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1

Ancient Lava Flows Trap CO2 for Long-Term Storage in Big Sky Injection |  

Broader source: Energy.gov (indexed) [DOE]

Ancient Lava Flows Trap CO2 for Long-Term Storage in Big Sky Ancient Lava Flows Trap CO2 for Long-Term Storage in Big Sky Injection Ancient Lava Flows Trap CO2 for Long-Term Storage in Big Sky Injection August 13, 2013 - 1:59pm Addthis Photo by J.D. Griggs, courtesy of U.S.Geological Survey Photo by J.D. Griggs, courtesy of U.S.Geological Survey For Additional Information To learn more about the carbon storage projects in which NETL is involved, please visit the NETL Carbon Storage website How can a prehistoric volcanic eruption help us reduce the amount of CO2 released into the atmosphere today? The answer is found in the basalt formations created by the lava - formations that can be used as sites for injecting carbon dioxide (CO2) captured from industrial sources in a process called carbon capture and storage (CCS).

2

Ancient Lava Flows Trap CO2 for Long-Term Storage in Big Sky Injection |  

Broader source: Energy.gov (indexed) [DOE]

Ancient Lava Flows Trap CO2 for Long-Term Storage in Big Sky Ancient Lava Flows Trap CO2 for Long-Term Storage in Big Sky Injection Ancient Lava Flows Trap CO2 for Long-Term Storage in Big Sky Injection August 13, 2013 - 1:59pm Addthis Photo by J.D. Griggs, courtesy of U.S.Geological Survey Photo by J.D. Griggs, courtesy of U.S.Geological Survey For Additional Information To learn more about the carbon storage projects in which NETL is involved, please visit the NETL Carbon Storage website How can a prehistoric volcanic eruption help us reduce the amount of CO2 released into the atmosphere today? The answer is found in the basalt formations created by the lava - formations that can be used as sites for injecting carbon dioxide (CO2) captured from industrial sources in a process called carbon capture and storage (CCS).

3

Nature and extent of lava-flow aquifers beneath Pahute Mesa, Nevada Test Site  

SciTech Connect (OSTI)

Work is currently underway within the Underground Test Area subproject of the US Department of Energy/Nevada Operations Office Environmental Restoration Program to develop corrective action plans in support of the overall corrective action strategy for the Nevada Test Site as established in the Federal Facility Agreement and Consent Order (FFACO, 1996). A closure plan is currently being developed for Pahute Mesa, which has been identified in the FFACO as consisting of the Western and Central Pahute Mesa Corrective Action Units. Part of this effort requires that hydrogeologic data be compiled for inclusion in a regional model that will be used to predict a contaminant boundary for these Corrective Action Units. Hydrogeologic maps have been prepared for use in the model to define the nature and extent of aquifers and confining units that might influence the flow of contaminated groundwater from underground nuclear tests conducted at Pahute Mesa. Much of the groundwater flow beneath Pahute Mesa occurs within lava-flow aquifers. An understanding of the distribution and hydraulic character of these important hydrogeologic units is necessary to accurately model groundwater flow beneath Pahute Mesa. This report summarizes the results of a study by Bechtel Nevada geologists to better define the hydrogeology of lava-flow aquifers at Pahute Mesa. The purpose of this study was twofold: (1) aid in the development of the hydrostratigraphic framework for Pahute Mesa, and (2) provide information on the distribution and hydraulic character of lava-flow aquifers beneath Pahute Mesa for more accurate computer modeling of the Western and Central Pahute Mesa Corrective Action Units.

Prothro, L.B.; Drellack, S.L. Jr.

1997-09-01T23:59:59.000Z

4

Microfabricated Renewable Beads-Trapping/Releasing Flow Cell...  

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

Microfabricated Renewable Beads-TrappingReleasing Flow Cell for Rapid Antigen-Antibody Reaction in Chemiluminescent Immunoassay Microfabricated Renewable Beads-TrappingReleasing...

5

The Rajahmundry Traps, Andhra Pradesh: Evaluation of their petrogenesis relative to the Deccan Traps  

Science Journals Connector (OSTI)

Geochemical and geochronological data for rocks from the Rajahmundry Traps, are evaluated for possible correlation with the main Deccan province. Lava flows are found on both banks of the Godavari River and co...

Ajoy K. Baksi

2001-12-01T23:59:59.000Z

6

A paleomagnetic study of the Mull lava succession  

Science Journals Connector (OSTI)

......as evaluated from historic Hawaiian lava flows...magnetization in some Permian lava flows of southern...Mountains and Sverdrup Basin, and Brooks Range...structures of the Arctic Basin and its environs...as evaluated from historic Hawaiian lava flows...magnetization in some Permian lava flows of Strangway......

James M. Hall; R. L. Wilson; Peter Dagley

1977-05-01T23:59:59.000Z

7

CONTINUOUS FLOW "RAIL-AND-TRAP" MICROFLUIDIC PROCESSORS FOR AUTONOMOUS  

E-Print Network [OSTI]

CONTINUOUS FLOW "RAIL-AND-TRAP" MICROFLUIDIC PROCESSORS FOR AUTONOMOUS BEAD-BASED MIXING laborious and time intensive fluidic mixing procedures. Although microfluidic platforms offer significant, here we present a microfluidic "rail-and-trap" processor that functions autonomously under continuous

Lin, Liwei

8

Simulation of dust streaming in toroidal traps: Stationary flows  

SciTech Connect (OSTI)

Molecular-dynamic simulations were performed to study dust motion in a toroidal trap under the influence of the ion drag force driven by a Hall motion of the ions in E x B direction, gravity, inter-particle forces, and friction with the neutral gas. This article is focused on the inhomogeneous stationary streaming motion. Depending on the strength of friction, the spontaneous formation of a stationary shock or a spatial bifurcation into a fast flow and a slow vortex flow is observed. In the quiescent streaming region, the particle flow features a shell structure which undergoes a structural phase transition along the flow direction.

Reichstein, Torben; Piel, Alexander [IEAP, Christian-Albrechts-Universitaet, D-24098 Kiel (Germany)

2011-08-15T23:59:59.000Z

9

Reversed magnetization A NOVEL DEVICE FOR CONTINUOUS FLOW MAGNETIC TRAPPING  

E-Print Network [OSTI]

1. 3 µm5 µm Reversed magnetization A NOVEL DEVICE FOR CONTINUOUS FLOW MAGNETIC TRAPPING AND SORTING Martin d'hères, France ABSTRACT The manipulation of magnetically labeled bio-objects of nano or micrometer sizes is now realizable by combining the magnetic forces with microfluidics. This paper reports

Paris-Sud XI, Université de

10

Flow pattern and hydraulic performance of the REDAC Gross Pollutant Trap  

Science Journals Connector (OSTI)

This paper discusses the flow pattern and hydraulic performance of a Gross Pollutant Trap (GPT), designed and patented by River Engineering and Drainage Research Centre (REDAC) at Universiti Sains Malaysia. Stormwater problems have become more severe due to the increase in urbanization. The increase in the amount of impervious surface in urban areas produces more stormwater runoff, that is carried to the receiving bodies of water. The higher runoff volume also carries more pollutants (gross pollutants, sediments, and nutrients) from the contributing catchment area. Coarse sediments transported by stormwater runoff have negative effects on the receiving body of water and the aquatic environment by covering up aquatic habitats and clogging waterways. One of the challenges in designing a GPT for urban stormwater drainage is providing effective trapping without hindering the hydraulic function of the channel, thus, avoiding overspill or flooding. The current study presents a GPT design to meet these specific requirements of trapping efficiency and hydraulic function. The current GPT overcame the common problem of overspilling of gross pollutants in GPT by the introduction of additional overspill compartments that can handle excessive runoff and improve pollutant trapping in higher flow conditions. In laboratory testing, the prototype GPT was capable of achieving good trapping efficiency (over 80% for gross pollutants and over 60% for coarse sediments) without causing any overspill.

Aminuddin Ab Ghani; H.Md. Azamathulla; Tze Liang Lau; C.H. Ravikanth; Nor Azazi Zakaria; Cheng Siang Leow; Mohd Azlan Mohd Yusof

2011-01-01T23:59:59.000Z

11

Parallel heat flux and flow acceleration in open field line plasmas with magnetic trapping  

SciTech Connect (OSTI)

The magnetic field strength modulation in a tokamak scrape-off layer (SOL) provides both flux expansion next to the divertor plates and magnetic trapping in a large portion of the SOL. Previously, we have focused on a flux expander with long mean-free-path, motivated by the high temperature and low density edge anticipated for an absorbing boundary enabled by liquid lithium surfaces. Here, the effects of magnetic trapping and a marginal collisionality on parallel heat flux and parallel flow acceleration are examined. The various transport mechanisms are captured by kinetic simulations in a simple but representative mirror-expander geometry. The observed parallel flow acceleration is interpreted and elucidated with a modified Chew-Goldberger-Low model that retains temperature anisotropy and finite collisionality.

Guo, Zehua; Tang, Xian-Zhu; McDevitt, Chris [Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

2014-10-15T23:59:59.000Z

12

Analytical-Numerical Modeling Of Komatiite Lava Emplacement And Thermal  

Open Energy Info (EERE)

Analytical-Numerical Modeling Of Komatiite Lava Emplacement And Thermal Analytical-Numerical Modeling Of Komatiite Lava Emplacement And Thermal Erosion At Perseverance, Western Australia Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Analytical-Numerical Modeling Of Komatiite Lava Emplacement And Thermal Erosion At Perseverance, Western Australia Details Activities (0) Areas (0) Regions (0) Abstract: We have applied a thermal-fluid dynamic-geochemical model to investigate the emplacement and erosional potential of Archean komatiite flows at Perseverance, Western Australia. Perseverance has been proposed as a site of large-scale thermal erosion by large-volume komatiite eruption(s), resulting in a 100-150-m-deep lava channel containing one of the world's largest komatiite-hosted Fe-Ni-Cu-(PGE) sulfide deposits. Using

13

A chemostratigraphic investigation of the prehistoric Vavalaci lava sequence on Mount Etna: Simulating borehole drilling  

Science Journals Connector (OSTI)

Scientific drilling of volcanic successions has been suggested as a way of establishing stratigraphic sequences of unexposed lava flows on large complex volcanoes, with the aim of in-depth study of magmatic processes and source geochemistry of otherwise inaccessible lava sequences. To simulate the core drilling of such sequences, lava flows from the prehistoric Vavalaci Centre exposed in the south wall of the Valle del Bove, Mount Etna, Sicily, were sampled in four stratigraphic sections. The fresh, generally strongly porphyritic Na-alkaline trachybasalts and trachyandesites show diverging sub-parallel trends of high- and low-alkali concentrations in total alkali versus silica (TAS) diagrams, whilst variations of other major and trace elements reveal two further distinct chemical groups enriched in K, REE and Ti which follow separate fractionation paths. A set of control samples was used to establish geochemical variations within a single lava flow. Primitive mantle normalised incompatible element patterns demonstrate that the lavas have highly enriched OIB signatures with a clear division in LREE, Ba, Th, Nb and Zr concentrations between the four different chemical groups. Comparison of data for the Vavalaci lavas with the compositions of other prehistoric, historic and recent eruptions of Mt. Etna indicates a temporal trend towards more basic magma compositions. The chemostratigraphy of the lavas was statistically analysed to give correlations between flows from different sections. Whilst a good number of geologically meaningful correlations were revealed, we can demonstrate that only one set of lavas was actually sampled in all four sections, whilst a number of unique lavas remain uncorrelated. Thus no individual section, or simulated borehole core, provided samples of the complete lava flow sequence without significant gaps in the stratigraphy. The trends in lava compositions are also defined in the stratigraphy, showing their evolution from low- to high-alkali lavas through the series, which may be related to temporal decrease in degree of partial melting of the mantle rather than through simple fractionation processes or mixing of magmas.

Ann Spence; Hilary Downes

2011-01-01T23:59:59.000Z

14

The Deccan Trap CretaceousPaleogene boundary connection; new 40Ar/39Ar ages and critical assessment of existing argon data pertinent to this hypothesis  

Science Journals Connector (OSTI)

Abstract The CretaceousPaleogene boundary (KPgB) was dated by the 40Ar/39Ar method herein from the western interior of North America at 65.480.12Ma (1?), in good agreement with other recent published estimates. For the Deccan Traps, India, new argon ages as well as others available in the literature, are assessed for reliability based on (a) statistical reliability of plateau/isochron sections and (b) freshness of material dated utilizing the alteration index method. From tholeiitic lavas from the Composite Western Ghats Section (CWGS), only six ages are found to be reliable estimates of the time of crystallization. These ages along with the magnetic polarity of the lavas agree with the geomagnetic polarity time scale (GPTS) at ?6764Ma. Alkaline rocks from the Anjar area of Kutch, provide three reliable ages that suggest a hiatus in lava extrusion around KPgB. For the Rajahmundry basalts, the upper flows age defines its formation during chron 29n; a single age from the lower reversed polarity flow appears somewhat dichotomous when plotted against the GPTS. The reliable lava ages indicate the most voluminous (reversed polarity) sections of the CWGS were extruded at a time statistically indistinguishable from that of the KPgB. The Deccan Trap \\{KPgB\\} faunal extinction hypothesis remains plausible, but must compete with the latest report, favoring a very close temporal connection (?0.03m.y.) between the Chixculub (Impact) Crater and the KPgB.

Ajoy K. Baksi

2014-01-01T23:59:59.000Z

15

Tank Treading of Optically Trapped Red Blood Cells in Shear Flow Himanish Basu, Aditya K. Dharmadhikari, Jayashree A. Dharmadhikari, Shobhona Sharma,* and Deepak Mathur*  

E-Print Network [OSTI]

Tank Treading of Optically Trapped Red Blood Cells in Shear Flow Himanish Basu, Aditya K Research, Mumbai, India ABSTRACT Tank-treading (TT) motion is established in optically trapped, live red while undergoing tank-treading motion (13­17). In an RBC, the cytoskeleton and the plasma membrane form

Sharma, Shobhona

16

Journal of Volcanology and Geothermal Research69 (1995) 105-l 16 Mount St. Helens and Santiaguito lava domes: The effect of short-  

E-Print Network [OSTI]

of silicic lava flows, we studied surface characteristics and obtained water content and hydrogen isotopic for these patterns is most clearly preserved in lavas erupted during early, rapid stages of dome growth. Petrologists to sample flows early in their emplacement while paying attention to surface texture, position relative

Rose, William I.

17

How lava flows: New insights from applications of lidar technologies to lava flow studies  

Science Journals Connector (OSTI)

...systems record the entire waveform of the energy pulse that is backscattered from the reflecting...on lahars from Popocatepetl Volcano, Mexico: Journal of Volcanology and Geothermal...reconstruction of geohistory in the age of reform : Chicago, Illinois, University of Chicago...

K.V. Cashman; S.A. Soule; B.H. Mackey; N.I. Deligne; N.D. Deardorff; H.R. Dietterich

18

The influence of wind on the estimation of lava effusion rate from thermal remote-sensing  

Science Journals Connector (OSTI)

Abstract Effusion rate is a key parameter to model lava flow advance and associated risks. Estimation of effusion rate from thermal remote-sensing using satellite data has matured to the point where it can be an operational monitoring tool, notably for volcanoes without a ground observatory. However, robust physical models, as required for quantitative interpretations, have not yet been adequately developed. The current and widely used method relates the satellite-measured radiated power to the flow effusion rate through the lava area, with an empirical fit that assumes a low surface cooling efficiency. Here we use novel fluid dynamic laboratory experiments and viscous flow theory to show that assuming low convective cooling at the surface of the flow leads to a systematic underestimation of the effusion rate. This result, obtained for the case of a hot isoviscous gravity current which cools as it flows, relies only on the respective efficiency of convection and radiation at the flow surface, and is independent of the details of the internal flow model. Applying this model to lava flows cooling under classical wind conditions, we find that the model compares well to data acquired on basaltic eruptions within the error bars corresponding to the uncertainties on natural wind conditions. Hence the thermal proxy deduced from the isoviscous model does not seem to require an additional fitting parameter accounting for internal flow processes such as crystallization. The predictions of the model are not correct however for thick lava flows such as highly viscous domes, because a thermal steady state is probably not reached for these flows. Furthermore, in the case of very large basaltic flows, extra cooling is expected due to self-induced convection currents. The increased efficiency of surface cooling for these large eruptions must be taken into account to avoid a gross and dangerously misleading underestimate of the effusion rate.

F. Garel; E. Kaminski; S. Tait; A. Limare

2013-01-01T23:59:59.000Z

19

Effect of Continuous, Trapped, and Flowing Gas on Performance of Alkaline Surfactant Polymer (ASP) Flooding  

Science Journals Connector (OSTI)

Alkali Surfactant Polymer (ASP) flooding has traditionally been considered in tertiary mode, i.e., after a reservoir has been sufficiently water flooded. ... and flow properties of an ASP flood are captured to calibrate a comprehensive reservoir-simulation model. ... Roshanfekr, M.; Johns, R. T.; Pope, G.; Britton, L.; Linnemeyer, H.; Britton, C.; Vyssotski, A.Simulation of the Effect of Pressure and Solution Gas on Oil Recovery From Surfactant/Polymer Floods SPE J. 2012, 17 ( 3) 705 ...

R. Farajzadeh; A. Ameri; M. J. Faber; D. W. van Batenburg; D. M. Boersma; J. Bruining

2013-08-22T23:59:59.000Z

20

Lava Creek Geothermal Area | Open Energy Information  

Open Energy Info (EERE)

Lava Creek Geothermal Area Lava Creek Geothermal Area Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Geothermal Resource Area: Lava Creek Geothermal Area Contents 1 Area Overview 2 History and Infrastructure 3 Regulatory and Environmental Issues 4 Exploration History 5 Well Field Description 6 Geology of the Area 7 Geofluid Geochemistry 8 NEPA-Related Analyses (0) 9 Exploration Activities (0) 10 References Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"TERRAIN","zoom":6,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"500px","height":"300px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":65.2283,"lon":-162.894,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

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


21

Steam Trap Application  

E-Print Network [OSTI]

characteristics. 2. Understand advantages and limitations of various checking methods. 3. Use more than one checking method. 4. Understand flash condensate. 5. Condensate makes more noise than steam. 6. Trouble shoot the system. 7. Review trap... or failed steam and condensate flow~' H closed to be undetected -Not always insensitive to back ground or ambient noise -Noise in electrical system if volume too high -Head set quality important -Location of probe on trap, contact force, pressure drop...

Murphy, J. J.

1982-01-01T23:59:59.000Z

22

detonation trap  

Science Journals Connector (OSTI)

detonation trap [It prevents a detonation initiated in one part of a system...] ? Detonationsfang m, Detonationsfnger m

2014-08-01T23:59:59.000Z

23

Managing the Steam Trap Population  

E-Print Network [OSTI]

hundred steam traps installed only 58 were working effectively -- 42% needed attention! These programs had associated cost benefits of at least 100% return on investment, a maximum six month breakeven on cash flow, and an energy cost reduction amounting...

Atlas, R. D.

1983-01-01T23:59:59.000Z

24

Trapping Coyotes  

E-Print Network [OSTI]

Coyotes cause millions of dollars of damage yearly to livestock and crops in Texas. The leaflet explains coyote habits and the types of trap set, such as scent posts, dirt holes, and trail and carcass sets. The variety of traps available and how...

Texas Wildlife Services

2008-04-15T23:59:59.000Z

25

Lava Hot Springs Space Heating Low Temperature Geothermal Facility | Open  

Open Energy Info (EERE)

Space Heating Low Temperature Geothermal Facility Space Heating Low Temperature Geothermal Facility Jump to: navigation, search Name Lava Hot Springs Space Heating Low Temperature Geothermal Facility Facility Lava Hot Springs Sector Geothermal energy Type Space Heating Location Lava Hot Springs, Idaho Coordinates 42.6193625°, -112.0110712° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[]}

26

Distinctive upper mantle anisotropy beneath the High Lava Plains and Eastern Snake River Plain,  

E-Print Network [OSTI]

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

27

Circulating Optical Particle Trapping through the Integration of Fiber Optics and Microfluidics  

Science Journals Connector (OSTI)

A dual-fiber optic trap is integrated with microfluidics, and stable circulatory particle trapping is observed. The unique circulating and flow-dependant nature of the trap enables...

Blakely, J Thomas; Gordon, Reuven; Sinton, David

28

Paleomagnetism of Midway Atoll lavas and northward movement of the Pacific plate  

Science Journals Connector (OSTI)

Two deep drill holes through the reef limestones of Midway Atoll penetrated 120 m and 19 m of basaltic lavas that were dated by the \\{KAr\\} method at 18 my. Inclinations of natural remanent magnetization have been measured in 173 specimens cut from 57 core samples from 13 of the lava flows. The mean paleomagnetic inclination is27.6 6.8, corresponding to a paleolatitude of14.7 4.2. The present latitude of Midway is 28, suggesting a northward component of motion of the Pacific plate of approximately 13 or 1400 km in the last 18 my. The paleolatitude of Midway is thus not significantly different from the present latitude (19) of the active volcanic island of Hawaii. The paleomagnetic data from the Midway basalts thus support the hypothesis of Wilson and Morgan that volcanic heat sources are fixed with respect to the Earth's mantle below the asthenosphere and their apparent migration with time is due to plate motion.

Sherman Gromm; F.J. Vine

1972-01-01T23:59:59.000Z

29

Interaction of trapped ions with trapped atoms  

E-Print Network [OSTI]

In this thesis, I present results from two Paul-trap based ion traps carried out in the Vuleti? laboratory: the Atom-Ion trap for collision studies between cold atoms and cold ions, and the Cavity-Array trap for studying ...

Grier, Andrew T. (Andrew Todd)

2011-01-01T23:59:59.000Z

30

Pulsatory magma supply to a phonolite lava lake Clive Oppenheimer a,  

E-Print Network [OSTI]

Pulsatory magma supply to a phonolite lava lake Clive Oppenheimer a, , Alexandra S. Lomakina b processes (Tazieff, 1997; Oppenheimer et al., 2004). The decadal persistence of some lava lakes, with no net, though it may well have existed for a century or more (Oppenheimer and Kyle, 2008). Since 2001, the lake

Kingsbury, Nick

31

Peak discharge of a Pleistocene lava-dam outburst flood in Grand Canyon, Arizona, USA  

E-Print Network [OSTI]

produced the largest known flood on the Colorado River in Grand Canyon. The Hyaloclastite Dam was up to 366 Canyon; Colorado river; Pleistocene floods; Lava dams; Hydraulic modeling; Paleoflood indicators; DamPeak discharge of a Pleistocene lava-dam outburst flood in Grand Canyon, Arizona, USA Cassandra R

32

Hands On Science with NOAA TITLE: Plate Tectonics and Lava Lamps  

E-Print Network [OSTI]

and geological events?" Answer = heat from radioactive decay · Compare the light bulb in lava to Earth's internal in the lava lamp. · Plot recent earthquakes and volcanic activity on a world map and compare to the location.education.noaa.gov/Ocean_and_Coasts/Ocean_Floor_Features.html USGS Earthquake Hazards - http

33

Lava Hot Springs Pool & Spa Low Temperature Geothermal Facility | Open  

Open Energy Info (EERE)

Lava Hot Springs Pool & Spa Low Temperature Geothermal Facility Lava Hot Springs Pool & Spa Low Temperature Geothermal Facility Jump to: navigation, search Name Lava Hot Springs Pool & Spa Low Temperature Geothermal Facility Facility Lava Hot Springs Sector Geothermal energy Type Pool and Spa Location Lava Hot Springs, Idaho Coordinates 42.6193625°, -112.0110712° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[]}

34

Microfabricated Ion Traps  

E-Print Network [OSTI]

Ion traps offer the opportunity to study fundamental quantum systems with high level of accuracy highly decoupled from the environment. Individual atomic ions can be controlled and manipulated with electric fields, cooled to the ground state of motion with laser cooling and coherently manipulated using optical and microwave radiation. Microfabricated ion traps hold the advantage of allowing for smaller trap dimensions and better scalability towards large ion trap arrays also making them a vital ingredient for next generation quantum technologies. Here we provide an introduction into the principles and operation of microfabricated ion traps. We show an overview of material and electrical considerations which are vital for the design of such trap structures. We provide guidance in how to choose the appropriate fabrication design, consider different methods for the fabrication of microfabricated ion traps and discuss previously realized structures. We also discuss the phenomenon of anomalous heating of ions within ion traps, which becomes an important factor in the miniaturization of ion traps.

Marcus D. Hughes; Bjoern Lekitsch; Jiddu A. Broersma; Winfried K. Hensinger

2011-06-28T23:59:59.000Z

35

REVIEW ARTICLE Optical trapping  

E-Print Network [OSTI]

REVIEW ARTICLE Optical trapping Keir C. Neuman and Steven M. Blocka) Department of Biological ago, optical traps have emerged as a powerful tool with broad-reaching applications in biology--and the measurement of nanometer-level displacements of--optically trapped objects. We review progress

Block, Steven

36

Harnessing Sun, Wind and Lava for Islands' Energy Needs | Department of  

Broader source: Energy.gov (indexed) [DOE]

Harnessing Sun, Wind and Lava for Islands' Energy Needs Harnessing Sun, Wind and Lava for Islands' Energy Needs Harnessing Sun, Wind and Lava for Islands' Energy Needs November 3, 2010 - 10:56am Addthis Niketa Kumar Niketa Kumar Public Affairs Specialist, Office of Public Affairs Last month, the Energy Blog featured a read out of Assistant Secretary Patricia Hoffman's trip to Honolulu and the Hawaii Clean Energy Initiative (HCEI). Bolstered by HCEI, Hawaii is harnessing its indigenous sources of energy to achieve 70 percent clean energy usage by 2030. Islands across the world are similarly positioned to address their unique energy challenges with endemic resources: sun, wind, waves and lava. Cue in the Energy Development in Island Nations (EDIN) project - this international collaboration between the United States, Iceland and New

37

Development of the Long Valley, California, magma chamber recorded in precaldera rhyolite lavas of Glass Mountain  

Science Journals Connector (OSTI)

Glass Mountain, California, consists of >50 km3...of high-silica rhyolite lavas and associated pyroclastic deposits that erupted over a period of >1 my preceding explosive eruption of the Bishop Tuff and formatio...

J. M. Metz; G. A. Mahood

38

FEMP-FTA--Steam Trap Performance Assessment  

Broader source: Energy.gov (indexed) [DOE]

Steam Trap Function Steam Trap Function Steam traps are automatic valves used in every steam system to remove conden- sate, air, and other non-condensable gases while preventing or minimizing the passing of steam. If condensate is allowed to collect, it reduces the flow capacity of steam lines and the thermal capacity of heat transfer equipment. In addition, excess condensate can lead to "water hammer," with potentially destructive and dangerous results. Air that remains after system startup reduces steam pressure and temperature and may also reduce the thermal capacity of heat transfer equipment. Non-condensable gases, such as oxygen and carbon dioxide, cause corrosion. Steam that passes through the trap provides no heating ser- vice. This effectively reduces the heating capacity

39

Neutral atom traps.  

SciTech Connect (OSTI)

This report describes progress in designing a neutral atom trap capable of trapping sub millikelvin atom in a magnetic trap and shuttling the atoms across the atom chip from a collection area to an optical cavity. The numerical simulation and atom chip design are discussed. Also, discussed are preliminary calculations of quantum noise sources in Kerr nonlinear optics measurements based on electromagnetically induced transparency. These types of measurements may be important for quantum nondemolition measurements at the few photon limit.

Pack, Michael Vern

2008-12-01T23:59:59.000Z

40

Structural traps I, tectonic fold traps  

SciTech Connect (OSTI)

This book contains studies of fields that exist because of the presence of an anticline; without the anticline there would be no trap. The fields described in this volume illustrate the complex nature of a trap type that some explorationists mistakenly regard as simple and therefore not worthy of close scrutiny. Anticlinal traps are like all other fields - each has its own peculiar personality. Many of the fields in this volume are sourced from continentally derived organic matter. All have sandstone reservoirs. Most have shale seals, but one, Sarir, has an evaporite seal. Many are faulted anticlines. Some of the anticlines formed in a compressional tectonic setting, whereas others formed in a tensional tectonic setting.

Beaumont, E.A.; Foster, N.H.

1990-01-01T23:59:59.000Z

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


41

Compact, Rapid Cell Deformability Measurements Using Diode Laser Bar Optical Trapping in Microfluidics  

Science Journals Connector (OSTI)

We present a simple, compact, microfluidic system that easily facilitates diode laser bar optical trapping for cell stretching measurements and particle sorting within flowing...

Applegate Jr , Robert W; Squier, Jeff; Vestad, Tor; Oakey, John; Marr, David W

42

Nonlinear integrable ion traps  

SciTech Connect (OSTI)

Quadrupole ion traps can be transformed into nonlinear traps with integrable motion by adding special electrostatic potentials. This can be done with both stationary potentials (electrostatic plus a uniform magnetic field) and with time-dependent electric potentials. These potentials are chosen such that the single particle Hamilton-Jacobi equations of motion are separable in some coordinate systems. The electrostatic potentials have several free adjustable parameters allowing for a quadrupole trap to be transformed into, for example, a double-well or a toroidal-well system. The particle motion remains regular, non-chaotic, integrable in quadratures, and stable for a wide range of parameters. We present two examples of how to realize such a system in case of a time-independent (the Penning trap) as well as a time-dependent (the Paul trap) configuration.

Nagaitsev, S.; /Fermilab; Danilov, V.; /SNS Project, Oak Ridge

2011-10-01T23:59:59.000Z

43

Electron Trapping by Molecular Vibration  

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

Electron Trapping by Molecular Vibration Electron Trapping by Molecular Vibration Print Wednesday, 27 April 2005 00:00 In photoelectron spectroscopy experiments performed at the...

44

238U Decay Series Systematics Of Young Lavas From Batur Volcano, Sunda Arc  

Open Energy Info (EERE)

238U Decay Series Systematics Of Young Lavas From Batur Volcano, Sunda Arc 238U Decay Series Systematics Of Young Lavas From Batur Volcano, Sunda Arc Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: 238U Decay Series Systematics Of Young Lavas From Batur Volcano, Sunda Arc Details Activities (0) Areas (0) Regions (0) Abstract: Activities of 238U decay series radioisotopes have been determined for both postcaldera basalts erupted between 1849 and 1974 and genetically related young precaldera dacites from Batur volcano, Bali, Sunda arc. All rocks possess (230Th/238U) = 1 within 2 sigma error indicating that little, if any, fractionation between Th and U occurred during their genesis, or in their source regions, within approximately the last 350 ka. Both the basaltic and the dacitic rocks possess (230Th/232U) ~

45

Evaluating Steam Trap Performance  

E-Print Network [OSTI]

~LmT " TRIf' 1 TRIf' 2 Figure 2 It has become common practice for engineers to oversize steam traps and place more emphasis on first cost than on maintenance cost and operating 766 3 4 ESL-IE-86-06-126 Proceedings from the Eighth Annual Industrial...EVALUATING STEAM TRAP PERFORMANCE Noel Y Fuller, P.E. Holston Defense Corporation Kingsport, Tennessee ABSTRACT Laboratory tests were conducted on several types of steam traps at Holston Defense Corporation in Kingsport, Tennessee. Data...

Fuller, N. Y.

46

TRAPping Modelica with Python  

Science Journals Connector (OSTI)

This short paper introduces TRAP, a small but powerful compiler development system based on the object-oriented, dynamic language Python. Employing a very high level language as a compiler tools base language re...

Thilo Ernst

1999-01-01T23:59:59.000Z

47

Trapping and Probing Antihydrogen  

SciTech Connect (OSTI)

Precision spectroscopy of antihydrogen is a promising path to sensitive tests of CPT symmetry. The most direct route to achieve this goal is to create and probe antihydrogen in a magnetic minimum trap. Antihydrogen has been synthesized and trapped for 1000s at CERN by the ALPHA Collaboration. Some of the challenges associated with achieving these milestones will be discussed, including mixing cryogenic positron and antiproton plasmas to synthesize antihydrogen with kinetic energy less than the trap potential of .5K. Recent experiments in which hyperfine transitions were resonantly induced with microwaves will be presented. The opportunity for gravitational measurements in traps based on detailed studies of antihydrogen dynamics will be described. The talk will conclude with a discussion future antihydrogen research that will use a new experimental apparatus, ALPHA-I.

Wurtele, Jonathan [UC Berkeley and LBNL

2013-03-27T23:59:59.000Z

48

Structural traps 5  

SciTech Connect (OSTI)

This book contains studies of oil and gas fields that are mainly structural in nature. Stratigraphy controls the extend of the reservoir in the traps of several fields, but overall, the main trapping features within the group of fields in this volume are structural. Fields covered in this volume include: Endicott Field, Point Arguello Field, West Puerto Chiquito Field, Dukhan Field, Sendji Field, Ruston Field, Raudhatain Field, Hassi Messaoud Field, Snapper Field, Tirrawarra Field, and Sacha Field.

Foster, N.H.; Beaumont, E.A.

1991-01-01T23:59:59.000Z

49

Structural traps 2  

SciTech Connect (OSTI)

This book contains studies of fields that exist because of the presence of tectonic faulting. Tectonic faulting occurs because of the release of crustal stresses. Nontectonic faulting is due to other factors, such as salt solution and collapse or detachment from sedimentary loading and slumping. The traps responsible for the fields in this volume are related either directly or indirectly to a fault block. The traps of Amposta, Cano Limon, Ninian, Renqiu, and Sarir are directly related to a fault block. Brent and Magnus fields are the result of traps formed by an unconformity truncation and a tilted fault block. Mobeetie field is the result of a trap indirectly related to a fault block. The anticline associated with the trap formed by differential compaction over a basement fault block. Red Oak field comprises traps both in a fault block and in an overlying anticline formed by differential compaction over the same fault block. With the exception of Cano Limon, all the fault blocks associated with these fields formed mainly under tensional stresses. The fault block associated with Cano Limon field formed by shearing in a strike-slip environment. Another aspect described in each field study is the history of its exploration and development.

Beaumont, E.A.; Foster, N.H.

1990-01-01T23:59:59.000Z

50

Evaporation of Lava and its Condensation from the Vapour Phase in Terrestrial and Lunar Volcanism  

Science Journals Connector (OSTI)

... appearance to the clouds of white steam from erupting geysers and from heated pools in geothermal areas. The resemblance between the steam clouds and the volcanic clouds is so pronounced ... is little doubt that they are formed by a similar mechanism. It appears that the hot lava has a high enough vapour pressure for appreciable quantities of it to evaporate. ...

BERNARD VONNEGUT; ROBERT K. MCCONNELL; RONALD V. ALLEN

1966-01-29T23:59:59.000Z

51

on marsGraduate student discovers new form of lava flow on Mars  

E-Print Network [OSTI]

astronomical event so don't miss it. Meet at Tempe Town Lake. Flying on The VomiT ComeT The Dust Devils Hapke2012.pdf Mapping the apollo 17 landing site area based on lunar reconnaissance orbiter caMera i

Rhoads, James

52

Evidence from lava flows for complex polarity transitions: the new composite Steens Mountain reversal record  

Science Journals Connector (OSTI)

......Catlow 13 (C13). PN Group 3 (PN3) is placed between...clustering, PN7 and PN8 fall after S31 before the...Catlow paths. The next groups from Poker Jim North...Cascade Range and the Klamath Mountains, Geology...1995. Combining groups of paleomagnetic directions......

Nicholas A. Jarboe; Robert S. Coe; Jonathan M.G. Glen

2011-08-01T23:59:59.000Z

53

Evidence from lava flows for complex polarity transitions: the new composite Steens Mountain reversal record  

Science Journals Connector (OSTI)

......2004), which could be run for long enough to encompass...driven by a hand-held gasoline powered drill. The cores...temperature curves, run in argon atmosphere...ChRM was determined with straight-line fits anchored...directions determined from straight-line fits to demagnetization......

Nicholas A. Jarboe; Robert S. Coe; Jonathan M.G. Glen

2011-08-01T23:59:59.000Z

54

Coherence in Microchip Traps  

Science Journals Connector (OSTI)

We report the coherent manipulation of internal states of neutral atoms in a magnetic microchip trap. Coherence lifetimes exceeding 1s are observed with atoms at distances of 5130????m from the microchip surface. The coherence lifetime in the chip trap is independent of atom-surface distance within our measurement accuracy and agrees well with the results of similar measurements in macroscopic magnetic traps. Because of the absence of surface-induced decoherence, a miniaturized atomic clock with a relative stability in the 10-13 range can be realized. For applications in quantum information processing, we propose to use microwave near fields in the proximity of chip wires to create potentials that depend on the internal state of the atoms.

Philipp Treutlein; Peter Hommelhoff; Tilo Steinmetz; Theodor W. Hnsch; Jakob Reichel

2004-05-21T23:59:59.000Z

55

Asymmetric ion trap  

DOE Patents [OSTI]

An ion trap having two end cap electrodes disposed asymmetrically about a center of a ring electrode is disclosed. The inner surface of the end cap electrodes are conformed to an asymmetric pair of equipotential lines of the harmonic formed by the application of voltages to the electrodes. The asymmetry of the end cap electrodes allows ejection of charged species through the closer of the two electrodes which in turn allows for simultaneously detecting anions and cations expelled from the ion trap through the use of two detectors charged with opposite polarity. 4 figs.

Barlow, S.E.; Alexander, M.L.; Follansbee, J.C.

1997-12-02T23:59:59.000Z

56

Asymmetric ion trap  

DOE Patents [OSTI]

An ion trap having two end cap electrodes disposed asymmetrically about a center of a ring electrode. The inner surface of the end cap electrodes are conformed to an asymmetric pair of equipotential lines of the harmonic formed by the application of voltages to the electrodes. The asymmetry of the end cap electrodes allows ejection of charged species through the closer of the two electrodes which in turn allows for simultaneously detecting anions and cations expelled from the ion trap through the use of two detectors charged with opposite polarity.

Barlow, Stephan E. (Richland, WA); Alexander, Michael L. (Richland, WA); Follansbee, James C. (Pasco, WA)

1997-01-01T23:59:59.000Z

57

Venus Fly Trap Experiment  

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

Venus Fly Trap Experiment Venus Fly Trap Experiment Name: Jeremy Bailey Status: N/A Age: N/A Location: N/A Country: N/A Date: N/A Question: My name is Jeremy Bailey, and I am a student of Dorseyville Middle School. I have been working on a science project about Venus' Fly Traps. A recent addition to the project involved designing an experiment about something I found interesting about them. However, I don't know where to get them or how to grow them in the moderate climate of Pittsburgh. Also, I don't know how a successful experiment could be designed. Replies: Jeremy, I believe Venus Fly traps can be found 'in the wild' in the coastal floodplain of the Carolinas. As far as where to buy them, look in the phonebook yellow pages under plants or houseplants and do some calling. I live in eastern Pennsylvania, and over here they even sell them in hardware stores like Hechinger's and Home Depot (in their garden departments). I don't think you will have luck trying to grow them outside, our winters here are a bit too harsh for them. From what I recall they require substantial moisture and more moderate climes. You might try looking for houseplant books at your local library for more detailed information.

58

Nuclear Physics with trapped  

E-Print Network [OSTI]

Nuclear Physics with trapped atoms and ions #12;2/2/2013Dan Melconian #12;2/2/2013Dan Melconian Outline · Scope and applications of nuclear physics precision frontier compliments LHC properties and aquifers in the Sahara #12;2/2/2013Dan Melconian What is Nuclear Physics? · Began with the study

Boas, Harold P.

59

Magnetic trap for thulium atoms  

SciTech Connect (OSTI)

For the first time ultra-cold thulium atoms were trapped in a magnetic quadrupole trap with a small field gradient (20 Gs cm{sup -1}). The atoms were loaded from a cloud containing 4x10{sup 5} atoms that were preliminarily cooled in a magneto-optical trap to the sub-Doppler temperature of 80 {mu}K. As many as 4x10{sup 4} atoms were trapped in the magnetic trap at the temperature of 40 {mu}K. By the character of trap population decay the lifetime of atoms was determined (0.5 s) and an upper estimate was obtained for the rate constant of inelastic binary collisions for spin-polarised thulium atoms in the ground state (g{sub in} < 10{sup -11}cm{sup 3} s{sup -1}). (magnetic traps)

Sukachev, D D; Sokolov, A V; Chebakov, K A; Akimov, A V; Kolachevskii, N N; Sorokin, Vadim N [P N Lebedev Physical Institute, Russian Academy of Sciences, Moscow (Russian Federation)

2011-08-31T23:59:59.000Z

60

Trapping and cooling He(2{sup 3}S) metastable atoms  

SciTech Connect (OSTI)

A magneto-optical trap for He(2{sup 3}S) metastable atoms has been constructed, utilizing superconducting magnetic gradient coils and a Ti:Sapphire ring laser for pumping the helium 2{sup 3}S-2{sup 3}P transition. The He(2{sup 3}S) atoms are produced by a weak rf discharge in helium gas at a temperature of 1.4K. The discharge products flow through a small orifice into the trap cell, where a fraction of the He(2{sup 3}S) atoms are trapped and ground state helium atoms are rapidly cryopumped by zeolite pellets that cover most of the cell bottom. Preliminary experiments suggest that {approximately}10{sup 6} atoms are trapped in a small volume at {approximately}1 mK, with a trap lifetime of 10-100 msec limited by resonantly-enhanced He(2{sup 3}S)-He(2{sup 3}P) Penning reactions. Ultimately, it is estimated that a substantial number of atoms can be held at ultra-low temperature in near-perfect vacuum, in a dc magnetic trap. Measurements of decay times of the trapped atoms should yield rate coefficients in the quantum regime for He(2{sup 3}S)-He(2{sup 3}P) and He(2{sup 3}S)-He(2{sup 3}S) Penning reactions, and perhaps the He(2{sup 3}S) radiative lifetime.

Zhao, X.; Soletsky, P.A.; Bryan, W.H.; Ling, X. [and others

1993-05-01T23:59:59.000Z

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


61

The Elimination of Steam Traps  

E-Print Network [OSTI]

claims and misinformation gener ated by over thirty-six steam trap manufacturers in the United States alone. A PARTIAL LIST OF STEAM TRAP MANUFACTURERS AAF GESTRA ANDERSON HIROSS ARMSTRONG HOFFMAN BARNES &JONES HONEYWELL BRAUKMANN BESTOBELL... removal had been devised and these same methods, with minor variations, are employed today. The inverted bucket trap was in vented in 1910 by Otto Arner, a friend of Adam Armstrong. Armstrong began his business career by making bicycle spokes...

Dickman, F.

62

Inspect and Repair Steam Traps  

Broader source: Energy.gov [DOE]

This tip sheet on inspecting and repairing steam traps provides how-to advice for improving industrial steam systems using low-cost, proven practices and technologies.

63

Trapping triply ionized thorium isotopes.  

E-Print Network [OSTI]

??Cold trapped ions have many applications in quantum information science and precision metrology. In this thesis, we present progress toward two objectives involving ions confined (more)

Churchill, Layne Russell

2010-01-01T23:59:59.000Z

64

Electron Trapping by Molecular Vibration  

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

Electron Trapping by Molecular Vibration Print In photoelectron spectroscopy experiments performed at the ALS, a group of researchers has found that electronic transitions normally...

65

Optical Trapping Platform Based on Highly Confining Silicon Waveguiding Structures with Microfluidics  

Science Journals Connector (OSTI)

We demonstrate strongly enhanced optical trapping forces on sub-micron-diameter dielectric spheres within a pressure-driven microfluidic flow of several hundred microns/s using the...

Schmidt, Bradley; Manipatruni, Sasikanth; Yang, Allen H; Erickson, David; Lipson, Michal

66

Vibration-induced mobilization of trapped non-aqueous phase liquids in porous media.  

E-Print Network [OSTI]

??Acoustic wave stimulation, such as vibration-induced mobilization, is a promising enhancement approach to remove trapped NAPLs (Non-Aqueous Phase Liquids) usually encountered in multiphase flows through (more)

Li, Wenqing

2006-01-01T23:59:59.000Z

67

Cryogenic Ion Trapping Systems with Surface-Electrode Traps  

E-Print Network [OSTI]

We present two simple cryogenic RF ion trap systems in which cryogenic temperatures and ultra high vacuum pressures can be reached in as little as 12 hours. The ion traps are operated either in a liquid helium bath cryostat or in a low vibration closed cycle cryostat. The fast turn around time and availability of buffer gas cooling made the systems ideal for testing surface-electrode ion traps. The vibration amplitude of the closed cycled cryostat was found to be below 106 nm. We evaluated the systems by loading surface-electrode ion traps with $^{88}$Sr$^+$ ions using laser ablation, which is compatible with the cryogenic environment. Using Doppler cooling we observed small ion crystals in which optically resolved ions have a trapped lifetime over 2500 minutes.

