precambrian sedimentary rocks lie above and may be part of an underlying package of strongly layered rocks imaged on a short and shallow seismic profile in southwest Ohio. These Precambrian sedimentary rocks were originally viewed as part of a late Precambrian (Keweenawan ) rift; however, in light of Grenville foreland structures seen on the COCORP profile to the north in west central Ohio, these Precambrian strata may (1) be part of a heretofore unrecognized Grenville foreland basin, or (2) indicate that unmetamorphosed Precambrian sedimentary material may be an important constituent of the layered rocks observed on COCORP beneath southern Illinois and Indiana.
Hauser, E.C. [Cornell Univ., Ithaca, NY (United States)
1992-05-01T23:59:59.000Z
A thick sequence of layered rocks occurs beneath the Phanerozoic platform strata which blanket the U.S. midcontinent. Observed on COCORP deep reflection data in southern Illinois and Indiana and in SW Oklahoma and adjacent Texas, this sequence is locally 1-3 times as thick as the overlying Paleozoic cover, but the origin of this sequence, its ultimate lateral extent, and resource potential are unknown. The objective of this project is to seek and reprocess seismic reflection data provided by industry from the U.S. midcontinent, and together with the COCORP deep reflection data and information from the scattered basement-penetrating drill holes, to begin to constrain the distribution, origin and evolution of this enigmatic layered sequence, particularly to evaluate if sedimentary material may be an important constituent (i.e., deep gas potential).
Hauser, E.C.
1992-01-01T23:59:59.000Z
A thick sequence of layered rocks occurs beneath the Phanerozoic platform strata which blanket the US midcontinent. Observed on COCORP deep reflection data in southern Illinois and Indiana and in SW Oklahoma and adjacent Texas, this sequence is locally 1--3 times as thick as the overlying Paleozoic cover, but the origin of this sequence, its ultimate lateral extent, and resource potential are unknown. The objective of this project is to seek and reprocess seismic reflection data provided by industry from the US midcontinent and together with the COCORP deep reflection data and information from the scattered basement-penetrating drill holes, to begin to constrain the distribution, origin and evolution of this enigmatic layered sequence, particularly to evaluate if sedimentary material may be an important constituent (i.e., deep gas potential).
Hauser, E.C.
1992-06-01T23:59:59.000Z
A thick sequence of layered rocks occurs beneath the Phanerozoic platform strata which blanket the US midcontinent. Observed on COCORP deep reflection data in southern Illinois and Indiana and in SW Oklahoma and adjacent Texas, this sequence is locally 1--3 times as thick as the overlying Paleozoic cover, but the origin of this sequence, its ultimate lateral extent, and resource potential are unknown. The objective of this project is to seek and reprocess seismic reflection data provided by industry from the US midcontinent and together with the COCORP deep reflection data and information from the scattered basement-penetrating drill holes, to begin to constrain the distribution, origin and evolution of this enigmatic layered sequence, particularly to evaluate if sedimentary material may be an important constituent (i.e., deep gas potential).
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.
ten Brink, Uri S.
consisted of two wide-angle seismic reflection and refraction profiles: a 280-km-long profile along vertical 4.5 Hz geophone, buried, and placed at intervals of 0.65Â0.75 km along the profile. The data wereSeismic imaging of deep low-velocity zone beneath the Dead Sea basin and transform fault
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
Scott, Christopher
Groundwatergroundwater Groundwater refers to the saturated layer of Earth's crust extending beneath. The widespread geographical distribution of groundwater and its usually high quality for human consumption and glaciers. The spatial occurrence and quality of groundwater are not uniform, which is the result of geology
Seno, Tetsuzo
Seismic anisotropy in the wedge above the Philippine Sea slab beneath Kanto and southwest Japan generated by shallow and intermediate-depth earthquakes occurring in the subducting Philippine Sea are further divided into PHS1 and PHS2 (upper and lower planes of the double seismic zone in the Philippine
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
Dueker, Ken
P- and S-Wave Receiver Function Images of Crustal Imbrication beneath the Cheyenne Belt estimation to constrain the crustal structure across the ArcheanProterozoic Cheyenne belt suture of Proterozoic lower crust across the Chey- enne belt. Both P and S-wave receiver function images delineate
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
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
, 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
Gao, Stephen Shangxing
beneath southern Africa D. E. James,1M. J. Fouch,1'2J. C. VanDecar, KaapvaalSeismicGroup5 S. van der Lee4 and Abstract. P-wave and S-wavedelay times from the broad- band data of the southern Africa seismicexperiment southern Africa. High velocity mantle roots appear to extend to depths of at least 250 km, and locally
Horton, Duane G.
2007-03-16T23:59:59.000Z
This appendix summarizes historic and recent groundwater data collected from the uppermost aquifer beneath the 200 East and 200 West Areas. Although the area of interest is the Hanford Site Central Plateau, most of the information discussed in this appendix is at the scale of individual single-shell tank waste management areas. This is because the geologic, and thus the hydraulic, properties and the geochemical properties (i.e., groundwater composition) are different in different parts of the Central Plateau.
Dynamic Rupture through a Branched Fault Configuration at Yucca Mountain, and Resulting Ground of Yucca Mountain, Nevada, a potential site for a high-level radioactive waste repository. The Solitario km away from the SCF beneath the crest of Yucca Mountain, causing the repository site to experience
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.
Maxwell, R M; Tompson, A B; Kollet, S J
2008-11-20T23:59:59.000Z
Underground nuclear weapons testing at the Nevada Test Site introduced numerous radionuclides that may be used to characterize subsurface hydrologic transport processes in arid climates. A sixteen year pumping experiment designed to examine radionuclide migration away from the CAMBRIC nuclear test, conducted in groundwater beneath Frenchman Flat in 1965, gave rise to an unintended second experiment involving radionuclide infiltration through the vadose zone, as induced by seepage of pumping effluents beneath an unlined discharge trench. The combined experiments have been reanalyzed using a detailed, three-dimensional numerical model of transient, variably saturated flow and mass transport, tailored specifically for large scale and efficient calculations. Simulations have been used to estimate radionuclide travel and residence times in various parts of the system for comparison with observations in wells. Model predictions of mass transport were able to clearly demonstrate radionuclide recycling behavior between the ditch and pumping well previously suggested by isotopic age dating information; match travel time estimates for radionuclides moving between the ditch, the water table, and monitoring wells; and provide more realistic ways in which to interpret the pumping well elution curves. Collectively, the results illustrate the utility of integrating detailed numerical modeling with diverse observational data in developing accurate interpretations and forecasts of contaminant migration processes.
Sorey, M.L.; Evans, W.C. [U.S. Geological Survey, Menlo Park, California (United States)] Kennedy, B.M. [Lawrence Berkeley National Laboratory, Berkeley, California (United States)] Farrar, C.D. [U.S. Geological Survey, Carnelian Bay, California (United States)] Hainsworth, L.J. [Chemistry Department, Emory and Henry College, Emory, Virginia (United States)] Hausback, B. [Geology Department, California State University, Sacramento
1998-07-01T23:59:59.000Z
Carbon dioxide and helium with isotopic compositions indicative of a magmatic source ({delta}thinsp{sup 13}C={minus}4.5 to {minus}5{per_thousand}, {sup 3}He/{sup 4}He=4.5 to 6.7 R{sub A}) are discharging at anomalous rates from Mammoth Mountain, on the southwestern rim of the Long Valley caldera in eastern California. The gas is released mainly as diffuse emissions from normal-temperature soils, but some gas issues from steam vents or leaves the mountain dissolved in cold groundwater. The rate of gas discharge increased significantly in 1989 following a 6-month period of persistent earthquake swarms and associated strain and ground deformation that has been attributed to dike emplacement beneath the mountain. An increase in the magmatic component of helium discharging in a steam vent on the north side of Mammoth Mountain, which also began in 1989, has persisted until the present time. Anomalous CO{sub 2} discharge from soils first occurred during the winter of 1990 and was followed by observations of several areas of tree kill and/or heavier than normal needlecast the following summer. Subsequent measurements have confirmed that the tree kills arc associated with CO{sub 2} concentrations of 30{endash}90{percent} in soil gas and gas flow rates of up to 31,000 gthinspm{sup {minus}2}thinspd{sup {minus}1} at the soil surface. Each of the tree-kill areas and one area of CO{sub 2} discharge above tree line occurs in close proximity to one or more normal faults, which may provide conduits for gas flow from depth. We estimate that the total diffuse CO{sub 2} flux from the mountain is approximately 520 t/d, and that 30{endash}50 t/d of CO{sub 2} are dissolved in cold groundwater flowing off the flanks of the mountain. Isotopic and chemical analyses of soil and fumarolic gas demonstrate a remarkable homogeneity in composition, suggesting that the CO{sub 2} and associated helium and excess nitrogen may be derived from a common gas reservoir whose source is associated with some combination of magmatic degassing and thermal metamorphism of metasedimentary rocks. Furthermore, N{sub 2}/Ar ratios and nitrogen isotopic values indicate that the Mammoth Mountain gases are derived from sources separate from those that supply gas to the hydrothermal system within the Long Valley caldera. Various data suggest that the Mammoth Mountain gas reservoir is a large, low-temperature cap over an isolated hydrothermal system, that it predates the 1989 intrusion, and that it could remain a source of gas discharge for some time. {copyright} 1998 American Geophysical Union
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
F A S T -T R A C K P A P E R The seismic anomaly beneath Iceland extends down to the mantle
Allen, Richard M.
