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Note: This page contains sample records for the topic "bubble chamber tracks" from the National Library of EnergyBeta (NLEBeta).
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We encourage you to perform a real-time search of NLEBeta
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1

SciTech Connect: ON THE ANALYSIS OF BUBBLE CHAMBER TRACKS  

Office of Scientific and Technical Information (OSTI)

by such analysis. The discussion is based largely on experience gained in performing hydrogen bubble chamber experiments with the University of California's Bevatron (6-Bev proton...

2

LRL 25-inch Bubble Chamber  

DOE R&D Accomplishments (OSTI)

The recently completed 25-inch hydrogen bubble chamber combines excellent picture quality with a fast operating cycle. The chamber has a unique optical system and is designed to take several pictures each Bevatron pulse, in conjunction with the Bevatron rapid beam ejection system.

Alvarez, L. W.; Gow, J. D.; Barrera, F.; Eckman, G.; Shand, J.; Watt, R.; Norgren, D.; Hernandez, H. P.

1964-07-08T23:59:59.000Z

3

Argonne starts huilding huge bubble chamber  

Science Journals Connector (OSTI)

Argonne starts huilding huge bubble chamber ... Construction has started on the $10 million bubble chamber to be built at Argonne National Laboratory, Argonne, 111. ... Claimed by Argonne to be the world's largest chamber, it will be completed in 1969. ...

1967-06-26T23:59:59.000Z

4

DIMUON PRODUCTION BY HIGH ENERGY NEUTRINOS AND ANTINEUTRINOS IN THE FERMILAB FIFTEEN-FOOT BUBBLE CHAMBER  

E-Print Network (OSTI)

ANTINEUTRINOS IN THE FERMILAB FIFTEEN-FOOT BUBBLE CHAMBERANTINEUTRINOS IN THE FERMILAB FIFTEEN-FOOT BUBBLE CHAMBER*ANTINEUTRINOS IN THE FERMILAB FIFTEEN-FOOT BUBBLE CHAMBER

Orthel, John L.

2010-01-01T23:59:59.000Z

5

Bubble Chambers for Experiments in Nuclear Astrophysics  

E-Print Network (OSTI)

A bubble chamber has been developed to be used as an active target system for low energy nuclear astrophysics experiments. Adopting ideas from dark matter detection with superheated liquids, a detector system compatible with gamma-ray beams has been developed. This detector alleviates some of the limitations encountered in standard measurements of the minute cross sections of interest to stellar environments. While the astrophysically relevant nuclear reaction processes at hydrostatic burning temperatures are dominated by radiative captures, in this experimental scheme we measure the time-reversed processes. Such photodisintegrations allow us to compute the radiative capture cross sections when transitions to excited states of the reaction products are negligible. Due to the transformation of phase space, the photodisintegration cross sections are up to two orders of magnitude higher. The main advantage of the new target-detector system is a density several orders of magnitude higher than conventional gas tar...

DiGiovine, B; Holt, R J; Rehm, K E; Raut, R; Robinson, A; Sonnenschein, A; Rusev, G; Tonchev, A P; Ugalde, C

2015-01-01T23:59:59.000Z

6

Reanalysis of bubble chamber measurements of muon-neutrino induced single pion production  

E-Print Network (OSTI)

There exists a longstanding disagreement between bubble chamber measurements of the single pion production channel $\

Callum Wilkinson; Philip Rodrigues; Susan Cartwright; Lee Thompson; Kevin McFarland

2014-11-17T23:59:59.000Z

7

Reanalysis of bubble chamber measurements of muon-neutrino induced single pion production  

E-Print Network (OSTI)

There exists a longstanding disagreement between bubble chamber measurements of the single pion production channel $\

Wilkinson, Callum; Cartwright, Susan; Thompson, Lee; McFarland, Kevin

2014-01-01T23:59:59.000Z

8

-The Bubble Chamber -http://thebubblechamber.org -Review: Cold War Social Science  

E-Print Network (OSTI)

[1] - The Bubble Chamber - http://thebubblechamber.org - Review: Cold War Social Science Posted assume that all developments in the social sciences during the Cold War period can be The Bubble Chamber

Solovey, Mark

9

Development of bubble chambers with sensitivity to WIMPs , J. I. Collarb*  

E-Print Network (OSTI)

of high- stability bubble chambers containing heavy liquids as an alternative to SDDs. The use of a stableDevelopment of bubble chambers with sensitivity to WIMPs L. Bonda , J. I. Collarb* , J. Elya , M@uchicago.edu We constructed a small bubble chamber, with special features needed to search for WIMPs: long

Collar, Juan I.

10

Invention and History of the Bubble Chamber (LBNL Summer Lecture Series)  

ScienceCinema (OSTI)

Summer Lecture Series 2006: Don Glaser won the 1960 Nobel Prize for Physics for his 1952 invention of the bubble chamber at Berkeley Lab, a type of particle detector that became the mainstay of high-energy physics research throughout the 1960s and 1970s. He discusses how, inspired by bubbles in a glass of beer, he invented the bubble chamber and detected cosmic-ray muons.

Glaser, Don

2011-04-28T23:59:59.000Z

11

Bubble tracking in image sequences Da-chuan Cheng and Hans Burkhardt  

E-Print Network (OSTI)

Bubble tracking in image sequences Da-chuan Cheng and Hans Burkhardt Institute of Pattern-(0)761-2038272 Fax: +49-(0)761-2038262 #12;1 Bubble tracking in image sequences Da-chuan Cheng and Hans Burkhardt of Freiburg,79110, Germany Abstract In this paper, we develop a system which can track bubbles in image

12

Acoustic studies for alpha background rejection in dark matter bubble chamber detectors  

SciTech Connect

COUPP (Chicagoland Observatory for Underground Particle Physics) is an experiment with bubble chambers able to detect dark matter directly either with Spin-Dependent or with Spin-Independent interactions. The target material is a superheated liquid (usually CF3I) that can be bubble nucleated due to nuclear recoils produced by elastic collisions of dark matter particles. The bubble growth inside the chamber is accompanied with an acoustic signature. The acoustic technique has been successfully used to have a good alpha discrimination (about 99%). In this paper, we present different studies and results related with the characterization of the acoustic properties of the detector and the different phenomena involved in the acoustic measurements of the bubble growth, such as sound generation, sound transmission and optimization of piezoelectric transducers.

Bou-Cabo, M.; Felis, I.; Ardid, M.; Collaboration: COUPP Collaboration

2013-08-08T23:59:59.000Z

13

arXiv:astro-ph/0503398v117Mar2005 Development of Bubble Chambers With Enhanced Stability and Sensitivity to  

E-Print Network (OSTI)

arXiv:astro-ph/0503398v117Mar2005 Development of Bubble Chambers With Enhanced Stability Fermi National Accelerator Laboratory, Batavia, IL, USA The viability of using a Bubble Chamber for rare stability in such a detector are described. Results from prototype trials indicate that sensitivity to low

Collar, Juan I.

14

Real-time seam tracking for rocket thrust chamber manufacturing  

SciTech Connect

A sensor-based control approach for real-time seam tracking of rocket thrust chamber assemblies has been developed to enable automation of a braze paste dispensing process. This approach utilizes a non-contact Multi-Axis Seam Tracking (MAST) sensor to track the seams. Thee MAST sensor measures capacitance variations between the sensor and the workpiece and produces four varying voltages which are read directly into the robot controller. A PID control algorithm which runs at the application program level has been designed based upon a simple dynamic model of the combined robot and sensor plant. The control algorithm acts on the incoming sensor signals in real-time to guide the robot motion along the seam path. Experiments demonstrate that seams can be tracked at 100 mm/sec within the accuracy required for braze paste dispensing.

Schmitt, D.J.; Novak, J.L. [Sandia National Labs., Albuquerque, NM (United States); Starr, G.P. [New Mexico Univ., Albuquerque, NM (United States); Maslakowski, J.E. [Rockwell International Corp., Canoga Park, CA (United States). Rocketdyne Div.

1993-11-01T23:59:59.000Z

15

Readout of TPC Tracking Chambers with GEMs and Pixel Chip  

SciTech Connect

Two layers of GEMs and the ATLAS Pixel Chip, FEI3, have been combined and tested as a prototype for Time Projection Chamber (TPC) readout at the International Linear Collider (ILC). The double-layer GEM system amplifies charge with gain sufficient to detect all track ionization. The suitability of three gas mixtures for this application was investigated, and gain measurements are presented. A large sample of cosmic ray tracks was reconstructed in 3D by using the simultaneous timing and 2D spatial information from the pixel chip. The chip provides pixel charge measurement as well as timing. These results demonstrate that a double GEM and pixel combination, with a suitably modified pixel ASIC, could meet the stringent readout requirements of the ILC.

Kadyk, John; Kim, T.; Freytsis, M.; Button-Shafer, J.; Kadyk, J.; Vahsen, S.E.; Wenzel, W.A.

2007-12-21T23:59:59.000Z

16

TRACKING BUBBLES IN HIGHSPEED IMAGE SEQUENCES DACHUAN CHENG AND HANS BURKHARDT  

E-Print Network (OSTI)

Freiburg, Germany ABSTRACT In this study, we develop a semi­automatic system for tracking bubbles in image physical properties such as the testing liquid, the surface structure of the heated tube, temperature structure of heated tubes, temperature, pressure and so on. These variations have a high impact

17

PERFORMANCE CHARACTERISTICS OF THE FERMILAB 15-FOOT BUBBLE CHAMBER WITH A 1/3-SCALE INTERNAL PICKET FENCE (IPF) AND A TWO-PLANE EXTERNAL MUON IDENTIFIER (EMI)  

E-Print Network (OSTI)

L. Stevenson, G. P. Yost; Fermilab: B. Chrisman, D. Gee, A.of Hawaii; and M. Atac, Fermilab; "Status of the InternalPicket Fence for the Fermilab 15-Foot Bubble Chamber", U. H.

Stevenson, M.L.

2011-01-01T23:59:59.000Z

18

First Dark Matter Search Results from a 4-kg CF$_3$I Bubble Chamber Operated in a Deep Underground Site  

SciTech Connect

New data are reported from the operation of a 4.0 kg CF{sub 3}I bubble chamber in the 6800 foot deep SNOLAB underground laboratory. The effectiveness of ultrasound analysis in discriminating alpha decay background events from single nuclear recoils has been confirmed, with a lower bound of >99.3% rejection of alpha decay events. Twenty single nuclear recoil event candidates and three multiple bubble events were observed during a total exposure of 553 kg-days distributed over three different bubble nucleation thresholds. The effective exposure for single bubble recoil-like events was 437.4 kg-days. A neutron background internal to the apparatus, of known origin, is estimated to account for five single nuclear recoil events and is consistent with the observed rate of multiple bubble events. This observation provides world best direct detection constraints on WIMP-proton spin-dependent scattering for WIMP masses >20 GeV/c{sup 2} and demonstrates significant sensitivity for spin-independent interactions.

Behnke, E.; /Indiana U., South Bend; Behnke, J.; /Indiana U., South Bend; Brice, S.J.; /Fermilab; Broemmelsiek, D.; /Fermilab; Collar, J.I.; /Chicago U., EFI; Conner, A.; /Indiana U., South Bend; Cooper, P.S.; /Fermilab; Crisler, M.; /Fermilab; Dahl, C.E.; /Chicago U., EFI; Fustin, D.; /Chicago U., EFI; Grace, E.; /Indiana U., South Bend /Fermilab

2012-04-01T23:59:59.000Z

19

Determination of astrophysical thermonuclear rates with a bubble chamber: The {sup 12}C(??){sup 16}O reaction case  

SciTech Connect

The {sup 12}C(??){sup 16}O reaction rate is considered one of the most important unknown parameters in the physics of structure and evolution of massive stars. While extensive experimental campaigns have been performed trying to improve the quality of the measurements, the rate still holds very large uncertainties. Here we discuss a new experimantal scheme to measure the cross section of this reaction with a bubble chamber and a bremsstrahlung beam. The main advantage of the technique is a gain in the luminosity of several orders of magnitude when compared to other ongoing experiments.

DiGiovine, B.; Henderson, D.; Holt, R. J.; Rehm, K. E. [Argonne National Laboratory, Argonne IL 60439 (United States); Grames, J.; Meekins, D.; Poelker, M.; Suleiman, R. [Jefferson Lab, Newport News, VA 23606 (United States); Robinson, A.; Ugalde, C., E-mail: cugalde@uchicago.edu [University of Chicago, Chicago, IL 60637 (United States); Sonnenschein, A. [Fermilab, Batavia, IL 60510 (United States)

2013-11-07T23:59:59.000Z

20

Photoelectron track length distributions measured in a negative ion time projection chamber  

E-Print Network (OSTI)

We report photoelectron track length distributions between 3 and 8 keV in gas mixtures of Ne+CO2+CH3NO2 (260:80:10 Torr) and CO2+CH3NO2 (197.5: 15 Torr). The measurements were made using a negative ion time projection chamber (NITPC) at the National Synchrotron Light Source (NSLS) at the Brookhaven National Laboratory (BNL). We report the first quantitative analysis of photoelectron track length distributions in a gas. The distribution of track lengths at a given energy is best fit by a lognormal distribution. A powerlaw distribution of the form, f(E)=a(E/Eo)n, is found to fit the relationship between mean track length and energy. We find n=1.29 +/- 0.07 for Ne+CO2+CH3NO2 and n=1.20 +/- 0.09 for CO2+CH3NO2. Understanding the distribution of photoelectron track lengths in proportional counter gases is important for optimizing the pixel size and the dimensions of the active region in electron-drift time projection chambers (TPCs) and NITPC X-ray polarimeters.

Prieskorn, Z R; Kaaret, P E; Black, J K

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "bubble chamber tracks" 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

Precise 3D track reconstruction algorithm for the ICARUS T600 liquid argon time projection chamber detector  

E-Print Network (OSTI)

Liquid Argon Time Projection Chamber (LAr TPC) detectors offer charged particle imaging capability with remarkable spatial resolution. Precise event reconstruction procedures are critical in order to fully exploit the potential of this technology. In this paper we present a new, general approach of three-dimensional reconstruction for the LAr TPC with a practical application to track reconstruction. The efficiency of the method is evaluated on a sample of simulated tracks. We present also the application of the method to the analysis of real data tracks collected during the ICARUS T600 detector operation with the CNGS neutrino beam.

M. Antonello; B. Baibussinov; P. Benetti; E. Calligarich; N. Canci; S. Centro; A. Cesana; K. Cieslik; D. B. Cline; A. G. Cocco; A. Dabrowska; D. Dequal; A. Dermenev; R. Dolfini; C. Farnese; A. Fava; A. Ferrari; G. Fiorillo; D. Gibin; S. Gninenko; A. Guglielmi; M. Haranczyk; J. Holeczek; A. Ivashkin; J. Kisiel; I. Kochanek; J. Lagoda; S. Mania; A. Menegolli; G. Meng; C. Montanari; S. Otwinowski; A. Piazzoli; P. Picchi; F. Pietropaolo; P. Plonski; A. Rappoldi; G. L. Raselli; M. Rossella; C. Rubbia; P. Sala; A. Scaramelli; E. Segreto; F. Sergiampietri; D. Stefan; J. Stepaniak; R. Sulej; M. Szarska; M. Terrani; F. Varanini; S. Ventura; C. Vignoli; H. Wang; X. Yang; A. Zalewska; K. Zaremba

2012-10-18T23:59:59.000Z

22

Georges Charpak, Particle Detectors, and Multiwire Chambers  

NLE Websites -- All DOE Office Websites (Extended Search)

Georges Charpak, Particle Detectors, and Multiwire Chambers Georges Charpak, Particle Detectors, and Multiwire Chambers Resources with Additional Information · Patents Georges Charpak Courtesy of CERN Nobel laureate Georges Charpak [was] a pioneer in the art and science of particle detection ... . [He] developed a host of particle detectors used throughout experimental particle physics. In 1968, he invented and developed the first multiwire proportional chamber, for which he won the [Physics] Nobel Prize in 1992 ... . The multiwire chamber differed from earlier detectors in the speed with which it could record particle tracks from a collision-millions per second, rather than one or two per second for bubble chambers. The speed of the multiwire chamber and its successor technologies, along with their extraordinary precision, led to a revolution in particle physics ... . The technology that Charpak pioneered also finds applications in medicine and industry.

23

Nuclear Instruments and Methods in Physics Research A 469 (2001) 4754 The HERMES forward tracking chambers: construction,  

E-Print Network (OSTI)

, which use an Ar=CF4=CO2 (90 : 5 : 5) gas mixture. No degradation in chamber performance has been. PACS: 29.40.Cs; 07.89.+b Keywords: Wire chamber; CF4 gas; Aging studies; Radiation damage; HERMES rate operation of chambers with gas mixtures containing CF4. 2. Mechanical design Each chamber consists

24

Modeling bubble-vortex interactions Modeling and simulation of multiple bubble entrainment and interactions with two  

E-Print Network (OSTI)

Modeling bubble-vortex interactions Modeling and simulation of multiple bubble entrainment, OR 97331. (Dated: 5 November 2010) 1 #12;Modeling bubble-vortex interactions Simulations of bubble direct numerical simulation whereas motion of subgrid bubbles is modeled using Lagrangian track- ing

Apte, Sourabh V.

25

Information Content of Particle Tracks  

Science Journals Connector (OSTI)

The information content of a track is analyzed with respect to the prime track-variable g and to the particle velocity on which g depends. Quantities are operationally defined that are applicable to emulsion, bubble-chamber or cloud-chamber tracks inclined with arbitrary dip angles. The theory is developed of the projected linear structure of such particle tracks. Previously derived connections between the true value of g and measurable track features are reviewed. A new and independent estimate of g based on the mean blob length is introduced. The two independent quantities, mean gap length and mean blob length, each yield measurements of g. These are combined into an estimate of maximum likelihood. It is argued that in a practical sense this exhausts the information content of the track. The statistical error of this result is evaluated. It is found that correct utilization of the information in the measured blob lengths greatly reduces the error. Suggestions are made regarding technique for the reduction of error in g and in particle masses estimated from grain-density measurements.

Walter H. Barkas

1961-11-01T23:59:59.000Z

26

Flow chamber  

DOE Patents (OSTI)

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

Morozov, Victor (Manassas, VA)

2011-01-18T23:59:59.000Z

27

Stability of magnetic equilibria in radio bubbles  

Science Journals Connector (OSTI)

......chamber, driving a magnetic bubble expansion. Laboratory electrostatic helicity injection has been used in applications from spheromak formation to non-inductive current drive in spherical tori. Much analysis has gone into the shock at the astrophysical......

Gregory Benford

2006-06-11T23:59:59.000Z

28

In-Jet Tracking Efficiency Analysis for the STAR Time Projection Chamber in Polarized Proton-Proton Collisions at sqrt(s) = 200GeV  

E-Print Network (OSTI)

in polarized proton-proton collision experiments. TPC's in-jet tracking efficiency represents the largest systematic uncertainty on jet energy scale at high transverse momentum, whose measurement contributes to the understanding of the spin structure of protons...

Huo, Liaoyuan

2012-07-16T23:59:59.000Z

29

Full-Volume, Three-Dimensional, Transient Measurements of Bubbly Flows Using Particle Tracking Velocimetry and Shadow Image Velocimetry Coupled with Pattern Recognition Techniques  

SciTech Connect

Develop a state-of-the-art non-intrusive diagnostic tool to perform simultaneous measurements of both the temporal and three-dimensional spatial velocity of the two phases of a bubbly flow. These measurements are required to provide a foundation for studying the constitutive closure relations needed in computational fluid dynamics and best-estimate thermal hydraulic codes employed in nuclear reactor safety analysis and severe accident simulation. Such kinds of full-field measurements are not achievable through the commonly used point-measurement techniques, such as hot wire, conductance probe, laser Doppler anemometry, etc. The results can also be used in several other applications, such as the dynamic transport of pollutants in water or studies of the dispersion of hazardous waste.

Yassin Hassan

2001-11-30T23:59:59.000Z

30

Bubblesort 1 Bubble Sort  

E-Print Network (OSTI)

Bubblesort 1 Bubble Sort An Archaelogical Algorithmic Analysis Owen Astrachan ola@cs.duke.edu http://www.cs.duke.edu/~ola NSF CAREER 9702550 CRCD 0088078 #12;Bubblesort 2 Bubble sort: what can we study? What is bubble sort and what are its origins? When did it appear, when was it named? Why is bubble sort studied and why

Astrachan, Owen

31

Ionization chamber  

DOE Patents (OSTI)

An ionization chamber has separate drift and detection regions electrically isolated from each other by a fine wire grid. A relatively weak electric field can be maintained in the drift region when the grid and another electrode in the chamber are connected to a high voltage source. A much stronger electric field can be provided in the detection region by connecting wire electrodes therein to another high voltage source. The detection region can thus be operated in a proportional mode when a suitable gas is contained in the chamber. High resolution output pulse waveforms are provided across a resistor connected to the detection region anode, after ionizing radiation enters the drift region and ionize the gas.

Walenta, Albert H. (Port Jefferson Station, NY)

1981-01-01T23:59:59.000Z

32

Nora Nortmann From Bubble to Bubble: Task Dependent Selection of  

E-Print Network (OSTI)

Nora Nortmann From Bubble to Bubble: Task Dependent Selection of Image Content by Overt Visual: Thorsten Hinrichs © Institute of Cognitive Science #12;From Bubble to Bubble: Task Dependent Selection: Prof. Dr. Peter König Submitted: March 22, 2007 #12;From Bubble to Bubble: Task Dependent Selection

Kallenrode, May-Britt

33

Single-bubble sonoluminescence.  

E-Print Network (OSTI)

??To gain insight into the mechanism by which nonvolatile species enter a cavitating bubble???s core and emit light, sulfuric acid (H2SO4) and a surfactant sodium (more)

Campbell, Rachel K.

2010-01-01T23:59:59.000Z

34

The formation of gas bubbles at submerged orifices  

E-Print Network (OSTI)

. For values of Nc greater than 0.85, the formation and release of the bubbles appeared to occur almost simul? taneously. For the formation of bubbles at zero chamber volume and at low flow rates, the following equation was developed. (2) Ve * equilibrium... experimentally. The d determined for water (benzene (

Hayes, William Bell

2013-10-04T23:59:59.000Z

35

Bubble Manipulation by Self Organization of Bubbles inside Ultrasonic Wave  

Science Journals Connector (OSTI)

Microbubble manipulation using ultrasonic waves is a promising technology in the fields of future medicine and biotechnology. For example, it is considered that bubble trapping using ultrasonic waves may play an important role in drug or gene delivery systems in order to trap the drugs or genes in the diseased tissue. Usually, when bubbles are designed so that they carry payloads, such as drug or gene, they tend to be harder than free bubbles. These hard bubbles receive a small acoustic radiation force, which is not sufficient for bubble manipulation. In this paper, a novel method of microbubble manipulation using ultrasonic waves is proposed. This method uses seed bubbles in order to manipulate target bubbles. When the seed bubbles are introduced into the ultrasonic wave field, they start to oscillate to produce a bubble aggregation of a certain size. Then the target bubbles are introduced, the target bubbles attach around the seed bubbles producing a bubble mass with bilayers (inner layer: seed bubbles, outer layer: target bubbles). The target bubbles are manipulated as a bilayered bubble mass. Basic experiments are carried out using polyvinyl chloride (PVC) shell bubbles. No target bubbles are trapped when only the target bubbles are introduced. However, they are trapped if the seed bubbles are introduced in advance.

Yoshiki Yamakoshi; Masato Koganezawa

2005-01-01T23:59:59.000Z

36

Chamber transport  

SciTech Connect

Heavy ion beam transport through the containment chamber plays a crucial role in all heavy ion fusion (HIF) scenarios. Here, several parameters are used to characterize the operating space for HIF beams; transport modes are assessed in relation to evolving target/accelerator requirements; results of recent relevant experiments and simulations of HIF transport are summarized; and relevant instabilities are reviewed. All transport options still exist, including (1) vacuum ballistic transport, (2) neutralized ballistic transport, and (3) channel-like transport. Presently, the European HIF program favors vacuum ballistic transport, while the US HIF program favors neutralized ballistic transport with channel-like transport as an alternate approach. Further transport research is needed to clearly guide selection of the most attractive, integrated HIF system.

OLSON,CRAIG L.

2000-05-17T23:59:59.000Z

37

Bubble Colloidal AFM Probes Formed from Ultrasonically Generated Bubbles  

E-Print Network (OSTI)

Letters Bubble Colloidal AFM Probes Formed from Ultrasonically Generated Bubbles Ivan U. Vakarelski forces between two small bubbles (80-140 µm) in aqueous solution during controlled collisions) was extended to measure interaction forces between a cantilever-attached bubble and surface-attached bubbles

Chan, Derek Y C

38

Breaking down the bubbly | EMSL  

NLE Websites -- All DOE Office Websites (Extended Search)

down the bubbly Breaking down the bubbly Micromodels redefine how bubbles characterize CO2 gas flow No, it's not a Lego: This Lab-on-a-Chip micromodel (left) was designed to...

39

Methane emission by bubbling from Gatun Lake, Panama  

SciTech Connect

We studied methane emission by bubbling from Gatun Lake, Panama, at water depths of less than 1 m to about 10 m. Gas bubbles were collected in floating traps deployed during 12- to 60-hour observation periods. Comparison of floating traps and floating chambers showed that about 98% of methane emission occurred by bubbling and only 2% occurred by diffusion. Average methane concentration of bubbles at our sites varied from 67% to 77%. Methane emission by bubbling occurred episodically, with greatest rates primarily between the hours of 0800 and 1400 LT. Events appear to be triggered by wind. The flux of methane associated with bubbling was strongly anticorrelated with water depth. Seasonal changes in water depth caused seasonal variation of methane emission. Bubble methane fluxes through the lake surface into the atmosphere measured during 24-hour intervals were least (10-200 mg m{sup -2} d{sup -1}) at deeper sites (>7 m) and greatest (300-2000 mg m{sup -2} d{sup -1}) at shallow sites (<2 m). 37 refs., 11 figs., 5 tabs.

Keller, M. [National Center for Atmospheric Research, Boulder, CO (United States)] [National Center for Atmospheric Research, Boulder, CO (United States); Stallard, R.F. [Geological Survey, Denver, CO (United States)] [Geological Survey, Denver, CO (United States)

1994-04-20T23:59:59.000Z

40

Viscosity Destabilizes Sonoluminescing Bubbles  

Science Journals Connector (OSTI)

In single-bubble sonoluminescence (SBSL) microbubbles are trapped in a standing sound wave, typically in water or water-glycerol mixtures. However, in viscous liquids such as glycol, methylformamide, or sulphuric acid it is not possible to trap the bubble in a stable position. This is very peculiar as larger viscosity normally stabilizes the dynamics. Suslick and co-workers call this new mysterious state of SBSL moving-SBSL. We identify the history force (a force nonlocal in time) as the origin of this destabilization and show that the instability is parametric. A force balance model quantitatively accounts for the observed quasiperiodic bubble trajectories.

Ruediger Toegel; Stefan Luther; Detlef Lohse

2006-03-20T23:59:59.000Z

Note: This page contains sample records for the topic "bubble chamber tracks" 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

Charged Vacuum Bubble Stability  

E-Print Network (OSTI)

A type of scenario is considered where electrically charged vacuum bubbles, formed from degenerate or nearly degenerate vacuua separated by a thin domain wall, are cosmologically produced due to the breaking of a discrete symmetry, with the bubble charge arising from fermions residing within the domain wall. Stability issues associated with wall tension, fermion gas, and Coulombic effects for such configurations are examined. The stability of a bubble depends upon parameters such as the symmetry breaking scale and the fermion coupling. A dominance of either the Fermi gas or the Coulomb contribution may be realized under certain conditions, depending upon parameter values.

J. R. Morris

1998-10-20T23:59:59.000Z

42

Neutron imaging with bubble chambers for inertial confinement fusion.  

E-Print Network (OSTI)

??One of the main methods to obtain energy from controlled thermonuclear fusion is inertial confinement fusion (ICF), a process where nuclear fusion reactions are initiated (more)

Ghilea, Marian Constantin (1973 - ); Meyerhofer, David D.

2011-01-01T23:59:59.000Z

43

Bubbles spawn tiny twisters  

Science Journals Connector (OSTI)

... After years of careful experimentation, physicists have finally created a tempest in a teapot-sized vessel. By heating a container topped with a soap bubble, a team of ...

Geoff Brumfiel

2008-04-09T23:59:59.000Z

44

Effect of bubble interactions on mass transfer in bubbly flow  

Science Journals Connector (OSTI)

Abstract The effect of bubble interactions on mass transfer in a multi-bubble system is examined by numerical simulations. Since mass transfer in the liquid phase of gasliquid multiphase flows usually takes place at a considerably slower rate than the transfer of momentum, the mass flux boundary layers are much thinner than the momentum boundary layers. In direct numerical simulations the resolution requirements for flows with mass transfer are therefore considerably higher than for flows without mass transfer. Here, we use a multiscale approach for the computations of the mass transfer near the bubble surface, in order to reduce the cost, and examine the effect of void fraction and bubble Reynolds number on the mass transfer from bubbles in periodic domains. Specifically, we compare results for a single bubble in a periodic domain with results for several bubbles in a larger domain with the same void fraction. It is shown that even though the average Reynolds number of freely moving bubbles drops after a while, in most cases the mass transfer from the bubbles increases slightly. When the bubbles start to wobble, in most cases the increase in bubblebubble interactions compensate for the reduction in Reynolds number.

B. Aboulhasanzadeh; G. Tryggvason

2014-01-01T23:59:59.000Z

45

Domain walls and double bubbles  

Science Journals Connector (OSTI)

...5, which are never double bubbles, that is, none is the global...transverse cylinder, torus bubble, inner tube and double hydrant...transverse cylinder and the stability of the cylinder cross. The...three-dimensional double bubbles and show that the method can...

2009-01-01T23:59:59.000Z

46

Quantum Subcritical Bubbles  

E-Print Network (OSTI)

We quantize subcritical bubbles which are formed in the weakly first order phase transition. We find that the typical size of the thermal fluctuation reduces in the quantum-statistical physics. We estimate the typical size and the amplitude of thermal fluctuations near the critical temperature in the electroweak phase transition using quantum statistical average. Furthermore based on our study, we give implication on the dynamics of phase transition.

Tomoko Uesugi; Masahiro Morikawa; Tetsuya Shiromizu

1996-06-26T23:59:59.000Z

47

Laser calibration system for the CERES Time Projection Chamber  

E-Print Network (OSTI)

A Nd:YAG laser was used to simulate charged particle tracks at known positions in the CERES Time Projection Chamber at the CERN SPS. The system was primarily developed to study the response of the readout electronics and to calibrate the electron drift velocity. Further applications were the determination of the gating grid transparency, the chamber position calibration, and long-term monitoring of drift properties of the gas in the detector.

Dariusz Miskowiec; Peter Braun-Munzinger

2008-02-15T23:59:59.000Z

48

Microfluidic Actuation Using Electrochemically Generated Bubbles  

E-Print Network (OSTI)

Microfluidic Actuation Using Electrochemically Generated Bubbles Susan Z. Hua,*, Frederick Sachs, Buffalo, New York 14260 Bubble-based actuation in microfluidic applications is attractive owing closing) rate increases with applied voltage, small microfluidic dimensions accelerate bubble deflation

Sachs, Frederick

49

Bioinspired bubble design for particle generation  

Science Journals Connector (OSTI)

...Reports 1004 18 23 131 Bioinspired bubble design for particle generation Oguzhan...generate homogeneous particles from a bubble suspension, with the capability to control loading and the structure of bubbles. Ideally, a process such as this...

2012-01-01T23:59:59.000Z

50

Inertial cavitation and singlebubble sonoluminescence  

Science Journals Connector (OSTI)

...there exist regions for bubble stability at higher pressure amplitudes...resonance may affect the bubble's position and stability signifi- cantly. (Note...well as the jitter in the bubble's stability) is measured in picoseconds...

1999-01-01T23:59:59.000Z

51

The Environmental Chamber  

NLE Websites -- All DOE Office Websites (Extended Search)

2 2 The Environmental Chamber Al Hodgson and Richard Allen test methyl chloride exposures using the environmental chamber. On the second floor of an unremarkable building at LBL, researchers are using a room within a room to smoke out indoor air pollutants. The environmental chamber is a stainless-steel-lined room of 540 ft cubed (20 meters cubed) which can be operated in several ways to meet the needs of different research projects, including studies for which a very low background is required. Scientists of the Indoor Environment Program and their collaborators use the chamber as a controlled indoor environment to study the behavior of a variety of indoor pollutants ranging from cigarette smoke to volatile organic compounds (VOCs) from new carpets. At the moment, four projects use the facility. Principal investigator Al

52

BNL | ATF Experimental Chambers  

NLE Websites -- All DOE Office Websites (Extended Search)

Laser Injection Vacuum Chamber Located on beam line 1, the "Smith-Purcell box" has 140 liters of usable volume. Due to its size, it is mounted on a fixed platform. Hosted...

53

Mercury Chamber Considerations  

E-Print Network (OSTI)

Mercury Chamber Considerations V. Graves IDS-NF Target Studies July 2011 #12;2 Managed by UT-Battelle for the U.S. Department of Energy Mercury Chamber Considerations, July 2011 Flow Loop Review · 1 cm dia nozzle, 20 m/s jet requires 1.57 liter/sec mercury flow (94.2 liter/min, 24.9 gpm). · MERIT experiment

McDonald, Kirk

54

Sleeve reaction chamber system  

DOE Patents (OSTI)

A chemical reaction chamber system that combines devices such as doped polysilicon for heating, bulk silicon for convective cooling, and thermoelectric (TE) coolers to augment the heating and cooling rates of the reaction chamber or chambers. In addition the system includes non-silicon-based reaction chambers such as any high thermal conductivity material used in combination with a thermoelectric cooling mechanism (i.e., Peltier device). The heat contained in the thermally conductive part of the system can be used/reused to heat the device, thereby conserving energy and expediting the heating/cooling rates. The system combines a micromachined silicon reaction chamber, for example, with an additional module/device for augmented heating/cooling using the Peltier effect. This additional module is particularly useful in extreme environments (very hot or extremely cold) where augmented heating/cooling would be useful to speed up the thermal cycling rates. The chemical reaction chamber system has various applications for synthesis or processing of organic, inorganic, or biochemical reactions, including the polymerase chain reaction (PCR) and/or other DNA reactions, such as the ligase chain reaction.

Northrup, M. Allen (Berkeley, CA); Beeman, Barton V. (San Mateo, CA); Benett, William J. (Livermore, CA); Hadley, Dean R. (Manteca, CA); Landre, Phoebe (Livermore, CA); Lehew, Stacy L. (Livermore, CA); Krulevitch, Peter A. (Pleasanton, CA)

2009-08-25T23:59:59.000Z

55

Energy focusing in bubbly flows  

Science Journals Connector (OSTI)

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

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

1998-01-01T23:59:59.000Z

56

Sonoluminescing air bubbles rectify argon  

E-Print Network (OSTI)

The dynamics of single bubble sonoluminescence (SBSL) strongly depends on the percentage of inert gas within the bubble. We propose a theory for this dependence, based on a combination of principles from sonochemistry and hydrodynamic stability. The nitrogen and oxygen dissociation and subsequent reaction to water soluble gases implies that strongly forced air bubbles eventually consist of pure argon. Thus it is the partial argon (or any other inert gas) pressure which is relevant for stability. The theory provides quantitative explanations for many aspects of SBSL.

Detlef Lohse; Michael P. Brenner; Todd F. Dupont; Sascha Hilgenfeldt; Blaine Johnston

1996-05-07T23:59:59.000Z

57

Under consideration for publication in J. Fluid Mech. 1 Bubble entrainment and liquid-bubble  

E-Print Network (OSTI)

Under consideration for publication in J. Fluid Mech. 1 Bubble entrainment and liquid-bubble ?; accepted ?.) Liquid-bubble interaction, especially in complex two-phase bubbly flow under breaking waves-Stokes solver extended to incorporate entrained bubble populations, using an Eulerian-Eulerian formulation

Kirby, James T.

58

Under consideration for publication in J. Fluid Mech. 1 Bubble entrainment and liquid-bubble  

E-Print Network (OSTI)

Under consideration for publication in J. Fluid Mech. 1 Bubble entrainment and liquid-bubble surface layer. It entrains a large volume of air in bubbles that rapidly evolves into a dis- tribution of bubble sizes which interacts with liquid turbulence and organized motions. The liquid-bubble interaction

Kirby, James T.

59

Active microuidic mixer and gas bubble lter driven by thermal bubble micropump$  

E-Print Network (OSTI)

Active micro¯uidic mixer and gas bubble ®lter driven by thermal bubble micropump$ Jr-Hung Tsaia Abstract A micro¯uidic mixer with a gas bubble ®lter activated by a thermal bubble actuated nozzle/min. The optimal mixing result is found when the actuating frequency of thermal bubble reaches 200 Hz. Normalized

Lin, Liwei

60

Liquid Wall Chambers  

SciTech Connect

The key feature of liquid wall chambers is the use of a renewable liquid layer to protect chamber structures from target emissions. Two primary options have been proposed and studied: wetted wall chambers and thick liquid wall (TLW) chambers. With wetted wall designs, a thin layer of liquid shields the structural first wall from short ranged target emissions (x-rays, ions and debris) but not neutrons. Various schemes have been proposed to establish and renew the liquid layer between shots including flow-guiding porous fabrics (e.g., Osiris, HIBALL), porous rigid structures (Prometheus) and thin film flows (KOYO). The thin liquid layer can be the tritium breeding material (e.g., flibe, PbLi, or Li) or another liquid metal such as Pb. TLWs use liquid jets injected by stationary or oscillating nozzles to form a neutronically thick layer (typically with an effective thickness of {approx}50 cm) of liquid between the target and first structural wall. In addition to absorbing short ranged emissions, the thick liquid layer degrades the neutron flux and energy reaching the first wall, typically by {approx}10 x x, so that steel walls can survive for the life of the plant ({approx}30-60 yrs). The thick liquid serves as the primary coolant and tritium breeding material (most recent designs use flibe, but the earliest concepts used Li). In essence, the TLW places the fusion blanket inside the first wall instead of behind the first wall.

Meier, W R

2011-02-24T23:59:59.000Z

Note: This page contains sample records for the topic "bubble chamber tracks" 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

Secondary emission gas chamber  

E-Print Network (OSTI)

For a hadron calorimeter active element there is considered a gaseous secondary emis-sion detector (150 micron gap, 50 kV/cm). Such one-stage parallel plate chamber must be a radiation hard, fast and simple. A model of such detector has been produced, tested and some characteristics are presented.

V. In'shakov; V. Kryshkin; V. Skvortsov

2014-12-10T23:59:59.000Z

62

Improved wire chamber  

DOE Patents (OSTI)

An improved gas mixture for use with proportional counter devices, such as Geiger-Mueller tubes and drift chambers. The improved gas mixture provides a stable drift velocity while eliminating wire aging caused by prior art gas mixtures. The new gas mixture is comprised of equal parts argon and ethane gas and having approximately 0.25% isopropyl alcohol vapor. 2 figs.

Atac, M.

1987-05-12T23:59:59.000Z

63

TRACKING SITE  

Energy Science and Technology Software Center (OSTI)

003235MLTPL00 AASG Geothermal Data submissions tracking application and site. https://github.com/usgin/aasgtrack

64

Passage of a Bubble?Detonation Wave into a Chemically Inactive Bubble Medium  

Science Journals Connector (OSTI)

Passage of detonation waves from a chemically active bubble medium into a chemically inactive bubble medium is studied experimentally. The structure of ... pressures of these waves for different parameters of bubble

A. I. Sychev

2001-07-01T23:59:59.000Z

65

Collapse of Kaluza-Klein bubbles  

Science Journals Connector (OSTI)

Kaluza-Klein theory admits bubble configurations, in which the circumference of the fifth dimension shrinks to zero on some compact surface. A three parameter family of such bubble initial data at a moment of time symmetry (some including a magnetic field) has been found by Brill and Horowitz, generalizing the (zero-energy) Witten bubble solution. Some of these data have negative total energy. We show here that all the negative energy bubble solutions start out expanding away from the moment of time symmetry, while the positive energy bubbles can start out either expanding or contracting. Thus it is unlikely that the negative energy bubbles would collapse and produce a naked singularity.