P. B. Antohi; D. Schuster; G. M. Akselrod; J. Labaziewicz; Y. Ge; Z. Lin; W. S. Bakr; I. L. Chuang

2008-07-29T23:59:59.000Z

68

Cryogenic silicon surface ion trap  

E-Print Network [OSTI]

Trapped ions are pre-eminent candidates for building quantum information processors and quantum simulators. They have been used to demonstrate quantum gates and algorithms, quantum error correction, and basic quantum simulations. However, to realise the full potential of such systems and make scalable trapped-ion quantum computing a reality, there exist a number of practical problems which must be solved. These include tackling the observed high ion-heating rates and creating scalable trap structures which can be simply and reliably produced. Here, we report on cryogenically operated silicon ion traps which can be rapidly and easily fabricated using standard semiconductor technologies. Single $^{40}$Ca$^+$ ions have been trapped and used to characterize the trap operation. Long ion lifetimes were observed with the traps exhibiting heating rates as low as $\\dot{\\bar{n}}=$ 0.33 phonons/s at an ion-electrode distance of 230 $\\mu$m. These results open many new avenues to arrays of micro-fabricated ion traps.

Michael Niedermayr; Kirill Lakhmanskiy; Muir Kumph; Stefan Partel; Johannes Edlinger; Michael Brownnutt; Rainer Blatt

2014-03-20T23:59:59.000Z

69

An automated hydride generation-cryogenic trapping-ICP-MS system for measuring inorganic and methylated Ge, Sb and As species  

E-Print Network [OSTI]

An automated hydride generation-cryogenic trapping-ICP-MS system for measuring inorganic of both flow injection and batch hydride generation and couples it to an automated cryogenic trapping unit with detection by ICP-MS. The Teflon cryogenic trap was packed with 10 cm of SE-30 5% Chromosorb W-HP 80­100 mesh

Canberra, University of

70

Vibrational relaxation of trapped molecules  

Science Journals Connector (OSTI)

Vibrational relaxation of trapped molecules due to collisions with cold atoms is investigated using the results of quantum-mechanical scattering calculations. Trap loss is analyzed using an exactly solvable kinetic model that includes direct collisional quenching and an indirect process of vibrational predissociation. At low atom density, the relaxation is due primarily to collisional quenching. At high atom density, the relaxation involves additional time scales due to the formation and decay of van der Waals complexes. It is shown that the most weakly bound state of the van der Waals complex for a given diatomic vibrational level controls the relaxation at all atom densities. Possible experiments using trapped molecules are discussed.

R. C. Forrey; V. Kharchenko; N. Balakrishnan; A. Dalgarno

1999-03-01T23:59:59.000Z

71

Mini ion trap mass spectrometer  

DOE Patents [OSTI]

An ion trap is described which operates in the regime between research ion traps which can detect ions with a mass resolution of better than 1:10{sup 9} and commercial mass spectrometers requiring 10{sup 4} ions with resolutions of a few hundred. The power consumption is kept to a minimum by the use of permanent magnets and a novel electron gun design. By Fourier analyzing the ion cyclotron resonance signals induced in the trap electrodes, a complete mass spectra in a single combined structure can be detected. An attribute of the ion trap mass spectrometer is that overall system size is drastically reduced due to combining a unique electron source and mass analyzer/detector in a single device. This enables portable low power mass spectrometers for the detection of environmental pollutants or illicit substances, as well as sensors for on board diagnostics to monitor engine performance or for active feedback in any process involving exhausting waste products. 10 figs.

Dietrich, D.D.; Keville, R.F.

1995-09-19T23:59:59.000Z

72

Mini ion trap mass spectrometer  

DOE Patents [OSTI]

An ion trap which operates in the regime between research ion traps which can detect ions with a mass resolution of better than 1:10.sup.9 and commercial mass spectrometers requiring 10.sup.4 ions with resolutions of a few hundred. The power consumption is kept to a minimum by the use of permanent magnets and a novel electron gun design. By Fourier analyzing the ion cyclotron resonance signals induced in the trap electrodes, a complete mass spectra in a single combined structure can be detected. An attribute of the ion trap mass spectrometer is that overall system size is drastically reduced due to combining a unique electron source and mass analyzer/detector in a single device. This enables portable low power mass spectrometers for the detection of environmental pollutants or illicit substances, as well as sensors for on board diagnostics to monitor engine performance or for active feedback in any process involving exhausting waste products.

Dietrich, Daniel D. (Livermore, CA); Keville, Robert F. (Valley Springs, CA)

1995-01-01T23:59:59.000Z

73

Novel Dipole Trapped Spheromak Configuration  

Science Journals Connector (OSTI)

We report the observation and characterization of a spheromak formed in the Swarthmore Spheromak Experiment (SSX) and trapped in a simple dipole magnetic field. The spheromak is studied in the prolate (tilt unsta...

M. R. Brown; C. D. Cothran; J. Fung; M. J. Schaffer; E. Belova

2007-06-01T23:59:59.000Z

74

Rainbow trapping of guided waves  

E-Print Network [OSTI]

Rainbow trapping of guided waves Javier Polanco and Rosa M.the propagation of a wave packet that is a superpositionof three s-polarized guided waves with different frequencies

Polanco, Javier; Fitzgerald, Rosa M; Leskova, Tamara A; Maradudin, Alexei A

2011-01-01T23:59:59.000Z

75

Quantum Engineering with Trapped Ions  

Science Journals Connector (OSTI)

We describe how to manipulate, and characterize the motional state of a trapped ion. We also give a method to measure an arbitrary motional observable in a single shot.

J. F. Poyatos; S. A. Gardiner; R. Walser

1997-01-01T23:59:59.000Z

76

Electron Trapping by Molecular Vibration  

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

Electron Trapping by Molecular Vibration Print Electron Trapping by Molecular Vibration Print In photoelectron spectroscopy experiments performed at the ALS, a group of researchers has found that electronic transitions normally thought to be forbidden can in fact be excited in conjunction with certain types of molecular vibrations. Specifically, they found that when the symmetry of a linear triatomic molecule is broken by asymmetric vibrational modes, photoelectrons can become temporarily trapped by the molecule before ultimately escaping, giving rise to a broad feature in the photoelectron spectrum known as a shape resonance. This process represents a novel type of symmetry-breaking phenomenon that has not been observed previously but appears to be widespread. Such coupling between electronic motion and nuclear motion becomes increasingly important as scientists learn more about the geometry and dynamics of novel chemical structures such as those found in nanodevices and transient chemical species, and the results have implications for studies that use photoelectron spectroscopy as a diagnostic tool.

77

Electron Trapping by Molecular Vibration  

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

Electron Trapping by Molecular Vibration Print Electron Trapping by Molecular Vibration Print In photoelectron spectroscopy experiments performed at the ALS, a group of researchers has found that electronic transitions normally thought to be forbidden can in fact be excited in conjunction with certain types of molecular vibrations. Specifically, they found that when the symmetry of a linear triatomic molecule is broken by asymmetric vibrational modes, photoelectrons can become temporarily trapped by the molecule before ultimately escaping, giving rise to a broad feature in the photoelectron spectrum known as a shape resonance. This process represents a novel type of symmetry-breaking phenomenon that has not been observed previously but appears to be widespread. Such coupling between electronic motion and nuclear motion becomes increasingly important as scientists learn more about the geometry and dynamics of novel chemical structures such as those found in nanodevices and transient chemical species, and the results have implications for studies that use photoelectron spectroscopy as a diagnostic tool.

78

Benchmark Reaction Mechanisms and Kinetics for Lean NOx Traps...  

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

Benchmark Reaction Mechanisms and Kinetics for Lean NOx Traps Development of Chemical Kinetic Models for Lean NOx Traps Modeling the Regeneration Chemistry of Lean NOx Traps...

79

Electron Trapping by Molecular Vibration  

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

Electron Trapping by Molecular Electron Trapping by Molecular Vibration Electron Trapping by Molecular Vibration Print Wednesday, 27 April 2005 00:00 In photoelectron spectroscopy experiments performed at the ALS, a group of researchers has found that electronic transitions normally thought to be forbidden can in fact be excited in conjunction with certain types of molecular vibrations. Specifically, they found that when the symmetry of a linear triatomic molecule is broken by asymmetric vibrational modes, photoelectrons can become temporarily trapped by the molecule before ultimately escaping, giving rise to a broad feature in the photoelectron spectrum known as a shape resonance. This process represents a novel type of symmetry-breaking phenomenon that has not been observed previously but appears to be widespread. Such coupling between electronic motion and nuclear motion becomes increasingly important as scientists learn more about the geometry and dynamics of novel chemical structures such as those found in nanodevices and transient chemical species, and the results have implications for studies that use photoelectron spectroscopy as a diagnostic tool.

80

Inertial measurement via dynamics of trapped particles  

E-Print Network [OSTI]

We describe theoretical and practical aspects of the particle trap as an inertial sensor. The insight motivating this approach is that a trapped particle acts like a mass on a spring, but the restoring forces are provided ...

Post, E. Rehmi, 1966-

2003-01-01T23:59:59.000Z

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


81

Carbon Nanotubes in an Optical Trap  

Science Journals Connector (OSTI)

Study of carbon nanotubes (CNTs) in a single beam optical trap (1064 nm) was done. In the optical trap, repulsion of the CNTS from the laser radiation, bubble formation, broad band...

Ramanandan, Gopika; Dharmadhikari, Aditya K; Ramachandran, Hema; Dharmadhikari, Jayasree A; Mathur, Deepak

82

Condensation of Excitons in a Trap  

Science Journals Connector (OSTI)

Condensation is observed in a gas of indirect excitons confined in an electrostatic trap. Imaging and interferometric measurements detect that excitons condense at the trap bottom and exciton spontaneous coherence emerges with lowering temperature. Below ...

A. A. High; J. R. Leonard; M. Remeika; L. V. Butov; M. Hanson; A. C. Gossard

2012-04-17T23:59:59.000Z

83

Investigating the reasons for the failure of palaeointensity experiments: a study on historical lava flows from Mt. Etna (Italy)  

Science Journals Connector (OSTI)

......Solid symbols are for heating, open symbols for...When observed under oil at the largest magnifications...carried out under oil. (a) Type M sample...or produced during heating. It should be nevertheless...determinations. The price for this advantage...acquired after heating of a sample to T......

Manuel Calvo; Michel Prvot; Mireille Perrin; Janna Riisager

2002-04-01T23:59:59.000Z

84

Physics of the Earth and Planetary Interiors 133 (2002) 127146 Palaeomagnetic study of Oligocene (2430 Ma) lava flows from  

E-Print Network [OSTI]

Physics of the Earth and Planetary Interiors 133 (2002) 127­146 Palaeomagnetic study of Oligocene previously obtained radiometric dates to correlate the sections [J. Petrol. 39 (4) (1998) 711; Earth Planet the composi- tion and dynamics of the Earth's core directly, one indirect method is to study the Earth

Demouchy, Sylvie

85

Review of Orifice Plate Steam Traps  

Broader source: Energy.gov [DOE]

This guide was prepared to serve as a foundation for making informed decisions about when orifice plate steam traps should be considered for use in new or existing steam systems. It presents background information about different types of steam traps and defines their unique functional and operational characteristics. The advantages and disadvantages associated with using orifice plate steam traps are provided to highlight their capabilities and limitations. Finally, recommendations for using orifice plate steam traps are presented, and possible applications are identified.

86

Optical trapping for undergraduates D. C. Appleyard  

E-Print Network [OSTI]

Optical trapping for undergraduates D. C. Appleyard Department of Biological Engineering September 2006 The detailed design of a robust and inexpensive optical trap system is presented. The system experimental modules are described to cover basic concepts in optical trapping and biophysics at a level

Lang, Matthew

87

Finite element simulations of hydrodynamic trapping in microfluidic particle-trap array systems  

E-Print Network [OSTI]

Finite element simulations of hydrodynamic trapping in microfluidic particle- trap array systems;Finite element simulations of hydrodynamic trapping in microfluidic particle-trap array systems Xiaoxiao) simulation is a powerful tool in the design and implementation of microfluidic systems, especially

Nehorai, Arye

88

Trends in Purge and Trap  

Science Journals Connector (OSTI)

......methods and hardware capable of handling the wide array of sample matrices...follows first- Figure 1. Flow diagrams: A, purge (extraction...become important reference material as the list of analytes performed...columns, and Figure 7. Flow diagram of the capillary split injection......

Scott M. Abeel; Allen K. Vickers; Daron Decker

1994-08-01T23:59:59.000Z

89

Capturing Energy Savings with Steam Traps  

E-Print Network [OSTI]

Capturing Energy Savings with Steam Traps Richard C; Bockwinkel General Manager Armstrong Service? A Division of Armstrong International, Inc. Orlando, Florida ABSTRACT This paper will discuss the energy savings potential of steam... Engineer Steam Traps Armstrong International, Inc. Three Rivers, Michigan basis. Finally, it's important to recognize that a steam trap program will reduce steam waste> which will reduce the amount of fuel burned> which will reduce pollutants...

Bockwinkel, R. G.; French, S. A.

90

Reduce Steam Trap Failures at Chambers Works  

E-Print Network [OSTI]

Ultrasonic Inspection At least 2 times per year Steam Trap Surveyor Submit reports to area management, energy team, and reliability engineers for each area every month Steam Trap Team Leader Control Plan ? Process Owner agrees...Reduce Steam Trap Failures at Chambers Works GB/BB Name: Cyndi Kouba Mentor/MBB: Andrew Degraff Team Members Michael Crowley(Site Energy Lead), (Charlie) Flanigan (Aramids-maintenance), Ben Snyder (Aramids-ATO), Michael Scruggs (Central...

Kouba, C.

91

Dipole trapped spheromak in a prolate flux conserver  

Science Journals Connector (OSTI)

This paper reports the observation and characterization of a spheromak formed in the Swarthmore Spheromak Experiment (SSX [M. R. Brown Phys. Plasmas6 1717 (1999)]) and trapped in a simple dipole magnetic field. The spheromak is studied in a prolate (tilt unstable) 0.4 m diameter 0.6 m length copper flux conserver in SSX. This plasma does not tilt despite the prolate flux conserver. The spheromak is characterized by a suite of magnetic probe arrays for magnetic structure B ( r t ) ion Doppler spectroscopy for T i and flow and interferometry for n e . Three-dimensional magnetohydrodynamics simulations of this configuration verify its gross sta-bility.

M. R. Brown; C. D. Cothran; J. Fung; M. Chang; J. Horwitz; M. J. Schaffer; J. Leuer; E. V. Belova

2006-01-01T23:59:59.000Z

92

A Study of the Forcing of the 2225 June 2006 Coastally Trapped Wind Reversal Based on Numerical Simulations and Aircraft Observations  

E-Print Network [OSTI]

Coastally trapped wind reversals (CTWRs) occur periodically in the lowest several hundred meters of the marine boundary layer west of California and disrupt the northerly flow that typically occurs during summer. South ...

Rahn, David A.; Parish, Thomas R.

2008-12-01T23:59:59.000Z

93

Plant View On Reducing Steam Trap Energy Loss  

E-Print Network [OSTI]

of the steam traps are passing excess steam. This is caused by neglect of aged steam traps which have worn out and misapplication of steam traps by oversizing or using the 'wrong' type trap. Elimination of steam wastes by an effective well engineered steam trap...

Vallery, S. J.

1982-01-01T23:59:59.000Z

94

Effect of trapping on transport coherence  

Science Journals Connector (OSTI)

Influence of a trap (sink) on exciton transfer in molecular aggregates is investigated. Memory functions entering the generalized master equations are calculated. The presence of the sink changes their analytical form. We used the sink in trimers as an example to show that for large trapping-rate parameters the rest of the system is decoupled from the sink.

Ivan Barvk and Pavel Heman

1992-02-01T23:59:59.000Z

95

Entangled states of trapped atomic ions  

Science Journals Connector (OSTI)

... typical experiment involves trapping a few ions by using a combination of static and sinusoidally oscillating electric potentials that are applied between the electrodes of a linear quadrupole, an arrangement ... Fig. 1). When the trapped ions are laser cooled, they form a linear 'string', in which the spacings are determined by a balance between the horizontal (axial) ...

Rainer Blatt; David Wineland

2008-06-18T23:59:59.000Z

96

Flow Dynamics and Plasma Heating of Spheromaks in SSX  

Science Journals Connector (OSTI)

We report several new experimental results related to flow dynamics and heating from single dipole-trapped spheromaks and spheromak merging studies at SSX. Single spheromaks (...Phys. Plasmas 13 1...

M. R. Brown; C. D. Cothran; D. H. Cohen; J. Horwitz; V. Chaplin

2008-06-01T23:59:59.000Z

97

Standard Model tests with trapped radioactive atoms  

E-Print Network [OSTI]

We review the use of laser cooling and trapping for Standard Model tests, focusing on trapping of radioactive isotopes. Experiments with neutral atoms trapped with modern laser cooling techniques are testing several basic predictions of electroweak unification. For nuclear $\\beta$ decay, demonstrated trap techniques include neutrino momentum measurements from beta-recoil coincidences, along with methods to produce highly polarized samples. These techniques have set the best general constraints on non-Standard Model scalar interactions in the first generation of particles. They also have the promise to test whether parity symmetry is maximally violated, to search for tensor interactions, and to search for new sources of time reversal violation. There are also possibilites for exotic particle searches. Measurements of the strength of the weak neutral current can be assisted by precision atomic experiments using traps of small numbers of radioactive atoms, and sensitivity to possible time-reversal violating electric dipole moments can be improved.

J. A. Behr; G. Gwinner

2009-03-04T23:59:59.000Z

98

Characterization of Trapped Lignin-Degrading Microbes in Tropical...  

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

Trapped Lignin-Degrading Microbes in Tropical Forest Soil. Characterization of Trapped Lignin-Degrading Microbes in Tropical Forest Soil. Abstract: Lignin is often the most...

99

H2-Assisted NOx Traps: Test Cell Results Vehicle Installations...  

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

H2-Assisted NOx Traps: Test Cell Results Vehicle Installations H2-Assisted NOx Traps: Test Cell Results Vehicle Installations 2003 DEER Conference Presentation: ArvinMeritor...

100

H2-Assisted NOx Traps: Test Cell Results Vehicle Installations  

Broader source: Energy.gov (indexed) [DOE]

Sam Crane August 28, 2003 H 2 -Assisted NOx Traps: Test Cell Results Vehicle Installations 2 Project Objectives * Determine Advantages of H 2 Assisted NO x Trap Regeneration *...

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


101

NOx Adsorber (Lean NOx Trap) Fundamentals (Agreement #10049 ...  

Broader source: Energy.gov (indexed) [DOE]

NOx Adsorber (Lean NOx Trap) Fundamentals (Agreement 10049 - PNNL Project 47120) NOx Adsorber (Lean NOx Trap) Fundamentals (Agreement 10049 - PNNL Project 47120) Presentation...

102

Modeling the Regeneration Chemistry of Lean NOx Traps | Department...  

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

the Regeneration Chemistry of Lean NOx Traps Modeling the Regeneration Chemistry of Lean NOx Traps Presentation given at DEER 2006, August 20-24, 2006, Detroit, Michigan. Sponsored...

103

Post-eruptive alteration of silicic ignimbrites and lavas, Gran Canaria, Canary Islands: Strontium, neodymium, lead, and oxygen isotopic evidence  

SciTech Connect (OSTI)

Isotopic analyses of Miocene comenditic, pantelleritic, and trachyphonolitic ignimbrites and lavas from Gran Canaria, Canary Islands, provide evidence for posteruptive mobility of Rb, Sr, and O. Calculated initial [sup 87]Sr/[sup 86]Sr ratios in whole-rock samples from basaltic lavas and feldspar mineral separates from ignimbrites define a magmatic trend in the stratigraphic section, from ratios of 0.70340 at the base of the Mogan Formation to 0.70305 in the lower Fataga Formation. However, calculated apparent initial [sup 87]Sr/[sup 86]Sr ratios in hydrated vitrophyre and devitrified matrix separates range from 0.7035 to 0.7090. [delta][sup 18]O ratios in basalts and feldspars vary little, from +5.7 to +6.1, yet range from +6.5 to +15.0 in the ignimbrite matrices. In contrast to the Sr and O isotope ratios, Pb and Nd isotope ratios are identical within analytical error in feldspars and their silicic ignimbrite matrices. Sequential leaching experiments and the oxygen data suggest that low-temperature, posteruptive interaction with meteoric water, perhaps containing a small seawater component, has modified Rb and Sr concentrations in the matrices, such that calculated apparent initial [sup 87]Sr/[sup 86]Sr ratios are not those of the magmas when they were erupted. Mobilization of Rb and Sr must occur significantly after eurption. Nd and Pb isotope systems appear to be unaffected by this process. Therefore, [sup 87]Sr/[sup 86]Sr ratios determined by whole rock analysis of silicic rocks from hotspot-type oceanic islands are suspect and should not be incorporated into mantle tracer studies, although analysis of phenocrysts may produce useful data. 40 refs., 5 figs., 3 tabs.

Cousens, B.L. (Universite de Montreal, Quebec (Canada)); Spera, F.J. (Univ. of California, Santa Barbara (United States)); Dobson, P.F. (Unocal Corp., Brea, CA (United States))

1993-02-01T23:59:59.000Z

104

Steam Trap Maintenance as a Profit Center  

E-Print Network [OSTI]

the Eighteenth Industrial Energy Technology Conference, Houston, TX, April 17-18, 1996 EXCUSES Everybody thinks his or her steam trap maintenance is good. Surveysl have shown the following are the most popular excuses encountered when managers are confronted... for steam traps. 192 ESL-IE-96-04-28 Proceedings from the Eighteenth Industrial Energy Technology Conference, Houston, TX, April 17-18, 1996 5. Set up a trap maintenance program C. Prepare and present a report to that will: management on the results...

Bouchillon, J. L.

105

Compact RF resonator for cryogenic ion traps  

E-Print Network [OSTI]

We report on the investigation and implementation of a lumped-component, radio-frequency resonator used in a cryogenic vacuum environment to drive an ion trap. The resonator was required to achieve the voltages necessary to trap (about 100 V), while dissipating as little power as possible (< 250 mW). Ultimately a voltage gain of 100 was measured at 5.7 K. Single calcium ions were confined in a trap driven by this device, providing proof of successful resonator operation at low temperature.

D. Gandolfi; M. Niedermayr; M. Kumph; M. Brownnutt; R. Blatt

2012-04-23T23:59:59.000Z

106

Nonlinear Spectroscopy of Trapped Ions  

E-Print Network [OSTI]

Nonlinear spectroscopy employs a series of laser pulses to interrogate dynamics in large interacting many-body systems, and has become a highly successful method for experiments in chemical physics. Current quantum optical experiments approach system sizes and levels of complexity which require the development of efficient techniques to assess spectral and dynamical features with scalable experimental overhead. However, established methods from optical spectroscopy of macroscopic ensembles cannot be applied straightforwardly to few-atom systems. Based on the ideas proposed in [M. Gessner et al. New J. Phys. 16 092001 (2014)], we develop a diagrammatic approach to construct nonlinear measurement protocols for controlled quantum systems and discuss experimental implementations with trapped ion technology in detail. These methods in combination with distinct features of ultra-cold matter systems allow us to monitor and analyze excitation dynamics in both the electronic and vibrational degrees of freedom. They are independent of system size, and can therefore reliably probe systems where, e.g., quantum state tomography becomes prohibitively expensive. We propose signals that can probe steady state currents, detect the influence of anharmonicities on phonon transport, and identify signatures of chaotic dynamics near a quantum phase transition in an Ising-type spin chain.

Frank Schlawin; Manuel Gessner; Shaul Mukamel; Andreas Buchleitner

2014-10-07T23:59:59.000Z

107

The Canadian Penning Trap Spectrometer at Argonne  

Science Journals Connector (OSTI)

The Canadian Penning Trap (CPT) mass spectrometer is a device used for high-precision mass measurements on short-lived isotopes. It is located at the ATLAS superconducting heavy-ion linac facility where a nove...

G. Savard; R. C. Barber; C. Boudreau

2001-01-01T23:59:59.000Z

108

The Canadian Penning Trap Spectrometer at Argonne  

Science Journals Connector (OSTI)

The Canadian Penning Trap (CPT) mass spectrometer is a device used for high-precision mass measurements on short-lived isotopes. It is located at the ATLAS superconducting heavy-ion linac facility where a nove...

G. Savard; R. C. Barber; C. Boudreau; F. Buchinger; J. Caggiano

109

pH-biased isoelectric trapping separations  

E-Print Network [OSTI]

The classical isoelectric trapping (IET) technique, using the multicompartment electrolyzer (MCE), has been one of the most successful electrophoretic techniques in preparative-scale protein separations. IET is capable of achieving high resolution...

Shave, Evan Eric

2006-10-30T23:59:59.000Z

110

Shale gas is natural gas trapped inside  

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

Shale gas is natural gas trapped inside formations of shale - fine grained sedimentary rocks that can be rich sources of petroleum and natural gas. Just a few years ago, much of...

111

Scaling the Ion Trap Quantum Processor  

Science Journals Connector (OSTI)

...atomic ion species to act as "refrigerator" ions to quench the...scale beyond the QCCD in a modular architecture, one can link separate...trapped ion technology. (A) Modular distributed...A major challenge in both modular quantum computer...

C. Monroe; J. Kim

2013-03-08T23:59:59.000Z

112

Energy Savings Through Steam Trap Management  

E-Print Network [OSTI]

Energy Savings through Steam Trap Management Chris Gibbs, Account Manager, Armstrong International, Inc., Three Rivers, MI ESL-IE-08-05-08 Proceedings from theThirtieth Industrial Energy Technology Conference...-based steam trap management application developed by Armstrong International. The application calculates steam loss, fuel loss, dollar loss and CO 2 emission generation. The database allows for trend analysis, automatic energy report generation...

Gibbs, C.

2008-01-01T23:59:59.000Z

113

Muon trapping at monovacancies in iron  

Science Journals Connector (OSTI)

Positive-muonspin-rotation experiments were performed on electron irradiated iron. A new defect-associated frequency is observed which is assigned to muons trapped at monovacancies. The hyperfine field at the vacancy site is -0.956 T at 140 K. The diffusion constant for ?+ in iron deduced from the trapping rate follows an Arrhenius law with an activation energy of 383 meV between 90 and 190 K.

A. Mslang; H. Graf; G. Balzer; E. Recknagel; A. Weidinger; Th. Wichert; R. I. Grynszpan

1983-03-01T23:59:59.000Z

114

Antihydrogen Trapped in the ALPHA Experiment  

ScienceCinema (OSTI)

In 2010 the ALPHA collaboration succeeded in trapping antihydrogen atoms for the first time.[i] Stored antihydrogen promises to be a unique tool for making high precision measurements of the structure of this first anti-atom. Achieving this milestone presented several substantial experimental challenges and this talk will describe how they were overcome. The unique design features of the ALPHA apparatus will be explained.[ii] These allow a high intensity positron source and an antiproton imaging detector similar to the one used in the ATHENA[iii] experiment to be combined with an innovative magnet design of the anti-atom trap. This seeks to minimise the perturbations to trapped charged particles which may cause particle loss and heating[iv]. The diagnostic techniques used to measure the diameter, number, density, and temperatures of both plasmas will be presented as will the methods developed to actively compress and cool of both plasma species to sizes and temperatures [v],[vi], [vii] where trapping attempts with a reasonable chance of success can be tried. The results of the successful trapping experiments will be outlined as well as some subsequent experiments to improve the trapping rate and storage time. [i] 'Trapped antihydrogen' G.B. Andresen et al., Nature 468, 673 (2010) [ii]'A Magnetic Trap for Antihydrogen Confinement' W. Bertsche et al., Nucl. Instr. Meth. Phys. Res. A566, 746 (2006) [iii] Production and detection of cold antihydrogen atoms M.Amoretti et al., Nature 419, 456 (2002). [iv]' Antihydrogen formation dynamics in a multipolar neutral anti-atom trap' G.B. Andresen et al., Phys. Lett. B 685, 141 (2010) [v]' Evaporative Cooling of Antiprotons to Cryogenic Temperatures', G.B. Andresen et al. Phys. Rev. Lett 105, 013003 (2010) [vi]'Compression of Antiproton Clouds for Antihydrogen Trapping' G. B. Andresen et al. Phys. Rev. Lett 100, 203401 (2008) [vii] 'Autoresonant Excitation of Antiproton Plasmas' G.B. Andresen et al., Phys. Rev. Lett. 106, 025002 (2011) Organizer: Ferdinand Hahn PH/DT Detector Seminar webpage

None

2011-04-25T23:59:59.000Z

115

Solar light trapping in slanted conical-pore photonic crystals: Beyond statistical ray trapping  

E-Print Network [OSTI]

Solar light trapping in slanted conical-pore photonic crystals: Beyond statistical ray trapping of AIP content is subject to the terms at: http://jap.aip.org/about/rights_and_permissions #12;Solar Street, Toronto, Ontario M5S 1A7, Canada (Received 8 October 2012; accepted 3 April 2013; published

John, Sajeev

116

Modular cryostat for ion trapping with surface-electrode ion traps  

E-Print Network [OSTI]

We present a simple cryostat purpose built for use with surface-electrode ion traps, designed around an affordable, large cooling power commercial pulse tube refrigerator. A modular vacuum enclosure with a single vacuum space facilitates interior access, and enables rapid turnaround and flexiblity for future modifications. Long rectangular windows provide nearly 360 degrees of optical access in the plane of the ion trap, while a circular bottom window near the trap enables NA 0.4 light collection without the need for in-vacuum optics. We evaluate the system's mechanical and thermal characteristics, and we quantify ion trapping performance by trapping 40Ca+, finding small stray electric fields, long ion lifetimes, and low ion heating rates.

Vittorini, Grahame; Brown, Kenneth R; Harter, Alexa W; Doret, S Charles

2013-01-01T23:59:59.000Z

117

Modular cryostat for ion trapping with surface-electrode ion traps  

Science Journals Connector (OSTI)

We present a simple cryostat purpose built for use with surface-electrode ion traps designed around an affordable large cooling power commercial pulse tube refrigerator. A modular vacuum enclosure with a single vacuum space facilitates interior access and enables rapid turnaround and flexibility for future modifications. Long rectangular windows provide nearly 360 of optical access in the plane of the ion trap while a circular bottom window near the trap enables NA 0.4 light collection without the need for in-vacuum optics. We evaluate the system's mechanical and thermal characteristics and we quantify ion trapping performance by trapping 40Ca+ finding small stray electric fields long ion lifetimes and low ion heating rates.

Grahame Vittorini; Kenneth Wright; Kenneth R. Brown; Alexa W. Harter; S. Charles Doret

2013-01-01T23:59:59.000Z

118

Modular cryostat for ion trapping with surface-electrode ion traps  

E-Print Network [OSTI]

We present a simple cryostat purpose built for use with surface-electrode ion traps, designed around an affordable, large cooling power commercial pulse tube refrigerator. A modular vacuum enclosure with a single vacuum space facilitates interior access, and enables rapid turnaround and flexiblity for future modifications. Long rectangular windows provide nearly 360 degrees of optical access in the plane of the ion trap, while a circular bottom window near the trap enables NA 0.4 light collection without the need for in-vacuum optics. We evaluate the system's mechanical and thermal characteristics, and we quantify ion trapping performance by trapping 40Ca+, finding small stray electric fields, long ion lifetimes, and low ion heating rates.

Grahame Vittorini; Kenneth Wright; Kenneth R. Brown; Alexa W. Harter; S. Charles Doret

2013-02-20T23:59:59.000Z

119

Trapping and aerogelation of nanoparticles in negative gravity hydrocarbon flames  

SciTech Connect (OSTI)

We report the experimental realization of continuous carbon aerogel production using a flame aerosol reactor by operating it in negative gravity (?g; up-side-down configuration). Buoyancy opposes the fuel and air flow forces in ?g, which eliminates convectional outflow of nanoparticles from the flame and traps them in a distinctive non-tipping, flicker-free, cylindrical flame body, where they grow to millimeter-size aerogel particles and gravitationally fall out. Computational fluid dynamics simulations show that a closed-loop recirculation zone is set up in ?g flames, which reduces the time to gel for nanoparticles by ?10{sup 6}?s, compared to positive gravity (upward rising) flames. Our results open up new possibilities of one-step gas-phase synthesis of a wide variety of aerogels on an industrial scale.

Chakrabarty, Rajan K., E-mail: rajan.chakrabarty@gmail.com [Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130 (United States); Laboratory for Aerosol Science, Spectroscopy, and Optics, Desert Research Institute, Nevada System of Higher Education, Reno, Nevada 89512 (United States); Novosselov, Igor V. [Department of Mechanical Engineering, University of Washington, Seattle, Washington 98195 (United States); Enertechnix Inc., Maple Valley, Washington 98068 (United States); Beres, Nicholas D.; Moosmller, Hans [Laboratory for Aerosol Science, Spectroscopy, and Optics, Desert Research Institute, Nevada System of Higher Education, Reno, Nevada 89512 (United States); Sorensen, Christopher M. [Condensed Matter Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506 (United States); Stipe, Christopher B. [TSI Incorporated, 500 Cardigan Rd, Shoreview, Minnesota 55126 (United States)

2014-06-16T23:59:59.000Z

120

Ball-grid array architecture for microfabricated ion traps  

E-Print Network [OSTI]

State-of-the-art microfabricated ion traps for quantum information research are approaching nearly one hundred control electrodes. We report here on the development and testing of a new architecture for microfabricated ion traps, built around ball-grid array (BGA) connections, that is suitable for increasingly complex trap designs. In the BGA trap, through-substrate vias bring electrical signals from the back side of the trap die to the surface trap structure on the top side. Gold-ball bump bonds connect the back side of the trap die to an interposer for signal routing from the carrier. Trench capacitors fabricated into the trap die replace area-intensive surface or edge capacitors. Wirebonds in the BGA architecture are moved to the interposer. These last two features allow the trap die to be reduced to only the area required to produce trapping fields. The smaller trap dimensions allow tight focusing of an addressing laser beam for fast single-qubit rotations. Performance of the BGA trap as characterized with $^{40}$Ca$^+$ ions is comparable to previous surface-electrode traps in terms of ion heating rate, mode frequency stability, and storage lifetime. We demonstrate two-qubit entanglement operations with $^{171}$Yb$^+$ ions in a second BGA trap.

Nicholas D. Guise; Spencer D. Fallek; Kelly E. Stevens; K. R. Brown; Curtis Volin; Alexa W. Harter; Jason M. Amini; Robert E. Higashi; Son Thai Lu; Helen M. Chanhvongsak; Thi A. Nguyen; Matthew S. Marcus; Thomas R. Ohnstein; Daniel W. Youngner

2014-12-19T23:59:59.000Z

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


121

Charge trapping in imidazolium ionic liquids  

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

trapping in imidazolium ionic liquids trapping in imidazolium ionic liquids I. A. Shkrob and J. F. Wishart J. Phys. Chem. B 113, 5582-5592 (2009). [Find paper at ACS Publications] or use ACS Articles on Request Abstract: Room-temperature ionic liquids (ILs) are a promising class of solvents for applications ranging from photovoltaics to solvent extractions. Some of these applications involve the exposure of the ILs to ionizing radiation, which stimulates interest in their radiation and photo- chemistry. In the case of ILs consisting of 1,3-dialkylimidazolium cations and hydrophobic anions, ionization, charge transfer and redox reactions yield charge-trapped species thought to be radicals resulting from neutralization of the constituent ions. Using computational chemistry methods and the recent results on electron spin resonance (ESR) and transient absorption

122

Cotton flow  

E-Print Network [OSTI]

Using the conformally invariant Cotton tensor, we define a geometric flow, the "Cotton flow", which is exclusive to three dimensions. This flow tends to evolve the initial metrics into conformally flat ones, and is somewhat orthogonal to the Yamabe flow, the latter being a flow within a conformal class. We define an entropy functional, and study the flow of nine homogeneous spaces both numerically and analytically. In particular, we show that the arbitrarily deformed homogeneous 3-sphere flows into the round 3-sphere. Two of the nine homogeneous geometries, which are degenerated by the Ricci flow, are left intact by the Cotton flow.

Ali Ulas Ozgur Kisisel; Ozgur Sarioglu; Bayram Tekin

2008-06-17T23:59:59.000Z

123

Cavity cooling of an optically trapped nanoparticle  

Science Journals Connector (OSTI)

We study the cooling of a dielectric nanoscale particle trapped in an optical cavity. We derive the frictional force for motion in the cavity field and show that the cooling rate is proportional to the square of oscillation amplitude and frequency. Both the radial and axial components of the center-of-mass motion of the trapped particle, which are coupled by the cavity field, are cooled. This motion is analogous to two coupled but damped pendulums. Our simulations show that the nanosphere can be cooled to e-1 of its initial momentum over time scales of hundredths of milliseconds.

P. F. Barker and M. N. Shneider

2010-02-23T23:59:59.000Z

124

Thermal electric vapor trap arrangement and method  

DOE Patents [OSTI]

A technique for trapping vapor within a section of a tube is disclosed herein. This technique utilizes a conventional, readily providable thermal electric device having a hot side and a cold side and means for powering the device to accomplish this. The cold side of this device is positioned sufficiently close to a predetermined section of the tube and is made sufficiently cold so that any condensable vapor passing through the predetermined tube section is condensed and trapped, preferably within the predetermined tube section itself. 4 figs.

Alger, T.

1988-03-15T23:59:59.000Z

125

Characterization of Trapped Lignin-Degrading Microbes in Tropical Forest Soil  

E-Print Network [OSTI]

Characterization of Trapped Lignin-Degrading Microbes inCharacterization of Trapped Lignin-Degrading Microbes inCharacterization of Trapped Lignin-Degrading Microbes in

DeAngelis, Kristen

2012-01-01T23:59:59.000Z

126

Exciton self-trapping in bulk polyethylene  

E-Print Network [OSTI]

We studied theoretically the behavior of an injected electron-hole pair in crystalline polyethylene. Time-dependent adiabatic evolution by ab-initio molecular dynamics simulations show that the pair will become self-trapped in the perfect crystal, with a trapping energy of about 0.38 eV, with formation of a pair of trans-gauche conformational defects, three C$_2$H$_4$ units apart on the same chain. The electron is confined in the inter-chain pocket created by a local, 120$^\\circ$ rotation of the chain between the two defects, while the hole resides on the chain and is much less bound. Despite the large energy stored in the trapped excitation, there does not appear to be a direct non-radiative channel for electron-hole recombination. This suggests that intrinsic self-trapping of electron-hole pairs inside the ideal quasi-crystalline fraction of PE might not be directly relevant for electrical damage in high-voltage cables.

D. Ceresoli; M. C. Righi; E. Tosatti; S. Scandolo; G. Santoro; S. Serra

2005-07-13T23:59:59.000Z

127

Quantum Stochastic Heating of a Trapped Ion  

E-Print Network [OSTI]

The resonant heating of a harmonically trapped ion by a standing-wave light field is described as a quantum stochastic process combining a coherent Schroedinger evolution with Bohr-Einstein quantum jumps. Quantum and semi-quantum treatments are compared.

L. Horvath; R. Fisher; M. J. Collett; H. J. Carmichael

2007-11-09T23:59:59.000Z

128

Magneto-Optic Trapping of 210Fr  

Science Journals Connector (OSTI)

The alkali element francium has no stable isotopes and has eluded extensive study because sufficient quantities have not been available for detailed investigations. More than 1000 210Fr atoms have now been contained in a magneto-optic trap. This number is sufficient to allow extensive studies of Fr atomic properties that are necessary input for future tests of fundamental interactions.

J. E. Simsarian; A. Ghosh; G. Gwinner; L. A. Orozco; G. D. Sprouse; P. A. Voytas

1996-05-06T23:59:59.000Z

129

Efficient light-trapping nanostructures in thin silicon solar cells  

E-Print Network [OSTI]

We examine light-trapping in thin crystalline silicon periodic nanostructures for solar cell applications. Using group theory, we show that light-trapping can be improved over a broad band when structural mirror symmetry ...

Han, Sang Eon

130

Carbon dioxide dissolution in structural and stratigraphic traps  

E-Print Network [OSTI]

The geologic sequestration of carbon dioxide (CO[subscript 2]) in structural and stratigraphic traps is a viable option to reduce anthropogenic emissions. While dissolution of the CO[subscript 2] stored in these traps ...

Hesse, M. A.

131

Energy Conservation Thru Steam Trap Surveys and Preventive Maintenance Programs  

E-Print Network [OSTI]

ENERGY CONSERVATION THRU STEAM TRAP SURVEYS AND PREVENTIVE MAINTENANCE PROGRAMS Terry Boynton, Armstrong, Three Rivers, Mich. Bob Dewhirst, Armstrong, New Braunfels, Texas. This paper will deal with steam trap surveys and preventive maintenance...

Boynton, T.; Dewhirst, B.

1980-01-01T23:59:59.000Z

132

Effective Steam Trap Selection/Maintenance - Its Payback  

E-Print Network [OSTI]

In oil refineries and petrochemical plants large number of steam traps are used to discharge condensate from steam mains, tracers and process equipment. Early efforts on steam traps focused almost exclusively on their selection and sizing...

Garcia, E.

1984-01-01T23:59:59.000Z

133

In-Vacuum Active Electronics for Microfabricated Ion Traps  

E-Print Network [OSTI]

The advent of microfabricated ion traps for the quantum information community has allowed research groups to build traps that incorporate an unprecedented number of trapping zones. However, as device complexity has grown, the number of digital-to-analog converter (DAC) channels needed to control these devices has grown as well, with some of the largest trap assemblies now requiring nearly one hundred DAC channels. Providing electrical connections for these channels into a vacuum chamber can be bulky and difficult to scale beyond the current numbers of trap electrodes. This paper reports on the development and testing of an in-vacuum DAC system that uses only 9 vacuum feedthrough connections to control a 78-electrode microfabricated ion trap. The system is characterized by trapping single and multiple $^{40}$Ca$^+$ ions. The measured axial mode stability, ion heating rates, and transport fidelities for a trapped ion are comparable to systems with external(air-side) commercial DACs.

Nicholas D. Guise; Spencer D. Fallek; Harley Hayden; C-S Pai; Curtis Volin; K. R. Brown; J. True Merrill; Alexa W. Harter; Jason M. Amini; Lisa M. Lust; Kelly Muldoon; Doug Carlson; Jerry Budach

2014-06-02T23:59:59.000Z

134

Single microbe trap and release in sub-microfluidics. | EMSL  

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

Single microbe trap and release in sub-microfluidics. Single microbe trap and release in sub-microfluidics. Abstract: Lab-on-a-chip systems have substantially impacted the way...

135

E B UNA-TRAP FISHERY E E ITERRANEAN SEA  

E-Print Network [OSTI]

of the bag of the trap to concentrate the tuna prior to capture. Photo supplied by Dr. Alonzo Palau, Genova

136

Rotating-radio-frequency ion traps T. Hasegawa*  

E-Print Network [OSTI]

rf ion trap, the rotating-radio-frequency rotating-rf trap, in which the motion of a charged particleRotating-radio-frequency ion traps T. Hasegawa* Department of Physics, Keio University, Kanagawa and Technology, Boulder, Colorado 80305, USA Received 9 July 2005; published 20 October 2005 We discuss a radio-frequency

137

Magnetic trapping of metastable 3 P2 atomic strontium  

E-Print Network [OSTI]

Magnetic trapping of metastable 3 P2 atomic strontium S. B. Nagel, C. E. Simien, S. Laha, P. Gupta trapping of metastable 3 P2 atomic strontium. Atoms are cooled in a magneto-optical trap MOT operating cooling on such a transition in strontium may lead to a fast and efficient route to all-optical quantum

Killian, Thomas C.

138

Fundamental limit of nanophotonic light trapping in solar cells  

E-Print Network [OSTI]

Fundamental limit of nanophotonic light trapping in solar cells Zongfu Yu1 , Aaswath Raman and is becoming increasingly urgent for current solar cell research. The standard theory of light trapping) Establishing the fundamental limit of nanophotonic light-trapping schemes is of paramount importance

Fan, Shanhui

139

High voltage gas insulated transmission line with continuous particle trapping  

DOE Patents [OSTI]

This invention provides a novel high voltage gas insulated transmission line utilizing insulating supports spaced at intervals with snap-in means for supporting a continuous trapping apparatus and said trapping apparatus having perforations and cutouts to facilitate trapping of contaminating particles and system flexibility.