F A S T - T R A C K P A P E R The seismic anomaly beneath Iceland extends down to the mantle, NJ 08544±5807, USA 4 Meteorological Of®ce of Iceland, Bustadavegi 9, Reykjavik, Iceland 5 National Energy Authority, Grensasvegi 9, Reykjavik, Iceland Accepted 2000 June 15. Received 2000 June 8
F A S T -T R A C K P A P E R The seismic anomaly beneath Iceland extends down to the mantle
Foulger, G. R.
of the upper mantle yet performed in Iceland, which reveals details of the morphology, temperature and melt distribution beneath the Iceland hotspot and the adjacent oceanic plate boundaries. T H E T O M O G R A P H Y E in size. Timing was provided by GPS, and the data were downloaded to SUN workstations. We hand
Moorman, Brian
Interannual Changes in Seasonal Ground Freezing and Near-surface Heat Flow Beneath Bottom-fast Ice Resources Canada, Dartmouth, Nova Scotia, Canada ABSTRACT Interannual changes in seasonal ground freezing. KEY WORDS: seasonal ground freezing; permafrost; bottom-fast ice; Mackenzie Delta INTRODUCTION Arctic
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.
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.
Wright, Dawn Jeannine
, identify geological hazards, and enhance safe and efficient marine transportation." NOAA awarded $5 million of the seafloor along Oregon's coast. Using the latest technologies, they will measure water depth, search from these surveys, we can model tsunamis, identify marine habitats, select alternative energy sites
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
live in the subsurface has informed Scheibe's models of processes such as uranium bioremediation. Iron- and sulfur-reducing microbes such as native Geobacter species interact with...
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.
Dynamic coupling of volcanic CO2 flow and wind at the Horseshoe Lake tree kill, Mammoth Mountain, CA
Lewicki, J.L.; Hilley, G.E.; Tosha, T.; Aoyagi, R.; Yamamoto, K.; Benson, S.M.
2006-01-01T23:59:59.000Z
dioxide beneath Mammoth Mountain, California, Seismol. Res.unrest beneath Mammoth Mountain, California, J. Volcanol.emission at Mammoth Mountain, California, Earth Planet. Sci.
Carol Adair, Elizabeth; Burke, Ingrid C.
2010-01-01T23:59:59.000Z
differences between soil pools beneath B. tectorum adjusteddifferences between soil pools beneath Bonferroni and nativegrass values indicate that pools were estimate statement).
Haszeldine, Stuart
for CCS beneath the UK offshore and onshore: deep geological storage and sequestration of CO2 R Stuart Haszeldine Scottish Centre for Carbon Storage, UKCCSC School of GeoSciences, University of Edinburgh EH9 3JW, the Budget 2006 Report states that CCS is "likely to be a critical technology in global carbon reduction
1999-01-01T23:59:59.000Z
flow beneath the East Pacific Rise. Nature 402, 282285 (1999). 14. Grove, T. L., Kinzler, R. J. & Bryan, W. B. in Mantle Flow and Melt Generation at Mid-Ocean Ridges (eds Morgan, J. P., Blackman, D. K. Dick, H. J. B. in Magmatism in the Ocean Basins (eds Sounders, A. D. & Norry, M. J.) 71105 (Geol. Soc
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
Biosystem Dynamics & Design | EMSL
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Dynamics & Design Overview Atmospheric Aerosol Systems Biosystem Dynamics & Design Energy Materials & Processes Terrestrial & Subsurface Ecosystems Biosystem Dynamics &...
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
Knapp, Camelia Cristina
m), with implications for drilling hazards and seafloor instability. Some of the seismic of the deepwater of the South Caspian Sea, buried deposits well beneath the seafloor, and accordingly, they may drilling hazards, (2) considerable fuel resource for the future, and (3) likely role in global climate
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.
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...
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
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
Dynamic Positioning Simulator Dynamic Positioning Simulator
Vuik, Kees
to the ocean floor, without using anchors accomplished by two or more propulsive devices controlled by inputs Dynamic Positioning: No tugboats needed; Offshore set-up is quick; Power saving; Precision situations more Simulator 11 / 24 #12;Dynamic Positioning Simulator Hydrodynamics Forces on Ship: Wave Force Fwd = CXwd (wd
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...
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...
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
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
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) · Marshall, J., and Plumb, R. A., 2008: Atmosphere, Ocean, and Climate Dynamics: An Introductory Text, Academic Press. · Vallis, G. K
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.
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.
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
2/15/11 2:17 PMFormat Dynamics
Allen, Richard M.
calderas along the Yellowstone Snake River Plain in Idaho -- could be the work of a column of hot rock-mantle plume beneath the Yellowstone Snake River Plain. Underground column of molten rock found at Yellowstone
Nature of Flow and Gas Dynamics Below Spreading Ponds
Clark, Jordan F; Avisar, Dror; Hudson, G. Bryant
2005-01-01T23:59:59.000Z
breakthrough curve at El Rio #8. Pond 2 El Rio #5 El Rio #6Ne and Xe concentrations in Pond 2 and groundwater samples.vadose zone beneath a spreading pond in more detail than was
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.
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.
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
David Merritt
1998-11-06T23:59:59.000Z
A review of elliptical galaxy dynamics, with a focus on nonintegrable models. Topics covered include torus construction; modelling axisymmetric galaxies; triaxiality; collisionless relaxation; and collective instabilities.
Electromagnetic Wave Dynamics in
Kaiser, Robin
Mesoscopic Electromagnetic Wave Dynamics in Ultracold Atomic Gases Robin Kaiser and Mark D. Havey Mesoscopic Electromagnetic Wave Dynamics in Ultracold Atomic Gases #12;39 E xperimental developments permit in the transport proper- ties of electromagnetic radiation in strongly scattering random media. Even in weakly
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...
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...
Neil Dobbs; Mikko Stenlund
2015-04-08T23:59:59.000Z
We introduce the notion of a quasistatic dynamical system, which generalizes that of an ordinary dynamical system. Quasistatic dynamical systems are inspired by the namesake processes in thermodynamics, which are idealized processes where the observed system transforms (infinitesimally) slowly due to external influence, tracing out a continuous path of thermodynamic equilibria over an (infinitely) long time span. Time-evolution of states under a quasistatic dynamical system is entirely deterministic, but choosing the initial state randomly renders the process a stochastic one. In the prototypical setting where the time-evolution is specified by strongly chaotic maps on the circle, we obtain a description of the statistical behaviour as a stochastic diffusion process, under surprisingly mild conditions on the initial distribution, by solving a well-posed martingale problem. We also consider various admissible ways of centering the process, with the curious conclusion that the "obvious" centering suggested by the initial distribution sometimes fails to yield the expected diffusion.
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.
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.
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
, and accurately determine the position of, cracks. The nondestructive testing of a solid to detect such flaws as the fluid coupling tends to zero is nonuniform, that is, the Rayleigh wave is not related to the Sch
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
MMS 2007-035 Seafloor Characteristics and Distribution
Mathis, Wayne N.
of the continuing expansion of oil and gas activities into the deep Gulf of Mexico (GoM), there is a crucial need t and Other Sessile Megafauna at Two Upper-Slope Sites in the Northeastern Gulf of Mexico U.S. Department of the Interior Minerals Management Service Gulf of Mexico OCS Region #12;U.S. Department of the Interior Minerals
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...
Abiotic Oxidation Rate of Chalcopyrite: Implications for Seafloor Mining
Bilenker, Laura Danielle
2011-01-01T23:59:59.000Z
the pump on this lowest usable setting minimized wear on thepump head was shifted once over the course of the run to prevent wear,
Numerical Modeling of Seafloor Interation with Steel Catenary Riser
You, Jung Hwan
2012-10-19T23:59:59.000Z
, and moment. Primary outputs from this model include the deflected shape of the riser pipe and bending moments along riser length. The code also provides the location of maximum trench depth and the position where the maximum bending moment occurs and any...
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:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article)41clothThe Bonneville PowerTariff Pages default SignEnergy Michigan: General Motors
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...
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.
Goldfinger, Chris
for Oregon And Washington Version 1.0 Chris Goldfinger Chris Romsos Rondi Robison Randall Milstein Beth Myers for the Oregon and Washington continental margin. The project expands on one recently completed for the Oregon and Washington continental shelves and margins, incorporating many important new datasets collected since
Dynamical laser spike processing
Shastri, Bhavin J; Tait, Alexander N; Rodriguez, Alejandro W; Wu, Ben; Prucnal, Paul R
2015-01-01T23:59:59.000Z
Novel materials and devices in photonics have the potential to revolutionize optical information processing, beyond conventional binary-logic approaches. Laser systems offer a rich repertoire of useful dynamical behaviors, including the excitable dynamics also found in the time-resolved "spiking" of neurons. Spiking reconciles the expressiveness and efficiency of analog processing with the robustness and scalability of digital processing. We demonstrate that graphene-coupled laser systems offer a unified low-level spike optical processing paradigm that goes well beyond previously studied laser dynamics. We show that this platform can simultaneously exhibit logic-level restoration, cascadability and input-output isolation---fundamental challenges in optical information processing. We also implement low-level spike-processing tasks that are critical for higher level processing: temporal pattern detection and stable recurrent memory. We study these properties in the context of a fiber laser system, but the addit...
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.
Statistics of football dynamics
Mendes, R S; Anteneodo, C
2007-01-01T23:59:59.000Z
We investigate the dynamics of football matches. Our goal is to characterize statistically the temporal sequence of ball movements in this collective sport game, searching for traits of complex behavior. Data were collected over a variety of matches in South American, European and World championships throughout 2005 and 2006. We show that the statistics of ball touches presents power-law tails and can be described by $q$-gamma distributions. To explain such behavior we propose a model that provides information on the characteristics of football dynamics. Furthermore, we discuss the statistics of duration of out-of-play intervals, not directly related to the previous scenario.
