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1

Thermochronometry | Open Energy Information  

Open Energy Info (EERE)

Thermochronometry Thermochronometry Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Thermochronometry Details Activities (6) Areas (5) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Geochemical Techniques Exploration Sub Group: Geochemical Data Analysis Parent Exploration Technique: Geochemical Data Analysis Information Provided by Technique Lithology: Stratigraphic/Structural: Hydrological: Thermal: Thermal history of area, rate of cooling, age that minerals reached closure temperature Dictionary.png Thermochronometry: The study of the thermal evolution of a mineral, rock, or geologic region using radiometric dating of two or more different minerals which have different closure temperatures Other definitions:Wikipedia Reegle

2

Thermal Ion Dispersion | Open Energy Information  

Open Energy Info (EERE)

Page Page Edit with form History Facebook icon Twitter icon » Thermal Ion Dispersion Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Thermal Ion Dispersion Details Activities (1) Areas (1) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Geochemical Techniques Exploration Sub Group: Geochemical Data Analysis Parent Exploration Technique: Geochemical Data Analysis Information Provided by Technique Lithology: Stratigraphic/Structural: Hydrological: Thermal: Dictionary.png Thermal Ion Dispersion: Thermal Ion Dispersion (TID) is a method used by the precious-metals industry to determine the movement of hot, mineral-bearing waters through rocks, gravels, and soils. The survey involves collection of soil samples

3

Definition: Thermal Ion Dispersion | Open Energy Information  

Open Energy Info (EERE)

Dispersion Dispersion Jump to: navigation, search Dictionary.png Thermal Ion Dispersion Thermal Ion Dispersion (TID) is a method used by the precious-metals industry to determine the movement of hot, mineral-bearing waters through rocks, gravels, and soils. The survey involves collection of soil samples and analyses of ions by an enzyme leach process done by commercial laboratories. The method utilizes the property of elements to be dissolved, transported, or deposited depending on the temperature of the thermal waters.{{#tag:ref|[[Final Technical Report}}[1][2][3][4] Also Known As enzyme leach References ↑ Geothermal Resource Evaluation And Definitioni (Gred) Program-Phases I ↑ Ii ↑ And Iii For The Animas Valley ↑ Nm Geothermal Resource]] {{#set:Reference URI={{#explode:{{#replace:[[Final Technical Report|[|}}|

4

Thermochronometry At Fish Lake Valley Area (DOE GTP) | Open Energy...  

Open Energy Info (EERE)

Fish Lake Valley Area (DOE GTP) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Thermochronometry At Fish Lake Valley Area (DOE GTP) Exploration...

5

Thermochronometry At Fort Bliss Area (DOE GTP) | Open Energy...  

Open Energy Info (EERE)

(1 January 2011) GTP ARRA Spreadsheet Additional References Retrieved from "http:en.openei.orgwindex.php?titleThermochronometryAtFortBlissArea(DOEGTP)&oldid40...

6

Thermochronometry At Coso Geothermal Area (2003) | Open Energy Information  

Open Energy Info (EERE)

Thermochronometry At Coso Geothermal Area (2003) Thermochronometry At Coso Geothermal Area (2003) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Thermochronometry At Coso Geothermal Area (2003) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Thermochronometry Activity Date 2003 Usefulness not indicated DOE-funding Unknown Exploration Basis Determine the age of the geothermal system and the granitic host rock using the 40Ar/39Ar thermal history Notes A downhole 40Ar/39Ar thermochronology study of granitic host-rock K-feldspar is presently being undertaken at the New Mexico Geochronology Research Laboratory. The technique couples the measurement of argon loss from K-feldspar and knowledge of the diffusion parameters of transport in K-feldspar to estimate the longevity of the system at present day

7

Thermochronometry At Coso Geothermal Area (2010) | Open Energy Information  

Open Energy Info (EERE)

Thermochronometry At Coso Geothermal Area (2010) Thermochronometry At Coso Geothermal Area (2010) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Thermochronometry Activity Date 2010 Usefulness not indicated DOE-funding Unknown Exploration Basis To determine if there is geothermal potential in the South Ranges Notes It has been believed that the South Ranges at China Lake may host geothermal resources for several decades. Recent Garlock Fault mapping, associated thermochronology work and a well documented but geologically unresolved steaming well to the west suggests that the South Ranges should be investigated for geothermal potential. In 2009, GPO awarded a contract to the University of Kansas to follow through on detailed mapping, trenching, dating and thermochronoloy in the Lava Mountains and the

8

Electrostatic dispersion lenses and ion beam dispersion methods  

DOE Patents [OSTI]

An EDL includes a case surface and at least one electrode surface. The EDL is configured to receive through the EDL a plurality of ion beams, to generate an electrostatic field between the one electrode surface and either the case surface or another electrode surface, and to increase the separation between the beams using the field. Other than an optional mid-plane intended to contain trajectories of the beams, the electrode surface or surfaces do not exhibit a plane of symmetry through which any beam received through the EDL must pass. In addition or in the alternative, the one electrode surface and either the case surface or the other electrode surface have geometries configured to shape the field to exhibit a less abrupt entrance and/or exit field transition in comparison to another electrostatic field shaped by two nested, one-quarter section, right cylindrical electrode surfaces with a constant gap width.

Dahl, David A. (Idaho Falls, ID) [Idaho Falls, ID; Appelhans, Anthony D. (Idaho Falls, ID) [Idaho Falls, ID

2010-12-28T23:59:59.000Z

9

Thermochronometry At Raft River Geothermal Area (1993) | Open Energy  

Open Energy Info (EERE)

) ) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Thermochronometry At Raft River Geothermal Area (1993) Exploration Activity Details Location Raft River Geothermal Area Exploration Technique Thermochronometry Activity Date 1993 Usefulness not indicated DOE-funding Unknown Notes Constraints on the initial orientation and crustal position of the shear zone have been derived from 40Ar/39Ar thermochronology of mineral suites (hornblende, muscovite, biotite, and k-feldspar) collected within and beneath the shear zone along a 27 km transect parallel to the transport direction. References Wells, M.L.; Snee, L.W. (1 April 1993) Geologic and thermochronologic constraints on the initial orientation of the Raft River detachment and footwall shear zone

10

Application of (U-Th)/He Thermochronometry as a Geothermal Exploration Tool  

Open Energy Info (EERE)

of (U-Th)/He Thermochronometry as a Geothermal Exploration Tool of (U-Th)/He Thermochronometry as a Geothermal Exploration Tool in Extensional Tectonic Settings: The Wassuk Range, Hawthorne, Nevada Jump to: navigation, search OpenEI Reference LibraryAdd to library Journal Article: Application of (U-Th)/He Thermochronometry as a Geothermal Exploration Tool in Extensional Tectonic Settings: The Wassuk Range, Hawthorne, Nevada Abstract Geothermal exploration in the Basin and Range Province is often focused in extended terrains where heat has been transferred to the surface through advection in the footwall rocks of normal faults. Low temperature (U-Th)/He apatite ages of such footwall rocks can determine which areas have experienced the most recent, significant extension or have interacted with hot geothermal fluids. Apatite cooling ages from the footwall of the Wassuk

11

Thermal Ion Dispersion At Lightning Dock Area (Cunniff & Bowers, 2005) |  

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 » Thermal Ion Dispersion At Lightning Dock Area (Cunniff & Bowers, 2005) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Thermal Ion Dispersion At Lightning Dock Area (Cunniff & Bowers, 2005) Exploration Activity Details Location Lightning Dock Area Exploration Technique Thermal Ion Dispersion Activity Date Usefulness useful DOE-funding Unknown Notes Thermal Ion Dispersion (TID) is a method used by the precious-metals industry to determine the movement of hot, mineral-bearing waters through rocks, gravels, and soils. The survey involves collection of soil samples

12

Kaon dispersion relation and flow in relativistic heavy-ion collisions  

E-Print Network [OSTI]

Within the framework of a relativistic transport model (ART) for heavy-ion collisions at AGS energies, we examine the effects of a kaon dispersion relation on the transverse flow of kaons and their transverse momentum and azimuthal angle...

Li, Ba; Ko, Che Ming.

1996-01-01T23:59:59.000Z

13

Exploring the interaction between lithium ion and defective graphene surface using dispersion corrected DFT studies  

SciTech Connect (OSTI)

To analyze the lithium ion interaction with realistic graphene surfaces, we carried out dispersion corrected DFT-D3 studies on graphene with common point defects and chemisorbed oxygen containing functional groups along with defect free graphene surface. Our study reveals that, the interaction between lithium ion (Li+) and graphene is mainly through the delocalized ? electron of pure graphene layer. However, the oxygen containing functional groups pose high adsorption energy for lithium ion due to the Li-O ionic bond formation. Similarly, the point defect groups interact with lithium ion through possible carbon dangling bonds and/or cation-? type interactions. Overall these defect sites render a preferential site for lithium ions compared with pure graphene layer. Based on these findings, the role of graphene surface defects in lithium battery performance were discussed.

Vijayakumar, M.; Hu, Jian Z.

2013-10-15T23:59:59.000Z

14

Dispersal  

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

Dispersal Dispersal Nature Bulletin No. 675-A April 15, 1978 Forest Preserve District of Cook County George W. Dunne, President Roland F. Eisenbeis, Supt. of Conservation SEED DISPERSAL Plants that scatter their seeds widely have a better chance to survive than those which do not. Different kinds spread their seeds in various special ways. Many seeds ride the wind. Maple seeds spin away like little helicopters with a single wing. In a strong breeze they can travel a city block. Those of the elm are small papery disks with a seed in the center. The ash seed and its wing resembles a canoe paddle. In the basswood a few seeds are suspended beneath a large flat blade that glides through the air. Ripe, dry pine cones open and release winged seeds hidden between the cone scales.

15

Effects of dispersants and soluble counter-ions on aqueous dispersibility of nano-sized zirconia powder  

Science Journals Connector (OSTI)

The effect of different dispersants and water leaching on aqueous dispersibility of zirconia powder was studied. Zeta potentials of aqueous solutions containing nano-sized zirconia powder and different dispersants, such as ammonium polyacrylic acid (PAA-NH4) and tetramethyl ammonium hydroxide (TMAH) and water leaching were characterized. Better dispersion of nano-sized zirconia powder in aqueous solutions was achieved with the addition of dispersant and water leaching.

Zhipeng Xie; Jingtao Ma; Qing Xu; Yong Huang; Yi-Bing Cheng

2004-01-01T23:59:59.000Z

16

Stability of nanoclusters in 14YWT oxide dispersion strengthened steel under heavy ion-irradiation by atom probe tomography  

SciTech Connect (OSTI)

14YWT oxide dispersion strengthened (ODS) ferritic steel was irradiated with of 5 MeV Ni2+ ions, at 300 C, 450 C, and 600 C to a damage level of 100 dpa. The stability of TiYO nanoclusters was investigated by applying atom probe tomography (APT) in voltage mode, of the samples before and after irradiations. The average size and number density of the nanoclusters was determined using the maximum separation method. These techniques allowed for the imaging of nanoclusters to sizes well below the resolution limit of conventional transmission electron microscopy techniques. The most significant changes were observed for samples irradiated at 300 C where the size (average Guinier radius) and number density of nanoclusters were observed to decrease from 1.1 nm to 0.8 nm and 12 1023 to 3.6 1023, respectively. In this study, the nanoclusters are more stable at higher temperature.

Jianchao He; Farong Wan; Kumar Sridharan; Todd R. Allen; A. Certain; V. Shutthanandan; Y.Q. Wu

2014-12-01T23:59:59.000Z

17

Preparation of novel carbon microfiber/carbon nanofiber-dispersed polyvinyl alcohol-based nanocomposite material for lithium-ion electrolyte battery separator  

E-Print Network [OSTI]

December 2012 Keywords: Li-ion battery separator Polyvinyl alcohol Carbon micro-nanofibers Suspension acetate to produce polyvinyl alcohol gel, ball-milling of the surfactant dispersed carbon micro of the polyvinyl alcohol gel formation, and the mixing of hydro- phobic reagents along with polyethylene glycol

Singh, Jayant K.

18

A silicon nanoparticle/reduced graphene oxide composite anode with excellent nanoparticle dispersion to improve lithium ion battery performance  

Science Journals Connector (OSTI)

Composite anodes of Si nanoparticles (SiNPs) and reduced graphene oxide (RGO) sheets with highly dispersed...+...electrochemistry by becoming highly involved in the chargedischarge reaction mechanisms as indicat...

Rhet C. de Guzman; Jinho Yang; Mark Ming-Cheng Cheng

2013-07-01T23:59:59.000Z

19

Dispersant solutions for dispersing hydrocarbons  

DOE Patents [OSTI]

A dispersant solution includes a hydrocarbon dispersing solution derived from a bacterium from ATCC 75527, ATCC 75529, or ATCC 55638.

Tyndall, R.L.

1997-03-11T23:59:59.000Z

20

Preparation of carbon-coated iron oxide nanoparticles dispersed on graphene sheets and applications as advanced anode materials for lithium-ion batteries  

Science Journals Connector (OSTI)

We report a novel chemical vapor deposition (CVD) based strategy to synthesize carbon-coated Fe2O3 nanoparticles dispersed on graphene sheets (Fe2O3@C@G). Graphene sheets with high surface area and aspect...2O3.....

Huilong Fei; Zhiwei Peng; Lei Li; Yang Yang; Wei Lu; Errol L. G. Samuel

2014-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "ion dispersion thermochronometry" 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

Seed Dispersal  

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

Seed Dispersal Seed Dispersal Nature Bulletin No. 35 October 6, 1945 Forest Preserve District of Cook County Clayton F, Smith, President Roberts Mann, Superintendent of Conservation SEED DISPERSAL Plants have various ways of spreading their seeds. Some have "fly-away" seeds. Included are the dandelion, thistle, tumbleweed, cattail, clematis, and many trees. The cottonwood, sycamore, aspen, linden, ailanthus, maple, box elder, birch and the pines are all trees having seeds with wings or with "down", that are carried by winds. Certain aquatic plants have seeds that sink to bury themselves in.the mud beneath the water. Others have seeds that float and are distributed by the winds and currents that carry them away. Many plants "shoot" their seeds, the seed pods popping open with sufficient force to throw the seeds many feet away, Notable in this group are knotgrass, lady slippers, violets, vetches, jewel weed, witch- hazel, and Heavea, the Para rubber tree, The witch-hazel may shoot its seeds 30 or 40 feet.

22

Dispersed Indeterminacy  

E-Print Network [OSTI]

A state of a single particle can be represented by a quantum blob in the corresponding phase space, or by a cell in its 2-D subspace. Its area is frequently stated to be no less than one half of the Plank constant, implying that such a cell is an indivisible quantum of the 2-D phase space. But this is generally not true, as is evident, for instance, from representation of some states in the basis of innately discrete observables like angular momentum. Here we consider some dispersed states involving the evanescent waves (EW) different from that in the total internal reflection. Such states are represented by a set of separated point-like cells, but with a large total indeterminacy. An idealized model has a discrete Wigner function forming an infinite periodic array of dots on the phase plane. The question about the total momentum indeterminacy in such state is discussed. We argue that the transverse momentum eigenstates corresponding to the considered EW-s cannot be singled out by any known measurement procedure, and the whole infinite set of the corresponding eigenvalues can contribute only a certain fraction to the observed momentum indeterminacy which remains finite.

Moses Fayngold

2014-02-05T23:59:59.000Z

23

Exploring the interaction between lithium ion and defective graphene...  

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

Exploring the interaction between lithium ion and defective graphene surface using dispersion corrected DFT studies. Exploring the interaction between lithium ion and defective...

24

Reversible chemisorption on highly dispersed Ru catalysts  

SciTech Connect (OSTI)

Hydrogen and carbon monoxide adsorptions have been studied by static gas volumetric measurement on a range of highly dispersed Y-zeolite-supported ruthenium catalysts prepared by ion exchange. At ambient temperature, the absorption isotherms indicated two distinct types of adsorption - reversible (composed of both physisorption and weak chemisorption) and irreversible (strongly chemisorbed). The catalysts were highly dispersed and had average particle diameters ranging from 0.9 to 1.6 nm. Reversible hydrogen chemisorption was found to be a function of average particle diameter and dispersion. On the other hand, reversible carbon monoxide chemisorption seemed to be mainly due to interaction with the support.

Yang, C.H.; Goodwin, J.G. Jr.

1982-11-01T23:59:59.000Z

25

Chapter 12 - Dispersants  

Science Journals Connector (OSTI)

Three dispersants were prepared to address dispersancy concerns associated with conductive nanotubes, cement, and pigment colorants used in ink jets. In the first case conductive nanotubes were dispersed in water by ultrasounding a mixture of nanotubes with polymeric pyridinium ionic salts. A cement dispersant consisting of a polyether containing polyacrylic acid successfully passed the 15 Hit Flow Rate. Finally ink jet colorants Lithol Rubin and Phthalo were dispersed in water using ethylene-propylene oxide polymers with minimum viscosity increase.

Thomas F. DeRosa

2013-01-01T23:59:59.000Z

26

Dispersion strengthened copper  

DOE Patents [OSTI]

A composition of matter is described which is comprised of copper and particles which are dispersed throughout the copper, where the particles are comprised of copper oxide and copper having a coating of copper oxide. A method for making this composition of matter is also described. This invention relates to the art of powder metallurgy and, more particularly, it relates to dispersion strengthened metals.

Sheinberg, H.; Meek, T.T.; Blake, R.D.

1990-01-09T23:59:59.000Z

27

Ion Cyclotron Waves, Instabilities and Solar Wind Heating  

Science Journals Connector (OSTI)

The effect of alpha particles on the dispersion relation of ion cyclotron waves and its influence on the heating of the solar wind plasma are investigated. ... can dramatically change the dispersion relation of i...

Xing Li; Shadia R. Habbal

2000-01-01T23:59:59.000Z

28

Ion cyclotron waves, instabilities and solar wind heating  

Science Journals Connector (OSTI)

The effect of alpha particles on the dispersion relation of ion cyclotron waves and its influence on the heating of the solar wind plasma are investigated. ... can dramatically change the dispersion relation of i...

Xing Li; Shadia R. Habbal

1999-12-01T23:59:59.000Z

29

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

30

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

31

Dispersion strengthened copper  

DOE Patents [OSTI]

A composition of matter comprised of copper and particles which are dispersed throughout the copper, where the particles are comprised of copper oxide and copper having a coating of copper oxide, and a method for making this composition of matter.

Sheinberg, Haskell (Los Alamos, NM); Meek, Thomas T. (Knoxville, TN); Blake, Rodger D. (Santa Fe, NM)

1990-01-01T23:59:59.000Z

32

Dispersion strengthened copper  

DOE Patents [OSTI]

A composition of matter comprised of copper and particles which are dispersed throughout the copper, where the particles are comprised of copper oxide and copper having a coating of copper oxide, and a method for making this composition of matter.

Sheinberg, Haskell (Los Alamos, NM); Meek, Thomas T. (Knoxville, TN); Blake, Rodger D. (Santa Fe, NM)

1989-01-01T23:59:59.000Z

33

KISMET tungsten dispersal experiment  

SciTech Connect (OSTI)

Results of the KISMET tungsten dispersal experiment indicate a relatively small degree of wall-rock contamination caused by this underground explosive experiment. Designed as an add-on to the KISMET test, which was performed in the U-1a.02 drift of the LYNER facility at Nevada Test Site on 1 March 1995, this experiment involved recovery and analysis of wall-rock samples affected by the high- explosive test. The chemical, high-explosive blast drove tungsten powder, placed around the test package as a plutonium analog, into the surrounding wall- rock alluvium. Sample analyses by an analytical digital electron microscope (ADEM) show tungsten dispersed in the rock as tiny (<10 {mu}m) particles, agglomerates, and coatings on alluvial clasts. Tungsten concentrations, measured by energy dispersive spectral analysis on the ADEM, indicate penetration depths less than 0.1 m and maximum concentrations of 1.5 wt % in the alluvium.

Wohletz, K.; Kunkle, T.; Hawkins, W.

1996-12-01T23:59:59.000Z

34

Determination of dispersivities from a natural-gradient dispersion test  

E-Print Network [OSTI]

, and radioactive wastes. Contaminant hydrogeology is presently a focal point in the realm of hydrologic modeling. Generally, models are designed to represent simplified versions of reality and The style and format of this document was taken from the Journal... dispersivities, v ia a graphical approach, from a natural-gradient dispersion test in which artificial pollution was injected into an aquifer. The dispersion test was conducted by Sud icky et al. (1983) in order to characterize the dispersive properties...

Hoover, Caroline Marie

1985-01-01T23:59:59.000Z

35

Solid electrolytes strengthened by metal dispersions  

DOE Patents [OSTI]

An improvement in solid electrolytes of advanced secondary batteries of the sodium-sulfur, sodium-halogen, and like combinations is achieved by providing said battery with a cermet electrolyte containing a metal dispersion ranging from 0.1 to 10.0 vol. % of a substantially nonreactive metal selected from the group consisting essentially of Pt, Cr, Fe, Co, Ni, Nb, their alloys, and their physical mixtures in the elemental or uncombined state, the remainder of said cermet being an ion-conductive ceramic material.

Lauf, R.J.; Morgan, C.S.

1981-10-05T23:59:59.000Z

36

Solid electrolytes strengthened by metal dispersions  

DOE Patents [OSTI]

An improvement in solid electrolytes of advanced secondary batteries of the sodium-sulfur, sodium-halogen, and like combinations is achieved by providing said battery with a cermet electrolyte containing a metal dispersion ranging from 0.1 to 10.0 vol. % of a substantially nonreactive metal selected from the group consisting essentially of Pt, Cr, Fe, Co, Ni, Nb, their alloys, and their physical mixtures in the elemental or uncombined state, the remainder of said cermet being an ion-conductive ceramic material.

Lauf, Robert J. (Oak Ridge, TN); Morgan, Chester S. (Oak Ridge, TN)

1983-01-01T23:59:59.000Z

37

3, 895923, 2006 Dispersivity behavior  

E-Print Network [OSTI]

in ground-water remediation or protection work. Dispersivity is established as one of the key uncertain

Paris-Sud XI, Université de

38

Nozzle for electric dispersion reactor  

DOE Patents [OSTI]

A nozzle for an electric dispersion reactor includes two concentric electrodes, the inner one of the two delivering disperse phase fluid into a continuous phase fluid. A potential difference generated by a voltage source creates a dispersing electric field at the end of the inner electrode.

Sisson, Warren G. (Oak Ridge, TN); Basaran, Osman A. (Oak Ridge, TN); Harris, Michael T. (Knoxville, TN)

1998-01-01T23:59:59.000Z

39

Nozzle for electric dispersion reactor  

DOE Patents [OSTI]

A nozzle for an electric dispersion reactor includes two concentric electrodes, the inner one of the two delivering disperse phase fluid into a continuous phase fluid. A potential difference generated by a voltage source creates a dispersing electric field at the end of the inner electrode. 4 figs.

Sisson, W.G.; Basaran, O.A.; Harris, M.T.

1998-04-14T23:59:59.000Z

40

Ion source  

DOE Patents [OSTI]

A magnetic filter for an ion source reduces the production of undesired ion species and improves the ion beam quality. High-energy ionizing electrons are confined by the magnetic filter to an ion source region, where the high-energy electrons ionize gas molecules. One embodiment of the magnetic filter uses permanent magnets oriented to establish a magnetic field transverse to the direction of travel of ions from the ion source region to the ion extraction region. In another embodiment, low energy 16 eV electrons are injected into the ion source to dissociate gas molecules and undesired ion species into desired ion species.

Leung, Ka-Ngo (Hercules, CA); Ehlers, Kenneth W. (Alamo, CA)

1984-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ion dispersion thermochronometry" 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

Phonon dispersion in graphene  

E-Print Network [OSTI]

Taking into account the constraints imposed by the lattice symmetry, the phonon dispersion is calculated for graphene with interactions between the first and second nearest neighbors in the framework of the Born-von Karman model. Analytical expressions are obtained for the out-of-plane (bending) modes determined only by two force constants as well as for the in-plane modes with four force constants. Values of the force constants are found in fitting to elastic constants and Raman frequencies observed in graphite.

L. A. Falkovsky

2007-02-17T23:59:59.000Z

42

Phonon dispersion in graphene  

Science Journals Connector (OSTI)

Taking into account constraints imposed by the lattice symmetry we calculate analytically [1] the phonon dispersion for graphene with interactions between first and second neighbors. We find that the out?of?plane (bending) modes are not coupled with in?plane modes and described only with two force constants one of which is determined by the corresponding Raman frequency and another by the smallest elastic constant C44. In contrast to calculations by Saito et al we find the linear dispersion of the bending (out?of?plane) mode around the ? point with a small but finite sound velocity =1.57 km/s. The sound velocity of this mode is very sensitive to small variations of the force constants. The sound velocities of in?plane modes are = 20.3 km/s and =13.1 km/s. Because of the lack of information for graphene we compare the present theory with experiments on graphite. The low phonon frequencies in the critical points turn out less than their values in graphite since the atoms in graphene are more free to move in the out?of?plane direction in comparison with graphite. Accuracy of the comparison can be estimated using the value of the observed splitting of the ZA and ZO' modes in graphite which is around 130 1/cm. [1] L.A. Falkovsky cond?mat/0702409.

Leonid A. Falkovsky

2008-01-01T23:59:59.000Z

43

Nano dispersion amplified waveguide structures  

Science Journals Connector (OSTI)

A highly dispersive waveguide structure is proposed tocefficiently compress and expand ultra short pulses in a package forming a sufficiently small footprint. A sub-wavelength...

Brown, J; Johnson, Eric; Moharam, M

2004-01-01T23:59:59.000Z

44

Environmental Pollution Air Pollution Dispersion Practical Air Pollution Dispersion  

E-Print Network [OSTI]

Environmental Pollution Air Pollution Dispersion 1 of 5 Practical ­ Air Pollution Dispersion in the lectures how such models can be used to explain observed concentrations of air pollutants in an area and to test `what-if' scenarios for pollution control and reduction. You will use the Gaussian Plume Model

Moncrieff, John B.

45

Modeling volcanic ash dispersal  

ScienceCinema (OSTI)

Explosive volcanic eruptions inject into the atmosphere large amounts of volcanic material (ash, blocks and lapilli). Blocks and larger lapilli follow ballistic and non-ballistic trajectories and fall rapidly close to the volcano. In contrast, very fine ashes can remain entrapped in the atmosphere for months to years, and may affect the global climate in the case of large eruptions. Particles having sizes between these two end-members remain airborne from hours to days and can cover wide areas downwind. Such volcanic fallout entails a serious threat to aircraft safety and can create many undesirable effects to the communities located around the volcano. The assessment of volcanic fallout hazard is an important scientific, economic, and political issue, especially in densely populated areas. From a scientific point of view, considerable progress has been made during the last two decades through the use of increasingly powerful computational models and capabilities. Nowadays, models are used to quantify hazard scenarios and/or to give short-term forecasts during emergency situations. This talk will be focused on the main aspects related to modeling volcanic ash dispersal and fallout with application to the well known problem created by the Eyjafjll volcano in Iceland. Moreover, a short description of the main volcanic monitoring techniques is presented.

None

2011-10-06T23:59:59.000Z

46

Ballistic dispersion in temperature gradient focusing  

E-Print Network [OSTI]

regime is the most familiar regime in microfluidic systems, an oft-overlooked regime is that of purely kinematic (or ballistic) dispersion. In most microfluidic systems, this dispersion regime is transient systems. Keywords: microfluidics; temperature gradient focusing; kinematic dispersion; Taylor

Santiago, Juan G.

47

Thermal Ordering in Mixed Nanoclay Dispersions  

Science Journals Connector (OSTI)

This chapter investigates the temperature induced orientational ordering in 1:1 Laponite-MMT dispersion. This dispersion showed thermally activated irreversible conformational phase transition from mostly isot...

Ravi Kumar Pujala

2014-01-01T23:59:59.000Z

48

Controlling particle dispersion in latex paints containing associative thickeners  

Science Journals Connector (OSTI)

Dispersantshigh carboxylate dispersant (polyacrylic acid), a range of dispersants with varying amounts of carboxylate (i.e ... monomer), a hydrophobic dispersant (olefin/maleic acid copo...

Edward Kostansek

2007-12-01T23:59:59.000Z

49

Ion Colliders  

E-Print Network [OSTI]

High-energy ion colliders are large research tools in nuclear physics to study the Quark-Gluon-Plasma (QGP). The range of collision energy and high luminosity are important design and operational considerations. The experiments also expect flexibility with frequent changes in the collision energy, detector fields, and ion species. Ion species range from protons, including polarized protons in RHIC, to heavy nuclei like gold, lead and uranium. Asymmetric collision combinations (e.g. protons against heavy ions) are also essential. For the creation, acceleration, and storage of bright intense ion beams, limits are set by space charge, charge change, and intrabeam scattering effects, as well as beam losses due to a variety of other phenomena. Currently, there are two operating ion colliders, the Relativistic Heavy Ion Collider (RHIC) at BNL, and the Large Hadron Collider (LHC) at CERN.

Fischer, W

2015-01-01T23:59:59.000Z

50

Printed circuit dispersive transmission line  

DOE Patents [OSTI]

A printed circuit dispersive transmission line structure is disclosed comprising an insulator, a ground plane formed on one surface of the insulator, a first transmission line formed on a second surface of the insulator, and a second transmission line also formed on the second surface of the insulator and of longer length than the first transmission line and periodically intersecting the first transmission line. In a preferred embodiment, the transmission line structure exhibits highly dispersive characteristics by designing the length of one of the transmission line between two adjacent periodic intersections to be longer than the other. 5 figures.

Ikezi, H.; Lin-Liu, Y.R.; DeGrassie, J.S.

1991-08-27T23:59:59.000Z

51

Printed circuit dispersive transmission line  

DOE Patents [OSTI]

A printed circuit dispersive transmission line structure is disclosed comprising an insulator, a ground plane formed on one surface of the insulator, a first transmission line formed on a second surface of the insulator, and a second transmission line also formed on the second surface of the insulator and of longer length than the first transmission line and periodically intersecting the first transmission line. In a preferred embodiment, the transmission line structure exhibits highly dispersive characteristics by designing the length of one of the transmission line between two adjacent periodic intersections to be longer than the other.

Ikezi, Hiroyuki (Rancho Santa Fe, CA); Lin-Liu, Yuh-Ren (San Diego, CA); DeGrassie, John S. (Encinitas, CA)

1991-01-01T23:59:59.000Z

52

Nonlinear dispersion and compact structures  

SciTech Connect (OSTI)

Relaxing the distinguished ordering underlying the derivation of soliton supporting equations leads to new equations endowed with nonlinear dispersion crucial for the formation and coexistence of compactons, solitons with a compact support, and conventional solitons. Vibrations of the anharmonic mass-spring chain lead to a new Boussinesq equation admitting compactons and compact breathers. The model equation [ital u][sub [ital t

Rosenau, P. (Technion, Haifa 32000 (Israel) Center For Nonlinear Studies, MS-B258 Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States))

1994-09-26T23:59:59.000Z

53

Multiple overseas dispersal in amphibians  

Science Journals Connector (OSTI)

...other islands in the western Indian Ocean have been subject to intense...amphibians, which in the western Indian Ocean region are mostly rep...further used as a new calibration point of a molecular clock. We thereby...amphibian overseas dispersal in the Indian Ocean region and the origin...

2003-01-01T23:59:59.000Z

54

5, 1196512030, 2005 Dispersion on  

E-Print Network [OSTI]

ACPD 5, 11965­12030, 2005 Dispersion on complex terrain under winter conditions J. L. Palau et al-resolution mesoscale and Lagrangian particle models J. L. Palau1 , G. P´erez-Landa1 , J. Meli´a2 , D. Segarra2 , and M November 2005 ­ Published: 22 November 2005 Correspondence to: J. L. Palau (jlp@confluencia.biz) © 2005

Paris-Sud XI, Université de

55

Shear dispersion in dense granular flows  

E-Print Network [OSTI]

We formulate and solve a model problem of dispersion of dense granular materials in rapid shear flow down an incline. The effective dispersivity of the depth-averaged concentration of the dispersing powder is shown to vary as the P\\'eclet number squared, as in classical Taylor--Aris dispersion of molecular solutes. An extensions to generic shear profiles is presented, and possible applications to industrial and geological granular flows are noted.

Christov, Ivan C

2014-01-01T23:59:59.000Z

56

Gravitational dispersion in a torsional wave machine  

E-Print Network [OSTI]

We demonstrate that mechanical waves traveling in a torsional, mechanical wave machine exhibit dispersion due to gravity and the discreteness of the medium. We also show that although the dispersion due to discreteness is negligible, the dispersion due to gravity can be easily measured, and can be shown to disappear in a zero-gravity environment.

Rafael de la Madrid; Alejandro Gonzalez; George Irwin

2014-09-01T23:59:59.000Z

57

Composite oxygen ion transport element  

SciTech Connect (OSTI)

A composite oxygen ion transport element that has a layered structure formed by a dense layer to transport oxygen ions and electrons and a porous support layer to provide mechanical support. The dense layer can be formed of a mixture of a mixed conductor, an ionic conductor, and a metal. The porous support layer can be fabricated from an oxide dispersion strengthened metal, a metal-reinforced intermetallic alloy, a boron-doped Mo.sub.5Si.sub.3-based intermetallic alloy or combinations thereof. The support layer can be provided with a network of non-interconnected pores and each of said pores communicates between opposite surfaces of said support layer. Such a support layer can be advantageously employed to reduce diffusion resistance in any type of element, including those using a different material makeup than that outlined above.

Chen, Jack C. (Getzville, NY); Besecker, Charles J. (Batavia, IL); Chen, Hancun (Williamsville, NY); Robinson, Earil T. (Mentor, OH)

2007-06-12T23:59:59.000Z

58

FAST ION STUDIES OF ION CYCLOTRON HEATING  

E-Print Network [OSTI]

FAST ION STUDIES OF ION CYCLOTRON HEATING IN THE PLT TOKAMAK Gregory Wayne Hammett;@1986 Gregory Wayne Hammett ALL RIGHTS RESERVED #12;Abstract Fast Ion Studies of Ion Cyclotron Heating about the physics of wave heating. Previous experiments have demonstrated that ion cyclotron heating

Hammett, Greg

59

Measurements of the Shear Alfven Wave Dispersion for Finite Perpendicular Wave Number C. A. Kletzing,* S. R. Bounds, and J. Martin-Hiner  

E-Print Network [OSTI]

. This allows us to test theoretical predictions of the dispersion of these waves by direct comparison with data Van Allen Hall, Iowa City, Iowa 52245 W. Gekelman and C. Mitchell Department of Physics, University=!pe, is 0.42 cm and the ion acoustic gyroradius (the gyroradius of ions with energy equal

California at Los Angles, University of

60

Delamination of Surfactant-Intercalated Brucite-Like Hydroxy Salts of Cobalt and Copper and Solvothermal Decomposition of the Resultant Colloidal Dispersions  

Science Journals Connector (OSTI)

Delamination of Surfactant-Intercalated Brucite-Like Hydroxy Salts of Cobalt and Copper and Solvothermal Decomposition of the Resultant Colloidal Dispersions ... These are neutral layered solids whose structure is derived from that of brucite-like M(OH)2. ... Brucite consists of hexagonal packing of OH? ions, and the M2+ ions occupy alternate layers of octahedral sites. ...

Jacqueline. T. Rajamathi; Anthony Arulraj; N. Ravishankar; James Arulraj; Michael Rajamathi

2008-08-26T23:59:59.000Z

Note: This page contains sample records for the topic "ion dispersion thermochronometry" 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

PRICE LEVELS AND DISPERSION WITH ASYMMETRIC INFORMATION.  

E-Print Network [OSTI]

??In the extensive literature on price dispersions that exists to date, there is a gap in the analysis of how market structure affects prices as (more)

Bhattacharya, Tanmoy

2011-01-01T23:59:59.000Z

62

Dispersivity as an oil reservoir rock characteristic  

SciTech Connect (OSTI)

The main objective of this research project is to establish dispersivity, {alpha}{sub d}, as an oil reservoir rock characteristic and to use this reservoir rock property to enhance crude oil recovery. A second objective is to compare the dispersion coefficient and the dispersivity of various reservoir rocks with other rock characteristics such as: porosity, permeability, capillary pressure, and relative permeability. The dispersivity of a rock was identified by measuring the physical mixing of two miscible fluids, one displacing the other in a porous medium. 119 refs., 27 figs., 12 tabs.

Menzie, D.E.; Dutta, S.

1989-12-01T23:59:59.000Z

63

Enhanced dispersion in cylindrical packed beds  

Science Journals Connector (OSTI)

...method dispersivity geometry ground water heterogeneity hydrodynamics numerical models pollution pore water porosity remediation simulation tracers 2001 07...processes including groundwater remediation, secondary oil recovery...

2002-01-01T23:59:59.000Z

64

Dispersion compensation for attosecond electron pulses  

SciTech Connect (OSTI)

We propose a device to compensate for the dispersion of attosecond electron pulses. The device uses only static electric and magnetic fields and therefore does not require synchronization to the pulsed electron source. Analogous to the well-known optical dispersion compensator, an electron dispersion compensator separates paths by energy in space. Magnetic fields are used as the dispersing element, while a Wien filter is used for compensation of the electron arrival times. We analyze a device with a size of centimeters, which can be applied to ultrafast electron diffraction and microscopy, and fundamental studies.

Hansen, Peter; Baumgarten, Cory; Batelaan, Herman; Centurion, Martin [Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, Nebraska 68588 (United States)

2012-08-20T23:59:59.000Z

65

secondary ion detection | EMSL  

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

ion detection secondary ion detection Leads No leads are available at this time. Magnesium behavior and structural defects in Mg+ ion implanted silicon carbide. Abstract: As a...

66

A review of dispersion modelling and its application to the dispersion of particles: An overview of different dispersion models available  

Science Journals Connector (OSTI)

This paper provides the first review of the application of atmospheric models for particle dispersion. The different types of dispersion models available, from simple box type models to complex fluid dynamics models are outlined and the suitability of the different approaches to dispersion modelling within different environments, in regards to scale, complexity of the environment and concentration parameters is assessed. Finally, several major commercial and non-commercial particle dispersion packages are reviewed, detailing which processes are included and advantages and limitations of their use to modelling particle dispersion. The models reviewed included: Box models (AURORA, CPB and PBM), Gaussian models (CALINE4, HIWAY2, CAR-FMI, OSPM, CALPUFF, AEROPOL, AERMOD, UK-ADMS and SCREEN3), Lagrangian/Eulerian Models (GRAL, TAPM, ARIA Regional), CFD models (ARIA Local, MISKAM, MICRO-CALGRID) and models which include aerosol dynamics (GATOR, MONO32, UHMA, CIT, AERO, RPM, AEROFOR2, URM-1ATM, MADRID, CALGRID and UNI-AERO).

N.S. Holmes; L. Morawska

2006-01-01T23:59:59.000Z

67

Category:Geochemical Data Analysis | Open Energy Information  

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 Category Edit History Facebook icon Twitter icon » Category:Geochemical Data Analysis Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Geothermalpower.jpg Looking for the Geochemical Data Analysis page? For detailed information on exploration techniques, click here. Category:Geochemical Data Analysis Add.png Add a new Geochemical Data Analysis Technique Pages in category "Geochemical Data Analysis" The following 3 pages are in this category, out of 3 total. G Geothermometry T Thermal Ion Dispersion Thermochronometry Retrieved from "http://en.openei.org/w/index.php?title=Category:Geochemical_Data_Analysis&oldid=689825"

68

Nonthermal effects on the ion-acoustic solitons in Lorentzian electron-ion plasmas  

SciTech Connect (OSTI)

The nonthermal effects on the propagation of the ion-acoustic soliton are investigated in generalized Lorentzian electron-ion plasmas. The soliton solution of the Korteweg-de Vries equation is obtained as a function of the spectral index and modified stretched coordinate in the generalized Lorentzian plasma. It is found that the nonthermal effect on the dispersive term is found to be stronger than that on the nonlinear term. It is shown that the nonthermal effect of the Lorentzian plasma strongly suppresses the stretched coordinate of the ion-acoustic soliton. It is also shown that the nonthermal effect increases the position of the ion-acoustic soliton. In addition, the nonthermal effects on the position of the ion-acoustic soliton are found to be more important in the forward direction. It is found that the nonthermal effect strongly suppresses the amplitude of the ion-acoustic soliton in Lorentzian electron-ion plasmas. It is also found that the nonthermal effect on the amplitude of the ion-acoustic soliton is more significant in the backward direction.

Jung, Young-Dae [Department of Applied Physics, Hanyang University, Ansan, Kyunggi-Do 426-791 (Korea, Republic of); Hong, Woo-Pyo [Department of Electronics Engineering, Catholic University of Daegu, Hayang 712-702 (Korea, Republic of)

2011-02-15T23:59:59.000Z

69

Dispersed Project Wind Farm | Open Energy Information  

Open Energy Info (EERE)

Dispersed Project Wind Farm Dispersed Project Wind Farm Jump to: navigation, search Name Dispersed Project Wind Farm Facility Dispersed Project Sector Wind energy Facility Type Commercial Scale Wind Facility Status In Service Developer Northern Alternative Energy Energy Purchaser Xcel Energy Location Lincoln County MN Coordinates 44.4039°, -96.2646° 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":44.4039,"lon":-96.2646,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

70

The High Shear Rheological Properties of Dispersions  

Science Journals Connector (OSTI)

Extremely high shear rates are applied to pigment dispersions during various scale-up and manufactring processes in several industries. As reported in ... responsible for failures in coating processes. Several additives

V. Ribitsch; J. Pfragner

1995-01-01T23:59:59.000Z

71

Polariton dispersion of periodic quantum well structures  

Science Journals Connector (OSTI)

We studied the polariton dispersion relations of a periodic quantum-well structure with a period in the vicinity of half the exciton resonance wavelength, i.e., the Bragg structure. We classified polariton mod...

A. V. Mintsev; L. V. Butov; C. Ell; S. Mosor

2002-11-01T23:59:59.000Z

72

Transport and Dispersion in Complex Terrain  

Science Journals Connector (OSTI)

......recently along the mountain-plains interface near DOE's Rocky Flats Plant in Colorado. ASCOT meteorological experiments in January and February 1991 were coordinated with Rocky Flats tracer releases for airflow and dispersion model evaluations......

C.E. Elderkin; P.H. Gudiksen

1993-12-01T23:59:59.000Z

73

Energy Dispersion in African Easterly Waves  

Science Journals Connector (OSTI)

The existence of an upstream (eastward) group velocity for African easterly waves (AEWs) is shown based on single-point lag regressions using gridded reanalysis data from 1990 to 2010. The eastward energy dispersion is consistent with the ...

Michael Diaz; Anantha Aiyyer

2013-01-01T23:59:59.000Z

74

C60 Secondary Ion Fourier Transform Ion Cyclotron Resonance Mass...  

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

C60 Secondary Ion Fourier Transform Ion Cyclotron Resonance Mass Spectrometry. C60 Secondary Ion Fourier Transform Ion Cyclotron Resonance Mass Spectrometry. Abstract: Secondary...

75

CO adsorption on ion-exchanged Ru zeolite catalysts  

SciTech Connect (OSTI)

CO adsorption on ion-exchanged Ru zeolite catalysts, studied by IR spectroscopy, revealed the existence of three types of ruthenium which adsorbed the carbon monoxide into three different states. The ruthenium types were atomically or highly dispersed ruthenium, ruthenium clusters which formed ruthenium carbonyl, and larger (> 1 nm) particles, probably on the outer zeolite surfaces.

Goodwin, J.G. (Univ. of Pittsburgh); Naccache, G.

1980-08-01T23:59:59.000Z

76

Role of polymeric dispersant functional groups in the dispersion behaviour of titania pigment particles  

Science Journals Connector (OSTI)

The adsorption of polymeric dispersants onto titania pigment particles has been investigated ... the type of polymer functional group, using polyacrylic acid and modified polyacrylamides. The polyacrylamides incl...

S. Farrokhpay; G. Morris; D. Fornasiero; P. Self

2004-01-01T23:59:59.000Z

77

Dispersion Tolerance Enhancement in Electronic Dispersion Compensation Using Full Optical-Field Reconstruction  

Science Journals Connector (OSTI)

We experimentally verify the feasibility of receiver-side electronic dispersion compensation using optical-field reconstruction, and theoretically increase the fundamental limit of...

Zhao, Jian; McCarthy, Mary E; Gunning, Paul; Ellis, Andrew D

78

Ion Monitoring  

DOE Patents [OSTI]

The apparatus and method provide a technique for significantly reducing capacitance effects in detector electrodes arising due to movement of the instrument relative to the item/location being monitored in ion detection based techniques. The capacitance variations are rendered less significant by placing an electrically conducting element between the detector electrodes and the monitored location/item. Improved sensitivity and reduced noise signals arise as a result. The technique also provides apparatus and method suitable for monitoring elongate items which are unsuited to complete enclosure in one go within a chamber. The items are monitored part by part as the pass through the instrument, so increasing the range of items or locations which can be successfully monitored.

Orr, Christopher Henry (Calderbridge, GB); Luff, Craig Janson (Calderbridge, GB); Dockray, Thomas (Calderbridge, GB); Macarthur, Duncan Whittemore (Los Alamos, NM)

2003-11-18T23:59:59.000Z

79

ion microprobe | EMSL  

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

microprobe ion microprobe Leads No leads are available at this time. Magnesium behavior and structural defects in Mg+ ion implanted silicon carbide. Abstract: As a candidate...