Cookson, Alan H. (Pittsburgh, PA); Dale, Steinar J. (Monroeville, PA)

1983-01-01T23:59:59.000Z

140

Trapped-ion antennae for the transmission of quantum information  

Science Journals Connector (OSTI)

... Here this interaction is explored using ions or ion strings held in two separate potential wells of a linear segmented ion trap (Fig. 1 ... segmented ion trap (Fig. 1), where the interacting dipoles are produced by the oscillating charges. As the dipoledipole interaction decreases rapidly with trap separation, it is advantageous ...

M. Harlander; R. Lechner; M. Brownnutt; R. Blatt; W. Hnsel

2011-02-23T23:59:59.000Z

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


141

Energy Savings with Computerized Steam Trap Maintenance Program  

E-Print Network [OSTI]

by Armstrong International, Inc. Five other manufacturers each have about a 5% share of the tmp population, and about 5 more account for the remaining steam traps. 6,430 STEAM TRAPS COLl3Il~) FIGURE 3 - Steam trap population by application. 8,430 STEAM... standardized using the inverted bucket steam trap made by Armstrong International, Inc. "or equal", with approval, wherever applicable and sensible. I believe the inverted bucket steam trap is the best one for this. The selection of a good manufacturer...

Klidzejs, A. M.

142

Steam Trap Testing and Evaluation: An Actual Plant Case Study  

E-Print Network [OSTI]

on there is a hydraul ic shock in the forn! of a water hammer. The standard trap used at the Olin-Joliet Plant is an Armstrong carbon steel inverted bucket. The hydraulic shock has not only broken the valve assembly on the inverted buckets, but has also... service is what caused the traps to fail closed. The last set of traps tested was the Armstrong 1013LV stainless steel inverted buckets. The capacity of these units required that for each coil two traps in parallel would be required. The traps do...

Feldman, A. L.

1981-01-01T23:59:59.000Z

143

An ion trap built with photonic crystal fibre technology  

E-Print Network [OSTI]

We demonstrate a surface-electrode ion trap fabricated using techniques transferred from the manufacture of photonic-crystal fibres. This provides a relatively straightforward route for realizing traps with an electrode structure on the 100 micron scale with high optical access. We demonstrate the basic functionality of the trap by cooling a single ion to the quantum ground state, allowing us to measure a heating rate from the ground state of 787(24) quanta/s. Variation of the fabrication procedure used here may provide access to traps in this geometry with trap scales between 100 um and 10 um.

Lindenfelser, F; Kienzler, D; Bykov, D; Uebel, P; Schmidt, M A; Russell, P St J; Home, J P

2015-01-01T23:59:59.000Z

144

Use of Bullet Traps and Steel Targets  

Broader source: Energy.gov (indexed) [DOE]

USE OF BULLET TRAPS AND USE OF BULLET TRAPS AND STEEL TARGETS U.S. DEPARTMENT OF ENERGY Office of Health, Safety and Security AVAILABLE ONLINE AT: INITIATED BY: http://www.hss.energy.gov Office of Health, Safety and Security Notices This document is intended for the exclusive use of elements of the Department of Energy (DOE), to include the National Nuclear Security Administration, their contractors, and other government agencies/individuals authorized to use DOE facilities. DOE disclaims any and all liability for personal injury or property damage due to use of this document in any context by any organization, group, or individual, other than during official government activities. Local DOE management is responsible for the proper execution of firearms-related programs for

145

Nonperturbative Coherent Population Trapping: An Analytic Model  

Science Journals Connector (OSTI)

Coherent population trapping is shown to occur in a driven symmetric double-well potential in the strong-field regime. The system parameters have been chosen to reproduce the 0-?3+ transition of the inversion mode of the ammonia molecule. For a molecule initially prepared in its lower doublet we find that, under certain circumstances, the 3+ level remains unpopulated, and this occurs in spite of the fact that the laser field is resonant with the 0-?3+ transition and intense enough so as to strongly mix the 0+ and 0- ground states. This counterintuitive result constitutes a coherent population trapping phenomenon of nonperturbative origin which cannot be accounted for with the usual models.

V. Delgado and J. M. Gomez Llorente

2002-01-23T23:59:59.000Z

146

Shortcuts to adiabaticity for trapped ultracold gases  

E-Print Network [OSTI]

We study, experimentally and theoretically, the controlled transfer of harmonically trapped ultracold gases between different quantum states. In particular we experimentally demonstrate a fast decompression and displacement of both a non-interacting gas and an interacting Bose-Einstein condensate which are initially at equilibrium. The decompression parameters are engineered such that the final state is identical to that obtained after a perfectly adiabatic transformation despite the fact that the fast decompression is performed in the strongly non-adiabatic regime. During the transfer the atomic sample goes through strongly out-of-equilibrium states while the external confinement is modified until the system reaches the desired stationary state. The scheme is theoretically based on the invariants of motion and scaling equations techniques and can be generalized to decompression trajectories including an arbitrary deformation of the trap. It is also directly applicable to arbitrary initial non-equilibrium sta...

Schaff, Jean-Franois; Labeyrie, Guillaume; Vignolo, Patrizia

2011-01-01T23:59:59.000Z

147

Shortcuts to adiabaticity for trapped ultracold gases  

E-Print Network [OSTI]

We study, experimentally and theoretically, the controlled transfer of harmonically trapped ultracold gases between different quantum states. In particular we experimentally demonstrate a fast decompression and displacement of both a non-interacting gas and an interacting Bose-Einstein condensate which are initially at equilibrium. The decompression parameters are engineered such that the final state is identical to that obtained after a perfectly adiabatic transformation despite the fact that the fast decompression is performed in the strongly non-adiabatic regime. During the transfer the atomic sample goes through strongly out-of-equilibrium states while the external confinement is modified until the system reaches the desired stationary state. The scheme is theoretically based on the invariants of motion and scaling equations techniques and can be generalized to decompression trajectories including an arbitrary deformation of the trap. It is also directly applicable to arbitrary initial non-equilibrium states.

Jean-Franois Schaff; Pablo Capuzzi; Guillaume Labeyrie; Patrizia Vignolo

2011-05-11T23:59:59.000Z

148

Magneto-Optical Trapping of Holmium Atoms  

E-Print Network [OSTI]

We demonstrate sub-Doppler laser cooling and magneto-optical trapping of the rare earth element Holmium. Atoms are loaded from an atomic beam source and captured in six-beam $\\sigma_+ - \\sigma_-$ molasses using a strong $J=15/2 \\leftrightarrow J=17/2$ cycling transition at $\\lambda=410.5 \\rm nm$. Due to the small difference in hyperfine splittings and Land\\'e $g$-factors in the lower and upper levels of the cooling transition the MOT is self-repumped without additional repump light, and deep sub-Doppler cooling is achieved with the magnetic trap turned on. We measure the leakage out of the cycling transition to metastable states and find a branching ratio $\\sim 10^{-5}$ which is adequate for state resolved measurements on hyperfine encoded qubits.

J. Miao; J. Hostetter; G. Stratis; M. Saffman

2014-03-24T23:59:59.000Z

149

Trapped ghosts: a new class of wormholes  

E-Print Network [OSTI]

We construct examples of static, spherically symmetric wormhole solutions in general relativity with a minimally coupled scalar field $\\phi$ whose kinetic energy is negative in a restricted region of space near the throat (of arbitrary size) and positive far from it. Thus in such configurations a "ghost" is trapped in the strong-field region, which may in principle explain why no ghosts are observed under usual conditions. Some properties of general wormhole models with the $\\phi$ field are revealed: it is shown that (i) trapped-ghost wormholes are only possible with nonzero potentials $V(\\phi)$; (ii) in twice asymptotically flat wormholes, a nontrivial potential $V(\\phi)$ has an alternate sign, and (iii) a twice asymptotically flat wormhole which is mirror-symmetric with respect to its throat has necessarily a zero Schwarzschild mass at both asymptotics.

Kirill A. Bronnikov; Sergey V. Sushkov

2010-01-20T23:59:59.000Z

150

Trapped ghosts: a new class of wormholes  

E-Print Network [OSTI]

We construct examples of static, spherically symmetric wormhole solutions in general relativity with a minimally coupled scalar field $\\phi$ whose kinetic energy is negative in a restricted region of space near the throat (of arbitrary size) and positive far from it. Thus in such configurations a "ghost" is trapped in the strong-field region, which may in principle explain why no ghosts are observed under usual conditions. Some properties of general wormhole models with the $\\phi$ field are revealed: it is shown that (i) trapped-ghost wormholes are only possible with nonzero potentials $V(\\phi)$; (ii) in twice asymptotically flat wormholes, a nontrivial potential $V(\\phi)$ has an alternate sign, and (iii) a twice asymptotically flat wormhole which is mirror-symmetric with respect to its throat has necessarily a zero Schwarzschild mass at both asymptotics.

Bronnikov, Kirill A

2010-01-01T23:59:59.000Z

151

Ion temperature gradient driven turbulence with strong trapped ion resonance  

SciTech Connect (OSTI)

A theory to describe basic characterization of ion temperature gradient driven turbulence with strong trapped ion resonance is presented. The role of trapped ion granulations, clusters of trapped ions correlated by precession resonance, is the focus. Microscopically, the presence of trapped ion granulations leads to a sharp (logarithmic) divergence of two point phase space density correlation at small scales. Macroscopically, trapped ion granulations excite potential fluctuations that do not satisfy dispersion relation and so broaden frequency spectrum. The line width from emission due only to trapped ion granulations is calculated. The result shows that the line width depends on ion free energy and electron dissipation, which implies that non-adiabatic electrons are essential to recover non-trivial dynamics of trapped ion granulations. Relevant testable predictions are summarized.

Kosuga, Y., E-mail: kosuga@riam.kyushu-u.ac.jp [Institute for Advanced Study, Kyushu University, Fukuoka (Japan); Research Institute for Applied Mechanics, Kyushu University, Fukuoka (Japan); Itoh, S.-I. [Research Center for Plasma Turbulence, Kyushu University, Fukuoka (Japan); Research Institute for Applied Mechanics, Kyushu University, Fukuoka (Japan); Diamond, P. H. [CASS and CMTFO, University of California at San Diego, La Jolla, California 92093 (United States); WCI Center for Fusion Theory, National Fusion Research Institute, Daejeon (Korea, Republic of); Itoh, K. [National Institute for Fusion Science, Gifu (Japan); Research Center for Plasma Turbulence, Kyushu University, Fukuoka (Japan); Lesur, M. [Research Institute for Applied Mechanics, Kyushu University, Fukuoka (Japan)

2014-10-15T23:59:59.000Z

152

Pouring flows  

Science Journals Connector (OSTI)

Free surface flows of a liquid poured from a container are calculated numerically for various configurations of the lip. The flow is assumed to be steady two dimensional and irrotational; the liquid is treated as inviscid and incompressible; and gravity is taken into account. It is shown that there are jetlike flows with two free surfaces and other flows with one free surface which follow along the underside of the lip or spout. The latter flows occur in the well?known teapot effect which was treated previously without including gravity. Some of the results are applicable also to flows over weirs and spillways.

Jean?Marc Vanden?Broeck; Joseph B. Keller

1986-01-01T23:59:59.000Z

153

Analysis of Mineral Trapping for CO2 Disposal in Deep Aquifers  

Office of Scientific and Technical Information (OSTI)

Reactive Geochemical Transport Simulation to Study Mineral Trapping Reactive Geochemical Transport Simulation to Study Mineral Trapping for CO 2 Disposal in Deep Saline Arenaceous Aquifers Tianfu Xu, John A. Apps, and Karsten Pruess Earth Sciences Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, CA 94720, USA Abstract. A reactive fluid flow and geochemical transport numerical model for evaluating long-term CO 2 disposal in deep aquifers has been developed. Using this model, we performed a number of sensitivity simulations under CO 2 injection conditions for a commonly encountered Gulf Coast sediment to analyze the impact of CO 2 immobilization through carbonate precipitation. Geochemical models are needed because alteration of the predominant host rock aluminosilicate minerals is very slow and is not

154

Tuning heat transport in trapped-ion chains across a structural phase transition  

Science Journals Connector (OSTI)

We analyze the heat transport in an ion chain that is confined in a strongly anisotropic Paul trap. To drive a heat current across the chain different pairs of counterpropagating laser beams are applied to the ions on the edges. The lasers behave as heat reservoirs operating at different temperatures, and a nonequilibrium heat flow can be sustained. The control of the spatial distribution of the ions in the chain by variation of the trapping frequencies makes ion chains an ideal testbed to study heat transport properties in finite open systems of low dimensionality with tunable nonlinearities. We explore heat transport across a structural phase transition between the linear and zigzag configurations, identifying the condition for optimal heat transport.

A. Ruiz; D. Alonso; M. B. Plenio; A. del Campo

2014-06-13T23:59:59.000Z

155

Pyroclastic flows and lavas of the Mogan and Fataga formations, Tejeda Volcano, Gran Canaria, Canary Islands: mineral chemistry, intensive parameters, and magma chamber evolution  

Science Journals Connector (OSTI)

The Mogan and Fataga formations on the island of Gran Canaria, Canary Islands, represent a sequence of...3 dense-rock equivalent) including subalkaline rhyolitic, peralkaline rhyolitic and trachytic pyroclastic f...

Joy A. Crisp; Frank J. Spera

1987-01-01T23:59:59.000Z

156

A Model For Syn-Eruptive Groundwater Flow During The Phreatoplinian Phase  

Open Energy Info (EERE)

source source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Page Edit History Facebook icon Twitter icon » A Model For Syn-Eruptive Groundwater Flow During The Phreatoplinian Phase Of The 28-29 March 1875 Askja Volcano Eruption, Iceland Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: A Model For Syn-Eruptive Groundwater Flow During The Phreatoplinian Phase Of The 28-29 March 1875 Askja Volcano Eruption, Iceland Details Activities (0) Areas (0) Regions (0) Abstract: We present a groundwater flow model that integrates geological observations, field data, effective permeabilities for fractured lava flows, and historical eyewitness records to explain the change from wet to

157

Isotopic abundance in atom trap trace analysis  

DOE Patents [OSTI]

A method and system for detecting ratios and amounts of isotopes of noble gases. The method and system is constructed to be able to measure noble gas isotopes in water and ice, which helps reveal the geological age of the samples and understand their movements. The method and system uses a combination of a cooled discharge source, a beam collimator, a beam slower and magneto-optic trap with a laser to apply resonance frequency energy to the noble gas to be quenched and detected.

Lu, Zheng-Tian; Hu, Shiu-Ming; Jiang, Wei; Mueller, Peter

2014-03-18T23:59:59.000Z

158

Gas turbine engines with particle traps  

DOE Patents [OSTI]

A gas turbine engine (10) incorporates a particle trap (46) that forms an entrapment region (73) in a plenum (24) which extends from within the combustor (18) to the inlet (32) of a radial-inflow turbine (52, 54). The engine (10) is thereby adapted to entrap particles that originate downstream from the compressor (14) and are otherwise propelled by combustion gas (22) into the turbine (52, 54). Carbonaceous particles that are dislodged from the inner wall (50) of the combustor (18) are incinerated within the entrapment region (73) during operation of the engine (10).

Boyd, Gary L. (Tempe, AZ); Sumner, D. Warren (Phoenix, AZ); Sheoran, Yogendra (Scottsdale, AZ); Judd, Z. Daniel (Phoenix, AZ)

1992-01-01T23:59:59.000Z

159

New nano trap protects environment | Argonne National Laboratory  

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

New nano trap protects environment New nano trap protects environment By Tona Kunz * October 31, 2012 Tweet EmailPrint This story was originally published in volume 10, number 5 of Innovation magazine. A new type of nanoscale molecular trap makes it possible for industry to store large amounts of hydrogen in small fuel cells or capture, compact and remove volatile radioactive gas from spent nuclear fuel in an affordable, easily commercialized way. The ability to adjust the size of the trap openings to select for specific molecules or to alter how molecules are released at industrially accessible pressures makes the trap uniquely versatile. The trap is constructed of commercially available material and made possible through collaborative work at Argonne and Sandia national laboratories. "This introduces a new class of materials to nuclear waste remediation,"

160

Emittance Measurements of Trapped Electrons from a Plasma Wakefield Accelerator  

SciTech Connect (OSTI)

Recent electron beam driven plasma wakefield accelerator experiments carried out at SLAC showed trapping of plasma electrons. These trapped electrons appeared on an energy spectrometer with smaller transverse size than the beam driving the wake. A connection is made between transverse size and emittance; due to the spectrometer's resolution, this connection allows for placing an upper limit on the trapped electron emittance. The upper limit for the lowest normalized emittance measured in the experiment is 1 mm {center_dot} mrad.

Kirby, N.; Berry, M.; Blumenfeld, I.; Decker, F.-J.; Hogan, M.J.; Ischebeck, R.; Iverson, R.; Siemann, R.; Walz, D.; /SLAC; Clayton, C.E.; Huang, C.; Joshi, C.; Lu, W.; Marsh, K.A.; Mori, W.B.; Zhou, M.; /UCLA; Katsouleas, T.C.; Muggli, P.; Oz, E.; /Southern California U.

2007-06-28T23:59:59.000Z

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


161

Decoherence in a single trapped ion due to engineered reservoir  

E-Print Network [OSTI]

The decoherence in trapped ion induced by coupling the ion to the engineered reservoir is studied in this paper. The engineered reservoir is simulated by random variations in the trap frequency, and the trapped ion is treated as a two-level system driven by a far off-resonant plane wave laser field. The dependence of the decoherence rate on the amplitude of the superposition state is given.

X. X. Yi; D. L. Zhou; C. P. Sun

2000-04-18T23:59:59.000Z

162

Gas insulated transmission line having tapered particle trapping ring  

DOE Patents [OSTI]

A gas-insulated transmission line includes an outer sheath, an inner conductor, insulating supports and an insulating gas. A particle-trapping ring is secured to each insulating support, and it is comprised of a central portion and two tapered end portions. The ends of the particle trapping ring have a smaller diameter than the central portion of the ring, so as to enable the use of the particle trapping ring in a curved transmission line.

Cookson, Alan H. (Pittsburgh, PA)

1982-01-01T23:59:59.000Z

163

Fundamental Limit of Nanophotonic Light-Trapping in Solar Cells  

Science Journals Connector (OSTI)

We use a rigorous electromagnetic approach to develop a light-trapping theory, which reveals that the conventional limit 4n2can be substantially surpassed in nanophotonic...

Yu, Zongfu; Raman, Aaswath; Fan, Shanhui

164

Neutron-Mirror-Neutron Oscillations in a Trap  

E-Print Network [OSTI]

We calculate the rate of neutron-mirror-neutron oscillations for ultracold neutrons trapped in a storage vessel. Recent experimental bounds on the oscillation time are discussed.

B. Kerbikov; O. Lychkovskiy

2008-04-03T23:59:59.000Z

165

Neutronmirror-neutron oscillations in a trap  

Science Journals Connector (OSTI)

We calculate the rate of neutronmirror-neutron oscillations for ultracold neutrons trapped in a storage vessel. Recent experimental bounds on the oscillation time are discussed.

B. Kerbikov and O. Lychkovskiy

2008-06-27T23:59:59.000Z

166

Requirements-Driven Diesel Catalyzed Particulate Trap Design...  

Broader source: Energy.gov (indexed) [DOE]

Driven Diesel Catalyzed Particulate Trap (DCPT) Design and Optimization Tom Harris, Donna McConnell and Danan Dou Delphi Catalyst Tulsa, Oklahoma 2 Euro 45 Light Duty...

167

Dielectric nanostructures for broadband light trapping in organic solar cells  

Science Journals Connector (OSTI)

We investigate broadband light trapping using only dielectric components to improve organic solar cell efficiency. We show that substantial absorption and photocurrent enhancement is...

Raman, Aaswath; Yu, Zongfu; Fan, Shanhui

168

Variational calculation of the trapping rate in thermal barriers  

SciTech Connect (OSTI)

A variational calculation of the trapping rate and trapped ion density in thermal barriers is presented. The effects of diffusion in energy as well as pitch angle scattering are retained. The variational formulation uses the actual trapped-passing boundary in velocity space. The boundary condition is that the trapped ion distribution function matches the passing ion distribution function, which is taken to be a Maxwellian, on the boundary. The results compare well with two-dimensional Fokker-Planck code calculations by Futch and LoDestro.

Li, X.Z.; Emmert, G.A.

1982-10-01T23:59:59.000Z

169

Investigation of Aging Mechanisms in Lean NOx Traps | Department...  

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

"Mega" Merit Review 2008 on February 25, 2008 in Bethesda, Maryland. merit08johnson.pdf More Documents & Publications Investigation of Aging Mechanisms in Lean NOx Traps...

170

Location Of Hole And Electron Traps On Nanocrystalline Anatase...  

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

to two overlapping distributions: hole trap emission associated with oxygen vacancies on (101) exposed surfaces, which peaks in the green, and a broader emission...

171

Characterisation of Dust Particles Trapped in Silica Aerogels.  

E-Print Network [OSTI]

?? This thesis involves the study of dust particles trapped in silica aerogel for fusion dust diagnostics purpose. The low velocity impact experiments are done (more)

Liu, Bing

2011-01-01T23:59:59.000Z

172

Flow chamber  

DOE Patents [OSTI]

A flow chamber having a vacuum chamber and a specimen chamber. The specimen chamber may have an opening through which a fluid may be introduced and an opening through which the fluid may exit. The vacuum chamber may have an opening through which contents of the vacuum chamber may be evacuated. A portion of the flow chamber may be flexible, and a vacuum may be used to hold the components of the flow chamber together.

Morozov, Victor (Manassas, VA)

2011-01-18T23:59:59.000Z

173

A Microscale Gas Trapping Investigation Markus Buchgraber, Anthony R. Kovscek  

E-Print Network [OSTI]

A Microscale Gas Trapping Investigation Markus Buchgraber, Anthony R. Kovscek Department of Energy unit Residual Trapping Sgi Sg,max krg krg Sgt(Soi) Sgt,max Gas Saturation Gas relative Land Model * * ** 1 )( gi gi gigt CS S SS + = Sgf Sg Sgt,max kd rg Sg Gas Saturation

Stanford University

174

Biodiversity Conservation and Poverty Traps December 2, 2009  

E-Print Network [OSTI]

Biodiversity Conservation and Poverty Traps December 2, 2009 Co-organizers Alex Travis and Chris biodiversity conservation and poverty traps. Multiple participants observed that Cornell has relatively large. A good deal of discussion concerned the emphasis on biodiversity conservation as opposed to broader

Angenent, Lars T.

175

Trapping of Gun-Injected Plasma by a Tokamak  

Science Journals Connector (OSTI)

It is shown that a plasma produced by a Marshall gun can be injected into and trapped by a tokamak plasma. Gun injection raises the line-averaged density and peaks the density profile. Trapping of the gun-injected plasma is explainable in terms of a depolarization current mechanism.

A. W. Leonard; R. N. Dexter; J. C. Sprott

1986-07-21T23:59:59.000Z

176

Pinch Effect for Trapped Particles in a Tokamak  

Science Journals Connector (OSTI)

Conservation of canonical angular momentum is shown to require that all trapped particles drift towards the magnetic axis with velocity cE?B? (E? is the toroidal electric field; B? the poloidal magnetic field). This property, plus an amplification process for the number of trapped particles, will explain the relaxation oscillations which occur for q3.

A. A. Ware

1970-07-06T23:59:59.000Z

177

Novel Dipole Trapped Spheromak Configuration M. R. Brown,1,  

E-Print Network [OSTI]

Novel Dipole Trapped Spheromak Configuration M. R. Brown,1, * C. D. Cothran,1 J. Fung,1 M. J. Schaffer,2 and E. Belova3 We report the observation and characterization of a spheromak formed in the Swarthmore Spheromak Experiment (SSX) and trapped in a simple dipole magnetic field. The spheromak is studied

Brown, Michael R.

178

Successful Implementation of a Sustainable Trap Management Program.  

E-Print Network [OSTI]

significant cost penalty in delaying implementation of a program to manage the steam trap population. Plants typically embark on a trap management initiative by focusing on a survey, but may not maximize returns because they fail to execute or sustain possible...

Walter, J.

2013-01-01T23:59:59.000Z

179

Steam Traps-The Oft Forgotten Energy Conservation Treasure  

E-Print Network [OSTI]

In these days of high technology, the steam trap is often treated as a commodity item, forgotten by many and respected by a relative few. Yet, in many facilities, widespread undetected failure of steam traps has wasted 5-15% of a plant's total steam...

Pychewicz, F. S.

180

Solar cell efficiency enhancement via light trapping in printable resonant  

E-Print Network [OSTI]

Solar cell efficiency enhancement via light trapping in printable resonant dielectric nanosphere for addressing the key challenge of light trapping in thin-film solar cells. We experimentally and theoretically the absorber, junction, and passivation layers. Recently, a number of innovative solar cell light

Atwater, Harry

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


181

Dielectric nanostructures for broadband light trapping in organic solar cells  

E-Print Network [OSTI]

Dielectric nanostructures for broadband light trapping in organic solar cells Aaswath Raman, Zongfu light trapping configuration for thin-film solar cells," Appl. Phys. Lett. 91, 243501 (2007). 8. M@stanford.edu Abstract: Organic bulk heterojunction solar cells are a promising candidate for low-cost next

Fan, Shanhui

182

Solar cell efficiency enhancement via light trapping in printable resonant  

E-Print Network [OSTI]

Solar cell efficiency enhancement via light trapping in printable resonant dielectric nanosphere for addressing the key challenge of light trapping in thin-film solar cells. We experimentally and theoretically, photovoltaics, resonant dielectric structures, solar cells * Corresponding author: e-mail jgrandid

Grandidier, Jonathan

183

Sympathetic cooling of trapped ions with resonant laser radiation  

SciTech Connect (OSTI)

We propose a novel model to describe dynamic properties of ions that are cooled by collisions with other laser-cooled ions in a quadrupole rf trap. The limit temperature of the sympathetic Cooling is estimated as functions of the trap and laser parameters, and the mass of the ions.

Shimizu, T.; Oshima, Y.; Moriwaki, Y.; Tachikawa, M. [Univ. of Tokyo (Japan)

1994-12-31T23:59:59.000Z

184

ORIGINAL PAPER Flow Dynamics and Plasma Heating of Spheromaks in SSX  

E-Print Network [OSTI]

ORIGINAL PAPER Flow Dynamics and Plasma Heating of Spheromaks in SSX M. R. Brown ? C. D. Cothran ? from single dipole- trapped spheromaks and spheromak merging studies at SSX. Single spheromaks) copper flux conserver. Local spheromak flow is studied with two Mach probes (r1 £ qi, r2 qi) calibrated

Brown, Michael R.

185

Particle-optical self-trapping  

SciTech Connect (OSTI)

The formation of a self-guided beam pattern via optical trapping in a suspension of Rayleigh scatterers is studied. An analytic self-guided solution is presented that is valid for low intensities. A numerical solution of the coupled diffusion and optical-wave equations is presented, which shows an evolution toward a steady state that is independent of the initial optical beam shape. At higher intensities, the numerical solution shows the influence of higher-order nonlinearities, which lead to instability. We define a critical optical intensity, in terms of the particle size, refractive index contrast, and thermal energy, that characterizes the onset of higher-order effects. Instability is found that is consistent with past parametric studies of solitons.

Gordon, R.; Blakely, J. T.; Sinton, D. [Department of Electrical and Computer Engineering, University of Victoria, Victoria, British Columbia, Canada V8P 5C2 (Canada); Department of Mechanical Engineering, University of Victoria, Victoria, British Columbia, Canada V8W 2Y2 (Canada)

2007-05-15T23:59:59.000Z

186

Penning trap mass measurements on nobelium isotopes  

SciTech Connect (OSTI)

The Penning trap mass spectrometer SHIPTRAP at GSI Darmstadt allows accurate mass measurements of radionuclides, produced in fusion-evaporation reactions and separated by the velocity filter SHIP from the primary beam. Recently, the masses of the three nobelium isotopes {sup 252-254}No were determined. These are the first direct mass measurements of transuranium elements, which provide new anchor points in this region. The heavy nuclides were produced in cold-fusion reactions by irradiating a PbS target with a {sup 48}Ca beam, resulting in production rates of the nuclei of interest of about one atom per second. In combination with data from decay spectroscopy our results are used to perform a new atomic-mass evaluation in this region.

Dworschak, M.; Block, M.; Ackermann, D.; Herfurth, F.; Hessberger, F. P.; Hofmann, S.; Vorobyev, G. K. [GSI Helmholtzzentrum fuer Schwerionenforschung, D-64291 Darmstadt (Germany); Audi, G. [CSNSM-IN2P3-CNRS, F-91405 Orsay-Campus (France); Blaum, K. [Max-Planck-Institut fuer Kernphysik, D-69117 Heidelberg (Germany); Ruprecht-Karls-Universitaet, D-69120 Heidelberg (Germany); Droese, C.; Marx, G.; Schweikhard, L. [Ernst-Moritz-Arndt-Universitaet, Institut fuer Physik, D-17487 Greifswald (Germany); Eliseev, S.; Ketter, J. [Max-Planck-Institut fuer Kernphysik, D-69117 Heidelberg (Germany); Fleckenstein, T. [Justus-Liebig-Universitaet Giessen, D-35390 Giessen (Germany); Haettner, E.; Plass, W. R.; Scheidenberger, C. [GSI Helmholtzzentrum fuer Schwerionenforschung, D-64291 Darmstadt (Germany); Justus-Liebig-Universitaet Giessen, D-35390 Giessen (Germany); Ketelaer, J. [Johannes Gutenberg-Universitaet, Institut fuer Physik, D-55099 Mainz (Germany); Kluge, H.-J. [GSI Helmholtzzentrum fuer Schwerionenforschung, D-64291 Darmstadt (Germany); Ruprecht-Karls-Universitaet, D-69120 Heidelberg (Germany)

2010-06-15T23:59:59.000Z

187

Contaminant trap for gas-insulated apparatus  

DOE Patents [OSTI]

A contaminant trap for a gas-insulated electrical conductor is provided. A resinous dielectric body such as Kel-F wax, grease or other sticky polymeric or oligomeric compound is disposed on the inside wall of the outer housing for the conductor. The resinous body is sufficiently sticky at ambient temperatures to immobilize contaminant particles in the insulating gas on the exposed surfaces thereof. An electric resistance heating element is disposed in the resinous body to selectively raise the temperature of the resinous body to a molten state so that the contaminant particles collected on the surface of the body sink into the body so that the surface of the resinous body is renewed to a particle-less condition and, when cooled, returns to a sticky collecting surface.

Adcock, James L. (Knoxville, TN); Pace, Marshall O. (Knoxville, TN); Christophorou, Loucas G. (Oak Ridge, TN)

1984-01-01T23:59:59.000Z

188

Electrostatic particle trap for ion beam sputter deposition  

DOE Patents [OSTI]

A method and apparatus for the interception and trapping of or reflection of charged particulate matter generated in ion beam sputter deposition. The apparatus involves an electrostatic particle trap which generates electrostatic fields in the vicinity of the substrate on which target material is being deposited. The electrostatic particle trap consists of an array of electrode surfaces, each maintained at an electrostatic potential, and with their surfaces parallel or perpendicular to the surface of the substrate. The method involves interception and trapping of or reflection of charged particles achieved by generating electrostatic fields in the vicinity of the substrate, and configuring the fields to force the charged particulate material away from the substrate. The electrostatic charged particle trap enables prevention of charged particles from being deposited on the substrate thereby enabling the deposition of extremely low defect density films, such as required for reflective masks of an extreme ultraviolet lithography (EUVL) system.

Vernon, Stephen P. (Pleasanton, CA); Burkhart, Scott C. (Livermore, CA)

2002-01-01T23:59:59.000Z

189

Ion-trap electrode preparation with Ne$^+$ bombardment  

E-Print Network [OSTI]

We describe an ex-situ surface-cleaning procedure that is shown to reduce motional heating from ion-trap electrodes. This precleaning treatment, to be implemented immediately before the final assembly and vacuum processing of ion traps, removes surface contaminants remaining after the electrode-fabrication process. We incorporate a multi-angle ion-bombardment treatment intended to clean the electrode surfaces and interelectrode gaps of microfabricated traps. This procedure helps to minimize redeposition in the gaps between electrodes that can cause electrical shorts. We report heating rates in a stylus-type ion trap prepared in this way that are lower by one order of magnitude compared to a similar untreated stylus-type trap using the same experimental setup.

McKay, K S; Colombe, Y; Jrdens, R; Wilson, A C; Slichter, D H; Allcock, D T C; Leibfried, D; Wineland, D J; Pappas, D P

2014-01-01T23:59:59.000Z

190

Ion-trap electrode preparation with Ne$^+$ bombardment  

E-Print Network [OSTI]

We describe an ex-situ surface-cleaning procedure that is shown to reduce motional heating from ion-trap electrodes. This precleaning treatment, to be implemented immediately before the final assembly and vacuum processing of ion traps, removes surface contaminants remaining after the electrode-fabrication process. We incorporate a multi-angle ion-bombardment treatment intended to clean the electrode surfaces and interelectrode gaps of microfabricated traps. This procedure helps to minimize redeposition in the gaps between electrodes that can cause electrical shorts. We report heating rates in a stylus-type ion trap prepared in this way that are lower by one order of magnitude compared to a similar untreated stylus-type trap using the same experimental setup.

K. S. McKay; D. A. Hite; Y. Colombe; R. Jrdens; A. C. Wilson; D. H. Slichter; D. T. C. Allcock; D. Leibfried; D. J. Wineland; D. P. Pappas

2014-06-06T23:59:59.000Z

191

Demonstration of a Scalable, Multiplexed Ion Trap for Quantum Information Processing  

E-Print Network [OSTI]

A scalable, multiplexed ion trap for quantum information processing is fabricated and tested. The trap design and fabrication process are optimized for scalability to small trap size and large numbers of interconnected ...

Leibrandt, David R.

192

Measurements of electric field noise and light-induced charging in cryogenic surface electrode ion traps  

E-Print Network [OSTI]

Ion traps provide an excellent tool for controlling and observing the state of a single trapped ion. For this reason, ion traps have been proposed as a possible system for large-scale quantum computation. However, many ...

Lachenmyer, Nathan S. (Nathan Scott)

2010-01-01T23:59:59.000Z

193

Properties of Trapped Electron Bunches in a Plasma Wakefield Accelerator  

SciTech Connect (OSTI)

Plasma-based accelerators use the propagation of a drive bunch through plasma to create large electric fields. Recent plasma wakefield accelerator (PWFA) experiments, carried out at the Stanford Linear Accelerator Center (SLAC), successfully doubled the energy for some of the 42 GeV drive bunch electrons in less than a meter; this feat would have required 3 km in the SLAC linac. This dissertation covers one phenomenon associated with the PWFA, electron trapping. Recently it was shown that PWFAs, operated in the nonlinear bubble regime, can trap electrons that are released by ionization inside the plasma wake and accelerate them to high energies. These trapped electrons occupy and can degrade the accelerating portion of the plasma wake, so it is important to understand their origins and how to remove them. Here, the onset of electron trapping is connected to the drive bunch properties. Additionally, the trapped electron bunches are observed with normalized transverse emittance divided by peak current, {epsilon}{sub N,x}/I{sub t}, below the level of 0.2 {micro}m/kA. A theoretical model of the trapped electron emittance, developed here, indicates that the emittance scales inversely with the square root of the plasma density in the non-linear 'bubble' regime of the PWFA. This model and simulations indicate that the observed values of {epsilon}{sub N,x}/I{sub t} result from multi-GeV trapped electron bunches with emittances of a few {micro}m and multi-kA peak currents. These properties make the trapped electrons a possible particle source for next generation light sources. This dissertation is organized as follows. The first chapter is an overview of the PWFA, which includes a review of the accelerating and focusing fields and a survey of the remaining issues for a plasma-based particle collider. Then, the second chapter examines the physics of electron trapping in the PWFA. The third chapter uses theory and simulations to analyze the properties of the trapped electron bunches. Chapters four and five present the experimental diagnostics and measurements for the trapped electrons. Next, the sixth chapter introduces suggestions for future trapped electron experiments. Then, Chapter seven contains the conclusions. In addition, there is an appendix chapter that covers a topic which is extraneous to electron trapping, but relevant to the PWFA. This chapter explores the feasibility of one idea for the production of a hollow channel plasma, which if produced could solve some of the remaining issues for a plasma-based collider.

Kirby, Neil; /SLAC

2009-10-30T23:59:59.000Z

194

Advanced Light-Trapping in Thin-Film Silicon Solar Cells  

Science Journals Connector (OSTI)

Light-trapping schemes are essential for high efficiency thin-film Silicon devices. Implementation of various light-trapping/scattering elements will be discussed. An optimum textured...

Wyrsch, Nicolas

195

Slug flow  

E-Print Network [OSTI]

Introduction: When two phases flow concurrently in a pipe, they can distribute themselves in a number of different configurations. The gas could be uniformly dispersed throughout the liquid in the form of small bubbles. ...

Griffith, P.

1959-01-01T23:59:59.000Z

196

Energy focusing in bubbly flows  

Science Journals Connector (OSTI)

Sonoluminescence cavitation damage at surfaces and cavitation in accelerating flows are realizations of spectacular levels of energy focusing in nature. In a resonant sound field a single trapped bubble of gas can focus the ambient sound energy by 12 orders of magnitude to generate a clocklike string of picosecond flashes of ultraviolet light. [Barber et al. Defining the unknowns of sonoluminescence Phys. Rep. 281 65 (1977)]. In more complicated geometries a high level of sound leads to the formation of hemispherical bubbles attached to an exposed surface. These bubbles also emit light and in addition damage the surface. Measurements show that the pulsation of these bubbles maintains the hemispherical symmetry [Weninger et al. Sonoluminescence from an isolated bubble on a solid surface Phys. Rev. E 56 6745 (1997)] thus raising the question as to whether cavitation damage is due to (micro)jets or imploding (hemispherical) shock waves. Finally flow through a Venturi tube generates a stream of bubbles which also emit subnanosecond flashes of light [F. B. Peterson and T. P. Anderson Phys. Fluids 10 874 (1967)]. Luminescence from an isolated trapped bubble in water seems to work well with any noble gas whereas luminescence from cavitating flows and surface bubbles is quite dependent on xenon [argon bubbles appear to give no light at all]. The width of the SL flash [Gompf et al. Phys. Rev. Lett. 79 1405 (1997) Hiller et al. Phys. Rev. Lett. 80 1090 (1998)] has been found to be independent of wavelength suggesting that light is emitted from a new high energy phase of matter?probably a cold dense nano?plasma. The key unknowns of SL are the size and temperature of the hot spot from which the light is emitted. Experiments aimed at measuring these quantities will be discussed. [Research supported by the NSF.] a)Present address: CMS Los Alamos National Laboratories Los Alamos NM. b)Present address: Lucent Technologies Murray Hill NJ.

Seth Putterman; Keith Weninger; Robert A. Hiller; Bradley P. Barber

1998-01-01T23:59:59.000Z

197

Using malaise traps to sample ground beetles (Coleoptera: Carabidae).  

SciTech Connect (OSTI)

Pitfall traps provide an easy and inexpensive way to sample ground-dwelling arthropods (Spence and Niemela 1994; Spence et al. 1997; Abildsnes and Tommeras 2000) and have been used exclusively in many studies of the abundance and diversity of ground beetles (Coleoptera: Carabidae). Despite the popularity of this trapping technique, pitfall traps have many disadvantages. For example, they often fail to collect both small (Spence and Niemela 1994) and ?¢????trap-shy?¢??? species (Benest 1989), eventually deplete the local carabid population (Digweed et al. 1995), require a species to be ground-dwelling in order to be captured (Liebherr and Mahar 1979), and produce different results depending on trap diameter and material, type of preservative used, and trap placement (Greenslade 1964; Luff 1975; Work et al. 2002). Further complications arise from seasonal patterns of movement among the beetles themselves (Maelfait and Desender 1990), as well as numerous climatic factors, differences in plant cover, and variable surface conditions (Adis 1979). Because of these limitations, pitfall trap data give an incomplete picture of the carabid community and should be interpreted carefully. Additional methods, such as use of Berlese funnels and litter washing (Spence and Niemela 1994), collection from lights (Usis and MacLean 1998), and deployment of flight intercept devices (Liebherr and Mahar 1979; Paarmann and Stork 1987), should be incorporated in surveys to better ascertain the species composition and relative numbers of ground beetles. Flight intercept devices, like pitfall traps, have the advantage of being easy to use and replicate, but their value to carabid surveys is largely unknown. Here we demonstrate the effectiveness of Malaise traps for sampling ground beetles in a bottomland hardwood forest.

Ulyshen, Michael D., James L. Hanula, and Scott Horn

2005-01-01T23:59:59.000Z

198

Nuclear Fusion for Bose Nuclei Confined in Ion Traps  

SciTech Connect (OSTI)

Nuclear fusion of integer spin nuclei confined in an isotropic ion trap is investigated. Solutions of the ground state for charged bosons trapped in the isotropic harmonic oscillator potential are calculated using the equivalent linear two-body method for many-body problems, which is based on an approximate reduction of the many-body Schroedinger equation by the use of a variational principle. Using the ground-state wave function, theoretical estimates of probabilities and rates for nuclear fusion for Bose nuclei confined in ion traps are obtained. Numerical estimates for fusion rates are presented for the case of deuteron-deuteron fusion.

Kim, Yeong E.; Zubarev, Alexander L. [Purdue University (United States)

2000-03-15T23:59:59.000Z

199

Population trapping in Kr and Xe in intense laser fields  

Science Journals Connector (OSTI)

We have observed trapping of population in Rydberg states of atoms and ions exposed to intense laser radiation. The trapping occurs in nonstationary wave-packet superposition states, created, via ac Stark-shifted multiphoton resonances during the laser pulse. The formation of these highly excited bound states requires the nonresonant absorption of up to 20 or more photons; some of the ionic Rydberg states lie nearly 32 eV above the ionic ground state. All of the trapped states having binding energies much less than the photon energy but remain stable against ionization even when the multiphoton ionization probability of the atom is saturated.

R. R. Jones; D. W. Schumacher; P. H. Bucksbaum

1993-01-01T23:59:59.000Z

200

Laser trapping of short-lived radioactive isotopes  

Science Journals Connector (OSTI)

We describe an experiment which demonstrates the feasibility of trapping significant quantities of short-lived radioactive atoms with laser light. A thermal beam of 22.5 sec half-life Na21 atoms was produced on-line at the LBL 88 Cyclotron. After decelerating the beam using a Zeeman-tuned slowing technique we stored about 4103 Na21 atoms in a magneto-optical trap. The number of trapped atoms is large enough to be used in experimental studies of the beta decay of Na21. The basic method can be adapted for other rare isotopes.

Z-T. Lu; C. Bowers; S. J. Freedman; B. K. Fujikawa; J. L. Mortara; S-Q. Shang; K. P. Coulter; L. Young

1994-06-13T23:59:59.000Z

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


201

Trap seal for open circuit liquid cooled turbines  

DOE Patents [OSTI]

An improved trap seal for open circuit liquid cooled turbines is disclosed. The trap seal of the present invention includes an annular recess formed in the supply conduit of cooling channels formed in the airfoil of the turbine buckets. A cylindrical insert is located in the annular recesses and has a plurality of axial grooves formed along the outer periphery thereof and a central recess formed in one end thereof. The axial grooves and central recess formed in the cylindrical insert cooperate with the annular recess to define a plurality of S-shaped trap seals which permit the passage of liquid coolant but prohibit passage of gaseous coolant.

Grondahl, Clayton M. (Clifton Park, NY); Germain, Malcolm R. (Ballston Lake, NY)

1980-01-01T23:59:59.000Z

202

Purple traps yield Reservation's first detection of Emerald Ash Borer  

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

traps yield Reservation's first detection of Emerald Ash Borer traps yield Reservation's first detection of Emerald Ash Borer The question of whether or not DOE's forests are infested with Emerald Ash Borer (EAB) has been answered. On May 10, a trap on Highway 95 at the Highway 58 interchange produced the first instance of the destructive non-native insect in Roane County. Five days later, a second trap on Bethel Valley Road near the East Portal turned up the first capture in Anderson County. "Unfortunately, these finds signal the beginning of a decline of ash species throughout the reservation" according to Greg Byrd, forester with the ORNL Natural Resources Program. "Dieback will become more prominent as the insect populations expand. Native ash trees have little defense against this pest, which was

203

Laser ablation loading of a surface-electrode ion trap  

E-Print Network [OSTI]

We demonstrate loading by laser ablation of $^{88}$Sr$^+$ ions into a mm-scale surface-electrode ion trap. The laser used for ablation is a pulsed, frequency-tripled Nd:YAG with pulse energies of 1-10 mJ and durations of 3-5 ns. An additional laser is not required to photoionize the ablated material. The efficiency and lifetime of several candidate materials for the laser ablation target are characterized by measuring the trapped ion fluorescence signal for a number of consecutive loads. Additionally, laser ablation is used to load traps with a trap depth (40 meV) below where electron impact ionization loading is typically successful ($\\gtrsim$ 500 meV).