Introduction to Accelerated Molecular Dynamics
Perez, Danny [Los Alamos National Laboratory
2012-07-10T23:59:59.000Z
Molecular Dynamics is the numerical solution of the equations of motion of a set of atoms, given an interatomic potential V and some boundary and initial conditions. Molecular Dynamics is the largest scale model that gives unbiased dynamics [x(t),p(t)] in full atomistic detail. Molecular Dynamics: is simple; is 'exact' for classical dynamics (with respect to a given V); can be used to compute any (atomistic) thermodynamical or dynamical properties; naturally handles complexity -- the system does the right thing at the right time. The physics derives only from the interatomic potential.
(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
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
LABORATORY VI ROTATIONAL DYNAMICS
Minnesota, University of
Lab VI - 1 LABORATORY VI ROTATIONAL DYNAMICS So far this semester, you have been asked to think kinematics. OBJECTIVES: Successfully completing this laboratory should enable you to: · Use linear kinematics in a laboratory on earth, before launching the satellite. EQUIPMENT You will use an apparatus that spins
Singhose, William
Journal of Dynamic Systems, Measurement, and Control Technical Briefs Remote Vibration Control for Flexible Beams Subject to Harmonic Disturbances Shang-Teh Wu Department of Mechanical Engineering, National at the boundary are required in the control algorithm, which emulates the behavior of a set of mechanical spring
New Approaches in Embedded Networked Sensing for Terrestrial Ecological Observatories
2007-01-01T23:59:59.000Z
methods for measuring energy dynamics beneath vege- tation canopies using either measured or estimated solar and thermal
Biological Interactions and Dynamics Workshop | EMSL
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Biological Interactions and Dynamics Workshop Biological Interactions and Dynamics Workshop Wiley HS, Kaplan S. 2011. "Biological Interactions and Dynamics Science Theme Advisory...
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 ...
Entanglement dynamics in chaotic systems
Ghose, Shohini [Institute for Quantum Information Science, University of Calgary, Alberta, T2N 1N4 (Canada); Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131 (United States); Sanders, Barry C. [Institute for Quantum Information Science, University of Calgary, Alberta, T2N 1N4 (Canada); Centre for Quantum Computer Technology, Macquarie University, Sydney, New South Wales (Australia)
2004-12-01T23:59:59.000Z
We study quantum chaos for systems with more than one degree of freedom, for which we present an analysis of the dynamics of entanglement. Our analysis explains the main features of entanglement dynamics and identifies entanglement-based signatures of quantum chaos. We discuss entanglement dynamics for a feasible experiment involving an atom in a magneto-optical trap and compare the results with entanglement dynamics for the well-studied quantum kicked top.
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
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
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
ANALYSING DYNAMIC FUNCTION SCHEDULING DECISIONS
Harrison, Michael
, University of York, York YO10 5DD, UK Abstract: Function allocation, as a process used in the construction, the notion of dynamic function allocation becomes increasingly desirable where in certain situations of dynamic function allocation that reflects typical work activity where the dynamic scheduling of activities
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
Nonlinear chemical dynamics Francesc Sagusa
Epstein, Irving R.
Nonlinear chemical dynamics Francesc Saguésa and Irving R. Epsteinb a Departament de Química Física March 2003 The interdisciplinary field of nonlinear chemical dynamics has grown significantly in breadth an overview of some of the key results of nonlinear chemical dynamics, with emphasis on those areas most
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.
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 August Jr. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
2014-10-14T23:59:59.000Z
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.
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
Characterizing Microbial Community and Geochemical Dynamics at...
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Microbial Community and Geochemical Dynamics at Hydrothermal Vents Using Osmotically Driven Continuous Fluid Characterizing Microbial Community and Geochemical Dynamics at...
Emery, V.J. [Brookhaven National Lab., Upton, NY (United States); Kivelson, S.A. [California Univ., Los Angeles, CA (United States). Dept. of Physics
1993-12-31T23:59:59.000Z
In the past few years there has been a resurgence of interest in dynamical impurity problems, as a result of developments in the theory of correlated electron systems. The general dynamical impurity problem is a set of conduction electrons interacting with an impurity which has internal degrees of freedom. The simplest and earliest example, the Kondo problem, has attracted interest since the mid-sixties not only because of its physical importance but also as an example of a model displaying logarithmic divergences order by order in perturbation theory. It provided one of the earliest applications of the renormalization group method, which is designed to deal with just such a situation. As we shall see, the antiferromagnetic Kondo model is controlled by a strong-coupling fixed point, and the essence of the renormalization group solution is to carry out the global renormalization numerically starting from the original (weak-coupling) Hamiltonian. In these lectures, we shall describe an alternative route in which we identify an exactly solvable model which renormalizes to the same fixed point as the original dynamical impurity problem. This approach is akin to determining the critical behavior at a second order phase transition point by solving any model in a given universality class.
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.
Susmita Roy; Subramanian Yashonath; Biman Bagchi
2015-01-08T23:59:59.000Z
A self-consistent mode coupling theory (MCT) with microscopic inputs of equilibrium pair correlation functions is developed to analyze electrolyte dynamics. We apply the theory to calculate concentration dependence of (i) time dependent ion diffusion, (ii) dynamic structure factor of the constituent ions, and (iii) ion solvation dynamics in electrolyte solution. Brownian dynamics (BD) with implicit water molecules and molecular dynamics (MD) method with explicit water are used to check the theoretical predictions. The time dependence of ionic self-diffusion coefficient and the corresponding dynamic structure factor evaluated from our MCT approach show quantitative agreement with early experimental and present Brownian dynamic simulation results. With increasing concentration, the dispersion of electrolyte friction is found to occur at increasingly higher frequency, due to the faster relaxation of the ion atmosphere. The wave number dependence of total dynamic structure factor F(k,t), exhibits markedly different relaxation dynamics at different length scales. At small wave numbers, we find the emergence of a step-like relaxation, indicating the presence of both fast and slow time scales in the system. Such behaviour allows an intriguing analogy with temperature dependent relaxation dynamics of supercooled liquids. We find that solvation dynamics of a tagged ion exhibits a power law decay at long times- the decay can also be fitted to a stretched exponential form. The emergence of the power law in solvation dynamics has been tested by carrying out long Brownian dynamics simulations with varying ionic concentrations. This solvation time correlation and ion-ion dynamic structure factor indeed exhibits highly interesting, non-trivial dynamical behaviour at intermediate to longer times that require further experimental and theoretical studies.
Knoll, Jörn
) - Upot, f mean field = C(f(x, p, t)) Collision Term = p2 2m - Upot(x, p) dp1dp2dp3 d d (1 - f)f1(1 - f2, t)) Collision Term = p2 2m - Upot(x, p) dp1dp2dp3 d d (1 - f)f1(1 - f2)f3 + loss term. Voskresensky1,3 1GSI 2Kurchatov Inst. (Moscow) 3Moscow Ins. for Physics and Engineering #12;Dynamics
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AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankShale_Gas.pdfService onviiiDepartment of Energy 09CooledDiversityDormAgendaDHome1Dynamic Windows
Protein Dynamics and Biocatalysis
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AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5(Million Cubic Feet) Oregon (Including Vehicle Fuel) (Million Cubic Feet)setsManagement ProgramProofreadingProprietary Research3ProteinProtein Dynamics
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.
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 ?".
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.
Ledvina, Andrew, E-mail: aledvina@princeton.edu; Sircar, Ronnie, E-mail: sircar@princeton.ed [Princeton University, ORFE Department (United States)
2011-02-15T23:59:59.000Z
We study continuous time Bertrand oligopolies in which a small number of firms producing similar goods compete with one another by setting prices. We first analyze a static version of this game in order to better understand the strategies played in the dynamic setting. Within the static game, we characterize the Nash equilibrium when there are N players with heterogeneous costs. In the dynamic game with uncertain market demand, firms of different sizes have different lifetime capacities which deplete over time according to the market demand for their good. We setup the nonzero-sum stochastic differential game and its associated system of HJB partial differential equations in the case of linear demand functions. We characterize certain qualitative features of the game using an asymptotic approximation in the limit of small competition. The equilibrium of the game is further studied using numerical solutions. We find that consumers benefit the most when a market is structured with many firms of the same relative size producing highly substitutable goods. However, a large degree of substitutability does not always lead to large drops in price, for example when two firms have a large difference in their size.
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.
Algorithms for dynamical overlap fermions
Stefan Schaefer
2006-09-28T23:59:59.000Z
An overview of the current status of algorithmic approaches to dynamical overlap fermions is given. In particular the issue of changing the topological sector is discussed.
LANL | Physics | Dynamic Plutonium Experiments
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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...
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.
Los Alamos Dynamics Summer School
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School Los Alamos Dynamics Summer School Overview Contact Institute Director Charles Farrar (505) 663-5330 Email Professional Staff Assistant Jutta Kayser (505) 663-5649 Email...
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.
Umar, A S; Simenel, C
2015-01-01T23:59:59.000Z
For light and medium mass systems the capture cross-section may be considered to be the same as that for complete fusion, whereas for heavy systems leading to superheavy formations the evaporation residue cross-section is dramatically reduced due to the quasifission (QF) and fusion-fission processes thus making the capture cross-section to be essentially the sum of these two cross-sections, with QF occurring at a much shorter time-scale. Consequently, quasifission is the primary reaction mechanism that limits the formation of superheavy nuclei. Within the last few years the time-dependent Hartree-Fock (TDHF) approach has been utilized for studying the dynamics of quasifission. The study of quasifission is showing a great promise to provide insight based on very favorable comparisons with experimental data. In this article we will focus on the TDHF calculations of quasifission observables for the $^{48}$Ca+$^{249}$Bk system.