Steven Corley and Ted Jacobson

1994-06-15T23:59:59.000Z

66

Asymmetric responses, risk seeking and internet bubble  

Science Journals Connector (OSTI)

We measure internet bubbles to verify the existence and evaporation of the internet bubble in early 2000. Then, we compare investor responses to internet stocks with those to traditional stocks to find how the internet bubble formed. Empirical results confirm that the internet bubble existed between 1998 and 1999, but began to evaporate in early 2000. Further, we find that the internet bubble formed due to investors' irrational overreaction to internet firms' positive outlooks and underreaction to internet firms' negative outlooks relative to their reactions to traditional firms. This finding supports our hypotheses that asset bubbles formed due to investors' extreme risk-seeking asymmetric responses to good and bad information.

Jaehan Koh; Bin Wang; Lai C. Liu; Kai S. Koong

2010-01-01T23:59:59.000Z

67

Multi-anode ionization chamber  

DOE Patents (OSTI)

The present invention includes a high-energy detector having a cathode chamber, a support member, and anode segments. The cathode chamber extends along a longitudinal axis. The support member is fixed within the cathode chamber and extends from the first end of the cathode chamber to the second end of the cathode chamber. The anode segments are supported by the support member and are spaced along the longitudinal surface of the support member. The anode segments are configured to generate at least a first electrical signal in response to electrons impinging thereon.

Bolotnikov, Aleksey E. (South Setauket, NY); Smith, Graham (Port Jefferson, NY); Mahler, George J. (Rocky Point, NY); Vanier, Peter E. (Setauket, NY)

2010-12-28T23:59:59.000Z

68

Acoustic cavitation: the fluid dynamics of nonspherical bubbles  

Science Journals Connector (OSTI)

...penetrating the bubble interior. 4. Bubble behaviour near an oscillating...clean jet penetrating a cavitation bubble in the direction of the oscillating...ent. First, the remarkable stability of the bubble motion--the presumably toroidal...

1999-01-01T23:59:59.000Z

69

Gas content effect on bubble motion  

Science Journals Connector (OSTI)

The gas content is one of the important bubble parameters. In this article, the gas content effect on the bubble motion is investigated by numerical simulation based on the...

Yang, Bo; Chen, Xiao; Xu, Rongqing; Lu, Jian; Ni, Xiaowu

2005-01-01T23:59:59.000Z

70

Diffusion stability of bubbles in a cluster  

Science Journals Connector (OSTI)

The diffusion stability of gas bubbles in one-fraction and two-fraction clusters ... gas concentrations in the liquid at which the bubble tends to one of two equilibrium states because of diffusion processes betw...

. Sh. Nasibullaeva; I. Sh. Akhatov

2007-07-01T23:59:59.000Z

71

Studies on bubble films of molten slags  

Science Journals Connector (OSTI)

...Al2O3 slags can increase the stability of bubble films. For instance, the...increase in the lifetime/stability of the slag bubble films. important criterion when determining the stability of slag foams. For instance...

1998-01-01T23:59:59.000Z

72

The impact of bubble diffusivity on confined oscillated bubbly liquid Sergey Shklyaev1  

E-Print Network (OSTI)

The impact of bubble diffusivity on confined oscillated bubbly liquid Sergey Shklyaev1 and Arthur V the dynamics of monodisperse bubbly liquid confined by two plane solid walls and subject to small with typical relaxation times for a single bubble but comparable with the period of volume eigenoscillations

Straube, Arthur V.

73

The growth of vapor bubble and relaxation between two-phase bubble flow  

Science Journals Connector (OSTI)

This paper presents the behavior of the bubble growth and relaxation between vapor and superheated...

S. Mohammadein; Rama Subba Reddy Gorla

2003-01-01T23:59:59.000Z

74

Beating the Bubble: Using Kinematic Triggering in the Bubble Lens for Acquiring Small, Dense Targets  

E-Print Network (OSTI)

Beating the Bubble: Using Kinematic Triggering in the Bubble Lens for Acquiring Small, Dense Seattle, WA 98195 USA {memott, wobbrock}@uw.edu ABSTRACT We present the Bubble Lens, a new target acquisition technique that remedies the limitations of the Bubble Cursor to increase the speed and accuracy

Wobbrock, Jacob O.

75

Bubble formation in Rangely Field, Colorado  

E-Print Network (OSTI)

tc Determine the Effect of Times Of. Standing on Time &equired for Bubble Formation at 67 psi Supersaturaticns. Page 20 Tests to Determine Bubble Frequency. Average Bubble Frequency Data. 23 27 The data reported in this thesis deal... if present, or would tend to form one. However, as the pressure on the saturated oil declines, the oil becomes supersatur- ated, except as bubbles may form and diffusion take place tc eliminate the supersaturation. This research is devoted to a study...

Wood, J. W

1953-01-01T23:59:59.000Z

76

THE BACTERIOLOGY OF THE BUBBLE FOUNTAIN  

Science Journals Connector (OSTI)

...research-article Articles THE BACTERIOLOGY OF THE BUBBLE FOUNTAIN 1 Dorothy F. Pettibone Franklin...December 29, 1915. The Bacteriology of the Bubble Fountain. | Laboratory of Medical Bacteriology...Journal Article THE BACTERIOLOGY OF THE BUBBLE FOUNTAIN' DOROTHY F. PETTIBONE, FRANKLIN...

Dorothy F. Pettibone; Franklin B. Bogart; Paul F. Clark

1916-09-01T23:59:59.000Z

77

Bubble Universe Dynamics After Free Passage  

E-Print Network (OSTI)

We consider bubble collisions in single scalar field theories with multiple vacua. Recent work has argued that at sufficiently high impact velocities, collisions between such bubble vacua are governed by 'free passage' dynamics in which field interactions can be ignored during the collision, providing a systematic process for populating local minima without quantum nucleation. We focus on the time period that follows the bubble collision and provide evidence that, for certain potentials, interactions can drive significant deviations from the free-passage bubble profile, thwarting the production of bubbles with different field values.

Pontus Ahlqvist; Kate Eckerle; Brian Greene

2014-12-26T23:59:59.000Z

78

The four-chambered heart.  

E-Print Network (OSTI)

??The Four-Chambered Heart is a collection of four short stories centering around themes and motifs most popular in the genre of magical realism. Important to (more)

Christie, Jennifer L.

2013-01-01T23:59:59.000Z

79

ADAPTIVE ROBUST TRACKING CONTROL OF PRESSURE  

E-Print Network (OSTI)

accuracy of pressure trajectory in the chamber when the pneumatic cylinder is moving. Off-line fitting, it is necessary to utilize the adaptive model compensation for improving the tracking accuracy of pressure and attenuation in pneumatic lines, valve dynamics, flow nonlinearities through the valve orifice, piston friction

Yao, Bin

80

Micromegas chambers for the ATLAS Muon Spectrometer Upgrade  

E-Print Network (OSTI)

Micromegas (Micro MEsh Gaseous Structure) chambers have been proven along the years to be reliable fast detectors with an excellent spatial resolution. The ATLAS collaboration at LHC has chosen the micromegas technology along with the small-strip Thin Gap Chambers (sTGC) for the high luminosity upgrade of the inner muon station in the high-rapidity region, the so called New Small Wheel (NSW). It employs eight layers of micromegas detectors and eight layers of sTGC. The NSW project requires fully efficient micromegas chambers with spatial resolution down to $100\\mu m$ over a total active area of $1200 m^2$ with a rate capability up to $10 kHz/cm^2$ and operation in a moderate magnetic field up to B=0.3 T. The required tracking capability is provided by the intrinsic space resolution combined with a mechanical precision at the level of $30 \\mu m$ along the precision coordinate. Moreover together with the precise tracking capability the micromegas chambers should provide a trigger signal. An extensive R&D pr...

Ntekas, Konstantinos; The ATLAS collaboration

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "bubble chamber tracks" 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

MFE Chamber Overview Mohamed Abdou  

E-Print Network (OSTI)

MFE Chamber Overview Mohamed Abdou Presented to: Chamber Technology Peer Review UCLA, Los Angeles/Be/structure thermomechanics interactions - Framework: IEA collaboration; part of US strategy to gain access to the larger to VNS; sparked world interest - IEA initiated a study in 1994 on VNS, called HVPNS. A scholarly

Abdou, Mohamed

82

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

83

Multimaterial Front Tracking Fang Da, Christopher Batty, and Eitan Grinspun  

E-Print Network (OSTI)

.8 [Simulation and Modeling]: Types of Simulation--Animation Additional Key Words and Phrases: front tracking. Numerous additional physical and mathemat- ical applications have this same form: soap bubbles and dry the space of possible entangled mesh configurations that can arise, and topological transformations

84

Bifurcation structure of bubble oscillators  

Science Journals Connector (OSTI)

Methods from chaos physics are applied to a model of a driven spherical gas bubble in water to determine its dynamic properties especially its resonance behavior and bifurcation structure. The dynamic properties are described in a growing level of abstraction by radius?time curves trajectories in state space strange attractors in the Poincar plane basins of attraction bifurcation diagrams winding number diagrams and phase diagrams. A sequence of bifurcation diagrams is given exemplifying the recurrent pattern in the bifurcation set and its relation to the resonances of the system. Period?doubling cascades to chaos and back (period bubbling) are a prominent recurring feature connected with each resonance (demonstrated for period?1 period?2 and period?3 resonances and observed for some higher?order resonances). The recurrent nature of the bifurcation set is most easily seen in the phase diagrams given. A similar structure of the bifurcation set has also been found for other nonlinear oscillators (Duffing Toda laser and Morse).

U. Parlitz; V. Englisch; C. Scheffczyk; W. Lauterborn

1990-01-01T23:59:59.000Z

85

Bubble Number in a Caviting Flow Henri Gouin  

E-Print Network (OSTI)

Bubble Number in a Caviting Flow Henri Gouin C.N.R.S. U.M.R. 6181 & Universit´e d of bubbles (a number of bubbles per unit of volume in the flow). The maximum intensity of cavitation; Bubble formation; Bubble dynamics; Cavitation. PACS: 47.55.Ca; 47.55.db; 47.55.dd; 47.55.dp 1

Paris-Sud XI, Université de

86

Collapse of Kaluza-Klein Bubbles  

E-Print Network (OSTI)

Kaluza-Klein theory admits ``bubble" configurations, in which the circumference of the fifth dimension shrinks to zero on some compact surface. A three parameter family of such bubble initial data at a moment of time-symmetry (some including a magnetic field) has been found by Brill and Horowitz, generalizing the (zero-energy) ``Witten bubble" solution. Some of these data have negative total energy. We show here that all the negative energy bubble solutions start out expanding away from the moment of time symmetry, while the positive energy bubbles can start out either expanding or contracting. Thus it is unlikely that the negative energy bubbles would collapse and produce a naked singularity.

Steven Corley; Ted Jacobson

1994-03-09T23:59:59.000Z

87

Femtosecond laser pulse control of collapsing bubble jets and bubble ejection streams  

Science Journals Connector (OSTI)

We study cavitation dynamics when focusing high angle Bessel beams in water. We observe remarkable bubble dynamics with jets directed along the laser axis, bubble break-up and ejection...

Faccio, Daniele; Tamosauskas, Gintaras; Rubino, Eleonora; Darginavicius, Julius; Papazoglou, Dimitris; Tzortzakis, Stelios; Couairon, Arnaud; Dubietis, Audrius

88

Influence of bubble diameter and solids concentration on bubble stability: Development of a novel analytical approach  

Science Journals Connector (OSTI)

The properties and thickness of the bubbles in the froth control the flotation process. ... There is no work showing how to measure bubble film composition and thickness by a straightforward ... work, a novel app...

Hong-Jun Liu ???; Wei Zhang ??; Chun-Bao Sun ???

2014-09-01T23:59:59.000Z

89

SCIENCE AT THE CROSSROADS The Transhumanism Bubble*  

E-Print Network (OSTI)

SCIENCE AT THE CROSSROADS The Transhumanism Bubble* Stuart A. Newman Contemporary proposals to use biotechnology to modify human beings, an initiative with both academic and ``movement'' (Transhumanism

Newman, Stuart A.

90

Bubble size effect on effervescent atomization.  

E-Print Network (OSTI)

??This paper presents the results from a number of studies conducted in an effort to gain insight into how to control bubble size during gas (more)

Shepard, Thomas G.

2011-01-01T23:59:59.000Z

91

An acoustic technique for measurement of bubble solids mass loading (a) Fundamental study of single bubble  

E-Print Network (OSTI)

An acoustic technique for measurement of bubble solids mass loading ­ (a) Fundamental study of single bubble Wen Zhang , Steven J. Spencer, Peter Coghill Lucas Heights Research Laboratory, CSIRO i n f o Article history: Available online 6 March 2012 Keywords: Flotation bubbles On-line analysis

Zhang, Wen

92

Light diffusing fiber optic chamber  

DOE Patents (OSTI)

A light diffusion system for transmitting light to a target area. The light is transmitted in a direction from a proximal end to a distal end by an optical fiber. A diffusing chamber is operatively connected to the optical fiber for transmitting the light from the proximal end to the distal end and transmitting said light to said target area. A plug is operatively connected to the diffusing chamber for increasing the light that is transmitted to the target area.

Maitland, Duncan J. (Lafayette, CA)

2002-01-01T23:59:59.000Z

93

Fluid mechanics of bubble capture by the diving bell spider  

E-Print Network (OSTI)

The water spider, a unique member of its species, is used as inspiration for a bubble capture mechanism. Bubble mechanics are studied in the pursuit of a biomimetic solution for transporting air bubbles underwater. Careful ...

Brooks, Alice (Alice P.)

2010-01-01T23:59:59.000Z

94

The incorporation of bubbles into a computer graphics fluid simulation  

E-Print Network (OSTI)

We present methods for incorporating bubbles into a photorealistc fluid simulation. Previous methods of fluid simulation in computer graphics do not include bubbles. Our system automatically creates bubbles, which are simulated on top of the fluid...

Greenwood, Shannon Thomas

2005-08-29T23:59:59.000Z

95

Artificial Bubble Cloud Targets for Underwater Acoustic Remote Sensing  

Science Journals Connector (OSTI)

This article describes a technique that uses polymer additives to suspend air bubbles to form stable artificial bubble clouds. The results presented include the range of polymer concentrations for an effective bubble suspension; the void fraction,...

Paul A. Hwang; Ronald A. Roy; Lawrence A. Crum

1995-12-01T23:59:59.000Z

96

Bubbles in Insulating Liquids: Stability in an Electric Field  

Science Journals Connector (OSTI)

...July 1964 research-article Bubbles in Insulating Liquids: Stability in an Electric Field C. G...Krasucki It is shown that a bubble of gas or liquid, immersed...of incompressible (liquid) bubbles immersed in an insulating liquid...

1964-01-01T23:59:59.000Z

97

A new damping mechanism in strongly collapsing bubbles  

Science Journals Connector (OSTI)

...predictions of the limits of stability of sonoluminescing bubbles as well as theoretical...predictions of the limits of stability of sonoluminescing bubbles (Hilgenfeldt et al...the theory of the stability of sonolu- minescing bubbles (Hilgenfeldt et al...

2000-01-01T23:59:59.000Z

98

Modelling of spherical gas bubble oscillations and sonoluminescence  

Science Journals Connector (OSTI)

...for the other aspects of bubble dynamics (stability, rectified diffusion...qualitatively similar. For the stability of the bubble against mass diffusion...effects on the spherical stability of bubbles. Phys. Fluids. (In the...

1999-01-01T23:59:59.000Z

99

Propagation through nonlinear time-dependent bubble clouds and the estimation of bubble populations from measured acoustic characteristics  

Science Journals Connector (OSTI)

...not only because of the number of bubbles involved, but also because of the...R. White waves to entrain large bubbles which greatly affect the stability of the inversion (see below). The bubble populations generated in the surf...

2004-01-01T23:59:59.000Z

100

Hydrogen Bubbles and Formation of Nanoporous Silicon during Electroche...  

NLE Websites -- All DOE Office Websites (Extended Search)

Bubbles and Formation of Nanoporous Silicon during Electrochemical Etching. Hydrogen Bubbles and Formation of Nanoporous Silicon during Electrochemical Etching. Abstract: Many...

Note: This page contains sample records for the topic "bubble chamber tracks" 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

GERSHEY, ROBERT M. A bubble adsorption device for the isolation ...  

Science Journals Connector (OSTI)

Apr 21, 1982 ... A bubble adsorption device for the isolation of surface-active organic matter in seawater1. Abstract-A new sampling device uses a bubble...

2000-02-08T23:59:59.000Z

102

Hydrodynamic solutions for a sonoluminescing gas bubble  

Science Journals Connector (OSTI)

Analytic solutions for a sonoluminescing gas bubble have been obtained which provide density pressure and temperature distributions for the gas inside a bubble oscillating under the ultrasonic field. The solutions have revealed that sonoluminescence should occur just prior to the bubble collapse and its duration is less than 300 ps and that increase and subsequent decrease in the bubble wall acceleration induces the quenching of gas followed by the substantial temperature rise up to 100?000 K which can be regarded as a thermal spike. The gas temperature inside the bubble near collapse is determined primarily by the amount of radiation heat loss. Shock formation during the bubble collapse is questionable because gas density as well as pressure at the bubble center are much greater than those at the bubble wall during this stage. It also turns out that the number of electrons ionized the ion species and the kinetic energy of electrons affect the spectrum of light emission crucially. The spectralradiance calculated is in good agreement with the observed data qualitatively which suggests that the origin of sonoluminescences is bremsstrahlung rather than thermal blackbody radiation. [Work supported by Korea Science and Engineering Foundation.

Ho?Young Kwak; Jung?Hee Na

1996-01-01T23:59:59.000Z

103

Bubble dynamics, shock waves and sonoluminescence  

Science Journals Connector (OSTI)

...The bubble has still not reached its mini- mum volume; the bubble content is compressed...coordinates with finite differences on a static grid, where the shape of the jet is extracted...right to the left. Small values on the grid represent the liquid and large values the...

1999-01-01T23:59:59.000Z

104

Bubble growth and rise in soft sediments  

Science Journals Connector (OSTI)

...predict rates of bubble rise as a result...model the unstable gas accumulations...measured the fracture strength, K 1c, of sediments...M., 2002, Gas production and...in artificial sludge deposits: Waste...containing large gas bubbles: Geotechnique...

105

Directional muon jet chamber for a muon collider (Groovy Chamber)  

SciTech Connect

A directional jet drift chamber with PAD readout is proposed here which can select vertex originated muons within a given time window and eliminate those muons which primarily originate upstream, using only a PAD readout. Drift time provides the Z-coordinate, and the center of gravity of charge distribution provides the r-{psi} coordinates. Directionality at the trigger level is obtained by the timing measurement from the PAD hits within a given time window. Because of the long drift time between the bunch crossings, a muon collider enables one to choose a drift distance in the drift chamber as long as 50 cm. This is an important factor in reducing cost of drift chambers which have to cover relatively large areas.

Atac, M. [Fermi National Accelerator Lab., Batavia, IL (United States)]|[Univ. of California, Los Angeles, CA (United States)

1996-10-01T23:59:59.000Z

106

Math of Popping Bubbles in a Foam  

NLE Websites -- All DOE Office Websites (Extended Search)

Math of Popping Math of Popping Bubbles in a Foam Math of Popping Bubbles in a Foam Berkeley Lab researchers mathematically describe the complex evolution and disappearance of foamy bubbles May 9, 2013 | Tags: Hopper, Math & Computer Science Media Contacts: UC Berkeley: Robert Sanders, rsanders@berkeley.edu, (510) 643-6998 Berkeley Lab: Linda Vu, lvu@lbl.gov, (510) 495-2404 Written By Robert Sanders Bubble baths and soapy dishwater, the refreshing head on a beer and the luscious froth on a cappuccino. All are foams, beautiful yet ephemeral as the bubbles pop one by one. Now, two researchers from the Department of Energy's (DOE's) Lawrence Berkeley National Laboratory (Berkeley Lab) and the University of California, Berkeley have described mathematically the successive stages in the complex evolution and disappearance of foamy

107

Dynamics of laser?induced cavitation bubbles  

Science Journals Connector (OSTI)

Bubbles in liquids can be formed in a variety of ways. A convenient method to produce a single bubble in a liquid is to focus a short pulse of laser light into the liquid. A bright light?emitting plasma of obviously high pressure expands forming a gas?vapor bubble. After some time bubble expansion stops at some maximum radius. From thereon the bubble starts to shrink driven by the ambient pressure and leading to a violent collapse possibly followed by rebounds. A mathematical model that describes the evolution of such a laser?induced cavitation bubble is presented. The model takes into account heat conduction of the liquid and gas phases evaporation and condensation processes of the liquid phase gas diffusion from the liquid into the bubble and compressibility of the liquid. A reasonable comparison of theoretical results with experimental data is obtained. [Work partially supported by Internationales Bro des BMBF (Contract RUS?133?1997) and European Commission (INCO?Copernicus Contract ERBIC15CT980141).

Iskander Akhatov; Nailya Vakhitova; Kamil Zakirov; Robert Mettin; Olgert Lindau; Werner Lauterborn

1999-01-01T23:59:59.000Z

108

Gas bubble dynamics in soft materials  

E-Print Network (OSTI)

Epstein and Plesset's seminal work on the rate of gas bubble dissolution and growth in a simple liquid is generalized to render it applicable to a gas bubble embedded in a soft elastic medium. Both the underlying diffusion equation and the expression for the gas bubble pressure were modified to allow for the non-zero shear modulus of the elastic medium. The extension of the diffusion equation results in a trivial shift (by an additive constant) in the value of the diffusion coefficient, and does not change the form of the rate equations. But the use of a Generalized Young-Laplace equation for the bubble pressure resulted in significant differences on the dynamics of bubble dissolution and growth, relative to a simple liquid medium. Depending on whether the salient parameters (solute concentration, initial bubble radius, surface tension, and shear modulus) lead to bubble growth or dissolution, the effect of allowing for a non-zero shear modulus in the Generalized Young-Laplace equation is to speed up the rate ...

Solano-Altamirano, J M; Goldman, Saul

2014-01-01T23:59:59.000Z

109

MAGNETIC TOPOLOGY OF BUBBLES IN QUIESCENT PROMINENCES  

SciTech Connect

We study a polar-crown prominence with a bubble and its plume observed in several coronal filters by the SDO/AIA and in H{alpha} by the MSDP spectrograph in Bialkow (Poland) to address the following questions: what is the brightness of prominence bubbles in EUV with respect to the corona outside of the prominence and the prominence coronal cavity? What is the geometry and topology of the magnetic field in the bubble? What is the nature of the vertical threads seen within prominences? We find that the brightness of the bubble and plume is lower than the brightness of the corona outside of the prominence, and is similar to that of the coronal cavity. We constructed linear force-free models of prominences with bubbles, where the flux rope is perturbed by inclusion of parasitic bipoles. The arcade field lines of the bipole create the bubble, which is thus devoid of magnetic dips. Shearing the bipole or adding a second one can lead to cusp-shaped prominences with bubbles similar to the observed ones. The bubbles have complex magnetic topology, with a pair of coronal magnetic null points linked by a separator outlining the boundary between the bubble and the prominence body. We conjecture that plume formation involves magnetic reconnection at the separator. Depending on the viewing angle, the prominence can appear either anvil-shaped with predominantly horizontal structures, or cusp-shaped with predominantly vertical structuring. The latter is an artifact of the alignment of magnetic dips with respect to the prominence axis and the line of sight.

Dudik, J. [DAPEM, Faculty of Mathematics Physics and Computer Science, Comenius University, Mlynska Dolina F2, 84248 Bratislava (Slovakia); Aulanier, G.; Schmieder, B. [Observatoire de Paris, LESIA, UMR 8109 (CNRS), F-92195 Meudon Principal Cedex (France); Zapior, M. [Astronomical Institute, University of Wroclaw, Kopernika 11, 51622 Wroclaw (Poland); Heinzel, P., E-mail: dudik@fmph.uniba.sk [Astronomical Institute of the Academy of Sciences of the Czech Republic, Fricova 298, 25165 Ondrejov (Czech Republic)

2012-12-10T23:59:59.000Z

110

Microfluidics Formation of Bubbles in a Multisection Flow-Focusing  

E-Print Network (OSTI)

Microfluidics Formation of Bubbles in a Multisection Flow-Focusing Junction Michinao Hashimoto the stable formation of trains of mono-, bi-, and tri-disperse bubbles in microfluidic flow- focusing (FF-assembly through the patterns of flow created by the bubbles. 1.1 Bubbles and Droplets in Microfluidics

Prentiss, Mara

111

Asymmetric bubble disconnection: persistent vibration evolves into smooth contact  

E-Print Network (OSTI)

Asymmetric bubble disconnection: persistent vibration evolves into smooth contact Konstantin S bubble provides a simple example of this process. An initial asymmetry in the shape of the bubble neck that subsequently break-up into many pieces [1]. Bubble disconnection is a simpler ver- sion of the same collapse

Zhang, Wendy

112

Spatiotemporal dynamics of acoustic cavitation bubble clouds  

Science Journals Connector (OSTI)

...bubble velocity and the bubble density. A more detailed...1996). A linear stability analysis based on this...monodisperse distribution of bubbles is unstable in the presence...during the process of bubble generation with lim...A2 = N/N0. (d) Stability analysis An analytic...

1999-01-01T23:59:59.000Z

113

Diffusive Accumulation of Methane Bubbles in Seabed  

E-Print Network (OSTI)

We consider seabed bearing methane bubbles. In the absence of fractures the bubbles are immovably trapped in a porous matrix by surface tension forces; therefore the dominant mechanism of transfer of gas mass becomes the diffusion of gas molecules through the liquid. The adequate description of this process requires accounting "other-than-normal" (non-Fickian) diffusion effects, thermodiffusion and gravity action. We evaluate the diffusive flux of aqueous methane and predict the possibility of existence of bubble mass accumulation zones (which can appear independently from the presence/absence of hydrate stability zone) and effect of non-Fickian drift on the capacity of shallow and deep methane-hydrate deposits.

Goldobin, D S; Levesley, J; Lovell, M A; Rochelle, C A; Jackson, P; Haywood, A; Hunter, S; Rees, J

2010-01-01T23:59:59.000Z

114

Chamber Clearing First Principles Modeling  

SciTech Connect

LIFE fusion is designed to generate 37.5 MJ of energy per shot, at 13.3 Hz, for a total average fusion power of 500 MW. The energy from each shot is partitioned among neutrons ({approx}78%), x-rays ({approx}12%), and ions ({approx}10%). First wall heating is dominated by x-rays and debris because the neutron mean free path is much longer than the wall thickness. Ion implantation in the first wall also causes damage such as blistering if not prevented. To moderate the peak-pulse heating, the LIFE fusion chamber is filled with a gas (such as xenon) to reduce the peak-pulse heat load. The debris ions and majority of the x-rays stop in the gas, which re-radiates this energy over a longer timescale (allowing time for heat conduction to cool the first wall sufficiently to avoid damage). After a shot, because of the x-ray and ion deposition, the chamber fill gas is hot and turbulent and contains debris ions. The debris needs to be removed. The ions increase the gas density, may cluster or form aerosols, and can interfere with the propagation of the laser beams to the target for the next shot. Moreover, the tritium and high-Z hohlraum debris needs to be recovered for reuse. Additionally, the cryogenic target needs to survive transport through the gas mixture to the chamber center. Hence, it will be necessary to clear the chamber of the hot contaminated gas mixture and refill it with a cool, clean gas between shots. The refilling process may create density gradients that could interfere with beam propagation, so the fluid dynamics must be studied carefully. This paper describes an analytic modeling effort to study the clearing and refilling process for the LIFE fusion chamber. The models used here are derived from first principles and balances of mass and energy, with the intent of providing a first estimate of clearing rates, clearing times, fractional removal of ions, equilibrated chamber temperatures, and equilibrated ion concentrations for the chamber. These can be used to scope the overall problem and provide input to further studies using fluid dynamics and other more sophisticated tools.

Loosmore, G

2009-06-09T23:59:59.000Z

115

Bubble Trouble: Off-Line De-Anonymization of Bubble Forms Joseph A. Calandrino, William Clarkson and Edward W. Felten  

E-Print Network (OSTI)

Bubble Trouble: Off-Line De-Anonymization of Bubble Forms Joseph A. Calandrino, William Clarkson and Edward W. Felten Department of Computer Science Princeton University Abstract Fill-in-the-bubble forms of the forms comes with an implicit assumption that individuals' bubble markings them- selves

Felten, Edward W.

116

Circle Track Magazine Project GREEN: New Smyrna Track Testing...  

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

Circle Track Magazine Project GREEN: New Smyrna Track Testing Results Circle Track Magazine Project GREEN: New Smyrna Track Testing Results Forrest Jehlik's presentation on GREEN...

117

Source mergers and bubble growth during reionization  

Science Journals Connector (OSTI)

......have enhanced photon production due to star formation...a change in photon production over time for any given...extending previous methods, photon production histories, bubble...historical event when hydrogen in the universe transformed......

J. D. Cohn; Tzu-Ching Chang

2007-01-01T23:59:59.000Z

118

Are there really bubbles in oil prices?  

Science Journals Connector (OSTI)

Abstract The aim of this paper is to identify bubbles in oil prices by using the exponential fitting methodology proposed by Watanabe etal. (2007) [28,29]. We use the daily US dollar closing crude oil prices of West Texas Intermediate (WTI) covering the 1986:01:022013:07:09 and the Brent for the 1987:05:202013:07:09 periods. The distinguishing feature of this study from the previous studies is that this is the first study in the literature showing the existence of bubbles in crude oil prices. We found that there are four distinct periods of persistent bubbles in the crude oil prices since 1986. Two of these persistent bubbles are before 2000 and two of them are after 2000. We conclude that further research is needed to understand better how futures markets may impact the oil price formation.

Mehmet Balcilar; Zeynel Abidin Ozdemir; Hakan Yetkiner

2014-01-01T23:59:59.000Z

119

aBubbleTree? Thomas H. Parker  

E-Print Network (OSTI)

on Rn \\ {0}. That limit loses energy. A bubble tree is a way of recovering the lost energy by keepingaBubbleTree? Thomas H. Parker 666 NOTICES OF THE AMS VOLUME 50, NUMBER 6 Some of the most important for functions u on a domain in R2, which arises as the variational equation of the energy (2) E(u) = |du|2 dvol

Parker, Thomas H.

120

Acoustic Energy Storage in Single Bubble Sonoluminescence  

E-Print Network (OSTI)

Single bubble sonoluminescence is understood in terms of a shock focusing towards the bubble center. We present a mechanism for significantly enhancing the effect of shock focusing, arising from the storage of energy in the acoustic modes of the gas. The modes with strongest coupling are not spherically symmetric. The storage of acoustic energy gives a framework for understanding how light intensities depend so strongly on ambient gases and liquids and suggests that the light intensities of successive flashes are highly correlated.

Michael P. Brenner; Sascha Hilgenfeldt; Detlef Lohse; Rodolfo R. Rosales

1996-05-07T23:59:59.000Z

Note: This page contains sample records for the topic "bubble chamber tracks" 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

E-Print Network 3.0 - antistrange particle production Sample...  

NLE Websites -- All DOE Office Websites (Extended Search)

-40 Baryon Worksheets 41-44 Meson Worksheets 45-48 Elementary Particle Reactions 49-54 Bubble Chamber Track Source: Quigg, Chris - Theoretical Physics, Fermi National...

122

The "Mortgage Consensus and the Housing Bubble: Revisiting the Post-Fordism Debate  

E-Print Network (OSTI)

Consensus and the Housing Bubble Wyly, Elvin, and JasonConsensus and the Housing Bubble References Amin, Ash.Consensus and the Housing Bubble Jones-Correa, Michael.

Flores Jr., Luis

2014-01-01T23:59:59.000Z

123

Rising Jet-Inflated Bubbles in Clusters of Galaxies  

E-Print Network (OSTI)

We conduct three-dimensional axisymmetric hydrodynamical numerical simulations of bubble evolution in clusters of galaxies. We inflate bubbles using slow, massive jets with a wide opening angle, and follow their evolution as they rise through the intra-cluster medium (ICM). We find that these jet-inflated bubbles are quite stable, and can reach large distances in the cluster while still maintaining their basic structure. The stability of the jet-inflated bubble comes mainly from the dense shell that forms around it during it's inflation stage, and from the outward momentum of the bubble and the shell. On the contrary, bubbles that are inserted by hand onto the grid and not inflated by a jet, i.e., an artificial bubble, lack these stabilizing factors, therefore, they are rapidly destroyed. The stability of the jet-inflated bubble removes the demand for stabilizing magnetic fields in the bubble.

Sternberg, Assaf

2008-01-01T23:59:59.000Z

124

Rising Jet-Inflated Bubbles in Clusters of Galaxies  

E-Print Network (OSTI)

We conduct two-dimensional axisymmetric (referred to as 2.5D) hydrodynamical numerical simulations of bubble evolution in clusters of galaxies. We inflate bubbles using slow, massive jets with a wide opening angle, and follow their evolution as they rise through the intra-cluster medium (ICM). We find that these jet-inflated bubbles are quite stable, and can reach large distances in the cluster while still maintaining their basic structure. The stability of the jet-inflated bubble comes mainly from the dense shell that forms around it during it's inflation stage, and from the outward momentum of the bubble and the shell. On the contrary, bubbles that are inserted by hand onto the grid and not inflated by a jet, i.e., an artificial bubble, lack these stabilizing factors, therefore, they are rapidly destroyed. The stability of the jet-inflated bubble removes the demand for stabilizing magnetic fields in the bubble.

Assaf Sternberg; Noam Soker

2008-05-15T23:59:59.000Z

125

Recent Advances in Chamber Science and Technology  

E-Print Network (OSTI)

Recent Advances in Chamber Science and Technology Mohamed Abdou April 8, 2002ISFNT-6 San Diego, USA #12;Recent Advances in Chamber Science & Technology OutlineOutline · Highlights of Major World - Experiments - Analysis & Design #12;Highlights of Major World Programs on Chamber (Blanket) Technology

Abdou, Mohamed

126

Mercury Chamber NF-IDS Meeting  

E-Print Network (OSTI)

-Battelle for the U.S. Department of Energy Mercury Chamber Update Oct 2011 Starting Point: Coil and Shielding Concept IDS120H #12;3 Managed by UT-Battelle for the U.S. Department of Energy Mercury Chamber Update Oct 2011 · Penetrations (ports) into chamber ­ Nozzle ­ Hg drains (overflow and maintenance) ­ Vents (in and out) ­ Beam

McDonald, Kirk

127

NIF Target Chamber Dedicated | National Nuclear Security Administratio...  

NLE Websites -- All DOE Office Websites (Extended Search)

Dedicated NIF Target Chamber Dedicated June 11, 1999 NIF Target Chamber Dedicated Livermore, CA Secretary Richardson dedicates the National Ignition Facility target chamber at...

128

Nonlinear dynamics of bubbles with surfactants  

Science Journals Connector (OSTI)

Hugh Flynn pioneered many aspects of cavitational phenomena. He even got a patent on the idea that large bubble collapse could be used for inertially induced thermonuclear fusion. Some researchers currently working in the area of sonoluminescence are asking the same questions. One of the key requirements for confining the energy in the collapse of a bubble is maintaining spherical symmetry. Instabilities such as RayleighTaylor and KelvinHelmholtz can compromise this requirement. Therefore it is useful to examine the role of surfactants in conferring stability on the collapse of bubbles. Codes that have recently permitted the description of superoscillations of liquid drops with surfactants in air [e.g. Apfel et al. Phys. Rev. Lett. 78 19121915 (1997)] can be applied to the case of a bubble in a liquid. Of particular interest are insoluble surfactants such as bovine serum albumin which do not reduce the surface tension that much but which greatly increase the surface damping. The role of damping in discouraging or delaying instability of collapsing bubbles in an acoustic field will be presented. [Work supported in part by NASA through Contract No. 958722 managed by the Jet Propulsion Laboratory.] ?

Robert Apfel; Xiaohui Chen; Jeffrey Ketterling

1998-01-01T23:59:59.000Z

129

Construction and test of high precision drift-tube (sMDT) chambers for the ATLAS muon spectrometer  

E-Print Network (OSTI)

For the upgrade of the ATLAS muon spectrometer in March 2014 new muon tracking chambers (sMDT) with drift-tubes of 15 mm diameter, half of the value of the standard ATLAS Monitored Drift-Tubes (MDT) chambers, and 10~$\\mu$m positioning accuracy of the sense wires have been constructed. The new chambers are designed to be fully compatible with the present ATLAS services but, with respect to the previously installed ATLAS MDT chambers, they are assembled in a more compact geometry and they deploy two additional tube layers that provide redundant rack information. The chambers are composed of 8 layers of in total 624 aluminium drift-tubes. The assembly of a chamber is completed within a week. A semi-automatized production line is used for the assembly of the drift-tubes prior to the chamber assembly. The production procedures and the quality control tests of the single components and of the complete chambers will be discussed. The wire position in the completed chambers have been measured by using a coordinate me...

Nowak, Sebastian; Kroha, Hubert; Schwegler, Philipp; Sforza, Federico

2014-01-01T23:59:59.000Z

130

Construction and test of high precision drift-tube (sMDT) chambers for the ATLAS muon spectrometer  

E-Print Network (OSTI)

For the upgrade of the ATLAS muon spectrometer in March 2014 new muon tracking chambers (sMDT) with drift-tubes of 15 mm diameter, half of the value of the standard ATLAS Monitored Drift-Tubes (MDT) chambers, and 10~$\\mu$m positioning accuracy of the sense wires have been constructed. The new chambers are designed to be fully compatible with the present ATLAS services but, with respect to the previously installed ATLAS MDT chambers, they are assembled in a more compact geometry and they deploy two additional tube layers that provide redundant rack information. The chambers are composed of 8 layers of in total 624 aluminium drift-tubes. The assembly of a chamber is completed within a week. A semi-automatized production line is used for the assembly of the drift-tubes prior to the chamber assembly. The production procedures and the quality control tests of the single components and of the complete chambers will be discussed. The wire position in the completed chambers have been measured by using a coordinate measuring machine.

Sebastian Nowak; Oliver Korner; Hubert Kroha; Philipp Schwegler; Federico Sforza

2014-07-01T23:59:59.000Z

131

Fermilab Art Gallery  

NLE Websites -- All DOE Office Websites (Extended Search)

In Search of Meaning project began through inspiration. On first viewing images from Bubble Chamber experiments I was drawn to the elegant nature of the bubble tracks as they cut...

132

Track 3: Exposure Hazards  

Energy.gov (U.S. Department of Energy (DOE))

ISM Workshop Presentations Knoxville Convention Center, Knoxville, TN August 2009 Track 3: Exposure Hazards

133

Cycle Track Lessons Learned  

E-Print Network (OSTI)

Cycle Track Lessons Learned #12;Presentation Overview · Bicycling trends · Cycle track lessons learned · What is a "Cycle track"? · Essential design elements of cycle tracks Separation Width Crossing driveways & low-volume streets Signalized intersections #12;Trend in kilometers cycled per year

Bertini, Robert L.

134

Track 9: Quality Assurance  

Energy.gov (U.S. Department of Energy (DOE))

ISM Workshop Presentations Knoxville Convention Center, Knoxville, TN August 2009 Track 9: Quality Assurance

135

Free energy of spherical QCD bubbles  

Science Journals Connector (OSTI)

We discuss the free energy of spherical bubbles of hadronic (quark-gluon plasma) matter in metastable equilibrium in a quark-gluon plasma (hadronic matter) at a fixed temperature TTc). We derive an expression for the effective interface tension written in terms of the bubble's radius R, namely, ?(R)=?(?)[1+2dR], where d is a parameter related to the surface entropy of a planar interface. We argue that this formula should be valid in the case of expanding macroscopic bubbles as well. We also estimate the value of the contribution of curvature to the free energy and explore the consequences of such a radius dependence on the dynamics of the cosmological phase transition.