80

EMSL - secondary ion detection  

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

secondary-ion-detection en Magnesium behavior and structural defects in Mg+ ion implanted silicon carbide. http:www.emsl.pnl.govemslwebpublicationsmagnesium-behavior-and-struc...

Note: This page contains sample records for the topic "ion dispersion thermochronometry" 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

Quantifying seed dispersal kernels from truncated seed-tracking data  

E-Print Network [OSTI]

have lower survival than those that disperse further away from conspecifics (Janzen 1970; Comita et al

Bermingham, Eldredge

82

Cylindrically confined pair-ion-electron and pair-ion plasmas having axial sheared flow and radial gradients  

SciTech Connect (OSTI)

The linear and nonlinear dynamics of pair-ion (PI) and pair-ion-electron plasmas (PIE) have been investigated in a cylindrical geometry with a sheared plasma flow along the axial direction having radial dependence. The coupled linear dispersion relation of low frequency electrostatic waves has been presented taking into account the Guassian profile of density and linear gradient of sheared flow. It is pointed out that the quasi-neutral cold inhomogeneous pure pair ion plasma supports only the obliquely propagating convective cell mode. The linear dispersion relation of this mode has been solved using boundary conditions. The nonlinear structures in the form of vortices formed by different waves have been discussed in PI and PIE plasmas.

Batool, Nazia; Saleem, H. [National Centre for Physics (NCP), Quaid-i-Azam University Campus, Islamabad (Pakistan)] [National Centre for Physics (NCP), Quaid-i-Azam University Campus, Islamabad (Pakistan)

2013-10-15T23:59:59.000Z

83

Theoretical description based on general and exact nonextensive dispersion relations of plasma oscillation data and verification of new acoustic plasma waves  

SciTech Connect (OSTI)

In this paper, first we represent the differences between spatial and temporal dispersions and their dependence on the measurement techniques for electrostatic waves in unmagnetized collisionless plasma. Then, three different experimental data are compared to the solutions of exact nonextensive dispersion relations for electron-ion and pair plasma. The results confirm the existence of new acoustic plasma waves. Furthermore, these comparisons yield a Maxwellian and a nonextensive plasma with nonextensive parameter q larger than one, and a Maxwellian plasma with some abnormal dispersion properties.

Ebrahimi, V.; Esfandyari-Kalejahi, A. [Department of Physics, Faculty of Sciences, Azarbaijan Shahid Madani University, 53714-161 Tabriz (Iran, Islamic Republic of)

2014-09-15T23:59:59.000Z

84

Instability of nonlinear dispersive solitary waves  

Science Journals Connector (OSTI)

We consider linear instability of solitary waves of several classes of dispersive long wave models. They include generalizations of KDV, BBM, regularized Boussinesq equations, with general dispersive operators and nonlinear terms. We obtain criteria for the existence of exponentially growing solutions to the linearized problem. The novelty is that we dealt with models with nonlocal dispersive terms, for which the spectra problem is out of reach by the Evans function technique. For the proof, we reduce the linearized problem to study a family of nonlocal operators, which are closely related to properties of solitary waves. A continuation argument with a moving kernel formula is used to find the instability criteria. These techniques have also been extended to study instability of periodic waves and of the full water wave problem.

Zhiwu Lin

2008-01-01T23:59:59.000Z

85

Instability of nonlinear dispersive solitary waves  

E-Print Network [OSTI]

We consider linear instability of solitary waves of several classes of dispersive long wave models. They include generalizations of KDV, BBM, regularized Boussinesq equations, with general dispersive operators and nonlinear terms. We obtain criteria for the existence of exponentially growing solutions to the linearized problem. The novelty is that we dealt with models with nonlocal dispersive terms, for which the spectra problem is out of reach by the Evans function technique. For the proof, we reduce the linearized problem to study a family of nonlocal operators, which are closely related to properties of solitary waves. A continuation argument with a moving kernel formula are used to find the instability criteria. Recently, these techniques have also been extended to study instability of periodic waves and to the full water wave problem.

Lin, Zhiwu

2008-01-01T23:59:59.000Z

86

Ceramics containing dispersants for improved fracture toughness  

DOE Patents [OSTI]

The invention is a ceramic composition containing a new class of dispersant for hindering crack propagation by means of one or more energy-dissipative mechanisms. The composition is composed of a ceramic matrix with dispersed particles of a transformation-prone rare-earth niobate, tantalate or mixtures of these with each other and/or with a rare-earth vanadate. The dispersants, having a generic composition tRMO.sub.4, where R is a rare-earth element, B is Nb or Ta and O is oxygen, are mixed in powder form with a powder of the matrix ceramic and sintered to produce a ceramic form or body. The crack-hindering mechanisms operates to provide improved performance over a wide range of temperature and operating conditions.

Nevitt, Michael V. (Wheaton, IL); Aldred, Anthony T. (Wheaton, IL); Chan, Sai-Kit (Darien, IL)

1987-01-01T23:59:59.000Z

87

Casimir energy, dispersion, and the Lifshitz formula  

SciTech Connect (OSTI)

Despite suggestions to the contrary, we show in this paper that the usual dispersive form of the electromagnetic energy density must be used to derive the Lifshitz force between parallel dielectric media. This conclusion follows from the general form of the quantum vacuum energy, which is the basis of the multiple-scattering formalism. As an illustration, we explicitly derive the Lifshitz formula for the interaction between parallel dielectric semispaces, including dispersion, starting from the expression for the total energy of the system. The issues of constancy of the energy between parallel plates and of the observability of electrostrictive forces are briefly addressed.

Milton, Kimball A.; Wagner, Jef; Parashar, Prachi; Brevik, Iver [Oklahoma Center for High Energy Physics and Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, Oklahoma 73019-2061 (United States); Department of Energy and Process Engineering, Norwegian University of Science and Technology, N-7491 Trondheim (Norway)

2010-03-15T23:59:59.000Z

88

Nonlinear time-fractional dispersive equations  

E-Print Network [OSTI]

In this paper we study some cases of time-fractional nonlinear dispersive equations (NDEs) involving Caputo derivatives, by means of the invariant subspace method. This method allows to find exact solutions to nonlinear time-fractional partial differential equations by separating variables. We first consider a third order time-fractional NDE that admits a four-dimensional invariant subspace and we find a similarity solution. We also study a fifth order NDE. In this last case we find a solution involving Mittag-Leffler functions. We finally observe that the invariant subspace method permits to find explicit solutions for a wide class of nonlinear dispersive time-fractional equations.

P. Artale Harris; R. Garra

2014-10-29T23:59:59.000Z

89

Method of dispersing particulate aerosol tracer  

DOE Patents [OSTI]

A particulate aerosol tracer which comprises a particulate carrier of sheet silicate composition having a particle size up to one micron, and a cationic dopant chemically absorbed in solid solution in the carrier. The carrier is preferably selected from the group consisting of natural mineral clays such as bentonite, and the dopant is selected from the group consisting of rare earth elements and transition elements. The tracers are dispersed by forming an aqueous salt solution with the dopant present as cations, dispersing the carriers in the solution, and then atomizing the solution under heat sufficient to superheat the solution droplets at a level sufficient to prevent reagglomeration of the carrier particles.

O'Holleran, Thomas P. (Belleville, MI)

1988-01-01T23:59:59.000Z

90

The Frequency and Damping of Ion Acoustic Waves in Collisional and Collisionless Two-species Plasma  

SciTech Connect (OSTI)

The dispersion properties of ion acoustic waves (IAW) are sensitive to the strength of ion-ion collisions in multi-species plasma in which the different species usually have differing charge-to-mass ratios. The modification of the frequency and damping of the fast and slow acoustic modes in a plasma composed of light (low Z) and heavy (high Z) ions is considered. In the fluid limit where the light ion scattering mean free path, {lambda}{sub th} is smaller than the acoustic wavelength, {lambda} = 2{pi}/k, the interspecies friction and heat flow carried by the light ions scattering from the heavy ions causes the damping. In the collisionless limit, k{lambda}{sub th} >> 1, Landau damping by the light ions provides the dissipation. In the intermediate regime when k{lambda}{sub th} {approx} 1, the damping is at least as large as the sum of the collisional and Landau damping.

R.L. Berger; E.J. Valeo

2004-08-18T23:59:59.000Z

91

Study of Pollutant Dispersion in Urban Environments  

E-Print Network [OSTI]

power plant using coal releases great amounts of harmful gases to produce the electric energy head: Study of pollutant dispersion in urban environments #12;Abstract Computational simulations can mechanics with the use of computer models and simulations. In this study the simulations of the complex

Allen, Gabrielle

92

A GIS-based atmospheric dispersion model  

E-Print Network [OSTI]

pollution due to the use of agricultural pesticide is a major concern to- day, regarding both public health dispersion and to propose an useful air pollution prediction tool, using fluid mechanics equations and open un outil de prediction de la pollution de l'air . Ce travail concerne la modélisation de la dérive

Boyer, Edmond

93

Localized overlap algorithm for unexpanded dispersion energies  

SciTech Connect (OSTI)

First-principles-based, linearly scaling algorithm has been developed for calculations of dispersion energies from frequency-dependent density susceptibility (FDDS) functions with account of charge-overlap effects. The transition densities in FDDSs are fitted by a set of auxiliary atom-centered functions. The terms in the dispersion energy expression involving products of such functions are computed using either the unexpanded (exact) formula or from inexpensive asymptotic expansions, depending on the location of these functions relative to the dimer configuration. This approach leads to significant savings of computational resources. In particular, for a dimer consisting of two elongated monomers with 81 atoms each in a head-to-head configuration, the most favorable case for our algorithm, a 43-fold speedup has been achieved while the approximate dispersion energy differs by less than 1% from that computed using the standard unexpanded approach. In contrast, the dispersion energy computed from the distributed asymptotic expansion differs by dozens of percent in the van der Waals minimum region. A further increase of the size of each monomer would result in only small increased costs since all the additional terms would be computed from the asymptotic expansion.

Rob, Fazle; Szalewicz, Krzysztof [Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716 (United States)] [Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716 (United States); Misquitta, Alston J. [School of Physics and Astronomy, Queen Mary, University of London, London E1 4NS (United Kingdom)] [School of Physics and Astronomy, Queen Mary, University of London, London E1 4NS (United Kingdom); Podeszwa, Rafa? [Institute of Chemistry, University of Silesia, Szkolna 9, 40-006 Katowice (Poland)] [Institute of Chemistry, University of Silesia, Szkolna 9, 40-006 Katowice (Poland)

2014-03-21T23:59:59.000Z

94

8, 67936824, 2008 dispersion rates in  

E-Print Network [OSTI]

patterns, it is shown that initial buoyancy fluxes at ship stack have minor effect on plume dilution rate modeling and measurement (remote or "in-situ") studies of ship exhaust25 effects must dealACPD 8, 6793­6824, 2008 Ship plume dispersion rates in convective BL F. Chosson et al. Title Page

Paris-Sud XI, Université de

95

Dispersal Pathways for Particle-Associated Pollutants  

Science Journals Connector (OSTI)

...sediments in the bight apex revealed that...muddy Christiaensen Basin, adjacent to the...for the New York Bight apex, Hudson-Raritan...ing Christiaensen Basin (12 percent by weight...0. May 1974 Aug Bight apex as highly dispersive...the Christiaensen Basin and the Hudson Shelf...

Robert A. Young; Donald J. P. Swift; Thomas L. Clarke; George R. Harvey; Peter R. Betzer

1985-08-02T23:59:59.000Z

96

Phonon dispersion of graphite J. Maultzsch  

E-Print Network [OSTI]

the acoustic branches below 400 cm-1 were measured by inelastic neutron scattering [1]. The optical phonons. The phonon dispersion of graphite was determined by inelastic X-ray scattering along the -K, K-M, and -K. This coupling dominates the scattering mechanism in both electronic transport and Raman scattering. Many

Nabben, Reinhard

97

Dispersing brush mice prefer habitat like home  

Science Journals Connector (OSTI)

...Dispersing brush mice prefer habitat like home Karen E Mabry * Judy A Stamps * Author...habitat similar to that at our study site, home ranges were 0.11-0.15ha, and no between-sex difference in adult home range size was detected (Kalcounis-Ruppell...

2008-01-01T23:59:59.000Z

98

Ion sources for ion implantation technology (invited)  

SciTech Connect (OSTI)

Ion sources for ion implantation are introduced. The technique is applied not only to large scale integration (LSI) devices but also to flat panel display. For LSI fabrication, ion source scheduled maintenance cycle is most important. For CMOS image sensor devices, metal contamination at implanted wafer is most important. On the other hand, to fabricate miniaturized devices, cluster ion implantation has been proposed to make shallow PN junction. While for power devices such as silicon carbide, aluminum ion is required. For doping processes of LCD fabrication, a large ion source is required. The extraction area is about 150 cm 10 cm, and the beam uniformity is important as well as the total target beam current.

Sakai, Shigeki, E-mail: sakai-shigeki@nissin.co.jp; Hamamoto, Nariaki; Inouchi, Yutaka; Umisedo, Sei; Miyamoto, Naoki [Nissin Ion Equipment co., ltd, 575 Kuze-Tonoshiro-cho Minami-ku, Kyoto 601-8205 (Japan)] [Nissin Ion Equipment co., ltd, 575 Kuze-Tonoshiro-cho Minami-ku, Kyoto 601-8205 (Japan)

2014-02-15T23:59:59.000Z

99

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

100

Electron Beam Ion Sources  

E-Print Network [OSTI]

Electron beam ion sources (EBISs) are ion sources that work based on the principle of electron impact ionization, allowing the production of very highly charged ions. The ions produced can be extracted as a DC ion beam as well as ion pulses of different time structures. In comparison to most of the other known ion sources, EBISs feature ion beams with very good beam emittances and a low energy spread. Furthermore, EBISs are excellent sources of photons (X-rays, ultraviolet, extreme ultraviolet, visible light) from highly charged ions. This chapter gives an overview of EBIS physics, the principle of operation, and the known technical solutions. Using examples, the performance of EBISs as well as their applications in various fields of basic research, technology and medicine are discussed.

Zschornacka, G; Thorn, A

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ion dispersion thermochronometry" 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

Ion Distribution And Electronic Stopping Power For Au ions In...  

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

Distribution And Electronic Stopping Power For Au ions In Silicon Carbide. Ion Distribution And Electronic Stopping Power For Au ions In Silicon Carbide. Abstract: Accurate...

102

Particle dispersion by random waves in the rotating Boussinesq system  

E-Print Network [OSTI]

We present a theoretical and numerical study of horizontal particle dispersion due to random waves in the three-dimensional rotating and stratified Boussinesq system, which serves as a simple model to study the dispersion ...

Ferrari, Raffaele

103

Viscosity model of high-viscosity dispersing system  

Science Journals Connector (OSTI)

High-viscosity dispersing system is formed by dispersing the solid particles in the high-viscosity continuous medium. It is very easy to ... the rheology behavior becomes complicated. The apparent viscosity of th...

Xian-fu Wei ???; Na Wang ??

2008-09-01T23:59:59.000Z

104

Update 1 to: A Dispersion Modeling Analysis of Downwash from...  

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

Update 1 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant, Modeling Unit 1 Emissions in a Cycling Mode Update 1 to: A Dispersion Modeling...

105

Thermal boundary layer development in dispersed flow film boiling  

E-Print Network [OSTI]

Dispersed flow film boiling consists of a dispersion of droplets which are carried over a very hot surface by their vapor. This process occurs in cryogenic equipment and wet steam turbines. It is also of interest in the ...

Hull, Lawrence M.

1982-01-01T23:59:59.000Z

106

Dispersion modeling of ground-level area sources of particulate  

E-Print Network [OSTI]

The use of dispersion modeling by State Air Pollution hics. Regulatory Agencies (SAPRAS) is increasing. Dispersion modeling provides a quick and efficient means of determining the downwind impact of pollutant release from a source. The SAPRAS...

Fritz, Bradley Keith

2012-06-07T23:59:59.000Z

107

Geographic dispersion in teams : its history, experience, measurement, and change  

E-Print Network [OSTI]

This thesis begins with the simple argument that geographic dispersion has gone surprisingly unexamined despite its role as the domain-defining construct for geographically dispersed teams (a.k.a. "virtual teams"). The ...

O'Leary, Michael Boyer, 1969-

2002-01-01T23:59:59.000Z

108

Paper Number -1-Simulation model of dispersions in turning process  

E-Print Network [OSTI]

Paper Number -1- Simulation model of dispersions in turning process Wolff Valery 1, Lefebvre Arnaud. In this paper, an extent of the simulation model of dispersions in turning process first exposed in [W1

Paris-Sud XI, Université de

109

Dispersion-free radial transmission lines  

DOE Patents [OSTI]

A dispersion-free radial transmission line ("DFRTL") preferably for linear accelerators, having two plane conductors each with a central hole, and an electromagnetically permeable material ("EPM") between the two conductors and surrounding a channel connecting the two holes. At least one of the material parameters of relative magnetic permeability, relative dielectric permittivity, and axial width of the EPM is varied as a function of radius, so that the characteristic impedance of the DFRTL is held substantially constant, and pulse transmission therethrough is substantially dispersion-free. Preferably, the EPM is divided into concentric radial sections, with the varied material parameters held constant in each respective section but stepwise varied between sections as a step function of the radius. The radial widths of the concentric sections are selected so that pulse traversal time across each section is the same, and the varied material parameters of the concentric sections are selected to minimize traversal error.

Caporaso, George J. (Livermore, CA); Nelson, Scott D. (Patterson, CA)

2011-04-12T23:59:59.000Z

110

Dispersion relations of surface phonons in LiF(001) and NaF(001)  

Science Journals Connector (OSTI)

Recent atom-scattering experimental data have stimulated a new investigation on the surface phonons of some alkali halides. In the framework of Green's-function method applied to breathing-shell model dynamics we have calculated the dispersion curves and a few K-selected densities of states of surface phonons for the (001) surface of NaF and LiF at room temperature. Particular attention is paid to the change in ion polarizabilities occurring at the surface and its effect on the Rayleigh wave frequencies at the zone boundary.

G. Benedek; G. P. Brivio; L. Miglio; V. R. Velasco

1982-07-15T23:59:59.000Z

111

HIGHLY DISPERSED ALLOY CATHODE CATALYST FOR DURABILITY  

E-Print Network [OSTI]

Understanding high performance materials Pt/C cathode B.S.E. Pt PtCo/C cathode IrB.S.E. Pt Co PtIrCo/C cathodeHIGHLY DISPERSED ALLOY CATHODE CATALYST FOR DURABILITY T. D. Jarvi UTC Power Corporation Electrochemical Area Loss Activity at 900 mVRHE (IR-Free) 0.44 A/mg Pt Specific Activity at 900 m

112

Dispersion relation for magnetosonic waves within the upper atmospheric plasma  

Science Journals Connector (OSTI)

The dispersion relation for magnetosonic waves within the upper atmospheric plasma has been derived. The result can be...

S. S. De; Bithika Ghosh; Manasi Mal; B. Ghosh

1990-01-01T23:59:59.000Z

113

Human-mediated dispersal of seeds over long distances  

Science Journals Connector (OSTI)

...38 Bo: 1.55 power exponential...the mechanistic wind dispersal model...3.90.11 plant height (m) B...dispersal kernel for wind dispersal and...Average vertical winds (table 2, scenario...and the fitted power-exponential...scenarios: (a,b) plant growing next to...

2009-01-01T23:59:59.000Z

114

Biogenic Hydroxylated Carboxylate Monomers Serve as Dispersants for  

E-Print Network [OSTI]

, such as polymethacrylic acid (PM.AA) and polyacrylic acid (PAA) are used as dispersants (1). Similarly, previous work from as dispersion additives in the processing ofceramic particles. Only carboxylic acids containing one or more, particle packing, and dispersant adsorption characeristics indicated that carboxylic acid groups

Aksay, Ilhan A.

115

Quantum nuclear effects on surfaces and dispersion bonded systems  

E-Print Network [OSTI]

Quantum nuclear effects on surfaces and dispersion bonded systems Erlend Davidson A dissertation all system types. In particular long range van der Waals dispersion forces and quantum nuclear effects of the art methods to include van der Waals dispersion and quantum nuclear effects on a range of well defined

Guillas, Serge

116

Single Ion Implantation  

ScienceCinema (OSTI)

On the equipment needed to implant ions in silicon and other materials. More information: http://newscenter.lbl.gov/f...

Thomas Schenkel

2010-01-08T23:59:59.000Z

117

Oblique propagation of ion acoustic soliton-cnoidal waves in a magnetized electron-positron-ion plasma with superthermal electrons  

SciTech Connect (OSTI)

The oblique propagation of ion-acoustic soliton-cnoidal waves in a magnetized electron-positron-ion plasma with superthermal electrons is studied. Linear dispersion relations of the fast and slow ion-acoustic modes are discussed under the weak and strong magnetic field situations. By means of the reductive perturbation approach, Korteweg-de Vries equations governing ion-acoustic waves of fast and slow modes are derived, respectively. Explicit interacting soliton-cnoidal wave solutions are obtained by the generalized truncated Painlev expansion. It is found that every peak of a cnoidal wave elastically interacts with a usual soliton except for some phase shifts. The influence of the electron superthermality, positron concentration, and magnetic field obliqueness on the soliton-cnoidal wave are investigated in detail.

Wang, Jian-Yong; Cheng, Xue-Ping; Tang, Xiao-Yan, E-mail: xytang@sjtu.edu.cn [Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240 (China)] [Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240 (China); Yang, Jian-Rong [Department of Physics and Electronics, Shangrao Normal University, Jiangxi, Shangrao 334001 (China)] [Department of Physics and Electronics, Shangrao Normal University, Jiangxi, Shangrao 334001 (China); Ren, Bo [Institute of Nonlinear Science, Shaoxing University, Shaoxing 312000 (China)] [Institute of Nonlinear Science, Shaoxing University, Shaoxing 312000 (China)

2014-03-15T23:59:59.000Z

118

E-Print Network 3.0 - atmospheric dispersion experiment Sample...  

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

- WIND DISPERSAL IN FRESHWATER WETLANDS: KNOWLEDGE FOR CONSERVATION AND RESTORATION - 271 Applied... , dispersal by wind is often overlooked because dispersal by water is ......

119

Ion Surface Engineering  

E-Print Network [OSTI]

Ion Surface Engineering Southwest Research Institute® San Antonio, Texas surfaceengineering.swri.com #12;he ion surface engineering program at Southwest Research Institute (SwRI® ) is dedicated, and the Defense Advanced Research Projects Agency. SwRI's ion surface engineering activities include: s Thin

Chapman, Clark R.

120

Kinetic study of ion-acoustic plasma vortices  

SciTech Connect (OSTI)

The kinetic theory of electron plasma waves with finite orbital angular momentum has recently been introduced by Mendonca. This model shows possibility of new kind of plasma waves and instabilities. We have extended the theory to ion-acoustic plasma vortices carrying orbital angular momentum. The dispersion equation is derived under paraxial approximation which exhibits a kind of linear vortices and their Landau damping. The numerical solutions are obtained and compared with analytical results which are in good agreement. The physical interpretation of the ion-acoustic plasma vortices and their Landau resonance conditions are given for typical case of Maxwellian plasmas.

Khan, S. A. [National Centre for Physics (NCP), Quaid-i-Azam University Campus, Islamabad 45320 (Pakistan); Aman-ur-Rehman, E-mail: amansadiq@gmail.com [Pakistan Institute of Engineering and Applied Sciences (PIEAS), P.O. Nilore, Islamabad 45650 (Pakistan); Mendonca, J. T. [IPFN, Instituto Superior Tchnico, Av. Rovisco Pais 1, 1049-001 Lisboa (Portugal)

2014-09-15T23:59:59.000Z

Note: This page contains sample records for the topic "ion dispersion thermochronometry" 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

Electromagnetic Ion-Beam Instabilities in the Solar Wind  

Science Journals Connector (OSTI)

The stability of a plasma consisting of two, unequal, isotropic, ion beams streaming along a uniform magnetic field has been investigated by numerically solving the full electromagnetic, Vlasov, linear dispersion relation for high-? plasmas. Three instabilities are found: One is closely associated with the usual Alfvn mode and the two others with the "fast" or magnetosonic mode. The importance of these instabilities for certain neutral-beam-injection experiments and in the solar wind is emphasized.

Michael D. Montgomery; S. Peter Gary; D. W. Forslund; W. C. Feldman

1975-09-08T23:59:59.000Z

122

Method for absorbing an ion from a fluid  

DOE Patents [OSTI]

A method for absorbing an ion from a fluid by using dispersing an organic acid into an anion surfactant solution, mixing in a divalent-metal containing compound and a trivalent-metal containing compound and calcining the resulting solid layered double hydroxide product to form an absorbent material and then contacting the absorbent material with an aqueous solution of cations or anions to be absorbed.

Gao, Huizhen (Carlsbad, NM); Wang, Yifeng (Albuquerque, NM); Bryan, Charles R. (Albuquerque, NM)

2007-07-03T23:59:59.000Z

123

Ion Sources - Cyclotron  

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

Sources Sources The 88-Inch Cyclotron is fed by three Electron Cyclotron Resonance (ECR) high-charge-state ion sources, the ECR, the AECR, and VENUS, currently the most powerful ECR ion source in the world. Built to answer the demand for intense heavy ion beams, these high performance ion sources enable the 88-Inch Cyclotron to accelerate beams of ions from hydrogen to uranium. The ECR ion sources allow the efficient use of rare isotopes of stable elements, either from natural or enriched sources. A variety of metallic ion beams are routinely produced in our low temperature oven (up to 600°C) and our high temperature oven (up to 2100°C). Furthermore, the ability to produce "cocktails" (mixtures of beams) for the Berkeley Accelerator Space Effects (BASE) Facility adds tremendously to the flexibility of the 88-Inch Cyclotron.

124

Crater formation by single ions, cluster ions and ion "showers"  

E-Print Network [OSTI]

The various craters formed by giant objects, macroscopic collisions and nanoscale impacts exhibit an intriguing resemblance in shapes. At the same time, the arc plasma built up in the presence of sufficiently high electric fields at close look causes very similar damage on the surfaces. Although the plasmawall interaction is far from a single heavy ion impact over dense metal surfaces or the one of a cluster ion, the craters seen on metal surfaces after a plasma discharge make it possible to link this event to the known mechanisms of the crater formations. During the plasma discharge in a high electric field the surface is subject to high fluxes (~1025 cm-2s-1) of ions with roughly equal energies typically of the order of a few keV. To simulate such a process it is possible to use a cloud of ions of the same energy. In the present work we follow the effect of such a flux of ions impinging the surface in the shower manner, to find the transition between the different mechanisms of crater formati...

Djurabekova, Flyura; Timko, Helga; Nordlund, Kai; Calatroni, Sergio; Taborelli, Mauro; Wuensch, Walter

2011-01-01T23:59:59.000Z

125

Non-Dispersive, Accelerated Matter-Waves  

E-Print Network [OSTI]

It is shown that under certain dynamical conditions a material wave packet displays coherent, non-dispersive accelerated evolution in gravitational field over a modulated atomic mirror. The phenomenon takes place as a consequence of simultaneous presence of the dynamical localization and the coherent Fermi acceleration for the same modulation amplitude. It is purely a quantum mechanical effect as the windows of modulation strengths supporting dynamical localization and Fermi acceleration overlap for larger effective Plank constant. Present day experimental techniques make it feasible to realize the system in laboratory.

Farhan Saif; Khalid Naseer; Muhammad Ayub

2014-06-22T23:59:59.000Z

126

Investigation of Interactions Between Antiwear and Dispersant Additives and Their Effect on Surface Activity of Zddp  

Science Journals Connector (OSTI)

Publisher Summary This chapter describes both the interactions between zinc dialkyldithiophosphates (ZDDP) and dispersant in oil and the results of these interactions on the ZDDP reactivity with metallic surfaces. It discusses the behavior of the additives in oil using infrared spectroscopy (IR) and nuclear magnetic resonance of Phosphorus (31P NMR). The results highlight not only the formation of complexes, but also chemical reaction in terms of changes in the Zn2+ ion coordination. Molecular modeling and the semi-empirical molecular orbital approach were used in the study described in the chapter as an additional tool to reinforce the experimental results and for interpretation of the spectroscopic changes. In addition, the chapter also reviews the behavior of ZDDP and ZDDP/dispersant mixtures on surfaces to understand the way by which the dispersant could affect antiwear properties of ZDDP. The antiwear additives used were methyl-4pentyl-2 ZDDP and isopropyl ZDDP synthesized at IFP (Institut Francais du Petrole) with high purity level.

H. Mansuy; P. Beccat; Y. Huiban; T. Palermo; B. Desbat

1995-01-01T23:59:59.000Z

127

Average values and dispersion (in parentheses)  

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

Average values and dispersion (in parentheses) Average values and dispersion (in parentheses) Base-pair Parameters --------------------------------------------------------------------------------------- Shear Stretch Stagger Buckle Propeller Opening 3DNA A 0.01(0.23) -0.18(0.10) 0.02(0.25) -0.13(7.77) -11.79(4.14) 0.57(2.80) B 0.00(0.21) -0.15(0.12) 0.09(0.19) 0.53(6.74) -11.35(5.26) 0.63(3.05) CEHS A 0.01(0.23) -0.18(0.10) 0.02(0.25) -0.13(7.75) -11.82(4.14) 0.56(2.78) B 0.00(0.21) -0.14(0.12) 0.09(0.19) 0.53(6.73) -11.37(5.27) 0.62(3.03) CompDNA A 0.01(0.23) -0.18(0.10) 0.02(0.25) -0.12(7.70) -11.81(4.14) 0.56(2.79) B 0.00(0.21) -0.15(0.12) 0.09(0.19) 0.53(6.70) -11.37(5.26) 0.62(3.03) Curves A 0.01(0.23) -0.18(0.10) 0.02(0.25) -0.13(7.85) -11.76(4.12) 0.57(2.80)

128

Particle-in-cell simulations of ion-acoustic waves with application to Saturn's magnetosphere  

SciTech Connect (OSTI)

Using a particle-in-cell simulation, the dispersion and growth rate of the ion-acoustic mode are investigated for a plasma containing two ion and two electron components. The electron velocities are modelled by a combination of two kappa distributions, as found in Saturn's magnetosphere. The ion components consist of adiabatic ions and an ultra-low density ion beam to drive a very weak instability, thereby ensuring observable waves. The ion-acoustic mode is explored for a range of parameter values such as ?, temperature ratio, and density ratio of the two electron components. The phase speed, frequency range, and growth rate of the mode are investigated. Simulations of double-kappa two-temperature plasmas typical of the three regions of Saturn's magnetosphere are also presented and analysed.

Koen, Etienne J. [South African National Space Agency (SANSA), Space Science, Hermanus (South Africa); School of Electrical Engineering, Royal Institute of Technology (KTH), Stockholm (Sweden); Collier, Andrew B.; Hellberg, Manfred A. [School of Chemistry and Physics, University of KwaZulu-Natal, Durban (South Africa); Maharaj, Shimul K. [South African National Space Agency (SANSA), Space Science, Hermanus (South Africa)

2014-07-15T23:59:59.000Z

129

Ion photon emission microscope  

DOE Patents [OSTI]

An ion beam analysis system that creates microscopic multidimensional image maps of the effects of high energy ions from an unfocussed source upon a sample by correlating the exact entry point of an ion into a sample by projection imaging of the ion-induced photons emitted at that point with a signal from a detector that measures the interaction of that ion within the sample. The emitted photons are collected in the lens system of a conventional optical microscope, and projected on the image plane of a high resolution single photon position sensitive detector. Position signals from this photon detector are then correlated in time with electrical effects, including the malfunction of digital circuits, detected within the sample that were caused by the individual ion that created these photons initially.

Doyle, Barney L. (Albuquerque, NM)

2003-04-22T23:59:59.000Z

130

Ion Beam Materials Lab  

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

Facilities » Facilities » Ion Beam Materials Lab Ion Beam Materials Lab A new research frontier awaits! Our door is open and we thrive on mutually beneficial partnerships, collaborations that drive innovations and new technologies. April 12, 2012 Ion Beam Danfysik Implanter High Voltage Terminal. Contact Yongqiang Wang (505) 665-1596 Email Devoted to the characterization and modification of surfaces through the use of ion beams The Ion Beam Materials Laboratory (IBML) is a Los Alamos National Laboratory resource devoted to the characterization and modification of surfaces through the use of ion beams. The IBML provides and operates the core facilities, while supporting the design and implementation of specific apparati needed for experiments requested by users of the facility. The result is a facility with

131

Collection of ions  

DOE Patents [OSTI]

The apparatus and method provide an improved technique for detecting ions as the area from which ions are attracted to a detector is increased, consequently increasing the number of ions detected. This is achieved by providing the outer electrodes of the detector connected to the electrical potential, together with alternate intermediate electrodes. The other intermediate electrodes and preferably the housing are grounded. The technique renders such detection techniques more sensitive and gives them a lower threshold at which they can function.

Orr, Christopher Henry (Calderbridge, GB); Luff, Craig Janson (Calderbridge, GB); Dockray, Thomas (Calderbridge, GB); Macarthur, Duncan Whittemore (Los Alamos, NM); Bounds, John Alan (Los Alamos, NM); Koster, James E. (Los Alamos, NM)

2001-01-01T23:59:59.000Z

132

Helium Ion Microscope | EMSL  

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

other characterization capabilities. User Portal Name: Helium Ion Microscope Instrument ID: 34104 Availability: 10 hours a day, 5 days a week Facility: Quiet Wing Quick Specs...

133

EMSL - ion microprobe  

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

microprobe en Magnesium behavior and structural defects in Mg+ ion implanted silicon carbide. http:www.emsl.pnl.govemslwebpublicationsmagnesium-behavior-and-structural-defects...

134

Ion current interface.  

E-Print Network [OSTI]

?? Abstract Abstract The reason to measure the ion current in a combustion engine is to extract combustion parameters in order to achieve closed loop (more)

Johansson, Morgan

2005-01-01T23:59:59.000Z

135

Heavy Ion Event Displays  

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

The following images below depict real and simulated collisions of lead ions in the LHC experiments. Additional photos, video and information are available at these links:...

136

Preparation of natural brucite nanofibers by the dispersion method  

Science Journals Connector (OSTI)

The preparation of natural brucite nanofibers through dispersion by the wet process is described. The test results indicate that brucite fibers can be well dispersed by using sodium dioctyl sulfosuccinate (OT) as the dispersant at a dispersant/fiber mass ratio of 0.15:1, dispersing for 30 min at a water/solid mass ratio of 20:1. The prepared nanofibers were characterized with X-ray diffraction (XRD), scanning electron microscope (SEM), and transmission electron microscope (TEM). It is shown that the prepared single brucite nanofiber is around 30 nm in diameter and the talus of the nonsingle brucite nanofibers is about 50-150 nm in diameter. Natural brucite mineral fibers were treated by the dispersion method to obtain nanomaterials. These fibers have significant advantages over artificial nanofibers both in yield and in cost.

Li Xu; Wen Ni; Wenping Li; Xingde Liu; Hailong Yang; Xiaoguang Yang

2008-01-01T23:59:59.000Z

137

The ion experiment onboard the Interball-Aurora satellite; initial results on velocity-dispersed structures  

E-Print Network [OSTI]

, for the processes at the root of electromagnetic energy dissipation in the auroral zones, and for solar wind energy

Paris-Sud XI, Université de

138

Hierarchically Ordered Cadmium Sulfide Nanowires Dispersed in Aqueous Solution  

Science Journals Connector (OSTI)

The paper reports on the preparation, characterization, and dispersion of cadmium sulfide (CdS) nanowires using ordered mesoporous silica, SBA-15, as a template. A homogeneous and stable dispersion of hierarchically ordered CdS nanowires in water ...This work demonstrates the formation of cadmium sulfide (CdS) nanowires. These nanowires are templated by mesoporous SBA-15 and their connectivity is tuned by the number of nanoconnectors (templated by micropores). They form stable dispersions in aqueous sodium dodecyl sulfate (SDS) solutions.

Rajagopalan Thiruvengadathan; Oren Regev

2005-05-17T23:59:59.000Z

139

Crumpled Graphene-Encapsulated Si Nanoparticles for Lithium Ion Battery Anodes  

E-Print Network [OSTI]

Crumpled Graphene-Encapsulated Si Nanoparticles for Lithium Ion Battery Anodes Jiayan Luo, Xin Zhao Information ABSTRACT: Submicrometer-sized capsules made of Si nanoparticles wrapped by crumpled graphene dispersion of micrometer-sized graphene oxide (GO) sheets and Si nanoparticles were nebulized to form aerosol

Huang, Jiaxing

140

Atmospheric Dispersion Modeling in Safety Analyses; GENII  

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

Workshop to Discuss Issues Regarding Deposition Workshop to Discuss Issues Regarding Deposition Velocity June 5-6, 2012 Jeremy Rishel Bruce Napier Atmospheric Dispersion Modeling in Safety Analyses: GENII Today's Presentation.... Will provide a high-level overview of the GENII codes. Will cover basic aspects of GENII's acute atmospheric transport model. Will review the GENII deposition model that is used to estimate the deposition velocity used in plume depletion. 2 GENII Development History 1988 - GENII V1 released ICRP-26/30/48 dosimetry 1990 - GENII V1.485 stabilized Current DOE Toolbox Version 1992 - GENII-S stochastic version 2004 - GENII V2 ICRP-72 age-dependent dosimetry Federal Guidance Report 13 risk factors

Note: This page contains sample records for the topic "ion dispersion thermochronometry" 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

Dispersion compensation in chirped pulse amplification systems  

DOE Patents [OSTI]

A chirped pulse amplification system includes a laser source providing an input laser pulse along an optical path. The input laser pulse is characterized by a first temporal duration. The system also includes a multi-pass pulse stretcher disposed along the optical path. The multi-pass pulse stretcher includes a first set of mirrors operable to receive input light in a first plane and output light in a second plane parallel to the first plane and a first diffraction grating. The pulse stretcher also includes a second set of mirrors operable to receive light diffracted from the first diffraction grating and a second diffraction grating. The pulse stretcher further includes a reflective element operable to reflect light diffracted from the second diffraction grating. The system further includes an amplifier, a pulse compressor, and a passive dispersion compensator disposed along the optical path.

Bayramian, Andrew James; Molander, William A.

2014-07-15T23:59:59.000Z

142

Electromagnetic waves with nonlinear dispersion law  

E-Print Network [OSTI]

Last year physicists in Europe have measured the velocity of the neutrinos particles. They found the neutrinos moving faster than the speed of light in vacuum. This result means that Einstein's relativity principle and its consequences in modern physics need a global additional renovation. In present paper the part of this problem is considered in terms of basic Maxwell's method only. By means of introduction a diffusion like displacement current the new super wave equation was derived, which permits of its solution be described the electromagnetic waves moving some faster than the conventional speed of light in vacuum especially in a gamma ray of a very short wave length region. The unique properties of these waves are that they undergo nonlinear dispersion law, uppermost limit of which is restricted. Discussion of further experimental problems and a number of estimations are given for the macro physic super wave equations also.

Pavel Mednis

2012-02-08T23:59:59.000Z

143

Radiological Dispersion Devices and Basic Radiation Science  

Science Journals Connector (OSTI)

Introductory physics courses present the basic concepts of radioactivity and an overview of nuclear physics that emphasizes the basic decay relationship and the various types of emitted radiation. Although this presentation provides insight into radiological science it often fails to interest students to explore these concepts in a more rigorous manner. One reason for limited student interest is the failure to link the discussion to topics of current interest. The author has found that presenting this material with a link to radiological dispersion devices (RDDs) or dirty bombs and their associated health effects provides added motivation for students. The events of Sept. 11 2001 and periodic media focus on RDDs heighten student interest from both a scientific curiosity as well as a personal protection perspective. This article presents a framework for a more interesting discussion of the basics of radiation science and their associated health effects. The presentation can be integrated with existing radioactivitylectures or added as a supplementary or enrichment activity.

Joseph John Bevelacqua

2010-01-01T23:59:59.000Z

144

Confined Zone Dispersion Project: A DOE assessment  

SciTech Connect (OSTI)

The goal of the US Department of Energy (DOE) Clean Coal Technology (CCT) program is to furnish the energy marketplace with a number of advanced, more efficient, and environmentally responsible coal utilization technologies through demonstration projects. These projects seek to establish the commercial feasibility of the most promising advanced coal technologies that have developed beyond the proof-of-concept (POC) stage. This document serves as a DOE post-project assessment of the Confined Zone Dispersion Project in CCT Round 3. In 1990, Bechtel Corporation entered into a cooperative agreement to conduct the demonstration project. The Seward Power Station of Pennsylvania Electric Company (now GPU Genco) was the host site. DOE funded 43 percent of the total project cost of $12,173,000. The project was started in June 1990 and was scheduled to be completed in June 1993. As a result of various operating problems, the schedule was extended into 1994 without additional cost to DOE. Bechtel provided the additional financing and GPU Genco provided electricity, steam, and water to operate the unit. The independent evaluation contained herein is based primarily on information from Bechtel's final technical report (1994) as well as other references cited. Confined Zone Dispersion (CZD) is a flue gas desulfurization (FGD) process that removes sulfur dioxide (SO{sub 2}). A finely atomized slurry of reactive lime, calcium hydroxide or Ca(OH){sub 2} is injected into the flue-gas duct work, between the air preheater and the second-stage ESP. The lime reacts with the SO{sub 2}, forming dry solid reaction products. The downstream ESP captures the 2 reaction products along with the fly ash entrained in the flue gas. The CZD process was demonstrated on Unit 5, a 147-MWe utility unit with two flue gas ducts. One of the ducts was extended to provide the requisite residence time and retrofitted with the CZD lime injection equipment.

NONE

1999-11-30T23:59:59.000Z

145

Synthesis and Evaluation of Wax Dispersant for Diesel  

Science Journals Connector (OSTI)

Synthesis and Evaluation of Wax Dispersant for Diesel ... We can predict that the sensitivity of diesels A and C will be better than that of diesel B. ...

Wangang Zheng; Shujun Wang; Jie Liu; Fanbin Meng; Yanshan Li; Huanqing Ma; Ting Li

2014-02-28T23:59:59.000Z

146

Application of microbicides for the storage protection of mineral dispersions  

Science Journals Connector (OSTI)

The dispersants, usually based today on salts of polyacrylic acid (PAA), represent a rich supply of... Figure 2 Microbial contamination an...

P. Schwarzentruber; P. A. C. Gane

2005-01-01T23:59:59.000Z

147

Chirped Laser Dispersion Spectroscopy with Directly Modulated Quantum Cascade Laser  

Science Journals Connector (OSTI)

A feasibility study of chirped laser dispersion spectroscopy (CLaDS) with utilizing direct modulation of a quantum cascade laser instead of external modulators is presented....

Hangauer, Andreas; Spinner, Georg; Nikodem, Michal; Wysocki, Gerard

148

Dispersion of Cloud Droplet Size Distributions, Cloud Parameterization...  

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

Dispersion of Cloud Droplet Size Distributions, Cloud Parameterizations, and Indirect Aerosol Effects P. H. Daum and Y. Liu Brookhaven National Laboratory Upton, New York...

149

Update 4 to: A Dispersion Modeling Analysis of Downwash from...  

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

and maximum loads will not cause or contribute to exceedances of the National Ambient Air Quality Standards (NAAQS). Update 4 to: A Dispersion Modeling Analysis of Downwash...

150

Nanocrystal formation via yttrium ion implantation into sapphire  

SciTech Connect (OSTI)

Ion implantation has been used to form nanocrystals in the near surface of single crystal {alpha}-Al{sub 2}O{sub 3}. The ion fluence was 5 x 10{sup 16} Y{sup +}/cm{sup 2}, and the implant energies investigated were 100, 150, and 170 keV. The morphology of the implanted region was investigated using transmission electron microscopy, x-ray energy dispersive spectroscopy, Rutherford backscattering spectroscopy and ion channeling. The implantation causes the formation of an amorphous surface layer which contains spherical nanosized crystals with a diameter of {approximately}13 nm. The nanocrystals are randomly oriented and exhibit a face-centered cubic structure with a lattice parameter of {approximately}4.1 A {+-} .02 A. Preliminary chemical analysis shows that these nanocrystals are rich in aluminum and yttrium and poor in oxygen relative to the amorphous matrix.

Hunt, E.M.; Hampikian, J.M. [Georgia Institute of Technology, Atlanta, GA (United States). School of Materials Science and Engineering; Poker, D.B. [Oak Ridge National Lab., TN (United States). Solid State Div.

1995-12-31T23:59:59.000Z

151

Drift and ion acoustic wave driven vortices with superthermal electrons  

SciTech Connect (OSTI)

Linear and nonlinear analysis of coupled drift and acoustic mode is presented in an inhomogeneous electron-ion plasma with {kappa}-distributed electrons. A linear dispersion relation is found which shows that the phase speed of both the drift wave and the ion acoustic wave decreases in the presence of superthermal electrons. Several limiting cases are also discussed. In the nonlinear regime, stationary solutions in the form of dipolar and monopolar vortices are obtained. It is shown that the condition for the boundedness of the solution implies that the speed of drift wave driven vortices reduces with increase in superthermality effect. Ignoring density inhomogeniety, it is investigated that the lower and upper limits on the speed of the ion acoustic driven vortices spread with the inclusion of high energy electrons. The importance of results with reference to space plasmas is also pointed out.