David R. Leibrandt; Robert J. Clark; Jaroslaw Labaziewicz; Paul Antohi; Waseem Bakr; Kenneth R. Brown; Isaac L. Chuang

2007-06-22T23:59:59.000Z

204

Coherent control of a qubit is trap-free  

E-Print Network [OSTI]

There is a strong interest in optimal manipulating of quantum systems by external controls. Traps are controls which are optimal only locally but not globally. If they exist, they can be serious obstacles to the search of globally optimal controls in numerical and laboratory experiments, and for this reason the analysis of traps attracts considerable attention. In this paper we prove that for a wide range of control problems for two-level quantum systems all locally optimal controls are also globally optimal. Hence we conclude that two-level systems in general are trap-free. In particular, manipulating qubits---two-level quantum systems forming a basic building block for quantum computation---is free of traps for fundamental problems such as the state preparation and gate generation.

Alexander Pechen; Nikolay Il'in

2014-07-19T23:59:59.000Z

205

Electron source for a mini ion trap mass spectrometer  

DOE Patents [OSTI]

An ion trap is described which operates in the regime between research ion traps which can detect ions with a mass resolution of better than 1:10{sup 9} and commercial mass spectrometers requiring 10{sup 4} ions with resolutions of a few hundred. The power consumption is kept to a minimum by the use of permanent magnets and a novel electron gun design. By Fourier analyzing the ion cyclotron resonance signals induced in the trap electrodes, a complete mass spectra in a single combined structure can be detected. An attribute of the ion trap mass spectrometer is that overall system size is drastically reduced due to combining a unique electron source and mass analyzer/detector in a single device. This enables portable low power mass spectrometers for the detection of environmental pollutants or illicit substances, as well as sensors for on board diagnostics to monitor engine performance or for active feedback in any process involving exhausting waste products. 10 figs.

Dietrich, D.D.; Keville, R.F.

1995-12-19T23:59:59.000Z

206

Electron source for a mini ion trap mass spectrometer  

DOE Patents [OSTI]

An ion trap which operates in the regime between research ion traps which can detect ions with a mass resolution of better than 1:10.sup.9 and commercial mass spectrometers requiring 10.sup.4 ions with resolutions of a few hundred. The power consumption is kept to a minimum by the use of permanent magnets and a novel electron gun design. By Fourier analyzing the ion cyclotron resonance signals induced in the trap electrodes, a complete mass spectra in a single combined structure can be detected. An attribute of the ion trap mass spectrometer is that overall system size is drastically reduced due to combining a unique electron source and mass analyzer/detector in a single device. This enables portable low power mass spectrometers for the detection of environmental pollutants or illicit substances, as well as sensors for on board diagnostics to monitor engine performance or for active feedback in any process involving exhausting waste products.

Dietrich, Daniel D. (Livermore, CA); Keville, Robert F. (Valley Springs, CA)

1995-01-01T23:59:59.000Z

207

Neutron lifetime measurements using gravitationally trapped ultracold neutrons  

E-Print Network [OSTI]

Our experiment using gravitationally trapped ultracold neutrons (UCN) to measure the neutron lifetime is reviewed. Ultracold neutrons were trapped in a material bottle covered with perfluoropolyether. The neutron lifetime was deduced from comparison of UCN losses in the traps with different surface-to-volume ratios. The precise value of the neutron lifetime is of fundamental importance to particle physics and cosmology. In this experiment, the UCN storage time is brought closer to the neutron lifetime than in any experiments before:the probability of UCN losses from the trap was only 1% of that for neutron beta decay. The neutron lifetime obtained,878.5+/-0.7stat+/-0.3sys s, is the most accurate experimental measurement to date.

A. P. Serebrov; V. E. Varlamov; A. G. Kharitonov; A. K. Fomin; Yu. N. Pokotilovski; P. Geltenbort; I. A. Krasnoschekova; M. S. Lasakov; R. R. Taldaev; A. V. Vassiljev; O. M. Zherebtsov

2007-02-06T23:59:59.000Z

208

Neutron lifetime measurements using gravitationally trapped ultracold neutrons  

SciTech Connect (OSTI)

Our experiment using gravitationally trapped ultracold neutrons (UCN) to measure the neutron lifetime is reviewed. Ultracold neutrons were trapped in a material bottle covered with perfluoropolyether. The neutron lifetime was deduced from comparison of UCN losses in the traps with different surface-to-volume ratios. The precise value of the neutron lifetime is of fundamental importance to particle physics and cosmology. In this experiment, the UCN storage time is brought closer to the neutron lifetime than in any experiments before: the probability of UCN losses from the trap was only 1% of that for neutron {beta} decay. The neutron lifetime obtained, 878.5{+-}0.7{sub stat}{+-}0.3{sub sys} s, is the most accurate experimental measurement to date.

Serebrov, A. P.; Varlamov, V. E.; Kharitonov, A. G.; Fomin, A. K.; Krasnoschekova, I. A.; Lasakov, M. S.; Taldaev, R. R.; Vassiljev, A. V.; Zherebtsov, O. M. [Petersburg Nuclear Physics Institute, Russian Academy of Sciences, RU-188300 Gatchina, Leningrad District (Russian Federation); Pokotilovski, Yu. N. [Joint Institute for Nuclear Research, RU-141980 Dubna, Moscow Region (Russian Federation); Geltenbort, P. [Institut Max von Laue Paul Langevin, Boite Postal 156, F-38042 Grenoble Cedex 9 (France)

2008-09-15T23:59:59.000Z

209

A bosonic Josephson junction controlled by a single trapped ion  

E-Print Network [OSTI]

We theoretically investigate the properties of a double-well bosonic Josephson junction coupled to a single trapped ion. We find that the coupling between the wells can be controlled by the internal state of the ion, which can be used for studying mesoscopic entanglement between the two systems and to measure their interaction with high precision. As a particular example we consider a small $^{87}$Rb Bose-Einstein condensate controlled by a single $^{171}$Yb$^+$ ion. We calculate interwell coupling rates reaching 100 Hz, while the state dependence amounts to 10s of Hz for plausible values of the currently unknown s-wave scattering length between the atom and the ion. The system could be realized in an experiment by combining trapped ions with optical dipole traps for cold atoms or in a combined atom-ion micro trap, where both approaches are within reach using current technology.

Gerritsma, R; Doerk, H; Idziaszek, Z; Calarco, T; Schmidt-Kaler, F

2011-01-01T23:59:59.000Z

210

Mass Spectrometer: Linear Ion Trap Quadrupole (LTQ) Orbitrap...  

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

Ion Trap Quadrupole (LTQ) Orbitrap MS - for environmental research (nanoDESI) Instrument ID: 34068 Availability: 10 hours a day, 5 days a week Quick Specs Science Contact Science...

211

Quantum gates, sensors, and systems with trapped ions  

E-Print Network [OSTI]

Quantum information science promises a host of new and useful applications in communication, simulation, and computational algorithms. Trapped atomic ions are one of the leading physical systems with potential to implement ...

Wang, Shannon Xuanyue

2012-01-01T23:59:59.000Z

212

Pt-free, Perovskite-based Lean NOx Trap Catalysts  

Broader source: Energy.gov (indexed) [DOE]

Conference Pt-free, Perovskite-based Lean NO x Trap Catalysts Gongshin Qi, Chang H. Kim, and Wei Li GM Global Research & Development 2010 DEER Conference Overview LNT Chemistry...

213

On the generation of bottom-trapped internal tides  

Science Journals Connector (OSTI)

The interaction of the barotropic tide with the bottom topography when the tidal frequency ? is smaller than the Coriolis frequency f is examined. The resulting waves are called bottom-trapped internal tides. The energy density associated with ...

Saeed Falahat; Jonas Nycander

214

A variational calculation of the trapping rate in thermal barriers  

Science Journals Connector (OSTI)

A variational calculation of the trapping rate and trapped-ion density in thermal barriers is presented. The effects of diffusion in energy as well as pitch-angle scattering are retained. The variational formulation uses the actual trapped/passing boundary in velocity space. The boundary condition is that the trapped-ion distribution function match the passing-ion distribution function, which is taken to be a Maxwellian, on the boundary. The results compare well with the two-dimensional Fokker-Planck code calculations by Futch and LoDestro. The CPU time for a variational calculation is less than 0.1 s using the CRAY-I computer, while a typical Fokker-Planck code calculation takes 1020 min.

X.Z. Li; G.A. Emmert

1984-01-01T23:59:59.000Z

215

Brief Communication 1195 A gene trap approach in Xenopus  

E-Print Network [OSTI]

developed several gene trap vectors, using the green fluorescent protein (GFP) as a marker. Using, including expression in the epiphysis, the olfactory bulb and placodes, the eyes, ear, brain, muscles, tail

Amaya, Enrique

216

Quantum state engineering in ion-traps via adiabatic passage  

Science Journals Connector (OSTI)

We propose two relatively robust schemes to generate entangled W states of three (or generally N) ions in ion trap systems by using adiabatic passage technique and appropriately designed ion-field couplings in a ...

M. Amniat-Talab; M. Saadati-Niari; S. Gurin

2012-08-01T23:59:59.000Z

217

Light trapping limits in plasmonic solar cells: an analytical investigation  

E-Print Network [OSTI]

We analytically investigate the light trapping performance in plasmonic solar cells with Si/metallic structures. We consider absorption enhancements for surface plasmon polaritons (SPPs) at planar Si/metal interfaces and ...

Sheng, Xing

218

Wednesday, January 30, 2013 Infrared Trapping the "Greenhouse Effect"  

E-Print Network [OSTI]

Wednesday, January 30, 2013 Infrared Trapping ­ the "Greenhouse Effect" Goals ­ to look is the same as a 1.8 degree F change. #12;Last time - Greenhouse effect demo Selective absorption. Greenhouse

Toohey, Darin W.

219

Novel trapping techniques for shaping Bose-Einstein condensates  

E-Print Network [OSTI]

A combination of radio frequency radiation and magnetic field gradients was used to trap atoms in dressed states. In a magnetic field with a quadrupole minimum. RF fields resonant with the (I F. m)) 11. -1) -- 1, 0) ...

Boyd, Micah (Micah Scott)

2007-01-01T23:59:59.000Z

220

Light Trapping, Absorption and Solar Energy Harvesting by Artificial Materials  

SciTech Connect (OSTI)

We provide designs of thin-film solar cells utilizing optimized photonic-crystal light-trapping and numerical simulations of their solar-to-electrical power conversion efficiencies.

John, Sajeev [University of Toronto

2014-08-15T23:59:59.000Z

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


221

Combined U-Th/He and 40Ar/39Ar geochronology of post-shield lavas from the Mauna Kea and Kohala volcanoes, Hawaii  

SciTech Connect (OSTI)

Late Quaternary, post-shield lavas from the Mauna Kea and Kohala volcanoes on the Big Island of Hawaii have been dated using the {sup 40}Ar/{sup 39}Ar and U-Th/He methods. The objective of the study is to compare the recently demonstrated U-Th/He age method, which uses basaltic olivine phenocrysts, with {sup 40}Ar/{sup 39}Ar ages measured on groundmass from the same samples. As a corollary, the age data also increase the precision of the chronology of volcanism on the Big Island. For the U-Th/He ages, U, Th and He concentrations and isotopes were measured to account for U-series disequilibrium and initial He. Single analyses U-Th/He ages for Hamakua lavas from Mauna Kea are 87 {+-} 40 ka to 119 {+-} 23 ka (2{sigma} uncertainties), which are in general equal to or younger than {sup 40}Ar/{sup 39}Ar ages. Basalt from the Polulu sequence on Kohala gives a U-Th/He age of 354 {+-} 54 ka and a {sup 40}Ar/{sup 39}Ar age of 450 {+-} 40 ka. All of the U-Th/He ages, and all but one spurious {sup 40}Ar/{sup 39}Ar ages conform to the previously proposed stratigraphy and published {sup 14}C and K-Ar ages. The ages also compare favorably to U-Th whole rock-olivine ages calculated from {sup 238}U - {sup 230}Th disequilibria. The U-Th/He and {sup 40}Ar/{sup 39}Ar results agree best where there is a relatively large amount of radiogenic {sup 40}Ar (>10%), and where the {sup 40}Ar/{sup 36}Ar intercept calculated from the Ar isochron diagram is close to the atmospheric value. In two cases, it is not clear why U-Th/He and {sup 40}Ar/{sup 39}Ar ages do not agree within uncertainty. U-Th/He and {sup 40}Ar/{sup 39}Ar results diverge the most on a low-K transitional tholeiitic basalt with abundant olivine. For the most alkalic basalts with negligible olivine phenocrysts, U-Th/He ages were unattainable while {sup 40}Ar/{sup 39}Ar results provide good precision even on ages as low as 19 {+-} 4 ka. Hence, the strengths and weaknesses of the U-Th/He and {sup 40}Ar/{sup 39}Ar methods are complimentary for basalts with ages of order 100-500 ka.

Aciego, S.M.; Jourdan, F.; DePaolo, D.J.; Kennedy, B.M.; Renne, P.R.; Sims, K.W.W.

2009-10-01T23:59:59.000Z

222

Laser induced rotation of trapped chiral and achiral nematic droplets  

E-Print Network [OSTI]

We study the response of optically trapped achiral and chiralised nematic liquid crystal droplets to linear as well as circular polarised light. We find that there is internal dissipation in rotating achiral nematic droplets trapped in glycerine. We also demonstrate that some chiralised droplets rotate under linearly polarised light. The best fit to our data on chiralised droplets indicates that rotational frequency of these droplets with radius R is approximately proportional to1/R^2, rather than to 1/R^3.

Marjan Mosallaeipour; Yashodhan Hatwalne; N. V. Madhusudana; Sharath Ananthamurthy

2010-02-05T23:59:59.000Z

223

Trapped surfaces in Oppenheimer-Snyder black holes  

E-Print Network [OSTI]

The Oppenheimer-Snyder solution models a homogeneous round dust cloud collapsing to a black hole. Inside its event horizon there is a region through which trapped surfaces pass. We try to determine exactly where the boundary of this region meets the centre of the cloud. We present explicit examples of the relevant trapped (topological) spheres; they extend into the exterior vacuum region, and are carefully matched at the junction between the cloud and the vacuum.

Ingemar Bengtsson; Emma Jakobsson; Jos M. M. Senovilla

2013-06-27T23:59:59.000Z

224

The Engineered Approach to Energy and Maintenance Effective Steam Trapping  

E-Print Network [OSTI]

., Chemical Engineering 9/1/75. 4. Maintenance Engineering, May 1976. 5. "How Much Does Lost Steam Cost",Armstrong Machine works, Hydrocarbon Processing, p.129, Jan. 1976. 6. "Setter Steam Trapping Cuts Energy Waste", wesley Yates, Yarway Corp..., Georgia Tech Industrial Energy Extension Service, Chemical Engineering, 2/11/80. 10. ''Basic Facts & Enerqv Saving Tips" ,Lawrence R. O'Dell, Armstrong Machine Works, Heating/Piping/ Air Conditioning, May 1977. 11. Steam Trap Report - Energy Loss...

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

1980-01-01T23:59:59.000Z

225

Master equation approach to protein folding and kinetic traps  

E-Print Network [OSTI]

The master equation for 12-monomer lattice heteropolymers is solved numerically and the time evolution of the occupancy of the native state is determined. At low temperatures, the median folding time follows the Arrhenius law and is governed by the longest relaxation time. For good folders, significant kinetic traps appear in the folding funnel whereas for bad folders, the traps also occur in non-native energy valleys.

Marek Cieplak; Malte Henkel; Jan Karbowski; Jayanth R. Banavar

1998-04-21T23:59:59.000Z

226

Design and operation of the electron beam ion trap  

SciTech Connect (OSTI)

This report describes the basic features and operating principles of the Electron Beam Ion Trap. The differences between EBIT and other sources of highly charged ions are outlined. Its features and operating parameters are discussed. The report also explains why certain design choices were necessary and the constraints involved in building an electron beam ion trap. EBIT's evaporation cooling system is described in detail. 13 refs., 8 figs.

Vogel, D.

1990-05-30T23:59:59.000Z

227

Magnetic line trapping and effective transport in stochastic magnetic fields  

Science Journals Connector (OSTI)

The transport of collisional particles in stochastic magnetic fields is studied using the decorrelation trajectory method. The nonlinear effect of magnetic line trapping is considered together with particle collisions. The running diffusion coefficient is determined for arbitrary values of the statistical parameters of the stochastic magnetic field and of the collisional velocity. The effect of the magnetic line trapping is determined. New anomalous diffusion regimes are found.

M. Vlad; F. Spineanu; J. H. Misguich; R. Balescu

2003-02-07T23:59:59.000Z

228

Measuring the Neutron Lifetime Using Magnetically Trapped Neutrons  

E-Print Network [OSTI]

The neutron beta-decay lifetime plays an important role both in understanding weak interactions within the framework of the Standard Model and in theoretical predictions of the primordial abundance of 4He in Big Bang Nucleosynthesis. In previous work, we successfully demonstrated the trapping of ultracold neutrons (UCN) in a conservative potential magnetic trap. A major upgrade of the apparatus is nearing completion at the National Institute of Standards and Technology Center for Neutron Research (NCNR). In our approach, a beam of 0.89 nm neutrons is incident on a superfluid 4He target within the minimum field region of an Ioffe-type magnetic trap. A fraction of the neutrons is downscattered in the helium to energies <200 neV, and those in the appropriate spin state become trapped. The inverse process is suppressed by the low phonon density of helium at temperatures less than 200 mK, allowing the neutron to travel undisturbed. When the neutron decays the energetic electron ionizes the helium, producing scintillation light that is detected using photomultiplier tubes. Statistical limitations of the previous apparatus will be alleviated by significant increases in field strength and trap volume resulting in twenty times more trapped neutrons.

C. M. O'Shaughnessy; R. Golub; K. W. Schelhammer; C. M. Swank; P. -N. Seo; P. R. Huffman; S. N. Dzhosyuk; C. E. H. Mattoni; L. Yang; J. M. Doyle; K. J. Coakley; A. K. Thompson; H. P. Mumm; S. K. Lamoreaux; G. Yang

2009-03-31T23:59:59.000Z

229

System and method for trapping and measuring a charged particle in a liquid  

DOE Patents [OSTI]

A system and method for trapping a charged particle is disclosed. A time-varying periodic multipole electric potential is generated in a trapping volume. A charged particle under the influence of the multipole electric field is confined to the trapping volume. A three electrode configuration giving rise to a 3D Paul trap and a four planar electrode configuration giving rise to a 2D Paul trap are disclosed.

Reed, Mark A; Krstic, Predrag S; Guan, Weihua; Zhao, Xiongce

2013-07-23T23:59:59.000Z

230

Page not found | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

61 - 16170 of 26,764 results. 61 - 16170 of 26,764 results. Article Ancient Lava Flows Trap CO2 for Long-Term Storage in Big Sky Injection How can a prehistoric volcanic eruption help us reduce the amount of CO2 released into the atmosphere today? The answer is found in the basalt formations created by the lava - formations that can be used as sites for injecting carbon dioxide (CO2) captured from industrial sources in a process called carbon capture and storage. The Big Sky Carbon Sequestration Partnership recently injected 1,000 metric tons of CO2 into the Grande Ronde Basalt Formation in eastern Washington. This first-of-its kind injection is part of research meant to determine if basalt formations could provide a long-term solution for storing CO2, a potent greenhouse gas. http://energy.gov/fe/articles/ancient-lava-flows-trap-co2-long-term-storage-big-sky-injection

231

Exploration for stratigraphic traps in a mature hydrodynamic setting, Williston Basin, North Dakota  

SciTech Connect (OSTI)

Hydrodynamic effects on oil accumulations generally can be recognized at an early stage of exploration, but become of critical importance with increased drilling and discoveries. At the mature stage, hydrodynamic concepts readily can be applied in exploration and development to reduce risk and to increase success ratios. The south flank of the Williston basin is an example of a mature area with significant hydrodynamic effects on accumulation. Early exploration was aimed at stratigraphic traps in the Mission Canyon Formation but the development of major fields showed that all are strongly influenced by hydrodynamic flow and some may be largely independent of porosity pinchouts. Examples of hydrodynamic effects are illustrated by the Billings Nose fields, and the Elkhorn Ranch and Knutson fields. These accumulations have hydrodynamic gradients on the order of 20 ft/mi (4 m/km) or more; tilted oil-water contacts with gradient of 30 to 50 ft/mi (6 to 10 m/km); displacement of oil downdip to the northeast; and variable formation water salinities that range from nearly fresh to highly saline. Some producing zones have been described as purely hydrodynamic traps, lacking both structural and stratigraphic closure. Future success will depend on applying hydrodynamic concepts in exploration and development, and prediction methods are illustrated by possible extensions to existing one-well fields. Simple graphic techniques can estimate the limits of production before drilling, but a knowledge of local structure is most important to the interpretation.

Berg, R.R. (Texas A and M Univ., College Station (USA))

1990-05-01T23:59:59.000Z

232

SFTEL: Flow Cell | EMSL  

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

Flow Cell EMSL's Subsurface Flow and Transport Experimental Laboratory offers several meter-scale flow cells and columns for research in saturated and unsaturated porous media....

233

`Quantum explosion' of a trapped one-dimensional Bose gas  

E-Print Network [OSTI]

We analyze free expansion of a trapped one-dimensional Bose gas after a sudden release from the confining trap potential. By using the stationary phase and local density approximations, we show that the long-time asymptotic density profile and the momentum distribution of the gas are determined by the initial distribution of Bethe rapidities (quasimomenta) and hence can be obtained from the solutions to the thermodynamic Bethe ansatz equations. For expansion from a harmonic trap, and in the limits of very weak and very strong interactions, we recover the known scaling solutions of the hydrodynamic approach corresponding to self-similar expansion. For all other power-law traps and arbitrary interaction strengths, the expansion is not self-similar and shows strong dependence on the trap anharmonicity of the shape variation of the density profile during evolution. We also characterize dynamical fermionization of an expanding cloud in terms of its first- and second-order coherences describing phase and density fluctuations.

A. S. Campbell; D. M. Gangardt; K. V. Kheruntsyan

2015-01-15T23:59:59.000Z

234

EXPERIMENTAL STUDY OF ION INJECTION INTO AN EXTENDED TRAP OF THE BNL EBIS.  

SciTech Connect (OSTI)

Experiments on the BNL EBIS Test Stand (EBTS) with the ion trap extending beyond the edges of the superconducting solenoid had the main goal to study ion trap operation with a trap length exceeding that of the normal EBTS trap. Preliminary results indicate that the ion trap with length 107 cm is stable and controllable in the same fashion as our normal 70 cm trap with a multiampere electron beam. EBTS operation with ion trap 145 cm long and with electron current up to 3 A in earlier experiments also was stable and yielded more ions than from the basic ''short'' trap. These results increased our confidence in operation of the proposed RHIC in a stable mode and in the correctness of linear scaling of ion intensity with the length of the ion trap.

PIKIN,A.; ALESSI,J.; BEEBE,E.; KPONOU,A.; PRELEC,K.

2001-09-02T23:59:59.000Z

235

Coulomb crystal mass spectrometry in a digital ion trap  

E-Print Network [OSTI]

We present a mass spectrometric technique for identifying the masses and relative abundances of Coulomb-crystallized ions held in a linear Paul trap. A digital radiofrequency waveform is employed to generate the trapping potential, as this can be cleanly switched off, and static dipolar fields subsequently applied to the trap electrodes for ion ejection. Excellent detection efficiency is demonstrated for Ca+ and CaF+ ions from bi-component Ca+/CaF+ Coulomb crystals prepared by reaction of Ca+ with CH3F. A quantitative linear relationship is observed between ion number and the corresponding integrated TOF peak, independent of the ionic species. The technique is applicable to a diverse range of multi-component Coulomb crystals - demonstrated here for Ca+/NH3+/NH4+ and Ca+/CaOH+/CaOD+ crystals - and will facilitate the measurement of ion-molecule reaction rates and branching ratios in complicated reaction systems.

Deb, Nabanita; Smith, Alexander D; Keller, Matthias; Rennick, Christopher J; Heazlewood, Brianna R; Softley, Timothy P

2015-01-01T23:59:59.000Z

236

"Magic" radio-frequency dressing for trapped atomic microwave clocks  

E-Print Network [OSTI]

It has been proposed to use magnetically trapped atomic ensembles to enhance the interrogation time in microwave clocks. To mitigate the perturbing effects of the magnetic trap, "near-magic field" configurations are employed, where the involved clock transition becomes independent of the atoms potential energy to first order. Still, higher order effects are a dominating source for dephasing, limiting the perfomance of this approach. Here we propose a simple method to cancel the energy dependence to both, first and second order, using weak radio-frequency dressing. We give values for dressing frequencies, amplitudes, and trapping fields for 87Rb atoms and investigate quantitatively the robustness of these "second-order magic" conditions to variations of the system parameters. We conclude that radio-frequency dressing can suppress field-induced dephasing by at least one order of magnitude for typical experimental parameters.

Kazakov, Georgy A

2014-01-01T23:59:59.000Z

237

Trapped-flux internal-dipole superconducting motor/generator.  

SciTech Connect (OSTI)

A new class of motor/generator (M/G) utilizes the magnetic flux trapping capability of high-temperature superconductors (HTSs). The rotor, consists of a cylindrical shell composed of HTS segments. These segments act as trapped-field magnets, magnetized in such a way that a dipole magnetic field is produced in the interior of the shell. A stator coil assembly is placed in the interior of the shell and current passing through the conductors of the coil produce a rotational torque, either as a hysteresis motor or as a synchronous motor. The coil may be either conventional, with copper wires and an iron core, or composed of superconductors and can be used to establish the trapped fields in the HTSs.

Hull, J. R.

1998-09-03T23:59:59.000Z

238

Trapped Ion Chain Thermometry and Mass Analysis Through Imaging  

E-Print Network [OSTI]

We demonstrate the temperature measurement of individual laser cooled ions in a linear Coulomb crystal by relating their imaged spatial extent along the linear Paul trap axis to the normal modes of vibration of coupled oscillators in a harmonic potential. We also use the thermal spatial spread of `bright' ions in the case of a two-species mixed chain to measure the secular resonance frequency of vibration of the center-of-mass mode of the entire chain and infer the molecular composition of the co-trapped `dark' ions. These techniques create new possibilities for better understanding of sympathetic cooling in mixed-ion chains and under conditions of non-uniform heat load, improving few-ion mass spectrometry, and making in-situ temperature measurements of individual trapped ions without requiring a scan over the Doppler cooling parameters.

V. Rajagopal; J. P. Marler; M. G. Kokish; B. C. Odom

2014-08-06T23:59:59.000Z

239

Trapped Ion Chain Thermometry and Mass Analysis Through Imaging  

E-Print Network [OSTI]

We demonstrate the temperature measurement of individual laser cooled ions in a linear Coulomb crystal by relating their imaged spatial extent along the linear Paul trap axis to the normal modes of vibration of coupled oscillators in a harmonic potential. We also use the thermal spatial spread of `bright' ions in the case of a two-species mixed chain to measure the secular resonance frequency of vibration of the center-of-mass mode of the entire chain and infer the molecular composition of the co-trapped `dark' ions. These techniques create new possibilities for better understanding of sympathetic cooling in mixed-ion chains and under conditions of non-uniform heat load, improving few-ion mass spectrometry, and making in-situ temperature measurements of individual trapped ions without requiring a scan over the Doppler cooling parameters.

Rajagopal, V; Kokish, M G; Odom, B C

2014-01-01T23:59:59.000Z

240

Single Ion Trapping For The Enriched Xenon Observatory  

E-Print Network [OSTI]

In the last decade, a variety of neutrino oscillation experiments have established that there is a mass difference between neutrino flavors, without determining the absolute neutrino mass scale. The Enriched Xenon Observatory for neutrinoless double beta decay (EXO) will search for the rare decays of xenon to determine the absolute value of the neutrino mass. The experiment uses a novel technique to minimize backgrounds, identifying the decay daughter product in real time using single ion spectroscopy. Here, we describe single ion trapping and spectroscopy compatible with the EXO detector. We extend the technique of single ion trapping in ultrahigh vacuum to trapping in xenon gas. With this technique, EXO will achieve a neutrino mass sensitivity of ? m?? ≃ .010 eV.

Waldman, S J

2005-01-01T23:59:59.000Z

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


241

Electron capture by trapped Neq+ ions at very low energies  

Science Journals Connector (OSTI)

An electrostatic ion trap is used to trap Neq+(1?q?10) ions created by a fast xenon beam passing through neon gas. Decay of a given charge state during the trapping time is due to electron-capture collisions with the ambient gas. Measurement of the decay constant versus density yields a rate constant, from which an effective cross section is derived. Neq++Ne(q=3-10) and Neq++Xe(q=6-10) collisions have been studied at mean collision energies in the range 1.0-70.0 eV. Marked oscillation of the effective capture cross sections with charge at fixed mean collision energies is observed. A strong velocity dependence of the effective cross section (rising as the velocity decreases) is observed for several collision pairs.

M. H. Prior; Richard Marrus; C. R. Vane

1983-07-01T23:59:59.000Z

242

Absorption by cold Fermi atoms in a harmonic trap  

E-Print Network [OSTI]

We study the absorption spectrum for a strongly degenerate Fermi gas confined in a harmonic trap. The spectrum is calculated using both the exact summation and also the Thomas-Fermi (TF) approximation. In the latter case, relatively simple analytical expressions are obtained for the absorption lineshape at large number of trapped atoms. At zero temperature, the approximated lineshape is characterized by a $(1-z^2)^{5/2}$ dependence which agrees well with the exact numerical calculations. At non-zero temperature, the spectrum becomes broader, although remains non-Gaussian as long as the fermion gas is degenerate. The changes in the trap frequency for an electronically excited atom can introduce an additional line broadening.

Gediminas Juzeliunas; Marius Masalas

2000-11-10T23:59:59.000Z

243

Storing Electrons Instead of Positrons Without Trapping of Positive Ions  

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

Electrons Instead of Positrons Without Electrons Instead of Positrons Without Trapping of Positive Ions LS-75 T. K. Khoe October, 1986 In this note, a procedure to inject and store electrons in the ring without trapping ions will be described. The minimum injection current per bunch below which ion trapping occur will be determined. Since the vertical beam size is smaller than the horizontal beam size, we will consider the vertical motion only. The following assumptions are made: 1. The bunch period is much longer than the bunch length. This assumption allow us to use the thin lens approximation for the focusing effect of the electron bunch. 2. The bunch length is much larger than the transverse dimensions of the beam. A two-dimensional calculation can then be used to obtain the

244

Double Well Potentials and Quantum Phase Transitions in Ion Traps  

Science Journals Connector (OSTI)

We demonstrate that the radial degree of freedom of strings of trapped ions in the quantum regime may be prepared and controlled accurately through the variation of the external trapping potential while at the same time its properties are measurable with high spatial and temporal resolution. This provides a new testbed giving access to static and dynamical properties of the physics of quantum-many-body systems and quantum phase transitions that are hard to simulate on classical computers. Furthermore, it allows for the creation of double well potentials with experimentally accessible tunneling rates, with applications in testing the foundations of quantum physics and precision sensing.

A. Retzker; R. C. Thompson; D. M. Segal; M. B. Plenio

2008-12-30T23:59:59.000Z

245

Quantum Phase Transitions in a Linear Ion Trap  

E-Print Network [OSTI]

We show that the quantum phase transition of the Tavis-Cummings model can be realised in a linear ion trap of the kind proposed for quantum computation. The Tavis-Cummings model describes the interaction between a bosonic degree of freedom and a collective spin. In an ion trap, the collective spin system is a symmetrised state of the internal electronic states of N ions, while the bosonic system is the vibrational degree of freedom of the centre of mass mode for the ions.

G. J. Milburn; Paul Alsing

2000-03-01T23:59:59.000Z

246

Sympathetic Cooling with Two Atomic Species in an Optical Trap  

Science Journals Connector (OSTI)

We simultaneously trap ultracold lithium and cesium atoms in an optical dipole trap formed by the focus of a CO2 laser and study the exchange of thermal energy between the gases. The optically cooled cesium gas efficiently decreases the temperature of the lithium gas through sympathetic cooling. Equilibrium temperatures down to 25 ?K have been reached. The measured cross section for thermalizing 133Cs-7Li collisions is 810-12 cm2, for both species unpolarized in their lowest hyperfine ground state. Besides thermalization, we observe evaporation of lithium purely through elastic cesium-lithium collisions (sympathetic evaporation).

M. Mudrich; S. Kraft; K. Singer; R. Grimm; A. Mosk; M. Weidemller

2002-06-07T23:59:59.000Z

247

Electron Trapping in Shear Alfvn Waves that Power the Aurora  

Science Journals Connector (OSTI)

Results from 1D Vlasov drift-kinetic plasma simulations reveal how and where auroral electrons are accelerated along Earths geomagnetic field. In the warm plasma sheet, electrons become trapped in shear Alfvn waves, preventing immediate wave damping. As waves move to regions with larger vTe/vA, their parallel electric field decreases, and the trapped electrons escape their influence. The resulting electron distribution functions compare favorably with insitu observations, demonstrating for the first time a self-consistent link between Alfvn waves and electrons that form aurora.

Clare E. J. Watt and Robert Rankin

2009-01-26T23:59:59.000Z

248

Electron Trapping in Shear Alfven Waves that Power the Aurora  

SciTech Connect (OSTI)

Results from 1D Vlasov drift-kinetic plasma simulations reveal how and where auroral electrons are accelerated along Earth's geomagnetic field. In the warm plasma sheet, electrons become trapped in shear Alfven waves, preventing immediate wave damping. As waves move to regions with larger v{sub Te}/v{sub A}, their parallel electric field decreases, and the trapped electrons escape their influence. The resulting electron distribution functions compare favorably with in situ observations, demonstrating for the first time a self-consistent link between Alfven waves and electrons that form aurora.

Watt, Clare E. J.; Rankin, Robert [University of Alberta, Edmonton, Alberta (Canada)

2009-01-30T23:59:59.000Z

249

What To Do With Cold Traps and Why  

E-Print Network [OSTI]

of the 2012 Industrial Energy Technology Conference New Orleans, Louisiana, May 29-June 1, 2012 TABLE!1 Failure!Event Historical!Value Flare!Nozzle!Replacement $750,000! Analyzer!Failure!Plant!Shutdown $1,000,000! Flare"out!Fine $1,700,000! Gas... Orleans, Louisiana, May 29-June 1, 2012 TABLE!7 Failure!Events Annual!Cost!/!Trap (360!Traps!in!Unit) Flare!Nozzle!Replacement $694 Analyzer!Failure!Shuts!Plant $1,389 Flare"out!Fine $3,148 Gas!Compressor!Failure $5,000 Main!Turbine!Failure $11...

Risko, J. R.; Walter, J. P.

2012-01-01T23:59:59.000Z

250

Ion trapping in the emitter sheath in thermionic converters  

SciTech Connect (OSTI)

The effect of ion trapping in the emitter sheath in ignited thermionic converters is studied. The ion trapping prevents the emitter-sheath barrier from being higher than approximately 0.1 eV, when the current decreases in the converter. This gives a condition for the constriction of the arc. I-V curves are calculated for an ignited thermionic converter with a hydrodynamic plasma theory that takes into account the effect of Coulomb scattering and volume recombination, but assumes that the electron temperature is constant in the plasma.

Lundgren, L.

1985-12-01T23:59:59.000Z

251

Trapping dynamics of disilane on bare and monohydride-terminated Si(100)-21  

Science Journals Connector (OSTI)

The initial trapping probability of disilane on bare and monohydride-terminated Si(100)-21 surfaces was measured using molecular beam techniques. On the bare surface, trapping is shown to be very efficient, with near unit trapping probability at incident kinetic energies up to 0.2eV, and nearly 50% trapping at 1eV kinetic energy. The monohydride-terminated surface displays significantly less trapping efficiency than the bare surface. Interestingly, trapping probabilities decrease as the angle of incidence is increased, with the decrease becoming more pronounced at higher kinetic energies; this effect is discussed in terms of parallel momentum accommodation dynamics.

B.A. Ferguson; C.T. Reeves; C.B. Mullins

1999-01-01T23:59:59.000Z

252

Operation of a planar-electrode ion trap array with adjustable RF electrodes  

E-Print Network [OSTI]

One path to scaling-up trapped atomic ions for large-scale quantum computing and simulation is to create a two-dimensional array of ion traps in close proximity to each other. A method to control the interactions between nearest neighboring ions is demonstrated and characterized here, using an adjustable radio-frequency (RF) electrode between trapping sites. A printed circuit board planar-electrode ion trap is demonstrated, trapping laser-cooled $^{40}$Ca$^+$ ions. RF shuttling and secular-frequency adjustment are shown as a function of the power applied to the addressed RF electrode. The trapped ion's heating rate is measured via a fluorescence recooling method.

Muir Kumph; Philip Holz; Kirsten Langer; Michael Niedermayr; Michael Brownnutt; Rainer Blatt

2014-02-04T23:59:59.000Z

253

Investigation of the reaction of OH and CO to form H and CO? by photoelectron-photofragment coincidence spectroscopy in a cryogenic ion beam trap  

E-Print Network [OSTI]

spectroscopy in a cryogenic ion beam trap A dissertationspectroscopy in a cryogenic ion beam trap by Christopherof the inclusion of a cryogenic ion beam trap, and its

Johnson, Christopher Joseph

2011-01-01T23:59:59.000Z

254

Local Wettability Reversal during Steady-State Two-Phase Flow in Porous Media  

E-Print Network [OSTI]

We study the effect of local wettability reversal on remobilizing immobile fluid clusters in steady-state two-phase flow in porous media. We consider a two dimensional network model for porous medium and introduce a wettability alteration mechanism. A qualitative change in the steady state flow patterns, destabilizing the percolating and trapped clusters, is observed as the system wettability is varied. When capillary forces are strong a finite wettability alteration is necessary to move the system from single-phase to two-phase flow regime. For the case of both phases being mobile we find a linear relationship between fractional flow and wettability alteration.

Sinha, Santanu; degrden, Torgeir Bryge; Skjetne, Erik; Hansen, Alex; 10.1103/PhysRevE.84.037303

2012-01-01T23:59:59.000Z

255

Paul trapping of charged particles in aqueous solution  

Science Journals Connector (OSTI)

...1]. Oxygen plasma treatment was...surrounding ionic atmosphere to the motion of...ii) Trapping with large fluctuations...V) Frequency (MHz) b q a i 1...with the surface area of the particle...V, and f=2.5 MHz, using the device...

Weihua Guan; Sony Joseph; Jae Hyun Park; Predrag S. Krsti?; Mark A. Reed

2011-01-01T23:59:59.000Z

256

Measuring the Neutron Lifetime Using Magnetically Trapped Neutrons  

E-Print Network [OSTI]

The neutron beta-decay lifetime plays an important role both in understanding weak interactions within the framework of the Standard Model and in theoretical predictions of the primordial abundance of 4He in Big Bang Nucleosynthesis. In previous work, we successfully demonstrated the trapping of ultracold neutrons (UCN) in a conservative potential magnetic trap. A major upgrade of the apparatus is nearing completion at the National Institute of Standards and Technology Center for Neutron Research (NCNR). In our approach, a beam of 0.89 nm neutrons is incident on a superfluid 4He target within the minimum field region of an Ioffe-type magnetic trap. A fraction of the neutrons is downscattered in the helium to energies <200 neV, and those in the appropriate spin state become trapped. The inverse process is suppressed by the low phonon density of helium at temperatures less than 200 mK, allowing the neutron to travel undisturbed. When the neutron decays the energetic electron ionizes the helium, producing sci...

O'Shaughnessy, C M; Schelhammer, K W; Swank, C M; Seo, P -N; Huffman, P R; Dzhosyuk, S N; Mattoni, C E H; Yang, L; Doyle, J M; Coakley, K J; Thompson, A K; Mumm, H P; Lamoreaux, S K; Yang, G

2009-01-01T23:59:59.000Z

257

Non-Diversification Traps in Catastrophe Insurance Markets Rustam Ibragimov  

E-Print Network [OSTI]

markets, even though there is a large enough market capacity to reach full risk sharing throughNon-Diversification Traps in Catastrophe Insurance Markets Rustam Ibragimov Dwight Jaffee Johan Walden§ Abstract We develop a model for markets for catastrophic risk. The model explains why insurance

Chaudhuri, Sanjay

258

Gene Traps: Tools for Plant Development and Genomics  

Science Journals Connector (OSTI)

...activates GFP expression from the UAS. A battery of enhancer trap lines expressing this...genomic DNA flanking the insertions (). Thermal asymmetric interlaced PCR is particularly...Arabidopsis thaliana T-DNA insert junctions by thermal asymmetric interlaced PCR Lloyd A.M...

Patricia S. Springer

259

The TITAN in-trap decay spectroscopy facility at TRIUMF  

E-Print Network [OSTI]

This article presents an upgraded in-trap decay spectroscopy apparatus which has been developed and constructed for use with TRIUMF's Ion Trap for Atomic and Nuclear science (TITAN). This device consists of an open-access electron-beam ion-trap (EBIT), which is surrounded radially by seven low-energy planar Si(Li) detectors. The environment of the EBIT allows for the detection of low-energy photons by providing backing-free storage of the radioactive ions, while guiding charged decay particles away from the trap centre via the strong (up to 6 T) magnetic field. In addition to excellent ion confinement and storage, the EBIT also provides a venue for performing decay spectroscopy on highly-charged radioactive ions. Recent technical advancements have been able to provide a significant increase in sensitivity for low-energy photon detection, towards the goal of measuring weak electron-capture branching ratios of the intermediate nuclei in the two-neutrino double beta ($2\

K. G. Leach; A. Grossheim; A. Lennarz; T. Brunner; J. R. Crespo Lpez-Urrutia; A. T. Gallant; M. Good; R. Klawitter; A. A. Kwiatkowski; T. Ma; T. D. Macdonald; S. Seeraji; M. C. Simon; C. Andreoiu; J. Dilling; D. Frekers

2014-05-28T23:59:59.000Z

260

Trapping and Frequency Variability in Electron Acoustic Waves  

E-Print Network [OSTI]

Trapping and Frequency Variability in Electron Acoustic Waves C.F. Driscoll, F. Anderegg, D 92093 USA Abstract. Electron Acoustic Waves (EAWs) with a phase velocity less than twice the plasma Langmuir waves, and at large excitations resonance is observed over a broad range. Laser Induced

California at San Diego, University of

Note: This page contains sample records for the topic "lava flows trap" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
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We encourage you to perform a real-time search of NLEBeta
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261

Quantum Reservoir Engineering with Laser Cooled Trapped Ions  

Science Journals Connector (OSTI)

We show how to design different couplings between a single ion trapped in a harmonic potential and an environment. The coupling is due to the absorption of a laser photon and subsequent spontaneous emission. The variation of the laser frequencies and intensities allows one to engineer the coupling and select the master equation describing the motion of the ion.

J. F. Poyatos; J. I. Cirac; P. Zoller

1996-12-02T23:59:59.000Z

262

Light Trapping in Solar Cells Using Resonant Nanostructures P. Spinelli  

E-Print Network [OSTI]

Light Trapping in Solar Cells Using Resonant Nanostructures P. Spinelli #12;Summary Photovoltaics solar cell is reduced, due to incomplete absorption of light. In this thesis, we investigate new ways of enhancing light absorption in Si solar cells by using nanostructures that show resonant interaction

van Rooij, Robert

263

Landau Damping of Spin Waves in Trapped Boltzmann Gases  

E-Print Network [OSTI]

levels of trapped ultra-cold 87Rb atoms in the nondegenerate regimes. As in spin-polarized Boltzmann) where is the mean-field frequency, S+(z) = s+(z, p)n(p) dp and n(p) = (2mkBT)-1/2 exp[-p2/(2mk

Mullin, William J.

264

Momentum distribution and correlation function of quasicondensates in elongated traps  

Science Journals Connector (OSTI)

We calculate the spatial correlation function and momentum distribution of a phase-fluctuating, elongated three-dimensional condensate in a trap and in free expansion. We take the inhomogeneous density profile into account via a local-density approximation. We find an almost Lorentzian momentum distribution, in stark contrast with a Heisenberg-limited Thomas-Fermi condensate.