K. Kajantie; J. Potvin; K. Rummukainen

1993-04-01T23:59:59.000Z

136

Gravitational waves from cosmic bubble collisions  

E-Print Network (OSTI)

Cosmic bubbles are nucleated through the quantum tunneling process. After nucleation they would expand and undergo collisions with each other. In this paper, we focus in particular on collisions of two equal-sized bubbles and compute gravitational waves emitted from the collisions. First, we study the mechanism of the collisions by means of a real scalar field and a quartic potential of the field. Then, using this scalar field model, we compute gravitational waves from the collisions in a straightforward manner. In the quadrupole approximation, time-domain gravitational waveforms are directly obtained by integrating the energy-momentum tensors over the volume of the wave sources, where the energy-momentum tensors are expressed in terms of the scalar field, the local geometry and the potential; therefore, containing all information about the bubble collisions. We present gravitational waveforms emitted during (i) the initial-to-intermediate stage of strong collisions and (ii) the final stage of weak collisions...

Kim, Dong-Hoon; Lee, Wonwoo; Yang, Jongmann; Yeom, Dong-han

2014-01-01T23:59:59.000Z

137

Investigation of long drift chambers for a nucleon-decay detector  

SciTech Connect

The use of long drift chambers for a nucleon-decay detector is discussed as a means of achieving a detector with very fine tracking, but with a modest number of readout channels. Strategies for reducing the attenuation of drifting electrons are considered, particularly the necessity of shaping the electric field to reduce the effects of diffusion and of nearby grounded conductors. Measured results are presented for a chamber with 1 cm drift gap and 50 cm maximum drift distance. The measured attenuation is 12%.

Price, L.E.; Dawson, J.; Ayres, D.; Denis, R.S.

1981-01-01T23:59:59.000Z

138

On acoustic cavitation of slightly subcritical bubbles Anthony Harkin  

E-Print Network (OSTI)

On acoustic cavitation of slightly subcritical bubbles Anthony Harkin Department of Mathematics, such as submicron air bubbles in water, where the natural oscilla- tion frequencies are high. In contrast, when

Kaper, Tasso J.

139

Electrical capacitance volume tomography (ECVT) applied to bubbling fluid beds  

SciTech Connect

These presentation visuals illustrate the apparatus and method for applying Electrical Capacitance Volume Tomography (ECVT) to bubbling fluid beds to their solid fraction and bubble properties. Results are compared to estimated values.

Weber, J., Mei, J.

2012-01-01T23:59:59.000Z

140

An Inversion of Acoustical Attenuation Measurements to Deduce Bubble Populations  

Science Journals Connector (OSTI)

Measurement of natural bubble populations is required for many areas of ocean science. Acoustical methods have considerable potential for achieving this goal because bubbles scatter sound strongly close to their natural frequency, which depends ...

H. Czerski

2012-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "bubble chamber tracks" 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

Stability of an overheated liquid containing vapor-gas bubbles  

Science Journals Connector (OSTI)

The problem of the stability of an overheated liquid containing bubbles of an insoluble gas is considered. The critical conditions for the masses of gas bubbles, their radii, and volume concentrations are ... sys...

V. Sh. Shagapov; V. V. Koledin

2013-09-01T23:59:59.000Z

142

Stability of an expanding bubble in the Rayleigh model  

Science Journals Connector (OSTI)

A bubble expands adiabatically in an incompressible, inviscid liquid. The variation of its radiusR with time is given by the Rayleighs equation. We find that the bubble is stable at the equilibrium point in this...

B. B. Chakraborty; Dinesh Khattar

1999-11-01T23:59:59.000Z

143

Stability of a class of neutral vacuum bubbles  

E-Print Network (OSTI)

A model that gives rise to vacuum bubbles is considered where the domain wall field interacts with another real scalar field, resulting in the formation of domain ribbons within the host domain wall. Ribbon-antiribbon annihilations produce elementary bosons whose mass inside the wall is different from the mass in vacuum. Two cases are considered, where the bosons get trapped either within the bubble wall or the bosons get trapped within the vacuum enclosed by the bubble. The bosonic (meta)stabilization effect on the bubble is examined in each case. It is found that when the bosons become trapped within the bubble wall, the stabilization mechanism lasts for only a limited amount of time, and then the bubble undergoes unchecked collapse. However, when the bosons become trapped within the bubble's interior volume, the bubble can be long-lived, provided that it has a sufficiently thin wall.

J. R. Morris

2013-04-16T23:59:59.000Z

144

Stabilization of bubble-liquid processes by an electric field  

Science Journals Connector (OSTI)

The stability of bubble-liquid and sedimentation processes in the presence ... processes in the case of polarizable particles or bubbles in a dielectric liquid in the presence ... In the present paper, a criterio...

V. A. Naletova

145

Stability of a class of neutral vacuum bubbles  

E-Print Network (OSTI)

A model that gives rise to vacuum bubbles is considered where the domain wall field interacts with another real scalar field, resulting in the formation of domain ribbons within the host domain wall. Ribbon-antiribbon annihilations produce elementary bosons whose mass inside the wall is different from the mass in vacuum. Two cases are considered, where the bosons get trapped either within the bubble wall or the bosons get trapped within the vacuum enclosed by the bubble. The bosonic (meta)stabilization effect on the bubble is examined in each case. It is found that when the bosons become trapped within the bubble wall, the stabilization mechanism lasts for only a limited amount of time, and then the bubble undergoes unchecked collapse. However, when the bosons become trapped within the bubble's interior volume, the bubble can be long-lived, provided that it has a sufficiently thin wall.

Morris, J R

2013-01-01T23:59:59.000Z

146

Three-dimensional reconstruction of bubble distribution in two-phase bubbly flows with the dynamic programming method  

E-Print Network (OSTI)

A three-dimensional bubble reconstruction method is proposed in this thesis to analyze two-phase bubbly flows. Gas/liquid two-phase flows have important roles in the nuclear and chemical industries and other engineering fields...

Furukawa, Toru

2002-01-01T23:59:59.000Z

147

Heart-shaped bubbles rising in anisotropic liquids Chunfeng Zhou  

E-Print Network (OSTI)

Heart-shaped bubbles rising in anisotropic liquids Chunfeng Zhou Department of Chemical of an unusual inverted-heart shape for bubbles rising in an anisotropic micellar solution. We explain the bubble heart or a spade a . The upper sur- face has sloped shoulders that join in a point. The bottom

Feng, James J.

148

Bubble growth during decompression of magma: experimental and theoretical investigation  

E-Print Network (OSTI)

Bubble growth during decompression of magma: experimental and theoretical investigation N.G. Lensky, Israel Abstract A model of bubble growth during decompression of supersaturated melt was developed in order to explore the conditions for preservation of gas overpressure in bubbles or for maintaining

Lyakhovsky, Vladimir

149

BUBBLE RECOGNITION FROM IMAGE SEQUENCES Dachuan Cheng and Hans Burkhardt  

E-Print Network (OSTI)

BUBBLE RECOGNITION FROM IMAGE SEQUENCES Da­chuan Cheng and Hans Burkhardt Institute for Pattern In this paper, we present an algorithm which can automatically recognize vapor bubbles in a seething liquid from and the bubble recognition. In the first step, the technique for auto­focus was applied for the determination

150

AUTOMATIC BUBBLE NUCLEATION SITES IDENTIFICATION IN AN IMAGE SEQUENCE  

E-Print Network (OSTI)

AUTOMATIC BUBBLE NUCLEATION SITES IDENTIFICATION IN AN IMAGE SEQUENCE Da-chuan CHENG*, Hans an algorithm which can identify the nucleation sites of vapour bubbles in an image sequence based on a template which is a bubble sub-image extracted by the user. These images are taken with a speed of one thousand

151

Bubble Coalescence DOI: 10.1002/anie.201006552  

E-Print Network (OSTI)

Bubble Coalescence DOI: 10.1002/anie.201006552 Anomalous Stability of Carbon Dioxide in pH-Controlled Bubble Coalescence** Rico F. Tabor, Derek Y. C. Chan, Franz Grieser, and Raymond R. Dagastine* Gas bubbles are formed as cavities in liquids, their pressure, shape, and deformability determined

Chan, Derek Y C

152

Homogeneous bubble nucleation in rhyolitic melt: Experiments and nonclassical theory  

E-Print Network (OSTI)

Homogeneous bubble nucleation in rhyolitic melt: Experiments and nonclassical theory H. M eruptions. The first and most critical step in degassing is the nucleation of gas bubbles, which requires inferred from bubble nucleation experiments in silicate melts are, however, lower than direct macroscopic

Gonnermann, Helge

153

Bubble growth in rhyolitic melt Yang Liu, Youxue Zhang *  

E-Print Network (OSTI)

Bubble growth in rhyolitic melt Yang Liu, Youxue Zhang * The Department of Geological Sciences June 2000; accepted 8 June 2000 Abstract We report experimental data of bubble growth in natural rhyolitic melt with 1.4^2.0 wt% initial total H2O at 0.1 MPa and 500^600³C. Growth of many bubbles

Zhang, Youxue

154

AUTOMATIC BUBBLE NUCLEATION SITES IDENTIFICATION IN AN IMAGE SEQUENCE  

E-Print Network (OSTI)

AUTOMATIC BUBBLE NUCLEATION SITES IDENTIFICATION IN AN IMAGE SEQUENCE Da­chuan CHENG*, Hans an algorithm which can identify the nucleation sites of vapour bubbles in an image sequence based on a template which is a bubble sub­image extracted by the user. These images are taken with a speed of one thousand

155

Bubble Sort: An Archaeological Algorithmic Analysis Owen Astrachan 1  

E-Print Network (OSTI)

Bubble Sort: An Archaeological Algorithmic Analysis Owen Astrachan 1 Computer Science Department- variably mention bubble sort in discussions of elemen- tary sorting algorithms. We trace the history of bub of bubble sort from books and courses. However, sentiments for exclusion are sup- ported by Knuth [17], "In

Astrachan, Owen

156

Experiments on a twodimensional laminar separation bubble  

Science Journals Connector (OSTI)

...disturbances in the bubble was found to be exponen...simulation and linear stability calculations), where...two-dimensional laminar separation bubble 3205 This work was supported...transitional separation bubbles. TRITA-MEK tech...1993 Experiments on the stability of Tollmien{Schlichting...

2000-01-01T23:59:59.000Z

157

On Steady-State Bubbles Generated by Taylor Instability  

Science Journals Connector (OSTI)

...steady motion of a long bubble rising through an infinite...that the speed U of the bubble can also be prescribed. However, a criterion of stability singles out the unique physically...maximizes the velocity of the bubble. With the aid of a difference-differential...

1957-01-01T23:59:59.000Z

158

The evolution of an axisymmetric Stokes bubble with volumetric change  

E-Print Network (OSTI)

is the unit outward normal at the bubble boundary and ø is the surface tension. The interfacial kinematic volume is changed. Linear stability analysis shows that an expanding spherical bubble is stable, while are identified. We present the equations of the bubble motion in Section 2, and perform a linear stability

159

Neutron-chamber detectors and applications  

SciTech Connect

Detector applications in Nuclear Safeguards and Waste Management have included measuring neutrons from fission and (alpha,n) reactions with well-moderated neutron proportional counters, often embedded in a slab of polyethylene. Other less-moderated geometries are useful for detecting both bare and moderated fission-source neutrons with good efficiency. The neutron chamber is an undermoderated detector design comprising a large, hollow, polyethylene-walled chamber containing one or more proportional counters. Neutron-chamber detectors are relatively inexpensive; can have large apertures, usually through a thin chamber wall; and offer very good detection efficiency per dollar. Neutron-chamber detectors have also been used for monitoring vehicles and for assaying large crates of transuranic waste. Our Monte Carlo calculations for a new application (monitoring low-density waste for concealed plutonium) illustrate the advantages of the hollow-chamber design for detecting moderated fission sources. 9 refs., 6 figs., 2 tabs.

Fehlau, P.E.; Atwater, H.F.; Coop, K.L.

1990-01-01T23:59:59.000Z

160

Final Topical Report, ''Multi-Dimensional Analysis of the Forced Bubble Dynamics Associated with Bubble Fusion Phenomena''  

SciTech Connect

A new adaptive grid, 3-D FEM hydrodynamic shock (ie, HYDRO )code called PHASTA-2C has been developed and used to investigate bubble implosion phenomena leading to ultra-high temperatures and pressures. In particular, it was shown that nearly spherical bubble compressions occur during bubble implosions and the predicted conditions associated with a recent ORNL Bubble Fusion experiment [Taleyarkhan et al, Science, March, 2002] are consistent with the occurrence of D/D fusion.

Richard T. Lahey, Jr. - PI Kenneth E. Jansen - COPI Sunitha Nagrath - Graduate Student

2002-12-02T23:59:59.000Z

Note: This page contains sample records for the topic "bubble chamber tracks" 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

Nonlinear Acoustic Phenomena in Subsurface Bubble Layers and its Usage for Bubble Measurements  

Science Journals Connector (OSTI)

This paper contains a brief review of our recent theoretical and experimental investigations of nonlinear acoustic phenomena in sub-surface bubble layers produced by breaking waves and results concerning linear a...

A. M. Sutin

1992-01-01T23:59:59.000Z

162

Fluidized wall for protecting fusion chamber walls  

DOE Patents (OSTI)

Apparatus for protecting the inner wall of a fusion chamber from microexplosion debris, x-rays, neutrons, etc. produced by deuterium-tritium (DT) targets imploded within the fusion chamber. The apparatus utilizes a fluidized wall similar to a waterfall comprising liquid lithium or solid pellets of lithium-ceramic, the waterfall forming a blanket to prevent damage of the structural materials of the chamber.

Maniscalco, James A. (Danville, CA); Meier, Wayne R. (Livermore, CA)

1982-01-01T23:59:59.000Z

163

Hydrodynamic simulations of an imploding bubble  

Science Journals Connector (OSTI)

Numerical solutions of the hydrodynamicequations of motion for a collapsing bubble have shown that shock waves can be generated during the collapse. It has been shown that these shock waves can supply and remove energy from the center of the bubble rapidly enough to account for the picosecond duration flashes that are observed experimentally. However these solutions have not included energy loss mechanisms so the calculated temperatures are excessively high. More accurate numerical simulations are discussed that (i) model the shocked gas as a plasma with distinct ion electron and radiation temperatures and (ii) include energy losses by ion conduction electron conduction and radiant energy transport. As an example a sonoluminescing bubble of deuterium is considered whose sinusoidal driving amplitude is enhanced by a small pressure spike. Although the calculated radiation and electron temperatures are only tens of eV the calculated peak ion temperatures are a couple hundred eV (?2?000?000 K) which may be sufficient to initiate a very small number of thermonuclear reactions at the center of the bubble. [Work performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract No. W?7405?Eng?48.

William C. Moss; Douglas B. Clarke; John W. White; David A. Young

1996-01-01T23:59:59.000Z

164

Electromagnetic bubbles: subcycle near-femtosecond  

E-Print Network (OSTI)

-femtosecond or even sub- femtosecond) subcycle (nonoscillating) electromagnetic solitons [EM bubbles (EMB's)] in a gas electromagnetic pulses of a nonoscillating nature, i.e., subcycle (almost unipolar) half-cycle pulses (HCP) and stron- ger (up to 1016 W/cm2 ) pulses. One of these principles is based on stimulated cascade Raman

Kaplan, Alexander

165

Inertial cavitation and singlebubble sonoluminescence  

Science Journals Connector (OSTI)

...drive-pressure amplitude increases (from the bottom to...SBSL in CokeTM glasses, wine glasses, and other...The importance of a quality three- dimensional standing...bubble is offset by the increase in the drive-pressure...experimental conditions; the quality of the resonance may...

1999-01-01T23:59:59.000Z

166

The cone and the lazy bubble: two efficient alternatives between the point cursor and the bubble cursor  

Science Journals Connector (OSTI)

We evaluated two cursor designs in the continuum between the traditional point cursor and the bubble cursor by Grossman and Balakrishnan. The lazy bubble cursor expanded to envelop the closest target when the ratio of the distances to the closest and ... Keywords: bubble cursor, dynamic cursor, target acquisition

Joona Laukkanen; Poika Isokoski; Kari-Jouko Rih

2008-04-01T23:59:59.000Z

167

Cap Bubble Drift Velocity in a Confined Test Section  

SciTech Connect

In the two-group interfacial area transport equation, bubbles are categorized into two groups, i.e., spherical/distorted bubbles as group 1 and cap/slug/churn-turbulent bubbles as group 2. The bubble rise velocities for both groups of bubbles may be estimated by the drift flux model by applying different distribution parameters and drift velocities for both groups. However, the drift velocity for group 2 bubbles is not always applicable (when the wall effect becomes important) as in the current test loop of interest where the flow channel is confined by two parallel flat walls, with a dimension of 200-mm in width and 10-mm in gap. The previous experiments indicated that no stable slug flow existed in this test section, which was designed to permit visualization of the flow patterns and bubble characteristics without the distortion associated with curved surfaces. In fact, distorted cap bubbly and churn-turbulent flow was observed. Therefore, it is essential to developed a correlation for cap bubble drift velocity in this confined flow channel. Since the rise velocity of a cap bubble depends on its size, a high-speed movie camera is used to capture images of cap bubbles to obtain the bubble size information. Meanwhile, the rise velocity of cap and elongated bubbles (called cap bubbles hereafter) is investigated by examining the captured images frame by frame. As a result, the conventional correlation of drift velocity for slug bubbles is modified and acceptable agreements between the measurements and correlation estimation are achieved.

Xiaodong Sun; Seungjin Kim; Mamoru Ishii; Frank W. Lincoln; Stephen G. Beus

2002-10-09T23:59:59.000Z

168

Do subcritical bubbles hinder first order phase transition?  

E-Print Network (OSTI)

We consider the role played by subcritical bubbles during the electroweak phase transition, estimate their average size, amplitude and formation rate taking into account the crucial role played by thermalization. We also study the influence of subcritical bubbles on the formation of critical bubbles in the thin wall regime and show that, contrary to some recent claims, subcritical bubbles do not affect the nucleation of critical bubbles in an appreciable way. From this fact we conclude that the electroweak baryogenesis scenarios associated with a first order electroweak phase transition still remain an attractive possibility.

K. Enqvist; A. Riotto; I. Vilja

1995-05-19T23:59:59.000Z

169

Bubble formation in reservoir fluids at low supersaturations  

E-Print Network (OSTI)

af Standing on Bubble Formation at R psi Supersaturation Average Bubble Frequency Curves . . ~, . . . 26 Table Title Gas Composition . 0 ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ Tests fox Bubble Frequency for Group A Tests for Bubble Frequency fox Group B Tests... fox Bubble Frequency for Gra?y C 3P 33 35 Tho ob)cot cf the ~ rcport'. " in this thesis v. to detcssdne the emerge ~e nqnire6 for She initicl gas babble te fern in . ". crude oi1~ore system~ and to det. caine ~~t sunerssturcticn could bo rec...

Wieland, Denton R

2012-06-07T23:59:59.000Z

170

Transient simulation for large scale flow in bubble columns  

Science Journals Connector (OSTI)

Abstract The transient simulation of large scale bubbly flow in bubble columns using the unsteady Reynolds averaged Navier Stokes (URANS) equations is investigated in the present paper. An extensive set of bubble forces is used with different models for the bubble induced turbulence. Criteria are given to assess the independence of the simulation time and the time step length. Using these criteria it is shown that a simulation time, time step length and mesh independent solution can be obtained for complex bubbly flows using URANS equations under certain requirements. With the obtained setup the contribution of the resolved turbulence to the total turbulence and the influence of the bubble induced turbulence modeling on the resolved turbulence is investigated. Further, it is pointed out that the virtual mass force is not negligible. The simulations are compared to data from the literature at two different superficial velocities, which cover monodisperse and polydisperse bubbly flows.

T. Ziegenhein; R. Rzehak; D. Lucas

2015-01-01T23:59:59.000Z

171

Bubble Evolution and Properties in Homogeneous Nucleation Simulations  

E-Print Network (OSTI)

We analyze the properties of naturally formed nano-bubbles in Lennard-Jones molecular dynamics simulations of liquid-to-vapor nucleation in the boiling and the cavitation regimes. The large computational volumes provide a realistic environment at unchanging average temperature and liquid pressure, which allows us to accurately measure properties of bubbles from their inception as stable, critically sized bubbles, to their continued growth into the constant speed regime. Bubble gas densities are up to 50$\\%$ lower than the equilibrium vapor densities at the liquid temperature, yet quite close to the gas equilibrium density at the lower gas temperatures measured in the simulations: The latent heat of transformation results in bubble gas temperatures up to 25$\\%$ below those of the surrounding bulk liquid. In the case of rapid bubble growth - typical for the cavitation regime - compression of the liquid outside the bubble leads to local temperature increases of up to 5$\\%$, likely significant enough to alter the...

Anglil, Raymond; Tanaka, Kyoko; Tanaka, Hidekazu

2014-01-01T23:59:59.000Z

172

meters in CO2 euthanasia chambers. All CO2 euthanasia chambers in both  

E-Print Network (OSTI)

meters in CO2 euthanasia chambers. All CO2 euthanasia chambers in both the facilities and laboratories will need flow meters. ULAR is currently in the process of identifying a cost-effective, accurate, and durable flow meter to install in all of the CO2 chambers in all of the vivaria. When a specific model

Bushman, Frederic

173

IFE Chamber Technology Testing Program In NIF and Chamber Development Test Plan Mohamed A. Abdou  

E-Print Network (OSTI)

. As ITER serves as a fusion testing facility for magnetic fusion energy (MFE) nuclear technology componentIFE Chamber Technology Testing Program In NIF and Chamber Development Test Plan Mohamed A. Abdou chamber technology testing program in NIF involoving: criteria for evaluation

Abdou, Mohamed

174

Measurements of fast neutrons by bubble detectors  

SciTech Connect

Neutron bubble detectors have been studied using Am-Be and D-D neuron sources, which give limited energy information. The Bubble Detector Spectrometer (BDS) have six different energy thresholds ranging from 10 KeV to 10 Mev. The number of bubbles obtained in each measurement is related to the dose (standardized response R) equivalent neutrons through sensitivity (b / {mu}Sv) and also with the neutron flux (neutrons per unit area) through a relationship that provided by the manufacturer. Bubble detectors were used with six different answers (0.11 b/ {mu}Sv, 0093 b/{mu}Sv, 0.14 b/{mu}Sv, 0.17 b/{mu}Sv, 0051 b/{mu}Sv). To test the response of the detectors (BDS) radiate a set of six of them with different energy threshold, with a source of Am-Be, placing them at a distance of one meter from it for a few minutes. Also, exposed to dense plasma focus Fuego Nuevo II (FN-II FPD) of ICN-UNAM, apparatus which produces fusion plasma, generating neutrons by nuclear reactions of neutrons whose energy emitting is 2.45 MeV. In this case the detectors were placed at a distance of 50 cm from the pinch at 90 Degree-Sign this was done for a certain number of shots. In both cases, the standard response is reported (Dose in {mu}Sv) for each of the six detectors representing an energy range, this response is given by the expression R{sub i}= B{sub i} / S{sub i} where B{sub i} is the number of bubbles formed in each and the detector sensitivity (S{sub i}) is given for each detector in (b / {mu}Sv). Also, reported for both cases, the detected neutron flux (n cm{sup -2}), by a given ratio and the response involves both standardized R, as the average cross section sigma. The results obtained have been compared with the spectrum of Am-Be source. From these measurements it can be concluded that with a combination of bubble detectors, with different responses is possible to measure the equivalent dose in a range of 10 to 100 {mu}Sv fields mixed neutron and gamma, and pulsed generated fusion devices.

Castillo, F.; Martinez, H. [Laboratorio de Espectroscopia, Instituto de Ciencias Fisicas, Universidad Nacional Autonoma de Mexico, Apartado Postal 48-3, 62251, Cuernavaca Morelos (Mexico); Leal, B. [Instituto de Ciencias Nucleares, Universidad Nacional Autonoma de Mexico, Apartado Postal 70-543, 04510, Ciudad Universitaria, Mexico D. F. (Mexico); Rangel, J. [Instituto de Ciencias Nucleares, Universidad Nacional Autonoma de Mexico, Apartado Postal 70-543, 04510, Ciudad Universitaria, Mexico D. F (Mexico); Reyes, P. G. [Facultad de Ciencias, Universidad Autonoma del Estado de Mexico, Instituto Literario 100, Col. Centro, 50000, Toluca Estado de Mexico (Mexico)

2013-07-03T23:59:59.000Z

175

Solar tracking apparatus  

DOE Patents (OSTI)

The invention relates to a solar tracking device which tracks the position of the sun using paired, partially-shaded photocells. Auxiliary photocells are used for initial acquisition of the sun and for the suppression of false tracking when the sun is obscured by clouds.

Hammons, Burrell E. (Albuquerque, NM)

1980-01-01T23:59:59.000Z

176

Development of a multistep parallel-plate chamber as time projection chamber end-cap or vertex detector  

SciTech Connect

In the course of development of the multistep avalanche chamber the authors have realized several multiple electrode parallel-plate devices exhibiting stable gains well in excess of 10/sup 5/ which are thus capable of detecting minimum ionizing particles. This paper presents the design and discusses the performance of a two-step parallel-plate avalanche chamber. A region of moderate electric field --the drift region where charges are released by ionizing radiation--is followed by two layers of comparable and very high field where charge multiplication occurs. Owing to the choice of the electrodes--either cross-wire meshes or parallel thick-wire grids at small pitch--the electric field is uniform over most of the gaps, and charge multiplication proceeds through a parallel-plate avalanche mode. In order to obtain a fast signal and a reduced avalanche spread in their prototypes, the authors have adopted rather narrow typical gaps of 4 mm for the first amplification region and 1 mm for the second. To avoid edge sparking, they have used either a gap increase at the edges or the insertion of thin mylar foil around the frame's edges. The last electrode in the structure, made with a printed-circuit board, is the only one equipped with electronics and is conveniently operated at ground potential. At regular intervals, four rows of pads are used to determine the coordinates of tracks in selected positions. Argon (90%) and methane (10%) comprise the gas filling.

Peisert, A.; Charpak, G.; Sauli, F.; Viezzoli, G.

1984-02-01T23:59:59.000Z

177

BUBBLE CHARACTERISTICS AND CONVECTIVE EFFECTS IN THE FLOW BOILING HEAT TRANSFER OF BINARY MIXTURES  

E-Print Network (OSTI)

BUBBLE CHARACTERISTICS AND CONVECTIVE EFFECTS IN THE FLOW BOILING HEAT TRANSFER OF BINARY MIXTURES on the bubble growth and associated heat transfer phenomena. The present work focuses on obtaining the bubble. The bubble growth is observed using a high speed camera (1000 fps) under a magnification of 290X. The bubble

Kandlikar, Satish

178

Bubble-induced dissipation under unsteady breaking waves M. Derakhti1,2  

E-Print Network (OSTI)

Bubble-induced dissipation under unsteady breaking waves M. Derakhti1,2 and J. T. Kirby1 1 Center in bubbles that rapidly evolves into a distribution of bubble sizes, which interacts with fluid turbulence and organized motions. The liquid-bubble interaction, especially in the complex two-phase bubbly flow under

Kirby, James T.

179

Engineering design of a hypobaric plant growth chamber  

E-Print Network (OSTI)

plants with the chamber in place and removed. With the chamber removed, PAR levels were recorded as 461 []mol m? s?; inside the complete chamber the level decreased to 408 []mol m? s?, a difference of 11.5%....

Purswell, Joseph Lawrence

2002-01-01T23:59:59.000Z

180

Virtual Design of Stirling Engine Combustion Chamber  

Science Journals Connector (OSTI)

The paper deals with the designing of a combustion chamber of the Stirling engine using the CFD approach. Virtual prototypes enabled ... . The presented results help to increase the Stirling engine efficiency tog...

Z. Kaplan; P. Novotn; V. Pt?k

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "bubble chamber tracks" 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

Manufacturing and qualification of UHV chambers  

Science Journals Connector (OSTI)

Vacuum chambers or vacuum components that are widespread in research and in industry must fulfill high degrees of cleanliness, especially if they are required for ultra-high-vacuum (UHV) applications. It is shown...

F. Pink; G. Schmidt

2004-03-01T23:59:59.000Z

182

Critical angle refractometry and sizing of bubble clouds  

Science Journals Connector (OSTI)

The principle of the critical angle refractometry and sizing technique is extended to characterize the size distribution and the mean refractive index of clouds of bubbles. For a...

Onofri, Fabrice; Krysiek, Mariusz; Mroczka, Janusz

2007-01-01T23:59:59.000Z

183

Bubble rise phenomena in various non-Newtonian fluids.  

E-Print Network (OSTI)

??"The bubble rise characteristic is very important for the design of heat and masss transfer operations in chemical, biochemical, environmental, and food processing industries. The (more)

Hassan, N. M. S.

2011-01-01T23:59:59.000Z

184

Bubble Migration in Pore Networks of Uniform Geometry.  

E-Print Network (OSTI)

??The behavior of bubbles migrating in porous media is a critical factor in several soil remediation operations such as in situ air sparging, supersaturated water (more)

Ghasemian, Saloumeh

2012-01-01T23:59:59.000Z

185

Gas-vapor bubble dynamics in therapeutic ultrasound.  

E-Print Network (OSTI)

??In applications of therapeutic ultrasound such as shock wave lithotripsy (SWL) and high-intensity focused ultrasound (HIFU), cavitation and the associated bubble dynamics play an important (more)

Kreider, Wayne, 1971-

2008-01-01T23:59:59.000Z

186

Single Bubble SonoLuminescence of Particles model  

E-Print Network (OSTI)

The Single Bubble SonoLuminescence is a phenomenon where the vapor bubble trapped in a liquid collapse by emitting of a light. It is very known that the temperature inside the bubble depends on the radius, during the collapse, the temperature can reach thousands of Kelvins and that the light would be emitted by radiation of the ionized gas inside the bubble. So, studies show that in certain cases neither an imploding shock nor a plasma has been observed and the temperature is not high enough to explain the spectrum observed. The Single Bubble SonoLuminescence remains a subject of study. For this study we consider the bubble as a box where the free particles (particularly electrons) stemming from the molecules dissociation, are are trapped and confined within the bubble. The confinement allows the particles to acquire some energy during the collapse which they lose in the form of light and also to be considered to bind to the bubble as an electron is bound to the nucleus in an atom. So, with regard to the bubble the energy of the particles can be considered to quantify, and with the quantum theory, by putting some hypotheses, their energy is determined well. The energy is physically acceptable that if the bubble is spherical. This necessary condition of a spherical bubble of the model is observed experimentally in the collapse phase but not in the afterbounce phase of the bubble, explain why the bubble emits of light in the collapse but not in the phase of the afterbounces where she can be smaller, and constitute a validation of the Single Bubble SonoLuminescence of particles model. For the application of the Single Bubble SonoLuminescence of particles model we consider a electron free particle of mass . We note that the interval of time between and energy (who can be considered as the duration when the bubble emits some light) is of the order of picoseconds, the same order that the shortest pulses observed experimentally.

Mahamadou Adama Maiga

2012-12-05T23:59:59.000Z

187

Thermal bubble behaviour in liquid nitrogen under electric fields.  

E-Print Network (OSTI)

??This thesis describes thermally induced bubble behaviour changes in liquid nitrogen (LN2) under electric fields. Cryogenic liquids such as LN2 have been used not only (more)

Wang, Ping

2008-01-01T23:59:59.000Z

188

Visualizing Buoyant Burning Bubbles in Type Ia Supernovae at...  

NLE Websites -- All DOE Office Websites (Extended Search)

simulation was conducted using a specialized low Mach number hydrodynamics code for thermonuclear flames. Adaptive mesh refinement was used to focus resolution on the bubble,...

189

Thermonuclear Supernovae: Is Deflagration Triggered by Floating Bubbles?  

E-Print Network (OSTI)

In recent years, it has become clear from multidimensional simulations that the outcome of deflagrations depends strongly on the initial configuration of the flame. We have studied under which conditions this configuration could consist of a number of scattered, isolated, hot bubbles. Afterwards, we have calculated the evolution of deflagrations starting from different numbers of bubbles. We have found that starting from 30 bubbles a mild explosion is produced M(Ni56)=0.56 solar masses, while starting from 10 bubbles the star becomes only marginally unbound (K = 0.05 foes).

Eduardo Bravo; Domingo Garcia-Senz

2002-11-13T23:59:59.000Z

190

Neutron And Gamma Detector Using An Ionization Chamber With An...  

NLE Websites -- All DOE Office Websites (Extended Search)

Neutron And Gamma Detector Using An Ionization Chamber Neutron And Gamma Detector Using An Ionization Chamber With An Integrated Body And Moderator A detector for detecting...

191

Cloud chamber visualization of primary cosmic rays  

SciTech Connect

From 1948 until 1963, cloud chambers were carried to the top of the atmosphere by balloons. From these flights, which were begun by Edward P. Ney at the University of Minnesota, came the following results: discovery of heavy cosmic ray nuclei, development of scintillation and cherenkov detectors, discovery of cosmic ray electrons, and studies of solar proton events. The history of that era is illustrated here by cloud chamber photographs of primary cosmic rays.

Earl, James A. [Department of Astronomy, University of Maryland, College Park MD (United States)

2013-02-07T23:59:59.000Z

192

Experimental Target Injection and Tracking System  

SciTech Connect

Targets must be injected into an IFE power plant with an accuracy of and plusmn; 5 mm at a rate of approximately 5 to 10 each second. Targets must be tracked very accurately to allow driver beams to be aligned with defined points on the targets with accuracy {+-}200{mu}m for indirect drive and {+-}20{mu}m for direct drive. An experimental target injection and tracking system has been designed and is being constructed at General Atomics to investigate injection and tracking of both direct drive and indirect drive targets. The design is modular to allow testing of alternate target acceleration and tracking methods. The injector system will be used as a tool for testing the survivability of various target designs and provide feed back to the target designers. This 30 m long system will be the centerpiece of a Facility for developing IFE target fabrication and injection technologies. A high-speed high-flow gas valve (designed and built by Oak Ridge National Laboratory) will provide helium propellant gas to the targets. To avoid target damage from excessive acceleration, an 8 m gun barrel is being built to achieve 400 m/s target speed while not exceeding 10,000 m/s{sup 2} acceleration. Direct-drive targets are protected in the barrel by sabots that are spring loaded to separate into two halves after acceleration. A sabot deflector directs the sabot halves away from the target injection path. Gas expansion chambers and orifices, keep propellant gas out of the target-tracking region. Targets will be optically tracked with laser beams and line scan cameras. High-speed computations will calculate target position in less than 2 ms based on the output from the line-scan cameras. Target position and arrival time to a plane in the reaction chamber center will be predicted in real-time based on early target position measurements. The system design, construction progress, and early testing results will be presented.

Petzoldt, R.W. [General Atomics (United States); Alexander, N.B. [General Atomics (United States); Drake, T.J. [General Atomics (United States); Goodin, D.T. [General Atomics (United States); Stemke, R.W. [General Atomics (United States); Jonestrask, K

2003-07-15T23:59:59.000Z

193

Calibration of Muon Reconstruction Algorithms Using an External Muon Tracking System at the Sudbury Neutrino Observatory  

E-Print Network (OSTI)

To help constrain the algorithms used in reconstructing high-energy muon events incident on the Sudbury Neutrino Observatory (SNO), a muon tracking system was installed. The system consisted of four planes of wire chambers, which were triggered by scintillator panels. The system was integrated with SNO's main data acquisition system and took data for a total of 95 live days. Using cosmic-ray events reconstructed in both the wire chambers and in SNO's water Cherenkov detector, the external muon tracking system was able to constrain the uncertainty on the muon direction to better than 0.6 degrees.

SNO Collaboration

2011-05-06T23:59:59.000Z

194

Fluid-bubble interaction and dissipation mechanisms under unsteady breaking waves  

E-Print Network (OSTI)

Fluid-bubble interaction and dissipation mechanisms under unsteady breaking waves of air in bubbles that are believed to suppress liquid phase turbulence to incorporate entrained bubble populations using an Eulerian-Eulerian formulation

Kirby, James T.

195

Modelling the thermal evolution of enzyme-created bubbles in DNA  

Science Journals Connector (OSTI)

...dependence of these oscillating bubbles. To this aim, the underlying...attention is paid to the stability of the oscillating bubbles under the imposed thermal...attention is paid to the stability of the oscillating bubbles under the imposed thermal...

2005-01-01T23:59:59.000Z

196

Stability of a bubble expanding and translating through an inviscid liquid  

Science Journals Connector (OSTI)

A bubble expands adiabatically and translates in an incompressible ... investigate the number of equilibrium points of the bubble and the nature of stability of the bubble at these points. We find that there is o...

Dinesh Khattar; B. B. Chakraborty

2002-05-01T23:59:59.000Z

197

Acoustic energy radiated by nonlinear spherical oscillations of strongly driven bubbles  

Science Journals Connector (OSTI)

...considerations of surface stability. With the quasi-acoustic...acoustic energies of bubbles driven at 23.5kHz...universal boundary of bubble stability at the upper threshold...harmonic modes on bubble levitation, stability and SLJ. Acoust...

2010-01-01T23:59:59.000Z

198

Stability of gas-bubble equilibrium shape in uniform flow of an ideal fluid  

Science Journals Connector (OSTI)

Steady-state motion of a bubble in the shape of an ellipsoid of ... this paper, possible equilibrium shapes of a bubble in the form of a triaxial ellipsoid ... at the stagnation point and within the gas bubble on...

A. G. Petrov

199

Solution of bubble number density with breakage and coalescence in a bubble column by Least-Squares Method  

Science Journals Connector (OSTI)

A steady-state model has been built for an air-water bubble column. The bubble number density constitutive equation has been formulated through integrating the bubble transport equation. Proper kernels for bubble breakage and coalescence rate have been chosen. The momentum balance of the gas phase is included in the model which leads to a set of non-linear differential equations. The model has been successfully solved by using the Least-Squares Method (LSM) with high accuracy and fast convergence. The successive iteration has been applied to the linearised equation set. The model shows excellent agreements with experimental data.

Zhengjie Zhu; Carlos A. Dorao; Hugo A. Jakobsen

2009-01-01T23:59:59.000Z

200

An approximately 4. pi. tracking magnetic spectrometer for RHIC  

SciTech Connect

A tracking magnetic spectrometer based on large Time Projection Chambers (TPC) is proposed to measure the momentum of charged particles emerging from the RHIC beam pipe at angles larger than four degrees and to identify the particle type for those beyond fifteen degrees with momenta up to 700 MeV/c, which is a large fraction of the final charged particles emitted by a low rapidity quark-gluon plasma.

Not Available

1987-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "bubble chamber tracks" 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

Bubbles trapped on the surface of kidney stones as a cause of the twinkling artifact in ultrasound imaging  

Science Journals Connector (OSTI)

A twinkling artifact (TA) associated with urinary calculi has been described as rapidly changing colors on Doppler ultrasound. The purpose of this study was to investigate the mechanism of TA. Doppler processing was performed on raw per channel radio-frequency data collected when imaging human kidney stones in degassed water. Suppression of twinkling by an ensemble of computer generated replicas of a single received signal demonstrated that the TA arises from variability among the acoustic signals and not from electronic signal processing. This variability was found to be random in nature and its suppression by elevated static pressure and its return when the pressure was released suggests that the presence of surface bubbles on the stone is the mechanism that gives rise to the TA. Submicron size bubbles are often trapped in crevices on solid objects but the presence of these bubbles in vivo is unexpected. To further check this mechanism under conditions identical to in vivo stone-producing porcine kidneys were harvested en bloc with a ligated ureter and then placed into a pressure chamber and imaged at elevated atmospheric pressure. The result was similar to in vitro. [Work supported by NIH DK43881 DK092197 RFBR and NSBRI through NASA NCC 9-58.