Ali Shan, S. [Theoretical Plasma Physics Division, PINSTECH, P.O. Nilore, Islamabad (Pakistan); National Centre For Physics (NCP), Shahdra Valley Road, QAU Campus, 44000 Islamabad (Pakistan); Pakistan Institute of Engineering and Applied Sciences (PIEAS), Islamabad (Pakistan); Haque, Q. [Theoretical Plasma Physics Division, PINSTECH, P.O. Nilore, Islamabad (Pakistan); National Centre For Physics (NCP), Shahdra Valley Road, QAU Campus, 44000 Islamabad (Pakistan)

2012-08-15T23:59:59.000Z

152

High Current Ion Sources and Injectors for Heavy Ion Fusion  

E-Print Network [OSTI]

on Heavy Ion Inertial Fusion; Fusion Engineering and Design,Ion Inertial Fusion, Princeton, New Jersey, Sept. 6-9, 1995; in Fusion EngineeringIon Inertial Fusion, Princeton, New Jersey, Sept. 6-9, 1995; in Fusion Engineering

Kwan, Joe W.

2005-01-01T23:59:59.000Z

153

Negative ion detachment processes  

SciTech Connect (OSTI)

This paper discusses the following topics: H{sup {minus}} and D{sup {minus}} collisions with atomic hydrogen; collisional decomposition of SF{sub 6}{sup {minus}}; two-electron loss processes in negative ion collisions; associative electron detachment; and negative ion desorption from surfaces.

Champion, R.L.; Doverspike, L.D.

1990-10-01T23:59:59.000Z

154

Selective ion source  

DOE Patents [OSTI]

A ion source is described wherein selected ions maybe extracted to the exclusion of unwanted ion species of higher ionization potential. Also described is a method of producing selected ions from a compound, such as P{sup +} from PH{sub 3}. The invention comprises a plasma chamber, an electron source, a means for introducing a gas to be ionized by electrons from the electron source, means for limiting electron energy from the electron source to a value between the ionization energy of the selected ion species and the greater ionization energy of an unwanted ion specie, and means for extracting the target ion specie from the plasma chamber. In one embodiment, the electrons are generated in a plasma cathode chamber immediately adjacent to the plasma chamber. A small extractor draws the electrons from the plasma cathode chamber into the relatively positive plasma chamber. The energy of the electrons extracted in this manner is easily controlled. The invention is particularly useful for doping silicon with P{sup +}, As{sup +}, and B{sup +} without the problematic presence of hydrogen, helium, water, or carbon oxide ions. Doped silicon is important for manufacture of semiconductors and semiconductor devices. 6 figs.

Leung, K.N.

1996-05-14T23:59:59.000Z

155

Selective ion source  

DOE Patents [OSTI]

A ion source is described wherein selected ions maybe extracted to the exclusion of unwanted ion species of higher ionization potential. Also described is a method of producing selected ions from a compound, such as P.sup.+ from PH.sub.3. The invention comprises a plasma chamber, an electron source, a means for introducing a gas to be ionized by electrons from the electron source, means for limiting electron energy from the electron source to a value between the ionization energy of the selected ion species and the greater ionization energy of an unwanted ion specie, and means for extracting the target ion specie from the plasma chamber. In one embodiment, the electrons are generated in a plasma cathode chamber immediately adjacent to the plasma chamber. A small extractor draws the electrons from the plasma cathode chamber into the relatively positive plasma chamber. The energy of the electrons extracted in this manner is easily controlled. The invention is particularly useful for doping silicon with P.sup.+, AS.sup.+, and B.sup.+ without the problematic presence of hydrogen, helium, water, or carbon oxide ions. Doped silicon is important for manufacture of semiconductors and semiconductor devices.

Leung, Ka-Ngo (Hercules, CA)

1996-01-01T23:59:59.000Z

156

Effects of a sheared ion velocity on the linear stability of ITG modes  

SciTech Connect (OSTI)

The linear dispersion of the ion temperature gradient (ITG) modes, in the presence of a non uniform background ion velocity U(parallel sign) U(parallel sign)(x) ez, in the direction of the sheared equilibrium magnetic field B0 = B0(x) ez, has been studied in the frame of the two-fluid guiding center approximation, in slab geometry. Generally speaking, the presence of an ion flow destabilizes the oscillations. The role of the excited K-H instability is discussed.

Lontano, M.; Lazzaro, E. [Istituto di Fisica del Plasma, C.N.R., Euratom-ENEA-CNR Association, Milan (Italy); Varischetti, M. C. [Istituto di Fisica del Plasma, C.N.R., Euratom-ENEA-CNR Association, Milan (Italy); Dipartimento di Fisica, Universita degli Studi di Milano, Milan (Italy)

2006-11-30T23:59:59.000Z

157

Lithium Ion Accomplishments  

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

Lithium ion Battery Commercialization Lithium ion Battery Commercialization Johnson Controls-Saft Advanced Power Solutions, of Milwaukee, Wisconsin: Johnson Controls-Saft (JCS) will supply lithium-ion batteries to Mercedes for their S Class Hybrid to be introduced in October 2009. Technology developed with DOE support (the VL6P cell) will be used in the S Class battery. In May 2006, the Johnson Controls-Saft Joint Venture was awarded a 24 month $14.4 million contract by the DOE/USABC to develop a 40kW Li ion HEV battery system offering improved safety, low temperature performance, and cost. JCS has reported a 40% cost reduction of the 40kW system being developed in their DOE/USABC contract while maintaining performance. Lithium Ion Battery Material Commercialization Argonne National Laboratory has licensed cathode materials and associated processing

158

Ion mobility sensor system  

DOE Patents [OSTI]

An ion mobility sensor system including an ion mobility spectrometer and a differential mobility spectrometer coupled to the ion mobility spectrometer. The ion mobility spectrometer has a first chamber having first end and a second end extending along a first direction, and a first electrode system that generates a constant electric field parallel to the first direction. The differential mobility spectrometer includes a second chamber having a third end and a fourth end configured such that a fluid may flow in a second direction from the third end to the fourth end, and a second electrode system that generates an asymmetric electric field within an interior of the second chamber. Additionally, the ion mobility spectrometer and the differential mobility spectrometer form an interface region. Also, the first end and the third end are positioned facing one another so that the constant electric field enters the third end and overlaps the fluid flowing in the second direction.

Xu, Jun; Watson, David B.; Whitten, William B.

2013-01-22T23:59:59.000Z

159

Kr ion irradiation study of the depleted-uranium alloys.  

SciTech Connect (OSTI)

Fuel development for the reduced enrichment research and test reactor (RERTR) program is tasked with the development of new low enrichment uranium nuclear fuels that can be employed to replace existing high enrichment uranium fuels currently used in some research reactors throughout the world. For dispersion type fuels, radiation stability of the fuel-cladding interaction product has a strong impact on fuel performance. Three depleted-uranium alloys are cast for the radiation stability studies of the fuel-cladding interaction product using Kr ion irradiation to investigate radiation damage from fission products. SEM analysis indicates the presence of the phases of interest: U(Al, Si){sub 3}, (U, Mo)(Al, Si){sub 3}, UMo{sub 2}Al{sub 20}, U{sub 6}Mo{sub 4}Al{sub 43} and UAl{sub 4}. Irradiations of TEM disc samples were conducted with 500 keV Kr ions at 200 C to ion doses up to 2.5 x 10{sup 19} ions/m{sup 2} ({approx}10 dpa) with an Kr ion flux of 10{sup 16} ions/m{sup 2}/s ({approx}4.0 x 10{sup -3} dpa/s). Microstructural evolution of the phases relevant to fuel-cladding interaction products was investigated using transmission electron microscopy.

Gan, J.; Keiser, D. D.; Miller, B. D.; Kirk, M. A.; Rest, J.; Allen, T. R.; Wachs, D. M. (Materials Science Division); (INL); (Univ. of Wisconsin)

2010-12-01T23:59:59.000Z

160

Kr Ion Irradiation Study of the Depleted-Uranium Alloys  

SciTech Connect (OSTI)

Fuel development for the Reduced Enrichment Research and Test Reactor program is tasked with the development of new low-enriched uranium nuclear fuels that can be employed to replace existing highly enriched uranium fuels currently used in some research reactors throughout the world. For dispersion-type fuels, radiation stability of the fuel/cladding interaction product has a strong impact on fuel performance. Three depleted uranium alloys are cast for the radiation stability studies of the fuel/cladding interaction product using Kr ion irradiation to investigate radiation damage from fission products. SEM analysis indicates the presence of the phases of interest: U(Si, Al)3, (U, Mo)(Si, Al)3, UMo2Al20, U6Mo4Al43, and UAl4. Irradiations of TEM disc samples were conducted with 500 keV Kr ions at 200C to ion doses up to 2.5 1015 ions/cm2 (~ 10 dpa) with an Kr ion flux of 1012 ions/cm2-sec (~ 4.0 10-3 dpa/sec). Microstructural evolution of the phases relevant to fuel-cladding interaction products was investigated using transmission electron microscopy.

J. Gan; D. Keiser; B. Miller; M. Kirk; J. Rest; T. Allen; D. Wachs

2010-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "ion dispersion thermochronometry" 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

Nitridation of zirconium using energetic ions from plasma focus device  

Science Journals Connector (OSTI)

The nitridation of zirconium disks is achieved by irradiating energetic nitrogen ions from 2.3kJ plasma focus device using multiple focus deposition shots (10, 20, 30 and 40) at different angular positions with respect to the anode axis. The X-ray diffraction analysis reveals the evolution of ZrN, Zr2N and Zr3N4 phases of zirconium nitride depending upon the ion energy flux and angular positions. The crystallite size of ZrN and Zr2N phases increases by increasing the number of focus deposition shots. The residual stresses estimated for Zr (101), ZrN (111) and ZrN (200) phases are maximum in the nitrided surfaces at lower nitrogen ion dose, decreases as the nitrogen ion dose increases. The field emission scanning electron microscopy results exhibit the uniform and smooth film of zirconium nitride with granular surface morphology at 10 angular position. The energy dispersive X-rays spectroscopy data indicate that nitrogen content in the film is improved for higher nitrogen ion dose while reduced at larger angular positions. The Vickers microhardness of the film is enhanced up to 400%. The microhardness increases by increasing the nitrogen ion dose and decreases rapidly by increasing the angular position.

I.A. Khan; M. Hassan; R. Ahmad; A. Qayyum; G. Murtaza; M. Zakaullah; R.S. Rawat

2008-01-01T23:59:59.000Z

162

Secondary ion coincidence in highly charged ion based secondary ion mass spectroscopy for process characterization  

SciTech Connect (OSTI)

Coincidence counting in highly charged ion based secondary ion mass spectroscopy has been applied to the characterization of selective tungsten deposition via disilane reduction of tungsten hexafluoride on a patterned SiO{sub 2}/Si wafer. The high secondary ion yield and the secondary ion emission from a small area produced by highly charged ions make the coincidence technique very powerful.

Hamza, A.V.; Schenkel, T.; Barnes, A.V.; Schneider, D.H. [Lawrence Livermore National Laboratory, University of California, Livermore, California, 94551 (United States)] [Lawrence Livermore National Laboratory, University of California, Livermore, California, 94551 (United States)

1999-01-01T23:59:59.000Z

163

SIMS methodology for probing the fate and dispersion of catalytically active molecules  

Science Journals Connector (OSTI)

Abstract Secondary ion mass spectrometry (SIMS) with 520keV A u 400 4 + projectiles operating in event-by-event bombardment/detection mode was applied to investigate pyrolized mixtures of catalyst (vitamin B12) and carbon supports (carbon black). The specimens are alternative cathode materials to platinum for fuel cells. The goal was to understand the effect of temperature on the chemical environment of the catalytically active sites formed on the carbon supports during pyrolysis. The A u 400 4 + projectiles probed the samples one-at-a-time in a stochastic manner and the resulting secondary ions from the individual impacts were recorded separately. The coincidental methodology allows one to compile mass spectra comprising selectively the secondary ions from the impacts on the active sites, extracting the local molecular information of the active sites within a nanodomain (?103nm3). The detection of CoN 4 C x ? suggests Co-N4 be the moiety retained from the pyrolized vitamin B12 in the presence of the carbon black. Variations in the local chemical environment of the active sites as a function of pyrolysis temperature were also observed. Additionally, we could quantify the dispersion of the active sites among the carbon supports, a measure providing a direction for future device optimization.

Chao-Kai Liang; Sun-Tang Chang; Stanislav V. Verkhoturov; Li-Chyong Chen; Kuei-Hsien Chen; Emile A. Schweikert

2014-01-01T23:59:59.000Z

164

Nonperturbative theory for the dispersion self-energy of atoms  

Science Journals Connector (OSTI)

We go beyond the approximate series expansions used in the dispersion theory of finite-size atoms. We demonstrate that a correct, and nonperturbative, theory dramatically alters the dispersion self-energies of atoms. The nonperturbed theory gives as much as 100% corrections compared to the traditional series-expanded theory for the smaller noble gas atoms.

Priyadarshini Thiyam; C. Persson; I. Brevik; Bo E. Sernelius; Mathias Bostrm

2014-11-14T23:59:59.000Z

165

Synthesis of dispersed surface waves by means of Fourier transform  

Science Journals Connector (OSTI)

...50T 60r Angular velocity in degree/~usec Fig. 5. Dispersion curve obtained by...I .01 . I .5 Frequency in cycle/,usec Fig. 6. Dispersion curve obtained by...of Fourier transform. ~ - ~ - - ~ SO ~usec O0 i -" i ";'".-.-i , , I...

Yasuo Sat

166

Phonon dispersion of carbon nanotubes J. Maultzscha,*, S. Reicha  

E-Print Network [OSTI]

Phonon dispersion of carbon nanotubes J. Maultzscha,*, S. Reicha , C. Thomsena , E. Dobardz the phonon dispersion relations of single-wall carbon nanotubes calculated within a force-constants approach 6 and 12 cm21 independent of the tube diameter. The order of the high-energy modes at the G

Nabben, Reinhard

167

Demonstration of Electrical Dispersion Compensation of Single Sideband Optical Transmission  

E-Print Network [OSTI]

Demonstration of Electrical Dispersion Compensation of Single Sideband Optical Transmission P. M describe a demonstration of electrical chromatic dispersion compensation of 10 Gb/s single sideband optical signals. Eye-opening and bit error rates of less than 10-10 were achieved after compensation of -2040 ps

Haddadi, Hamed

168

A study of micro fiber dispersion using digital image analysis  

E-Print Network [OSTI]

of this dissertation is to investigate the use of texture analysis as a tool to micro fiber dispersion measurement. Micro fiber dispersion can be found in many applications such as in paper and industry powder engineering. Three cases related to micro fiber...

Hendrarsakti, Jooned

2004-11-15T23:59:59.000Z

169

Comment on "Mode Conversion of Waves In The Ion-Cyclotron Frequency Range in Magnetospheric Plasmas"  

SciTech Connect (OSTI)

Recently, Kazakov and Fulop [1] studied mode conversion (MC) at the ion-ion hybrid (IIH) resonance in planetary magnetospheric plasmas by simplifying the dispersion relation of the fast wave (FW) modes to describe a cutoff-resonance (CR) pair near the IIH resonance, which can be reduced to a Budden problem. They suggested that when the IIH resonance frequency (?S) approaches the crossover frequency (?cr), and the parallel wavenumber (k?) is close to the critical wavenumber k? ?(?S = ?cr), MC can be efficient for arbitrary heavy ion density ratios. In this Comment, we argue that (a) the FW dispersion relation cannot be simplified to the CR pair especially near ?cr because in many parameter regimes there is a cutoff-resonance-cutoff (CRC) triplet that completely changes the wave absorption; and (b) the maximum MC efficiency does not always occur near k? ?#25; k???.

Kim, Eun

2014-02-28T23:59:59.000Z

170

Mode conversion and absorption of fast waves at high ion cyclotron harmonics in inhomogeneous magnetic fields  

SciTech Connect (OSTI)

The propagation and absorption of high harmonic fast waves is of interest for non-inductive current drives in fusion experiments. The fast wave can be coupled with the ion Bernstein wave that propagates in the high magnetic field side of an ion cyclotron harmonic resonance layer. This coupling and the absorption are analyzed using the hot plasma dispersion relation and a wave equation that was converted from an approximate dispersion relation for the case where ?{sub i}=k{sub ?}{sup 2}?{sub i}{sup 2}/2?1 (where k{sub ?} is the perpendicular wave number and ?{sub i} is the ion Larmor radius). It is found that both reflection and conversion may occur near the harmonic resonance layer but that they decrease rapidly, giving rise to a sharp increase in the absorption as the parallel wave number increases.

Cho, Suwon, E-mail: swcho@kgu.ac.kr [Department of Physics, Kyonggi University, Suwon, Kyonggi-Do 443-760 (Korea, Republic of)] [Department of Physics, Kyonggi University, Suwon, Kyonggi-Do 443-760 (Korea, Republic of); Kwak, Jong-Gu [National Fusion Research Institute, Daejeon 305-806 (Korea, Republic of)] [National Fusion Research Institute, Daejeon 305-806 (Korea, Republic of)

2014-04-15T23:59:59.000Z

171

Theory of waves in pair-ion plasmas: Natural explanation of backward modes  

SciTech Connect (OSTI)

Backward waves observed in the experiments by Oohara and Hatakeyama (Phys. Rev. Lett. 91, 205005 (2003)) are identified to be ion cyclotron harmonic waves inherent to the kinetic theory. The derived dispersion equation is based on exact solutions of the characteristic equations of the Vlasov equation in a bounded cylindrical coordinate system; it is different from its counterpart in unbounded plasmas, and it provides all the branches of the dispersion relations observed in the experiment. Positive and negative ions respond to a potential in the same time scale and cooperate to expose kinetic orbital behaviors to the macroscopic propagation characteristics. In addition, the experimental setting of the large Larmor radius makes higher harmonic ion cyclotron backward/forward waves observable. The large Larmor radius effects are naturally treated by a kinetic theory.

Kono, M. [Faculty of Policy Studies, Chuo University, Tokyo (Japan)] [Faculty of Policy Studies, Chuo University, Tokyo (Japan); Vranjes, J. [Institute of Physics, Belgrade (Serbia)] [Institute of Physics, Belgrade (Serbia); Batool, N. [National Center for Physics, Islamabad (Pakistan)] [National Center for Physics, Islamabad (Pakistan)

2013-12-15T23:59:59.000Z

172

TVDG Ion Species  

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

Most Commonly Used Ions Most Commonly Used Ions Many other ions can be produced if required. Due to the number of available ions we have to know, in advance, what ions and LETs you plan to use. Please use the Time Request fill-in form to let us know which ions you will be using. In addition to the maximum energies, ranges and corresponding LETs listed below, lower energies are available for each ion. Charts for range and LET values as a function of energy can be seen by clicking on the links in the LET columns. Flux can be in the range of 1 particle/cm2/sec to greater than 1 · 106 particles/cm2/sec. In Silicon High LET Summary Low LET Summary In GaAs High LET Summary Low LET Summary How To Use The Charts Below Mass Max Energy Surface LET Range Surface LET Range Z Symbol AMU MeV MeV

173

Optical pumping of ions  

Science Journals Connector (OSTI)

Radiofrequency spectroscopy has been extended to positive ions with S ground states by means of optical pumping. The ions are stored in buffer gases or ion traps and are polarized directly by optical pumping or indirectly by spin exchange, change exchange, or Penning ionization with optically pumped atoms. The applied methods are described. The experiments can be divided into two categories: Collisional interactions of the polarized ions are investigated, like the exchange processes mentioned above, spin exchange with free electrons, spin depolarization and hyperfine density shifts in rare gases. For the two latter effects drastic differences are observed between atomic and ionic 2S12 states the explanations of which reveal the influence of the ionic charge on the interactions. The comparison of equivalent processes involving isoelectronic 2S or 2P configurations of atoms and ions provides a test of current collision theories. Precision rf spectroscopy of ionic ground states yields the 2S12 hyperfine structure splittings of 3He+ and group II ions with relative accuracies of up to 10?9, with further improvement possible. Direct and indirect optical pumping of 1S0 ions is used to determine nuclear magnetic moments, diamagnetic shielding coefficients, and chemical shifts. Applications and further developments of the present methods are discussed.

E.W. Weber

1977-01-01T23:59:59.000Z

174

Theory of the ion-channel laser  

SciTech Connect (OSTI)

A relativistic electron beam propagating through a plasma in the ion-focussed regime exhibits an electromagnetic instability with peak growth rate near a resonant frequency {omega}{approximately}2 {gamma}{sup 2} {omega}{beta}, where {gamma} is the Lorentz factor and {omega}{beta} is the betatron frequency. The physical basis for this instability is that an ensemble of relativistic simple harmonic oscillators, weakly driven by an electromagnetic wave, will lose energy to the wave through axial bunching. This bunching'' corresponds to the development of an rf component in the beam current, and a coherent centroid oscillation. The subject of this thesis is the theory of a laser capitalizing on this electromagnetic instability. A historical perspective is offered. The basic features of relativistic electron beam propagation in the ion-focussed regime are reviewed. The ion-channel laser (ICL) instability is explored theoretically through an eikonal formalism, analgous to the KMR'' formalism for the free-electron laser (FEL). The dispersion relation is derived, and the dependence of growth rate on three key parameters is explored. Finite temperature effects are assessed. From this work it is found that the typical gain length for amplification is longer than the Rayleigh length and we go on to consider three mechanisms which will tend to guide waveguide. First, we consider the effect of the ion channel as a dielectric waveguide. We consider next the use of a conducting waveguide, appropriate for a microwave amplifier. Finally, we examine a form of optical guiding'' analgous to that found in the FEL. The eikonal formalism is used to model numerically the instability through and beyond saturation. Results are compared with the numerical simulation of the full equations of motion, and with the analytic scalings. The analytical requirement on detuning spread is confirmed.

Whittum, D.H.

1990-09-01T23:59:59.000Z

175

Relating to ion detection  

DOE Patents [OSTI]

The apparatus and method provide a technique for improving detection of alpha and/or beta emitting sources on items or in locations using indirect means. The emission forms generate ions in a medium surrounding the item or location and the medium is then moved to a detecting location where the ions are discharged to give a measure of the emission levels. To increase the level of ions generated and render the system particularly applicable for narrow pipes and other forms of conduits, the medium pressure is increased above atmospheric pressure. STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

Orr, Christopher Henry (Calderbridge, GB); Luff, Craig Janson (Calderbridge, GB); Dockray, Thomas (Calderbridge, GB); Macarthur, Duncan Whittemore (Los Alamos, NM)

2001-01-01T23:59:59.000Z

176

Electroacoustics of Particles Dispersed in Polymer Gel  

SciTech Connect (OSTI)

This study examines the acoustic electrophoresis of particles dispersed in polymer hydrogels, with the particle size either less than or greater than the gel mesh size. When the particles are smaller than the gel mesh size, their acoustic vibration is resisted by only the background water medium, and the measured dynamic electrophoretic mobility, ?d (obtained in terms of colloid vibration current, CVI), is the same as in water. For the case of particles larger than the gel mesh size, ?d is decreased due to trapping, and the net decrease depends on the viscoelastic properties of the gel. The gel mesh size was varied by varying its crosslink density, the latter being characterized as the storage modulus, G. The dependence of mobility on G, for systems of a given particle size, and on particle size, for gels of a given G, are investigated. The measured mobility remains constant as G is increased (i.e., mesh size is decreased) up to a value of approximately 300 Pa, beyond which it decreases. In the second set of measurements, the trapped particle size was increased in a gel medium of constant mesh size, with G approximately 100 Pa. In this case, the measured ?d is found to be effectively constant over the particle size range studied (14-120 nm), i.e., it is independent of the degree of trapping as expressed by the ratio of the particle size to the mesh size.

Bhosale, Prasad S.; Chun, Jaehun; Berg, John C.

2011-06-27T23:59:59.000Z

177

Two-point derivative dispersion relations  

E-Print Network [OSTI]

A new derivation is given for the representation, under certain conditions, of the integral dispersion relations of scattering theory through local forms. The resulting expressions have been obtained through an independent procedure to construct the real part, and consist of new mathematical structures of double infinite summations of derivatives. In this new form the derivatives are calculated at the generic value of the energy $E$ and separately at the reference point $E=m$ that is the lower limit of the integration. This new form may be more interesting in certain circumstances and directly shows the origin of the difficulties in convergence that were present in the old truncated forms called standard-DDR. For all cases in which the reductions of the double to single sums were obtained in our previous work, leading to explicit demonstration of convergence, these new expressions are seen to be identical to the previous ones. We present, as a glossary, the most simplified explicit results for the DDR's in the cases of imaginary amplitudes of forms $(E/m)^\\lambda[\\ln (E/m)]^n$, that cover the cases of practical interest in particle physics phenomenology at high energies. We explicitly study the expressions for the cases with $\\lambda$ negative odd integers, that require identification of cancelation of singularities, and provide the corresponding final results.

Erasmo Ferreira; Javier Sesma

2014-03-24T23:59:59.000Z

178

Saturation of multi-laser beams laser-plasma instabilities from stochastic ion heating  

SciTech Connect (OSTI)

Cross-beam energy transfer (CBET) has been used as a tool on the National Ignition Facility (NIF) since the first energetics experiments in 2009 to control the energy deposition in ignition hohlraums and tune the implosion symmetry. As large amounts of power are transferred between laser beams at the entrance holes of NIF hohlraums, the presence of many overlapping beat waves can lead to stochastic ion heating in the regions where laser beams overlap [P. Michel et al., Phys. Rev. Lett. 109, 195004 (2012)]. This increases the ion acoustic velocity and modifies the ion acoustic waves dispersion relation, thus reducing the plasma response to the beat waves and the efficiency of CBET. This pushes the plasma oscillations driven by CBET in a regime where the phase velocities are much smaller than both the electron and ion thermal velocities. CBET gains are derived for this new regime and generalized to the case of multi ion species plasmas.

Michel, P.; Williams, E. A.; Divol, L.; Berger, R. L.; Glenzer, S. H.; Callahan, D. A. [Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)] [Lawrence Livermore National Laboratory, Livermore, California 94551 (United States); Rozmus, W. [Theoretical Physics Institute, University of Alberta, Edmonton, Alberta T6G2G7 (Canada) [Theoretical Physics Institute, University of Alberta, Edmonton, Alberta T6G2G7 (Canada); Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)

2013-05-15T23:59:59.000Z

179

Modelling long-distance seed dispersal in heterogeneous landscapes.  

SciTech Connect (OSTI)

1. Long-distance seed dispersal is difficult to measure, yet key to understanding plant population dynamics and community composition. 2. We used a spatially explicit model to predict the distribution of seeds dispersed long distances by birds into habitat patches of different shapes. All patches were the same type of habitat and size, but varied in shape. They occurred in eight experimental landscapes, each with five patches of four different shapes, 150 m apart in a matrix of mature forest. The model was parameterized with smallscale movement data collected from field observations of birds. In a previous study we validated the model by testing its predictions against observed patterns of seed dispersal in real landscapes with the same types and spatial configuration of patches as in the model. 3. Here we apply the model more broadly, examining how patch shape influences the probability of seed deposition by birds into patches, how dispersal kernels (distributions of dispersal distances) vary with patch shape and starting location, and how movement of seeds between patches is affected by patch shape. 4. The model predicts that patches with corridors or other narrow extensions receive higher numbers of seeds than patches without corridors or extensions. This pattern is explained by edgefollowing behaviour of birds. Dispersal distances are generally shorter in heterogeneous landscapes (containing patchy habitat) than in homogeneous landscapes, suggesting that patches divert the movement of seed dispersers, holding them long enough to increase the probability of seed defecation in the patches. Dispersal kernels for seeds in homogeneous landscapes were smooth, whereas those in heterogenous landscapes were irregular. In both cases, long-distance (> 150 m) dispersal was surprisingly common, usually comprising approximately 50% of all dispersal events. 5. Synthesis . Landscape heterogeneity has a large influence on patterns of long-distance seed dispersal. Our results suggest that long-distance dispersal events can be predicted using spatially explicit modelling to scale-up local movements, placing them in a landscape context. Similar techniques are commonly used by landscape ecologists to model other types of movement; they offer much promise to the study of seed dispersal.

Levey, Douglas, J.; Tewlsbury, Joshua, J.; Bolker, Benjamin, M.

2008-01-01T23:59:59.000Z

180

HEAVY ION INERTIAL FUSION  

E-Print Network [OSTI]

Accelerators as Drivers for Inertially Confined Fusion, W.B.LBL-9332/SLAC-22l (1979) Fusion Driven by Heavy Ion Beams,OF CALIFORNIA f Accelerator & Fusion Research Division

Keefe, D.

2008-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ion dispersion thermochronometry" 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

Focused ion beam system  

DOE Patents [OSTI]

A focused ion beam (FIB) system produces a final beam spot size down to 0.1 {mu}m or less and an ion beam output current on the order of microamps. The FIB system increases ion source brightness by properly configuring the first (plasma) and second (extraction) electrodes. The first electrode is configured to have a high aperture diameter to electrode thickness aspect ratio. Additional accelerator and focusing electrodes are used to produce the final beam. As few as five electrodes can be used, providing a very compact FIB system with a length down to only 20 mm. Multibeamlet arrangements with a single ion source can be produced to increase throughput. The FIB system can be used for nanolithography and doping applications for fabrication of semiconductor devices with minimum feature sizes of 0.1 m or less. 13 figs.

Leung, K.; Gough, R.A.; Ji, Q.; Lee, Y.Y.

1999-08-31T23:59:59.000Z

182

Ion Channels as Devices  

Science Journals Connector (OSTI)

Ion channels are proteins with a hole down ... biological function. Channels are devices in the engineering sense of the word and engineering analysis helps understand their function. In particular ... The curren...

Bob Eisenberg

2003-12-01T23:59:59.000Z

183

Ion manipulation device  

DOE Patents [OSTI]

An ion manipulation method and device is disclosed. The device includes a pair of substantially parallel surfaces. An array of inner electrodes is contained within, and extends substantially along the length of, each parallel surface. The device includes a first outer array of electrodes and a second outer array of electrodes. Each outer array of electrodes is positioned on either side of the inner electrodes, and is contained within and extends substantially along the length of each parallel surface. A DC voltage is applied to the first and second outer array of electrodes. A RF voltage, with a superimposed electric field, is applied to the inner electrodes by applying the DC voltages to each electrode. Ions either move between the parallel surfaces within an ion confinement area or along paths in the direction of the electric field, or can be trapped in the ion confinement area.

Anderson, Gordon A; Smith, Richard D; Ibrahim, Yehia M; Baker, Erin M

2014-09-16T23:59:59.000Z

184

Ion electric propulsion unit  

DOE Patents [OSTI]

An electron cyclotron resonance (ECR) thruster is disclosed having a plasma chamber which is electrically biased with a positive voltage. The chamber bias serves to efficiently accelerate and expel the positive ions from the chamber. Electrons follow the exiting ions, serving to provide an electrically neutral exhaust plume. In a further embodiment, a downstream shaping magnetic field serves to further accelerate and/or shape the exhaust plume.

Light, Max E; Colestock, Patrick L

2014-01-28T23:59:59.000Z

185

Stabilisation of titania pigment particles with anionic polymeric dispersants  

Science Journals Connector (OSTI)

The stabilisation of titania pigment in dry water-based paint films with anionic polymeric dispersants containing carboxylate groups was investigated. The results were compared to those obtained from rheological analysis of titania pigment suspensions. The polymeric dispersants chosen were polyacrylic acid and polyacrylamides copolymer modified with carboxylate groups. AFM and TEM were used to assess the distribution of the titania pigment particles in the surface and bulk, respectively, of the paint films which were then compared to the gloss and surface roughness of these films. In the absence of a dispersant, the pigment distribution in the paint films was not uniform and relatively large pigment aggregates appeared at the surface, resulting in a rough surface and low gloss. However, anionic polymeric dispersants decreased surface roughness and increased the gloss of the dry paint films, with the dispersant concentration considerably enhancing pigment distribution in the paint films. An inverse correlation of paint film gloss with surface roughness was observed. The optimum pigment distribution in the dry state was found at dispersant concentrations much higher than those needed to obtain minimum yield stress in aqueous suspensions. This suggests that in the dry state, electrostatic stabilisation is substantially reduced or possibly absent, therefore a higher dispersant concentration is needed to achieve pigment stabilisation.

Saeed Farrokhpay; Gayle E. Morris; Daniel Fornasiero; Peter Self

2010-01-01T23:59:59.000Z

186

Remarks on the concept of dispersion in a curved linac  

SciTech Connect (OSTI)

A next-generation linear collider is expected to span tens of kilometers in length. For various reasons, it may be desirable to house such an accelerator in a tunnel that follows the earth's curvature rather that in a 'laser-straight' tunnel. One side effect of opting for a curved linac is the introduction of vertical dispersion. In recent years, much work has been dedicated to understand and evaluate the impact of the presence of dispersion on emittance preservation. While performing simulations with our in-house code (CHEF) we observed a discrepancy between the dispersion function it produces and that computed using other codes in use within the accelerator community. Understanding the origin and the meaning of this discrepancy required a re-examination of the meaning of the concept of dispersion in the context of a linac. The object of this note is to document our findings. We establish that the default dispersion algorithm used by CHEF corresponds to a different, and ultimately more appropriate, definition of the dispersion in presence of acceleration. Not surprisingly, a consistent definition of dispersion restores agreement between codes.

Ostiguy, Jean-Francois; /Fermilab

2009-01-01T23:59:59.000Z

187

Ion optics of RHIC EBIS  

SciTech Connect (OSTI)

RHIC EBIS has been commissioned to operate as a versatile ion source on RHIC injection facility supplying ion species from He to Au for Booster. Except for light gaseous elements RHIC EBIS employs ion injection from several external primary ion sources. With electrostatic optics fast switching from one ion species to another can be done on a pulse to pulse mode. The design of an ion optical structure and the results of simulations for different ion species are presented. In the choice of optical elements special attention was paid to spherical aberrations for high-current space charge dominated ion beams. The combination of a gridded lens and a magnet lens in LEBT provides flexibility of optical control for a wide range of ion species to satisfy acceptance parameters of RFQ. The results of ion transmission measurements are presented.

Pikin, A.; Alessi, J.; Beebe, E.; Kponou, A.; Okamura, M.; Raparia, D.; Ritter, J.; Tan, Y.; Kuznetsov, G.

2011-09-10T23:59:59.000Z

188

Ettringite surface chemistry: Interplay of electrostatic and ion specificity  

Science Journals Connector (OSTI)

This paper presents a detailed experimental study combined with Monte Carlo (MC) simulations within the primitive model of the physical chemistry at the ettringitewater interface over a wide range of pH and bulk conditions for which ettringite exists thanks to its solubility in aqueous solutions. Ettringite, which is an important phase in hydrated cement-based systems, bears a permanent and positive structural charge. In contrast with previous studies, electrokinetic measurements together with the careful chemical analysis of the equilibrium solutions of the dispersions have brought strong support to designate sulfate as being the ion determining the potential. Simulations showed that electrostatics, through ionion correlations, are not strong enough to explain the charge reversal of ettringite immersed in sulfate salt solutions. However, an excellent agreement between simulated and experimental data was obtained including a short-range nonelectrostatic adsorption potential for the sulfate ion. This result strongly suggests the existence of a chemical specificity of sulfate ions for an ettringite surface.

Marta Medala; Christophe Labbez; Isabelle Pochard; Andr Nonat

2011-01-01T23:59:59.000Z

189

Heavy Ions - Cyclotron  

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

Heavy Ions Heavy Ions Heavy ions used at the BASE Facility are accelerated in the form of "cocktails," named because of the fact that several heavy ions with the same mass-to-charge ratio are sent into the Cyclotron, which accelerates the ions while acting as a precision mass separator. The Control Room Operator then uses Cyclotron frequency to select only the desired ion, a process that takes about 2 minutes. We provide four standard cocktails: 4.5, 10, 16, and 30 MeV/nucleon. Depending on the cocktail, LETs from 1 to 100 MeV/(mg/cm^2) and flux levels of up to 1E7 ions/cm2-sec are available. Parts are tested in our vacuum chamber, and can be remotely positioned horizontally, vertically, or rotationally (y and z axes) with the motion table. An alignment laser is available to ensure the part is in the center of the beam. Mounting hardware is readily available. 12xBNC (F-F), 2x25-pin D (F-M or M-F), 4x40-pin flat ribbon (M-M), 4x50-pin flat ribbon (M-M), 12xSMA (F-F), and 2xEthernet vacuum feedthroughs are mounted upon request. (The 4x40-pin and 4x50-pin flat ribbon connectors are wired straight across, so you will need a F-F adapter to correct the pin numbers to normal.) Holes are provided through the cave shielding blocks for connecting additional test equipment, with a distance of approximately 10 feet from vacuum feedthrough to the top of the shielding block.

190

Silane discharge ion chemistry  

SciTech Connect (OSTI)

Silane dc, rf, and dc proximity discharges have been studied using mass spectroscopic measurements of the positive ions as a detailed diagnostic for the type of discharge used to produce hydrogenated amorphous silicon solar photovoltaic cells. The properties and quality of these films depends in a very complex way upon the interactions of the many reactive neutral and ion species in the discharge. Qualitative models of the ion chemical processes in these discharges have been developed from experimental measurements. Knowledge of the ion-molecule and electron-molecule collision cross sections is important to any attempt at understanding silane discharge chemistry. Consequently, the electron impact ionization cross sections for silane and disilane have been measured and for comparison purposes also for methane and ethane. In addition, the rate coefficients for charge exchange reactions of He , Ne , and Ar with silane, disilane, methane, and ethane have been measured as these are important to understanding discharges in inert gas-silane mixtures. A detailed quantitative model of the cathode sheath region of a silane dc discharge has been developed by extending the best recent calculation of the electron motion in the sheath to a self-consistent form which includes the ion motion. This model is used with comparison of silane dc discharge data to diagnose the ion chemistry occurring in the sheath region of silane dc discharge. The understanding of the discharge ion chemical processes that have been gained in this study represent an important step toward understanding the chemical and physical processes leading to film growth.

Chatham, R.H. III

1984-01-01T23:59:59.000Z

191

Aeroassisted orbital transfer vehicle guidance performance in the presence of density dispersions  

E-Print Network [OSTI]

Dispersions Analytic Predictor-Corrector AV, Sensitivity to Step Dispersions Analytic Predictor-Corrector DV, Sensitivity to Spike Dispersions Energy Controller AV, Sensitivity to Step Dispersions 42 44 46 49 49 51 53 56 LIST OF FIGURES...-Corrector AV, Sensitivity to a 10000 foot Duration Step Dispersions . AV, Comparison for 0. 20 Magnitude, 10000 foot Duration, Step Dispersion HPC Bank Angle History for -20% Biased 1962 Standard Atmosphere Page 58 67 67 69 71 71 72 73 75 27...

Fitzgerald, Steve Matthew

2012-06-07T23:59:59.000Z

192

Atmospheric Dispersion Model Validation in Low Wind Conditions  

SciTech Connect (OSTI)

Atmospheric plume dispersion models are used for a variety of purposes including emergency planning and response to hazardous material releases, determining force protection actions in the event of a Weapons of Mass Destruction (WMD) attack and for locating sources of pollution. This study provides a review of previous studies that examine the accuracy of atmospheric plume dispersion models for chemical releases. It considers the principles used to derive air dispersion plume models and looks at three specific models currently in use: Aerial Location of Hazardous Atmospheres (ALOHA), Emergency Prediction Information Code (EPIcode) and Second Order Closure Integrated Puff (SCIPUFF). Results from this study indicate over-prediction bias by the EPIcode and SCIPUFF models and under-prediction bias by the ALOHA model. The experiment parameters were for near field dispersion (less than 100 meters) in low wind speed conditions (less than 2 meters per second).

Sawyer, Patrick

2007-11-01T23:59:59.000Z

193

Hair treatment process providing dispersed colors by light diffraction  

DOE Patents [OSTI]

Hair was coated with polymer-containing fluid and then hot pressed to form a composite of hair and a polymer film imprinted with a nanopattern. Polychromatic light incident on the nanopattern is diffracted into dispersed colored light.

Lamartine, Bruce Carvell; Orler, E. Bruce; Sutton, Richard Matthew Charles; Song, Shuangqi

2013-12-17T23:59:59.000Z

194

Enhanced Dispersion from Tall Stacks Near Modern Wind Mills  

Science Journals Connector (OSTI)

Dispersion modeling of emissions from tall stacks is often done with regulatory models, based on the Gaussian plume concept. When the plumes of tall stacks are influenced by the turbulence of nearby wind mills, t...

J. J. Erbrink; Luc Verhees

2014-01-01T23:59:59.000Z

195

Hair treatment process providing dispersed colors by light diffraction  

DOE Patents [OSTI]

Hair was coated with polymer-containing fluid and then hot pressed to form a composite of hair and a polymer film imprinted with a nanopattern. Polychromatic light incident on the nanopattern is diffracted into dispersed colored light.

Lamartine, Bruce Carvell; Orler, E. Bruce; Sutton, Richard Matthew Charles; Song, Shuangqi

2014-11-11T23:59:59.000Z

196

RELIABILITY OF WIND POWER FROM DISPERSED SITES: A PRELIMINARY ASSESSMENT  

E-Print Network [OSTI]

ON METHODOLOGY: FROM WIND POWER FREQUENCY TO LOSS-OF-LOADJ.P. , "Some Aspects of Wind Power Statistics, " J. of Appl.SCTION Reliability of Wind Power From Dispersed Sites: A Pr

Kahn, E.

2011-01-01T23:59:59.000Z

197

Structural characteristics, dispersion, and modification of fibrous brucite  

Science Journals Connector (OSTI)

Fibrous brucite has very unique structure and physical properties. Brucite fibers were exfoliated into single nanofibers by ... fiber has a consistent morphology, and fibrous brucite is dispersed and modified wit...

Xi Cao; Xiu-yun Chuan

2014-01-01T23:59:59.000Z

198

Nonphotochemical hole burning and dispersive kinetics in amorphous solids.  

E-Print Network [OSTI]

??Results of an extensive study, covering burn intensities in the nW to {dollar}?{dollar}W/cm{dollar}2{dollar} range, of dispersive hole growth kinetics are reported for Oxazine 720 in (more)

Kenney, Michael Joseph

1990-01-01T23:59:59.000Z

199

Ultrasonication technique: a method for dispersing nanoclay in wood adhesives  

Science Journals Connector (OSTI)

The efficiency of ultrasonication technique to disperse nanoclay in polyvinyl acetate (PVA) was examined. A hydrophilic nanoclay was added to PVA, and its effects on bond strength of wood joints were determined. The results of bond strength measured ...

Alireza Kaboorani; Bernard Riedl; Pierre Blanchet

2013-01-01T23:59:59.000Z

200

Dispersion interferometer using modulation amplitudes on LHD (invited)  

SciTech Connect (OSTI)

Since a dispersion interferometer is insensitive to mechanical vibrations, a vibration compensation system is not necessary. The CO{sub 2} laser dispersion interferometer with phase modulations on the Large Helical Device utilizes the new phase extraction method which uses modulation amplitudes and can improve a disadvantage of the original dispersion interferometer: measurement errors caused by variations of detected intensities. The phase variation within 2 10{sup 17} m{sup ?3} is obtained without vibration compensation system. The measured line averaged electron density with the dispersion interferometer shows good agreement with that with the existing far infrared laser interferometer. Fringe jump errors in high density ranging up to 1.5 10{sup 20} m{sup ?3} can be overcome by a sufficient sampling rate of about 100 kHz.

Akiyama, T., E-mail: takiyama@lhd.nifs.ac.jp; Yasuhara, R.; Kawahata, K. [National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu 509-5292 (Japan); Okajima, S.; Nakayama, K. [Chubu University, Matsumoto-cho, Kasugai-shi, Aichi 487-8501 (Japan)

2014-11-15T23:59:59.000Z

Note: This page contains sample records for the topic "ion dispersion thermochronometry" 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

Effects of Oil and Oil Dispersants on the Marine Environment  

Science Journals Connector (OSTI)

13 April 1971 research-article Effects of Oil and Oil Dispersants on the Marine Environment R. G. J. Shelton In the context of marine pollution, the term 'oil' can cover a very wide range of substances and usually...

1971-01-01T23:59:59.000Z

202

Bayesian Network Analysis of Radiological Dispersal Device Acquisitions  

E-Print Network [OSTI]

It remains unlikely that a terrorist organization could produce or procure an actual nuclear weapon. However, the construction of a radiological dispersal device (RDD) from commercially produced radioactive sources and conventional explosives could...

Hundley, Grant Richard

2012-02-14T23:59:59.000Z

203

GIS and plume dispersion modeling for population exposure assessment  

E-Print Network [OSTI]

. Traditional methods of dispersion modeling for the permitting of new sources and the monitoring of existing sources have allowed much room for error in terms of the effect of the pollutants on nearby populations (Hardikar, 1995). The capabilities of GIS...