F. Gerbier; J. H. Thywissen; S. Richard; M. Hugbart; P. Bouyer; A. Aspect

2003-05-27T23:59:59.000Z

265

Quantifying, characterizing, and controlling information flow in ultracold atomic gases  

SciTech Connect (OSTI)

We study quantum information flow in a model comprised of a trapped impurity qubit immersed in a Bose-Einstein-condensed reservoir. We demonstrate how information flux between the qubit and the condensate can be manipulated by engineering the ultracold reservoir within experimentally realistic limits. We show that this system undergoes a transition from Markovian to non-Markovian dynamics, which can be controlled by changing key parameters such as the condensate scattering length. In this way, one can realize a quantum simulator of both Markovian and non-Markovian open quantum systems, the latter ones being characterized by a reverse flow of information from the background gas (reservoir) to the impurity (system).

Haikka, P. [Turku Center for Quantum Physics, Department of Physics and Astronomy, University of Turku, FIN-20014 Turku (Finland); McEndoo, S.; Maniscalco, S. [Turku Center for Quantum Physics, Department of Physics and Astronomy, University of Turku, FIN-20014 Turku (Finland); SUPA, EPS/Physics, Heriot-Watt University, Edinburgh, EH144AS (United Kingdom); De Chiara, G. [Fisica Teorica: Informacio i Fenomens Quantics, Universitat Autonoma de Barcelona, E-08193 Bellaterra (Spain); Centre for Theoretical Atomic, Molecular and Optical Physics, School of Mathematics and Physics, Queen's University, Belfast BT7 1NN (United Kingdom); Palma, G. M. [NEST Istituto Nanoscienze-CNR and Dipartimento di Fisica, Universita degli Studi di Palermo, via Archirafi 36, I-90123 Palermo (Italy)

2011-09-15T23:59:59.000Z

266

Multiple isotope magneto-optical trap from a single diode laser  

Science Journals Connector (OSTI)

We present a dual isotope magneto-optical trap produced using a single diode laser. We generate all the optical frequencies needed for trapping both species using a fiber intensity...

Valenzuela, Victor Manuel; Hamzeloui, Saeed; Gutirrez, Monica; Gomez, Eduardo

2013-01-01T23:59:59.000Z

267

GreenPower Trap Water-Muffler System | Department of Energy  

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

GreenPower Trap Water-Muffler System GreenPower Trap Water-Muffler System This hydrated EGR system reduces NOx and enhances fuel efficiency, and the DPF is catalyzed by the...

268

Loading a planar RF Paul Trap from a cold Yb? source  

E-Print Network [OSTI]

In this thesis, we demonstrate a functioning planar radio frequency, three-rod Paul Trap, loaded with Yb+ ions that have been photoionized from a source of neutral atoms, which were cooled in a magneto-optical trap. Planar ...

Shields, Brendan John

2006-01-01T23:59:59.000Z

269

Ensemble method to measure the potential energy of nanoparticles in an optical trap  

Science Journals Connector (OSTI)

A method is described for measuring the potential energy of nanoparticles in an optical trap by trapping an ensemble of particles with a focused laser beam. The force balance between...

Junio, Joseph; Ng, Jack; Cohen, Joel A; Lin, Zhifang; Ou-Yang, H Daniel

2011-01-01T23:59:59.000Z

270

Finite-geometry models of electric field noise from patch potentials in ion traps  

E-Print Network [OSTI]

We model electric field noise from fluctuating patch potentials on conducting surfaces by taking into account the finite geometry of the ion trap electrodes to gain insight into the origin of anomalous heating in ion traps. ...

Low, Guang Hao

271

Intra-catalyst Reductant Chemistry in Lean NOx Traps: A Study...  

Broader source: Energy.gov (indexed) [DOE]

Intra-catalyst Reductant Chemistry in Lean NOx Traps: A Study on Sulfur Effects Intra-catalyst Reductant Chemistry in Lean NOx Traps: A Study on Sulfur Effects Presentation given...

272

Hydrogen and helium entrapment in flowing liquid metal plasma-facing surfaces  

E-Print Network [OSTI]

Hydrogen and helium entrapment in flowing liquid metal plasma-facing surfaces Ahmed Hassanein the PFC surface (helium and hydrogen isotopes) while accommodating high heat loads. To study this problem. Hydrogen isotope (DT) particles are likely be trapped in the liquid metal surface (e.g., lithium) due

Harilal, S. S.

273

An all-glass microfluidic cell for the ABEL trap: fabrication and Adam E. Cohen  

E-Print Network [OSTI]

An all-glass microfluidic cell for the ABEL trap: fabrication and modeling Adam E. Cohen Department trap is a microfluidic cell. In previous incarnations of the ABEL trap, the microfluidic cell microfluidic cell, made entirely out of glass. This new design significantly decreases the rate

Shapiro, Benjamin

274

How to assess light trapping structures versus a Lambertian Scatterer for solar cells ?  

E-Print Network [OSTI]

How to assess light trapping structures versus a Lambertian Scatterer for solar cells ? Christian trapping nanostructures for solar cells, which we call the light trapping efficiency (LTE). The LTE has in thin Si solar cells by diffuse back reflectors," Proceedings of the 15th IEEE Photovoltaic Specialists

275

Reduction of the trapping of positrons in dislocated single crystals of iron when charged with hydrogen  

SciTech Connect (OSTI)

The positron annihilation measurement was carried out with the pure iron single crystals deformed in various ways before and after hydrogen permeation. The positron trapping intensity was reduced more in the screw dislocation than in the edge dislocation by hydrogen charging. The trap occupancy by hydrogen was very close to the fraction of the reduction in positron trapping intensity.

Park, Y.K.; Waber, J.T.; Snead, C.L. Jr.

1985-01-01T23:59:59.000Z

276

Solar Cell Light Trapping beyond the Ray Optic Limit Dennis M. Callahan,* Jeremy N. Munday,  

E-Print Network [OSTI]

Solar Cell Light Trapping beyond the Ray Optic Limit Dennis M. Callahan,* Jeremy N. Munday: Photovoltaic cell, solar cell, local density of optical states (LDOS), light trapping, plasmonic, nanophotonic light trapping, as the solar cell absorber layer thickness is reduced, absorption is also reduced

Atwater, Harry

277

Towards trapped antihydrogen L.V. Jrgensen a,*, G. Andresen b  

E-Print Network [OSTI]

of antihydrogen physics. The next big step forward is expected to be the trapping of the formed antihydrogen atoms using a magnetic multipole trap. ALPHA is a new international project that started to take data in 2006 in a nested Penning trap [3]. After formation the antihydrogen was no longer bound by the electric

Wurtele, Jonathan

278

Can We Accurately Model Fluid Flow in Shale?  

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

Can We Accurately Model Fluid Flow Can We Accurately Model Fluid Flow in Shale? Can We Accurately Model Fluid Flow in Shale? Print Thursday, 03 January 2013 00:00 Over 20 trillion cubic meters of natural gas are trapped in shale, but many shale oil and gas producers still use models of underground fluid flow that date back to the heyday of easy-to-tap gas and liquid crude. The source of shale oil and gas is kerogen, an organic material in the shale, but until now kerogen hasn't been incorporated in mathematical models of shale gas reservoirs. Paulo Monteiro, Chris Rycroft, and Grigory Isaakovich Barenblatt, with the Computational Research Division and the Advanced Light Source, recently modeled how pressure gradients in the boundary layer between kerogen inclusions and shale matrices affect productivity and can model reservoir longevity.

279

Low volume flow meter  

DOE Patents [OSTI]

The low flow monitor provides a means for determining if a fluid flow meets a minimum threshold level of flow. The low flow monitor operates with a minimum of intrusion by the flow detection device into the flow. The electrical portion of the monitor is externally located with respect to the fluid stream which allows for repairs to the monitor without disrupting the flow. The electronics provide for the adjustment of the threshold level to meet the required conditions. The apparatus can be modified to provide an upper limit to the flow monitor by providing for a parallel electronic circuit which provides for a bracketing of the desired flow rate.

Meixler, Lewis D. (East Windsor, NJ)

1993-01-01T23:59:59.000Z

280

Lava Dome | Open Energy Information  

Open Energy Info (EERE)

"coulees." Volcanic domes commonly occur within the craters or on the flanks of large composite volcanoes. The nearly circular Novarupta Dome that formed during the 1912 eruption...

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


281

Probing Prokaryotic Social Behaviors with Bacterial Lobster Traps  

Science Journals Connector (OSTI)

...while limiting the exit rate. Fabrication of the bacterial...cover glass of a single-pass flow cell, allowing bacteria...modulate solution flow rates around the cavity, limitations...Tsunami; Spectra-Physics) operating at 740-nm...VWR) within a single-pass flow cell system (42...

Jodi L. Connell; Aimee K. Wessel; Matthew R. Parsek; Andrew D. Ellington; Marvin Whiteley; Jason B. Shear

2010-10-01T23:59:59.000Z

282

Propeller Flow Meter  

E-Print Network [OSTI]

Propeller flow meters are commonly used to measure water flow rate. They can also be used to estimate irrigation water use. This publication explains how to select, install, read and maintain propeller flow meters....

Enciso, Juan; Santistevan, Dean; Hla, Aung K.

2007-10-01T23:59:59.000Z

283

Dispersed flow film boiling  

E-Print Network [OSTI]

Dispersed flow consists of small liquid droplets entrained in a flowing vapor. This flow regime can occur in cryogenic equipment, in steam generators, and during nuclear reactor loss of coolant accidents. A theoretical ...

Yoder, Graydon L.

1980-01-01T23:59:59.000Z

284

Bacteria in shear flow  

E-Print Network [OSTI]

Bacteria are ubiquitous and play a critical role in many contexts. Their environment is nearly always dynamic due to the prevalence of fluid flow: creeping flow in soil, highly sheared flow in bodily conduits, and turbulent ...

Marcos, Ph.D. Massachusetts Institute of Technology

2011-01-01T23:59:59.000Z

285

A comparison study of gravid and under house CO2 mosquito traps in Harris County, Texas  

E-Print Network [OSTI]

Traps in Harris County, Texas. (May 2008) Stephanie Lyn White, B.S.; B.S., Texas A&M University Chair of Advisory Committee: Dr. Michael P. Ward Harris County Mosquito Control Division (HCMCD) is responsible for surveillance of mosquito species...2 traps for WNV and SLE virus surveillance. Adjusting for the week of collection, results suggest that Gravid traps caught significantly (P = 0.009) more mosquitoes (mean = 23.134 per trap) in the study area than Underhouse traps (mean = 3...

White, Stephanie Lyn

2008-10-10T23:59:59.000Z

286

A Toy Model Study of Decay Trapping | Superconducting Magnet Division  

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

A Toy Model Study of Decay Trapping, reported by Brett Parker A Toy Model Study of Decay Trapping, reported by Brett Parker Introduction A group from the BNL Superconducting Magnet Division is looking at various options for dipole magnets which would be suitable for use in a muon storage ring that is used as a neutrino factory. Since the useful neutrino beams from a neutrino factory come from straight sections it is desirable to minimize the rings arc circumference, in relation to straight section length, in order to ensure that the fraction of muons which decay in the straight section is as large as possible. Therefore superconducting magnets, with higher B-fields and smaller bend radii, are reasonable to consider for this application. Unfortunately the decay electrons generated along with the neutrinos carry on average about a third of the original

287

A bosonic Josephson junction controlled by a single trapped ion  

E-Print Network [OSTI]

We theoretically investigate the properties of a double-well bosonic Josephson junction coupled to a single trapped ion. We find that the coupling between the wells can be controlled by the internal state of the ion, which can be used for studying mesoscopic entanglement between the two systems and to measure their interaction with high precision. As a particular example we consider a single $^{87}$Rb atom and a small Bose-Einstein condensate controlled by a single $^{171}$Yb$^+$ ion. We calculate inter-well coupling rates reaching hundreds of Hz, while the state dependence amounts to tens of Hz for plausible values of the currently unknown s-wave scattering length between the atom and the ion. The analysis shows that it is possible to induce either the self-trapping or the tunneling regime, depending on the internal state of the ion. This enables the generation of large scale ion-atomic wavepacket entanglement within current technology.

R. Gerritsma; A. Negretti; H. Doerk; Z. Idziaszek; T. Calarco; F. Schmidt-Kaler

2012-07-25T23:59:59.000Z

288

Electromagnetic two-dimensional analysis of trapped-ion eigenmodes  

SciTech Connect (OSTI)

A two-dimensional electromagnetic analysis of the trapped-ion instability for the tokamak case with ..beta.. not equal to 0 has been made, based on previous work in the electrostatic limit. The quasineutrality condition and the component of Ampere's law along the equilibrium magnetic field are solved for the perturbed electrostatic potential and the component of the perturbed vector potential along the equilibrium magnetic field. The general integro-differential equations are converted into a matrix eigenvalue-eigenfunction problem by expanding in cubic B-spline finite elements in the minor radius and in Fourier harmonics in the poloidal angle. A model MHD equilibrium with circular, concentric magnetic surfaces and large aspect ratio is used which is consistent with our assemption that B << 1. The effect on the trapped-ion mode of including these electromagnetic extensions to the calculation is considered, and the temperature (and ..beta..) scaling of the mode frequency is shown and discussed.

Kim, D.; Rewoldt, G.

1984-11-01T23:59:59.000Z

289

Photoionization of strontium for trapped-ion quantum information processing  

E-Print Network [OSTI]

We report a demonstration of simple and effective loading of strontium ions into a linear radio frequency Paul trap using photoionization. The ionization pathway is 5s2 1S0 -- 5s5p 1P1 -- 5p2 1D2, and the 5p2 1D2 final state is auto-ionizing. Both transitions are driven using diode lasers: a grating-stabilized 922 nm diode doubled in a single pass through potassium niobate to 461 nm and a bare diode at 405 nm. Using this technique, we have reduced the background pressure during the ion loading process by a factor of 2 compared to the conventional technique of electron bombardment. Initial ion temperatures are low enough that the ions immediately form crystals. It is also possible to observe the trapping region with a CCD camera during ion creation, allowing specific ion number loading with high probability.

K. Vant; J. Chiaverini; W. Lybarger; D. J. Berkeland

2006-07-07T23:59:59.000Z

290

Measurement-Induced Vibrational Dynamics of a Trapped Ion  

Science Journals Connector (OSTI)

Excitation spectra of an individual trapped 138Ba+ ion show sidebands of radial and axial ion vibration in the trap. The second-order sidebands involving radial and axial vibrations would allow swapping these vibrational states; they represent an inverse Raman effect with the role of electronic and vibrational excitation interchanged. Deexcitation sidebands differ from excitation sidebands as the vibrational distribution in the D5/2 level is modified by the ion being reduced to this level in null observations of resonance light. Delayed deexcitation goes along with stochastic cooling that makes the ion collapse into the Fock state |n=1?. Sideband modulation is identified as stroboscopic detection of the light-induced nutation on a vibrational transition with ?n=1.

B. Appasamy; Y. Stalgies; P. E. Toschek

1998-03-30T23:59:59.000Z

291

Engineering two-mode interactions in ion traps  

E-Print Network [OSTI]

We describe how two vibrational degrees of freedom of a single trapped ion can be coupled through the action of suitably-chosen laser excitation. We concentrate on a two-dimensional ion trap with dissimilar vibrational frequencies in the x- and y-directions of motion, and derive from first principles a variety of quantized two-mode couplings, concentrating on a linear coupling which takes excitations from one mode to another. We demonstrate how this can result in a state rotation, in which it is possible to transfer the motional state of the ion from say the x-direction to the y-direction without prior knowledge of that motional state.

J. Steinbach; J. Twamley; P. L. Knight

1997-08-04T23:59:59.000Z

292

Engineering superpositions of displaced number states of a trapped ion  

E-Print Network [OSTI]

We present a protocol that permits the generation of a subtle with superposition with 2^(l+1) displaced number states on a circle in phase space as target state for the center-of-mass motion of a trapped ion. Through a sequence of 'l' cycles involving the application of laser pulses and no-fluorescence measurements, explicit expressions for the total duration of laser pulses employed in the sequence and probability of getting the ion in the upper electronic state during the 'l' cycles are obtained and analyzed in detail. Furthermore, assuming that the effective relaxation process of a trapped ion can be described in the framework of the standard master equation for the damped harmonic oscillator, we investigate the degradation of the quantum interference effects inherent to superpositions via Wigner function.

Marcelo A. Marchiolli; Wagner D. Jose

2004-04-05T23:59:59.000Z

293

Freely floating structures trapping time-harmonic water waves (revisited)  

E-Print Network [OSTI]

We study the coupled small-amplitude motion of the mechanical system consisting of infinitely deep water and a structure immersed in it. The former is bounded above by a free surface, whereas the latter is formed by an arbitrary finite number of surface-piercing bodies floating freely. The mathematical model of time-harmonic motion is a spectral problem in which the frequency of oscillations serves as the spectral parameter. It is proved that there exist axisymmetric structures consisting of $N \\geq 2$ bodies; every structure has the following properties: (i) a time-harmonic wave mode is trapped by it; (ii) some of its bodies (may be none) are motionless, whereas the rest of the bodies (may be none) are heaving at the same frequency as water. The construction of these structures is based on a generalization of the semi-inverse procedure applied earlier for obtaining trapping bodies that are motionless although float freely.

Nikolay Kuznetsov; Oleg Motygin

2014-10-22T23:59:59.000Z

294

Wolf Trap, Virginia: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Trap, Virginia: Energy Resources Trap, Virginia: Energy Resources Jump to: navigation, search Equivalent URI DBpedia Coordinates 38.9398329°, -77.286094° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":38.9398329,"lon":-77.286094,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

295

Isoelectric Trapping and Mass Spectrometry: Tools for Proteomics  

E-Print Network [OSTI]

ISOELECTRIC TRAPPING AND MASS SPECTROMETRY: TOOLS FOR PROTEOMICS A Dissertation by STEPHANIE MARIE COLOGNA Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements... of Texas A&M University in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY Approved by: Chair of Committee, David H. Russell Committee Members, Paul S. Cremer Arul Jayaraman Gyula Vigh Head of Department, David H...

Cologna, Stephanie Marie

2012-02-14T23:59:59.000Z

296

Qualitative analysis of trapped Dirac fermions in graphene  

E-Print Network [OSTI]

We study the confinement of Dirac fermions in graphene and in carbon nanotubes by an external magnetic field, mechanical deformations or inhomogeneities in the substrate. By applying variational principles to the square of the Dirac operator, we obtain sufficient and necessary conditions for confinement of the quasi-particles. The rigorous theoretical results are illustrated on the realistic examples of the three classes of traps.

Vit Jakubsky; David Krejcirik

2014-05-11T23:59:59.000Z

297

Adiabatic trapping in coupled kinetic Alfven-acoustic waves  

SciTech Connect (OSTI)

In the present work, we have discussed the effects of adiabatic trapping of electrons on obliquely propagating Alfven waves in a low {beta} plasma. Using the two potential theory and employing the Sagdeev potential approach, we have investigated the existence of arbitrary amplitude coupled kinetic Alfven-acoustic solitary waves in both the sub and super Alfvenic cases. The results obtained have been analyzed and presented graphically and can be applied to regions of space where the low {beta} assumption holds true.

Shah, H. A.; Ali, Z. [Department of Physics, G.C. University, 54000 Lahore (Pakistan); Masood, W. [COMSATS, Institute of Information Technology, Park Road, Chak Shahzad, Islamabad 44000 (Pakistan); National Centre for Physics (NCP), Shahdara Valley Road, 44000 Islamabad (Pakistan); Theoretical Plasma Physics Division, P. O. Nilore, Islamabad (Pakistan)

2013-03-15T23:59:59.000Z

298

Qualitative analysis of trapped Dirac fermions in graphene  

E-Print Network [OSTI]

We study the confinement of Dirac fermions in graphene and in carbon nanotubes by an external magnetic field, mechanical deformations or inhomogeneities in the substrate. By applying variational principles to the square of the Dirac operator, we obtain sufficient and necessary conditions for confinement of the quasi-particles. The rigorous theoretical results are illustrated on the realistic examples of the three classes of traps.

Vit Jakubsky; David Krejcirik

2015-01-07T23:59:59.000Z

299

Phase-dependent coherent population trapping and optical switching  

SciTech Connect (OSTI)

We propose a scheme for achieving phase-dependent coherent population trapping, showing that both the dark state of the atoms and light propagation dynamics depend on the relative phase of the fields. The atomic coherence prepared via adiabatic process plays a key role in the interaction of light with matter. And an optical switching based on the phase-controlled quantum interference is implemented, which may have potential application in high-speed optical communications and quantum information systems.

Kou, J. [College of Physics, Jilin University, Changchun 130023 (China); Quantum Engineering Center, Beijing Institute of Control Device, Beijing 100854 (China); Wan, R. G.; Kang, Z. H.; Jiang, L.; Wang, L.; Jiang, Y.; Gao, J. Y. [College of Physics, Jilin University, Changchun 130023 (China)

2011-12-15T23:59:59.000Z

300

Fabrication and heating rate study of microscopic surface electrode ion traps  

E-Print Network [OSTI]

We report heating rate measurements in a microfabricated gold-on-sapphire surface electrode ion trap with trapping height of approximately 240 micron. Using the Doppler recooling method, we characterize the trap heating rates over an extended region of the trap. The noise spectral density of the trap falls in the range of noise spectra reported in ion traps at room temperature. We find that during the first months of operation the heating rates increase by approximately one order of magnitude. The increase in heating rates is largest in the ion loading region of the trap, providing a strong hint that surface contamination plays a major role for excessive heating rates. We discuss data found in the literature and possible relation of anomalous heating to sources of noise and dissipation in other systems, namely impurity atoms adsorbed on metal surfaces and amorphous dielectrics.

N. Daniilidis; S. Narayanan; S. A. Mller; R. Clark; T. E. Lee; P. J. Leek; A. Wallraff; St. Schulz; F. Schmidt-Kaler; H. Hffner

2010-09-15T23:59:59.000Z

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


301

Flow Distances on Open Flow Networks  

E-Print Network [OSTI]

Open flow network is a weighted directed graph with a source and a sink, depicting flux distributions on networks in the steady state of an open flow system. Energetic food webs, economic input-output networks, and international trade networks, are open flow network models of energy flows between species, money or value flows between industrial sectors, and goods flows between countries, respectively. Flow distances (first-passage or total) between any given two nodes $i$ and $j$ are defined as the average number of transition steps of a random walker along the network from $i$ to $j$ under some conditions. They apparently deviate from the conventional random walk distance on a closed directed graph because they consider the openness of the flow network. Flow distances are explicitly expressed by underlying Markov matrix of a flow system in this paper. With this novel theoretical conception, we can visualize open flow networks, calculating centrality of each node, and clustering nodes into groups. We apply fl...

Guo, Liangzhu; Shi, Peiteng; Wang, Jun; Huang, Xiaohan; Zhang, Jiang

2015-01-01T23:59:59.000Z

302

Plasma production by the trapping of energetic atoms  

Science Journals Connector (OSTI)

The production of a hot plasma by the injection of streams of energetic atoms into a confining magnetic field is discussed. The experiments described are directed towards injection of 20-keV hydrogen or deuterium atoms into a magnetic mirror field. The results of some numerical calculations of the plasma growth to a steady-state in a constant magnetic field are presented, including the calculation of the spatial distribution of the trapped ions. In these calculations, the primary trapping mechanism is the ionization of beam atoms by trapped ions and electrons. Parametric values are assigned to approximate the experimentally attainable conditions. The indicated equilibrium densities are in the range of 1014/cm3, at ? ? 1%, with typical growth times of a few seconds, if the final density is determined by ion-ion scattering into the mirror loss cone.The practical achievement of a hot plasma by this injection method depends upon maximizing the trapping rate, and minimizing the particle loss due to charge-exchange scattering. Severe requirements are therefore placed on the atomic beam intensity and the gas density in the confinement region. Some of the requirements on the build-up conditions imposed by plasma stability considerations are also discussed.Progress toward meeting the technological requirements is described. A highly collimated beam of hydrogen atoms in excess of 5 1017 atoms/sec at 20-keV energy has been produced. The cross-sectional area of the beam is 20 cm2 at a distance of 360 cm from the source; the half-angle divergence is less than 10 milliradians. Vacuum techniques have been developed to achieve base pressures in the 10?10 mm Hg range without extensive bakeout procedure. At the same time pumping speeds exceeding 105l/sec for hydrogen are available.A method of trapping the energetic atoms by means of a transient cold plasma is also discussed. This procedure greatly increases the initial plasma growth rate. The plasma density attainable depends upon the beam intensity, vacuum, and cold plasma density, the latter two being time-dependent. The generation of a suitable cold plasma is described.

C.C. Damm; A.H. Futch; F. Gordon; A.L. Hunt; E.C. Popp; R.F. Post; J.F. Steinhaus

1961-01-01T23:59:59.000Z

303

February 1, 1994 / Vol. 19, No. 3 / OPTICS LETTERS Spin relaxation of optically trapped atoms by light scattering  

E-Print Network [OSTI]

February 1, 1994 / Vol. 19, No. 3 / OPTICS LETTERS Spin relaxation of optically trapped atoms of optically trapped atoms that is due to light scattering from the trap laser. We observe relaxation times greater than 2 s for ground-state hyperfine-levelpopulations of 85 Rb atoms trapped in an optical dipole

Heinzen, Daniel J.

304

Heating rates in collisionally opaque alkali-metal atom traps: Role of secondary collisions  

Science Journals Connector (OSTI)

Grazing collisions with background gas are the major cause of trap loss and trap heating in atom traps. To first order, these effects do not depend on the trap density. In collisionally opaque trapped atom clouds, however, scattered atoms with an energy E larger than the effective trap depth Eeff, which are destined to escape from the atom cloud, will have a finite probability for a secondary collision. This results in a contribution to the heating rate that depends on the column density ?nl? of the trapped atoms, i.e., the product of density and characteristic size of the trap. For alkali-metal atom traps, secondary collisions are quite important due to the strong long-range interaction with like atoms. We derive a simple analytical expression for the secondary heating rate, showing a dependency proportional to ?nl??Eeff1/2. When extrapolating to a vanishing column density, only primary collisions with the background gas will contribute to the heating rate. This contribution is rather small, due to the weak long-range interaction of the usual background gas species in an ultrahigh-vacuum systemHe, Ne, or Arwith the trapped alkali-metal atoms. We conclude that the transition between trap-loss collisions and heating collisions is determined by a cutoff energy 200??K<~Eeff<~400??K, much smaller than the actual trap depth E in most magnetic traps. Atoms with an energy Eefftrap temperatures. We present results of secondary heating rates for the alkali-metal atoms Li through Cs as a function of the effective trap depth, the column density of the trap, and the species in the background gas. The predictions of our model are in good agreement with the experimental data of Myatt for heating rates in high-density 87Rb-atom magnetic traps at JILA, including the effect of the rf shield and the composition of the background gas. It is shown that collisions with atoms from the Oort cloud also contribute to the heating rate. For 85Rb the calculated heating rate is below the experimentally observed value at JILA, supporting the idea that inelastic collisions in the trap are the major source of heating.

H. C. W. Beijerinck

2000-11-15T23:59:59.000Z

305

Portable wastewater flow meter  

DOE Patents [OSTI]

A portable wastewater flow meter particularly adapted for temporary use at a single location in measuring the rate of liquid flow in a circular entrance conduit of a sewer manhole both under free flow and submerged, open channel conditions and under fill pipe, surcharged conditions, comprising an apparatus having a cylindrical external surface and an inner surface that constricts the flow through the apparatus in such a manner that a relationship exists between (1) the difference between the static pressure head of liquid flowing through the entrance of the apparatus and the static pressure head of liquid flowing through the constriction, and (2) the rate of liquid flow through the apparatus.

Hunter, Robert M. (320 S. Wilson Ave., Bozeman, MT 59715)

1999-02-02T23:59:59.000Z

306

Portable wastewater flow meter  

DOE Patents [OSTI]

A portable wastewater flow meter particularly adapted for temporary use at a single location in measuring the rate of liquid flow in a circular entrance conduit of a sewer manhole both under free flow and submerged, open channel conditions and under full pipe, surcharged conditions, comprising an apparatus having a cylindrical external surface and an inner surface that constricts the flow through the apparatus in such a manner that a relationship exists between (1) the difference between the static pressure head of liquid flowing through the entrance of the apparatus and the static pressure head of liquid flowing through the constriction, and (2) the rate of liquid flow through the apparatus.

Hunter, Robert M. (320 S. Wilson Ave., Bozeman, MT 59715)

1990-01-01T23:59:59.000Z

307

Drunken robber, tipsy cop: First passage times, mobile traps, and Hopf bifurcations  

E-Print Network [OSTI]

For a random walk on a confined one-dimensional domain, we consider mean first passage times (MFPT) in the presence of a mobile trap. The question we address is whether a mobile trap can improve capture times over a stationary trap. We consider two scenarios: a randomly moving trap and an oscillating trap. In both cases, we find that a stationary trap actually performs better (in terms of reducing expected capture time) than a very slowly moving trap; however, a trap moving sufficiently fast performs better than a stationary trap. We explicitly compute the thresholds that separate the two regimes. In addition, we find a surprising relation between the oscillating trap problem and a moving-sink problem that describes reduced dynamics of a single spike in a certain regime of the Gray-Scott model. Namely, the above-mentioned threshold corresponds precisely to a Hopf bifurcation that induces oscillatory motion in the location of the spike. We use this correspondence to prove the uniqueness of the Hopf bifurcation.

Justin C. Tzou; Shuangquan Xie; Theodore Kolokolnikov

2014-10-03T23:59:59.000Z

308

Influence of different configurations of a catalyst and a trap on particulate emission of a diesel passenger car  

Science Journals Connector (OSTI)

New particulate emission measurements performed on a diesel passenger car to see the influence of different configurations of after-treatment systems are reported. Five combinations of a particle trap and an oxidation catalyst are investigated. These configurations are discussed in view of particulate emission, measured by number and mass. All measurements were carried out at a chassis dynamometer of the EMPA. A diesel passenger car with an IDI engine was operated at four steady state conditions. Exhaust gas was diluted in a standard constant volume sampler (CVS) device (full flow dilution tunnel). Particulate size distributions were measured with a scanning mobility particle sizer (SMPS) and gravimetric measurements were performed according to regulations. Furthermore, measurements without CVS tunnel were done by using external dilution units to see the influence of the sampling method. We used a thermo desorber to distinguish volatile and non-volatile aerosol fractions and we analysed filter samples for determination of organic soluble fraction, water-soluble fraction and sulphur content. Huge differences depending on the configuration of the after-treatment system and load were observed. In general it was found that a large reduction of particulate emission could be obtained by using a particle trap. A catalyst converter has minor effect on particulate emission. Nucleation of new particles was observed under certain conditions depending on configuration and sampling method.

Urs Lehmann; Martin Mohr

2001-01-01T23:59:59.000Z

309

Nuclear spin qubits in a trapped-ion quantum computer  

E-Print Network [OSTI]

Physical systems must fulfill a number of conditions to qualify as useful quantum bits (qubits) for quantum information processing, including ease of manipulation, long decoherence times, and high fidelity readout operations. Since these conditions are hard to satisfy with a single system, it may be necessary to combine different degrees of freedom. Here we discuss a possible system, based on electronic and nuclear spin degrees of freedom in trapped ions. The nuclear spin yields long decoherence times, while the electronic spin, in a magnetic field gradient, provides efficient manipulation, and the optical transitions of the ions assure a selective and efficient initialization and readout.

M. Feng; Y. Y. Xu; F. Zhou; D. Suter

2009-04-26T23:59:59.000Z

310

Effect of Trapped Energetic Particles on the Resistive Wall Mode  

SciTech Connect (OSTI)

A stability analysis for the resistive wall mode is studied in the presence of trapped energetic particles (EPs). When the EPs' beta exceeds a critical value, a fishbonelike bursting mode (FLM) with an external kink eigenstructure can exist. This offers the first analytic interpretation of the experimental observations [Phys. Rev. Lett. 103, 045001 (2009)]. The mode-particle resonances for the FLM and the q=1 fishbone occur in different regimes of the precession frequency of EPs. In certain ranges of the plasma rotation speed and the EPs' beta, a mode conversion can occur between the resistive wall mode and FLM.

Hao, G. Z.; Wang, A. K.; Qiu, X. M. [Southwestern Institute of Physics, Post Office Box 432, Chengdu 610041 (China); Liu, Y. Q. [Euratom/CCFE Fusion Association, Culham Science Centre, Abingdon, Oxon OX14 3DB (United Kingdom)

2011-07-01T23:59:59.000Z

311

Equilibrium state of a trapped two-dimensional Bose gas  

Science Journals Connector (OSTI)

We study experimentally and numerically the equilibrium density profiles of a trapped two-dimensional Rb87 Bose gas and investigate the equation of state of the homogeneous system using the local density approximation. We find a clear discrepancy between in situ measurements and quantum Monte Carlo simulations, which we attribute to a nonlinear variation of the optical density of the atomic cloud with its spatial density. However, good agreement between experiment and theory is recovered for the density profiles measured after time of flight, taking advantage of their self-similarity in a two-dimensional expansion.

Steffen P. Rath, Tarik Yefsah, Kenneth J. Gnter, Marc Cheneau, Rmi Desbuquois, Markus Holzmann, Werner Krauth, and Jean Dalibard

2010-07-12T23:59:59.000Z

312

Prospects for cooling and trapping rotationally hot molecules  

Science Journals Connector (OSTI)

Cold collisions involving highly rotationally excited diatomic molecules are investigated. As the translational energy is lowered, the total inelastic cross section decreases sharply for specific channels where quasiresonant transitions are no longer energetically allowed. Rate coefficients are given for collisional quenching of rotationally excited H2,D2,T2, and O2 at zero temperature. The specific rotational states that are stable against collisional relaxation would be interesting prospects for cooling and trapping. The application of collisional cooling methods together with recently developed schemes for producing rotationally hot molecules may allow high densities of ultracold super rotors to be achieved.

R. C. Forrey

2002-08-27T23:59:59.000Z

313

Stabilization of the resistive wall mode instability by trapped energetic particles  

SciTech Connect (OSTI)

A theoretical model for investigating the effect of the trapped energetic particles (EPs) on the resistive wall mode (RWM) instability is proposed. The results demonstrate that the trapped EPs have a dramatic stabilizing effect on the RWM because of resonant interaction between the mode and the magnetic precession drift motion of the trapped EPs. The results also show that the effect of the trapped EPs depends on the wall position. In addition, the stabilizing effect becomes stronger when the plasma rotation is taken into account. For sufficiently fast plasma rotation, the trapped EPs can lead to the complete stabilization of the RWM. Furthermore, the trapped EPs can induce a finite real frequency of the RWM in the absence of plasma rotation.

Hao, G. Z.; Wang, A. K.; Jiang, H. B.; Lu, Gaimin; He, H. D.; Qiu, X. M. [Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041 (China); Liu, Y. Q. [Euratom/CCFE Fusion Association, Culham Science Centre, Abingdon, Oxon OX14 3DB (United Kingdom)

2011-03-15T23:59:59.000Z

314

Destruction of attractive bosonic cloud due to high spatial coherence in tight trap  

SciTech Connect (OSTI)

We study coherence of a trapped bosonic cloud with attractive finite-range interaction in a tight harmonic trap. One-body density and pair-distribution function in the ground state for different trap sizes are calculated. We also calculate healing length and the correlation length which signify the presence of high spatial coherence in a very tight trap leading to the destruction of the condensate for a fixed particle number. This is in marked variance with the usual collapse of the attractive metastable condensate when N>N{sub cr}. Thus we investigate the critical frequency and critical size of the trap for the existence of attractive Bose-Einstein condensation. The finite-range interaction gives a nonlocal effect in the effective many-body potential, and we observe a high-density stable branch besides the known metastable branch. Moreover, the new branch shows universal behavior even in the very tight trap.

Biswas, Anindya; Das, Tapan Kumar [Department of Physics, University of Calcutta, 92 A.P.C. Road, Kolkata 700009 (India); Chakrabarti, Barnali [Instituto de Fisica, Universidade of Sao Paulo, CP 66318, 05315-970 Sao Paulo-SP (Brazil); Department of Physics, Lady Brabourne College, P1/2 Surawardi Avenue, Kolkata 700017 (India); Salasnich, Luca [Dipartimento di Fisica ''Galileo Galilei'' and CNISM, Universita di Padova, Via Marzolo 8, IT-35122 Padova (Italy)

2011-10-15T23:59:59.000Z

315

Fast shuttling of a trapped ion in the presence of noise  

E-Print Network [OSTI]

We theoretically investigate the motional excitation of a single ion caused by spring-constant and position uctuations of a harmonic trap during trap shuttling processes. A detailed study of the sensitivity on noise for several transport protocols and noise spectra is provided. The e?ect of slow spring-constant drifts is also analyzed. Trap trajectories that minimize the excitation are designed combining invariant-based inverse engineering, perturbation theory, and optimal control.

Xiao-Jing Lu; J. G. Muga; Xi Chen; U. G. Poschinger; F. Schmidt-Kaler; A. Ruschhaupt

2014-04-16T23:59:59.000Z

316

Light trapping and near-unity solar absorption in a three-dimensional photonic-crystal  

E-Print Network [OSTI]

Light trapping and near-unity solar absorption in a three-dimensional photonic-crystal Ping Kuang,1 opens up a new door for light trapping and near-unity solar absorption over broad s and wide angles://dx.doi.org/10.1364/OL.38.004200 There is a great deal of interest in efficient light trapping in thin film solar

John, Sajeev

317

Efficient Collection of 221Fr into a Vapor Cell Magneto-optical Trap  

Science Journals Connector (OSTI)

We have efficiently loaded a vapor cell magneto-optical trap from an orthotropic source of 221Fr with a trapping efficiency of 56(10)%. A novel detection scheme allowed us to measure 900 trapped atoms with a signal to noise ratio of ?60 in 1 sec. We have measured the energies and the hyperfine constants of the 7P1/22 and 7P3/22 states.

Z.-T. Lu; K. L. Corwin; K. R. Vogel; C. E. Wieman; T. P. Dinneen; J. Maddi; Harvey Gould

1997-08-11T23:59:59.000Z

318

E-Print Network 3.0 - antiproton trap hipat Sample Search Results  

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

of - Department of Physics, Non-Neutral Plasma Project Collection: Plasma Physics and Fusion 12 Cold Trapped Positrons and Progress to Cold Antihydrogen Summary: over a wide...

319

Synergies of High-Efficiency Clean Combustion and Lean NOx Trap...  

Broader source: Energy.gov (indexed) [DOE]

Combustion and Lean NOx Trap Catalysts investigation of potential synergies of low emission advanced combustion techniques and advanced lean exhaust catalytic aftertreatment....

320

Technological assessment of light-trapping technology for thin-film Si solar cell.  

E-Print Network [OSTI]

??The proposed light trapping technology of Distributed Bragg Reflector (DBR) with Diffraction Grating (DG) and Anti-Reflection Coating (ARC) for thin film Si solar cell was (more)

Susantyoko, Rahmat Agung

2009-01-01T23:59:59.000Z

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


321

E-Print Network 3.0 - ap-8 trapped proton Sample Search Results  

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

J. Bebek, Armin Karcher, William F. Kolbe, Natalie A. Roe, Summary: Charge trap identification for proton-irradiated p+ channel CCDs Nick J. Mostek, Christopher J... , we...

322

Coherent population trapping on the sodium D1 line in high magnetic fields  

Science Journals Connector (OSTI)

We consider the coherent-population-trapping (CPT) phenomenon in a sodium atomic vapor. The experiment leading to the first observation of CPT is revisited with an improved...

Hller, R; Renzoni, F; Windholz, L; Xu, J H

1997-01-01T23:59:59.000Z

323

Nano-particle trapping by optically induced Dielectrophoresis enhanced by nano-antennas  

Science Journals Connector (OSTI)

We demonstrate experimentally trapping and manipulation of 50nm gold nanoparticles suspended in Isopropanol using dielectrophoretic (DEP) forces induced by illuminating arrays of...

Yifat, Yuval; Eitan, Michal; Scheuer, Jacob

324

E-Print Network 3.0 - aerosol trapping effect Sample Search Results  

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

of this infrared radiation is trapped... 'S TEMPERATURE IS RISING This is the greenhouse effect. Without it, the Earths climate would be ... Source: Brookhaven National...

325

Comparison of methods to quantify interface trap densities at dielectric/IIIV semiconductor interfaces  

E-Print Network [OSTI]

and a series resistance R s . ?c? Equivalent circuit of theresistance, R s . The in- terface trap density contributes an equivalent

Stemmer, Susanne

2010-01-01T23:59:59.000Z

326

QUANTUM SIMULATIONS OF THE ISING MODEL WITH TRAPPED IONS: DEVIL'S STAIRCASE AND ARBITRARY LATTICE PROPOSAL .  

E-Print Network [OSTI]

??A collection of trapped atomic ions represents one of the most attractive platforms for the quantum simulation of interacting spin networks and quantum magnetism. Spin-dependent (more)

Korenblit, Simcha

2013-01-01T23:59:59.000Z

327

Water Trapping on Tidally Locked Terrestrial Planets Requires Special Conditions  

E-Print Network [OSTI]

Surface liquid water is essential for standard planetary habitability. Calculations of atmospheric circulation on tidally locked planets around M stars suggest that this peculiar orbital configuration lends itself to the trapping of large amounts of water in kilometers-thick ice on the night side, potentially removing all liquid water from the day side where photosynthesis is possible. We study this problem using a global climate model including coupled atmosphere, ocean, land, and sea-ice components as well as a continental ice sheet model driven by the climate model output. For a waterworld we find that surface winds transport sea ice toward the day side and the ocean carries heat toward the night side. As a result, night-side sea ice remains O(10 m) thick and night-side water trapping is insignificant. If a planet has large continents on its night side, they can grow ice sheets O(1000 m) thick if the geothermal heat flux is similar to Earth's or smaller. Planets with a water complement similar to Earth's w...

Yang, Jun; Hu, Yongyun; Abbot, Dorian S

2014-01-01T23:59:59.000Z

328

Dudley Ridge, a geomorphic trap - lacustrine gas in California  

SciTech Connect (OSTI)

The Dudley Ridge gas field is about 6 mi southeast of Kettleman City, California. The abandoned field straddles the boundary between T23S, R19E, and T23S, R20E, MDBM, in Kings County, California. The Tulare Lake depression was formed during the Pleistocene. It is bounded by the Temblor Range on the west, the Sierra Nevada rise on the east, the north tilt of the San Joaquin Valley to the south, and a gentle rise in the San Joaquin Valley floor to the north. The depression is almost circular except for the west side where North Kettleman dome formed a peninsula. The prevailing longshore current was to the south due to Coriolis-directed winds. Dudley Ridge was formed as a spit, trailing south off the side of North Kettleman dome. The spit is sandy, silty clay, with sand lense onlaps. The geomorphic trap formed by the sand lenses serves as a trap for the methane gas being produced in the organic-rich lake-bed sediments.

Sugden, H.E.

1986-04-01T23:59:59.000Z

329

Auxiliary ECR heating system for the gas dynamic trap  

SciTech Connect (OSTI)

Physics aspects of a new system for electron cyclotron resonance heating (ECRH) at the magnetic mirror device Gas Dynamic Trap (GDT, Budker Institute, Novosibirsk) are discussed. This system based on two 400 kW/54.5 GHz gyrotrons is aimed at increasing the electron temperature up to the range 250-350 eV for improved energy confinement of hot ions. The key physical issue of the GDT magnetic field topology is that conventional ECRH geometries are not accessible. The proposed solution is based on a peculiar effect of radiation trapping in inhomogeneous magnetized plasma. Under specific conditions, oblique launch of gyrotron radiation results in generation of right-hand-polarized (R) electromagnetic waves propagating with high N{sub Double-Vertical-Line Double-Vertical-Line} in the vicinity of the cyclotron resonance layer, which leads to effective single-pass absorption of the injected microwave power. In the present paper, we investigate numerically an optimized ECRH scenario based on the proposed mechanism of wave propagation and discuss the design of the ECRH system, which is currently under construction at the Budker Institute.