Wei Lu; Lawrence Crum

2013-01-01T23:59:59.000Z

202

Bubbles trapped on the surface of kidney stones as a cause of the twinkling artifact in ultrasound imaging  

Science Journals Connector (OSTI)

A twinkling artifact (TA) associated with urinary calculi has been described as rapidly changing colors on Doppler ultrasound. The purpose of this study was to investigate the mechanism of the TA. Doppler processing was performed on raw per channel radio-frequency data collected when imaging human kidney stones in degassed water. Suppression of twinkling by an ensemble of computer generated replicas of a single received signal demonstrated that the TA arises from variability among the acoustic signals and not from electronic signal processing. This variability was found to be random in nature and its suppression by elevated static pressure and its return when the pressure was released suggests that the presence of surface bubbles on the stone is the mechanism of the TA. Submicron size bubbles are often trapped in crevices on solid objects but the presence of these bubbles in vivo is unexpected. To further check this mechanism under conditions identical to in vivo stone-producing porcine kidneys were harvested en bloc with a ligated ureter and then placed into a pressure chamber and imaged at elevated atmospheric pressure. The result was similar to in vitro. Work supported by NIH DK43881 DK092197 RFBR 11-02-01189 12-02-00114 and NSBRI through NASA NCC 9-58.

Oleg Sapozhnikov; Wei Lu; Michael R. Bailey; Peter Kaczkowski; Lawrence A. Crum

2013-01-01T23:59:59.000Z

203

Final report for NIF chamber dynamics studies  

SciTech Connect

The National Ignition Facility (NIF), a 1.8 MJ, 192 laser beam facility, will have anticipated fusion yields of up to 20 MJ from D-T pellets encased in a gold hohlraum target. The energy emitted from the target in the form of x rays, neutrons, target debris kinetic energy, and target shrapnel will be contained in a 5 m. radius spherical target chamber. various diagnostics will be stationed around the target at varying distances from the target. During each shot, the target will emit x rays that will vaporize nearby target facing surfaces including those of the diagnostics, the target positioner, and other chamber structures. This ablated vapor will be transported throughout the chamber, and will eventually condense and deposit on surfaces in the chamber, including the final optics debris shields. The research at the University of California at Berkeley relates primarily to the NIF chamber dynamics. The key design issues are the ablation of the chamber structures, transport of the vapor through the chamber and the condensation or deposition processes of those vaporized materials. An understanding of these processes is essential in developing a concept for protecting the fina optics debris shields from an excessive coating (> 10 A) of target debris and ablated material, thereby prolonging their lifetime between change-outs. At Berkeley, we have studied the physical issues of the ablation process and the effects of varying materials, the condensation process of the vaporized material, and design schemes that can lower the threat posed to the debris shields by these processes. The work or portions of the work completed this year have been published in several papers and a dissertation [l-5].

Burnham, A; Peterson, P F; Scott, J M

1998-09-01T23:59:59.000Z

204

acoustic cavitation of slightly subcritical bubbles of Mathematics, Boston University, Boston, Massachusetts 02215  

E-Print Network (OSTI)

On acoustic cavitation of slightly subcritical bubbles Anthony ¡ Harkin Department in liquids when surface tension is the dominant effect, such as submicron air bubbles in water, where

Harkin, Anthony

205

E-Print Network 3.0 - acoustic cavitation bubble Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

Collection: Physics 62 Acoustic saturation in bubbly cavitating flow adjacent to an oscillating wall T. Colonius,a) Summary: Acoustic saturation in bubbly cavitating flow...

206

E-Print Network 3.0 - ads vacuum bubbles Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

Department of Applied Physics, TU... October 2000 A new type of apparatus for the production of single bubbles of adjustable size is presented... . A single bubble is generated...

207

On the capillary vibration and stability of a charged bubble in a dielectric liquid  

Science Journals Connector (OSTI)

The capillary vibration and stability of a charged bubble against infinitesimal volume and shape perturbations when the bubble is immersed in a viscous incompressible dielectric ... noncentrosymmetric radial and ...

A. N. Zharov; A. I. Grigorev

2001-11-01T23:59:59.000Z

208

Bubble path in the wake of a cavitating propeller  

Science Journals Connector (OSTI)

Propellers that operate underwater at high rpm's cavitate at the tip. The tip cavitation creates air bubbles that are then swept downstream by the motion of the surrounding fluid. In this paper a theory is presented to predict the local velocity and the path of the bubble. The bubble motion is assumed to be governed by a group of terms due to the acceleration of the displaced fluid the convective term and the drag due to the cross?sectional area of the bubble. At very low and very high Reynolds numbers the equations have been solved in closed form. Results are presented for the bubble velocity and path for the following flow fields: (a) uniform axial flow field and (b) uniform flow field with an axially decaying swirling component. In all cases presented the bubble axial velocity component asymptotes to the free stream velocity; the manner in which it asymptotes is exponential at very low Reynolds numbers and algebraic at high Reynolds numbers. Bubble helical paths and velocity patterns are shown for different bubble sizes.

Mauro Picrucci

1988-01-01T23:59:59.000Z

209

CP-Violating Bubble Wall and Electroweak Baryogenesis  

Science Journals Connector (OSTI)

...August 1997 research-article Articles CP-Violating Bubble Wall and Electroweak...baryogenesis depends on the profile of the CP-violating bubble wall created at the first...point out that a sufficiently small explicit CP violation gives nonperturbative effects......

Koichi Funakubo; Akira Kakuto; Shoichiro Otsuki; Fumihiko Toyoda

1997-08-01T23:59:59.000Z

210

CP-Violating Profile of the Electroweak Bubble Wall  

Science Journals Connector (OSTI)

......November 1995 research-article Articles CP-Violating Profile of the Electroweak Bubble...electroweak baryogenesis, the profile of the CP violating bubble wall, created at the first-order...solutions. Two of them smoothly connect the CP-violating broken phase and the symmetric......

Koichi Funakubo; Akira Kakuto; Shoichiro Otsuki; Kazunori Takenaga; Fumihiko Toyoda

1995-11-01T23:59:59.000Z

211

MICRO-BUBBLE SPARGING OF ANCHORAGE DEPENDENT ANIMAL CELL CULTURES  

Science Journals Connector (OSTI)

ABSTRACT We have recently demonstrated that micro-bubble sparging can be successfully applied for bubble oxygenation of suspended animal cell cultures. The success of micro-bubble sparging requires the use of surfactants (such as Pluronic F-68 and silicone based antifoams) which minimize foaming and bubble damaging effects and, at the same time improve the oxygen transfer capabilities across bubbles. For anchored animal cells the use of surfactants and micro-bubble sparging requires a careful evaluation of the choice of substrates which will enable maximum cell adhesion and growth in the presence of the appropriate surfactant. Results will be presented which show that cell culture polystyrene is an excellent substrate for the growth of anchored cells in surfactant-based media formulations. These fundamental studies were extrapolated to large-scale perfusion cultures of anchored BHK cells, cultivated in a polystyrene CellCube (Costar, U.K.), using micro-bubble sparging for medium oxygenation in a 2L stirred tank bioreactor (LH Fermentation Ltd). High yields of anchored cells (in excess of 1010 cells) with viabilities greater than 95% were obtained within 710 days post-inoculation. Keywords Micro-bubble oxygenation; anchored cells; Pluronic; adhesion; perfusion; foaming.

A. Handa-Corrigan; S. Nikolay; R. Brydges

1994-01-01T23:59:59.000Z

212

E-Print Network 3.0 - atlas muon chambers Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

chambers Search Powered by Explorit Topic List Advanced Search Sample search results for: atlas muon chambers...

213

E-Print Network 3.0 - atlas muon chamber Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

chamber Search Powered by Explorit Topic List Advanced Search Sample search results for: atlas muon chamber...

214

Fragmentation Barriers of Toroidal and Bubble Nuclei  

E-Print Network (OSTI)

those estimated recently from liquid-drop models [24,25]. We simulate the dynamics of nucleus-nucleus collisions with the Boltzmann-Uehling-Uhlenbeck equation [27] Bt " (27r)s dB+ v V?f~ ?V?U V'zfq ? d k2dO ""v12[fsf4(l ?f1)(1?f2) ?f~f2(1 ?fs)(1 ?f4.../49(4)/1778(5)/$06. 00 R1778 1994 The American Physical Society 49 FRAGMENTATION BARRIERS OF TOROIDAL AND BUBBLE NUCLEI R1779 TOP VIEW FRONT VIEW and 2 for 2Mo+ 2Mo collisions at E/A =75 MeV and b=0, for both the stifF (Fig. 1) and the soft (Fig. 2) equa- tions...

Xu, HM; Gagliardi, Carl A.; Tribble, Robert E.; Wong, C. Y.

1994-01-01T23:59:59.000Z

215

The temperatures of single?bubble sonoluminescence  

Science Journals Connector (OSTI)

We observe extraordinarily intense single?bubble sonoluminescence (SBSL) from concentrated sulfuric acid (H2SO4) containing noble gases. Strong atomic Ar emission and extensive vibronic progressions from sulfur monoxide (SO) are also present in the SBSL spectra. The Ar atom excited states observed are too high in energy to be thermally populated and must be excited by high energy particle impact consistent with Ar atom SBSL from an emissive shell surrounding an optically opaque plasma core just as in a star or thermonuclear explosion. From relative intensities of Ar lines we find that the observed effective emission temperature during SBSL is 152001900?K. SBSL emission temperatures can be systematically controlled over the range from ?1500 to ?20000?K by changing the applied acoustic pressure or the thermal conductivity of the dissolved gas.

2004-01-01T23:59:59.000Z

216

Acoustic scattering by bubbles in naturally occurring mud sediments  

Science Journals Connector (OSTI)

Naturally occurring sediment mud contains bubbles created by decaying vegetable matter. Work reported by Preston Wilson etal. (ca. 2007) has determined via x-ray tomography systems that mud bubbles are not spherical in shape but resemble oblate spheroids and are inhomogeneously distributed. These features are explained in terms of the card-house structure of mud with an adaptation of the fracture mechanics ideas of Boudreau etal. (ca. 2002). The scattering of sound at low frequencies by such nonspherical bubbles has both monopole and dipole components. The scatteredwave associated with the monopole term is proportional to the bubble volume. The dipole term involves an effective entrained mass tensor which is found by a solution of Laplace's equation. All bubbles regardless of shape have a smallest resonance frequency and the scattered radiation near the resonance frequency is monopole in character. Example solutions for the resonance frequencies and the scattering near resonance are given for oblate spheroidal bubbles and a suggested interpolation from low frequencies to resonance frequencies is given. A discussion is also given of how one can make use of the range-evolving form of compact-source generated pulses to infer information about the bubbles near the propagation path.

Allan D. Pierce; Willam M. Carey

2011-01-01T23:59:59.000Z

217

Inertial confinement fusion based on the ion-bubble trigger  

SciTech Connect

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

218

A Cosmic Ray Measurement Facility for ATLAS Muon Chambers  

E-Print Network (OSTI)

Monitored Drift Tube (MDT) chambers will constitute the large majority of precision detectors in the Muon Spectrometer of the ATLAS experiment at the Large Hadron Collider at CERN. For commissioning and calibration of MDT chambers, a Cosmic Ray Measurement Facility is in operation at Munich University. The objectives of this facility are to test the chambers and on-chamber electronics, to map the positions of the anode wires within the chambers with the precision needed for standalone muon momentum measurement in ATLAS, and to gain experience in the operation of the chambers and on-line calibration procedures. Until the start of muon chamber installation in ATLAS, 88 chambers built at the Max Planck Institute for Physics in Munich have to be commissioned and calibrated. With a data taking period of one day individual wire positions can be measured with an accuracy of 8.3 micrometers in the chamber plane and 27 micrometers in the direction perpendicular to that plane.

O. Biebel; M. Binder; M. Boutemeur; A. Brandt; J. Dubbert; G. Duckeck; J. Elmsheuser; F. Fiedler; R. Hertenberger; O. Kortner; T. Nunnemann; F. Rauscher; D. Schaile; P. Schieferdecker; A. Staude; W. Stiller; R. Stroehmer; R. Vertesi

2003-07-30T23:59:59.000Z

219

Numerical Simulation of 3D Bubbles Rising in Viscous Liquids using a Front Tracking Method  

E-Print Network (OSTI)

Hua a , Jan F. Stene b and Ping Lin b a Institute of High Performance Computing, 1 Science Park Road of High Performance Computing 1 Science Park Road, #01-01 The Capricorn Singapore 117528 Email address. Stene b and Ping Lin b a Institute of High Performance Computing, 1 Science Park Road, #01

Lin, Ping

220

Bubbly Flow Experiment in Channel Using an Optical Probe and Tracking Algorithm  

E-Print Network (OSTI)

communication between the computer and optoelectronic unit. The probe takes advantage of the physics between two mediums, air and water (Fig. 8). The optical fiber, manufactured from glass, relays the signal in the probe. Internal reflection allows...

Khan, Abdul

2012-10-19T23:59:59.000Z

Note: This page contains sample records for the topic "bubble chamber tracks" 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

Study of the calibration of X-T relation for the BESIII drift chamber  

E-Print Network (OSTI)

This paper introduces the calibration of the time-to-distance relation for the BESIII drift chamber. The parameterization of the time-to-distance relation is presented. The studies of left-right asymmetry and the variation with the entrance angle are performed. The impact of dead channels on the time-to-distance relation is given special attention in order to reduce the shifts of the measured momenta for the tracks passing near dead cells. Finally we present the spatial resolution (123 {\\mu}m) for barrel Bhabha events (|cos{\\theta}|data taken in 2012.

Xiao-Lin Kang; Ling-Hui Wu; Zhi Wu; Tao Luo; Chen Hu; Hai-Xai Wang; Shuang-Shi Fang; Kang-Lin He; Wei-Dong Li; Wei-Guo Li; Ze-Pu Mao; Liang-Liang Wang; Ye Yuan; Yao Zhang

2014-05-14T23:59:59.000Z

222

MicroBooNE: A New Liquid Argon Time Projection Chamber Experiment  

SciTech Connect

Liquid Argon Time Projection Chamber detectors are well suited to study neutrino interactions, and are an intriguing option for future massive detectors capable of measuring the parameters that characterize neutrino oscillations. These detectors combine fine-grained tracking with calorimetry, allowing for excellent imaging and particle identification ability. In this talk the details of the MicroBooNE experiment, a 175 ton LArTPC which will be exposed to Fermilab's Booster Neutrino Beamline starting in 2011, will be presented. The ability of MicroBooNE to differentiate electrons from photons gives the experiment unique capabilities in low energy neutrino interaction measurements.

Soderberg, M.

2009-10-01T23:59:59.000Z

223

Role of Air Bubbles Overlooked in the Adsorption of Perfluorooctanesulfonate on Hydrophobic Carbonaceous Adsorbents  

Science Journals Connector (OSTI)

Role of Air Bubbles Overlooked in the Adsorption of Perfluorooctanesulfonate on Hydrophobic Carbonaceous Adsorbents ... School

Pingping Meng; Shubo Deng; Xinyu Lu; Ziwen Du; Bin Wang; Jun Huang; Yujue Wang; Gang Yu; Baoshan Xing

2014-11-03T23:59:59.000Z

224

The singularity at the tip of the rising plane bubble: The case of nonzero surface tension  

E-Print Network (OSTI)

The singularity at the tip of the rising plane bubble: The case of nonzero surface tension Prabir pointed bubble in the presenceof surface tension. These bubbles have been recently obtained by Vanden to find the apexangle as a function of the speedof the bubbles for a fixed value of surface tension

Daripa, Prabir

225

Bubble Prints Main Concept: Tension...but it's mostly just fun  

E-Print Network (OSTI)

Bubble Prints Main Concept: Tension...but it's mostly just fun Materials Glasses/Jars .25 cup glasses or bowls to have a selection of bubble print colors. 3. Cover the top of the jars or glasses and shake until the bubble mix and paint are well mixed together. 4. Dump out about 1/2 inch of the bubble

Benitez-Nelson, Claudia

226

Anomalous bubble propagation in elastic tubes Alexandra Heap and Anne Juela  

E-Print Network (OSTI)

Anomalous bubble propagation in elastic tubes Alexandra Heap and Anne Juela Manchester Centre of bubble with a characteristic rounded tip, our experiments reveal a surprising selection of novel bubbles with counterintuitive shapes that reopen strongly collapsed, liquid-filled elastic tubes. Our multiple bubbles

227

Single Bubble SonoLuminescence of Particles model M. ADAMA MAIGA  

E-Print Network (OSTI)

Single Bubble SonoLuminescence of Particles model M. ADAMA MAIGA LML laboratory (Laboratoire de Bubble SonoLuminescence is a phenomenon where the vapor bubble trapped in a liquid collapse by emitting of a light. It is very known that the temperature inside the bubble depends on the radius, during

Paris-Sud XI, Université de

228

10.1098/rspa.2002.1063 Acoustic resonances in the bubble plume  

E-Print Network (OSTI)

10.1098/rspa.2002.1063 Acoustic resonances in the bubble plume formed by a plunging water jet to investigate the near-field sound from an axisym- metric conical bubble plume formed by a continuous vertical to coherent collective oscillations of the bubbles within the plume, that is to say, the biphasic bubbly

Buckingham, Michael

229

Response of a bubble bearing viscoelastic fluid to rapid decompression: Implications for explosive volcanic eruptions  

E-Print Network (OSTI)

Response of a bubble bearing viscoelastic fluid to rapid decompression: Implications for explosive Abstract We conducted rapid decompression experiments using bubble-bearing viscoelastic fluid in a vertical of the bubbles, DP=Pg ?Po, to understand the behavior of bubbly-magmas under rapid decompression. We find

Manga, Michael

230

modeling in physiology Stabilized bubbles in the body: pressure-radius  

E-Print Network (OSTI)

modeling in physiology Stabilized bubbles in the body: pressure-radius relationships and the limits bubbles in the body: pressure-radius relationships and the limits to stabilization. J. Appl. Physiol. 82 for comparison of bubbles stabilized by different mechanisms. Gases diffuse in or out of stabilized bubbles

Raychaudhuri, Soumya

231

Dynamics of Subcritical Bubbles in First Order Phase Transition  

E-Print Network (OSTI)

We derivate the Langevin and the Fokker-Planck equations for the radius of $O(3)$-symmetric subcritical bubbles as a phenomenological model to treat thermal fluctuation. The effect of thermal noise on subcritical bubbles is examined. We find that the fluctuation-dissipation relation holds and that in the high temperature phase the system settles down rapidly to the thermal equilibrium state even if it was in a nonequilibrium state initially. We then estimate the typical size of subcritical bubbles as well as the amplitude of fluctuations on that scale. We also discuss their implication to the electroweak phase transition.

Tetsuya Shiromizu; Masahiro Morikawa; Jun'ichi Yokoyama

1995-09-05T23:59:59.000Z

232

SUBCRITICAL BUBBLES NEAR THE PHASE SPACE DOMAIN WALL  

E-Print Network (OSTI)

We study the subcritical bubble formation near the phase space domain wall. We take into account that the phase of the scalar field can vary using complex U(1) symmetric field and a phenomenological potential with cubic term responsible to symmetry breaking. We show that the presence of the domain wall induces subcritical bubbles so that their formation rate near the wall is considerably larger than far of it. The allowed deviations of the phases of new bubbles are so large that they prevent the system from induced nucleation.

J. Sirkka; I. Vilja

1995-03-31T23:59:59.000Z

233

Behavioural aspects of price bubbles - case of real estate  

Science Journals Connector (OSTI)

Price bubbles are created by investors and customers. An analysis of price bubbles requires especially critical identification and assessment of the impact of various factors on this phenomenon. The analyses of crises primarily examine economic reasons and macroeconomic feedback and interaction, however, they devote little space to the role of customers (investors) as subjects of a crisis, a role which can be and usually is active. The purpose of this paper is to show that the role of behavioural factors in the creation of a price bubble is important and are able to analyse their force of impact.

Piotr Masiukiewicz; Pawel Dec

2014-01-01T23:59:59.000Z

234

Analysis of bubble cavitation in ultrasound therapy by wavelet technique  

Science Journals Connector (OSTI)

Bubble cavitation is one of the major mechanisms for ultrasound treatment. To understand its characteristics, cavitation signals were picked up using passive cavitation detection and then analysed by wavelet transform. Although the Fast Fourier Transform (FFT) has been used widely in signal analysis, the absence of temporal information is one of its limitations. The inertial cavitation strength detected by wavelet method was ?60 folds higher than that using FFT. Furthermore, the relationship of waveform profile and acoustic pressure with the corresponding bubble cavitation were investigated. All together, wavelet approach could be new tool for studying bubble cavitation.

Yufeng Zhou

2008-01-01T23:59:59.000Z

235

Are We in a Medical Education Bubble Market?  

Science Journals Connector (OSTI)

...of that value. Recent examples include the U.S. housing bubble, in which home prices rapidly rose until 2007 and then just as rapidly fell, and the dot-com bubble, in which prices of Internet stocks rose until 2000 and then plummeted. Bubbles burst when some new sense of lower intrinsic value appears... Debt-to-income ratios for new physicians reveal the connection between what physicians can charge patients and what medical schools can charge students. If we aim to reduce the costs of health care, we need to reduce the costs of medical education.

Asch D.A.Nicholson S.Vujicic M.

2013-11-21T23:59:59.000Z

236

MATERIAL TRACKING USING LANMAS  

SciTech Connect

LANMAS is a transaction-based nuclear material accountability software product developed to replace outdated and legacy accountability systems throughout the DOE. The core underlying purpose of LANMAS is to track nuclear materials inventory and report transactions (movement, mixing, splitting, decay, etc.) to the Nuclear Materials Management and Safeguards System (NMMSS). While LANMAS performs those functions well, there are many additional functions provided by the software product. As a material is received onto a site or created at a site, its entire lifecycle can be tracked in LANMAS complete to its termination of safeguards. There are separate functions to track material movements between and within material balance areas (MBAs). The level of detail for movements within a MBA is configurable by each site and can be as high as a site designation or as detailed as building/room/rack/row/position. Functionality exists to track the processing of materials, either as individual items or by modeling a bulk process as an individual item to track inputs and outputs from the process. In cases where sites have specialized needs, the system is designed to be flexible so that site specific functionality can be integrated into the product. This paper will demonstrate how the software can be used to input material into an account and track it to its termination of safeguards.

Armstrong, F.

2010-06-07T23:59:59.000Z

237

Small Gas Bubble Experiment for Mitigation of Cavitation Damage and Pressure Waves in Short-pulse Mercury Spallation Targets  

SciTech Connect

Populations of small helium gas bubbles were introduced into a flowing mercury experiment test loop to evaluate mitigation of beam-pulse induced cavitation damage and pressure waves. The test loop was developed and thoroughly tested at the Spallation Neutron Source (SNS) prior to irradiations at the Los Alamos Neutron Science Center - Weapons Neutron Research Center (LANSCE-WNR) facility. Twelve candidate bubblers were evaluated over a range of mercury flow and gas injection rates by use of a novel optical measurement technique that accurately assessed the generated bubble size distributions. Final selection for irradiation testing included two variations of a swirl bubbler provided by Japan Proton Accelerator Research Complex (J-PARC) collaborators and one orifice bubbler developed at SNS. Bubble populations of interest consisted of sizes up to 150 m in radius with achieved gas void fractions in the 10^-5 to 10^-4 range. The nominal WNR beam pulse used for the experiment created energy deposition in the mercury comparable to SNS pulses operating at 2.5 MW. Nineteen test conditions were completed each with 100 pulses, including variations on mercury flow, gas injection and protons per pulse. The principal measure of cavitation damage mitigation was surface damage assessment on test specimens that were manually replaced for each test condition. Damage assessment was done after radiation decay and decontamination by optical and laser profiling microscopy with damaged area fraction and maximum pit depth being the more valued results. Damage was reduced by flow alone; the best mitigation from bubble injection was between half and a quarter that of flow alone. Other data collected included surface motion tracking by three laser Doppler vibrometers (LDV), loop wall dynamic strain, beam diagnostics for charge and beam profile assessment, embedded hydrophones and pressure sensors, and sound measurement by a suite of conventional and contact microphones.

Wendel, Mark W [ORNL] [ORNL; Felde, David K [ORNL] [ORNL; Sangrey, Robert L [ORNL] [ORNL; Abdou, Ashraf A [ORNL] [ORNL; West, David L [ORNL] [ORNL; Shea, Thomas J [ORNL] [ORNL; Hasegawa, Shoichi [Japan Atomic Energy Agency (JAEA)] [Japan Atomic Energy Agency (JAEA); Kogawa, Hiroyuki [Japan Atomic Energy Agency (JAEA)] [Japan Atomic Energy Agency (JAEA); Naoe, Dr. Takashi [Japan Atomic Energy Agency (JAEA)] [Japan Atomic Energy Agency (JAEA); Farny, Dr. Caleb H. [Boston University] [Boston University; Kaminsky, Andrew L [ORNL] [ORNL

2014-01-01T23:59:59.000Z

238

Bubble tube: Apparatus for determining rate of collection of bacteria ...  

Science Journals Connector (OSTI)

Jul 9, 1973 ... the vertical, we lift it out of the water. The ... must rise through sterile water nearly four times as far .... wish to point out that by use of the bubble.

1999-12-31T23:59:59.000Z

239

The transition from two phase bubble flow to slug flow  

E-Print Network (OSTI)

The process of transition from bubble to slug flow in a vertical pipe has been studied analytically and experimentally. An equation is presented which gives the agglomeration time as a function of void fraction, channel ...

Radovcich, Nick A.

1962-01-01T23:59:59.000Z

240

Bubble Production Mechanism in a Microfluidic Foam Generator  

Science Journals Connector (OSTI)

We present the design and characterization of a microfluidic bubble generator that has the potential of producing monodisperse bubbles in 256 production channels that can operate in parallel. For a single production channel we demonstrate a production rate of up to 4kHz with a coefficient of variation of less than 1%. We observe a two-stage bubble production mechanism: initially the gas spreads onto a shallow terrace, and then overflows into a larger foam collection channel; pinning of the liquid-gas meniscus is observed at the terrace edge, the result being an asymmetric pinch-off. A semiempirical physical model predicts the scaling of bubble size with fluid viscosity and gas pressure from measurements of the pinned meniscus width.

M. Stoffel; S. Wahl; E. Lorenceau; R. Hhler; B. Mercier; D. E. Angelescu

2012-05-07T23:59:59.000Z

Note: This page contains sample records for the topic "bubble chamber tracks" 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

The Measurement of Bubble-Size Distributions by Acoustical Backscatter  

Science Journals Connector (OSTI)

A multifrequency acoustical-backscatter technique is described for determining the size distribution of bubbles with radii between 8 and 130 m. The method makes use of the resonance in the microbubbles and operates at six frequencies ranging ...

Svein Vagle; David M. Farmer

1992-10-01T23:59:59.000Z

242

non living organic particle formation from bubble dissolution  

Science Journals Connector (OSTI)

Jul 8, 1975 ... 446. iVOteS. Table 1. Particulate organic carbon retained by 0.8-p Flotronics silver filters before and after many small bubbles were dissolved in...

2000-01-04T23:59:59.000Z

243

Patterns of Bubble Clouds organized by Langmuir Circulation  

Science Journals Connector (OSTI)

A commonly observed property of near-surface bubble distributions is their collective organization into long rows aligned with the wind under the influence of Langmuir circulation. Time series observations with sonars having fixed orientation ...

David Farmer; Ming Li

1995-06-01T23:59:59.000Z

244

Low-Frequency Resonant Scattering of Bubble Clouds  

Science Journals Connector (OSTI)

The acoustic properties of water can be drastically modified by a small amount of air content in the fluid. The dynamics of bubble clouds and their collected oscillation mechanisms are among topics of active research in underwater acoustics. In ...

Paul A. Hwang; William J. Teague

2000-06-01T23:59:59.000Z

245

Modelling of bubble behaviour in aluminium reduction cells  

Science Journals Connector (OSTI)

A phenomenological model for the creation and transport of anodic gas bubbles in aluminium reduction cells is presented. The proposed model is a multiscale approach in which molecular species are produced and transported through a supersaturated electrolyte. Sub-grid bubbles are allowed to form through nucleation and the resulting bubble population evolves through mass transfer and coalescence. As sub-grid bubbles reach a certain size, they are transferred to a macroscopic phase, which evolution is governed by a volume of fluid method. The current work describes the underlying theory and motivation for the proposed model and it is used to describe a laboratory-scale electrolysis cell, showing the potential of the suggested approach. The influence of selected properties of the model is identified by means of a factorial analysis.

Kristian Etienne Einarsrud; Stein Tore Johansen

2012-01-01T23:59:59.000Z

246

Bubble Stabilization of Spectral Methods: The Multidimensional Case  

Science Journals Connector (OSTI)

A spectral Legendre method for the advection-diffusion equation is stabilized with the addition of locally supported bubble functions. It is shown that the spectral ... accuracy of the scheme is preserved and its...

Gabriella Puppo

1998-06-01T23:59:59.000Z

247

Bubble stabilized discontinuous Galerkin method for parabolic and elliptic problems  

Science Journals Connector (OSTI)

In this paper we give an analysis of a bubble stabilized discontinuous Galerkin method for elliptic and parabolic problems. The method consists of stabilizing the numerical scheme by enriching the discontinuou...

Erik Burman; Benjamin Stamm

2010-08-01T23:59:59.000Z

248

Quantum Decoherence of Subcritical Bubble in Electroweak Phase Transition  

E-Print Network (OSTI)

In a weakly first order phase transition the typical scale of a subcritical bubble calculated in our previous papers turned out to be too small. At this scale quantum fluctuations may dominate and our previous classical result may be altered. So we examine the critical size of a subcritical bubble where quantum-to-classical transition occurs through quantum decoherence. We show that this critical size is almost equal to the typical scale which we previously obtained.

Tetsuya Shiromizu

1995-12-14T23:59:59.000Z

249

Behaviour of bubble clusters in a turbulent flotation cell  

Science Journals Connector (OSTI)

Abstract The rate of capture of particles decreases as the particle size increases in froth flotation. It has been postulated that the upper size range of particles that can be recovered in conventional machines could be extended by the use of bubble clusters [1]. This study is concerned with the behaviour of bubble clusters in turbulent flotation cell. The breakup and re-formation of clusters and the effect of bubble size and impeller speed on the behaviour of clusters have been investigated. The apparatus used was essentially a laboratory flotation cell, agitated by a Rushton turbine. The cell was modified to allow pre-formed clusters to rise out of a fluidized bed and into the path of the rotating impeller. The events were captured using a digital camera, and the images were analysed to give the sizes of the bubbles and clusters. In the first part of the investigation, a collector was used but no frother. Under these conditions, the bubble diameter was effectively controlled by the collector concentration, and it varied considerably. It was found that the sizes of clusters decrease with increasing shear rate at low impeller speeds, and at higher speeds the clusters are broken up into bubbles and particles. In the second part, frother was used at a concentration above the critical coalescence concentration, to control the bubble size, which remained essentially constant at this concentration. The bubbles were too small to be broken by the action of the impeller, so they always remained at the same size. In this case it was found that when the impeller speed was increased, two stages of formation were observed, the fragmentation and equilibrium stages. In the fragmentation stage, at low impeller speeds, the clusters were loose and filamentous, and as the energy input increases, they rupture and re-form. In the second stage, above a critical impeller speed, dense clusters formed whose size was relatively insensitive to the energy input.

Zhihao Chen; Seher Ata; Graeme J. Jameson

2015-01-01T23:59:59.000Z

250

On-Site Wastewater Treatment Systems: Leaching Chambers  

E-Print Network (OSTI)

Leaching chambers distribute treated wastewater into the soil. This publication lists the advantages and disadvantages of leaching chamber systems, explains how to maintain them and gives estimates of costs....

Lesikar, Bruce J.

2000-02-04T23:59:59.000Z

251

Analysis of Rayleigh-Plesset dynamics for sonoluminescing bubbles  

E-Print Network (OSTI)

Recent work on single bubble sonoluminescence (SBSL) has shown that many features of this phenomenon, especially the dependence of SBSL intensity and stability on experimental parameters, can be explained within a hydrodynamic approach. More specifically, many important properties can already be derived from an analysis of bubble wall dynamics. This dynamics is conveniently described by the Rayleigh-Plesset (RP) equation. In this work we derive analytical approximations for RP dynamics and subsequent analytical laws for parameter dependences. These results include (i) an expression for the onset threshold of SL, (ii) an analytical explanation of the transition from diffusively unstable to stable equilibria for the bubble ambient radius (unstable and stable sonoluminescence), and (iii) a detailed understanding of the resonance structure of the RP equation. It is found that the threshold for SL emission is shifted to larger bubble radii and larger driving pressures if surface tension is enlarged, whereas even a considerable change in liquid viscosity leaves this threshold virtually unaltered. As an enhanced viscosity stabilizes the bubbles against surface oscillations, we conclude that the ideal liquid for violently collapsing, surface stable SL bubbles should have small surface tension and large viscosity, although too large viscosity (>40 times the viscosity of water) will again preclude collapses.

Sascha Hilgenfeldt; Michael P. Brenner; Siegfried Grossmann; Detlef Lohse

1998-05-18T23:59:59.000Z

252

Reduce Steam Trap Failures at Chambers Works  

E-Print Network (OSTI)

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

Kouba, C.

253

Bubble Dynamics, Shock Waves and Sonoluminescence Author(s): Claus-Dieter Ohl, Thomas Kurz, Reinhard Geisler, Olgert Lindau, Werner  

E-Print Network (OSTI)

Bubble Dynamics, Shock Waves and Sonoluminescence Author(s): Claus-Dieter Ohl, Thomas Kurz, Physical and Engineering Sciences. http://www.jstor.org #12;THE ROYAL SOCIETY Bubble dynamics, shock waves emission by bubbles is studied experimentally. Single bubbles kept in a bubble trap and single laser

Ohl, Claus-Dieter

254

Color-based tracking of plasma dust particles  

SciTech Connect

Color-based tracking to observe agglomeration of deposited particles inside a compact planar magnetron during plasma discharge was done by creating high dynamic range (HDR) images of photos captured by a Pentax K10D digital camera. Carbon erosion and redeposition was also monitored using the technique. The HDR images were subjected to a chromaticity-based constraint discoloration inside the plasma chamber indicating film formation or carbon redeposition. Results show that dust deposition occurs first near the evacuation pumps due to the pressure gradient and then accumulates at the positively charged walls of the chamber. This method can be applied to monitor dust formation during dusty plasma experiments without major modification of plasma devices, useful especially for large fusion reactors.

Villamayor, Michelle Marie S., E-mail: mvillamayor@nip.upd.edu.ph; Soriano, Maricor N.; Ramos, Henry J. [National Institute of Physics, University of the Philippines, Diliman, Quezon City 1101 (Philippines)] [National Institute of Physics, University of the Philippines, Diliman, Quezon City 1101 (Philippines); Kato, Shuichi; Wada, Motoi [Graduate School of Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321 (Japan)] [Graduate School of Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321 (Japan)

2014-02-15T23:59:59.000Z

255

Tracks in the Snow  

NLE Websites -- All DOE Office Websites (Extended Search)

Tracks in the Snow Tracks in the Snow Nature Bulletin No. 98 January 11, 1947 Forest Preserve District of Cook County William N. Erickson, President Roberts Mann, Superintendent of Conservation TRACKS IN THE SNOW Tracks in the snow tell fascinating stories of the secret lives of the wild animals that are abroad in wintertime -- stories of their search for food and the never-ending warfare between the hunter and the hunted. Walking through the woods, we came upon the trail of a red fox. The footprints of a fox are more pointed than those of a dog, more nearly in a straight line, and the hind foot is placed exactly on the print of the corresponding front foot. More-over, this fox had walked out across a meadow to a big ant hill on top of which he sat to listen and test the wind for scent. A dog will not do that. Later, back in the woods, he had jumped on a fallen tree and trotted along its length. A dog will not do that, either. The fox was traveling leisurely, pausing here and there to sniff at tufts of grass and other possible hiding places for mice.

256

Solar Tracking by Plants  

Science Journals Connector (OSTI)

...University of Utah, Salt Lake City 84112...Solar Tracking in Desert Plants In the arid...were coastal sage scrub, which grows during...Mohave and Colorado desert scrub, which grow in...Mohave and Colorado desert scrub communities at sites...

James Ehleringer; Irwin Forseth

1980-12-05T23:59:59.000Z

257

CALCULATION OF PULSED KICKER MAGNETIC FIELD ATTENUATION INSIDE BEAM CHAMBERS  

NLE Websites -- All DOE Office Websites (Extended Search)

CALCULATION OF PULSED KICKER MAGNETIC FIELD ATTENUATION CALCULATION OF PULSED KICKER MAGNETIC FIELD ATTENUATION INSIDE BEAM CHAMBERS S. H. Kim January 8, 2001 1. Introduction and Summary The ceramic beam chambers in the sections of the kicker magnets for the beam injection and extraction in the Advanced Photon Source (APS) are made of alumina. The inner surface of the ceramic chamber is coated with a conductive paste. The choice of coating thickness is intended to reduce the shielding of the pulsed kicker magnetic field while containing the electromagnetic fields due to the beam bunches inside the chamber, and minimize the Ohmic heating due to the fields on the chamber [1]. The thin coating generally does not give a uniform surface resistivity for typical dimensions of the ceramic chambers in use. The chamber cross section is a circular or

258

Vacuum chamber with a supersonic-flow aerodynamic window  

DOE Patents (OSTI)

A supersonic flow aerodynamic window is disclosed whereby a steam ejector situated in a primary chamber at vacuum exhausts superheated steam toward an orifice to a region of higher pressure, creating a barrier to the gas in the region of higher pressure which attempts to enter through the orifice. In a mixing chamber outside and in fluid communication with the primary chamber, superheated steam and gas are combined into a mixture which then enters the primary chamber through the orifice. At the point of impact of the ejector/superheated steam and the incoming gas/superheated steam mixture, a barrier is created to the gas attempting to enter the ejector chamber. This barrier, coupled with suitable vacuum pumping means and cooling means, serves to keep the steam ejector and primary chamber at a negative pressure, even though the primary chamber has an orifice to a region of higher pressure.

Hanson, C.L.

1980-10-14T23:59:59.000Z

259

Vacuum chamber with a supersonic flow aerodynamic window  

DOE Patents (OSTI)

A supersonic flow aerodynamic window, whereby a steam ejector situated in a primary chamber at vacuum exhausts superheated steam toward an orifice to a region of higher pressure, creating a barrier to the gas in the region of higher pressure which attempts to enter through the orifice. In a mixing chamber outside and in fluid communication with the primary chamber, superheated steam and gas are combined into a mixture which then enters the primary chamber through the orifice. At the point of impact of the ejector/superheated steam and the incoming gas/superheated steam mixture, a barrier is created to the gas attempting to enter the ejector chamber. This barrier, coupled with suitable vacuum pumping means and cooling means, serves to keep the steam ejector and primary chamber at a negative pressure, even though the primary chamber has an orifice to a region of higher pressure.

Hanson, Clark L. (Livermore, CA)

1982-01-01T23:59:59.000Z

260

Electrical breakdown of a bubble in a water-filled capillary  

SciTech Connect

In this Communication, the electrical breakdown of a static bubble in a water-filled capillary generated in a dc electrical field is studied. We present experimental results which indicate that the liquid layer between capillary and bubble wall can have an important influence on the breakdown mechanism of the bubble. The breakdown electrical field (atmospheric pressure) without a liquid layer in a (vapor) bubble is 18 kV/cm. When a liquid layer is present, the electrical breakdown of an air bubble is observed at electrical fields typically two times smaller. Local plasma formation is observed in this case possibly due to bubble deformation.

Bruggeman, P.J.; Leys, C.A.; Vierendeels, J. A. [Department of Applied Physics, Research Unit Plasma Technology (RUPT), Faculty of Engineering, Ghent University, Rozier 44, B-9000 Ghent (Belgium); Department of Flow, Heat and Combustion Mechanics, Faculty of Engineering, Ghent University, Sint-Pietersnieuwstraat 41, B-9000 Ghent (Belgium)

2006-06-01T23:59:59.000Z

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


261

Vacuum chamber for containing particle beams  

DOE Patents (OSTI)

A vacuum chamber for containing a charged particle beam in a rapidly changing magnetic environment comprises a ceramic pipe with conducting strips oriented along the longitudinal axis of the pipe and with circumferential conducting bands oriented perpendicular to the longitudinal axis but joined with a single longitudinal electrical connection. When both strips and bands are on the outside of the ceramic pipe, insulated from each other, a high-resistance conductive layer such as nickel can be coated on the inside of the pipe.

Harvey, A.