Stormo, Keith E. (Moscow, ID)
1996-07-02T23:59:59.000Z
A dynamic bed reactor is disclosed in which a compressible open cell foam matrix is periodically compressed and expanded to move a liquid or fluid through the matrix. In preferred embodiments, the matrix contains an active material such as an enzyme, biological cell, chelating agent, oligonucleotide, adsorbent or other material that acts upon the liquid or fluid passing through the matrix. The active material may be physically immobilized in the matrix, or attached by covalent or ionic bonds. Microbeads, substantially all of which have diameters less than 50 microns, can be used to immobilize the active material in the matrix and further improve reactor efficiency. A particularly preferred matrix is made of open cell polyurethane foam, which adsorbs pollutants such as polychlorophenol or o-nitrophenol. The reactors of the present invention allow unidirectional non-laminar flow through the matrix, and promote intimate exposure of liquid reactants to active agents such as microorganisms immobilized in the matrix.
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...
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.
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.
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.
Dynamic Coupling Measurement for Object-
Bae, Doo-Hwan
Dynamic Coupling Measurement for Object- Oriented Software Dynamic Coupling Measurement for Object- Oriented SoftwareErik Arisholm, Lionel C. Briand, Audun Foyen IEEE Transaction on Software Engineering/2)Introduction (1/2) Extensive research related to quality of OO software has performed Define structural metrics
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
Rowland, Joel C [Los Alamos National Laboratory; Hilley, George E [STANFORD UNIV; Fildani, Andrea [CHEVRON ETC
2009-01-01T23:59:59.000Z
Leveed submarine channels play a critical role in the transfer of sediment from the upper continental slopes to interslope basins and ultimately deepwater settings. Despite a reasonable understanding of how these channels grow once established, how such channels initiate on previously unchannelized portions of the seafloor remains poorly understood. We conducted a series of experiments that elucidate the influence of excess density relative to flow velocity on the dynamics of, and depositional morphologies arising from, density currents undergoing sudden unconfinement across a sloped bed. Experimental currents transported only suspended sediment across a non-erodible substrate. Under flow conditions ranging from supercritical to subcritical (bulk Richardson numbers of 0.02 to 1.2) our experiments failed to produce deposits resembling or exhibiting the potential to evolve into self-formed leveed channels. In the absence of excess density, a submerged sediment-laden flow produced sharp crested lateral deposits bounding the margins of the flow for approximately a distance of two outlet widths down basin. These lateral deposits terminated in a centerline deposit that greatly exceeded marginal deposits in thickness. As excess density increased relative to the outlet velocity, the rate of lateral spreading of the flow increased relative to the downstream propagation of the density current, transitioning from a narrow flow aligned with the channel outlet to a broad radially expanding flow. Coincident with these changes in flow dynamics, the bounding lateral deposits extended for shorter distances, had lower, more poorly defined crests that were increasingly wider in separation than the initial outlet, and progressively became more oblong rather than linear. Based on our results, we conclude that leveed channels cannot initiate from sediment-laden density currents under strictly depositional conditions. Partial confinement of these currents appears to be necessary to establish the hydrodynamic conditions needed for sediment deposition along the margins of a density current which ultimately may evolve into confining levees. We suggest that erosion into a previously unchannelized substrate is the mostly likely source of this partial confinement.
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.
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
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.
Molecular dynamics simulation of threshold displacement energies...
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simulation of threshold displacement energies in zircon. Molecular dynamics simulation of threshold displacement energies in zircon. Abstract: Molecular-dynamics simulations were...
Laser Driven Dynamic Loading of Condensed Matter
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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...
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Charge Distribution, and Electron Hopping Dynamics in Magnetite (Fe3O4) (100) Surfaces from First Principles. Structure, Charge Distribution, and Electron Hopping Dynamics in...
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 ...
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.
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.
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).
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.
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.
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).
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.
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...
Dynamical Mutation of Dark Energy
L. R. Abramo; R. C. Batista; L. Liberato; R. Rosenfeld
2008-01-03T23:59:59.000Z
We discuss the intriguing possibility that dark energy may change its equation of state in situations where large dark energy fluctuations are present. We show indications of this dynamical mutation in some generic models of dark energy.
Dynamical mutation of dark energy
Abramo, L. R.; Batista, R. C. [Instituto de Fisica, Universidade de Sao Paulo, CP 66318, 05315-970, Sao Paulo (Brazil); Liberato, L.; Rosenfeld, R. [Instituto de Fisica Teorica, Universidade Estadual Paulista, R. Pamplona 145, 01405-900, Sao Paulo (Brazil)
2008-03-15T23:59:59.000Z
We discuss the intriguing possibility that dark energy may change its equation of state in situations where large dark energy fluctuations are present. We show indications of this dynamical mutation in some generic models of dark energy.
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.
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 ...
Abstract Machines for Dynamic Computation
Walton, Christopher D
In this thesis we address the challenges associated with the provision of dynamic software architectures. These are systems in which programs are constructed from separately compiled units with a facility for the replacement ...
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.
Essays in dynamic general equilibrium
Cao, Dân (Dân Vu?)
2010-01-01T23:59:59.000Z
This thesis consists of three chapters studying dynamic economies in general equilibrium. The first chapter considers an economy in business cycles with potentially imperfect financial markets. The second chapter investigates ...
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.
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.
Dynamical Crossover in Supercritical Water
Yu. D. Fomin; V. N. Ryzhov; E. N. Tsiok; V. V. Brazhkin
2015-02-10T23:59:59.000Z
Dynamical crossover in water is studied by means of computer simulation. The crossover temperature is calculated from the behavior of velocity autocorrelation functions. The results are compared with experimental data. It is shown that the qualitative behavior of the dynamical crossover line is similar to the melting curve behavior. Importantly, the crossover line belongs to experimentally achievable $(P,T)$ region which stimulates the experimental investigation in this field.
Peak mass and dynamical friction
A. Del Popolo; M. Gambera
1995-06-09T23:59:59.000Z
We show how the results given by several authors relatively to the mass of a density peak are changed when small scale substructure induced by dynamical friction are taken into account. The peak mass obtained is compared to the result of Peacock \\& Heavens (1990) and to the peak mass when dynamical friction is absent to show how these effects conspire to reduce the mass accreted by the peak.
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
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
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
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.
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.
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...
Dynamics of Triaxial Stellar Systems
David Merritt
1996-11-11T23:59:59.000Z
Recent work on the dynamics of triaxial stellar systems is reviewed. The motion of boxlike orbits in realistic triaxial potentials is generically stochastic. The degree to which the stochasticity manifests itself in the dynamics depends on the chaotic mixing timescale, which is a small multiple of the crossing time in triaxial models with steep cusps or massive central singularities. Low-luminosity ellipticals, which have the steepest cusps and the shortest dynamical times, are less likely than bright ellipticals to have strongly triaxial shapes. The observational evidence for triaxiality is reviewed; departures from axisymmetry in early-type galaxies are often found to be associated with evidence of recent interactions or with the presence of a bar.
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.
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)
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.
Accelerator dynamics and beam aperture
Parsa, Z.
1986-10-01T23:59:59.000Z
We present an analytical method for analyzing accelerator dynamics, including higher order effects of multipoles on the beam. This formalism provides a faster alternative to particle tracking. Simplectic expressions for the emittance and phase describing the dynamical behavior of a particle in a circular accelerator are derived using second order perturbation theory (in the presence of nonlinear elements, e.g., sextupoles, octupoles). These expressions are successfully used to calculate the emittance growth, smear and linear aperture. Our findings compare well with results obtained from tracking programs. In addition perturbation to betatron tune; resonance strengths; stop bandwidth; fixed points; island width; and Chirikov criteria are calculated.
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.
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.
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.
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.
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
Critical phenomena in evolutionary dynamics
Manapat, Michael L. (Michael Linn)
2010-01-01T23:59:59.000Z
This thesis consists of five essays on evolutionary dynamics. In Chapters 1 and 2, we study the evolution of trust from the perspective of game theory. In the trust game, two players have a chance to win a sum of money. ...
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.
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.
Modeling Blog Dynamics Michaela Gotz
Leskovec, Jure
Modeling Blog Dynamics Michaela G¨otz Cornell University goetz@cs.cornell.edu Jure Leskovec@cs.cmu.edu Christos Faloutsos Carnegie Mellon University christos@cs.cmu.edu Abstract How do blogs produce posts? What local, underlying mech- anisms lead to the bursty temporal behaviors observed in blog networks? Earlier
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 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.
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
BFKL dynamics at hadron colliders
Carlo Ewerz; Lynne H. Orr; W. James Stirling; Bryan R. Webber
1999-12-22T23:59:59.000Z
Hadron colliders can provide important tests of BFKL `small-x' dynamics. We discuss two examples of such tests, the inclusive dijet jet cross section at large rapidity separation and the number of associated `mini-jets' in Higgs boson production.
Parameter and state estimation in nonlinear dynamical systems
Creveling, Daniel R.
2008-01-01T23:59:59.000Z
and J. Kurths. Nonlinear dynamical system identi?ca- tionEstimation In Nonlinear Dynamical Systems A dissertationState Estimation In Nonlinear Dynamical Systems by Daniel R.
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...
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...
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 Algorithm for Space Weather Forecasting System
Fischer, Luke D.