Shalashov, A. G.; Gospodchikov, E. D.; Smolyakova, O. B.; Malygin, V. I. [Institute of Applied Physics of the Russian Academy of Sciences, Ulyanova St. 46, 603950 Nizhny Novgorod (Russian Federation); Bagryansky, P. A. [Budker Institute of Nuclear Physics of the Siberian Branch of the Russian Academy of Sciences, Akademika Lavrentieva Prospect 11, 630090 Novosibirsk (Russian Federation); Thumm, M. [Institut fuer Hochfrequenztechnik und Elektronik, Karlsruhe Institut fuer Technologie, Engesserstrasse 5, 76131 Karlsruhe (Germany)

2012-05-15T23:59:59.000Z

330

Heating of trapped ultracold atoms by collapse dynamics  

E-Print Network [OSTI]

{The Continuous Spontaneous Localization (CSL) theory alters the Schr\\"odinger equation. It describes wave function collapse as a dynamical process instead of an ill-defined postulate, thereby providing macroscopic uniqueness and solving the so-called measurement problem of standard quantum theory. CSL contains a parameter $\\lambda$ giving the collapse rate of an isolated nucleon in a superposition of two spatially separated states and, more generally, characterizing the collapse time for any physical situation. CSL is experimentally testable, since it predicts some behavior different from that predicted by standard quantum theory. One example is the narrowing of wave functions, which results in energy imparted to particles. Here we consider energy given to trapped ultra-cold atoms. Since these are the coldest samples under experimental investigation, it is worth inquiring how they are affected by the CSL heating mechanism. We examine the CSL heating of a BEC in contact with its thermal cloud. Of course, other mechanisms also provide heat and also particle loss. From varied data on optically trapped cesium BEC's, we present an energy audit for known heating and loss mechanisms. The result provides an upper limit on CSL heating and thereby an upper limit on the parameter $\\lambda$. We obtain $\\lambda\\lesssim 1(\\pm1)\\times 10^{-7}$sec$^{-1}$.}

Franck Lalo; William J. Mullin; Philip Pearle

2014-11-12T23:59:59.000Z

331

Plastic Flow in Glass  

Science Journals Connector (OSTI)

...1964 research-article Plastic Flow in Glass D. M. Marsh The classical brittle fracture...account for the mechanical properties of glasses, but the widespread evidence of plastic flow in all glass fracture phenomena even at room temperature...

1964-01-01T23:59:59.000Z

332

Ultrasonic flow metering system  

DOE Patents [OSTI]

A system for determining the density, flow velocity, and mass flow of a fluid comprising at least one sing-around circuit that determines the velocity of a signal in the fluid and that is correlatable to a database for the fluid. A system for determining flow velocity uses two of the inventive circuits with directional transmitters and receivers, one of which is set at an angle to the direction of flow that is different from the others.

Gomm, Tyler J. (Meridian, ID); Kraft, Nancy C. (Idaho Falls, ID); Mauseth, Jason A. (Pocatello, ID); Phelps, Larry D. (Pocatello, ID); Taylor, Steven C. (Idaho Falls, ID)

2002-01-01T23:59:59.000Z

333

Elbow mass flow meter  

DOE Patents [OSTI]

Elbow mass flow meter. The present invention includes a combination of an elbow pressure drop generator and a shunt-type mass flow sensor for providing an output which gives the mass flow rate of a gas that is nearly independent of the density of the gas. For air, the output is also approximately independent of humidity.

McFarland, Andrew R. (College Station, TX); Rodgers, John C. (Santa Fe, NM); Ortiz, Carlos A. (Bryan, TX); Nelson, David C. (Santa Fe, NM)

1994-01-01T23:59:59.000Z

334

A New Approach to Computing Max Flows using Electrical Flows  

E-Print Network [OSTI]

A New Approach to Computing Max Flows using Electrical Flows Yin Tat Lee (MIT) Satish Rao (UC-Kelner-Madry-Spielman-Teng'11]: approximate flow in time Uses electrical flows. 7 #12;Electrical Flows 3 1 S t 8 #12;Electrical Flows Identify Graph with Resistor Network R(e)=1/w(e) 1/3 S t 1 9 #12;Electrical Flows Electrical flow

Rajamani, Sriram K.

335

Low flow fume hood  

DOE Patents [OSTI]

A fume hood is provided having an adequate level of safety while reducing the amount of air exhausted from the hood. A displacement flow fume hood works on the principal of a displacement flow which displaces the volume currently present in the hood using a push-pull system. The displacement flow includes a plurality of air supplies which provide fresh air, preferably having laminar flow, to the fume hood. The displacement flow fume hood also includes an air exhaust which pulls air from the work chamber in a minimally turbulent manner. As the displacement flow produces a substantially consistent and minimally turbulent flow in the hood, inconsistent flow patterns associated with contaminant escape from the hood are minimized. The displacement flow fume hood largely reduces the need to exhaust large amounts of air from the hood. It has been shown that exhaust air flow reductions of up to 70% are possible without a decrease in the hood's containment performance. The fume hood also includes a number of structural adaptations which facilitate consistent and minimally turbulent flow within a fume hood.

Bell, Geoffrey C. (Pleasant Hill, CA); Feustel, Helmut E. (Albany, CA); Dickerhoff, Darryl J. (Berkeley, CA)

2002-01-01T23:59:59.000Z

336

Ion Crystals Produced by Laser and Sympathetic Cooling in a Linear RF Ion Trap  

E-Print Network [OSTI]

A detailed investigation of ion crystals produced by laser and sympathetic cooling in a linear RF trap has been conducted. The laser cooling methods were examined and applied to the trapped ^24Mg^(positive) ions. The crystals produced by the laser...

Zhu, Feng

2012-02-14T23:59:59.000Z

337

Laser Stabilization for Quantum Computing with Trapped Barium ions Corey Adams  

E-Print Network [OSTI]

Laser Stabilization for Quantum Computing with Trapped Barium ions Corey Adams University of Rochester (Dated: November 11, 2009) ABSTRACT The goal of this project was to stabilize a laser cooling system used to trap and cool Ba+ ions used for quantum computation research. The lasers, at 650 and 985

Blinov, Boris

338

ccsd00000593 Collective modes of a trapped Lieb-Liniger gas  

E-Print Network [OSTI]

ccsd­00000593 (version 1) : 11 Sep 2003 Collective modes of a trapped Lieb-Liniger gas September 11, 2003) We consider a trapped repulsive one-dimensional (1D) Bose gas at very low temperature, where the gas is locally described by the Lieb-Liniger model of bosons interacting via a repulsive delta

339

Surface-Enhanced Raman Scattering with Ag Nanoparticles Optically Trapped by a Photonic Crystal Cavity  

E-Print Network [OSTI]

on the chemical to be sensed. Figure 1a shows a schematic diagram of the trapping-assisted SERS platform we) platform by optically trapping Ag nanoparticles with a photonic crystal cavity integrated, unattended systems for the continual monitoring of chemicals in air and water. A high- performance substrate

340

Trapped-particle diocotron modes T. J. Hilsabeck and T. M. O'Neil  

E-Print Network [OSTI]

Trapped-particle diocotron modes T. J. Hilsabeck and T. M. O'Neil Department of Physics, University rate, and eigenmode structure are compared to experimental observation. The modes are excited on a non-neutral plasma column in which classes of trapped and passing particles have been created by the application

California at San Diego, University of

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


341

MATERIALS, METHODS, AND INSTRUMENTATION FOR PREPARATIVE-SCALE ISOELECTRIC TRAPPING SEPARATIONS  

E-Print Network [OSTI]

MATERIALS, METHODS, AND INSTRUMENTATION FOR PREPARATIVE- SCALE ISOELECTRIC TRAPPING SEPARATIONS A Dissertation by ROBERT YATES NORTH Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment... of the requirements for the degree of DOCTOR OF PHILOSOPHY May 2009 Major Subject: Chemistry MATERIALS, METHODS, AND INSTRUMENTATION FOR PREPARATIVE- SCALE ISOELECTRIC TRAPPING SEPARATIONS A Dissertation by ROBERT YATES NORTH...

North, Robert Yates

2011-08-08T23:59:59.000Z

342

NEUTRON LIFETIME EXPERIMENT USING UCN STORAGE IN AN `ACCORDION-LIKE' TRAP  

E-Print Network [OSTI]

NEUTRON LIFETIME EXPERIMENT USING UCN STORAGE IN AN `ACCORDION-LIKE' TRAP BY ASHISH M. DESAI determination of the neutron lifetime has an impact on particle physics and cosmology. We report progress towards a measurement of the neutron lifetime using an accordion-like storage trap. Ultracold neutrons

Steyerl, Albert

343

M4C3 precipitation in FeCMoV steels and relationship to hydrogen trapping  

E-Print Network [OSTI]

, Pembroke Street, Cambridge CB2 3QZ, UK Strong steels suffer from embrittlement due to dissolved hydrogenM4C3 precipitation in Fe­C­Mo­V steels and relationship to hydrogen trapping BY S. YAMASAKI AND H, a phenomenon which can be mitigated by trapping the hydrogen at carbide particles, where it is rendered benign

Cambridge, University of

344

Video Article A Microfluidic-based Hydrodynamic Trap for Single Particles  

E-Print Network [OSTI]

Video Article A Microfluidic-based Hydrodynamic Trap for Single Particles Eric M. Johnson). A Microfluidic-based Hydrodynamic Trap for Single Particles. JoVE. 47. http://www.jove.com/details.php?id=2517 and biology ranging from the molecular to cellular level. In this article, we introduce a new microfluidic

Schroeder, Charles

345

Trapping cold atoms using surface-grown carbon nanotubes P. G. Petrov,1,* S. Machluf,1  

E-Print Network [OSTI]

Trapping cold atoms using surface-grown carbon nanotubes P. G. Petrov,1,* S. Machluf,1 S. Younis,1 atomic clouds into magnetic traps created by single-wall carbon nanotubes grown directly onto dielectric surfaces. We show that atoms may be captured for experimen- tally sustainable nanotube currents, generating

Joselevich, Ernesto

346

Optica Applicata Vol. XXVIII, No. 3, str. 239, 1998 Magneto-Optical Trap for Rubidium Atoms  

E-Print Network [OSTI]

1 Optica Applicata Vol. XXVIII, No. 3, str. 239, 1998 Magneto-Optical Trap for Rubidium Atoms Jerzy of the lasers used in the set-up. 1. Introduction Atomic physics has noticed recently a rapid development of research on different methods of cooling and trapping of atoms with use of optical forces (light pressure

347

Cooling and Trapping Atoms Atoms are slowed and cooled by radiation pressure from laser light  

E-Print Network [OSTI]

Cooling and Trapping Atoms Atoms are slowed and cooled by radiation pressure from laser light and then trapped in a bottle whose "walls" are magnetic fields. Cooled atoms are ideal for exploring basic. research has traditionally been the study of the intrinsic prop erties of isolated atoms. In the early part

Johannesson, Henrik

348

VOLUME 6S, NUMBER 13 PHYSICAL REVIEW LETTERS Very Cold Trapped Atoms in a Vapor Cell  

E-Print Network [OSTI]

VOLUME 6S, NUMBER 13 PHYSICAL REVIEW LETTERS Very Cold Trapped Atoms in a Vapor Cell 24 SEPTEMBER sample of spin-polarized trapped atoms. The technique used dramati- cally simplifies the production of laser-cooled atoms. In this experiment, 1.8x10' neutral cesium atoms were optically captured directly

Monroe, Christopher

349

Cooling and Heating of the Quantum Motion of Trapped Cd+ Louis Deslauriers  

E-Print Network [OSTI]

of fluctuating electric fields with the motional state of the ion leads to heating and thus to decoherence of decoherence in ion traps and possibly other charge-based quantum systems. #12;Cooling and HeatingABSTRACT Cooling and Heating of the Quantum Motion of Trapped Cd+ Ions by Louis Deslauriers Chair

Monroe, Christopher

350

Trapping of ultracold atoms in a hollow-core photonic crystal fiber Caleb A. Christensen,1  

E-Print Network [OSTI]

light in multiple modes in the cladding or core. Such fibers are susceptible to speckle or inhomogeneous have succeeded in trapping ultracold atoms 13 or guiding thermal 14 or laser-cooled atoms 15 through laser cooling and rf evaporation in a dc Ioffe-Pritchard magnetic trap, then load the BEC into a red

351

The trapped-particle instability in the Boeing 1kW FEL oscillator  

SciTech Connect (OSTI)

The new design for the Boeing High Average Power Free Electron Laser will operate at 1KW average power (0.63 {mu}m) with a peak current of 132A. Simulations are used to investigate the trapped-particle instability and diffraction effects. Incorporating large desynchronism may prove to be a useful method of controlling the trapped-particle instability.

Ramos, L.; Blau, J.; Colson, W.B. [Naval Postgraduate School, Monterey, CA (United States)

1995-12-31T23:59:59.000Z

352

Oscillating Magnetic Trap and Non-Thermal Emission from Solar Flares  

Science Journals Connector (OSTI)

......connected with the electron thermal conductivity and ion viscosity...1, ed. Galeev A. A., Sudan R. N. (North-Holland Physics...Oscillating Magnetic Trap and Non-Thermal Emission from Solar Flares...scattering of trapped non-thermal electrons (Aschwanden et al......

Yuri Tsap; Yulia Kopylova; Tatiana Goldvarg; Alexander Stepanov

2013-12-05T23:59:59.000Z

353

Ground state cooling, quantum state engineering and study of decoherence of ions in Paul traps  

E-Print Network [OSTI]

Ground state cooling, quantum state engineering and study of decoherence of ions in Paul traps F March 2000; revision received 23 June 2000) Abstract. We investigate single ions of 40 Ca in Paul traps for the manipulation of the ion' s quantum state. We apply sideband cooling to the ion and reach the ground state

Blatt, Rainer

354

Fundamental limit of light trapping in grating Zongfu Yu, Aaswath Raman and Shanhui Fan+  

E-Print Network [OSTI]

­305 (1982). 5. M. A. Green, "Lambertian light trapping in textured solar cells and light-emitting diodes. I. Tobías, A. Luque, and A. Marti, "Light intensity enhancement by diffracting structures in solar of nanophotonic light trapping for solar cells," arXiv:1004.2902v2 [physics.optics] (2010). http

Fan, Shanhui

355

Silicon Solar Cell Light-Trapping Using Defect Mode Photonic Kelsey A. Whitesell*a  

E-Print Network [OSTI]

Silicon Solar Cell Light-Trapping Using Defect Mode Photonic Crystals Kelsey A. Whitesell to enhance performance of thin film solar cells because of their unique ability to control light. We show for light trapping in thin film photovoltaics. Keywords: photonic crystals, defect, silicon, solar cell

Atwater, Harry

356

Light Trapping Textures Designed by Electromagnetic Optimization for Sub-Wavelength Thick Solar Cells  

E-Print Network [OSTI]

Light Trapping Textures Designed by Electromagnetic Optimization for Sub-Wavelength Thick Solar Sciences Division, Lawrence Berkeley National Laboratory July 23, 2013 Abstract Light trapping in solar the surface of the solar cell, where n is the material refractive index. This ray-optics absorption

California at Irvine, University of

357

Light trapping design for low band-gap polymer solar cells  

E-Print Network [OSTI]

Light trapping design for low band-gap polymer solar cells Stephen Foster1,* and Sajeev John1,2 1 demonstrate numerically a 2-D nanostructured design for light trapping in a low band-gap polymer solar cell, "Light harvesting improvement of organic solar cells with self- enhanced active layer designs," Opt

John, Sajeev

358

3D modeling of magnetic atom traps on type-II superconductor chips  

E-Print Network [OSTI]

Israel 2 A. Yersin Department of Solar Energy and Environmental Physics, The Blaustein Institutes. The proposed approach allows us to predict important characteristics of the magnetic traps (their depth, shape, and in the usage of trapped atoms to probe local irregularities of magnetic and electric fields near conductive

Prigozhin, Leonid

359

Optical diagnostics of cold (I'mK atoms in the magneto-optical trap  

E-Print Network [OSTI]

Optical diagnostics of cold (I'mK atoms in the magneto-optical trap Tomasz M. Brzozowski, Witold with the spectroscopic methods. In this paper, we present basic principles ofobtaining ultra-cold atoms and methods used-OFHCAL TRAP Temperatures of atoms in gaseous phase below 1 mK are nowadays routinely reached with the help

360

NREL experiments show that disordered inverse opals significantly scatter and trap near-infrared light, with  

E-Print Network [OSTI]

NREL experiments show that disordered inverse opals significantly scatter and trap near-infrared wavelengths in the near-infrared (NIR), which is important to a number of technologies. This discovery.neale@nrel.gov Reference: N.R. Neale, B.G. Lee, S.H. Kang, and A.J. Frank."Near-Infrared Light Trapping in Disordered

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


361

Title of dissertation: QUANTUM SIMULATIONS OF THE ISING MODEL WITH TRAPPED IONS  

E-Print Network [OSTI]

are intractable. #12;QUANTUM SIMULATIONS OF THE ISING MODEL WITH TRAPPED IONS: DEVIL'S STAIRCASE AND ARBITRARYABSTRACT Title of dissertation: QUANTUM SIMULATIONS OF THE ISING MODEL WITH TRAPPED IONS: DEVIL'S STAIRCASE AND ARBITRARY LATTICE PROPOSAL Simcha Korenblit, Doctor of Philosophy 2013 Dissertation directed

Monroe, Christopher

362

Light traps are one of a number of different gears used to sample  

E-Print Network [OSTI]

phases, current speed or water Effects of current speed and turbidity on stationary light-trap catches measurements of cur- rent speed and turbidity. Materials and methods Study sites Larval and juvenile fishes438 Light traps are one of a number of different gears used to sample pelagic larval and juvenile

363

Steven Chu: Laser Cooling and Trapping of Atoms  

Office of Scientific and Technical Information (OSTI)

Steven Chu Steven Chu Laser Cooling and Trapping of Atoms Resources with Additional Information · Interviews, Speeches, and Presentations · Patents Steven Chu Photo Credit: Lawrence Berkeley National Laboratory Roy Kaltschmidt, Photographer Steven Chu was appointed by President Barack Obama to be the 12th Secretary of Energy and served in this capacity until April 22, 2013. He was previously Director of Lawrence Berkeley National Laboratory (LBNL), Professor in the Physics Department at the University of California, Berkeley, and 'the Theodore and Frances Geballe Professor of Physics and Applied Physics at Stanford University. Professor Chu's research is in atomic physics, polymer and biophysics. His thesis and postdoctoral work at Berkeley ... was the observation of parity non-conservation in atomic transitions in 1978. This experiment was one of the earliest atomic physics confirmations of the Weinberg-Salam-Glashow theory that unifies the weak and electromagnetic forces.

364

Steven Chu: Laser Cooling and Trapping of Atoms  

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

Steven Chu Steven Chu Laser Cooling and Trapping of Atoms Resources with Additional Information · Interviews, Speeches, and Presentations · Patents Steven Chu Photo Credit: Lawrence Berkeley National Laboratory Roy Kaltschmidt, Photographer Steven Chu was appointed by President Barack Obama to be the 12th Secretary of Energy and served in this capacity until April 22, 2013. He was previously Director of Lawrence Berkeley National Laboratory (LBNL), Professor in the Physics Department at the University of California, Berkeley, and 'the Theodore and Frances Geballe Professor of Physics and Applied Physics at Stanford University. Professor Chu's research is in atomic physics, polymer and biophysics. His thesis and postdoctoral work at Berkeley ... was the observation of parity non-conservation in atomic transitions in 1978. This experiment was one of the earliest atomic physics confirmations of the Weinberg-Salam-Glashow theory that unifies the weak and electromagnetic forces.

365

Laser cooling of a trapped particle with increased Rabi frequencies  

E-Print Network [OSTI]

This paper analyses the cooling of a single particle in a harmonic trap with red-detuned laser light with fewer approximations than previously done in the literature. We avoid the adiabatic elimination of the excited atomic state but are still interested in Lamb-Dicke parameters $\\eta \\ll 1$. Our results show that the Rabi frequency of the cooling laser can be chosen higher than previously assumed, thereby increasing the effective cooling rate but {\\em not} affecting the final outcome of the cooling process. Since laser cooling is already a well established experimental technique, the main aim of this paper is to present a model which can be extended to more complex scenarios, like cavity-mediated laser cooling.

Tony Blake; Andreas Kurcz; Norah S. Saleem; Almut Beige

2011-10-14T23:59:59.000Z

366

Subwavelength edge detection through trapped resonances in waveguides  

E-Print Network [OSTI]

Lenses that can collect the perfect image of an object must restore propagative and evanescent waves. However, for efficient information transfer, e.g., in compressed sensing, it is often desirable to detect only the fast spatial variations of the wave field (carried by evanescent waves), as the one created by edges or small details. Image processing edge detection algorithms perform such operation but they add time and complexity to the imaging process. Here, we present a new subwavelength approach that generates an image of only those components of the acoustic field that are equal to or smaller than the operating wavelength. The proposed technique converts evanescent waves into propagative waves exciting trapped resonances in a waveguide, and it uses periodicity to attenuate the propagative components. This approach achieves resolutions about an order of magnitude smaller than the operating wavelength and makes it possible to visualize independently edges aligned along different directions.

Molern, Miguel

2015-01-01T23:59:59.000Z

367

Hydrogen trapping in ?-Pu: insights from electronic structure calculations  

Science Journals Connector (OSTI)

Density functional theory calculations have been performed to provide details of the structural and charge-transfer details related to the solid solution of hydrogen in (?)-plutonium. We follow the Flanagan model that outlines the process by which hydrogen interacts with a metal to produce hydride phases, via a sequence of surface, interstitial and defect-bound (trapped) states. Due to the complexities of the electronic structure in plutonium solid-state systems, we take the pragmatic approach of adopting the 'special quasirandom structure' to disperse the atomic magnetic moments. We find that this approach produces sound structural and thermodynamic properties in agreement with the available experimental data. In ?-Pu, hydrogen has an exothermic binding energy to all of the states relevant in the Flanagan model, and, furthermore, is anionic in all these states. The charge transfer is maximized (i.e.most negative for hydrogen) in the hydride phase. The pathway from surface to hydride is sequentially exothermic, in the order surface

Christopher D Taylor; Sarah C Hernandez; Michael F Francis; Daniel S Schwartz; Asok K Ray

2013-01-01T23:59:59.000Z

368

Theory of indirect exciton photoluminescence in elevated quantum trap  

Science Journals Connector (OSTI)

Abstract Inspired by an experiment of indirect excitons photoluminescence (PL) in elevated quantum trap (High et al., 2009), we theoretically investigate the energy relaxation and nonlinear interactions of indirect excitons in coupled quantum wells. It is shown that, when increasing the laser power, the intensity reversion of two PL peaks is due to the phonon necklace effect. In addition, we use a nonlinear Schrdinger equation including attractive two-body, repulsive three-body interactions and the excitation power dependence of energy distribution to understand the exciton states. This model gives a natural account for the PL blue shift with the increase of the excitation power. This study thus provides an alternative way to understand the underlying physics of the exciton dynamics in coupled potential wells.

C.S. Liu; T.F. Xu; Y.H. Liu; X.L. Jing

2014-01-01T23:59:59.000Z

369

Nuclear spin cooling using Overhauser field selective coherent population trapping  

E-Print Network [OSTI]

Hyperfine interactions with a nuclear spin environment fundamentally limit the coherence properties of confined electron spins in the solid-state. Here, we show that a quantum interference effect in optical absorption from two electronic spin states of a solid-state emitter can be used to prepare the surrounding environment of nuclear spins in well-defined states, thereby suppressing electronic spin dephasing. The evolution of the coupled electron-nuclei system into a coherent population trapping state by optical excitation induced nuclear spin diffusion can be described in terms of Levy flights, in close analogy with sub-recoil laser cooling of atoms. The large difference in electronic and nuclear time scales simultaneously allow for a measurement of the magnetic field produced by nuclear spins, making it possible to turn the lasers that cause the anomalous spin diffusion process off when the strength of the resonance fluorescence reveals that the nuclear spins are in the desired narrow state.

Mena Issler; Eric Kessler; Geza Giedke; Susanne Yelin; Ignacio Cirac; Mikhail Lukin; Atac Imamoglu

2010-08-20T23:59:59.000Z

370

Lean Gasoline Engine Reductant Chemistry During Lean NOx Trap Regeneration  

SciTech Connect (OSTI)

Lean NOx Trap (LNT) catalysts can effectively reduce NOx from lean engine exhaust. Significant research for LNTs in diesel engine applications has been performed and has led to commercialization of the technology. For lean gasoline engine applications, advanced direct injection engines have led to a renewed interest in the potential for lean gasoline vehicles and, thereby, a renewed demand for lean NOx control. To understand the gasoline-based reductant chemistry during regeneration, a BMW lean gasoline vehicle has been studied on a chassis dynamometer. Exhaust samples were collected and analyzed for key reductant species such as H2, CO, NH3, and hydrocarbons during transient drive cycles. The relation of the reductant species to LNT performance will be discussed. Furthermore, the challenges of NOx storage in the lean gasoline application are reviewed.

Choi, Jae-Soon [ORNL] [ORNL; Prikhodko, Vitaly Y [ORNL] [ORNL; Partridge Jr, William P [ORNL] [ORNL; Parks, II, James E [ORNL; Norman, Kevin M [ORNL] [ORNL; Huff, Shean P [ORNL] [ORNL; Chambon, Paul H [ORNL] [ORNL; Thomas, John F [ORNL] [ORNL

2010-01-01T23:59:59.000Z

371

FLOW CONDITIONING DESIGN IN TURBULENT  

E-Print Network [OSTI]

for HYLIFE-II · Measure loss coefficient across the flow conditioner / nozzle assembly for different flow conditioner configurations #12;5 Flow Loop A Pump H 400 gal tank B Bypass line I Butterfly valve C Flow meter

372

Penning traps with unitary architecture for storage of highly charged ions  

E-Print Network [OSTI]

Penning traps are made extremely compact by embedding rare-earth permanent magnets in the electrode structure. Axially-oriented NdFeB magnets are used in unitary architectures that couple the electric and magnetic components into an integrated structure. We have constructed a two- magnet Penning trap with radial access to enable the use of laser or atomic beams, as well as the collection of light. An experimental apparatus equipped with ion optics is installed at the NIST electron beam ion trap (EBIT) facility, constrained to fit within 1 meter at the end of a horizontal beamline for transporting highly charged ions. Highly charged ions of neon and argon, extracted with initial energies up to 4000 eV per unit charge, are captured and stored to study the confinement properties of a one-magnet trap and a two-magnet trap. Design considerations and some test results are discussed.

Tan, Joseph N; Guise, Nicholas D; 10.1063/1.3685246

2012-01-01T23:59:59.000Z

373

Noise and microresonance of critical current in Josephson junction induced by Kondo trap states  

E-Print Network [OSTI]

We analyze the impact of trap states in the oxide layer of a superconducting tunnel junctions, on the fluctuation of the Josephson critical current, thus on coherence in superconducting qubits. Two mechanisms are usually considered: the current blockage due to repulsion at the occupied trap states, and the noise from electrons hopping across a trap. We extend previous studies of noninteracting traps to the case where the traps have on-site electron repulsion inside one ballistic channel. The repulsion not only allows the appropriate temperature dependence of 1/f noise, but also is a control to the coupling between the computational qubit and the spurious two-level systems inside the oxide dielectric. We use second order perturbation theory which allows to obtain analytical formulae for the interacting bound states and spectral weights, limited to small and intermediate repulsions. Remarkably, it still reproduces the main features of the model as identified from the Numerical Renormalization Group. We present ...

Ansari, Mohammad H

2011-01-01T23:59:59.000Z

374

Adiabatic electron response and solitary wave generation by trapped particle nonlinearity in a hydrogen plasma  

SciTech Connect (OSTI)

The finite amplitude ion acoustic waves that trap electrons modify the structure of the evolving nonlinear soliton solutions. In the numerical simulations, self-consistently generated solitary waves are studied that emerge as a result of a current driven microinstability growing the ion acoustic mode in a collisionless Vlasov plasma. The growth saturates as a result of nonlinear effects governed by a combination of nonlinearities originating from the hydrodynamic model and kinetic particle trapping effects. The resulting solitary waves also coexist with a finite current and an electron plasma wave capable of perturbing the trapping potential. The results of multiscale simulation are analyzed and characterized following the kinetic prescription of undamped trapped particle mode in the form of phase space vortex solutions that are generalized form of Sagdeev's solitons and obey the solutions of a modified Korteweg-de Vries equation, accounting for a stronger nonlinearity originating from the electron trapping.

Mandal, Debraj; Sharma, Devendra [Institute for Plasma Research, Bhat, Gandhinagar 382428 (India)

2014-10-15T23:59:59.000Z

375

Accuracy estimations of overtone vibrational transition frequencies of optically trapped 174Yb6Li molecules  

Science Journals Connector (OSTI)

The attainable accuracy of the X2?(v,N)=(0,0)?(vu,0) transition frequencies of optically trapped 174Yb6Li molecules are analyzed (vu=1,2,3,4) to test the variation in the proton-to-electron mass ratio. We eliminate the Stark shifts induced by the trap and Raman lasers by choosing appropriate frequencies (magic frequencies). For vu=1 and 2, we obtain more than one experimentally useful magic frequency, thereby leading to more choice in the trap laser. For vu=3 and 4, the choice in the trap laser is limited. The systematic frequency uncertainty is given by the trap laser frequency detuning from the magic frequency and the fluctuation of the power ratio of the two Raman lasers and can be lower than 10?16 for all these transition frequencies. To obtain lower statistical uncertainty, measurement with vu=4 is more advantageous than that with vu=1?3.

Masatoshi Kajita; Geetha Gopakumar; Minori Abe; Masahiko Hada

2012-06-28T23:59:59.000Z

376

Hybrid particle traps and conditioning procedure for gas insulated transmission lines  

DOE Patents [OSTI]

A gas insulated transmission line includes an outer sheath, an inner condor within the outer sheath, insulating supports supporting the inner conductor within the outer sheath, and an insulating gas electrically insulating the inner conductor from the outer sheath. An apertured particle trapping ring is disposed within the outer sheath, and the trapping ring has a pair of dielectric members secured at each longitudinal end thereof, with the dielectric members extending outwardly from the trapping ring along an arc. A support sheet having an adhesive coating thereon is secured to the trapping ring and disposed on the outer sheath within the low field region formed between the trapping ring and the outer sheath. A conditioning method used to condition the transmission line prior to activation in service comprises applying an AC voltage to the inner conductor in a plurality of voltage-time steps, with the voltage-time steps increasing in voltage magnitude while decreasing in time duration.

Dale, Steinar J. (Monroeville, PA); Cookson, Alan H. (Churchill, PA)

1982-01-01T23:59:59.000Z

377

High-k shallow traps observed by charge pumping with varying discharging times  

SciTech Connect (OSTI)

In this paper, we investigate the influence of falling time and base level time on high-k bulk shallow traps measured by charge pumping technique in n-channel metal-oxide-semiconductor field-effect transistors with HfO{sub 2}/metal gate stacks. N{sub T}-V{sub high} {sub level} characteristic curves with different duty ratios indicate that the electron detrapping time dominates the value of N{sub T} for extra contribution of I{sub cp} traps. N{sub T} is the number of traps, and I{sub cp} is charge pumping current. By fitting discharge formula at different temperatures, the results show that extra contribution of I{sub cp} traps at high voltage are in fact high-k bulk shallow traps. This is also verified through a comparison of different interlayer thicknesses and different Ti{sub x}N{sub 1?x} metal gate concentrations. Next, N{sub T}-V{sub high} {sub level} characteristic curves with different falling times (t{sub falling} {sub time}) and base level times (t{sub base} {sub level}) show that extra contribution of I{sub cp} traps decrease with an increase in t{sub falling} {sub time}. By fitting discharge formula for different t{sub falling} {sub time}, the results show that electrons trapped in high-k bulk shallow traps first discharge to the channel and then to source and drain during t{sub falling} {sub time}. This current cannot be measured by the charge pumping technique. Subsequent measurements of N{sub T} by charge pumping technique at t{sub base} {sub level} reveal a remainder of electrons trapped in high-k bulk shallow traps.

Ho, Szu-Han; Chen, Ching-En; Tseng, Tseung-Yuen [Department of Electronics Engineering, National Chiao Tung University, Hsinchu 300, Taiwan (China); Chang, Ting-Chang, E-mail: tcchang@mail.phys.nsysu.edu.tw [Department of Physics, National Sun Yat-Sen University, Kaohsiung 804, Taiwan (China); Advanced Optoelectronics Technology Center, National Cheng Kung University, Tainan, Taiwan (China); Lu, Ying-Hsin; Lo, Wen-Hung; Tsai, Jyun-Yu; Liu, Kuan-Ju [Department of Physics, National Sun Yat-Sen University, Kaohsiung 804, Taiwan (China); Wang, Bin-Wei; Cao, Xi-Xin [Department of Embedded System Engineering, Peking University, Beijing, P.R.China (China); Chen, Hua-Mao [Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu, Taiwan (China); Cheng, Osbert; Huang, Cheng-Tung; Chen, Tsai-Fu [Device Department, United Microelectronics Corporation, Tainan Science Park, Taiwan (China)

2013-11-07T23:59:59.000Z

378

PhD position in trapped ion quantum technology and nanoscience at the University of Sussex, Brighton, UK  

E-Print Network [OSTI]

PhD position in trapped ion quantum technology and nanoscience at the University of Sussex a quantum computer with trapped ions. Research in the group focuses on the borderland of nanoscience

Hensinger, Winfried

379

Comparison of Ag and SiO2 Nanoparticles for Light Trapping Applications in Silicon Thin Film Solar Cells  

Science Journals Connector (OSTI)

Comparison of Ag and SiO2 Nanoparticles for Light Trapping Applications in Silicon Thin Film Solar Cells ... Department

Martin Theuring; Peng Hui Wang; Martin Vehse; Volker Steenhoff; Karsten von Maydell; Carsten Agert; Alexandre G. Brolo

2014-09-10T23:59:59.000Z

380

Flow-induced vibration of component cooling water heat exchangers  

SciTech Connect (OSTI)

This paper presents an evaluation of flow-induced vibration problems of component cooling water heat exchangers in one of Taipower's nuclear power stations. Specifically, it describes flow-induced vibration phenomena, tests to identify the excitation mechanisms, measurement of response characteristics, analyses to predict tube response and wear, various design alterations, and modifications of the original design. Several unique features associated with the heat exchangers are demonstrated, including energy-trapping modes, existence of tube-support-plate (TSP)-inactive modes, and fluidelastic instability of TSP-active and -inactive modes. On the basis of this evaluation, the difficulties and future research needs for the evaluation of heat exchangers are identified. 11 refs., 19 figs., 3 tabs.

Yeh, Y.S.; Chen, S.S. (Taiwan Power Co., Taipei (Taiwan). Nuclear Engineering Dept.; Argonne National Lab., IL (USA))

1990-01-01T23:59:59.000Z

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


381

Turbulent flow in graphene  

E-Print Network [OSTI]

We demonstrate the possibility of a turbulent flow of electrons in graphene in the hydrodynamic region, by calculating the corresponding turbulent probability density function. This is used to calculate the contribution of the turbulent flow to the conductivity within a quantum Boltzmann approach. The dependence of the conductivity on the system parameters arising from the turbulent flow is very different from that due to scattering.

Kumar S. Gupta; Siddhartha Sen

2009-11-03T23:59:59.000Z

382

Insensitivity of the rate of ion motional heating to trap-electrode material over a large temperature range  

E-Print Network [OSTI]

We present measurements of trapped-ion motional-state heating rates in niobium and gold surface-electrode ion traps over a range of trap-electrode temperatures from approximately 4 K to room temperature (295 K) in a single ...

Chiaverini, John

383

Muffler Theory Considering Flow  

Science Journals Connector (OSTI)

The effect of a steady subsonic flow component upon the acoustical properties of pipes and of laminar and turbulent flow resistances is accounted for in an elementary fashion. The effect of the alternating or acoustic component upon the steady?flow properties is treated likewise. Acoustic transmission loss referred to the end radiation from a pipe is related to back pressure (increase in steady pressure due to the muffler). Equivalent circuits and diagrams of transmission loss vs back pressure are presented for some simple arrangements of pipes volumes irises and flow resistances.

Ewald Eichler

1962-01-01T23:59:59.000Z

384

Bose-Einstein condensation in dark power-law laser traps  

SciTech Connect (OSTI)

We investigate theoretically an original route to achieve Bose-Einstein condensation using dark power-law laser traps. We propose to create such traps with two crossing blue-detuned Laguerre-Gaussian optical beams. Controlling their azimuthal order l allows for the exploration of a multitude of power-law trapping situations in one, two, and three dimensions, ranging from the usual harmonic trap to an almost square-well potential, in which a quasihomogeneous Bose gas can be formed. The usual cigar-shaped and disk-shaped Bose-Einstein condensates obtained in a 1D or 2D harmonic trap take the generic form of a 'finger' or of a 'hockey puck' in such Laguerre-Gaussian traps. In addition, for a fixed atom number, higher transition temperatures are obtained in such configurations when compared with a harmonic trap of the same volume. This effect, which results in a substantial acceleration of the condensation dynamics, requires a better but still reasonable focusing of the Laguerre-Gaussian beams.

Jaouadi, A. [Universite Paris-Sud, Institut des Sciences Moleculaires d'Orsay (ISMO), F-91405 Orsay (France); CNRS, Orsay, F-91405 France (France); Laboratoire de Spectroscopie Atomique, Moleculaire et Applications (LSAMA), Department of Physics, Faculty of Science of Tunis, University of Tunis El Manar, T-2092 Tunis (Tunisia); Gaaloul, N. [Institut fuer Quantenoptik, Welfengarten 1, Gottfried Wilhelm Leibniz Universitaet, D-30167 Hannover (Germany); Viaris de Lesegno, B.; Pruvost, L. [CNRS, Laboratoire Aime Cotton (LAC), F-91405 Orsay (France); Universite Paris-Sud, Orsay, F-91405 France (France); Telmini, M. [Laboratoire de Spectroscopie Atomique, Moleculaire et Applications (LSAMA), Department of Physics, Faculty of Science of Tunis, University of Tunis El Manar, T-2092 Tunis (Tunisia); Charron, E. [Universite Paris-Sud, Institut des Sciences Moleculaires d'Orsay (ISMO), F-91405 Orsay (France); CNRS, Orsay, F-91405 (France)

2010-08-15T23:59:59.000Z

385

Confinement in a cryogenic penning trap of highest charge state ions from EBIT  

SciTech Connect (OSTI)

The retrapping of highly charged Xe[sup 44+] and Th[sup 68+,72+] ions extracted from an electron-beam ion trap'' (EBIT) is demonstrated after injection of the ions into RETRAP, a cryogenic Penning trap (up to 6 T magnetic field) currently with an open cylinder design. Ion extraction in a short pulse (5--20 [mu]s) from EBIT, essential for efficient retrapping, is employed. The ions are slowed down upon entering a deceleration tube mounted above the trap within the magnetic field. The potential is then rapidly (100 ns) decreased, enabling low-energy ions to enter the trap. Capture efficiencies up to 25% are observed via detection of the delayed ion release pulse with a detector below the trap. Signal voltages induced in a tuned circuit due to single and multiple ions have been observed by tuning the ion resonant axial oscillation frequencies for different ions. Results from transporting and retrapping of the ions, as well as their detection, are described and the trapping efficiency is discussed. The motivation for these studies is to cool the trapped very highly charged ions to low temperatures ([lt]4 K) in order to perform ultrahigh-resolution precision spectroscopy, collision studies at ultralow energies, and to observe phase transitions in Coulomb clusters of highly charged ions.

Schneider, D.; Church, D.A.; Weinberg, G.; Steiger, J.; Beck, B.; McDonald, J.; Magee, E.; Knapp, D. (Lawrence Livermore National Laboratory, Livermore, California 94550 (United States))

1994-11-01T23:59:59.000Z

386

Rare-earth neutral metal injection into an electron beam ion trap plasma  

SciTech Connect (OSTI)

We have designed and implemented a neutral metal vapor injector on the SuperEBIT high-energy electron beam ion trap at the Lawrence Livermore National Laboratory. A horizontally directed vapor of a europium metal is created using a thermal evaporation technique. The metal vapor is then spatially collimated prior to injection into the trap. The source's form and quantity constraints are significantly reduced making plasmas out of metal with vapor pressures ?10{sup ?7} Torr at ?1000?C more obtainable. A long pulsed or constant feed metal vapor injection method adds new flexibility by varying the timing of injection and rate of material being introduced into the trap.

Magee, E. W., E-mail: magee1@llnl.gov; Beiersdorfer, P.; Brown, G. V. [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States); Hell, N. [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States); Dr. Remeis-Sternwarte and ECAP, Universitt Erlangen-Nrnberg, 96049 Bamberg (Germany)

2014-11-15T23:59:59.000Z

387

Canonical transformation for trapped/passing guiding-center orbits in axisymmetric tokamak geometry  

E-Print Network [OSTI]

The generating function for the canonical transformation from the parallel canonical coordinates $(p_{\\|},s)$ to the action-angle coordinates $(J,\\zeta)$ for trapped/passing guiding-center orbits in axisymmetric tokamak geometry is presented. Drawing on the analogy between the phase-space portraits of the librating/rotating pendulum and the trapped/passing guiding-center orbits, the generating function is expressed in terms of the Jacobi zeta function, which can then readily be used to obtain an explicit expression for the bounce-center transformation for trapped-particles in axisymmetric tokamak geometry.

Brizard, Alain J

2014-01-01T23:59:59.000Z

388

Temperature-Driven Structural Phase Transition for Trapped Ions and a Proposal for its Experimental Detection  

SciTech Connect (OSTI)

A Wigner crystal formed with trapped ions can undergo a structural phase transition, which is determined only by the mechanical conditions on a classical level. Instead of this classical result, we show that through consideration of quantum and thermal fluctuation, a structural phase transition can be driven solely by a change in the system's temperature. We determine a finite-temperature phase diagram for trapped ions using the renormalization group method and the path integral formalism, and propose an experimental scheme to observe the predicted temperature-driven structural phase transition, which is well within the reach of the current ion trap technology.

Gong Zhexuan; Lin, G.-D.; Duan, L.-M. [Department of Physics and MCTP, University of Michigan, Ann Arbor, Michigan 48109 (United States)

2010-12-31T23:59:59.000Z

389

Temperature-Driven Structural Phase Transition for Trapped Ions and a Proposal for its Experimental Detection  

Science Journals Connector (OSTI)

A Wigner crystal formed with trapped ions can undergo a structural phase transition, which is determined only by the mechanical conditions on a classical level. Instead of this classical result, we show that through consideration of quantum and thermal fluctuation, a structural phase transition can be driven solely by a change in the systems temperature. We determine a finite-temperature phase diagram for trapped ions using the renormalization group method and the path integral formalism, and propose an experimental scheme to observe the predicted temperature-driven structural phase transition, which is well within the reach of the current ion trap technology.

Zhe-Xuan Gong; G.-D. Lin; L.-M. Duan

2010-12-29T23:59:59.000Z

390

Temperature driven structural phase transition for trapped ions and its experimental detection  

E-Print Network [OSTI]

A Wigner crystal formed with trapped ion can undergo structural phase transition, which is determined only by the mechanical conditions on a classical level. Instead of this classical result, we show that through consideration of quantum and thermal fluctuation, a structural phase transition can be solely driven by change of the system's temperature. We determine a finite-temperature phase diagram for trapped ions using the renormalization group method and the path integral formalism, and propose an experimental scheme to observe the predicted temperature-driven structural phase transition, which is well within the reach of the current ion trap technology.

Zhe-Xuan Gong; G. -D. Lin; L. -M. Duan

2010-09-01T23:59:59.000Z

391

Photoionization rates of Cs Rydberg atoms in a 1064-nm far-off-resonance trap  

SciTech Connect (OSTI)

Experimental measurements of photoionization rates of nD{sub 5/2} Rydberg states of Cs (50{<=}n{<=}75) in a 1064-nm far off-resonance dipole trap are presented. The photoionization rates are obtained by measuring the lifetimes of Rydberg atoms produced inside of a 1064-nm far off-resonance trap and comparing the lifetimes to corresponding control experiments in a magneto-optical trap. Experimental results for the control experiments agree with recent theoretical predictions for Rydberg state lifetimes and measured photoionization rates are in agreement with transition rates calculated from a model potential.

Tallant, J.; Booth, D.; Shaffer, J. P. [Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, 440 West Brooks Street, Norman, Oklahoma 73019 (United States)

2010-12-15T23:59:59.000Z

392

MoO3 trapping layers with CF4 plasma treatment in flash memory applications  

Science Journals Connector (OSTI)

Abstract In this research, we used MoO3 with CF4 plasma treatment as charge trapping layer in metal-oxide-high-k -oxide-Si-type memory. We analyzed material properties and electrical characteristics with multiple analyses. The plasma treatment could increase the trapping density, reduce the leakage current, expand band gap, and passivate the defect to enhance the memory performance. The MoO3 charge trapping layer memory with suitable CF4 plasma treatment is promising for future nonvolatile memory applications.