1985-11-26T23:59:59.000Z

262

Synthetic DNA Replication Bubbles Bound and Unwound with Twofold Symmetry by a Simian Virus 40 T-Antigen Double Hexamer  

Science Journals Connector (OSTI)

ARTICLE ANIMAL VIRUSES Synthetic DNA Replication Bubbles Bound and...examined the binding of TAgDH to synthetic DNA replication bubbles. Tests of...characterized the binding and unwinding of synthetic DNA replication bubbles by the TAgDH...

Natalia V. Smelkova; James A. Borowiec

1998-11-01T23:59:59.000Z

263

Micro Bubble Technologies Inc MBT | Open Energy Information  

Open Energy Info (EERE)

Micro Bubble Technologies Inc MBT Micro Bubble Technologies Inc MBT Jump to: navigation, search Name Micro Bubble Technologies, Inc (MBT) Place Barrington, Illinois Sector Carbon Product US-Korean maker of cleaner burning fuel and carbon nanotube batteries. Coordinates 41.740155°, -71.308294° 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":41.740155,"lon":-71.308294,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

264

Tiny Glass Bubbles With Big Potential | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Tiny Glass Bubbles With Big Potential Tiny Glass Bubbles With Big Potential Tiny Glass Bubbles With Big Potential August 19, 2011 - 12:32pm Addthis SRNL's Porous Walled Hollow Glass Microspheres (which are about half the width of a human hair in diameter) have a network of interconnected pores that enable them to be filled with, hold and release gases and other materials. | Image courtesy of SRNL SRNL's Porous Walled Hollow Glass Microspheres (which are about half the width of a human hair in diameter) have a network of interconnected pores that enable them to be filled with, hold and release gases and other materials. | Image courtesy of SRNL Liisa O'Neill Liisa O'Neill Former New Media Specialist, Office of Public Affairs What are the key facts? SRNL's porous walled glass microspheres allow the potential for

265

Magnetic Charge Can Locally Stabilize Kaluza-Klein Bubbles  

E-Print Network (OSTI)

We construct a new 2-parameter family of static topological solitons in 5D minimal supergravity which are endowed with magnetic charge and mass. The solitons are asymptotically ${\\mathbb R}^4\\times S^1$, where the radius of the $S^1$ has a lower bound $R_s\\ge R_{min}$. Setting up initial data on a Cauchy slice at a moment of time symmetry, we demonstrate that if $R_s>R_{min}$ these solitons correspond to a perturbatively stable "small" static bubble as well as an unstable "large" static bubble, whereas if $R_sbubbles. The energetics and thermodynamics of the magnetic black string are then discussed and it is shown that the locally stable bubble is the end point of a phase transition for an appropriate range of black string parameters.

Sean Stotyn; Robert B. Mann

2011-05-10T23:59:59.000Z

266

Magnetic Charge Can Locally Stabilize Kaluza-Klein Bubbles  

E-Print Network (OSTI)

We construct a new 2-parameter family of static topological solitons in 5D minimal supergravity which are endowed with magnetic charge and mass. The solitons are asymptotically ${\\mathbb R}^4\\times S^1$, where the radius of the $S^1$ has a lower bound $R_s\\ge R_{min}$. Setting up initial data on a Cauchy slice at a moment of time symmetry, we demonstrate that if $R_s>R_{min}$ these solitons correspond to a perturbatively stable "small" static bubble as well as an unstable "large" static bubble, whereas if $R_sbubbles. The energetics of the magnetic black string are then discussed and it is shown that the locally stable bubble is the end point of a phase transition for an appropriate range of black string parameters.

Stotyn, Sean

2011-01-01T23:59:59.000Z

267

Neutrino events at IceCube and the Fermi bubbles  

Science Journals Connector (OSTI)

We discuss the possibility that the IceCube neutrino telescope might be observing the Fermi bubbles. If the bubbles discovered in gamma rays originate from accelerated protons, they should be strong emitters of high energy (?GeV) neutrinos. These neutrinos are detectable as showerlike or tracklike events at a Km3 neutrino observatory. For a primary cosmic ray flux with spectrum ?E?2.1 and cutoff energy at or above 10PeV, the Fermi bubble flux substantially exceeds the atmospheric background, and could account for up to ?45 of the 28 events detected above ?30??TeV at IceCube. Running the detector for ?57 more years should be sufficient to discover this flux at high significance. For a primary cosmic ray flux with steeper spectrum, and/or lower cutoff energy, longer running times will be required to overcome the background.

Cecilia Lunardini; Soebur Razzaque; Kristopher T. Theodoseau; Lili Yang

2014-07-21T23:59:59.000Z

268

Fermi Gamma-Ray Bubbles from Stochastic Acceleration of Electrons  

Science Journals Connector (OSTI)

Gamma-ray data from Fermi Large Area Telescope reveal a bilobular structure extending up to ?50 above and below the Galactic Center. It has been argued that the gamma rays arise from hadronic interactions of high-energy cosmic rays which are advected out by a strong wind, or from inverse-Compton scattering of relativistic electrons accelerated at plasma shocks present in the bubbles. We explore the alternative possibility that the relativistic electrons are undergoing stochastic 2nd-order Fermi acceleration by plasma wave turbulence through the entire volume of the bubbles. The observed gamma-ray spectral shape is then explained naturally by the resulting hard electron spectrum modulated by inverse-Compton energy losses. Rather than a constant volume emissivity as in other models, we predict a nearly constant surface brightness, and reproduce the observed sharp edges of the bubbles.

Philipp Mertsch and Subir Sarkar

2011-08-23T23:59:59.000Z

269

Magnetic Low-Friction Track  

Science Journals Connector (OSTI)

The standard low-friction tracks used to test Newton's laws are the air track and the low-friction cart track. Both are commercially available and provide low-friction environments to test various physics concepts. At a recent science fair one of the authors (JG) presented a magnetically levitated cart and track. A literature search found no previous testing of magnetically levitated carts.1 This paper compares a magnetically levitated cart against the two standard low-friction tracks.

Mark Paetkau; Manpreet Bahniwal; James Gamblen

2008-01-01T23:59:59.000Z

270

The rheology of three-phase suspensions at low bubble capillary number  

Science Journals Connector (OSTI)

...results demonstrate that adding bubbles to a dilute particle suspension at low capillarity...increases its viscosity, while adding bubbles to a concentrated particle suspension decreases...particle anisometry and is easily extended to account for variable capillarity, but has...

2015-01-01T23:59:59.000Z

271

Lattice Boltzmann simulations of bubble formation in a microfluidic T-junction  

Science Journals Connector (OSTI)

...Sauro Succi and Stefano Ubertini Lattice Boltzmann simulations of bubble formation...York, New York, NY 10031USA A lattice Boltzmann equation method based on the...from 30. multi-phase flow|lattice Boltzmann method|bubble formation...

2011-01-01T23:59:59.000Z

272

Lattice Boltzmann simulation to study multiple bubble dynamics Amit Gupta, Ranganathan Kumar *  

E-Print Network (OSTI)

Lattice Boltzmann simulation to study multiple bubble dynamics Amit Gupta, Ranganathan Kumar Keywords: Lattice Boltzmann Bubble Two-phase Coalescence a b s t r a c t Lattice Boltzmann method (LBM) has

Gupta, Amit

273

Heat and mass transfer in bubble column dehumidifiers for HDH desalination  

E-Print Network (OSTI)

Heat and mass transfer processes governing the performance of bubble dehumidifier trays are studied in order to develop a predictive model and design rules for efficient and economical design of bubble column dehumidifiers ...

Tow, Emily W

2014-01-01T23:59:59.000Z

274

Stability of the equilibrium states of a charged bubble in a dielectric liquid  

Science Journals Connector (OSTI)

The stability of equilibrium states of a charged spherical bubble in dielectric fluid with respect to centrally ... a nonlinear equation describing radial oscillations of the bubble in the neighborhoods of its si...

A. I. Grigorev; A. N. Zharov

2000-04-01T23:59:59.000Z

275

Bubble Evolution in Liquid-Gas Solutions, Viewed as an Elementary Catastrophe  

Science Journals Connector (OSTI)

The stability of gas micro-bubbles in liquid-gas solutions is of importance ... which include propagation and damping of sound, bubble removal during glassmaking, fermentation, initiation of ... the role of nucle...

J. L. Achard; E. Canot

1993-01-01T23:59:59.000Z

276

Uniqueness, stability and Hessian eigenvalues for two-dimensional bubble clusters  

Science Journals Connector (OSTI)

A recent conjecture on two-dimensional foams suggested that for fixed topology with given bubble areas there is a unique state of ... counter-examples, consisting of a ring of bubbles around a central one, which ...

D. Weaire; S.J. Cox; F. Graner

2002-02-01T23:59:59.000Z

277

LED Price Tracking Form  

Energy.gov (U.S. Department of Energy (DOE))

DOE intends to update the SSL Pricing and Efficacy Trend Analysis for Utility Program Planning report on an annual basis, but doing so requires that we have sufficient product and purchase data including acquisition date, purchase price, product category, and rated initial lumens. Those interested in helping collect this data are asked to use the LED Price Tracking FormMicrosoft Excel and follow the instructions for submitting data.

278

A steerable UV laser system for the calibration of liquid argon time projection chambers  

E-Print Network (OSTI)

A number of liquid argon time projection chambers (LAr TPC's) are being build or are proposed for neutrino experiments on long- and short baseline beams. For these detectors a distortion in the drift field due to geometrical or physics reasons can affect the reconstruction of the events. Depending on the TPC geometry and electric drift field intensity this distortion could be of the same magnitude as the drift field itself. Recently, we presented a method to calibrate the drift field and correct for these possible distortions. While straight cosmic ray muon tracks could be used for calibration, multiple coulomb scattering and momentum uncertainties allow only a limited resolution. A UV laser instead can create straight ionization tracks in liquid argon, and allows one to map the drift field along different paths in the TPC inner volume. Here we present a UV laser feed-through design with a steerable UV mirror immersed in liquid argon that can point the laser beam at many locations through the TPC. The straight ionization paths are sensitive to drift field distortions, a fit of these distortion to the linear optical path allows to extract the drift field, by using these laser tracks along the whole TPC volume one can obtain a 3D drift field map. The UV laser feed-through assembly is a prototype of the system that will be used for the MicroBooNE experiment at the Fermi National Accelerator Laboratory (FNAL).

A. Ereditato; I. Kreslo; M. Lthi; C. Rudolf von Rohr; M. Schenk; T. Strauss; M. Weber; M. Zeller

2014-10-04T23:59:59.000Z

279

Phase Transition to an Opaque Plasma in a Sonoluminescing Bubble  

Science Journals Connector (OSTI)

Time-resolved spectrum measurements of a sonoluminescing Xe bubble reveal a transition from transparency to an opaque Planck blackbody. As the temperature is <10?000??K and the density is below liquid density, the photon scattering length is 10?000 times too large to explain its opacity. We resolve this issue with a model that reduces the ionization potential. According to this model, sonoluminescence originates in a new phase of matter with high ionization. Analysis of line emission from Xe* also yields evidence of phase segregation for this first-order transition inside a bubble.

Brian Kappus; Shahzad Khalid; Avik Chakravarty; Seth Putterman

2011-06-08T23:59:59.000Z

280

Radiopurity assessment of the tracking readout for the NEXT double beta decay experiment  

E-Print Network (OSTI)

The 'Neutrino Experiment with a Xenon Time-Projection Chamber' (NEXT) is intended to investigate the neutrinoless double beta decay of 136Xe, which requires a severe suppression of potential backgrounds; therefore, an extensive screening and selection process is underway to control the radiopurity levels of the materials to be used in the experimental set-up of NEXT. The detector design combines the measurement of the topological signature of the event for background discrimination with the energy resolution optimization. Separate energy and tracking readout planes are based on different sensors: photomultiplier tubes for calorimetry and silicon multi-pixel photon counters for tracking. The design of a radiopure tracking plane, in direct contact with the gas detector medium, was a challenge since the needed components have typically activities too large for experiments requiring ultra-low background conditions. Here, the radiopurity assessment of tracking readout components based on gamma-ray spectroscopy usi...

lvarez, V; Barrado, A I; Bettini, A; Borges, F I G M; Camargo, M; Crcel, S; Cebrin, S; Cervera, A; Conde, C A N; Conde, E; Dafni, T; Daz, J; Esteve, R; Fernandes, L M P; Fernndez, M; Ferrario, P; Ferreira, A L; Freitas, E D C; Gehman, V M; Goldschmidt, A; Gmez, H; Gmez-Cadenas, J J; Gonzlez-Daz, D; Gutirrez, R M; Hauptman, J; Morata, J A Hernando; Herrera, D C; Iguaz, F J; Irastorza, I G; Labarga, L; Laing, A; Liubarsky, I; Lorca, D; Losada, M; Luzn, G; Mar, A; Martn-Albo, J; Martnez, A; Martnez-Lema, G; Miller, T; Monrabal, F; Monserrate, M; Monteiro, C M B; Mora, F J; Moutinho, L M; Vidal, J Muoz; Nebot-Guinot, M; Nygren, D; Oliveira, C A B; de Solrzano, A Ortiz; Prez, J; Aparicio, J L Prez; Renner, J; Ripoll, L; Rodrguez, A; Rodrguez, J; Santos, F P; Santos, J M F dos; Segui, L; Serra, L; Shuman, D; Simn, A; Sofka, C; Sorel, M; Toledo, J F; Torrent, J; Tsamalaidze, Z; Veloso, J F C A; Villar, J A; Webb, R C; White, J T; Yahlali, N

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "bubble chamber tracks" 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

Viscous effects on the linear stability of a pulsanting bubble in acoustic fields  

Science Journals Connector (OSTI)

A linear stability theory of the harmonic motion of cavitation bubbles subject to an acoustic field with respect... $$\\sqrt {2\

Paolo Blondeaux

1985-12-01T23:59:59.000Z

282

Measurement and Compensation of BPM Chamber Motion in HLS  

SciTech Connect

Significant horizontal drifts in the beam orbit in the storage ring of HLS (Hefei Light Source) have been seen for many years. What leads to the motion of Beam Position Monitor (BPM) chamber is thermal expansion mainly caused by the synchrotron light. To monitor the BPM chamber motions for all BPMs, a BPM chamber motion measurement system is built in real-time. The raster gauges are used to measure the displacements. The results distinctly show the relation between the BPM chamber motion and the beam current. To suppress the effect of BPM chamber motion, a compensation strategy is implemented at HLS. The horizontal drifts of beam orbit have been really suppressed within 20{mu}m without the compensation of BPM chamber motion in the runtime.

Li, J. W.; Sun, B. G.; Cao, Y.; Xu, H. L.; Lu, P.; Li, C.; Xuan, K.; Wang, J. G. [NSRL, School of Nuclear Science and Technology, University of Science and Technology of China Hefei, Anhui230029 (China)

2010-06-23T23:59:59.000Z

283

Tests of a Novel Design of Resistive Plate Chambers  

E-Print Network (OSTI)

A novel design of Resistive Plate Chambers (RPCs), using only a single resistive plate, is being proposed. Based on this design, two large size prototype chambers were constructed and were tested with cosmic rays and in particle beams. The tests confirmed the viability of this new approach. In addition to showing an improved single-particle response compared to the traditional 2-plate design, the novel chambers also prove to be suitable for calorimetric applications.

Bilki, B; Freund, B; Neubser, C; Onel, Y; Repond, J; Schlereth, J; Xia, L

2015-01-01T23:59:59.000Z

284

Viscosity of magmas containing highly deformable bubbles M. Mangaa,*, M. Loewenbergb  

E-Print Network (OSTI)

Viscosity of magmas containing highly deformable bubbles M. Mangaa,*, M. Loewenbergb a Department The shear viscosity of a suspension of deformable bubbles dispersed within a Newtonian ¯uid is calculated. For small Ca, bubbles remain nearly spherical, and for suf®ciently large strains the viscosity of suspension

Manga, Michael

285

An Experimental Study of Bubble Formation in Asset Markets Using the Ttonnement Trading Institution  

E-Print Network (OSTI)

. Introduction Price bubbles are not a rare phenomenon. Indeed, there are many historical examples of commodity historical and contemporary relevance. The results show that bubbles are significantly reduced, suggesting Markets, Price Bubbles, Trading Institutions, Tâtonnement * Corresponding author. Address: Department

286

Bubble tree convergence for the harmonic sequence of harmonic surfaces in CPn  

E-Print Network (OSTI)

] and there are no necks [15], i.e. the energy of the bubble tree map is the limit of the energies of the sequenceBubble tree convergence for the harmonic sequence of harmonic surfaces in CPn Mo Xiaohuan and Sun holomorphic (or anti- holomorphic) map from M to CPn , or a "bubble tree limit" consisting of a har- monic map

Lu, Tiao

287

Correlation of black oil properties at pressures below the bubble-point  

E-Print Network (OSTI)

correlations: Bubble-point pressure, Pb *Solution gas-oil-ratio at pressures below the bubble-point, Rs Oil formation volume factor at pressures below the bubble-point, B0 In this work we provide a detailed analysis of the most popular correlations...

Velarde, Jorge Javier

2012-06-07T23:59:59.000Z

288

Bubble transport in three-dimensional laminar gravity-driven flow numerical results  

E-Print Network (OSTI)

Bubble transport in three-dimensional laminar gravity-driven flow ­ numerical results Laurent Pilon is the second part of a study on bubble transport, growth and shrinkage in three-dimensional gravity driven flow equation is solved for the bubble density function using the backward method of characteristics. The zeroth

Pilon, Laurent

289

Bubble Clusters: An Interface for Manipulating Spatial Aggregation of Graphical Objects  

E-Print Network (OSTI)

Bubble Clusters: An Interface for Manipulating Spatial Aggregation of Graphical Objects Nayuko recognized as a group, and the group structure is visualized as a two-dimensional bubble surface that surrounds the objects. Users can drag, copy, or delete a group by operat- ing on the bubble. Furthermore

Igarashi, Takeo

290

Under consideration for publication in J. Fluid Mech. 1 Volume Displacement Effects During Bubble  

E-Print Network (OSTI)

Under consideration for publication in J. Fluid Mech. 1 Volume Displacement Effects During Bubble bubbles are entrained in a traveling vortex ring, it has been shown that even at extremely low volume the bubbles are assumed subgrid and momentum point-sources are used to model their effect on the flow

Apte, Sourabh V.

291

Bubble suspension rheology and implications for conduit flow E.W. Llewellina,T, M. Mangab  

E-Print Network (OSTI)

Bubble suspension rheology and implications for conduit flow E.W. Llewellina,T, M. Mangab 94720-4760, USA Received 5 February 2004; accepted 1 September 2004 Abstract Bubbles are ubiquitous in magma during eruption and influence the rheology of the suspension. Despite this, bubble- suspension

Manga, Michael

292

Applied Numerical Mathematics 34 (2000) 373379 The fastest smooth Taylor bubble  

E-Print Network (OSTI)

Applied Numerical Mathematics 34 (2000) 373­379 The fastest smooth Taylor bubble Prabir Daripa nature of singularities associated with topological transition in the plane Taylor-bubble problem is briefly discussed in the context of estimating the speed of the fastest smooth Taylor-bubble

Daripa, Prabir

293

Monitoring bubble growth in supersaturated blood and tissue ex vivo and the relevance to  

E-Print Network (OSTI)

Monitoring bubble growth in supersaturated blood and tissue ex vivo and the relevance to marine as a means to induce bubble nucleation and growth in supersatu- rated ex vivo bovine liver and kidney tissues, and blood. Bubble detection was achieved with a diagnostic ultrasound scanner. Under the conditions

294

Bubble Pinch-Off in a Rotating Flow Raymond Bergmann,1  

E-Print Network (OSTI)

Bubble Pinch-Off in a Rotating Flow Raymond Bergmann,1 Anders Andersen,1 Devaraj van der Meer,2 December 2008; revised manuscript received 12 March 2009; published 22 May 2009) We create air bubbles of the needlelike surface dip is unstable at high rotation rates and releases bubbles which are carried down

295

Bubble dynamics atop an oscillating substrate: Interplay of compressibility and contact angle hysteresis  

E-Print Network (OSTI)

Bubble dynamics atop an oscillating substrate: Interplay of compressibility and contact angle online 19 October 2011) We consider a sessile hemispherical bubble sitting on the transversally oscillating bottom of a deep liquid layer and focus on the interplay of the compressibility of the bubble

Straube, Arthur V.

296

Photosensitive, Bubble-free, Bromate-1,4-Cyclohexanedione Oscillating Reactions. Illumination Control of Pattern Formation  

E-Print Network (OSTI)

ARTICLES Photosensitive, Bubble-free, Bromate-1,4-Cyclohexanedione Oscillating Reactions,4-cyclohexanedione bubble-free oscillating reaction with added Ru(bpy)3 2+, ferroin, or diphenylamine as the third as the reductant. The combination of photosensitivity and absence of bubbles makes these reactions convenient tools

Epstein, Irving R.

297

Emergent Behavior in a Low-Order Fluidized-Bed Bubble Model  

E-Print Network (OSTI)

Emergent Behavior in a Low-Order Fluidized-Bed Bubble Model John S. Halow National Energy of this type of model to describe the dynamics of voids in bubbling fluidized beds. The model considers vertical interactions between neighboring bubbles in fluidized beds. Emergent collective behavior is shown

Tennessee, University of

298

Bubble and droplet motion in binary mixtures: Evaporation-condensation mechanism and Marangoni effect  

E-Print Network (OSTI)

Bubble and droplet motion in binary mixtures: Evaporation-condensation mechanism and Marangoni 2009; published 14 April 2009 Bubble and droplet motion in binary mixtures is studied in weak heat a crossover concentration c inversely proportional to the radius R of the bubble or droplet. Here c is usually

299

The thickness of the falling film of liquid around a Taylor bubble  

Science Journals Connector (OSTI)

...falling film of liquid around a Taylor bubble E. W. Llewellin 1 * E. Del Bello 2...falling film of liquid around a Taylor bubble, when liquid-gas interfacial tension...down a plane surface and around a Taylor bubble, and develop a theoretical model for...

2012-01-01T23:59:59.000Z

300

Supra-bubble regime for laser acceleration of cold electron beams in tenuous plasma  

E-Print Network (OSTI)

Supra-bubble regime for laser acceleration of cold electron beams in tenuous plasma V. I. Geyko,1 I 2010 Relativistic electrons can be accelerated by an ultraintense laser pulse in the "supra-bubble" regime, that is, in the blow-out regime ahead of the plasma bubble as opposed to the conventional method

Note: This page contains sample records for the topic "bubble chamber tracks" 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

Bubble nucleation as a trigger for xenolith entrapment in mantle melts  

E-Print Network (OSTI)

Bubble nucleation as a trigger for xenolith entrapment in mantle melts Nadav G. Lensky a,b,, Ron W to partial crystallization. Following nucleation, the bubbles grow and, if magma volume is confined, the surrounding rock may fracture. We performed experiments on the nucleation of CO2 bubbles in mafic alkaline

Lyakhovsky, Vladimir

302

Single bubble rising dynamics for moderate Reynolds number using Lattice Boltzmann Method  

E-Print Network (OSTI)

Single bubble rising dynamics for moderate Reynolds number using Lattice Boltzmann Method Luz Amaya November 2009 Accepted 4 March 2010 Available online 18 March 2010 Keywords: Bubble rising Lattice Boltzmann Method Large viscosity ratio a b s t r a c t Dynamics of a single rising gas bubble is studied

Frey, Pascal

303

Controlling bubble motion over heated surface through evaporation momentum force to enhance pool boiling heat transfer  

E-Print Network (OSTI)

Controlling bubble motion over heated surface through evaporation momentum force to enhance pool/APPLAB/v102/i5 Published by the American Institute of Physics. Related Articles Dynamics of micro-bubble sonication inside a phantom vessel Appl. Phys. Lett. 102, 013702 (2013) Bubble-driven inertial micropump Phys

Kandlikar, Satish

304

Bubble entrainment by breaking waves and their influence on optical scattering in the upper ocean  

E-Print Network (OSTI)

Bubble entrainment by breaking waves and their influence on optical scattering in the upper ocean's surface inject bubbles and turbulence into the water column. During periods of rough weather the scales and the turbulent transport of bubbles to depth. Depending on their concentrations and size distribution

Stramski, Dariusz

305

BUBBLE STABILIZATION OF DISCONTINUOUS GALERKIN PAOLA ANTONIETTI, FRANCO BREZZI, AND L. DONATELLA MARINI  

E-Print Network (OSTI)

BUBBLE STABILIZATION OF DISCONTINUOUS GALERKIN METHODS PAOLA ANTONIETTI, FRANCO BREZZI, AND L. DONATELLA MARINI Abstract. We analyze the stabilizing effect of the introduction of suitable bubble, can be used if suitable bubbles are added to the local spaces ( 1. Introduction Most commonly used DG

Brezzi, Franco

306

Simulation of bubble migration in a turbulent boundary layer M. Mattson and K. Mahesha  

E-Print Network (OSTI)

Simulation of bubble migration in a turbulent boundary layer M. Mattson and K. Mahesha Aerospace of bubbles injected into a turbulent boundary layer. The Reynolds number of the turbulent boundary layer varies from 420 Re 1800, and the bubble Reynolds number Reb 1. Simulation parameters were chosen to match

Mahesh, Krishnan

307

Bubble Contact Angle Method for Evaluating Substratum Interfacial Characteristics and Its Relevance to Bacterial Attachment  

Science Journals Connector (OSTI)

...research-article General Microbial Ecology Bubble Contact Angle Method for Evaluating Substratum...New South Wales 2033, Australia. A bubble contact angle method was used to determine...hydrophilic, giving an angle of 29 or less. Bubble contact angles at the surfaces exposed...

Madilyn Fletcher; K. C. Marshall

1982-07-01T23:59:59.000Z

308

Modelling bubble rise and interaction with a glass Rogerio Manica1*  

E-Print Network (OSTI)

Modelling bubble rise and interaction with a glass surface Rogerio Manica1* , Maurice H. W. Hendrix A theoretical model has been developed to analyse experimental data of millimetre- size bubbles rising under for bubble deformations on the micrometre scale in the interaction zone with quantitative precision

Chan, Derek Y C

309

Bubble transport in three-dimensional laminar gravity-driven flow mathematical formulation  

E-Print Network (OSTI)

Bubble transport in three-dimensional laminar gravity-driven flow ­ mathematical formulation This paper presents a complete set of coupled equations that govern the bubble transport in three-dimensional gravity-driven flow. The model accounts for bubble growth or shrinkage due to pressure and temperature

Pilon, Laurent

310

The effect of soluble surfactant on the transient motion of a buoyancy-driven bubble  

E-Print Network (OSTI)

The effect of soluble surfactant on the transient motion of a buoyancy-driven bubble Savas Tasoglu of a bubble rising in an otherwise quiescent liquid contained in an axisymmetric tube is computationally. The nearly spherical, ellipsoidal, and dimpled ellipsoidal-cap regimes of bubble motion are examined

Demirci, Utkan

311

Permanent Bubble Arrays from a Cross-Linked Poly(para-phenyleneethynylene): Picoliter Holes without Microfabrication  

E-Print Network (OSTI)

Permanent Bubble Arrays from a Cross-Linked Poly(para-phenyleneethynylene): Picoliter Holes without). The holes are formed by heating self-assembled bubble arrays (from 4) to 300 °C. They will be useful evaporating solvents generate hexagonally ordered bubble arrays when moist air is used to evaporate

Srinivasarao, Mohan

312

The Connection between Bubble Size Spectra and Energy Dissipation Rates in the Upper Ocean  

Science Journals Connector (OSTI)

A formula for the maximum size of a bubble for which surface tension forces can prevent bubble breakup by inertial forces, combined with the observed sizes of air bubbles in breaking waves, implies an energy dissipation rate. One dataset from the ...

Chris Garrett; Ming Li; David Farmer

2000-09-01T23:59:59.000Z

313

Pattern formation on the surface of a bubble driven by an acoustic field  

Science Journals Connector (OSTI)

...the laboratory, including bubble sizing (Leighton et al. 1996...of the shape chosen by the bubble in steady state, there is...the eigenvalues of the linear stability problem is small, causing...observations of patterns on the bubble wall have been reported in...

2012-01-01T23:59:59.000Z

314

Acoustic resonances in the bubble plume formed by a plunging water jet  

Science Journals Connector (OSTI)

...low-frequency acoustic signature of the bubble plume in the tank. pressure...sound-pressure field from the bubble plume at frequencies up to...the plume. As a check on the stability of the peaks in the spectrum...hydrophone was moved relative to the bubble plume, and the eigenfrequencies...

2003-01-01T23:59:59.000Z

315

Lattice Boltzmann simulations of bubble formation in a microfluidic T-junction  

Science Journals Connector (OSTI)

...factors that affect the bubble formation process...based on accuracy and stability. This study uses D...Kreutzer2009Flows around confined bubbles and their importance...Kumar2009Droplet formation and stability of flows in a microfluidic...and T. Lee2010Single bubble rising dynamics for...

2011-01-01T23:59:59.000Z

316

BUBBLE STABILIZATION OF DISCONTINUOUS GALERKIN PAOLA F. ANTONIETTI, FRANCO BREZZI, AND L. DONATELLA MARINI  

E-Print Network (OSTI)

BUBBLE STABILIZATION OF DISCONTINUOUS GALERKIN METHODS PAOLA F. ANTONIETTI, FRANCO BREZZI, AND L. DONATELLA MARINI Abstract. We analyze the stabilizing effect of the introduction of suitable bubble, by definition, a function whose support is contained in a single element. The bubble stabilization, in its turn

Marini, Donatella

317

On the origins of unsteadiness and three-dimensionality in a laminar separation bubble  

Science Journals Connector (OSTI)

...instabilities in separation bubbles. Aero. J. 99, 439...Linear and nonlinear stability of the Blasius boundary...of laminar separation bubbles caused by natural transition...dimensional laminar separation bubbles as result of linear...Th. 1997 Parabolized stability equations. A. Rev...

2000-01-01T23:59:59.000Z

318

Critical strength of an electric field whereby abubble can adopt a steady shape  

Science Journals Connector (OSTI)

...revisit the problem of the stability of a gas bubble in a liquid, without requiring...predicts one solution branch and bubble stability for all values of W considered...and S. O. Shiryaeva 1999 Stability of a bubble in a dielectric liquid in...

2009-01-01T23:59:59.000Z

319

Steady axisymmetric motion of a small bubble in a tube with flowing liquid  

Science Journals Connector (OSTI)

...axisymmetric motion of a small bubble in a tube with flowing liquid...behaviour of a relatively small bubble moving with a flowing liquid...method to the problem of elastic stability. J. Appl. Mech. 39, 1060-1065...Kiss 1986 On the motion of bubbles in capillary tubes. J. Fluid...

2010-01-01T23:59:59.000Z

320

Formation and stability of oxygen-rich bubbles that shape photosynthetic mats  

E-Print Network (OSTI)

Formation and stability of oxygen-rich bubbles that shape photosynthetic mats T. BOSAK,1 J. W. M and stability of oxygen-rich bubbles enmeshed by filamentous cyanobacteria. Sub-millimetric and millimetric bubbles can be stable for weeks and even months. During this time, lithifying organic-rich lami- nae

Bush, John W.M.

Note: This page contains sample records for the topic "bubble chamber tracks" 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

Instabilities in two-dimensional flower and chain clusters of bubbles M. A. Fortes1  

E-Print Network (OSTI)

, clusters, Surface Evolver, bubbles, foams 1 #12;1.Introduction Considerable attention has been given multiplied by the film energy per unit length or film tension . We therefore identify cells with bubbles the stability of the equilibria of two types of 2D finite clusters of bubbles: 1) flower clusters with N shells

Cox, Simon

322

The evolution of an axi-symmetric Stokes bubble with volumetric change  

E-Print Network (OSTI)

at the bubble boundary and is the surface tension. The interfacial kinematic condition 4 #12;requires dx dt n volume is changed. Linear stability analysis shows that an expanding spherical bubble is stable, while. We present the equations of the bubble motion in Section 2, and perform a linear stability analysis

323

A model for large amplitude oscillations of coated bubbles accounting for buckling and rupture  

E-Print Network (OSTI)

stabilizes the bubbles and prevents their coalescence. Pulmonary alveoli in the lungs have a li- pidic coating for the same reason.1 The coating modifies the effective surface tension. Since surface tension of the bubble surface: however, in practice, insonifying contrast agent bubbles produces oscillations with large

Marmottant, Philippe

324

Mechanism of mass transfer between a bubble initially composed of oxygen and molten glass1  

E-Print Network (OSTI)

Mechanism of mass transfer between a bubble initially composed of oxygen and molten glass1 F ­ BP 135, 93303 Aubervilliers Cedex, France Abstract The bubble removal from molten glass is an important problem in glass melting process. In this paper, the mass transfer undergone by a bubble rising

Boyer, Edmond

325

Isothermally heatsunk diffusion cloud chamber refrigerator  

SciTech Connect

This patent describes a diffusion cloud chamber isothermally heatsunk refrigerator which comprises: a heatsink consisting of two phases of a saturated substance existing in thermodynamic equilibrium at constant pressure and therefore at constant temperature, contained in a reservoir; a means of pressure damping to maintain constant pressure, as the ratio of the two phases present changes and introduces volumetric changes in the substance; a cooling member which transfer heat from vapor in contact with the cooling member surface to the ''cold side'' of a Peltier thermoelectric element with which the cooling member is in thermal contact; a Peltier thermoelectric element which removes the heat supplied by the cooling member from its ''cold side'' and pumps it to the ''hot side'' when driven by an electric current; and a means of transferring heat from the ''hot side'' of the Peltier thermoelectric element to the two-phase isothermal substance in the reservoir.

Menocal, S.G.

1987-05-05T23:59:59.000Z

326

Concept for Reducing Hall Thruster Chamber Wall Erosion with...  

NLE Websites -- All DOE Office Websites (Extended Search)

Concept for Reducing Hall Thruster Chamber Wall Erosion with Lithium Vapor Shielding. Hall thrusters have been established as a compact and reliable means for satellite...

327

Dielectric liquid ionization chambers for detecting fast neutrons  

E-Print Network (OSTI)

Three ionization chambers with different geometries have been constructed and filled with dielectric liquids for detection of fast neutrons. The three dielectric liquids studied were Tetramethylsilane (TMS), Tetramethylpentane ...

Boyd, Erin M

2008-01-01T23:59:59.000Z

328

Circle Track Magazine Project GREEN: New Smyrna Track Testing...  

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

catalytic convertors (100 CPI) Data was analyzed and the petroleum displacementGHG reduction determined Race demonstration 13 La Crosse Speedway - mile asphalt track...

329

Bubbles and drops in superheated and supercooled nuclear matter  

Science Journals Connector (OSTI)

Equilibrium solutions of bubbles and drops in superheated and supercooled nuclear matter are studied. The existence of such objects is shown to depend on several factors including Coulomb energy, surface tension, hydrodynamic stability, and fissility. We suggest conditions under which such objects might be formed in the laboratory.

Bao-An Li; Scott Pratt; Philip J. Siemens

1988-04-01T23:59:59.000Z

330

Relativistic detonation waves and bubble growth in false vacuum decay  

Science Journals Connector (OSTI)

After reviewing the current understanding of relativistic shock waves, a detailed analysis of relativistic detonation waves is presented. It is proposed that the motion of a detonation wave is analogous to the growth of a bubble nucleated during false vacuum decay at finite temperatures. Some possible applications of these results to cosmology are discussed.

Paul Joseph Steinhardt

1982-04-15T23:59:59.000Z

331

Geometrical Arrangements of a Collection of Bubbles Roman urikovic  

E-Print Network (OSTI)

. ____________________________________________________________________________________________________________________________________ G ­ slovenský casopis pre geometriu a grafiku, rocník 2 (2005), císlo 1, s. 7 - 16 7 #12;RomanGeometrical Arrangements of a Collection of Bubbles Roman urikovic Faculty of Mathematics, Physics and Informatics Comenius University, Slovakia email: roman.durikovic@fmph.uniba.sk Abstrakt V tomto clánku

Durikovic, Roman

332

Low?frequency sound radiation and scattering from bubble clouds.  

Science Journals Connector (OSTI)

Recent experimental evidence has shown that when wave breaking occurs low?frequency (LF?200 Hz) sound is produced and LF scatter has a different characteristic than expected from rough sea surface scattering. These effects have been attributed to the bubbles produced during wave breaking which are convected to depth by the breaking turbulence vorticity and Langmuir circulation as observed by Thorpe [S. Thorpe Oceanic White Caps edited by E. Monahan and G. MacNiocaill (Reidel Boston 1986) pp. 5758]. While the radiation and scatteringcharacteristics at frequencies greater than 1 kHz are explained by incoherent scatter from the observed bubble size and space distributions the lower frequency phenomena are not easily explained. However if bubble plumes and clouds produced in the wave breaking have appreciable volume fractions (?10?5) then LF sound radiation and scattering can be explained by classical theories. This paper reviews the scattering and radiation from bubbleclouds in water as a function of volume fraction. When the cloud is compact coherent and collective scatter are shown to occur. The natural frequency of radiation is shown to be described by a modified Minnaert result while the backscatter target strength is described by the first?order volume mode. These analytical results agree with experimental sound radiation and scatter measurements. Finally the collective radiation of bubble plumes and clouds is discussed as a possible explanation of the observed ocean low?frequency scattering and radiation phenomena. [Work sponsored by ONR 11250A and NUSC IR.

William M. Carey

1992-01-01T23:59:59.000Z

333

Direct Simulation of Argon Rectification in Single Bubble Sonoluminescence  

E-Print Network (OSTI)

collapse when the bubble is hot. The gases will react with water vapor to form soluble species, which into the liquid. The flux of stable dissolved gas species from the liquid (such as argon, nitrogen, hydrogen, there is still an incomplete quantitative prediction of the phenomena. Recently, the importance of water vapor

Storey, Brian D.

334

Kinetic Model of Gas Bubble Dissolution in Groundwater and Its  

E-Print Network (OSTI)

that rely on the actual dissolved gas content of gases such as oxygen or nitrogen. To describe the bubble of this excess gas is controlled by the solubility and the molecular diffusivity of the gases considered to water in the pore space. In the case of noble gases in a through-flow system, solubility differences

Aeschbach-Hertig, Werner

335

The volume scattering function of natural bubble populations  

Science Journals Connector (OSTI)

tion from high winds to low, with a view toward the use of these novel observations to ...... between bubble size spectra and energy dissipation rates in the upper ocean. ... Land-ocean interac- tions in the coastal zone: Implementation plan, 33.

2002-08-26T23:59:59.000Z

336

Aeration Due to Breaking Waves. Part I: Bubble Populations  

Science Journals Connector (OSTI)

The population of bubbles produced by breaking waves in (10 m) winds of up to 12 m s?1 is analyzed using calibrated images from a vertical pencil-beam sonar system placed on the seabed near the Dutch coast. The structure in the images is ...

A. Graham; D. K. Woolf; A. J. Hall

2004-05-01T23:59:59.000Z

337

Star formation around the mid-infrared bubble CN 148  

E-Print Network (OSTI)

We present a multi-wavelength study to analyse the star formation process associated with the mid-infrared bubble CN 148 (H II region G10.3-0.1), which harbors an O5V-O6V star. The arc-shaped distribution of molecular CO(2-1) emission, the cold dust emission, and the polycyclic aromatic hydrocarbon features trace a photodissociation region (PDR) around the H II region. We have identified 371 young stellar objects (YSOs) in the selected region and, interestingly, their spatial distribution correlates well with the PDR. 41% of these YSOs are present in 13 clusters, each having visual extinction larger than 16 mag. The clusters at the edges of the bubble (both northeast and southwest) are found to be relatively younger than the clusters located further away from the bubble. We also find that four 6.7 GHz methanol masers, two Extended Green Objects, an ultra-compact H II region, and a massive protostar candidate (as previously reported) are spatially positioned at the edges of the bubble. The existence of an appa...

Dewangan, L K; Grave, J M C; Mallick, K K

2014-01-01T23:59:59.000Z

338

Congenital Duodenal Obstruction and Double-Bubble Sign  

Science Journals Connector (OSTI)

Figure 1. A 1080-g girl was born at a gestational age of 29 weeks because of premature rupture of membranes. Enteral feeding was not tolerated. The infant's condition deteriorated, with nonbilious vomiting and a lack of stools. Abdominal radiography showed the double-bubble sign.