Archer, Jeffrey Keith

2012-06-07T23:59:59.000Z

204

A dynamic model for the Lagrangian stochastic dispersion coefficient  

SciTech Connect (OSTI)

A stochastic sub-grid model is often used to accurately represent particle dispersion in turbulent flows using large eddy simulations. Models of this type have a free parameter, the dispersion coefficient, which is not universal and is strongly grid-dependent. In the present paper, a dynamic model for the evaluation of the coefficient is proposed and validated in decaying homogeneous isotropic turbulence. The grid dependence of the static coefficient is investigated in a turbulent mixing layer and compared to the dynamic model. The dynamic model accurately predicts dispersion statistics and resolves the grid-dependence. Dispersion statistics of the dynamically calculated constant are more accurate than any static coefficient choice for a number of grid spacings. Furthermore, the dynamic model produces less numerical artefacts than a static model and exhibits smaller sensitivity in the results predicted for different particle relaxation times.

Pesmazoglou, I.; Navarro-Martinez, S., E-mail: s.navarro@imperial.ac.uk [Department of Mechanical Engineering, Imperial College, London SW7 2AZ (United Kingdom); Kempf, A. M. [Chair of Fluid Dynamics, Institute for Combustion and Gasdynamics and Center for Computational Sciences and Simulation, Universitt Duisburg-Essen, Duisburg, 47048 (Germany)] [Chair of Fluid Dynamics, Institute for Combustion and Gasdynamics and Center for Computational Sciences and Simulation, Universitt Duisburg-Essen, Duisburg, 47048 (Germany)

2013-12-15T23:59:59.000Z

205

Study of a liquid metal ion source for external ion injection into electron-beam ion source  

E-Print Network [OSTI]

Study of a liquid metal ion source for external ion injection into electron-beam ion source A into electron-beam ion source EBIS . It does not use a buffer gas and therefore it provides only a very small types of low-charged ion sources have been used for external ion injection into BNL electron-beam ion

206

E-Print Network 3.0 - advective- dispersive formulation Sample...  

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

of the advection dispersion equation. 12;Point like injectionPoint like injection Transport... transport formulations and dispersion ... Source: Politcnica de Catalunya,...

207

E-Print Network 3.0 - anomalous dispersion phase-matching Sample...  

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

to travel at its luminal group velocity but phase-match to dispersive waves... dispersive radiation to be ... Source: Gaeta, Alexander L. - School of Applied and Engineering...

208

E-Print Network 3.0 - atmospheric dispersion study Sample Search...  

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

-WIND DISPERSAL IN FRESHWATER WETLANDS: KNOWLEDGE FOR CONSERVATION AND RESTORATION -271 Applied Vegetation Science 9: 271-278, 2006 Summary: , seed dispersal by water has been...

209

Low Cost Fabrication of Oxide Dispersion Strengthened Materials  

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

Low Cost Fabrication of Oxide Dispersion Low Cost Fabrication of Oxide Dispersion Strengthened Materials Background To obtain significant increases in the efficiency of coal fired power plants, steam pressure and temperature must be increased beyond current technology to advanced ultra-supercritical (A-USC) conditions -temperatures and pressures up to 760 degrees Celsius (°C) and 35 megapascals (MPa). The upper bounds of operating pressure and temperature are limited by the properties of the current set

210

Dispersive processes in models of regional radionuclide migration. Technical memorandum  

SciTech Connect (OSTI)

Three broad areas of concern in the development of aquifer scale transport models will be local scale diffusion and dispersion processes, regional scale dispersion processes, and numerical problems associated with the advection-dispersion equation. Local scale dispersion processes are fairly well understood and accessible to observation. These processes will generally be dominated in large scale systems by regional processes, or macro-dispersion. Macro-dispersion is primarily the result of large scale heterogeneities in aquifer properties. In addition, the effects of many modeling approximations are often included in the process. Because difficulties arise in parameterization of this large scale phenomenon, parameterization should be based on field measurements made at the same scale as the transport process of interest or else partially circumvented through the application of a probabilistic advection model. Other problems associated with numerical transport models include difficulties with conservation of mass, stability, numerical dissipation, overshoot, flexibility, and efficiency. We recommend the random-walk model formulation for Lawrence Livermore Laboratory's purposes as the most flexible, accurate and relatively efficient modeling approach that overcomes these difficulties.

Evenson, D.E.; Dettinger, M.D.

1980-05-01T23:59:59.000Z

211

Radioactive ion detector  

DOE Patents [OSTI]

Apparatus for detecting the presence, in aqueous media, of substances which emit alpha and/or beta radiation and determining the oxidation state of these radioactive substances, that is, whether they are in cationic or anionic form. In one embodiment, a sensor assembly has two elements, one comprised of an ion-exchange material which binds cations and the other comprised of an ion-exchange material which binds anions. Each ion-exchange element is further comprised of a scintillation plastic and a photocurrent generator. When a radioactive substance to which the sensor is exposed binds to either element and emits alpha or beta particles, photons produced in the scintillation plastic illuminate the photocurrent generator of that element. Sensing apparatus senses generator output and thereby indicates whether cationic species or anionic species or both are present and also provides an indication of species quantity. 2 figs.

Bower, K.E.; Weeks, D.R.

1997-08-12T23:59:59.000Z

212

Radioactive ion detector  

DOE Patents [OSTI]

Apparatus for detecting the presence, in aqueous media, of substances which emit alpha and/or beta radiation and determining the oxidation state of these radioactive substances, that is, whether they are in cationic or anionic form. In one embodiment, a sensor assembly has two elements, one comprised of an ion-exchange material which binds cations and the other comprised of an ion-exchange material which binds anions. Each ion-exchange element is further comprised of a scintillation plastic and a photocurrent generator. When a radioactive substance to which the sensor is exposed binds to either element and emits alpha or beta particles, photons produced in the scintillation plastic illuminate the photocurrent generator of that element. Sensing apparatus senses generator output and thereby indicates whether cationic species or anionic species or both are present and also provides an indication of species quantity.

Bower, Kenneth E. (Los Alamos, NM); Weeks, Donald R. (Saratoga, CA)

1997-01-01T23:59:59.000Z

213

Oxygen ion conducting materials  

DOE Patents [OSTI]

An oxygen ion conducting ceramic oxide that has applications in industry including fuel cells, oxygen pumps, oxygen sensors, and separation membranes. The material is based on the idea that substituting a dopant into the host perovskite lattice of (La,Sr)MnO.sub.3 that prefers a coordination number lower than 6 will induce oxygen ion vacancies to form in the lattice. Because the oxygen ion conductivity of (La,Sr)MnO.sub.3 is low over a very large temperature range, the material exhibits a high overpotential when used. The inclusion of oxygen vacancies into the lattice by doping the material has been found to maintain the desirable properties of (La,Sr)MnO.sub.3, while significantly decreasing the experimentally observed overpotential.

Vaughey, John (Elmhurst, IL); Krumpelt, Michael (Naperville, IL); Wang, Xiaoping (Downers Grove, IL); Carter, J. David (Bolingbrook, IL)

2003-01-01T23:59:59.000Z

214

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

215

Hydrogen ion microlithography  

DOE Patents [OSTI]

Disclosed is a hydrogen ion microlithography process for use in microelectronic fabrication and semiconductor device processing. The process comprises the steps of providing a single layer of either an amorphous silicon or hydrogenated amorphous silicon material. A pattern is recorded in a selected layer of amorphous silicon or hydrogenated amorphous silicon materials by preferentially implanting hydrogen ions therein so as to permit the selected layer to serve as a mask-resist wafer suitable for subsequent development and device fabrication. The layer is developed to provide a surface pattern therein adaptable for subsequent use in microelectronic fabrication and semiconductor device processing. 6 figs.

Tsuo, Y.S.; Deb, S.K.

1990-10-02T23:59:59.000Z

216

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

217

Dispersion and waves in bounded plasmas with subwavelength inhomogeneities: Genesis of MEFIB  

SciTech Connect (OSTI)

Bounded plasma exhibit many interesting behavior that are not found in plasmas of 'infinite' extent such as space and astrophysical plasmas. Our studies have revealed that the dispersion properties of waves in a bounded magnetoplasma deviates considerably from the predictions of the Clemmow-Mullaly-Allis (CMA) model, giving rise to new regimes of wave propagation and absorption. The anisotropy of the medium dictated by the length scales of plasma nonuniformity and magnetostatic field inhomogeneity lead to rotation of the polarization axis an effect similar to the Cotton-Mouton effect in a magneto-optic medium but with distinct differences due to wave induced resonances. This article highlights some of these interesting effects observed experimentally and corroborated with Monte Carlo simulations. One of the principal outcomes of this research is the genesis of a novel multielement focused ion beam (MEFIB) system that utilizes compact bounded plasmas in a minimum B field to provide intense focused ion beams of a variety of elements for new research in nanoscience and technology.

Bhattacharjee, Sudeep [Department of Physics, Indian Institute of Technology - Kanpur, Kanpur 208016, UP (United States)

2014-02-11T23:59:59.000Z

218

Parametrically Driven Ion Cyclotron Waves and Intense Ion Heating  

Science Journals Connector (OSTI)

Finite-amplitude plasma waves excited by plates outside a plasma column are shown to decay into other plasma waves and electrostatic ion cyclotron waves, accompanied by ion heating.

T. K. Chu; S. Bernabei; R. W. Motley

1973-07-23T23:59:59.000Z

219

Focused Ion Beam (FIB):  

Science Journals Connector (OSTI)

...al., 1990; Basile et al., 1992; Overwijk et al., 1993). Focused gallium ion...detailed descriptions are given elsewhere (Overwijk et al., 1993; Heaney et al., 2001...Kluwer Academic Publishers, 316 pp. Overwijk, M.H.E., van den Heuvel, F...

Richard WIRTH

220

Pulsed ion beam source  

DOE Patents [OSTI]

An improved pulsed ion beam source is disclosed having a new biasing circuit for the fast magnetic field. This circuit provides for an initial negative bias for the field created by the fast coils in the ion beam source which pre-ionize the gas in the source, ionize the gas and deliver the gas to the proper position in the accelerating gap between the anode and cathode assemblies in the ion beam source. The initial negative bias improves the interaction between the location of the nulls in the composite magnetic field in the ion beam source and the position of the gas for pre-ionization and ionization into the plasma as well as final positioning of the plasma in the accelerating gap. Improvements to the construction of the flux excluders in the anode assembly are also accomplished by fabricating them as layered structures with a high melting point, low conductivity material on the outsides with a high conductivity material in the center. 12 figs.

Greenly, J.B.

1997-08-12T23:59:59.000Z

Note: This page contains sample records for the topic "ion dispersion thermochronometry" 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

Photo ion spectrometer  

DOE Patents [OSTI]

A method and apparatus for extracting for quantitative analysis ions of selected atomic components of a sample. A lens system is configured to provide a slowly diminishing field region for a volume containing the selected atomic components, enabling accurate energy analysis of ions generated in the slowly diminishing field region. The lens system also enables focusing on a sample of a charged particle beam, such as an ion beam, along a path length perpendicular to the sample and extraction of the charged particles along a path length also perpendicular to the sample. Improvement of signal to noise ratio is achieved by laser excitation of ions to selected autoionization states before carrying out quantitative analysis. Accurate energy analysis of energetic charged particles is assured by using a preselected resistive thick film configuration disposed on an insulator substrate for generating predetermined electric field boundary conditions to achieve for analysis the required electric field potential. The spectrometer also is applicable in the fields of SIMS, ISS and electron spectroscopy.

Gruen, Dieter M. (Downers Grove, IL); Young, Charles E. (Westmont, IL); Pellin, Michael J. (Naperville, IL)

1989-01-01T23:59:59.000Z

222

Photo ion spectrometer  

DOE Patents [OSTI]

A method and apparatus are described for extracting for quantitative analysis ions of selected atomic components of a sample. A lens system is configured to provide a slowly diminishing field region for a volume containing the selected atomic components, enabling accurate energy analysis of ions generated in the slowly diminishing field region. The lens system also enables focusing on a sample of a charged particle beam, such as an ion beam, along a path length perpendicular to the sample and extraction of the charged particles along a path length also perpendicular to the sample. Improvement of signal to noise ratio is achieved by laser excitation of ions to selected auto-ionization states before carrying out quantitative analysis. Accurate energy analysis of energetic charged particles is assured by using a preselected resistive thick film configuration disposed on an insulator substrate for generating predetermined electric field boundary conditions to achieve for analysis the required electric field potential. The spectrometer also is applicable in the fields of SIMS, ISS and electron spectroscopy. 8 figs.

Gruen, D.M.; Young, C.E.; Pellin, M.J.

1989-08-08T23:59:59.000Z

223

Lattice Boltzmann method for colloidal dispersions with phase change  

Science Journals Connector (OSTI)

Colloidal dispersions are known to undergo phase transition in a number of processes. This often gives rise to formation of structures in a flowing medium. In this paper, we present a model for flow of a colloidal dispersion with phase change. Two distribution functions are used. The colloid is described as a non-ideal fluid capable of phase change, but rather than taking the dispersion medium as the second fluid, a better choice is the dispersion (water plus colloid) which can be considered as an incompressible fluid. This choice allows a standard Lattice Boltzmann (LB) model for incompressible fluids to be used in combination with for the 'free-energy' LB model for the colloid. The coupling between the two fluids is the drag force on the colloid and the dependence of the viscosity of the overall fluid on the particle volume fraction. The problems raised by characteristic times and lengths have been treated. The main application considered is the growth dynamics or domain structuration of protein dispersions during dead-end filtration on a membrane surface.

B. Piaud; M.J. Clifton; S. Blanco; R. Fournier

2008-01-01T23:59:59.000Z

224

System and method for detection of dispersed broadband signals  

DOE Patents [OSTI]

A system and method for detecting the presence of dispersed broadband signals in real time are disclosed. The present invention utilizes a bank of matched filters for detecting the received dispersed broadband signals. Each matched filter uses a respective robust time template that has been designed to approximate the dispersed broadband signals of interest, and each time template varies across a spectrum of possible dispersed broadband signal time templates. The received dispersed broadband signal x(t) is received by each of the matched filters, and if one or more matches occurs, then the received data is determined to have signal data of interest. This signal data can then be analyzed and/or transmitted to Earth for analysis, as desired. The system and method of the present invention will prove extremely useful in many fields, including satellite communications, plasma physics, and interstellar research. The varying time templates used in the bank of matched filters are determined as follows. The robust time domain template is assumed to take the form w(t)=A(t)cos[l brace]2[phi](t)[r brace]. Since the instantaneous frequency f(t) is known to be equal to the derivative of the phase [phi](t), the trajectory of a joint time-frequency representation of x(t) is used as an approximation of [phi][prime](t). 10 figs.

Qian, S.; Dunham, M.E.

1999-06-08T23:59:59.000Z

225

System and method for detection of dispersed broadband signals  

DOE Patents [OSTI]

A system and method for detecting the presence of dispersed broadband signals in real time. The present invention utilizes a bank of matched filters for detecting the received dispersed broadband signals. Each matched filter uses a respective robust time template that has been designed to approximate the dispersed broadband signals of interest, and each time template varies across a spectrum of possible dispersed broadband signal time templates. The received dispersed broadband signal x(t) is received by each of the matched filters, and if one or more matches occurs, then the received data is determined to have signal data of interest. This signal data can then be analyzed and/or transmitted to Earth for analysis, as desired. The system and method of the present invention will prove extremely useful in many fields, including satellite communications, plasma physics, and interstellar research. The varying time templates used in the bank of matched filters are determined as follows. The robust time domain template is assumed to take the form w(t)=A(t)cos{2.phi.(t)}. Since the instantaneous frequency f(t) is known to be equal to the derivative of the phase .phi.(t), the trajectory of a joint time-frequency representation of x(t) is used as an approximation of .phi.'(t).

Qian, Shie (Austin, TX); Dunham, Mark E. (Los Alamos, NM)

1999-06-08T23:59:59.000Z

226

Method of Manufacturing Micro-Disperse Particles of Sodium Borohydride  

DOE Patents [OSTI]

A compact solid source of hydrogen gas, where the gas is generated by contacting water with micro-disperse particles of sodium borohydride in the presence of a catalyst, such as cobalt or ruthenium. The micro-disperse particles can have a substantially uniform diameter of 1-10 microns, and preferably about 3-5 microns. Ruthenium or cobalt catalytic nanoparticles can be incorporated in the micro-disperse particles of sodium borohydride, which allows a rapid and complete reaction to occur without the problems associated with caking and scaling of the surface by the reactant product sodium metaborate. A closed loop water management system can be used to recycle wastewater from a PEM fuel cell to supply water for reacting with the micro-disperse particles of sodium borohydride in a compact hydrogen gas generator. Capillary forces can wick water from a water reservoir into a packed bed of micro-disperse fuel particles, eliminating the need for using an active pump.

Kravitz, Stanley H. (Placitas, NM); Hecht, Andrew M. (Sandia Park, NM); Sylwester. Alan P. (Albuquerque, NM); Bell, Nelson S. (Albuquerque, NM)

2008-09-23T23:59:59.000Z

227

Dispersivity Testing of Zero-Valent Iron Treatment Cells: Monticello, Utah, November 2005 Through February 2008  

Broader source: Energy.gov [DOE]

Dispersivity Testing of Zero-Valent Iron Treatment Cells: Monticello, Utah, November 2005 Through February 2008

228

Ecological Modelling 147 (2002) 2339 Dispersal success on spatially structured landscapes: when  

E-Print Network [OSTI]

Ecological Modelling 147 (2002) 23­39 Dispersal success on spatially structured landscapes: when do a simulation study in which we explored (1) the conditions under which landscape structure affects dispersal success and (2) the dependency of dispersal success on the choice of dispersal algorithm. We simulated

With, Kimberly A.

229

Inertial confinement fusion based on the ion-bubble trigger  

SciTech Connect (OSTI)

Triggering the ion-bubble in an inertial confinement fusion, we have developed a novel scheme for the fast ignition. This scheme relies on the plasma cavitation by the wake of an intense laser pulse to generate an ion-bubble. The bubble acts both as an intense electron accelerator and as an electron wiggler. Consequently, the accelerated electrons trapped in the bubble can emit an intense tunable laser light. This light can be absorbed by an ablation layer on the outside surface of the ignition capsule, which subsequently drills it and thereby produces a guide channel in the pellet. Finally, the relativistic electron beam created in the bubble is guided through the channel to the high density core igniting the fusion fuel. The normalized beam intensity and beam energy required for triggering the ignition have been calculated when core is heated by the e-beam. In addition, through solving the momentum transfer, continuity and wave equations, a dispersion relation for the electromagnetic and space-charge waves has been analytically derived. The variations of growth rate with the ion-bubble density and electron beam energy have been illustrated. It is found that the growth rates of instability are significantly controlled by the ions concentration and the e-beam energy in the bubble.

Jafari, S., E-mail: SJafari@guilan.ac.ir; Nilkar, M.; Ghasemizad, A. [Department of Physics, University of Guilan, Rasht 41335-1914 (Iran, Islamic Republic of); Mehdian, H. [Department of Physics and Institute for Plasma Research, Tarbiat Moallem University, Tehran 15614 (Iran, Islamic Republic of)

2014-10-15T23:59:59.000Z

230

Cryogenic Ion Chemistry and Spectroscopy  

Science Journals Connector (OSTI)

Cryogenic Ion Chemistry and Spectroscopy ... His research focuses on developing and applying cryogenic ion processing for the characterization of hydrogen bonding motifs in macromolecules and activated organometallic catalysts. ... In this Account, we discuss how cryogenic cooling, mass selection, and reactive processing together provide a powerful way to characterize ion structures as well as rationally synthesize labile reaction intermediates. ...

Arron B. Wolk; Christopher M. Leavitt; Etienne Garand; Mark A. Johnson

2013-08-23T23:59:59.000Z

231

Landau damping effects on dust-acoustic solitary waves in a dusty negative-ion plasma  

SciTech Connect (OSTI)

The nonlinear theory of dust-acoustic waves (DAWs) with Landau damping is studied in an unmagnetized dusty negative-ion plasma in the extreme conditions when the free electrons are absent. The cold massive charged dusts are described by fluid equations, whereas the two-species of ions (positive and negative) are described by the kinetic Vlasov equations. A Korteweg-de Vries (KdV) equation with Landau damping, governing the dynamics of weakly nonlinear and weakly dispersive DAWs, is derived following Ott and Sudan [Phys. Fluids 12, 2388 (1969)]. It is shown that for some typical laboratory and space plasmas, the Landau damping (and the nonlinear) effects are more pronounced than the finite Debye length (dispersive) effects for which the KdV soliton theory is not applicable to DAWs in dusty pair-ion plasmas. The properties of the linear phase velocity, solitary wave amplitudes (in presence and absence of the Landau damping) as well as the Landau damping rate are studied with the effects of the positive ion to dust density ratio (?{sub pd}) as well as the ratios of positive to negative ion temperatures (?) and masses (m)

Barman, Arnab; Misra, A. P., E-mail: apmisra@visva-bharati.ac.in, E-mail: apmisra@gmail.com [Department of Mathematics, Siksha Bhavana, Visva-Bharati University, Santiniketan 731 235, West Bengal (India)

2014-07-15T23:59:59.000Z

232

Roughening instability and evolution of the Ge(001) surface during ion sputtering  

Science Journals Connector (OSTI)

We have investigated the temperature-dependent roughening kinetics of Ge surfaces during low energy ion sputtering using energy dispersive x-ray reflectivity. At 150 C and below, the surface is amorphized by ion impact and roughens to a steady state small value. At 250 C the surface remains crystalline, roughens exponentially with time, and develops a pronounced ripple topography. At higher temperature this exponential roughening is slower, with an initial sublinear time dependence. A model that contains a balance between smoothing by surface diffusion and viscous flow and roughening by atom removal explains the kinetics. Ripple formation is a result of a curvature-dependent sputter yield.

E. Chason; T. M. Mayer; B. K. Kellerman; D. T. McIlroy; A. J. Howard

1994-05-09T23:59:59.000Z

233

PPPL-3136 -Preprint Date: August 1995 Majority Ion Heating Near the Ion-ion Hybrid Layer in  

E-Print Network [OSTI]

magnetosonic waves in the ion cyclotron range of frequencies (ICRF) is discussed. Majority ion heating results1 PPPL-3136 - Preprint Date: August 1995 Majority Ion Heating Near the Ion-ion Hybrid Layer direct majority ion heating in a deuterium-tritium (D-T) reactor-grade plasma via absorption of fast

234

Lack of dispersion cancellation with classical phase-sensitive light  

SciTech Connect (OSTI)

Shapiro recently argued that nonlocal dispersion cancellation using entangled pairs of photons is essentially classical in nature, based on a comparison with a classical model in which two stationary, chaotic beams of light have phases and frequencies that are anticorrelated, which he refers to as 'phase-sensitive' light [J. H. Shapiro, Phys. Rev. A 81, 023824 (2010)]. It is shown here that there is no physical cancellation of dispersion for classical light of that kind and Shapiro's results merely reflect the fact that identical dispersion occurs in both beams. The origin of the cross correlations between the intensities of the two beams is shown to be completely different in the classical and quantum mechanical cases.

Franson, J. D. [Physics Department, University of Maryland, Baltimore County, Baltimore, Maryland 21250 (United States)

2010-02-15T23:59:59.000Z

235

Theory of angular dispersive imaging hard x-ray spectrographs  

E-Print Network [OSTI]

A spectrograph is an optical instrument that disperses photons of different energies into distinct directions and space locations, and images photon spectra on a position-sensitive detector. Spectrographs consist of collimating, angular dispersive, and focusing optical elements. Bragg reflecting crystals arranged in an asymmetric scattering geometry are used as the dispersing elements. A ray-transfer matrix technique is applied to propagate x-rays through the optical elements. Several optical designs of hard x-ray spectrographs are proposed and their performance is analyzed. Spectrographs with an energy resolution of 0.1 meV and a spectral window of imaging up to a few tens of meVs are shown to be feasible for inelastic x-ray scattering (IXS) spectroscopy applications. In another example, a spectrograph with a 1-meV spectral resolution and 85-meV spectral window of imaging is considered for Cu K-edge resonant IXS (RIXS).

Shvyd'ko, Yuri

2015-01-01T23:59:59.000Z

236

Black/White hole radiation from dispersive theories  

E-Print Network [OSTI]

We study the fluxes emitted by black holes when using dispersive field theories. We work with stationary one dimensional backgrounds which are asymptotically flat on both sides of the horizon. The asymptotic fluxes are governed by a 3x3 Bogoliubov transformation. The fluxes emitted by the corresponding white holes are regular and governed by the inverse transformation. We numerically compute the spectral properties of these fluxes for both sub- and superluminal quartic dispersion. The leading deviations with respect to the dispersionless flux are computed and shown to be governed by a critical frequency above which there is no radiation. Unlike the UV scale governing dispersion, its value critically depends on the asymptotic properties of the background. We also study the flux outside the robust regime. In particular we show that its low frequency part remains almost thermal but with a temperature which significantly differs from the standard one. Application to four dimensional black holes and Bose-Einstein condensates are in preparation.

Jean Macher; Renaud Parentani

2009-06-02T23:59:59.000Z

237

New ceramics containing dispersants for improved fracture toughness  

DOE Patents [OSTI]

The invention is a ceramic composition containing a new class of dispersant for hindering crack propagation by means of one or more energy-dissipative mechanisms. The composition is composed of a ceramic matrix with dispersed particles of a transformation-prone rare-earth niobate, tantalate or mixtures of these with each other and/or with a rare-earth vanadate. The dispersants, having a generic composition tRBO/sub 4/, where R is a rare-earth element, B if Nb or Ta and O is oxygen, are mixed in powder form with a powder of the matrix ceramic and sintered to produce a ceramic form or body. The crack-hindering mechanisms operates to provide improved performance over a wide range of temperature and operating conditions.

Nevitt, M.V.; Aldred, A.T.; Chan, Sai-Kit

1985-07-01T23:59:59.000Z

238

Polydispersity analysis of Taylor dispersion data: the cumulant method  

E-Print Network [OSTI]

Taylor dispersion analysis is an increasingly popular characterization method that measures the diffusion coefficient, and hence the hydrodynamic radius, of (bio)polymers, nanoparticles or even small molecules. In this work, we describe an extension to current data analysis schemes that allows size polydispersity to be quantified for an arbitrary sample, thereby significantly enhancing the potentiality of Taylor dispersion analysis. The method is based on a cumulant development similar to that used for the analysis of dynamic light scattering data. Specific challenges posed by the cumulant analysis of Taylor dispersion data are discussed, and practical ways to address them are proposed. We successfully test this new method by analyzing both simulated and experimental data for solutions of moderately polydisperse polymers and polymer mixtures.

Luca Cipelletti; Jean-Philippe Biron; Michel Martin; Herv Cottet

2014-08-26T23:59:59.000Z

239

Comparison of Average Transport and Dispersion Among a Gaussian, a  

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

Comparison of Average Transport and Dispersion Among a Gaussian, a Comparison of Average Transport and Dispersion Among a Gaussian, a Two-Dimensional, and a Three-Dimensional Model Comparison of Average Transport and Dispersion Among a Gaussian, a Two-Dimensional, and a Three-Dimensional Model The Nuclear Regulatory Commission's (NRC's) code for predicting off-site consequences, MACCS2 (Chanin, et al. 1998) (MELCOR Accident Consequence Code System, Version 2), uses a simplified model for atmospheric transport and d ispersion (ATD), that is, a straight-line Gaussian model. The MACCS2 calculations are used by the NRC for planning purposes, for cost-benefit analyses, and in level-3 probabilistic risk analyses (PRAs). The MACCS2 ATD model has been criticized as being overly simplistic, even for its purposes. The justification for its use has been

240

Perspective on the Role of Negative Ions and Ion-Ion Plasmas in Heavy Ion Fusion Science, Magnetic Fusion Energy, and Related Fields  

E-Print Network [OSTI]

in Heavy Ion Fusion Science, Magnetic Fusion Energy, andin Heavy Ion Fusion Science, Magnetic Fusion Energy, and

Kwan, J.W.

2008-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ion dispersion thermochronometry" 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

Relativistic Heavy Ion Collider  

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

Relativistic Heavy Ion Collider Relativistic Heavy Ion Collider managed for the U.S. Department of Energy by Brookhaven Science Associates, founded by Stony Brook University and Battelle. managed for the U.S. Department of Energy by Brookhaven Science Associates, a company founded by Stony Brook University and Battelle 07/07 Brookhaven National Laboratory Funded by the U.S. Department of Energy, Brookhaven National Laboratory is a multipurpose research institution located on a 5,300-acre site on Long Island, New York. Six Nobel Prize-winning discoveries have been made at Brookhaven Lab. The Laboratory operates large-scale scientific facilities and performs research in physics, chemistry, biology, medicine, applied science, and

242

Characterizing Heavy Ion  

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

Heavy Ion Heavy Ion Reactions in the 1980's Is there Treasure at the end of the Rainbow? & What happens and how do different modes compete? John Schiffer One of the three research areas for ATLAS, as stated in a 1984 document to Congress: Are there some new marvelous symmetries, hidden in resonances in heavier nuclei, beyond 12 C+ 12 C and its immediate vicinity? (s.c. linac work, pre-ATLAS) Other attempts to chase the rainbow 180 o elastic scattering of 12 C on 40 Ca shows structure Fusion of 16 O on 40 Ca does not. In the end, it seemed that these structures were sometimes present in alpha-particle nuclei, but almost never in others. Some optimists, continued the pursuit. We also looked at the total fusion cross section in systems that showed resonances in scattering.

243

InstructIons  

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

InstructIons InstructIons for AccessIng fedconnect PostIngs The registration process requires multiple steps prior to submission, so please plan in advance as late applications will not be accepted. Note that for some applications, a Letter of Intent must be filed prior to the final deadline. To access the complete postings, follow the below steps: 1. Go to https://www.FedConnect.net/ 2. Click on "Search Public Opportunities" 3. Select "Reference Number" in the Search Criteria drop down box and then enter the Reference Number of the funding opportunity you are interested in (DE-FOA-XXXXXXX), followed by clicking the "Search" button 4. Click on the appropriate link after search results are displayed

244

Extended, Continuous Pt Nanostructures in Thick, Dispersed Electrodes  

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

Bryan Pivovar (PI) Bryan Pivovar (PI) National Renewable Energy Laboratory Sept 30, 2009 Extended, Continuous Pt Nanostructures in Thick, Dispersed Electrodes This presentation does not contain any proprietary, confidential, or otherwise restricted information Objectives To assist the DOE Fuel Cell Technologies (FCT) Program in meeting cost, durability, and performance targets in the areas of Electrocatalysts and MEAs. Approach: Novel Synthesis and Electrode Studies Pt nanotubes (UC-R) Pt coated carbon nanotubes Synthesis of novel catalysts based on extended surfaces due to 3M's demonstrated improvements in specific activity and durability using similar systems. Electrode architecture design, based on novel catalyst structures that allow thick (~10 µm), dispersed electrodes to

245

AIR DISPERSION MODELING AT THE WASTE ISOLATION PILOT PLANT  

SciTech Connect (OSTI)

One concern at the Waste Isolation Pilot Plant (WIPP) is the amount of alpha-emitting radionuclides or hazardous chemicals that can become airborne at the facility and reach the Exclusive Use Area boundary as the result of a release from the Waste Handling Building (WHB) or from the underground during waste emplacement operations. The WIPP Safety Analysis Report (SAR), WIPP RCRA Permit, and WIPP Emergency Preparedness Hazards Assessments include air dispersion calculations to address this issue. Meteorological conditions at the WIPP facility will dictate direction, speed, and dilution of a contaminant plume of respirable material due to chronic releases or during an accident. Due to the paucity of meteorological information at the WIPP site prior to September 1996, the Department of Energy (DOE) reports had to rely largely on unqualified climatic data from the site and neighboring Carlsbad, which is situated approximately 40 km (26 miles) to the west of the site. This report examines the validity of the DOE air dispersion calculations using new meteorological data measured and collected at the WIPP site since September 1996. The air dispersion calculations in this report include both chronic and acute releases. Chronic release calculations were conducted with the EPA-approved code, CAP88PC and the calculations showed that in order for a violation of 40 CFR61 (NESHAPS) to occur, approximately 15 mCi/yr of 239Pu would have to be released from the exhaust stack or from the WHB. This is an extremely high value. Hence, it is unlikely that NESHAPS would be violated. A site-specific air dispersion coefficient was evaluated for comparison with that used in acute dose calculations. The calculations presented in Section 3.2 and 3.3 show that one could expect a slightly less dispersive plume (larger air dispersion coefficient) given greater confidence in the meteorological data, i.e. 95% worst case meteorological conditions. Calculations show that dispersion will decrease slightly if a more stable wind class is assumed, where very little vertical mixing occurs. It is recommended that previous reports which used fixed values for calculating the air dispersion coefficient be updated to reflect the new meteorological data, such as the WIPP Safety Analysis Report and the WIPP Emergency Preparedness Hazards Assessment. It is also recommended that uncertainty be incorporated into the calculations so that a more meaningful assessment of risk during accidents can be achieved.

Rucker, D.F.

2000-08-01T23:59:59.000Z

246

Alcohol Dispersions of Calcium Hydroxide Nanoparticles for Stone Conservation  

Science Journals Connector (OSTI)

Alcohol dispersions of Ca(OH)2 nanoparticles, the so-called nanolimes, are emerging as an effective conservation material for the consolidation of stone, mortars, and plasters present in old masonry and/or mural paintings. ... Considering that past studies on the consolidation of stone using nanolime dispersions have focused on carbonate stones such as limestones, here we test the ability of these treatments to consolidate silicate stones. ... DArmada, P.; Hirst, E.Nano-lime for consolidation of plaster and stone J. Architect. ...

Carlos Rodriguez-Navarro; Amelia Suzuki; Encarnacion Ruiz-Agudo

2013-08-06T23:59:59.000Z

247

Scattering approach to dispersive atom-surface interactions  

SciTech Connect (OSTI)

We develop the scattering approach for the dispersive force on a ground state atom on top of a corrugated surface. We present explicit results to first order in the corrugation amplitude. A variety of analytical results are derived in different limiting cases, including the van der Waals and Casimir-Polder regimes. We compute numerically the exact first-order dispersive potential for arbitrary separation distances and corrugation wavelengths, for a Rubidium atom on top of a silicon or gold corrugated surface. We consider in detail the correction to the proximity force approximation, and present a very simple approximation algorithm for computing the potential.

Dalvit, Diego [Los Alamos National Laboratory; Messina, Riccardo [LAB KASTLER BROSSEL; Maia Neto, Paulo [INSTITUTO DE FISICA UFRJ; Lambrecht, Astrid [LAB KASTLER BROSSEL; Reynaud, Serge [LAB KASTLER BROSSEL

2009-01-01T23:59:59.000Z

248

Geometric Doppler Effect: Spin-Split Dispersion of Thermal Radiation  

Science Journals Connector (OSTI)

A geometric Doppler effect manifested by a spin-split dispersion relation of thermal radiation is observed. A spin-dependent dispersion splitting was obtained in a structure consisting of a coupled thermal antenna array. The effect is due to a spin-orbit interaction resulting from the dynamics of the surface waves propagating along the structure whose local anisotropy axis is rotated in space. The observation of the spin-symmetry breaking in thermal radiation may be utilized for manipulation of spontaneous or stimulated emission.

Nir Dahan; Yuri Gorodetski; Kobi Frischwasser; Vladimir Kleiner; Erez Hasman

2010-09-21T23:59:59.000Z

249

The dispersion relation of pion in nuclear matter  

E-Print Network [OSTI]

We put forward a formalism to calculate the relativistic particle - hole and delta - hole excitation polarization insertion for pion propagator by using the particle - hole - antiparticle representation of nucleon and delta propagators in nuclear matter. The real and the imaginary part of the polarization insertion and the dispersion relation for pion propagator are calculated numerically. We find that the short range correlation enhances the delta - hole excitation but suppresses the particle - hole excitation, it also suppresses the pion condensation. We find that the effect of the short range correlation on the pion dispersion relation depends very much on the form of the short range correlation and the parameters involved.

Liang-gang Liu; Masahiro Nakano

1997-09-09T23:59:59.000Z

250

Ion-beam superpinch  

Science Journals Connector (OSTI)

Intense nonrelativistic light-ion beams generated in magnetically insulated diodes can reach total beam currents large enough to confine charged fusion products within pinch channels which are formed by these beams if they are projected onto thermonuclear material. Furthermore, since the required beam currents are still below the critical Alfvn current, these pinch channels are magnetohydrodynamically stable. However, because the time these beams last is very short and of the order of 10 nsec, the thermonuclear target must have a density at least as large as solid-state density to satisfy the Lawson criterion. This large target density makes it necessary that the beam be focused down to a radius less than ? 10-2 cm, to balance the plasma pressure against the magnetic pressure. To make this focusing possible a new kind of a low-emittance intense ion source is proposed. It consists of pointlike pulsed dense plasma positioned in the field-free space behind a meshlike anode. The focusing itself can be done in three steps, first by sufficiently good ion optics, second by wall focusing, and third by radiation cooling. This inertial-confinement fusion concept avoids the problems of reaching this goal through highdensity target compression by ablative implosion.

F. Winterberg

1981-10-01T23:59:59.000Z

251

Negative ion source  

DOE Patents [OSTI]

A method and apparatus for providing a negative ion source accelerates electrons away from a hot filament electron emitter into a region of crossed electric and magnetic fields arranged in a magnetron configuration. During a portion of the resulting cycloidal path, the electron velocity is reduced below its initial value. The electron accelerates as it leaves the surface at a rate of only slightly less than if there were no magnetic field, thereby preventing a charge buildup at the surface of the emitter. As the electron traverses the cycloid, it is decelerated during the second, third, and fourth quadrants, then reeccelerated as it approaches the end of the fourth quadrant to regain its original velocity. The minimum velocity occurs during the fourth quadrant, and corresponds to an electron temperature of 200.degree. to 500.degree. for the electric and magnetic fields commonly encountered in the ion sources of magnetic sector mass spectrometers. An ion source using the above-described thermalized electrons is also disclosed.

Delmore, James E. (Idaho Falls, ID)

1987-01-01T23:59:59.000Z

252

LANL: Ion Beam Materials Laboratory  

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

Ion Beam Materials Laboratory (IBML) is a Los Ion Beam Materials Laboratory (IBML) is a Los Alamos National Laboratory resource devoted to materi- als research through the use of ion beams. Current major research areas include surface characterization through ion beam analysis techniques, surface modification and materials synthesis through ion implantation technology, and radiation damage stud- ies in gases, liquids, and solids. The laboratory's core is a 3.2 MV tandem ion accelerator and a 200 kV ion implanter together with several beam lines. Attached to each beam line is a series of experimental stations that support various research programs. The operation of IBML and its interactions with users are organized around core facilities and experimental stations. The IBML provides and operates the core facilities as well as supports

253

Resonance Ionization Laser Ion Sources  

E-Print Network [OSTI]

The application of the technique of laser resonance ionization to the production of singly charged ions at radioactive ion beam facilities is discussed. The ability to combine high efficiency and element selectivity makes a resonance ionization laser ion source (RILIS) an important component of many radioactive ion beam facilities. At CERN, for example, the RILIS is the most commonly used ion source of the ISOLDE facility, with a yearly operating time of up to 3000 hours. For some isotopes the RILIS can also be used as a fast and sensitive laser spectroscopy tool, provided that the spectral resolution is sufficiently high to reveal the influence of nuclear structure on the atomic spectra. This enables the study of nuclear properties of isotopes with production rates even lower than one ion per second and, in some cases, enables isomer selective ionization. The solutions available for the implementation of resonance laser ionization at radioactive ion beam facilities are summarized. Aspects such as the laser r...

Marsh, B

2013-01-01T23:59:59.000Z

254

Effects of sintering additives on dispersion properties of Al2O3 slurry containing polyacrylic acid dispersant  

Science Journals Connector (OSTI)

The effects of sintering aid adsorption on the dispersion properties of aluminum oxide slurries were investigated. We considered Al2O3 slurry without additives and Al2O3 slurry with a Mg additive with 0.1mass% in oxide equivalent as a sintering aid. In this study, we evaluated the adsorption isotherm of polyacrylic acid (PAA) onto Al2O3 and the dispersion degree of Al2O3 slurries in sedimentation tests under gravity. The adsorption isotherm featured a characteristic adsorption isothermal line with a maximum value when Mg additive was present in Al2O3. In addition, the packing fractions did not correspond to the apparent viscosity. However, in slurry that was allowed to settle for several days, both of them agreed.Therefore, the disagreement between the packing fraction and the apparent viscosity immediately after preparation arose from changes of the dispersion state, such as the decrease of the distance between particles with time.

Hiromi Ohtsuka; Hidetoshi Mizutani; Satoshi IIO; Kazuki Asai; Takayoshi Kiguchi; Hiroshi Satone; Takamasa Mori; Junichiro Tsubaki

2011-01-01T23:59:59.000Z

255

Molecular Ion Beam Transportation for Low Energy Ion Implantation  

SciTech Connect (OSTI)

A joint research and development of steady state intense boron ion sources for 100's of electron-volt ion implanters has been in progress for the past five years. Current density limitation associated with extracting and transporting low energy ion beams result in lower beam currents that in turn adversely affects the process throughput. The transport channel with electrostatic lenses for decaborane (B{sub 10}H{sub 14}) and carborane (C{sub 2}B{sub 10}H{sub 12}) ion beams transportation was developed and investigated. The significant increase of ion beam intensity at the beam transport channel output is demonstrated. The transport channel simulation, construction and experimental results of ion beam transportation are presented.

Kulevoy, T. V.; Kropachev, G. N.; Seleznev, D. N.; Yakushin, P. E.; Kuibeda, R. P.; Kozlov, A. V.; Koshelev, V. A. [Institute for Theoretical and Experimental Physics, Moscow, 117218 (Russian Federation); Hershcovitch, A.; Johnson, B. M. [Brookhaven National Laboratory, Upton, New York 11973 (United States); Gushenets, V. I.; Oks, E. M. [High Current Electronics Institute Russian Academy of Sciences, Tomsk, 634055 (Russian Federation); Polozov, S. M. [Moscow Engineering Physics Institute, Kashirskoe sh. 31, Moscow, 115409 (Russian Federation); Poole, H. J. [PVI, Oxnard, California 93031-5023 (United States)

2011-01-07T23:59:59.000Z

256

Identification of parameters in building concentration dispersion model  

E-Print Network [OSTI]

1 Identification of parameters in building concentration dispersion model D. Calogine*,1 , H. Boyer, 17, 11, 20] use macroscopic models, which represent room or entire building by a single node Abstract The aim of this work is to simulate the pollutants transport in buildings. Focusing mainly

Paris-Sud XI, Université de

257

Metallophilic interactions from dispersion-corrected density-functional theory  

SciTech Connect (OSTI)

In this article, we present the first comprehensive study of metallophilic (aurophilic) interactions using dispersion-corrected density-functional theory. Dispersion interactions (an essential component of metallophilicity) are treated using the exchange-hole dipole moment (XDM) model. By comparing against coupled-cluster benchmark calculations on simple dimers, we show that LC-?PBE-XDM is a viable functional to study interactions between closed-shell transition metals and that it performs uniformly better than second-order Mller-Plesset theory, the basic computational technique used in previous works. We apply LC-?PBE-XDM to address several open questions regarding metallophilicity, such as the interplay between dispersion and relativistic effects, the interaction strength along group 11, the additivity of homo- and hetero-metallophilic effects, the stability of [E(AuPH{sub 3}){sub 4}]{sup +} cations (E = N, P, As, Sb), and the role of metallophilic effects in crystal packing. We find that relativistic effects explain the prevalence of aurophilicity not by stabilizing metal-metal contacts, but by preventing gold from forming ionic structures involving bridge anions (which are otherwise common for Ag and Cu) as a result of the increased electron affinity of the metal. Dispersion effects are less important than previously assumed and their stabilization contribution is relatively independent of the metal.

Otero-de-la-Roza, Alberto, E-mail: aoterodelaroza@ucmerced.edu; Mallory, Joel D.; Johnson, Erin R., E-mail: ejohnson29@ucmerced.edu [Chemistry and Chemical Biology, School of Natural Sciences, University of California, Merced, 5200 North Lake Road, Merced, California 95343 (United States)

2014-05-14T23:59:59.000Z

258

Dispersion diagrams of chromospheric MHD waves in a 2D  

E-Print Network [OSTI]

Dispersion diagrams of chromospheric MHD waves in a 2D simulation Chris Dove The Evergreen State MHD code models dynamics · Methods to get clearer pictures · Analysis of results · Patterns/NCAR, Thursday 29 July 2004 A diagram of the Sun, courtesy NASA sohowww

Zita, E.J.

259

A new microturbine-based dispersed generation scheme  

Science Journals Connector (OSTI)

Almost all of the commercial microturbine-based dispersed generation systems today are composed of a high-speed permanent-magnet alternator and a diode rectifier-PWM inverter pair. A dispersed generation scheme ?? made up of a microturbine, an induction generator, and a diode rectifier-PWM inverter pair ?? is introduced in this paper. A complete model for the self-excited squirrel-cage induction generator is developed and used to study the steady-state and transient behaviours of the overall system. The power delivered to the grid is controlled by an injected current control loop. The input/output power balance is maintained by regulating the DC-bus voltage using a new method based on the torque control of microturbine. Analysis shows that the Simulink simulation results of induction generator is a viable substitute for permanent magnet alternator in microturbine-based dispersed generation systems due to its low cost, low maintenance, rugged structure, and slack between rotor speed and terminal frequency, which isolates the transients of the grid from the generator system when the DC-bus capacitor size is reduced. Both schemes have been simulated and the simulation results are presented to compare the proposed scheme based on induction generator with the present microturbine-based dispersed generation scheme based on synchronous machine.