Chuyan Haur Kao; Hsiang Chen; Su-Zhien Chen; Chian Yu Chen; Kuang-Yu Lo; Chun Han Lin

2014-01-01T23:59:59.000Z

393

2-photon ionization and necessary laser and vacuum systems for experiments with trapped strontium ions  

E-Print Network [OSTI]

We describe a efficient way to photoionize strontium atoms in a linear radio-frequency trap. We use a 2-photon second order process to excite the autoionization resonance (4d2 + 5p2) 1D2. A doubled pulsed Ti:Saphire laser system is used at 431nm to provide 100fsec pulses at 82Mhz. The fabrication of the laser systems for addressing the Sr+ transitions necessary for laser cooling and excitation of quantum jumps, vacuum system and ion trap structure are also described in detail. With the current setup a easy and repeatable trapping of linear ion chains is achieved at UHV pressures.

E. Kirilov; S. Putterman

2007-12-03T23:59:59.000Z

394

Light Trapping for Thin Silicon Solar Cells by Femtosecond Laser Texturing: Preprint  

SciTech Connect (OSTI)

Femtosecond laser texturing is used to create nano- to micron-scale surface roughness that strongly enhances light-trapping in thin crystalline silicon solar cells. Light trapping is crucial for thin solar cells where a single light-pass through the absorber is insufficient to capture the weakly absorbed red and near-infrared photons, especially with an indirect-gap semiconductor absorber layer such as crystalline Si which is less than 20 um thick. We achieve enhancement of the optical absorption from light-trapping that approaches the Yablonovitch limit.

Lee, B. G.; Lin, Y. T.; Sher, M. J.; Mazur, E.; Branz, H. M.

2012-06-01T23:59:59.000Z

395

Optical trapping and rotation of airborne absorbing particles with a single focused laser beam  

SciTech Connect (OSTI)

We measure the periodic circular motion of single absorbing aerosol particles that are optically trapped with a single focused Gaussian beam and rotate around the laser propagation direction. The scattered light from the trapped particle is observed to be directional and change periodically at 0.420?kHz. The instantaneous positions of the moving particle within a rotation period are measured by a high-speed imaging technique using a charge coupled device camera and a repetitively pulsed light-emitting diode illumination. The centripetal acceleration of the trapped particle as high as ?20 times the gravitational acceleration is observed and is attributed to the photophoretic forces.

Lin, Jinda; Li, Yong-qing, E-mail: liy@ecu.edu [Department of Physics, East Carolina University, Greenville, North Carolina 27858-4353 (United States)] [Department of Physics, East Carolina University, Greenville, North Carolina 27858-4353 (United States)

2014-03-10T23:59:59.000Z

396

Biexciton emission from single isoelectronic traps formed by nitrogen-nitrogen pairs in GaAs  

SciTech Connect (OSTI)

We have studied photoluminescence (PL) from individual isoelectronic traps formed by nitrogen-nitrogen (NN) pairs in GaAs. Sharp emission lines due to exciton and biexciton were observed from individual isoelectronic traps in nitrogen atomic-layer doped (ALD) GaAs. The binding energy of biexciton bound to individual isoelectronic traps was approximately 8 meV. Both the exciton and biexciton luminescence lines show completely random polarization and no fine-structure splitting. These results are desirable to the application to the quantum cryptography used in the field of quantum information technology.

Takamiya, Kengo; Fukushima, Toshiyuki; Yagi, Shuhei; Hijikata, Yasuto; Yaguchi, Hiroyuki [Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura-ku , Saitama 338-8570 (Japan); Mochizuki, Toshimitsu; Yoshita, Masahiro; Akiyama, Hidefumi [Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581 (Japan); Kuboya, Shigeyuki; Onabe, Kentaro [Department of Advanced Materials Science, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581 (Japan); Katayama, Ryuji [Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577 (Japan)

2013-12-04T23:59:59.000Z

397

On the Rigorous Derivation of the 3D Cubic Nonlinear Schrdinger Equation with A Quadratic Trap  

E-Print Network [OSTI]

We consider the dynamics of the 3D N-body Schr\\"{o}dinger equation in the presence of a quadratic trap. We assume the pair interaction potential is N^{3{\\beta}-1}V(N^{{\\beta}}x). We justify the mean-field approximation and offer a rigorous derivation of the 3D cubic NLS with a quadratic trap. We establish the space-time bound conjectured by Klainerman and Machedon [30] for {\\beta} in (0,2/7] by adapting and simplifying an argument in Chen and Pavlovi\\'c [7] which solves the problem for {\\beta} in (0,1/4) in the absence of a trap.

Xuwen Chen

2012-03-31T23:59:59.000Z

398

Transport in a harmonic trap: shortcuts to adiabaticity and ultrarobust protocols  

E-Print Network [OSTI]

We study the fast transport of a particle or a Bose-Einstein condensate in a harmonic potential. An exact expression for the final excitation energy in terms of the Fourier transform of the trap acceleration is used to engineer optimal transport protocols (with no final excitation) that are ultra-robust with respect to spring-constant errors. The same technique provides a way to design the simultaneous and robust transport of a few non-interacting species that experience different harmonic trap frequencies in the same trap.

Gury-Odelin, D

2014-01-01T23:59:59.000Z

399

Transport in a harmonic trap: shortcuts to adiabaticity and ultrarobust protocols  

E-Print Network [OSTI]

We study the fast transport of a particle or a Bose-Einstein condensate in a harmonic potential. An exact expression for the final excitation energy in terms of the Fourier transform of the trap acceleration is used to engineer optimal transport protocols (with no final excitation) that are ultra-robust with respect to spring-constant errors. The same technique provides a way to design the simultaneous and robust transport of a few non-interacting species that experience different harmonic trap frequencies in the same trap.

D. Gury-Odelin; J. G. Muga

2014-10-18T23:59:59.000Z

400

Elbow mass flow meter  

DOE Patents [OSTI]

The present invention includes a combination of an elbow pressure drop generator and a shunt-type mass flow sensor for providing an output which gives the mass flow rate of a gas that is nearly independent of the density of the gas. For air, the output is also approximately independent of humidity. 3 figs.

McFarland, A.R.; Rodgers, J.C.; Ortiz, C.A.; Nelson, D.C.

1994-08-16T23:59:59.000Z

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


401

Instream Flow Project  

Broader source: Energy.gov [DOE]

As a part of the Department of Energys Water Power Program, the Instream Flow Project was carried out by Oak Ridge National Laboratory, Pacific Northwest National Laboratory, and Argonne National Laboratory to develop tools aimed at defining environmental flow needs for hydropower operations.

402

Productivity & Energy Flow  

E-Print Network [OSTI]

1 Productivity & Energy Flow Ecosystem approach, focuses: on flow of energy, water, and nutrients (capture) of energy by autotrophs Gross (total) Net (total ­ costs) Secondary productivity- capture of energy by herbivores http://sciencebitz.com/?page_id=204 What Controls the Primary Productivity

Mitchell, Randall J.

403

An optically trapped mirror for reaching the standard quantum limit  

E-Print Network [OSTI]

The preparation of a mechanical oscillator driven by quantum back-action is a fundamental requirement to reach the standard quantum limit (SQL) for force measurement, in optomechanical systems. However, thermal fluctuating force generally dominates a disturbance on the oscillator. In the macroscopic scale, an optical linear cavity including a suspended mirror has been used for the weak force measurement, such as gravitational-wave detectors. This configuration has the advantages of reducing the dissipation of the pendulum (i.e., suspension thermal noise) due to a gravitational dilution by using a thin wire, and of increasing the circulating laser power. However, the use of the thin wire is weak for an optical torsional anti-spring effect in the cavity, due to the low mechanical restoring force of the wire. Thus, there is the trade-off between the stability of the system and the sensitivity. Here, we describe using a triangular optical cavity to overcome this limitation for reaching the SQL. The triangular cavity can provide a sensitive and stable system, because it can optically trap the mirror's motion of the yaw, through an optical positive torsional spring effect. To show this, we demonstrate a measurement of the torsional spring effect caused by radiation pressure forces.

Nobuyuki Matsumoto; Yuta Michimura; Yoichi Aso; Kimio Tsubono

2014-05-19T23:59:59.000Z

404

Certification Framework Based on Effective Trapping for Geologic Carbon Sequestration  

SciTech Connect (OSTI)

We have developed a certification framework (CF) for certifying the safety and effectiveness of geologic carbon sequestration (GCS) sites. Safety and effectiveness are achieved if CO{sub 2} and displaced brine have no significant impact on humans, other living things, resources, or the environment. In the CF, we relate effective trapping to CO{sub 2} leakage risk which takes into account both the impact and probability of leakage. We achieve simplicity in the CF by using (1) wells and faults as the potential leakage pathways, (2) compartments to represent environmental resources that may be impacted by leakage, (3) CO{sub 2} fluxes and concentrations in the compartments as proxies for impact to vulnerable entities, (4) broad ranges of storage formation properties to generate a catalog of simulated plume movements, and (5) probabilities of intersection of the CO{sub 2} plume with the conduits and compartments. We demonstrate the approach on a hypothetical GCS site in a Texas Gulf Coast saline formation. Through its generality and flexibility, the CF can contribute to the assessment of risk of CO{sub 2} and brine leakage as part of the certification process for licensing and permitting of GCS sites around the world regardless of the specific regulations in place in any given country.

Oldenburg, Curtis M.; Bryant, Steven L.; Nicot, Jean-Philippe

2009-01-15T23:59:59.000Z

405

Trapped Ion Quantum Error Correcting Protocols Using Only Global Operations  

E-Print Network [OSTI]

Quantum error-correcting codes are many-body entangled states that are prepared and measured using complex sequences of entangling operations. Each element of such an entangling sequence introduces noise to delicate quantum information during the encoding or reading out of the code. It is important therefore to find efficient entangling protocols to avoid the loss of information. Here we propose an experiment that uses only global entangling operations to encode an arbitrary logical qubit to either the five-qubit repetition code or the five-qubit code, with a six-ion Coulomb crystal architecture in a Penning trap. We show that the use of global operations enables us to prepare and read out these codes using only six and ten global entangling pulses, respectively. The proposed experiment also allows the acquisition of syndrome information during readout. We provide a noise analysis for the presented protocols, estimating that we can achieve a six-fold improvement in coherence time with noise as high as $\\sim 1\\%$ on each entangling operation.

Joseph F. Goodwin; Benjamin J. Brown; Graham Stutter; Howard Dale; Richard C. Thompson; Terry Rudolph

2014-07-07T23:59:59.000Z

406

Three-dimensional light trap for reflective particles  

DOE Patents [OSTI]

A system for containing either a reflective particle or a particle having an index of refraction lower than that of the surrounding media in a three-dimensional light cage. A light beam from a single source illuminates an optics system and generates a set of at least three discrete focussed beams that emanate from a single exit aperture and focus on to a focal plane located close to the particle. The set of focal spots defines a ring that surrounds the particle. The set of focussed beams creates a "light cage" and circumscribes a zone of no light within which the particle lies. The surrounding beams apply constraining forces (created by radiation pressure) to the particle, thereby containing it in a three-dimensional force field trap. A diffractive element, such as an aperture multiplexed lens, or either a Dammann grating or phase element in combination with a focusing lens, may be used to generate the beams. A zoom lens may be used to adjust the size of the light cage, permitting particles of various sizes to be captured and contained.

Neal, Daniel R. (Tijeras, NM)

1999-01-01T23:59:59.000Z

407

Memory effects in the relaxation of the Gaussian trap model  

E-Print Network [OSTI]

We investigate the memory effect in a simple model for glassy relaxation, a trap model with a Gaussian density of states. In this model thermal equilibrium is reached at all finite temperatures and therefore we can consider jumps from low to high temperatures in addition to the quenches usually considered in aging studies. We show that the evolution of the energy following the Kovacs-protocol can approximately be expressed as a difference of two monotonously decaying functions and thus show the existence of a so-called Kovacs hump whenever these functions are not single exponentials. It is well established that the Kovacs effect also occurs in the linear response regime and we show that most of the gross features do not change dramatically when large temperature jumps are considered. However, there is one distinguishing feature that only exists beyond the linear regime which we discuss in detail. For the memory experiment with 'inverted' temperatures, i.e. jumping up and then down again, we find a very similar behavior apart from an opposite sign of the hump.

Gregor Diezemann; Andreas Heuer

2011-02-02T23:59:59.000Z

408

Elliptic flow phenomenon at ATLAS  

E-Print Network [OSTI]

We summarize measurements of elliptic flow and higher order flow harmonics performed by the ATLAS experiment at the LHC. Results on event-averaged flow measurements and event-plane correlations in Pb+Pb collisions are discussed along with the event-by-event flow measurements. Further, we summarize results on flow in p+Pb collisions.

Martin Spousta

2014-06-20T23:59:59.000Z

409

Bear Trap Hot Spring Pool & Spa Low Temperature Geothermal Facility | Open  

Open Energy Info (EERE)

Trap Hot Spring Pool & Spa Low Temperature Geothermal Facility Trap Hot Spring Pool & Spa Low Temperature Geothermal Facility Jump to: navigation, search Name Bear Trap Hot Spring Pool & Spa Low Temperature Geothermal Facility Facility Bear Trap Hot Spring Sector Geothermal energy Type Pool and Spa Location Norris, Montana Coordinates 45.5679836°, -111.690808° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[]}

410

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

Office of Science (SC) Website

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

411

Triplet Transport to and Trapping by Acceptor End Groups on Conjugated  

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

Triplet Transport to and Trapping by Acceptor End Groups on Conjugated Triplet Transport to and Trapping by Acceptor End Groups on Conjugated Polyfluorene Chains Paiboon Sreearunothai, Alexis Estrada, Sadayuki Asaoka, Marta Kowalczyk, Seogjoo Jang, Andrew R. Cook, Jack M. Preses and John R. Miller J. Phys. Chem. C 115, 19569-19577 (2011). [Find paper at ACS Publications] Abstract: Triplet excited states created in polyfluorene (pF) molecules having average lengths up to 170 repeat units were transported to and captured by trap groups at the ends in less ~40 ns. Almost all of the triplets attached to the chains reached the trap groups, ruling out the presence of substantial numbers of defects that prevent transport. The transport yields a diffusion coefficient D of at least 3 x 10-4 cm2 s-1, which is 30 times typical molecular diffusion and close to a value for triplet transport

412

A 674 nm external cavity diode laser for a ??Sr? ion trap  

E-Print Network [OSTI]

Atomic ion traps are a promising candidate for scalable quantum information processing. In this thesis, a 674 nm extended cavity diode laser is built to address an optical quantum bit in ??Sr? with the goal of testing such ...

Thon, Susanna M. (Susanna Mitrani)

2005-01-01T23:59:59.000Z

413

Trapping of microorganism using cylindrical standing ultrasound waves and its application to water purification  

Science Journals Connector (OSTI)

In biological fields it is known that the ultrasound is useful for trapping of biological cells or microorganism. Recently several experimental results of micro-particle trapping by acoustic standing wave fields which are formed by plane waves have been reported. In this study we confirm that the standing waves by a cylindrical ultrasonic transducer can trap and aggregate the microorganism such as green algae chlorella etc. Those microorganism were trapped at specific positions determined by acoustic pressure distribution and the density of aggregation is increased according to the lapse time after the transducer operating. The dense colony of microorganism is easily filtered out by a sieve. A water purification system using this phenomenon was designed and the efficiency was verified by considering the density change of the microorganism after the ultrasonic treatment. Consequently it is shown that the standing wave in a cylindrical transducer can be applied to water purification.

Hae-Rang Hwang; Yonggang Cao; Jungsoon Kim; Moojoon Kim; Kang-Lyeol Ha

2012-01-01T23:59:59.000Z

414

Trapping and excitation of modes in the magnetotail Katharine J. Mills and Andrew N. Wrighta)  

E-Print Network [OSTI]

Trapping and excitation of modes in the magnetotail Katharine J. Mills and Andrew N. Wrighta wind speed, Dungey obtained a value of about 1000 RE for the length of the magnetotail. Magnetometer

Wright, Andrew N.

415

Analysis of mineral trapping for CO2 disposal in deep aquifers  

E-Print Network [OSTI]

of Mineral Trapping for CO2 Disposal in Deep Aquifers Tianfue~mail: Tianfu Xu@lbl. gov) CO2 disposal into deep aquiferspermit significant sequestration of CO2. We performed batch

Xu, Tianfu

2014-01-01T23:59:59.000Z

416

Study of electron trapping by a transversely ellipsoidal bubble in the laser wake-field acceleration  

SciTech Connect (OSTI)

We present electron trapping in an ellipsoidal bubble which is not well explained by the spherical bubble model by [Kostyukov et al., Phys. Rev. Lett. 103, 175003 (2009)]. The formation of an ellipsoidal bubble, which is elongated transversely, frequently occurs when the spot size of the laser pulse is large compared to the plasma wavelength. First, we introduce the relation between the bubble size and the field slope inside the bubble in longitudinal and transverse directions. Then, we provide an ellipsoidal model of the bubble potential and investigate the electron trapping condition by numerical integration of the equations of motion. We found that the ellipsoidal model gives a significantly less restrictive trapping condition than that of the spherical bubble model. The trapping condition is compared with three-dimensional particle-in-cell simulations and the electron trajectory in test potential simulations.

Cho, Myung-Hoon [School of Natural Science, UNIST, BanYeon-Ri 100, Ulju-gun, Ulsan 689-798 (Korea, Republic of)] [School of Natural Science, UNIST, BanYeon-Ri 100, Ulju-gun, Ulsan 689-798 (Korea, Republic of); Kim, Young-Kuk; Hur, Min Sup [School of Electrical and Computer Engineering, UNIST, BanYeon-Ri 100, Ulju-gun, Ulsan 689-798 (Korea, Republic of)] [School of Electrical and Computer Engineering, UNIST, BanYeon-Ri 100, Ulju-gun, Ulsan 689-798 (Korea, Republic of)

2013-09-15T23:59:59.000Z

417

EXPERIMENTAL RESULTS ON TRAPPING A GUN PLASMA IN TORMAC P-l  

E-Print Network [OSTI]

P.A. Pincosy, A Toroidal Plasma Gun, 11 LBL-9507, (1979),RESULTS ON TRAPPING A GUN PLASMA IN TORMAC P-~1* P. A.further work on the higher gun p13sma energy may lead to

Pincosy, P.A.

2012-01-01T23:59:59.000Z

418

Phase slippage and self-trapping in a self-induced bosonic Josephson junction  

SciTech Connect (OSTI)

A dipolar condensate confined in a toroidal trap constitutes a self-induced Josephson junction when the dipoles are oriented perpendicularly to the trap symmetry axis and the s-wave scattering length is small enough. The ring-shaped double-well potential coming from the anisotropic character of the mean-field dipolar interaction is robust enough to sustain self-trapping dynamics, which takes place when the initial population imbalance between the two wells is large. We show that, in this system, the self-trapping regime is directly related to a vortex-induced phase-slip dynamics. A vortex and antivortex are spontaneously nucleated in the low-density regions before a minimum of the population imbalance is reached and then cross the toroidal section in opposite directions through the junctions. This vortex dynamics yields a phase slip between the two weakly linked condensates causing an inversion of the particle flux.

Abad, M.; Guilleumas, M.; Mayol, R.; Pi, M. [Departament d'Estructura i Constituents de la Materia, Facultat de Fisica, Universitat de Barcelona, E-08028 Barcelona (Spain); Jezek, D. M. [IFIBA-CONICET and Departamento de Fisica, FCEN-UBA Pabellon 1, Ciudad Universitaria, 1428 Buenos Aires (Argentina)

2011-09-15T23:59:59.000Z

419

Poly(vinyl alcohol)-based buffering membranes for isoelectric trapping separations  

E-Print Network [OSTI]

Isoelectric trapping (IET) in multicompartment electrolyzers (MCE) has been widely used for the electrophoretic separation of ampholytic compounds such as proteins. In IET, the separation occurs in the buffering membranes that form a step-wise p...

Craver, Helen C.

2009-05-15T23:59:59.000Z

420

Phase-slippage and self-trapping in a self-induced bosonic Josephson junction  

E-Print Network [OSTI]

A dipolar condensate confined in a toroidal trap constitutes a self-induced Josepshon junction when the dipoles are oriented perpendicularly to the trap symmetry axis and the s-wave scattering length is small enough. The ring-shaped double-well potential coming from the anisotropic character of the mean-field dipolar interaction is robust enough to sustain self-trapping dynamics, which takes place when the initial population imbalance between the two wells is large. We show that in this system the self-trapping regime is directly related to a vortex-induced phase-slip dynamics. A vortex and antivortex are spontaneously nucleated in the low density regions, before a minimum of the population imbalance is reached, and then cross the toroidal section in opposite directions through the junctions.This vortex dynamics yields a phase slip between the two weakly linked condensates causing an inversion of the particle flux.

Abad, M; Mayol, R; Pi, M; Jezek, D M

2011-01-01T23:59:59.000Z

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


421

137Cs Trapped by Biomass within 20 km of the Fukushima Daiichi Nuclear Power Plant  

Science Journals Connector (OSTI)

137Cs Trapped by Biomass within 20 km of the Fukushima Daiichi Nuclear Power Plant ... Department of Health and Environmental Sciences, Graduate School of Medicine, Kyoto University, Kyoto 606-8501, Japan ...

Akio Koizumi; Tamon Niisoe; Kouji H. Harada; Yukiko Fujii; Ayumu Adachi; Toshiaki Hitomi; Hirohiko Ishikawa

2013-07-26T23:59:59.000Z

422

Influence of the Radio-Frequency source properties on RF-based atom traps  

Science Journals Connector (OSTI)

We discuss the quality required for the RF source used to trap neutral atoms in RF-dressed potentials. We illustrate this discussion with experimental results obtained on a Bose-Einstein condensation experimen...

O. Morizot; L. Longchambon; R. Kollengode Easwaran

2008-04-01T23:59:59.000Z

423

The Dissipation of Trapped Lee Waves. Part I: Leakage of Inviscid Waves into the Stratosphere  

Science Journals Connector (OSTI)

Leaky trapped mountain lee waves are investigated by examining the structure of individual linear modes in multilayer atmospheres. When the static stability and cross-mountain wind speed are constant in the topmost unbounded layer, modes that ...

Dale R. Durran; Matthew O. G. Hills; Peter N. Blossey

424

Efficient Light Trapping in Inverted Nanopyramid Thin Crystalline Silicon Membranes for Solar Cell Applications  

E-Print Network [OSTI]

Thin-film crystalline silicon (c-Si) solar cells with light-trapping structures can enhance light absorption within the semiconductor absorber layer and reduce material usage. Here we demonstrate that an inverted nanopyramid ...

Mavrokefalos, Anastassios

425

An injection-locked 674 nm laser for Strontium-88 ion trapping  

E-Print Network [OSTI]

Energy levels of the valence electron of a single trapped ??Sr+ ion can be harnessed as an effective qubit for quantum information processing. The qubit transition to a metastable energy state can be stimulated by a laser ...

Katz, Rena J. (Rena Jenelle)

2012-01-01T23:59:59.000Z

426

WAVELENGTH DEPENDENT EFFECTIVE TRAP DENSITY IN CdTe : EVIDENCE FOR THE PRESENCE OF TWO  

E-Print Network [OSTI]

1 WAVELENGTH DEPENDENT EFFECTIVE TRAP DENSITY IN CdTe : EVIDENCE FOR THE PRESENCE OF TWO.1016/S0030-4018(96)00516-0 #12;2 Photorefractive semiconductors like CdTe are characterized by a low

427

Novel light trapping scheme for thin crystalline cells utilizing deep structures on both wafer sides  

SciTech Connect (OSTI)

A new light trapping structure is presented with trapping capabilities comparable to or better than those of the perpendicular grooves structure. The new structure traps a larger fraction of rays for 8--80 passes than the perpendicular grooves structure. The average path length enhancement is about 62 times the average thickness. The structure consists of deep ({approximately}200 {micro}m) inverted pyramids on the front side and deep ({approximately}200 {micro}m) truncated pyramids with eight sides on the back. The structure is realized in crystalline silicon by wet chemical etching using potassium hydroxide (KOH) and isopropanol (IPA). A process for creating thin solar cells with this light trapping scheme is described. The process includes only two main photolithographic steps and features a self aligned front metallization. The process uses 250 {micro}m wafers to create cells that on average are about 70 {micro}m thick.

Jorgensen, A.M.; Clausen, T.; Leistiko, O. [Technical Univ. of Denmark, Lyngby (Denmark). Microelectronics Centre

1997-12-31T23:59:59.000Z

428

Molecular-bond hardening and dynamics of molecular stabilization and trapping in intense laser pulses  

E-Print Network [OSTI]

stabilization and population trapping of high-lying vibrational states and chemical bond hardening are predicted for both continuous-wave (cw) lasers and short laser pulses. While the intensity dependences of the laser-induced stabilization are essentially...

Yao, Guanhua; Chu, Shih-I

1993-07-01T23:59:59.000Z

429

Engineering optical traps for new environments and applications in the measurement of biological adhesives and motors  

E-Print Network [OSTI]

Optical traps have played a central role in the exploration of biological systems through the examination of molecular motors, biopolymers, and many other interactions at the nano and micro length scales. This thesis seeks ...

Appleyard, David Collins

2009-01-01T23:59:59.000Z

430

Quantum state engineering for multiple hot trapped ions in the symmetric Dicke subspace  

Science Journals Connector (OSTI)

We propose a scheme for the generation of an arbitrary quantum states for multiple trapped ions in the symmetric Dicke subspace. One can manipulate the collective ion transition in a selective symmetric Dicke ...

S. B. Zheng

2009-09-01T23:59:59.000Z

431

Technological assessment of light-trapping technology for thin-film Si solar cell  

E-Print Network [OSTI]

The proposed light trapping technology of Distributed Bragg Reflector (DBR) with Diffraction Grating (DG) and Anti-Reflection Coating (ARC) for thin film Si solar cell was analyzed from the technology, market, and ...

Susantyoko, Rahmat Agung

2009-01-01T23:59:59.000Z

432

Light trapping in thin film solar cells using textured photonic crystal  

DOE Patents [OSTI]

A solar cell includes a photoactive region that receives light. A photonic crystal is coupled to the photoactive region, wherein the photonic crystal comprises a distributed Bragg reflector (DBR) for trapping the light.

Yi, Yasha (Somerville, MA); Kimerling, Lionel C. (Concord, MA); Duan, Xiaoman (Amesbury, MA); Zeng, Lirong (Cambridge, MA)

2009-01-27T23:59:59.000Z

433

Integrated photonic structures for light trapping in thin-film Si solar cells  

E-Print Network [OSTI]

We explore the mechanisms for an efficient light trapping structure for thin-film silicon solar cells. The design combines a distributed Bragg reflector (DBR) and periodic gratings. Using photonic band theories and numerical ...

Sheng, Xing

434

Abstract LB-258: Neutrophil extracellular traps sequester circulating tumor cells via beta 1 integrin mediated interactions  

Science Journals Connector (OSTI)

...have previously demonstrated that Neutrophil extracellular traps (NETs), composed of extracellular neutrophil-derived DNA webs, are intricately implicated in this process by directly binding and capturing circulating tumor cells. However, the mechanisms...

Sara Najmeh; Jonathan Cools-Lartigue; Stephen Gowing; Jonahan Spicer; Braedon McDonald; Betty Giannias; France Bourdeau; Paul Kubes; Lorenzo Edwin Ferri

2014-10-01T23:59:59.000Z

435

Combining Low-Temperature Combustion with Lean-NOx Trap Yields...  

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

and Posters 2005deerhuff.pdf More Documents & Publications Intra-catalyst Reductant Chemistry in Lean NOx Traps: A Study on Sulfur Effects Reductant Utilization in a LNT + SCR...

436

Intra-catalyst Reductant Chemistry in Lean NOx Traps: A Study...  

Broader source: Energy.gov (indexed) [DOE]

Intra-catalyst Reductant Chemistry in Lean NOx Traps: A Study on Sulfur Effects Jim Parks (parksjeii@ornl.gov), Matt Swartz, Shean Huff, Brian West Oak Ridge National Laboratory...

437

Vertically aligned gas-insulated transmission line having particle traps at the inner conductor  

DOE Patents [OSTI]

Gas insulated electrical apparatus having first and second conductors separated by an insulating support within an insulating gas environment, and particle traps disposed along the surface of the high potential conductor for trapping and inactivating foreign particles which may be present within the insulating gas medium. Several embodiments of the invention were developed which are particularly suited for vertically aligned gas insulated transmission lines. The particle traps are grooves or cavities formed into the walls of the tubular inner conductor, without extending into the hollow portion of the conductor. In other embodiments, the traps are appendages or insert flanges extending from the inner conductor, with the insulator supports contacting the appendages instead of the inner conductor.

Dale, Steinar J. (Monroeville, PA)

1984-01-01T23:59:59.000Z

438

Destabilization of low-n peeling modes by trapped energetic particles  

SciTech Connect (OSTI)

The kinetic effect of trapped energetic particles (EPs), arising from perpendicular neutral beam injection, on the stable low-n peeling modes in tokamak plasmas is investigated, through numerical solution of the mode's dispersion relation derived from an energy principle. A resistive-wall peeling mode with m/n=6/1, with m and n being the poloidal and toroidal mode numbers, respectively, is destabilized by trapped EPs as the EPs' pressure exceeds a critical value ?{sub c}{sup *}, which is sensitive to the pitch angle of trapped EPs. The dependence of ?{sub c}{sup *} on the particle pitch angle is eventually determined by the bounce average of the mode eigenfunction. Peeling modes with higher m and n numbers can also be destabilized by trapped EPs. Depending on the wall distance, either a resistive-wall peeling mode or an ideal-kink peeling mode can be destabilized by EPs.

Hao, G. Z.; Wang, A. K.; Mou, Z. Z.; Qiu, X. M. [Southwestern Institute of Physics, PO Box 432, Chengdu 610041 (China)] [Southwestern Institute of Physics, PO Box 432, Chengdu 610041 (China); Liu, Y. Q. [Euratom/CCFE Fusion Association, Culham Science Centre, Abingdon, OX14 3DB (United Kingdom)] [Euratom/CCFE Fusion Association, Culham Science Centre, Abingdon, OX14 3DB (United Kingdom); Matsunaga, G. [Japan Atomic Energy Agency, 801-1, Mukouyama, Naka, Ibaraki 311-0193 (Japan)] [Japan Atomic Energy Agency, 801-1, Mukouyama, Naka, Ibaraki 311-0193 (Japan); Okabayashi, M. [Princeton Plasma Physics Laboratory, PO Box 451, Princeton, New Jersey 08543-0451 (United States)] [Princeton Plasma Physics Laboratory, PO Box 451, Princeton, New Jersey 08543-0451 (United States)

2013-06-15T23:59:59.000Z

439

Maximization of permanent trapping of CO{sub 2} and co-contaminants in the highest-porosity formations of the Rock Springs Uplift (Southwest Wyoming): experimentation and multi-scale modeling  

SciTech Connect (OSTI)

Under this project, a multidisciplinary team of researchers at the University of Wyoming combined state-of-the-art experimental studies, numerical pore- and reservoir-scale modeling, and high performance computing to investigate trapping mechanisms relevant to geologic storage of mixed scCO{sub 2} in deep saline aquifers. The research included investigations in three fundamental areas: (i) the experimental determination of two-?phase flow relative permeability functions, relative permeability hysteresis, and residual trapping under reservoir conditions for mixed scCO{sub 2}-?brine systems; (ii) improved understanding of permanent trapping mechanisms; (iii) scientifically correct, fine grid numerical simulations of CO{sub 2} storage in deep saline aquifers taking into account the underlying rock heterogeneity. The specific activities included: (1) Measurement of reservoir-?conditions drainage and imbibition relative permeabilities, irreducible brine and residual mixed scCO{sub 2} saturations, and relative permeability scanning curves (hysteresis) in rock samples from RSU; (2) Characterization of wettability through measurements of contact angles and interfacial tensions under reservoir conditions; (3) Development of physically-?based dynamic core-?scale pore network model; (4) Development of new, improved high-? performance modules for the UW-?team simulator to provide new capabilities to the existing model to include hysteresis in the relative permeability functions, geomechanical deformation and an equilibrium calculation (Both pore-? and core-?scale models were rigorously validated against well-?characterized core-? flooding experiments); and (5) An analysis of long term permanent trapping of mixed scCO{sub 2} through high-?resolution numerical experiments and analytical solutions. The analysis takes into account formation heterogeneity, capillary trapping, and relative permeability hysteresis.

Piri, Mohammad

2014-03-31T23:59:59.000Z

440

Laser cooling and sympathetic cooling in a linear quadrupole rf trap  

E-Print Network [OSTI]

LASER COOLING AND SYMPATHETIC COOLING IN A LINEAR QUADRUPOLE RF TRAP A Dissertation by VLADIMIR LEONIDOVICH RYJKOV Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree... of DOCTOR OF PHILOSOPHY December 2003 Major Subject: Physics LASER COOLING AND SYMPATHETIC COOLING IN A LINEAR QUADRUPOLE RF TRAP A Dissertation by VLADIMIR LEONIDOVICH RYJKOV Submitted to Texas A&M University in partial fulfillment of the requirements...

Ryjkov, Vladimir Leonidovich

2005-02-17T23:59:59.000Z

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


441

Emittance and Current of Electrons Trapped in a Plasma Wakefield Accelerator  

SciTech Connect (OSTI)

In recent experiments plasma electrons became trapped in a plasma wakefield accelerator (PWFA). The transverse size of these trapped electrons on a downstream diagnostic yields an upper limit measurement of transverse normalized emittance divided by peak current, {epsilon}{sub N,{sub x}}/I. The lowest upper limit for {epsilon}{sub N,{sub x}}/I measured in the experiment is 1.3{center_dot}10{sup -10} m/A.

Kirby, N.; Blumenfeld, I.; Decker, F. J.; Hogan, M. J.; Ischebeck, R.; Iverson, R. H.; Siemann, R. H.; Walz, D. R. [Stanford Linear Accelerator Center, Stanford University, Stanford, California 94305 (United States); Clayton, C. E.; Huang, C.; Joshi, C.; Lu, W.; Marsh, K. A.; Mori, W. B.; Zhou, M. [University of California, Los Angeles, California 90095 (United States); Katsouleas, T.; Muggli, P.; Oz, E. [University of Southern California, Los Angeles, California 90089 (United States); Martins, S. [GoLP/IPFN, Instituto Superior Tecnico (Portugal)

2009-01-22T23:59:59.000Z

442

Dynamical density functional theory with hydrodynamic interactions and colloids in unstable traps  

E-Print Network [OSTI]

A density functional theory for colloidal dynamics is presented which includes hydrodynamic interactions between the colloidal particles. The theory is applied to the dynamics of colloidal particles in an optical trap which switches periodically in time from a stable to unstable confining potential. In the absence of hydrodynamic interactions, the resulting density breathing mode, exhibits huge oscillations in the trap center which are almost completely damped by hydrodynamic interactions. The predicted dynamical density fields are in good agreement with Brownian dynamics computer simulations.

M. Rex; H. Loewen

2008-03-13T23:59:59.000Z

443

Sharp Phase Transitions in a Small Frustrated Network of Trapped Ion Spins  

Science Journals Connector (OSTI)

Sharp quantum phase transitions typically require a large system with many particles. Here we show that, for a frustrated fully connected Ising spin network represented by trapped atomic ions, the competition between different spin orders leads to rich phase transitions whose sharpness scales exponentially with the number of spins. This unusual finite-size scaling behavior opens up the possibility of observing sharp quantum phase transitions in a system of just a few trapped ion spins.

G.-D. Lin; C. Monroe; L.-M. Duan

2011-06-08T23:59:59.000Z

444

Observation of Power-Law Scaling for Phase Transitions in Linear Trapped Ion Crystals  

Science Journals Connector (OSTI)

We report an experimental confirmation of the power-law relationship between the critical anisotropy parameter and ion number for the linear-to-zigzag phase transition in an ionic crystal. Our experiment uses laser cooled calcium ions confined in a linear radio-frequency trap. Measurements for up to ten ions are in good agreement with theoretical and numeric predictions. Implications on an upper limit to the size of data registers in ion trap quantum computers are discussed.

D. G. Enzer; M. M. Schauer; J. J. Gomez; M. S. Gulley; M. H. Holzscheiter; P. G. Kwiat; S. K. Lamoreaux; C. G. Peterson; V. D. Sandberg; D. Tupa; A. G. White; R. J. Hughes; D. F. V. James

2000-09-18T23:59:59.000Z

445

Observation of power-law scaling for phase transitions in linear trapped ion crystals  

E-Print Network [OSTI]

We report an experimental confirmation of the power-law relationship between the critical anisotropy parameter and ion number for the linear-to-zigzag phase transition in an ionic crystal. Our experiment uses laser cooled calcium ions confined in a linear radio-frequency trap. Measurements for up to 10 ions are in good agreement with theoretical and numeric predictions. Implications on an upper limit to the size of data registers in ion trap quantum computers are discussed.

D. G. Enzer; M. M. Schauer; J. J. Gomez; M. S. Gulley; M. H. Holzscheiter; P. G. Kwiat; S. K. Lamoreaux; C. G. Peterson; V. D. Sandberg; D. Tupa; A. G. White; R. J. Hughes; D. F. V. James

2000-08-09T23:59:59.000Z

446

Sharp phase transitions in a small frustrated network of trapped ion spins  

E-Print Network [OSTI]

Sharp quantum phase transitions typically require a large system with many particles. Here we show that for a frustrated fully-connected Ising spin network represented by trapped atomic ions, the competition between different spin orders leads to rich phase transitions whose sharpness scales exponentially with the number of spins. This unusual finite-size scaling behavior opens up the possibility of observing sharp quantum phase transitions in a system of just a few trapped ion spins.

G. -D. Lin; C. Monroe; L. -M. Duan

2010-11-25T23:59:59.000Z

447

Boundary-Activated Dissociation of Peptide Ions in a Quadrupole Ion Trap  

Science Journals Connector (OSTI)

As with resonant excitation, the pulsed introduction of heavy gases (argon, xenon) extends the applicability of BAD when tandem mass spectrometry is performed on peptide ions. ... 22 The dipolar square wave causes the electrical center of the trapping field and the center of ions' oscillation to change instantly with no change in the spatial location of the ions. ... When an ion has a stable trajectory in the quadrupole ion trap, it can be considered to be oscillating in a pseudopotential well. ...

Richard W. Vachet; Gary L. Glish

1998-01-15T23:59:59.000Z

448

Muon Spin Relaxation Studies of Lithium Nitridometallate Battery Materials: Muon Trapping and Lithium Ion Diffusion  

Science Journals Connector (OSTI)

Muon Spin Relaxation Studies of Lithium Nitridometallate Battery Materials: Muon Trapping and Lithium Ion Diffusion ... The muons themselves are quasi-static, most probably located in a 4h site between the [Li2N] plane and the Li(1)/Ni layer. ... The initial fall in ? results from an increase in muon hopping as the temperature is raised, while the subsequent rise originates from an increasing proportion of trapped and therefore static muons. ...

Andrew S. Powell; James S. Lord; Duncan H. Gregory; Jeremy J. Titman

2009-10-27T23:59:59.000Z

449

Fast transitionless expansions of Gaussian anharmonic traps for cold atoms: bang-singular-bang control  

E-Print Network [OSTI]

Combining invariant-based inverse engineering, perturbation theory, and Optimal Control Theory, we design fast, transitionless expansions of cold neutral atoms or ions in Gaussian anharmonic traps. Bounding the possible trap frequencies and using a "bang-singular-bang" control we find fast processes for a continuum of durations up to a minimum time that corresponds to a purely bang-bang (stepwise frequency constant) control.

Xiao-Jing Lu; Xi Chen; J. Alonso; J. G. Muga

2014-01-07T23:59:59.000Z

450

Extending Penning trap mass measurements with SHIPTRAP to the heaviest elements  

SciTech Connect (OSTI)

Penning-trap mass spectrometry of radionuclides provides accurate mass values and absolute binding energies. Such mass measurements are sensitive indicators of the nuclear structure evolution far away from stability. Recently, direct mass measurements have been extended to the heavy elements nobelium (Z=102) and lawrencium (Z=103) with the Penning-trap mass spectrometer SHIPTRAP. The results probe nuclear shell effects at N=152. New developments will pave the way to access even heavier nuclides.

Block, M.; Ackermann, D.; Herfurth, F.; Hofmann, S. [GSI Helmholtzzentrum fuer Schwerionenforschung GmbH, 64291 Darmstadt (Germany); Blaum, K. [Max-Planck-Institut fuer Kernphysik, 69117 Heidelberg, Germany and Ruprecht-Karls-Universitaet, 69120 Heidelberg (Germany); Droese, C.; Marx, G.; Schweikhard, L. [Ernst-Moritz-Arndt-Universitaet, 17487 Greifswald (Germany); Duellmann, Ch. E. [Johannes Gutenberg-Universitaet, 55099 Mainz, Germany and GSI Helmholtzzentrum fuer Schwerionenforschung GmbH, 64291 Darmstadt, Germany and Helmholtz-Institut Mainz, 55099 Mainz (Germany); Eibach, M. [Ruprecht-Karls-Universitaet, 69120 Heidelberg, Germany and Johannes Gutenberg-Universitaet, 55099 Mainz (Germany); Eliseev, S. [Max-Planck-Institut fuer Kernphysik, 69117 Heidelberg (Germany); Haettner, E.; Plass, W. R.; Scheidenberger, C. [GSI Helmholtzzentrum fuer Schwerionenforschung GmbH, 64291 Darmstadt, Germany and Justus-Liebig-Universitaet, 35392 Giessen (Germany); Hessberger, F. P. [GSI Helmholtzzentrum fuer Schwerionenforschung GmbH, 64291 Darmstadt, Germany and Helmholtz-Institut Mainz, 55099 Mainz (Germany); Ramirez, E. Minaya [Helmholtz-Institut Mainz, 55099 Mainz, Germany and GSI Helmholtzzentrum fuer Schwerionenforschung GmbH, 64291 Darmstadt (Germany); Nesterenko, D. [Petersburg Nuclear Physics Institute, Gatchina, 188300 St. Petersburg (Russian Federation); and others

2013-03-19T23:59:59.000Z

451

Trapping of Implanted He at Cu/Nb Interfaces Measured by Neutron Reflectometry  

SciTech Connect (OSTI)

In single crystalline metals, He is insoluble and precipitates into bubbles. In contrast, Cu-Nb multilayers show no evidence of bubble formation below a critical concentration. The conclusions of this paper are: (1) He is trapped at Cu/Nb , Cu/Mo interfaces; (2) He is trapped interstitially; (3) The interface swells {approx} 10 times; and (4) The layered structure retains despite the swell of interfaces.

Wang, Peng [Los Alamos National Laboratory; Zhernenkov, Mikhail [Applications Scientist at Nanometrics; Kashinath, Abishek [MIT; Demkowicz, Michael [MIT; Baldwin, Jon K. [Los Alamos National Laboratory; Majewski, Jaroslaw [Los Alamos National Laboratory

2012-06-20T23:59:59.000Z

452

Multiphase Flow Modeling Research  

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

Science Science Chris Guenther, Director Computational Science Division RUA Spring Meeting, Morgantown, WV March 2013 2 NETL's Multiphase Flow Science Team * The Multiphase Flow Science Team develops physics-based simulation models to conduct applied scientific research. - Development of new theory - Extensive on-site and collaborative V&V efforts and testing - Engages in technology transfer - Applies the models to industrial scale problems. 3 Why is Multiphase Flow Science Needed? * Industry is increasingly relying on multiphase technologies to produce clean and affordable energy with carbon capture. * Unfortunately, the presence of a solid phase reduces the operating capacity of a typical energy device from its original design on average by 40% [1].

453

Shroud leakage flow discouragers  

DOE Patents [OSTI]

A turbine assembly includes a plurality of rotor blades comprising a root portion, an airfoil having a pressure sidewall and a suction sidewall, and a top portion having a cap. An outer shroud is concentrically disposed about said rotor blades, said shroud in combination with said tip portions defining a clearance gap. At least one circumferential shroud leakage discourager is disposed within the shroud. The leakage discourager(s) increase the flow resistance and thus reduce the flow of hot gas flow leakage for a given pressure differential across the clearance gap to improve overall turbine efficiency.