Correia-Pinto J.; Ribeiro A.

2014-09-11T23:59:59.000Z

339

The oil price really is a speculative bubble  

E-Print Network (OSTI)

The oil price really is a speculative bubble. Yet only recently has the U.S. Congress, for example, showed recognition that this might even be a possibility. In general there seems to be a preference for the claim that the ...

Eckaus, Richard S.

2008-01-01T23:59:59.000Z

340

Acceleration of Preconditioned Krylov Solvers for Bubbly Flow Problems  

E-Print Network (OSTI)

eigen- values in the spectrum of M-1 A, see also [13]. This phenomenon also holds if we use other, preconditioning, sym- metric positive semi-definite matrices, bubbly flow problems. 1 Introduction Recently of this method is solving the symmetric and positive semi-definite (SPSD) linear system on each time step, which

Vuik, Kees

Note: This page contains sample records for the topic "bubble chamber tracks" 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

Parallel plate avalanche chamber as an endcap detector for Time Projection Chamber  

SciTech Connect

A small, 10 x 10 cm/sup 2/, parallel plate avalanche counter has been tested paying special attention to those features which can be important in the Time Projection Chamber. The structure of the test chamber is shown. It has a conversion and drift volume, 11 mm thick, delimited by two stainless steel cross wire grids, of 100 ..mu..m wire diameter and 500 ..mu..mm pitch, identified by HV1 and HV2. The anode is made of thick wires, 100 ..mu..m in diameter spaced every 500 ..mu..m. The amplification gap is 4 mm thick. Below the anode, 1 mm apart, we have paced an identical wire plane, HV4, with wires perpendicular to the anode wires. Both electrodes are equipped with electronics and read out. All measurements were performed with a mixture of argon and methane (83% - 17%), a typical gas for Time Projection Chambers. A multiplication factor up to 10/sup 5/ was attained.

Peisert, A.

1984-01-01T23:59:59.000Z

342

Hydrodynamic Stability Analysis of Burning Bubbles in Electroweak Theory and in QCD  

E-Print Network (OSTI)

Assuming that the electroweak and QCD phase transitions are first order, upon supercooling, bubbles of the new phase appear. These bubbles grow to macroscopic sizes compared to the natural scales associated with the Compton wavelengths of particle excitations. They propagate by burning the old phase into the new phase at the surface of the bubble. We study the hydrodynamic stability of the burning and find that for the velocities of interest for cosmology in the electroweak phase transition, the shape of the bubble wall is stable under hydrodynamic perturbations. Bubbles formed in the cosmological QCD phase transition are found to be a borderline case between stability and instability.

P. Huet; K. Kajantie; R. G. Leigh; B. -H. Liu; L. McLerran

1992-12-05T23:59:59.000Z

343

REC Tracking Systems Design Guide  

SciTech Connect

OAK-B135 The Design Guide is presented in three parts. Section II describes the need for REC tracking, the two principal tracking methods available, and, in simple terms, the operation of certificate-based systems. Section III presents the major issues in the design of certificate-based tracking systems and discusses the advantages and disadvantages of alternative solutions. Finally, Section IV offers design principles or recommendations for most of these issues.

Meredith Wingate

2004-02-03T23:59:59.000Z

344

Model of bubble velocity vector measurement in upward and downward bubbly two-phase flows using a four-sensor optical probe  

Science Journals Connector (OSTI)

Abstract The knowledge of bubble behaviors is of considerable significance for a proper understanding and modeling of two-phase flows. To obtain the information on the bubble motion, a novel model was developed, by which the bubble velocity vector can be directly calculated from six time intervals measured with a four-sensor probe. The measurements of local bubble velocity vector and void fraction were performed in both upward and downward bubbly flows by using a four-sensor optical probe. The area-averaged void fraction and bubble velocity obtained from the probe agree well with those measured by other cross-calibration methods, and the measurement errors are within 15% under various flow conditions. Experimental results of the bubble velocity vector reveal that the bubble lateral migration may be suppressed in upward flows, but be strengthened in downward flows as the liquid flow rate increases. Also, with an increase in gas flow rate, the bubble velocity distribution varies into the powerlaw profile in upward flows, but into an off-center peak profile in downward flows. In addition, the void fraction shows a core peak distribution at low void fraction for downward flows, but a wall peak distribution for upward flows. However, when the void fraction is relatively high, it displays an off-center peak distribution for downward flows but a core peak distribution for upward flows.

Daogui Tian; Changqi Yan; Licheng Sun

2015-01-01T23:59:59.000Z

345

Legal Management Tracking System Page  

NLE Websites -- All DOE Office Websites (Extended Search)

Legal Management Tracking System Page 1 of 1 Back to Case Costs Contractor Litigation - Law Firm Invoices Office: Richland Operations Office Parties: DWAYNE HALL v. FLUOR HANFORD,...

346

TOWER-TRACKING HELIOSTAT ARRAY.  

E-Print Network (OSTI)

?? This thesis presents a method of tracking and correcting for the swaying of a central receiver tower in concentrated solar production plants. The method (more)

Masters, Joel T

2011-01-01T23:59:59.000Z

347

A model for nonlinear oscillations of a gas bubble in liquids.  

Science Journals Connector (OSTI)

It is well known that the damped bubble oscillation due to finite heat exchange with surrounding liquid displays an available power loss where there is entropy production. However the nonlinear bubble analysis using a polytropic relation of the form PV n =const (P is the pressure inside the bubble V is the bubble volume and n is the polytropic exponent) fails to account for such thermal damping. In this study a self?consistent model for the dynamics of a spherical bubble driven into oscillation in a liquid by employing the energy equation and the equation of state for a vapor inside a bubble and the momentum and energy equations for the surrounding liquid is formulated. The heat transfer between vapor inside the bubble and the surrounding liquid is assumed to occur through the thin boundary layer adjacent to the bubble wall. The heat transfer due to an instantaneous temperature distribution inside the bubble is also considered in this analysis. The calculated frequency response curves for the forced oscillation of a bubble are quite different from the ones obtained by the analysis using the polytropic relation. Calculation results show that the amplitude peak corresponding to the fundamental resonance during a steady oscillation for a 10?25??m?diam bubble is 20% less than the value obtained by the polytropic model.

Jei?Cheong Ryu; Ho?Young Kwak

1991-01-01T23:59:59.000Z

348

Overview of Chamber and Power Plant Designs for IFE  

E-Print Network (OSTI)

, to be published in 2011, (ISBN 9780470894392) I will review some of the more complete integrated design studies&E are choice of materials, chamber and building design, tritium inventory, design of tritium processing systemsOverview of Chamber and Power Plant Designs for IFE Wayne Meier Deputy Program Leader Fusion Energy

349

Heart chambers and whole heart segmentation techniques: review  

E-Print Network (OSTI)

Heart chambers and whole heart segmentation techniques: review Dongwoo Kang Jonghye Woo Piotr J://electronicimaging.spiedigitallibrary.org/ on 01/15/2014 Terms of Use: http://spiedl.org/terms #12;Heart chambers and whole heart segmentation, and reproducible segmentation methods. Figure 1 illustrates an example of segmentation of heart on CT scan. A

Kuo, C.-C. "Jay"

350

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

SciTech Connect

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

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

2013-09-15T23:59:59.000Z

351

Heat transfer to a horizontal cylinder in a shallow bubble column  

Science Journals Connector (OSTI)

Abstract Heat transfer coefficient correlations for tall bubble columns are unable to predict heat transfer in shallow bubble columns, which have unique geometry and fluid dynamics. In this work, the heat transfer coefficient is measured on the surface of a horizontal cylinder immersed in a shallow airwater bubble column. Superficial velocity, liquid depth, and cylinder height and horizontal position with respect to the sparger orifices are varied. The heat transfer coefficient is found to increase with height until reaching a critical height, and a dimensionless, semi-theoretical correlation is developed that incorporates superficial velocity, liquid properties, and height. Additionally, the more minor effects of flow regime, column region, and bubble impact are discussed. Notably, the heat transfer coefficient can be as high in the region of bubble coalescence as in the bulk of the column, but only if bubbles impact the cylinder. The correlation and discussion provide a framework for modeling and designing shallow, coil-cooled bubble columns.

Emily W. Tow; John H. Lienhard V

2014-01-01T23:59:59.000Z

352

NIF Target Chamber Dedicated | National Nuclear Security Administration  

NLE Websites -- All DOE Office Websites (Extended Search)

NIF Target Chamber Dedicated | National Nuclear Security Administration NIF Target Chamber Dedicated | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Home > About Us > Our History > NNSA Timeline > NIF Target Chamber Dedicated NIF Target Chamber Dedicated June 11, 1999 Livermore, CA NIF Target Chamber Dedicated Secretary Richardson dedicates the National Ignition Facility target

353

A mechanical mode-stirred reverberation chamber with chaotic geometry  

E-Print Network (OSTI)

A previous research on multivariate approach to the calculation of reverberation chamber correlation matrices is used to calculate the number of independent positions in a mode-stirred reverberation chamber. Anomalies and counterintuitive behavior are observed in terms of number of correlated matrix elements with respect to increasing frequency. This is ascribed to the regular geometry forming the baseline cavity (screened room) of a reverberation chamber, responsible for localizing energy and preserving regular modes (bouncing ball modes). Smooth wall deformations are introduced in order to create underlying Lyapunov instability of rays and then destroy survived regular modes. Numerical full-wave simulations are performed for a reverberation chamber with corner hemispheres and (off-)center wall spherical caps. Field sampling is performed by moving a mechanical carousel stirrer. It is found that wave-chaos inspired baseline geometries improve chamber performances in terms of lowest usable frequencies and number of independent cavity realizations of mechanical stirrers.

Gabriele Gradoni; Franco Moglie; Valter Mariani Primiani

2014-07-06T23:59:59.000Z

354

Vacuum chamber for 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. A predetermined number of pairs of surfaces are disposed in one or more chambers, forming a multiple-layer ion mobility cyclotron device.

Chen, Tsung-Chi; Tang, Keqi; Ibrahim, Yehia M; Smith, Richard D; Anderson, Gordon A; Baker, Erin M

2014-12-09T23:59:59.000Z

355

Design and Construction of Large Size Micromegas Chambers for the ATLAS Upgrade of the Muon Spectrometer  

E-Print Network (OSTI)

Large area Micromegas detectors will be employed fo r the first time in high-energy physics experiments. A total surface of about 150 m$^2$ of the forward regions of the Muon Spectrometer of the ATLAS detector at LHC will be equipped with 8-layer Micromegas modules. Each module extends over a surface from 2 to 3 m$^2$ for a total active area of 1200 m$^2$. Together with the small strip Thin Gap Chambers they will compose the two New Small Wheels, which will replace the innermost stations of the ATLAS endcap muon tracking system in the 2018/19 shutdown. In order to achieve a 15% transverse momentum resol ution for 1 TeV muons, in addition to an excellent intrinsic resolution, the mechanical prec ision of each plane of the assembled module must be as good as 30 $\\mu$m along the precision coordi nate and 80 $\\mu$m perpendicular to the chamber. The design and construction procedure of the microm egas modules will be presented, as well as the design for the assembly of modules onto the New Small Wheel. Emphasis wi...

Losel, Philipp Jonathan; The ATLAS collaboration

2014-01-01T23:59:59.000Z

356

HEBT MOMENTUM SCRAPER, H+ RAY TRACE SIMULATION AND VACUUM CHAMBER DESIGN.  

SciTech Connect

In the 1MW Spallation Neutron Source (SNS), the High-Energy Beam Transfer line (HEBT) connects the LINAC to the accumulator ring. A major requirement of the SNS complex is to have low uncontrolled beam loss (lnA/m), to allow hands on maintenance. The vacuum requirement for the HEBT is 5x10{sup {minus}8} Torr. Excessive H{sup {minus}} stripping will occur above this pressure and increase losses in the machine. The HEBT is also equipped with three sets of beam halo scrapers, one for momentum and two for transverse collimation. The momentum scraper is located at a maximum dispersion point, between the 3rd dipole magnet (DD3) of HEBT and the 14th quadrupole (Q14) of the HEBT line. The momentum scraper uses movable foils that strip the H{sup {minus}} beam that has momentum spread (0.2%<{delta}p/p<0.6%) into H{sup +}, and the H{sup +} ions are then directed out of the HEBT beam line to a beam dump by the next bending magnet DD4 (4th dipole of HEBT). In order to ensure that the extracted H{sup +} beam travels inside the extraction chamber to minimize the radiation in the beam dump station region, we performed H{sup +} particle tracking to determine the outer boundaries and the angle of the Y-type vacuum chamber that will contain the H{sup +} beam. The development and design of the special HEBT momentum scraper extraction and exit chamber, and the relevant H{sup +} trajectories are presented in this paper.

HE,P.; HSEUH,H.C.; RAPARIA,D.; TSOUPAS,N.; WEISS,D.

2001-06-18T23:59:59.000Z

357

BSTBacterial Source Tracking Conference Proceedings  

E-Print Network (OSTI)

BSTBacterial Source Tracking Conference Proceedings 2012 Bacterial Source Tracking State Conference Conference Proceedings Prepared by: Lucas Gregory, Texas Water Resources Institute Courtney Smith of the Science Conference Texas Water Resources Institute TR-427 June 2012 #12;#12;Texas Water Resources

358

Computer program for the sensitivity calculation of a CR-39 detector in a diffusion chamber for radon measurements  

SciTech Connect

Computer software for calculation of the sensitivity of a CR-39 detector closed in a diffusion chamber to radon is described in this work. The software consists of two programs, both written in the standard Fortran 90 programming language. The physical background and a numerical example are given. Presented software is intended for numerous researches in radon measurement community. Previously published computer programs TRACK-TEST.F90 and TRACK-VISION.F90 [D. Nikezic and K. N. Yu, Comput. Phys. Commun. 174, 160 (2006); D. Nikezic and K. N. Yu, Comput. Phys. Commun. 178, 591 (2008)] are used here as subroutines to calculate the track parameters and to determine whether the track is visible or not, based on the incident angle, impact energy, etching conditions, gray level, and visibility criterion. The results obtained by the software, using five different V functions, were compared with the experimental data found in the literature. Application of two functions in this software reproduced experimental data very well, while other three gave lower sensitivity than experiment.

Nikezic, D., E-mail: nikezic@kg.ac.rs; Stajic, J. M. [Faculty of Science, University of Kragujevac, R. Domanovica 12, Kragujevac 34000 (Serbia)] [Faculty of Science, University of Kragujevac, R. Domanovica 12, Kragujevac 34000 (Serbia); Yu, K. N. [Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue (Hong Kong)] [Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue (Hong Kong)

2014-02-15T23:59:59.000Z

359

Visualization study of bubble behavior in a subcooled flow boiling channel under rolling motion  

Science Journals Connector (OSTI)

Abstract Boiling heat transfer equipment in a vessel can be affected by the additional force which is generated by the rolling, swing and heaving motion of the vessel. Bubble behavior is very important for the research of boiling phenomenon. Bubble behavior under rolling motion condition is experimentally studied by using a high speed camera. The experiment is conducted in a subcooled flow boiling rectangular channel, and the cross section size of the channel is 2mmנ40mm. Two types of bubbles with large discrepancies in sliding and condensation behaviors can be observed in the captured images. The first type bubbles disappear quickly after generation and the slide distance is only a few times of bubble maximum diameter, while the second type bubbles can survive a longer time after leaving the nucleation site and slide for a long distance with the flowing fluid. Bubble characteristics under rolling motion are separately studied for different type bubbles based on the above reasons. The results show that the lifetime, maximum diameter, nucleation frequency and sliding velocity of the first type bubble are periodically fluctuated and the period is same with the rolling motion. The fluctuation intensity of the bubble lifetime and maximum diameter can be enhanced by the increase of the rolling amplitude. The peak value of bubble lifetime, maximum diameter, and nucleation frequency appears when the rolling platform plate rolls to the maximum positive angle, while opposite trend can be observed in the variation of bubble sliding velocity. In view of the characteristics of the second type bubbles, lifetime and maximum diameter are not measured. And the variation of nucleation frequency and sliding velocity of the second type bubbles under the effect of rolling motion is same with the first type bubbles. Furthermore, the effects of additional force, variation of local pressure and flow rate oscillation on bubble behavior are analyzed. The results indicate that the fluctuations of the bubble parameters can be generated by the variation of local pressure caused by rolling motion even no influential flow rate fluctuation occurs. The effect of the acceleration variation vertical to the heated surface on bubble behavior is unclear and need more researches in the future work.

Shaodan Li; Sichao Tan; Chao Xu; Puzhen Gao

2015-01-01T23:59:59.000Z

360

A Key to Pulsar Wind Bubble Morphologies: HD simulations  

E-Print Network (OSTI)

We present a model of a pulsar-driven supernova remnant, by using a hydrodynamics code, which simulates the evolution of a pulsar wind nebula when the pulsar is moving at a high velocity through its expanding supernova remnant. The simulation shows four different stages of the pulsar wind nebula: the supersonic expansion stage, the reverse shock interaction stage, the subsonic expansion stage and ultimately the bow shock stage. Due to the high velocity of the pulsar, the position of the pulsar is located at the head of the pulsar wind bubble, after the passage of the reverse shock. The resulting morphology of the pulsar wind bubble is therefore similar to the morphology of a bow shock pulsar wind nebula. We show how to distinguish these two different stages, and apply this method to the SNR G327.1-1.1, for which we argue that there is no bow shock around its pulsar wind nebula.

Eric van der Swaluw; Turlough P. Downes

2003-10-15T23:59:59.000Z

Note: This page contains sample records for the topic "bubble chamber tracks" 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

Stability of bubble nuclei through Shell-Effects  

E-Print Network (OSTI)

We investigate the shell structure of bubble nuclei in simple phenomenological shell models and study their binding energy as a function of the radii and of the number of neutron and protons using Strutinsky's method. Shell effects come about, on the one hand, by the high degeneracy of levels with large angular momentum and, on the other, by the big energy gaps between states with a different number of radial nodes. Shell energies down to -40 MeV are shown to occur for certain magic nuclei. Estimates demonstrate that the calculated shell effects for certain magic numbers of constituents are probably large enough to produce stability against fission, alpha-, and beta-decay. No bubble solutions are found for mass number A < 450.

Klaus Dietrich; Krzysztof Pomorski

1997-04-25T23:59:59.000Z

362

ENGINEERING DEVELOPMENT OF SLURRY BUBBLE COLUMN REACTOR (SBCR) TECHNOLOGY  

SciTech Connect

The major technical objectives of this program are threefold: (1) to develop the design tools and a fundamental understanding of the fluid dynamics of a slurry bubble column reactor to maximize reactor productivity, (2) to develop the mathematical reactor design models and gain an understanding of the hydrodynamic fundamentals under industrially relevant process conditions, and (3) to develop an understanding of the hydrodynamics and their interaction with the chemistries occurring in the bubble column reactor. Successful completion of these objectives will permit more efficient usage of the reactor column and tighter design criteria, increase overall reactor efficiency, and ensure a design that leads to stable reactor behavior when scaling up to large-diameter reactors. Washington University's work during the reporting period involved the implementation of the automated calibration device, which will provide an advanced method of determining liquid and slurry velocities at high pressures. This new calibration device is intended to replace the original calibration setup, which depended on fishing lines and hooks to position the radioactive particle. The report submitted by Washington University contains a complete description of the new calibration device and its operation. Improvements to the calibration program are also discussed. Iowa State University utilized air-water bubble column simulations in an effort to determine the domain size needed to represent all of the flow scales in a gas-liquid column at a high superficial velocity. Ohio State's report summarizes conclusions drawn from the completion of gas injection phenomena studies, specifically with respect to the characteristics of bubbling-jetting at submerged single orifices in liquid-solid suspensions.

Bernard A. Toseland

2000-12-31T23:59:59.000Z

363

ccsd00000577 Threedimensional bubble clusters: shape, packing and  

E-Print Network (OSTI)

properties such as aging, due to gas dif­ fusion, and structure is a problem of fundamental interest­length) structure of equal­ size bubbles that fills space? In 2D, Hales [3] proved that this is the familiar=V 2=3 . #15; Growth laws: how does a foam age, or coarsen, due to gas diffusion across its surfaces

364

Negative mass bubbles in de Sitter space-time  

E-Print Network (OSTI)

We study the possibility of the existence of negative mass bubbles within a de Sitter space-time background with matter content corresponding to a perfect fluid. It is shown that there exist configurations of the perfect fluid, that everywhere satisfy the dominant energy condition, the Einstein equations and the equations of hydrostatic equilibrium, however asymptotically approach the exact solution of Schwarzschid-de Sitter space-time with a negative mass.

Mbarek, Saoussen

2014-01-01T23:59:59.000Z

365

Negative mass bubbles in de Sitter space-time  

E-Print Network (OSTI)

We study the possibility of the existence of negative mass bubbles within a de Sitter space-time background with matter content corresponding to a perfect fluid. It is shown that there exist configurations of the perfect fluid, that everywhere satisfy the dominant energy condition, the Einstein equations and the equations of hydrostatic equilibrium, however asymptotically approach the exact solution of Schwarzschid-de Sitter space-time with a negative mass.

Saoussen Mbarek; M. B. Paranjape

2014-07-06T23:59:59.000Z

366

Turbine component cooling channel mesh with intersection chambers  

DOE Patents (OSTI)

A mesh (35) of cooling channels (35A, 35B) with an array of cooling channel intersections (42) in a wall (21, 22) of a turbine component. A mixing chamber (42A-C) at each intersection is wider (W1, W2)) than a width (W) of each of the cooling channels connected to the mixing chamber. The mixing chamber promotes swirl, and slows the coolant for more efficient and uniform cooling. A series of cooling meshes (M1, M2) may be separated by mixing manifolds (44), which may have film cooling holes (46) and/or coolant refresher holes (48).

Lee, Ching-Pang; Marra, John J

2014-05-06T23:59:59.000Z

367

Bubble study could improve industrial splash control | Argonne National  

NLE Websites -- All DOE Office Websites (Extended Search)

The evolution process during drop impact: inertial retraction of an air film, contraction of the top air surface into a toroidbubble, and pinch-off of a daughter droplet in the bubble. The solid-line arrows denote the propagation of capillary waves, and the dashed-line arrow indicates the contact between the crest and the substrate. To view a larger version of the image, click on it. The evolution process during drop impact: inertial retraction of an air film, contraction of the top air surface into a toroidbubble, and pinch-off of a daughter droplet in the bubble. The solid-line arrows denote the propagation of capillary waves, and the dashed-line arrow indicates the contact between the crest and the substrate. To view a larger version of the image, click on it. The evolution process during drop impact: inertial retraction of an air film, contraction of the top air surface into a toroidbubble, and pinch-off of a daughter droplet in the bubble. The solid-line arrows denote the propagation of capillary waves, and the dashed-line arrow indicates the contact between the crest and the substrate. To view a larger version of the image, click on it.

368

Azimuthal Asymmetries and Vibrational Modes in Bubble Pinch-off  

E-Print Network (OSTI)

The pressure-driven inertial collapse of a cylindrical void in an inviscid liquid is an integrable, Hamiltonian system that forms a finite-time singularity as the radius of the void collapses to zero. Here it is shown that when the natural cylindrical symmetry of the void is perturbed azimuthally, the perturbation modes neither grow nor decay, but instead cause constant amplitude vibrations about the leading-order symmetric collapse. Though the amplitudes are frozen in time, they grow relative to the mean radius which is collapsing to zero, eventually overtaking the leading-order symmetric implosion. Including weak viscous dissipation destroys the integrability of the underlying symmetric implosion, and the effect on the stability spectrum is that short-wavelength disturbances are now erased as the implosion proceeds. Introducing a weak rotational flow component to the symmetric implosion dynamics causes the vibrating shapes to spin as the mean radius collapses. The above theoretical scenario is compared to a closely related experimental realization of void implosion: the disconnection of an air bubble from an underwater nozzle. There, the thin neck connecting the bubble to the nozzle implodes primarily radially inward and disconnects. Recent experiments were able to induce vibrations of the neck shape by releasing the bubble from a slot-shaped nozzle. The frequency and amplitude of the observed vibrations are consistent with the theoretical prediction once surface tension effects are taken into account.

Laura E. Schmidt

2011-12-19T23:59:59.000Z

369

Large Scale Tracked Vehicle Concurrent Engineering Environment  

Science Journals Connector (OSTI)

In this paper, a fully integrated Tracked Vehicle Concurrent Engineering environment that exploits CAD and CAE technologies in ... vehicles is presented. The Tracked Vehicle Concurrent Engineering environment com...

Kyung K. Choi; J. Kirk Wu; Kuang-Hua Chang; Jun Tang

1995-01-01T23:59:59.000Z

370

Cooperative Modeling and Design History Tracking Using Design Tracking Matrix  

E-Print Network (OSTI)

This thesis suggests a new framework for cooperative modeling which supports concurrency design protocol with a design history tracking function. The proposed framework allows designers to work together while eliminating design conflicts...

Kim, Jonghyun

2010-10-12T23:59:59.000Z

371

Global existence for a translating near-circular Hele-Shaw bubble with surface tension  

E-Print Network (OSTI)

This paper is concerned with proving global existence and stability of a translating bubble in a Hele-Shaw cell that is small relative to cell width. When the ratio of cell width to bubble dimension is sufficient large, the equations admit the steady translating near-circular bubble shape. We are concerned with global existence with the initial condition close to this steady shape. When the cell side walls effects are negligible, we show that the translating circular bubble is asymptotically stable for nonzero surface tension. With side walls effects, we obtain similar results for bubble shapes symmetric about the channel centerline. As with our prior work, we exploit a boundary integral approach that allows for a finite nonzero viscosity ratio between fluid inside and outside the bubble.

Ye, J

2009-01-01T23:59:59.000Z

372

QN_CloudChamberV1.4  

NLE Websites -- All DOE Office Websites (Extended Search)

How to Build a Cosmic-Ray Cloud Chamber How to Build a Cosmic-Ray Cloud Chamber October 2008, Version 1.4 * QuarkNet version. Fermi National Accelerator Laboratory. * Instructions written by Jeremy Paschke, York High School and Anne Mary Teichert, Fermilab. * Model initially designed and built by Robert Peterson, Fermilab. If you have further questions, or improvements of your own you would like to share with the QuarkNet group, please contact: Jeremy Paschke, York High School Physics Instructor (jpaschke@elmhurst205.org), or Bob Peterson, Fermilab Education Specialist, (rspete@fnal.gov). Justification: Showing your class a working cloud chamber is one of the best ways to generate student interest in modern physics. The cloud chamber described below will display natural background radiation (muons generated by

373

Mini-chamber, an advanced protection concept for NIF  

SciTech Connect

Inertial confinement fusion (ICF) target debris and ablated near-target materials pose the primary threat to the National Ignition Facility (NIF) final optics debris shields, as well as a major challenge in future inertial fusion energy (IFE) power plants. This work discusses a NIF `mini-chamber,` designed to mitigate the debris threat. Although the NIF base-line design protects against debris using a frost-protected target positioner and refractory first-wall coatings, the mini-chamber provides important flexibility in three areas: debris-shield protection from beyond-design basis shots (i.e. heavy hohlraums, special diagnostics, shields); fielding of large experiments with significant surface ablation; and studying key ablation and gas-dynamics issues for liquid-wall IFE power plants. Key mini-chamber modeling results are presented, followed by discussion of equipment requirements for fielding a NIF mini-chamber. 7 refs., 3 figs.

Peterson, P.F.; Scott, J.M. [Univ. of California, Berkeley, CA (United States)

1996-12-31T23:59:59.000Z

374

Velocity of the electric arc in a plasmatron discharge chamber  

Science Journals Connector (OSTI)

An experimental investigation of the velocity of a high-current arc with air injection in the discharge chamber of a coaxial sectioned plasmatron is described. The experiments showed that the velocity of the c...

A. S. Shaboltas

1969-09-01T23:59:59.000Z

375

Carrying Semiautomatic Pistols with a Round in the Chamber  

Directives, Delegations, and Requirements

Sets forth requirements for a DOE security police officer who must carry a round in the chamber of a semiautomatic pistol while on duty. Does not cancel other directives.

1999-10-28T23:59:59.000Z

376

E-Cloud Build-up in Grooved Chambers  

E-Print Network (OSTI)

and F. Zimmermann, LC e-Cloud Activities at CERN, talkal. , Simulations of the Electron Cloud for Vari- ous Con?E-CLOUD BUILD-UP IN GROOVED CHAMBERS ? M. Venturini LBNL,

Venturini, Marco

2007-01-01T23:59:59.000Z

377

E-Print Network 3.0 - atmospheric exposure chambers Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

Topic List Advanced Search Sample search results for: atmospheric exposure chambers Page: << < 1 2 3 4 5 > >> 1 Dynamic Chamber System to Measure Gaseous Compounds Emissions...

378

Transverse wakefields due to asymmetric protrusions into a vacuum chamber  

Science Journals Connector (OSTI)

Abstract We analyze the effect of a wakefield caused by an asymmetric protrusion inside the accelerator vacuum chamber. The asymmetry leads to a transverse kick on the beam and an increase of the projected transverse beam emittance. Calculations are done for a model rectangular protrusion in a vacuum chamber of rectangular cross-section. Based on our analysis, numerical estimates are given for the SuperKEKB accelerator in KEK, Japan, and TLEP-W proposal at CERN.

Gennady Stupakov; Demin Zhou

2014-01-01T23:59:59.000Z

379

Combined effect of viscosity and vorticity on single mode Rayleigh-Taylor instability bubble growth  

SciTech Connect

The combined effect of viscosity and vorticity on the growth rate of the bubble associated with single mode Rayleigh-Taylor instability is investigated. It is shown that the effect of viscosity on the motion of the lighter fluid associated with vorticity accumulated inside the bubble due to mass ablation may be such as to reduce the net viscous drag on the bubble exerted by the upper heavier fluid as the former rises through it.

Banerjee, Rahul; Mandal, Labakanta; Roy, S.; Khan, M.; Gupta, M. R. [Department of Instrumentation Science and Centre for Plasma Studies, Jadavpur University, Kolkata 700032 (India)

2011-02-15T23:59:59.000Z

380

Transport of entrained air bubbles in fresh concrete due to pressure variations  

E-Print Network (OSTI)

is beneficial. Bubbles are stabilized against mechanical deformation and rupture by means of the so called "Marangoni" effect due to the adsorbed films and the consequent lowering of surface tension. "This effect is to restore a locally deformed bubble... . . . . . . . . . . . . . . . , . . . . . . , . . . . . . . 185 LIST OF TABLES Table 1. Page Air Pressure in Bubbles Due to Surface Tension Only [9]. . . . . . . . . , . . . . . . . . . . . . . . . 66 Table 2. Estimation of Air Loss by Dissolution. Table 3. Design Factorial Test Conditions. 83 Table 4...

Macha, Ravi Kumar

2012-06-07T23:59:59.000Z

Note: This page contains sample records for the topic "bubble chamber tracks" 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

SUMMARY ON TITANIUM NITRIDE COATING OF SNS RING VACUUM CHAMBERS.  

SciTech Connect

The inner surfaces of the 248 m Spallation Neutron Source (SNS) accumulator ring vacuum chambers are coated with {approx}100nm of titanium nitride (TiN) to reduce the secondary electron yield (SEY) of the chamber walls. There are approximately 135 chambers and kicker modules, some up to 5m in length and 36cm in diameter, coated with TiN. The coating is deposited by means of reactive DC magnetron sputtering -using a - cylindrical cathode with internal permanent magnets. This cathode configuration generates a deposition-rate sufficient to meet the required production schedule and produces stoichiometric films with good adhesion, low SEY and acceptable outgassing. Moreover, the cathode magnet configuration allows for simple changes in length and has been adapted to coat the wide variety of chambers and components contained within the arcs, injection, extraction, collimation and RF straight sections. Chamber types and quantities as well as the cathode configurations are presented herein. The unique coating requirements of the injection kicker ceramic chambers and the extraction kicker ferrite surface will be emphasized. A brief summary of the salient coating properties is given including the interdependence of SEY as a function of surface roughness and its effect on outgassing.

TODD, R.; HE, P.; HSEUH, H.C.; WEISS, D.

2005-05-16T23:59:59.000Z

382

Automatic Library Tracking Database Infrastructure  

NLE Websites -- All DOE Office Websites (Extended Search)

Libraries » ALTD Libraries » ALTD ALTD Automatic Library Tracking Database Infrastructure To track and monitor library usage and better serve your software needs, we have enabled the Automatic Library Tracking Database (ALTD) on our prodcution systems, Hopper and Edison. ALTD is also availailable on Carver, but has not enabled for all users by default yet. ALTD, developed by National Institute for Computational Sciences, automatically and transparently tracks all libraries linked into an application at compile time, as well as the libraries used at run time, by intercepting the linker (ld) and the job launcher (aprun, or mpirun). It is a light-weight tool, and should not change your experience with compilation and execution of codes on the machine. However, if you encounter any problems due to ALTD,

383

Radiological Source Registry and Tracking  

NLE Websites -- All DOE Office Websites (Extended Search)

Radiological Source Registry and Tracking (RSRT) Radiological Source Registry and Tracking (RSRT) Home HSS Logo Radiological Source Registry and Tracking (RSRT) Department of Energy (DOE) Notice N 234.1 Reporting of Radioactive Sealed Sources has been superseded by DOE Order O 231.1B Environment, Safety and Health Reporting. O 231.1B identifies the requirements for centralized inventory and transaction reporting for radioactive sealed sources. Each DOE site/facility operator that owns, possesses, uses or maintains in custody those accountable radioactive sealed sources identified in Title 10 Code of Federal Regulation Part 835, Occupational Radiation Protection (10 CFR 835), Appendix E, and International Atomic Energy Agency (IAEA) Categories 1 and 2 radioactive sealed sources identified in Attachment 5, Appendix A of O 321.1B, will submit information to the DOE Radiological Source Registry and Tracking (RSRT) System.

384

Bubbles Help Break Energy Storage Record for Lithium Air-Batteries  

NLE Websites -- All DOE Office Websites (Extended Search)

Bubbles Help Break Energy Storage Record for Lithium Air-Batteries Foam-base graphene keeps oxygen flowing in batteries that holds promise for electric vehicles January...

385

E-Print Network 3.0 - air bubbles mimic Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

bubble. Adv Colloid Interfac 39:397-416. 8... (received for review January 14, 2010) The interaction between moving ... Source: Chan, Derek Y C - Department of Mathematics and...

386

Bubble-Point Measurements of Eight Binary Mixtures for Organic Rankine Cycle Applications  

Science Journals Connector (OSTI)

Bubble-Point Measurements of Eight Binary Mixtures for Organic Rankine Cycle Applications ... These mixtures are of interest as working fluids in organic Rankine power cycles. ...

Stephanie L. Outcalt; Eric W. Lemmon

2013-05-24T23:59:59.000Z

387

E-Print Network 3.0 - air bubble entrainment Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

30 June 4, 2010 Summary: . Finally, bubble entrainment and interaction with traveling vortex tube under dilute loadings are simulated... some conditions, the entrainment of eight...

388

E-Print Network 3.0 - anisotropic bubble nucleation Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

Engineering 11 Colloids and Surfaces A: Physicochem. Eng. Aspects 263 (2005) 336340 Phenomenology of bubble nucleation in the solid-state Summary: December 2004 Available online 3...

389

Quantification of line tracking solutions for automotive applications  

Science Journals Connector (OSTI)

Unlike line tracking in automotive painting applications, line tracking for automotive general assembly applications requires position tracking in order to perform assembly operations to a required assembly tolerance. Line tracking quantification experiments ... Keywords: position tracking performance

Jane Shi; Rick F. Rourke; Dave Groll; Peter W. Tavora

2008-08-01T23:59:59.000Z

390

Analysis of energies of stationary bubbles at liquid pool surfaces and the subsequent droplet release due to bubble burst based on RESUS code calculations  

SciTech Connect

In case of a hypothetical nuclear reactor accident involving a failure of the primary system, a liquid coolant pool may frequently be formed, which may be contaminated by suspended or solved fuel particles and fission products. For many accident sequences, in which gas is injected into the liquid domain or bubbles are generated by means of heating, pressure transients or chemical reactions, the release of low volatile species from liquid surfaces into a gas atmosphere due to bubble burst is identified as a decisive release mechanism. Generally, resuspension of radioactive species is caused by droplets ejected from the pool surface into the atmosphere, either dominated by direct momentum exchange mechanisms between gas flow and liquid for high gas fluxes or by bursting of single bubbles in case of low gas fluxes. In the latter case, the release of droplets containing radionuclides is governed by two mechanisms, namely micro-droplet generation due to bubble film cap collapse and formation and subsequent disintegration of liquid jets producing so-called jet droplets. Jet and jet droplet formation is modeled in the code system RESUS.MOD2 which contains models for the growth of the bubble in the pool, its shape while resting at the liquid surface, and jet and jet-droplet generation after bubble cap rupture. Using the module BUBSHAPE (BUBbleSHAPE) of the RESUS code, the characteristic profile of a bubble resting at the liquid surface as well as the mechanical energies available for droplet formation and consequently droplet- and particle release can be determined. The governing resuspension energies are identified to be the surface energy, the energy stored in the gas within the bubble due to its excess pressure, and the potential energy due to the displacement of liquid.

Starflinger, J.; Koch, M.K.; Brockmeier, U.; Unger, H. [Ruhr Univ., Bochum (Germany). Dept. for Nuclear and New Energy Systems; Schuetz, W. [Inst. for Reactor Safety, Karlsruhe (Germany)

1996-08-01T23:59:59.000Z

391

Track 4: Employee Health and Wellness  

Energy.gov (U.S. Department of Energy (DOE))

ISM Workshop Presentations Knoxville Convention Center, Knoxville, TN August 2009 Track 4: Employee Health and Wellness

392

Numerical Simulations of Bubble Dynamics and Heat Transfer in Pool Boiling--Including the Effects of Conjugate Conduction, Level of Gravity, and Noncondensable Gas Dissolved in the Liquid  

E-Print Network (OSTI)

Rohsenow, W. M. (1969). Bubble growth rates in non-uniformW. M. , & Griffith, P. (1970). On bubble growth rates. and Ju, Y.S. , Single bubble dynamics on a superhydrophilic

Aktinol, Eduardo

2014-01-01T23:59:59.000Z

393

The effect of helium nano-bubbles on the structures stability and electronic properties of palladium tritides: a density functional theory study  

Science Journals Connector (OSTI)

...effect of helium nano-bubbles on the structures stability and electronic properties...found to contain helium gas bubbles. The stability of metal tritides decreases...The effects of helium bubbles on metal tritides are clearly...

2014-01-01T23:59:59.000Z

394

Tracking the Invisible:Tracking the Invisible: Learning Where the Object Might be  

E-Print Network (OSTI)

Tracking the Invisible:Tracking the Invisible: Learning Where the Object Might be Helmut Grabner1 the Invisible - ETH-Zurich, Computer Vision Lab #12;Tracking CarlTracking Carl San Francisco, 2010/06/16 3H. Grabner, Tracking the Invisible - ETH-Zurich, Computer Vision Lab #12;Goal: Estimate the Position

Grabner, Helmut

395

Initial Back-to-Back Fission Chamber Testing in ATRC  

SciTech Connect

Development and testing of in-pile, real-time neutron sensors for use in Materials Test Reactor experiments is an ongoing project at Idaho National Laboratory. The Advanced Test Reactor National Scientific User Facility has sponsored a series of projects to evaluate neutron detector options in the Advanced Test Reactor Critical Facility (ATRC). Special hardware was designed and fabricated to enable testing of the detectors in the ATRC. Initial testing of Self-Powered Neutron Detectors and miniature fission chambers produced promising results. Follow-on testing required more experiment hardware to be developed. The follow-on testing used a Back-to-Back fission chamber with the intent to provide calibration data, and a means of measuring spectral indices. As indicated within this document, this is the first time in decades that BTB fission chambers have been used in INL facilities. Results from these fission chamber measurements provide a baseline reference for future measurements with Back-to-Back fission chambers.