2011-08-08T23:59:59.000Z
We propose to develop a dynamic algorithm that intelligently analyzes existing solar weather data and constructs an increasingly more accurate equation/algorithm for predicting solar weather accurately in real time. This dynamic algorithm analyzes a...
Dynamic Operational Risk Assessment with Bayesian Network
Barua, Shubharthi
2012-10-19T23:59:59.000Z
equipment/component on others. The developed Bayesian network is then extended to the dynamic Bayesian network to demonstrate dynamic operational risk assessment. A case study on a holdup tank problem is provided to illustrate the application of the method...
Mapping molecular dynamics computations to hypercubes
Lakamsani, Vamsee Krishna
1993-01-01T23:59:59.000Z
This thesis proposes an approach for systematic modeling, mapping and performance analysis of a Grand Challenge application problem in computational biology called Molecular Dynamics Simulation of Proteins. Molecular Dynamics (MD) is an important...
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
Improving network routing performance in dynamic environments
Liu, Yong
2007-04-25T23:59:59.000Z
In this dissertation, we study methods for improving the routing performance of computer communication networks in dynamic environments. The dynamic environments we considered in this work include both network topology ...
Finding Bugs In Dynamic Web Applications
Artzi, Shay
2008-02-06T23:59:59.000Z
Web script crashes and malformed dynamically-generated web pages are common errors, and they seriously impact usability of web applications. Currenttools for web-page validation cannot handle the dynamically-generatedpages ...
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 ...
Mathematics 658 Nonlinear Dynamics and Geometic Mechanics
Bloch, Anthony
Mathematics 658 Nonlinear Dynamics and Geometic Mechanics Instructor: Anthony M. Bloch. Office of ordinary differential equations and dynamical systems, with applications to various mechanical and physical geometry, nonlinear stability theory, Lagrangian and Hamiltonian mechanics, integrable systems, reduction
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
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.
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.
Molecular dynamics simulation studies of electrolytes andelectrolyte...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
studies of electrolytes and electrolyteelectrode interfaces Molecular dynamics simulation studies of electrolytes and electrolyteelectrode interfaces 2009 DOE Hydrogen Program...
FORMULATIONS FOR DYNAMIC LOT SIZING WITH SERVICE ...
2012-05-08T23:59:59.000Z
Late shipments can be extremely disruptive to downstream businesses and ... In a dynamic environment, especially with seasonality and fluctuating energy ...
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
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
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
Geometric control and dynamical systems Ludovic Rifford
Rifford, Ludovic
Geometric control and dynamical systems Ludovic Rifford Universit´e de Nice - Sophia Antipolis Equations and Applications Ludovic Rifford Geometric control and dynamical systems #12;Control of an inverted pendulum Ludovic Rifford Geometric control and dynamical systems #12;Control systems A general
LANGUAGE LEARNING AND NONLINEAR DYNAMICAL SYSTEMS
Andrews, Mark W.
LANGUAGE LEARNING AND NONLINEAR DYNAMICAL SYSTEMS A Dissertation Presented to the Faculty LEARNING AND NONLINEAR DYNAMICAL SYSTEMS Mark William Andrews, Ph.D. Cornell University 2003 The thesis be provided by an better appreciation of the capacities of nonlinear dynamical systems to learn, rep- resent
Computability and Dynamical Systems: a Perspective
Graça, Daniel S.
Computability and Dynamical Systems: a Perspective Daniel S. Gra¸ca SQIG - IT and DM In this paper we look at dynamical systems from a computability per- spective. We survey some topics and themes of research for dynamical systems and then see how they can be fitted in a computational frame- work. We
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.
Resource Management for Dynamic Reconfigurable Hardware Structures
Huss, Sorin A.
Resource Management for Dynamic Reconfigurable Hardware Structures Andreas K¨uhn, Felix Madlener|madlener|huss}@iss.tu-darmstadt.de Abstract-- Garbage-Collection for reconfigurable hardware systems is another step to make dynamic reconfigurable hardware usable. By now, dynamic reconfiguration of FPGAs is still based on common hardware design
Composition of Dynamic Analysis Aspects Eric Tanter
Binder, Walter
Composition of Dynamic Analysis Aspects ´Eric Tanter PLEIAD Laboratory Computer Science Department thanks to recent advances in exhaustive weaving in core libraries. Casting dynamic analyses as aspects, simultaneously. However, even if dynamic analysis as- pects are mutually independent, their mere presence
Zevenhoven, Ron
Introduction to Computational Fluid Dynamics 424512 E #1 - rz Introduction to Computational Fluid Dynamics (iCFD) 424512.0 E, 5 sp 1. Introduction; Fluid dynamics (lecture 1 of 4) Ron Zevenhoven Åbo to Computational Fluid Dynamics 424512 E #1 - rz maj 2015 Åbo Akademi Univ - Thermal and Flow Engineering
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 on applications of nonlinear functional analysis to dynamical systems are briefly reviewed. Special emphasis consists of three parts. In Part 1 we introduce some basic concepts in dynamical systems, including limit
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
Dynamic Logics of Dynamical Systems ANDR E PLATZER, Carnegie Mellon University
Platzer, AndrÃ©
. Dynamical systems are mathematical models describing how the state of a system evolves over time. They are important for modeling and understanding many applications, including embedded systems and cyber of differential equations. We explain the dynamical system models, dynamic logics of dynamical systems
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
Control algorithms for dynamic attenuators
Hsieh, Scott S., E-mail: sshsieh@stanford.edu [Department of Radiology, Stanford University, Stanford, California 94305 and Department of Electrical Engineering, Stanford University, Stanford, California 94305 (United States); Pelc, Norbert J. [Department of Radiology, Stanford University, Stanford California 94305 and Department of Bioengineering, Stanford University, Stanford, California 94305 (United States)] [Department of Radiology, Stanford University, Stanford California 94305 and Department of Bioengineering, Stanford University, Stanford, California 94305 (United States)
2014-06-15T23:59:59.000Z
Purpose: The authors describe algorithms to control dynamic attenuators in CT and compare their performance using simulated scans. Dynamic attenuators are prepatient beam shaping filters that modulate the distribution of x-ray fluence incident on the patient on a view-by-view basis. These attenuators can reduce dose while improving key image quality metrics such as peak or mean variance. In each view, the attenuator presents several degrees of freedom which may be individually adjusted. The total number of degrees of freedom across all views is very large, making many optimization techniques impractical. The authors develop a theory for optimally controlling these attenuators. Special attention is paid to a theoretically perfect attenuator which controls the fluence for each ray individually, but the authors also investigate and compare three other, practical attenuator designs which have been previously proposed: the piecewise-linear attenuator, the translating attenuator, and the double wedge attenuator. Methods: The authors pose and solve the optimization problems of minimizing the mean and peak variance subject to a fixed dose limit. For a perfect attenuator and mean variance minimization, this problem can be solved in simple, closed form. For other attenuator designs, the problem can be decomposed into separate problems for each view to greatly reduce the computational complexity. Peak variance minimization can be approximately solved using iterated, weighted mean variance (WMV) minimization. Also, the authors develop heuristics for the perfect and piecewise-linear attenuators which do not requirea priori knowledge of the patient anatomy. The authors compare these control algorithms on different types of dynamic attenuators using simulated raw data from forward projected DICOM files of a thorax and an abdomen. Results: The translating and double wedge attenuators reduce dose by an average of 30% relative to current techniques (bowtie filter with tube current modulation) without increasing peak variance. The 15-element piecewise-linear dynamic attenuator reduces dose by an average of 42%, and the perfect attenuator reduces dose by an average of 50%. Improvements in peak variance are several times larger than improvements in mean variance. Heuristic control eliminates the need for a prescan. For the piecewise-linear attenuator, the cost of heuristic control is an increase in dose of 9%. The proposed iterated WMV minimization produces results that are within a few percent of the true solution. Conclusions: Dynamic attenuators show potential for significant dose reduction. A wide class of dynamic attenuators can be accurately controlled using the described methods.
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.
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.
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 ...
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.
Gate complexity using Dynamic Programming
Srinivas Sridharan; Mile Gu; Matthew R. James
2008-07-03T23:59:59.000Z
The relationship between efficient quantum gate synthesis and control theory has been a topic of interest in the quantum control literature. Motivated by this work, we describe in the present article how the dynamic programming technique from optimal control may be used for the optimal synthesis of quantum circuits. We demonstrate simulation results on an example system on SU(2), to obtain plots related to the gate complexity and sample paths for different logic gates.
Dynamic load balancing of applications
Wheat, Stephen R. (Albuquerque, NM)
1997-01-01T23:59:59.000Z
An application-level method for dynamically maintaining global load balance on a parallel computer, particularly on massively parallel MIMD computers. 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.
Dynamic Windows | Department of Energy
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE: AlternativePerformanceDecember 2013State |Audit Report:Don't LetBatteryDuctsDynamic Windows
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 ...
Integrability in the mesoscopic dynamics
Artur Sowa
2004-09-12T23:59:59.000Z
The Mesoscopic Mechanics (MeM), which has been introduced in a previous paper, is relevant to the electron gas confined to two spatial dimensions. It predicts a special way of collective response of correlated electrons to the external magnetic field. The dynamic variable of this theory is a finite-dimensional operator, which is required to satisfy the mesoscopic Schr\\"{o}dinger equation (cf. text). In this article, we describe general solutions of the mesoscopic Schr\\"{o}dinger equation. Our approach is specific to the problem at hand. It relies on the unique structure of the equation and makes no reference to any other techniques, with the exception of the geometry of unitary groups. In conclusion, a surprising fact comes to light. Namely, the mesoscopic dynamics "filters" through the (microscopic) Schr\\"odinger dynamics as the latter turns out to be a clearly separable part, in fact an autonomous factor, of the evolution. This is a desirable result also from the physical standpoint.