Afshin Majd; Mehrdad Kazerani

2007-01-01T23:59:59.000Z

260

A Tracer Investigation oftheAtmosph^c Dispersion  

E-Print Network [OSTI]

Laboratory Erik Lyck Air Pollution Laboratory National Agency of Environmental Protection Abstract. Mining at Kvanefjeld, Greenland, will result in releases of air polluting gases. In order to measure the dilution and a sea-breeze. INIS-descriptors: AIR POLLUTION; DILUTION; DISPERSION; ENVIRONMENTAL IMPACTS; GASES

Note: This page contains sample records for the topic "ion dispersion thermochronometry" from the National Library of EnergyBeta (NLEBeta).
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they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Sol State Behavior and Gelation Kinetics in Mixed Nanoclay Dispersions  

Science Journals Connector (OSTI)

This chapter investigates sol and gel state behavior, in aqueous salt free dispersions, of clays Laponite (L) and Na Montmorillonite (MMT) at various mixing ratios (L:MMT=r=1:0.5, 1:1 and 1:2). Percolation...

Ravi Kumar Pujala

2014-01-01T23:59:59.000Z

262

Fuel dispersal modeling for aircraft-runway impact scenarios  

SciTech Connect (OSTI)

A fuel dispersal model for C-141 transport accidents was developed for the Defense Nuclear Agency`s Fuel Fire Technology Base Program to support Weapon System Safety Assessments. The spectrum of accidents resulting from aircraft impact on a runway was divided into three fuel dispersal regimes: low, intermediate, and high-velocity impact. Sufficient data existed in the accident, crash test, and fuel-filled bomb literature to support development of a qualitative framework for dispersal models, but not quantitative models for all regimes. Therefore, a test series at intermediate scale was conducted to generate data on which to base the model for the high-velocity regime. Tests were conducted over an impact velocity range from 12 m/s to 91 m/s and angles of impact from 22.5{degrees} to 67.5{degrees}. Dependent variables were area covered by dispersed fuel, amount of mass in that area, and location of the area relative to the impact line. Test results showed that no liquid pooling occurred for impact velocities greater than 61 m/s, independent of the angle of impact. Some pooling did occur at lower velocities, but in no test was the liquid-layer thickness greater than 5.25 mm.

Tieszen, S.R.

1995-11-01T23:59:59.000Z

263

Single atom identification by energy dispersive x-ray spectroscopy  

SciTech Connect (OSTI)

Using aberration-corrected scanning transmission electron microscope and energy dispersive x-ray spectroscopy, single, isolated impurity atoms of silicon and platinum in monolayer and multilayer graphene are identified. Simultaneously acquired electron energy loss spectra confirm the elemental identification. Contamination difficulties are overcome by employing near-UHV sample conditions. Signal intensities agree within a factor of two with standardless estimates.

Lovejoy, T. C.; Dellby, N.; Krivanek, O. L. [Nion, 1102 8th St., Kirkland, Washington 98033 (United States); Ramasse, Q. M. [SuperSTEM Laboratory, STFC Daresbury, Keckwick Lane, Daresbury WA4 4AD (United Kingdom); Falke, M.; Kaeppel, A.; Terborg, R. [Bruker Nano GmbH, Schwarzschildstr. 12, 12489 Berlin (Germany); Zan, R. [School of Physics and Astronomy, University of Manchester, Manchester M13 9PL (United Kingdom)

2012-04-09T23:59:59.000Z

264

FINITE VOLUME METHODS FOR UNIDIRECTIONAL DISPERSIVE WAVE MODELS  

E-Print Network [OSTI]

], the BBM equation [4] and Boussinesq systems [11, 40, 8]. All these models assume the wave to be weakly to dispersive unidi- rectional water wave propagation in one space dimension. In particular we consider a KdV-BBM differential equation modeling unidirectional wave propagation. Specifically, we consider the KdV-BBM equation

Paris-Sud XI, Université de

265

ccsd00000617 Phonon dispersion in the 1-layer cuprate  

E-Print Network [OSTI]

neutron scattering. PACS numbers: 74.72.Jt, 74.25.Kc, 78.70.Ck x Present address: Physique des Milieux-ray scattering (IXS). The experimental phonon dispersion and the dynamical structure factor are compared for volumes smaller then 0.1 mm 3 (see Bertinotti et al 1997). Such a size is insu?cient for inelastic neutron

266

POLLEN DISPERSAL AND DEPOSITION ON THE QUELCCAYA ICE CAp, PERU  

E-Print Network [OSTI]

POLLEN DISPERSAL AND DEPOSITION ON THE QUELCCAYA ICE CAp, PERU Carl A. Reese and Kam-biu Liu: The relatively young science of tropical ice-core palynology has proven effective in the study of paleoenvironments by its ability to produce long-term and high- resolution paleoclimatic data. However, no studies

Liu, Kam-biu

267

Electrical properties of dispersions of graphene in mineral oil  

SciTech Connect (OSTI)

Dispersions of graphene in mineral oil have been prepared and electrical conductivity and permittivity have been measured. The direct current (DC) conductivity of the dispersions depends on the surface characteristics of the graphene platelets and followed a percolation model with a percolation threshold ranging from 0.05 to 0.1?wt. %. The difference in DC conductivities can be attributed to different states of aggregation of the graphene platelets and to the inter-particle electron transfer, which is affected by the surface radicals. The frequency-dependent conductivity (?(?)) and permittivity (?(?)) were also measured. The conductivity of dispersions with particle contents much greater than the percolation threshold remains constant and equal to the DC conductivity at low frequencies ? with and followed a power-law ?(?)???{sup s} dependence at very high frequencies with s?0.9. For dispersions with graphene concentration near the percolation threshold, a third regime was displayed at intermediate frequencies indicative of interfacial polarization consistent with Maxwell-Wagner effect typically observed in mixtures of two (or more) phases with very distinct electrical and dielectric properties.

Monteiro, O. R., E-mail: othon.monteiro@bakerhughes.com [Baker Hughes, 14990 Yorktown Plaza Dr., Houston, Texas 77040 (United States)

2014-02-03T23:59:59.000Z

268

Deformed dispersion relations and the degree of coherence function  

E-Print Network [OSTI]

The analysis of the modifications that the presence of a deformed dispersion relation entails in the roots of the so--called degree of coherence function, for a beam embodying two different frequencies and moving in a Michelson interferometer, is carried out. The conditions to be satisfied, in order to detect this kind of quantum gravity effect, are also obtained.

A. Camacho; A. Macias

2006-08-16T23:59:59.000Z

269

A Field Experiment to Validate Atmospheric Dispersion and  

E-Print Network [OSTI]

Rise-R.495 A Field Experiment to Validate Atmospheric Dispersion and Dose Models S. P. Nielsen* S Roskilde, Denmark May 1986 #12;RIS?-R-495 DOUBLE TRACER EXPERIMENTS TO EVALUATE ATMOSPHERIC TRANSPORT Pollution Laboratory, Risø National Laboratory, DK-4000 Roskilde, Denmark Abstract. Two tracers

270

Enhanced life ion source for germanium and carbon ion implantation  

SciTech Connect (OSTI)

Germanium and carbon ions represent a significant portion of total ion implantation steps in the process flow. Very often ion source materials that used to produce ions are chemically aggressive, especially at higher temperatures, and result in fast ion source performance degradation and a very limited lifetime [B.S. Freer, et. al., 2002 14th Intl. Conf. on Ion Implantation Technology Proc, IEEE Conf. Proc., p. 420 (2003)]. GeF{sub 4} and CO{sub 2} are commonly used to generate germanium and carbon beams. In the case of GeF{sub 4} controlling the tungsten deposition due to the de-composition of WF{sub 6} (halogen cycle) is critical to ion source life. With CO{sub 2}, the materials oxidation and carbon deposition must be controlled as both will affect cathode thermionic emission and anti-cathode (repeller) efficiencies due to the formation of volatile metal oxides. The improved ion source design Extended Life Source 3 (Eterna ELS3) together with its proprietary co-gas material implementation has demonstrated >300 hours of stable continuous operation when using carbon and germanium ion beams. Optimizing cogas chemistries retard the cathode erosion rate for germanium and carbon minimizes the adverse effects of oxygen when reducing gas is introduced for carbon. The proprietary combination of hardware and co-gas has improved source stability and the results of the hardware and co-gas development are discussed.

Hsieh, Tseh-Jen; Colvin, Neil; Kondratenko, Serguei [Axcelis Technologies, Inc. 108 Cherry Hill Drive, Beverly, MA 01915 (United States)

2012-11-06T23:59:59.000Z

271

Highly Polarized Ion Sources for Electron Ion Colliders (EIC)  

SciTech Connect (OSTI)

The operation of the RHIC facility at BNL and the Electron Ion Colliders (EIC) under development at Jefferson Laboratory and BNL need high brightness ion beams with the highest polarization. Charge exchange injection into a storage ring or synchrotron and Siberian snakes have the potential to handle the needed polarized beam currents, but first the ion sources must create beams with the highest possible polarization to maximize collider productivity, which is proportional to a high power of the polarization. We are developing one universal H-/D- ion source design which will synthesize the most advanced developments in the field of polarized ion sources to provide high current, high brightness, ion beams with greater than 90% polarization, good lifetime, high reliability, and good power efficiency. The new source will be an advanced version of an atomic beam polarized ion source (ABPIS) with resonant charge exchange ionization by negative ions. An integrated ABPIS design will be prepared based on new materials and an optimized magnetic focusing system. Polarized atomic and ion beam formation, extraction, and transport for the new source will be computer simulated.

V.G. Dudnikov, R.P. Johnson, Y.S. Derbenev, Y. Zhang

2010-03-01T23:59:59.000Z

272

Roughening instability and ion-induced viscous relaxation of SiO[sub 2] surfaces  

SciTech Connect (OSTI)

We characterize the development of nanometer scale topography (roughness) on SiO[sub 2] surfaces as a result of low energy, off-normal ion bombardment, using [ital in] [ital situ] energy dispersive x-ray reflectivity and atomic force microscopy. Surfaces roughen during sputtering by heavy ions (Xe), with roughness increasing approximately linearly with ion fluence up to 10[sup 17] cm[sup [minus]2]. A highly coherent ripple structure with wavelength of 30 nm and oriented with the wave vector parallel to the direction of incidence is observed after Xe sputtering at 1 keV. Lower frequency, random texture is also observed. Subsequent light ion (H, He) bombardment smoothens preroughened surfaces. The smoothing kinetics are first order with ion fluence and strongly dependent on ion energy in the range 0.2--1 eV. We present a linear model to account for the experimental observations which includes roughening both by random stochastic processes and by development of a periodic surface instability due to sputter yield variations with surface curvature which leads to ripple development. Smoothing occurs via ion bombardment induced viscous flow and surface diffusion. From the smoothing kinetics with H and He irradiation we measure the radiation enhanced viscosity of SiO[sub 2] and find values on the order of 1--20[times]10[sup 12] N s m[sup [minus]2]. The viscous relaxation per ion scales as the square root of the ion induced displacements in the film over the range of the ion penetration, suggesting short-lived defects with a bimolecular annihilation mechanism. The surface instability mechanism accounts for the ripple formation, while inclusion of stochastic roughening produces the random texture and reproduces the observed linear roughening kinetics and the magnitude of the overall roughness.

Mayer, T.M.; Chason, E.; Howard, A.J. (Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States))

1994-08-01T23:59:59.000Z

273

Compact ion accelerator source  

DOE Patents [OSTI]

An ion source includes a conductive substrate, the substrate including a plurality of conductive nanostructures with free-standing tips formed on the substrate. A conductive catalytic coating is formed on the nanostructures and substrate for dissociation of a molecular species into an atomic species, the molecular species being brought in contact with the catalytic coating. A target electrode placed apart from the substrate, the target electrode being biased relative to the substrate with a first bias voltage to ionize the atomic species in proximity to the free-standing tips and attract the ionized atomic species from the substrate in the direction of the target electrode.

Schenkel, Thomas; Persaud, Arun; Kapadia, Rehan; Javey, Ali

2014-04-29T23:59:59.000Z

274

MEASUREMENT OF CONDUCTING ION MOBILITY AND CONCENTRATIONIN ION-CONTAINING POLYMERS.  

E-Print Network [OSTI]

??In this study, we focus on how to measure conducting ion mobility and conducting ion number density in ion-containing polymers. From a fundamental side, we (more)

Choi, U Hyeok

2009-01-01T23:59:59.000Z

275

IonBeamMicroFab  

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

Ion Beam Manufacture of Microscale Ion Beam Manufacture of Microscale Tools and Components Manufacturing Technologies Sandia Manufacturing Science &Technology's Focused Ion Beam (FIB) laboratory provides an opportunity for research, development and prototyping. Currently, our scientists are devel- oping methods for ion beam sculpting microscale tools, components and devices. This includes shaping of specialty tools such as end-mills, turning tools and indenters. Many of these have been used in ultra-precision machining DOE applications. Additionally, staff are developing the capability to ion mill geo- metrically-complex features and substrates. This includes the ability to sputter predeter- mined curved shapes of various symmetries and periodicities. Capabilities and Expertise * Two custom-built focused ion beam sys-

276

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

277

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

278

Ion exchange technology assessment report  

SciTech Connect (OSTI)

In the execution of its charter, the SRS Ion Exchange Technology Assessment Team has determined that ion exchange (IX) technology has evolved to the point where it should now be considered as a viable alternative to the SRS reference ITP/LW/PH process. The ion exchange media available today offer the ability to design ion exchange processing systems tailored to the unique physical and chemical properties of SRS soluble HLW's. The technical assessment of IX technology and its applicability to the processing of SRS soluble HLW has demonstrated that IX is unquestionably a viable technology. A task team was chartered to evaluate the technology of ion exchange and its potential for replacing the present In-Tank Precipitation and proposed Late Wash processes to remove Cs, Sr, and Pu from soluble salt solutions at the Savannah River Site. This report documents the ion exchange technology assessment and conclusions of the task team.

Duhn, E.F.

1992-01-01T23:59:59.000Z

279

Ion exchange technology assessment report  

SciTech Connect (OSTI)

In the execution of its charter, the SRS Ion Exchange Technology Assessment Team has determined that ion exchange (IX) technology has evolved to the point where it should now be considered as a viable alternative to the SRS reference ITP/LW/PH process. The ion exchange media available today offer the ability to design ion exchange processing systems tailored to the unique physical and chemical properties of SRS soluble HLW`s. The technical assessment of IX technology and its applicability to the processing of SRS soluble HLW has demonstrated that IX is unquestionably a viable technology. A task team was chartered to evaluate the technology of ion exchange and its potential for replacing the present In-Tank Precipitation and proposed Late Wash processes to remove Cs, Sr, and Pu from soluble salt solutions at the Savannah River Site. This report documents the ion exchange technology assessment and conclusions of the task team.

Duhn, E.F.

1992-12-31T23:59:59.000Z

280

Dispersion of concentrated aqueous neodymiayttriaalumina mixture with ammonium poly(acrylic acid) as dispersant  

Science Journals Connector (OSTI)

A stable aqueous slurry using ammonium polyacrylic acid polyelectrolyte as dispersant and a neodymiayttriaalumina mixture was prepared as the starting powder. The effect of the polyelectrolyte concentration and the pH of the slurry on the stability of the suspension is studied, and the optimal pH value and the amount of dispersant needed to obtain a stable slurry were determined. Highly consistent slurries with optimal pH and dispersant concentration were prepared by ball milling. The rheological behavior of the slip with different solid loading (4858wt.%) has been studied by measuring the viscosity and shear stress as a function of shear rate. Slip with solid loadings of 53wt.% shows near-Newtonian behavior but becomes non-Newtonian with typical shear-thinning behavior above this solid loading value. The density and microstructure of the cast product bears a direct relationship to the state of the slip induced by variation of the pH and the concentration of the dispersant as well as by solid loading. Transparent Nd:YAG ceramics were obtained by sintering of compacts prepared from optimized slurries at 1750C in vacuum.

Yaohui Lv; Wei Zhang; Jie Tan; Yuanhua Sang; Haiming Qin; Jinlian Hu; Liuniu Tong; Hong Liu; Jiyang Wang; Robert I Boughton

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ion dispersion thermochronometry" 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

RHIC | Relativistic Heavy Ion Collider  

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

breakthrough accelerator could collide electrons with heavy ions or protons at nearly the speed of light to create "snapshots" of the force binding all visible matter. Accelerator...

282

Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries using Synchrotron Radiation Techniques  

E-Print Network [OSTI]

Relationships in the Li-Ion Battery Electrode Material LiNiAl foil may be used for Li ion battery cathode materials andElectrode materials, Li ion battery, Na ion battery, X-ray

Doeff, Marca M.

2013-01-01T23:59:59.000Z

283

Radiolytic effects on ion exchangers during the storage of radioactive wastes  

SciTech Connect (OSTI)

Radiolytic effects on ion exchangers are being recognized as a significant problem in the processing and storage of high-specific-activity radioactive waste forms. Two major literature surveys and a series of scoping experiments conducted during this investigation indicate that radiation decomposition of ion exchange materials has the potential for a variety of undesirable consequences. These include the ready dispersion of adsorbed radionuclides to the environment, corrosion and pressurization of waste canisters, and generation of flammable and explosive gases, as well as agglomeration of ion exchangers to a rigid monolith with the partitioning of a liquid phase. Some of the highlights of the literature surveys and the major findings of the experimental studies are reported here.

Pillay, K.K.S.; Palau, G.L.

1982-01-01T23:59:59.000Z

284

Heat transfer to impacting drops and post critical heat flux dispersed flow  

E-Print Network [OSTI]

Heat transfer to drops impacting on a hot surface is examined in context of dispersions of flowing, boiling fluids. The liquid contribution to heat transfer from a hot tube to a two-phase dispersion is formulated in terms ...

Kendall, Gail E.

1978-01-01T23:59:59.000Z

285

Stabilization of Hydrophobic Colloidal Dispersions in Water with Amphiphilic Polymers: Application to Integral  

E-Print Network [OSTI]

amphiphilic polymers ("amphipols"). These polymers, derived from poly(acrylic acid), adsorb onto the particleStabilization of Hydrophobic Colloidal Dispersions in Water with Amphiphilic Polymers: Application dispersions of highly hydrophobic colloidal particlesshere three integral membrane proteins of nanometric

286

Dispersion of Small Ceramic Particles (Al2O3) with Azotobacter vinelandii  

Science Journals Connector (OSTI)

...between particles, may be used as a dispersant. Currently, synthetic polymers from petrochemi- cals, such as polymethacrylic acid (PMAA) and polyacrylic acid (PAA), are used as dispersants (5, 6). However, com- mercial PMAA...

Tao Ren; Nancy B. Pellerin; Gordon L. Graff; Ilhan A. Aksay; James T. Staley

1992-09-01T23:59:59.000Z

287

Energy Dispersed Large Data Wave Maps in 2+1 Dimensions  

E-Print Network [OSTI]

of Finite S Norm Wave-Maps and Energy Dispersion 10.1renormalization of large energy wave maps. In: Journes of Finite S Norm Wave-Maps and Energy Dispersion In this

Sterbenz, Jacob; Tataru, Daniel

2010-01-01T23:59:59.000Z

288

Critique of Burnett-Frind dispersion tensor for axisymmetric porous media  

SciTech Connect (OSTI)

This technical note provides a critique of the Burnett and Frind (1987) dispersion tensor for porous media with axial symmetry based on a previous publication by the authors (Lichtner et aI., 2002). In this work a new approach is used based on unit eigenvectors which simplifies the analysis. It is demonstrated that the Burnett-Frind dispersion tensor, although acceptable for small values of the vertical velocity, produces the incorrect behavior for both longitudinal and transverse dispersivity as the flow velocity varies from parallel to perpendicular to the axis of symmetry. A new form of the dispersion tensor is derived for axially symmetric porous media involving four dispersivity coefficients corresponding to longitudinal and transverse dispersion in horizontal and vertical directions, defined as perpendicular and parallel to the axis of symmetry, respectively. This new dispersion tensor corrects two fundamental problems with the dispersion tensor proposed by Burnett and Frind (1987) for axial symmetric media.

Lichtner, Peter C [Los Alamos National Laboratory; Kelkar, Sharad [Los Alamos National Laboratory; Robinson, Bruce A [Los Alamos National Laboratory

2008-01-01T23:59:59.000Z

289

Using anisotropic dispersive materials for high-precision determination of the energy of charged particles  

Science Journals Connector (OSTI)

Vavilov-Cherenkov radiation (VCR) generated by a charged particle moving in a waveguide filled with an anisotropic dispersive material is considered. It is shown that, for a certain character of dispersion and...

A. V. Tyukhtin

2009-03-01T23:59:59.000Z

290

A microcomputer stochastic simulation model of seed dispersion of Melaleuca quinquenervia  

Science Journals Connector (OSTI)

A model simulates the pattern of wind-driven Melaleuca seed dispersion under normal south Florida weather conditions and a hurricane situation. Major factors determining the dispersion pattern are seed terminal velocity, height ...

Peter B. Schroeder; Joan A. Browder

1980-01-01T23:59:59.000Z

291

High temperature phonon dispersion in graphene using classical molecular dynamics  

SciTech Connect (OSTI)

Phonon dispersion and phonon density of states of graphene are calculated using classical molecular dynamics simulations. In this method, the dynamical matrix is constructed based on linear response theory by computing the displacement of atoms during the simulations. The computed phonon dispersions show excellent agreement with experiments. The simulations are done in both NVT and NPT ensembles at 300 K and found that the LO/TO modes are getting hardened at the ? point. The NPT ensemble simulations capture the anharmonicity of the crystal accurately and the hardening of LO/TO modes is more pronounced. We also found that at 300 K the C-C bond length reduces below the equilibrium value and the ZA bending mode frequency becomes imaginary close to ? along K-? direction, which indicates instability of the flat 2D graphene sheets.

Anees, P., E-mail: anees@igcar.gov.in; Panigrahi, B. K. [Materials Physics Division, Indira Gandhi Centre for Atomic Research, Kalpakkam-603102 (India); Valsakumar, M. C., E-mail: anees@igcar.gov.in [School of Engineering Sciences and Technology, University of Hyderabad, Hyderabad-500046 (India)

2014-04-24T23:59:59.000Z

292

Nematic droplets in aqueous dispersions of carbon nanotubes  

Science Journals Connector (OSTI)

Aqueous dispersions of exfoliated, bile-salt stabilized single-wall carbon nanotubes exhibit a first order transition to a nematic liquid-crystalline phase. The nematic phase presents itself in the form of micron-sized nematic droplets also known as tactoids, freely floating in the isotropic host dispersion. The nematic droplets are spindle shaped and have an aspect ratio of about four, irrespective of their size. We attribute this to a director field that is uniform rather than bipolar, which is confirmed by polarization microscopy. It follows that the ratio of the anchoring strength and the surface tension must be about four, which is quite larger than predicted theoretically but in line with earlier observations of bipolar tactoids. From the scatter in the data we deduce that the surface tension of the coexisting isotropic and nematic phases must be extremely low, that is, of the order of nN/m.

Nicolas Puech; Eric Grelet; Philippe Poulin; Christophe Blanc; Paul van der Schoot

2010-08-24T23:59:59.000Z

293

Mirror force induced wave dispersion in Alfvn waves  

SciTech Connect (OSTI)

Recent hybrid MHD-kinetic electron simulations of global scale standing shear Alfvn waves along the Earth's closed dipolar magnetic field lines show that the upward parallel current region within these waves saturates and broadens perpendicular to the ambient magnetic field and that this broadening increases with the electron temperature. Using resistive MHD simulations, with a parallel Ohm's law derived from the linear Knight relation (which expresses the current-voltage relationship along an auroral field line), we explore the nature of this broadening in the context of the increased perpendicular Poynting flux resulting from the increased parallel electric field associated with mirror force effects. This increased Poynting flux facilitates wave energy dispersion across field lines which in-turn allows for electron acceleration to carry the field aligned current on adjacent field lines. This mirror force driven dispersion can dominate over that associated with electron inertial effects for global scale waves.

Damiano, P. A.; Johnson, J. R. [Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543-0451 (United States)] [Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543-0451 (United States)

2013-06-15T23:59:59.000Z

294

Apparatus and method of dissociating ions in a multipole ion guide  

DOE Patents [OSTI]

A method of dissociating ions in a multipole ion guide is disclosed. A stream of charged ions is supplied to the ion guide. A main RF field is applied to the ion guide to confine the ions through the ion guide. An excitation RF field is applied to one pair of rods of the ion guide. The ions undergo dissociation when the applied excitation RF field is resonant with a secular frequency of the ions. The multipole ion guide is, but not limited to, a quadrupole, a hexapole, and an octopole.

Webb, Ian K.; Tang, Keqi; Smith, Richard D.; Ibrahim, Yehia M.; Anderson, Gordon A.

2014-07-08T23:59:59.000Z

295

FINITE VOLUME METHODS FOR UNIDIRECTIONAL DISPERSIVE WAVE MODELS  

E-Print Network [OSTI]

V95], the BBM equation [BBM72] and Boussinesq systems [Bou72, Per67, BCS02]. All these models as- sume to dispersive unidi- rectional water wave propagation in one space dimension. In particular we consider a KdV-BBM the KdV-BBM equation in its general form: ut + ux + uux - uxxt + uxxx = 0, (1.1) for x R, t > 0

Paris-Sud XI, Université de

296

Ris-M-2751 X-Ray Energy Dispersive  

E-Print Network [OSTI]

(PHOT) k«V 50 Risø National Laboratory, DK-4000 Roskilde, Denmark October 1988 #12;Ris*-M-2751 X-ray energy is impinging on the sample (Fig. lb). Its wavelength (photon energy) is in the course of measurements changedm ii. S Risø-M-2751 X-Ray Energy Dispersive Diffraction Lecture Notes Bronislaw Buras BaKo 30 40 E

297

Global regularity of critical Schrdinger maps: subthreshold dispersed energy  

E-Print Network [OSTI]

We consider the energy-critical Schroedinger map initial value problem with smooth initial data from R^2 into the sphere S^2. Given sufficiently energy-dispersed data with subthreshold energy, we prove that the system admits a unique global smooth solution. This improves earlier analogous conditional results. The key behind this improvement lies in exploiting estimates on the commutator of the Schroedinger map and harmonic map heat flows.

Paul Smith

2012-12-19T23:59:59.000Z

298

Laser acceleration of ion beams  

E-Print Network [OSTI]

We consider methods of charged particle acceleration by means of high-intensity lasers. As an application we discuss a laser booster for heavy ion beams provided, e.g. by the Dubna nuclotron. Simple estimates show that a cascade of crossed laser beams would be necessary to provide additional acceleration to gold ions of the order of GeV/nucleon.

I. A. Egorova; A. V. Filatov; A. V. Prozorkevich; S. A. Smolyansky; D. B. Blaschke; M. Chubaryan

2007-02-01T23:59:59.000Z

299

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

300

Review of ion accelerators  

SciTech Connect (OSTI)

The field of ion acceleration to higher energies has grown rapidly in the last years. Many new facilities as well as substantial upgrades of existing facilities have extended the mass and energy range of available beams. Perhaps more significant for the long-term development of the field has been the expansion in the applications of these beams, and the building of facilities dedicated to areas outside of nuclear physics. This review will cover many of these new developments. Emphasis will be placed on accelerators with final energies above 50 MeV/amu. Facilities such as superconducting cyclotrons and storage rings are adequately covered in other review papers, and so will not be covered here.

Alonso, J.

1990-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "ion dispersion thermochronometry" 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

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

302

Photo ion spectrometer  

DOE Patents [OSTI]

A charged particle spectrometer for performing ultrasensitive quantitative analysis of selected atomic components removed from a sample. Significant improvements in performing energy and angular refocusing spectroscopy are accomplished by means of a two dimensional structure for generating predetermined electromagnetic field boundary conditions. Both resonance and non-resonance ionization of selected neutral atomic components allow accumulation of increased chemical information. A multiplexed operation between a SIMS mode and a neutral atomic component ionization mode with EARTOF analysis enables comparison of chemical information from secondary ions and neutral atomic components removed from the sample. An electronic system is described for switching high level signals, such as SIMS signals, directly to a transient recorder and through a charge amplifier to the transient recorder for a low level signal pulse counting mode, such as for a neutral atomic component ionization mode.

Gruen, Dieter M. (Downers Grove, IL); Young, Charles E. (Westmont, IL); Pellin, Michael J. (Naperville, IL)

1989-01-01T23:59:59.000Z

303

Photo ion spectrometer  

DOE Patents [OSTI]

A charged particle spectrometer is described for performing ultrasensitive quantitative analysis of selected atomic components removed from a sample. Significant improvements in performing energy and angular refocusing spectroscopy are accomplished by means of a two dimensional structure for generating predetermined electromagnetic field boundary conditions. Both resonance and non-resonance ionization of selected neutral atomic components allow accumulation of increased chemical information. A multiplexed operation between a SIMS mode and a neutral atomic component ionization mode with EARTOF analysis enables comparison of chemical information from secondary ions and neutral atomic components removed from the sample. An electronic system is described for switching high level signals, such as SIMS signals, directly to a transient recorder and through a charge amplifier to the transient recorder for a low level signal pulse counting mode, such as for a neutral atomic component ionization mode. 12 figs.

Gruen, D.M.; Young, C.E.; Pellin, M.J.

1989-12-26T23:59:59.000Z

304

Wave front dispersion due to fluid-structure interaction in long liquid-filled pipelines  

E-Print Network [OSTI]

and dispersion than the corresponding standard water-hammer calculations. The reason is that a number of effects

Eindhoven, Technische Universiteit

305

Coronal ion-cyclotron beam instabilities within the multi-fluid description  

E-Print Network [OSTI]

Spectroscopic observations and theoretical models suggest resonant wave-particle interactions, involving high-frequency ion-cyclotron waves, as the principal mechanism for heating and accelerating ions in the open coronal holes. However, the mechanism responsible for the generation of the ion-cyclotron waves remains unclear. One possible scenario is that ion beams originating from small-scale reconnection events can drive micro-instabilities that constitute a possible source for the excitation of ion-cyclotron waves. In order to study ion beam-driven electromagnetic instabilities, the multi-fluid model in the low-beta coronal plasma is used. While neglecting the electron inertia this model allows one to take into account ion-cyclotron wave effects that are absent from the one-fluid MHD model. Realistic models of density and temperature as well as a 2-D analytical magnetic field model are used to define the background plasma in the open-field funnel region of a polar coronal hole. Considering the WKB approximation, a Fourier plane-wave linear mode analysis is employed in order to derive the dispersion relation. Ray-tracing theory is used to compute the ray path of the unstable wave as well as the evolution of the growth rate of the wave while propagating in the coronal funnel. We demonstrate that, in typical coronal holes conditions and assuming realistic values of the beam velocity, the free energy provided by the ion beam propagating parallel the ambient field can drive micro-instabilities through resonant ion-cyclotron excitation.

R. Mecheri; E. Marsch

2007-06-06T23:59:59.000Z

306

A Dispersive Treatment of $K_{\\ell4}$ Decays  

E-Print Network [OSTI]

$K_{\\ell4}$ decays offer several reasons of interest: they allow an accurate measurement of $\\pi\\pi$-scattering lengths; they provide the best source for the determination of some low-energy constants of ChPT; one form factor is directly related to the chiral anomaly, which can be measured here. We present a dispersive treatment of $K_{\\ell4}$ decays that provides a resummation of $\\pi\\pi$- and $K\\pi$-rescattering effects. The free parameters of the dispersion relation are fitted to the data of the high-statistics experiments E865 and NA48/2. The matching to ChPT at NLO and NNLO enables us to determine the LECs $L_1^r$, $L_2^r$ and $L_3^r$. With recently published data from NA48/2, the LEC $L_9^r$ can be determined as well. In contrast to a pure chiral treatment, the dispersion relation describes the observed curvature of one of the form factors, which we understand as a rescattering effect beyond NNLO.

Colangelo, Gilberto; Stoffer, Peter

2015-01-01T23:59:59.000Z

307

1-D profiling using highly dispersive guided waves  

SciTech Connect (OSTI)

Corrosion is one of the industries major issues regarding the integrity of assets. Currently, inspections are conducted at regular intervals to ensure a sufficient integrity level of these assets. Cost reduction while maintaining a high level of reliability and safety of installations is a major challenge. There are many situations where the actual defect location is not accessible, e.g., a pipe support or a partially buried pipe. Guided wave tomography has been developed to reconstruct the wall thickness of steel pipes. In case of bottom of the line corrosion, i.e., a single corrosion pit, a simpler approach may be followed. Data is collected in a pitch-catch configuration at the 12 o'clock position using highly dispersive guided waves. After dispersion correction the data collapses to a short pulse, any residual dispersion indicates wall loss. The phase spectrum is used to invert for the wall thickness profile in the circumferential direction, assuming a Gaussian defect profile. The approach is evaluated on numerically simulated and on measured data. The method is intended for rapid, semi-quantitative screening of pipes.

Volker, Arno; Zon, Tim van [TNO, Stieltjesweg 1, P.O. box 155 2600 AD Delft (Netherlands)

2014-02-18T23:59:59.000Z

308

Dispersion cancellation with phase-sensitive Gaussian-state light  

SciTech Connect (OSTI)

Franson's paradigm for nonlocal dispersion cancellation [J. D. Franson, Phys. Rev. A 45, 3126 (1992)] is studied using two kinds of jointly Gaussian-state signal and reference beams with phase-sensitive cross correlations. The first joint signal-reference state is nonclassical, with a phase-sensitive cross correlation that is at the ultimate quantum-mechanical limit. It models the outputs obtained from continuous-wave spontaneous parametric down-conversion. The second joint signal-reference state is classical--it has a proper P representation--with a phase-sensitive cross correlation that is at the limit set by classical physics. Using these states we show that a version of Franson's nonlocal dispersion cancellation configuration has essentially identical quantum and classical explanations except for the contrast obtained, which is much higher in the quantum case than it is in the classical case. This work bears on Franson's recent article [J. D. Franson, Phys. Rev. A 80, 032119 (2009)], which asserts that there is no classical explanation for all the features seen in quantum nonlocal dispersion cancellation.

Shapiro, Jeffrey H. [Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)

2010-02-15T23:59:59.000Z

309

Implications of ASOS winds on regulatory dispersion modeling applications  

SciTech Connect (OSTI)

With the advent of the Automated Surface Observing System (ASOS) throughout the United States during the 1990`s, an unprecedented level of meteorological data is now available. For the first time, observations of standard meteorological variables are available on a minute-by-minute basis. As a result, ASOS has tremendously increased the real-time data available for both weather forecasting and aviation purposes. However, the affect of the ASOS method of data collection on the dispersion modeling community is less clear. Because the hourly data now being reported at most stations across the country are being gathered in a fundamentally different way than previously, it is prudent to examine the differences between hourly meteorological observations gathered before and after ASOS. This paper scrutinizes wind speed and direction data gathered at Baltimore-Washington International Airport and Washington Dulles International Airport and quantifies the differences. Wind data are critical in determining the transport and dispersion of pollutant plumes. Relationships between manually gathered wind data and ASOS wind data are examined. Finally, potential ramifications on dispersion modeling applications are discussed.

Jones, W.B.; Brower, R.P. [Versar, Inc., Columbia, MD (United States)

1998-12-31T23:59:59.000Z

310

Dispersed slurry catalysts for hydroconversion of carbonaceous materials  

SciTech Connect (OSTI)

Dispersed slurry catalysts, based upon the in situ sulfided forms of transition metals such as iron and molybdenum, have been developed and successfully employed in the multi-stage hydroconversion of various carbonaceous materials including coal, heavy petroleum resid, waste plastics, and different combinations of these feedstocks. For example, using HTI`s proprietary iron-based catalyst and commercial Molyvan-A additive, over 95% maf coal conversion has been obtained accompanied by over 90% maf conversion of 524{degrees}C+ residuum and over 65% maf yield of C{sub 4}-524{degrees}C distillate yield in a fully back-mixed high pressure reaction system. The use of an in-fine fixed-bed hydrotreater in such a hydroconversion process that relies only on dispersed slurry catalysts for conversion allows to selectively upgrade the light distillate products (IBP-400{degrees}C) from the process resulting in premium quality naphtha and mid-distillate products with less than 10 ppm nitrogen, an FUC ratio of 1.9, and about 20 ppm sulfur. The use of dispersed catalyst for such hydroconversion processes has a significant positive impact (as much as 20% cost potential reduction) on the process economics because the reactor throughput can be increased by as much as 70 % while maintaining the equivalent residence time and the cost associated with the expensive high pressure catalyst addition/withdrawal system, used for supported extrudate catalyst, and that associated with expensive ebullating pumps can be reduced or eliminated completely.

Lee, L.K.; Pradhan, V.R.; Popper, G.; Comolli, A.G. [Hydrocarbon Technologies, Inc., Lawrenceville, NJ (United States)

1996-12-31T23:59:59.000Z

311

Solenoid and monocusp ion source  

DOE Patents [OSTI]

An ion source which generates hydrogen ions having high atomic purity incorporates a solenoidal permanent magnets to increase the electron path length. In a sealed envelope, electrons emitted from a cathode traverse the magnetic field lines of a solenoid and a monocusp magnet between the cathode and a reflector at the monocusp. As electrons collide with gas, the molecular gas forms a plasma. An anode grazes the outer boundary of the plasma. Molecular ions and high energy electrons remain substantially on the cathode side of the cusp, but as the ions and electrons are scattered to the aperture side of the cusp, additional collisions create atomic ions. The increased electron path length allows for smaller diameters and lower operating pressures.

Brainard, John Paul (Albuquerque, NM); Burns, Erskine John Thomas (Albuquerque, NM); Draper, Charles Hadley (Albuquerque, NM)

1997-01-01T23:59:59.000Z

312

Solenoid and monocusp ion source  

DOE Patents [OSTI]

An ion source which generates hydrogen ions having high atomic purity incorporates a solenoidal permanent magnets to increase the electron path length. In a sealed envelope, electrons emitted from a cathode traverse the magnetic field lines of a solenoid and a monocusp magnet between the cathode and a reflector at the monocusp. As electrons collide with gas, the molecular gas forms a plasma. An anode grazes the outer boundary of the plasma. Molecular ions and high energy electrons remain substantially on the cathode side of the cusp, but as the ions and electrons are scattered to the aperture side of the cusp, additional collisions create atomic ions. The increased electron path length allows for smaller diameters and lower operating pressures. 6 figs.

Brainard, J.P.; Burns, E.J.T.; Draper, C.H.

1997-10-07T23:59:59.000Z

313

Ion chamber based neutron detectors  

DOE Patents [OSTI]

A neutron detector with monolithically integrated readout circuitry, including: a bonded semiconductor die; an ion chamber formed in the bonded semiconductor die; a first electrode and a second electrode formed in the ion chamber; a neutron absorbing material filling the ion chamber; and the readout circuitry which is electrically coupled to the first and second electrodes. The bonded semiconductor die includes an etched semiconductor substrate bonded to an active semiconductor substrate. The readout circuitry is formed in a portion of the active semiconductor substrate. The ion chamber has a substantially planar first surface on which the first electrode is formed and a substantially planar second surface, parallel to the first surface, on which the second electrode is formed. The distance between the first electrode and the second electrode may be equal to or less than the 50% attenuation length for neutrons in the neutron absorbing material filling the ion chamber.

Derzon, Mark S; Galambos, Paul C; Renzi, Ronald F

2014-12-16T23:59:59.000Z

314

The spatial, temporal, and configurational characteristics of geographic dispersion in teams  

Science Journals Connector (OSTI)

As organizations operate across greater distances, scholars are increasingly interested in the work of geographically dispersed teams and the technologies that they use to communicate and coordinate their work. However, research has generally not specified ... Keywords: configuration, dispersion, distance, geographically dispersed teams, technology use, virtual teams

Michael Boyer O'Leary; Jonathon N. Cummings

2007-09-01T23:59:59.000Z

315

Linear wave dispersion laws in unmagnetized relativistic plasma: Analytical and numerical results  

E-Print Network [OSTI]

cases sufficient for describing the wave motion. The power of these dispersion laws residesLinear wave dispersion laws in unmagnetized relativistic plasma: Analytical and numerical results, SE-751 21 Uppsala, Sweden Received 22 August 2000; accepted 30 January 2001 In this paper dispersion

316

Microcalorimeter-type energy dispersive X-ray spectrometer for a transmission electron microscope  

Science Journals Connector (OSTI)

......Microscopy (1986) New York: Plenum Press. 4...Garratt-Reed A J , Bell D C. Energy-Dispersive X-ray...Microscopy (1996) New York: Plenum Press. 19...Microcalorimeter-type energy dispersive X-ray...electron microscope. | A new energy dispersive......

Toru Hara; Keiichi Tanaka; Keisuke Maehata; Kazuhisa Mitsuda; Noriko Y. Yamasaki; Mitsuaki Ohsaki; Katsuaki Watanabe; Xiuzhen Yu; Takuji Ito; Yoshihiro Yamanaka

2010-02-01T23:59:59.000Z

317

Support vector machine approach for longitudinal dispersion coefficients in natural streams  

Science Journals Connector (OSTI)

This paper presents the support vector machine approach to predict the longitudinal dispersion coefficients in natural rivers. Collected published data from the literature for the dispersion coefficient for wide range of flow conditions are used for ... Keywords: Dispersion, Rivers, Streams, Support vector machine

H. Md. Azamathulla; Fu-Chun Wu

2011-03-01T23:59:59.000Z

318

Sex-biased dispersal in sperm whales: contrasting mitochondrial and nuclear genetic  

E-Print Network [OSTI]

Sex-biased dispersal in sperm whales: contrasting mitochondrial and nuclear genetic structure mammals is characterized by female philopatry and male dispersal. Such sex-biased dispersal can causeDNA) and the bi-parental nuclear genome. Here we report on the global genetic structure of oceanic populations

Leimar, Olof

319

Population structure and dispersal in a patchy landscape: nuclear and mitochondrial markers reveal  

E-Print Network [OSTI]

Population structure and dispersal in a patchy landscape: nuclear and mitochondrial markers reveal that suggest limited dispersal, combined with area effects most likely caused by expansion from refugial­620. ADDITIONAL KEYWORDS: balancing selection ­ colour polymorphism ­ dispersal ­ disturbance ­ gene-flow ­ land

Gillespie, Rosemary

320

Creation of the model and implementation of the simulation of dispersion of air pollution in urban  

E-Print Network [OSTI]

Creation of the model and implementation of the simulation of dispersion of air pollution in urban..............................................................................................................1 1.2. Types of models of dispersion of air pollution was creation of the mathematical model and application of the simulation of dispersion of vehicular air

Bargiela, Andrzej

Note: This page contains sample records for the topic "ion dispersion thermochronometry" 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

Breeding Dispersal and Nesting Behavior of Burrowing Owls Following Experimental Nest1 D. H. CATLIN1  

E-Print Network [OSTI]

Breeding Dispersal and Nesting Behavior of Burrowing Owls Following Experimental Nest1 Predation2 3 97331, dan.rosenberg@oregonstate.edu7 ABSTRACT8 Nest predation is considered a primary factor affecting the hypothesis that nest predation would10 increase dispersal probability, dispersal distance and the frequency

Rosenberg, Daniel K.

322

Ion-cyclotron instability in current-carrying Lorentzian (kappa) and Maxwellian plasmas with anisotropic temperatures: A comparative study  

SciTech Connect (OSTI)

Current-driven electrostatic ion-cyclotron instability has so far been studied for Maxwellian plasma with isotropic and anisotropic temperatures. Since satellite-measured particle velocity distributions in space are often better modeled by the generalized Lorentzian (kappa) distributions and since temperature anisotropy is quite common in space plasmas, theoretical analysis of the current-driven, electrostatic ion-cyclotron instability is carried out in this paper for electron-proton plasma with anisotropic temperatures, where the particle parallel velocity distributions are modeled by kappa distributions and the perpendicular velocity distributions are modeled by Maxwellian distributions. Stability properties of the excited ion cyclotron modes and, in particular, their dependence on electron to ion temperature ratio and ion temperature anisotropy are presented in more detail. For comparison, the corresponding results for bi-Maxwellian plasma are also presented. Although the stability properties of the ion cyclotron modes in the two types of plasmas are qualitatively similar, significant quantitative differences can arise depending on the values of {kappa}{sub e} and {kappa}{sub i}. The comparative study is based on the numerical solutions of the respective linear dispersion relations. Quasilinear estimates of the resonant ion heating rates due to ion-cyclotron turbulence in the two types of plasma are also presented for comparison.

Basu, B. [Air Force Research Laboratory, Hanscom Air Force Base, Massachusetts 01731 (United States); Grossbard, N. J. [Boston College, Chestnut Hill, Massachusetts 02467 (United States)

2011-09-15T23:59:59.000Z

323

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

324

4th Generation ECR Ion Sources  

E-Print Network [OSTI]

4th Generation ECR Ion Sources Claude M Lyneis, D. Leitner,to developing a 4 th generation ECR ion source with an RFover current 3 rd generation ECR ion sources, which operate

Lyneis, Claude M.