Benjamin Chase; Troy Unruh; Joy Rempe

2014-06-01T23:59:59.000Z

396

Part I -Mechanics M09M.1 -Bubble in an Incompressible Fluid (J07M.3, J94M.1) M09M.1 -Bubble in an Incompressible Fluid (J07M.3, J94M.1)  

E-Print Network (OSTI)

Part I - Mechanics M09M.1 - Bubble in an Incompressible Fluid (J07M.3, J94M.1) M09M.1 - Bubble in an Incompressible Fluid (J07M.3, J94M.1) Problem An ideal incompressible fluid of density contains a bubble of radius R(t). The fluid pressure is held constant at P. Take the bubble to be empty (no pressure within

Petta, Jason

397

Feature Tracking Using Reeb Graphs  

SciTech Connect

Tracking features and exploring their temporal dynamics can aid scientists in identifying interesting time intervals in a simulation and serve as basis for performing quantitative analyses of temporal phenomena. In this paper, we develop a novel approach for tracking subsets of isosurfaces, such as burning regions in simulated flames, which are defined as areas of high fuel consumption on a temperature isosurface. Tracking such regions as they merge and split over time can provide important insights into the impact of turbulence on the combustion process. However, the convoluted nature of the temperature isosurface and its rapid movement make this analysis particularly challenging. Our approach tracks burning regions by extracting a temperature isovolume from the four-dimensional space-time temperature field. It then obtains isosurfaces for the original simulation time steps and labels individual connected 'burning' regions based on the local fuel consumption value. Based on this information, a boundary surface between burning and non-burning regions is constructed. The Reeb graph of this boundary surface is the tracking graph for burning regions.

Weber, Gunther H.; Bremer, Peer-Timo; Day, Marcus S.; Bell, John B.; Pascucci, Valerio

2010-08-02T23:59:59.000Z

398

Simultaneous measurement of bubble size, velocity and void fraction in two-phase bubbly flows with time-resolved X-ray imaging  

Science Journals Connector (OSTI)

Key parameters of two-phase flows, such as void fraction and microscale bubble size, shape and velocity, were simultaneously measured using time-resolved X-ray imaging.

Jung, S.Y.

2014-01-30T23:59:59.000Z

399

Research of Real Estate Bubble Measurements Based on Ramsey Model A Case Study of Nanning in China  

Science Journals Connector (OSTI)

Real estate bubble has become one of the serious problems that influence the economy sustainable development in our country. This paper employs Ramsey model to make measurement analysis on real estate bubbles in ...

Xiekui Zhang; Defu Wu

2011-01-01T23:59:59.000Z

400

On the stability of a self-similar spherical bubble of a scalar Higgs field in de Sitter space  

Science Journals Connector (OSTI)

An exact generalized discontinuous solution of the spherical-bubble type is obtained for a scalar Higgs ... shown that the radius of such a generalized bubble evolves in accordance with one of the ... to a dynami...

N. A. Voronov; L. Dyshko; N. B. Konyukhova

2005-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "bubble chamber tracks" 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

Analytic theory for the determination of velocity and stability of bubbles in a Hele-Shaw cell  

Science Journals Connector (OSTI)

An asymptotic theory is presented for the determination of velocity and linear stability of a steady symmetric bubble in a Hele-Shaw cell for small ... surface tension. In the first part, the bubble velocity U re...

S. Tanveer

1989-05-01T23:59:59.000Z

402

Evaluation of stability and size distribution of sunflower oil-coated micro bubbles for localized drug delivery  

Science Journals Connector (OSTI)

A T-junction micro fluidic device constructed using 3D prototyping was made for the production of mono dispersed micro bubbles. These micro bubbles use sunflower oil as a lipid layer. Stability studies for micro

WalterDuartedeAraujo Filho; Fbio Kurt Schneider

2012-09-01T23:59:59.000Z

403

Analytic theory for the determination of velocity and stability of bubbles in a Hele-Shaw cell  

Science Journals Connector (OSTI)

Here, we extend the analysis of Part I to determine the linear stability of a bubble in a Hele-Shaw cell analytically. Only ... the solution branch corresponding to the largest possible bubble velocity U for give...

S. Tanveer

1989-05-01T23:59:59.000Z

404

Rapid measurement of minimum miscibility pressure with the rising-bubble apparatus  

SciTech Connect

The minimum miscibility pressure (MMP) for a gas/oil pair can be measured within 1 hour with the rising-bubble apparatus (RBA). Development of miscibility between a gas bubble and an oil can be observed visually. The measurements of the MMP with the RBA compare favorably with those based on slim-tube experiments and predictions from phase-behavior studies.

Christiansen, R.L.; Haines, H.K.

1987-11-01T23:59:59.000Z

405

Water-Splitting Photoelectrolysis Reaction Rate via Microscopic Imaging of Evolved Oxygen Bubbles  

E-Print Network (OSTI)

to directly split water in a semiconductor photoelectrochemical cell is a promising source of carbon-free fuel Institute of Technology, Pasadena, California 91125, USA Bubble formation and growth on a water of the gas-evolving reaction rate. Optical microscopy was used to record the bubble growth on single

Atwater, Harry

406

Electrokinetic displacement of air bubbles in microchannels Pavlo Takhistov, Alexandra Indeikina, and Hsueh-Chia Chang  

E-Print Network (OSTI)

and further reduces film flow. Within a large window in the total ionic concentration Ct , these mechanisms a higher relative film conductivity. The bubble velocity within the above concentration window is captured is shown to be possible when the film flow around the bubble is less than the bulk flow behind it. In our

Chang, Hsueh-Chia

407

GLOBAL EXISTENCE FOR A TRANSLATING NEAR-CIRCULAR HELE-SHAW BUBBLE WITH SURFACE TENSION  

E-Print Network (OSTI)

GLOBAL EXISTENCE FOR A TRANSLATING NEAR-CIRCULAR HELE-SHAW BUBBLE WITH SURFACE TENSION J. YE1 AND S for any nonzero surface tension despite the fact that a local planar approximation near the front problem, Dissipative equations, Hele-Shaw prob- lem, Translating bubbles, Surface tension Mathematics

Tanveer, Saleh

408

Extreme organic carbon burial fuels intense methane bubbling in a temperate reservoir  

E-Print Network (OSTI)

Extreme organic carbon burial fuels intense methane bubbling in a temperate reservoir Sebastian. Wehrli (2012), Extreme organic carbon burial fuels intense methane bubbling in a temperate reservoir; revised 25 November 2011; accepted 30 November 2011; published 4 January 2012. [1] Organic carbon (OC

Wehrli, Bernhard

409

Gas Exchange and Bubble-Induced Supersaturation in a Wind-Wave Tank  

Science Journals Connector (OSTI)

Gas exchange and bubble-induced supersaturation were measured in a wind-wave tank using total gas saturation meters. The water in the tank was subjected to bubbling using a large number of frits at a depth of 0.6 m.

Peter Bowyer; David Woolf

2004-12-01T23:59:59.000Z

410

Ultrasonic bubble point sensor for petroleum fluids in remote and hostile environments  

Science Journals Connector (OSTI)

The bubble point is one of the most important physical properties of petroleum fluids. Present practice requires the shipment of samples to laboratories, a time-consuming process that compromises sample integrity. We have devised a method by which the bubble point can be estimated rapidly in a 5 mm diameter flow line immediately after a sample has been withdrawn from a subsurface rock formation. To measure the bubble point, the sample is isolated and depressurized. Measurement efficiency requires rapid depressurization, which often causes fluids to supersaturate. However, this problem can be mitigated by cavitation. We have found that it is possible to cavitate fluids at pressures of several megapascals, as long as the fluid is near its bubble point pressure. An ultrasonic transducer is used to simultaneously nucleate and detect bubbles at or near the thermodynamic bubble point. The cavitated bubbles produce fluctuations in the acoustic properties of the fluid that are detected in the near field or resonated volume of a transducer by measuring the fluctuations of the transducer's electrical properties. The variance of electrical properties increases by orders of magnitude in the presence of bubbles. The method has been demonstrated to work over a wide range of temperatures, pressures and fluids.

N W Bostrom; D D Griffin; R L Kleinberg; K K Liang

2005-01-01T23:59:59.000Z

411

Can 2HDM support fermion-stabilized bubbles of false vacuum?  

E-Print Network (OSTI)

The Higgs potential of the two-Higgs-doublet model can have several minima with different properties. We discuss a possibility that a heavy fermion, if trapped in a microscopic false vacuum bubble, might become light enough to prevent the bubble from the collapse.

I. P. Ivanov

2007-06-28T23:59:59.000Z

412

Global Existence and Stability of translating bubbles in a Hele-Shaw cell  

E-Print Network (OSTI)

surface tension, inwards normal, interface speed, viscosity ratio and steady bubble speed #12;BoundaryGlobal Existence and Stability of translating bubbles in a Hele-Shaw cell Saleh Tanveer (Ohio State for arbitrary initial conditions in displacement of more viscous fluid. Stability of steady states and global

Tanveer, Saleh

413

Geometry and Stability of Bubbles with Gravity MIYUKI KOISO & BENNETT PALMER  

E-Print Network (OSTI)

as geometric mod- els for bubbles; they minimize the surface tension of a homogeneous membrane, subjectGeometry and Stability of Bubbles with Gravity MIYUKI KOISO & BENNETT PALMER ABSTRACT. We study conditions for the stability of PMC surfaces with planar boundaries. A height estimate is obtained for stable

Palmer, Bennett

414

Time correlated single photon Mie scattering from a sonoluminescing bubble K. R. Weninger,1  

E-Print Network (OSTI)

to measure experimentally 5­8 . CW light scat- tering methods have been effective in measuring the dynami of detection PMTs to measure this bubble motion, but was limited by the 2 GHz sampling speed of the digitizer to measure bubble col- lapse near the time of light emission. The resolution limita- tions of light

Evans, Paul G.

415

8/12/08 9:38 AMLife in a bubble ( CAMBRIDGE Mass. --Hundreds of insec...) Page 1 of 2http://www.bio-medicine.org/biology-news-1/Life-in-a-bubble-4270-1/  

E-Print Network (OSTI)

8/12/08 9:38 AMLife in a bubble ( CAMBRIDGE Mass. -- Hundreds of insec...) Page 1 of 2http://www.bio-medicine.org/biology-news-1/Life-in-a-bubble-4270-1/ Navigation Links Biology News Medicine News Biology Products Medicine Medicine Dictionary Biology Navigation Medical Navigation M life bubble Post Your Comments: (View All

Flynn, Morris R.

416

Synergism between creep ductility and grain boundary bubbles  

Science Journals Connector (OSTI)

The marked decrease in creep ductility that can be caused by internal pressure in grain boundary pores is modelled to treat the interaction between boundary diffusion, power law creep, and bubble pressure. The application to 2.25 Cr?1 Mo steel in high pressure hydrogen is treated numerically using a computer program since here the internal methane pressure in pores is known, and kinetic data exists. Reasonable agreement is obtained between the predictions and the observed loss in ductility in the presence of 21 \\{MPa\\} of hydrogen. With methane pressurized bubbles, the model suggests intergranular fracture is powerlaw creep limited at essentially all temperatures and stresses. Thus one predicts the hydrogen attack resistance in service to be strongly influenced by the creep strength of the alloy. In the absence of hydrogen (methane), intergranular fracture should be limited by diffusion creep and thus much more sensitive to pore density and boundary diffusion rate than strength. Possible application to recent high temperature steamline failures in welded pipe and to helium effects in nuclear reactor materials are also indicated.

P. Shewmon

1987-01-01T23:59:59.000Z

417

Validation of Interface Capturing and Tracking techniques with different surface tension treatments against a Taylor bubble benchmark  

E-Print Network (OSTI)

, micro-process engineering, catalysis (coated monolith reactors), material synthesis, analysis of biologi of Smart Interfaces, Mathematical Modeling and Analysis, Technische Universit�t Darmstadt, Germany b its use by assessing and approving the reliability and accuracy of the solvers used by several

Noelle, Sebastian

418

Federation of Indian Chambers of Commerce & Industry (FICCI) | Department  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Federation of Indian Chambers of Commerce & Industry (FICCI) Federation of Indian Chambers of Commerce & Industry (FICCI) Federation of Indian Chambers of Commerce & Industry (FICCI) March 20, 2007 - 11:37am Addthis Thank you Geoff (Pyatt) for that introduction. I'd like to thank FICCI for hosting this event and thank its leadership for their kind words. I'm very pleased to be here in India - and to be with all of you today. Since his very first days in office, President Bush has considered growing and strengthening the United States' bilateral relationship with India to be a top priority. The shared commitment of President Bush and Prime Minister Singh to building our relationship was evidenced by the historic strategic partnership initiatives announced during the President's visit here in March of last year.

419

Challenge Met as APS Sends Final Chambers to LCLS  

NLE Websites -- All DOE Office Websites (Extended Search)

A Marriage of Hardware and Hard Work A Marriage of Hardware and Hard Work Shaken but Not Stirred 2008 Rosalind Franklin Young Investigator Award The 2008 3-Way Meeting In R&D, Super X-rays Mark Many Spots APS News Archives: 2012 | 2011 | 2010 | 2009 2008 | 2007 | 2006 | 2005 2004 | 2003 | 2002 | 2001 2000 Subscribe to APS News rss feed Challenge Met as APS Sends Final Chambers to LCLS MAY 21, 2008 Bookmark and Share The final five (of 40) extruded aluminum vacuum chambers for the Linac Coherent Light Source (LCLS) undulator system have been shipped from Argonne National Laboratory - where the chambers were designed and assembled - to the Stanford Linear Accelerator Center, where the LCLS "will be the world's first x-ray free electron laser when it becomes operational in 2009. Pulses of x-ray laser light from LCLS will be many

420

Single-molecule mobility in confined and crowded femtoliter chambers  

SciTech Connect

The effects of increased crowding and confinement on the mobility of individual fluorescent molecules were studied using Fluorescence Correlation Spectroscopy (FCS) in a microfluidic device with sealable femtoliter-volume chambers, and compared to three dimensional stochastic Monte Carlo simulations. When crowding and the degree of confinement were increased simultaneously, extended correlation times of fluorescent intensity fluctuations were observed with FCS compared to varying either crowding or confinement alone. Both experimental data and simulation suggest these extended correlation times were due to increased fluorophore adsorption-desorption events at the chamber lid in the presence of crowders. The data in increasingly confined and crowded chambers described here captures some of the salient features of crowding in cell-like environments.

Collier, Pat [ORNL; Fowlkes, Jason Davidson [ORNL

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "bubble chamber tracks" 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

Ionisation Chambers for the LHC Beam Loss Detection  

E-Print Network (OSTI)

At the Large Hadron Collider (LHC) a beam loss system will be used to prevent and protect superconducting magnets against coil quenches and coil damages. Since the stored particle beam intensity is 8 orders of magnitude larger than the lowest quench level value particular attention is paid to the design of the secondary particle shower detectors. The foreseen ionisation chambers are optimised in geometry simulating the probable loss distribution along the magnets and convoluting the loss distribution with the secondary particle shower distributions. To reach the appropriate coverage of a particle loss and to determine the quench levels with a relative accuracy of 2 the number of the detectors and their lengths is weighted against the particle intensity density variation. In addition attention is paid to the electrical ionisation chamber signal to minimise the ion tail extension. This optimisation is based on time resolved test measurements in the PS booster. A proposal for a new ionisation chamber will be pre...

Gschwendtner, E; Dehning, B; Ferioli, G; Kain, V

2003-01-01T23:59:59.000Z

422

The Majorana Parts Tracking Database  

E-Print Network (OSTI)

The Majorana Demonstrator is an ultra-low background physics experiment searching for the neutrinoless double beta decay of $^{76}$Ge. The Majorana Parts Tracking Database is used to record the history of components used in the construction of the Demonstrator. The tracking implementation takes a novel approach based on the schema-free database technology CouchDB. Transportation, storage, and processes undergone by parts such as machining or cleaning are linked to part records. Tracking parts provides a great logistics benefit and an important quality assurance reference during construction. In addition, the location history of parts provides an estimate of their exposure to cosmic radiation. A web application for data entry and a radiation exposure calculator have been developed as tools for achieving the extreme radio-purity required for this rare decay search.

Abgrall, N; Avignone, F T; Bertrand, F E; Brudanin, V; Busch, M; Byram, D; Caldwell, A S; Chan, Y-D; Christofferson, C D; Combs, D C; Cuesta, C; Detwiler, J A; Doe, P J; Efremenko, Yu; Egorov, V; Ejiri, H; Elliott, S R; Esterline, J; Fast, J E; Finnerty, P; Fraenkle, F M; Galindo-Uribarri, A; Giovanetti, G K; Goett, J; Green, M P; Gruszko, J; Guiseppe, V E; Gusev, K; Hallin, A L; Hazama, R; Hegai, A; Henning, R; Hoppe, E W; Howard, S; Howe, M A; Keeter, K J; Kidd, M F; Kochetov, O; Kouzes, R T; LaFerriere, B D; Leon, J Diaz; Leviner, L E; Loach, J C; MacMullin, J; Martin, R D; Meijer, S J; Mertens, S; Miller, M L; Mizouni, L; Nomachi, M; Orrell, J L; O'Shaughnessy, C; Overman, N R; Petersburg, R; Phillips, D G; Poon, A W P; Pushkin, K; Radford, D C; Rager, J; Rielage, K; Robertson, R G H; Romero-Romero, E; Ronquest, M C; Shanks, B; Shima, T; Shirchenko, M; Snavely, K J; Snyder, N; Soin, A; Suriano, A M; Tedeschi, D; Thompson, J; Timkin, V; Tornow, W; Trimble, J E; Varner, R L; Vasilyev, S; Vetter, K; Vorren, K; White, B R; Wilkerson, J F; Wiseman, C; Xu, W; Yakushev, E; Young, A R; Yu, C -H; Zhitnikov, I

2015-01-01T23:59:59.000Z

423

AHF Booster Tracking with SIMPSONS.  

SciTech Connect

The booster lattice for the Advanced Hydrotest Facility at Los Alamos was tracked in 3-D with the program SIMPSONS, using the full, symplectic lattice from TEAPOT, using the full set of magnet and misalignment errors, as well as full space-charge effects. The only corrections included were a rough closed-orbit correction and chromaticity correction. The lattice was tracked for an entire booster cycle, from multi-turn injection through acceleration to the top energy of 4 GeV, approximately 99,000 turns. An initial injection intensity of 4x1Ol2, injected in 25 turns, resulted in a final intensity of 3 . 2 {approx} 1 0a' {approx}t 4 GeV. Results of the tracking, including emittance growth, particle loss, and particle tune distributions are presented.

Johnson, D. E. (David E.); Neri, F. (Filippo)

2002-01-01T23:59:59.000Z

424

Automatic heliostat track alignment method  

SciTech Connect

This patent describes a heliostat alignment method consisting of a number of steps. The first step consists of commanding a sunbeam centroid to a target location to establish a reference position. The next step searches for the actual sunbeam centroid position and determines the sunbeam centroid position error. These actions are followed by the analysis of the sunbeam centroid position error, correlating the sunbeam position error to errors in a heliostat reference system, and changing the heliostat reference system to correct for track misalignment in order to establish a revised heliostat reference system. The final step is changing the track alignment based on the revised heliostat reference system to a new position to correct the track misalignment.

Not Available

1986-01-14T23:59:59.000Z

425

The Majorana Parts Tracking Database  

E-Print Network (OSTI)

The Majorana Demonstrator is an ultra-low background physics experiment searching for the neutrinoless double beta decay of $^{76}$Ge. The Majorana Parts Tracking Database is used to record the history of components used in the construction of the Demonstrator. The tracking implementation takes a novel approach based on the schema-free database technology CouchDB. Transportation, storage, and processes undergone by parts such as machining or cleaning are linked to part records. Tracking parts provides a great logistics benefit and an important quality assurance reference during construction. In addition, the location history of parts provides an estimate of their exposure to cosmic radiation. A web application for data entry and a radiation exposure calculator have been developed as tools for achieving the extreme radio-purity required for this rare decay search.

The Majorana Collaboration; N. Abgrall; E. Aguayo; F. T. Avignone III; A. S. Barabash; F. E. Bertrand; V. Brudanin; M. Busch; D. Byram; A. S. Caldwell; Y-D. Chan; C. D. Christofferson; D. C. Combs; C. Cuesta; J. A. Detwiler; P. J. Doe; Yu. Efremenko; V. Egorov; H. Ejiri; S. R. Elliott; J. Esterline; J. E. Fast; P. Finnerty; F. M. Fraenkle; A. Galindo-Uribarri; G. K. Giovanetti; J. Goett; M. P. Green; J. Gruszko; V. E. Guiseppe; K. Gusev; A. L. Hallin; R. Hazama; A. Hegai; R. Henning; E. W. Hoppe; S. Howard; M. A. Howe; K. J. Keeter; M. F. Kidd; O. Kochetov; S. I. Konovalov; R. T. Kouzes; B. D. LaFerriere; J. Diaz Leon; L. E. Leviner; J. C. Loach; J. MacMullin; R. D. Martin; S. J. Meijer; S. Mertens; M. L. Miller; L. Mizouni; M. Nomachi; J. L. Orrell; C. O'Shaughnessy; N. R. Overman; R. Petersburg; D. G. Phillips II; A. W. P. Poon; K. Pushkin; D. C. Radford; J. Rager; K. Rielage; R. G. H. Robertson; E. Romero-Romero; M. C. Ronquest; B. Shanks; T. Shima; M. Shirchenko; K. J. Snavely; N. Snyder; A. Soin; A. M. Suriano; D. Tedeschi; J. Thompson; V. Timkin; W. Tornow; J. E. Trimble; R. L. Varner; S. Vasilyev; K. Vetter; K. Vorren; B. R. White; J. F. Wilkerson; C. Wiseman; W. Xu; E. Yakushev; A. R. Young; C. -H. Yu; V. Yumatov; I. Zhitnikov

2015-02-05T23:59:59.000Z

426

Exploring the WTI crude oil price bubble process using the Markov regime switching model  

Science Journals Connector (OSTI)

Abstract The sharp volatility of West Texas Intermediate (WTI) crude oil price in the past decade triggers us to investigate the price bubbles and their evolving process. Empirical results indicate that the fundamental price of WTI crude oil appears relatively more stable than that of the market-trading price, which verifies the existence of oil price bubbles during the sample period. Besides, by allowing the WTI crude oil price bubble process to switch between two states (regimes) according to a first-order Markov chain, we are able to statistically discriminate upheaval from stable states in the crude oil price bubble process; and in most of time, the stable state dominates the WTI crude oil price bubbles while the upheaval state usually proves short-lived and accompanies unexpected market events.

Yue-Jun Zhang; Jing Wang

2014-01-01T23:59:59.000Z

427

The stability of buoyant bubbles in the atmospheres of galaxy clusters  

E-Print Network (OSTI)

The buoyant rise of hot plasma bubbles inflated by AGN outflows in galaxy clusters can heat the cluster gas and thereby compensate radiative energy losses of this material. Numerical simulations of this effect often show the complete disruption of the bubbles followed by the mixing of the bubble material with the surrounding cluster gas due to fluid instabilities on the bubble surface. This prediction is inconsistent with the observations of apparently coherent bubble structures in clusters. We derive a general description in the linear regime of the growth of instabilities on the surface between two fluids under the influence of a gravitational field, viscosity, surface tension provided by a magnetic field and relative motion of the two fluids with respect to each other. We demonstrate that Kelvin-Helmholtz instabilities are always suppressed, if the fluids are viscous. They are also suppressed in the inviscid case for fluids of very different mass densities. We show that the effects of shear viscosity as we...

Kaiser, C R; Pope, E C D; Fangohr, H

2005-01-01T23:59:59.000Z

428

Chamber transport of ''foot'' pulses for heavy-ion fusion  

SciTech Connect

Indirect-drive targets for heavy-ion fusion must initially be heated by ''foot'' pulses that precede the main heating pulses by tens of nanoseconds. These pulses typically have a lower energy and perveance than the main pulses, and the fusion-chamber environment is different from that seen by later pulses. The preliminary particle-in-cell simulations of foot pulses here examine the sensitivity of the beam focusing to ion-beam perveance, background-gas density, and pre-neutralization by a plasma near the chamber entry port.

Sharp, W.M.; Callahan-Miller, D.A.; Tabak, M.; Yu, S.S.; Peterson, P.F.

2002-02-20T23:59:59.000Z

429

Dissipative expansion chambers with two concentric layers of fibrous material  

Science Journals Connector (OSTI)

The acoustic performance of a dissipative expansion chamber lined with two concentric, annular layers of fibrous material with different resistances is investigated. A two-dimensional analytical approach is used to determine the transmission loss of this dissipative silencer. From the boundary conditions at the rigid wall, and the interfaces between the fibre layers and the central airway, the characteristic function and thus eigenvalues and eigenfunctions for sound propagation in the dissipative chamber are obtained, leading to transmission loss through application of pressure and velocity matching. The effects of geometry and fibre properties on the acoustic attenuation are also discussed.

A. Selamet; M.B. Xu; I.J. Lee; N.T. Huff

2005-01-01T23:59:59.000Z

430

Measurements and Analysis of Oxygen Bubble Distributions in LiCl-KCl Molten Salt  

SciTech Connect

Transparent system experimental studies have been performed to provide measurement and analysis of oxygen bubble distributions and mass transfer coefficients at different sparging rates ranging from 0.05 to 0.20 L/min in LiCl-KCl molten salt at 500 degrees C using a high-speed digital camera and an oxygen sensor. The results reveal that bubble sizes and rise velocities increased with an increase in oxygen sparging rate. The bubbles observed were ellipsoidal in shape, and an equivalent diameter based on the ellipsoid volume was calculated. The average equivalent bubble diameters at 500 degrees C and these oxygen sparging rates range from 2.63 to 4.07 mm. Results show that the bubble equivalent diameters at each respective sparging rate are normally distributed. A Fanning friction factor correlation was produced to predict a bubbles rise velocity based on its equivalent diameter. The oxygen mass transfer coefficients for four sparging rates were calculated using the oxygenation model. These calculated values were within the order of magnitude of 10-2 cm/sec and followed a decreasing trend corresponding to an increasing bubble size and sparging rate. The diffusivities were calculated based on two different types of mechanisms, one based on physics of the bubbles and the other on systematic properties. The results reveal that diffusivity values calculated from bubble physics are 1.65 to 8.40 x 10-5 cm2/sec, which are within the range suggested by literature for gases in liquids of a similar viscosity.

Ryan W. Bezzant; Supathorn Phongikaroon; Michael F. Simpson

2013-03-01T23:59:59.000Z

431

A numerical study of mass transfer of ozone dissolution in bubble plumes with an Euler-Lagrange Method  

E-Print Network (OSTI)

, as a model problem for a water purification system. The effect of bubble diameter and plume structure on mass are widely observed and exploited in engineering applications, with water purification using ozone bubble the mass transfer process of ozone dissolution in a bubble plume inside a rectangular water tank

Huang, Huaxiong

432

Bubble growth in slightly supersaturated albite melt at constant pressure Don R. Baker a,*, Phyllis Lang b  

E-Print Network (OSTI)

Bubble growth in slightly supersaturated albite melt at constant pressure Don R. Baker a,*, Phyllis July 2005; accepted in revised form 11 January 2006 Abstract Bubble growth experiments were performed.5 or $1.5 wt.% H2O, respectively, which caused rapid exsolution and bubble growth. Results at 1200 °C

Long, Bernard

433

Bubble guidance of tubular growth in reactionprecipitation Stephanie Thouvenel-Romans, Jason J. Pagano and Oliver Steinbock*  

E-Print Network (OSTI)

Bubble guidance of tubular growth in reaction­precipitation systems Stephanie Thouvenel, the growth is templated and guided by single, buoyant gas bubbles. The resulting tubes can be several decimetres long and have constant radii in the range of 100­600 mm. Systematic measurements show that bubble

Steinbock, Oliver

434

Journal of the Applied Mathematics, Statistics and Informatics (JAMSI), 1 (2005), No. 2 Computer Animation: Animation of Soap Bubble  

E-Print Network (OSTI)

Animation: Animation of Soap Bubble Dynamics, Cluster Formation and Collision Roman Durikovic1 Abstract simulation of soap bubbles from a dynamic perspective, which should prove to be of great interest to physicists and mathematicians. We discuss the dynamic formation of irregular bubble clusters and how

Durikovic, Roman

435

Abstract P1-09-19: Demographic trends in clinical trial withdrawal rate within the bubble study  

Science Journals Connector (OSTI)

...clinical trial withdrawal rate within the bubble study EC Riley D Jain B Kantardzic X Wu SN...originally signed consent and enrolled in the Bubble Study but then withdrew at a later date. The Bubble Study is a non- blinded, prospective observational...

EC Riley; D Jain; B Kantardzic; X Wu; SN Rai

2013-12-15T23:59:59.000Z

436

Structure and energetics of He2* bubble-states in superfluid 4 J. Eloranta, N. Schwentner,a)  

E-Print Network (OSTI)

of the deep nodal well, ensuring the stability of the bare 3 d excimer in a large spherical bubbleStructure and energetics of He2* bubble-states in superfluid 4 He J. Eloranta, N. Schwentner bubble of 7 ? radius in which the excimer freely rotates. This explains the observed rotationally

Apkarian, V. Ara

437

Role of gas density in the stability of single-bubble sonoluminescence M.-C. Chu,2  

E-Print Network (OSTI)

Role of gas density in the stability of single-bubble sonoluminescence L. Yuan,1 C. Y. Ho,2 M bubbles can be unstable 9,10 . The remarkable stability of SBSL have been explained partially by several the regions in which stable SBSL may exist map out a stability threshold for the equi- librium bubble radius

Yuan, Li

438

Stability of bubbly liquids and its connection to the process of cavitation inception D. Fuster, K. Pham, and S. Zaleski  

E-Print Network (OSTI)

Stability of bubbly liquids and its connection to the process of cavitation inception D. Fuster, K.1063/1.1416497 Noise induced stabilization of chaotic oscillations of cavitation bubbles AIP Conf. Proc. 524, 519 (2000, 14 Apr 2014 16:11:36 #12;PHYSICS OF FLUIDS 26, 042002 (2014) Stability of bubbly liquids and its

Fuster, Daniel

439

Robotic vehicle with multiple tracked mobility platforms  

DOE Patents (OSTI)

A robotic vehicle having two or more tracked mobility platforms that are mechanically linked together with a two-dimensional coupling, thereby forming a composite vehicle of increased mobility. The robotic vehicle is operative in hazardous environments and can be capable of semi-submersible operation. The robotic vehicle is capable of remote controlled operation via radio frequency and/or fiber optic communication link to a remote operator control unit. The tracks have a plurality of track-edge scallop cut-outs that allow the tracks to easily grab onto and roll across railroad tracks, especially when crossing the railroad tracks at an oblique angle.

Salton, Jonathan R. (Albuquerque, NM); Buttz, James H. (Albuquerque, NM); Garretson, Justin (Albuquerque, NM); Hayward, David R. (Wetmore, CO); Hobart, Clinton G. (Albuquerque, NM); Deuel, Jr., Jamieson K. (Albuquerque, NM)

2012-07-24T23:59:59.000Z

440

Enhancements to System for Tracking Radioactive Waste Shipments...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

now track shipments of radioactive materials and access transportation information on mobile devices. Transportation Tracking and Communication System users can now track...

Note: This page contains sample records for the topic "bubble chamber tracks" 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

Corrective Action Tracking System (CATS) | Department of Energy  

NLE Websites -- All DOE Office Websites (Extended Search)

Action Tracking System (CATS) Corrective Action Tracking System (CATS) The CATS web-based database is used to enter, track, and report the status of corrective actions...

442

AGATA - Advanced Gamma Tracking Array  

E-Print Network (OSTI)

The Advanced GAmma Tracking Array (AGATA) is a European project to develop and operate the next generation gamma-ray spectrometer. AGATA is based on the technique of gamma-ray energy tracking in electrically segmented high-purity germanium crystals. This technique requires the accurate determination of the energy, time and position of every interaction as a gamma ray deposits its energy within the detector volume. Reconstruction of the full interaction path results in a detector with very high efficiency and excellent spectral response. The realization of gamma-ray tracking and AGATA is a result of many technical advances. These include the development of encapsulated highly-segmented germanium detectors assembled in a triple cluster detector cryostat, an electronics system with fast digital sampling and a data acquisition system to process the data at a high rate. The full characterization of the crystals was measured and compared with detector-response simulations. This enabled pulse-shape analysis algorithms, to extract energy, time and position, to be employed. In addition, tracking algorithms for event reconstruction were developed. The first phase of AGATA is now complete and operational in its first physics campaign. In the future AGATA will be moved between laboratories in Europe and operated in a series of campaigns to take advantage of the different beams and facilities available to maximize its science output. The paper reviews all the achievements made in the AGATA project including all the necessary infrastructure to operate and support the spectrometer.

S. Akkoyun; A. Algora; B. Alikhani; F. Ameil; G. de Angelis; L. Arnold; A. Astier; A. Ata; Y. Aubert; C. Aufranc; A. Austin; S. Aydin; F. Azaiez; S. Badoer; D. L. Balabanski; D. Barrientos; G. Baulieu; R. Baumann; D. Bazzacco; F. A. Beck; T. Beck; P. Bednarczyk; M. Bellato; M. A. Bentley; G. Benzoni; R. Berthier; L. Berti; R. Beunard; G. Lo Bianco; B. Birkenbach; P. G. Bizzeti; A. M. Bizzeti-Sona; F. Le Blanc; J. M. Blasco; N. Blasi; D. Bloor; C. Boiano; M. Borsato; D. Bortolato; A. J. Boston; H. C. Boston; P. Bourgault; P. Boutachkov; A. Bouty; A. Bracco; S. Brambilla; I. P. Brawn; A. Brondi; S. Broussard; B. Bruyneel; D. Bucurescu; I. Burrows; A. Brger; S. Cabaret; B. Cahan; E. Calore; F. Camera; A. Capsoni; F. Carri; G. Casati; M. Castoldi; B. Cederwall; J. -L. Cercus; V. Chambert; M. El Chambit; R. Chapman; L. Charles; J. Chavas; E. Clment; P. Cocconi; S. Coelli; P. J. Coleman-Smith; A. Colombo; S. Colosimo; C. Commeaux; D. Conventi; R. J. Cooper; A. Corsi; A. Cortesi; L. Costa; F. C. L. Crespi; J. R. Cresswell; D. M. Cullen; D. Curien; A. Czermak; D. Delbourg; R. Depalo; T. Descombes; P. Dsesquelles; P. Detistov; C. Diarra; F. Didierjean; M. R. Dimmock; Q. T. Doan; C. Domingo-Pardo; M. Doncel; F. Dorangeville; N. Dosme; Y. Drouen; G. Duchne; B. Dulny; J. Eberth; P. Edelbruck; J. Egea; T. Engert; M. N. Erduran; S. Ertrk; C. Fanin; S. Fantinel; E. Farnea; T. Faul; M. Filliger; F. Filmer; Ch. Finck; G. de France; A. Gadea; W. Gast; A. Geraci; J. Gerl; R. Gernhuser; A. Giannatiempo; A. Giaz; L. Gibelin; A. Givechev; N. Goel; V. Gonzlez; A. Gottardo; X. Grave; J. Gr?bosz; R. Griffiths; A. N. Grint; P. Gros; L. Guevara; M. Gulmini; A. Grgen; H. T. M. Ha; T. Habermann; L. J. Harkness; H. Harroch; K. Hauschild; C. He; A. Hernndez-Prieto; B. Hervieu; H. Hess; T. Hyk; E. Ince; R. Isocrate; G. Jaworski; A. Johnson; J. Jolie; P. Jones; B. Jonson; P. Joshi; D. S. Judson; A. Jungclaus; M. Kaci; N. Karkour; M. Karolak; A. Ka?ka?; M. Kebbiri; R. S. Kempley; A. Khaplanov; S. Klupp; M. Kogimtzis; I. Kojouharov; A. Korichi; W. Korten; Th. Krll; R. Krcken; N. Kurz; B. Y. Ky; M. Labiche; X. Lafay; L. Lavergne; I. H. Lazarus; S. Leboutelier; F. Lefebvre; E. Legay; L. Legeard; F. Lelli; S. M. Lenzi; S. Leoni; A. Lermitage; D. Lersch; J. Leske; S. C. Letts; S. Lhenoret; R. M. Lieder; D. Linget; J. Ljungvall; A. Lopez-Martens; A. Lotod; S. Lunardi; A. Maj; J. van der Marel; Y. Mariette; N. Marginean; R. Marginean; G. Maron; A. R. Mather; W. M?czy?ski; V. Mendz; P. Medina; B. Melon; R. Menegazzo; D. Mengoni; E. Merchan; L. Mihailescu; C. Michelagnoli; J. Mierzejewski; L. Milechina; B. Million; K. Mitev; P. Molini; D. Montanari; S. Moon; F. Morbiducci; R. Moro; P. S. Morrall; O. Mller; A. Nannini; D. R. Napoli; L. Nelson; M. Nespolo; V. L. Ngo; M. Nicoletto; R. Nicolini; Y. Le Noa; P. J. Nolan; M. Norman; J. Nyberg; A. Obertelli; A. Olariu; R. Orlandi; D. C. Oxley; C. zben; M. Ozille; C. Oziol; E. Pachoud; M. Palacz; J. Palin; J. Pancin; C. Parisel; P. Pariset; G. Pascovici; R. Peghin; L. Pellegri; A. Perego; S. Perrier; M. Petcu; P. Petkov; C. Petrache; E. Pierre; N. Pietralla; S. Pietri; M. Pignanelli; I. Piqueras; Z. Podolyak; P. Le Pouhalec; J. Pouthas; D. Pugnre; V. F. E. Pucknell; A. Pullia; B. Quintana; R. Raine; G. Rainovski; L. Ramina; G. Rampazzo; G. La Rana; M. Rebeschini; F. Recchia; N. Redon; M. Reese; P. Reiter; P. H. Regan; S. Riboldi; M. Richer; M. Rigato; S. Rigby; G. Ripamonti; A. P. Robinson; J. Robin; J. Roccaz; J. -A. Ropert; B. Ross; C. Rossi Alvarez; D. Rosso; B. Rubio; D. Rudolph; F. Saillant; E. ?ahin; F. Salomon; M. -D. Salsac; J. Salt; G. Salvato; J. Sampson; E. Sanchis; C. Santos; H. Schaffner; M. Schlarb; D. P. Scraggs; D. Seddon; M. ?enyi?it; M. -H. Sigward; G. Simpson; J. Simpson; M. Slee; J. F. Smith; P. Sona; B. Sowicki; P. Spolaore; C. Stahl; T. Stanios; E. Stefanova; O. Stzowski; J. Strachan; G. Suliman; P. -A. Sderstrm; J. L. Tain; S. Tanguy; S. Tashenov; Ch. Theisen; J. Thornhill; F. Tomasi; N. Toniolo; R. Touzery; B. Travers; A. Triossi; M. Tripon; K. M. M. Tun-Lano; M. Turcato; C. Unsworth; C. A. Ur; J. J. Valiente-Dobon; V. Vandone; E. Vardaci; R. Venturelli; F. Veronese; Ch. Veyssiere; E. Viscione; R. Wadsworth; P. M. Walker; N. Warr; C. Weber; D. Weisshaar; D. Wells; O. Wieland; A. Wiens; G. Wittwer; H. J. Wollersheim; F. Zocca; N. V. Zamfir; M. Zi?bli?ski; A. Zucchiatti

2011-11-24T23:59:59.000Z

443

Tracking Radioactive Sources in Commerce  

E-Print Network (OSTI)

Area Network­mobile phone, ethernet and/or satellite ? security--encryption, short broadcast bursts Randy Walker, Robert Abercrombie, Rocky Cline, Sabrina Phillips; Oak Ridge National Laboratory Frederick security by commercial shippers ? Knowledge of routes routinely taken ? Inability to track location

444

THE FERMI BUBBLES. II. THE POTENTIAL ROLES OF VISCOSITY AND COSMIC-RAY DIFFUSION IN JET MODELS  

SciTech Connect

The origin of the Fermi bubbles recently detected by the Fermi Gamma-ray Space Telescope in the inner Galaxy is mysterious. In the companion paper Guo and Mathews (Paper I), we use hydrodynamic simulations to show that they could be produced by a recent powerful active galactic nucleus (AGN) jet event. Here, we further explore this scenario to study the potential roles of shear viscosity and cosmic-ray (CR) diffusion on the morphology and CR distribution of the bubbles. We show that even a relatively low level of viscosity ({mu}{sub visc} {approx}> 3 g cm{sup -1} s{sup -1}, or {approx}0.1%-1% of Braginskii viscosity in this context) could effectively suppress the development of Kelvin-Helmholtz instabilities at the bubble surface, resulting in smooth bubble edges as observed. Furthermore, viscosity reduces circulating motions within the bubbles, which would otherwise mix the CR-carrying jet backflow near bubble edges with the bubble interior. Thus viscosity naturally produces an edge-favored CR distribution, an important ingredient to produce the observed flat gamma-ray surface brightness distribution. Generically, such a CR distribution often produces a limb-brightened gamma-ray intensity distribution. However, we show that by incorporating CR diffusion that is strongly suppressed across the bubble surface (as inferred from sharp bubble edges) but is close to canonical values in the bubble interior, we obtain a reasonably flat gamma-ray intensity profile. The similarity of the resulting CR bubble with the observed Fermi bubbles strengthens our previous result in Paper I that the Fermi bubbles were produced by a recent AGN jet event. Studies of the nearby Fermi bubbles may provide a unique opportunity to study the potential roles of plasma viscosity and CR diffusion on the evolution of AGN jets and bubbles.