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.
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.
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).
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.
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:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports to3,1,50022,3,,0,,6,1,Separation 23Tribal EnergyCatalytic Co - PA 40 FUSRAPChupadera MesaFR0t-kDOE F5u.s. Department of theDATA
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.
Hele, Timothy J. H.; Willatt, Michael J.; Muolo, Andrea; Althorpe, Stuart C.
2015-01-01T23:59:59.000Z
drastic than it first appears, is that both CMD and RPMD give qualitatively wrong fluctuation dynamics at barriers. In Matsubara dynamics, some of the distributions in q(?) stretch indefinitely over the barrier top, such that a proportion... , we define CAB(t) without the factor of 1/Z (where Z is the quantum partition function). 9To simplify the algebra, we assume that the system is one-dimensional, and that Aˆ and Bˆ are functions of qˆ. Matsubara dynamics generalizes straightforwardly...
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.
Simulations with dynamical HISQ quarks
A. Bazavov; C. Bernard; C. DeTar; W. Freeman; Steven Gottlieb; U. M. Heller; J. E. Hetrick; J. Laiho; L. Levkova; M. Oktay; J. Osborn; R. L. Sugar; D. Toussaint; R. S. Van de Water
2010-12-06T23:59:59.000Z
We report on the status of a program of generating and using configurations with four flavors of dynamical quarks, using the HISQ action. We study the lattice spacing dependence of physical quantities in these simulations, using runs at several lattice spacings, but with the light quark mass held fixed at two tenths of the strange quark mass. We find that the lattice artifacts in the HISQ simulations are much smaller than those in the asqtad simulations at the same lattice spacings and quark masses. We also discuss methods for setting the scale, or assigning a lattice spacing to ensembles run at unphysical parameters.
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.
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.
Lagrangian continuum dynamics in ALEGRA.
Wong, Michael K. W.; Love, Edward
2007-12-01T23:59:59.000Z
Alegra is an ALE (Arbitrary Lagrangian-Eulerian) multi-material finite element code that emphasizes large deformations and strong shock physics. The Lagrangian continuum dynamics package in Alegra uses a Galerkin finite element spatial discretization and an explicit central-difference stepping method in time. The goal of this report is to describe in detail the characteristics of this algorithm, including the conservation and stability properties. The details provided should help both researchers and analysts understand the underlying theory and numerical implementation of the Alegra continuum hydrodynamics algorithm.
Dynamically Responsive Infrared Window Coatings
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
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Los Alamos Dynamics Summer School
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
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Dynamic Engineering | Open Energy Information
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on DeliciousPlasmaP aCentrothermDepew, New York: Energy ResourcesDowney,Dyer County, Tennessee: Energy ResourcesDynamic
Viral BLIP dynamics during HAART.
Markowitz, M.; Louie, M. (Michael); Hurley, A. (Arlene); Ho, David D.; Perelson, Alan S.,; Di Mascio, M. (Michele)
2001-01-01T23:59:59.000Z
Intermittent episodes of low-level viremia (blips) are often observed in well-suppressed, HAART-treated patients. It has been reported that viral blips do not correlate with the emergence of new HAART-related mutations; however, increased frequency of blips correlates with slower decay of latently infected cells. Since blips are transient and unpredictable, detailed knowledge about them is difficult to obtain. We present an analysis of the dynamics of viral blips from viral load (VL) measurements on 123 patients for a period of 809k480d (21-1817d) and sampled every 31{+-}12d for a total of 26{+-}15 samples per patient.
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.
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 on Google Bookmark EERE: Alternative Fuels Data Center Home Page onsource History View New PagessourceRavenandEconomies |Information Texas's 27thView NewStrategy |Look at the 4 May
Evidence For Gas And Magmatic Sources Beneath The Yellowstone Volcanic
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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...
Connotation Lexicon: A Dash of Sentiment Beneath the Surface Meaning
Anderson, Richard
of sentiment beyond denotative or surface meaning of text. For instance, consider the following: Geothermal toward "geothermal". In order to sense the subtle overtone of sentiments, one needs to know that the word "emissions" has generally negative connota- tion, which geothermal reduces. In fact, depend- ing
Anomalous shear wave attenuation in the shallow crust beneath...
P.; Rinn, D.; Kanamori and H. Published Journal Journal of Geophysical Research, 4101988 DOI Not Provided Check for DOI availability: http:crossref.org Citation Sanders, C.;...
Beneath the Surface of Giant Planets: Evolution, Structure, and Composition
Kelly Miller, Neil L.
2013-01-01T23:59:59.000Z
evolution allows the planet to cool more efficiently attimes, which allows the planet to cool more efficiently andof these cases, the planet will later cool off before the
Investigating the changing deformation mechanism beneath shallow foundations
Madabhushi, Srikanth Satyanarayana Chakrapani; Haigh, Stuart Kenneth
2015-06-02T23:59:59.000Z
mechanism. E-grade Kaolin clay was consolidated from slurry to avoid soil strength and stiffness anisotropy. A consolidometer was used that applied a uniform stress via a hydraulic piston with the stress being applied increased in increasing stages... 2011. IOS Press, vol. 1, pp. 487–492. Vardanega, P. J. and Bolton, M. D. (2012). Strength mobilization in clays and silts. Canadian Geotechnical Journal 48(10), pp. 1485–1503. Vardanega, P. J, Lau, B.H, Lam, S, Haigh, S. K, Madabhushi, S. P. G...
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...
Temporal Velocity Variations beneath the Coso Geothermal Field...
can be an important tool for characterizing geothermal reservoirs. Since microseismic sources occur more or less continuously both due to the operations of a geothermal field...
Slab plume interaction beneath the Pacific Northwest Mathias Obrebski,1
Allen, Richard M.
the Yellowstone Snake River Plain (YSRP) and second, that the subducting Juan de Fuca (JdF) slab is fragmented- canic outpouring that occurred 17 Ma. The Yellowstone Snake River Plain (YSRP) hosts a bimodal volcanic volcanic provinces. The Columbia River Basalts (CRB, Figure 1) is the product of a phase of massive vol
Beneath the Surface of Giant Planets: Evolution, Structure, and Composition
Kelly Miller, Neil L.
2013-01-01T23:59:59.000Z
larger. 2. Tidal evolution deposits energy into the planetin combination with tidal dissipation to deposit energy intothe tidal-thermal evolution model, including energy-limited
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...
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-.
Crustal and upper mantle structure beneath Antarctica and surrounding oceans
Shapiro, Nikolai
that Antarctic ice sheets insulate geologists from direct crustal observation, but it is also related to the difficulty and expense of acquiring high-quality well- distributed seismic information across the continent. Controlled source seismic experiments (long baseline refraction and reflection profiles) have provided fairly
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
Understanding what lies beneath: Groundwater critical to Texas water
Wythe, Kathy
2008-01-01T23:59:59.000Z
availability trends under normal and drought conditions. Well Information/Groundwater Quality Data: (http://www.twdb.state.tx.us/GwRD/ waterwell/well_info.asp) A database that con- tains well information, including location, depth, well type, owner..., 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...
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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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...
Beneath the Surface of Giant Planets: Evolution, Structure, and Composition
Kelly Miller, Neil L.
2013-01-01T23:59:59.000Z
panel: ratio between tidal power injected into the planetpanel: ratio between tidal power injected into the planet2001) calculated the tidal power required to maintain the
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...
On isolated vorticity regions beneath the water surface
Octavian G. Mustafa
2011-03-12T23:59:59.000Z
We present a class of vorticity functions that will allow for isolated, circular vorticity regions in the background of still water preceding the arrival of a tsunami wave at the shoreline.
Temperatures at the Base of the Seismogenic Crust Beneath Long...
temperature at which the first mineral species in the crustal rock enters the quasi-plastic domain. This sub-solidus temperature marks the onset of the transition from brittle...
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
Evidence for Deep Magma Injection Beneath Lake Tahoe,
Faulds, James E.
, and the consequent eastward collapse of the competent Sierra Nevada block. Paleozoic and Mesozoic roof pendants ( 1 and 2) compressive stresses (4, 5). The base of the seismogenic zone in the region varies locally from about 15 to 18 km (6). In the Lake Tahoe area, no crustal earth- quakes deeper than 20 km can
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 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.
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.
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.
Dynamics of Electrostatic MEMS Actuators
Yang, Yisong; Zhao, Le
2012-01-01T23:59:59.000Z
Electrostatic actuators are simple but important switching devices for MEMS applications. Due to the difficulties associated with the electrostatic nonlinearity, precise mathematical description is often hard to obtain for the dynamics of these actuators. Here we present two sharp theorems concerning the dynamics of an undamped electrostatic actuator with one-degree of freedom, subject to linear and nonlinear elastic forces, respectively. We prove that both situations are characterized by the onset of one-stagnation-point periodic response below a well-defined pull-in voltage and a finite-time touch-down or collapse of the actuator above this pull-in voltage. In the linear-force situation, the stagnation level, pull-in voltage, and pull-in coordinate of the movable electrode may all be determined explicitly, following the recent work of Leus and Elata based on numerics. Furthermore, in the nonlinear-force situation, the stagnation level, pull-in voltage, and pull-in coordinate may be described completely in t...
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.
Dynamics in Polymer | ornl.gov
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Neutron scattering characterizes dynamics in polymer family Agatha Bardoel - December 01, 2012 Interior of BASIS. Research Contact: Christine Gerstl Understanding the interplay...