2010-01-01T23:59:59.000Z

325

Dispersion modeling of selected \\{PAHs\\} in urban air: A new approach combining dispersion model with GIS and passive air sampling  

Science Journals Connector (OSTI)

Abstract This study introduces a new combined air concentration measurement and modeling approach that we propose can be useful in medium and long term air quality assessment. A dispersion study was carried out for four high molecular weight polycyclic aromatic hydrocarbons (PAHs) in an urban area with industrial, traffic and domestic heating sources. A geographic information system (GIS) was used both for processing of input data as well as visualization of the modeling results. The outcomes of the dispersion model were compared to the results of passive air sampling (PAS). Despite discrepancies between measured and modeled concentrations, an approach combining the two techniques is promising for future air quality assessment. Differences between measured and modeled concentrations, in particular when measured values exceed the modeled concentrations, are indicative of undocumented, sporadic pollutant sources. Thus, these differences can also be useful for assessing and refining emission inventories.

Ond?ej S?ka; Lisa Melymuk; Pavel ?upr; Alice Dvorsk; Jana Klnov

2014-01-01T23:59:59.000Z

326

Ion Rings for Magnetic Fusion  

SciTech Connect (OSTI)

This Final Technical Report presents the results of the program, Ion Rings for Magnetic Fusion, which was carried out under Department of Energy funding during the period August, 1993 to January, 2005. The central objective of the program was to study the properties of field-reversed configurations formed by ion rings. In order to reach this objective, our experimental program, called the Field-reversed Ion Ring Experiment, FIREX, undertook to develop an efficient, economical technology for the production of field-reversed ion rings. A field-reversed configuration (FRC) in which the azimuthal (field-reversing) current is carried by ions with gyro-radius comparable to the magnetic separatrix radius is called a field-reversed ion ring. A background plasma is required for charge neutralization of the ring, and this plasma will be confined within the ring's closed magnetic flux. Ion rings have long been of interest as the basis of compact magnetic fusion reactors, as the basis for a high-power accelerator for an inertial fusion driver, and for other applications of high power ion beams or plasmas of high energy density. Specifically, the FIREX program was intended to address the longstanding question of the contribution of large-orbit ions to the observed stability of experimental FRCs to the MHD tilt mode. Typical experimental FRCs with s {approx} 2-4, where s is the ratio of separatrix radius to ion gyro-radius, have been stable to tilting, but desired values for a fusion reactor, s > 20, should be unstable. The FIREX ring would consist of a plasma with large s for the background ions, but with s {approx} 1 for the ring ions. By varying the proportions of these two populations, the minimum proportion of large-orbit ions necessary for stability could be determined. The incorporation of large-orbit ions, perhaps by neutral-beam injection, into an FRC has been advanced for the purpose of stabilizing, heating, controlling angular momentum, and aiding the formation of a reactor-scale FRC, and the FIREX program was intended to test the ideas behind this approach. We will describe in this report the technological development path and advances in physics understanding that allowed FIREX to reach a regime in which ion rings were reproducibly created with up to about half the current necessary to produce field reversal. Unfortunately, the experiments were limited to this level by a fundamental, unanticipated aspect of the physics of strong ion rings in plasma. The FIREX ring is a strongly anisotropic, current-carrying population of ions moving faster than the Alfven speed in the background plasma. The rapidly changing ring current excites very large-amplitude Alfven waves in the plasma, and these waves strongly affect the ring, causing rapid energy loss in a way that is not compatible with the success of the ring trapping scenario around which FIREX was designed. The result was that FIREX rings were always very short-lived. We will discuss the implication of these results for possible future use of large-orbit ions in FRCs. In short, it appears that a certain range of the parameters characterizing the ring Alfven mach number and distribution function must be avoided to allow the existence of a long-lived energetic ion component in an FRC. This report will explain why FIREX experimental results cannot be directly scaled to quantitatively predict this range for a particular FRC configuration. This will require accurate, three-dimensional simulations. FIREX results do constitute a very good dataset for validating such a code, and simulations already carried out during this program provide a guide to the important physics involved.

Greenly, John, B.

2005-07-31T23:59:59.000Z

327

Simultaneous Suppression of Third-Order Dispersion and Sideband Instability in Single-Channel Optical Fiber Transmission by Midway Optical Phase Conjugation Employing Higher Order Dispersion Management  

Science Journals Connector (OSTI)

In optical phase conjugation (OPC) systems, the third-order dispersion (TOD) of optical fibers and the nonlinear resonance at well-defined signal sideband frequencies called sideband...

Kaewplung, Pasu; Angkaew, Tuptim; Kikuchi, Kazuro

2003-01-01T23:59:59.000Z

328

High Current Ion Sources and Injectors for Heavy Ion Fusion  

SciTech Connect (OSTI)

Heavy ion beam driven inertial fusion requires short ion beam pulses with high current and high brightness. Depending on the beam current and the number of beams in the driver system, the injector can use a large diameter surface ionization source or merge an array of small beamlets from a plasma source. In this paper, we review the scaling laws that govern the injector design and the various ion source options including the contact ionizer, the aluminosilicate source, the multicusp plasma source, and the MEVVA source.

Kwan, Joe W.

2005-02-15T23:59:59.000Z

329

Simulation of ion beam transport through the 400 Kv ion implanter at Michigan Ion Beam Laboratory  

SciTech Connect (OSTI)

The Michigan Ion Beam Laboratory houses a 400 kV ion implanter. An application that simulates the ion beam trajectories through the implanter from the ion source to the target was developed using the SIMION Registered-Sign code. The goals were to have a tool to develop an intuitive understanding of abstract physics phenomena and diagnose ion trajectories. Using this application, new implanter users of different fields in science quickly understand how the machine works and quickly learn to operate it. In this article we describe the implanter simulation application and compare the parameters of the implanter components obtained from the simulations with the measured ones. The overall agreement between the simulated and measured values of magnetic fields and electric potentials is {approx}10%.

Naab, F. U.; Toader, O. F.; Was, G. S. [Department of Engineering and Radiological Sciences, University of Michigan, 2355 Bonisteel Boulevard, Ann Arbor, MI 48109-2104 (United States)

2013-04-19T23:59:59.000Z

330

Study of Ion Cooling and Ejection from Two Stage Linear Quadrupole Ion Trap consisted of RFQ ion guides  

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

Ion Cooling and Ejection from Two Stage Linear Quadrupole Ion Trap consisted of RFQ ion guides Ion Cooling and Ejection from Two Stage Linear Quadrupole Ion Trap consisted of RFQ ion guides Kozlovskiy V.I., Filatov V. V., Shchepunov (UNIRIB, O.R.A.U. Oak Ridge, TN, USA) V. A., Brusov V. S., Pikhtelev A. R., Zelenov V. V. Introduction The primary objective of this work concerns linear quadrupole ion traps, which are commonly used to interface a continuous ion beam from an external source with a mass analyzer, requiring bunched or pulsed beams. We assume that the ions prepared for mass analysis, are well spatially shaped, and normalized by ion kinetic energy. (Slava, I don't understand the meaning of the previous sentence - I wrote it as I interpreted what you are saying - I may be all wrong) In our work, such a device was developed and built to interface a source of continuous ion beams and a

331

Ion transport through cell membrane channels  

E-Print Network [OSTI]

We discuss various models of ion transport through cell membrane channels. Recent experimental data shows that sizes of ion channels are compared to those of ions and that only few ions may be simultaneously in any single channel. Theoretical description of ion transport in such channels should therefore take into account interactions between ions and between ions and channel proteins. This is not satisfied by macroscopic continuum models based on Poisson-Nernst-Planck equations. More realistic descriptions of ion transport are offered by microscopic Brownian and molecular dynamics. One should also take into account a dynamical character of the channel structure. This is not yet addressed in the literature

Jan Gomulkiewicz; Jacek Miekisz; Stanislaw Miekisz

2007-06-05T23:59:59.000Z

332

Ion Beams - Radiation Effects Facility / Cyclotron Institute...  

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

Ion Beams Available Beams Beam Change Times Measurements Useful Graphs Various ion beams have been developed specifically for the Radiation Effects Facility. These beams...

333

The use of synthetic hydrocalcite as a chloride-ion getter for a barrier aluminum anodization process  

SciTech Connect (OSTI)

Chloride ion contamination at parts per billion concentrations plaques electrochemists studying barrier anodic aluminum oxide film growth and anodic aluminum oxide capacitor manufacturers. Chloride ion contamination slows film growth and reduces film quality. We have demonstrated that synthetic hydrocalcite substantially reduces the detrimental effects of chloride ion contamination in an aqueous electrolyte commonly used to grow barrier anodic aluminum oxide. We have determined that problems arise if precautions are not taken when using synthetic hydrocalcite as a chloride-ion getter in an aqueous electrolyte. Synthetic hydrocalcite is somewhat hydrophobic. If this powder is added directly to an aqueous electrolyte, some powder disperses; some floats to the top of the bath and forms scum that locally impedes anodic film formation. Commercially available powder contains a wide range of particle sizes including submicrometer-sized particles that can escape through filters into the electrolyte and cause processing problems. These problems can be over come if (1) the getter is placed in filter bags, (2) a piece of filter paper is used to skim trace amounts of getter floating on the top of the bath, (3) dummy runs are performed to scavenge chloride-ion loaded getter micelles dispersed in the bath, and (4) substrates are rinsed with a strong stream of deionized water to remove trace amounts of powder after anodization.

Panitz, J.K.G.; Sharp, D.J.

1995-11-01T23:59:59.000Z

334

Method and apparatus for directing ions and other charged particles generated at near atmospheric pressures into a region under vacuum  

DOE Patents [OSTI]

A method and apparatus for focusing dispersed charged particles. More specifically, a series of elements within a region maintained at a pressure between 10.sup.-1 millibar and 1 bar, each having successively larger apertures forming an ion funnel, wherein RF voltages are applied to the elements so that the RF voltage on any element has phase, amplitude and frequency necessary to define a confinement zone for charged particles of appropriate charge and mass in the interior of the ion funnel, wherein the confinement zone has an acceptance region and an emmitance region and where the acceptance region area is larger than the emmitance region area.

Smith, Richard D. (Richland, WA); Shaffer, Scott A. (Seattle, WA)

2000-01-01T23:59:59.000Z

335

Atmospheric Dispersion and Consequence Analysis at Sandia's TA-V Nuclear Facilities  

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

Atmospheric Dispersion and Atmospheric Dispersion and Consequence Analysis at Sandia's TA-V Nuclear Facilities Jim Dahl Manager, Nuclear Safety Analysis Sandia National Laboratories Office: 505-284-9067 Email: jjdahl@sandia.gov SAND2012-4478P Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy's National Nuclear Security Administration under contract DE-AC04-94AL85000. 2 Dispersion and Consequence Analysis at Sandia's TA-V Topics: * Site Characteristics * Dispersion Analysis Inputs - Meteorological Data - Stability Class - Dispersion Coefficients - Deposition Velocity

336

Heavy ion fusion--Using heavy ions to make electricity  

E-Print Network [OSTI]

for a practical fusion power reactor. HIF is the only fusionenter the reactor chamber, and focus Heavy Ion Fusion ontoengineering test reactor. The promise of fusion as a power

Celata, C.M.

2004-01-01T23:59:59.000Z

337

Plasma ion sources and ion beam technology inmicrofabrications  

SciTech Connect (OSTI)

For over decades, focused ion beam (FIB) has been playing a very important role in microscale technology and research, among which, semiconductor microfabrication is one of its biggest application area. As the dimensions of IC devices are scaled down, it has shown the need for new ion beam tools and new approaches to the fabrication of small-scale devices. In the meanwhile, nanotechnology has also deeply involved in material science research and bioresearch in recent years. The conventional FIB systems which utilize liquid gallium ion sources to achieve nanometer scale resolution can no longer meet the various requirements raised from such a wide application area such as low contamination, high throughput and so on. The drive towards controlling materials properties at nanometer length scales relies on the availability of efficient tools. In this thesis, three novel ion beam tools have been developed and investigated as the alternatives for the conventional FIB systems in some particular applications. An integrated focused ion beam (FIB) and scanning electron microscope (SEM) system has been developed for direct doping or surface modification. This new instrument employs a mini-RF driven plasma source to generate focused ion beam with various ion species, a FEI two-lens electron (2LE) column for SEM imaging, and a five-axis manipulator system for sample positioning. An all-electrostatic two-lens column has been designed to focus the ion beam extracted from the source. Based on the Munro ion optics simulation, beam spot sizes as small as 100 nm can be achieved at beam energies between 5 to 35 keV if a 5 {micro}m-diameter extraction aperture is used. Smaller beam spot sizes can be obtained with smaller apertures at sacrifice of some beam current. The FEI 2LE column, which utilizes Schottky emission, electrostatic focusing optics, and stacked-disk column construction, can provide high-resolution (as small as 20 nm) imaging capability, with fairly long working distance (25 mm) at 25 keV beam voltage. Such an integrated FIB/SEM dual-beam system will not only improve the accuracy and reproducibility when performing ion beam sculpting and direct implantation processes, but will also enable researchers to perform cross-sectioning, imaging, and analysis with the same tool. A major advantage of this approach is the ability to produce a wide variety of ion species tailored to the application.

Ji, Lili

2007-09-01T23:59:59.000Z

338

Heavy Ion Collisions at RHIC  

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

at Heavy Ion Colliders at Heavy Ion Colliders Theory Drivers & View from LHC Urs Achim Wiedemann CERN PH-TH NSAC Implementation Subcommittee Hearings 7 September 2012 Heavy Ion Physics - Main Tools of Theorists Understanding properties of hot and dense matter from the elementary interactions in QCD High Energy Physics String Theory Computational Physics Fluid Dynamics Dissipative fluid dynamic description * Based on: E-p conservation: 2 nd law of thermodynamics: * Sensitive to properties of matter that are calculated from first principles in quantum field theory - EOS: and sound velocity - transport coefficients: shear , bulk viscosity, conductivities ...

339

Three chamber negative ion source  

DOE Patents [OSTI]

It is an object of this invention provide a negative ion source which efficiently provides a large flux of negatively ionized particles. This invention provides a volume source of negative ions which has a current density sufficient for magnetic fusion applications and has electrons suppressed from the output. It is still another object of this invention to provide a volume source of negative ions which can be electrostatically accelerated to high energies and subsequently neutralized to form a high energy neutral beam for use with a magnetically confined plasma.

Leung, K.N.; Ehlers, K.W.; Hiskes, J.R.

1983-11-10T23:59:59.000Z

340

Graphene/Li-ion battery  

Science Journals Connector (OSTI)

Density function theory calculations were carried out to clarify storage states of Lithium (Li) ions in graphene clusters. The adsorption energy spin polarization charge distribution electronic gap surface curvature and dipole momentum were calculated for each cluster. Li-ion adsorbed graphene doped by one Li atom is spin polarized so there would be different gaps for different spin polarization in electrons. Calculation results demonstrated that a smaller cluster between each two larger clusters is preferable because it could improve grapheneLi-ion batteries; consequently the most proper graphene anode structure has been proposed.

Narjes Kheirabadi; Azizollah Shafiekhani

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ion dispersion thermochronometry" 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

Improving dispersibility of hafnium diboride in aqueous media using polyacrylic acid and ammonium citrate  

Science Journals Connector (OSTI)

Abstract It has been well accepted that polyacrylic acid (PAA) is an effective dispersant for metal diborides (such as ZrB2) in aqueous media. However, when dispersing HfB2 powder, the dispersing effect is reduced significantly. In this work, a second dispersant, ammonium citrate, was used to resolve this problem. It was found that a PAAammonium citrate binary dispersant system could effectively enhance the zeta potential, increase the PAA adsorption content, and improve the stability of HfB2. The apparent viscosities of the suspensions were also investigated. Results showed that the PAAammonium citrate binary dispersant system was effective for improving the dispersion of HfB2 particles in aqueous media.

Gang Wang; Rujie He; Feng He

2014-01-01T23:59:59.000Z

342

Parametric instabilities of parallel propagating incoherent Alfvn waves in a finite ion beta plasma  

Science Journals Connector (OSTI)

Large amplitude low-frequency Alfvn waves constitute one of the most essential elements of magnetohydrodynamic(MHD)turbulence in the fast solar wind. Due to small collisionless dissipation rates the waves can propagate long distances and efficiently convey such macroscopic quantities as momentum energy and helicity. Since loading of such quantities is completed when the waves damp away it is important to examine how the waves can dissipate in the solar wind. Among various possible dissipation processes of the Alfvn waves parametric instabilities have been believed to be important. In this paper we numerically discuss the parametric instabilities of coherent/incoherent Alfvn waves in a finite ion beta plasma using a one-dimensional hybrid (superparticle ions plus an electron massless fluid) simulation in order to explain local production of sunward propagating Alfvn waves as suggested by Helios/Ulysses observation results. Parameter studies clarify the dependence of parametric instabilities of coherent/incoherent Alfvn waves on the ion and electron beta ratio. Parametric instabilities of coherent Alfvn waves in a finite ion beta plasma are vastly different from those in the cold ions (i.e. MHD and/or Hall-MHD systems) even if the collisionless damping of the Alfvn waves are neglected. Further nonlinearly driven modulational instability is important for the dissipation of incoherent Alfvn waves in a finite ion beta plasma regardless of their polarization since the ion kinetic effects let both the right-hand and left-hand polarized waves become unstable to the modulational instability. The present results suggest that although the antisunward propagating dispersive Alfvn waves are efficiently dissipated through the parametric instabilities in a finite ion beta plasma these instabilities hardly produce the sunward propagating waves.

Y. Nariyuki; T. Hada; K. Tsubouchi

2007-01-01T23:59:59.000Z

343

Efficient Ion Heating via Finite-Larmor-Radius Ion-Cyclotron Waves in a Plasma  

Science Journals Connector (OSTI)

Ion heating by externally launched ion Bernstein waves is investigated in the ACT-1 hydrogen plasma. Detailed measurements of wave absorption and of the ion temperature profiles have clearly identified various heating layers near the ion-cyclotron harmonics of deuteriumlike and tritiumlike ions. The observed bulk ion heating with heating quality factor of 10 eV/W.(1010 cm-3) and the power balance estimates suggest excellent overall efficiency for finite-Larmor-radius-ion-cyclotron-resonance-frequency heating.

M. Ono; G. A. Wurden; K. L. Wong

1984-01-02T23:59:59.000Z

344

Spatial Dispersion of Peering Clusters in the European Internet  

E-Print Network [OSTI]

section by analyzing the determinants of bilateral peering decisions. Finally, section 5 concludes. 2 Agglomeration in the Internet In one of the earliest contributions of the renewed debate on the geographical agglomeration of economic activity Krugman... .0136 Paris, France -0.03448 0.00762 0.23892 random RONIX -0.22 Bucharest, Romania -0.05 0.00881 -1.8113 dispersed TIX -0.0267 Zurich, Switzerland -0.02222 0.00157 -0.1141 random TOPIX -0.077 Torino, Italy -0.09091 0.00894 0.1466 random VIX 0.07147 Vienna...

D'Ignazio, Alessio; Giovannetti, Emanuele

2006-03-14T23:59:59.000Z

345

RADIONUCLIDE DISPERSION RATES BY AEOLIAN, FLUVIAL, AND POROUS MEDIA TRANSPORT  

SciTech Connect (OSTI)

Radionuclide transport was measured from high grade uranium ore boulders near the Nopal I Site, Chihuahua, Mexico. High grade uranium ore boulders were left behind after removal of a uranium ore stockpile at the Prior High Grade Stockpile (PHGS). During the 25 years when the boulder was present, radionuclides were released and transported by sheetflow during precipitation events, wind blown resuspension, and infiltration into the unsaturated zone. In this study, one of the boulders was removed, followed by grid sampling of the surrounding area. Measured gamma radiation levels in three dimensions were used to derive separate dispersion rates by the three transport mechanisms.

J. Walton; P. Goodell; C. Brashears; D. French; A. Kelts

2005-07-11T23:59:59.000Z

346

Kappa - Poincare dispersion relations and the black hole radiation  

E-Print Network [OSTI]

Following the methods developed by Corley and Jacobson, we consider qualitatively the issue of Hawking radiation in the case when the dispersion relation is dictated by quantum kappa-Poincare algebra. This relation corresponds to field equations that are non-local in time, and, depending on the sign of the parameter kappa, to sub- or superluminal signal propagation. We also derive the conserved inner product, that can be used to count modes, and therefore to obtain the spectrum of black hole radiation in this case.

A. Blaut; J. Kowalski-Glikman; D. Nowak-Szczepaniak

2001-08-28T23:59:59.000Z

347

Extracellular Proteins Limit the Dispersal of BiogenicNanoparticles  

SciTech Connect (OSTI)

High spatial-resolution secondaryion microprobespectrometry, synchrotron radiation Fourier-transform infraredspectroscopy and polyacrylamide gel analysis demonstrate the intimateassociation of proteins with spheroidal aggregates of biogenic zincsulfide nanocrystals, an example of extracellular biomineralization.Experiments involving synthetic ZnS nanoparticles and representativeamino acids indicate a driving role for cysteine in rapid nanoparticleaggregation. These findings suggest that microbially-derivedextracellular proteins can limit dispersal of nanoparticulatemetal-bearing phases, such as the mineral products of bioremediation,that may otherwise be transported away from their source by subsurfacefluid flow.

Moreau, John W.; Weber, Peter K.; Martin, Michael C.; Gilbert,Benjamin; Hutcheon, Ian D.; Banfield, Jillian F.

2007-04-27T23:59:59.000Z

348

Dispersion toughened ceramic composites and method for making same  

DOE Patents [OSTI]

Ceramic composites exhibiting increased fracture toughness are produced by the simultaneous codeposition of silicon carbide and titanium disilicide by chemical vapor deposition. A mixture of hydrogen, methyltrichlorosilane and titanium tetrachloride is introduced into a furnace containing a substrate such as graphite or silicon carbide. The thermal decomposition of the methyltrichlorosilane provides a silicon carbide matrix phase and the decomposition of the titanium tetrachloride provides a uniformly dispersed second phase of the intermetallic titanium disilicide within the matrix phase. The fracture toughness of the ceramic composite is in the range of about 6.5 to 7.0 MPa..sqrt..m which represents a significant increase over that of silicon carbide.

Stinton, D.P.; Lackey, W.J.; Lauf, R.J.

1984-09-28T23:59:59.000Z

349

Dispersion toughened ceramic composites and method for making same  

DOE Patents [OSTI]

Ceramic composites exhibiting increased fracture toughness are produced by the simultaneous codeposition of silicon carbide and titanium disilicide by chemical vapor deposition. A mixture of hydrogen, methyltrichlorosilane and titanium tetrachloride is introduced into a furnace containing a substrate such as graphite or silicon carbide. The thermal decomposition of the methyltrichlorosilane provides a silicon carbide matrix phase and the decomposition of the titanium tetrachloride provides a uniformly dispersed second phase of the intermetallic titanium disilicide within the matrix phase. The fracture toughness of the ceramic composite is in the range of about 6.5 to 7.0 MPa.sqroot.m which represents a significant increase over that of silicon carbide.

Stinton, David P. (Knoxville, TN); Lackey, Walter J. (Oak Ridge, TN); Lauf, Robert J. (Oak Ridge, TN)

1986-01-01T23:59:59.000Z

350

Model-Independent Semileptonic Form Factors Using Dispersion Relations  

E-Print Network [OSTI]

We present a method for parametrizing heavy meson semileptonic form factors using dispersion relations, and from it produce a two-parameter description of the B -> B elastic form factor. We use heavy quark symmetry to relate this function to B -> D* l nu form factors, and extract |V_cb|=0.0355^{+0.0029}_{-0.0025} from experimental data with a least squares fit. Our method eliminates model-dependent uncertainties inherent in choosing a parametrization for the extrapolation of the differential decay rate to threshold.

C. G. Boyd; B. Grinstein; R. Lebed

1995-08-04T23:59:59.000Z

351

ION Engineering | Open Energy Information  

Open Energy Info (EERE)

ION Engineering ION Engineering Jump to: navigation, search Name ION Engineering Place Boulder, Colorado Zip 80301 Sector Carbon Product ION is the first clean-tech company to successfully integrate ionic liquids in solutions to capture carbon and other contaminants from gases Coordinates 42.74962°, -109.714163° 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":42.74962,"lon":-109.714163,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

352

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

353

Ion Implantation for Surface Engineering  

Science Journals Connector (OSTI)

Low energy accelerators are used widely for the modification of materials and in research on material properties. The ion implantation of semiconductors becomes an industrial application of major importance. T...

P. Mazzoldi

1992-01-01T23:59:59.000Z

354

Metal-Ion-Mediated Reactions  

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

Metal-Ion-Mediated Reactions Metal-Ion-Mediated Reactions Metal-Ion-Mediated Reactions Print Monday, 19 December 2011 18:29 While mononuclear, polynuclear, and polymeric metal complexes are most often synthesized by the reaction of a metal precursor and a presynthesized organic ligand, it is also possible to generate the ligand in situ from an easily available organic compound. This approach allows the reactivity of the metal ion to activate a proligand, transforming it through an in situ reaction, sometimes providing coordination compounds with ligands not accessible by conventional organic synthesis. The intense interest in the reactivity of coordinated ligands is mainly due to the necessity of interpreting the mechanisms of homogeneous metal-catalyzed processes, in which a substrate is activated upon its coordination to one or more metal sites. A coordinated oxime group contains three active sites (C, N, O) for reactivity.

355

Neon Ion Beam Lithography (NIBL)  

E-Print Network [OSTI]

Existing techniques for electron- and ion-beam lithography, routinely employed for nanoscale device fabrication and mask/mold prototyping, do not simultaneously achieve efficient (low fluence) exposure and high resolution. ...

Winston, Donald

356

RHIC | Electron-Ion Collider  

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

particle accelerator could collide electrons with heavy ions or protons at nearly the speed of light to create rapid-fire, high-resolution "snapshots" of the force binding all...

357

Reactive Ion Benjamin A. Small  

E-Print Network [OSTI]

(torr) plasma etching reactive ion etching ion milling m cm 100µm µm #12;5 Mechanics ~40 mTorrE380 kHz, 13.56 MHz ~30 sccm #12;6 Chemistry X X X X F- F- F-F- X F-F- F- F- F- R++ R++ R++ #12;7 Chemistry before opening · Silanes are explosive in the atmosphere #12;13 Bibliography Campbell, Stephen A

Garmestani, Hamid

358

Turbulent transport of energetic ions  

SciTech Connect (OSTI)

Approaching ITER operation, the issue of anomalous transport of fast particles becomes more and more important. This is partly because the ITER heating and current drive system relies heavily on neutral beam injection. Moreover burning plasmas are heated by fast fusion {alpha} particles.Fusion {alpha} particles are characterised by a fixed energy and an isotropic velocity distribution. Therefore they have gyroradii one magnitude larger than the thermal ions. The dependency of the particle diffusion of {alpha} test particles on the Kubo number K = VExB{tau}c/{lambda}c (VExB mean E x B velocity, {tau}c, {lambda}c correlation time and length of the turbulent potential) is presented. For different turbulent regimes, different dependency of the diffusion on the gyroradius is found. For large Kubo numbers, the transport is found to remain constant for gyroradii up to the correlation length of the potential, whereas it is drastically reduced in the small Kubo number regime.In the second part, a model for beam ions injected along the equilibrium magnetic field is described. The beam ions are treated gyrokinetically in a self-consistent way with the equilibrium distribution function taken as a shifted Maxwellian. The implications of such a model for the Vlasov equation, the field equations, and the calculation of moments and fluxes are discussed. Linear and nonlinear results, obtained with the gyrokinetic flux tube code GENE show the existence of a new instability driven by fast beam ions. The instability has a maximum growth rate at perpendicular wave numbers of ky{rho}s {approx} 0.15 and depends mainly on the beam velocity and the density gradient of the beam ions. This instability leads to a replacement of bulk ion particle transport by fast ion particle transport, connected to a strongly enhanced heat flux. In the presence of this instability, the turbulent particle and heat transport is dominated by fast ions.

Dannert, Tilman; Hauff, Thilo; Jenko, Frank; Guenter, Sibylle [Max-Planck-Institut fuer Plasmaphysik, Garching (Germany)

2006-11-30T23:59:59.000Z

359

Kinetic stabilization of interchange modes in an axisymmetric mirror by large orbit radius thermal ions  

SciTech Connect (OSTI)

A dispersion functional analysis that includes the full kinetic effects of large Larmor radius thermal ions is applied to the problem of stability of an axisymmetric mirror to finite azimuthal mode number ({ital m}) interchange modes. Vlasov theory is used to describe the ions, which are imbedded in a background of fluid electrons. The dispersion functional is solved numerically, both for a trial function displacement, where only the growth rate is determined, and the general case, where both the displacement and the growth rate are determined. In the trial function case, it is found that finite Larmor radius (FLR) effects are recovered, with a significant reduction in the growth rate when ({rho}{sub {ital i}}/{ital L}){sup 2}{approx gt}{gamma}{sub MHD}/{Omega}{sub {ital i}}. In a general case, the growth rate is reduced, but not so strongly as in the trial function case. It is shown heuristically that FLR effects may be recovered from the analysis and that these effects increase with the phase-space decorrelation time of the thermal ion distribution.

Krall, J.; Seyler, C.E.; Sudan, R.N. (Laboratory of Plasma Studies, Cornell University, Ithaca, New York 14853 (US))

1991-04-01T23:59:59.000Z

360

Kinetic stabilization of interchange modes in an axisymmetric mirror by large orbit radius thermal ions  

Science Journals Connector (OSTI)

A dispersion functional analysis that includes the full kinetic effects of large Larmor radius thermal ions is applied to the problem of stability of an axisymmetric mirror to finite azimuthal mode number (m) interchange modes. Vlasov theory is used to describe the ions which are imbedded in a background of fluid electrons. The dispersion functional is solved numerically both for a trial function displacement where only the growth rate is determined and the general case where both the displacement and the growth rate are determined. In the trial function case it is found that finite Larmor radius (FLR) effects are recovered with a significant reduction in the growth rate when (? i /L)2?? MHD /? i . In a general case the growth rate is reduced but not so strongly as in the trial function case. It is shown heuristically that FLR effects may be recovered from the analysis and that these effects increase with the phase?space decorrelation time of the thermal ion distribution.

J. Krall; C. E. Seyler; R. N. Sudan

1991-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ion dispersion thermochronometry" 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

Assessment of Potential for Ion Driven Fast Ignition  

E-Print Network [OSTI]

mm radius ion beams Fast Ignition (laser or fast ion pulse)deg half cone angle Fast Ignition (laser or fast ion pulse)ion beam pulses for fast ignition, laser generated ion beams

2005-01-01T23:59:59.000Z

362

Orthogonal ion injection apparatus and process  

DOE Patents [OSTI]

An orthogonal ion injection apparatus and process are described in which ions are directly injected into an ion guide orthogonal to the ion guide axis through an inlet opening located on a side of the ion guide. The end of the heated capillary is placed inside the ion guide such that the ions are directly injected into DC and RF fields inside the ion guide, which efficiently confines ions inside the ion guide. Liquid droplets created by the ionization source that are carried through the capillary into the ion guide are removed from the ion guide by a strong directional gas flow through an inlet opening on the opposite side of the ion guide. Strong DC and RF fields divert ions into the ion guide. In-guide orthogonal injection yields a noise level that is a factor of 1.5 to 2 lower than conventional inline injection known in the art. Signal intensities for low m/z ions are greater compared to convention inline injection under the same processing conditions.

Kurulugama, Ruwan T; Belov, Mikhail E

2014-04-15T23:59:59.000Z

363

Perspective Ion Channels: From Conductance to Structure  

E-Print Network [OSTI]

membrane is an essen- tially insurmountable barrier for the flow of ions; therefore, ion transport is carried out by membrane-embedded specialized proteins in the form of transporters and ion channels a purely electrical concept to a structural dynamics view of ions in- teracting with a membrane protein

Bezanilla, Francisco

364

Lens system for a photo ion spectrometer  

DOE Patents [OSTI]

A lens system in a photo ion spectrometer for manipulating a primary ion beam and ionized atomic component is disclosed. The atomic components are removed from a sample by a primary ion beam using the lens system, and the ions are extracted for analysis. The lens system further includes ionization resistant coatings for protecting the lens system. 8 figs.

Gruen, D.M.; Young, C.E.; Pellin, M.J.

1990-11-27T23:59:59.000Z

365

Lens system for a photo ion spectrometer  

DOE Patents [OSTI]

A lens system in a photo ion spectrometer for manipulating a primary ion beam and ionized atomic component. The atomic components are removed from a sample by a primary ion beam using the lens system, and the ions are extracted for analysis. The lens system further includes ionization resistant coatings for protecting the lens system.

Gruen, Dieter M. (Downers Grove, IL); Young, Charles E. (Westmont, IL); Pellin, Michael J. (Napersville, IL)

1990-01-01T23:59:59.000Z

366

Nonphotochemical hole burning and dispersive kinetics in amorphous solids  

SciTech Connect (OSTI)

Results covering burn intensities in the nW to {mu}W/cm{sup 2} range, of dispersive hole growth kinetics are reported for Oxazine 720 in glycerol glasses and polyvinyl alcohol polymer films and their deuterated analogues. A theoretical model which employs a distribution function for the hole burning rate constant based upon a Gaussian distribution for the tunnel parameter is shown to accurately describe the kinetic data. This model incorporates the linear electron-phonon coupling. A method for calculating the nonphotochemical quantum yield is presented which utilizes the Gaussian distribution of tunnel parameters. The quantum yield calculation can be extended to determine a quantum yield as a function of hole depth. The effect of spontaneous hole filling is shown to be insignificant over the burn intensity range studied. Average relaxation rates for hole burning are {approximately}8 orders of magnitude greater than for hole filling. The dispersive kinetics of hole burning are observed to be independent over the temperature range of these experiments, 1.6 to 7.0 K. 6 refs., 20 figs., 1 tab.

Kenney, M.J.

1990-09-21T23:59:59.000Z

367

Monolayer graphene dispersion and radiative cooling for high power LED  

Science Journals Connector (OSTI)

Molecular fan, a radiative cooling by thin film, has been developed and its application for compact electronic devices has been evaluated. The enhanced surface emissivity and heat dissipation efficiency of the molecular fan coating are shown to correlate with the quantization of lattice modes in active nanomaterials. The highly quantized G and 2D bands in graphene are achieved by our dispersion technique, and then incorporated in an organic-inorganic acrylate emulsion to form a coating assembly on heat sinks (for LED and CPU). This water-based dielectric layer coating has been formulated and applied on metal core printed circuit boards. The heat dissipation efficiency and breakdown voltage are evaluated by a temperature-monitoring system and a high-voltage breakdown tester. The molecular fan coating on heat dissipation units is able to decrease the equilibrium junction temperature by 29.1? C, while functioning as a dielectric layer with a high breakdown voltage (>5kV). The heat dissipation performance of the molecular fan coating applied on LED devices shows that the coated 50W LED gives an enhanced cooling of 20% at constant light brightness. The schematics of monolayer graphene dispersion, undispersed graphene platelet, and continuous graphene sheet are illustrated and discussed to explain the mechanisms of radiative cooling, radiative/non-radiative, and non-radiative heat re-accumulation.

Tun-Jen Hsiao; Tsehaye Eyassu; Kimberly Henderson; Taesam Kim; Chhiu-Tsu Lin

2013-01-01T23:59:59.000Z

368

Dispersion model development for open burn/open detonation sources  

SciTech Connect (OSTI)

The disposal of obsolete munitions, propellants, and manufacturing wastes is conducted at Department of Defense (DOD) and Department of Energy (DOE) facilities. The most common disposal method is open burning (OB) and open detonation (OD) of the material, which occurs in an earthen pit or bermed area. OB/OD operations generate air pollutants and require predictions of pollutant concentrations. The pollutants include SO{sub 2}, NO{sub x}, particulates, volatile organic compounds and toxic materials such as metals, semivolatile organics, etc. Dispersion models are used to estimate pollutant concentrations given the source and meteorological conditions. However, there is currently no recommended EPA dispersion model to address OB/OD sources. Due to the constraints of existing models, a model development program was initiated under the DOD/DOE Strategic Environmental Research and Development Program. In Section 2, the authors give an overview of the model design which is divided into simple and research components. Sections 3 and 4 describe the simple component which includes Gaussian puff and analytic plume models.

Weil, J.C.; Templeman, B. [Univ. of Colorado, Boulder, CO (United States); Banta, R.; Weber, R. [NOAA-ETL, Boulder, CO (United States). Environmental Research Labs.; Mitchell, W. [Environmental Protection Agency, Research Triangle Park, NC (United States)

1996-12-31T23:59:59.000Z

369

Advective diffusive/dispersive transport in geochemical processes  

SciTech Connect (OSTI)

Comprehensive understanding of chemical transport in response to fluid flow and diffusion in geologic processes requires thermodynamic and transport properties of a wide variety of aqueous species at the temperature and pressure of interest, as well as mass transfer computer codes that provide simultaneously for fluid flow, diffusion, dispersion, homogeneous chemical reactions, and mineral solubilities. As a result of research carried out with support from DOE in prior years of this grant, considerable progress has been made in developing computer codes to calculate advective-dispersive-diffusional transport at both high and low pressures and temperatures. These codes have become highly sophisticated, but their application to geochemical processes is limited by the availability of thermodynamic and transport data for the major solute species in the aqueous phase. Over the past three years, research has been directed primarily toward characterizing the thermodynamic behavior of concentrated supercritical aqueous electrolyte solutions and predicting the diffusion coefficients of organic species in oil field brines. Related research has been concerned with characterizing the growth rate of hydrothermal alteration zones and assessing the relative importance of aqueous diffusion and heterogeneous reactions at mineral surfaces in geochemical processes. 103 refs., 12 figs.

Helgeson, H.C.

1991-05-28T23:59:59.000Z

370

Observations of strong ion-ion correlations in dense plasmas  

SciTech Connect (OSTI)

Using simultaneous spectrally, angularly, and temporally resolved x-ray scattering, we measure the pronounced ion-ion correlation peak in a strongly coupled plasma. Laser-driven shock-compressed aluminum at ?3 solid density is probed with high-energy photons at 17.9?keV created by molybdenum He-? emission in a laser-driven plasma source. The measured elastic scattering feature shows a well-pronounced correlation peak at a wave vector of k=4{sup ?1}. The magnitude of this correlation peak cannot be described by standard plasma theories employing a linear screened Coulomb potential. Advanced models, including a strong short-range repulsion due to the inner structure of the aluminum ions are however in good agreement with the scattering data. These studies have demonstrated a new highly accurate diagnostic technique to directly measure the state of compression and the ion-ion correlations. We have since applied this new method in single-shot wave-number resolved S(k) measurements to characterize the physical properties of dense plasmas.

Ma, T., E-mail: ma8@llnl.gov; Pak, A.; Landen, O. L.; Le Pape, S.; Turnbull, D.; Dppner, T. [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)] [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States); Fletcher, L.; Galtier, E.; Hastings, J.; Lee, H. J.; Nagler, B.; Glenzer, S. H. [SLAC National Accelerator Laboratory, Menlo Park, California 94025 (United States)] [SLAC National Accelerator Laboratory, Menlo Park, California 94025 (United States); Chapman, D. A. [Plasma Physics Group, AWE plc, Reading RG7 4PR (United Kingdom) [Plasma Physics Group, AWE plc, Reading RG7 4PR (United Kingdom); Centre for Fusion, Space and Astrophysics, Department of Physics, University of Warwick, Coventry CV4 7AL (United Kingdom); Falcone, R. W. [Physics Department, University of California, Berkeley, California 94720 (United States)] [Physics Department, University of California, Berkeley, California 94720 (United States); Fortmann, C. [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States) [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States); Department of Physics and Astronomy, University of California, Los Angeles, California 90095 (United States); Gericke, D. O. [Centre for Fusion, Space and Astrophysics, Department of Physics, University of Warwick, Coventry CV4 7AL (United Kingdom)] [Centre for Fusion, Space and Astrophysics, Department of Physics, University of Warwick, Coventry CV4 7AL (United Kingdom); Gregori, G.; White, T. G. [University of Oxford, Clarendon Laboratory, Oxford OX1 3PU (United Kingdom)] [University of Oxford, Clarendon Laboratory, Oxford OX1 3PU (United Kingdom); Neumayer, P. [Extreme Matter Institute, GSI Helmholtzzentrum fr Schwerionenforschung, Planckstr. 1, 64291 Darmstadt (Germany)] [Extreme Matter Institute, GSI Helmholtzzentrum fr Schwerionenforschung, Planckstr. 1, 64291 Darmstadt (Germany); Vorberger, J. [Max Planck Institut fr Physik komplexer Systeme, Ntthnizer Strae 38, 01187 Dresden (Germany)] [Max Planck Institut fr Physik komplexer Systeme, Ntthnizer Strae 38, 01187 Dresden (Germany); and others

2014-05-15T23:59:59.000Z

371

Liver antioxidant and plasmatic immune responses in juvenile1 golden grey mullet (Liza aurata) exposed to dispersed crude oil2  

E-Print Network [OSTI]

) exposed to dispersed crude oil2 3 Thomas Milinkovitch1* , Awa Ndiaye2 , Wilfried Sanchez2 , Stéphane Le ; CD : Chemically Dispersed oil ; D : Dispersant solution ; MD : Mechanically Dispersed oil; WSF application is an oil spill response technique. To evaluate the environmental31 cost of this operation

Paris-Sud XI, Université de

372

Enhanced immunological and detoxification responses in Pacific oysters, Crassostrea gigas, exposed1 to chemically dispersed oil2  

E-Print Network [OSTI]

to chemically dispersed oil2 3 Luna-Acosta, A.a,* , Kanan, R.b , Le Floch, S.b , Huet, V.a , Pineau P;Abstract: The aim of this study was to evaluate the effects of chemically dispersed oil on an20 of the chemical dispersant. After 2 days of exposure to chemically dispersed28 oil, alkylated naphthalenes

Boyer, Edmond

373

Ion specific effects on phase transitions in protein solutions  

Science Journals Connector (OSTI)

A recent Monte Carlo simulation determined the potential of mean force between two lysozyme molecules in various aqueous solutions [M. Lund et al., Phys. Rev. Lett. 100, 258105 (2008)]. The study involved a combination of explicit solvent and continuum model simulations and showed that there are significant ion-specific protein-protein interactions due to hydrophobic patches on the protein surfaces. In this paper we use the results of their study to determine the phase diagram for lysozyme for aqueous solutions of NaCl and NaI. Two of the three phase diagrams have a stable fluid-fluid critical point, while the third has a slightly metastable critical point. This results from a secondary extremum in the potential associated with a repulsive interaction. This repulsive interaction reduces the effective range of the attractive interaction and produces a metastable critical point. We compare the results of one of these phase diagrams with that for a model that includes ion-dispersion forces, but does not contain solvent structural effects.

S. Lettieri; Xiaofei Li; J. D. Gunton

2009-03-10T23:59:59.000Z

374

Opportunistic Mass Measurements at the Holifield Radioactive Ion Beam Facility  

SciTech Connect (OSTI)

A technique for measuring mass differences has been developed at the Holifield Radioactive Ion Beam Facility (HRIBF) that requires no specialized equipment. Mass differences are measured as position differences between known and unknown-mass isobars, dispersed at the image of the energy-analyzing magnet following the 25MV tandem post-accelerator, and identified by an energy-loss measurement. The technique has been demonstrated on neutron-rich 77 79Cu and 83 86Ge isotopes produced using the isotope separator online (ISOL) method with the 238U(p,fission) reaction, where a mass accuracy of 500 keV was achieved. These nuclides are well suited to the measurement technique, as they readily migrate out of the production target and to the ion source and comprise the most neutron-rich elements of the isobarically mixed beam. Because modest precision mass values can be obtained with only a few tens of counts of the nuclide of interest among orders of magnitude more of the isobaric neighbors closer to stability, the sensitivity of this technique makes it appropriate for initial mass measurements far from stability.

Hausladen, Paul [ORNL; Beene, James R [ORNL; Galindo-Uribarri, Alfredo {nmn} [ORNL; Larochelle, Y [University of Tennessee, Knoxville (UTK); Liang, J Felix [ORNL; Mueller, Paul Edward [ORNL; Shapira, Dan [ORNL; Stracener, Daniel W [ORNL; Thomas, J. S. [Rutgers University; Varner Jr, Robert L [ORNL; Wollnik, Hermann [ORNL

2006-01-01T23:59:59.000Z

375

Distribution of ions in cochlear tissues: Effects of noise exposure  

Science Journals Connector (OSTI)

To assess the role of altered ion distribution in noise?induced hearing loss the element content of isolated outer hair cells (OHCs) stria vascularis and spiral ligament was studied utilizing the energy dispersive X?ray analysis (EDXA) mode of the scanning electron microscope. In the normal chinchilla inner ear EDXA spectra from non?nuclear regions of OHCs showed high levels of Cl and K with relatively low P S and Na. OHC nuclei were similar but with high P. In contrast both non?nuclear and nuclear regions of stria vascularis were characterized by high P and K with Cl and Na significantly lower than in OHCs. The element content of the spiral ligament varied in a regular manner with the location sampled. Exposure to a two?octave (14145656 Hz) band of noise for 1 h at intensities from 90? to 120?dB SPL had no effect upon the element content of stria. OHC spectra were also unchanged in intact cells. Degenerating cells showed elevated Cl and K levels. The results suggest that changes in the ionic content of OHCs and stria vascularis are not involved in the temporary effects of noise. However altered ion distribution does appear to be associated with the degeneration of OHCs after intense sound exposure.