Guo Fulai; Mathews, William G. [UCO/Lick Observatory, Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064 (United States); Dobler, Gregory [Kavli Institute for Theoretical Physics, University of California, Santa Barbara Kohn Hall, Santa Barbara, CA 93106 (United States); Oh, S. Peng, E-mail: fulai@ucolick.org [Department of Physics, University of California, Santa Barbara Kohn Hall, Santa Barbara, CA 93106 (United States)

2012-09-10T23:59:59.000Z

445

www.ornl.gov Environmental Chambers at ORNL  

E-Print Network (OSTI)

-air HVAC system, heat pump water heaters, a dehumidifying water heater, solid-state lighting, hybrid solar-by-side chambers can test gas heat pumps, electric heat pumps and air conditioners, gas/electric packaged units, desiccant systems, and small distributed generation/combined heat and power (CHP) systems with capacities

Oak Ridge National Laboratory

446

Hydrogen Production in a Single Chamber Microbial Electrolysis Cell  

E-Print Network (OSTI)

) at greater yields than fermentation and at greater energy efficiencies than water electrolysis. It has been to produce water. A microbial electrolysis cell (MEC) operates in a manner similar to an MFC exceptHydrogen Production in a Single Chamber Microbial Electrolysis Cell Lacking a Membrane D O U G L

447

Harvesting Energy from Wastewater in a 2-Chamber  

E-Print Network (OSTI)

Harvesting Energy from Wastewater in a 2-Chamber Microbial Fuel Cell Sikandar Present day wastewater treatment plants utilize high amounts of energy and are costly to operate. These conventional wastewater treatment plants utilize aerobic bacteria. Organic material in wastewater contains energy that can

448

Childhood Cancer Tracking Initiative in Massachusetts  

E-Print Network (OSTI)

Childhood Cancer Tracking Initiative in Massachusetts: Developing a New Electronic Tool Presented (CEH) Massachusetts Department of Public Health (MDPH) #12;Childhood Cancer Tracking Initiative "Develop methods for linking environmental databases with childhood cancer incidence data to identify

449

Tracking Discontinuous Motion Using Bayesian Inference  

Science Journals Connector (OSTI)

Robustly tracking people in visual scenes is an important task for surveillance, human-computer interfaces and visually mediated interaction. Existing attempts at tracking a persons head and hands deal with a...

Jamie Sherrah; 1]Shaogang Gong

2000-01-01T23:59:59.000Z

450

Floating Robots Track Water Flow With Smartphones  

NLE Websites -- All DOE Office Websites (Extended Search)

Floating Robots Track Water Flow, Stream Data via Smartphones Floating Robots Track Water Flow, Stream Data via Smartphones May 9, 2012 | Tags: Carver Jon Bashor, Jbashor@lbl.gov,...

451

Improving NCC-based direct visual tracking  

Science Journals Connector (OSTI)

Direct visual tracking can be impaired by changes in illumination if the right choice of similarity function and photometric model is not made. Tracking using the sum of squared differences, for instance, often needs to be coupled with a photometric ...

Glauco Garcia Scandaroli; Maxime Meilland; Rogrio Richa

2012-10-01T23:59:59.000Z

452

Why air bubbles in water glow so easily  

E-Print Network (OSTI)

Sound driven gas bubbles in water can emit light pulses (sonoluminescence). Experiments show a strong dependence on the type of gas dissolved in water. Air is found to be one of the most friendly gases towards this phenomenon. Recently, \\cite{loh96} have suggested a chemical mechanism to account for the strong dependence on the gas mixture: the dissociation of nitrogen at high temperatures and its subsequent chemical reactions to highly water soluble gases such as NO, NO$_2$, and/or NH$_3$. Here, we analyze the consequences of the theory and offer detailed comparison with the experimental data of Putterman's UCLA group. We can quantitatively account for heretofore unexplained results. In particular, we understand why the argon percentage in air is so essential for the observation of stable SL.

Michael Brenner; Sascha Hilgenfeldt; Detlef Lohse; ;

1996-08-09T23:59:59.000Z

453

Coalescence of bubbles and drops in an outer fluid  

E-Print Network (OSTI)

When two liquid drops touch, a microscopic connecting liquid bridge forms and rapidly grows as the two drops merge into one. Whereas coalescence has been thoroughly studied when drops coalesce in vacuum or air, many important situations involve coalescence in a dense surrounding fluid, such as oil coalescence in brine. Here we study the merging of gas bubbles and liquid drops in an external fluid. Our data indicate that the flows occur over much larger length scales in the outer fluid than inside the drops themselves. Thus we find that the asymptotic early regime is always dominated by the viscosity of the drops, independent of the external fluid. A phase diagram showing the crossovers into the different possible late-time dynamics identifies a dimensionless number that signifies when the external viscosity can be important.

Joseph D. Paulsen; Rmi Carmigniani; Anerudh Kannan; Justin C. Burton; Sidney R. Nagel

2014-07-24T23:59:59.000Z

454

Evidence for nuclear emissions during neutron seeded acoustic bubble cavitation  

Science Journals Connector (OSTI)

In cavitation experiments with deuterated acetone statistically significant tritium decay activity above background levels was detected. In addition evidence for statistically significant neutron emissions near 2.5 MeV was also observed as would be expected for deuteriumdeuterium fusion. Control experiments with normal acetone did not result in tritium activity or neutron emissions. Hydrodynamic shock code simulations supported the observed data and indicated compressed hot (106107 K) bubble implosion conditions as required for thermonuclear fusion reactions. Separate experiments with additional fluids are under way and results appear to support those observed with acetone. Scalability potential to higher yields as well as evidence for neutron?tritium branching ratios are presented.

2002-01-01T23:59:59.000Z

455

Single-Bubble Sonoluminescence as Dicke Superradiance at Finite Temperature  

E-Print Network (OSTI)

Sonoluminescence is a process in which a strong sound field is used to produce light in liquids. We explain sonoluminescence as a phase transition from ordinary fluorescence to a superradiant phase. We consider a spin-boson model composed of a single bosonic mode and an ensemble of $N$ identical two-level atoms. We assume that the whole system is in thermal equilibrium with a reservoir at temperature $\\beta^{-1}$. We show that, in a ultrastrong-coupling regime, between the two-level atoms and the electromagnetic field it is possible to have a cooperative interaction of the molecules of the gas in the interior of the bubble with the field, generating sonoluminescence.

M. Aparicio Alcalde; Hernando Quevedo; Nami Fux Svaiter

2014-08-18T23:59:59.000Z

456

Molecular Dynamics Simulation of Cascade-Induced Ballistic Helium Resolutioning from Bubbles in Iron  

SciTech Connect

Molecular dynamics simulations have been used to assess the ability of atomic displacement cascades to eject helium from small bubbles in iron. This study of the ballistic resolutioning mechanism employed a recently-developed Fe-He interatomic potential in concert with an iron potential developed by Ackland and co-workers. The primary variables examined were: irradiation temperature (100 and 600K), cascade energy (5 and 20 keV), bubble radius (0.5 and 1.0 nm), and He-to-vacancy ratio in the bubble (0.25, 0.5 and 1.0). Systematic trends were observed for each of these variables. For example, ballistic resolutioning leads to a greater number of helium atoms being displaced from larger bubbles and from bubbles that have a higher He/vacancy ratio (bubble pressure). He resolutioning was reduced at 600K relative to 100K, and for 20 keV cascades relative to 5 keV cascades. Overall, the results indicate a modest level of He removal by ballistic resolutioning. The results can be used to provide guidance in selection of a resolution parameter that can be employed in cluster dynamics models to predict the bubble size distribution that evolves under irradiation.

Stoller, Roger E [ORNL] [ORNL

2013-01-01T23:59:59.000Z

457

Cosmological consequences of slow-moving bubbles in first-order phase transitions  

Science Journals Connector (OSTI)

In cosmological first-order phase transitions, the progress of true-vacuum bubbles is expected to be significantly retarded by the interaction between the bubble wall and the hot plasma. We examine the evolution and collision of slow-moving true-vacuum bubbles. Our lattice simulations indicate that phase oscillations, predicted and observed in systems with a local symmetry and with a global symmetry where the bubbles move at speeds less than the speed of light, do not occur inside collisions of slow-moving local-symmetry bubbles. We observe almost instantaneous phase equilibration which would lead to a decrease in the expected initial defect density, or possibly prevent defects from forming at all. We illustrate our findings with an example of defect formation suppressed in slow-moving bubbles. Slow-moving bubble walls also prevent the formation of extra defects, and in the presence of plasma conductivity may lead to an increase in the magnitude of any primordial magnetic field formed.

Anne-Christine Davis and Matthew Lilley

2000-01-24T23:59:59.000Z

458

Inflation of small true vacuum bubble by quantization of Einstein-Hilbert action  

E-Print Network (OSTI)

We study the quantization of the Einstein-Hilbert action for a small true vacuum bubble without matter or scalar field. The quantization of action induces an extra term of potential called quantum potential in Hamilton-Jacobi equation, which gives expanding solutions including the exponential expansion solutions of the scalar factor $a$ for the bubble. We show that exponential expansion of the bubble continues with a short period (about a Planck time $t_p$), no matter whether the bubble is closed, flat or open. The exponential expansion ends spontaneously when the bubble becomes large, i.e., the scalar factor $a$ of the bubble approaches a Planck length $l_p$. We show that it is quantum potential of the small true vacuum bubble that plays the role of the scalar field potential suggested in the slow-roll inflation model. With the picture of quantum tunneling, we calculate particle creation rate during inflation, which shows that particles created by inflation have the capability of reheating the universe.

Dongshan He; Qing-yu Cai

2014-09-07T23:59:59.000Z

459

Inflation of small true vacuum bubble by quantization of Einstein-Hilbert action  

E-Print Network (OSTI)

We study the quantization of the Einstein-Hilbert action for a small true vacuum bubble without matter or scalar field. The quantization of action induces an extra term of potential called quantum potential in Hamilton-Jacobi equation, which gives expanding solutions including the exponential expansion solutions of the scalar factor $a$ for the bubble. We show that exponential expansion of the bubble continues with a short period (about a Planck time $t_p$), no matter whether the bubble is closed, flat or open. The exponential expansion ends spontaneously when the bubble becomes large, i.e., the scalar factor $a$ of the bubble approaches a Planck length $l_p$. We show that it is quantum potential of the small true vacuum bubble that plays the role of the scalar field potential suggested in the slow-roll inflation model. With the picture of quantum tunneling, we calculate particle creation rate during inflation, which shows that particles created by inflation have the capability of reheating the universe.

He, Dongshan

2014-01-01T23:59:59.000Z

460

Track 6: Integrating Safety Into Security Operations  

Energy.gov (U.S. Department of Energy (DOE))

ISM Workshop Presentations Knoxville Convention Center, Knoxville, TN August 2009 Track 6: Integrating Safety Into Security Operations

Note: This page contains sample records for the topic "bubble chamber tracks" 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

Track 5: Integration of Safety Into Design  

Energy.gov (U.S. Department of Energy (DOE))

ISM Workshop Presentations Knoxville Convention Center, Knoxville, TN August 2009 Track 5: Integration of Safety Into Design

462

THE FERMI BUBBLES AS A SCALED-UP VERSION OF SUPERNOVA REMNANTS  

SciTech Connect

In this study, we treat Fermi bubbles as a scaled-up version of supernova remnants (SNRs). The bubbles are created through activities of the super-massive black hole (SMBH) or starbursts at the Galactic center (GC). Cosmic-rays (CRs) are accelerated at the forward shocks of the bubbles like SNRs, which means that we cannot decide whether the bubbles were created by the SMBH or starbursts from the radiation from the CRs. We follow the evolution of CR distribution by solving a diffusion-advection equation, considering the reduction of the diffusion coefficient by CR streaming. In this model, gamma rays are created through hadronic interaction between CR protons and the gas in the Galactic halo. In the GeV band, we can well reproduce the observed flat distribution of gamma-ray surface brightness because some amount of gas is left behind the shock. The edge of the bubbles is fairly sharp owing to the high gas density behind the shock and the reduction of the diffusion coefficient there. The latter also contributes the hard gamma-ray spectrum of the bubbles. We find that the CR acceleration at the shock began when the bubbles were small, and the time scale of the energy injection at the GC was much smaller than the age of the bubbles. We predict that if CRs are accelerated to the TeV regime, the apparent bubble size should be larger in the TeV band, which could be used to discriminate our hadronic model from other leptonic models. We also present neutrino fluxes.

Fujita, Yutaka [Department of Earth and Space Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043 (Japan)] [Department of Earth and Space Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043 (Japan); Ohira, Yutaka; Yamazaki, Ryo, E-mail: fujita@vega.ess.sci.osaka-u.ac.jp [Department of Physics and Mathematics, Aoyama Gakuin University, Fuchinobe, Chuou-ku, Sagamihara 252-5258 (Japan)] [Department of Physics and Mathematics, Aoyama Gakuin University, Fuchinobe, Chuou-ku, Sagamihara 252-5258 (Japan)

2013-09-20T23:59:59.000Z

463

The stability of buoyant bubbles in the atmospheres of galaxy clusters  

E-Print Network (OSTI)

The buoyant rise of hot plasma bubbles inflated by AGN outflows in galaxy clusters can heat the cluster gas and thereby compensate radiative energy losses of this material. Numerical simulations of this effect often show the complete disruption of the bubbles followed by the mixing of the bubble material with the surrounding cluster gas due to fluid instabilities on the bubble surface. This prediction is inconsistent with the observations of apparently coherent bubble structures in clusters. We derive a general description in the linear regime of the growth of instabilities on the surface between two fluids under the influence of a gravitational field, viscosity, surface tension provided by a magnetic field and relative motion of the two fluids with respect to each other. We demonstrate that Kelvin-Helmholtz instabilities are always suppressed, if the fluids are viscous. They are also suppressed in the inviscid case for fluids of very different mass densities. We show that the effects of shear viscosity as well as a magnetic fields in the cluster gas can prevent the growth of Rayleigh-Taylor instabilities on relevant scale lengths. R-T instabilities on pc-scales are suppressed even if the kinematic viscosity of the cluster gas is reduced by two orders of magnitude compared to the value given by Spitzer for a fully ionised, unmagnetised gas. Similarly, magnetic fields exceeding a few microG result in an effective surface tension preventing the disruption of bubbles. For more massive clusters, instabilities on the bubble surface grow faster. This may explain the absence of thermal gas in the north-west bubble observed in the Perseus cluster compared to the apparently more disrupted bubbles in the Virgo cluster.

C. R. Kaiser; G. Pavlovski; E. C. D. Pope; H. Fangohr

2005-02-08T23:59:59.000Z

464

Rail ClipsRail Clips Track Renewal  

E-Print Network (OSTI)

Rail ClipsRail Clips and Track Renewal ver. 1 ME 6222: Manufacturing Processes and Systems Prof. J 2009 7 #12;Track Renewal ­ Tie replacement ballast packingTie replacement, ballast packing ME 6222: Manufacturing Processes and Systems Prof. J.S. Colton © GIT 2009 8 #12;Track Renewal ME 6222: Manufacturing

Colton, Jonathan S.

465

A study of flow patterns and dissolution kinetics in bubble columns  

SciTech Connect

Research objectives were to: study liquid and gas phase flow patterns in a bubble column reactor by comparing observations made with reported observations and hydrodynamic models; study mixing of two miscible liquid solutions with and without solid suspension in a bubble column reactor; study the kinetics of dissolution of a reactive solid phase suspended in the liquid phase in a bubble column reactor; and calculate mass transfer coefficients and apparent reaction rate from suitable mathematical models. Observations and conclusions are summarized in a series of viewgraphs.

Long, R.; Holbrook, S.; Chang, T. [New Mexico State Univ., Las Cruces, NM (United States). Dept. of Chemical Engineering

1997-11-01T23:59:59.000Z

466

Oxygen quenching in LAB based liquid scintillator and nitrogen bubbling model  

E-Print Network (OSTI)

The oxygen quenching effect in Linear Alkl Benzne (LAB) based liquid scintillator (LAB as the solvent, 3 g/L 2, 5 diphe-nyloxazole (PPO) as the fluor and 15 mg/L $p$-bis-($o$-methylstyryl)-benzene (bis-MSB) as the $\\lambda$-shifter) is studied by measuring the light yield as the function of the nitrogen bubbling time. It is shown that the light yield of the fully purged liquid scintillator is increased by 11% at the room temperature and the room atmosphere pressure. A simple nitrogen bubbling model is proposed to describe the relationship between the relative light yield (oxygen quenching factor) and the bubbling time.

Xiao Hua-Lin

2009-04-08T23:59:59.000Z

467

Train track expansions of measured foliations February 16, 2003  

E-Print Network (OSTI)

Train track expansions of measured foliations Lee Mosher February 16, 2003 Contents 1 Introduction foliations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 1.5 Train tracks and train track's classification of mapping classes . . . . . . . . . . . . . . 47 3 Train tracks 49 3.1 Pretracks

Mosher, Lee

468

Train track expansions of measured foliations December 28, 2003  

E-Print Network (OSTI)

Train track expansions of measured foliations Lee Mosher December 28, 2003 Contents 1 Introduction foliations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 1.5 Train tracks and train track's classification of mapping classes . . . . . . . . . . . . . . 53 3 Train tracks 55 3.1 Pretracks

Mosher, Lee

469

Plenary II -- Track Safety Standards  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

TSS 2001 A TSS 2001 A V 1.0 1 Federal Railroad Administration Track Safety Standards (TSS) 49 CFR Part 213 Subpart A - General Excepted Track & Classes 1 - 5 Overview TSS 2001 A V 1.0 2 Presentation Notes * This presentation is intended to provide guidance in broad terms. It is not intended to serve as a complete explanation of the regulations or as a substitute for application of the regulations to specific facts. * With the exception of definitions, each section shown in this presentation are brief summaries of the regulation text. User must consult the complete regulation documentation when necessary. * This presentation is based on the Final Rule published in the Federal Register June 22, 1998, Vol. 63, No. 119, [Docket RST-90-1, Notice 8] effective Sept. 21, 1998 and

470

Keeping track of the damage  

NLE Websites -- All DOE Office Websites (Extended Search)

News Archives: News Archives: 2012 | 2011 | 2010 | 2009 2008 | 2007 | 2006 | 2005 2004 | 2003 | 2002 | 2001 2000 Subscribe to APS News rss feed Keeping track of the damage Scientists resolve long-standing mystery of ion-solid interactions Reprinted with kind permission from ScienceWise - Science Magazine of the Australian National University JANUARY 27, 2009 Bookmark and Share Dr. Patrick Kluth and Claudia Schnohr. Silica (silicon dioxide) is the most abundant mineral in the earth's crust and consequently is a core component in many rocks. It's quite common for such rocks to also contain natural traces of materials like uranium that undergo slow radioactive decay. This radioactivity produces energetic particles that smash through the surrounding silica creating tracks of localized damage in their wake.

471

Single nanoparticle tracking spectroscopic microscope  

DOE Patents (OSTI)

A system that can maintain and track the position of a single nanoparticle in three dimensions for a prolonged period has been disclosed. The system allows for continuously imaging the particle to observe any interactions it may have. The system also enables the acquisition of real-time sequential spectroscopic information from the particle. The apparatus holds great promise in performing single molecule spectroscopy and imaging on a non-stationary target.

Yang, Haw (Moraga, CA); Cang, Hu (Berkeley, CA); Xu, Cangshan (Berkeley, CA); Wong, Chung M. (San Gabriel, CA)

2011-07-19T23:59:59.000Z

472

Development and test of combustion chamber for Stirling engine heated by natural gas  

Science Journals Connector (OSTI)

The combustion chamber is an important component for the Stirling engine heated by natural gas. In the paper ... , we develop a combustion chamber for the Stirling engine which aims to generate 3?5 kWe...electric...

Tie Li; Xiange Song; Xiaohong Gui; Dawei Tang; Zhigang Li

2014-04-01T23:59:59.000Z

473

At Solar System's Edge, There be...Bubbles? - NERSC Science News, June 9,  

NLE Websites -- All DOE Office Websites (Extended Search)

At Solar System's At Solar System's Edge, There be...Bubbles? At Solar System's Edge, There be...Bubbles? Voyagers, Computer Models Find Surprising Magnetic Froth June 9, 2011 | Tags: Astrophysics, Franklin, Fusion Energy, Fusion Energy Sciences (FES), Hopper Margie Wylie, mwylie@lbl.gov, +1 510 486 7421 This animated computer simulation shows how magnetic bubbles form at the edge of our solar system. It was created on NERSC's "Franklin" supercomputer using 8,192 processor cores simultaneously running for 20 hours. (Credit: James F. Drake) NASA's Voyager probes have reached the end of our solar system where they've found neither giants nor dragons, but something nearly as surprising-a turbulent froth of magnetic bubbles. Using new computer models to analyze Voyager data, scientists computing at

474

Bubbles Hot Spring Pool & Spa Low Temperature Geothermal Facility | Open  

Open Energy Info (EERE)

Bubbles Hot Spring Pool & Spa Low Temperature Geothermal Facility Bubbles Hot Spring Pool & Spa Low Temperature Geothermal Facility Jump to: navigation, search Name Bubbles Hot Spring Pool & Spa Low Temperature Geothermal Facility Facility Bubbles Hot Spring Sector Geothermal energy Type Pool and Spa Location Catron County, New Mexico Coordinates 34.1515173°, -108.4276047° 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":[]}

475

Design of Slurry Bubble Column Reactors: Novel Technique for Optimum Catalyst Size Selection  

NLE Websites -- All DOE Office Websites (Extended Search)

Slurry Bubble Column Reactors: Novel Technique Slurry Bubble Column Reactors: Novel Technique for Optimum Catalyst Size Selection Opportunity The Department of Energy's National Energy Technology Laboratory (NETL) is seeking licensing partners interested in implementing United States Patent Number 7,619,011 entitled "Design of Slurry Bubble Column Reactors: Novel Technique for Optimum Catalyst Size Selection." Disclosed in this patent is a method to determine the optimum catalyst particle size for application in a fluidized bed reactor, such as a slurry bubble column reactor (SBCR), to convert synthesis gas into liquid fuels. The reactor can be gas-solid, liquid- solid, or gas-liquid-solid. The method considers the complete granular temperature balance based on the kinetic theory of

476

Gas holdup in a gas-liquid-fiber semi-batch bubble column.  

E-Print Network (OSTI)

??A 4-m high, 15.24-cm diameter semi-batch bubble column connected to one of three perforated plate gas distributors with open area ratios A = 0.57%, 0.99%, (more)

Su, Xuefeng

2005-01-01T23:59:59.000Z

477

Graphene for reducing bubble defects and enhancing mechanical properties of graphene/cellulose acetate composite films  

Science Journals Connector (OSTI)

In this study, we have demonstrated a strategy by which graphene was used to reduce the bubble defects and enhance the mechanical properties in graphene/cellulose acetate (Gr/CA) composite films. Mono- and multil...

Lei Liu; Zhigang Shen; Shuaishuai Liang; Min Yi

2014-01-01T23:59:59.000Z

478

Bubble formation and Kr distribution in Kr-irradiated UO2  

SciTech Connect

In situ and ex situ transmission electron microscopy observation of small Kr bubbles in both single-crystal and polycrystalline UO2 were conducted to understand the inert gas bubble behavior in oxide nuclear fuel. The bubble size and volume swelling are shown as a weak function of ion dose but strongly depend on the temperature. The Kr bubble formation at room temperature was observed for the first time. The depth profiles of implanted Kr determined by atom probe tomography are in good agreement with the calculated profiles by SRIM, but the measured concentration of Kr is about 1/3 of calculated one. This difference is mainly due to low solubility of Kr in UO2 matrix, which has been confirmed by both density-functional theory calculations and chemical equilibrium analysis.

L.F. He; B. Valderrama; A.-R. Hassan; J. Yu; M. Gupta; J. Pakarinen; H.B. Henderson; J. Gan; M.A. Kirk; A.T. Nelson; M.V. Manuel; A. El-Azab; T.R. Allen

2015-01-01T23:59:59.000Z

479

A model on chemical looping combustion of methane in a bubbling fluidized-bed process  

Science Journals Connector (OSTI)

We developed a mathematical model to discuss the performance of chemical looping combustion (CLC) of methane in continuous bubbling ... The present model agrees reasonably well with the combustion efficiency meas...

Jeong-Hoo Choi; Pil Sang Youn; Djamila Brahimi

2012-06-01T23:59:59.000Z

480

iBubble: Multi-keyword Routing Protocol for Heterogeneous Wireless Sensor Networks  

E-Print Network (OSTI)

, Matt Spear, Karl Levitt and S. Felix Wu Department of Computer Science UC Davis, Davis, CA 95616 Email. By utilizing keywords, iBubble bridges many routing and energy problems prevalent in WSN, and provides a simple

California at Davis, University of

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


481

Soap films and soap bubbles: from Plateau to the olympic swimming pool in Beijing  

Science Journals Connector (OSTI)

It is very interesting to study the parallel story of soap bubbles and soap films in art and science. Noting that mathematicians in particular have been intrigued by their complex geometry, the author traces a...

Michele Emmer

2009-01-01T23:59:59.000Z

482

MagLab - Electrostatic Repulsion in Van de Graaff Bubbles Tutorial  

NLE Websites -- All DOE Office Websites (Extended Search)

Electrostatic Repulsion in Van de Graaff Bubbles This is a Java tutorial, which requires that you have Java, a free software, installed on your computer. It works best if you have...

483

Characterization of single and colliding laser-produced plasma bubbles using Thomson scattering and proton radiography  

E-Print Network (OSTI)

Time-resolved measurements of electron and ion temperatures using Thomson scattering have been combined with proton radiography data for comprehensive characterization of individual laser-produced plasma bubbles or the ...

Rosenberg, Michael Jonathan

484

Experimental study on bubble collapse phenomena in subcooled water with three-dimensional particle image velocimetry  

E-Print Network (OSTI)

The purpose of this study is to apply three-Micrographics. dimensional particle image velocimetry (PlV) technique to study bubble collapse phenomenon. Simultaneous stereoscopic views of the tracer-seeded flow were recorded by three charged couple...

Yang, Yu-Hsiang

2012-06-07T23:59:59.000Z

485

Measurements with an Automatically Recording Inverted Echo Sounder; ARIES and the Bubble Clouds  

Science Journals Connector (OSTI)

We report here analysis of the first observations with a new instrument, ARIES, designed to record the acoustic backscatter from bubble clouds at several levels below the surface of the ocean. The instrument is deployed on a subsurface mooring ...

S. A. Thorpe

1986-08-01T23:59:59.000Z

486

Direct Simulations of Homogeneous Bubble Nucleation: Agreement with CNT and no Local Hot Spots  

E-Print Network (OSTI)

We present results from direct, large-scale molecular dynamics (MD) simulations of homogeneous bubble (liquid-to-vapor) nucleation. The simulations contain half a billion Lennard-Jones (LJ) atoms and cover up to 56 million time-steps. The unprecedented size of the simulated volumes allows us to resolve the nucleation and growth of many bubbles per run in simple direct micro-canonical (NVE) simulations while the ambient pressure and temperature remain almost perfectly constant. We find bubble nucleation rates which are lower than in most of the previous, smaller simulations. It is widely believed that classical nucleation theory (CNT) generally underestimates bubble nucleation rates by very large factors. However, our measured rates are within two orders of magnitude of CNT predictions - only at very low temperatures does CNT underestimate the nucleation rate significantly. Introducing a small, positive Tolman length leads to very good agreement at all temperatures, as found in our recent vapor-to-liquid nucle...

Diemand, Jrg; Tanaka, Kyoko K; Tanaka, Hidekazu

2014-01-01T23:59:59.000Z

487

On the stability of gas bubbles in liquid-gas solutions  

Science Journals Connector (OSTI)

It was shown some time ago by use of diffusion theory that a gas bubble in a liquid-gas solution was unstable. ... papers both of which propose to develop a stability analysis solely from thermodynamic considerat...

Milton S. Plesset; Satwindar S. Sadhal

1982-01-01T23:59:59.000Z

488

A non-local free boundary problem arising in a theory of financial bubbles  

Science Journals Connector (OSTI)

...can be legitimately called a bubble. (d) Organization of the...viscosity solutions and the stability properties of these solutions...supersolutions is their stability: Proposition 2.2 (Stability of sub/supersolutions...

2014-01-01T23:59:59.000Z

489

On the stability of gas bubbles oscillating non-spherically in a compressible liquid  

Science Journals Connector (OSTI)

This paper describes the non-spherical free and forced oscillations of a gas bubble in a compressible liquid. Generally two different ... compressibility of the liquid and the gas. Stability and threshold conditi...

H. J. Rath

1981-07-01T23:59:59.000Z

490

Stability of a bubble in a dielectric liquid in an external electrostatic field  

Science Journals Connector (OSTI)

Critical instability conditions are found for a gas bubble in a liquid dielectric in a uniform external electrostatic field E 0. It is shown that they depend both on the magnitude of E ...

A. I. Grigorev; A. N. Zharov; S. O. Shiryaeva

1999-08-01T23:59:59.000Z

491

Stability of a charged bubble in a dielectric liquid against radial perturbations  

Science Journals Connector (OSTI)

It is shown that the critical conditions for instability of a charged vapor-gas bubble in a dielectric liquid against virtual radially symmetric volume perturbations are substantially less stringent than the c...

A. I. Grigorev

1999-01-01T23:59:59.000Z

492

Formation of seep bubble plumes in the Coal Oil Point seep field  

E-Print Network (OSTI)

hydrocarbon seeps near Coal Oil Point, California. Marof seep bubble plumes in the Coal Oil Point seep field Irameasurement system in the Coal Oil Point seep field in the

Leifer, Ira; Culling, Daniel

2010-01-01T23:59:59.000Z

493

Beam Loss Ion Chamber System Upgrade for Experimental Halls  

SciTech Connect

The Beam loss Ion Chamber System (BLICS) was developed to protect Jefferson Labs transport lines, targets and beam dumps from a catastrophic ''burn through''. Range changes and testing was accomplished manually requiring the experiment to be shut down. The new upgraded system is based around an ''off the shelf'' Programmable Logic Controller located in a single control box supporting up to ten individual detectors. All functions that formerly required an entry into the experimental hall and manual adjustment can be accomplished from the Machine Control Center (MCC). A further innovation was the addition of a High Voltage ''Brick'' at the detector location. A single cable supplies the required voltage for the Brick and a return line for the ion chamber signal. The read back screens display range, trip point, and accumulated dose for each location. The new system is very cost effective and significantly reduces the amount of lost experimental time.

D.W. Dotson; D.J. Seidman

2005-05-16T23:59:59.000Z

494

Radiopurity assessment of the tracking readout for the NEXT double beta decay experiment  

E-Print Network (OSTI)

The 'Neutrino Experiment with a Xenon Time-Projection Chamber' (NEXT) is intended to investigate the neutrinoless double beta decay of 136Xe, which requires a severe suppression of potential backgrounds; therefore, an extensive screening and selection process is underway to control the radiopurity levels of the materials to be used in the experimental set-up of NEXT. The detector design combines the measurement of the topological signature of the event for background discrimination with the energy resolution optimization. Separate energy and tracking readout planes are based on different sensors: photomultiplier tubes for calorimetry and silicon multi-pixel photon counters for tracking. The design of a radiopure tracking plane, in direct contact with the gas detector medium, was a challenge since the needed components have typically activities too large for experiments requiring ultra-low background conditions. Here, the radiopurity assessment of tracking readout components based on gamma-ray spectroscopy using ultra-low background germanium detectors at the Laboratorio Subterraneo de Canfranc (Spain) is described. According to the obtained results, radiopure enough printed circuit boards made of kapton and copper and silicon photomultipliers, fulfilling the requirements of an overall background level in that region of at most 8 x 10-4 counts keV-1 kg-1 y-1, have been identified.

V. lvarez; I. Bandac; A. I. Barrado; A. Bettini; F. I. G. M. Borges; M. Camargo; S. Crcel; S. Cebrin; A. Cervera; C. A. N. Conde; E. Conde; T. Dafni; J. Daz; R. Esteve; L. M. P. Fernandes; M. Fernndez; P. Ferrario; A. L. Ferreira; E. D. C. Freitas; V. M. Gehman; A. Goldschmidt; H. Gmez; J. J. Gmez-Cadenas; D. Gonzlez-Daz; R. M. Gutirrez; J. Hauptman; J. A. Hernando Morata; D. C. Herrera; F. J. Iguaz; I. G. Irastorza; L. Labarga; A. Laing; I. Liubarsky; D. Lorca; M. Losada; G. Luzn; A. Mar; J. Martn-Albo; A. Martnez; G. Martnez-Lema; T. Miller; F. Monrabal; M. Monserrate; C. M. B. Monteiro; F. J. Mora; L. M. Moutinho; J. Muoz Vidal; M. Nebot-Guinot; D. Nygren; C. A. B. Oliveira; A. Ortiz de Solrzano; J. Prez; J. L. Prez Aparicio; J. Renner; L. Ripoll; A. Rodrguez; J. Rodrguez; F. P. Santos; J. M. F. dos Santos; L. Segui; L. Serra; D. Shuman; A. Simn; C. Sofka; M. Sorel; J. F. Toledo; J. Torrent; Z. Tsamalaidze; J. F. C. A. Veloso; J. A. Villar; R. C. Webb; J. T. White; N. Yahlali

2014-11-05T23:59:59.000Z

495

Development and characterization of a chamber gram estimator  

SciTech Connect

The Chamber Gram Estimator (CGE), Model SAM-1B is a small article gamma monitor originally designed to screen items for radioactive contamination that may be placed into its chamber. Four plastic scintillator detectors detect photons emitted from bulk quantities of fissile materials in line generated waste and provide a fissile mass content estimate of waste packages. With the present CGE, a few grams of {sup 239}Pu could be distinguished above background in light matrix samples. It is controlled by a personal computer that uses a menu driven operating program. The program is designed to reduce the potential for operator error while obtaining a fissile material gram estimate of a line generated waste package prior to placement in a drum. This report describes the work performed to characterize the counting chamber for fissile material estimation. The operating features of the CGE, the results and conclusions drawn from the experiments, and the future work recommended for the next generation CGEs are also described. The CGE provides advantages over hand-held Ludlum 12-12 survey-type instruments presently in use. The CGE is easy to operate, does not require manual manipulation to measure the total surf ace of the sample, and provides a display free of rate meter response-time effects or the need for visual averaging. Moreover, the response variations due to sample geometry are significantly less than with a hand-held arrangement, particularly, for the low density matrix samples appropriate for estimation. The waste packages are placed inside the instrument`s shielded chamber which effectively eliminates gamma exposure to operators from waste packages.

Dulco, G.B.; Gupta, V.P.; Balmer, D.K.

1995-07-01T23:59:59.000Z

496

Using sputter coated glass to stabilize microstrip gas chambers  

DOE Patents (OSTI)

By sputter coating a thin-layer of low-resistive, electronically-conductive glass on various substrates (including quartz and ceramics, thin-film Pestov glass), microstrip gas chambers (MSGC) of high gain stability, low leakage current, and a high rate capability can be fabricated. This design can make the choice of substrate less important, save the cost of ion-implantation, and use less glass material.

Gong, Wen G. (Albany, CA)

1997-01-01T23:59:59.000Z

497

CLOUD CHAMBER: A PERFORMANCE INVOLVING REAL TIME TWO-WAY INTERACTION BETWEEN SUBATOMIC RADIOACTIVE  

E-Print Network (OSTI)

will be placed in the chamber on stage, saturated with ethanol and cooled by liquid nitrogen, which makes

Miranda, Eduardo Reck

498

Experiment and Numerical Simulation of Bubble Behaviors in Argon Gas Injection Into Lead-Bismuth Pool  

SciTech Connect

In a lead-bismuth alloy (45%Pb-55%Bi) cooled direct contact boiling water fast reactor (PBWFR), steam can be produced by direct contact of feed water with primary Pb-Bi coolant in the upper core plenum, and Pb-Bi coolant can be circulated by buoyancy forces of steam bubbles. As a basic study to investigate the two-phase flow characteristics in the chimneys of PBWFR, a two-dimensional two-phase flow was simulated by injecting argon gas into Pb-Bi pool in a rectangular vessel (400 mm in length, 1500 mm in height, 50 mm in width), and bubble behaviors were investigated experimentally. Bubble sizes, bubble rising velocities and void fractions were measured using void probes. Argon gas was injected through five nozzles of 4 mm in diameter into Pb-Bi at two locations. The experimental conditions are the pressure of atmospheric pressure, Pb-Bi temperatures of 443 K, and the flow rate of injection Ar gas is 10, 20, and 30 NL/min. The measured bubble rising velocities were distributed in the range from 1 to 3 m/s. The average velocity was about 0.6 m/s. The measured bubble chord lengths were distributed from 1 mm up to 30 mm. The average chord length was about 7 mm. An analysis was performed by two-dimensional and two-fluid model. The experimental results were compared with the analytical results to evaluate the validity of the analytical model. Although large diameter bubbles were observed in the experiment, the drag force model for spherical bubbles performed better for simulation of the experimental result because of high surface tension force of Pb-Bi. (authors)

Yumi Yamada [Advanced Reactor Technology Company, Ltd. (Japan); Toyou Akashi; Minoru Takahashi [Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550 (Japan)

2006-07-01T23:59:59.000Z

499

Analytical solutions of the Rayleigh equation for empty and gas--filled bubble  

E-Print Network (OSTI)

The Rayleigh equation for bubble dynamics is widely used. However, analytical solutions of this equation have not been obtained previously. Here we find closed--form general solutions of the Rayleigh equation both for an empty and gas--filled spherical bubble. We present an approach allowing us to construct exact solutions of the Rayleigh equation. We show that our solutions are useful for testing numerical algorithms.

Kudryashov, Nikolay A

2014-01-01T23:59:59.000Z

500

Cavity resonances in engine combustion chambers and some applications  

Science Journals Connector (OSTI)

Cavity resonances in engine cylinders are caused by combustion events such as the rapid rate of pressure rise that occurs during compression ignition in diesels or from knock in gasoline engines. These resonances generally occur at frequencies greater than 4 to 5 kHz where the engine structure is not an efficient acoustical radiator. However when they occur at lower frequencies such as in engines with a large bore or in indirect injection diesels they can be important in the noise generation process. They are also important for knock detection in gasoline engines. Current knock detection systems are tuned to the frequency band of the lowest cavity resonance in the combustion chamber. It is shown in the paper that higher order resonances can also be detected by a knock vibration sensor on the surface of the engine. Another use for the cavity resonances is to determine the bulk temperature of the gas in the combustion chamber as a function of crank angle. This technique is demonstrated in the paper for a heavy?duty two?stroke diesel. Also the results of several fundamental investigations of cavity resonances in engine combustion chambers are reported briefly. Good agreement is obtained between theoretical prediction of the resonant frequencies and experimental observation. The splitting of degenerate modes into two components is discussed.

Robert Hickling; Douglas A. Feldmaier; Francis H. K. Chen; Josette S. Morel

1983-01-01T23:59:59.000Z