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
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...
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.
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.
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...
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 ...
Dynamic Network Utility Maximization with Delivery Contracts
2007-09-30T23:59:59.000Z
Sep 30, 2007 ... Dynamic Network Utility Maximization with Delivery ... We briefly describe a heuristic, based on model predictive control, for approximately.
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
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
On the Dynamic Stability of Electricity Markets
2011-02-09T23:59:59.000Z
dicting the impact of diverse dynamic drivers (e.g., weather, load, fuel prices, and ...... the demand profile presented in Figure 2, which is obtained from a periodic ...
Communication: Quantum molecular dynamics simulation of liquid...
Office of Scientific and Technical Information (OSTI)
Communication: Quantum molecular dynamics simulation of liquid para-hydrogen by nuclear and electron wave packet approach Citation Details In-Document Search Title: Communication:...
Dynamical ensembles equivalence in fluid mechanics
Giovanni Gallavotti
1996-05-09T23:59:59.000Z
Dissipative Euler and Navier Stokes equations are discussed with the aim of proposing several experiments apt to test the equivalence of dynamical ensembles and the chaotic hypothesis.
Los Alamos Dynamics Summer School Projects
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Dynamics Summer School Projects and Resources Contact Institute Director Charles Farrar (505) 663-5330 Email Professional Staff Assistant Jutta Kayser (505) 663-5649 Email...
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 ...
Materials Science in Radiation and Dynamics Extremes
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
8 Materials Science in Radiation and Dynamics Extremes Our combination of modeling and experimental testing capabilities opens up unparalleled opportunities to do fundamental...
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 ...
Dissipative Particle Dynamics with Energy Conservation: Dynamic and Transport Properties
Josep Bonet Avalos; Allan D. Mackie
2000-02-16T23:59:59.000Z
Simulation results of the thermal conductivity ${\\cal L}$ of Dissipative Particle Dynamics model with Energy Conservation (DPDE) are reported. We also present an analysis of the transport equations and the transport coefficients for DPDE based on a local equilibrium approximation. This approach is valid when the particle-particle thermal conductivity $\\lambda$ and the friction coefficient $\\zeta$ are large. A qualitative derivation of the scaling form of the kinetic contribution of the transport of energy is derived, yielding two different forms for the kinetic contribution to the heat transport, depending on the value of $\\lambda$. We find agreement between the theoretically predicted value for ${\\cal L}$ and the simulation results, for large $\\lambda$ and many particles interacting at one time. Significant differences are found for small number of interacting particles, even with large $\\lambda$. For smaller values of $\\lambda$, the obtained macroscopic thermal conductivity is dominated by diffusive transport, in agreement with the proposed scaling form.
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 ...
ME 413 Systems Dynamics & Control Chapter 1: Introduction to System Dynamics CChhaapptteerr 11
Al-Qahtani, Hussain M.
heat) when excited by temperature or heat flow. A heating system warming a house has a dynamic response
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
Approximate Dynamic Programming for Dynamic Capacity Allocation with Multiple Priority Levels
Topaloglu, Huseyin
Approximate Dynamic Programming for Dynamic Capacity Allocation with Multiple Priority Levels In this paper, we consider a quite general dynamic capacity allocation problem. There is a fixed amount of daily to construct separable approximations to the value functions. We use the value function approximations for two
Epstein, Irving R.
FOCUS ISSUE: Nonlinear dynamics related to polymeric systems Overview: Nonlinear dynamics related is another promising practical application of nonlinear chemical dynamics. In this issue we focus on non is known about nonlinear phenom- ena in polymeric systems. One reason for the lack of interest in nonlinear
Wadley, Haydn
to investigate the dynamic performance of truss panel systems. Two configurations were computer simulated to correlate experimental system failure limits under dynamic load. The computer code matched the experimental was the only trusted metric of dynamic performance of system. Computer codes were too inaccurate
1 STATIC SECTORIZATION APPROACH TO DYNAMIC AIRSPACE CONFIGURATION USING APPROXIMATE DYNAMIC to Dynamic Airspace Configuration (DAC) by static sectorization. The objective of this paper is to address the issue of static sectorization by partitioning airspace based on controller workload i.e. airspace
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, 130 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
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
Plasticity of metal wires in torsion: molecular dynamics and dislocation dynamics simulations
Cai, Wei
on plasticity of single crystal wires in torsion. In this paper, we examine the plasticity of single crystalPlasticity 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
Plasticity of metal wires in torsion: Molecular dynamics and dislocation dynamics simulations
Cai, Wei
studies on plasticity of single crystal wires in torsion. In this paper, we examine the plasticityPlasticity 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
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.
Dynamical Friction on extended perturbers
Esquivel, O
2008-01-01T23:59:59.000Z
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.
Transport in Transitory Dynamical Systems
B. A. Mosovsky; J. D. Meiss
2010-08-10T23:59:59.000Z
We introduce the concept of a "transitory" dynamical system---one whose time-dependence is confined to a compact interval---and show how to quantify transport between two-dimensional Lagrangian coherent structures for the Hamiltonian case. This requires knowing only the "action" of relevant heteroclinic orbits at the intersection of invariant manifolds of "forward" and "backward" hyperbolic orbits. These manifolds can be easily computed by leveraging the autonomous nature of the vector fields on either side of the time-dependent transition. As illustrative examples we consider a two-dimensional fluid flow in a rotating double-gyre configuration and a simple one-and-a-half degree of freedom model of a resonant particle accelerator. We compare our results to those obtained using finite-time Lyapunov exponents and to adiabatic theory, discussing the benefits and limitations of each method.
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.
Chaotic Dynamics of Forest Fires
K. Malarz; S. Kaczanowska; K. Kulakowski
2002-04-25T23:59:59.000Z
In the thermodynamic limit, a probabilistic cellular automaton can be approximated by a deterministic nonlinear map. Here we construct such a map for the forest fire problem. The construction is based on the results of the Monte Carlo simulation, performed on a square lattice of million cells. The results of the calculation are analyzed by means of the Hoshen--Kopelman algorithm (HKA). The only parameter of the map describes the probability that a tree appears at an empty cell during one time step. The obtained map seems to be non-differentiable at the percolation threshold. The Lyapunov exponent for the map is positive. Also, we found the cycle of length three by means of the method of symbolic dynamics. The results are illustrated by the experimental data on the forest fires in Canada in years 1970--2000. Although these data are fortunately far from thermodynamic limit, their qualitative character is reproduced for smaller lattices.
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...
Black Holes and Nuclear Dynamics
David Merritt
2006-02-17T23:59:59.000Z
Supermassive black holes inhabit galactic nuclei, and their presence influences in crucial ways the evolution of the stellar distribution. The low-density cores observed in bright galaxies are probably a result of black hole infall, while steep density cusps like those at the Galactic center are a result of energy exchange between stars moving in the gravitational field of the single black hole. Loss-cone dynamics are substantially more complex in galactic nuclei than in collisionally-relaxed systems like globular clusters due to the wider variety of possible geometries and orbital populations. The rate of star-black hole interactions has begun to be constrained through observations of energetic events associated with stellar tidal disruptions.
Thermal Dynamics in General Relativity
C. S. Lopez-Monsalvo; N. Andersson
2010-06-15T23:59:59.000Z
We discuss a relativistic model for heat conduction, building on a convective variational approach to multi-fluid systems where the entropy is treated as a distinct dynamical entity. We demonstrate how this approach leads to a relativistic version of the Cattaneo equation, encoding the finite thermal relaxation time that is required to satisfy causality. We also show that the model naturally includes the non-equilibrium Gibbs relation that is a key ingredient in most approaches to extended thermodynamics. Focussing on the pure heat conduction problem, we compare the variational results to the second-order model developed by Israel and Stewart. The comparison shows that, despite the very different philosophies behind the two approaches, the two models are equivalent at first order deviations from thermal equilibrium. Finally, we complete the picture by working out the non-relativistic limit of our results, making contact with recent work in that regime.
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.
Dynamical modeling of tidal streams
Bovy, Jo, E-mail: bovy@ias.edu [Institute for Advanced Study, Einstein Drive, Princeton, NJ 08540 (United States)
2014-11-01T23:59:59.000Z
I present a new framework for modeling the dynamics of tidal streams. The framework consists of simple models for the initial action-angle distribution of tidal debris, which can be straightforwardly evolved forward in time. Taking advantage of the essentially one-dimensional nature of tidal streams, the transformation to position-velocity coordinates can be linearized and interpolated near a small number of points along the stream, thus allowing for efficient computations of a stream's properties in observable quantities. I illustrate how to calculate the stream's average location (its 'track') in different coordinate systems, how to quickly estimate the dispersion around its track, and how to draw mock stream data. As a generative model, this framework allows one to compute the full probability distribution function and marginalize over or condition it on certain phase-space dimensions as well as convolve it with observational uncertainties. This will be instrumental in proper data analysis of stream data. In addition to providing a computationally efficient practical tool for modeling the dynamics of tidal streams, the action-angle nature of the framework helps elucidate how the observed width of the stream relates to the velocity dispersion or mass of the progenitor, and how the progenitors of 'orphan' streams could be located. The practical usefulness of the proposed framework crucially depends on the ability to calculate action-angle variables for any orbit in any gravitational potential. A novel method for calculating actions, frequencies, and angles in any static potential using a single orbit integration is described in the Appendix.