Bailey, Jeremy Clyde (Middle Grove, NY); Bunker, Ronald Scott (Niskayuna, NY)

2002-01-01T23:59:59.000Z

454

Bypass Flow Study  

SciTech Connect (OSTI)

The purpose of the fluid dynamics experiments in the MIR (Matched Index of-Refraction) flow system at Idaho National Laboratory (INL) is to develop benchmark databases for the assessment of Computational Fluid Dynamics (CFD) solutions of the momentum equations, scalar mixing, and turbulence models for the flow ratios between coolant channels and bypass gaps in the interstitial regions of typical prismatic standard fuel element (SFE) or upper reflector block geometries of typical Modular High-temperature Gas-cooled Reactors (MHTGR) in the limiting case of negligible buoyancy and constant fluid properties. The experiments use Particle Image Velocimetry (PIV) to measure the velocity fields that will populate the bypass flow study database.

Richard Schultz

2011-09-01T23:59:59.000Z

455

Deuterium trapping at defects created with neutron and ion irradiations in tungsten  

SciTech Connect (OSTI)

The effects of neutron and ion irradiations on deuterium (D) retention in tungsten (W) were investigated. Specimens of pure W were irradiated with neutrons to 0.3 dpa at around 323 K and then exposed to high-flux D plasma at 473 and 773 K. The concentration of D significantly increased by neutron irradiation and reached 0.8 at% at 473 K and 0.4 at% at 773 K. Annealing tests for the specimens irradiated with 20 MeV W ions showed that the defects which play a dominant role in the trapping at high temperature were stable at least up to 973 K, while the density decreased at temperatures equal to or above 1123 K. These observations of the thermal stability of traps and the activation energy for D detrapping examined in a previous study (1.8 eV) indicated that the defects which contribute predominantly to trapping at 773 K were small voids. The higher concentration of trapped D at 473 K was explained by additional contributions of weaker traps. The release of trapped D was clearly enhanced by the exposure to atomic hydrogen at 473 K, though higher temperatures are more effective for using this effect for tritium removal in fusion reactors.

Y. Hatano; M. Shimada; T. Otsuka; Y. Oya; V.Kh. Alimov; M. Hara; J. Shi; M. Kobayashi; T. Oda; G. Cao; K. Okuno; T. Tanaka; K. Sugiyama; J. Roth; B. Tyburska-Pschel; J. Dorner; N. Yoshida; N. Futagami; H. Watanabe; M. Hatakeyama; H. Kurishita; M. Sokolov; Y. Katoh

2013-07-01T23:59:59.000Z

456

Disorder improves nanophotonic light trapping in thin-film solar cells  

SciTech Connect (OSTI)

We present a systematic experimental study on the impact of disorder in advanced nanophotonic light-trapping concepts of thin-film solar cells. Thin-film solar cells made of hydrogenated amorphous silicon were prepared on imprint-textured glass superstrates. For periodically textured superstrates of periods below 500?nm, the nanophotonic light-trapping effect is already superior to state-of-the-art randomly textured front contacts. The nanophotonic light-trapping effect can be associated to light coupling to leaky waveguide modes causing resonances in the external quantum efficiency of only a few nanometer widths for wavelengths longer than 500?nm. With increasing disorder of the nanotextured front contact, these resonances broaden and their relative altitude decreases. Moreover, overall the external quantum efficiency, i.e., the light-trapping effect, increases incrementally with increasing disorder. Thereby, our study is a systematic experimental proof that disorder is conceptually an advantage for nanophotonic light-trapping concepts employing grating couplers in thin-film solar cells. The result is relevant for the large field of research on nanophotonic light trapping in thin-film solar cells which currently investigates and prototypes a number of new concepts including disordered periodic and quasi periodic textures.

Paetzold, U. W., E-mail: u.paetzold@fz-juelich.de; Smeets, M.; Meier, M.; Bittkau, K.; Merdzhanova, T.; Smirnov, V.; Carius, R.; Rau, U. [IEK5Photovoltaik, Forschungszentrum Jlich GmbH, 52425 Jlich (Germany); Michaelis, D.; Waechter, C. [Fraunhofer Institut fr Angewandte Optik und Feinmechanik, Albert Einstein Str. 7, D-07745 Jena (Germany)

2014-03-31T23:59:59.000Z

457

Magnetically stimulated fluid flow patterns  

ScienceCinema (OSTI)

Sandia National Laboratories' Jim Martin and Kyle Solis explain research on the effects of magnetic fields on fluid flows and how they stimulate vigorous flows. Fluid flow is a necessary phenomenon in everything from reactors to cooling engines in cars.

Martin, Jim; Solis, Kyle

2014-08-06T23:59:59.000Z

458

RMOTC - Testing - Flow Assurance  

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

Flow Assurance Flow Assurance RMOTC Flow Loop Facility Layout Notice: As of July 15th 2013, the Department of Energy announced the intent to sell Naval Petroleum Reserve Number 3 (NPR3). The sale of NPR-3 will also include the sale of all equipment and materials onsite. A decision has been made by the Department of Energy to complete testing at RMOTC by July 1st, 2014. RMOTC will complete testing in the coming year with the currently scheduled testing partners. For more information on the sale of NPR-3 and sale of RMOTC equipment and materials please join our mailing list here. Over a decade ago, RMOTC began cooperatively building a full-scale facility to test new flow assurance technology, mainly in the areas of hydrates and paraffins. Today, RMOTC's test facility consists of five individual loop

459

Holographic supersymmetric membrane flows  

Science Journals Connector (OSTI)

The M-theory lift of SU(3) ? U(1)R-invariant RG flow via a combinatorical use of the four-dimensional flow and 11-dimensional EinsteinMaxwell equations was found previously. By taking the three internal coordinates differently and preserving only the SU(3) symmetry from the CP2 space, we find a new 11-dimensional solution of the SU(3)-invariant RG flow interpolating from the SO(8)-invariant UV fixed point to the SU(3) ? U(1)R-invariant IR fixed point in four dimensions. We describe how the corresponding three-dimensional superconformal ChernSimons matter theory deforms. By replacing the above CP2 space with the EinsteinKahler twofold, we also find out a new 11-dimensional solution of the SU(2) ? U(1)-invariant RG flow connecting the above two fixed points in four dimensions.

Changhyun Ahn; Kyungsung Woo

2010-01-01T23:59:59.000Z

460

Optical flow switching  

E-Print Network [OSTI]

Present-day networks are being challenged by dramatic increases in bandwidth demand of emerging applications. We will explore a new transport, ldquooptical flow switchingrdquo, that will enable significant growth and ...

Chan, Vincent W. S.

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


461

Olefin Autoxidation in Flow  

E-Print Network [OSTI]

Handling hazardous multiphase reactions in flow brings not only safety advantages but also significantly improved performance, due to better mass transfer characteristics. In this paper, we present a continuous microreactor ...

Neuenschwander, Ulrich

462

Molybdenum Coatings with Filtration of Plasma Flow  

SciTech Connect (OSTI)

Deposition of molybdenum coatings in arc discharge with assistance of HF one is analyzed in this paper. To avoid substrate heating to high temperature and micro-arc formation during cleaning process, the surface cleaning was carried out with HF plasma only. For reduction of droplet fraction in plasma the 'freestanding' filter was utilized. As a filter a solenoid was used, which generated a curvilinear (with the angle of 90 deg.) transportation magnetic field. The effective crosssectional area of the plasma flow at which was observed the uniform distribution of the thickness of the applied coating, was equal to 113 sm{sup 2}. The coating on the base of arc discharge, filter and HF-biasing of substrate were deposited on different substrates, including glass and stainless steel.The optical (refractive index) properties of molybdenum films are presented. The reflective characteristics of the obtained molybdenum films in the range of wavelengths from 200 to 700 nm were measured.Molybdenum films were also investigated under the effect of the plasma emission, using an ECR discharge in a simple double-mirror magnetic trap. The time varying negative potential was supplied to sample holder what provided a wide energy distribution of ions bombarded the sample surface in range 30...1500V.

Gasilin, V. V.; Nezovibat'ko, Y. N.; Shvets, O. M.; Taran, V. S.; Tereshin, V. I.; Timoshenko, A. I.; Zavaleev, V. A. [National Science Center Kharkov Institute of Physics and Technology, Akademicheskaya 1, 61108, Kharkov (Ukraine)

2008-03-19T23:59:59.000Z

463

Depositional environment and hydrodynamic flow in Guadalupian Cherry Canyon sandstone, West Ford and West Geraldine fields, Delaware Basin, Texas  

E-Print Network [OSTI]

and entrapment of hydrocarbons. Delaware Mountain Group sediments are currently generating oil. Decementation enhances the reservoir by the formation of secondary porosity. The reservoir sandstones have an aver age porosity of 26$ and an aver age permeability... of 24 md. Oil accumulates in stratigraphic traps located along the updip meander loops of tur bidite channels. A tilted oil/water contact in West Ford and West Ger aldine fields indicates that hydrodynamic flow is pr esent. Heads calculated...

Linn, Anne Marie

2012-06-07T23:59:59.000Z

464

Energy Flow Energy Flow Energy Flow A.Ukleja, T.Tymieniecka, I.Skillicorn 1 Azimuthal asymmetry  

E-Print Network [OSTI]

Energy Flow Energy Flow Energy Flow A.Ukleja, T.Tymieniecka, I.Skillicorn 1 Azimuthal asymmetry using energy flow method Azimuthal angle distribution at Q2 >100 GeV2 Energy flow method.Ukleja on behalf of the ZEUS Collaboration #12; Energy Flow Energy Flow Energy Flow A.Ukleja, T.Tymieniecka, I

465

Two-phase flow studies  

SciTech Connect (OSTI)

The two-phase flow program is directed at understanding the hydrodynamics of two-phase flows. The two-phase flow regime is characterized by a series of flow patterns that are designated as bubble, slug, churn, and annular flow. Churn flow has received very little scientific attention. This lack of attention cannot be justified because calculations predict that the churn flow pattern will exist over a substantial portion of the two-phase flow zone in producing geothermal wells. The University of Houston is experimentally investigating the dynamics of churn flow and is measuring the holdup over the full range of flow space for which churn flow exists. These experiments are being conducted in an air/water vertical two-phase flow loop. Brown University has constructed and is operating a unique two-phase flow research facility specifically designed to address flow problems of relevance to the geothermal industry. An important feature of the facility is that it is dedicated to two-phase flow of a single substance (including evaporation and condensation) as opposed to the case of a two-component two-phase flow. This facility can be operated with horizontal or vertical test sections of constant diameter or with step changes in diameter to simulate a geothermal well profile.

Hanold, R.J.

1983-12-01T23:59:59.000Z

466

Evaluation of flow hood measurements for residential register flows  

SciTech Connect (OSTI)

Flow measurement at residential registers using flow hoods is becoming more common. These measurements are used to determine if the HVAC system is providing adequate comfort, appropriate flow over heat exchangers and in estimates of system energy losses. These HVAC system performance metrics are determined by using register measurements to find out if individual rooms are getting the correct airflow, and in estimates of total air handler flow and duct air leakage. The work discussed in this paper shows that commercially available flow hoods are poor at measuring flows in residential systems. There is also evidence in this and other studies that flow hoods can have significant errors even when used on the non-residential systems they were originally developed for. The measurement uncertainties arise from poor calibrations and the sensitivity of exiting flow hoods to non-uniformity of flows entering the device. The errors are usually large--on the order of 20% of measured flow, which is unacceptably high for most applications. Active flow hoods that have flow measurement devices that are insensitive to the entering airflow pattern were found to be clearly superior to commercially available flow hoods. In addition, it is clear that current calibration procedures for flow hoods may not take into account any field application problems and a new flow hood measurement standard should be developed to address this issue.

Walker, I.S.; Wray, C.P.; Dickerhoff, D.J.; Sherman, M.H.

2001-09-01T23:59:59.000Z

467

Flow Test | Open Energy Information  

Open Energy Info (EERE)

Flow Test Flow Test Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Flow Test Details Activities (38) Areas (33) Regions (1) NEPA(3) Exploration Technique Information Exploration Group: Downhole Techniques Exploration Sub Group: Well Testing Techniques Parent Exploration Technique: Well Testing Techniques Information Provided by Technique Lithology: Stratigraphic/Structural: Hydrological: Flow tests provide information on permeability, recharge rates, reservoir pressures, fluid chemistry, and scaling. Thermal: Flow tests can measure temperature variations with time to estimate characteristics about the heat source. Dictionary.png Flow Test: Flow tests are typically conducted shortly after a well has been drilled to test its productivity. The well is opened and fluids are released, the

468

Particle trap to sheath contact for a gas-insulated transmission line having a corrugated outer conductor  

DOE Patents [OSTI]

A particle trap to outer elongated conductor or sheath contact for gas-insulated transmission lines. The particle trap to outer sheath contact of the invention is applicable to gas-insulated transmission lines having either corrugated or non-corrugated outer sheaths. The contact of the invention includes an electrical contact disposed on a lever arm which in turn is rotatably disposed on the particle trap and biased in a direction to maintain contact between the electrical contact and the outer sheath.

Fischer, William H. (Pittsburgh, PA); Cookson, Alan H. (Pittsburgh, PA); Yoon, Kue H. (Pittsburgh, PA)

1984-04-10T23:59:59.000Z

469

Particle trap to sheath non-binding contact for a gas-insulated transmission line having a corrugated outer conductor  

DOE Patents [OSTI]

A non-binding particle trap to outer sheath contact for use in gas insulated transmission lines having a corrugated outer conductor. The non-binding feature of the contact according to the teachings of the invention is accomplished by having a lever arm rotatably attached to a particle trap by a pivot support axis disposed parallel to the direction of travel of the inner conductor/insulator/particle trap assembly.

Fischer, William H. (Pittsburgh, PA)

1984-04-24T23:59:59.000Z

470

The uses of electron beam ion traps in the study of highly charged ions  

SciTech Connect (OSTI)

The Electron Beam Ion Trap (EBIT) is a relatively new tool for the study of highly charged ions. Its development has led to a variety of new experimental opportunities; measurements have been performed with EBITs using techniques impossible with conventional ion sources or storage rings. In this paper, I will highlight the various experimental techniques we have developed and the results we have obtained using the EBIT and higher-energy Super-EBIT built at the Lawrence Livermore National Laboratory. The EBIT employs a high-current-density electron beam to trap, ionize, and excite a population of ions. The ions can be studied in situ or extracted from the trap for external experiments. The trapped ions form an ionization-state equilibrium determined by the relative ionization and recombination rates. Ions of several different elements may simultaneously be present in the trap. The ions are nearly at rest, and, for most systems, all in their ground-state configurations. The electron-ion interaction energy has a narrow distribution and can be varied over a wide range. We have used the EBIT devices for the measurement of electron-ion interactions, ion structure, ion-surface interactions, and the behavior of low-density plasmas.

Knapp, D.

1994-11-02T23:59:59.000Z

471

Trapping volumetric measurement by multidetector CT in chronic obstructive pulmonary disease: Effect of CT threshold  

SciTech Connect (OSTI)

Purpose: The purpose of this study was to evaluate the effect of various computed tomography (CT) thresholds on trapping volumetric measurements by multidetector CT in chronic obstructive pulmonary disease (COPD).Methods: Twenty-three COPD patients were scanned with a 64-slice CT scanner in both the inspiratory and expiratory phase. CT thresholds of ?950 Hu in inspiration and ?950 to ?890 Hu in expiration were used, after which trapping volumetric measurements were made using computer software. Trapping volume percentage (Vtrap%) under the different CT thresholds in the expiratory phase and below ?950 Hu in the inspiratory phase was compared and correlated with lung function.Results: Mean Vtrap% was similar under ?930 Hu in the expiratory phase and below ?950 Hu in the inspiratory phase, being 13.18 9.66 and 13.95 6.72 (both lungs), respectively; this difference was not significant (P= 0.240). Vtrap% under ?950 Hu in the inspiratory phase and below the ?950 to ?890 Hu threshold in the expiratory phase was moderately negatively correlated with the ratio of forced expiratory volume in one second to forced vital capacity and the measured value of forced expiratory volume in one second as a percentage of the predicted value.Conclusions: Trapping volumetric measurement with multidetector CT is a promising method for the quantification of COPD. It is important to know the effect of various CT thresholds on trapping volumetric measurements.

Wang, Xiaohua; Yuan, Huishu [Department of Radiology, Peking University Third Hospital, Beijing 100191 (China)] [Department of Radiology, Peking University Third Hospital, Beijing 100191 (China); Duan, Jianghui [Medical School, Peking University, Beijing 100191 (China)] [Medical School, Peking University, Beijing 100191 (China); Du, Yipeng; Shen, Ning; He, Bei [Department of Respiration Internal Medicine, Peking University Third Hospital, Beijing 100191 (China)] [Department of Respiration Internal Medicine, Peking University Third Hospital, Beijing 100191 (China)

2013-08-15T23:59:59.000Z

472

In-trap decay spectroscopy with the TITAN facility at TRIUMF  

E-Print Network [OSTI]

A novel in-trap decay spectroscopy facility has been developed and constructed for use with TRIUMF's Ion Trap for Atomic and Nuclear science (TITAN). This apparatus consists of an open-access spectroscopy ion-trap, which is surrounded radially with up to seven low-energy planar Si(Li) detectors. The ion-trap environment allows for the detection of low-energy photons by providing backing-free storage of the radioactive ions, while guiding decay particles from the trap center via the strong (up to 6 T) magnetic field. Excellent ion confinement is also facilitated by the use of an intense electron beam which provides storage times of minutes or more without ion loss. These advantages, along with careful monitoring and control, provide a significant increase in sensitivity for the detection of X-rays from the electron-capture process. The design, development, and commissioning of this apparatus are presented and the future of the device and experimental technique are discussed.

Leach, K G; Lennarz, A; Brunner, T; Gallant, A T; Good, M; Klawitter, R; Kwiatkowski, A A; Ma, T; Macdonald, T D; Seeraji, S; Simon, M C; Andreoiu, C; Dilling, J; Frekers, D

2014-01-01T23:59:59.000Z

473

In-trap decay spectroscopy with the TITAN facility at TRIUMF  

E-Print Network [OSTI]

A novel in-trap decay spectroscopy facility has been developed and constructed for use with TRIUMF's Ion Trap for Atomic and Nuclear science (TITAN). This apparatus consists of an open-access spectroscopy ion-trap, which is surrounded radially with up to seven low-energy planar Si(Li) detectors. The ion-trap environment allows for the detection of low-energy photons by providing backing-free storage of the radioactive ions, while guiding decay particles from the trap center via the strong (up to 6 T) magnetic field. Excellent ion confinement is also facilitated by the use of an intense electron beam which provides storage times of minutes or more without ion loss. These advantages, along with careful monitoring and control, provide a significant increase in sensitivity for the detection of X-rays from the electron-capture process. The design, development, and commissioning of this apparatus are presented and the future of the device and experimental technique are discussed.

K. G. Leach; A. Grossheim; A. Lennarz; T. Brunner; J. R. Crespo Lpez-Urrutia; A. T. Gallant; M. Good; R. Klawitter; A. A. Kwiatkowski; T. Ma; T. D. Macdonald; S. Seeraji; M. C. Simon; C. Andreoiu; J. Dilling; D. Frekers

2014-05-28T23:59:59.000Z

474

Electrocapturing flow cell  

DOE Patents [OSTI]

A flow cell for electrophoretically-assisted capturing analytes from a flow. The flow cell includes a specimen chamber, a first membrane, a second membrane, a first electrode chamber, and a second electrode chamber. The specimen chamber may have a sample inlet and a sample outlet. A first portion of the first membrane may be coupled to a first portion of the specimen chamber. A first portion of the second membrane may be coupled to a second portion of the specimen chamber. The first electrode chamber may be configured to accept a charge. A portion of the first electrode chamber may be coupled to a second portion of the first membrane. A second electrode chamber may be configured to accept an opposite charge. A portion of the second electrode chamber may be coupled to a second portion of the second membrane.

Morozov, Victor (Manassas, VA)

2011-04-05T23:59:59.000Z

475

Workshop on hypersonic flow  

SciTech Connect (OSTI)

An overview is given of research activity on the application of computational fluid dynamics (CDF) for hypersonic propulsion systems. After the initial consideration of the highly integrated nature of air-breathing hypersonic engines and airframe, attention is directed toward computations carried out for the components of the engine. A generic inlet configuration is considered in order to demonstrate the highly three dimensional viscous flow behavior occurring within rectangular inlets. Reacting flow computations for simple jet injection as well as for more complex combustion chambers are then discussed in order to show the capability of viscous finite rate chemical reaction computer simulations. Finally, the nozzle flow fields are demonstrated, showing the existence of complex shear layers and shock structure in the exhaust plume. The general issues associated with code validation as well as the specific issue associated with the use of CFD for design are discussed. A prognosis for the success of CFD in the design of future propulsion systems is offered.

Povinelli, L.A.

1990-01-01T23:59:59.000Z

476

Understanding the Distributed Intra-Catalyst Impact of Sulfation on Water Gas Shift in a Lean NOx Trap Catalyst  

Broader source: Energy.gov [DOE]

The Lean NOx Trap catalyst is an aftertreatment technology for abatement of nitrogen-oxide emissions from lean-burn vehicle engines.

477

Multiphase cooling flows  

E-Print Network [OSTI]

I discuss the multiphase nature of the intracluster medium whose neglect can lead to overestimates of the baryon fraction of clusters by up to a factor of two. The multiphase form of the cooling flow equations are derived and reduced to a simple form for a wide class of self-similar density distributions. It is shown that steady-state cooling flows are \\emph{not} consistent with all possible emissivity profiles which can therefore be used as a test of the theory. In combination, they provide strong constraints on the mass distribution within the cooling radius.

Peter A. Thomas

1996-08-20T23:59:59.000Z

478

Does Water Content or Flow Rate Control Colloid Transport in Unsaturated Porous Media?  

SciTech Connect (OSTI)

Mobile colloids can play an important role in contaminant transport in soils: many contaminants exist in colloidal form, and colloids can facilitate transport of otherwise immobile contaminants. In unsaturated soils, colloid transport is, among other factors, affected by water content and flow rate. Our objective was to determine whether water content or flow rate is more important for colloid transport. We passed negatively charged polystyrene colloids (220 nm diameter) through unsaturated sand-filled columns under steady-state flow at different water contents (effective water saturations Se ranging from 0.1 to 1.0, with Se = (? ?r)/(?s ?r)) and flow rates (pore water velocities v of 5 and 10 cm/min). Water content was the dominant factor in our experiments. Colloid transport decreased with decreasing water content, and below a critical water content (Se < 0.1), colloid transport was inhibited, and colloids were strained in water films. Pendular ring and water film thickness calculations indicated that colloids can move only when pendular rings are interconnected. The flow rate affected retention of colloids in the secondary energy minimum, with less colloids being trapped when the flow rate increased. These results confirm the importance of both water content and flow rate for colloid transport in unsaturated porous media and highlight the dominant role of water content.

Thorsten Knappenberger; Markus Flury; Earl D. Mattson; James B. Harsh

2014-03-01T23:59:59.000Z

479

Volume 13, Number 5 Q05001, doi:10.1029/2011GC004016  

E-Print Network [OSTI]

of Geosciences, University of Panama, Panama City, Panama [1] Lava flow mapping is both an essential component

480

Electron and hole transport to trap groups at the ends of conjugated  

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

and hole transport to trap groups at the ends of conjugated and hole transport to trap groups at the ends of conjugated polyfluorenes Sadayuki Asaoka, Norihiko Takeda, Tornokazu Lyoda, Andrew R. Cook and John R. Miller J. Am. Chem. Soc. 130, 11912-11920 (2008). [Find paper at ACS Publications] Abstract: Electrons and holes were injected selectively into poly-2,7-(9,9-dihexylfluorene) (pF) dissolved in a tetrahydrofuran (THF) and a 1,2-dichloroethane (DCE) solution, respectively, using pulse radiolysis. Transient absorption spectra of monoions of both signs revealed two bands attributable to formation of polarons, one in the visible region (pF+* at 580 nm, pF-* at 600 nm) and another in the near-IR region. Polyfluorenes (pF) were synthesized having anthraquinone (AQ) or naphtylimide (NI) end caps that trap electrons or di-p-tolylaminophenyl

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481

Trapping the Light Fantastic | U.S. DOE Office of Science (SC)  

Office of Science (SC) Website

Trapping the Light Fantastic Trapping the Light Fantastic Discovery & Innovation Stories of Discovery & Innovation Brief Science Highlights SBIR/STTR Highlights Contact Information Office of Science U.S. Department of Energy 1000 Independence Ave., SW Washington, DC 20585 P: (202) 586-5430 07.07.11 Trapping the Light Fantastic New solar cell design uses advanced optics and nanotechnology to maximize performance and minimize cost. Discovery moves from lab bench to initial commercial scale-up inside a year. Print Text Size: A A A Subscribe FeedbackShare Page Click to enlarge photo. Enlarge Photo A 3-D graphic showing Si wires, transparent polymer, light-scattering particles, anti-reflective coating and back-reflector Image courtesy of California Institute of Technology Schematic of Atwater team's silicon nanowire solar cell.

482

Geek-Up[11.19.2010]: Molecular Stencils, GRETINA and Trapped Antimatter |  

Broader source: Energy.gov (indexed) [DOE]

Geek-Up[11.19.2010]: Molecular Stencils, GRETINA and Trapped Geek-Up[11.19.2010]: Molecular Stencils, GRETINA and Trapped Antimatter Geek-Up[11.19.2010]: Molecular Stencils, GRETINA and Trapped Antimatter November 19, 2010 - 5:16pm Addthis An optical micrograph of a polymer film that self-assembles into ordered nanoscale structures. | Photo Courtesy of Argonne National Laboratory An optical micrograph of a polymer film that self-assembles into ordered nanoscale structures. | Photo Courtesy of Argonne National Laboratory Niketa Kumar Niketa Kumar Public Affairs Specialist, Office of Public Affairs At Argonne National Laboratory, scientists have developed a technique that may lead to more efficient, lower cost solar energy technologies. Argonne nanoscientist Seth Darling and chemist Jeff Elam have engineered a method

483

Photoluminescence Blinking Dynamics of Colloidal Quantum Dots in the Presence of Controlled External Electron Traps  

SciTech Connect (OSTI)

The effect of the external charge trap on the photoluminescence blinking dynamics of individual colloidal quantum dots is investigated with a series of colloidal quantum dot-bridge-fullerene dimers with varying bridge lengths, where the fullerene moiety acts as a well-defined, well-positioned external charge trap. It is found that charge transfer followed by charge recombination is an important mechanism in determining the blinking behavior of quantum dots when the external trap is properly coupled with the excited state of the quantum dot, leading to a quasi-continuous distribution of 'on' states and an early fall-off from a power-law distribution for both 'on' and 'off' times associated with quantum dot photoluminescence blinking.

Cotlet, M.; Xu, Z.

2012-01-23T23:59:59.000Z

484

The laser ion source trap for highest isobaric selectivity in online exotic isotope production  

SciTech Connect (OSTI)

The improvement in the performance of a conventional laser ion source in the laser ion source and trap (LIST) project is presented, which envisages installation of a repeller electrode and a linear Paul trap/ion guide structure. This approach promises highest isobaric purity and optimum temporal and spatial control of the radioactive ion beam produced at an online isotope separator facility. The functionality of the LIST was explored at the offline test separators of University of Mainz (UMz) and ISOLDE/CERN, using the UMz solid state laser system. Ionization efficiency and selectivity as well as time structure and transversal emittance of the produced ion beam was determined. Next step after complete characterization is the construction and installation of the radiation-hard final trap structure and its first online application.

Schwellnus, F.; Gottwald, T.; Mattolat, C.; Wendt, K. [Institut fuer Physik, Johannes Gutenberg-Universitaet, D-55099 Mainz (Germany); Blaum, K. [Max-Planck-Institut fuer Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg (Germany); Catherall, R.; Crepieux, B.; Fedosseev, V.; Marsh, B.; Rothe, S.; Stora, T. [CERN, CH-1211 Geneva 23 (Switzerland); Kluge, H.-J. [GSI, Planckstrasse 1, D-64291 Darmstadt (Germany)

2010-02-15T23:59:59.000Z

485

Simulation of a quantum phase transition of polaritons with trapped ions  

Science Journals Connector (OSTI)

We present a system for the simulation of quantum phase transitions of collective internal qubit and phononic states with a linear crystal of trapped ions. The laser-ion interaction creates an energy gap in the excitation spectrum, which induces an effective phonon-phonon repulsion and a Jaynes-Cummings-Hubbard interaction. This system shows features equivalent to phase transitions of polaritons in coupled cavity arrays. Trapped ions allow for easy tuning of the hopping frequency by adjusting the axial trapping frequency and the phonon-phonon repulsion via laser detuning and intensity. We propose an experimental protocol to access all observables of the system, which allows one to obtain signatures of the quantum phase transitions even with a small number of ions.

P. A. Ivanov; S. S. Ivanov; N. V. Vitanov; A. Mering; M. Fleischhauer; K. Singer

2009-12-03T23:59:59.000Z

486

Simulation of a quantum phase transition of polaritons with trapped ions  

E-Print Network [OSTI]

We present a novel system for the simulation of quantum phase transitions of collective internal qubit and phononic states with a linear crystal of trapped ions. The laser-ion interaction creates an energy gap in the excitation spectrum, which induces an effective phonon-phonon repulsion and a Jaynes-Cummings-Hubbard interaction. This system shows features equivalent to phase transitions of polaritons in coupled cavity arrays. Trapped ions allow for easy tunabilty of the hopping frequency by adjusting the axial trapping frequency, and the phonon-phonon repulsion via the laser detuning and intensity. We propose an experimental protocol to access all observables of the system, which allows one to obtain signatures of the quantum phase transitions even with a small number of ions.

P. A. Ivanov; S. S. Ivanov; N. V. Vitanov; A. Mering; M. Fleischhauer; K. Singer

2009-05-15T23:59:59.000Z

487

A cryogenic surface-electrode elliptical ion trap for quantum simulation  

E-Print Network [OSTI]

Two-dimensional crystals of trapped ions are a promising system with which to implement quantum simulations of challenging problems such as spin frustration. Here, we present a design for a surface-electrode elliptical ion trap which produces a 2-D ion crystal and is amenable to microfabrication, which would enable higher simulated coupling rates, as well as interactions based on magnetic forces generated by on-chip currents. Working in an 11 K cryogenic environment, we experimentally verify to within 5% a numerical model of the structure of ion crystals in the trap. We also explore the possibility of implementing quantum simulation using magnetic forces, and calculate J-coupling rates on the order of 10^3 / s for an ion crystal height of 10 microns, using a current of 1 A.

Robert J. Clark; Ziliang Lin; Kenan S. Diab; Isaac L. Chuang

2010-08-31T23:59:59.000Z

488

Tapered optical fibers as tools for probing magneto-optical trap characteristics  

SciTech Connect (OSTI)

We present a novel technique for measuring the characteristics of a magneto-optical trap (MOT) for cold atoms by monitoring the spontaneous emission from trapped atoms coupled into the guided mode of a tapered optical nanofiber. We show that the nanofiber is highly sensitive to very small numbers of atoms close to its surface. The size and shape of the MOT, determined by translating the cold atom cloud across the tapered fiber, is in excellent agreement with measurements obtained using the conventional method of fluorescence imaging using a charge coupled device camera. The coupling of atomic fluorescence into the tapered fiber also allows us to monitor the loading and lifetime of the trap. The results are compared to those achieved by focusing the MOT fluorescence onto a photodiode and it was seen that the tapered fiber gives slightly longer loading and lifetime measurements due to the sensitivity of the fiber, even when very few atoms are present.

Morrissey, Michael J.; Deasy, Kieran [Department of Applied Physics and Instrumentation, Cork Institute of Technology, Cork (Ireland); Photonics Centre, Tyndall National Institute, University College Cork, Prospect Row, Cork (Ireland); Wu Yuqiang; Nic Chormaic, Sile [Photonics Centre, Tyndall National Institute, University College Cork, Prospect Row, Cork (Ireland); Department of Physics, University College Cork, Cork (Ireland); Chakrabarti, Shrabana [Photonics Centre, Tyndall National Institute, University College Cork, Prospect Row, Cork (Ireland)

2009-05-15T23:59:59.000Z

489

Characteristics of the electron traps produced by electron irradiation in n-type germanium  

Science Journals Connector (OSTI)

The free energies of ionization, the emission rates, and the cross sections for electron trapping have been measured for the four majority carrier traps which are produced in n-type germanium by electron irradiation at room temperature and which are stable at this temperature. These traps, labeled E1, E2, E4, and E5, which exhibit an emission rate of 140 s-1 at 145, 200, 185, and 170 K, are situated at 260, 410, 380, and 370 meV below the conduction band, respectively. The variations of the electron-capture cross sections versus temperature, characterized by the following activation energies: 65, 120, 80, and 50 meV, respectively, indicate that nonradiation recombination occurs through multiphonon emission. From the values of the free energies of ionization and from the variation of the emission rates with temperature, the enthalpies and entropies of ionization have been deduced.

F. Poulin and J. C. Bourgoin

1982-12-15T23:59:59.000Z

490

Enhanced Efficiency of Light-Trapping Nanoantenna Arrays for Thin Film Solar Cells  

E-Print Network [OSTI]

We suggest a novel concept of efficient light-trapping structures for thin-film solar cells based on arrays of planar nanoantennas operating far from plasmonic resonances. The operation principle of our structures relies on the excitation of chessboard-like collective modes of the nanoantenna arrays with the field localized between the neighboring metal elements. We demonstrated theoretically substantial enhancement of solar-cell short-circuit current by the designed light-trapping structure in the whole spectrum range of the solar-cell operation compared to conventional structures employing anti-reflecting coating. Our approach provides a general background for a design of different types of efficient broadband light-trapping structures for thin-film solar-cell technologically compatible with large-area thin-film fabrication techniques.

Simovski, Constantin R; Voroshilov, Pavel M; Guzhva, Michael E; Belov, Pavel A; Kivshar, Yuri S

2013-01-01T23:59:59.000Z

491

Angular Distribution of Photoluminescence as a Probe of Bose Condensation of Trapped Excitons  

Science Journals Connector (OSTI)

Recent experiments on two-dimensional exciton systems have shown that excitons collect in shallow in-plane traps. We find that Bose condensation in a trap results in a dramatic change of the exciton photoluminescence (PL) angular distribution. The long-range coherence of the condensed state gives rise to a sharply focused peak of radiation in the direction normal to the plane. By comparing the PL profile with and without Bose condensation, we provide a simple diagnostic for the existence of a Bose condensate. The PL peak has strong temperature dependence due to the thermal order parameter phase fluctuations across the system. The angular PL distribution can also be used for imaging vortices in the trapped condensate. Vortex phase spatial variation leads to destructive interference of PL radiation in certain directions, creating nodes in the PL distribution that imprint the vortex configuration.

Jonathan Keeling, L. S. Levitov, and P. B. Littlewood

2004-04-27T23:59:59.000Z

492

Finite-geometry models of electric field noise from patch potentials in ion traps  

SciTech Connect (OSTI)

We model electric field noise from fluctuating patch potentials on conducting surfaces by taking into account the finite geometry of the ion trap electrodes to gain insight into the origin of anomalous heating in ion traps. The scaling of anomalous heating rates with surface distance d is obtained for several generic geometries of relevance to current ion trap designs, ranging from planar to spheroidal electrodes. The influence of patch size is studied both by solving Laplace's equation in terms of the appropriate Green's function as well as through an eigenfunction expansion. Scaling with surface distance is found to be highly dependent on the choice of geometry and the relative scale between the spatial extent of the electrode, the ion-electrode distance, and the patch size. Our model generally supports the d{sup -4} dependence currently found by most experiments and models, but also predicts geometry-driven deviations from this trend.

Low, Guang Hao [MIT-Harvard Center for Ultracold Atoms, Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States); Department of Physics, Cavendish Laboratory, J. J. Thomson Avenue, Cambridge, CB3 0HE (United Kingdom); Herskind, Peter F.; Chuang, Isaac L. [MIT-Harvard Center for Ultracold Atoms, Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)

2011-11-15T23:59:59.000Z

493

Geek-Up[11.19.2010]: Molecular Stencils, GRETINA and Trapped Antimatter |  

Broader source: Energy.gov (indexed) [DOE]

Geek-Up[11.19.2010]: Molecular Stencils, GRETINA and Trapped Geek-Up[11.19.2010]: Molecular Stencils, GRETINA and Trapped Antimatter Geek-Up[11.19.2010]: Molecular Stencils, GRETINA and Trapped Antimatter November 19, 2010 - 5:16pm Addthis An optical micrograph of a polymer film that self-assembles into ordered nanoscale structures. | Photo Courtesy of Argonne National Laboratory An optical micrograph of a polymer film that self-assembles into ordered nanoscale structures. | Photo Courtesy of Argonne National Laboratory Niketa Kumar Niketa Kumar Public Affairs Specialist, Office of Public Affairs At Argonne National Laboratory, scientists have developed a technique that may lead to more efficient, lower cost solar energy technologies. Argonne nanoscientist Seth Darling and chemist Jeff Elam have engineered a method

494

Multiphase Flow in Complex Fracture Apertures Under a Wide Range of Flow Conditions  

SciTech Connect (OSTI)

The summary below is an update of our previous progress report of June, 2003. That previous progress report, which was submitted as a PDF document, is not recorded on the RIMS website but will appear on the EMSP website. Our recent results are in the following areas: (1) Single-component flow through a rough-walled fracture to validate our methods, we have simulated slow single-component fluid flow through a geometry taken from analogous laboratory experiments. The permeability of this fracture is studied as the direction of the driving force is changed. We find that the lattice-Boltzmann method agrees with the experimental data and with previous numerical efforts. Additionally, flow enhancement compared to the well-known cubic law is observed in certain directions, i.e., the direction in which channels are most strongly correlated. Conversely, flow inhibition is observed in the perpendicular direction. Fluid flow appears to follow the correlated channels. We are currently extending these studies to higher Reynolds numbers where classical approximations based on assumptions of slow creeping flow are no longer valid. (2) Capillary rise in simple and complex geometries Capillary rise is studied using the lattice-Boltzmann method. The geometries used are a circular tube, a rectangular tube, and a fracture between two rough walls. The capillary rise height and the shape of the interface is studied as a function of the size of the tube, the wetting tendency of the walls, the surface tension, and the magnitude of an applied body force. In performing this study we discovered a technical problem with the lattice-Boltzmann method: it exhibited lattice pinning. This pinning created two significant problems: the entrapment of small bubbles and a history dependence of the contact angle. We solved these problems by modifying our algorithm so that it now allows interfaces to move at a smaller velocity. The new method practically removes all effects of lattice pinning. For the case of rectangular tubes, we have shown that the shape of the interface follows theoretical predictions and that the pressure drop across the interface obeys Laplace's law. Consequently our improved method solves a significant problem encountered in lattice-Boltzmann simulations of drainage and imbibition. We are presently pursuing analogous studies in more complex geometries. (3) Macroscopic laws for two-component fluid flow through rough fractures. Macroscopic two-phase flow through porous media is commonly approximated by a generalization of Darcy's law, wherein ''relative permeability's'' represent the mobility of wetting and non-wetting fluids. We have recently begun studying the applicability of this approximation for two-phase flow through rough-walled fractures. We find that when the nonwetting fluid is unconnected it can become trapped in tight geometries. Once forcing exceeds a certain capillary threshold the non-wetting fluid starts to move again. This capillary threshold depends on the roughness of the fracture surface and the size of the fracture aperture. Further simulations are being performed to better specify these dependencies along with the relationship of relative permeability to fracture roughness. (4) Multiple relaxation-time lattice-Boltzmann method. We are exploring ways to use the lattice-Boltzmann method in a rectangular lattice with different spacing in one direction. This idea is motivated by the fact that self-affine fracture surfaces exhibit different scaling perpendicular to the plane of the fracture than they exhibit in the plane. Therefore, allowing different lattice spacing in the different directions should greatly increase the efficiency of our simulations. We also seek a practical way of solving a well-known problem that derives from using the ''bounce-back'' method to approximate no-slip boundary conditions. We are pursuing a new generalization of the ''multiple relaxation time generalized lattice-Boltzmann method'' and are in the process of implementing it. (5) Study of thermal fluctuations of fluid-fluid interfaces. We hav

Rothman, Daniel H.

2003-06-01T23:59:59.000Z

495

Coherent structures in ion temperature gradient turbulence-zonal flow  

SciTech Connect (OSTI)

Nonlinear stationary structure formation in the coupled ion temperature gradient (ITG)-zonal flow system is investigated. The ITG turbulence is described by a wave-kinetic equation for the action density of the ITG mode, and the longer scale zonal mode is described by a dynamic equation for the m?=?n?=?0 component of the potential. Two populations of trapped and untrapped drift wave trajectories are shown to exist in a moving frame of reference. This novel effect leads to the formation of nonlinear stationary structures. It is shown that the ITG turbulence can self-consistently sustain coherent, radially propagating modulation envelope structures such as solitons, shocks, and nonlinear wave trains.

Singh, Rameswar, E-mail: rameswar.singh@lpp.polytechnique.fr [Laboratoire de Physique des Plasmas, Ecole Polytechnique, Route de Saclay, 91128 Palaiseau Cedex (France); Institute for Plasma Research, Bhat, Gandhinagar 382 428 (India); Singh, R. [Institute for Plasma Research, Bhat, Gandhinagar 382 428 (India); WCI Center for Fusion Theory, National Fusion Research Institute, Daejeon 305-333 (Korea, Republic of); Kaw, P. [Institute for Plasma Research, Bhat, Gandhinagar 382 428 (India); Grcan, . D. [Laboratoire de Physique des Plasmas, Ecole Polytechnique, Route de Saclay, 91128 Palaiseau Cedex (France); Diamond, P. H. [WCI Center for Fusion Theory, National Fusion Research Institute, Daejeon 305-333 (Korea, Republic of); CMTFO and CASS, University of California, San Diego, California 92093 (United States)

2014-10-15T23:59:59.000Z

496

Planetary heat flow measurements  

Science Journals Connector (OSTI)

...ESA's Rosetta mission towards comet Churyumov-Gerasimenko. It...Heat flow measurements on comets have a different motivation...penetrator is by no means limited to comets; it has also been tested in...measurement. Currently, a landing on Mercury within the framework...

2005-01-01T23:59:59.000Z

497

The Flow of Water  

Science Journals Connector (OSTI)

... for ice-covered streams become of very great importance wlieii a stream is required for hydroelectric power production. An appendix is attached of fifty - two well- selected problems relating ... The remaining chapters dealing with flow in pipes and channels and with centrifugal pumps and turbines call for no particular comment. It is of interest to find a chapter dealing ...

1927-12-31T23:59:59.000Z

498

ENERGY FLOWS CLIMATE CHANGE  

E-Print Network [OSTI]

absorption of solar radiation. #12;AEROSOLS AS SEEN FROM SPACE Fire plumes from southern Mexico transportedENERGY FLOWS FORCINGS CLIMATE CHANGE A REALLY TOUGH PROBLEM Stephen E. Schwartz, BNL, 7-20-11 www average temperature 15°C or 59°F #12;ATMOSPHERIC RADIATION Power per area Energy per time per area Unit

Schwartz, Stephen E.

499

US energy flow, 1991  

SciTech Connect (OSTI)

Trends in energy consumption and assessment of energy sources are discussed. Specific topics discussed include: energy flow charts; comparison of energy use with 1990 and earlier years; supply and demand of fossil fuels (oils, natural gas, coal); electrical supply and demand; and nuclear power.

Borg, I.Y.; Briggs, C.K.

1992-06-01T23:59:59.000Z

500

Tripartite nonlocality and continuous-variable entanglement in thermal states of trapped ions  

SciTech Connect (OSTI)

We study a system of three trapped ions in an anisotropic bidimensional trap. By focusing on the transverse modes of the ions, we show that the mutual ion-ion Coulomb interactions set entanglement of a genuine tripartite nature, to some extent persistent to the thermal nature of the vibronic modes. We tackle this issue by addressing a nonlocality test in the phase space of the ionic system and quantifying the genuine residual tripartite entanglement in the continuous variable state of the transverse modes.

Li Jie; Paternostro, Mauro [School of Mathematics and Physics, Queen's University, Belfast BT7 1NN (United Kingdom); Fogarty, Thomas; Busch, Thomas [Physics Department, University College Cork, Cork (Ireland); Cormick, Cecilia [Theoretische Physik, Universitaet des Saarlandes, D-66041 Saarbruecken (Germany); Goold, John [Physics Department, University College Cork, Cork (Ireland); Clarendon Laboratory, University of Oxford (United Kingdom)

2011-08-15T23:59:59.000Z