Allen Ryan; M. Gary Wickham; Robert C. Bone

1978-01-01T23:59:59.000Z

376

Theoretical overview: Light ion lessons, heavy ion hopes  

SciTech Connect (OSTI)

Experiments using light ion beams of atomic masses A {approximately} 30 have been underway since 1986 at the Brookhaven AGS and the CERN SPS at the respective energies {radical}s {approximately} 5 A GeV and 20 A GeV. The first truly heavy ion runs with a gold beam began this spring at the AGS. In this talk I will survey our progress towards an understanding of nuclear collision dynamics, focusing on those issues that are relevant to Au+Au at the AGS. In view of what we have already learned from the light ion data, I will argue that the prospects for producing matter at extreme density in these experiments are excellent.

Gavin, S.

1992-12-31T23:59:59.000Z

377

Theoretical overview: Light ion lessons, heavy ion hopes  

SciTech Connect (OSTI)

Experiments using light ion beams of atomic masses A [approximately] 30 have been underway since 1986 at the Brookhaven AGS and the CERN SPS at the respective energies [radical]s [approximately] 5 A GeV and 20 A GeV. The first truly heavy ion runs with a gold beam began this spring at the AGS. In this talk I will survey our progress towards an understanding of nuclear collision dynamics, focusing on those issues that are relevant to Au+Au at the AGS. In view of what we have already learned from the light ion data, I will argue that the prospects for producing matter at extreme density in these experiments are excellent.

Gavin, S.

1992-01-01T23:59:59.000Z

378

Ultrafast dark-field surface inspection with hybrid-dispersion laser scanning  

SciTech Connect (OSTI)

High-speed surface inspection plays an important role in industrial manufacturing, safety monitoring, and quality control. It is desirable to go beyond the speed limitation of current technologies for reducing manufacturing costs and opening a new window onto a class of applications that require high-throughput sensing. Here, we report a high-speed dark-field surface inspector for detection of micrometer-sized surface defects that can travel at a record high speed as high as a few kilometers per second. This method is based on a modified time-stretch microscope that illuminates temporally and spatially dispersed laser pulses on the surface of a fast-moving object and detects scattered light from defects on the surface with a sensitive photodetector in a dark-field configuration. The inspector's ability to perform ultrafast dark-field surface inspection enables real-time identification of difficult-to-detect features on weakly reflecting surfaces and hence renders the method much more practical than in the previously demonstrated bright-field configuration. Consequently, our inspector provides nearly 1000 times higher scanning speed than conventional inspectors. To show our method's broad utility, we demonstrate real-time inspection of the surface of various objects (a non-reflective black film, transparent flexible film, and reflective hard disk) for detection of 10??m or smaller defects on a moving target at 20?m/s within a scan width of 25?mm at a scan rate of 90.9?MHz. Our method holds promise for improving the cost and performance of organic light-emitting diode displays for next-generation smart phones, lithium-ion batteries for green electronics, and high-efficiency solar cells.

Yazaki, Akio [Department of Electrical Engineering, University of California, Los Angeles, California 90095 (United States); Yokohama Research Laboratory, Hitachi, Ltd., Kanagawa 244-0817 (Japan); Kim, Chanju [Department of Electrical Engineering, University of California, Los Angeles, California 90095 (United States); Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, Gwangju 500-712 (Korea, Republic of); Chan, Jacky [Department of Electrical Engineering, University of California, Los Angeles, California 90095 (United States); Mahjoubfar, Ata [Department of Electrical Engineering, University of California, Los Angeles, California 90095 (United States); California NanoSystems Institute, University of California, Los Angeles, California 90095 (United States); Goda, Keisuke, E-mail: goda@chem.s.u-tokyo.ac.jp [Department of Electrical Engineering, University of California, Los Angeles, California 90095 (United States); Department of Chemistry, University of Tokyo, Tokyo 113-0033 (Japan); Watanabe, Masahiro [Yokohama Research Laboratory, Hitachi, Ltd., Kanagawa 244-0817 (Japan); Jalali, Bahram [Department of Electrical Engineering, University of California, Los Angeles, California 90095 (United States); California NanoSystems Institute, University of California, Los Angeles, California 90095 (United States); Department of Bioengineering, University of California, Los Angeles, California 90095 (United States); Department of Surgery, David Geffen School of Medicine, University of California, Los Angeles, California 90095 (United States)

2014-06-23T23:59:59.000Z

379

Coordinated FA-MS and SIFT-MS analyses of breath following ingestion of D2O and ethanol: total body water, dispersal kinetics and ethanol metabolism  

Science Journals Connector (OSTI)

A coordinated study of the dispersal of water between the various body compartments (stomach and gut, blood stream and tissue) and the similar dispersal kinetics of ethanol and its metabolism has been carried out involving two healthy volunteers using flowing afterglow mass spectrometry, FA-MS, and selected ion flow tube mass spectrometry, SIFT-MS. Thus, using these techniques, the variations of HDO and ethanol in breath, measured in successive single exhalations, were followed in real time after the ingestion of measured quantities of D2O and ethanol in proportion to the body weights of the subjects at the dose rates D2O ~ 0.283 g kg1, ethanol ~0.067 g kg1. During the FA-MS experimental periods (about 2 h), the dispersion of HDO into the body water and finally its equilibration in the total body water is observed from which total body water for each subject was determined. In the SIFT-MS measurements, the dispersion of ethanol into the body water and its loss via metabolism was observed until the physiological (pre-dose) breath level of ethanol for each individual was restored. A simple linear transformation is used to derive the time variations of the blood levels of HDO and ethanol. This has allowed a comparison of the fractions of the ingested ethanol that are metabolized during first-pass metabolism for the two subjects. Thus, in one subject 30% and in the other subject 40% of the ingested alcohol is metabolized in the first 20 min following ingestion. The good time resolution allowed by non-invasive breath analysis ensures that the rates of processes such as ethanol metabolism can be accurately measured. Simultaneous measurements of breath acetaldehyde (largely formed via the ethanol metabolism) and acetone were also performed during the SIFT-MS single breath exhalations.

Patrik pan?l; Tianshu Wang; David Smith

2005-01-01T23:59:59.000Z

380

Characterization of an iodine-based ionic liquid ion source and studies on ion fragmentation  

E-Print Network [OSTI]

Electrosprays are a well studied source of charged droplets and ions. A specific subclass is the ionic liquid ion source (ILIS), which produce ion beams from the electrostatically stressed meniscus of ionic liquids. ILIS ...

Fedkiw, Timothy Peter

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ion dispersion thermochronometry" 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

Calculation of the ion transverse velocity distribution function under ion cyclotron resonance heating  

Science Journals Connector (OSTI)

The ion transverse velocity distribution functions and the fraction ? of ions heated above a certain energy W 1 are calculated as applied to the ion cyclotron resonance heating method of isotope s...

A. I. Karchevskii; E. P. Potanin

2004-06-01T23:59:59.000Z

382

Ion Heating in ATC Tokamak in the Ion-Cyclotron Range of Frequencies  

Science Journals Connector (OSTI)

Ion heating by irradiation of rf fields in the ion-cyclotron range of frequencies is investigated using several diagnostic techniques. It is shown that substantial heating of the bulk of the ions can be achieved by this method.

H. Takahashi; C. C. Daughney; R. A. Ellis; Jr.; R. J. Goldton; H. Hsuan; T. Nagashima; F. J. Paoloni; A. J. Sivo; S. Suckewer

1977-07-04T23:59:59.000Z

383

An investigation of numerical dispersion in the hot water injection process  

E-Print Network [OSTI]

dispersion is important in the simulation of the hot water injection process with heat loss. Numerical results are compared to the analytical solution of the simple convective-diffusion problem and Lauwerier's analytical solution to the hot water... simulated, then some type of method for controlling numerical dispersion will have to be implemented. It is obvious from the numerical results that numerical dispersion is affected by injection velocity and distance travelled, but these variables do...

McVay, Duane Allen

2012-06-07T23:59:59.000Z

384

Ion distributions at charged aqueous surfaces: Synchrotron X-ray scattering studies  

SciTech Connect (OSTI)

Surface sensitive synchrotron X-ray scattering studies were performed to obtain the distribution of monovalent ions next to a highly charged interface at room temperature. To control surface charge density, lipids, dihexadecyl hydrogen-phosphate (DHDP) and dimysteroyl phosphatidic acid (DMPA), were spread as monolayer materials at the air/water interface, containing CsI at various concentrations. Five decades in bulk concentrations (CsI) are investigated, demonstrating that the interfacial distribution is strongly dependent on bulk concentration. We show that this is due to the strong binding constant of hydronium H3O+ to the phosphate group, leading to proton-transfer back to the phosphate group and to a reduced surface charge. Using anomalous reflectivity off and at the L3 Cs+ resonance, we provide spatial counterion (Cs+) distributions next to the negatively charged interfaces. The experimental ion distributions are in excellent agreement with a renormalized surface charge Poisson-Boltzmann theory for monovalent ions without fitting parameters or additional assumptions. Energy Scans at four fixed momentum transfers under specular reflectivity conditions near the Cs+ L3 resonance were conducted on 10-3 M CsI with DHDP monolayer materials on the surface. The energy scans exhibit a periodic dependence on photon momentum transfer. The ion distributions obtained from the analysis are in excellent agreement with those obtained from anomalous reflectivity measurements, providing further confirmation to the validity of the renormalized surface charge Poisson-Boltzmann theory for monovalent ions. Moreover, the dispersion corrections f0 and f00 for Cs+ around L3 resonance, revealing the local environment of a Cs+ ion in the solution at the interface, were extracted simultaneously with output of ion distributions.

Bu, Wei

2009-08-15T23:59:59.000Z

385

Investigations of MACCS2 for LANL Dispersion Analysis  

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

Investigations of MACCS2 Investigations of MACCS2 Investigations of MACCS2 Investigations of MACCS2 for LANL Dispersion Analysis p y DOE Workshop Germantown, MD Raymond F. Sartor, Ph.D. Safety Basis Technical Services June 5-6, 2012 Safety Basis - Technical Services Los Alamos National Laboratory Operated by Los Alamos National Security, LLC for NNSA U N C L A S S I F I E D Basic Equation for Ground-Level Release Basic Equation for Ground-Level Release                                                

386

Methods and apparatus for controlling dispersions of nanoparticles  

DOE Patents [OSTI]

Electrically reconfigurable metamaterial with spatially varied refractive index is proposed for applications such as optical devices and lenses. The apparatus and method comprises a metamaterial in which the refractive indices are modified in space and time by applying one or more electric fields. The metamaterials are electrically controllable and reconfigurable, and consist of metal (gold, silver, etc.) particles of different shapes, such as rods, with dimension much smaller than the wavelength of light, dispersed in a dielectric medium. The metamaterial is controlled by applying a non-uniform electric field that causes two effects: (1) It aligns the metallic anisometric particles with respect to the direction of the applied electric field and (2) It redistributes particles in space, making their local concentration position dependent.

Lavrentovich, Oleg D; Golovin, Andrii B

2014-10-21T23:59:59.000Z

387

Measurement of Propagation Time Dispersion in a Scintillator  

E-Print Network [OSTI]

One contribution to the time resolution of a scintillation detector is the signal time spread due to path length variations of the detected photons from a point source. In an experimental study a rectangular scintillator was excited by means of a fast pulsed ultraviolet laser at different positions along its longitudinal axis. Timing measurements with a photomultiplier tube in a detection plane displaced from the scintillator end face showed a correlation between signal time and tube position indicating only a small distortion of photon angles during transmission. The data is in good agreement with a Monte Carlo simulation used to compute the average photon angle with respect to the detection plane and the average propagation time. Limitations on timing performance that arise from propagation time dispersion are expected for long and thin scintillators used in future particle identification systems.

P. Achenbach; C. Ayerbe Gayoso; J. Bernauer; R. Bhm; M. O. Distler; L. Doria; J. Friedrich; H. Merkel; U. Mller; L. Nungesser; J. Pochodzalla; S. Snchez Majos; S. Schlimme; Th. Walcher; M. Weinriefer

2007-02-25T23:59:59.000Z

388

Lifetime of nuclear velocity dispersion drops in barred galaxies  

E-Print Network [OSTI]

We have made hydro/N-body simulations with and without star formation to shed some light on the conditions under which a central kinematically cold stellar component (characterized by a velocity dispersion drop or \\sigma-drop) could be created in a hot medium (e.g. a bulge) and survive enough time to be observed. We found that the timescale for a \\sigma-drop formation could be short (less than 500 Myr) whereas its lifetime could be long (more than 1 Gyr) provided that the central region is continuously or regularly fed by fresh gas which leads to a continuous star formation activity. Star formation in the central region, even at a low rate as 1M_{sol} yr^{-1}, is mandatory to sustain a permanent \\sigma-drop by replacing heated particles by new low-\\sigma ones. We moreover show that as soon as star formation is switched off, the \\sigma-drop begins to disappear.

Herve Wozniak; Nicolas Champavert

2006-03-29T23:59:59.000Z

389

Dispersion relations of mesons in symmetric nuclear matter  

E-Print Network [OSTI]

We calculate dispersion relations and propagators for the $\\sigma$, $\\omega$, $\\pi$, $\\rho$, $\\delta$, $\\eta$ and $a_1$ mesons in relativistic, dense, hot, symmetric nuclear matter. In addition to the usual mixing of the $\\sigma-\\omega$ system, we obtain mixing of the $\\delta$ with the longitudinal $\\rho$ mode and of the tranverse $\\rho$ with the transverse $a_1$ mode. Finally, the component of the $a_1$ polarization along the transferred momentum modifies the in-medium pion propagator in a way similar to the Migdal contact interaction, but with the opposite sign. The spurious pion condensate as well as the additional contribution from the $a_1$ meson are removed by a contact term. We compare two ways of implementing contact term subtraction.

L. Mornas

2001-07-02T23:59:59.000Z

390

RHIC | Relativistic Heavy Ion Collider  

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

Relativistic Heavy Ion Collider Relativistic Heavy Ion Collider Photo of LINAC The Relativistic Heavy Ion Collider (RHIC) is a world-class particle accelerator at Brookhaven National Laboratory where physicists are exploring the most fundamental forces and properties of matter and the early universe. RHIC accelerates beams of particles (e.g., the nuclei of heavy atoms such as gold) to nearly the speed of light, and smashes them together to recreate a state of matter thought to have existed immediately after the Big Bang some 13.8 billion years ago. STAR and PHENIX, two large detectors located around the 2.4-mile-circumference accelerator, take "snapshots" of these collisions to reveal a glimpse of the basic constituents of visible matter, quarks and gluons. Understanding matter at

391

RHIC | Relativistic Heavy Ion Collider  

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

Brookhaven National Laboratory Brookhaven National Laboratory search U.S. Department of Energy logo Home RHIC Science News Images Videos For Scientists Björn Schenke 490th Brookhaven Lecture, 12/18 Join Björn Schenke of Brookhaven Lab's Physics Department for the 490th Brookhaven Lecture, titled 'The Shape and Flow of Heavy Ion Collisions,' on Wednesday, Dec. 18, at 4 p.m. in Berkner Hall. droplets Tiny Drops of Hot Quark Soup-How Small Can They Be? New analyses indicate that collisions of small particles with large gold nuclei at the Relativistic Heavy Ion Collider may be serving up miniscule servings of hot quark-gluon plasma. RHIC Physics RHIC is the first machine in the world capable of colliding ions as heavy as gold. The Spin Puzzle RHIC is the world's only machine capable of colliding beams of polarized

392

Heat transport through ion crystals  

E-Print Network [OSTI]

We study the thermodynamical properties of crystals of trapped ions which are laser cooled to two different temperatures in two separate regions. We show that these properties strongly depend on the structure of the ion crystal. Such structure can be changed by varying the trap parameters and undergoes a series of phase transitions from linear to zig-zag or helicoidal configurations. Thus, we show that these systems are ideal candidates to observe and control the transition from anomalous to normal heat transport. All structures behave as `heat superconductors', with a thermal conductivity increasing linearly with system size and a vanishing thermal gradient inside the system. However, zig-zag and helicoidal crystals turn out to be hyper sensitive to disorder having a linear temperature profile and a length independent conductivity. Interestingly, disordered 2D ion crystals are heat insulators. Sensitivity to disorder is much smaller in the 1D case.

Nahuel Freitas; Esteban Martinez; Juan Pablo Paz

2013-12-23T23:59:59.000Z

393

Quantum reservoirs with ion chains  

E-Print Network [OSTI]

Ion chains are promising platforms for studying and simulating quantum reservoirs. One interesting feature is that their vibrational modes can mediate entanglement between two objects which are coupled through the vibrational modes of the chain. In this work we analyse entanglement between the transverse vibrations of two heavy impurity defects embedded in an ion chain, which is generated by the coupling with the chain vibrations. We verify general scaling properties of the defects dynamics and demonstrate that entanglement between the defects can be a stationary feature of these dynamics. We then analyse entanglement in chains composed of tens of ions and propose a measurement scheme which allows one to verify the existence of the predicted entangled state.

B. G. Taketani; T. Fogarty; E. Kajari; Th. Busch; Giovanna Morigi

2014-02-06T23:59:59.000Z

394

Symbolic computation of solitons in the normal dispersion regime of inhomogeneous optical fibres  

SciTech Connect (OSTI)

A nonlinear Schroedinger equation with varying dispersion, nonlinearity and gain (or absorption) is studied for ultrashort optical pulses propagating in inhomogeneous optical fibres in the case of normal dispersion. Using the modified Hirota method and symbolic computation, the bilinear form and analytic soliton solution are derived. Stable bright and dark solitons are observed in the normal dispersion regime. A periodically varying soliton and compressed soliton without any fluctuation are obtained. Combined and kink-shaped solitons are observed. Possibly applicable soliton control techniques, which are used to design dispersion-managed systems, are proposed. The proposed techniques may find applications in soliton management communication links, soliton compression and soliton control. (solitons)

Liu Wenjun; Tain Bo; Li Min; Jiang Yan; Qu Qixing; Wang Pan; Sun Kun [School of Science, Beijing University of Posts and Telecommunications, Beijing (China)

2011-06-30T23:59:59.000Z

395

The Development of a Non-Equilibrium Dispersed Flow Film Boiling Heat Transfer Modeling Package.  

E-Print Network [OSTI]

??The dispersed flow film boiling (DFFB) heat transfer regime is important to several applications including cryogenics, rocket engines, steam generators, and in the safety analysis (more)

Meholic, Michael

2011-01-01T23:59:59.000Z

396

Extensional rheology of shear-thickening fumed silica nanoparticles dispersed in an aqueous polyethylene  

E-Print Network [OSTI]

polyethylene oxide solution Sunilkumar Khandavalli and Jonathan P. Rothsteina) Mechanical and Industrial rheology of fumed silica nanoparticles dispersed in an aqueous polyethylene oxide (PEO) solution

Rothstein, Jonathan

397

E-Print Network 3.0 - altered dispersion relations Sample Search...  

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

in mean dispersal distances were not linearly related to the degree of plant... (Westcott and Graham 2000). Although different behaviors can alter seed ... Source: Carlo,...

398

Anisotropic Ordering in Nanoclay Dispersions Induced by WaterAir Interface  

Science Journals Connector (OSTI)

This chapter reports the kinetics of interface induced generation and propagation of arrested phase caused anisotropy in Laponite dispersions probed by depolarized light scattering experiments. Growth of aniso...

Ravi Kumar Pujala

2014-01-01T23:59:59.000Z

399

E-Print Network 3.0 - ancient oceanic dispersal Sample Search...  

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

Summary: region. Key words. Biogeography, cytochrome b, dispersal, mitochondrial DNA, ocean currents, population... Ocean basin was largely the same as it is today. Thus, it is...

400

Highly Dispersed and Nano-sized Pt-based Electrocatalysts for Low-Temperature Fuel Cells  

Science Journals Connector (OSTI)

The present article reviews the development of highly dispersed and nano-sized Pt- ... the addition of metal oxide to Pt/C electrocatalyst as cathode material.

Dong-Ha Lim; Weon-Doo Lee; Ho-In Lee

2008-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "ion dispersion thermochronometry" 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

Plume Rise and Dispersion of Emissions from Low Level Buoyant Sources in Urban Areas  

E-Print Network [OSTI]

on dispersion from a distributed generator in a real urbanimpact of Distributed Power Generators on the concentrationsknown as distributed power generators ( DGs). From January

Pournazeri, Sam

2012-01-01T23:59:59.000Z

402

Modulating dispersion properties of low index photonic crystal structures using microfluidics  

Science Journals Connector (OSTI)

We present a technique for manipulating the dispersive properties of low index periodic structures using microfluidic materials that fill the lattice with various fluids of different...

Sharkawy, Ahmed; Pustai, David; Shi, Shouyuan; Prather, Dennis; McBride, Sterling; Zanzucchi, Peter

2005-01-01T23:59:59.000Z

403

Holographic manipulation of nanoparticle distribution morphology in nanoparticle-dispersed photopolymers  

Science Journals Connector (OSTI)

We report on experimental verification of mass transfer of nanoparticles during holographic recording in nanoparticle-dispersed photopolymers. Through direct observations of the...

Tomita, Yasuo; Suzuki, Naoaki; Chikama, Katsumi

2005-01-01T23:59:59.000Z

404

E-Print Network 3.0 - amplified dispersive fourier Sample Search...  

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

Collection: Engineering ; Materials Science 33 Broad band p-Ge optical amplifier of terahertz radiation A. V. Muravjov and S. H. Withers Summary: is undistorted by dispersion...

405

E-Print Network 3.0 - atmospheric dispersion coefficient Sample...  

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

spill countermeasures to reduce the adverse effects of spilled oil on the environment. Dispersants Source: NOAA Marine Fisheries Review; National Oceanic and Atmospheric...

406

E-Print Network 3.0 - ancient hominin dispersals Sample Search...  

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

earliest Acheulean stone tool technology, and the first dispersal of hominins out of Africa. Two sites... - ularly climate, affect the evolution of our hominin ancestors and...

407

E-Print Network 3.0 - america geographic dispersal Sample Search...  

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

over Summary: dictated by multiple episodes of vicariance and dispersal madagascar africa eurasia N & S america india... and abundances? Recognized by Darwin and Wallace...

408

Ion Sources for High Energy Ion Implantation at BNL | U.S. DOE...  

Office of Science (SC) Website

Ion Sources for High Energy Ion Implantation at BNL Nuclear Physics (NP) NP Home About Research Facilities Science Highlights Benefits of NP Applications of Nuclear Science...

409

Ion exchange purification of scandium  

DOE Patents [OSTI]

An improvement in purification of scandium through ion exchange chromatography is disclosed in which the oxidation potential of the eluting solution is altered by the addition of potassium chlorate or ammonium chloride so that removal of contaminants is encouraged. The temperature, pH and concentration of the eluent HEDTA are controlled in order to maintain the scandium in the column while minimizing dilution of the scandium band. Recovery of scandium is improved by pumping dilute scandium over the column prior to stripping the scandium and precipitation. This eliminates the HEDTA ion and other monovalent cations contaminating the scandium band. This method maximizes recovery of scandium while maintaining purity. 2 figs.

Herchenroeder, L.A.; Burkholder, H.R.

1990-10-23T23:59:59.000Z

410

Relating to monitoring ion sources  

DOE Patents [OSTI]

The apparatus and method provide techniques for monitoring the position on alpha contamination in or on items or locations. The technique is particularly applicable to pipes, conduits and other locations to which access is difficult. The technique uses indirect monitoring of alpha emissions by detecting ions generated by the alpha emissions. The medium containing the ions is moved in a controlled manner frog in proximity with the item or location to the detecting unit and the signals achieved over time are used to generate alpha source position information.

Orr, Christopher Henry (Calderbridge, GB); Luff, Craig Janson (Calderbridge, GB); Dockray, Thomas (Calderbridge, GB); Macarthur, Duncan Whittemore (Los Alamos, NM); Bounds, John Alan (Los Alamos, NM)

2002-01-01T23:59:59.000Z

411

Pionic Fusion of Heavy Ions  

Science Journals Connector (OSTI)

We report the first experimental observation of the pionic fusion of two heavy ions. The 12C(12C,24Mg)?0 and 12C(12C,24Na)?+ cross sections have been measured to be 20838 and 18284 pb, respectively, at Ecm=137MeV. This cross section for heavy-ion pion production, at an energy just 6 MeV above the absolute energy-conservation limit, constrains possible production mechanisms to incorporate the kinetic energy of the entire projectile-target system as well as the binding energy gained in fusion.

D. Horn; G. C. Ball; D. R. Bowman; W. G. Davies; D. Fox; A. Galindo-Uribarri; A. C. Hayes; G. Savard; L. Beaulieu; Y. Larochelle; C. St-Pierre

1996-09-16T23:59:59.000Z

412

Grafted methylenediphosphonate ion exchange resins  

DOE Patents [OSTI]

An ion exchange resin is disclosed that is comprised of an insoluble copolymer onto which are grafted pendent groups that provide 1.0 to about 10 mmol/g dry weight phosphorous. The pendent groups have the formula ##STR1## wherein R is hydrogen, a cation or mixtures thereof; and R.sup.1 is hydrogen or an C.sub.1 -C.sub.2 alkyl group. The resin also contains zero to about 5 mmol/g dry weight of pendent aromatic sulfonate groups. Processes for making and using an ion exchange resin are also disclosed.

Trochimcznk, Andrzej W. (Knoxbille, TN); Gatrone, Ralph C. (Plymouth, PA); Alexandratos, Spiro (Knoxville, TN); Horwitz, E. Philip (Naperville, IL)

1997-01-01T23:59:59.000Z

413

Grafted methylenediphosphonate ion exchange resins  

DOE Patents [OSTI]

An ion exchange resin is disclosed that is comprised of an insoluble copolymer onto which are grafted pendent groups that provide 1.0 to about 10 mmol/g dry weight phosphorous. The pendent groups have the formula ##STR1## wherein R is hydrogen, a cation or mixtures thereof; and R.sup.1 is hydrogen or an C.sub.1 -C.sub.2 alkyl group. The resin also contains zero to about 5 mmol/g dry weight of pendent aromatic sulfonate groups. Processes for making and using an ion exchange-resin are also disclosed.

Trochimcznk, Andrzej W. (Knoxville, TN); Gatrone, Ralph C. (Plymouth, PA); Alexandratos, Spiro (Knoxville, TN); Horwitz, E. Philip (Naperville, IL)

1998-01-27T23:59:59.000Z

414

Central collisions of heavy ions  

SciTech Connect (OSTI)

This report describes the activities of the Heavy Ion Physics Group at the University of California, Riverside from October 1, 1990 to September 30, 1991. During this period, our program focuses on particle production at AGS energies, and correlation studies at the Bevalac in nucleus central collisions. We participated in the preparation of letters of intent for two RHIC experiments -- the OASIS proposal and the Di-Muon proposal -- and worked on two RHIC R D efforts -- a silicon strip detector project and a muon-identifier project. A small fraction of time was also devoted to physics programs outside the realm of heavy ion reactions by several individuals.

Fung, Sun-yiu.

1991-10-01T23:59:59.000Z

415

Ion mobility spectrometer with virtual aperture grid  

DOE Patents [OSTI]

An ion mobility spectrometer does not require a physical aperture grid to prevent premature ion detector response. The last electrodes adjacent to the ion collector (typically the last four or five) have an electrode pitch that is less than the width of the ion swarm and each of the adjacent electrodes is connected to a source of free charge, thereby providing a virtual aperture grid at the end of the drift region that shields the ion collector from the mirror current of the approaching ion swarm. The virtual aperture grid is less complex in assembly and function and is less sensitive to vibrations than the physical aperture grid.

Pfeifer, Kent B. (Los Lunas, NM); Rumpf, Arthur N. (Albuquerque, NM)

2010-11-23T23:59:59.000Z

416

Stored-Ion Collisional Relaxation to Equilibrium  

E-Print Network [OSTI]

is the ion mass in amu, T is the temperature in K, p is the ion density in cm and lnA is a shielding parameter. The simulations by Kho show that the mean ion energy is closely ap- proached in about one time constant, and that the high- energy tail... is the ion mass in amu, T is the temperature in K, p is the ion density in cm and lnA is a shielding parameter. The simulations by Kho show that the mean ion energy is closely ap- proached in about one time constant, and that the high- energy tail...

Church, David A.

1988-01-01T23:59:59.000Z

417

In situ ion exchange preparation of Pt/carbon nanotubes electrode: Effect of two-step oxidation of carbon nanotubes  

SciTech Connect (OSTI)

Multi-walled carbon nanotubes (MWNTs) supported Pt electrode is prepared by in-situ ion exchange method. X-ray photoelectron spectroscopy (XPS) confirms that compared with the only electrochemical oxidation or chemical oxidation treatment, more carboxylic acid groups are produced on the surface of MWNTs treated by dual-oxidation, which involves both electrochemical oxidation and chemical oxidation. Transmission electron microscopy (TEM) shows that Pt nanoparticles deposited via in-situ ion exchange are highly dispersed on the MWNTs surface. Electrochemical measurements show that the resultant Pt/MWNTs electrode treated by dual-oxidation exhibits the largest electrochemical surface area and the highest activity for oxygen reduction reaction (ORR) among the investigated electrodes. This can be attributed to the fact that dual-oxidation treatment produces more carboxylic acid groups at the electroactive sites on MWNTs surface, which results in loading more Pt nanoparticles in the following ion exchange process.

Zhang, Sheng; Shao, Yuyan; Gao, Yunzhi; Chen, Guangyu; Lin, Yuehe; Yin, Geping

2011-12-01T23:59:59.000Z

418

High energy ions and energetic plasma irradiation effects on aluminum in a Filippov-type plasma focus  

Science Journals Connector (OSTI)

High energy ions and energetic plasma irradiation of aluminum cathode inserts have been accomplished in nitrogen and argon filled plasma focus device. The Filippov-type plasma focus facility, Dena, with 288?F capacitor bank and charging voltage of 25kV (90kJ maximum storage energy) was first optimized for strong ion beam generation for nitrogen and argon gases by maximizing hard X-ray emission efficiency. X-ray diffraction analysis as well as scanning electron microscopy along with energy dispersive X-ray spectroscopy carried out to study the structural, morphological and compositional profile of the treated samples. Change in preferred orientation, emergence of meta-stable phases, generation of copper micro-droplets, and production of cracks across the sample are demonstrated and discussed. The micro-hardness measurements in Vickers scale reveal that after ion irradiation, the surface hardness of samples is reduced.

M.V. Roshan; R.S. Rawat; A.R. Babazadeh; M. Emami; S.M. Sadat Kiai; R. Verma; J.J. Lin; A.R. Talebitaher; P. Lee; S.V. Springham

2008-01-01T23:59:59.000Z

419

A 10 GHz electron-cyclotron-resonance (ECR) ion source for ion-electron and ion-atom collision studies  

Science Journals Connector (OSTI)

In order to extend our investigations in the field of electronion collision studies involving ions in high charge states, we decided to build a newly designed 10 GHz Electron-Cyclotron-Resonance Ion Source. The n...

M. Liehr; M. Schlapp; E. Salzborn

1991-01-01T23:59:59.000Z

420

Surface-Driven Sodium Ion Energy Storage in Nanocellular Carbon...  

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

Surface-Driven Sodium Ion Energy Storage in Nanocellular Carbon Foams. Surface-Driven Sodium Ion Energy Storage in Nanocellular Carbon Foams. Abstract: Sodium ion (Na+) batteries...

Note: This page contains sample records for the topic "ion dispersion thermochronometry" 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

Monte Carlo Modeling of Ion Beam Induced Secondary Electrons.  

E-Print Network [OSTI]

??Modeling ion beam induced secondary electron (iSE) production within matter for simulating ion beam induced images has been studied. When the complex nature of ion (more)

Huh, Uk

2014-01-01T23:59:59.000Z

422

Engineering embedded metal nanoparticles with ion beam technology  

E-Print Network [OSTI]

2002) Engineering embedded metal nanoparticles with ion beam3 Engineering embedded metal nanoparticles with ion beamcompara- Engineering embedded metal nanoparticles with ion

Ren, Feng; Xiao, Xiang Heng; Cai, Guang Xu; Wang, Jian Bo; Jiang, Chang Zhong

2009-01-01T23:59:59.000Z

423

Are Cluster Ion Analysis Beams Good Choices for Hydrogen Depth...  

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

Cluster Ion Analysis Beams Good Choices for Hydrogen Depth Profiling Using Time-of-Flight Secondary Ion Mass Spectrometry? Are Cluster Ion Analysis Beams Good Choices for Hydrogen...

424

Structural Modification of Nanocrystalline Ceria by Ion Beams...  

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

Modification of Nanocrystalline Ceria by Ion Beams. Structural Modification of Nanocrystalline Ceria by Ion Beams. Abstract: Using energetic ions, we have demonstrated effective...

425

Conductivity Histories Measured in Shock-Dispersed-Fuel Explosion Clouds  

SciTech Connect (OSTI)

The notion of high ion and electron concentrations in the detonation of aluminized explosive mixtures has aroused some interest in electro-magnetic effects that the SDF charges might generate when detonated. Beside the scientific aspects at least two questions appear to be of practical interest: (1) Does the detonation of an SDF charge create electro-magnetic disturbances strong enough to affect the operation of electrical infrastructure in for example a tunnel system? (2) Does the detonation of an SDF charge in a tunnel system create an electromagnetic signature that relays information of the charge performance to the outside environment?

Kuhl, A L

2010-04-01T23:59:59.000Z

426

Ion Bernstein waves in a plasma with a kappa velocity distribution  

SciTech Connect (OSTI)

Using a Vlasov-Poisson model, a numerical investigation of the dispersion relation for ion Bernstein waves in a kappa-distributed plasma has been carried out. The dispersion relation is found to depend significantly on the spectral index of the ions, ?{sub i}, the parameter whose smallness is a measure of the departure from thermal equilibrium of the distribution function. Over all cyclotron harmonics, the typical Bernstein wave curves are shifted to higher wavenumbers (k) if ?{sub i} is reduced. For waves whose frequency lies above the lower hybrid frequency, ?{sub LH}, an increasing excess of superthermal particles (decreasing ?{sub i}) reduces the frequency, ?{sub peak}, of the characteristic peak at which the group velocity vanishes, while the associated k{sub peak} is increased. As the ratio of ion plasma to cyclotron frequency (?{sub pi}/?{sub ci}) is increased, the fall-off of ? at large k is smaller for lower ?{sub i} and curves are shifted towards larger wavenumbers. In the lower hybrid frequency band and harmonic bands above it, the frequency in a low-?{sub i} plasma spans only a part of the intraharmonic space, unlike the Maxwellian case, thus exhibiting considerably less coupling between adjacent bands for low ?{sub i}. It is suggested that the presence of the ensuing stopbands may be a useful diagnostic for the velocity distribution characteristics. The model is applied to the Earth's plasma sheet boundary layer in which waves propagating perpendicularly to the ambient magnetic field at frequencies between harmonics of the ion cyclotron frequency are frequently observed.

Nsengiyumva, F.; Mace, R. L.; Hellberg, M. A. [School of Chemistry and Physics, University of KwaZulu-Natal, Durban 4000 (South Africa)] [School of Chemistry and Physics, University of KwaZulu-Natal, Durban 4000 (South Africa)

2013-10-15T23:59:59.000Z

427

Morphology of Ion Exchange Membranes  

Science Journals Connector (OSTI)

......the HjO,- treatment of the ion exchange...and rinsed with water. After drying...Determined in sea water at 25 C by electrodialysis. Fig. 2. Neosepta...with deionized water, treated with...prepared by the treatment of the cation......

Yoshikazu HORI; Toru NAKATANI; Yukio MIZUTANI

1986-10-01T23:59:59.000Z

428

6 Ion Transport, Osmoregulation, and  

E-Print Network [OSTI]

177 6 Ion Transport, Osmoregulation, and Acid­Base Balance W.S. Marshall and M. Grosell CONTENTS I)............................................................................182 5. Skin and Opercular Membrane..................................................................................................183 2. Sea-Water Transport Mode -- Na+,K+-ATPase and Na+,K+, 2Cl­ Co-transport

Grosell, Martin

429

Fusion and Heavy Ion Reactions  

Science Journals Connector (OSTI)

......February 2004 research-article Articles Fusion and Heavy Ion Reactions David M. Brink...useful for understanding of sub-barrier fusion processes. The Christensen-Winther...potentials like the CW interaction give good fusion cross-sections near and for a few MeV......

David M. Brink

2004-02-01T23:59:59.000Z

430

Ion-induced nuclear radiotherapy  

DOE Patents [OSTI]

Ion-induced Nuclear Radiotherapy (INRT) is a technique for conducting radiosurgery and radiotherapy with a very high degree of control over the spatial extent of the irradiated volume and the delivered dose. Based upon the concept that low energy, ion induced atomic and nuclear reactions can be used to produce highly energetic reaction products at the site of a tumor, the INRT technique is implemented through the use of a conduit-needle or tube which conducts a low energy ion beam to a position above or within the intended treatment area. At the end of the conduit-needle or tube is a specially fabricated target which, only when struck by the ion beam, acts as a source of energetic radiation products. The inherent limitations in the energy, and therefore range, of the resulting reaction products limits the spatial extent of irradiation to a pre-defined volume about the point of reaction. Furthermore, since no damage is done to tissue outside this irradiated volume, the delivered dose may be made arbitrarily large. INRT may be used both as a point-source of radiation at the site of a small tumor, or as a topical bath of radiation to broad areas of diseased tissue.

Horn, Kevin M. (Albuquerque, NM); Doyle, Barney L. (Albuquerque, NM)

1996-01-01T23:59:59.000Z

431

Ion-induced nuclear radiotherapy  

DOE Patents [OSTI]

Ion-induced Nuclear Radiotherapy (INRT) is a technique for conducting radiosurgery and radiotherapy with a very high degree of control over the spatial extent of the irradiated volume and the delivered dose. Based upon the concept that low energy, ion induced atomic and nuclear reactions can be used to produce highly energetic reaction products at the site of a tumor, the INRT technique is implemented through the use of a conduit-needle or tube which conducts a low energy ion beam to a position above or within the intended treatment area. At the end of the conduit-needle or tube is a specially fabricated target which, only when struck by the ion beam, acts as a source of energetic radiation products. The inherent limitations in the energy, and therefore range, of the resulting reaction products limits the spatial extent of irradiation to a pre-defined volume about the point of reaction. Furthermore, since no damage is done to tissue outside this irradiated volume, the delivered dose may be made arbitrarily large. INRT may be used both as a point-source of radiation at the site of a small tumor, or as a topical bath of radiation to broad areas of diseased tissue. 25 figs.

Horn, K.M.; Doyle, B.L.

1996-08-20T23:59:59.000Z

432

Stopping of Ions in Nanomaterials  

SciTech Connect (OSTI)

The stopping of ions in solids is due to the energy loss as a result of the resistance to ion passage of the electronic and ionic nuclei in the material. When an ion penetrates a solid, it experiences a number of collisions. Energetic charged particles interact with both electrons and atoms in materials. Kinetic energy transfers to atoms can result in displacement of atoms from their original sites; thereby forming atomic-scale defects in the structure. Energy transfers to the target electrons (either bound or free) produces electron-hole pairs that can result in charging of pre-existing defects, localized electronic excitations, rupture of covalent and ionic bonds, enhanced defect and atomic diffusion, increased free energy, changes in phase transformation dynamics, as well as formation of atomic-scale defects. Such atomic collisions and ionization processes can modify the physical and chemical behavior of nanomaterials. This box will discuss irradiation-induced defect, address nanostructure engineering and radiation effects in nanomaterials, as well as the scientific challenges of ion-solid interactions.

Zhang, Yanwen; Weber, William J.

2010-01-01T23:59:59.000Z

433

Nonlinear ion concentration polarization : fundamentals and applications  

E-Print Network [OSTI]

Ion exchange membrane (IEM) is a functional material that has a permselectivity of ions. Two types of IEMs - anion exchange membrane (AEM) and cation exchange membrane (CEM) - are used in a variety of electrochemical ...

Kwak, Rhokyun

2013-01-01T23:59:59.000Z

434

On a cryogenic noble gas ion catcher  

E-Print Network [OSTI]

In-situ purification of the gas used as stopping medium in a noble gas ion catcher by operating the device at low temperatures of 60 to 150 K was investigated. Alpha-decay recoil ions from a 223Ra source served as energetic probes. The combined ion survival and transport efficiencies for 219Rn ions saturated below about 90 K, reaching 28.7(17) % in helium, 22.1(13) % in neon, and 17.0(10) % in argon. These values may well reflect the charge exchange and stripping cross sections during the slowing down of the ions, and thus represent a fundamental upper limit for the efficiency of noble gas ion catcher devices. We suggest the cryogenic noble gas ion catcher as a technically simpler alternative to the ultra-high purity noble gas ion catcher operating at room temperature.

P. Dendooven; S. Purushothaman; K. Gloos

2005-10-20T23:59:59.000Z

435

The Electron Beam Ion Source (EBIS)  

ScienceCinema (OSTI)

Brookhaven National Lab has successfully developed a new pre-injector system, called the Electron Beam Ion Source, for the Relativistic Heavy Ion Collider (RHIC) and NASA Space Radiation Laboratory science programs. The first of several planned improvemen

Brookhaven Lab

2010-01-08T23:59:59.000Z

436

Ion acceleration in a plasma focus  

Science Journals Connector (OSTI)

The electric and magnetic fields associated with anomalous diffusion to the axis of a linear plasma discharge are used to compute representative ion trajectories. Substantial axial acceleration of the ions is demonstrated.

S. Peter Gary

1974-01-01T23:59:59.000Z

437

The Electron Beam Ion Source (EBIS)  

SciTech Connect (OSTI)

Brookhaven National Lab has successfully developed a new pre-injector system, called the Electron Beam Ion Source, for the Relativistic Heavy Ion Collider (RHIC) and NASA Space Radiation Laboratory science programs. The first of several planned improvemen

Brookhaven Lab

2009-06-09T23:59:59.000Z

438

MIS-1 electron-beam ion source  

Science Journals Connector (OSTI)

The Institute of Nuclear Physics (INP) has developed and produced electron-beam multiply charged ion sources. These ion sources give the electron beam its high density in the ionization...3 A/cm2.... They produce...

V. G. Abdulmanov; N. S. Dikansky

2010-12-01T23:59:59.000Z

439

Laboratory measurement of hydrodynamic saline dispersion within a micro-fracture network induced in granite  

E-Print Network [OSTI]

Laboratory measurement of hydrodynamic saline dispersion within a micro-fracture network induced plug of Ailsa Craig micro-granite by thermal stressing, to produce an isotropic network of fractures number­dispersion relationship for the micro-fracture network is very similar to that predicted for other

440

The Role of Dispersion in Radionuclide Transport - Data and Modeling Requirements: Revision No. 1  

SciTech Connect (OSTI)

This document is the collaborative effort of the members of an ad hoc subcommittee of the Underground Test Area Project Technical Working Group. This subcommittee was to answer questions and concerns raised by the Nevada Division of Environmental Protection to the U.S. Department of Energy, National Nuclear Security Administration Nevada Site Office, regarding Pahute Mesa Corrective Action Units (CAUs) 101 and 102. The document attempts to synthesize the combined comments made by each member of this subcommittee into insights made in the role of dispersion in radionuclide transport data and modeling. Dispersion is one of many processes that control the concentration of radionuclides in groundwater beneath the Nevada Test Site where CAUs 101 and 102 are located. In order to understand the role of dispersion in radionuclide transport, there is a critical need for CAU- or site-specific data related to transport parameters which is currently lacking, particularly in the case of Western a nd Central Pahute Mesa. The purpose of this technical basis document is to: (1) define dispersion and its role in contaminant transport, (2) present a synopsis of field-scale dispersion measurements, (3) provide a literature review of theories to explain field-scale dispersion, (4) suggest approaches to account for dispersion in CAU-scale radionuclide modeling, and (5) to determine if additional dispersion measurements should be made at this time.

Stoller-Navarro Joint Venture

2004-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "ion dispersion thermochronometry" 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

Entry Dispersion Analysis for the HAYABUSA Spacecraft using Ground-Based Optical Observation  

Science Journals Connector (OSTI)

......backup plans for predicting the landing location were prepared. This...trouble. We also evaluated the landing dispersion of HAYABUSA only...in 1999 to collect dust from comet Wild-2 Desai et al. (2008...view). Figure 9 depicts the landing dispersion ellipse for cases......

Tomohiro Yamaguchi; Makoto Yoshikawa; Masafumi Yagi; David J. Tholen

2011-10-25T23:59:59.000Z

442

Dispersed Repetitive DNA Has Spread to New Genomes Since Polyploid Formation in Cotton  

E-Print Network [OSTI]

Dispersed Repetitive DNA Has Spread to New Genomes Since Polyploid Formation in Cotton Xin recently formed polyploid, cotton (Gossypium barbadense L.; AD genome), 83 non-cross-hybridizing DNA clones tetraploid cotton. In tetraploid cotton, FISH analysis showed that some A-genome dispersed repeats appear

Wendel, Jonathan F.