Dynamic FIB Aggregation without Update Churn
Schmid, Stefan
Dynamic FIB Aggregation without Update Churn #12;Dynamic FIB Aggregation without Update Churn* to 1* to 0 0 1 1 0 1 represent as trie... ... and compress it! But: May introduce churn! Deaggregate introduce churn! Deaggregate upon route change. represent as trie... ... and compress it! BGP event! update
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...
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.
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
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
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
Stochastic-Based Robust Dynamic Resource Allocation
Maciejewski, Anthony A.
Stochastic-Based Robust Dynamic Resource Allocation in a Heterogeneous Computing System Jay Smith--This research investigates the problem of ro- bust dynamic resource allocation for heterogeneous dis- tributed computing systems operating under imposed con- straints. Often, such systems are expected to function
World-Systems as Dynamic Networks
White, Douglas R.
World-Systems as Dynamic Networks Christopher Chase-Dunn Institute for Research on World 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
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
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.
DYNAMIC RISK MANAGEMENT IN ELECTRICITY PORTFOLIO OPTIMIZATION
Römisch, Werner
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
Protein-Folding Dynamics: Overview of Molecular
Zhigilei, Leonid V.
Protein-Folding Dynamics: Overview of Molecular Simulation Techniques Harold A. Scheraga, Mey folding in silico. Although just a few years ago the dynamic be- havior of a protein molecule could models of proteins now make it possible to study protein- folding pathways from completely unfolded
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
DYNAMICS OF THE KUIPER BELT RENU MALHOTRA
Levison, Harold F.
DYNAMICS OF THE KUIPER BELT RENU MALHOTRA Lunar and Planetary Institute MARTIN DUNCAN Queen of the Kuiper Belt is reÂ viewed here. Numerical results on long term orbital evolution and dynamical mechanisms underlying the transport of objects out of the Kuiper Belt are discussed. Scenarios about the origin
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
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 Â· Test cases for 3D dynamical cores on the sphere Â are hard to find in the literature groups Â lack standardized & easy-to-use analysis techniques Â· Idea: Establish a collection of test cases
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
Dynamic Solid State Lighting Matthew Aldrich
-based lighting network. This thesis presents a first-of-its-kind pentachromatic LED-based lighting networkDynamic Solid State Lighting by Matthew Aldrich B.S., Electrical Engineering Yale University, 2004 Head Program in Media Arts and Sciences #12;2 #12;Dynamic Solid State Lighting by Matthew Aldrich
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
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
Curving Dynamics in High Speed PUBLIC VERSION
Curving Dynamics in High Speed Trains PUBLIC VERSION Daniele Bigoni Kongens Lyngby 2011 IMM forces on the dynamics, due to the high speed spinning of the wheel sets, has been highlighted. The wheel-rail interaction is modeled using the Hertz's static contact theory, corrected with the Kalker
Nash Equilibrium and Dynamics Sergiu Hart
Hart, Sergiu
Nash Equilibrium and Dynamics Sergiu Hart June 2008 Conference in Honor of John Nash's 80th Birthday Opening Panel SERGIU HART c 2008 p. #12;NASH EQUILIBRIUM AND DYNAMICS Sergiu Hart Center@huji.ac.il http://www.ma.huji.ac.il/hart SERGIU HART c 2008 p. #12;Nash equilibrium SERGIU HART c 2008 p. #12
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 of Clouds Fall Semester 2012
Collett Jr., Jeffrey L.
-2pm Course Description: This class focuses on the general dynamics of cloud systems. Models of fog, vertical velocities, and liquid water contents 1 1 Fogs and Stratocumulus Clouds · Types of fog and formation mechanisms · Radiation fog and physics and dynamics · Valley fog · Marine fog · Stratocumulus
The cognitive dynamics underlying decision-making
Jeong, Jaeseung
)Temporal dynamics 2)Sequential dynamics #12;How does the brain make effective real-world decisions dependent A B C D 0 25 50 75 100 Choicepercentage(%) Options A B C D 0 25 50 75 100 Choicepercentage(%) Options A B C D 0 25 50 75 100 Choicepercentage(%) Options B-Index 0
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
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.
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.
Dynamic trapping near a quantum critical point
Michael Kolodrubetz; Emanuel Katz; Anatoli Polkovnikov
2015-03-02T23:59:59.000Z
The study of dynamics in closed quantum systems has recently been revitalized by the emergence of experimental systems that are well-isolated from their environment. In this paper, we consider the closed-system dynamics of an archetypal model: spins near a second order quantum critical point, which are traditionally described by the Kibble-Zurek mechanism. Imbuing the driving field with Newtonian dynamics, we find that the full closed system exhibits a robust new phenomenon -- dynamic critical trapping -- in which the system is self-trapped near the critical point due to efficient absorption of field kinetic energy by heating the quantum spins. We quantify limits in which this phenomenon can be observed and generalize these results by developing a Kibble-Zurek scaling theory that incorporates the dynamic field. Our findings can potentially be interesting in the context of early universe physics, where the role of the driving field is played by the inflaton or a modulus.
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.
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.
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
System Dynamics and Vibration Lab Dept. of Mechanical Engineering
Shaw, Steven W.
System Dynamics and Vibration Lab Dept. of Mechanical Engineering Component Mode Synthesis Using #12;System Dynamics and Vibration Lab Dept. of Mechanical Engineering Outline · Motivation · Conclusions #12;System Dynamics and Vibration Lab Dept. of Mechanical Engineering Complex Structures
SWiFT Turbines Full Dynamic Characterization Opens Doors for...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
SWiFT Turbines Full Dynamic Characterization Opens Doors for Research in the Dynamics of Coupled Systems SWiFT Turbines Full Dynamic Characterization Opens Doors for Research in...
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.
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.
Thermal Cycling Combined with Dynamic Mechanical Load: Preliminary...
Thermal Cycling Combined with Dynamic Mechanical Load: Preliminary Report Thermal Cycling Combined with Dynamic Mechanical Load: Preliminary Report This PowerPoint presentation...
HyDIVE (Hydrogen Dynamic Infrastructure and Vehicle Evolution...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
HyDIVE (Hydrogen Dynamic Infrastructure and Vehicle Evolution) Model Analysis HyDIVE (Hydrogen Dynamic Infrastructure and Vehicle Evolution) Model Analysis Presentation by NREL's...
Molecular Dynamics Study of the Proposed Proton Transport Pathways...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
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...
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...
Mineral Association Changes the Secondary Structure and Dynamics...
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Mineral Association Changes the Secondary Structure and Dynamics of Murine Amelogenin. Mineral Association Changes the Secondary Structure and Dynamics of Murine Amelogenin....
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...
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...
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...
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...
Bilayer Structure and Lipid Dynamics in a Model Stratum Corneum...
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Bilayer Structure and Lipid Dynamics in a Model Stratum Corneum with Oleic Acid. Bilayer Structure and Lipid Dynamics in a Model Stratum Corneum with Oleic Acid. Abstract: The...
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...
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...
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...
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
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 ...
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...
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...
General Dynamics and Nissan Case Studies Highlight Benefits of...
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General Dynamics and Nissan Case Studies Highlight Benefits of Superior Energy Performance General Dynamics and Nissan Case Studies Highlight Benefits of Superior Energy...
Molecular Dynamics Simulation Studies of Electrolytes andElectrolyte...
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Dynamics Simulation Studies of Electrolytes and ElectrolyteElectrode Interfaces Molecular Dynamics Simulation Studies of Electrolytes and ElectrolyteElectrode Interfaces 2010 DOE...
Site-Specific DNA Structural and Dynamic Features Revealed by...
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DNA Structural and Dynamic Features Revealed by Nucleotide-Independent Nitroxide Probes. Site-Specific DNA Structural and Dynamic Features Revealed by Nucleotide-Independent...
Chemical Dynamics, Molecular Energetics, and Kinetics at the Synchrotron
Leone, Stephen R.
2010-01-01T23:59:59.000Z
novel measurements of chemical dynamics for clusters, Chemical Dynamics, Molecular Energetics, and Kinetics at theUniversity of California Chemical Sciences Division,
Structure and Dynamics of Polymer Nanocomposites by Grazing-Incidence...
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Structure and Dynamics of Polymer Nanocomposites by Grazing-Incidence X-Ray Techniques (Presentation) Structure and Dynamics of Polymer Nanocomposites by Grazing-Incidence X-Ray...
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...
Efficient and Dynamic ? The BMW Group Roadmap for the Application...
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and Dynamic The BMW Group Roadmap for the Application of Thermoelectric Generators Efficient and Dynamic The BMW Group Roadmap for the Application of Thermoelectric...
ITP Chemicals: Technology Roadmap for Computational Fluid Dynamics...
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Fluid Dynamics, January 1999 ITP Chemicals: Technology Roadmap for Computational Fluid Dynamics, January 1999 cfdroadmap.pdf More Documents & Publications A Workshop to Identify...
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...
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.
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.
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.
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.
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.
Parallel Implementation of Power System Dynamic Simulation
Jin, Shuangshuang; Huang, Zhenyu; Diao, Ruisheng; Wu, Di; Chen, Yousu
2013-07-21T23:59:59.000Z
Dynamic simulation of power system transient stability is important for planning, monitoring, operation, and control of electrical power systems. However, modeling the system dynamics and network involves the computationally intensive time-domain solution of numerous differential and algebraic equations (DAE). This results in a transient stability implementation that may not maintain the real-time constraints of an online security assessment. This paper presents a parallel implementation of the dynamic simulation on a high-performance computing (HPC) platform using parallel simulation algorithms and computation architectures. It enables the simulation to run even faster than real time, enabling the “look-ahead” capability of upcoming stability problems in the power grid.
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.
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.
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.