443

Price Dispersion in the Housing Market: The Role of Bargaining and Search Costs  

E-Print Network [OSTI]

Price Dispersion in the Housing Market: The Role of Bargaining and Search Costs Gaetano Lisi a basic fact of housing markets: price dispersion. The variance in house prices is basically due to both the deal. Furthermore, the house price is substantially determined by bargaining between the parties

Boyer, Edmond

444

Page 1 of 19 Title: Dispersion diagrams of waves in the simulated solar chromosphere  

E-Print Network [OSTI]

Page 1 of 19 Title: Dispersion diagrams of waves in the simulated solar chromosphere Authors and affiliations: Dove, C., Zita, E.J., Bogdan, T.J., 1) Introduction: What role do MHD waves play in the dynamics. And the only way to absolutely test theory is by observation. By generating dispersion diagrams from simulation

Zita, E.J.

445

Dispersion measurement as a method of quantifying geologic characterization and defining reservoir heterogeneity. Final report  

SciTech Connect (OSTI)

The main objective of this research project is to investigate dispersion as a method of quantifying geological characterization and defining reservoir heterogeneity in order to enhance crude oil recovery. The dispersion of flow of a reservoir rock (dispersion coefficient and dispersivity) was identified as one of the physical properties of a reservoir rock by measuring the mixing of two miscible fluids, one displacing the other in a porous medium. A rock was 100% saturated with a resident fluid and displaced by a miscible fluid of equal viscosity and equal density. Some specific experiments were performed with unequal densities. Produced fluid was analyzed by refractometer, nuclear reaction, electrical conductivity and X-ray scan. Several physical and flow characteristics were measured on the sand rock sample in order to establish correlations with the measured dispersion property. Absolute permeability, effective porosity, relative permeability, capillary pressure, the heterogeneity factor and electrical conductivity were used to better understand the flow system. Linear, transverse, 2-D and 3-D dispersions were measured and used to characterize the rock heterogeneity of the flow system. A new system of measuring dispersion was developed using a gas displacing gas system in a porous medium. An attempt was also made to determine the dispersion property of an actual reservoir from present day well log data on a producing well. 275 refs., 102 figs., 17 tabs.

Menzie, D.E.

1995-05-01T23:59:59.000Z

446

Ni-dispersed fullerenes: Hydrogen storage and desorption properties Weon Ho Shin and Seong Ho Yang  

E-Print Network [OSTI]

Ni-dispersed fullerenes: Hydrogen storage and desorption properties Weon Ho Shin and Seong Ho Yang could be viable alternatives to reversible hydrogen storage. It is demonstrated that a single Ni coated-dispersed fullerenes are considered to be the novel hydrogen storage media capable of storing 6.8 wt % H2, thus

Goddard III, William A.

447

Piston Dispersive Shock Wave Problem M. A. Hoefer,1,* M. J. Ablowitz,2  

E-Print Network [OSTI]

Piston Dispersive Shock Wave Problem M. A. Hoefer,1,* M. J. Ablowitz,2 and P. Engels3 1 National University, Pullman, Washington 99164, USA (Received 24 October 2007; published 28 February 2008) The piston solutions are calculated for a piston (step potential) moving with uniform speed into a dispersive fluid

Hoefer, Mark

448

Participatory Sensing in Commerce: Using Mobile Camera Phones to Track Market Price Dispersion  

E-Print Network [OSTI]

-of-concept participatory mobile camera-phone sensing systems that we have built: (1) automating fuel price collectionParticipatory Sensing in Commerce: Using Mobile Camera Phones to Track Market Price Dispersion In economics, price dispersion refers to the price difference of a homogeneous good across different vendors

Bulusu, Nirupama

449

Population Ecology at the Range Edge Survival and Dispersal of a High-Density Lepidopteran  

E-Print Network [OSTI]

Population Ecology at the Range Edge Survival and Dispersal of a High-Density Lepidopteran Population Cecilia Ronnås Faculty of Natural Resources and Agricultural Sciences Department of Ecology Service/Repro, Uppsala 2011 #12;Population Ecology at the Range Edge. Survival and Dispersal of a High

450

THE DISPERSIVE EFFECT OF SODIUM HEXAMETAPHOSPHATE ON KAOLINITE IN SALINE WATER  

Science Journals Connector (OSTI)

...MgCl2. In the presence of HMP, the dispersant effectively rendered the surfaces of...provide extra adsorption sites for the dispersant, because the zeta potentials of kaolinite...bivalent cations. Journal of Inorganic and Nuclear Chemistry , 36 , 1605-1609. Lagaly...

Mark Ma

451

Nuclear magnetic relaxation dispersion investigations1 of water retention mechanism by cellulose ethers in mortars2  

E-Print Network [OSTI]

Nuclear magnetic relaxation dispersion investigations1 of water retention mechanism by cellulose : 10.1016/j.cemconres.2012.06.002 #12;2 ABSTRACT22 23 We show how nuclear magnetic spin-lattice relaxation dispersion of protons-water24 (NMRD) can be used to elucidate the effect of cellulose ethers

Boyer, Edmond

452

An Algorithm for ODES from Atmospheric Dispersion I. Ahmad and M. Berzins  

E-Print Network [OSTI]

An Algorithm for ODES from Atmospheric Dispersion Problems. I. Ahmad and M. Berzins School of ordinary differential equations o.d.e.s, arising from atmospheric dispersion problems is considered to illustrate the performance of the method. 1 Introduction. The increasing level of air pollution makes it ever

Utah, University of

453

Monitoring of Landfill Leachate Dispersion Using Reflectance Spectroscopy and Ground-Penetrating Radar  

Science Journals Connector (OSTI)

Monitoring of Landfill Leachate Dispersion Using Reflectance Spectroscopy and Ground-Penetrating Radar ... The generation and dispersion of leachate from landfills are slow, unsteady, nonuniform, and sometimes discontinuous depending on the degree of compaction of the fill, seasonal changes in the water supply to the system, and changes in the capping and contaminant walls (2). ...

T. Splajt; G. Ferrier; L. E. Frostick

2003-08-12T23:59:59.000Z

454

Breeding Dispersal and Nesting Behavior of Burrowing Owls Following Experimental Nest Predation  

E-Print Network [OSTI]

Breeding Dispersal and Nesting Behavior of Burrowing Owls Following Experimental Nest Predation D, Corvallis 97331 ABSTRACT.--Nest predation is considered a primary factor affecting the life-history characteristics and particularly dispersal of many avian species. We tested the hypothesis that nest predation

Rosenberg, Daniel K.

455

Linear dispersion relation for the mirror instability in context of the gyrokinetic theory  

SciTech Connect (OSTI)

The linear dispersion relation for the mirror instability is discussed in context of the gyrokinetic theory. The objective is to provide a coherent view of different kinetic approaches used to derive the dispersion relation. The method based on gyrocenter phase space transformations is adopted in order to display the origin and ordering of various terms.

Porazik, Peter; Johnson, Jay R. [Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08542 (United States)] [Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08542 (United States)

2013-10-15T23:59:59.000Z

456

Coupling traffic models on networks and urban dispersion models for simulating sustainable  

E-Print Network [OSTI]

models for modeling and testing different traffic scenarios, in order to define the impact on air quality it with the urban dispersion model Sirane. Keywords: urban air quality, macroscopic traffic models, road networks, pollutant dispersion models, traffic emissions control. AMS subject classification: 35L65, 35L67, 60K30, 90B

Ceragioli, Francesca

457

Nile-RedNanoclay Hybrids: Red Emissive Optical Probes for Use in Aqueous Dispersion  

Science Journals Connector (OSTI)

Nile-RedNanoclay Hybrids: Red Emissive Optical Probes for Use in Aqueous Dispersion ... Water-dispersible and (bio)functionalizable nanoclays have a considerable potential as inexpensive carriers for organic molecules like drugs and fluorophores. ... Otherwise, fluorescent nanoclays can be obtained via covalent attachment of reactive dyes at the edges of the nanoclay sheets after surface modification using silanization chemistries. ...

Tom Felbeck; Thomas Behnke; Katrin Hoffmann; Markus Grabolle; Marina M. Lezhnina; Ulrich H. Kynast; Ute Resch-Genger

2013-08-13T23:59:59.000Z

458

Surface modified coals for enhanced catalyst dispersion and liquefaction  

SciTech Connect (OSTI)

The aim of the study is to enhance catalyst loading and dispersion in coal for improved liquefaction by preadsorption of surfactants and catalysts on to the coal. During this reporting period, zeta potential measurements were conducted to assess the surface charge on the raw, pretreated and catalyzed coal samples. The surface area, transmission spectroscopy and luminescence intensity of the raw coal and pretreated coal samples were also determined to assess the quality of the coal surface. Across a broad range of pH values, the raw coal had an overall negative charge. Coal treated with anionic surfactant SDS maintained an overall net negative surface negative charge. The interaction between the coal and cationic surfactant DDAB caused the opposite effect resulting in a more positive coal surface charge. Although one would have expected little or no effect of the neutral surfactant Triton X-100, there appears to be some difference in the results of the raw coal and the coal treated with Triton X-100. The authors believe that the Triton not only binds to the nonpolar sites but also has a strong affinity for the polar sites through electrostatic bonding and interaction between the hydrophobic tails. The addition of molybdenum to coal pretreated with DDAB caused a reduction in the positive charge of the coal surface probably due to possible ionic interaction between the coal surface, the surfactant and the catalyst. The adsorption isotherm of the coal was characteristic of isotherms for porous samples and the surface area of the coal increased from 30 m{sup 2}/g to 77 m{sup 2}/g when washed with deionized water. This suggests coal washing may be one method of increasing the surface area for surfactant adsorption. Although the transmission measurements provided valuable information about the coal it resulted in little information on the amount of adsorbed Triton. However, the maximum solid-liquid ratio for optimum surfactant loading of Triton X-100 was determined via the UV-Vis spectrophotometer. The luminescence intensity measurements showed that the coal and surfactants luminescence weakly. No statistically significant influence was observed from the actions of the surfactants or surfactant-molybdenum catalyst. Qualitative inspection however, showed that SDS might effectively coat coal surfaces and influence catalyst dispersion. Also, catalysts appeared to be better distributed among coal particles and in finer clusters when DDAB and Triton surfactants were used.

Dr. Yaw D. Yeboah

1998-10-29T23:59:59.000Z

459

Strangeness signals in heavy ion collisions  

SciTech Connect (OSTI)

The experimental data on strange meson and strange baryon production in relativistic heavy ion collisions are reviewed.

Remsberg, L.P.

1992-11-01T23:59:59.000Z

460

Strangeness signals in heavy ion collisions  

SciTech Connect (OSTI)

The experimental data on strange meson and strange baryon production in relativistic heavy ion collisions are reviewed.

Remsberg, L.P.

1992-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ion dispersion thermochronometry" 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

RECENT PROGRESS IN HEAVY ION SOURCES  

E-Print Network [OSTI]

improved Bevalac Fusion reactors Vi Q) U .c. Laser, expl.into thermonuclear fusion reactors. A summary of ion sources

Clark, D.J.

2010-01-01T23:59:59.000Z

462

Dispersivity Testing of Zero-Valent Iron Treatment Cells: Monticello, Utah,  

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

Dispersivity Testing of Zero-Valent Iron Treatment Cells: Dispersivity Testing of Zero-Valent Iron Treatment Cells: Monticello, Utah, November 2005 Through February 2008 Dispersivity Testing of Zero-Valent Iron Treatment Cells: Monticello, Utah, November 2005 Through February 2008 Dispersivity Testing of Zero-Valent Iron Treatment Cells: Monticello, Utah, November 2005 Through February 2008 Dispersivity Testing of Zero-Valent Iron Treatment Cells: Monticello, Utah, November 2005 Through February 2008 More Documents & Publications Final Report Phase II: Performance Evaluation of Permeable Reactive Barriers and Potential for Rejuvenation by Chemical Flushing Phase II: Performance Evaluation of Permeable Reactive Barriers and Potential for Rejuvenation by Chemical Flushing Third (March 2006) Coring and Analysis of Zero-Valent Iron Permeable

463

Update 3 to: A Dispersion Modeling Analysis of Downwash from Mirant's  

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

3 to: A Dispersion Modeling Analysis of Downwash from 3 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant, Modeling Units 1 and 4 Together Update 3 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant, Modeling Units 1 and 4 Together Docket No. EO-05-01. Docket No. EO-05-01. This report describes dispersion modeling performed for Units 1 and 4 at Mirant's Potomac River Generating Station. The purpose of the modeling was to demonstrate that Units 1 and 4, operating together under specific loads and during certain periods in a calendar day will not cause or contribut to excceedences of the National Ambient Air Quality Standards (NAAQS). Update 2 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant, Modeling Units 1 and 4 Together

464

Update 4 to: A Dispersion Modeling Analysis of Downwash from Mirant's  

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

4 to: A Dispersion Modeling Analysis of Downwash from 4 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant, Modeling Unit 4 Emissions at Maximum and Minimum Loads Update 4 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant, Modeling Unit 4 Emissions at Maximum and Minimum Loads Docket No. EO-05-01. This report describes dispersion modeling performed for Unit 4 at Mirant's Potomac River Generating Station. The modeling was performed according to the Protocol approved by the Virginia Deparment of Environmental Quality. The purpose of the modeling was to demonstrate that Unit 4, operating alone under minimum and maximum loads will not cause or contribute to exceedances of the National Ambient Air Quality Standards (NAAQS). Update 4 to: A Dispersion Modeling Analysis of Downwash from Mirant's

465

Ion channels and apoptosis in cancer  

Science Journals Connector (OSTI)

...Issue Ion channels, transporters and cancer compiled and edited by Mustafa B. A...Albrecht Schwab Ion channels and apoptosis in cancer Carl D. Bortner John A. Cidlowski e-mail...Issue Ion channels, transporters and cancer . Humans maintain a constant cell number...

2014-01-01T23:59:59.000Z

466

Accelerator development for heavy ion fusion  

SciTech Connect (OSTI)

Accelerator technology development is presented for heavy ion drivers used in inertial confinement fusion. The program includes construction of low-velocity ''test bed'' accelerator facilities, development of analytical and experimental techniques to characterize ion beam behavior, and the study of ion beam energy deposition.

Talbert, W.L. Jr.; Sawyer, G.A.

1980-01-01T23:59:59.000Z

467

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

468

ION HEATING WITH RF FIELDS NEAR THE ION CYCLOTRON FREQUENCY J. D. Barter, J. C. Sprott  

E-Print Network [OSTI]

ION HEATING WITH RF FIELDS NEAR THE ION CYCLOTRON FREQUENCY by J. D. Barter, J. C. Sprott November. Our experiments of the past year, however, indicate that ion cyclotron resonance heating transmitted without consent of the author and major professor. #12;For several years we have been heating ions

Sprott, Julien Clinton

469

A new statistical dispersion model for tracer tests and contaminant spread in porous media  

SciTech Connect (OSTI)

Dispersion of solutes moving in permeable media is an essential control to describe fluid flow in permeable media. Dispersion can be thought of as a spreading of a solute caused by the presence of microscopic inhomogeneities. An accurate model for dispersion is needed for accurate estimation of oil recovery efficiencies and clean up costs of subsurface contaminants. Current approaches utilizing the fickian assumption fall short in describing the real physics of spreading during a solute transport process. Numerous field investigations have shown that dispersivities measured in the field are much larger than those measured in the lab for the same type of porous material. Moreover, field measured dispersivities have been shown to be scale dependent, that is, a tracer test conducted over a longer travel path will yield a larger dispersivity value than a tracer test conducted in the same geologic formation over a shorter travel path. Numerous approaches to address this problem have been developed yet none attempted to go beyond the Fickian dispersion assumption. In this study, a convective dispersivity is introduced. New model assumes that dispersion is dimensionless and mainly determined by pore size distribution. The new model results in a spread that increases linearly with time contrary to conventional model, which predicts a mixing zone length that increases with square root of time. Therefore, new model explains the field test results that indicate increasing dispersivity with distance. The model validations are in perfect agreement with experimental results, which include; Ganapathy et al.`s slug experiment on Antolini sandstone, Handy`s radioactive tracer experiment on Alhambra sandstone, and CT experiment conducted at BDM-OK/NIPER facilities on Tallant sandstone.

Ates, H.; Kasap, E. [Univ. of Tulsa, OK (United States)

1995-12-31T23:59:59.000Z

470

Fluidity of highly concentrated kaolin suspensions: Influence of particle concentration and presence of dispersant  

Science Journals Connector (OSTI)

This work discusses fluidity of highly concentrated kaolin suspensions prepared by filtration technique in the presence of a dispersant (sodium salt of polyacrylic acid). Two types of rheological tests were carried out on the kaolin aqueous suspensions at different concentrations of kaolin C (1275wt.%) and dispersant Cd (01wt.% of dispersant/wt. of solid). A classical coaxial viscosimeter was used to measure viscosity of suspension when it was fluid-like. A texture analyser was used for rheological analysis of the thicker kaolin suspensions. A solgel (percolation) transition, starting from the kaolin volume fraction ?c=0.05, was observed in the absence of a dispersant. The addition of a dispersant shifted this percolation transition to higher volume fractions. The rheological data showed that the platelet particles can align in a hydrodynamic flow. A dispersant or kaolin load suppresses the interaction forces between basal and edge faces of the kaolin particles, which bear different charges. As a result, a face-to-face arrangement arises, which is supported by the electron microscopy images. Hence, the loosely packed card-house structure, which is typical for the aqueous kaolin suspensions, undergoes a gradual conversion into an oriented structure under the load of solid particles or dispersant. A maximum of the percolation threshold was reached for a certain optimum dosage of the dispersant (Cd?0.5wt.%). The higher filtration efficiency was observed for a loosely packed card-house structure in dispersant-free suspensions at low pH. A dispersant improves fluidity and dryness of the filter cakes, however, produces an oriented face-to-face structure of particles, which causes a rise in resistance to liquid flow during filtration.

Maxim Loginov; Olivier Larue; Nikolai Lebovka; Eugne Vorobiev

2008-01-01T23:59:59.000Z

471

Lithospheric Thickness Modeled from Long Period Surface Wave Dispersion  

SciTech Connect (OSTI)

The behavior of surface waves at long periods is indicative of subcrustal velocity structure. Using recently published dispersion models, we invert surface wave group velocities for lithospheric structure, including lithospheric thickness, over much of the Eastern Hemisphere, encompassing Eurasia, Africa, and the Indian Ocean. Thicker lithosphere under Precambrian shields and platforms are clearly observed, not only under the large cratons (West Africa, Congo, Baltic, Russia, Siberia, India), but also under smaller blocks like the Tarim Basin and Yangtze craton. In contrast, it is found that remobilized Precambrian structures like the Saharan Shield and Sino-Korean Paraplatform do not have well-established lithospheric keels. The thinnest lithospheric thickness is found under oceanic and continental rifts, as well as along convergence zones. We compare our results to thermal models of continental lithosphere, lithospheric cooling models of oceanic lithosphere, lithosphere-asthenosphere boundary (LAB) estimates from S-wave receiver functions, and velocity variations of global tomography models. In addition to comparing results for the broad region, we examine in detail the regions of Central Africa, Siberia, and Tibet. While there are clear differences in the various estimates, overall the results are generally consistent. Inconsistencies between the estimates may be due to a variety of reasons including lateral and depth resolution differences and the comparison of what may be different lithospheric features.

Pasyanos, M E

2008-05-15T23:59:59.000Z

472

Viscosity of alumina nanoparticles dispersed in car engine coolant  

SciTech Connect (OSTI)

The present paper, describes our experimental results on the viscosity of the nanofluid prepared by dispersing alumina nanoparticles (<50 nm) in commercial car coolant. The nanofluid prepared with calculated amount of oleic acid (surfactant) was tested to be stable for more than 80 days. The viscosity of the nanofluids is measured both as a function of alumina volume fraction and temperature between 10 and 50 C. While the pure base fluid display Newtonian behavior over the measured temperature, it transforms to a non-Newtonian fluid with addition of a small amount of alumina nanoparticles. Our results show that viscosity of the nanofluid increases with increasing nanoparticle concentration and decreases with increase in temperature. Most of the frequently used classical models severely under predict the measured viscosity. Volume fraction dependence of the nanofluid viscosity, however, is predicted fairly well on the basis of a recently reported theoretical model for nanofluids that takes into account the effect of Brownian motion of nanoparticles in the nanofluid. The temperature dependence of the viscosity of engine coolant based alumina nanofluids obeys the empirical correlation of the type: log ({mu}{sub nf}) = A exp(BT), proposed earlier by Namburu et al. (author)

Kole, Madhusree; Dey, T.K. [Thermophysical Measurements Laboratory, Cryogenic Engineering Centre, Indian Institute of Technology, Kharagpur 721 302 (India)

2010-09-15T23:59:59.000Z

473

Dispersion of radioactive pollutant in a tornadic storm  

SciTech Connect (OSTI)

A three-dimensional numerical model is used to calculate ground-level air concentration and deposition (due to precipitation scavenging) after a hypothetical tornado strike at a plutonium fabrication facility in Pennsylvania. Plutonium particles less than 10 ..mu..m in diameter are assumed to be lifted into the tornadic storm cell by the vortex. The rotational characteristics of the tornadic storm are embedded within the larger mesoscale flow of the storm system. The design-basis translational wind values are based on probabilities associated with existing records of tornado strikes in the vicinity of the plant site. Turbulence exchange coefficients are based on empirical values deduced from experimental data in severe storms and from theoretical assumptions obtained from the literature. The quasi-Lagrangian method of moments is used to model the transport of concentration within a grid cell volume. In all case studies, the effects of updrafts and downdrafts, coupled with scavenging of the particulates by precipitation, account for most of the material being deposited within 20 to 45 km downwind of the plant site. Ground-level isopleths in the x-y plane show that most of the material is deposited behind and slightly to the left of the centerline trajectory of the storm. Approximately 5% of the material is dispersed into the stratosphere and anvil section of the storm.

Pepper, D.W.

1981-05-01T23:59:59.000Z

474

Advanced liquefaction using coal swelling and catalyst dispersion techniques  

SciTech Connect (OSTI)

Research in this project centers upon developing a new approach to the direct liquefaction of coal to produce an all-distillate product slate at a sizable cost reduction over current technology. The approach integrates all aspects of the coal liquefaction process including coal selection, pretreatment, coal swelling with catalyst impregnation, coal liquefaction experimentation, product recovery with characterization, alternate bottoms processing, and a technical assessment including an economic evaluation. The project is being carried out under contract to the United States Department of Energy. On May 28, 1992, the Department of Energy authorized starting the experimental aspects of this projects; therefore, experimentation at Amoco started late in this quarterly report period. Research contracts with Auburn University, Pennsylvania State University, and Foster Wheeler Development Corporation were signed during June, 1992, so their work was just getting underway. Their work will be summarized in future quarterly reports. A set of coal samples were sent to Hazen Research for beneficiation. The samples were received and have been analyzed. The literature search covering coal swelling has been up-dated, and preliminary coal swelling experiments were carried out. Further swelling experimentation is underway. An up-date of the literature on the liquefaction of coal using dispersed catalysts is nearing completion; it will be included in the next quarterly report.

Curtis, C.W. (Auburn Univ., AL (United States)); Gutterman, C. (Foster Wheeler Development Corp., Livingston, NJ (United States)); Chander, S. (Pennsylvania State Univ., University Park, PA (United States))

1992-08-26T23:59:59.000Z

475

Shear wave dispersion ultrasound vibrometry of gel dosimetry phantoms.  

Science Journals Connector (OSTI)

Shear wavedispersionultrasound vibrometry (SDUV) has been introduced to use the dispersive nature of shear wave speed to locally estimate the material properties or tissue. Shear waves were created using a mechanical shaker and pulsed radiation force. Using the information from the phase one can estimate the shear velocity. A theoretical Voigt model allows us to find at different frequencies (100400 Hz) the viscosity and shear elasticity of the polymer gel dosimeter. The aim of this work was to perform the SDUV and mechanical vibrometry techniques to study the viscoelastic properties of absorbed dose phantoms. The experiments were performed using five phantoms of different absorbed doses varying 10 up to 50 Gy while a nonirradiated phantom was kept as a control. The SDUV technique was performed using a pulsed radiation force to vibrate the gel provide by a confocal transducer with a focal depth of 70 mm nominal frequency of 3 MHz. For the mechanical vibrometry and SDUV experiments shear wave motion measurements were made with a commercial ultrasound machine with a research using a 10 MHz linear array transducer. The quantitative elasticity and viscosity results for these two experiments were compared.

2009-01-01T23:59:59.000Z

476

Nucleon-Nucleon Interactions from Dispersion Relations: Coupled Partial Waves  

E-Print Network [OSTI]

We consider nucleon-nucleon interactions from chiral effective field theory applying the N/D method. The case of coupled partial waves is now treated, extending Ref. [1] where the uncoupled case was studied. As a result three N/D elastic-like equations have to be solved for every set of three independent partial waves coupled. As in the previous reference the input for this method is the discontinuity along the left-hand cut of the nucleon-nucleon partial wave amplitudes. It can be calculated perturbatively in chiral perturbation theory because it involves only irreducible two-nucleon intermediate states. We apply here our method to the leading order result consisting of one-pion exchange as the source for the discontinuity along the left-hand cut. The linear integral equations for the N/D method must be solved in the presence of L - 1 constraints, with L the orbital angular momentum, in order to satisfy the proper threshold behavior for L>= 2. We dedicate special attention to satisfy the requirements of unitarity in coupled channels. We also focus on the specific issue of the deuteron pole position in the 3S1-3D1 scattering. Our final amplitudes are based on dispersion relations and chiral effective field theory, being independent of any explicit regulator. They are amenable to a systematic improvement order by order in the chiral expansion.

M. Albaladejo; J. A. Oller

2012-10-02T23:59:59.000Z

477

Precision Corrections to Dispersive Bounds on Form Factors  

E-Print Network [OSTI]

We present precision corrections to dispersion relation bounds on form factors in bottom hadron semileptonic decays and analyze their effects on parameterizations derived from these bounds. We incorporate QCD two-loop and nonperturbative corrections to the two-point correlator, consider form factors whose contribution to decay rates is suppressed by lepton mass, and implement more realistic estimates of truncation errors associated with the parameterizations. We include higher resonances in the hadronic sum that, together with heavy quark symmetry relations near zero recoil, further tighten the sum rule bounds. Utilizing all these improvements, we show that each of the six form factors in B --> D l nu and B --> D^* l nu can be described with 3% or smaller precision using only the overall normalization and one unknown parameter. A similar one-coefficient parameterization of one of the Lambda_b --> Lambda_c l nu form factors, together with heavy quark symmetry relations valid to order 1/m^2, describes the differential baryon decay rate in terms of one unknown parameter and the phenomenologically interesting quantity (\\bar Lambda)_Lambda \\approx M_{Lambda_b} - m_b. We discuss the validity of slope-curvature relations derived by Caprini and Neubert, and present weaker, corrected relations. Finally, we present sample fits of current experimental B --> D^*l nu and B --> D l nu data to the improved one-parameter expansion.

C. Glenn Boyd; Benjamin Grinstein; Richard F. Lebed

1997-05-07T23:59:59.000Z

478

Comparison Between Simulated And Experimental Au-ion Profiles...  

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

irradiation. The Au ion profiling was measured by secondary ion mass spectrometry (SIMS) and compared to the Au ion distribution predicted by the Stopping and Range of Ions in...

479

Improved Positive Electrode Materials for Li-ion Batteries  

E-Print Network [OSTI]

of the assembled Li-ion battery, such as the operating1-4: Schematic of a Li-ion battery. Li + ions are shuttledprocessing of active Li-ion battery materials. Various

Conry, Thomas Edward

2012-01-01T23:59:59.000Z

480

Ion dip spectroscopy of cold molecules and ions. Progress report  

SciTech Connect (OSTI)

During the past year, the main emphasis in this research program has been on multiphoton ionization spectroscopy of aromatic clusters. This is being pursued in addition to continuing work in areas of ion dip spectroscopy and ion fragmentation spectroscopy. The program has the overall objective of developing improved ultrasensitive molecular detection methods based on multiphoton laser spectroscopy. Photoionization techniques are employed due to their extreme sensitivity combined with mass selectivity. The combination of these two features has led to the current capability to study molecular clusters of specific sizes with high spectral resolution. Clusters are formed in abundance in a supersonic expansion, where they are excited and ionized by an ultraviolet laser beam. The studies reported here are principally based on simple resonant excitation of clusters, followed by one-photon ionization. For the naphthalene clusters, a single laser wavelength suffices for both excitation steps. Additional investigations have been carried out to measure excited state cluster ionization spectra and cluster ion fragmentation spectra. Results from these measurements are not yet sufficiently advanced to report in detail, however the preliminary data support the importance of recently proposed new fundamental ionization mechanisms in clusters. This brief report summarizes results described in more detail in the preprint titled: Resonant two-photon ionization spectroscopy of naphthalene clusters and the preprint titled: Resonance interactions in naphthalene clusters. It also briefly describes preliminary undisclosed results of current investigations.

Wessel, J.E.

1988-08-23T23:59:59.000Z

Note: This page contains sample records for the topic "ion dispersion thermochronometry" from the National Library of EnergyBeta (NLEBeta).
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they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Secondary ion emission from Si bombarded with large Ar cluster ions under UHV conditions  

Science Journals Connector (OSTI)

Si was bombarded with size-selected 40keV Ar cluster ions and positive secondary ions were measured using the time-of-flight technique under high and ultra-high vacuum (HV and UHV respectively) conditions. Si+ ions were main species detected under the incidence of 40keV Ar cluster ions, and the yields of Si cluster ions such as Si4+ were also extremely high under both conditions. On the other hand, oxidized secondary ions such as SiO+ were detected with high intensity only under the HV condition. The yield ratios of oxidized ions decreased in UHV to less than 1% of their values in HV. The effect of residual gas pressure on Si cluster ion yields is relatively low compared to oxidized ions, and the UHV condition is required to obtain accurate secondary ion yields.

Satoshi Ninomiya; Kazuya Ichiki; Yoshihiko Nakata; Yoshiro Honda; Toshio Seki; Takaaki Aoki; Jiro Matsuo

2008-01-01T23:59:59.000Z

482

Oxygen-ion-beam-driven electrostatic ion cyclotron instability of hydrogen plasma  

SciTech Connect (OSTI)

The electrostatic ion cyclotron instability of hydrogen plasma driven by an oxygen ion beam and resulting turbulent heating of both ion species is investigated. The instability growth rate exceeds the oxygen ion gyrofrequency, so that the oxygen ions may be considered as unmagnetized during the process of waves growth. As a result the instability is developed due to inverse Landau damping of the ion cyclotron waves caused by thermal motion of oxygen ions across the magnetic field. The quasilinear analysis of the turbulent heating of both ion species resulted from their interactions with ion cyclotron turbulence indicates that this instability may be responsible for the observed anisotropic heating of auroral outflowing oxygen O{sup +} ions in the ionosphere.

Chibisov, D. V.; Mikhailenko, V. S.; Stepanov, K. N. [Kharkov National University, 61108 Kharkov (Ukraine)

2009-07-15T23:59:59.000Z

483

ULTRA-LOW-ENERGY HIGH-CURRENT ION SOURCE  

E-Print Network [OSTI]

ULTRA-LOW-ENERGY HIGH-CURRENT ION SOURCE (ULEHIIS) Materialenergy, high-intensity ion source (ULEHIIS) for materials

Anders, Andre

2010-01-01T23:59:59.000Z

484

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

485

Cooling neutrons using non-dispersive magnetic excitations  

E-Print Network [OSTI]

A new method is proposed for cooling neutrons by inelastic magnetic scattering in weakly absorbing, cold paramagnetic systems. Kinetic neutron energy is removed in constant decrements determined by the Zeeman energy of paramagnetic atoms or ions in an external magnetic field, or by zero-field level splittings in magnetic molecules. Analytical solutions of the stationary neutron transport equation are given using inelastic neutron scattering cross sections derived in an appendix. They neglect any inelastic process except the paramagnetic scattering and hence still underestimate very-cold neutron densities. Molecular oxygen with its triplet ground state appears particularly promising, notably as a host in fully deuterated oxygen-clathrate hydrate, or more exotically, in dry oxygen-He4 van der Waals clusters. At a neutron temperature about 6 K, for which neutron conversion to ultra-cold neutrons by single-phonon emission in pure superfluid He4 works best, conversion rates due to paramagnetic scattering in the cl...

Zimmer, Oliver

2014-01-01T23:59:59.000Z

486

Review of polarized ion sources (invited)  

SciTech Connect (OSTI)

Recent progress in polarized ion sources development is reviewed. New techniques for production of polarized H{sup -} ion (proton), D{sup -} (D{sup +}), and {sup 3}He{sup ++} ion beams are discussed. Feasibility studies of these techniques are in progress at BNL and other laboratories. Polarized deuteron beams will be required for the polarization program at the Dubna Nuclotron and at the deuteron electric dipole moment experiment at BNL. Experiments with polarized {sup 3}He{sup ++} ion beams are a part of the experimental program at the future electron ion collider.

Zelenski, A. [Brookhaven National Laboratory, Upton, New York 11973 (United States)

2010-02-15T23:59:59.000Z

487

Oxygen ion-beam microlithography  

DOE Patents [OSTI]

A method of providing and developing a resist on a substrate for constructing integrated circuit (IC) chips includes the following steps: of depositing a thin film of amorphous silicon or hydrogenated amorphous silicon on the substrate and exposing portions of the amorphous silicon to low-energy oxygen ion beams to oxidize the amorphous silicon at those selected portions. The nonoxidized portions are then removed by etching with RF-excited hydrogen plasma. Components of the IC chip can then be constructed through the removed portions of the resist. The entire process can be performed in an in-line vacuum production system having several vacuum chambers. Nitrogen or carbon ion beams can also be used. 5 figures.

Tsuo, Y.S.

1991-08-20T23:59:59.000Z

488

Oxygen ion-beam microlithography  

DOE Patents [OSTI]

A method of providing and developing a resist on a substrate for constructing integrated circuit (IC) chips includes the following steps: of depositing a thin film of amorphous silicon or hydrogenated amorphous silicon on the substrate and exposing portions of the amorphous silicon to low-energy oxygen ion beams to oxidize the amorphous silicon at those selected portions. The nonoxidized portions are then removed by etching with RF-excited hydrogen plasma. Components of the IC chip can then be constructed through the removed portions of the resist. The entire process can be performed in an in-line vacuum production system having several vacuum chambers. Nitrogen or carbon ion beams can also be used.

Tsuo, Y. Simon (Lakewood, CO)

1991-01-01T23:59:59.000Z

489

Electrolytes for lithium ion batteries  

SciTech Connect (OSTI)

A family of electrolytes for use in a lithium ion battery. The genus of electrolytes includes ketone-based solvents, such as, 2,4-dimethyl-3-pentanone; 3,3-dimethyl 2-butanone(pinacolone) and 2-butanone. These solvents can be used in combination with non-Lewis Acid salts, such as Li.sub.2[B.sub.12F.sub.12] and LiBOB.

Vaughey, John; Jansen, Andrew N.; Dees, Dennis W.

2014-08-05T23:59:59.000Z

490

Ion plated electronic tube device  

DOE Patents [OSTI]

An electronic tube and associated circuitry which is produced by ion plating techniques. The process is carried out in an automated process whereby both active and passive devices are produced at very low cost. The circuitry is extremely reliable and is capable of functioning in both high radiation and high temperature environments. The size of the electronic tubes produced are more than an order of magnitude smaller than conventional electronic tubes.

Meek, T.T.

1983-10-18T23:59:59.000Z

491

Central collisions of heavy ions  

SciTech Connect (OSTI)

This report describes the activities of the Heavy Ion Physics Group at the University of California, Riverside from October 1, 1991 to September 30, 1992. During this period, the program focused on particle production at AGS energies, and correlation studies at the Bevalac in nucleus-nucleus central collisions. As part of the PHENIX collaboration, contributions were made to the Preliminary Conceptual Design Report (pCDR), and work on a RHIC silicon microstrip detector R D project was performed.

Fung, Sun-yiu.

1992-10-01T23:59:59.000Z

492

Laser photoelectron spectroscopy of ions  

SciTech Connect (OSTI)

This enterprise uses photoelectron spectroscopy to study the properties of negative ions and radicals. The essence of our experiment is to cross a 0.6 keV mass-selected ion beam (M{sup {minus}}) with the output of a CW laser, {Dirac h}{omega}{sub o}. The resultant detached photoelectrons with kinetic energy, KE, are energy analyzed by means of a set of electrostatic hemispherical analyzers. Analysis of the photoelectron spectra enables us to extract molecular electron affinities, vibrational frequencies and electronic splittings of the final radical, M, as well as the relative molecular geometries of ions (M{sup {minus}}) and radicals (M). We have scrutinized the two simplest nitrenes: methylnitrene (CH{sub 3}N) and phenylnitrene (C{sub 6}H{sub 5}N). By preparing the corresponding anions, CH{sub 3}N{sup {minus}} and C{sub 6}H{sub 5}N{sup {minus}}, we have studied these nitrene biradicals. Singlet methylnitrene is especially interesting since it is formally a transition state.''

Ellison, G.B.

1992-01-16T23:59:59.000Z

493

Ion Channel Engineering: Perspectives and Strategies  

Science Journals Connector (OSTI)

Abstract Ion channels facilitate the passive movement of ions down an electrochemical gradient and across lipid bilayers in cells. This phenomenon is essential for life and underlies many critical homeostatic processes in cells. Ion channels are diverse and differ with respect to how they open and close (gating) and to their ionic conductance/selectivity (permeation). Fundamental understanding of ion channel structurefunction mechanisms, their physiological roles, how their dysfunction leads to disease, their utility as biosensors, and development of novel molecules to modulate their activity are important and active research frontiers. In this review, we focus on ion channel engineering approaches that have been applied to investigate these aspects of ion channel function, with a major emphasis on voltage-gated ion channels.

Prakash Subramanyam; Henry M. Colecraft

2014-01-01T23:59:59.000Z

494

THE DISPERSIVE EFFECT OF SODIUM SILICATE ON KAOLINITE PARTICLES IN PROCESS WATER: IMPLICATIONS FOR IRON-ORE PROCESSING  

Science Journals Connector (OSTI)

...contrast to polyacrylic acid (Figure 2...hinders the dispersants adsorption...low-molecular-weight polyacrylic acid on the coagulation...low-molecular-weight polyacrylic acid on silica...widely as a dispersant of silicate...

Mark Ma

495

Lattice dynamics of the potential-induced breathing model: Phonon dispersion in the alkaline-earth oxides  

Science Journals Connector (OSTI)

We find the dynamical matrix for the potential-induced breathing (PIB) model for ionic solids, and calculate with no adjustable parameters the phonon-dispersion relations for the alkaline-earth oxides in the B1 structure. Our approach is similar to that of Gordon and Kim, in which the crystalline charge densities are estimated by overlapping atomic charge densities, which are then converted to energy by electron-gas approximations. It goes beyond the original Gordon-Kim model by allowing for spherical breathing of the atoms in response to the long-range potential, and beyond later refinements of the modified-electron-gas models by explicitly including the effects of PIB on the self-energy and the overlap interactions. This allows us to treat general deformations and lattice dynamics including the many-body PIB effects. PIB couples the long- and short-range forces in a way that is not present in any other lattice-dynamical model, since the spherical charge relaxation is coupled to the long-range electrostatic potential. PIB gives better agreement for the splitting of the longitudinal- and transverse-optic mode frequencies than is found with rigid-ion models, as well as much improved acoustic branches. PIB is a nonempirical model; no experimental data are used other than the values of fundamental constants such as Plancks constant and the atomic masses.

Ronald E. Cohen; L. L. Boyer; M. J. Mehl

1987-04-15T23:59:59.000Z

496

Lateral solids dispersion coefficient in large-scale fluidized beds  

SciTech Connect (OSTI)

The design of fuel feed ports in a large-scale fluidized bed combustor depends on the fuel characteristics and lateral solids mixing. However, the reported values of the effective lateral solids dispersion coefficient (D{sub sr}) are scattered in the broad range of 0.0001-0.1 m{sup 2}/s. With the aim of predicting D{sub sr} in wider fluidized beds which is difficult to measure directly or deduce from experimental results in lab-scale facilities, a computational method is proposed. It combines the Eulerian-Granular simulation and fictitious particle tracing technique. The value of D{sub sr} is calculated based on the movement of the tracers. The effect on D{sub sr} of bed width (W) ranging from 0.4 m up to 12.8 m at different levels of superficial gas velocity (U{sub 0}) is investigated. It is found that increasing W whilst maintaining U{sub 0}, D{sub sr} initially increases markedly, then its increase rate declines, and finally it stays around a constant value. The computed values of D{sub sr} are examined quantitatively and compared with a thorough list of the measured D{sub sr} in the literature since 1980s. Agreed with the measurements performed in the pilot-scale fluidized beds, the value of D{sub sr} in wider facilities at higher fluidizing velocities is predicted to be around the order of magnitude of 0.1 m{sup 2}/s, much higher than that in lab-scale beds. Finally, the effect of D{sub sr} on the distribution of fuel particles over the cross section in fluidized beds with the specified layout of feed ports is discussed. (author)

Liu, Daoyin; Chen, Xiaoping [School of Energy and Environment, Southeast University, Nanjing 210096 (China)

2010-11-15T23:59:59.000Z

497

On the application of computational fluid dynamics codes for liquefied natural gas dispersion.  

SciTech Connect (OSTI)

Computational fluid dynamics (CFD) codes are increasingly being used in the liquefied natural gas (LNG) industry to predict natural gas dispersion distances. This paper addresses several issues regarding the use of CFD for LNG dispersion such as specification of the domain, grid, boundary and initial conditions. A description of the k-{var_epsilon} model is presented, along with modifications required for atmospheric flows. Validation issues pertaining to the experimental data from the Burro, Coyote, and Falcon series of LNG dispersion experiments are also discussed. A description of the atmosphere is provided as well as discussion on the inclusion of the Coriolis force to model very large LNG spills.

Luketa-Hanlin, Anay Josephine; Koopman, Ronald P. (Lawrence Livermore National Laboratory, Livermore, CA); Ermak, Donald (Lawrence Livermore National Laboratory, Livermore, CA)

2006-02-01T23:59:59.000Z

498

Dispersion engineering of high-Q silicon microresonators via thermal oxidation  

E-Print Network [OSTI]

We propose and demonstrate a convenient and sensitive technique for precise engineering of group-velocity dispersion in high-Q silicon microresonators. By accurately controlling the surface-oxidation thickness of silicon microdisk resonators, we are able to precisely manage the zero-dispersion wavelength while simultaneously further improving the high optical quality of our devices, with the optical Q close to a million. The demonstrated dispersion management allows us to achieve parametric generation with precisely engineerable emission wavelengths, which shows great potential for application in integrated silicon nonlinear and quantum photonics.

Jiang, Wei C; Usechak, Nicholas G; Lin, Qiang

2014-01-01T23:59:59.000Z

499

Integral method for the calculation of Hawking radiation in dispersive media I. Symmetric asymptotics  

E-Print Network [OSTI]

Hawking radiation has become experimentally testable thanks to the many analogue systems which mimic the effects of the event horizon on wave propagation. These systems are typically dominated by dispersion, and give rise to a numerically soluble and stable ODE only if the rest-frame dispersion relation $\\Omega^{2}(k)$ is a polynomial of relatively low degree. Here we present a new method for the calculation of wave scattering in a one-dimensional medium of arbitrary dispersion. It views the wave equation as an integral equation in Fourier space, which can be solved using standard and efficient numerical techniques.

Scott Robertson; Ulf Leonhardt

2014-03-27T23:59:59.000Z

500

A Facile High-speed Vibration Milling Method to Water-disperse Single- walled Carbon Nanohorns  

SciTech Connect (OSTI)

A high-speed vibration milling (HSVM) method was applied to synthesize water dispersible single- walled carbon nanohorns (SWNHs). Highly reactive free radicals (HOOCCH2CH2 ) produced from an acyl peroxide under HSVM conditions react with hydrophobic SWNHs to produce a highly water dispersible derivative (f-SWNHs), which has been characterized in detail by spectroscopic and microscopic techniques together with thermogravimetric analysis (TGA) and dynamic light scatter- ing (DLS). The carboxylic acid functionalized, water-dispersible SWNHs material are versatile precursors that have potential applications in the biomedical area.

Shu, Chunying [Virginia Polytechnic Institute and State University (Virginia Tech); Zhang, Jianfei [Virginia Polytechnic Institute and State University (Virginia Tech); Sim, Jae Hyun [Virginia Polytechnic Institute and State University (Virginia Tech); Burke, Brian [University of Virginia, Charlottesville; Williams, Keith A [University of Virginia, Charlottesville; Rylander, Nichole M [Virginia Polytechnic Institute and State University (Virginia Tech); Campbell, Tom [Virginia Polytechnic Institute and State University (Virginia Tech); Puretzky, Alexander A [ORNL; Rouleau, Christopher M [ORNL; Geohegan, David B [ORNL; More, Karren Leslie [ORNL; Esker, Alan R [Virginia Polytechnic Institute and State University (Virginia Tech); Gibson, Harry W [Virginia Polytechnic Institute and State University (Virginia Tech); Dorn, Harry C [Virginia Polytechnic Institute and State University (Virginia Tech)

2010-01-01T23:59:59.000Z